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authorDan Williams <dan.j.williams@intel.com>2009-09-09 00:55:21 (GMT)
committerDan Williams <dan.j.williams@intel.com>2009-09-09 00:55:21 (GMT)
commitbbb20089a3275a19e475dbc21320c3742e3ca423 (patch)
tree216fdc1cbef450ca688135c5b8969169482d9a48 /drivers/md
parent3e48e656903e9fd8bc805c6a2c4264d7808d315b (diff)
parent657a77fa7284d8ae28dfa48f1dc5d919bf5b2843 (diff)
downloadlinux-bbb20089a3275a19e475dbc21320c3742e3ca423.tar.xz
Merge branch 'dmaengine' into async-tx-next
Conflicts: crypto/async_tx/async_xor.c drivers/dma/ioat/dma_v2.h drivers/dma/ioat/pci.c drivers/md/raid5.c
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/Kconfig30
-rw-r--r--drivers/md/Makefile5
-rw-r--r--drivers/md/bitmap.c4
-rw-r--r--drivers/md/dm-crypt.c19
-rw-r--r--drivers/md/dm-delay.c26
-rw-r--r--drivers/md/dm-exception-store.c4
-rw-r--r--drivers/md/dm-exception-store.h4
-rw-r--r--drivers/md/dm-io.c14
-rw-r--r--drivers/md/dm-ioctl.c28
-rw-r--r--drivers/md/dm-linear.c15
-rw-r--r--drivers/md/dm-log-userspace-base.c696
-rw-r--r--drivers/md/dm-log-userspace-transfer.c276
-rw-r--r--drivers/md/dm-log-userspace-transfer.h18
-rw-r--r--drivers/md/dm-log.c8
-rw-r--r--drivers/md/dm-mpath.c334
-rw-r--r--drivers/md/dm-path-selector.h8
-rw-r--r--drivers/md/dm-queue-length.c263
-rw-r--r--drivers/md/dm-raid1.c17
-rw-r--r--drivers/md/dm-region-hash.c2
-rw-r--r--drivers/md/dm-round-robin.c2
-rw-r--r--drivers/md/dm-service-time.c339
-rw-r--r--drivers/md/dm-snap-persistent.c4
-rw-r--r--drivers/md/dm-snap.c11
-rw-r--r--drivers/md/dm-stripe.c33
-rw-r--r--drivers/md/dm-sysfs.c9
-rw-r--r--drivers/md/dm-table.c463
-rw-r--r--drivers/md/dm.c1142
-rw-r--r--drivers/md/dm.h35
-rw-r--r--drivers/md/faulty.c21
-rw-r--r--drivers/md/linear.c220
-rw-r--r--drivers/md/linear.h12
-rw-r--r--drivers/md/md.c198
-rw-r--r--drivers/md/md.h14
-rw-r--r--drivers/md/multipath.c27
-rw-r--r--drivers/md/multipath.h6
-rw-r--r--drivers/md/raid0.c405
-rw-r--r--drivers/md/raid0.h10
-rw-r--r--drivers/md/raid1.c50
-rw-r--r--drivers/md/raid1.h6
-rw-r--r--drivers/md/raid10.c70
-rw-r--r--drivers/md/raid10.h6
-rw-r--r--drivers/md/raid5.c223
-rw-r--r--drivers/md/raid5.h8
43 files changed, 3987 insertions, 1098 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 09c0c6e..2158377 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -257,6 +257,17 @@ config DM_MIRROR
Allow volume managers to mirror logical volumes, also
needed for live data migration tools such as 'pvmove'.
+config DM_LOG_USERSPACE
+ tristate "Mirror userspace logging (EXPERIMENTAL)"
+ depends on DM_MIRROR && EXPERIMENTAL && NET
+ select CONNECTOR
+ ---help---
+ The userspace logging module provides a mechanism for
+ relaying the dm-dirty-log API to userspace. Log designs
+ which are more suited to userspace implementation (e.g.
+ shared storage logs) or experimental logs can be implemented
+ by leveraging this framework.
+
config DM_ZERO
tristate "Zero target"
depends on BLK_DEV_DM
@@ -275,6 +286,25 @@ config DM_MULTIPATH
---help---
Allow volume managers to support multipath hardware.
+config DM_MULTIPATH_QL
+ tristate "I/O Path Selector based on the number of in-flight I/Os"
+ depends on DM_MULTIPATH
+ ---help---
+ This path selector is a dynamic load balancer which selects
+ the path with the least number of in-flight I/Os.
+
+ If unsure, say N.
+
+config DM_MULTIPATH_ST
+ tristate "I/O Path Selector based on the service time"
+ depends on DM_MULTIPATH
+ ---help---
+ This path selector is a dynamic load balancer which selects
+ the path expected to complete the incoming I/O in the shortest
+ time.
+
+ If unsure, say N.
+
config DM_DELAY
tristate "I/O delaying target (EXPERIMENTAL)"
depends on BLK_DEV_DM && EXPERIMENTAL
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index 45cc595..1dc4185 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -8,6 +8,8 @@ dm-multipath-y += dm-path-selector.o dm-mpath.o
dm-snapshot-y += dm-snap.o dm-exception-store.o dm-snap-transient.o \
dm-snap-persistent.o
dm-mirror-y += dm-raid1.o
+dm-log-userspace-y \
+ += dm-log-userspace-base.o dm-log-userspace-transfer.o
md-mod-y += md.o bitmap.o
raid456-y += raid5.o
raid6_pq-y += raid6algos.o raid6recov.o raid6tables.o \
@@ -36,8 +38,11 @@ obj-$(CONFIG_BLK_DEV_DM) += dm-mod.o
obj-$(CONFIG_DM_CRYPT) += dm-crypt.o
obj-$(CONFIG_DM_DELAY) += dm-delay.o
obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o
+obj-$(CONFIG_DM_MULTIPATH_QL) += dm-queue-length.o
+obj-$(CONFIG_DM_MULTIPATH_ST) += dm-service-time.o
obj-$(CONFIG_DM_SNAPSHOT) += dm-snapshot.o
obj-$(CONFIG_DM_MIRROR) += dm-mirror.o dm-log.o dm-region-hash.o
+obj-$(CONFIG_DM_LOG_USERSPACE) += dm-log-userspace.o
obj-$(CONFIG_DM_ZERO) += dm-zero.o
quiet_cmd_unroll = UNROLL $@
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 56df1ce..3319c2f 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -232,7 +232,7 @@ static struct page *read_sb_page(mddev_t *mddev, long offset,
target = rdev->sb_start + offset + index * (PAGE_SIZE/512);
if (sync_page_io(rdev->bdev, target,
- roundup(size, bdev_hardsect_size(rdev->bdev)),
+ roundup(size, bdev_logical_block_size(rdev->bdev)),
page, READ)) {
page->index = index;
attach_page_buffers(page, NULL); /* so that free_buffer will
@@ -287,7 +287,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
int size = PAGE_SIZE;
if (page->index == bitmap->file_pages-1)
size = roundup(bitmap->last_page_size,
- bdev_hardsect_size(rdev->bdev));
+ bdev_logical_block_size(rdev->bdev));
/* Just make sure we aren't corrupting data or
* metadata
*/
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 53394e8..9933eb8 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1132,6 +1132,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad_crypt_queue;
}
+ ti->num_flush_requests = 1;
ti->private = cc;
return 0;
@@ -1189,6 +1190,13 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
struct dm_crypt_io *io;
+ struct crypt_config *cc;
+
+ if (unlikely(bio_empty_barrier(bio))) {
+ cc = ti->private;
+ bio->bi_bdev = cc->dev->bdev;
+ return DM_MAPIO_REMAPPED;
+ }
io = crypt_io_alloc(ti, bio, bio->bi_sector - ti->begin);
@@ -1305,9 +1313,17 @@ static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
}
+static int crypt_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct crypt_config *cc = ti->private;
+
+ return fn(ti, cc->dev, cc->start, data);
+}
+
static struct target_type crypt_target = {
.name = "crypt",
- .version= {1, 6, 0},
+ .version = {1, 7, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,
@@ -1318,6 +1334,7 @@ static struct target_type crypt_target = {
.resume = crypt_resume,
.message = crypt_message,
.merge = crypt_merge,
+ .iterate_devices = crypt_iterate_devices,
};
static int __init dm_crypt_init(void)
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 559dbb5..4e5b843 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -197,6 +197,7 @@ out:
mutex_init(&dc->timer_lock);
atomic_set(&dc->may_delay, 1);
+ ti->num_flush_requests = 1;
ti->private = dc;
return 0;
@@ -278,8 +279,9 @@ static int delay_map(struct dm_target *ti, struct bio *bio,
if ((bio_data_dir(bio) == WRITE) && (dc->dev_write)) {
bio->bi_bdev = dc->dev_write->bdev;
- bio->bi_sector = dc->start_write +
- (bio->bi_sector - ti->begin);
+ if (bio_sectors(bio))
+ bio->bi_sector = dc->start_write +
+ (bio->bi_sector - ti->begin);
return delay_bio(dc, dc->write_delay, bio);
}
@@ -316,9 +318,26 @@ static int delay_status(struct dm_target *ti, status_type_t type,
return 0;
}
+static int delay_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct delay_c *dc = ti->private;
+ int ret = 0;
+
+ ret = fn(ti, dc->dev_read, dc->start_read, data);
+ if (ret)
+ goto out;
+
+ if (dc->dev_write)
+ ret = fn(ti, dc->dev_write, dc->start_write, data);
+
+out:
+ return ret;
+}
+
static struct target_type delay_target = {
.name = "delay",
- .version = {1, 0, 2},
+ .version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = delay_ctr,
.dtr = delay_dtr,
@@ -326,6 +345,7 @@ static struct target_type delay_target = {
.presuspend = delay_presuspend,
.resume = delay_resume,
.status = delay_status,
+ .iterate_devices = delay_iterate_devices,
};
static int __init dm_delay_init(void)
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index a2e26c2..c3ae515 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -178,7 +178,7 @@ static int set_chunk_size(struct dm_exception_store *store,
}
/* Validate the chunk size against the device block size */
- if (chunk_size_ulong % (bdev_hardsect_size(store->cow->bdev) >> 9)) {
+ if (chunk_size_ulong % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
*error = "Chunk size is not a multiple of device blocksize";
return -EINVAL;
}
@@ -216,7 +216,7 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
return -EINVAL;
}
- type = get_type(argv[1]);
+ type = get_type(&persistent);
if (!type) {
ti->error = "Exception store type not recognised";
r = -EINVAL;
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 0a2e6e7..2442c8c 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -111,7 +111,7 @@ struct dm_exception_store {
/*
* Funtions to manipulate consecutive chunks
*/
-# if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
+# if defined(CONFIG_LBDAF) || (BITS_PER_LONG == 64)
# define DM_CHUNK_CONSECUTIVE_BITS 8
# define DM_CHUNK_NUMBER_BITS 56
@@ -156,7 +156,7 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_snap_exception *e)
*/
static inline sector_t get_dev_size(struct block_device *bdev)
{
- return bdev->bd_inode->i_size >> SECTOR_SHIFT;
+ return i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
}
static inline chunk_t sector_to_chunk(struct dm_exception_store *store,
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index e73aabd..3a2e6a2 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -22,6 +22,7 @@ struct dm_io_client {
/* FIXME: can we shrink this ? */
struct io {
unsigned long error_bits;
+ unsigned long eopnotsupp_bits;
atomic_t count;
struct task_struct *sleeper;
struct dm_io_client *client;
@@ -107,8 +108,11 @@ static inline unsigned bio_get_region(struct bio *bio)
*---------------------------------------------------------------*/
static void dec_count(struct io *io, unsigned int region, int error)
{
- if (error)
+ if (error) {
set_bit(region, &io->error_bits);
+ if (error == -EOPNOTSUPP)
+ set_bit(region, &io->eopnotsupp_bits);
+ }
if (atomic_dec_and_test(&io->count)) {
if (io->sleeper)
@@ -360,7 +364,9 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
return -EIO;
}
+retry:
io.error_bits = 0;
+ io.eopnotsupp_bits = 0;
atomic_set(&io.count, 1); /* see dispatch_io() */
io.sleeper = current;
io.client = client;
@@ -377,6 +383,11 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
}
set_current_state(TASK_RUNNING);
+ if (io.eopnotsupp_bits && (rw & (1 << BIO_RW_BARRIER))) {
+ rw &= ~(1 << BIO_RW_BARRIER);
+ goto retry;
+ }
+
if (error_bits)
*error_bits = io.error_bits;
@@ -397,6 +408,7 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
io = mempool_alloc(client->pool, GFP_NOIO);
io->error_bits = 0;
+ io->eopnotsupp_bits = 0;
atomic_set(&io->count, 1); /* see dispatch_io() */
io->sleeper = NULL;
io->client = client;
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 823ceba..7f77f18 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -276,7 +276,7 @@ retry:
up_write(&_hash_lock);
}
-static int dm_hash_rename(const char *old, const char *new)
+static int dm_hash_rename(uint32_t cookie, const char *old, const char *new)
{
char *new_name, *old_name;
struct hash_cell *hc;
@@ -333,7 +333,7 @@ static int dm_hash_rename(const char *old, const char *new)
dm_table_put(table);
}
- dm_kobject_uevent(hc->md);
+ dm_kobject_uevent(hc->md, KOBJ_CHANGE, cookie);
dm_put(hc->md);
up_write(&_hash_lock);
@@ -680,6 +680,9 @@ static int dev_remove(struct dm_ioctl *param, size_t param_size)
__hash_remove(hc);
up_write(&_hash_lock);
+
+ dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr);
+
dm_put(md);
param->data_size = 0;
return 0;
@@ -715,7 +718,7 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size)
return r;
param->data_size = 0;
- return dm_hash_rename(param->name, new_name);
+ return dm_hash_rename(param->event_nr, param->name, new_name);
}
static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
@@ -842,8 +845,11 @@ static int do_resume(struct dm_ioctl *param)
if (dm_suspended(md))
r = dm_resume(md);
- if (!r)
+
+ if (!r) {
+ dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr);
r = __dev_status(md, param);
+ }
dm_put(md);
return r;
@@ -1044,6 +1050,12 @@ static int populate_table(struct dm_table *table,
next = spec->next;
}
+ r = dm_table_set_type(table);
+ if (r) {
+ DMWARN("unable to set table type");
+ return r;
+ }
+
return dm_table_complete(table);
}
@@ -1089,6 +1101,13 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
goto out;
}
+ r = dm_table_alloc_md_mempools(t);
+ if (r) {
+ DMWARN("unable to allocate mempools for this table");
+ dm_table_destroy(t);
+ goto out;
+ }
+
down_write(&_hash_lock);
hc = dm_get_mdptr(md);
if (!hc || hc->md != md) {
@@ -1513,6 +1532,7 @@ static const struct file_operations _ctl_fops = {
static struct miscdevice _dm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DM_NAME,
+ .devnode = "mapper/control",
.fops = &_ctl_fops
};
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 79fb53e..9184b6de 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -53,6 +53,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto bad;
}
+ ti->num_flush_requests = 1;
ti->private = lc;
return 0;
@@ -81,7 +82,8 @@ static void linear_map_bio(struct dm_target *ti, struct bio *bio)
struct linear_c *lc = ti->private;
bio->bi_bdev = lc->dev->bdev;
- bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
+ if (bio_sectors(bio))
+ bio->bi_sector = linear_map_sector(ti, bio->bi_sector);
}
static int linear_map(struct dm_target *ti, struct bio *bio,
@@ -132,9 +134,17 @@ static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
}
+static int linear_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct linear_c *lc = ti->private;
+
+ return fn(ti, lc->dev, lc->start, data);
+}
+
static struct target_type linear_target = {
.name = "linear",
- .version= {1, 0, 3},
+ .version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = linear_ctr,
.dtr = linear_dtr,
@@ -142,6 +152,7 @@ static struct target_type linear_target = {
.status = linear_status,
.ioctl = linear_ioctl,
.merge = linear_merge,
+ .iterate_devices = linear_iterate_devices,
};
int __init dm_linear_init(void)
diff --git a/drivers/md/dm-log-userspace-base.c b/drivers/md/dm-log-userspace-base.c
new file mode 100644
index 0000000..e69b965
--- /dev/null
+++ b/drivers/md/dm-log-userspace-base.c
@@ -0,0 +1,696 @@
+/*
+ * Copyright (C) 2006-2009 Red Hat, Inc.
+ *
+ * This file is released under the LGPL.
+ */
+
+#include <linux/bio.h>
+#include <linux/dm-dirty-log.h>
+#include <linux/device-mapper.h>
+#include <linux/dm-log-userspace.h>
+
+#include "dm-log-userspace-transfer.h"
+
+struct flush_entry {
+ int type;
+ region_t region;
+ struct list_head list;
+};
+
+struct log_c {
+ struct dm_target *ti;
+ uint32_t region_size;
+ region_t region_count;
+ char uuid[DM_UUID_LEN];
+
+ char *usr_argv_str;
+ uint32_t usr_argc;
+
+ /*
+ * in_sync_hint gets set when doing is_remote_recovering. It
+ * represents the first region that needs recovery. IOW, the
+ * first zero bit of sync_bits. This can be useful for to limit
+ * traffic for calls like is_remote_recovering and get_resync_work,
+ * but be take care in its use for anything else.
+ */
+ uint64_t in_sync_hint;
+
+ spinlock_t flush_lock;
+ struct list_head flush_list; /* only for clear and mark requests */
+};
+
+static mempool_t *flush_entry_pool;
+
+static void *flush_entry_alloc(gfp_t gfp_mask, void *pool_data)
+{
+ return kmalloc(sizeof(struct flush_entry), gfp_mask);
+}
+
+static void flush_entry_free(void *element, void *pool_data)
+{
+ kfree(element);
+}
+
+static int userspace_do_request(struct log_c *lc, const char *uuid,
+ int request_type, char *data, size_t data_size,
+ char *rdata, size_t *rdata_size)
+{
+ int r;
+
+ /*
+ * If the server isn't there, -ESRCH is returned,
+ * and we must keep trying until the server is
+ * restored.
+ */
+retry:
+ r = dm_consult_userspace(uuid, request_type, data,
+ data_size, rdata, rdata_size);
+
+ if (r != -ESRCH)
+ return r;
+
+ DMERR(" Userspace log server not found.");
+ while (1) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(2*HZ);
+ DMWARN("Attempting to contact userspace log server...");
+ r = dm_consult_userspace(uuid, DM_ULOG_CTR, lc->usr_argv_str,
+ strlen(lc->usr_argv_str) + 1,
+ NULL, NULL);
+ if (!r)
+ break;
+ }
+ DMINFO("Reconnected to userspace log server... DM_ULOG_CTR complete");
+ r = dm_consult_userspace(uuid, DM_ULOG_RESUME, NULL,
+ 0, NULL, NULL);
+ if (!r)
+ goto retry;
+
+ DMERR("Error trying to resume userspace log: %d", r);
+
+ return -ESRCH;
+}
+
+static int build_constructor_string(struct dm_target *ti,
+ unsigned argc, char **argv,
+ char **ctr_str)
+{
+ int i, str_size;
+ char *str = NULL;
+
+ *ctr_str = NULL;
+
+ for (i = 0, str_size = 0; i < argc; i++)
+ str_size += strlen(argv[i]) + 1; /* +1 for space between args */
+
+ str_size += 20; /* Max number of chars in a printed u64 number */
+
+ str = kzalloc(str_size, GFP_KERNEL);
+ if (!str) {
+ DMWARN("Unable to allocate memory for constructor string");
+ return -ENOMEM;
+ }
+
+ for (i = 0, str_size = 0; i < argc; i++)
+ str_size += sprintf(str + str_size, "%s ", argv[i]);
+ str_size += sprintf(str + str_size, "%llu",
+ (unsigned long long)ti->len);
+
+ *ctr_str = str;
+ return str_size;
+}
+
+/*
+ * userspace_ctr
+ *
+ * argv contains:
+ * <UUID> <other args>
+ * Where 'other args' is the userspace implementation specific log
+ * arguments. An example might be:
+ * <UUID> clustered_disk <arg count> <log dev> <region_size> [[no]sync]
+ *
+ * So, this module will strip off the <UUID> for identification purposes
+ * when communicating with userspace about a log; but will pass on everything
+ * else.
+ */
+static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti,
+ unsigned argc, char **argv)
+{
+ int r = 0;
+ int str_size;
+ char *ctr_str = NULL;
+ struct log_c *lc = NULL;
+ uint64_t rdata;
+ size_t rdata_size = sizeof(rdata);
+
+ if (argc < 3) {
+ DMWARN("Too few arguments to userspace dirty log");
+ return -EINVAL;
+ }
+
+ lc = kmalloc(sizeof(*lc), GFP_KERNEL);
+ if (!lc) {
+ DMWARN("Unable to allocate userspace log context.");
+ return -ENOMEM;
+ }
+
+ lc->ti = ti;
+
+ if (strlen(argv[0]) > (DM_UUID_LEN - 1)) {
+ DMWARN("UUID argument too long.");
+ kfree(lc);
+ return -EINVAL;
+ }
+
+ strncpy(lc->uuid, argv[0], DM_UUID_LEN);
+ spin_lock_init(&lc->flush_lock);
+ INIT_LIST_HEAD(&lc->flush_list);
+
+ str_size = build_constructor_string(ti, argc - 1, argv + 1, &ctr_str);
+ if (str_size < 0) {
+ kfree(lc);
+ return str_size;
+ }
+
+ /* Send table string */
+ r = dm_consult_userspace(lc->uuid, DM_ULOG_CTR,
+ ctr_str, str_size, NULL, NULL);
+
+ if (r == -ESRCH) {
+ DMERR("Userspace log server not found");
+ goto out;
+ }
+
+ /* Since the region size does not change, get it now */
+ rdata_size = sizeof(rdata);
+ r = dm_consult_userspace(lc->uuid, DM_ULOG_GET_REGION_SIZE,
+ NULL, 0, (char *)&rdata, &rdata_size);
+
+ if (r) {
+ DMERR("Failed to get region size of dirty log");
+ goto out;
+ }
+
+ lc->region_size = (uint32_t)rdata;
+ lc->region_count = dm_sector_div_up(ti->len, lc->region_size);
+
+out:
+ if (r) {
+ kfree(lc);
+ kfree(ctr_str);
+ } else {
+ lc->usr_argv_str = ctr_str;
+ lc->usr_argc = argc;
+ log->context = lc;
+ }
+
+ return r;
+}
+
+static void userspace_dtr(struct dm_dirty_log *log)
+{
+ int r;
+ struct log_c *lc = log->context;
+
+ r = dm_consult_userspace(lc->uuid, DM_ULOG_DTR,
+ NULL, 0,
+ NULL, NULL);
+
+ kfree(lc->usr_argv_str);
+ kfree(lc);
+
+ return;
+}
+
+static int userspace_presuspend(struct dm_dirty_log *log)
+{
+ int r;
+ struct log_c *lc = log->context;
+
+ r = dm_consult_userspace(lc->uuid, DM_ULOG_PRESUSPEND,
+ NULL, 0,
+ NULL, NULL);
+
+ return r;
+}
+
+static int userspace_postsuspend(struct dm_dirty_log *log)
+{
+ int r;
+ struct log_c *lc = log->context;
+
+ r = dm_consult_userspace(lc->uuid, DM_ULOG_POSTSUSPEND,
+ NULL, 0,
+ NULL, NULL);
+
+ return r;
+}
+
+static int userspace_resume(struct dm_dirty_log *log)
+{
+ int r;
+ struct log_c *lc = log->context;
+
+ lc->in_sync_hint = 0;
+ r = dm_consult_userspace(lc->uuid, DM_ULOG_RESUME,
+ NULL, 0,
+ NULL, NULL);
+
+ return r;
+}
+
+static uint32_t userspace_get_region_size(struct dm_dirty_log *log)
+{
+ struct log_c *lc = log->context;
+
+ return lc->region_size;
+}
+
+/*
+ * userspace_is_clean
+ *
+ * Check whether a region is clean. If there is any sort of
+ * failure when consulting the server, we return not clean.
+ *
+ * Returns: 1 if clean, 0 otherwise
+ */
+static int userspace_is_clean(struct dm_dirty_log *log, region_t region)
+{
+ int r;
+ uint64_t region64 = (uint64_t)region;
+ int64_t is_clean;
+ size_t rdata_size;
+ struct log_c *lc = log->context;
+
+ rdata_size = sizeof(is_clean);
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_IS_CLEAN,
+ (char *)&region64, sizeof(region64),
+ (char *)&is_clean, &rdata_size);
+
+ return (r) ? 0 : (int)is_clean;
+}
+
+/*
+ * userspace_in_sync
+ *
+ * Check if the region is in-sync. If there is any sort
+ * of failure when consulting the server, we assume that
+ * the region is not in sync.
+ *
+ * If 'can_block' is set, return immediately
+ *
+ * Returns: 1 if in-sync, 0 if not-in-sync, -EWOULDBLOCK
+ */
+static int userspace_in_sync(struct dm_dirty_log *log, region_t region,
+ int can_block)
+{
+ int r;
+ uint64_t region64 = region;
+ int64_t in_sync;
+ size_t rdata_size;
+ struct log_c *lc = log->context;
+
+ /*
+ * We can never respond directly - even if in_sync_hint is
+ * set. This is because another machine could see a device
+ * failure and mark the region out-of-sync. If we don't go
+ * to userspace to ask, we might think the region is in-sync
+ * and allow a read to pick up data that is stale. (This is
+ * very unlikely if a device actually fails; but it is very
+ * likely if a connection to one device from one machine fails.)
+ *
+ * There still might be a problem if the mirror caches the region
+ * state as in-sync... but then this call would not be made. So,
+ * that is a mirror problem.
+ */
+ if (!can_block)
+ return -EWOULDBLOCK;
+
+ rdata_size = sizeof(in_sync);
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_IN_SYNC,
+ (char *)&region64, sizeof(region64),
+ (char *)&in_sync, &rdata_size);
+ return (r) ? 0 : (int)in_sync;
+}
+
+/*
+ * userspace_flush
+ *
+ * This function is ok to block.
+ * The flush happens in two stages. First, it sends all
+ * clear/mark requests that are on the list. Then it
+ * tells the server to commit them. This gives the
+ * server a chance to optimise the commit, instead of
+ * doing it for every request.
+ *
+ * Additionally, we could implement another thread that
+ * sends the requests up to the server - reducing the
+ * load on flush. Then the flush would have less in
+ * the list and be responsible for the finishing commit.
+ *
+ * Returns: 0 on success, < 0 on failure
+ */
+static int userspace_flush(struct dm_dirty_log *log)
+{
+ int r = 0;
+ unsigned long flags;
+ struct log_c *lc = log->context;
+ LIST_HEAD(flush_list);
+ struct flush_entry *fe, *tmp_fe;
+
+ spin_lock_irqsave(&lc->flush_lock, flags);
+ list_splice_init(&lc->flush_list, &flush_list);
+ spin_unlock_irqrestore(&lc->flush_lock, flags);
+
+ if (list_empty(&flush_list))
+ return 0;
+
+ /*
+ * FIXME: Count up requests, group request types,
+ * allocate memory to stick all requests in and
+ * send to server in one go. Failing the allocation,
+ * do it one by one.
+ */
+
+ list_for_each_entry(fe, &flush_list, list) {
+ r = userspace_do_request(lc, lc->uuid, fe->type,
+ (char *)&fe->region,
+ sizeof(fe->region),
+ NULL, NULL);
+ if (r)
+ goto fail;
+ }
+
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH,
+ NULL, 0, NULL, NULL);
+
+fail:
+ /*
+ * We can safely remove these entries, even if failure.
+ * Calling code will receive an error and will know that
+ * the log facility has failed.
+ */
+ list_for_each_entry_safe(fe, tmp_fe, &flush_list, list) {
+ list_del(&fe->list);
+ mempool_free(fe, flush_entry_pool);
+ }
+
+ if (r)
+ dm_table_event(lc->ti->table);
+
+ return r;
+}
+
+/*
+ * userspace_mark_region
+ *
+ * This function should avoid blocking unless absolutely required.
+ * (Memory allocation is valid for blocking.)
+ */
+static void userspace_mark_region(struct dm_dirty_log *log, region_t region)
+{
+ unsigned long flags;
+ struct log_c *lc = log->context;
+ struct flush_entry *fe;
+
+ /* Wait for an allocation, but _never_ fail */
+ fe = mempool_alloc(flush_entry_pool, GFP_NOIO);
+ BUG_ON(!fe);
+
+ spin_lock_irqsave(&lc->flush_lock, flags);
+ fe->type = DM_ULOG_MARK_REGION;
+ fe->region = region;
+ list_add(&fe->list, &lc->flush_list);
+ spin_unlock_irqrestore(&lc->flush_lock, flags);
+
+ return;
+}
+
+/*
+ * userspace_clear_region
+ *
+ * This function must not block.
+ * So, the alloc can't block. In the worst case, it is ok to
+ * fail. It would simply mean we can't clear the region.
+ * Does nothing to current sync context, but does mean
+ * the region will be re-sync'ed on a reload of the mirror
+ * even though it is in-sync.
+ */
+static void userspace_clear_region(struct dm_dirty_log *log, region_t region)
+{
+ unsigned long flags;
+ struct log_c *lc = log->context;
+ struct flush_entry *fe;
+
+ /*
+ * If we fail to allocate, we skip the clearing of
+ * the region. This doesn't hurt us in any way, except
+ * to cause the region to be resync'ed when the
+ * device is activated next time.
+ */
+ fe = mempool_alloc(flush_entry_pool, GFP_ATOMIC);
+ if (!fe) {
+ DMERR("Failed to allocate memory to clear region.");
+ return;
+ }
+
+ spin_lock_irqsave(&lc->flush_lock, flags);
+ fe->type = DM_ULOG_CLEAR_REGION;
+ fe->region = region;
+ list_add(&fe->list, &lc->flush_list);
+ spin_unlock_irqrestore(&lc->flush_lock, flags);
+
+ return;
+}
+
+/*
+ * userspace_get_resync_work
+ *
+ * Get a region that needs recovery. It is valid to return
+ * an error for this function.
+ *
+ * Returns: 1 if region filled, 0 if no work, <0 on error
+ */
+static int userspace_get_resync_work(struct dm_dirty_log *log, region_t *region)
+{
+ int r;
+ size_t rdata_size;
+ struct log_c *lc = log->context;
+ struct {
+ int64_t i; /* 64-bit for mix arch compatibility */
+ region_t r;
+ } pkg;
+
+ if (lc->in_sync_hint >= lc->region_count)
+ return 0;
+
+ rdata_size = sizeof(pkg);
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_RESYNC_WORK,
+ NULL, 0,
+ (char *)&pkg, &rdata_size);
+
+ *region = pkg.r;
+ return (r) ? r : (int)pkg.i;
+}
+
+/*
+ * userspace_set_region_sync
+ *
+ * Set the sync status of a given region. This function
+ * must not fail.
+ */
+static void userspace_set_region_sync(struct dm_dirty_log *log,
+ region_t region, int in_sync)
+{
+ int r;
+ struct log_c *lc = log->context;
+ struct {
+ region_t r;
+ int64_t i;
+ } pkg;
+
+ pkg.r = region;
+ pkg.i = (int64_t)in_sync;
+
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_SET_REGION_SYNC,
+ (char *)&pkg, sizeof(pkg),
+ NULL, NULL);
+
+ /*
+ * It would be nice to be able to report failures.
+ * However, it is easy emough to detect and resolve.
+ */
+ return;
+}
+
+/*
+ * userspace_get_sync_count
+ *
+ * If there is any sort of failure when consulting the server,
+ * we assume that the sync count is zero.
+ *
+ * Returns: sync count on success, 0 on failure
+ */
+static region_t userspace_get_sync_count(struct dm_dirty_log *log)
+{
+ int r;
+ size_t rdata_size;
+ uint64_t sync_count;
+ struct log_c *lc = log->context;
+
+ rdata_size = sizeof(sync_count);
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_SYNC_COUNT,
+ NULL, 0,
+ (char *)&sync_count, &rdata_size);
+
+ if (r)
+ return 0;
+
+ if (sync_count >= lc->region_count)
+ lc->in_sync_hint = lc->region_count;
+
+ return (region_t)sync_count;
+}
+
+/*
+ * userspace_status
+ *
+ * Returns: amount of space consumed
+ */
+static int userspace_status(struct dm_dirty_log *log, status_type_t status_type,
+ char *result, unsigned maxlen)
+{
+ int r = 0;
+ size_t sz = (size_t)maxlen;
+ struct log_c *lc = log->context;
+
+ switch (status_type) {
+ case STATUSTYPE_INFO:
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_STATUS_INFO,
+ NULL, 0,
+ result, &sz);
+
+ if (r) {
+ sz = 0;
+ DMEMIT("%s 1 COM_FAILURE", log->type->name);
+ }
+ break;
+ case STATUSTYPE_TABLE:
+ sz = 0;
+ DMEMIT("%s %u %s %s", log->type->name, lc->usr_argc + 1,
+ lc->uuid, lc->usr_argv_str);
+ break;
+ }
+ return (r) ? 0 : (int)sz;
+}
+
+/*
+ * userspace_is_remote_recovering
+ *
+ * Returns: 1 if region recovering, 0 otherwise
+ */
+static int userspace_is_remote_recovering(struct dm_dirty_log *log,
+ region_t region)
+{
+ int r;
+ uint64_t region64 = region;
+ struct log_c *lc = log->context;
+ static unsigned long long limit;
+ struct {
+ int64_t is_recovering;
+ uint64_t in_sync_hint;
+ } pkg;
+ size_t rdata_size = sizeof(pkg);
+
+ /*
+ * Once the mirror has been reported to be in-sync,
+ * it will never again ask for recovery work. So,
+ * we can safely say there is not a remote machine
+ * recovering if the device is in-sync. (in_sync_hint
+ * must be reset at resume time.)
+ */
+ if (region < lc->in_sync_hint)
+ return 0;
+ else if (jiffies < limit)
+ return 1;
+
+ limit = jiffies + (HZ / 4);
+ r = userspace_do_request(lc, lc->uuid, DM_ULOG_IS_REMOTE_RECOVERING,
+ (char *)&region64, sizeof(region64),
+ (char *)&pkg, &rdata_size);
+ if (r)
+ return 1;
+
+ lc->in_sync_hint = pkg.in_sync_hint;
+
+ return (int)pkg.is_recovering;
+}
+
+static struct dm_dirty_log_type _userspace_type = {
+ .name = "userspace",
+ .module = THIS_MODULE,
+ .ctr = userspace_ctr,
+ .dtr = userspace_dtr,
+ .presuspend = userspace_presuspend,
+ .postsuspend = userspace_postsuspend,
+ .resume = userspace_resume,
+ .get_region_size = userspace_get_region_size,
+ .is_clean = userspace_is_clean,
+ .in_sync = userspace_in_sync,
+ .flush = userspace_flush,
+ .mark_region = userspace_mark_region,
+ .clear_region = userspace_clear_region,
+ .get_resync_work = userspace_get_resync_work,
+ .set_region_sync = userspace_set_region_sync,
+ .get_sync_count = userspace_get_sync_count,
+ .status = userspace_status,
+ .is_remote_recovering = userspace_is_remote_recovering,
+};
+
+static int __init userspace_dirty_log_init(void)
+{
+ int r = 0;
+
+ flush_entry_pool = mempool_create(100, flush_entry_alloc,
+ flush_entry_free, NULL);
+
+ if (!flush_entry_pool) {
+ DMWARN("Unable to create flush_entry_pool: No memory.");
+ return -ENOMEM;
+ }
+
+ r = dm_ulog_tfr_init();
+ if (r) {
+ DMWARN("Unable to initialize userspace log communications");
+ mempool_destroy(flush_entry_pool);
+ return r;
+ }
+
+ r = dm_dirty_log_type_register(&_userspace_type);
+ if (r) {
+ DMWARN("Couldn't register userspace dirty log type");
+ dm_ulog_tfr_exit();
+ mempool_destroy(flush_entry_pool);
+ return r;
+ }
+
+ DMINFO("version 1.0.0 loaded");
+ return 0;
+}
+
+static void __exit userspace_dirty_log_exit(void)
+{
+ dm_dirty_log_type_unregister(&_userspace_type);
+ dm_ulog_tfr_exit();
+ mempool_destroy(flush_entry_pool);
+
+ DMINFO("version 1.0.0 unloaded");
+ return;
+}
+
+module_init(userspace_dirty_log_init);
+module_exit(userspace_dirty_log_exit);
+
+MODULE_DESCRIPTION(DM_NAME " userspace dirty log link");
+MODULE_AUTHOR("Jonathan Brassow <dm-devel@redhat.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
new file mode 100644
index 0000000..0ca1ee7
--- /dev/null
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2006-2009 Red Hat, Inc.
+ *
+ * This file is released under the LGPL.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <net/sock.h>
+#include <linux/workqueue.h>
+#include <linux/connector.h>
+#include <linux/device-mapper.h>
+#include <linux/dm-log-userspace.h>
+
+#include "dm-log-userspace-transfer.h"
+
+static uint32_t dm_ulog_seq;
+
+/*
+ * Netlink/Connector is an unreliable protocol. How long should
+ * we wait for a response before assuming it was lost and retrying?
+ * (If we do receive a response after this time, it will be discarded
+ * and the response to the resent request will be waited for.
+ */
+#define DM_ULOG_RETRY_TIMEOUT (15 * HZ)
+
+/*
+ * Pre-allocated space for speed
+ */
+#define DM_ULOG_PREALLOCED_SIZE 512
+static struct cn_msg *prealloced_cn_msg;
+static struct dm_ulog_request *prealloced_ulog_tfr;
+
+static struct cb_id ulog_cn_id = {
+ .idx = CN_IDX_DM,
+ .val = CN_VAL_DM_USERSPACE_LOG
+};
+
+static DEFINE_MUTEX(dm_ulog_lock);
+
+struct receiving_pkg {
+ struct list_head list;
+ struct completion complete;
+
+ uint32_t seq;
+
+ int error;
+ size_t *data_size;
+ char *data;
+};
+
+static DEFINE_SPINLOCK(receiving_list_lock);
+static struct list_head receiving_list;
+
+static int dm_ulog_sendto_server(struct dm_ulog_request *tfr)
+{
+ int r;
+ struct cn_msg *msg = prealloced_cn_msg;
+
+ memset(msg, 0, sizeof(struct cn_msg));
+
+ msg->id.idx = ulog_cn_id.idx;
+ msg->id.val = ulog_cn_id.val;
+ msg->ack = 0;
+ msg->seq = tfr->seq;
+ msg->len = sizeof(struct dm_ulog_request) + tfr->data_size;
+
+ r = cn_netlink_send(msg, 0, gfp_any());
+
+ return r;
+}
+
+/*
+ * Parameters for this function can be either msg or tfr, but not
+ * both. This function fills in the reply for a waiting request.
+ * If just msg is given, then the reply is simply an ACK from userspace
+ * that the request was received.
+ *
+ * Returns: 0 on success, -ENOENT on failure
+ */
+static int fill_pkg(struct cn_msg *msg, struct dm_ulog_request *tfr)
+{
+ uint32_t rtn_seq = (msg) ? msg->seq : (tfr) ? tfr->seq : 0;
+ struct receiving_pkg *pkg;
+
+ /*
+ * The 'receiving_pkg' entries in this list are statically
+ * allocated on the stack in 'dm_consult_userspace'.
+ * Each process that is waiting for a reply from the user
+ * space server will have an entry in this list.
+ *
+ * We are safe to do it this way because the stack space
+ * is unique to each process, but still addressable by
+ * other processes.
+ */
+ list_for_each_entry(pkg, &receiving_list, list) {
+ if (rtn_seq != pkg->seq)
+ continue;
+
+ if (msg) {
+ pkg->error = -msg->ack;
+ /*
+ * If we are trying again, we will need to know our
+ * storage capacity. Otherwise, along with the
+ * error code, we make explicit that we have no data.
+ */
+ if (pkg->error != -EAGAIN)
+ *(pkg->data_size) = 0;
+ } else if (tfr->data_size > *(pkg->data_size)) {
+ DMERR("Insufficient space to receive package [%u] "
+ "(%u vs %lu)", tfr->request_type,
+ tfr->data_size, *(pkg->data_size));
+
+ *(pkg->data_size) = 0;
+ pkg->error = -ENOSPC;
+ } else {
+ pkg->error = tfr->error;
+ memcpy(pkg->data, tfr->data, tfr->data_size);
+ *(pkg->data_size) = tfr->data_size;
+ }
+ complete(&pkg->complete);
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
+/*
+ * This is the connector callback that delivers data
+ * that was sent from userspace.
+ */
+static void cn_ulog_callback(void *data)
+{
+ struct cn_msg *msg = (struct cn_msg *)data;
+ struct dm_ulog_request *tfr = (struct dm_ulog_request *)(msg + 1);
+
+ spin_lock(&receiving_list_lock);
+ if (msg->len == 0)
+ fill_pkg(msg, NULL);
+ else if (msg->len < sizeof(*tfr))
+ DMERR("Incomplete message received (expected %u, got %u): [%u]",
+ (unsigned)sizeof(*tfr), msg->len, msg->seq);
+ else
+ fill_pkg(NULL, tfr);
+ spin_unlock(&receiving_list_lock);
+}
+
+/**
+ * dm_consult_userspace
+ * @uuid: log's uuid (must be DM_UUID_LEN in size)
+ * @request_type: found in include/linux/dm-log-userspace.h
+ * @data: data to tx to the server
+ * @data_size: size of data in bytes
+ * @rdata: place to put return data from server
+ * @rdata_size: value-result (amount of space given/amount of space used)
+ *
+ * rdata_size is undefined on failure.
+ *
+ * Memory used to communicate with userspace is zero'ed
+ * before populating to ensure that no unwanted bits leak
+ * from kernel space to user-space. All userspace log communications
+ * between kernel and user space go through this function.
+ *
+ * Returns: 0 on success, -EXXX on failure
+ **/
+int dm_consult_userspace(const char *uuid, int request_type,
+ char *data, size_t data_size,
+ char *rdata, size_t *rdata_size)
+{
+ int r = 0;
+ size_t dummy = 0;
+ int overhead_size =
+ sizeof(struct dm_ulog_request *) + sizeof(struct cn_msg);
+ struct dm_ulog_request *tfr = prealloced_ulog_tfr;
+ struct receiving_pkg pkg;
+
+ if (data_size > (DM_ULOG_PREALLOCED_SIZE - overhead_size)) {
+ DMINFO("Size of tfr exceeds preallocated size");
+ return -EINVAL;
+ }
+
+ if (!rdata_size)
+ rdata_size = &dummy;
+resend:
+ /*
+ * We serialize the sending of requests so we can
+ * use the preallocated space.
+ */
+ mutex_lock(&dm_ulog_lock);
+
+ memset(tfr, 0, DM_ULOG_PREALLOCED_SIZE - overhead_size);
+ memcpy(tfr->uuid, uuid, DM_UUID_LEN);
+ tfr->seq = dm_ulog_seq++;
+
+ /*
+ * Must be valid request type (all other bits set to
+ * zero). This reserves other bits for possible future
+ * use.
+ */
+ tfr->request_type = request_type & DM_ULOG_REQUEST_MASK;
+
+ tfr->data_size = data_size;
+ if (data && data_size)
+ memcpy(tfr->data, data, data_size);
+
+ memset(&pkg, 0, sizeof(pkg));
+ init_completion(&pkg.complete);
+ pkg.seq = tfr->seq;
+ pkg.data_size = rdata_size;
+ pkg.data = rdata;
+ spin_lock(&receiving_list_lock);
+ list_add(&(pkg.list), &receiving_list);
+ spin_unlock(&receiving_list_lock);
+
+ r = dm_ulog_sendto_server(tfr);
+
+ mutex_unlock(&dm_ulog_lock);
+
+ if (r) {
+ DMERR("Unable to send log request [%u] to userspace: %d",
+ request_type, r);
+ spin_lock(&receiving_list_lock);
+ list_del_init(&(pkg.list));
+ spin_unlock(&receiving_list_lock);
+
+ goto out;
+ }
+
+ r = wait_for_completion_timeout(&(pkg.complete), DM_ULOG_RETRY_TIMEOUT);
+ spin_lock(&receiving_list_lock);
+ list_del_init(&(pkg.list));
+ spin_unlock(&receiving_list_lock);
+ if (!r) {
+ DMWARN("[%s] Request timed out: [%u/%u] - retrying",
+ (strlen(uuid) > 8) ?
+ (uuid + (strlen(uuid) - 8)) : (uuid),
+ request_type, pkg.seq);
+ goto resend;
+ }
+
+ r = pkg.error;
+ if (r == -EAGAIN)
+ goto resend;
+
+out:
+ return r;
+}
+
+int dm_ulog_tfr_init(void)
+{
+ int r;
+ void *prealloced;
+
+ INIT_LIST_HEAD(&receiving_list);
+
+ prealloced = kmalloc(DM_ULOG_PREALLOCED_SIZE, GFP_KERNEL);
+ if (!prealloced)
+ return -ENOMEM;
+
+ prealloced_cn_msg = prealloced;
+ prealloced_ulog_tfr = prealloced + sizeof(struct cn_msg);
+
+ r = cn_add_callback(&ulog_cn_id, "dmlogusr", cn_ulog_callback);
+ if (r) {
+ cn_del_callback(&ulog_cn_id);
+ return r;
+ }
+
+ return 0;
+}
+
+void dm_ulog_tfr_exit(void)
+{
+ cn_del_callback(&ulog_cn_id);
+ kfree(prealloced_cn_msg);
+}
diff --git a/drivers/md/dm-log-userspace-transfer.h b/drivers/md/dm-log-userspace-transfer.h
new file mode 100644
index 0000000..c26d8e4
--- /dev/null
+++ b/drivers/md/dm-log-userspace-transfer.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2006-2009 Red Hat, Inc.
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef __DM_LOG_USERSPACE_TRANSFER_H__
+#define __DM_LOG_USERSPACE_TRANSFER_H__
+
+#define DM_MSG_PREFIX "dm-log-userspace"
+
+int dm_ulog_tfr_init(void);
+void dm_ulog_tfr_exit(void);
+int dm_consult_userspace(const char *uuid, int request_type,
+ char *data, size_t data_size,
+ char *rdata, size_t *rdata_size);
+
+#endif /* __DM_LOG_USERSPACE_TRANSFER_H__ */
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index be233bc..9443896 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -412,10 +412,12 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
/*
* Buffer holds both header and bitset.
*/
- buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
- bitset_size, ti->limits.hardsect_size);
+ buf_size =
+ dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size,
+ bdev_logical_block_size(lc->header_location.
+ bdev));
- if (buf_size > dev->bdev->bd_inode->i_size) {
+ if (buf_size > i_size_read(dev->bdev->bd_inode)) {
DMWARN("log device %s too small: need %llu bytes",
dev->name, (unsigned long long)buf_size);
kfree(lc);
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 6a386ab..c70604a 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -8,7 +8,6 @@
#include <linux/device-mapper.h>
#include "dm-path-selector.h"
-#include "dm-bio-record.h"
#include "dm-uevent.h"
#include <linux/ctype.h>
@@ -35,6 +34,7 @@ struct pgpath {
struct dm_path path;
struct work_struct deactivate_path;
+ struct work_struct activate_path;
};
#define path_to_pgpath(__pgp) container_of((__pgp), struct pgpath, path)
@@ -64,8 +64,6 @@ struct multipath {
spinlock_t lock;
const char *hw_handler_name;
- struct work_struct activate_path;
- struct pgpath *pgpath_to_activate;
unsigned nr_priority_groups;
struct list_head priority_groups;
unsigned pg_init_required; /* pg_init needs calling? */
@@ -84,7 +82,7 @@ struct multipath {
unsigned pg_init_count; /* Number of times pg_init called */
struct work_struct process_queued_ios;
- struct bio_list queued_ios;
+ struct list_head queued_ios;
unsigned queue_size;
struct work_struct trigger_event;
@@ -101,7 +99,7 @@ struct multipath {
*/
struct dm_mpath_io {
struct pgpath *pgpath;
- struct dm_bio_details details;
+ size_t nr_bytes;
};
typedef int (*action_fn) (struct pgpath *pgpath);
@@ -128,6 +126,7 @@ static struct pgpath *alloc_pgpath(void)
if (pgpath) {
pgpath->is_active = 1;
INIT_WORK(&pgpath->deactivate_path, deactivate_path);
+ INIT_WORK(&pgpath->activate_path, activate_path);
}
return pgpath;
@@ -160,7 +159,6 @@ static struct priority_group *alloc_priority_group(void)
static void free_pgpaths(struct list_head *pgpaths, struct dm_target *ti)
{
- unsigned long flags;
struct pgpath *pgpath, *tmp;
struct multipath *m = ti->private;
@@ -169,10 +167,6 @@ static void free_pgpaths(struct list_head *pgpaths, struct dm_target *ti)
if (m->hw_handler_name)
scsi_dh_detach(bdev_get_queue(pgpath->path.dev->bdev));
dm_put_device(ti, pgpath->path.dev);
- spin_lock_irqsave(&m->lock, flags);
- if (m->pgpath_to_activate == pgpath)
- m->pgpath_to_activate = NULL;
- spin_unlock_irqrestore(&m->lock, flags);
free_pgpath(pgpath);
}
}
@@ -198,11 +192,11 @@ static struct multipath *alloc_multipath(struct dm_target *ti)
m = kzalloc(sizeof(*m), GFP_KERNEL);
if (m) {
INIT_LIST_HEAD(&m->priority_groups);
+ INIT_LIST_HEAD(&m->queued_ios);
spin_lock_init(&m->lock);
m->queue_io = 1;
INIT_WORK(&m->process_queued_ios, process_queued_ios);
INIT_WORK(&m->trigger_event, trigger_event);
- INIT_WORK(&m->activate_path, activate_path);
m->mpio_pool = mempool_create_slab_pool(MIN_IOS, _mpio_cache);
if (!m->mpio_pool) {
kfree(m);
@@ -250,11 +244,12 @@ static void __switch_pg(struct multipath *m, struct pgpath *pgpath)
m->pg_init_count = 0;
}
-static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg)
+static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg,
+ size_t nr_bytes)
{
struct dm_path *path;
- path = pg->ps.type->select_path(&pg->ps, &m->repeat_count);
+ path = pg->ps.type->select_path(&pg->ps, &m->repeat_count, nr_bytes);
if (!path)
return -ENXIO;
@@ -266,7 +261,7 @@ static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg)
return 0;
}
-static void __choose_pgpath(struct multipath *m)
+static void __choose_pgpath(struct multipath *m, size_t nr_bytes)
{
struct priority_group *pg;
unsigned bypassed = 1;
@@ -278,12 +273,12 @@ static void __choose_pgpath(struct multipath *m)
if (m->next_pg) {
pg = m->next_pg;
m->next_pg = NULL;
- if (!__choose_path_in_pg(m, pg))
+ if (!__choose_path_in_pg(m, pg, nr_bytes))
return;
}
/* Don't change PG until it has no remaining paths */
- if (m->current_pg && !__choose_path_in_pg(m, m->current_pg))
+ if (m->current_pg && !__choose_path_in_pg(m, m->current_pg, nr_bytes))
return;
/*
@@ -295,7 +290,7 @@ static void __choose_pgpath(struct multipath *m)
list_for_each_entry(pg, &m->priority_groups, list) {
if (pg->bypassed == bypassed)
continue;
- if (!__choose_path_in_pg(m, pg))
+ if (!__choose_path_in_pg(m, pg, nr_bytes))
return;
}
} while (bypassed--);
@@ -322,19 +317,21 @@ static int __must_push_back(struct multipath *m)
dm_noflush_suspending(m->ti));
}
-static int map_io(struct multipath *m, struct bio *bio,
+static int map_io(struct multipath *m, struct request *clone,
struct dm_mpath_io *mpio, unsigned was_queued)
{
int r = DM_MAPIO_REMAPPED;
+ size_t nr_bytes = blk_rq_bytes(clone);
unsigned long flags;
struct pgpath *pgpath;
+ struct block_device *bdev;
spin_lock_irqsave(&m->lock, flags);
/* Do we need to select a new pgpath? */
if (!m->current_pgpath ||
(!m->queue_io && (m->repeat_count && --m->repeat_count == 0)))
- __choose_pgpath(m);
+ __choose_pgpath(m, nr_bytes);
pgpath = m->current_pgpath;
@@ -344,21 +341,28 @@ static int map_io(struct multipath *m, struct bio *bio,
if ((pgpath && m->queue_io) ||
(!pgpath && m->queue_if_no_path)) {
/* Queue for the daemon to resubmit */
- bio_list_add(&m->queued_ios, bio);
+ list_add_tail(&clone->queuelist, &m->queued_ios);
m->queue_size++;
if ((m->pg_init_required && !m->pg_init_in_progress) ||
!m->queue_io)
queue_work(kmultipathd, &m->process_queued_ios);
pgpath = NULL;
r = DM_MAPIO_SUBMITTED;
- } else if (pgpath)
- bio->bi_bdev = pgpath->path.dev->bdev;
- else if (__must_push_back(m))
+ } else if (pgpath) {
+ bdev = pgpath->path.dev->bdev;
+ clone->q = bdev_get_queue(bdev);
+ clone->rq_disk = bdev->bd_disk;
+ } else if (__must_push_back(m))
r = DM_MAPIO_REQUEUE;
else
r = -EIO; /* Failed */
mpio->pgpath = pgpath;
+ mpio->nr_bytes = nr_bytes;
+
+ if (r == DM_MAPIO_REMAPPED && pgpath->pg->ps.type->start_io)
+ pgpath->pg->ps.type->start_io(&pgpath->pg->ps, &pgpath->path,
+ nr_bytes);
spin_unlock_irqrestore(&m->lock, flags);
@@ -396,30 +400,31 @@ static void dispatch_queued_ios(struct multipath *m)
{
int r;
unsigned long flags;
- struct bio *bio = NULL, *next;
struct dm_mpath_io *mpio;
union map_info *info;
+ struct request *clone, *n;
+ LIST_HEAD(cl);
spin_lock_irqsave(&m->lock, flags);
- bio = bio_list_get(&m->queued_ios);
+ list_splice_init(&m->queued_ios, &cl);
spin_unlock_irqrestore(&m->lock, flags);
- while (bio) {
- next = bio->bi_next;
- bio->bi_next = NULL;
+ list_for_each_entry_safe(clone, n, &cl, queuelist) {
+ list_del_init(&clone->queuelist);
- info = dm_get_mapinfo(bio);
+ info = dm_get_rq_mapinfo(clone);
mpio = info->ptr;
- r = map_io(m, bio, mpio, 1);
- if (r < 0)
- bio_endio(bio, r);
- else if (r == DM_MAPIO_REMAPPED)
- generic_make_request(bio);
- else if (r == DM_MAPIO_REQUEUE)
- bio_endio(bio, -EIO);
-
- bio = next;
+ r = map_io(m, clone, mpio, 1);
+ if (r < 0) {
+ mempool_free(mpio, m->mpio_pool);
+ dm_kill_unmapped_request(clone, r);
+ } else if (r == DM_MAPIO_REMAPPED)
+ dm_dispatch_request(clone);
+ else if (r == DM_MAPIO_REQUEUE) {
+ mempool_free(mpio, m->mpio_pool);
+ dm_requeue_unmapped_request(clone);
+ }
}
}
@@ -427,8 +432,8 @@ static void process_queued_ios(struct work_struct *work)
{
struct multipath *m =
container_of(work, struct multipath, process_queued_ios);
- struct pgpath *pgpath = NULL;
- unsigned init_required = 0, must_queue = 1;
+ struct pgpath *pgpath = NULL, *tmp;
+ unsigned must_queue = 1;
unsigned long flags;
spin_lock_irqsave(&m->lock, flags);
@@ -437,7 +442,7 @@ static void process_queued_ios(struct work_struct *work)
goto out;
if (!m->current_pgpath)
- __choose_pgpath(m);
+ __choose_pgpath(m, 0);
pgpath = m->current_pgpath;
@@ -446,19 +451,15 @@ static void process_queued_ios(struct work_struct *work)
must_queue = 0;
if (m->pg_init_required && !m->pg_init_in_progress && pgpath) {
- m->pgpath_to_activate = pgpath;
m->pg_init_count++;
m->pg_init_required = 0;
- m->pg_init_in_progress = 1;
- init_required = 1;
+ list_for_each_entry(tmp, &pgpath->pg->pgpaths, list) {
+ if (queue_work(kmpath_handlerd, &tmp->activate_path))
+ m->pg_init_in_progress++;
+ }
}
-
out:
spin_unlock_irqrestore(&m->lock, flags);
-
- if (init_required)
- queue_work(kmpath_handlerd, &m->activate_path);
-
if (!must_queue)
dispatch_queued_ios(m);
}
@@ -553,6 +554,12 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
return -EINVAL;
}
+ if (ps_argc > as->argc) {
+ dm_put_path_selector(pst);
+ ti->error = "not enough arguments for path selector";
+ return -EINVAL;
+ }
+
r = pst->create(&pg->ps, ps_argc, as->argv);
if (r) {
dm_put_path_selector(pst);
@@ -591,9 +598,20 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
}
if (m->hw_handler_name) {
- r = scsi_dh_attach(bdev_get_queue(p->path.dev->bdev),
- m->hw_handler_name);
+ struct request_queue *q = bdev_get_queue(p->path.dev->bdev);
+
+ r = scsi_dh_attach(q, m->hw_handler_name);
+ if (r == -EBUSY) {
+ /*
+ * Already attached to different hw_handler,
+ * try to reattach with correct one.
+ */
+ scsi_dh_detach(q);
+ r = scsi_dh_attach(q, m->hw_handler_name);
+ }
+
if (r < 0) {
+ ti->error = "error attaching hardware handler";
dm_put_device(ti, p->path.dev);
goto bad;
}
@@ -699,6 +717,11 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m)
if (!hw_argc)
return 0;
+ if (hw_argc > as->argc) {
+ ti->error = "not enough arguments for hardware handler";
+ return -EINVAL;
+ }
+
m->hw_handler_name = kstrdup(shift(as), GFP_KERNEL);
request_module("scsi_dh_%s", m->hw_handler_name);
if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
@@ -823,6 +846,8 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
goto bad;
}
+ ti->num_flush_requests = 1;
+
return 0;
bad:
@@ -836,25 +861,29 @@ static void multipath_dtr(struct dm_target *ti)
flush_workqueue(kmpath_handlerd);
flush_workqueue(kmultipathd);
+ flush_scheduled_work();
free_multipath(m);
}
/*
- * Map bios, recording original fields for later in case we have to resubmit
+ * Map cloned requests
*/
-static int multipath_map(struct dm_target *ti, struct bio *bio,
+static int multipath_map(struct dm_target *ti, struct request *clone,
union map_info *map_context)
{
int r;
struct dm_mpath_io *mpio;
struct multipath *m = (struct multipath *) ti->private;
- mpio = mempool_alloc(m->mpio_pool, GFP_NOIO);
- dm_bio_record(&mpio->details, bio);
+ mpio = mempool_alloc(m->mpio_pool, GFP_ATOMIC);
+ if (!mpio)
+ /* ENOMEM, requeue */
+ return DM_MAPIO_REQUEUE;
+ memset(mpio, 0, sizeof(*mpio));
map_context->ptr = mpio;
- bio->bi_rw |= (1 << BIO_RW_FAILFAST_TRANSPORT);
- r = map_io(m, bio, mpio, 0);
+ clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;
+ r = map_io(m, clone, mpio, 0);
if (r < 0 || r == DM_MAPIO_REQUEUE)
mempool_free(mpio, m->mpio_pool);
@@ -924,9 +953,13 @@ static int reinstate_path(struct pgpath *pgpath)
pgpath->is_active = 1;
- m->current_pgpath = NULL;
- if (!m->nr_valid_paths++ && m->queue_size)
+ if (!m->nr_valid_paths++ && m->queue_size) {
+ m->current_pgpath = NULL;
queue_work(kmultipathd, &m->process_queued_ios);
+ } else if (m->hw_handler_name && (m->current_pg == pgpath->pg)) {
+ if (queue_work(kmpath_handlerd, &pgpath->activate_path))
+ m->pg_init_in_progress++;
+ }
dm_path_uevent(DM_UEVENT_PATH_REINSTATED, m->ti,
pgpath->path.dev->name, m->nr_valid_paths);
@@ -1102,87 +1135,70 @@ static void pg_init_done(struct dm_path *path, int errors)
spin_lock_irqsave(&m->lock, flags);
if (errors) {
- DMERR("Could not failover device. Error %d.", errors);
- m->current_pgpath = NULL;
- m->current_pg = NULL;
+ if (pgpath == m->current_pgpath) {
+ DMERR("Could not failover device. Error %d.", errors);
+ m->current_pgpath = NULL;
+ m->current_pg = NULL;
+ }
} else if (!m->pg_init_required) {
m->queue_io = 0;
pg->bypassed = 0;
}
- m->pg_init_in_progress = 0;
- queue_work(kmultipathd, &m->process_queued_ios);
+ m->pg_init_in_progress--;
+ if (!m->pg_init_in_progress)
+ queue_work(kmultipathd, &m->process_queued_ios);
spin_unlock_irqrestore(&m->lock, flags);
}
static void activate_path(struct work_struct *work)
{
int ret;
- struct multipath *m =
- container_of(work, struct multipath, activate_path);
- struct dm_path *path;
- unsigned long flags;
+ struct pgpath *pgpath =
+ container_of(work, struct pgpath, activate_path);
- spin_lock_irqsave(&m->lock, flags);
- path = &m->pgpath_to_activate->path;
- m->pgpath_to_activate = NULL;
- spin_unlock_irqrestore(&m->lock, flags);
- if (!path)
- return;
- ret = scsi_dh_activate(bdev_get_queue(path->dev->bdev));
- pg_init_done(path, ret);
+ ret = scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev));
+ pg_init_done(&pgpath->path, ret);
}
/*
* end_io handling
*/
-static int do_end_io(struct multipath *m, struct bio *bio,
+static int do_end_io(struct multipath *m, struct request *clone,
int error, struct dm_mpath_io *mpio)
{
+ /*
+ * We don't queue any clone request inside the multipath target
+ * during end I/O handling, since those clone requests don't have
+ * bio clones. If we queue them inside the multipath target,
+ * we need to make bio clones, that requires memory allocation.
+ * (See drivers/md/dm.c:end_clone_bio() about why the clone requests
+ * don't have bio clones.)
+ * Instead of queueing the clone request here, we queue the original
+ * request into dm core, which will remake a clone request and
+ * clone bios for it and resubmit it later.
+ */
+ int r = DM_ENDIO_REQUEUE;
unsigned long flags;
- if (!error)
+ if (!error && !clone->errors)
return 0; /* I/O complete */
- if ((error == -EWOULDBLOCK) && bio_rw_ahead(bio))
- return error;
-
if (error == -EOPNOTSUPP)
return error;
- spin_lock_irqsave(&m->lock, flags);
- if (!m->nr_valid_paths) {
- if (__must_push_back(m)) {
- spin_unlock_irqrestore(&m->lock, flags);
- return DM_ENDIO_REQUEUE;
- } else if (!m->queue_if_no_path) {
- spin_unlock_irqrestore(&m->lock, flags);
- return -EIO;
- } else {
- spin_unlock_irqrestore(&m->lock, flags);
- goto requeue;
- }
- }
- spin_unlock_irqrestore(&m->lock, flags);
-
if (mpio->pgpath)
fail_path(mpio->pgpath);
- requeue:
- dm_bio_restore(&mpio->details, bio);
-
- /* queue for the daemon to resubmit or fail */
spin_lock_irqsave(&m->lock, flags);
- bio_list_add(&m->queued_ios, bio);
- m->queue_size++;
- if (!m->queue_io)
- queue_work(kmultipathd, &m->process_queued_ios);
+ if (!m->nr_valid_paths && !m->queue_if_no_path && !__must_push_back(m))
+ r = -EIO;
spin_unlock_irqrestore(&m->lock, flags);
- return DM_ENDIO_INCOMPLETE; /* io not complete */
+ return r;
}
-static int multipath_end_io(struct dm_target *ti, struct bio *bio,
+static int multipath_end_io(struct dm_target *ti, struct request *clone,
int error, union map_info *map_context)
{
struct multipath *m = ti->private;
@@ -1191,14 +1207,13 @@ static int multipath_end_io(struct dm_target *ti, struct bio *bio,
struct path_selector *ps;
int r;
- r = do_end_io(m, bio, error, mpio);
+ r = do_end_io(m, clone, error, mpio);
if (pgpath) {
ps = &pgpath->pg->ps;
if (ps->type->end_io)
- ps->type->end_io(ps, &pgpath->path);
+ ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
}
- if (r != DM_ENDIO_INCOMPLETE)
- mempool_free(mpio, m->mpio_pool);
+ mempool_free(mpio, m->mpio_pool);
return r;
}
@@ -1411,7 +1426,7 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
spin_lock_irqsave(&m->lock, flags);
if (!m->current_pgpath)
- __choose_pgpath(m);
+ __choose_pgpath(m, 0);
if (m->current_pgpath) {
bdev = m->current_pgpath->path.dev->bdev;
@@ -1428,22 +1443,113 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
+static int multipath_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct multipath *m = ti->private;
+ struct priority_group *pg;
+ struct pgpath *p;
+ int ret = 0;
+
+ list_for_each_entry(pg, &m->priority_groups, list) {
+ list_for_each_entry(p, &pg->pgpaths, list) {
+ ret = fn(ti, p->path.dev, ti->begin, data);
+ if (ret)
+ goto out;
+ }
+ }
+
+out:
+ return ret;
+}
+
+static int __pgpath_busy(struct pgpath *pgpath)
+{
+ struct request_queue *q = bdev_get_queue(pgpath->path.dev->bdev);
+
+ return dm_underlying_device_busy(q);
+}
+
+/*
+ * We return "busy", only when we can map I/Os but underlying devices
+ * are busy (so even if we map I/Os now, the I/Os will wait on
+ * the underlying queue).
+ * In other words, if we want to kill I/Os or queue them inside us
+ * due to map unavailability, we don't return "busy". Otherwise,
+ * dm core won't give us the I/Os and we can't do what we want.
+ */
+static int multipath_busy(struct dm_target *ti)
+{
+ int busy = 0, has_active = 0;
+ struct multipath *m = ti->private;
+ struct priority_group *pg;
+ struct pgpath *pgpath;
+ unsigned long flags;
+
+ spin_lock_irqsave(&m->lock, flags);
+
+ /* Guess which priority_group will be used at next mapping time */
+ if (unlikely(!m->current_pgpath && m->next_pg))
+ pg = m->next_pg;
+ else if (likely(m->current_pg))
+ pg = m->current_pg;
+ else
+ /*
+ * We don't know which pg will be used at next mapping time.
+ * We don't call __choose_pgpath() here to avoid to trigger
+ * pg_init just by busy checking.
+ * So we don't know whether underlying devices we will be using
+ * at next mapping time are busy or not. Just try mapping.
+ */
+ goto out;
+
+ /*
+ * If there is one non-busy active path at least, the path selector
+ * will be able to select it. So we consider such a pg as not busy.
+ */
+ busy = 1;
+ list_for_each_entry(pgpath, &pg->pgpaths, list)
+ if (pgpath->is_active) {
+ has_active = 1;
+
+ if (!__pgpath_busy(pgpath)) {
+ busy = 0;
+ break;
+ }
+ }
+
+ if (!has_active)
+ /*
+ * No active path in this pg, so this pg won't be used and
+ * the current_pg will be changed at next mapping time.
+ * We need to try mapping to determine it.
+ */
+ busy = 0;
+
+out:
+ spin_unlock_irqrestore(&m->lock, flags);
+
+ return busy;
+}
+
/*-----------------------------------------------------------------
* Module setup
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 0, 5},
+ .version = {1, 1, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
- .map = multipath_map,
- .end_io = multipath_end_io,
+ .map_rq = multipath_map,
+ .rq_end_io = multipath_end_io,
.presuspend = multipath_presuspend,
.resume = multipath_resume,
.status = multipath_status,
.message = multipath_message,
.ioctl = multipath_ioctl,
+ .iterate_devices = multipath_iterate_devices,
+ .busy = multipath_busy,
};
static int __init dm_multipath_init(void)
diff --git a/drivers/md/dm-path-selector.h b/drivers/md/dm-path-selector.h
index 27357b8..e7d1fa8 100644
--- a/drivers/md/dm-path-selector.h
+++ b/drivers/md/dm-path-selector.h
@@ -56,7 +56,8 @@ struct path_selector_type {
* the path fails.
*/
struct dm_path *(*select_path) (struct path_selector *ps,
- unsigned *repeat_count);
+ unsigned *repeat_count,
+ size_t nr_bytes);
/*
* Notify the selector that a path has failed.
@@ -75,7 +76,10 @@ struct path_selector_type {
int (*status) (struct path_selector *ps, struct dm_path *path,
status_type_t type, char *result, unsigned int maxlen);
- int (*end_io) (struct path_selector *ps, struct dm_path *path);
+ int (*start_io) (struct path_selector *ps, struct dm_path *path,
+ size_t nr_bytes);
+ int (*end_io) (struct path_selector *ps, struct dm_path *path,
+ size_t nr_bytes);
};
/* Register a path selector */
diff --git a/drivers/md/dm-queue-length.c b/drivers/md/dm-queue-length.c
new file mode 100644
index 0000000..f92b6ce
--- /dev/null
+++ b/drivers/md/dm-queue-length.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright (C) 2004-2005 IBM Corp. All Rights Reserved.
+ * Copyright (C) 2006-2009 NEC Corporation.
+ *
+ * dm-queue-length.c
+ *
+ * Module Author: Stefan Bader, IBM
+ * Modified by: Kiyoshi Ueda, NEC
+ *
+ * This file is released under the GPL.
+ *
+ * queue-length path selector - choose a path with the least number of
+ * in-flight I/Os.
+ */
+
+#include "dm.h"
+#include "dm-path-selector.h"
+
+#include <linux/slab.h>
+#include <linux/ctype.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <asm/atomic.h>
+
+#define DM_MSG_PREFIX "multipath queue-length"
+#define QL_MIN_IO 128
+#define QL_VERSION "0.1.0"
+
+struct selector {
+ struct list_head valid_paths;
+ struct list_head failed_paths;
+};
+
+struct path_info {
+ struct list_head list;
+ struct dm_path *path;
+ unsigned repeat_count;
+ atomic_t qlen; /* the number of in-flight I/Os */
+};
+
+static struct selector *alloc_selector(void)
+{
+ struct selector *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (s) {
+ INIT_LIST_HEAD(&s->valid_paths);
+ INIT_LIST_HEAD(&s->failed_paths);
+ }
+
+ return s;
+}
+
+static int ql_create(struct path_selector *ps, unsigned argc, char **argv)
+{
+ struct selector *s = alloc_selector();
+
+ if (!s)
+ return -ENOMEM;
+
+ ps->context = s;
+ return 0;
+}
+
+static void ql_free_paths(struct list_head *paths)
+{
+ struct path_info *pi, *next;
+
+ list_for_each_entry_safe(pi, next, paths, list) {
+ list_del(&pi->list);
+ kfree(pi);
+ }
+}
+
+static void ql_destroy(struct path_selector *ps)
+{
+ struct selector *s = ps->context;
+
+ ql_free_paths(&s->valid_paths);
+ ql_free_paths(&s->failed_paths);
+ kfree(s);
+ ps->context = NULL;
+}
+
+static int ql_status(struct path_selector *ps, struct dm_path *path,
+ status_type_t type, char *result, unsigned maxlen)
+{
+ unsigned sz = 0;
+ struct path_info *pi;
+
+ /* When called with NULL path, return selector status/args. */
+ if (!path)
+ DMEMIT("0 ");
+ else {
+ pi = path->pscontext;
+
+ switch (type) {
+ case STATUSTYPE_INFO:
+ DMEMIT("%d ", atomic_read(&pi->qlen));
+ break;
+ case STATUSTYPE_TABLE:
+ DMEMIT("%u ", pi->repeat_count);
+ break;
+ }
+ }
+
+ return sz;
+}
+
+static int ql_add_path(struct path_selector *ps, struct dm_path *path,
+ int argc, char **argv, char **error)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi;
+ unsigned repeat_count = QL_MIN_IO;
+
+ /*
+ * Arguments: [<repeat_count>]
+ * <repeat_count>: The number of I/Os before switching path.
+ * If not given, default (QL_MIN_IO) is used.
+ */
+ if (argc > 1) {
+ *error = "queue-length ps: incorrect number of arguments";
+ return -EINVAL;
+ }
+
+ if ((argc == 1) && (sscanf(argv[0], "%u", &repeat_count) != 1)) {
+ *error = "queue-length ps: invalid repeat count";
+ return -EINVAL;
+ }
+
+ /* Allocate the path information structure */
+ pi = kmalloc(sizeof(*pi), GFP_KERNEL);
+ if (!pi) {
+ *error = "queue-length ps: Error allocating path information";
+ return -ENOMEM;
+ }
+
+ pi->path = path;
+ pi->repeat_count = repeat_count;
+ atomic_set(&pi->qlen, 0);
+
+ path->pscontext = pi;
+
+ list_add_tail(&pi->list, &s->valid_paths);
+
+ return 0;
+}
+
+static void ql_fail_path(struct path_selector *ps, struct dm_path *path)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi = path->pscontext;
+
+ list_move(&pi->list, &s->failed_paths);
+}
+
+static int ql_reinstate_path(struct path_selector *ps, struct dm_path *path)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi = path->pscontext;
+
+ list_move_tail(&pi->list, &s->valid_paths);
+
+ return 0;
+}
+
+/*
+ * Select a path having the minimum number of in-flight I/Os
+ */
+static struct dm_path *ql_select_path(struct path_selector *ps,
+ unsigned *repeat_count, size_t nr_bytes)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi = NULL, *best = NULL;
+
+ if (list_empty(&s->valid_paths))
+ return NULL;
+
+ /* Change preferred (first in list) path to evenly balance. */
+ list_move_tail(s->valid_paths.next, &s->valid_paths);
+
+ list_for_each_entry(pi, &s->valid_paths, list) {
+ if (!best ||
+ (atomic_read(&pi->qlen) < atomic_read(&best->qlen)))
+ best = pi;
+
+ if (!atomic_read(&best->qlen))
+ break;
+ }
+
+ if (!best)
+ return NULL;
+
+ *repeat_count = best->repeat_count;
+
+ return best->path;
+}
+
+static int ql_start_io(struct path_selector *ps, struct dm_path *path,
+ size_t nr_bytes)
+{
+ struct path_info *pi = path->pscontext;
+
+ atomic_inc(&pi->qlen);
+
+ return 0;
+}
+
+static int ql_end_io(struct path_selector *ps, struct dm_path *path,
+ size_t nr_bytes)
+{
+ struct path_info *pi = path->pscontext;
+
+ atomic_dec(&pi->qlen);
+
+ return 0;
+}
+
+static struct path_selector_type ql_ps = {
+ .name = "queue-length",
+ .module = THIS_MODULE,
+ .table_args = 1,
+ .info_args = 1,
+ .create = ql_create,
+ .destroy = ql_destroy,
+ .status = ql_status,
+ .add_path = ql_add_path,
+ .fail_path = ql_fail_path,
+ .reinstate_path = ql_reinstate_path,
+ .select_path = ql_select_path,
+ .start_io = ql_start_io,
+ .end_io = ql_end_io,
+};
+
+static int __init dm_ql_init(void)
+{
+ int r = dm_register_path_selector(&ql_ps);
+
+ if (r < 0)
+ DMERR("register failed %d", r);
+
+ DMINFO("version " QL_VERSION " loaded");
+
+ return r;
+}
+
+static void __exit dm_ql_exit(void)
+{
+ int r = dm_unregister_path_selector(&ql_ps);
+
+ if (r < 0)
+ DMERR("unregister failed %d", r);
+}
+
+module_init(dm_ql_init);
+module_exit(dm_ql_exit);
+
+MODULE_AUTHOR("Stefan Bader <Stefan.Bader at de.ibm.com>");
+MODULE_DESCRIPTION(
+ "(C) Copyright IBM Corp. 2004,2005 All Rights Reserved.\n"
+ DM_NAME " path selector to balance the number of in-flight I/Os"
+);
+MODULE_LICENSE("GPL");
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 076fbb4..ce8868c 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1283,9 +1283,23 @@ static int mirror_status(struct dm_target *ti, status_type_t type,
return 0;
}
+static int mirror_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct mirror_set *ms = ti->private;
+ int ret = 0;
+ unsigned i;
+
+ for (i = 0; !ret && i < ms->nr_mirrors; i++)
+ ret = fn(ti, ms->mirror[i].dev,
+ ms->mirror[i].offset, data);
+
+ return ret;
+}
+
static struct target_type mirror_target = {
.name = "mirror",
- .version = {1, 0, 20},
+ .version = {1, 12, 0},
.module = THIS_MODULE,
.ctr = mirror_ctr,
.dtr = mirror_dtr,
@@ -1295,6 +1309,7 @@ static struct target_type mirror_target = {
.postsuspend = mirror_postsuspend,
.resume = mirror_resume,
.status = mirror_status,
+ .iterate_devices = mirror_iterate_devices,
};
static int __init dm_mirror_init(void)
diff --git a/drivers/md/dm-region-hash.c b/drivers/md/dm-region-hash.c
index 7b899be..36dbe29 100644
--- a/drivers/md/dm-region-hash.c
+++ b/drivers/md/dm-region-hash.c
@@ -283,7 +283,7 @@ static struct dm_region *__rh_alloc(struct dm_region_hash *rh, region_t region)
nreg = mempool_alloc(rh->region_pool, GFP_ATOMIC);
if (unlikely(!nreg))
- nreg = kmalloc(sizeof(*nreg), GFP_NOIO);
+ nreg = kmalloc(sizeof(*nreg), GFP_NOIO | __GFP_NOFAIL);
nreg->state = rh->log->type->in_sync(rh->log, region, 1) ?
DM_RH_CLEAN : DM_RH_NOSYNC;
diff --git a/drivers/md/dm-round-robin.c b/drivers/md/dm-round-robin.c
index cdfbf65..24752f4 100644
--- a/drivers/md/dm-round-robin.c
+++ b/drivers/md/dm-round-robin.c
@@ -161,7 +161,7 @@ static int rr_reinstate_path(struct path_selector *ps, struct dm_path *p)
}
static struct dm_path *rr_select_path(struct path_selector *ps,
- unsigned *repeat_count)
+ unsigned *repeat_count, size_t nr_bytes)
{
struct selector *s = (struct selector *) ps->context;
struct path_info *pi = NULL;
diff --git a/drivers/md/dm-service-time.c b/drivers/md/dm-service-time.c
new file mode 100644
index 0000000..cfa668f
--- /dev/null
+++ b/drivers/md/dm-service-time.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2007-2009 NEC Corporation. All Rights Reserved.
+ *
+ * Module Author: Kiyoshi Ueda
+ *
+ * This file is released under the GPL.
+ *
+ * Throughput oriented path selector.
+ */
+
+#include "dm.h"
+#include "dm-path-selector.h"
+
+#define DM_MSG_PREFIX "multipath service-time"
+#define ST_MIN_IO 1
+#define ST_MAX_RELATIVE_THROUGHPUT 100
+#define ST_MAX_RELATIVE_THROUGHPUT_SHIFT 7
+#define ST_MAX_INFLIGHT_SIZE ((size_t)-1 >> ST_MAX_RELATIVE_THROUGHPUT_SHIFT)
+#define ST_VERSION "0.2.0"
+
+struct selector {
+ struct list_head valid_paths;
+ struct list_head failed_paths;
+};
+
+struct path_info {
+ struct list_head list;
+ struct dm_path *path;
+ unsigned repeat_count;
+ unsigned relative_throughput;
+ atomic_t in_flight_size; /* Total size of in-flight I/Os */
+};
+
+static struct selector *alloc_selector(void)
+{
+ struct selector *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (s) {
+ INIT_LIST_HEAD(&s->valid_paths);
+ INIT_LIST_HEAD(&s->failed_paths);
+ }
+
+ return s;
+}
+
+static int st_create(struct path_selector *ps, unsigned argc, char **argv)
+{
+ struct selector *s = alloc_selector();
+
+ if (!s)
+ return -ENOMEM;
+
+ ps->context = s;
+ return 0;
+}
+
+static void free_paths(struct list_head *paths)
+{
+ struct path_info *pi, *next;
+
+ list_for_each_entry_safe(pi, next, paths, list) {
+ list_del(&pi->list);
+ kfree(pi);
+ }
+}
+
+static void st_destroy(struct path_selector *ps)
+{
+ struct selector *s = ps->context;
+
+ free_paths(&s->valid_paths);
+ free_paths(&s->failed_paths);
+ kfree(s);
+ ps->context = NULL;
+}
+
+static int st_status(struct path_selector *ps, struct dm_path *path,
+ status_type_t type, char *result, unsigned maxlen)
+{
+ unsigned sz = 0;
+ struct path_info *pi;
+
+ if (!path)
+ DMEMIT("0 ");
+ else {
+ pi = path->pscontext;
+
+ switch (type) {
+ case STATUSTYPE_INFO:
+ DMEMIT("%d %u ", atomic_read(&pi->in_flight_size),
+ pi->relative_throughput);
+ break;
+ case STATUSTYPE_TABLE:
+ DMEMIT("%u %u ", pi->repeat_count,
+ pi->relative_throughput);
+ break;
+ }
+ }
+
+ return sz;
+}
+
+static int st_add_path(struct path_selector *ps, struct dm_path *path,
+ int argc, char **argv, char **error)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi;
+ unsigned repeat_count = ST_MIN_IO;
+ unsigned relative_throughput = 1;
+
+ /*
+ * Arguments: [<repeat_count> [<relative_throughput>]]
+ * <repeat_count>: The number of I/Os before switching path.
+ * If not given, default (ST_MIN_IO) is used.
+ * <relative_throughput>: The relative throughput value of
+ * the path among all paths in the path-group.
+ * The valid range: 0-<ST_MAX_RELATIVE_THROUGHPUT>
+ * If not given, minimum value '1' is used.
+ * If '0' is given, the path isn't selected while
+ * other paths having a positive value are
+ * available.
+ */
+ if (argc > 2) {
+ *error = "service-time ps: incorrect number of arguments";
+ return -EINVAL;
+ }
+
+ if (argc && (sscanf(argv[0], "%u", &repeat_count) != 1)) {
+ *error = "service-time ps: invalid repeat count";
+ return -EINVAL;
+ }
+
+ if ((argc == 2) &&
+ (sscanf(argv[1], "%u", &relative_throughput) != 1 ||
+ relative_throughput > ST_MAX_RELATIVE_THROUGHPUT)) {
+ *error = "service-time ps: invalid relative_throughput value";
+ return -EINVAL;
+ }
+
+ /* allocate the path */
+ pi = kmalloc(sizeof(*pi), GFP_KERNEL);
+ if (!pi) {
+ *error = "service-time ps: Error allocating path context";
+ return -ENOMEM;
+ }
+
+ pi->path = path;
+ pi->repeat_count = repeat_count;
+ pi->relative_throughput = relative_throughput;
+ atomic_set(&pi->in_flight_size, 0);
+
+ path->pscontext = pi;
+
+ list_add_tail(&pi->list, &s->valid_paths);
+
+ return 0;
+}
+
+static void st_fail_path(struct path_selector *ps, struct dm_path *path)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi = path->pscontext;
+
+ list_move(&pi->list, &s->failed_paths);
+}
+
+static int st_reinstate_path(struct path_selector *ps, struct dm_path *path)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi = path->pscontext;
+
+ list_move_tail(&pi->list, &s->valid_paths);
+
+ return 0;
+}
+
+/*
+ * Compare the estimated service time of 2 paths, pi1 and pi2,
+ * for the incoming I/O.
+ *
+ * Returns:
+ * < 0 : pi1 is better
+ * 0 : no difference between pi1 and pi2
+ * > 0 : pi2 is better
+ *
+ * Description:
+ * Basically, the service time is estimated by:
+ * ('pi->in-flight-size' + 'incoming') / 'pi->relative_throughput'
+ * To reduce the calculation, some optimizations are made.
+ * (See comments inline)
+ */
+static int st_compare_load(struct path_info *pi1, struct path_info *pi2,
+ size_t incoming)
+{
+ size_t sz1, sz2, st1, st2;
+
+ sz1 = atomic_read(&pi1->in_flight_size);
+ sz2 = atomic_read(&pi2->in_flight_size);
+
+ /*
+ * Case 1: Both have same throughput value. Choose less loaded path.
+ */
+ if (pi1->relative_throughput == pi2->relative_throughput)
+ return sz1 - sz2;
+
+ /*
+ * Case 2a: Both have same load. Choose higher throughput path.
+ * Case 2b: One path has no throughput value. Choose the other one.
+ */
+ if (sz1 == sz2 ||
+ !pi1->relative_throughput || !pi2->relative_throughput)
+ return pi2->relative_throughput - pi1->relative_throughput;
+
+ /*
+ * Case 3: Calculate service time. Choose faster path.
+ * Service time using pi1:
+ * st1 = (sz1 + incoming) / pi1->relative_throughput
+ * Service time using pi2:
+ * st2 = (sz2 + incoming) / pi2->relative_throughput
+ *
+ * To avoid the division, transform the expression to use
+ * multiplication.
+ * Because ->relative_throughput > 0 here, if st1 < st2,
+ * the expressions below are the same meaning:
+ * (sz1 + incoming) / pi1->relative_throughput <
+ * (sz2 + incoming) / pi2->relative_throughput
+ * (sz1 + incoming) * pi2->relative_throughput <
+ * (sz2 + incoming) * pi1->relative_throughput
+ * So use the later one.
+ */
+ sz1 += incoming;
+ sz2 += incoming;
+ if (unlikely(sz1 >= ST_MAX_INFLIGHT_SIZE ||
+ sz2 >= ST_MAX_INFLIGHT_SIZE)) {
+ /*
+ * Size may be too big for multiplying pi->relative_throughput
+ * and overflow.
+ * To avoid the overflow and mis-selection, shift down both.
+ */
+ sz1 >>= ST_MAX_RELATIVE_THROUGHPUT_SHIFT;
+ sz2 >>= ST_MAX_RELATIVE_THROUGHPUT_SHIFT;
+ }
+ st1 = sz1 * pi2->relative_throughput;
+ st2 = sz2 * pi1->relative_throughput;
+ if (st1 != st2)
+ return st1 - st2;
+
+ /*
+ * Case 4: Service time is equal. Choose higher throughput path.
+ */
+ return pi2->relative_throughput - pi1->relative_throughput;
+}
+
+static struct dm_path *st_select_path(struct path_selector *ps,
+ unsigned *repeat_count, size_t nr_bytes)
+{
+ struct selector *s = ps->context;
+ struct path_info *pi = NULL, *best = NULL;
+
+ if (list_empty(&s->valid_paths))
+ return NULL;
+
+ /* Change preferred (first in list) path to evenly balance. */
+ list_move_tail(s->valid_paths.next, &s->valid_paths);
+
+ list_for_each_entry(pi, &s->valid_paths, list)
+ if (!best || (st_compare_load(pi, best, nr_bytes) < 0))
+ best = pi;
+
+ if (!best)
+ return NULL;
+
+ *repeat_count = best->repeat_count;
+
+ return best->path;
+}
+
+static int st_start_io(struct path_selector *ps, struct dm_path *path,
+ size_t nr_bytes)
+{
+ struct path_info *pi = path->pscontext;
+
+ atomic_add(nr_bytes, &pi->in_flight_size);
+
+ return 0;
+}
+
+static int st_end_io(struct path_selector *ps, struct dm_path *path,
+ size_t nr_bytes)
+{
+ struct path_info *pi = path->pscontext;
+
+ atomic_sub(nr_bytes, &pi->in_flight_size);
+
+ return 0;
+}
+
+static struct path_selector_type st_ps = {
+ .name = "service-time",
+ .module = THIS_MODULE,
+ .table_args = 2,
+ .info_args = 2,
+ .create = st_create,
+ .destroy = st_destroy,
+ .status = st_status,
+ .add_path = st_add_path,
+ .fail_path = st_fail_path,
+ .reinstate_path = st_reinstate_path,
+ .select_path = st_select_path,
+ .start_io = st_start_io,
+ .end_io = st_end_io,
+};
+
+static int __init dm_st_init(void)
+{
+ int r = dm_register_path_selector(&st_ps);
+
+ if (r < 0)
+ DMERR("register failed %d", r);
+
+ DMINFO("version " ST_VERSION " loaded");
+
+ return r;
+}
+
+static void __exit dm_st_exit(void)
+{
+ int r = dm_unregister_path_selector(&st_ps);
+
+ if (r < 0)
+ DMERR("unregister failed %d", r);
+}
+
+module_init(dm_st_init);
+module_exit(dm_st_exit);
+
+MODULE_DESCRIPTION(DM_NAME " throughput oriented path selector");
+MODULE_AUTHOR("Kiyoshi Ueda <k-ueda@ct.jp.nec.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index e75c6dd..6e3fe4f 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -282,7 +282,7 @@ static int read_header(struct pstore *ps, int *new_snapshot)
*/
if (!ps->store->chunk_size) {
ps->store->chunk_size = max(DM_CHUNK_SIZE_DEFAULT_SECTORS,
- bdev_hardsect_size(ps->store->cow->bdev) >> 9);
+ bdev_logical_block_size(ps->store->cow->bdev) >> 9);
ps->store->chunk_mask = ps->store->chunk_size - 1;
ps->store->chunk_shift = ffs(ps->store->chunk_size) - 1;
chunk_size_supplied = 0;
@@ -636,7 +636,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
/*
* Commit exceptions to disk.
*/
- if (ps->valid && area_io(ps, WRITE))
+ if (ps->valid && area_io(ps, WRITE_BARRIER))
ps->valid = 0;
/*
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index d73f17f..d573165 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -678,6 +678,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ti->private = s;
ti->split_io = s->store->chunk_size;
+ ti->num_flush_requests = 1;
return 0;
@@ -1030,6 +1031,11 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio,
chunk_t chunk;
struct dm_snap_pending_exception *pe = NULL;
+ if (unlikely(bio_empty_barrier(bio))) {
+ bio->bi_bdev = s->store->cow->bdev;
+ return DM_MAPIO_REMAPPED;
+ }
+
chunk = sector_to_chunk(s->store, bio->bi_sector);
/* Full snapshots are not usable */
@@ -1338,6 +1344,8 @@ static int origin_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
ti->private = dev;
+ ti->num_flush_requests = 1;
+
return 0;
}
@@ -1353,6 +1361,9 @@ static int origin_map(struct dm_target *ti, struct bio *bio,
struct dm_dev *dev = ti->private;
bio->bi_bdev = dev->bdev;
+ if (unlikely(bio_empty_barrier(bio)))
+ return DM_MAPIO_REMAPPED;
+
/* Only tell snapshots if this is a write */
return (bio_rw(bio) == WRITE) ? do_origin(dev, bio) : DM_MAPIO_REMAPPED;
}
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 41569bc..b240e85 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -167,6 +167,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
sc->stripes = stripes;
sc->stripe_width = width;
ti->split_io = chunk_size;
+ ti->num_flush_requests = stripes;
sc->chunk_mask = ((sector_t) chunk_size) - 1;
for (sc->chunk_shift = 0; chunk_size; sc->chunk_shift++)
@@ -211,10 +212,18 @@ static int stripe_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
struct stripe_c *sc = (struct stripe_c *) ti->private;
+ sector_t offset, chunk;
+ uint32_t stripe;
- sector_t offset = bio->bi_sector - ti->begin;
- sector_t chunk = offset >> sc->chunk_shift;
- uint32_t stripe = sector_div(chunk, sc->stripes);
+ if (unlikely(bio_empty_barrier(bio))) {
+ BUG_ON(map_context->flush_request >= sc->stripes);
+ bio->bi_bdev = sc->stripe[map_context->flush_request].dev->bdev;
+ return DM_MAPIO_REMAPPED;
+ }
+
+ offset = bio->bi_sector - ti->begin;
+ chunk = offset >> sc->chunk_shift;
+ stripe = sector_div(chunk, sc->stripes);
bio->bi_bdev = sc->stripe[stripe].dev->bdev;
bio->bi_sector = sc->stripe[stripe].physical_start +
@@ -304,15 +313,31 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio,
return error;
}
+static int stripe_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct stripe_c *sc = ti->private;
+ int ret = 0;
+ unsigned i = 0;
+
+ do
+ ret = fn(ti, sc->stripe[i].dev,
+ sc->stripe[i].physical_start, data);
+ while (!ret && ++i < sc->stripes);
+
+ return ret;
+}
+
static struct target_type stripe_target = {
.name = "striped",
- .version = {1, 1, 0},
+ .version = {1, 2, 0},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
.map = stripe_map,
.end_io = stripe_end_io,
.status = stripe_status,
+ .iterate_devices = stripe_iterate_devices,
};
int __init dm_stripe_init(void)
diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c
index a2a45e6..4b04590 100644
--- a/drivers/md/dm-sysfs.c
+++ b/drivers/md/dm-sysfs.c
@@ -57,12 +57,21 @@ static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
return strlen(buf);
}
+static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
+{
+ sprintf(buf, "%d\n", dm_suspended(md));
+
+ return strlen(buf);
+}
+
static DM_ATTR_RO(name);
static DM_ATTR_RO(uuid);
+static DM_ATTR_RO(suspended);
static struct attribute *dm_attrs[] = {
&dm_attr_name.attr,
&dm_attr_uuid.attr,
+ &dm_attr_suspended.attr,
NULL,
};
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 429b50b..4899ebe 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -41,6 +41,7 @@
struct dm_table {
struct mapped_device *md;
atomic_t holders;
+ unsigned type;
/* btree table */
unsigned int depth;
@@ -62,15 +63,11 @@ struct dm_table {
/* a list of devices used by this table */
struct list_head devices;
- /*
- * These are optimistic limits taken from all the
- * targets, some targets will need smaller limits.
- */
- struct io_restrictions limits;
-
/* events get handed up using this callback */
void (*event_fn)(void *);
void *event_context;
+
+ struct dm_md_mempools *mempools;
};
/*
@@ -89,42 +86,6 @@ static unsigned int int_log(unsigned int n, unsigned int base)
}
/*
- * Returns the minimum that is _not_ zero, unless both are zero.
- */
-#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
-
-/*
- * Combine two io_restrictions, always taking the lower value.
- */
-static void combine_restrictions_low(struct io_restrictions *lhs,
- struct io_restrictions *rhs)
-{
- lhs->max_sectors =
- min_not_zero(lhs->max_sectors, rhs->max_sectors);
-
- lhs->max_phys_segments =
- min_not_zero(lhs->max_phys_segments, rhs->max_phys_segments);
-
- lhs->max_hw_segments =
- min_not_zero(lhs->max_hw_segments, rhs->max_hw_segments);
-
- lhs->hardsect_size = max(lhs->hardsect_size, rhs->hardsect_size);
-
- lhs->max_segment_size =
- min_not_zero(lhs->max_segment_size, rhs->max_segment_size);
-
- lhs->max_hw_sectors =
- min_not_zero(lhs->max_hw_sectors, rhs->max_hw_sectors);
-
- lhs->seg_boundary_mask =
- min_not_zero(lhs->seg_boundary_mask, rhs->seg_boundary_mask);
-
- lhs->bounce_pfn = min_not_zero(lhs->bounce_pfn, rhs->bounce_pfn);
-
- lhs->no_cluster |= rhs->no_cluster;
-}
-
-/*
* Calculate the index of the child node of the n'th node k'th key.
*/
static inline unsigned int get_child(unsigned int n, unsigned int k)
@@ -266,6 +227,8 @@ static void free_devices(struct list_head *devices)
list_for_each_safe(tmp, next, devices) {
struct dm_dev_internal *dd =
list_entry(tmp, struct dm_dev_internal, list);
+ DMWARN("dm_table_destroy: dm_put_device call missing for %s",
+ dd->dm_dev.name);
kfree(dd);
}
}
@@ -295,12 +258,10 @@ void dm_table_destroy(struct dm_table *t)
vfree(t->highs);
/* free the device list */
- if (t->devices.next != &t->devices) {
- DMWARN("devices still present during destroy: "
- "dm_table_remove_device calls missing");
-
+ if (t->devices.next != &t->devices)
free_devices(&t->devices);
- }
+
+ dm_free_md_mempools(t->mempools);
kfree(t);
}
@@ -384,15 +345,48 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
/*
* If possible, this checks an area of a destination device is valid.
*/
-static int check_device_area(struct dm_dev_internal *dd, sector_t start,
- sector_t len)
+static int device_area_is_valid(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, void *data)
{
- sector_t dev_size = dd->dm_dev.bdev->bd_inode->i_size >> SECTOR_SHIFT;
+ struct queue_limits *limits = data;
+ struct block_device *bdev = dev->bdev;
+ sector_t dev_size =
+ i_size_read(bdev->bd_inode) >> SECTOR_SHIFT;
+ unsigned short logical_block_size_sectors =
+ limits->logical_block_size >> SECTOR_SHIFT;
+ char b[BDEVNAME_SIZE];
if (!dev_size)
return 1;
- return ((start < dev_size) && (len <= (dev_size - start)));
+ if ((start >= dev_size) || (start + ti->len > dev_size)) {
+ DMWARN("%s: %s too small for target",
+ dm_device_name(ti->table->md), bdevname(bdev, b));
+ return 0;
+ }
+
+ if (logical_block_size_sectors <= 1)
+ return 1;
+
+ if (start & (logical_block_size_sectors - 1)) {
+ DMWARN("%s: start=%llu not aligned to h/w "
+ "logical block size %hu of %s",
+ dm_device_name(ti->table->md),
+ (unsigned long long)start,
+ limits->logical_block_size, bdevname(bdev, b));
+ return 0;
+ }
+
+ if (ti->len & (logical_block_size_sectors - 1)) {
+ DMWARN("%s: len=%llu not aligned to h/w "
+ "logical block size %hu of %s",
+ dm_device_name(ti->table->md),
+ (unsigned long long)ti->len,
+ limits->logical_block_size, bdevname(bdev, b));
+ return 0;
+ }
+
+ return 1;
}
/*
@@ -478,38 +472,32 @@ static int __table_get_device(struct dm_table *t, struct dm_target *ti,
}
atomic_inc(&dd->count);
- if (!check_device_area(dd, start, len)) {
- DMWARN("device %s too small for target", path);
- dm_put_device(ti, &dd->dm_dev);
- return -EINVAL;
- }
-
*result = &dd->dm_dev;
-
return 0;
}
-void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
+/*
+ * Returns the minimum that is _not_ zero, unless both are zero.
+ */
+#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
+
+int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, void *data)
{
+ struct queue_limits *limits = data;
+ struct block_device *bdev = dev->bdev;
struct request_queue *q = bdev_get_queue(bdev);
- struct io_restrictions *rs = &ti->limits;
char b[BDEVNAME_SIZE];
if (unlikely(!q)) {
DMWARN("%s: Cannot set limits for nonexistent device %s",
dm_device_name(ti->table->md), bdevname(bdev, b));
- return;
+ return 0;
}
- /*
- * Combine the device limits low.
- *
- * FIXME: if we move an io_restriction struct
- * into q this would just be a call to
- * combine_restrictions_low()
- */
- rs->max_sectors =
- min_not_zero(rs->max_sectors, q->max_sectors);
+ if (blk_stack_limits(limits, &q->limits, start) < 0)
+ DMWARN("%s: target device %s is misaligned",
+ dm_device_name(ti->table->md), bdevname(bdev, b));
/*
* Check if merge fn is supported.
@@ -518,47 +506,21 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
*/
if (q->merge_bvec_fn && !ti->type->merge)
- rs->max_sectors =
- min_not_zero(rs->max_sectors,
+ limits->max_sectors =
+ min_not_zero(limits->max_sectors,
(unsigned int) (PAGE_SIZE >> 9));
-
- rs->max_phys_segments =
- min_not_zero(rs->max_phys_segments,
- q->max_phys_segments);
-
- rs->max_hw_segments =
- min_not_zero(rs->max_hw_segments, q->max_hw_segments);
-
- rs->hardsect_size = max(rs->hardsect_size, q->hardsect_size);
-
- rs->max_segment_size =
- min_not_zero(rs->max_segment_size, q->max_segment_size);
-
- rs->max_hw_sectors =
- min_not_zero(rs->max_hw_sectors, q->max_hw_sectors);
-
- rs->seg_boundary_mask =
- min_not_zero(rs->seg_boundary_mask,
- q->seg_boundary_mask);
-
- rs->bounce_pfn = min_not_zero(rs->bounce_pfn, q->bounce_pfn);
-
- rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
+ return 0;
}
EXPORT_SYMBOL_GPL(dm_set_device_limits);
int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
sector_t len, fmode_t mode, struct dm_dev **result)
{
- int r = __table_get_device(ti->table, ti, path,
- start, len, mode, result);
-
- if (!r)
- dm_set_device_limits(ti, (*result)->bdev);
-
- return r;
+ return __table_get_device(ti->table, ti, path,
+ start, len, mode, result);
}
+
/*
* Decrement a devices use count and remove it if necessary.
*/
@@ -673,24 +635,78 @@ int dm_split_args(int *argc, char ***argvp, char *input)
return 0;
}
-static void check_for_valid_limits(struct io_restrictions *rs)
+/*
+ * Impose necessary and sufficient conditions on a devices's table such
+ * that any incoming bio which respects its logical_block_size can be
+ * processed successfully. If it falls across the boundary between
+ * two or more targets, the size of each piece it gets split into must
+ * be compatible with the logical_block_size of the target processing it.
+ */
+static int validate_hardware_logical_block_alignment(struct dm_table *table,
+ struct queue_limits *limits)
{
- if (!rs->max_sectors)
- rs->max_sectors = SAFE_MAX_SECTORS;
- if (!rs->max_hw_sectors)
- rs->max_hw_sectors = SAFE_MAX_SECTORS;
- if (!rs->max_phys_segments)
- rs->max_phys_segments = MAX_PHYS_SEGMENTS;
- if (!rs->max_hw_segments)
- rs->max_hw_segments = MAX_HW_SEGMENTS;
- if (!rs->hardsect_size)
- rs->hardsect_size = 1 << SECTOR_SHIFT;
- if (!rs->max_segment_size)
- rs->max_segment_size = MAX_SEGMENT_SIZE;
- if (!rs->seg_boundary_mask)
- rs->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
- if (!rs->bounce_pfn)
- rs->bounce_pfn = -1;
+ /*
+ * This function uses arithmetic modulo the logical_block_size
+ * (in units of 512-byte sectors).
+ */
+ unsigned short device_logical_block_size_sects =
+ limits->logical_block_size >> SECTOR_SHIFT;
+
+ /*
+ * Offset of the start of the next table entry, mod logical_block_size.
+ */
+ unsigned short next_target_start = 0;
+
+ /*
+ * Given an aligned bio that extends beyond the end of a
+ * target, how many sectors must the next target handle?
+ */
+ unsigned short remaining = 0;
+
+ struct dm_target *uninitialized_var(ti);
+ struct queue_limits ti_limits;
+ unsigned i = 0;
+
+ /*
+ * Check each entry in the table in turn.
+ */
+ while (i < dm_table_get_num_targets(table)) {
+ ti = dm_table_get_target(table, i++);
+
+ blk_set_default_limits(&ti_limits);
+
+ /* combine all target devices' limits */
+ if (ti->type->iterate_devices)
+ ti->type->iterate_devices(ti, dm_set_device_limits,
+ &ti_limits);
+
+ /*
+ * If the remaining sectors fall entirely within this
+ * table entry are they compatible with its logical_block_size?
+ */
+ if (remaining < ti->len &&
+ remaining & ((ti_limits.logical_block_size >>
+ SECTOR_SHIFT) - 1))
+ break; /* Error */
+
+ next_target_start =
+ (unsigned short) ((next_target_start + ti->len) &
+ (device_logical_block_size_sects - 1));
+ remaining = next_target_start ?
+ device_logical_block_size_sects - next_target_start : 0;
+ }
+
+ if (remaining) {
+ DMWARN("%s: table line %u (start sect %llu len %llu) "
+ "not aligned to h/w logical block size %hu",
+ dm_device_name(table->md), i,
+ (unsigned long long) ti->begin,
+ (unsigned long long) ti->len,
+ limits->logical_block_size);
+ return -EINVAL;
+ }
+
+ return 0;
}
int dm_table_add_target(struct dm_table *t, const char *type,
@@ -745,9 +761,6 @@ int dm_table_add_target(struct dm_table *t, const char *type,
t->highs[t->num_targets++] = tgt->begin + tgt->len - 1;
- /* FIXME: the plan is to combine high here and then have
- * the merge fn apply the target level restrictions. */
- combine_restrictions_low(&t->limits, &tgt->limits);
return 0;
bad:
@@ -756,6 +769,104 @@ int dm_table_add_target(struct dm_table *t, const char *type,
return r;
}
+int dm_table_set_type(struct dm_table *t)
+{
+ unsigned i;
+ unsigned bio_based = 0, request_based = 0;
+ struct dm_target *tgt;
+ struct dm_dev_internal *dd;
+ struct list_head *devices;
+
+ for (i = 0; i < t->num_targets; i++) {
+ tgt = t->targets + i;
+ if (dm_target_request_based(tgt))
+ request_based = 1;
+ else
+ bio_based = 1;
+
+ if (bio_based && request_based) {
+ DMWARN("Inconsistent table: different target types"
+ " can't be mixed up");
+ return -EINVAL;
+ }
+ }
+
+ if (bio_based) {
+ /* We must use this table as bio-based */
+ t->type = DM_TYPE_BIO_BASED;
+ return 0;
+ }
+
+ BUG_ON(!request_based); /* No targets in this table */
+
+ /* Non-request-stackable devices can't be used for request-based dm */
+ devices = dm_table_get_devices(t);
+ list_for_each_entry(dd, devices, list) {
+ if (!blk_queue_stackable(bdev_get_queue(dd->dm_dev.bdev))) {
+ DMWARN("table load rejected: including"
+ " non-request-stackable devices");
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * Request-based dm supports only tables that have a single target now.
+ * To support multiple targets, request splitting support is needed,
+ * and that needs lots of changes in the block-layer.
+ * (e.g. request completion process for partial completion.)
+ */
+ if (t->num_targets > 1) {
+ DMWARN("Request-based dm doesn't support multiple targets yet");
+ return -EINVAL;
+ }
+
+ t->type = DM_TYPE_REQUEST_BASED;
+
+ return 0;
+}
+
+unsigned dm_table_get_type(struct dm_table *t)
+{
+ return t->type;
+}
+
+bool dm_table_bio_based(struct dm_table *t)
+{
+ return dm_table_get_type(t) == DM_TYPE_BIO_BASED;
+}
+
+bool dm_table_request_based(struct dm_table *t)
+{
+ return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED;
+}
+
+int dm_table_alloc_md_mempools(struct dm_table *t)
+{
+ unsigned type = dm_table_get_type(t);
+
+ if (unlikely(type == DM_TYPE_NONE)) {
+ DMWARN("no table type is set, can't allocate mempools");
+ return -EINVAL;
+ }
+
+ t->mempools = dm_alloc_md_mempools(type);
+ if (!t->mempools)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void dm_table_free_md_mempools(struct dm_table *t)
+{
+ dm_free_md_mempools(t->mempools);
+ t->mempools = NULL;
+}
+
+struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t)
+{
+ return t->mempools;
+}
+
static int setup_indexes(struct dm_table *t)
{
int i;
@@ -790,8 +901,6 @@ int dm_table_complete(struct dm_table *t)
int r = 0;
unsigned int leaf_nodes;
- check_for_valid_limits(&t->limits);
-
/* how many indexes will the btree have ? */
leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
@@ -867,6 +976,57 @@ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
}
/*
+ * Establish the new table's queue_limits and validate them.
+ */
+int dm_calculate_queue_limits(struct dm_table *table,
+ struct queue_limits *limits)
+{
+ struct dm_target *uninitialized_var(ti);
+ struct queue_limits ti_limits;
+ unsigned i = 0;
+
+ blk_set_default_limits(limits);
+
+ while (i < dm_table_get_num_targets(table)) {
+ blk_set_default_limits(&ti_limits);
+
+ ti = dm_table_get_target(table, i++);
+
+ if (!ti->type->iterate_devices)
+ goto combine_limits;
+
+ /*
+ * Combine queue limits of all the devices this target uses.
+ */
+ ti->type->iterate_devices(ti, dm_set_device_limits,
+ &ti_limits);
+
+ /*
+ * Check each device area is consistent with the target's
+ * overall queue limits.
+ */
+ if (!ti->type->iterate_devices(ti, device_area_is_valid,
+ &ti_limits))
+ return -EINVAL;
+
+combine_limits:
+ /*
+ * Merge this target's queue limits into the overall limits
+ * for the table.
+ */
+ if (blk_stack_limits(limits, &ti_limits, 0) < 0)
+ DMWARN("%s: target device "
+ "(start sect %llu len %llu) "
+ "is misaligned",
+ dm_device_name(table->md),
+ (unsigned long long) ti->begin,
+ (unsigned long long) ti->len);
+ }
+
+ return validate_hardware_logical_block_alignment(table, limits);
+}
+
+/*
* Set the integrity profile for this device if all devices used have
* matching profiles.
*/
@@ -905,27 +1065,42 @@ no_integrity:
return;
}
-void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
+void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
+ struct queue_limits *limits)
{
/*
- * Make sure we obey the optimistic sub devices
- * restrictions.
+ * Each target device in the table has a data area that should normally
+ * be aligned such that the DM device's alignment_offset is 0.
+ * FIXME: Propagate alignment_offsets up the stack and warn of
+ * sub-optimal or inconsistent settings.
+ */
+ limits->alignment_offset = 0;
+ limits->misaligned = 0;
+
+ /*
+ * Copy table's limits to the DM device's request_queue
*/
- blk_queue_max_sectors(q, t->limits.max_sectors);
- q->max_phys_segments = t->limits.max_phys_segments;
- q->max_hw_segments = t->limits.max_hw_segments;
- q->hardsect_size = t->limits.hardsect_size;
- q->max_segment_size = t->limits.max_segment_size;
- q->max_hw_sectors = t->limits.max_hw_sectors;
- q->seg_boundary_mask = t->limits.seg_boundary_mask;
- q->bounce_pfn = t->limits.bounce_pfn;
-
- if (t->limits.no_cluster)
+ q->limits = *limits;
+
+ if (limits->no_cluster)
queue_flag_clear_unlocked(QUEUE_FLAG_CLUSTER, q);
else
queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, q);
dm_table_set_integrity(t);
+
+ /*
+ * QUEUE_FLAG_STACKABLE must be set after all queue settings are
+ * visible to other CPUs because, once the flag is set, incoming bios
+ * are processed by request-based dm, which refers to the queue
+ * settings.
+ * Until the flag set, bios are passed to bio-based dm and queued to
+ * md->deferred where queue settings are not needed yet.
+ * Those bios are passed to request-based dm at the resume time.
+ */
+ smp_mb();
+ if (dm_table_request_based(t))
+ queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q);
}
unsigned int dm_table_get_num_targets(struct dm_table *t)
@@ -1021,6 +1196,20 @@ int dm_table_any_congested(struct dm_table *t, int bdi_bits)
return r;
}
+int dm_table_any_busy_target(struct dm_table *t)
+{
+ unsigned i;
+ struct dm_target *ti;
+
+ for (i = 0; i < t->num_targets; i++) {
+ ti = t->targets + i;
+ if (ti->type->busy && ti->type->busy(ti))
+ return 1;
+ }
+
+ return 0;
+}
+
void dm_table_unplug_all(struct dm_table *t)
{
struct dm_dev_internal *dd;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 424f7b0..3c6d4ee 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -19,11 +19,18 @@
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/hdreg.h>
-#include <linux/blktrace_api.h>
-#include <trace/block.h>
+
+#include <trace/events/block.h>
#define DM_MSG_PREFIX "core"
+/*
+ * Cookies are numeric values sent with CHANGE and REMOVE
+ * uevents while resuming, removing or renaming the device.
+ */
+#define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
+#define DM_COOKIE_LENGTH 24
+
static const char *_name = DM_NAME;
static unsigned int major = 0;
@@ -53,8 +60,6 @@ struct dm_target_io {
union map_info info;
};
-DEFINE_TRACE(block_bio_complete);
-
/*
* For request-based dm.
* One of these is allocated per request.
@@ -73,7 +78,7 @@ struct dm_rq_target_io {
*/
struct dm_rq_clone_bio_info {
struct bio *orig;
- struct request *rq;
+ struct dm_rq_target_io *tio;
};
union map_info *dm_get_mapinfo(struct bio *bio)
@@ -83,6 +88,14 @@ union map_info *dm_get_mapinfo(struct bio *bio)
return NULL;
}
+union map_info *dm_get_rq_mapinfo(struct request *rq)
+{
+ if (rq && rq->end_io_data)
+ return &((struct dm_rq_target_io *)rq->end_io_data)->info;
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(dm_get_rq_mapinfo);
+
#define MINOR_ALLOCED ((void *)-1)
/*
@@ -159,13 +172,31 @@ struct mapped_device {
* freeze/thaw support require holding onto a super block
*/
struct super_block *frozen_sb;
- struct block_device *suspended_bdev;
+ struct block_device *bdev;
/* forced geometry settings */
struct hd_geometry geometry;
+ /* marker of flush suspend for request-based dm */
+ struct request suspend_rq;
+
+ /* For saving the address of __make_request for request based dm */
+ make_request_fn *saved_make_request_fn;
+
/* sysfs handle */
struct kobject kobj;
+
+ /* zero-length barrier that will be cloned and submitted to targets */
+ struct bio barrier_bio;
+};
+
+/*
+ * For mempools pre-allocation at the table loading time.
+ */
+struct dm_md_mempools {
+ mempool_t *io_pool;
+ mempool_t *tio_pool;
+ struct bio_set *bs;
};
#define MIN_IOS 256
@@ -393,14 +424,29 @@ static void free_io(struct mapped_device *md, struct dm_io *io)
mempool_free(io, md->io_pool);
}
-static struct dm_target_io *alloc_tio(struct mapped_device *md)
+static void free_tio(struct mapped_device *md, struct dm_target_io *tio)
+{
+ mempool_free(tio, md->tio_pool);
+}
+
+static struct dm_rq_target_io *alloc_rq_tio(struct mapped_device *md)
{
- return mempool_alloc(md->tio_pool, GFP_NOIO);
+ return mempool_alloc(md->tio_pool, GFP_ATOMIC);
}
-static void free_tio(struct mapped_device *md, struct dm_target_io *tio)
+static void free_rq_tio(struct dm_rq_target_io *tio)
{
- mempool_free(tio, md->tio_pool);
+ mempool_free(tio, tio->md->tio_pool);
+}
+
+static struct dm_rq_clone_bio_info *alloc_bio_info(struct mapped_device *md)
+{
+ return mempool_alloc(md->io_pool, GFP_ATOMIC);
+}
+
+static void free_bio_info(struct dm_rq_clone_bio_info *info)
+{
+ mempool_free(info, info->tio->md->io_pool);
}
static void start_io_acct(struct dm_io *io)
@@ -466,12 +512,13 @@ static void queue_io(struct mapped_device *md, struct bio *bio)
struct dm_table *dm_get_table(struct mapped_device *md)
{
struct dm_table *t;
+ unsigned long flags;
- read_lock(&md->map_lock);
+ read_lock_irqsave(&md->map_lock, flags);
t = md->map;
if (t)
dm_table_get(t);
- read_unlock(&md->map_lock);
+ read_unlock_irqrestore(&md->map_lock, flags);
return t;
}
@@ -538,9 +585,11 @@ static void dec_pending(struct dm_io *io, int error)
* Target requested pushing back the I/O.
*/
spin_lock_irqsave(&md->deferred_lock, flags);
- if (__noflush_suspending(md))
- bio_list_add_head(&md->deferred, io->bio);
- else
+ if (__noflush_suspending(md)) {
+ if (!bio_barrier(io->bio))
+ bio_list_add_head(&md->deferred,
+ io->bio);
+ } else
/* noflush suspend was interrupted. */
io->error = -EIO;
spin_unlock_irqrestore(&md->deferred_lock, flags);
@@ -555,7 +604,8 @@ static void dec_pending(struct dm_io *io, int error)
* a per-device variable for error reporting.
* Note that you can't touch the bio after end_io_acct
*/
- md->barrier_error = io_error;
+ if (!md->barrier_error && io_error != -EOPNOTSUPP)
+ md->barrier_error = io_error;
end_io_acct(io);
} else {
end_io_acct(io);
@@ -609,6 +659,262 @@ static void clone_endio(struct bio *bio, int error)
dec_pending(io, error);
}
+/*
+ * Partial completion handling for request-based dm
+ */
+static void end_clone_bio(struct bio *clone, int error)
+{
+ struct dm_rq_clone_bio_info *info = clone->bi_private;
+ struct dm_rq_target_io *tio = info->tio;
+ struct bio *bio = info->orig;
+ unsigned int nr_bytes = info->orig->bi_size;
+
+ bio_put(clone);
+
+ if (tio->error)
+ /*
+ * An error has already been detected on the request.
+ * Once error occurred, just let clone->end_io() handle
+ * the remainder.
+ */
+ return;
+ else if (error) {
+ /*
+ * Don't notice the error to the upper layer yet.
+ * The error handling decision is made by the target driver,
+ * when the request is completed.
+ */
+ tio->error = error;
+ return;
+ }
+
+ /*
+ * I/O for the bio successfully completed.
+ * Notice the data completion to the upper layer.
+ */
+
+ /*
+ * bios are processed from the head of the list.
+ * So the completing bio should always be rq->bio.
+ * If it's not, something wrong is happening.
+ */
+ if (tio->orig->bio != bio)
+ DMERR("bio completion is going in the middle of the request");
+
+ /*
+ * Update the original request.
+ * Do not use blk_end_request() here, because it may complete
+ * the original request before the clone, and break the ordering.
+ */
+ blk_update_request(tio->orig, 0, nr_bytes);
+}
+
+/*
+ * Don't touch any member of the md after calling this function because
+ * the md may be freed in dm_put() at the end of this function.
+ * Or do dm_get() before calling this function and dm_put() later.
+ */
+static void rq_completed(struct mapped_device *md, int run_queue)
+{
+ int wakeup_waiters = 0;
+ struct request_queue *q = md->queue;
+ unsigned long flags;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ if (!queue_in_flight(q))
+ wakeup_waiters = 1;
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ /* nudge anyone waiting on suspend queue */
+ if (wakeup_waiters)
+ wake_up(&md->wait);
+
+ if (run_queue)
+ blk_run_queue(q);
+
+ /*
+ * dm_put() must be at the end of this function. See the comment above
+ */
+ dm_put(md);
+}
+
+static void dm_unprep_request(struct request *rq)
+{
+ struct request *clone = rq->special;
+ struct dm_rq_target_io *tio = clone->end_io_data;
+
+ rq->special = NULL;
+ rq->cmd_flags &= ~REQ_DONTPREP;
+
+ blk_rq_unprep_clone(clone);
+ free_rq_tio(tio);
+}
+
+/*
+ * Requeue the original request of a clone.
+ */
+void dm_requeue_unmapped_request(struct request *clone)
+{
+ struct dm_rq_target_io *tio = clone->end_io_data;
+ struct mapped_device *md = tio->md;
+ struct request *rq = tio->orig;
+ struct request_queue *q = rq->q;
+ unsigned long flags;
+
+ dm_unprep_request(rq);
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ if (elv_queue_empty(q))
+ blk_plug_device(q);
+ blk_requeue_request(q, rq);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ rq_completed(md, 0);
+}
+EXPORT_SYMBOL_GPL(dm_requeue_unmapped_request);
+
+static void __stop_queue(struct request_queue *q)
+{
+ blk_stop_queue(q);
+}
+
+static void stop_queue(struct request_queue *q)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ __stop_queue(q);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+}
+
+static void __start_queue(struct request_queue *q)
+{
+ if (blk_queue_stopped(q))
+ blk_start_queue(q);
+}
+
+static void start_queue(struct request_queue *q)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ __start_queue(q);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+}
+
+/*
+ * Complete the clone and the original request.
+ * Must be called without queue lock.
+ */
+static void dm_end_request(struct request *clone, int error)
+{
+ struct dm_rq_target_io *tio = clone->end_io_data;
+ struct mapped_device *md = tio->md;
+ struct request *rq = tio->orig;
+
+ if (blk_pc_request(rq)) {
+ rq->errors = clone->errors;
+ rq->resid_len = clone->resid_len;
+
+ if (rq->sense)
+ /*
+ * We are using the sense buffer of the original
+ * request.
+ * So setting the length of the sense data is enough.
+ */
+ rq->sense_len = clone->sense_len;
+ }
+
+ BUG_ON(clone->bio);
+ free_rq_tio(tio);
+
+ blk_end_request_all(rq, error);
+
+ rq_completed(md, 1);
+}
+
+/*
+ * Request completion handler for request-based dm
+ */
+static void dm_softirq_done(struct request *rq)
+{
+ struct request *clone = rq->completion_data;
+ struct dm_rq_target_io *tio = clone->end_io_data;
+ dm_request_endio_fn rq_end_io = tio->ti->type->rq_end_io;
+ int error = tio->error;
+
+ if (!(rq->cmd_flags & REQ_FAILED) && rq_end_io)
+ error = rq_end_io(tio->ti, clone, error, &tio->info);
+
+ if (error <= 0)
+ /* The target wants to complete the I/O */
+ dm_end_request(clone, error);
+ else if (error == DM_ENDIO_INCOMPLETE)
+ /* The target will handle the I/O */
+ return;
+ else if (error == DM_ENDIO_REQUEUE)
+ /* The target wants to requeue the I/O */
+ dm_requeue_unmapped_request(clone);
+ else {
+ DMWARN("unimplemented target endio return value: %d", error);
+ BUG();
+ }
+}
+
+/*
+ * Complete the clone and the original request with the error status
+ * through softirq context.
+ */
+static void dm_complete_request(struct request *clone, int error)
+{
+ struct dm_rq_target_io *tio = clone->end_io_data;
+ struct request *rq = tio->orig;
+
+ tio->error = error;
+ rq->completion_data = clone;
+ blk_complete_request(rq);
+}
+
+/*
+ * Complete the not-mapped clone and the original request with the error status
+ * through softirq context.
+ * Target's rq_end_io() function isn't called.
+ * This may be used when the target's map_rq() function fails.
+ */
+void dm_kill_unmapped_request(struct request *clone, int error)
+{
+ struct dm_rq_target_io *tio = clone->end_io_data;
+ struct request *rq = tio->orig;
+
+ rq->cmd_flags |= REQ_FAILED;
+ dm_complete_request(clone, error);
+}
+EXPORT_SYMBOL_GPL(dm_kill_unmapped_request);
+
+/*
+ * Called with the queue lock held
+ */
+static void end_clone_request(struct request *clone, int error)
+{
+ /*
+ * For just cleaning up the information of the queue in which
+ * the clone was dispatched.
+ * The clone is *NOT* freed actually here because it is alloced from
+ * dm own mempool and REQ_ALLOCED isn't set in clone->cmd_flags.
+ */
+ __blk_put_request(clone->q, clone);
+
+ /*
+ * Actual request completion is done in a softirq context which doesn't
+ * hold the queue lock. Otherwise, deadlock could occur because:
+ * - another request may be submitted by the upper level driver
+ * of the stacking during the completion
+ * - the submission which requires queue lock may be done
+ * against this queue
+ */
+ dm_complete_request(clone, error);
+}
+
static sector_t max_io_len(struct mapped_device *md,
sector_t sector, struct dm_target *ti)
{
@@ -636,11 +942,6 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
sector_t sector;
struct mapped_device *md;
- /*
- * Sanity checks.
- */
- BUG_ON(!clone->bi_size);
-
clone->bi_end_io = clone_endio;
clone->bi_private = tio;
@@ -656,8 +957,7 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
/* the bio has been remapped so dispatch it */
trace_block_remap(bdev_get_queue(clone->bi_bdev), clone,
- tio->io->bio->bi_bdev->bd_dev,
- clone->bi_sector, sector);
+ tio->io->bio->bi_bdev->bd_dev, sector);
generic_make_request(clone);
} else if (r < 0 || r == DM_MAPIO_REQUEUE) {
@@ -755,6 +1055,48 @@ static struct bio *clone_bio(struct bio *bio, sector_t sector,
return clone;
}
+static struct dm_target_io *alloc_tio(struct clone_info *ci,
+ struct dm_target *ti)
+{
+ struct dm_target_io *tio = mempool_alloc(ci->md->tio_pool, GFP_NOIO);
+
+ tio->io = ci->io;
+ tio->ti = ti;
+ memset(&tio->info, 0, sizeof(tio->info));
+
+ return tio;
+}
+
+static void __flush_target(struct clone_info *ci, struct dm_target *ti,
+ unsigned flush_nr)
+{
+ struct dm_target_io *tio = alloc_tio(ci, ti);
+ struct bio *clone;
+
+ tio->info.flush_request = flush_nr;
+
+ clone = bio_alloc_bioset(GFP_NOIO, 0, ci->md->bs);
+ __bio_clone(clone, ci->bio);
+ clone->bi_destructor = dm_bio_destructor;
+
+ __map_bio(ti, clone, tio);
+}
+
+static int __clone_and_map_empty_barrier(struct clone_info *ci)
+{
+ unsigned target_nr = 0, flush_nr;
+ struct dm_target *ti;
+
+ while ((ti = dm_table_get_target(ci->map, target_nr++)))
+ for (flush_nr = 0; flush_nr < ti->num_flush_requests;
+ flush_nr++)
+ __flush_target(ci, ti, flush_nr);
+
+ ci->sector_count = 0;
+
+ return 0;
+}
+
static int __clone_and_map(struct clone_info *ci)
{
struct bio *clone, *bio = ci->bio;
@@ -762,6 +1104,9 @@ static int __clone_and_map(struct clone_info *ci)
sector_t len = 0, max;
struct dm_target_io *tio;
+ if (unlikely(bio_empty_barrier(bio)))
+ return __clone_and_map_empty_barrier(ci);
+
ti = dm_table_find_target(ci->map, ci->sector);
if (!dm_target_is_valid(ti))
return -EIO;
@@ -771,10 +1116,7 @@ static int __clone_and_map(struct clone_info *ci)
/*
* Allocate a target io object.
*/
- tio = alloc_tio(ci->md);
- tio->io = ci->io;
- tio->ti = ti;
- memset(&tio->info, 0, sizeof(tio->info));
+ tio = alloc_tio(ci, ti);
if (ci->sector_count <= max) {
/*
@@ -830,10 +1172,7 @@ static int __clone_and_map(struct clone_info *ci)
max = max_io_len(ci->md, ci->sector, ti);
- tio = alloc_tio(ci->md);
- tio->io = ci->io;
- tio->ti = ti;
- memset(&tio->info, 0, sizeof(tio->info));
+ tio = alloc_tio(ci, ti);
}
len = min(remaining, max);
@@ -868,7 +1207,8 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
if (!bio_barrier(bio))
bio_io_error(bio);
else
- md->barrier_error = -EIO;
+ if (!md->barrier_error)
+ md->barrier_error = -EIO;
return;
}
@@ -881,6 +1221,8 @@ static void __split_and_process_bio(struct mapped_device *md, struct bio *bio)
ci.io->md = md;
ci.sector = bio->bi_sector;
ci.sector_count = bio_sectors(bio);
+ if (unlikely(bio_empty_barrier(bio)))
+ ci.sector_count = 1;
ci.idx = bio->bi_idx;
start_io_acct(ci.io);
@@ -928,6 +1270,16 @@ static int dm_merge_bvec(struct request_queue *q,
*/
if (max_size && ti->type->merge)
max_size = ti->type->merge(ti, bvm, biovec, max_size);
+ /*
+ * If the target doesn't support merge method and some of the devices
+ * provided their merge_bvec method (we know this by looking at
+ * queue_max_hw_sectors), then we can't allow bios with multiple vector
+ * entries. So always set max_size to 0, and the code below allows
+ * just one page.
+ */
+ else if (queue_max_hw_sectors(q) <= PAGE_SIZE >> 9)
+
+ max_size = 0;
out_table:
dm_table_put(map);
@@ -946,7 +1298,7 @@ out:
* The request function that just remaps the bio built up by
* dm_merge_bvec.
*/
-static int dm_request(struct request_queue *q, struct bio *bio)
+static int _dm_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
@@ -983,12 +1335,274 @@ static int dm_request(struct request_queue *q, struct bio *bio)
return 0;
}
+static int dm_make_request(struct request_queue *q, struct bio *bio)
+{
+ struct mapped_device *md = q->queuedata;
+
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, -EOPNOTSUPP);
+ return 0;
+ }
+
+ return md->saved_make_request_fn(q, bio); /* call __make_request() */
+}
+
+static int dm_request_based(struct mapped_device *md)
+{
+ return blk_queue_stackable(md->queue);
+}
+
+static int dm_request(struct request_queue *q, struct bio *bio)
+{
+ struct mapped_device *md = q->queuedata;
+
+ if (dm_request_based(md))
+ return dm_make_request(q, bio);
+
+ return _dm_request(q, bio);
+}
+
+void dm_dispatch_request(struct request *rq)
+{
+ int r;
+
+ if (blk_queue_io_stat(rq->q))
+ rq->cmd_flags |= REQ_IO_STAT;
+
+ rq->start_time = jiffies;
+ r = blk_insert_cloned_request(rq->q, rq);
+ if (r)
+ dm_complete_request(rq, r);
+}
+EXPORT_SYMBOL_GPL(dm_dispatch_request);
+
+static void dm_rq_bio_destructor(struct bio *bio)
+{
+ struct dm_rq_clone_bio_info *info = bio->bi_private;
+ struct mapped_device *md = info->tio->md;
+
+ free_bio_info(info);
+ bio_free(bio, md->bs);
+}
+
+static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
+ void *data)
+{
+ struct dm_rq_target_io *tio = data;
+ struct mapped_device *md = tio->md;
+ struct dm_rq_clone_bio_info *info = alloc_bio_info(md);
+
+ if (!info)
+ return -ENOMEM;
+
+ info->orig = bio_orig;
+ info->tio = tio;
+ bio->bi_end_io = end_clone_bio;
+ bio->bi_private = info;
+ bio->bi_destructor = dm_rq_bio_destructor;
+
+ return 0;
+}
+
+static int setup_clone(struct request *clone, struct request *rq,
+ struct dm_rq_target_io *tio)
+{
+ int r = blk_rq_prep_clone(clone, rq, tio->md->bs, GFP_ATOMIC,
+ dm_rq_bio_constructor, tio);
+
+ if (r)
+ return r;
+
+ clone->cmd = rq->cmd;
+ clone->cmd_len = rq->cmd_len;
+ clone->sense = rq->sense;
+ clone->buffer = rq->buffer;
+ clone->end_io = end_clone_request;
+ clone->end_io_data = tio;
+
+ return 0;
+}
+
+static int dm_rq_flush_suspending(struct mapped_device *md)
+{
+ return !md->suspend_rq.special;
+}
+
+/*
+ * Called with the queue lock held.
+ */
+static int dm_prep_fn(struct request_queue *q, struct request *rq)
+{
+ struct mapped_device *md = q->queuedata;
+ struct dm_rq_target_io *tio;
+ struct request *clone;
+
+ if (unlikely(rq == &md->suspend_rq)) {
+ if (dm_rq_flush_suspending(md))
+ return BLKPREP_OK;
+ else
+ /* The flush suspend was interrupted */
+ return BLKPREP_KILL;
+ }
+
+ if (unlikely(rq->special)) {
+ DMWARN("Already has something in rq->special.");
+ return BLKPREP_KILL;
+ }
+
+ tio = alloc_rq_tio(md); /* Only one for each original request */
+ if (!tio)
+ /* -ENOMEM */
+ return BLKPREP_DEFER;
+
+ tio->md = md;
+ tio->ti = NULL;
+ tio->orig = rq;
+ tio->error = 0;
+ memset(&tio->info, 0, sizeof(tio->info));
+
+ clone = &tio->clone;
+ if (setup_clone(clone, rq, tio)) {
+ /* -ENOMEM */
+ free_rq_tio(tio);
+ return BLKPREP_DEFER;
+ }
+
+ rq->special = clone;
+ rq->cmd_flags |= REQ_DONTPREP;
+
+ return BLKPREP_OK;
+}
+
+static void map_request(struct dm_target *ti, struct request *rq,
+ struct mapped_device *md)
+{
+ int r;
+ struct request *clone = rq->special;
+ struct dm_rq_target_io *tio = clone->end_io_data;
+
+ /*
+ * Hold the md reference here for the in-flight I/O.
+ * We can't rely on the reference count by device opener,
+ * because the device may be closed during the request completion
+ * when all bios are completed.
+ * See the comment in rq_completed() too.
+ */
+ dm_get(md);
+
+ tio->ti = ti;
+ r = ti->type->map_rq(ti, clone, &tio->info);
+ switch (r) {
+ case DM_MAPIO_SUBMITTED:
+ /* The target has taken the I/O to submit by itself later */
+ break;
+ case DM_MAPIO_REMAPPED:
+ /* The target has remapped the I/O so dispatch it */
+ dm_dispatch_request(clone);
+ break;
+ case DM_MAPIO_REQUEUE:
+ /* The target wants to requeue the I/O */
+ dm_requeue_unmapped_request(clone);
+ break;
+ default:
+ if (r > 0) {
+ DMWARN("unimplemented target map return value: %d", r);
+ BUG();
+ }
+
+ /* The target wants to complete the I/O */
+ dm_kill_unmapped_request(clone, r);
+ break;
+ }
+}
+
+/*
+ * q->request_fn for request-based dm.
+ * Called with the queue lock held.
+ */
+static void dm_request_fn(struct request_queue *q)
+{
+ struct mapped_device *md = q->queuedata;
+ struct dm_table *map = dm_get_table(md);
+ struct dm_target *ti;
+ struct request *rq;
+
+ /*
+ * For noflush suspend, check blk_queue_stopped() to immediately
+ * quit I/O dispatching.
+ */
+ while (!blk_queue_plugged(q) && !blk_queue_stopped(q)) {
+ rq = blk_peek_request(q);
+ if (!rq)
+ goto plug_and_out;
+
+ if (unlikely(rq == &md->suspend_rq)) { /* Flush suspend maker */
+ if (queue_in_flight(q))
+ /* Not quiet yet. Wait more */
+ goto plug_and_out;
+
+ /* This device should be quiet now */
+ __stop_queue(q);
+ blk_start_request(rq);
+ __blk_end_request_all(rq, 0);
+ wake_up(&md->wait);
+ goto out;
+ }
+
+ ti = dm_table_find_target(map, blk_rq_pos(rq));
+ if (ti->type->busy && ti->type->busy(ti))
+ goto plug_and_out;
+
+ blk_start_request(rq);
+ spin_unlock(q->queue_lock);
+ map_request(ti, rq, md);
+ spin_lock_irq(q->queue_lock);
+ }
+
+ goto out;
+
+plug_and_out:
+ if (!elv_queue_empty(q))
+ /* Some requests still remain, retry later */
+ blk_plug_device(q);
+
+out:
+ dm_table_put(map);
+
+ return;
+}
+
+int dm_underlying_device_busy(struct request_queue *q)
+{
+ return blk_lld_busy(q);
+}
+EXPORT_SYMBOL_GPL(dm_underlying_device_busy);
+
+static int dm_lld_busy(struct request_queue *q)
+{
+ int r;
+ struct mapped_device *md = q->queuedata;
+ struct dm_table *map = dm_get_table(md);
+
+ if (!map || test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))
+ r = 1;
+ else
+ r = dm_table_any_busy_target(map);
+
+ dm_table_put(map);
+
+ return r;
+}
+
static void dm_unplug_all(struct request_queue *q)
{
struct mapped_device *md = q->queuedata;
struct dm_table *map = dm_get_table(md);
if (map) {
+ if (dm_request_based(md))
+ generic_unplug_device(q);
+
dm_table_unplug_all(map);
dm_table_put(map);
}
@@ -1003,7 +1617,16 @@ static int dm_any_congested(void *congested_data, int bdi_bits)
if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
map = dm_get_table(md);
if (map) {
- r = dm_table_any_congested(map, bdi_bits);
+ /*
+ * Request-based dm cares about only own queue for
+ * the query about congestion status of request_queue
+ */
+ if (dm_request_based(md))
+ r = md->queue->backing_dev_info.state &
+ bdi_bits;
+ else
+ r = dm_table_any_congested(map, bdi_bits);
+
dm_table_put(map);
}
}
@@ -1126,30 +1749,32 @@ static struct mapped_device *alloc_dev(int minor)
INIT_LIST_HEAD(&md->uevent_list);
spin_lock_init(&md->uevent_lock);
- md->queue = blk_alloc_queue(GFP_KERNEL);
+ md->queue = blk_init_queue(dm_request_fn, NULL);
if (!md->queue)
goto bad_queue;
+ /*
+ * Request-based dm devices cannot be stacked on top of bio-based dm
+ * devices. The type of this dm device has not been decided yet,
+ * although we initialized the queue using blk_init_queue().
+ * The type is decided at the first table loading time.
+ * To prevent problematic device stacking, clear the queue flag
+ * for request stacking support until then.
+ *
+ * This queue is new, so no concurrency on the queue_flags.
+ */
+ queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue);
+ md->saved_make_request_fn = md->queue->make_request_fn;
md->queue->queuedata = md;
md->queue->backing_dev_info.congested_fn = dm_any_congested;
md->queue->backing_dev_info.congested_data = md;
blk_queue_make_request(md->queue, dm_request);
- blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN, NULL);
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
md->queue->unplug_fn = dm_unplug_all;
blk_queue_merge_bvec(md->queue, dm_merge_bvec);
-
- md->io_pool = mempool_create_slab_pool(MIN_IOS, _io_cache);
- if (!md->io_pool)
- goto bad_io_pool;
-
- md->tio_pool = mempool_create_slab_pool(MIN_IOS, _tio_cache);
- if (!md->tio_pool)
- goto bad_tio_pool;
-
- md->bs = bioset_create(16, 0);
- if (!md->bs)
- goto bad_no_bioset;
+ blk_queue_softirq_done(md->queue, dm_softirq_done);
+ blk_queue_prep_rq(md->queue, dm_prep_fn);
+ blk_queue_lld_busy(md->queue, dm_lld_busy);
md->disk = alloc_disk(1);
if (!md->disk)
@@ -1173,6 +1798,10 @@ static struct mapped_device *alloc_dev(int minor)
if (!md->wq)
goto bad_thread;
+ md->bdev = bdget_disk(md->disk, 0);
+ if (!md->bdev)
+ goto bad_bdev;
+
/* Populate the mapping, nobody knows we exist yet */
spin_lock(&_minor_lock);
old_md = idr_replace(&_minor_idr, md, minor);
@@ -1182,15 +1811,11 @@ static struct mapped_device *alloc_dev(int minor)
return md;
+bad_bdev:
+ destroy_workqueue(md->wq);
bad_thread:
put_disk(md->disk);
bad_disk:
- bioset_free(md->bs);
-bad_no_bioset:
- mempool_destroy(md->tio_pool);
-bad_tio_pool:
- mempool_destroy(md->io_pool);
-bad_io_pool:
blk_cleanup_queue(md->queue);
bad_queue:
free_minor(minor);
@@ -1207,14 +1832,15 @@ static void free_dev(struct mapped_device *md)
{
int minor = MINOR(disk_devt(md->disk));
- if (md->suspended_bdev) {
- unlock_fs(md);
- bdput(md->suspended_bdev);
- }
+ unlock_fs(md);
+ bdput(md->bdev);
destroy_workqueue(md->wq);
- mempool_destroy(md->tio_pool);
- mempool_destroy(md->io_pool);
- bioset_free(md->bs);
+ if (md->tio_pool)
+ mempool_destroy(md->tio_pool);
+ if (md->io_pool)
+ mempool_destroy(md->io_pool);
+ if (md->bs)
+ bioset_free(md->bs);
blk_integrity_unregister(md->disk);
del_gendisk(md->disk);
free_minor(minor);
@@ -1229,6 +1855,29 @@ static void free_dev(struct mapped_device *md)
kfree(md);
}
+static void __bind_mempools(struct mapped_device *md, struct dm_table *t)
+{
+ struct dm_md_mempools *p;
+
+ if (md->io_pool && md->tio_pool && md->bs)
+ /* the md already has necessary mempools */
+ goto out;
+
+ p = dm_table_get_md_mempools(t);
+ BUG_ON(!p || md->io_pool || md->tio_pool || md->bs);
+
+ md->io_pool = p->io_pool;
+ p->io_pool = NULL;
+ md->tio_pool = p->tio_pool;
+ p->tio_pool = NULL;
+ md->bs = p->bs;
+ p->bs = NULL;
+
+out:
+ /* mempool bind completed, now no need any mempools in the table */
+ dm_table_free_md_mempools(t);
+}
+
/*
* Bind a table to the device.
*/
@@ -1252,15 +1901,17 @@ static void __set_size(struct mapped_device *md, sector_t size)
{
set_capacity(md->disk, size);
- mutex_lock(&md->suspended_bdev->bd_inode->i_mutex);
- i_size_write(md->suspended_bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
- mutex_unlock(&md->suspended_bdev->bd_inode->i_mutex);
+ mutex_lock(&md->bdev->bd_inode->i_mutex);
+ i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
+ mutex_unlock(&md->bdev->bd_inode->i_mutex);
}
-static int __bind(struct mapped_device *md, struct dm_table *t)
+static int __bind(struct mapped_device *md, struct dm_table *t,
+ struct queue_limits *limits)
{
struct request_queue *q = md->queue;
sector_t size;
+ unsigned long flags;
size = dm_table_get_size(t);
@@ -1270,8 +1921,7 @@ static int __bind(struct mapped_device *md, struct dm_table *t)
if (size != get_capacity(md->disk))
memset(&md->geometry, 0, sizeof(md->geometry));
- if (md->suspended_bdev)
- __set_size(md, size);
+ __set_size(md, size);
if (!size) {
dm_table_destroy(t);
@@ -1280,10 +1930,22 @@ static int __bind(struct mapped_device *md, struct dm_table *t)
dm_table_event_callback(t, event_callback, md);
- write_lock(&md->map_lock);
+ /*
+ * The queue hasn't been stopped yet, if the old table type wasn't
+ * for request-based during suspension. So stop it to prevent
+ * I/O mapping before resume.
+ * This must be done before setting the queue restrictions,
+ * because request-based dm may be run just after the setting.
+ */
+ if (dm_table_request_based(t) && !blk_queue_stopped(q))
+ stop_queue(q);
+
+ __bind_mempools(md, t);
+
+ write_lock_irqsave(&md->map_lock, flags);
md->map = t;
- dm_table_set_restrictions(t, q);
- write_unlock(&md->map_lock);
+ dm_table_set_restrictions(t, q, limits);
+ write_unlock_irqrestore(&md->map_lock, flags);
return 0;
}
@@ -1291,14 +1953,15 @@ static int __bind(struct mapped_device *md, struct dm_table *t)
static void __unbind(struct mapped_device *md)
{
struct dm_table *map = md->map;
+ unsigned long flags;
if (!map)
return;
dm_table_event_callback(map, NULL, NULL);
- write_lock(&md->map_lock);
+ write_lock_irqsave(&md->map_lock, flags);
md->map = NULL;
- write_unlock(&md->map_lock);
+ write_unlock_irqrestore(&md->map_lock, flags);
dm_table_destroy(map);
}
@@ -1402,6 +2065,8 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
{
int r = 0;
DECLARE_WAITQUEUE(wait, current);
+ struct request_queue *q = md->queue;
+ unsigned long flags;
dm_unplug_all(md->queue);
@@ -1411,7 +2076,14 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
set_current_state(interruptible);
smp_mb();
- if (!atomic_read(&md->pending))
+ if (dm_request_based(md)) {
+ spin_lock_irqsave(q->queue_lock, flags);
+ if (!queue_in_flight(q) && blk_queue_stopped(q)) {
+ spin_unlock_irqrestore(q->queue_lock, flags);
+ break;
+ }
+ spin_unlock_irqrestore(q->queue_lock, flags);
+ } else if (!atomic_read(&md->pending))
break;
if (interruptible == TASK_INTERRUPTIBLE &&
@@ -1429,34 +2101,36 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
return r;
}
-static int dm_flush(struct mapped_device *md)
+static void dm_flush(struct mapped_device *md)
{
dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
- return 0;
+
+ bio_init(&md->barrier_bio);
+ md->barrier_bio.bi_bdev = md->bdev;
+ md->barrier_bio.bi_rw = WRITE_BARRIER;
+ __split_and_process_bio(md, &md->barrier_bio);
+
+ dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
}
static void process_barrier(struct mapped_device *md, struct bio *bio)
{
- int error = dm_flush(md);
+ md->barrier_error = 0;
- if (unlikely(error)) {
- bio_endio(bio, error);
- return;
- }
- if (bio_empty_barrier(bio)) {
- bio_endio(bio, 0);
- return;
- }
-
- __split_and_process_bio(md, bio);
+ dm_flush(md);
- error = dm_flush(md);
-
- if (!error && md->barrier_error)
- error = md->barrier_error;
+ if (!bio_empty_barrier(bio)) {
+ __split_and_process_bio(md, bio);
+ dm_flush(md);
+ }
if (md->barrier_error != DM_ENDIO_REQUEUE)
- bio_endio(bio, error);
+ bio_endio(bio, md->barrier_error);
+ else {
+ spin_lock_irq(&md->deferred_lock);
+ bio_list_add_head(&md->deferred, bio);
+ spin_unlock_irq(&md->deferred_lock);
+ }
}
/*
@@ -1482,10 +2156,14 @@ static void dm_wq_work(struct work_struct *work)
up_write(&md->io_lock);
- if (bio_barrier(c))
- process_barrier(md, c);
- else
- __split_and_process_bio(md, c);
+ if (dm_request_based(md))
+ generic_make_request(c);
+ else {
+ if (bio_barrier(c))
+ process_barrier(md, c);
+ else
+ __split_and_process_bio(md, c);
+ }
down_write(&md->io_lock);
}
@@ -1505,6 +2183,7 @@ static void dm_queue_flush(struct mapped_device *md)
*/
int dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
+ struct queue_limits limits;
int r = -EINVAL;
mutex_lock(&md->suspend_lock);
@@ -1513,19 +2192,96 @@ int dm_swap_table(struct mapped_device *md, struct dm_table *table)
if (!dm_suspended(md))
goto out;
- /* without bdev, the device size cannot be changed */
- if (!md->suspended_bdev)
- if (get_capacity(md->disk) != dm_table_get_size(table))
- goto out;
+ r = dm_calculate_queue_limits(table, &limits);
+ if (r)
+ goto out;
+
+ /* cannot change the device type, once a table is bound */
+ if (md->map &&
+ (dm_table_get_type(md->map) != dm_table_get_type(table))) {
+ DMWARN("can't change the device type after a table is bound");
+ goto out;
+ }
+
+ /*
+ * It is enought that blk_queue_ordered() is called only once when
+ * the first bio-based table is bound.
+ *
+ * This setting should be moved to alloc_dev() when request-based dm
+ * supports barrier.
+ */
+ if (!md->map && dm_table_bio_based(table))
+ blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN, NULL);
__unbind(md);
- r = __bind(md, table);
+ r = __bind(md, table, &limits);
out:
mutex_unlock(&md->suspend_lock);
return r;
}
+static void dm_rq_invalidate_suspend_marker(struct mapped_device *md)
+{
+ md->suspend_rq.special = (void *)0x1;
+}
+
+static void dm_rq_abort_suspend(struct mapped_device *md, int noflush)
+{
+ struct request_queue *q = md->queue;
+ unsigned long flags;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ if (!noflush)
+ dm_rq_invalidate_suspend_marker(md);
+ __start_queue(q);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+}
+
+static void dm_rq_start_suspend(struct mapped_device *md, int noflush)
+{
+ struct request *rq = &md->suspend_rq;
+ struct request_queue *q = md->queue;
+
+ if (noflush)
+ stop_queue(q);
+ else {
+ blk_rq_init(q, rq);
+ blk_insert_request(q, rq, 0, NULL);
+ }
+}
+
+static int dm_rq_suspend_available(struct mapped_device *md, int noflush)
+{
+ int r = 1;
+ struct request *rq = &md->suspend_rq;
+ struct request_queue *q = md->queue;
+ unsigned long flags;
+
+ if (noflush)
+ return r;
+
+ /* The marker must be protected by queue lock if it is in use */
+ spin_lock_irqsave(q->queue_lock, flags);
+ if (unlikely(rq->ref_count)) {
+ /*
+ * This can happen, when the previous flush suspend was
+ * interrupted, the marker is still in the queue and
+ * this flush suspend has been invoked, because we don't
+ * remove the marker at the time of suspend interruption.
+ * We have only one marker per mapped_device, so we can't
+ * start another flush suspend while it is in use.
+ */
+ BUG_ON(!rq->special); /* The marker should be invalidated */
+ DMWARN("Invalidating the previous flush suspend is still in"
+ " progress. Please retry later.");
+ r = 0;
+ }
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ return r;
+}
+
/*
* Functions to lock and unlock any filesystem running on the
* device.
@@ -1536,7 +2292,7 @@ static int lock_fs(struct mapped_device *md)
WARN_ON(md->frozen_sb);
- md->frozen_sb = freeze_bdev(md->suspended_bdev);
+ md->frozen_sb = freeze_bdev(md->bdev);
if (IS_ERR(md->frozen_sb)) {
r = PTR_ERR(md->frozen_sb);
md->frozen_sb = NULL;
@@ -1545,9 +2301,6 @@ static int lock_fs(struct mapped_device *md)
set_bit(DMF_FROZEN, &md->flags);
- /* don't bdput right now, we don't want the bdev
- * to go away while it is locked.
- */
return 0;
}
@@ -1556,7 +2309,7 @@ static void unlock_fs(struct mapped_device *md)
if (!test_bit(DMF_FROZEN, &md->flags))
return;
- thaw_bdev(md->suspended_bdev, md->frozen_sb);
+ thaw_bdev(md->bdev, md->frozen_sb);
md->frozen_sb = NULL;
clear_bit(DMF_FROZEN, &md->flags);
}
@@ -1568,6 +2321,53 @@ static void unlock_fs(struct mapped_device *md)
* dm_bind_table, dm_suspend must be called to flush any in
* flight bios and ensure that any further io gets deferred.
*/
+/*
+ * Suspend mechanism in request-based dm.
+ *
+ * After the suspend starts, further incoming requests are kept in
+ * the request_queue and deferred.
+ * Remaining requests in the request_queue at the start of suspend are flushed
+ * if it is flush suspend.
+ * The suspend completes when the following conditions have been satisfied,
+ * so wait for it:
+ * 1. q->in_flight is 0 (which means no in_flight request)
+ * 2. queue has been stopped (which means no request dispatching)
+ *
+ *
+ * Noflush suspend
+ * ---------------
+ * Noflush suspend doesn't need to dispatch remaining requests.
+ * So stop the queue immediately. Then, wait for all in_flight requests
+ * to be completed or requeued.
+ *
+ * To abort noflush suspend, start the queue.
+ *
+ *
+ * Flush suspend
+ * -------------
+ * Flush suspend needs to dispatch remaining requests. So stop the queue
+ * after the remaining requests are completed. (Requeued request must be also
+ * re-dispatched and completed. Until then, we can't stop the queue.)
+ *
+ * During flushing the remaining requests, further incoming requests are also
+ * inserted to the same queue. To distinguish which requests are to be
+ * flushed, we insert a marker request to the queue at the time of starting
+ * flush suspend, like a barrier.
+ * The dispatching is blocked when the marker is found on the top of the queue.
+ * And the queue is stopped when all in_flight requests are completed, since
+ * that means the remaining requests are completely flushed.
+ * Then, the marker is removed from the queue.
+ *
+ * To abort flush suspend, we also need to take care of the marker, not only
+ * starting the queue.
+ * We don't remove the marker forcibly from the queue since it's against
+ * the block-layer manner. Instead, we put a invalidated mark on the marker.
+ * When the invalidated marker is found on the top of the queue, it is
+ * immediately removed from the queue, so it doesn't block dispatching.
+ * Because we have only one marker per mapped_device, we can't start another
+ * flush suspend until the invalidated marker is removed from the queue.
+ * So fail and return with -EBUSY in such a case.
+ */
int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
{
struct dm_table *map = NULL;
@@ -1582,6 +2382,11 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
goto out_unlock;
}
+ if (dm_request_based(md) && !dm_rq_suspend_available(md, noflush)) {
+ r = -EBUSY;
+ goto out_unlock;
+ }
+
map = dm_get_table(md);
/*
@@ -1594,24 +2399,14 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
/* This does not get reverted if there's an error later. */
dm_table_presuspend_targets(map);
- /* bdget() can stall if the pending I/Os are not flushed */
- if (!noflush) {
- md->suspended_bdev = bdget_disk(md->disk, 0);
- if (!md->suspended_bdev) {
- DMWARN("bdget failed in dm_suspend");
- r = -ENOMEM;
+ /*
+ * Flush I/O to the device. noflush supersedes do_lockfs,
+ * because lock_fs() needs to flush I/Os.
+ */
+ if (!noflush && do_lockfs) {
+ r = lock_fs(md);
+ if (r)
goto out;
- }
-
- /*
- * Flush I/O to the device. noflush supersedes do_lockfs,
- * because lock_fs() needs to flush I/Os.
- */
- if (do_lockfs) {
- r = lock_fs(md);
- if (r)
- goto out;
- }
}
/*
@@ -1637,6 +2432,9 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
flush_workqueue(md->wq);
+ if (dm_request_based(md))
+ dm_rq_start_suspend(md, noflush);
+
/*
* At this point no more requests are entering target request routines.
* We call dm_wait_for_completion to wait for all existing requests
@@ -1653,6 +2451,9 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
if (r < 0) {
dm_queue_flush(md);
+ if (dm_request_based(md))
+ dm_rq_abort_suspend(md, noflush);
+
unlock_fs(md);
goto out; /* pushback list is already flushed, so skip flush */
}
@@ -1668,11 +2469,6 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
set_bit(DMF_SUSPENDED, &md->flags);
out:
- if (r && md->suspended_bdev) {
- bdput(md->suspended_bdev);
- md->suspended_bdev = NULL;
- }
-
dm_table_put(map);
out_unlock:
@@ -1699,21 +2495,20 @@ int dm_resume(struct mapped_device *md)
dm_queue_flush(md);
- unlock_fs(md);
+ /*
+ * Flushing deferred I/Os must be done after targets are resumed
+ * so that mapping of targets can work correctly.
+ * Request-based dm is queueing the deferred I/Os in its request_queue.
+ */
+ if (dm_request_based(md))
+ start_queue(md->queue);
- if (md->suspended_bdev) {
- bdput(md->suspended_bdev);
- md->suspended_bdev = NULL;
- }
+ unlock_fs(md);
clear_bit(DMF_SUSPENDED, &md->flags);
dm_table_unplug_all(map);
-
- dm_kobject_uevent(md);
-
r = 0;
-
out:
dm_table_put(map);
mutex_unlock(&md->suspend_lock);
@@ -1724,9 +2519,19 @@ out:
/*-----------------------------------------------------------------
* Event notification.
*---------------------------------------------------------------*/
-void dm_kobject_uevent(struct mapped_device *md)
-{
- kobject_uevent(&disk_to_dev(md->disk)->kobj, KOBJ_CHANGE);
+void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
+ unsigned cookie)
+{
+ char udev_cookie[DM_COOKIE_LENGTH];
+ char *envp[] = { udev_cookie, NULL };
+
+ if (!cookie)
+ kobject_uevent(&disk_to_dev(md->disk)->kobj, action);
+ else {
+ snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u",
+ DM_COOKIE_ENV_VAR_NAME, cookie);
+ kobject_uevent_env(&disk_to_dev(md->disk)->kobj, action, envp);
+ }
}
uint32_t dm_next_uevent_seq(struct mapped_device *md)
@@ -1780,6 +2585,10 @@ struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
if (&md->kobj != kobj)
return NULL;
+ if (test_bit(DMF_FREEING, &md->flags) ||
+ test_bit(DMF_DELETING, &md->flags))
+ return NULL;
+
dm_get(md);
return md;
}
@@ -1800,6 +2609,61 @@ int dm_noflush_suspending(struct dm_target *ti)
}
EXPORT_SYMBOL_GPL(dm_noflush_suspending);
+struct dm_md_mempools *dm_alloc_md_mempools(unsigned type)
+{
+ struct dm_md_mempools *pools = kmalloc(sizeof(*pools), GFP_KERNEL);
+
+ if (!pools)
+ return NULL;
+
+ pools->io_pool = (type == DM_TYPE_BIO_BASED) ?
+ mempool_create_slab_pool(MIN_IOS, _io_cache) :
+ mempool_create_slab_pool(MIN_IOS, _rq_bio_info_cache);
+ if (!pools->io_pool)
+ goto free_pools_and_out;
+
+ pools->tio_pool = (type == DM_TYPE_BIO_BASED) ?
+ mempool_create_slab_pool(MIN_IOS, _tio_cache) :
+ mempool_create_slab_pool(MIN_IOS, _rq_tio_cache);
+ if (!pools->tio_pool)
+ goto free_io_pool_and_out;
+
+ pools->bs = (type == DM_TYPE_BIO_BASED) ?
+ bioset_create(16, 0) : bioset_create(MIN_IOS, 0);
+ if (!pools->bs)
+ goto free_tio_pool_and_out;
+
+ return pools;
+
+free_tio_pool_and_out:
+ mempool_destroy(pools->tio_pool);
+
+free_io_pool_and_out:
+ mempool_destroy(pools->io_pool);
+
+free_pools_and_out:
+ kfree(pools);
+
+ return NULL;
+}
+
+void dm_free_md_mempools(struct dm_md_mempools *pools)
+{
+ if (!pools)
+ return;
+
+ if (pools->io_pool)
+ mempool_destroy(pools->io_pool);
+
+ if (pools->tio_pool)
+ mempool_destroy(pools->tio_pool);
+
+ if (pools->bs)
+ bioset_free(pools->bs);
+
+ kfree(pools);
+}
+
static struct block_device_operations dm_blk_dops = {
.open = dm_blk_open,
.release = dm_blk_close,
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index a31506d..23278ae 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -23,6 +23,13 @@
#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
/*
+ * Type of table and mapped_device's mempool
+ */
+#define DM_TYPE_NONE 0
+#define DM_TYPE_BIO_BASED 1
+#define DM_TYPE_REQUEST_BASED 2
+
+/*
* List of devices that a metadevice uses and should open/close.
*/
struct dm_dev_internal {
@@ -32,6 +39,7 @@ struct dm_dev_internal {
};
struct dm_table;
+struct dm_md_mempools;
/*-----------------------------------------------------------------
* Internal table functions.
@@ -41,18 +49,34 @@ void dm_table_event_callback(struct dm_table *t,
void (*fn)(void *), void *context);
struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
-void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
+int dm_calculate_queue_limits(struct dm_table *table,
+ struct queue_limits *limits);
+void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
+ struct queue_limits *limits);
struct list_head *dm_table_get_devices(struct dm_table *t);
void dm_table_presuspend_targets(struct dm_table *t);
void dm_table_postsuspend_targets(struct dm_table *t);
int dm_table_resume_targets(struct dm_table *t);
int dm_table_any_congested(struct dm_table *t, int bdi_bits);
+int dm_table_any_busy_target(struct dm_table *t);
+int dm_table_set_type(struct dm_table *t);
+unsigned dm_table_get_type(struct dm_table *t);
+bool dm_table_bio_based(struct dm_table *t);
+bool dm_table_request_based(struct dm_table *t);
+int dm_table_alloc_md_mempools(struct dm_table *t);
+void dm_table_free_md_mempools(struct dm_table *t);
+struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
/*
* To check the return value from dm_table_find_target().
*/
#define dm_target_is_valid(t) ((t)->table)
+/*
+ * To check whether the target type is request-based or not (bio-based).
+ */
+#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
+
/*-----------------------------------------------------------------
* A registry of target types.
*---------------------------------------------------------------*/
@@ -92,9 +116,16 @@ void dm_stripe_exit(void);
int dm_open_count(struct mapped_device *md);
int dm_lock_for_deletion(struct mapped_device *md);
-void dm_kobject_uevent(struct mapped_device *md);
+void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
+ unsigned cookie);
int dm_kcopyd_init(void);
void dm_kcopyd_exit(void);
+/*
+ * Mempool operations
+ */
+struct dm_md_mempools *dm_alloc_md_mempools(unsigned type);
+void dm_free_md_mempools(struct dm_md_mempools *pools);
+
#endif
diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index 8695809..87d88db 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -255,14 +255,14 @@ static void status(struct seq_file *seq, mddev_t *mddev)
}
-static int reconfig(mddev_t *mddev, int layout, int chunk_size)
+static int reshape(mddev_t *mddev)
{
- int mode = layout & ModeMask;
- int count = layout >> ModeShift;
+ int mode = mddev->new_layout & ModeMask;
+ int count = mddev->new_layout >> ModeShift;
conf_t *conf = mddev->private;
- if (chunk_size != -1)
- return -EINVAL;
+ if (mddev->new_layout < 0)
+ return 0;
/* new layout */
if (mode == ClearFaults)
@@ -279,6 +279,7 @@ static int reconfig(mddev_t *mddev, int layout, int chunk_size)
atomic_set(&conf->counters[mode], count);
} else
return -EINVAL;
+ mddev->new_layout = -1;
mddev->layout = -1; /* makes sure further changes come through */
return 0;
}
@@ -298,8 +299,12 @@ static int run(mddev_t *mddev)
{
mdk_rdev_t *rdev;
int i;
+ conf_t *conf;
+
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
- conf_t *conf = kmalloc(sizeof(*conf), GFP_KERNEL);
+ conf = kmalloc(sizeof(*conf), GFP_KERNEL);
if (!conf)
return -ENOMEM;
@@ -315,7 +320,7 @@ static int run(mddev_t *mddev)
md_set_array_sectors(mddev, faulty_size(mddev, 0, 0));
mddev->private = conf;
- reconfig(mddev, mddev->layout, -1);
+ reshape(mddev);
return 0;
}
@@ -338,7 +343,7 @@ static struct mdk_personality faulty_personality =
.run = run,
.stop = stop,
.status = status,
- .reconfig = reconfig,
+ .check_reshape = reshape,
.size = faulty_size,
};
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 7a36e38..15c8b7b 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -27,19 +27,27 @@
*/
static inline dev_info_t *which_dev(mddev_t *mddev, sector_t sector)
{
- dev_info_t *hash;
- linear_conf_t *conf = mddev_to_conf(mddev);
- sector_t idx = sector >> conf->sector_shift;
+ int lo, mid, hi;
+ linear_conf_t *conf;
+
+ lo = 0;
+ hi = mddev->raid_disks - 1;
+ conf = rcu_dereference(mddev->private);
/*
- * sector_div(a,b) returns the remainer and sets a to a/b
+ * Binary Search
*/
- (void)sector_div(idx, conf->spacing);
- hash = conf->hash_table[idx];
- while (sector >= hash->num_sectors + hash->start_sector)
- hash++;
- return hash;
+ while (hi > lo) {
+
+ mid = (hi + lo) / 2;
+ if (sector < conf->disks[mid].end_sector)
+ hi = mid;
+ else
+ lo = mid + 1;
+ }
+
+ return conf->disks + lo;
}
/**
@@ -59,8 +67,10 @@ static int linear_mergeable_bvec(struct request_queue *q,
unsigned long maxsectors, bio_sectors = bvm->bi_size >> 9;
sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
+ rcu_read_lock();
dev0 = which_dev(mddev, sector);
- maxsectors = dev0->num_sectors - (sector - dev0->start_sector);
+ maxsectors = dev0->end_sector - sector;
+ rcu_read_unlock();
if (maxsectors < bio_sectors)
maxsectors = 0;
@@ -79,46 +89,57 @@ static int linear_mergeable_bvec(struct request_queue *q,
static void linear_unplug(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
- linear_conf_t *conf = mddev_to_conf(mddev);
+ linear_conf_t *conf;
int i;
+ rcu_read_lock();
+ conf = rcu_dereference(mddev->private);
+
for (i=0; i < mddev->raid_disks; i++) {
struct request_queue *r_queue = bdev_get_queue(conf->disks[i].rdev->bdev);
blk_unplug(r_queue);
}
+ rcu_read_unlock();
}
static int linear_congested(void *data, int bits)
{
mddev_t *mddev = data;
- linear_conf_t *conf = mddev_to_conf(mddev);
+ linear_conf_t *conf;
int i, ret = 0;
+ rcu_read_lock();
+ conf = rcu_dereference(mddev->private);
+
for (i = 0; i < mddev->raid_disks && !ret ; i++) {
struct request_queue *q = bdev_get_queue(conf->disks[i].rdev->bdev);
ret |= bdi_congested(&q->backing_dev_info, bits);
}
+
+ rcu_read_unlock();
return ret;
}
static sector_t linear_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
- linear_conf_t *conf = mddev_to_conf(mddev);
+ linear_conf_t *conf;
+ sector_t array_sectors;
+ rcu_read_lock();
+ conf = rcu_dereference(mddev->private);
WARN_ONCE(sectors || raid_disks,
"%s does not support generic reshape\n", __func__);
+ array_sectors = conf->array_sectors;
+ rcu_read_unlock();
- return conf->array_sectors;
+ return array_sectors;
}
static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
{
linear_conf_t *conf;
- dev_info_t **table;
mdk_rdev_t *rdev;
- int i, nb_zone, cnt;
- sector_t min_sectors;
- sector_t curr_sector;
+ int i, cnt;
conf = kzalloc (sizeof (*conf) + raid_disks*sizeof(dev_info_t),
GFP_KERNEL);
@@ -131,6 +152,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
list_for_each_entry(rdev, &mddev->disks, same_set) {
int j = rdev->raid_disk;
dev_info_t *disk = conf->disks + j;
+ sector_t sectors;
if (j < 0 || j >= raid_disks || disk->rdev) {
printk("linear: disk numbering problem. Aborting!\n");
@@ -138,6 +160,11 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
}
disk->rdev = rdev;
+ if (mddev->chunk_sectors) {
+ sectors = rdev->sectors;
+ sector_div(sectors, mddev->chunk_sectors);
+ rdev->sectors = sectors * mddev->chunk_sectors;
+ }
blk_queue_stack_limits(mddev->queue,
rdev->bdev->bd_disk->queue);
@@ -146,105 +173,27 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
* a one page request is never in violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
- disk->num_sectors = rdev->sectors;
conf->array_sectors += rdev->sectors;
-
cnt++;
+
}
if (cnt != raid_disks) {
printk("linear: not enough drives present. Aborting!\n");
goto out;
}
- min_sectors = conf->array_sectors;
- sector_div(min_sectors, PAGE_SIZE/sizeof(struct dev_info *));
- if (min_sectors == 0)
- min_sectors = 1;
-
- /* min_sectors is the minimum spacing that will fit the hash
- * table in one PAGE. This may be much smaller than needed.
- * We find the smallest non-terminal set of consecutive devices
- * that is larger than min_sectors and use the size of that as
- * the actual spacing
- */
- conf->spacing = conf->array_sectors;
- for (i=0; i < cnt-1 ; i++) {
- sector_t tmp = 0;
- int j;
- for (j = i; j < cnt - 1 && tmp < min_sectors; j++)
- tmp += conf->disks[j].num_sectors;
- if (tmp >= min_sectors && tmp < conf->spacing)
- conf->spacing = tmp;
- }
-
- /* spacing may be too large for sector_div to work with,
- * so we might need to pre-shift
- */
- conf->sector_shift = 0;
- if (sizeof(sector_t) > sizeof(u32)) {
- sector_t space = conf->spacing;
- while (space > (sector_t)(~(u32)0)) {
- space >>= 1;
- conf->sector_shift++;
- }
- }
/*
- * This code was restructured to work around a gcc-2.95.3 internal
- * compiler error. Alter it with care.
+ * Here we calculate the device offsets.
*/
- {
- sector_t sz;
- unsigned round;
- unsigned long base;
-
- sz = conf->array_sectors >> conf->sector_shift;
- sz += 1; /* force round-up */
- base = conf->spacing >> conf->sector_shift;
- round = sector_div(sz, base);
- nb_zone = sz + (round ? 1 : 0);
- }
- BUG_ON(nb_zone > PAGE_SIZE / sizeof(struct dev_info *));
-
- conf->hash_table = kmalloc (sizeof (struct dev_info *) * nb_zone,
- GFP_KERNEL);
- if (!conf->hash_table)
- goto out;
+ conf->disks[0].end_sector = conf->disks[0].rdev->sectors;
- /*
- * Here we generate the linear hash table
- * First calculate the device offsets.
- */
- conf->disks[0].start_sector = 0;
for (i = 1; i < raid_disks; i++)
- conf->disks[i].start_sector =
- conf->disks[i-1].start_sector +
- conf->disks[i-1].num_sectors;
-
- table = conf->hash_table;
- i = 0;
- for (curr_sector = 0;
- curr_sector < conf->array_sectors;
- curr_sector += conf->spacing) {
-
- while (i < raid_disks-1 &&
- curr_sector >= conf->disks[i+1].start_sector)
- i++;
-
- *table ++ = conf->disks + i;
- }
-
- if (conf->sector_shift) {
- conf->spacing >>= conf->sector_shift;
- /* round spacing up so that when we divide by it,
- * we err on the side of "too-low", which is safest.
- */
- conf->spacing++;
- }
-
- BUG_ON(table - conf->hash_table > nb_zone);
+ conf->disks[i].end_sector =
+ conf->disks[i-1].end_sector +
+ conf->disks[i].rdev->sectors;
return conf;
@@ -257,6 +206,8 @@ static int linear_run (mddev_t *mddev)
{
linear_conf_t *conf;
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
conf = linear_conf(mddev, mddev->raid_disks);
@@ -272,6 +223,12 @@ static int linear_run (mddev_t *mddev)
return 0;
}
+static void free_conf(struct rcu_head *head)
+{
+ linear_conf_t *conf = container_of(head, linear_conf_t, rcu);
+ kfree(conf);
+}
+
static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
{
/* Adding a drive to a linear array allows the array to grow.
@@ -282,7 +239,7 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
* The current one is never freed until the array is stopped.
* This avoids races.
*/
- linear_conf_t *newconf;
+ linear_conf_t *newconf, *oldconf;
if (rdev->saved_raid_disk != mddev->raid_disks)
return -EINVAL;
@@ -294,25 +251,29 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
if (!newconf)
return -ENOMEM;
- newconf->prev = mddev_to_conf(mddev);
- mddev->private = newconf;
+ oldconf = rcu_dereference(mddev->private);
mddev->raid_disks++;
+ rcu_assign_pointer(mddev->private, newconf);
md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
set_capacity(mddev->gendisk, mddev->array_sectors);
+ call_rcu(&oldconf->rcu, free_conf);
return 0;
}
static int linear_stop (mddev_t *mddev)
{
- linear_conf_t *conf = mddev_to_conf(mddev);
-
+ linear_conf_t *conf = mddev->private;
+
+ /*
+ * We do not require rcu protection here since
+ * we hold reconfig_mutex for both linear_add and
+ * linear_stop, so they cannot race.
+ * We should make sure any old 'conf's are properly
+ * freed though.
+ */
+ rcu_barrier();
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
- do {
- linear_conf_t *t = conf->prev;
- kfree(conf->hash_table);
- kfree(conf);
- conf = t;
- } while (conf);
+ kfree(conf);
return 0;
}
@@ -322,6 +283,7 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
const int rw = bio_data_dir(bio);
mddev_t *mddev = q->queuedata;
dev_info_t *tmp_dev;
+ sector_t start_sector;
int cpu;
if (unlikely(bio_barrier(bio))) {
@@ -335,33 +297,36 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
bio_sectors(bio));
part_stat_unlock();
+ rcu_read_lock();
tmp_dev = which_dev(mddev, bio->bi_sector);
-
- if (unlikely(bio->bi_sector >= (tmp_dev->num_sectors +
- tmp_dev->start_sector)
- || (bio->bi_sector <
- tmp_dev->start_sector))) {
+ start_sector = tmp_dev->end_sector - tmp_dev->rdev->sectors;
+
+
+ if (unlikely(bio->bi_sector >= (tmp_dev->end_sector)
+ || (bio->bi_sector < start_sector))) {
char b[BDEVNAME_SIZE];
printk("linear_make_request: Sector %llu out of bounds on "
"dev %s: %llu sectors, offset %llu\n",
(unsigned long long)bio->bi_sector,
bdevname(tmp_dev->rdev->bdev, b),
- (unsigned long long)tmp_dev->num_sectors,
- (unsigned long long)tmp_dev->start_sector);
+ (unsigned long long)tmp_dev->rdev->sectors,
+ (unsigned long long)start_sector);
+ rcu_read_unlock();
bio_io_error(bio);
return 0;
}
if (unlikely(bio->bi_sector + (bio->bi_size >> 9) >
- tmp_dev->start_sector + tmp_dev->num_sectors)) {
+ tmp_dev->end_sector)) {
/* This bio crosses a device boundary, so we have to
* split it.
*/
struct bio_pair *bp;
+ sector_t end_sector = tmp_dev->end_sector;
+
+ rcu_read_unlock();
- bp = bio_split(bio,
- tmp_dev->start_sector + tmp_dev->num_sectors
- - bio->bi_sector);
+ bp = bio_split(bio, end_sector - bio->bi_sector);
if (linear_make_request(q, &bp->bio1))
generic_make_request(&bp->bio1);
@@ -372,8 +337,9 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
}
bio->bi_bdev = tmp_dev->rdev->bdev;
- bio->bi_sector = bio->bi_sector - tmp_dev->start_sector
+ bio->bi_sector = bio->bi_sector - start_sector
+ tmp_dev->rdev->data_offset;
+ rcu_read_unlock();
return 1;
}
@@ -381,7 +347,7 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
static void linear_status (struct seq_file *seq, mddev_t *mddev)
{
- seq_printf(seq, " %dk rounding", mddev->chunk_size/1024);
+ seq_printf(seq, " %dk rounding", mddev->chunk_sectors / 2);
}
diff --git a/drivers/md/linear.h b/drivers/md/linear.h
index bf81795..0ce29b6 100644
--- a/drivers/md/linear.h
+++ b/drivers/md/linear.h
@@ -3,27 +3,19 @@
struct dev_info {
mdk_rdev_t *rdev;
- sector_t num_sectors;
- sector_t start_sector;
+ sector_t end_sector;
};
typedef struct dev_info dev_info_t;
struct linear_private_data
{
- struct linear_private_data *prev; /* earlier version */
- dev_info_t **hash_table;
- sector_t spacing;
sector_t array_sectors;
- int sector_shift; /* shift before dividing
- * by spacing
- */
dev_info_t disks[0];
+ struct rcu_head rcu;
};
typedef struct linear_private_data linear_conf_t;
-#define mddev_to_conf(mddev) ((linear_conf_t *) mddev->private)
-
#endif
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 641b211..09be637 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -440,15 +440,6 @@ static inline sector_t calc_dev_sboffset(struct block_device *bdev)
return MD_NEW_SIZE_SECTORS(num_sectors);
}
-static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
-{
- sector_t num_sectors = rdev->sb_start;
-
- if (chunk_size)
- num_sectors &= ~((sector_t)chunk_size/512 - 1);
- return num_sectors;
-}
-
static int alloc_disk_sb(mdk_rdev_t * rdev)
{
if (rdev->sb_page)
@@ -745,6 +736,24 @@ struct super_type {
};
/*
+ * Check that the given mddev has no bitmap.
+ *
+ * This function is called from the run method of all personalities that do not
+ * support bitmaps. It prints an error message and returns non-zero if mddev
+ * has a bitmap. Otherwise, it returns 0.
+ *
+ */
+int md_check_no_bitmap(mddev_t *mddev)
+{
+ if (!mddev->bitmap_file && !mddev->bitmap_offset)
+ return 0;
+ printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
+ mdname(mddev), mddev->pers->name);
+ return 1;
+}
+EXPORT_SYMBOL(md_check_no_bitmap);
+
+/*
* load_super for 0.90.0
*/
static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
@@ -797,17 +806,6 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
rdev->data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
- if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
- if (sb->level != 1 && sb->level != 4
- && sb->level != 5 && sb->level != 6
- && sb->level != 10) {
- /* FIXME use a better test */
- printk(KERN_WARNING
- "md: bitmaps not supported for this level.\n");
- goto abort;
- }
- }
-
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
else
@@ -836,7 +834,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
else
ret = 0;
}
- rdev->sectors = calc_num_sectors(rdev, sb->chunk_size);
+ rdev->sectors = rdev->sb_start;
if (rdev->sectors < sb->size * 2 && sb->level > 1)
/* "this cannot possibly happen" ... */
@@ -866,7 +864,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->minor_version = sb->minor_version;
mddev->patch_version = sb->patch_version;
mddev->external = 0;
- mddev->chunk_size = sb->chunk_size;
+ mddev->chunk_sectors = sb->chunk_size >> 9;
mddev->ctime = sb->ctime;
mddev->utime = sb->utime;
mddev->level = sb->level;
@@ -883,13 +881,13 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->delta_disks = sb->delta_disks;
mddev->new_level = sb->new_level;
mddev->new_layout = sb->new_layout;
- mddev->new_chunk = sb->new_chunk;
+ mddev->new_chunk_sectors = sb->new_chunk >> 9;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
- mddev->new_chunk = mddev->chunk_size;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (sb->state & (1<<MD_SB_CLEAN))
@@ -1004,7 +1002,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->new_level = mddev->new_level;
sb->delta_disks = mddev->delta_disks;
sb->new_layout = mddev->new_layout;
- sb->new_chunk = mddev->new_chunk;
+ sb->new_chunk = mddev->new_chunk_sectors << 9;
}
mddev->minor_version = sb->minor_version;
if (mddev->in_sync)
@@ -1018,7 +1016,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->recovery_cp = 0;
sb->layout = mddev->layout;
- sb->chunk_size = mddev->chunk_size;
+ sb->chunk_size = mddev->chunk_sectors << 9;
if (mddev->bitmap && mddev->bitmap_file == NULL)
sb->state |= (1<<MD_SB_BITMAP_PRESENT);
@@ -1185,24 +1183,13 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
bdevname(rdev->bdev,b));
return -EINVAL;
}
- if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
- if (sb->level != cpu_to_le32(1) &&
- sb->level != cpu_to_le32(4) &&
- sb->level != cpu_to_le32(5) &&
- sb->level != cpu_to_le32(6) &&
- sb->level != cpu_to_le32(10)) {
- printk(KERN_WARNING
- "md: bitmaps not supported for this level.\n");
- return -EINVAL;
- }
- }
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
- bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
+ bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
if (rdev->sb_size & bmask)
rdev->sb_size = (rdev->sb_size | bmask) + 1;
@@ -1248,9 +1235,6 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
if (rdev->sectors < le64_to_cpu(sb->data_size))
return -EINVAL;
rdev->sectors = le64_to_cpu(sb->data_size);
- if (le32_to_cpu(sb->chunksize))
- rdev->sectors &= ~((sector_t)le32_to_cpu(sb->chunksize) - 1);
-
if (le64_to_cpu(sb->size) > rdev->sectors)
return -EINVAL;
return ret;
@@ -1271,7 +1255,7 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->major_version = 1;
mddev->patch_version = 0;
mddev->external = 0;
- mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
+ mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
mddev->level = le32_to_cpu(sb->level);
@@ -1297,13 +1281,13 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->delta_disks = le32_to_cpu(sb->delta_disks);
mddev->new_level = le32_to_cpu(sb->new_level);
mddev->new_layout = le32_to_cpu(sb->new_layout);
- mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
+ mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
- mddev->new_chunk = mddev->chunk_size;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
}
} else if (mddev->pers == NULL) {
@@ -1375,7 +1359,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->raid_disks = cpu_to_le32(mddev->raid_disks);
sb->size = cpu_to_le64(mddev->dev_sectors);
- sb->chunksize = cpu_to_le32(mddev->chunk_size >> 9);
+ sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
sb->level = cpu_to_le32(mddev->level);
sb->layout = cpu_to_le32(mddev->layout);
@@ -1402,7 +1386,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->new_layout = cpu_to_le32(mddev->new_layout);
sb->delta_disks = cpu_to_le32(mddev->delta_disks);
sb->new_level = cpu_to_le32(mddev->new_level);
- sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
+ sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
}
max_dev = 0;
@@ -1897,6 +1881,7 @@ static void md_update_sb(mddev_t * mddev, int force_change)
int sync_req;
int nospares = 0;
+ mddev->utime = get_seconds();
if (mddev->external)
return;
repeat:
@@ -1926,7 +1911,6 @@ repeat:
nospares = 0;
sync_req = mddev->in_sync;
- mddev->utime = get_seconds();
/* If this is just a dirty<->clean transition, and the array is clean
* and 'events' is odd, we can roll back to the previous clean state */
@@ -2597,15 +2581,6 @@ static void analyze_sbs(mddev_t * mddev)
clear_bit(In_sync, &rdev->flags);
}
}
-
-
-
- if (mddev->recovery_cp != MaxSector &&
- mddev->level >= 1)
- printk(KERN_ERR "md: %s: raid array is not clean"
- " -- starting background reconstruction\n",
- mdname(mddev));
-
}
static void md_safemode_timeout(unsigned long data);
@@ -2746,7 +2721,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
if (IS_ERR(priv)) {
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
- mddev->new_chunk = mddev->chunk_size;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks -= mddev->delta_disks;
mddev->delta_disks = 0;
module_put(pers->owner);
@@ -2764,7 +2739,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
mddev->level = mddev->new_level;
mddev->layout = mddev->new_layout;
- mddev->chunk_size = mddev->new_chunk;
+ mddev->chunk_sectors = mddev->new_chunk_sectors;
mddev->delta_disks = 0;
pers->run(mddev);
mddev_resume(mddev);
@@ -2800,11 +2775,14 @@ layout_store(mddev_t *mddev, const char *buf, size_t len)
if (mddev->pers) {
int err;
- if (mddev->pers->reconfig == NULL)
+ if (mddev->pers->check_reshape == NULL)
return -EBUSY;
- err = mddev->pers->reconfig(mddev, n, -1);
- if (err)
+ mddev->new_layout = n;
+ err = mddev->pers->check_reshape(mddev);
+ if (err) {
+ mddev->new_layout = mddev->layout;
return err;
+ }
} else {
mddev->new_layout = n;
if (mddev->reshape_position == MaxSector)
@@ -2857,10 +2835,11 @@ static ssize_t
chunk_size_show(mddev_t *mddev, char *page)
{
if (mddev->reshape_position != MaxSector &&
- mddev->chunk_size != mddev->new_chunk)
- return sprintf(page, "%d (%d)\n", mddev->new_chunk,
- mddev->chunk_size);
- return sprintf(page, "%d\n", mddev->chunk_size);
+ mddev->chunk_sectors != mddev->new_chunk_sectors)
+ return sprintf(page, "%d (%d)\n",
+ mddev->new_chunk_sectors << 9,
+ mddev->chunk_sectors << 9);
+ return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
}
static ssize_t
@@ -2874,15 +2853,18 @@ chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
if (mddev->pers) {
int err;
- if (mddev->pers->reconfig == NULL)
+ if (mddev->pers->check_reshape == NULL)
return -EBUSY;
- err = mddev->pers->reconfig(mddev, -1, n);
- if (err)
+ mddev->new_chunk_sectors = n >> 9;
+ err = mddev->pers->check_reshape(mddev);
+ if (err) {
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
return err;
+ }
} else {
- mddev->new_chunk = n;
+ mddev->new_chunk_sectors = n >> 9;
if (mddev->reshape_position == MaxSector)
- mddev->chunk_size = n;
+ mddev->chunk_sectors = n >> 9;
}
return len;
}
@@ -3527,8 +3509,9 @@ min_sync_store(mddev_t *mddev, const char *buf, size_t len)
return -EBUSY;
/* Must be a multiple of chunk_size */
- if (mddev->chunk_size) {
- if (min & (sector_t)((mddev->chunk_size>>9)-1))
+ if (mddev->chunk_sectors) {
+ sector_t temp = min;
+ if (sector_div(temp, mddev->chunk_sectors))
return -EINVAL;
}
mddev->resync_min = min;
@@ -3564,8 +3547,9 @@ max_sync_store(mddev_t *mddev, const char *buf, size_t len)
return -EBUSY;
/* Must be a multiple of chunk_size */
- if (mddev->chunk_size) {
- if (max & (sector_t)((mddev->chunk_size>>9)-1))
+ if (mddev->chunk_sectors) {
+ sector_t temp = max;
+ if (sector_div(temp, mddev->chunk_sectors))
return -EINVAL;
}
mddev->resync_max = max;
@@ -3656,7 +3640,7 @@ reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
- mddev->new_chunk = mddev->chunk_size;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
return len;
}
@@ -3976,11 +3960,9 @@ static int start_dirty_degraded;
static int do_md_run(mddev_t * mddev)
{
int err;
- int chunk_size;
mdk_rdev_t *rdev;
struct gendisk *disk;
struct mdk_personality *pers;
- char b[BDEVNAME_SIZE];
if (list_empty(&mddev->disks))
/* cannot run an array with no devices.. */
@@ -3998,38 +3980,6 @@ static int do_md_run(mddev_t * mddev)
analyze_sbs(mddev);
}
- chunk_size = mddev->chunk_size;
-
- if (chunk_size) {
- if (chunk_size > MAX_CHUNK_SIZE) {
- printk(KERN_ERR "too big chunk_size: %d > %d\n",
- chunk_size, MAX_CHUNK_SIZE);
- return -EINVAL;
- }
- /*
- * chunk-size has to be a power of 2
- */
- if ( (1 << ffz(~chunk_size)) != chunk_size) {
- printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
- return -EINVAL;
- }
-
- /* devices must have minimum size of one chunk */
- list_for_each_entry(rdev, &mddev->disks, same_set) {
- if (test_bit(Faulty, &rdev->flags))
- continue;
- if (rdev->sectors < chunk_size / 512) {
- printk(KERN_WARNING
- "md: Dev %s smaller than chunk_size:"
- " %llu < %d\n",
- bdevname(rdev->bdev,b),
- (unsigned long long)rdev->sectors,
- chunk_size / 512);
- return -EINVAL;
- }
- }
- }
-
if (mddev->level != LEVEL_NONE)
request_module("md-level-%d", mddev->level);
else if (mddev->clevel[0])
@@ -4405,7 +4355,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
mddev->flags = 0;
mddev->ro = 0;
mddev->metadata_type[0] = 0;
- mddev->chunk_size = 0;
+ mddev->chunk_sectors = 0;
mddev->ctime = mddev->utime = 0;
mddev->layout = 0;
mddev->max_disks = 0;
@@ -4413,7 +4363,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
mddev->delta_disks = 0;
mddev->new_level = LEVEL_NONE;
mddev->new_layout = 0;
- mddev->new_chunk = 0;
+ mddev->new_chunk_sectors = 0;
mddev->curr_resync = 0;
mddev->resync_mismatches = 0;
mddev->suspend_lo = mddev->suspend_hi = 0;
@@ -4618,7 +4568,7 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
info.spare_disks = spare;
info.layout = mddev->layout;
- info.chunk_size = mddev->chunk_size;
+ info.chunk_size = mddev->chunk_sectors << 9;
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
@@ -4843,7 +4793,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
} else
rdev->sb_start = calc_dev_sboffset(rdev->bdev);
- rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size);
+ rdev->sectors = rdev->sb_start;
err = bind_rdev_to_array(rdev, mddev);
if (err) {
@@ -4913,7 +4863,7 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
else
rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
- rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size);
+ rdev->sectors = rdev->sb_start;
if (test_bit(Faulty, &rdev->flags)) {
printk(KERN_WARNING
@@ -5062,7 +5012,7 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
mddev->external = 0;
mddev->layout = info->layout;
- mddev->chunk_size = info->chunk_size;
+ mddev->chunk_sectors = info->chunk_size >> 9;
mddev->max_disks = MD_SB_DISKS;
@@ -5081,7 +5031,7 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
get_random_bytes(mddev->uuid, 16);
mddev->new_level = mddev->level;
- mddev->new_chunk = mddev->chunk_size;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->new_layout = mddev->layout;
mddev->delta_disks = 0;
@@ -5191,7 +5141,7 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
mddev->level != info->level ||
/* mddev->layout != info->layout || */
!mddev->persistent != info->not_persistent||
- mddev->chunk_size != info->chunk_size ||
+ mddev->chunk_sectors != info->chunk_size >> 9 ||
/* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
((state^info->state) & 0xfffffe00)
)
@@ -5215,10 +5165,15 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
* we don't need to do anything at the md level, the
* personality will take care of it all.
*/
- if (mddev->pers->reconfig == NULL)
+ if (mddev->pers->check_reshape == NULL)
return -EINVAL;
- else
- return mddev->pers->reconfig(mddev, info->layout, -1);
+ else {
+ mddev->new_layout = info->layout;
+ rv = mddev->pers->check_reshape(mddev);
+ if (rv)
+ mddev->new_layout = mddev->layout;
+ return rv;
+ }
}
if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
rv = update_size(mddev, (sector_t)info->size * 2);
@@ -6717,7 +6672,8 @@ void md_check_recovery(mddev_t *mddev)
*/
if (mddev->reshape_position != MaxSector) {
- if (mddev->pers->check_reshape(mddev) != 0)
+ if (mddev->pers->check_reshape == NULL ||
+ mddev->pers->check_reshape(mddev) != 0)
/* Cannot proceed */
goto unlock;
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 8227ab9..9430a11 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -30,13 +30,6 @@ typedef struct mddev_s mddev_t;
typedef struct mdk_rdev_s mdk_rdev_t;
/*
- * options passed in raidrun:
- */
-
-/* Currently this must fit in an 'int' */
-#define MAX_CHUNK_SIZE (1<<30)
-
-/*
* MD's 'extended' device
*/
struct mdk_rdev_s
@@ -145,7 +138,7 @@ struct mddev_s
int external; /* metadata is
* managed externally */
char metadata_type[17]; /* externally set*/
- int chunk_size;
+ int chunk_sectors;
time_t ctime, utime;
int level, layout;
char clevel[16];
@@ -166,7 +159,8 @@ struct mddev_s
* If reshape_position is MaxSector, then no reshape is happening (yet).
*/
sector_t reshape_position;
- int delta_disks, new_level, new_layout, new_chunk;
+ int delta_disks, new_level, new_layout;
+ int new_chunk_sectors;
struct mdk_thread_s *thread; /* management thread */
struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */
@@ -325,7 +319,6 @@ struct mdk_personality
int (*check_reshape) (mddev_t *mddev);
int (*start_reshape) (mddev_t *mddev);
void (*finish_reshape) (mddev_t *mddev);
- int (*reconfig) (mddev_t *mddev, int layout, int chunk_size);
/* quiesce moves between quiescence states
* 0 - fully active
* 1 - no new requests allowed
@@ -437,5 +430,6 @@ extern void md_new_event(mddev_t *mddev);
extern int md_allow_write(mddev_t *mddev);
extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);
+extern int md_check_no_bitmap(mddev_t *mddev);
#endif /* _MD_MD_H */
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 41ced0c..cbe368f 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -58,7 +58,7 @@ static void multipath_reschedule_retry (struct multipath_bh *mp_bh)
{
unsigned long flags;
mddev_t *mddev = mp_bh->mddev;
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
spin_lock_irqsave(&conf->device_lock, flags);
list_add(&mp_bh->retry_list, &conf->retry_list);
@@ -75,7 +75,7 @@ static void multipath_reschedule_retry (struct multipath_bh *mp_bh)
static void multipath_end_bh_io (struct multipath_bh *mp_bh, int err)
{
struct bio *bio = mp_bh->master_bio;
- multipath_conf_t *conf = mddev_to_conf(mp_bh->mddev);
+ multipath_conf_t *conf = mp_bh->mddev->private;
bio_endio(bio, err);
mempool_free(mp_bh, conf->pool);
@@ -85,7 +85,7 @@ static void multipath_end_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct multipath_bh * mp_bh = (struct multipath_bh *)(bio->bi_private);
- multipath_conf_t *conf = mddev_to_conf(mp_bh->mddev);
+ multipath_conf_t *conf = mp_bh->mddev->private;
mdk_rdev_t *rdev = conf->multipaths[mp_bh->path].rdev;
if (uptodate)
@@ -107,7 +107,7 @@ static void multipath_end_request(struct bio *bio, int error)
static void unplug_slaves(mddev_t *mddev)
{
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
int i;
rcu_read_lock();
@@ -138,7 +138,7 @@ static void multipath_unplug(struct request_queue *q)
static int multipath_make_request (struct request_queue *q, struct bio * bio)
{
mddev_t *mddev = q->queuedata;
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
struct multipath_bh * mp_bh;
struct multipath_info *multipath;
const int rw = bio_data_dir(bio);
@@ -180,7 +180,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
static void multipath_status (struct seq_file *seq, mddev_t *mddev)
{
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
int i;
seq_printf (seq, " [%d/%d] [", conf->raid_disks,
@@ -195,7 +195,7 @@ static void multipath_status (struct seq_file *seq, mddev_t *mddev)
static int multipath_congested(void *data, int bits)
{
mddev_t *mddev = data;
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
int i, ret = 0;
rcu_read_lock();
@@ -220,7 +220,7 @@ static int multipath_congested(void *data, int bits)
*/
static void multipath_error (mddev_t *mddev, mdk_rdev_t *rdev)
{
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
if (conf->working_disks <= 1) {
/*
@@ -303,7 +303,7 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
* merge_bvec_fn will be involved in multipath.)
*/
if (q->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
+ queue_max_sectors(q) > (PAGE_SIZE>>9))
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
conf->working_disks++;
@@ -367,7 +367,7 @@ static void multipathd (mddev_t *mddev)
struct multipath_bh *mp_bh;
struct bio *bio;
unsigned long flags;
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
md_check_recovery(mddev);
@@ -421,6 +421,9 @@ static int multipath_run (mddev_t *mddev)
struct multipath_info *disk;
mdk_rdev_t *rdev;
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
+
if (mddev->level != LEVEL_MULTIPATH) {
printk("multipath: %s: raid level not set to multipath IO (%d)\n",
mdname(mddev), mddev->level);
@@ -467,7 +470,7 @@ static int multipath_run (mddev_t *mddev)
* violating it, not that we ever expect a device with
* a merge_bvec_fn to be involved in multipath */
if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
if (!test_bit(Faulty, &rdev->flags))
@@ -531,7 +534,7 @@ out:
static int multipath_stop (mddev_t *mddev)
{
- multipath_conf_t *conf = mddev_to_conf(mddev);
+ multipath_conf_t *conf = mddev->private;
md_unregister_thread(mddev->thread);
mddev->thread = NULL;
diff --git a/drivers/md/multipath.h b/drivers/md/multipath.h
index 6fa70b4..d1c2a8d 100644
--- a/drivers/md/multipath.h
+++ b/drivers/md/multipath.h
@@ -19,12 +19,6 @@ struct multipath_private_data {
typedef struct multipath_private_data multipath_conf_t;
/*
- * this is the only point in the RAID code where we violate
- * C type safety. mddev->private is an 'opaque' pointer.
- */
-#define mddev_to_conf(mddev) ((multipath_conf_t *) mddev->private)
-
-/*
* this is our 'private' 'collective' MULTIPATH buffer head.
* it contains information about what kind of IO operations were started
* for this MULTIPATH operation, and about their status:
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index c08d755..ab4a489 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -26,8 +26,8 @@
static void raid0_unplug(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
- raid0_conf_t *conf = mddev_to_conf(mddev);
- mdk_rdev_t **devlist = conf->strip_zone[0].dev;
+ raid0_conf_t *conf = mddev->private;
+ mdk_rdev_t **devlist = conf->devlist;
int i;
for (i=0; i<mddev->raid_disks; i++) {
@@ -40,8 +40,8 @@ static void raid0_unplug(struct request_queue *q)
static int raid0_congested(void *data, int bits)
{
mddev_t *mddev = data;
- raid0_conf_t *conf = mddev_to_conf(mddev);
- mdk_rdev_t **devlist = conf->strip_zone[0].dev;
+ raid0_conf_t *conf = mddev->private;
+ mdk_rdev_t **devlist = conf->devlist;
int i, ret = 0;
for (i = 0; i < mddev->raid_disks && !ret ; i++) {
@@ -52,27 +52,60 @@ static int raid0_congested(void *data, int bits)
return ret;
}
+/*
+ * inform the user of the raid configuration
+*/
+static void dump_zones(mddev_t *mddev)
+{
+ int j, k, h;
+ sector_t zone_size = 0;
+ sector_t zone_start = 0;
+ char b[BDEVNAME_SIZE];
+ raid0_conf_t *conf = mddev->private;
+ printk(KERN_INFO "******* %s configuration *********\n",
+ mdname(mddev));
+ h = 0;
+ for (j = 0; j < conf->nr_strip_zones; j++) {
+ printk(KERN_INFO "zone%d=[", j);
+ for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
+ printk("%s/",
+ bdevname(conf->devlist[j*mddev->raid_disks
+ + k]->bdev, b));
+ printk("]\n");
+
+ zone_size = conf->strip_zone[j].zone_end - zone_start;
+ printk(KERN_INFO " zone offset=%llukb "
+ "device offset=%llukb size=%llukb\n",
+ (unsigned long long)zone_start>>1,
+ (unsigned long long)conf->strip_zone[j].dev_start>>1,
+ (unsigned long long)zone_size>>1);
+ zone_start = conf->strip_zone[j].zone_end;
+ }
+ printk(KERN_INFO "**********************************\n\n");
+}
-static int create_strip_zones (mddev_t *mddev)
+static int create_strip_zones(mddev_t *mddev)
{
- int i, c, j;
- sector_t current_start, curr_zone_start;
- sector_t min_spacing;
- raid0_conf_t *conf = mddev_to_conf(mddev);
- mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev;
+ int i, c, j, err;
+ sector_t curr_zone_end, sectors;
+ mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev, **dev;
struct strip_zone *zone;
int cnt;
char b[BDEVNAME_SIZE];
-
- /*
- * The number of 'same size groups'
- */
- conf->nr_strip_zones = 0;
-
+ raid0_conf_t *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
+
+ if (!conf)
+ return -ENOMEM;
list_for_each_entry(rdev1, &mddev->disks, same_set) {
printk(KERN_INFO "raid0: looking at %s\n",
bdevname(rdev1->bdev,b));
c = 0;
+
+ /* round size to chunk_size */
+ sectors = rdev1->sectors;
+ sector_div(sectors, mddev->chunk_sectors);
+ rdev1->sectors = sectors * mddev->chunk_sectors;
+
list_for_each_entry(rdev2, &mddev->disks, same_set) {
printk(KERN_INFO "raid0: comparing %s(%llu)",
bdevname(rdev1->bdev,b),
@@ -103,16 +136,16 @@ static int create_strip_zones (mddev_t *mddev)
}
}
printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones);
-
+ err = -ENOMEM;
conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
conf->nr_strip_zones, GFP_KERNEL);
if (!conf->strip_zone)
- return 1;
+ goto abort;
conf->devlist = kzalloc(sizeof(mdk_rdev_t*)*
conf->nr_strip_zones*mddev->raid_disks,
GFP_KERNEL);
if (!conf->devlist)
- return 1;
+ goto abort;
/* The first zone must contain all devices, so here we check that
* there is a proper alignment of slots to devices and find them all
@@ -120,7 +153,8 @@ static int create_strip_zones (mddev_t *mddev)
zone = &conf->strip_zone[0];
cnt = 0;
smallest = NULL;
- zone->dev = conf->devlist;
+ dev = conf->devlist;
+ err = -EINVAL;
list_for_each_entry(rdev1, &mddev->disks, same_set) {
int j = rdev1->raid_disk;
@@ -129,12 +163,12 @@ static int create_strip_zones (mddev_t *mddev)
"aborting!\n", j);
goto abort;
}
- if (zone->dev[j]) {
+ if (dev[j]) {
printk(KERN_ERR "raid0: multiple devices for %d - "
"aborting!\n", j);
goto abort;
}
- zone->dev[j] = rdev1;
+ dev[j] = rdev1;
blk_queue_stack_limits(mddev->queue,
rdev1->bdev->bd_disk->queue);
@@ -144,7 +178,7 @@ static int create_strip_zones (mddev_t *mddev)
*/
if (rdev1->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
if (!smallest || (rdev1->sectors < smallest->sectors))
@@ -157,34 +191,32 @@ static int create_strip_zones (mddev_t *mddev)
goto abort;
}
zone->nb_dev = cnt;
- zone->sectors = smallest->sectors * cnt;
- zone->zone_start = 0;
+ zone->zone_end = smallest->sectors * cnt;
- current_start = smallest->sectors;
- curr_zone_start = zone->sectors;
+ curr_zone_end = zone->zone_end;
/* now do the other zones */
for (i = 1; i < conf->nr_strip_zones; i++)
{
zone = conf->strip_zone + i;
- zone->dev = conf->strip_zone[i-1].dev + mddev->raid_disks;
+ dev = conf->devlist + i * mddev->raid_disks;
printk(KERN_INFO "raid0: zone %d\n", i);
- zone->dev_start = current_start;
+ zone->dev_start = smallest->sectors;
smallest = NULL;
c = 0;
for (j=0; j<cnt; j++) {
char b[BDEVNAME_SIZE];
- rdev = conf->strip_zone[0].dev[j];
+ rdev = conf->devlist[j];
printk(KERN_INFO "raid0: checking %s ...",
bdevname(rdev->bdev, b));
- if (rdev->sectors <= current_start) {
+ if (rdev->sectors <= zone->dev_start) {
printk(KERN_INFO " nope.\n");
continue;
}
printk(KERN_INFO " contained as device %d\n", c);
- zone->dev[c] = rdev;
+ dev[c] = rdev;
c++;
if (!smallest || rdev->sectors < smallest->sectors) {
smallest = rdev;
@@ -194,47 +226,39 @@ static int create_strip_zones (mddev_t *mddev)
}
zone->nb_dev = c;
- zone->sectors = (smallest->sectors - current_start) * c;
+ sectors = (smallest->sectors - zone->dev_start) * c;
printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n",
- zone->nb_dev, (unsigned long long)zone->sectors);
+ zone->nb_dev, (unsigned long long)sectors);
- zone->zone_start = curr_zone_start;
- curr_zone_start += zone->sectors;
+ curr_zone_end += sectors;
+ zone->zone_end = curr_zone_end;
- current_start = smallest->sectors;
printk(KERN_INFO "raid0: current zone start: %llu\n",
- (unsigned long long)current_start);
- }
-
- /* Now find appropriate hash spacing.
- * We want a number which causes most hash entries to cover
- * at most two strips, but the hash table must be at most
- * 1 PAGE. We choose the smallest strip, or contiguous collection
- * of strips, that has big enough size. We never consider the last
- * strip though as it's size has no bearing on the efficacy of the hash
- * table.
- */
- conf->spacing = curr_zone_start;
- min_spacing = curr_zone_start;
- sector_div(min_spacing, PAGE_SIZE/sizeof(struct strip_zone*));
- for (i=0; i < conf->nr_strip_zones-1; i++) {
- sector_t s = 0;
- for (j = i; j < conf->nr_strip_zones - 1 &&
- s < min_spacing; j++)
- s += conf->strip_zone[j].sectors;
- if (s >= min_spacing && s < conf->spacing)
- conf->spacing = s;
+ (unsigned long long)smallest->sectors);
}
-
mddev->queue->unplug_fn = raid0_unplug;
-
mddev->queue->backing_dev_info.congested_fn = raid0_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
+ /*
+ * now since we have the hard sector sizes, we can make sure
+ * chunk size is a multiple of that sector size
+ */
+ if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) {
+ printk(KERN_ERR "%s chunk_size of %d not valid\n",
+ mdname(mddev),
+ mddev->chunk_sectors << 9);
+ goto abort;
+ }
printk(KERN_INFO "raid0: done.\n");
+ mddev->private = conf;
return 0;
- abort:
- return 1;
+abort:
+ kfree(conf->strip_zone);
+ kfree(conf->devlist);
+ kfree(conf);
+ mddev->private = NULL;
+ return err;
}
/**
@@ -252,10 +276,15 @@ static int raid0_mergeable_bvec(struct request_queue *q,
mddev_t *mddev = q->queuedata;
sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
int max;
- unsigned int chunk_sectors = mddev->chunk_size >> 9;
+ unsigned int chunk_sectors = mddev->chunk_sectors;
unsigned int bio_sectors = bvm->bi_size >> 9;
- max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
+ if (is_power_of_2(chunk_sectors))
+ max = (chunk_sectors - ((sector & (chunk_sectors-1))
+ + bio_sectors)) << 9;
+ else
+ max = (chunk_sectors - (sector_div(sector, chunk_sectors)
+ + bio_sectors)) << 9;
if (max < 0) max = 0; /* bio_add cannot handle a negative return */
if (max <= biovec->bv_len && bio_sectors == 0)
return biovec->bv_len;
@@ -277,84 +306,28 @@ static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
return array_sectors;
}
-static int raid0_run (mddev_t *mddev)
+static int raid0_run(mddev_t *mddev)
{
- unsigned cur=0, i=0, nb_zone;
- s64 sectors;
- raid0_conf_t *conf;
+ int ret;
- if (mddev->chunk_size == 0) {
- printk(KERN_ERR "md/raid0: non-zero chunk size required.\n");
+ if (mddev->chunk_sectors == 0) {
+ printk(KERN_ERR "md/raid0: chunk size must be set.\n");
return -EINVAL;
}
- printk(KERN_INFO "%s: setting max_sectors to %d, segment boundary to %d\n",
- mdname(mddev),
- mddev->chunk_size >> 9,
- (mddev->chunk_size>>1)-1);
- blk_queue_max_sectors(mddev->queue, mddev->chunk_size >> 9);
- blk_queue_segment_boundary(mddev->queue, (mddev->chunk_size>>1) - 1);
+ if (md_check_no_bitmap(mddev))
+ return -EINVAL;
+ blk_queue_max_sectors(mddev->queue, mddev->chunk_sectors);
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
- conf = kmalloc(sizeof (raid0_conf_t), GFP_KERNEL);
- if (!conf)
- goto out;
- mddev->private = (void *)conf;
-
- conf->strip_zone = NULL;
- conf->devlist = NULL;
- if (create_strip_zones (mddev))
- goto out_free_conf;
+ ret = create_strip_zones(mddev);
+ if (ret < 0)
+ return ret;
/* calculate array device size */
md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
(unsigned long long)mddev->array_sectors);
- printk(KERN_INFO "raid0 : conf->spacing is %llu sectors.\n",
- (unsigned long long)conf->spacing);
- {
- sector_t s = raid0_size(mddev, 0, 0);
- sector_t space = conf->spacing;
- int round;
- conf->sector_shift = 0;
- if (sizeof(sector_t) > sizeof(u32)) {
- /*shift down space and s so that sector_div will work */
- while (space > (sector_t) (~(u32)0)) {
- s >>= 1;
- space >>= 1;
- s += 1; /* force round-up */
- conf->sector_shift++;
- }
- }
- round = sector_div(s, (u32)space) ? 1 : 0;
- nb_zone = s + round;
- }
- printk(KERN_INFO "raid0 : nb_zone is %d.\n", nb_zone);
-
- printk(KERN_INFO "raid0 : Allocating %zu bytes for hash.\n",
- nb_zone*sizeof(struct strip_zone*));
- conf->hash_table = kmalloc (sizeof (struct strip_zone *)*nb_zone, GFP_KERNEL);
- if (!conf->hash_table)
- goto out_free_conf;
- sectors = conf->strip_zone[cur].sectors;
-
- conf->hash_table[0] = conf->strip_zone + cur;
- for (i=1; i< nb_zone; i++) {
- while (sectors <= conf->spacing) {
- cur++;
- sectors += conf->strip_zone[cur].sectors;
- }
- sectors -= conf->spacing;
- conf->hash_table[i] = conf->strip_zone + cur;
- }
- if (conf->sector_shift) {
- conf->spacing >>= conf->sector_shift;
- /* round spacing up so when we divide by it, we
- * err on the side of too-low, which is safest
- */
- conf->spacing++;
- }
-
/* calculate the max read-ahead size.
* For read-ahead of large files to be effective, we need to
* readahead at least twice a whole stripe. i.e. number of devices
@@ -365,48 +338,107 @@ static int raid0_run (mddev_t *mddev)
* chunksize should be used in that case.
*/
{
- int stripe = mddev->raid_disks * mddev->chunk_size / PAGE_SIZE;
+ int stripe = mddev->raid_disks *
+ (mddev->chunk_sectors << 9) / PAGE_SIZE;
if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
mddev->queue->backing_dev_info.ra_pages = 2* stripe;
}
-
blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec);
+ dump_zones(mddev);
return 0;
+}
-out_free_conf:
+static int raid0_stop(mddev_t *mddev)
+{
+ raid0_conf_t *conf = mddev->private;
+
+ blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
kfree(conf->strip_zone);
kfree(conf->devlist);
kfree(conf);
mddev->private = NULL;
-out:
- return -ENOMEM;
+ return 0;
}
-static int raid0_stop (mddev_t *mddev)
+/* Find the zone which holds a particular offset
+ * Update *sectorp to be an offset in that zone
+ */
+static struct strip_zone *find_zone(struct raid0_private_data *conf,
+ sector_t *sectorp)
{
- raid0_conf_t *conf = mddev_to_conf(mddev);
+ int i;
+ struct strip_zone *z = conf->strip_zone;
+ sector_t sector = *sectorp;
+
+ for (i = 0; i < conf->nr_strip_zones; i++)
+ if (sector < z[i].zone_end) {
+ if (i)
+ *sectorp = sector - z[i-1].zone_end;
+ return z + i;
+ }
+ BUG();
+}
- blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
- kfree(conf->hash_table);
- conf->hash_table = NULL;
- kfree(conf->strip_zone);
- conf->strip_zone = NULL;
- kfree(conf);
- mddev->private = NULL;
+/*
+ * remaps the bio to the target device. we separate two flows.
+ * power 2 flow and a general flow for the sake of perfromance
+*/
+static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone,
+ sector_t sector, sector_t *sector_offset)
+{
+ unsigned int sect_in_chunk;
+ sector_t chunk;
+ raid0_conf_t *conf = mddev->private;
+ unsigned int chunk_sects = mddev->chunk_sectors;
+
+ if (is_power_of_2(chunk_sects)) {
+ int chunksect_bits = ffz(~chunk_sects);
+ /* find the sector offset inside the chunk */
+ sect_in_chunk = sector & (chunk_sects - 1);
+ sector >>= chunksect_bits;
+ /* chunk in zone */
+ chunk = *sector_offset;
+ /* quotient is the chunk in real device*/
+ sector_div(chunk, zone->nb_dev << chunksect_bits);
+ } else{
+ sect_in_chunk = sector_div(sector, chunk_sects);
+ chunk = *sector_offset;
+ sector_div(chunk, chunk_sects * zone->nb_dev);
+ }
+ /*
+ * position the bio over the real device
+ * real sector = chunk in device + starting of zone
+ * + the position in the chunk
+ */
+ *sector_offset = (chunk * chunk_sects) + sect_in_chunk;
+ return conf->devlist[(zone - conf->strip_zone)*mddev->raid_disks
+ + sector_div(sector, zone->nb_dev)];
+}
- return 0;
+/*
+ * Is io distribute over 1 or more chunks ?
+*/
+static inline int is_io_in_chunk_boundary(mddev_t *mddev,
+ unsigned int chunk_sects, struct bio *bio)
+{
+ if (likely(is_power_of_2(chunk_sects))) {
+ return chunk_sects >= ((bio->bi_sector & (chunk_sects-1))
+ + (bio->bi_size >> 9));
+ } else{
+ sector_t sector = bio->bi_sector;
+ return chunk_sects >= (sector_div(sector, chunk_sects)
+ + (bio->bi_size >> 9));
+ }
}
-static int raid0_make_request (struct request_queue *q, struct bio *bio)
+static int raid0_make_request(struct request_queue *q, struct bio *bio)
{
mddev_t *mddev = q->queuedata;
- unsigned int sect_in_chunk, chunksect_bits, chunk_sects;
- raid0_conf_t *conf = mddev_to_conf(mddev);
+ unsigned int chunk_sects;
+ sector_t sector_offset;
struct strip_zone *zone;
mdk_rdev_t *tmp_dev;
- sector_t chunk;
- sector_t sector, rsect;
const int rw = bio_data_dir(bio);
int cpu;
@@ -421,11 +453,9 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
bio_sectors(bio));
part_stat_unlock();
- chunk_sects = mddev->chunk_size >> 9;
- chunksect_bits = ffz(~chunk_sects);
- sector = bio->bi_sector;
-
- if (unlikely(chunk_sects < (bio->bi_sector & (chunk_sects - 1)) + (bio->bi_size >> 9))) {
+ chunk_sects = mddev->chunk_sectors;
+ if (unlikely(!is_io_in_chunk_boundary(mddev, chunk_sects, bio))) {
+ sector_t sector = bio->bi_sector;
struct bio_pair *bp;
/* Sanity check -- queue functions should prevent this happening */
if (bio->bi_vcnt != 1 ||
@@ -434,7 +464,12 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
/* This is a one page bio that upper layers
* refuse to split for us, so we need to split it.
*/
- bp = bio_split(bio, chunk_sects - (bio->bi_sector & (chunk_sects - 1)));
+ if (likely(is_power_of_2(chunk_sects)))
+ bp = bio_split(bio, chunk_sects - (sector &
+ (chunk_sects-1)));
+ else
+ bp = bio_split(bio, chunk_sects -
+ sector_div(sector, chunk_sects));
if (raid0_make_request(q, &bp->bio1))
generic_make_request(&bp->bio1);
if (raid0_make_request(q, &bp->bio2))
@@ -443,34 +478,14 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
bio_pair_release(bp);
return 0;
}
-
-
- {
- sector_t x = sector >> conf->sector_shift;
- sector_div(x, (u32)conf->spacing);
- zone = conf->hash_table[x];
- }
- while (sector >= zone->zone_start + zone->sectors)
- zone++;
-
- sect_in_chunk = bio->bi_sector & (chunk_sects - 1);
-
-
- {
- sector_t x = (sector - zone->zone_start) >> chunksect_bits;
-
- sector_div(x, zone->nb_dev);
- chunk = x;
-
- x = sector >> chunksect_bits;
- tmp_dev = zone->dev[sector_div(x, zone->nb_dev)];
- }
- rsect = (chunk << chunksect_bits) + zone->dev_start + sect_in_chunk;
-
+ sector_offset = bio->bi_sector;
+ zone = find_zone(mddev->private, &sector_offset);
+ tmp_dev = map_sector(mddev, zone, bio->bi_sector,
+ &sector_offset);
bio->bi_bdev = tmp_dev->bdev;
- bio->bi_sector = rsect + tmp_dev->data_offset;
-
+ bio->bi_sector = sector_offset + zone->dev_start +
+ tmp_dev->data_offset;
/*
* Let the main block layer submit the IO and resolve recursion:
*/
@@ -485,31 +500,35 @@ bad_map:
return 0;
}
-static void raid0_status (struct seq_file *seq, mddev_t *mddev)
+static void raid0_status(struct seq_file *seq, mddev_t *mddev)
{
#undef MD_DEBUG
#ifdef MD_DEBUG
int j, k, h;
char b[BDEVNAME_SIZE];
- raid0_conf_t *conf = mddev_to_conf(mddev);
+ raid0_conf_t *conf = mddev->private;
+ sector_t zone_size;
+ sector_t zone_start = 0;
h = 0;
+
for (j = 0; j < conf->nr_strip_zones; j++) {
seq_printf(seq, " z%d", j);
- if (conf->hash_table[h] == conf->strip_zone+j)
- seq_printf(seq, "(h%d)", h++);
seq_printf(seq, "=[");
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
seq_printf(seq, "%s/", bdevname(
- conf->strip_zone[j].dev[k]->bdev,b));
-
- seq_printf(seq, "] zs=%d ds=%d s=%d\n",
- conf->strip_zone[j].zone_start,
- conf->strip_zone[j].dev_start,
- conf->strip_zone[j].sectors);
+ conf->devlist[j*mddev->raid_disks + k]
+ ->bdev, b));
+
+ zone_size = conf->strip_zone[j].zone_end - zone_start;
+ seq_printf(seq, "] ze=%lld ds=%lld s=%lld\n",
+ (unsigned long long)zone_start>>1,
+ (unsigned long long)conf->strip_zone[j].dev_start>>1,
+ (unsigned long long)zone_size>>1);
+ zone_start = conf->strip_zone[j].zone_end;
}
#endif
- seq_printf(seq, " %dk chunks", mddev->chunk_size/1024);
+ seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2);
return;
}
diff --git a/drivers/md/raid0.h b/drivers/md/raid0.h
index 824b12e..91f8e87 100644
--- a/drivers/md/raid0.h
+++ b/drivers/md/raid0.h
@@ -3,26 +3,18 @@
struct strip_zone
{
- sector_t zone_start; /* Zone offset in md_dev (in sectors) */
+ sector_t zone_end; /* Start of the next zone (in sectors) */
sector_t dev_start; /* Zone offset in real dev (in sectors) */
- sector_t sectors; /* Zone size in sectors */
int nb_dev; /* # of devices attached to the zone */
- mdk_rdev_t **dev; /* Devices attached to the zone */
};
struct raid0_private_data
{
- struct strip_zone **hash_table; /* Table of indexes into strip_zone */
struct strip_zone *strip_zone;
mdk_rdev_t **devlist; /* lists of rdevs, pointed to by strip_zone->dev */
int nr_strip_zones;
-
- sector_t spacing;
- int sector_shift; /* shift this before divide by spacing */
};
typedef struct raid0_private_data raid0_conf_t;
-#define mddev_to_conf(mddev) ((raid0_conf_t *) mddev->private)
-
#endif
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 36df910..89939a7 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -182,7 +182,7 @@ static void put_all_bios(conf_t *conf, r1bio_t *r1_bio)
static void free_r1bio(r1bio_t *r1_bio)
{
- conf_t *conf = mddev_to_conf(r1_bio->mddev);
+ conf_t *conf = r1_bio->mddev->private;
/*
* Wake up any possible resync thread that waits for the device
@@ -196,7 +196,7 @@ static void free_r1bio(r1bio_t *r1_bio)
static void put_buf(r1bio_t *r1_bio)
{
- conf_t *conf = mddev_to_conf(r1_bio->mddev);
+ conf_t *conf = r1_bio->mddev->private;
int i;
for (i=0; i<conf->raid_disks; i++) {
@@ -214,7 +214,7 @@ static void reschedule_retry(r1bio_t *r1_bio)
{
unsigned long flags;
mddev_t *mddev = r1_bio->mddev;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
spin_lock_irqsave(&conf->device_lock, flags);
list_add(&r1_bio->retry_list, &conf->retry_list);
@@ -253,7 +253,7 @@ static void raid_end_bio_io(r1bio_t *r1_bio)
*/
static inline void update_head_pos(int disk, r1bio_t *r1_bio)
{
- conf_t *conf = mddev_to_conf(r1_bio->mddev);
+ conf_t *conf = r1_bio->mddev->private;
conf->mirrors[disk].head_position =
r1_bio->sector + (r1_bio->sectors);
@@ -264,7 +264,7 @@ static void raid1_end_read_request(struct bio *bio, int error)
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
int mirror;
- conf_t *conf = mddev_to_conf(r1_bio->mddev);
+ conf_t *conf = r1_bio->mddev->private;
mirror = r1_bio->read_disk;
/*
@@ -309,7 +309,7 @@ static void raid1_end_write_request(struct bio *bio, int error)
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state);
- conf_t *conf = mddev_to_conf(r1_bio->mddev);
+ conf_t *conf = r1_bio->mddev->private;
struct bio *to_put = NULL;
@@ -541,7 +541,7 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
static void unplug_slaves(mddev_t *mddev)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i;
rcu_read_lock();
@@ -573,7 +573,7 @@ static void raid1_unplug(struct request_queue *q)
static int raid1_congested(void *data, int bits)
{
mddev_t *mddev = data;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i, ret = 0;
rcu_read_lock();
@@ -772,7 +772,7 @@ do_sync_io:
static int make_request(struct request_queue *q, struct bio * bio)
{
mddev_t *mddev = q->queuedata;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
mirror_info_t *mirror;
r1bio_t *r1_bio;
struct bio *read_bio;
@@ -991,7 +991,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
static void status(struct seq_file *seq, mddev_t *mddev)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i;
seq_printf(seq, " [%d/%d] [", conf->raid_disks,
@@ -1010,7 +1010,7 @@ static void status(struct seq_file *seq, mddev_t *mddev)
static void error(mddev_t *mddev, mdk_rdev_t *rdev)
{
char b[BDEVNAME_SIZE];
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
/*
* If it is not operational, then we have already marked it as dead
@@ -1130,7 +1130,7 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
* a one page request is never in violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
p->head_position = 0;
@@ -1214,7 +1214,7 @@ static void end_sync_write(struct bio *bio, int error)
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
mddev_t *mddev = r1_bio->mddev;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i;
int mirror=0;
@@ -1248,7 +1248,7 @@ static void end_sync_write(struct bio *bio, int error)
static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i;
int disks = conf->raid_disks;
struct bio *bio, *wbio;
@@ -1562,7 +1562,7 @@ static void raid1d(mddev_t *mddev)
r1bio_t *r1_bio;
struct bio *bio;
unsigned long flags;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
int unplug=0;
mdk_rdev_t *rdev;
@@ -1585,7 +1585,7 @@ static void raid1d(mddev_t *mddev)
spin_unlock_irqrestore(&conf->device_lock, flags);
mddev = r1_bio->mddev;
- conf = mddev_to_conf(mddev);
+ conf = mddev->private;
if (test_bit(R1BIO_IsSync, &r1_bio->state)) {
sync_request_write(mddev, r1_bio);
unplug = 1;
@@ -1706,7 +1706,7 @@ static int init_resync(conf_t *conf)
static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
r1bio_t *r1_bio;
struct bio *bio;
sector_t max_sector, nr_sectors;
@@ -1996,7 +1996,7 @@ static int run(mddev_t *mddev)
* a one page request is never in violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
disk->head_position = 0;
@@ -2052,6 +2052,10 @@ static int run(mddev_t *mddev)
goto out_free_conf;
}
+ if (mddev->recovery_cp != MaxSector)
+ printk(KERN_NOTICE "raid1: %s is not clean"
+ " -- starting background reconstruction\n",
+ mdname(mddev));
printk(KERN_INFO
"raid1: raid set %s active with %d out of %d mirrors\n",
mdname(mddev), mddev->raid_disks - mddev->degraded,
@@ -2087,7 +2091,7 @@ out:
static int stop(mddev_t *mddev)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
struct bitmap *bitmap = mddev->bitmap;
int behind_wait = 0;
@@ -2155,16 +2159,16 @@ static int raid1_reshape(mddev_t *mddev)
mempool_t *newpool, *oldpool;
struct pool_info *newpoolinfo;
mirror_info_t *newmirrors;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int cnt, raid_disks;
unsigned long flags;
int d, d2, err;
/* Cannot change chunk_size, layout, or level */
- if (mddev->chunk_size != mddev->new_chunk ||
+ if (mddev->chunk_sectors != mddev->new_chunk_sectors ||
mddev->layout != mddev->new_layout ||
mddev->level != mddev->new_level) {
- mddev->new_chunk = mddev->chunk_size;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->new_layout = mddev->layout;
mddev->new_level = mddev->level;
return -EINVAL;
@@ -2252,7 +2256,7 @@ static int raid1_reshape(mddev_t *mddev)
static void raid1_quiesce(mddev_t *mddev, int state)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
switch(state) {
case 1:
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index 1620eea..e87b84d 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -64,12 +64,6 @@ struct r1_private_data_s {
typedef struct r1_private_data_s conf_t;
/*
- * this is the only point in the RAID code where we violate
- * C type safety. mddev->private is an 'opaque' pointer.
- */
-#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
-
-/*
* this is our 'private' RAID1 bio.
*
* it contains information about what kind of IO operations were started
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 499620a..ae12cea 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -188,7 +188,7 @@ static void put_all_bios(conf_t *conf, r10bio_t *r10_bio)
static void free_r10bio(r10bio_t *r10_bio)
{
- conf_t *conf = mddev_to_conf(r10_bio->mddev);
+ conf_t *conf = r10_bio->mddev->private;
/*
* Wake up any possible resync thread that waits for the device
@@ -202,7 +202,7 @@ static void free_r10bio(r10bio_t *r10_bio)
static void put_buf(r10bio_t *r10_bio)
{
- conf_t *conf = mddev_to_conf(r10_bio->mddev);
+ conf_t *conf = r10_bio->mddev->private;
mempool_free(r10_bio, conf->r10buf_pool);
@@ -213,7 +213,7 @@ static void reschedule_retry(r10bio_t *r10_bio)
{
unsigned long flags;
mddev_t *mddev = r10_bio->mddev;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
spin_lock_irqsave(&conf->device_lock, flags);
list_add(&r10_bio->retry_list, &conf->retry_list);
@@ -245,7 +245,7 @@ static void raid_end_bio_io(r10bio_t *r10_bio)
*/
static inline void update_head_pos(int slot, r10bio_t *r10_bio)
{
- conf_t *conf = mddev_to_conf(r10_bio->mddev);
+ conf_t *conf = r10_bio->mddev->private;
conf->mirrors[r10_bio->devs[slot].devnum].head_position =
r10_bio->devs[slot].addr + (r10_bio->sectors);
@@ -256,7 +256,7 @@ static void raid10_end_read_request(struct bio *bio, int error)
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
int slot, dev;
- conf_t *conf = mddev_to_conf(r10_bio->mddev);
+ conf_t *conf = r10_bio->mddev->private;
slot = r10_bio->read_slot;
@@ -297,7 +297,7 @@ static void raid10_end_write_request(struct bio *bio, int error)
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
int slot, dev;
- conf_t *conf = mddev_to_conf(r10_bio->mddev);
+ conf_t *conf = r10_bio->mddev->private;
for (slot = 0; slot < conf->copies; slot++)
if (r10_bio->devs[slot].bio == bio)
@@ -461,7 +461,7 @@ static int raid10_mergeable_bvec(struct request_queue *q,
mddev_t *mddev = q->queuedata;
sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
int max;
- unsigned int chunk_sectors = mddev->chunk_size >> 9;
+ unsigned int chunk_sectors = mddev->chunk_sectors;
unsigned int bio_sectors = bvm->bi_size >> 9;
max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
@@ -596,7 +596,7 @@ rb_out:
static void unplug_slaves(mddev_t *mddev)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i;
rcu_read_lock();
@@ -628,7 +628,7 @@ static void raid10_unplug(struct request_queue *q)
static int raid10_congested(void *data, int bits)
{
mddev_t *mddev = data;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i, ret = 0;
rcu_read_lock();
@@ -788,7 +788,7 @@ static void unfreeze_array(conf_t *conf)
static int make_request(struct request_queue *q, struct bio * bio)
{
mddev_t *mddev = q->queuedata;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
mirror_info_t *mirror;
r10bio_t *r10_bio;
struct bio *read_bio;
@@ -981,11 +981,11 @@ static int make_request(struct request_queue *q, struct bio * bio)
static void status(struct seq_file *seq, mddev_t *mddev)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i;
if (conf->near_copies < conf->raid_disks)
- seq_printf(seq, " %dK chunks", mddev->chunk_size/1024);
+ seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2);
if (conf->near_copies > 1)
seq_printf(seq, " %d near-copies", conf->near_copies);
if (conf->far_copies > 1) {
@@ -1006,7 +1006,7 @@ static void status(struct seq_file *seq, mddev_t *mddev)
static void error(mddev_t *mddev, mdk_rdev_t *rdev)
{
char b[BDEVNAME_SIZE];
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
/*
* If it is not operational, then we have already marked it as dead
@@ -1158,8 +1158,8 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
* a one page request is never in violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
- mddev->queue->max_sectors = (PAGE_SIZE>>9);
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
+ blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
p->head_position = 0;
rdev->raid_disk = mirror;
@@ -1215,7 +1215,7 @@ abort:
static void end_sync_read(struct bio *bio, int error)
{
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
- conf_t *conf = mddev_to_conf(r10_bio->mddev);
+ conf_t *conf = r10_bio->mddev->private;
int i,d;
for (i=0; i<conf->copies; i++)
@@ -1253,7 +1253,7 @@ static void end_sync_write(struct bio *bio, int error)
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
mddev_t *mddev = r10_bio->mddev;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i,d;
for (i = 0; i < conf->copies; i++)
@@ -1300,7 +1300,7 @@ static void end_sync_write(struct bio *bio, int error)
*/
static void sync_request_write(mddev_t *mddev, r10bio_t *r10_bio)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i, first;
struct bio *tbio, *fbio;
@@ -1400,7 +1400,7 @@ done:
static void recovery_request_write(mddev_t *mddev, r10bio_t *r10_bio)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
int i, d;
struct bio *bio, *wbio;
@@ -1549,7 +1549,7 @@ static void raid10d(mddev_t *mddev)
r10bio_t *r10_bio;
struct bio *bio;
unsigned long flags;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
int unplug=0;
mdk_rdev_t *rdev;
@@ -1572,7 +1572,7 @@ static void raid10d(mddev_t *mddev)
spin_unlock_irqrestore(&conf->device_lock, flags);
mddev = r10_bio->mddev;
- conf = mddev_to_conf(mddev);
+ conf = mddev->private;
if (test_bit(R10BIO_IsSync, &r10_bio->state)) {
sync_request_write(mddev, r10_bio);
unplug = 1;
@@ -1680,7 +1680,7 @@ static int init_resync(conf_t *conf)
static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
r10bio_t *r10_bio;
struct bio *biolist = NULL, *bio;
sector_t max_sector, nr_sectors;
@@ -2026,7 +2026,7 @@ static sector_t
raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
sector_t size;
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
if (!raid_disks)
raid_disks = mddev->raid_disks;
@@ -2050,9 +2050,10 @@ static int run(mddev_t *mddev)
int nc, fc, fo;
sector_t stride, size;
- if (mddev->chunk_size < PAGE_SIZE) {
+ if (mddev->chunk_sectors < (PAGE_SIZE >> 9) ||
+ !is_power_of_2(mddev->chunk_sectors)) {
printk(KERN_ERR "md/raid10: chunk size must be "
- "at least PAGE_SIZE(%ld).\n", PAGE_SIZE);
+ "at least PAGE_SIZE(%ld) and be a power of 2.\n", PAGE_SIZE);
return -EINVAL;
}
@@ -2095,8 +2096,8 @@ static int run(mddev_t *mddev)
conf->far_copies = fc;
conf->copies = nc*fc;
conf->far_offset = fo;
- conf->chunk_mask = (sector_t)(mddev->chunk_size>>9)-1;
- conf->chunk_shift = ffz(~mddev->chunk_size) - 9;
+ conf->chunk_mask = mddev->chunk_sectors - 1;
+ conf->chunk_shift = ffz(~mddev->chunk_sectors);
size = mddev->dev_sectors >> conf->chunk_shift;
sector_div(size, fc);
size = size * conf->raid_disks;
@@ -2145,8 +2146,8 @@ static int run(mddev_t *mddev)
* a one page request is never in violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
- mddev->queue->max_sectors > (PAGE_SIZE>>9))
- mddev->queue->max_sectors = (PAGE_SIZE>>9);
+ queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
+ blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
disk->head_position = 0;
}
@@ -2185,6 +2186,10 @@ static int run(mddev_t *mddev)
goto out_free_conf;
}
+ if (mddev->recovery_cp != MaxSector)
+ printk(KERN_NOTICE "raid10: %s is not clean"
+ " -- starting background reconstruction\n",
+ mdname(mddev));
printk(KERN_INFO
"raid10: raid set %s active with %d out of %d devices\n",
mdname(mddev), mddev->raid_disks - mddev->degraded,
@@ -2204,7 +2209,8 @@ static int run(mddev_t *mddev)
* maybe...
*/
{
- int stripe = conf->raid_disks * (mddev->chunk_size / PAGE_SIZE);
+ int stripe = conf->raid_disks *
+ ((mddev->chunk_sectors << 9) / PAGE_SIZE);
stripe /= conf->near_copies;
if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
mddev->queue->backing_dev_info.ra_pages = 2* stripe;
@@ -2227,7 +2233,7 @@ out:
static int stop(mddev_t *mddev)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
raise_barrier(conf, 0);
lower_barrier(conf);
@@ -2245,7 +2251,7 @@ static int stop(mddev_t *mddev)
static void raid10_quiesce(mddev_t *mddev, int state)
{
- conf_t *conf = mddev_to_conf(mddev);
+ conf_t *conf = mddev->private;
switch(state) {
case 1:
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 244dbe5..59cd1ef 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -62,12 +62,6 @@ struct r10_private_data_s {
typedef struct r10_private_data_s conf_t;
/*
- * this is the only point in the RAID code where we violate
- * C type safety. mddev->private is an 'opaque' pointer.
- */
-#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
-
-/*
* this is our 'private' RAID10 bio.
*
* it contains information about what kind of IO operations were started
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 54ef8d7..cac6f4d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1617,8 +1617,8 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
sector_t new_sector;
int algorithm = previous ? conf->prev_algo
: conf->algorithm;
- int sectors_per_chunk = previous ? (conf->prev_chunk >> 9)
- : (conf->chunk_size >> 9);
+ int sectors_per_chunk = previous ? conf->prev_chunk_sectors
+ : conf->chunk_sectors;
int raid_disks = previous ? conf->previous_raid_disks
: conf->raid_disks;
int data_disks = raid_disks - conf->max_degraded;
@@ -1823,8 +1823,8 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
int raid_disks = sh->disks;
int data_disks = raid_disks - conf->max_degraded;
sector_t new_sector = sh->sector, check;
- int sectors_per_chunk = previous ? (conf->prev_chunk >> 9)
- : (conf->chunk_size >> 9);
+ int sectors_per_chunk = previous ? conf->prev_chunk_sectors
+ : conf->chunk_sectors;
int algorithm = previous ? conf->prev_algo
: conf->algorithm;
sector_t stripe;
@@ -2098,8 +2098,7 @@ static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous,
struct stripe_head *sh)
{
int sectors_per_chunk =
- previous ? (conf->prev_chunk >> 9)
- : (conf->chunk_size >> 9);
+ previous ? conf->prev_chunk_sectors : conf->chunk_sectors;
int dd_idx;
int chunk_offset = sector_div(stripe, sectors_per_chunk);
int disks = previous ? conf->previous_raid_disks : conf->raid_disks;
@@ -3496,7 +3495,7 @@ static void activate_bit_delay(raid5_conf_t *conf)
static void unplug_slaves(mddev_t *mddev)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
int i;
rcu_read_lock();
@@ -3520,7 +3519,7 @@ static void unplug_slaves(mddev_t *mddev)
static void raid5_unplug_device(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
unsigned long flags;
spin_lock_irqsave(&conf->device_lock, flags);
@@ -3539,7 +3538,7 @@ static void raid5_unplug_device(struct request_queue *q)
static int raid5_congested(void *data, int bits)
{
mddev_t *mddev = data;
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
/* No difference between reads and writes. Just check
* how busy the stripe_cache is
@@ -3564,14 +3563,14 @@ static int raid5_mergeable_bvec(struct request_queue *q,
mddev_t *mddev = q->queuedata;
sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
int max;
- unsigned int chunk_sectors = mddev->chunk_size >> 9;
+ unsigned int chunk_sectors = mddev->chunk_sectors;
unsigned int bio_sectors = bvm->bi_size >> 9;
if ((bvm->bi_rw & 1) == WRITE)
return biovec->bv_len; /* always allow writes to be mergeable */
- if (mddev->new_chunk < mddev->chunk_size)
- chunk_sectors = mddev->new_chunk >> 9;
+ if (mddev->new_chunk_sectors < mddev->chunk_sectors)
+ chunk_sectors = mddev->new_chunk_sectors;
max = (chunk_sectors - ((sector & (chunk_sectors - 1)) + bio_sectors)) << 9;
if (max < 0) max = 0;
if (max <= biovec->bv_len && bio_sectors == 0)
@@ -3584,11 +3583,11 @@ static int raid5_mergeable_bvec(struct request_queue *q,
static int in_chunk_boundary(mddev_t *mddev, struct bio *bio)
{
sector_t sector = bio->bi_sector + get_start_sect(bio->bi_bdev);
- unsigned int chunk_sectors = mddev->chunk_size >> 9;
+ unsigned int chunk_sectors = mddev->chunk_sectors;
unsigned int bio_sectors = bio->bi_size >> 9;
- if (mddev->new_chunk < mddev->chunk_size)
- chunk_sectors = mddev->new_chunk >> 9;
+ if (mddev->new_chunk_sectors < mddev->chunk_sectors)
+ chunk_sectors = mddev->new_chunk_sectors;
return chunk_sectors >=
((sector & (chunk_sectors - 1)) + bio_sectors);
}
@@ -3652,7 +3651,7 @@ static void raid5_align_endio(struct bio *bi, int error)
bio_put(bi);
mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata;
- conf = mddev_to_conf(mddev);
+ conf = mddev->private;
rdev = (void*)raid_bi->bi_next;
raid_bi->bi_next = NULL;
@@ -3675,10 +3674,10 @@ static int bio_fits_rdev(struct bio *bi)
{
struct request_queue *q = bdev_get_queue(bi->bi_bdev);
- if ((bi->bi_size>>9) > q->max_sectors)
+ if ((bi->bi_size>>9) > queue_max_sectors(q))
return 0;
blk_recount_segments(q, bi);
- if (bi->bi_phys_segments > q->max_phys_segments)
+ if (bi->bi_phys_segments > queue_max_phys_segments(q))
return 0;
if (q->merge_bvec_fn)
@@ -3694,7 +3693,7 @@ static int bio_fits_rdev(struct bio *bi)
static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio)
{
mddev_t *mddev = q->queuedata;
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
unsigned int dd_idx;
struct bio* align_bi;
mdk_rdev_t *rdev;
@@ -3811,7 +3810,7 @@ static struct stripe_head *__get_priority_stripe(raid5_conf_t *conf)
static int make_request(struct request_queue *q, struct bio * bi)
{
mddev_t *mddev = q->queuedata;
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
int dd_idx;
sector_t new_sector;
sector_t logical_sector, last_sector;
@@ -3908,6 +3907,7 @@ static int make_request(struct request_queue *q, struct bio * bi)
spin_unlock_irq(&conf->device_lock);
if (must_retry) {
release_stripe(sh);
+ schedule();
goto retry;
}
}
@@ -4003,10 +4003,10 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
* If old and new chunk sizes differ, we need to process the
* largest of these
*/
- if (mddev->new_chunk > mddev->chunk_size)
- reshape_sectors = mddev->new_chunk / 512;
+ if (mddev->new_chunk_sectors > mddev->chunk_sectors)
+ reshape_sectors = mddev->new_chunk_sectors;
else
- reshape_sectors = mddev->chunk_size / 512;
+ reshape_sectors = mddev->chunk_sectors;
/* we update the metadata when there is more than 3Meg
* in the block range (that is rather arbitrary, should
@@ -4129,7 +4129,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
1, &dd_idx, NULL);
last_sector =
raid5_compute_sector(conf, ((stripe_addr+reshape_sectors)
- *(new_data_disks) - 1),
+ * new_data_disks - 1),
1, &dd_idx, NULL);
if (last_sector >= mddev->dev_sectors)
last_sector = mddev->dev_sectors - 1;
@@ -4158,7 +4158,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
wait_event(conf->wait_for_overlap,
atomic_read(&conf->reshape_stripes) == 0);
mddev->reshape_position = conf->reshape_progress;
- mddev->curr_resync_completed = mddev->curr_resync;
+ mddev->curr_resync_completed = mddev->curr_resync + reshape_sectors;
conf->reshape_checkpoint = jiffies;
set_bit(MD_CHANGE_DEVS, &mddev->flags);
md_wakeup_thread(mddev->thread);
@@ -4371,7 +4371,7 @@ static void synchronize_stripe_processing(struct list_head *domain)
static void raid5d(mddev_t *mddev)
{
struct stripe_head *sh;
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
int handled;
LIST_HEAD(raid_domain);
@@ -4428,7 +4428,7 @@ static void raid5d(mddev_t *mddev)
static ssize_t
raid5_show_stripe_cache_size(mddev_t *mddev, char *page)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
if (conf)
return sprintf(page, "%d\n", conf->max_nr_stripes);
else
@@ -4438,7 +4438,7 @@ raid5_show_stripe_cache_size(mddev_t *mddev, char *page)
static ssize_t
raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
unsigned long new;
int err;
@@ -4476,7 +4476,7 @@ raid5_stripecache_size = __ATTR(stripe_cache_size, S_IRUGO | S_IWUSR,
static ssize_t
raid5_show_preread_threshold(mddev_t *mddev, char *page)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
if (conf)
return sprintf(page, "%d\n", conf->bypass_threshold);
else
@@ -4486,7 +4486,7 @@ raid5_show_preread_threshold(mddev_t *mddev, char *page)
static ssize_t
raid5_store_preread_threshold(mddev_t *mddev, const char *page, size_t len)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
unsigned long new;
if (len >= PAGE_SIZE)
return -EINVAL;
@@ -4510,7 +4510,7 @@ raid5_preread_bypass_threshold = __ATTR(preread_bypass_threshold,
static ssize_t
stripe_cache_active_show(mddev_t *mddev, char *page)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
if (conf)
return sprintf(page, "%d\n", atomic_read(&conf->active_stripes));
else
@@ -4534,7 +4534,7 @@ static struct attribute_group raid5_attrs_group = {
static sector_t
raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
if (!sectors)
sectors = mddev->dev_sectors;
@@ -4546,8 +4546,8 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
raid_disks = conf->previous_raid_disks;
}
- sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
- sectors &= ~((sector_t)mddev->new_chunk/512 - 1);
+ sectors &= ~((sector_t)mddev->chunk_sectors - 1);
+ sectors &= ~((sector_t)mddev->new_chunk_sectors - 1);
return sectors * (raid_disks - conf->max_degraded);
}
@@ -4691,9 +4691,11 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
return ERR_PTR(-EINVAL);
}
- if (!mddev->new_chunk || mddev->new_chunk % PAGE_SIZE) {
+ if (!mddev->new_chunk_sectors ||
+ (mddev->new_chunk_sectors << 9) % PAGE_SIZE ||
+ !is_power_of_2(mddev->new_chunk_sectors)) {
printk(KERN_ERR "raid5: invalid chunk size %d for %s\n",
- mddev->new_chunk, mdname(mddev));
+ mddev->new_chunk_sectors << 9, mdname(mddev));
return ERR_PTR(-EINVAL);
}
@@ -4756,7 +4758,8 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
conf->fullsync = 1;
}
- conf->chunk_size = mddev->new_chunk;
+ conf->chunk_sectors = mddev->new_chunk_sectors;
+ conf->level = mddev->new_level;
if (conf->level == 6)
conf->max_degraded = 2;
else
@@ -4765,7 +4768,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
conf->max_nr_stripes = NR_STRIPES;
conf->reshape_progress = mddev->reshape_position;
if (conf->reshape_progress != MaxSector) {
- conf->prev_chunk = mddev->chunk_size;
+ conf->prev_chunk_sectors = mddev->chunk_sectors;
conf->prev_algo = mddev->layout;
}
@@ -4803,6 +4806,10 @@ static int run(mddev_t *mddev)
int working_disks = 0;
mdk_rdev_t *rdev;
+ if (mddev->recovery_cp != MaxSector)
+ printk(KERN_NOTICE "raid5: %s is not clean"
+ " -- starting background reconstruction\n",
+ mdname(mddev));
if (mddev->reshape_position != MaxSector) {
/* Check that we can continue the reshape.
* Currently only disks can change, it must
@@ -4825,7 +4832,7 @@ static int run(mddev_t *mddev)
* geometry.
*/
here_new = mddev->reshape_position;
- if (sector_div(here_new, (mddev->new_chunk>>9)*
+ if (sector_div(here_new, mddev->new_chunk_sectors *
(mddev->raid_disks - max_degraded))) {
printk(KERN_ERR "raid5: reshape_position not "
"on a stripe boundary\n");
@@ -4833,7 +4840,7 @@ static int run(mddev_t *mddev)
}
/* here_new is the stripe we will write to */
here_old = mddev->reshape_position;
- sector_div(here_old, (mddev->chunk_size>>9)*
+ sector_div(here_old, mddev->chunk_sectors *
(old_disks-max_degraded));
/* here_old is the first stripe that we might need to read
* from */
@@ -4848,7 +4855,7 @@ static int run(mddev_t *mddev)
} else {
BUG_ON(mddev->level != mddev->new_level);
BUG_ON(mddev->layout != mddev->new_layout);
- BUG_ON(mddev->chunk_size != mddev->new_chunk);
+ BUG_ON(mddev->chunk_sectors != mddev->new_chunk_sectors);
BUG_ON(mddev->delta_disks != 0);
}
@@ -4882,7 +4889,7 @@ static int run(mddev_t *mddev)
}
/* device size must be a multiple of chunk size */
- mddev->dev_sectors &= ~(mddev->chunk_size / 512 - 1);
+ mddev->dev_sectors &= ~(mddev->chunk_sectors - 1);
mddev->resync_max_sectors = mddev->dev_sectors;
if (mddev->degraded > 0 &&
@@ -4931,7 +4938,7 @@ static int run(mddev_t *mddev)
{
int data_disks = conf->previous_raid_disks - conf->max_degraded;
int stripe = data_disks *
- (mddev->chunk_size / PAGE_SIZE);
+ ((mddev->chunk_sectors << 9) / PAGE_SIZE);
if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
}
@@ -5021,7 +5028,8 @@ static void status(struct seq_file *seq, mddev_t *mddev)
raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
int i;
- seq_printf (seq, " level %d, %dk chunk, algorithm %d", mddev->level, mddev->chunk_size >> 10, mddev->layout);
+ seq_printf(seq, " level %d, %dk chunk, algorithm %d", mddev->level,
+ mddev->chunk_sectors / 2, mddev->layout);
seq_printf (seq, " [%d/%d] [", conf->raid_disks, conf->raid_disks - mddev->degraded);
for (i = 0; i < conf->raid_disks; i++)
seq_printf (seq, "%s",
@@ -5169,7 +5177,7 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
- sectors &= ~((sector_t)mddev->chunk_size/512 - 1);
+ sectors &= ~((sector_t)mddev->chunk_sectors - 1);
md_set_array_sectors(mddev, raid5_size(mddev, sectors,
mddev->raid_disks));
if (mddev->array_sectors >
@@ -5186,14 +5194,37 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
return 0;
}
-static int raid5_check_reshape(mddev_t *mddev)
+static int check_stripe_cache(mddev_t *mddev)
+{
+ /* Can only proceed if there are plenty of stripe_heads.
+ * We need a minimum of one full stripe,, and for sensible progress
+ * it is best to have about 4 times that.
+ * If we require 4 times, then the default 256 4K stripe_heads will
+ * allow for chunk sizes up to 256K, which is probably OK.
+ * If the chunk size is greater, user-space should request more
+ * stripe_heads first.
+ */
+ raid5_conf_t *conf = mddev->private;
+ if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
+ > conf->max_nr_stripes ||
+ ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
+ > conf->max_nr_stripes) {
+ printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n",
+ ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9)
+ / STRIPE_SIZE)*4);
+ return 0;
+ }
+ return 1;
+}
+
+static int check_reshape(mddev_t *mddev)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
if (mddev->delta_disks == 0 &&
mddev->new_layout == mddev->layout &&
- mddev->new_chunk == mddev->chunk_size)
- return -EINVAL; /* nothing to do */
+ mddev->new_chunk_sectors == mddev->chunk_sectors)
+ return 0; /* nothing to do */
if (mddev->bitmap)
/* Cannot grow a bitmap yet */
return -EBUSY;
@@ -5212,28 +5243,15 @@ static int raid5_check_reshape(mddev_t *mddev)
return -EINVAL;
}
- /* Can only proceed if there are plenty of stripe_heads.
- * We need a minimum of one full stripe,, and for sensible progress
- * it is best to have about 4 times that.
- * If we require 4 times, then the default 256 4K stripe_heads will
- * allow for chunk sizes up to 256K, which is probably OK.
- * If the chunk size is greater, user-space should request more
- * stripe_heads first.
- */
- if ((mddev->chunk_size / STRIPE_SIZE) * 4 > conf->max_nr_stripes ||
- (mddev->new_chunk / STRIPE_SIZE) * 4 > conf->max_nr_stripes) {
- printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n",
- (max(mddev->chunk_size, mddev->new_chunk)
- / STRIPE_SIZE)*4);
+ if (!check_stripe_cache(mddev))
return -ENOSPC;
- }
return resize_stripes(conf, conf->raid_disks + mddev->delta_disks);
}
static int raid5_start_reshape(mddev_t *mddev)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
mdk_rdev_t *rdev;
int spares = 0;
int added_devices = 0;
@@ -5242,6 +5260,9 @@ static int raid5_start_reshape(mddev_t *mddev)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
+ if (!check_stripe_cache(mddev))
+ return -ENOSPC;
+
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags))
@@ -5268,8 +5289,8 @@ static int raid5_start_reshape(mddev_t *mddev)
spin_lock_irq(&conf->device_lock);
conf->previous_raid_disks = conf->raid_disks;
conf->raid_disks += mddev->delta_disks;
- conf->prev_chunk = conf->chunk_size;
- conf->chunk_size = mddev->new_chunk;
+ conf->prev_chunk_sectors = conf->chunk_sectors;
+ conf->chunk_sectors = mddev->new_chunk_sectors;
conf->prev_algo = conf->algorithm;
conf->algorithm = mddev->new_layout;
if (mddev->delta_disks < 0)
@@ -5351,7 +5372,7 @@ static void end_reshape(raid5_conf_t *conf)
*/
{
int data_disks = conf->raid_disks - conf->max_degraded;
- int stripe = data_disks * (conf->chunk_size
+ int stripe = data_disks * ((conf->chunk_sectors << 9)
/ PAGE_SIZE);
if (conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
@@ -5365,7 +5386,7 @@ static void end_reshape(raid5_conf_t *conf)
static void raid5_finish_reshape(mddev_t *mddev)
{
struct block_device *bdev;
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
@@ -5396,7 +5417,7 @@ static void raid5_finish_reshape(mddev_t *mddev)
raid5_remove_disk(mddev, d);
}
mddev->layout = conf->algorithm;
- mddev->chunk_size = conf->chunk_size;
+ mddev->chunk_sectors = conf->chunk_sectors;
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
}
@@ -5404,7 +5425,7 @@ static void raid5_finish_reshape(mddev_t *mddev)
static void raid5_quiesce(mddev_t *mddev, int state)
{
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
switch(state) {
case 2: /* resume for a suspend */
@@ -5454,7 +5475,7 @@ static void *raid5_takeover_raid1(mddev_t *mddev)
mddev->new_level = 5;
mddev->new_layout = ALGORITHM_LEFT_SYMMETRIC;
- mddev->new_chunk = chunksect << 9;
+ mddev->new_chunk_sectors = chunksect;
return setup_conf(mddev);
}
@@ -5493,24 +5514,24 @@ static void *raid5_takeover_raid6(mddev_t *mddev)
}
-static int raid5_reconfig(mddev_t *mddev, int new_layout, int new_chunk)
+static int raid5_check_reshape(mddev_t *mddev)
{
/* For a 2-drive array, the layout and chunk size can be changed
* immediately as not restriping is needed.
* For larger arrays we record the new value - after validation
* to be used by a reshape pass.
*/
- raid5_conf_t *conf = mddev_to_conf(mddev);
+ raid5_conf_t *conf = mddev->private;
+ int new_chunk = mddev->new_chunk_sectors;
- if (new_layout >= 0 && !algorithm_valid_raid5(new_layout))
+ if (mddev->new_layout >= 0 && !algorithm_valid_raid5(mddev->new_layout))
return -EINVAL;
if (new_chunk > 0) {
- if (new_chunk & (new_chunk-1))
- /* not a power of 2 */
+ if (!is_power_of_2(new_chunk))
return -EINVAL;
- if (new_chunk < PAGE_SIZE)
+ if (new_chunk < (PAGE_SIZE>>9))
return -EINVAL;
- if (mddev->array_sectors & ((new_chunk>>9)-1))
+ if (mddev->array_sectors & (new_chunk-1))
/* not factor of array size */
return -EINVAL;
}
@@ -5518,49 +5539,39 @@ static int raid5_reconfig(mddev_t *mddev, int new_layout, int new_chunk)
/* They look valid */
if (mddev->raid_disks == 2) {
-
- if (new_layout >= 0) {
- conf->algorithm = new_layout;
- mddev->layout = mddev->new_layout = new_layout;
+ /* can make the change immediately */
+ if (mddev->new_layout >= 0) {
+ conf->algorithm = mddev->new_layout;
+ mddev->layout = mddev->new_layout;
}
if (new_chunk > 0) {
- conf->chunk_size = new_chunk;
- mddev->chunk_size = mddev->new_chunk = new_chunk;
+ conf->chunk_sectors = new_chunk ;
+ mddev->chunk_sectors = new_chunk;
}
set_bit(MD_CHANGE_DEVS, &mddev->flags);
md_wakeup_thread(mddev->thread);
- } else {
- if (new_layout >= 0)
- mddev->new_layout = new_layout;
- if (new_chunk > 0)
- mddev->new_chunk = new_chunk;
}
- return 0;
+ return check_reshape(mddev);
}
-static int raid6_reconfig(mddev_t *mddev, int new_layout, int new_chunk)
+static int raid6_check_reshape(mddev_t *mddev)
{
- if (new_layout >= 0 && !algorithm_valid_raid6(new_layout))
+ int new_chunk = mddev->new_chunk_sectors;
+
+ if (mddev->new_layout >= 0 && !algorithm_valid_raid6(mddev->new_layout))
return -EINVAL;
if (new_chunk > 0) {
- if (new_chunk & (new_chunk-1))
- /* not a power of 2 */
+ if (!is_power_of_2(new_chunk))
return -EINVAL;
- if (new_chunk < PAGE_SIZE)
+ if (new_chunk < (PAGE_SIZE >> 9))
return -EINVAL;
- if (mddev->array_sectors & ((new_chunk>>9)-1))
+ if (mddev->array_sectors & (new_chunk-1))
/* not factor of array size */
return -EINVAL;
}
/* They look valid */
-
- if (new_layout >= 0)
- mddev->new_layout = new_layout;
- if (new_chunk > 0)
- mddev->new_chunk = new_chunk;
-
- return 0;
+ return check_reshape(mddev);
}
static void *raid5_takeover(mddev_t *mddev)
@@ -5570,8 +5581,6 @@ static void *raid5_takeover(mddev_t *mddev)
* raid1 - if there are two drives. We need to know the chunk size
* raid4 - trivial - just use a raid4 layout.
* raid6 - Providing it is a *_6 layout
- *
- * For now, just do raid1
*/
if (mddev->level == 1)
@@ -5653,12 +5662,11 @@ static struct mdk_personality raid6_personality =
.sync_request = sync_request,
.resize = raid5_resize,
.size = raid5_size,
- .check_reshape = raid5_check_reshape,
+ .check_reshape = raid6_check_reshape,
.start_reshape = raid5_start_reshape,
.finish_reshape = raid5_finish_reshape,
.quiesce = raid5_quiesce,
.takeover = raid6_takeover,
- .reconfig = raid6_reconfig,
};
static struct mdk_personality raid5_personality =
{
@@ -5681,7 +5689,6 @@ static struct mdk_personality raid5_personality =
.finish_reshape = raid5_finish_reshape,
.quiesce = raid5_quiesce,
.takeover = raid5_takeover,
- .reconfig = raid5_reconfig,
};
static struct mdk_personality raid4_personality =
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 116d0b4..2390e0e 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -337,7 +337,8 @@ struct raid5_private_data {
struct hlist_head *stripe_hashtbl;
mddev_t *mddev;
struct disk_info *spare;
- int chunk_size, level, algorithm;
+ int chunk_sectors;
+ int level, algorithm;
int max_degraded;
int raid_disks;
int max_nr_stripes;
@@ -353,7 +354,8 @@ struct raid5_private_data {
*/
sector_t reshape_safe;
int previous_raid_disks;
- int prev_chunk, prev_algo;
+ int prev_chunk_sectors;
+ int prev_algo;
short generation; /* increments with every reshape */
unsigned long reshape_checkpoint; /* Time we last updated
* metadata */
@@ -424,8 +426,6 @@ struct raid5_private_data {
typedef struct raid5_private_data raid5_conf_t;
-#define mddev_to_conf(mddev) ((raid5_conf_t *) mddev->private)
-
/*
* Our supported algorithms
*/