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path: root/drivers/md/dm-log.c
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Diffstat (limited to 'drivers/md/dm-log.c')
-rw-r--r--drivers/md/dm-log.c77
1 files changed, 64 insertions, 13 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 9443896..7035582 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -145,8 +145,9 @@ int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type)
EXPORT_SYMBOL(dm_dirty_log_type_unregister);
struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
- struct dm_target *ti,
- unsigned int argc, char **argv)
+ struct dm_target *ti,
+ int (*flush_callback_fn)(struct dm_target *ti),
+ unsigned int argc, char **argv)
{
struct dm_dirty_log_type *type;
struct dm_dirty_log *log;
@@ -161,6 +162,7 @@ struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
return NULL;
}
+ log->flush_callback_fn = flush_callback_fn;
log->type = type;
if (type->ctr(log, ti, argc, argv)) {
kfree(log);
@@ -208,7 +210,9 @@ struct log_header {
struct log_c {
struct dm_target *ti;
- int touched;
+ int touched_dirtied;
+ int touched_cleaned;
+ int flush_failed;
uint32_t region_size;
unsigned int region_count;
region_t sync_count;
@@ -233,6 +237,7 @@ struct log_c {
* Disk log fields
*/
int log_dev_failed;
+ int log_dev_flush_failed;
struct dm_dev *log_dev;
struct log_header header;
@@ -253,14 +258,14 @@ static inline void log_set_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
ext2_set_bit(bit, (unsigned long *) bs);
- l->touched = 1;
+ l->touched_cleaned = 1;
}
static inline void log_clear_bit(struct log_c *l,
uint32_t *bs, unsigned bit)
{
ext2_clear_bit(bit, (unsigned long *) bs);
- l->touched = 1;
+ l->touched_dirtied = 1;
}
/*----------------------------------------------------------------
@@ -287,6 +292,19 @@ static int rw_header(struct log_c *lc, int rw)
return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
}
+static int flush_header(struct log_c *lc)
+{
+ struct dm_io_region null_location = {
+ .bdev = lc->header_location.bdev,
+ .sector = 0,
+ .count = 0,
+ };
+
+ lc->io_req.bi_rw = WRITE_BARRIER;
+
+ return dm_io(&lc->io_req, 1, &null_location, NULL);
+}
+
static int read_header(struct log_c *log)
{
int r;
@@ -378,7 +396,9 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
}
lc->ti = ti;
- lc->touched = 0;
+ lc->touched_dirtied = 0;
+ lc->touched_cleaned = 0;
+ lc->flush_failed = 0;
lc->region_size = region_size;
lc->region_count = region_count;
lc->sync = sync;
@@ -406,6 +426,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
} else {
lc->log_dev = dev;
lc->log_dev_failed = 0;
+ lc->log_dev_flush_failed = 0;
lc->header_location.bdev = lc->log_dev->bdev;
lc->header_location.sector = 0;
@@ -614,6 +635,11 @@ static int disk_resume(struct dm_dirty_log *log)
/* write the new header */
r = rw_header(lc, WRITE);
+ if (!r) {
+ r = flush_header(lc);
+ if (r)
+ lc->log_dev_flush_failed = 1;
+ }
if (r) {
DMWARN("%s: Failed to write header on dirty region log device",
lc->log_dev->name);
@@ -656,18 +682,40 @@ static int core_flush(struct dm_dirty_log *log)
static int disk_flush(struct dm_dirty_log *log)
{
- int r;
- struct log_c *lc = (struct log_c *) log->context;
+ int r, i;
+ struct log_c *lc = log->context;
/* only write if the log has changed */
- if (!lc->touched)
+ if (!lc->touched_cleaned && !lc->touched_dirtied)
return 0;
+ if (lc->touched_cleaned && log->flush_callback_fn &&
+ log->flush_callback_fn(lc->ti)) {
+ /*
+ * At this point it is impossible to determine which
+ * regions are clean and which are dirty (without
+ * re-reading the log off disk). So mark all of them
+ * dirty.
+ */
+ lc->flush_failed = 1;
+ for (i = 0; i < lc->region_count; i++)
+ log_clear_bit(lc, lc->clean_bits, i);
+ }
+
r = rw_header(lc, WRITE);
if (r)
fail_log_device(lc);
- else
- lc->touched = 0;
+ else {
+ if (lc->touched_dirtied) {
+ r = flush_header(lc);
+ if (r) {
+ lc->log_dev_flush_failed = 1;
+ fail_log_device(lc);
+ } else
+ lc->touched_dirtied = 0;
+ }
+ lc->touched_cleaned = 0;
+ }
return r;
}
@@ -681,7 +729,8 @@ static void core_mark_region(struct dm_dirty_log *log, region_t region)
static void core_clear_region(struct dm_dirty_log *log, region_t region)
{
struct log_c *lc = (struct log_c *) log->context;
- log_set_bit(lc, lc->clean_bits, region);
+ if (likely(!lc->flush_failed))
+ log_set_bit(lc, lc->clean_bits, region);
}
static int core_get_resync_work(struct dm_dirty_log *log, region_t *region)
@@ -762,7 +811,9 @@ static int disk_status(struct dm_dirty_log *log, status_type_t status,
switch(status) {
case STATUSTYPE_INFO:
DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name,
- lc->log_dev_failed ? 'D' : 'A');
+ lc->log_dev_flush_failed ? 'F' :
+ lc->log_dev_failed ? 'D' :
+ 'A');
break;
case STATUSTYPE_TABLE: