diff options
Diffstat (limited to 'drivers/md')
-rw-r--r-- | drivers/md/dm-ioctl.c | 2 | ||||
-rw-r--r-- | drivers/md/dm-mpath.c | 351 | ||||
-rw-r--r-- | drivers/md/dm-raid.c | 7 | ||||
-rw-r--r-- | drivers/md/dm-thin.c | 165 | ||||
-rw-r--r-- | drivers/md/dm.c | 10 |
5 files changed, 281 insertions, 254 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 2adf81d..2c7ca25 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1723,7 +1723,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern if (!dmi) { unsigned noio_flag; noio_flag = memalloc_noio_save(); - dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL); + dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL); memalloc_noio_restore(noio_flag); if (dmi) *param_flags |= DM_PARAMS_VMALLOC; diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 677ba22..52baf8a 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -76,26 +76,18 @@ struct multipath { wait_queue_head_t pg_init_wait; /* Wait for pg_init completion */ - unsigned pg_init_in_progress; /* Only one pg_init allowed at once */ - - unsigned nr_valid_paths; /* Total number of usable paths */ struct pgpath *current_pgpath; struct priority_group *current_pg; struct priority_group *next_pg; /* Switch to this PG if set */ - bool queue_io:1; /* Must we queue all I/O? */ - bool queue_if_no_path:1; /* Queue I/O if last path fails? */ - bool saved_queue_if_no_path:1; /* Saved state during suspension */ - bool retain_attached_hw_handler:1; /* If there's already a hw_handler present, don't change it. */ - bool pg_init_disabled:1; /* pg_init is not currently allowed */ - bool pg_init_required:1; /* pg_init needs calling? */ - bool pg_init_delay_retry:1; /* Delay pg_init retry? */ + unsigned long flags; /* Multipath state flags */ unsigned pg_init_retries; /* Number of times to retry pg_init */ - unsigned pg_init_count; /* Number of times pg_init called */ unsigned pg_init_delay_msecs; /* Number of msecs before pg_init retry */ - struct work_struct trigger_event; + atomic_t nr_valid_paths; /* Total number of usable paths */ + atomic_t pg_init_in_progress; /* Only one pg_init allowed at once */ + atomic_t pg_init_count; /* Number of times pg_init called */ /* * We must use a mempool of dm_mpath_io structs so that we @@ -104,6 +96,7 @@ struct multipath { mempool_t *mpio_pool; struct mutex work_mutex; + struct work_struct trigger_event; }; /* @@ -122,6 +115,17 @@ static struct workqueue_struct *kmultipathd, *kmpath_handlerd; static void trigger_event(struct work_struct *work); static void activate_path(struct work_struct *work); +/*----------------------------------------------- + * Multipath state flags. + *-----------------------------------------------*/ + +#define MPATHF_QUEUE_IO 0 /* Must we queue all I/O? */ +#define MPATHF_QUEUE_IF_NO_PATH 1 /* Queue I/O if last path fails? */ +#define MPATHF_SAVED_QUEUE_IF_NO_PATH 2 /* Saved state during suspension */ +#define MPATHF_RETAIN_ATTACHED_HW_HANDLER 3 /* If there's already a hw_handler present, don't change it. */ +#define MPATHF_PG_INIT_DISABLED 4 /* pg_init is not currently allowed */ +#define MPATHF_PG_INIT_REQUIRED 5 /* pg_init needs calling? */ +#define MPATHF_PG_INIT_DELAY_RETRY 6 /* Delay pg_init retry? */ /*----------------------------------------------- * Allocation routines @@ -189,7 +193,10 @@ static struct multipath *alloc_multipath(struct dm_target *ti, bool use_blk_mq) if (m) { INIT_LIST_HEAD(&m->priority_groups); spin_lock_init(&m->lock); - m->queue_io = true; + set_bit(MPATHF_QUEUE_IO, &m->flags); + atomic_set(&m->nr_valid_paths, 0); + atomic_set(&m->pg_init_in_progress, 0); + atomic_set(&m->pg_init_count, 0); m->pg_init_delay_msecs = DM_PG_INIT_DELAY_DEFAULT; INIT_WORK(&m->trigger_event, trigger_event); init_waitqueue_head(&m->pg_init_wait); @@ -274,17 +281,17 @@ static int __pg_init_all_paths(struct multipath *m) struct pgpath *pgpath; unsigned long pg_init_delay = 0; - if (m->pg_init_in_progress || m->pg_init_disabled) + if (atomic_read(&m->pg_init_in_progress) || test_bit(MPATHF_PG_INIT_DISABLED, &m->flags)) return 0; - m->pg_init_count++; - m->pg_init_required = false; + atomic_inc(&m->pg_init_count); + clear_bit(MPATHF_PG_INIT_REQUIRED, &m->flags); /* Check here to reset pg_init_required */ if (!m->current_pg) return 0; - if (m->pg_init_delay_retry) + if (test_bit(MPATHF_PG_INIT_DELAY_RETRY, &m->flags)) pg_init_delay = msecs_to_jiffies(m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT ? m->pg_init_delay_msecs : DM_PG_INIT_DELAY_MSECS); list_for_each_entry(pgpath, &m->current_pg->pgpaths, list) { @@ -293,65 +300,99 @@ static int __pg_init_all_paths(struct multipath *m) continue; if (queue_delayed_work(kmpath_handlerd, &pgpath->activate_path, pg_init_delay)) - m->pg_init_in_progress++; + atomic_inc(&m->pg_init_in_progress); } - return m->pg_init_in_progress; + return atomic_read(&m->pg_init_in_progress); +} + +static int pg_init_all_paths(struct multipath *m) +{ + int r; + unsigned long flags; + + spin_lock_irqsave(&m->lock, flags); + r = __pg_init_all_paths(m); + spin_unlock_irqrestore(&m->lock, flags); + + return r; } -static void __switch_pg(struct multipath *m, struct pgpath *pgpath) +static void __switch_pg(struct multipath *m, struct priority_group *pg) { - m->current_pg = pgpath->pg; + m->current_pg = pg; /* Must we initialise the PG first, and queue I/O till it's ready? */ if (m->hw_handler_name) { - m->pg_init_required = true; - m->queue_io = true; + set_bit(MPATHF_PG_INIT_REQUIRED, &m->flags); + set_bit(MPATHF_QUEUE_IO, &m->flags); } else { - m->pg_init_required = false; - m->queue_io = false; + clear_bit(MPATHF_PG_INIT_REQUIRED, &m->flags); + clear_bit(MPATHF_QUEUE_IO, &m->flags); } - m->pg_init_count = 0; + atomic_set(&m->pg_init_count, 0); } -static int __choose_path_in_pg(struct multipath *m, struct priority_group *pg, - size_t nr_bytes) +static struct pgpath *choose_path_in_pg(struct multipath *m, + struct priority_group *pg, + size_t nr_bytes) { + unsigned long flags; struct dm_path *path; + struct pgpath *pgpath; path = pg->ps.type->select_path(&pg->ps, nr_bytes); if (!path) - return -ENXIO; + return ERR_PTR(-ENXIO); - m->current_pgpath = path_to_pgpath(path); + pgpath = path_to_pgpath(path); - if (m->current_pg != pg) - __switch_pg(m, m->current_pgpath); + if (unlikely(lockless_dereference(m->current_pg) != pg)) { + /* Only update current_pgpath if pg changed */ + spin_lock_irqsave(&m->lock, flags); + m->current_pgpath = pgpath; + __switch_pg(m, pg); + spin_unlock_irqrestore(&m->lock, flags); + } - return 0; + return pgpath; } -static void __choose_pgpath(struct multipath *m, size_t nr_bytes) +static struct pgpath *choose_pgpath(struct multipath *m, size_t nr_bytes) { + unsigned long flags; struct priority_group *pg; + struct pgpath *pgpath; bool bypassed = true; - if (!m->nr_valid_paths) { - m->queue_io = false; + if (!atomic_read(&m->nr_valid_paths)) { + clear_bit(MPATHF_QUEUE_IO, &m->flags); goto failed; } /* Were we instructed to switch PG? */ - if (m->next_pg) { + if (lockless_dereference(m->next_pg)) { + spin_lock_irqsave(&m->lock, flags); pg = m->next_pg; + if (!pg) { + spin_unlock_irqrestore(&m->lock, flags); + goto check_current_pg; + } m->next_pg = NULL; - if (!__choose_path_in_pg(m, pg, nr_bytes)) - return; + spin_unlock_irqrestore(&m->lock, flags); + pgpath = choose_path_in_pg(m, pg, nr_bytes); + if (!IS_ERR_OR_NULL(pgpath)) + return pgpath; } /* Don't change PG until it has no remaining paths */ - if (m->current_pg && !__choose_path_in_pg(m, m->current_pg, nr_bytes)) - return; +check_current_pg: + pg = lockless_dereference(m->current_pg); + if (pg) { + pgpath = choose_path_in_pg(m, pg, nr_bytes); + if (!IS_ERR_OR_NULL(pgpath)) + return pgpath; + } /* * Loop through priority groups until we find a valid path. @@ -363,34 +404,38 @@ static void __choose_pgpath(struct multipath *m, size_t nr_bytes) list_for_each_entry(pg, &m->priority_groups, list) { if (pg->bypassed == bypassed) continue; - if (!__choose_path_in_pg(m, pg, nr_bytes)) { + pgpath = choose_path_in_pg(m, pg, nr_bytes); + if (!IS_ERR_OR_NULL(pgpath)) { if (!bypassed) - m->pg_init_delay_retry = true; - return; + set_bit(MPATHF_PG_INIT_DELAY_RETRY, &m->flags); + return pgpath; } } } while (bypassed--); failed: + spin_lock_irqsave(&m->lock, flags); m->current_pgpath = NULL; m->current_pg = NULL; + spin_unlock_irqrestore(&m->lock, flags); + + return NULL; } /* * Check whether bios must be queued in the device-mapper core rather * than here in the target. * - * m->lock must be held on entry. - * * If m->queue_if_no_path and m->saved_queue_if_no_path hold the * same value then we are not between multipath_presuspend() * and multipath_resume() calls and we have no need to check * for the DMF_NOFLUSH_SUSPENDING flag. */ -static int __must_push_back(struct multipath *m) +static int must_push_back(struct multipath *m) { - return (m->queue_if_no_path || - (m->queue_if_no_path != m->saved_queue_if_no_path && + return (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) || + ((test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) != + test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags)) && dm_noflush_suspending(m->ti))); } @@ -408,35 +453,31 @@ static int __multipath_map(struct dm_target *ti, struct request *clone, struct block_device *bdev; struct dm_mpath_io *mpio; - spin_lock_irq(&m->lock); - /* Do we need to select a new pgpath? */ - if (!m->current_pgpath || !m->queue_io) - __choose_pgpath(m, nr_bytes); - - pgpath = m->current_pgpath; + pgpath = lockless_dereference(m->current_pgpath); + if (!pgpath || !test_bit(MPATHF_QUEUE_IO, &m->flags)) + pgpath = choose_pgpath(m, nr_bytes); if (!pgpath) { - if (!__must_push_back(m)) + if (!must_push_back(m)) r = -EIO; /* Failed */ - goto out_unlock; - } else if (m->queue_io || m->pg_init_required) { - __pg_init_all_paths(m); - goto out_unlock; + return r; + } else if (test_bit(MPATHF_QUEUE_IO, &m->flags) || + test_bit(MPATHF_PG_INIT_REQUIRED, &m->flags)) { + pg_init_all_paths(m); + return r; } mpio = set_mpio(m, map_context); if (!mpio) /* ENOMEM, requeue */ - goto out_unlock; + return r; mpio->pgpath = pgpath; mpio->nr_bytes = nr_bytes; bdev = pgpath->path.dev->bdev; - spin_unlock_irq(&m->lock); - if (clone) { /* * Old request-based interface: allocated clone is passed in. @@ -468,11 +509,6 @@ static int __multipath_map(struct dm_target *ti, struct request *clone, &pgpath->path, nr_bytes); return DM_MAPIO_REMAPPED; - -out_unlock: - spin_unlock_irq(&m->lock); - - return r; } static int multipath_map(struct dm_target *ti, struct request *clone, @@ -503,11 +539,22 @@ static int queue_if_no_path(struct multipath *m, bool queue_if_no_path, spin_lock_irqsave(&m->lock, flags); - if (save_old_value) - m->saved_queue_if_no_path = m->queue_if_no_path; + if (save_old_value) { + if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) + set_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags); + else + clear_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags); + } else { + if (queue_if_no_path) + set_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags); + else + clear_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags); + } + if (queue_if_no_path) + set_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags); else - m->saved_queue_if_no_path = queue_if_no_path; - m->queue_if_no_path = queue_if_no_path; + clear_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags); + spin_unlock_irqrestore(&m->lock, flags); if (!queue_if_no_path) @@ -600,10 +647,10 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps goto bad; } - if (m->retain_attached_hw_handler || m->hw_handler_name) + if (test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags) || m->hw_handler_name) q = bdev_get_queue(p->path.dev->bdev); - if (m->retain_attached_hw_handler) { + if (test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags)) { retain: attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL); if (attached_handler_name) { @@ -808,7 +855,7 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m) } if (!strcasecmp(arg_name, "retain_attached_hw_handler")) { - m->retain_attached_hw_handler = true; + set_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags); continue; } @@ -884,6 +931,7 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc, /* parse the priority groups */ while (as.argc) { struct priority_group *pg; + unsigned nr_valid_paths = atomic_read(&m->nr_valid_paths); pg = parse_priority_group(&as, m); if (IS_ERR(pg)) { @@ -891,7 +939,9 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc, goto bad; } - m->nr_valid_paths += pg->nr_pgpaths; + nr_valid_paths += pg->nr_pgpaths; + atomic_set(&m->nr_valid_paths, nr_valid_paths); + list_add_tail(&pg->list, &m->priority_groups); pg_count++; pg->pg_num = pg_count; @@ -921,19 +971,14 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc, static void multipath_wait_for_pg_init_completion(struct multipath *m) { DECLARE_WAITQUEUE(wait, current); - unsigned long flags; add_wait_queue(&m->pg_init_wait, &wait); while (1) { set_current_state(TASK_UNINTERRUPTIBLE); - spin_lock_irqsave(&m->lock, flags); - if (!m->pg_init_in_progress) { - spin_unlock_irqrestore(&m->lock, flags); + if (!atomic_read(&m->pg_init_in_progress)) break; - } - spin_unlock_irqrestore(&m->lock, flags); io_schedule(); } @@ -944,20 +989,16 @@ static void multipath_wait_for_pg_init_completion(struct multipath *m) static void flush_multipath_work(struct multipath *m) { - unsigned long flags; - - spin_lock_irqsave(&m->lock, flags); - m->pg_init_disabled = true; - spin_unlock_irqrestore(&m->lock, flags); + set_bit(MPATHF_PG_INIT_DISABLED, &m->flags); + smp_mb__after_atomic(); flush_workqueue(kmpath_handlerd); multipath_wait_for_pg_init_completion(m); flush_workqueue(kmultipathd); flush_work(&m->trigger_event); - spin_lock_irqsave(&m->lock, flags); - m->pg_init_disabled = false; - spin_unlock_irqrestore(&m->lock, flags); + clear_bit(MPATHF_PG_INIT_DISABLED, &m->flags); + smp_mb__after_atomic(); } static void multipath_dtr(struct dm_target *ti) @@ -987,13 +1028,13 @@ static int fail_path(struct pgpath *pgpath) pgpath->is_active = false; pgpath->fail_count++; - m->nr_valid_paths--; + atomic_dec(&m->nr_valid_paths); if (pgpath == m->current_pgpath) m->current_pgpath = NULL; dm_path_uevent(DM_UEVENT_PATH_FAILED, m->ti, - pgpath->path.dev->name, m->nr_valid_paths); + pgpath->path.dev->name, atomic_read(&m->nr_valid_paths)); schedule_work(&m->trigger_event); @@ -1011,6 +1052,7 @@ static int reinstate_path(struct pgpath *pgpath) int r = 0, run_queue = 0; unsigned long flags; struct multipath *m = pgpath->pg->m; + unsigned nr_valid_paths; spin_lock_irqsave(&m->lock, flags); @@ -1025,16 +1067,17 @@ static int reinstate_path(struct pgpath *pgpath) pgpath->is_active = true; - if (!m->nr_valid_paths++) { + nr_valid_paths = atomic_inc_return(&m->nr_valid_paths); + if (nr_valid_paths == 1) { m->current_pgpath = NULL; run_queue = 1; } else if (m->hw_handler_name && (m->current_pg == pgpath->pg)) { if (queue_work(kmpath_handlerd, &pgpath->activate_path.work)) - m->pg_init_in_progress++; + atomic_inc(&m->pg_init_in_progress); } dm_path_uevent(DM_UEVENT_PATH_REINSTATED, m->ti, - pgpath->path.dev->name, m->nr_valid_paths); + pgpath->path.dev->name, nr_valid_paths); schedule_work(&m->trigger_event); @@ -1152,8 +1195,9 @@ static bool pg_init_limit_reached(struct multipath *m, struct pgpath *pgpath) spin_lock_irqsave(&m->lock, flags); - if (m->pg_init_count <= m->pg_init_retries && !m->pg_init_disabled) - m->pg_init_required = true; + if (atomic_read(&m->pg_init_count) <= m->pg_init_retries && + !test_bit(MPATHF_PG_INIT_DISABLED, &m->flags)) + set_bit(MPATHF_PG_INIT_REQUIRED, &m->flags); else limit_reached = true; @@ -1219,19 +1263,23 @@ static void pg_init_done(void *data, int errors) m->current_pgpath = NULL; m->current_pg = NULL; } - } else if (!m->pg_init_required) + } else if (!test_bit(MPATHF_PG_INIT_REQUIRED, &m->flags)) pg->bypassed = false; - if (--m->pg_init_in_progress) + if (atomic_dec_return(&m->pg_init_in_progress) > 0) /* Activations of other paths are still on going */ goto out; - if (m->pg_init_required) { - m->pg_init_delay_retry = delay_retry; + if (test_bit(MPATHF_PG_INIT_REQUIRED, &m->flags)) { + if (delay_retry) + set_bit(MPATHF_PG_INIT_DELAY_RETRY, &m->flags); + else + clear_bit(MPATHF_PG_INIT_DELAY_RETRY, &m->flags); + if (__pg_init_all_paths(m)) goto out; } - m->queue_io = false; + clear_bit(MPATHF_QUEUE_IO, &m->flags); /* * Wake up any thread waiting to suspend. @@ -1287,7 +1335,6 @@ static int do_end_io(struct multipath *m, struct request *clone, * clone bios for it and resubmit it later. */ int r = DM_ENDIO_REQUEUE; - unsigned long flags; if (!error && !clone->errors) return 0; /* I/O complete */ @@ -1298,17 +1345,15 @@ static int do_end_io(struct multipath *m, struct request *clone, if (mpio->pgpath) fail_path(mpio->pgpath); - spin_lock_irqsave(&m->lock, flags); - if (!m->nr_valid_paths) { - if (!m->queue_if_no_path) { - if (!__must_push_back(m)) + if (!atomic_read(&m->nr_valid_paths)) { + if (!test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) { + if (!must_push_back(m)) r = -EIO; } else { if (error == -EBADE) r = error; } } - spin_unlock_irqrestore(&m->lock, flags); return r; } @@ -1364,11 +1409,12 @@ static void multipath_postsuspend(struct dm_target *ti) static void multipath_resume(struct dm_target *ti) { struct multipath *m = ti->private; - unsigned long flags; - spin_lock_irqsave(&m->lock, flags); - m->queue_if_no_path = m->saved_queue_if_no_path; - spin_unlock_irqrestore(&m->lock, flags); + if (test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags)) + set_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags); + else + clear_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags); + smp_mb__after_atomic(); } /* @@ -1402,19 +1448,20 @@ static void multipath_status(struct dm_target *ti, status_type_t type, /* Features */ if (type == STATUSTYPE_INFO) - DMEMIT("2 %u %u ", m->queue_io, m->pg_init_count); + DMEMIT("2 %u %u ", test_bit(MPATHF_QUEUE_IO, &m->flags), + atomic_read(&m->pg_init_count)); else { - DMEMIT("%u ", m->queue_if_no_path + + DMEMIT("%u ", test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) + (m->pg_init_retries > 0) * 2 + (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT) * 2 + - m->retain_attached_hw_handler); - if (m->queue_if_no_path) + test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags)); + if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) DMEMIT("queue_if_no_path "); if (m->pg_init_retries) DMEMIT("pg_init_retries %u ", m->pg_init_retries); if (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT) DMEMIT("pg_init_delay_msecs %u ", m->pg_init_delay_msecs); - if (m->retain_attached_hw_handler) + if (test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags)) DMEMIT("retain_attached_hw_handler "); } @@ -1563,18 +1610,17 @@ static int multipath_prepare_ioctl(struct dm_target *ti, struct block_device **bdev, fmode_t *mode) { struct multipath *m = ti->private; - unsigned long flags; + struct pgpath *current_pgpath; int r; - spin_lock_irqsave(&m->lock, flags); + current_pgpath = lockless_dereference(m->current_pgpath); + if (!current_pgpath) + current_pgpath = choose_pgpath(m, 0); - if (!m->current_pgpath) - __choose_pgpath(m, 0); - - if (m->current_pgpath) { - if (!m->queue_io) { - *bdev = m->current_pgpath->path.dev->bdev; - *mode = m->current_pgpath->path.dev->mode; + if (current_pgpath) { + if (!test_bit(MPATHF_QUEUE_IO, &m->flags)) { + *bdev = current_pgpath->path.dev->bdev; + *mode = current_pgpath->path.dev->mode; r = 0; } else { /* pg_init has not started or completed */ @@ -1582,23 +1628,19 @@ static int multipath_prepare_ioctl(struct dm_target *ti, } } else { /* No path is available */ - if (m->queue_if_no_path) + if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) r = -ENOTCONN; else r = -EIO; } - spin_unlock_irqrestore(&m->lock, flags); - if (r == -ENOTCONN) { - spin_lock_irqsave(&m->lock, flags); - if (!m->current_pg) { + if (!lockless_dereference(m->current_pg)) { /* Path status changed, redo selection */ - __choose_pgpath(m, 0); + (void) choose_pgpath(m, 0); } - if (m->pg_init_required) - __pg_init_all_paths(m); - spin_unlock_irqrestore(&m->lock, flags); + if (test_bit(MPATHF_PG_INIT_REQUIRED, &m->flags)) + pg_init_all_paths(m); dm_table_run_md_queue_async(m->ti->table); } @@ -1649,39 +1691,37 @@ static int multipath_busy(struct dm_target *ti) { bool busy = false, has_active = false; struct multipath *m = ti->private; - struct priority_group *pg; + struct priority_group *pg, *next_pg; struct pgpath *pgpath; - unsigned long flags; - - spin_lock_irqsave(&m->lock, flags); /* pg_init in progress or no paths available */ - if (m->pg_init_in_progress || - (!m->nr_valid_paths && m->queue_if_no_path)) { - busy = true; - goto out; - } + if (atomic_read(&m->pg_init_in_progress) || + (!atomic_read(&m->nr_valid_paths) && test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))) + return true; + /* 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 + pg = lockless_dereference(m->current_pg); + next_pg = lockless_dereference(m->next_pg); + if (unlikely(!lockless_dereference(m->current_pgpath) && next_pg)) + pg = next_pg; + + if (!pg) { /* * We don't know which pg will be used at next mapping time. - * We don't call __choose_pgpath() here to avoid to trigger + * 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; + return busy; + } /* * 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 = true; - list_for_each_entry(pgpath, &pg->pgpaths, list) + list_for_each_entry(pgpath, &pg->pgpaths, list) { if (pgpath->is_active) { has_active = true; if (!pgpath_busy(pgpath)) { @@ -1689,17 +1729,16 @@ static int multipath_busy(struct dm_target *ti) break; } } + } - if (!has_active) + 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 = false; - -out: - spin_unlock_irqrestore(&m->lock, flags); + } return busy; } diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index a090121..5253274 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -1037,6 +1037,11 @@ static int super_validate(struct raid_set *rs, struct md_rdev *rdev) if (!mddev->events && super_init_validation(mddev, rdev)) return -EINVAL; + if (le32_to_cpu(sb->features)) { + rs->ti->error = "Unable to assemble array: No feature flags supported yet"; + return -EINVAL; + } + /* Enable bitmap creation for RAID levels != 0 */ mddev->bitmap_info.offset = (rs->raid_type->level) ? to_sector(4096) : 0; rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; @@ -1718,7 +1723,7 @@ static void raid_resume(struct dm_target *ti) static struct target_type raid_target = { .name = "raid", - .version = {1, 7, 0}, + .version = {1, 8, 0}, .module = THIS_MODULE, .ctr = raid_ctr, .dtr = raid_dtr, diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 92237b6..fc803d5 100644 --- a/drivers/md/dm-thin.c +++ b/drivers/md/dm-thin.c @@ -322,56 +322,6 @@ struct thin_c { /*----------------------------------------------------------------*/ -/** - * __blkdev_issue_discard_async - queue a discard with async completion - * @bdev: blockdev to issue discard for - * @sector: start sector - * @nr_sects: number of sectors to discard - * @gfp_mask: memory allocation flags (for bio_alloc) - * @flags: BLKDEV_IFL_* flags to control behaviour - * @parent_bio: parent discard bio that all sub discards get chained to - * - * Description: - * Asynchronously issue a discard request for the sectors in question. - */ -static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sector, - sector_t nr_sects, gfp_t gfp_mask, unsigned long flags, - struct bio *parent_bio) -{ - struct request_queue *q = bdev_get_queue(bdev); - int type = REQ_WRITE | REQ_DISCARD; - struct bio *bio; - - if (!q || !nr_sects) - return -ENXIO; - - if (!blk_queue_discard(q)) - return -EOPNOTSUPP; - - if (flags & BLKDEV_DISCARD_SECURE) { - if (!blk_queue_secdiscard(q)) - return -EOPNOTSUPP; - type |= REQ_SECURE; - } - - /* - * Required bio_put occurs in bio_endio thanks to bio_chain below - */ - bio = bio_alloc(gfp_mask, 1); - if (!bio) - return -ENOMEM; - - bio_chain(bio, parent_bio); - - bio->bi_iter.bi_sector = sector; - bio->bi_bdev = bdev; - bio->bi_iter.bi_size = nr_sects << 9; - - submit_bio(type, bio); - - return 0; -} - static bool block_size_is_power_of_two(struct pool *pool) { return pool->sectors_per_block_shift >= 0; @@ -384,14 +334,55 @@ static sector_t block_to_sectors(struct pool *pool, dm_block_t b) (b * pool->sectors_per_block); } -static int issue_discard(struct thin_c *tc, dm_block_t data_b, dm_block_t data_e, - struct bio *parent_bio) +/*----------------------------------------------------------------*/ + +struct discard_op { + struct thin_c *tc; + struct blk_plug plug; + struct bio *parent_bio; + struct bio *bio; +}; + +static void begin_discard(struct discard_op *op, struct thin_c *tc, struct bio *parent) +{ + BUG_ON(!parent); + + op->tc = tc; + blk_start_plug(&op->plug); + op->parent_bio = parent; + op->bio = NULL; +} + +static int issue_discard(struct discard_op *op, dm_block_t data_b, dm_block_t data_e) { + struct thin_c *tc = op->tc; sector_t s = block_to_sectors(tc->pool, data_b); sector_t len = block_to_sectors(tc->pool, data_e - data_b); - return __blkdev_issue_discard_async(tc->pool_dev->bdev, s, len, - GFP_NOWAIT, 0, parent_bio); + return __blkdev_issue_discard(tc->pool_dev->bdev, s, len, + GFP_NOWAIT, REQ_WRITE | REQ_DISCARD, &op->bio); +} + +static void end_discard(struct discard_op *op, int r) +{ + if (op->bio) { + /* + * Even if one of the calls to issue_discard failed, we + * need to wait for the chain to complete. + */ + bio_chain(op->bio, op->parent_bio); + submit_bio(REQ_WRITE | REQ_DISCARD, op->bio); + } + + blk_finish_plug(&op->plug); + + /* + * Even if r is set, there could be sub discards in flight that we + * need to wait for. + */ + if (r && !op->parent_bio->bi_error) + op->parent_bio->bi_error = r; + bio_endio(op->parent_bio); } /*----------------------------------------------------------------*/ @@ -632,7 +623,7 @@ static void error_retry_list(struct pool *pool) { int error = get_pool_io_error_code(pool); - return error_retry_list_with_code(pool, error); + error_retry_list_with_code(pool, error); } /* @@ -1006,24 +997,28 @@ static void process_prepared_discard_no_passdown(struct dm_thin_new_mapping *m) mempool_free(m, tc->pool->mapping_pool); } -static int passdown_double_checking_shared_status(struct dm_thin_new_mapping *m) +/*----------------------------------------------------------------*/ + +static void passdown_double_checking_shared_status(struct dm_thin_new_mapping *m) { /* * We've already unmapped this range of blocks, but before we * passdown we have to check that these blocks are now unused. */ - int r; + int r = 0; bool used = true; struct thin_c *tc = m->tc; struct pool *pool = tc->pool; dm_block_t b = m->data_block, e, end = m->data_block + m->virt_end - m->virt_begin; + struct discard_op op; + begin_discard(&op, tc, m->bio); while (b != end) { /* find start of unmapped run */ for (; b < end; b++) { r = dm_pool_block_is_used(pool->pmd, b, &used); if (r) - return r; + goto out; if (!used) break; @@ -1036,20 +1031,20 @@ static int passdown_double_checking_shared_status(struct dm_thin_new_mapping *m) for (e = b + 1; e != end; e++) { r = dm_pool_block_is_used(pool->pmd, e, &used); if (r) - return r; + goto out; if (used) break; } - r = issue_discard(tc, b, e, m->bio); + r = issue_discard(&op, b, e); if (r) - return r; + goto out; b = e; } - - return 0; +out: + end_discard(&op, r); } static void process_prepared_discard_passdown(struct dm_thin_new_mapping *m) @@ -1059,20 +1054,21 @@ static void process_prepared_discard_passdown(struct dm_thin_new_mapping *m) struct pool *pool = tc->pool; r = dm_thin_remove_range(tc->td, m->virt_begin, m->virt_end); - if (r) + if (r) { metadata_operation_failed(pool, "dm_thin_remove_range", r); + bio_io_error(m->bio); - else if (m->maybe_shared) - r = passdown_double_checking_shared_status(m); - else - r = issue_discard(tc, m->data_block, m->data_block + (m->virt_end - m->virt_begin), m->bio); + } else if (m->maybe_shared) { + passdown_double_checking_shared_status(m); + + } else { + struct discard_op op; + begin_discard(&op, tc, m->bio); + r = issue_discard(&op, m->data_block, + m->data_block + (m->virt_end - m->virt_begin)); + end_discard(&op, r); + } - /* - * Even if r is set, there could be sub discards in flight that we - * need to wait for. - */ - m->bio->bi_error = r; - bio_endio(m->bio); cell_defer_no_holder(tc, m->cell); mempool_free(m, pool->mapping_pool); } @@ -1494,17 +1490,6 @@ static void process_discard_cell_no_passdown(struct thin_c *tc, pool->process_prepared_discard(m); } -/* - * __bio_inc_remaining() is used to defer parent bios's end_io until - * we _know_ all chained sub range discard bios have completed. - */ -static inline void __bio_inc_remaining(struct bio *bio) -{ - bio->bi_flags |= (1 << BIO_CHAIN); - smp_mb__before_atomic(); - atomic_inc(&bio->__bi_remaining); -} - static void break_up_discard_bio(struct thin_c *tc, dm_block_t begin, dm_block_t end, struct bio *bio) { @@ -1554,13 +1539,13 @@ static void break_up_discard_bio(struct thin_c *tc, dm_block_t begin, dm_block_t /* * The parent bio must not complete before sub discard bios are - * chained to it (see __blkdev_issue_discard_async's bio_chain)! + * chained to it (see end_discard's bio_chain)! * * This per-mapping bi_remaining increment is paired with * the implicit decrement that occurs via bio_endio() in - * process_prepared_discard_{passdown,no_passdown}. + * end_discard(). */ - __bio_inc_remaining(bio); + bio_inc_remaining(bio); if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) pool->process_prepared_discard(m); @@ -3899,7 +3884,7 @@ static struct target_type pool_target = { .name = "thin-pool", .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE | DM_TARGET_IMMUTABLE, - .version = {1, 18, 0}, + .version = {1, 19, 0}, .module = THIS_MODULE, .ctr = pool_ctr, .dtr = pool_dtr, @@ -4273,7 +4258,7 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits) static struct target_type thin_target = { .name = "thin", - .version = {1, 18, 0}, + .version = {1, 19, 0}, .module = THIS_MODULE, .ctr = thin_ctr, .dtr = thin_dtr, diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 3d3ac13..1b2f962 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -674,7 +674,7 @@ static void free_io(struct mapped_device *md, struct dm_io *io) mempool_free(io, md->io_pool); } -static void free_tio(struct mapped_device *md, struct dm_target_io *tio) +static void free_tio(struct dm_target_io *tio) { bio_put(&tio->clone); } @@ -1055,7 +1055,7 @@ static void clone_endio(struct bio *bio) !bdev_get_queue(bio->bi_bdev)->limits.max_write_same_sectors)) disable_write_same(md); - free_tio(md, tio); + free_tio(tio); dec_pending(io, error); } @@ -1517,7 +1517,6 @@ static void __map_bio(struct dm_target_io *tio) { int r; sector_t sector; - struct mapped_device *md; struct bio *clone = &tio->clone; struct dm_target *ti = tio->ti; @@ -1540,9 +1539,8 @@ static void __map_bio(struct dm_target_io *tio) generic_make_request(clone); } else if (r < 0 || r == DM_MAPIO_REQUEUE) { /* error the io and bail out, or requeue it if needed */ - md = tio->io->md; dec_pending(tio->io, r); - free_tio(md, tio); + free_tio(tio); } else if (r != DM_MAPIO_SUBMITTED) { DMWARN("unimplemented target map return value: %d", r); BUG(); @@ -1663,7 +1661,7 @@ static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, tio->len_ptr = len; r = clone_bio(tio, bio, sector, *len); if (r < 0) { - free_tio(ci->md, tio); + free_tio(tio); break; } __map_bio(tio); |