diff options
| -rw-r--r-- | drivers/md/dm.c | 37 |
1 files changed, 16 insertions, 21 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ae21833b270a..f5703727d974 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -102,7 +102,6 @@ union map_info *dm_get_mapinfo(struct bio *bio) struct mapped_device { struct rw_semaphore io_lock; struct mutex suspend_lock; - spinlock_t pushback_lock; rwlock_t map_lock; atomic_t holders; atomic_t open_count; @@ -122,7 +121,7 @@ struct mapped_device { wait_queue_head_t wait; struct work_struct work; struct bio_list deferred; - struct bio_list pushback; + spinlock_t deferred_lock; /* * Processing queue (flush/barriers) @@ -445,7 +444,9 @@ static int queue_io(struct mapped_device *md, struct bio *bio) return 1; } + spin_lock_irq(&md->deferred_lock); bio_list_add(&md->deferred, bio); + spin_unlock_irq(&md->deferred_lock); up_write(&md->io_lock); return 0; /* deferred successfully */ @@ -529,16 +530,14 @@ static void dec_pending(struct dm_io *io, int error) if (io->error == DM_ENDIO_REQUEUE) { /* * Target requested pushing back the I/O. - * This must be handled before the sleeper on - * suspend queue merges the pushback list. */ - spin_lock_irqsave(&md->pushback_lock, flags); + spin_lock_irqsave(&md->deferred_lock, flags); if (__noflush_suspending(md)) - bio_list_add(&md->pushback, io->bio); + bio_list_add(&md->deferred, io->bio); else /* noflush suspend was interrupted. */ io->error = -EIO; - spin_unlock_irqrestore(&md->pushback_lock, flags); + spin_unlock_irqrestore(&md->deferred_lock, flags); } end_io_acct(io); @@ -1096,7 +1095,7 @@ static struct mapped_device *alloc_dev(int minor) init_rwsem(&md->io_lock); mutex_init(&md->suspend_lock); - spin_lock_init(&md->pushback_lock); + spin_lock_init(&md->deferred_lock); rwlock_init(&md->map_lock); atomic_set(&md->holders, 1); atomic_set(&md->open_count, 0); @@ -1410,25 +1409,21 @@ static void dm_wq_work(struct work_struct *work) down_write(&md->io_lock); - while ((c = bio_list_pop(&md->deferred))) +next_bio: + spin_lock_irq(&md->deferred_lock); + c = bio_list_pop(&md->deferred); + spin_unlock_irq(&md->deferred_lock); + + if (c) { __split_and_process_bio(md, c); + goto next_bio; + } clear_bit(DMF_BLOCK_IO, &md->flags); up_write(&md->io_lock); } -static void __merge_pushback_list(struct mapped_device *md) -{ - unsigned long flags; - - spin_lock_irqsave(&md->pushback_lock, flags); - clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); - bio_list_merge_head(&md->deferred, &md->pushback); - bio_list_init(&md->pushback); - spin_unlock_irqrestore(&md->pushback_lock, flags); -} - static void dm_queue_flush(struct mapped_device *md) { queue_work(md->wq, &md->work); @@ -1572,7 +1567,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) remove_wait_queue(&md->wait, &wait); if (noflush) - __merge_pushback_list(md); + clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); up_write(&md->io_lock); /* were we interrupted ? */ |