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3 stable fixes and 1 fix for a regression introduced during 3.19 merge: 

- Fix inability to discard used space when the thin-pool target is in
   out-of-data-space mode and also transition the thin-pool back to write
   mode once free space is made available.
 
 - Fix DM core bio-based end_io bug that prevented proper post-processing
   of the error code returned from the block layer.
 
 - Fix crash in DM thin-pool due to thin device being added to the pool's
   active_thins list before properly initializing the thin device's
   refcount.
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Merge tag 'dm-3.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:
 "Thre stable fixes and one fix for a regression introduced during 3.19
  merge:

   - Fix inability to discard used space when the thin-pool target is in
     out-of-data-space mode and also transition the thin-pool back to
     write mode once free space is made available.

   - Fix DM core bio-based end_io bug that prevented proper
     post-processing of the error code returned from the block layer.

   - Fix crash in DM thin-pool due to thin device being added to the
     pool's active_thins list before properly initializing the thin
     device's refcount"

* tag 'dm-3.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: fix missed error code if .end_io isn't implemented by target_type
  dm thin: fix crash by initializing thin device's refcount and completion earlier
  dm thin: fix missing out-of-data-space to write mode transition if blocks are released
  dm thin: fix inability to discard blocks when in out-of-data-space mode
hifive-unleashed-5.1
Linus Torvalds 2014-12-22 14:47:17 -08:00
parent 48ec833b78 5164bece16
commit aa39477b56
2 changed files with 24 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/md/dm-thin.c
View File

@ -1127,6 +1127,24 @@ static void schedule_external_copy(struct thin_c *tc, dm_block_t virt_block,
schedule_zero(tc, virt_block, data_dest, cell, bio);
}
static void set_pool_mode(struct pool *pool, enum pool_mode new_mode);
static void check_for_space(struct pool *pool)
{
int r;
dm_block_t nr_free;
if (get_pool_mode(pool) != PM_OUT_OF_DATA_SPACE)
return;
r = dm_pool_get_free_block_count(pool->pmd, &nr_free);
if (r)
return;
if (nr_free)
set_pool_mode(pool, PM_WRITE);
}
/*
* A non-zero return indicates read_only or fail_io mode.
* Many callers don't care about the return value.
@ -1141,6 +1159,8 @@ static int commit(struct pool *pool)
r = dm_pool_commit_metadata(pool->pmd);
if (r)
metadata_operation_failed(pool, "dm_pool_commit_metadata", r);
else
check_for_space(pool);
return r;
}
@ -1159,8 +1179,6 @@ static void check_low_water_mark(struct pool *pool, dm_block_t free_blocks)
}
}
static void set_pool_mode(struct pool *pool, enum pool_mode new_mode);
static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
{
int r;
@ -2155,7 +2173,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
pool->process_cell = process_cell_read_only;
pool->process_discard_cell = process_discard_cell;
pool->process_prepared_mapping = process_prepared_mapping;
pool->process_prepared_discard = process_prepared_discard_passdown;
pool->process_prepared_discard = process_prepared_discard;
if (!pool->pf.error_if_no_space && no_space_timeout)
queue_delayed_work(pool->wq, &pool->no_space_timeout, no_space_timeout);
@ -3814,6 +3832,8 @@ static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv)
r = -EINVAL;
goto bad;
}
atomic_set(&tc->refcount, 1);
init_completion(&tc->can_destroy);
list_add_tail_rcu(&tc->list, &tc->pool->active_thins);
spin_unlock_irqrestore(&tc->pool->lock, flags);
/*
@ -3826,9 +3846,6 @@ static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv)
dm_put(pool_md);
atomic_set(&tc->refcount, 1);
init_completion(&tc->can_destroy);
return 0;
bad:

2
drivers/md/dm.c
View File

@ -899,7 +899,7 @@ static void disable_write_same(struct mapped_device *md)
static void clone_endio(struct bio *bio, int error)
{
int r = 0;
int r = error;
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
struct dm_io *io = tio->io;
struct mapped_device *md = tio->io->md;