dm thin metadata: use pool locking at end of dm_pool_metadata_close

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commit 44d8ebf436 upstream.

Ensure that the pool is locked during calls to __commit_transaction and
__destroy_persistent_data_objects.  Just being consistent with locking,
but reality is dm_pool_metadata_close is called once pool is being
destroyed so access to pool shouldn't be contended.

Also, use pmd_write_lock_in_core rather than __pmd_write_lock in
dm_pool_commit_metadata and rename __pmd_write_lock to
pmd_write_lock_in_core -- there was no need for the alias.

In addition, verify that the pool is locked in __commit_transaction().

Fixes: 873f258bec ("dm thin metadata: do not write metadata if no changes occurred")
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mike Snitzer 2020-01-13 11:18:51 -05:00 • committed by Greg Kroah-Hartman

parent f371110c43

commit 1ebada600c

1 changed files with 6 additions and 4 deletions

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drivers/md/dm-thin-metadata.c

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