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btrfs: reset block group chunk force if we have to wait

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[ Upstream commit 1314ca78b2 ]

If you try to force a chunk allocation, but you race with another chunk
allocation, you will end up waiting on the chunk allocation that just
occurred and then allocate another chunk.  If you have many threads all
doing this at once you can way over-allocate chunks.

Fix this by resetting force to NO_FORCE, that way if we think we need to
allocate we can, otherwise we don't force another chunk allocation if
one is already happening.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
CC: stable@vger.kernel.org # 5.4+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josef Bacik 2022-06-13 18:31:17 -04:00 committed by Greg Kroah-Hartman
parent b367f125c8
commit b5c5417586
1 changed files with 1 additions and 0 deletions
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fs/btrfs/block-group.c
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@ -3632,6 +3632,7 @@ int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
* attempt.
*/
wait_for_alloc = true;
force = CHUNK_ALLOC_NO_FORCE;
spin_unlock(&space_info->lock);
mutex_lock(&fs_info->chunk_mutex);
mutex_unlock(&fs_info->chunk_mutex);