btrfs: don't loop for nowait writes when checking for cross references

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[ Upstream commit ed67f2a913 ]

When checking for delayed refs when verifying if there are cross
references for a data extent, we stop if the path has nowait set and we
can't try lock the delayed ref head's mutex, returning -EAGAIN with the
goal of making a write fallback to a blocking context. However we ignore
the -EAGAIN at btrfs_cross_ref_exist() when check_delayed_ref() returns
it, and keep looping instead of immediately returning the -EAGAIN to the
caller.

Fix this by not looping if we get -EAGAIN and we have a nowait path.

Fixes: 26ce911446 ("btrfs: make can_nocow_extent nowait compatible")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Filipe Manana 2024-11-15 15:46:13 +00:00 • committed by Greg Kroah-Hartman

parent bcacb52a98

commit 99f3cd5a86

1 changed files with 1 additions and 1 deletions

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fs/btrfs/extent-tree.c

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