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

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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>
This commit is contained in:
Filipe Manana 2024-11-15 15:46:13 +00:00 committed by David Sterba
parent b188ad7791
commit ed67f2a913
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent-tree.c
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@ -2422,7 +2422,7 @@ int btrfs_cross_ref_exist(struct btrfs_root *root, u64 objectid, u64 offset,
goto out;
ret = check_delayed_ref(root, path, objectid, offset, bytenr);
} while (ret == -EAGAIN);
} while (ret == -EAGAIN && !path->nowait);
out:
btrfs_release_path(path);