btrfs: clean up our handling of refs == 0 in snapshot delete

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[ Upstream commit b8ccef0483 ]

In reada we BUG_ON(refs == 0), which could be unkind since we aren't
holding a lock on the extent leaf and thus could get a transient
incorrect answer.  In walk_down_proc we also BUG_ON(refs == 0), which
could happen if we have extent tree corruption.  Change that to return
-EUCLEAN.  In do_walk_down() we catch this case and handle it correctly,
however we return -EIO, which -EUCLEAN is a more appropriate error code.
Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert
that to proper error handling.  Also adjust the error message so we can
actually do something with the information.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Josef Bacik 2024-05-07 14:12:13 -04:00 • committed by Greg Kroah-Hartman

parent e7469c65b3

commit 7d1df13bf0

1 changed files with 23 additions and 5 deletions

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fs/btrfs/extent-tree.c

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