btrfs: fix unnecessary transaction commit fallback from btrfs_log_all_parents()

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When btrfs_log_all_parents() returns without doing any work (because all
parent directories were already logged), it returns 1, which is propagated
up the fsync call chain up to btrfs_log_dentry_safe(), and that causes
btrfs_sync_file() to trigger am unnecessary transaction commit.

This all happens because the call to btrfs_search_slot() in
btrfs_log_all_parents() always returns 1, as there can not be any inode
ref keys with an offset 0 (an invalid inode number), so if the while loop
below it does not do any work because all parent directories were already
logged, the 'ret' variable remains with a value of 1, which is then
returned up the call chain to btrfs_sync_file().

Fix this by setting 'ret' to 0 after the call to btrfs_search_slot().

Fixes: 0f24ea456a ("btrfs: tracepoints: add trace event for btrfs_log_all_parents()")
Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Filipe Manana 2026-09-03 13:15:46 +01:00 • committed by David Sterba

parent 776924b2d9

commit 36f9aafa46

1 changed files with 16 additions and 0 deletions

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fs/btrfs/tree-log.c

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