[PATCH 4.16 091/272] Btrfs: fix copy_items() return value when logging an inode

Greg Kroah-Hartman
2018-05-28T11:08:24Z

From: Filipe Manana <fdmanana@suse.com>

[ Upstream commit 8434ec46c6e3232cebc25a910363b29f5c617820 ]

When logging an inode, at tree-log.c:copy_items(), if we call
btrfs_next_leaf() at the loop which checks for the need to log holes, we
need to make sure copy_items() returns the value 1 to its caller and
not 0 (on success). This is because the path the caller passed was
released and is now different from what is was before, and the caller
expects a return value of 0 to mean both success and that the path
has not changed, while a return value of 1 means both success and
signals the caller that it can not reuse the path, it has to perform
another tree search.

Even though this is a case that should not be triggered on normal
circumstances or very rare at least, its consequences can be very
unpredictable (especially when replaying a log tree).

Fixes: 16e7549f045d ("Btrfs: incompatible format change to remove hole extents")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/tree-log.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -4005,6 +4005,7 @@ fill_holes:
ASSERT(ret == 0);
src = src_path->nodes[0];
i = 0;
+ need_find_last_extent = true;
}

btrfs_item_key_to_cpu(src, &key, i);