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btrfs-progs: lowmem check: Fix false alert about referencer count mismatch

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The normal back reference counting doesn't care about the extent referred
by the extent data in the shared leaf. The check_extent_data_backref
function need to skip the leaf that owner mismatch with the root_id.

Reported-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Lu Fengqi 2017-11-03 16:28:05 +08:00 committed by David Sterba
parent faaf70f1cc
commit 29379da543
1 changed files with 2 additions and 1 deletions
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cmds-check.c
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@ -12468,7 +12468,8 @@ static int check_extent_data_backref(struct btrfs_fs_info *fs_info,
leaf = path.nodes[0];
slot = path.slots[0];
if (slot >= btrfs_header_nritems(leaf))
if (slot >= btrfs_header_nritems(leaf) ||
btrfs_header_owner(leaf) != root_id)
goto next;
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)