From: Qu Wenruo <wqu@xxxxxxxx> commit b0b595e61d97de61c15b379b754b2caa90e83e5c upstream. [BUG] There are some reports about invalid data backref objectids, the report looks like this: BTRFS critical (device sda): corrupt leaf: block=333654787489792 slot=110 extent bytenr=333413935558656 len=65536 invalid data ref objectid value 2543 The data ref objectid is the inode number inside the subvolume. But in above case, the value is completely sane, not really showing the problem. [CAUSE] The root cause of the problem is the deprecated feature, inode cache. This feature results a special inode number, -12ULL, and it's no longer recognized by tree-checker, triggering the error. The direct problem here is the output of data ref objectid. The value shown is in fact the dref_root (subvolume id), not the dref_objectid (inode number). [FIX] Fix the output to use dref_objectid instead. Reported-by: Neil Parton <njparton@xxxxxxxxx> Reported-by: Archange <archange@xxxxxxxxxxxxx> Link: https://lore.kernel.org/linux-btrfs/CAAYHqBbrrgmh6UmW3ANbysJX9qG9Pbg3ZwnKsV=5mOpv_qix_Q@xxxxxxxxxxxxxx/ Link: https://lore.kernel.org/linux-btrfs/9541deea-9056-406e-be16-a996b549614d@xxxxxxxxxxxxx/ Fixes: f333a3c7e832 ("btrfs: tree-checker: validate dref root and objectid") CC: stable@xxxxxxxxxxxxxxx # 6.11 Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/btrfs/tree-checker.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/btrfs/tree-checker.c +++ b/fs/btrfs/tree-checker.c @@ -1499,7 +1499,7 @@ static int check_extent_item(struct exte dref_objectid > BTRFS_LAST_FREE_OBJECTID)) { extent_err(leaf, slot, "invalid data ref objectid value %llu", - dref_root); + dref_objectid); return -EUCLEAN; } if (unlikely(!IS_ALIGNED(dref_offset, Patches currently in stable-queue which might be from wqu@xxxxxxxx are queue-6.10/btrfs-always-update-fstrim_range-on-failure-in-fitrim-ioctl.patch queue-6.10/btrfs-subpage-fix-the-bitmap-dump-which-can-cause-bitmap-corruption.patch queue-6.10/btrfs-tree-checker-fix-the-wrong-output-of-data-backref-objectid.patch
