Lu Fengqi 905b3d18ae btrfs-progs: check/lowmem: Fix false alert of data extent backref lost for snapshot ... Btrfs lowmem check reports the following false alert: ------ ERROR: file extent[267 2162688] root 256 owner 5 backref lost ------ The file extent is in the leaf which is shared by file tree 256 and fs tree. ------ leaf 30605312 items 46 free space 4353 generation 7 owner 5 ...... item 45 key (267 EXTENT_DATA 2162688) itemoff 5503 itemsize 53 generation 7 type 2 (prealloc) prealloc data disk byte 13631488 nr 65536 prealloc data offset 32768 nr 32768 ------ And there is the corresponding extent_data_ref item in the extent tree. ------ item 1 key (13631488 EXTENT_DATA_REF 1007496934287921081) itemoff 15274 itemsize 28 extent data backref root 5 objectid 267 offset 2129920 count 1 ------ The offset of EXTENT_DATA_REF which is the hash of the owner root objectid, the inode number and the calculated offset (file offset - extent offset). What caused the false alert is the code mix up the owner root objectid and the file tree objectid. Fixes: b0d360b541 ("btrfs-progs: check: introduce function to check data backref in extent tree") Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>		2018-03-30 22:15:53 +02:00
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main.c	btrfs-progs: free-space-cache: Enhance free space cache free space check	2018-03-30 22:15:53 +02:00
mode-common.c	btrfs-progs: check: rename files after moving code	2018-02-02 16:01:59 +01:00
mode-common.h	btrfs-progs: check: rename files after moving code	2018-02-02 16:01:59 +01:00
mode-lowmem.c	btrfs-progs: check/lowmem: Fix false alert of data extent backref lost for snapshot	2018-03-30 22:15:53 +02:00
mode-lowmem.h	btrfs-progs: check: rename files after moving code	2018-02-02 16:01:59 +01:00
mode-original.h	btrfs-progs: check: rename files after moving code	2018-02-02 16:01:59 +01:00