Re: invalid files names, btrfs check can't repair it

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2018年01月15日 00:38, Sebastian Andrzej Siewior wrote:
> On 2018-01-14 08:36:41 [+0800], Qu Wenruo wrote:
>> Still needs more. (and maybe even more depending on the output)
>>
>> The original mode doesn't report error clear enough, so it would help if
>> --mode=lowmem can be used.
>>
>> # btrfs check --mode=lowmem /dev/sdb4
> 
> ~# btrfs check --mode=lowmem /dev/sdb4
> Checking filesystem on /dev/sdb4
> UUID: b3bfb56e-d445-4335-93f0-c1fb2d1f6df1
> checking extents
> checking free space cache
> Wanted bytes 4096, found 8192 for off 159178047488
> Wanted bytes 1073725440, found 8192 for off 159178047488
> cache appears valid but isn't 159178031104
> ERROR: errors found in free space cache

A new bug is exposed for lowmem mode.
It doesn't check fs tree if space cache has any problem.

> found 63691210752 bytes used, error(s) found
> total csum bytes: 61339388
> total tree bytes: 860540928
> total fs tree bytes: 688816128
> total extent tree bytes: 84549632
> btree space waste bytes: 224428280
> file data blocks allocated: 62890483712
>  referenced 62828957696
> 
>> And the tree dump of the affected dir inode would help too:
>>
>> # btrfs inspect dump-tree /dev/sdb4 | grep -C 20 \(57648595
> 
> ~# btrfs inspect dump-tree /dev/sdb4 | grep -C 20 \(57648595
>                 generation 88831 type 1 (regular)
>                 extent data disk byte 193705541632 nr 134217728
>                 extent data offset 0 nr 134217728 ram 134217728
>                 extent compression 0 (none)
>         item 4 key (57022249 EXTENT_DATA 402653184) itemoff 3769 itemsize 53
>                 generation 88831 type 1 (regular)
>                 extent data disk byte 190035439616 nr 60600320
>                 extent data offset 0 nr 60600320 ram 60600320
>                 extent compression 0 (none)
>         item 5 key (57643659 INODE_ITEM 0) itemoff 3609 itemsize 160
>                 generation 89044 transid 89423 size 2 nbytes 0
>                 block group 0 mode 40755 links 1 uid 1000 gid 1000 rdev 0
>                 sequence 0 flags 0x150be(none)
>                 atime 1513266994.264310920 (2017-12-14 16:56:34)
>                 ctime 1513868332.369178014 (2017-12-21 15:58:52)
>                 mtime 1513868332.369178014 (2017-12-21 15:58:52)
>                 otime 1513266994.264310920 (2017-12-14 16:56:34)
>         item 6 key (57643659 INODE_REF 58477961) itemoff 3598 itemsize 11
>                 index 6 namelen 1 name: 4
>         item 7 key (57643659 DIR_ITEM 4189400016) itemoff 3567 itemsize 31
>                 location key (57648595 INODE_ITEM 0) type DIR
>                 transid 89045 data_len 0 name_len 1
>                 name: d
>         item 8 key (57643659 DIR_INDEX 113) itemoff 3536 itemsize 31
>                 location key (57648595 INODE_ITEM 0) type DIR
>                 transid 89045 data_len 0 name_len 1
>                 name: d
>         item 9 key (57643872 INODE_ITEM 0) itemoff 3376 itemsize 160
>                 generation 89044 transid 89699 size 0 nbytes 0
>                 block group 0 mode 40755 links 1 uid 1000 gid 1000 rdev 0
>                 sequence 0 flags 0x603b3(none)
>                 atime 1513266995.540343055 (2017-12-14 16:56:35)
>                 ctime 1515602448.66422211 (2018-01-10 17:40:48)
>                 mtime 1515602448.66422211 (2018-01-10 17:40:48)
>                 otime 1513266995.540343055 (2017-12-14 16:56:35)
>         item 10 key (57643872 INODE_REF 682) itemoff 3363 itemsize 13
>                 index 58 namelen 3 name: tmp
>         item 11 key (57648595 INODE_ITEM 0) itemoff 3203 itemsize 160
>                 generation 89045 transid 89423 size 8350 nbytes 0
>                 block group 0 mode 40755 links 1 uid 1000 gid 1000 rdev 0
>                 sequence 0 flags 0xc90(none)
>                 atime 1513267009.164686143 (2017-12-14 16:56:49)
>                 ctime 1513868329.753150507 (2017-12-21 15:58:49)
>                 mtime 1513868329.753150507 (2017-12-21 15:58:49)
>                 otime 1513267009.164686143 (2017-12-14 16:56:49)
>         item 12 key (57648595 INODE_REF 57643659) itemoff 3192 itemsize 11
>                 index 113 namelen 1 name: d
>         item 13 key (57648595 DIR_ITEM 3331247447) itemoff 3123 itemsize 69
>                 location key (58472210 INODE_ITEM 0) type FILE
>                 transid 89418 data_len 0 name_len 8231
>                 name: 454bf066ddfbf42e0f3b77ea71c82f-878732.oq
>         item 14 key (57648595 DIR_ITEM 3363354030) itemoff 3053 itemsize 70
>                 location key (57923894 INODE_ITEM 0) type DIR_ITEM.33
>                 transid 89142 data_len 0 name_len 40
>                 name: 2f3f379b2a3d7499471edb74869efe-1948311.d
>         item 15 key (57648595 DIR_INDEX 435) itemoff 2983 itemsize 70
>                 location key (57923894 INODE_ITEM 0) type FILE

Please run the following command too:

# btrfs inspect dump-tree <device> | grep -C20 \(57923894

>                 transid 89142 data_len 0 name_len 40
>                 name: 2f3f379b2a3d7499471edb74869efe-1948311.d
>         item 16 key (57648595 DIR_INDEX 1137) itemoff 2914 itemsize 69
>                 location key (58472210 INODE_ITEM 0) type FILE

And this command too:

# btrfs inspect dump-tree <device> | grep -C20 \(58472210

Thanks,
Qu

>                 transid 89418 data_len 0 name_len 39
>                 name: 454bf066ddfbf42e0f3b77ea71c82f-878732.o
>         item 17 key (57923894 INODE_ITEM 0) itemoff 2754 itemsize 160
>                 generation 89142 transid 89142 size 36092 nbytes 36864
>                 block group 0 mode 100644 links 1 uid 1000 gid 1000 rdev 0
>                 sequence 0 flags 0x91(none)
>                 atime 1513278413.460486168 (2017-12-14 20:06:53)
>                 ctime 1513278413.460486168 (2017-12-14 20:06:53)
>                 mtime 1513278413.460486168 (2017-12-14 20:06:53)
>                 otime 1513278413.460486168 (2017-12-14 20:06:53)
>         item 18 key (57923894 INODE_REF 57648595) itemoff 2704 itemsize 50
>                 index 435 namelen 40 name: 2f3f379b2a3d7499471edb74869efe-1948311.d
>         item 19 key (57923894 EXTENT_DATA 0) itemoff 2651 itemsize 53
>                 generation 89142 type 1 (regular)
>                 extent data disk byte 123290755072 nr 36864
>                 extent data offset 0 nr 36864 ram 36864
>                 extent compression 0 (none)
>         item 20 key (58191388 INODE_ITEM 0) itemoff 2491 itemsize 160
>                 generation 89259 transid 89259 size 395280 nbytes 397312
>> Thanks,
>> Qu
> 
> Sebastian
> 


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