[BUG] UBIFS corruption on powerpc 32-bit targets

[Tomas Alvarez Vanoli]

Hi,

>It would be appreciate that if you could modify according to the
>suggestions and resend them.

I'll take look at the patch and submit the changes soon.

>Looks like that there is only one problem, the inode cannot be found but
>the dentry(ne_config.xml.gz) still exists on flash. I guess the lost
>inode is 3917759 in previous log.
>Maybe the inode is
>
>UBIFS error (ubi1:0 pid 134): ubifs_iget: failed to read inode 3917759,
>error -2
>UBIFS error (ubi1:0 pid 134): ubifs_lookup: dead directory entry
>'ne_config.xml.gz', error -2
>UBIFS warning (ubi1:0 pid 134): ubifs_ro_mode: switched to read-only
>mode, error -2
>find: /cfg/board/cfg/mob/backup/ne/ne_config.xml.gz: No such fiCPU: 1
>UID: 0 PID: 134 Comm: find Not tainted 6.12.57-00435-gf9e139970f1f #0
>
>Apply following patch to kernel and mount bad ubifs image, let's try to
>find more information after a full volume scanning:

I flashed again the corrupted image, the same error happens with "find /cfg",
but also I get a couple ecc errors afterwards for some reason.

Here's some excerpts related to ino 3917759 from the full volume scan

```
---------- Start scan LEB 911 (main_first 11) ----------
data 3917705 found 0 0-3792
padding bytes 3792:4096
data 3917705 found 0 4096-4408
padding bytes 4408:6144
data 3917707 found 0 6144-6608
padding bytes 6608:8192
data 3917708 found 0 8192-8360
padding bytes 8360:10240
data 3917709 found 0 10240-10824
padding bytes 10824:12288
data 3917710 found 0 12288-12752
padding bytes 12752:14336
data 3917711 found 0 14336-14816
padding bytes 14816:16384
data 3917712 found 0 16384-17192
padding bytes 17192:18432
data 3917714 found 0 18432-19496
padding bytes 19496:20480
data 3917715 found 0 20480-20648
padding bytes 20648:22528
data 3917716 found 0 22528-23000
padding bytes 23000:24576
data 3917717 found 0 24576-25056
padding bytes 25056:26624
data 3917718 found 0 26624-27112
padding bytes 27112:28672
data 3917719 found 0 28672-30768
padding bytes 30768:32768
data 3917721 found 0 32768-32936
padding bytes 32936:34816
data 3917722 found 0 34816-35288
padding bytes 35288:36864
data 3917723 found 0 36864-37344
padding bytes 37344:38912
data 3917724 found 0 38912-39400
padding bytes 39400:40960
data 3917725 found 0 40960-42024
padding bytes 42024:43008
data 3917726 found 0 43008-45144
padding bytes 45144:47104
data 3917728 found 0 47104-48200
padding bytes 48200:49152
data 3917729 found 0 49152-49632
padding bytes 49632:51200
data 3917731 found 0 51200-51368
padding bytes 51368:53248
data 3917732 found 0 53248-54336
padding bytes 54336:55296
data 3917733 found 0 55296-55784
padding bytes 55784:57344
data 3917734 found 0 57344-57840
padding bytes 57840:59392
data 3917735 found 0 59392-59552
padding bytes 59552:61440
data 3917736 found 0 61440-61920
padding bytes 61920:63488
data 3917738 found 0 63488-63968
padding bytes 63968:65536
data 3917739 found 0 65536-66680
padding bytes 66680:67584
data 3917740 found 0 67584-67752
padding bytes 67752:69632
data 3917741 found 0 69632-70112
padding bytes 70112:71680
data 3917742 found 0 71680-72176
padding bytes 72176:73728
data 3917743 found 0 73728-74136
padding bytes 74136:75776
data 3917745 found 0 75776-75944
padding bytes 75944:77824
data 3917746 found 0 77824-78888
padding bytes 78888:79872
data 3917747 found 0 79872-80328
padding bytes 80328:81920
data 3917748 found 0 81920-82384
padding bytes 82384:83968
data 3917749 found 0 83968-84440
padding bytes 84440:86016
data 3917750 found 0 86016-86728
padding bytes 86728:88064
data 3917698 found 0 88064-88264
padding bytes 88264:90112
data 3917753 found 1 90112-90592
padding bytes 90592:92160
data 3917755 found 1 92160-92640
padding bytes 92640:94208
data 3917756 found 1 94208-94688
padding bytes 94688:96256
data 3917757 found 1 96256-96744
padding bytes 96744:98304
data 3917758 found 1 98304-98792
padding bytes 98792:100352
data 3917759 found 0 100352-101792
padding bytes 101792:102400
data 3917760 found 1 102400-103464
padding bytes 103464:104448
data 3917762 found 1 104448-104824
padding bytes 104824:106496
data 3917763 found 1 106496-106664
padding bytes 106664:108544
data 3917761 found 1 108544-112688
padding bytes 112688:114688
data 3917761 found 1 114688-117768
padding bytes 117768:118784
data 3917767 found 1 118784-120224
padding bytes 120224:120832
data 3917768 found 1 120832-121320
padding bytes 121320:122880
data 3917769 found 1 122880-123360
padding bytes 123360:124928
ino 69 found 0 124928-125088
padding bytes 125088:126976
---------- Start scan LEB 912 (main_first 11) ----------
```

[...]

```
---------- Start scan LEB 914 (main_first 11) ----------
ino 3917758 found 0 0-160
padding bytes 160:2048
dent 13819078852795695104(ne_config.xml.gz) found 1 2048-2128
ino 3917759 found 0 2128-2288
ino 3917754 found 0 2288-2448
padding bytes 2448:4096
ino 3917758 found 1 4096-4256
padding bytes 4256:6144
ino 3917759 found 0 6144-6304
padding bytes 6304:8192
```

There's also a second dent found in the tree for ne_config.xml.gz (there's
another file named the same elsewhere), probably irrelevant:

```
padding bytes 29056:30720
dent 14323482011061190656(ne) found 1 30720-30784
ino 3917766 found 0 30784-30944
ino 3917765 found 0 30944-31104
padding bytes 31104:32768
dent 14395539605099118592(ne_config.xml.gz) found 1 32768-32848
ino 3917767 found 0 32848-33008
ino 3917766 found 0 33008-33168
padding bytes 33168:34816
ino 3917767 found 0 34816-34976
padding bytes 34976:36864
```

The full logs are roughly 120 thousand lines, let me know if you need me to
search for something or would like them filtered differently.

Best Regards,
Tomas