[U-Boot] Unreadable UBIFS partition after power cuts

[Anton Habegger]

Hello Heiko

>Am 14.01.2015 13:52, schrieb Anton Habegger:
>> Hello
>>
>> We have a PPC MPC5125 device with 64MB NOR flash. The U-boot has to load the kernel and initramfs from a UBIFS partition.
>> Recently we made an upgrade from U-Boot version V2010.12 to version V2014.10. Now after some regression tests with power cuts, we got an UBIFS state, which is unreadable for U-Boot  version  V2014.10. If I do a tftpboot an mount the UBIFS with linux, there is no problem. It is also very >>strange, that if I downgrade the U-Boot to V2010.12, then it is also no problem with the partition and everything is readable. I tend to say there is probably a regression with the most recent U-Boot version. But I don't know where I can start to find it. I enabled also the DEBUG define, but there >>appears no additional debug message concerning UBIFS. How can I debug this?

>You can enable:

>#undef CONFIG_UBI_SILENCE_MSG
>#define CONFIG_MTD_DEBUG
>#define CONFIG_MTD_DEBUG_VERBOSE 1

Now I got output, thank you. I have to investigate more to get a better picture.

>With which Linux version do you test? U-Boot is synced with linux 3.15 ... so, if you can test it with a kernel >= 3.15 this would be great!

Our device is running with 2.6.34, with the patches from git://git.infradead.org/users/dedekind/ubifs-v2.6.34.git. I'm also able to open mount the image with linux 3.13  (Ubuntu 14.04/x86_64) and the mtdram module.
As soon the image is once mounted (and recovered) either with 2.6.34 or 3.13, the U-Boot V2014.10 can load it as well.

Here the dmesg output mount with linux 3.13 which succeeds:
[189672.868677] UBI: attaching mtd0 to ubi0
[189672.869154] UBI: scanning is finished
[189672.870359] UBI: attached mtd0 (name "mtdram test device", size 63 MiB) to ubi0
[189672.870363] UBI: PEB size: 131072 bytes (128 KiB), LEB size: 130944 bytes
[189672.870366] UBI: min./max. I/O unit sizes: 1/64, sub-page size 1
[189672.870367] UBI: VID header offset: 64 (aligned 64), data offset: 128
[189672.870369] UBI: good PEBs: 504, bad PEBs: 0, corrupted PEBs: 0
[189672.870371] UBI: user volume: 1, internal volumes: 1, max. volumes count: 128
[189672.870373] UBI: max/mean erase counter: 280/161, WL threshold: 4096, image sequence number: 2041090957
[189672.870374] UBI: available PEBs: 0, total reserved PEBs: 504, PEBs reserved for bad PEB handling: 0
[189672.870489] UBI: background thread "ubi_bgt0d" started, PID 50742
[189689.698048] UBIFS: background thread "ubifs_bgt0_0" started, PID 50750
[189689.698157] UBIFS: recovery needed
[189689.699949] UBIFS: recovery completed
[189689.700308] UBIFS: mounted UBI device 0, volume 0, name "flash"
[189689.700313] UBIFS: LEB size: 130944 bytes (127 KiB), min./max. I/O unit sizes: 8 bytes/64 bytes
[189689.700316] UBIFS: FS size: 61674624 bytes (58 MiB, 471 LEBs), journal size 8249472 bytes (7 MiB, 63 LEBs)
[189689.700318] UBIFS: reserved for root: 0 bytes (0 KiB)
[189689.700321] UBIFS: media format: w4/r0 (latest is w4/r0), UUID 370BF56B-8A90-443C-B344-BF6BA00A8634, small LPT model

>> Here the output from U-Boot V2014.10:
>>
>> => ubi part fs
>> UBI: attaching mtd1 to ubi0
>> UBI: scanning is finished
>> UBI: attached mtd1 (name "mtd=0", size 63 MiB) to ubi0
>> UBI: PEB size: 131072 bytes (128 KiB), LEB size: 130944 bytes
>> UBI: min./max. I/O unit sizes: 1/64, sub-page size 1
>> UBI: VID header offset: 64 (aligned 64), data offset: 128
>> UBI: good PEBs: 504, bad PEBs: 0, corrupted PEBs: 0
>> UBI: user volume: 1, internal volumes: 1, max. volumes count: 128
>> UBI: max/mean erase counter: 280/161, WL threshold: 4096, image 
>> sequence number: 2041090957
>> UBI: available PEBs: 0, total reserved PEBs: 504, PEBs reserved for 
>> bad PEB handling: 0 => ubifsmount ubi:flash => ubifsls
>> 	    53549  Mon Dec 01 11:34:08 2014  setup.xml
>> 	     2051  Wed Nov 19 09:05:49 2014  LOG_Default_000001.csv
>> 	filldir: Error in ubifs_iget(), ino=44049 ret=ffffffea!

>seems a problem in ubifs_iget() fs/ubifs/super.c ... it returns -EINVAL please debug into this function for a starting point.

Thank you for the hint. I will start from there.

Anton
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