mount ubi volume fails: No such device

[Lars Michael <lh_post@yahoo.com>]

> On Mon, 2011-02-07 at 07:05 -0800, Lars Michael wrote:
> > UBI: scrubbed PEB 863, data moved to PEB 1097 UBI warning:
> ubi_eba_copy_leb: read data back from PEB 1092 and it is different UBI
> error: wear_leveling_worker: error -22 while moving PEB 868 to PEB 1092
> UBI warning: ubi_ro_mode: switch to read-only mode UBI error: do_work:
> work failed with error code -22 UBI error: ubi_thread: ubi_bgt0d: work
> failed with error code -22
> 
> It says you that it wrote some date, then read it back, compared, and
> the data did not match. You need to start with validating your falash
> drivers - use mtd tests:
> 
> http://www.linux-mtd.infradead.org/doc/general.html#L_mtd_tests
> 

I formatted and wrote the image again. ubiattach _sometimes_ completes without the error code -22. In this case the mount went ok. But mount sometimes fails completely (structure needs cleaning), other times errors are reported but successfully recovered. So it seems to work, but no in
a reliable way. Any suggestions on how to improve it? My kernel is 2.6.29 so perhaps some patches are needed?

For example:

[root@M54418TWR /]# mount -t ubifs ubi0:rootfs /mnt/ubi_rootfs
UBIFS error (pid 661): ubifs_scan: garbage
UBIFS error (pid 661): ubifs_scanned_corruption: corrupted data at LEB 2:8192
UBIFS error (pid 661): ubifs_scanned_corruption: first 4096 bytes from LEB 2:8192
UBIFS error (pid 661): ubifs_scan: LEB 2 scanning failed
UBIFS error (pid 661): ubifs_scan: corrupt empty space at LEB 5:69632
UBIFS error (pid 661): ubifs_scanned_corruption: corrupted data at LEB 5:69632
UBIFS error (pid 661): ubifs_scanned_corruption: first 4096 bytes from LEB 5:69632
UBIFS error (pid 661): ubifs_scan: LEB 5 scanning failed
mount: mounting ubi0:rootfs on /mnt/ubi_rootfs failed: Structure needs cleaning

or:

mount -t ubifs ubi0:datafs /mnt/udatafs
UBIFS error (pid 670): ubifs_scan: garbage
UBIFS error (pid 670): ubifs_scanned_corruption: corrupted data at LEB 2:4096
UBIFS error (pid 670): ubifs_scanned_corruption: first 4096 bytes from LEB 2:4096
UBIFS error (pid 670): ubifs_scan: LEB 2 scanning failed
UBIFS: recovery needed
UBIFS error (pid 670): ubifs_scan: garbage
UBIFS error (pid 670): ubifs_scanned_corruption: corrupted data at LEB 4:0
UBIFS error (pid 670): ubifs_scanned_corruption: first 4096 bytes from LEB 4:0
UBIFS error (pid 670): ubifs_scan: LEB 4 scanning failed
UBIFS: recovery completed
UBIFS: mounted UBI device 0, volume 2, name "datafs"
UBIFS: file system size:   4952064 bytes (4836 KiB, 4 MiB, 39 LEBs)
UBIFS: journal size:       1142785 bytes (1116 KiB, 1 MiB, 9 LEBs)
UBIFS: media format:       4 (latest is 4)
UBIFS: default compressor: lzo
UBIFS: reserved for root:  0 bytes (0 KiB)

Regards,
- Lars