can't mount ubifs after resizing with ubirsvol

[Konstantin Tokarev]

19.11.2015, 16:44, "Richard Weinberger" <richard at nod.at>:
> Hi!
>
> Am 19.11.2015 um 14:34 schrieb Ibrahim Mattus Neto:
>>  Hi Richard!
>>
>>  Thanks for the response.
>>
>>  What I did was:
>>
>>  1) I created an .ubi file using the following configuration.
>>  [rootfs]
>>  mode=ubi
>>  vol_id=0
>>  vol_type=dynamic
>>  vol_name=rootfs
>>  vol_alignment=1
>>  image=rootfs.ubifs
>>  vol_size=80MiB
>>
>>  [data]
>>  mode=ubi
>>  vol_id=1
>>  vol_type=dynamic
>>  vol_name=data
>>  vol_alignment=1
>>  vol_flags=autoresize
>>  vol_size=10MiB
>>
>>  [recover]
>>  mode=ubi
>>  vol_id=2
>>  vol_type=dynamic
>>  vol_name=recover
>>  vol_alignment=1
>>  vol_size=5MiB
>>
>>  2) After booting I tried to shrink "data" and increase the size of recover using ubirsvol:
>>
>>  ubirsvol /dev/ubi0 -n 1 -s 4MiB (data)
>>
>>  ubirsvol /dev/ubi0 -n 2 -s 15MiB (recover)
>>
>>  3) After the resizing I tried to mount "data"
>>
>>  mount /home/data/
>>  [ 88.510000] UBIFS error (ubi0:1 pid 668): validate_sb: bad LEB count: 1159 in superblock, 34 on UBI volume, 20 minimum required
>>  [ 88.520000] UBIFS error (ubi0:1 pid 668): validate_sb: bad superblock, error 1
>
> This cannot work. You resized the UBI *volume*, not the UBIFS filesystem.
> And unless I'm very mistaken UBIFS does not support shrinking anyway.

I can confirm that shrinking UBIFS volume corrupts it.

-- 
Regards,
Konstantin