linux-kernel - Re: [PATCH] udf: Don't corrupt unalloc spacetable when writing it

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Date:	Thu, 09 Jul 2015 13:20:27 -0500
From:	Steve Magnani <steve.magnani@...idescorp.com>
To:	Jan Kara <jack@...e.cz>
CC:	linux-kernel@...r.kernel.org,
	"Steven J. Magnani" <steve@...idescorp.com>
Subject: Re: [PATCH] udf: Don't corrupt unalloc spacetable when writing it



On 07/09/2015 10:16 AM, Jan Kara wrote:
> On Tue 07-07-15 13:06:05, Steven J. Magnani wrote:
>> For a UDF filesystem configured with an Unallocated Space Table,
>> a filesystem operation that triggers an update to the table results
>> in on-disk corruption that prevents remounting:
>>
>>    udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 274
>>
>> For example:
>>    1. Create a filesystem
>>        $ mkudffs --media-type=hd --blocksize=512 --lvid=BUGTEST \
>>                --vid=BUGTEST --fsid=BUGTEST --space=unalloctable \
>>                /dev/mmcblk0
>>
>>    2. Mount it
>>        # mount /dev/mmcblk0 /mnt
>>
>> ...
> So the patch looks good to me. But what kind of mkudffs are you using?
> Because when I use the command you wrote into the changelog, I cannot mount
> the filesystem. The kernel complains about:
>
> UDF-fs: error (device ubdb): udf_read_inode: (ino 274) failed ident=256
> mount: /dev/ubdb: can't read superblock
>
> Now ident 256 is TAG_IDENT_FSD (file set descriptor). So apparently my
> mkudffs doesn't create proper partition table with your parameters...
>
>
It identifies itself as:
     mkudffs 1.0.0b2 for UDF FS 1.0.0-cvs, 2002/02/09

...from Ubuntu udftools 1.0.0b3-14.2.

------------------------------------------------------------------------
  Steven J. Magnani               "I claim this network for MARS!
  www.digidescorp.com              Earthling, return my space modulator!"

  #include <standard.disclaimer>

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