[PATCH 1/5] metadump: sanitise write_buf/index return values

[Mark Tinguely]

On 02/13/14 20:20, Dave Chinner wrote:
> On Thu, Feb 13, 2014 at 01:30:00PM -0600, Mark Tinguely wrote:
>> On 01/23/14 04:23, Dave Chinner wrote:
>>> From: Dave Chinner<dchinner at redhat.com>
>>>
>>> Write_buf/write_index use confusing boolean values for return,
>>> meaning that it's hard to tell what the correct error return is
>>> supposed to be.  Convert them to return zero on success or a
>>> negative errno otherwise so that it's clear what the error case is.
>>>
>>> Signed-off-by: Dave Chinner<dchinner at redhat.com>
>>> ---
>>
>> Looks like this patch broke metadumps on some corrupted filesystems.
>> This is a legacy filesystem that has zeroes overwriting the
>> SB/AGF/AGI on AG 1/2/3:
>>
>>
>> # xfs_metadump -wgo /dev/sda8 myfile.metadata
>> xfs_agf_read_verify: XFS_CORRUPTION_ERROR
>> xfs_metadump: cannot init perag data (117). Continuing anyway.
>> Copied 64 of 64 inodes (0 of 4 AGs) xfs_agf_write_verify: XF
>> S_CORRUPTION_ERROR
>> write_buf: write verifer failed on bno 0x1100919/0x200
>> (no output)
>
> Where did it crash? Can you post the stack trace from gdb? Even
> better, can you send a patch to fix the problem? ;)
>
> Cheers,
>
> Dave.

No crash, just exits without performing the dump.

--Mark.