[PATCH v3] xfs: probe data buffer from page cache for unwritten extents

[Jie Liu]

On 07/10/2012 12:41 AM, Mark Tinguely wrote:
> On 07/03/12 02:15, Jeff Liu wrote:
>> Hello,
>>
>> This is v3 of the patch.
>>
>> We can trigger BUG() in xfs_seek_data() if met two unwritten without 
>> data or hole extents at last version.
>> So making the extents map reading in loop could solve it.
>>
>> Sorry, Am not yet try the repeated holes scenario according to Dave's 
>> comments as lack of X64 test env, still
>> waiting for it ready.  But this patch is already too long delayed, I 
>> have worked it out one weeks ago.
>> So I'd like to post it because of it could handle repeated 
>> hole/unwritten extents well in a loop, and I also improved
>> xfstests:286 with those cases for the verification, will post it soon.
>>
>> v2->v3:
>> Tested by Mark, hit BUG() for continuous unwritten extents without 
>> data wrote.
>> * xfs_seek_data(), remove BUG() and having extents map search in loop.
>>
>> v1->v2:
>> suggested by Mark.
>> * xfs_has_unwritten_buffer(), use the input offset instead of 
>> bmap->br_startoff to
>>   calculate page index for data buffer probing.
>>
>> Thanks,
>> -Jeff
>>
>>
>> Signed-off-by: Jie Liu<jeff.liu at oracle.com>
>>
>> ---
>
> Nice. Up to refining xfs_seek_hole()?
Thanks for the review.
Sorry for my late response, I missed you this email.
Sure, the refinement will be reflected in next post. :)

Thanks,
-Jeff
>
>
> Reviewed-by: Mark Tinguely <tinguely at sgi.com>
>
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