Re: [PATCH] block: loop: fix filesystem corruption in case of aio/dio

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On 04/15/2016 04:51 AM, Ming Lei wrote:
Starting from commit e36f620428(block: split bios to max possible length),
block core starts to split bio in the middle of bvec.

Unfortunately loop dio/aio doesn't consider this situation, and
always treat 'iter.iov_offset' as zero. Then filesystem corruption
is observed.

This patch figures out the offset of the base bvevc via
'bio->bi_iter.bi_bvec_done' and fixes the issue by passing the offset
to iov iterator.

Fixes: e36f6204288088f (block: split bios to max possible length)
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx (4.5)
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>

Thanks Ming, queued up.

--
Jens Axboe

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