block: hide request sector and data_len

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Block low level drivers for some reason have been pretty good at
abusing block layer API.  Especially struct request's fields tend to
get violated in all possible ways.  Make it clear that low level
drivers MUST NOT access or manipulate rq->sector and rq->data_len
directly by prefixing them with double underscores.

This change is also necessary to break build of out-of-tree codes
which assume the previous block API where internal fields can be
manipulated and rq->data_len carries residual count on completion.

[ Impact: hide internal fields, block API change ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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Tejun Heo 2009-05-07 22:24:44 +09:00 • committed by Jens Axboe

parent 34b7d2c957

commit a2dec7b363

4 changed files with 17 additions and 16 deletions

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include/linux/blkdev.h

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