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block: restore the meaning of rq->data_len to the true data length

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The meaning of rq->data_len was changed to the length of an allocated
buffer from the true data length. It breaks SG_IO friends and
bsg. This patch restores the meaning of rq->data_len to the true data
length and adds rq->extra_len to store an extended length (due to
drain buffer and padding).

This patch also removes the code to update bio in blk_rq_map_user
introduced by the commit 40b01b9bbd.
The commit adjusts bio according to memory alignment
(queue_dma_alignment). However, memory alignment is NOT padding
alignment. This adjustment also breaks SG_IO friends and bsg. Padding
alignment needs to be fixed in a proper way (by a separate patch).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>
This commit is contained in:
FUJITA Tomonori 2008-03-04 11:17:11 +01:00 • committed by Jens Axboe
parent 89b6e74378
commit 7a85f8896f
7 changed files with 13 additions and 18 deletions
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2
include/linux/blkdev.h
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@ -216,8 +216,8 @@ struct request {
unsigned int cmd_len;
unsigned char cmd[BLK_MAX_CDB];
unsigned int raw_data_len;
unsigned int data_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;
void *data;
void *sense;