path: root/block/blk-merge.c
diff options
authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-03-04 11:17:11 +0100
committerJens Axboe <axboe@carl.home.kernel.dk>2008-03-04 11:17:11 +0100
commit7a85f8896f4b4a4a0249563b92af9e3161a6b467 (patch)
tree616c62e3c96237e874fc0f47133fbca2160913b5 /block/blk-merge.c
parent89b6e743788516491846724d7ef89bcac7ac9c99 (diff)
block: restore the meaning of rq->data_len to the true data length
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 40b01b9bbdf51ae543a04744283bf2d56c4a6afa. 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>
Diffstat (limited to 'block/blk-merge.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 7506c4fe0264..0f58616bcd7f 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -231,7 +231,7 @@ new_segment:
((unsigned long)q->dma_drain_buffer) &
(PAGE_SIZE - 1));
- rq->data_len += q->dma_drain_size;
+ rq->extra_len += q->dma_drain_size;
if (sg)