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| author | Tejun Heo <htejun@gmail.com> | 2008-02-19 11:35:38 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-02-19 11:35:38 +0100 |
| commit | 40b01b9bbdf51ae543a04744283bf2d56c4a6afa (patch) | |
| tree | 0f81015c01834b97fdb5646a63c3fe1a24936d81 /block/blk-merge.c | |
| parent | libata: update ATAPI overflow draining (diff) | |
| download | linux-40b01b9bbdf51ae543a04744283bf2d56c4a6afa.tar.xz linux-40b01b9bbdf51ae543a04744283bf2d56c4a6afa.zip | |
block: update bio according to DMA alignment padding
DMA start address and transfer size alignment for PC requests are
achieved using bio_copy_user() instead of bio_map_user(). This works
because bio_copy_user() always uses full pages and block DMA alignment
isn't allowed to go over PAGE_SIZE.
However, the implementation didn't update the last bio of the request
to make this padding visible to lower layers. This patch makes
blk_rq_map_user() extend the last bio such that it includes the
padding area and the size of area pointed to by the request is
properly aligned.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-merge.c')
0 files changed, 0 insertions, 0 deletions