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[SCSI] block: fix the partial mappings with struct rq_map_data

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This fixes bio_copy_user_iov to properly handle the partial mappings
with struct rq_map_data (which only sg uses for now but st and osst
will shortly). It adds the offset member to struct rq_map_data and
changes blk_rq_map_user to update it so that bio_copy_user_iov can add
an appropriate page frame via bio_add_pc_page().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
FUJITA Tomonori 2008-12-18 14:49:37 +09:00 • committed by James Bottomley
commit 56c451f4b5
4 changed files with 14 additions and 3 deletions
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include/linux/blkdev.h
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@ -690,6 +690,7 @@ struct rq_map_data {
struct page **pages;
int page_order;
int nr_entries;
unsigned long offset;
};
struct req_iterator {