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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:08:49 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:08:49 +0200 |
| commit | c6132da1704be252ee6c923f47501083d835c238 (patch) | |
| tree | aa031c9091be1713e903be7ddc1ec8a03348d24f /drivers/scsi/scsi_lib.c | |
| parent | f565913ef8a8d0cfa46a1faaf8340cc357a46f3a (diff) | |
| download | lwn-c6132da1704be252ee6c923f47501083d835c238.tar.gz lwn-c6132da1704be252ee6c923f47501083d835c238.zip | |
scsi: convert to using sg helpers
This converts the SCSI mid layer to using the sg helpers for looking up
sg elements, instead of doing it manually.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 207f1aa08869..960f949b8f8f 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -17,6 +17,7 @@ #include <linux/pci.h> #include <linux/delay.h> #include <linux/hardirq.h> +#include <linux/scatterlist.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> @@ -289,14 +290,16 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl, struct request_queue *q = rq->q; int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned int data_len = bufflen, len, bytes, off; + struct scatterlist *sg; struct page *page; struct bio *bio = NULL; int i, err, nr_vecs = 0; - for (i = 0; i < nsegs; i++) { - page = sgl[i].page; - off = sgl[i].offset; - len = sgl[i].length; + for_each_sg(sgl, sg, nsegs, i) { + page = sg->page; + off = sg->offset; + len = sg->length; + data_len += len; while (len > 0 && data_len > 0) { /* @@ -2193,18 +2196,19 @@ EXPORT_SYMBOL_GPL(scsi_target_unblock); * * Returns virtual address of the start of the mapped page */ -void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, +void *scsi_kmap_atomic_sg(struct scatterlist *sgl, int sg_count, size_t *offset, size_t *len) { int i; size_t sg_len = 0, len_complete = 0; + struct scatterlist *sg; struct page *page; WARN_ON(!irqs_disabled()); - for (i = 0; i < sg_count; i++) { + for_each_sg(sgl, sg, sg_count, i) { len_complete = sg_len; /* Complete sg-entries */ - sg_len += sg[i].length; + sg_len += sg->length; if (sg_len > *offset) break; } @@ -2218,10 +2222,10 @@ void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, } /* Offset starting from the beginning of first page in this sg-entry */ - *offset = *offset - len_complete + sg[i].offset; + *offset = *offset - len_complete + sg->offset; /* Assumption: contiguous pages can be accessed as "page + i" */ - page = nth_page(sg[i].page, (*offset >> PAGE_SHIFT)); + page = nth_page(sg->page, (*offset >> PAGE_SHIFT)); *offset &= ~PAGE_MASK; /* Bytes in this sg-entry from *offset to the end of the page */ |