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>
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 207f1aa..960f949 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 @@
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 @@
*
* 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 @@
}
/* 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 */