scsi_debug: support sg chaining
Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 4947dfe..72ee4c9 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -38,6 +38,7 @@
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/moduleparam.h>
+#include <linux/scatterlist.h>
#include <linux/blkdev.h>
#include "scsi.h"
@@ -600,7 +601,7 @@
int k, req_len, act_len, len, active;
void * kaddr;
void * kaddr_off;
- struct scatterlist * sgpnt;
+ struct scatterlist * sg;
if (0 == scp->request_bufflen)
return 0;
@@ -619,16 +620,16 @@
scp->resid = req_len - act_len;
return 0;
}
- sgpnt = (struct scatterlist *)scp->request_buffer;
active = 1;
- for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) {
+ req_len = act_len = 0;
+ scsi_for_each_sg(scp, sg, scp->use_sg, k) {
if (active) {
kaddr = (unsigned char *)
- kmap_atomic(sgpnt->page, KM_USER0);
+ kmap_atomic(sg->page, KM_USER0);
if (NULL == kaddr)
return (DID_ERROR << 16);
- kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
- len = sgpnt->length;
+ kaddr_off = (unsigned char *)kaddr + sg->offset;
+ len = sg->length;
if ((req_len + len) > arr_len) {
active = 0;
len = arr_len - req_len;
@@ -637,7 +638,7 @@
kunmap_atomic(kaddr, KM_USER0);
act_len += len;
}
- req_len += sgpnt->length;
+ req_len += sg->length;
}
if (scp->resid)
scp->resid -= act_len;
@@ -653,7 +654,7 @@
int k, req_len, len, fin;
void * kaddr;
void * kaddr_off;
- struct scatterlist * sgpnt;
+ struct scatterlist * sg;
if (0 == scp->request_bufflen)
return 0;
@@ -668,13 +669,14 @@
memcpy(arr, scp->request_buffer, len);
return len;
}
- sgpnt = (struct scatterlist *)scp->request_buffer;
- for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) {
- kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0);
+ sg = scsi_sglist(scp);
+ req_len = fin = 0;
+ for (k = 0; k < scp->use_sg; ++k, sg = sg_next(sg)) {
+ kaddr = (unsigned char *)kmap_atomic(sg->page, KM_USER0);
if (NULL == kaddr)
return -1;
- kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
- len = sgpnt->length;
+ kaddr_off = (unsigned char *)kaddr + sg->offset;
+ len = sg->length;
if ((req_len + len) > max_arr_len) {
len = max_arr_len - req_len;
fin = 1;
@@ -683,7 +685,7 @@
kunmap_atomic(kaddr, KM_USER0);
if (fin)
return req_len + len;
- req_len += sgpnt->length;
+ req_len += sg->length;
}
return req_len;
}