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Date: Mon, 16 Jul 2007 11:47:33 +0200
From: Jens Axboe <jens.axboe@...cle.com>
To: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Cc: Jens Axboe <jens.axboe@...cle.com>, dgilbert@...erlog.com
Subject: [PATCH 19/33] scsi_debug: support sg chaining
Cc: dgilbert@...erlog.com
Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
drivers/scsi/scsi_debug.c | 30 ++++++++++++++++--------------
1 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 4cd9c58..46a3e07 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 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
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 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
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 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
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 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
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 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
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 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
kunmap_atomic(kaddr, KM_USER0);
if (fin)
return req_len + len;
- req_len += sgpnt->length;
+ req_len += sg->length;
}
return req_len;
}
--
1.5.3.rc0.90.gbaa79
-
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