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scsi_debug: support sg chaining 

Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-07-16 10:19:24 +02:00
parent 8726021626
commit 852e034de7
1 changed files with 16 additions and 14 deletions
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30
drivers/scsi/scsi_debug.c
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@ -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;
}