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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-07-16 12:19:24 +0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 13:14:18 +0400 |
| commit | 852e034de7727f91dd51995c460a04db2955f1b3 (patch) | |
| tree | 89d7152009dcec589a2bd2995eef29f8f3263f17 /drivers/scsi/scsi_debug.c | |
| parent | 8726021626780a73e795c9b939e1ee49ac8c9136 (diff) | |
| download | linux-852e034de7727f91dd51995c460a04db2955f1b3.tar.xz | |
scsi_debug: support sg chaining
Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
| -rw-r--r-- | 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 4947dfe625a6..72ee4c9cfb1a 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; } |