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authorMike Christie <michaelc@cs.wisc.edu>2006-12-01 10:40:55 +0100
committerJens Axboe <jens.axboe@oracle.com>2006-12-01 10:40:55 +0100
commit0e75f9063f5c55fb0b0b546a7c356f8ec186825e (patch)
treedb138f641175403546c2147def4b405f3ff453a8 /block/scsi_ioctl.c
parentad2d7225709b11da47e092634cbdf0591829ae9c (diff)
downloadlinux-0e75f9063f5c55fb0b0b546a7c356f8ec186825e.tar.gz
[PATCH] block: support larger block pc requests
This patch modifies blk_rq_map/unmap_user() and the cdrom and scsi_ioctl.c users so that it supports requests larger than bio by chaining them together. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/scsi_ioctl.c')
-rw-r--r--block/scsi_ioctl.c53
1 files changed, 26 insertions, 27 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index e55a7562143..5493c2fbbab 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -226,7 +226,6 @@ static int sg_io(struct file *file, request_queue_t *q,
unsigned long start_time;
int writing = 0, ret = 0;
struct request *rq;
- struct bio *bio;
char sense[SCSI_SENSE_BUFFERSIZE];
unsigned char cmd[BLK_MAX_CDB];
@@ -258,30 +257,6 @@ static int sg_io(struct file *file, request_queue_t *q,
if (!rq)
return -ENOMEM;
- if (hdr->iovec_count) {
- const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
- struct sg_iovec *iov;
-
- iov = kmalloc(size, GFP_KERNEL);
- if (!iov) {
- ret = -ENOMEM;
- goto out;
- }
-
- if (copy_from_user(iov, hdr->dxferp, size)) {
- kfree(iov);
- ret = -EFAULT;
- goto out;
- }
-
- ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count);
- kfree(iov);
- } else if (hdr->dxfer_len)
- ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
-
- if (ret)
- goto out;
-
/*
* fill in request structure
*/
@@ -294,7 +269,6 @@ static int sg_io(struct file *file, request_queue_t *q,
rq->sense_len = 0;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
- bio = rq->bio;
/*
* bounce this after holding a reference to the original bio, it's
@@ -309,6 +283,31 @@ static int sg_io(struct file *file, request_queue_t *q,
if (!rq->timeout)
rq->timeout = BLK_DEFAULT_TIMEOUT;
+ if (hdr->iovec_count) {
+ const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
+ struct sg_iovec *iov;
+
+ iov = kmalloc(size, GFP_KERNEL);
+ if (!iov) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(iov, hdr->dxferp, size)) {
+ kfree(iov);
+ ret = -EFAULT;
+ goto out;
+ }
+
+ ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
+ hdr->dxfer_len);
+ kfree(iov);
+ } else if (hdr->dxfer_len)
+ ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
+
+ if (ret)
+ goto out;
+
rq->retries = 0;
start_time = jiffies;
@@ -339,7 +338,7 @@ static int sg_io(struct file *file, request_queue_t *q,
hdr->sb_len_wr = len;
}
- if (blk_rq_unmap_user(bio, hdr->dxfer_len))
+ if (blk_rq_unmap_user(rq))
ret = -EFAULT;
/* may not have succeeded, but output values written to control