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path: root/drivers/block/scsi_ioctl.c
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Diffstat (limited to 'drivers/block/scsi_ioctl.c')
-rw-r--r--drivers/block/scsi_ioctl.c60
1 files changed, 36 insertions, 24 deletions
diff --git a/drivers/block/scsi_ioctl.c b/drivers/block/scsi_ioctl.c
index 681871ca5d6..abb2df249fd 100644
--- a/drivers/block/scsi_ioctl.c
+++ b/drivers/block/scsi_ioctl.c
@@ -216,7 +216,7 @@ static int sg_io(struct file *file, request_queue_t *q,
struct gendisk *bd_disk, struct sg_io_hdr *hdr)
{
unsigned long start_time;
- int reading, writing;
+ int writing = 0, ret = 0;
struct request *rq;
struct bio *bio;
char sense[SCSI_SENSE_BUFFERSIZE];
@@ -231,38 +231,48 @@ static int sg_io(struct file *file, request_queue_t *q,
if (verify_command(file, cmd))
return -EPERM;
- /*
- * we'll do that later
- */
- if (hdr->iovec_count)
- return -EOPNOTSUPP;
-
if (hdr->dxfer_len > (q->max_sectors << 9))
return -EIO;
- reading = writing = 0;
- if (hdr->dxfer_len) {
+ if (hdr->dxfer_len)
switch (hdr->dxfer_direction) {
default:
return -EINVAL;
case SG_DXFER_TO_FROM_DEV:
- reading = 1;
- /* fall through */
case SG_DXFER_TO_DEV:
writing = 1;
break;
case SG_DXFER_FROM_DEV:
- reading = 1;
break;
}
- rq = blk_rq_map_user(q, writing ? WRITE : READ, hdr->dxferp,
- hdr->dxfer_len);
+ rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
+ 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 (IS_ERR(rq))
- return PTR_ERR(rq);
- } else
- rq = blk_get_request(q, READ, __GFP_WAIT);
+ if (ret)
+ goto out;
/*
* fill in request structure
@@ -298,7 +308,7 @@ static int sg_io(struct file *file, request_queue_t *q,
* (if he doesn't check that is his problem).
* N.B. a non-zero SCSI status is _not_ necessarily an error.
*/
- blk_execute_rq(q, bd_disk, rq);
+ blk_execute_rq(q, bd_disk, rq, 0);
/* write to all output members */
hdr->status = 0xff & rq->errors;
@@ -320,12 +330,14 @@ static int sg_io(struct file *file, request_queue_t *q,
hdr->sb_len_wr = len;
}
- if (blk_rq_unmap_user(rq, bio, hdr->dxfer_len))
- return -EFAULT;
+ if (blk_rq_unmap_user(bio, hdr->dxfer_len))
+ ret = -EFAULT;
/* may not have succeeded, but output values written to control
* structure (struct sg_io_hdr). */
- return 0;
+out:
+ blk_put_request(rq);
+ return ret;
}
#define OMAX_SB_LEN 16 /* For backward compatibility */
@@ -408,7 +420,7 @@ static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
rq->data_len = bytes;
rq->flags |= REQ_BLOCK_PC;
- blk_execute_rq(q, bd_disk, rq);
+ blk_execute_rq(q, bd_disk, rq, 0);
err = rq->errors & 0xff; /* only 8 bit SCSI status */
if (err) {
if (rq->sense_len && rq->sense) {
@@ -561,7 +573,7 @@ int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd,
rq->cmd[0] = GPCMD_START_STOP_UNIT;
rq->cmd[4] = 0x02 + (close != 0);
rq->cmd_len = 6;
- err = blk_execute_rq(q, bd_disk, rq);
+ err = blk_execute_rq(q, bd_disk, rq, 0);
blk_put_request(rq);
break;
default: