path: root/block
diff options
authorTejun Heo <tj@kernel.org>2009-04-15 22:10:24 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-04-22 08:35:09 +0200
commit25636e282fe95508cae96bb27f86407aef935817 (patch)
tree3ab5b1ab589c02756211c8faa098f756488ff0de /block
parent23c560a99d78bddf5c251bfa97bce19e4da4b3f3 (diff)
block: fix SG_IO vector request data length handling
Impact: fix SG_IO behavior such that it matches the documentation SG_IO howto says that if ->dxfer_len and sum of iovec disagress, the shorter one wins. However, the current implementation returns -EINVAL for such cases. Trim iovc if it's longer than ->dxfer_len. This patch uses iov_*() helpers which take struct iovec * by casting struct sg_iovec * to it. sg_iovec is always identical to iovec and this will be further cleaned up with later patches. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
1 files changed, 12 insertions, 1 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 84b7f8709f4..82a0ca2f672 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -290,6 +290,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
if (hdr->iovec_count) {
const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
+ size_t iov_data_len;
struct sg_iovec *iov;
iov = kmalloc(size, GFP_KERNEL);
@@ -304,8 +305,18 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
goto out;
+ /* SG_IO howto says that the shorter of the two wins */
+ iov_data_len = iov_length((struct iovec *)iov,
+ hdr->iovec_count);
+ if (hdr->dxfer_len < iov_data_len) {
+ hdr->iovec_count = iov_shorten((struct iovec *)iov,
+ hdr->iovec_count,
+ hdr->dxfer_len);
+ iov_data_len = hdr->dxfer_len;
+ }
ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
- hdr->dxfer_len, GFP_KERNEL);
+ iov_data_len, GFP_KERNEL);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,