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authorNicholas Bellinger <nab@linux-iscsi.org>2015-01-28 13:10:51 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2015-02-04 10:55:36 -0800
commitb4078b5face3c1e79ef6e2dd254af04a470ed2bc (patch)
tree55692e7ced0d180fd202c2c03f740a68d69d68f3 /drivers
parentde1419e42088e99f8f839710c42aec759e45de77 (diff)
vhost/scsi: Change vhost_scsi_map_to_sgl to accept iov ptr + len
This patch changes vhost_scsi_map_to_sgl() parameters to accept virtio iovec ptr + len when determing pages_nr. This is currently done with iov_num_pages() -> PAGE_ALIGN, so allow the same parameters as well. Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/vhost/scsi.c37
1 files changed, 15 insertions, 22 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 62de820ae2f4..b9800c7a1d5d 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -222,10 +222,10 @@ static struct workqueue_struct *tcm_vhost_workqueue;
static DEFINE_MUTEX(tcm_vhost_mutex);
static LIST_HEAD(tcm_vhost_list);
-static int iov_num_pages(struct iovec *iov)
+static int iov_num_pages(void __user *iov_base, size_t iov_len)
{
- return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
- ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
+ return (PAGE_ALIGN((unsigned long)iov_base + iov_len) -
+ ((unsigned long)iov_base & PAGE_MASK)) >> PAGE_SHIFT;
}
static void tcm_vhost_done_inflight(struct kref *kref)
@@ -782,25 +782,18 @@ vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct tcm_vhost_tpg *tpg,
* Returns the number of scatterlist entries used or -errno on error.
*/
static int
-vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *tv_cmd,
+vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *cmd,
+ void __user *ptr,
+ size_t len,
struct scatterlist *sgl,
- unsigned int sgl_count,
- struct iovec *iov,
- struct page **pages,
bool write)
{
- unsigned int npages = 0, pages_nr, offset, nbytes;
+ unsigned int npages = 0, offset, nbytes;
+ unsigned int pages_nr = iov_num_pages(ptr, len);
struct scatterlist *sg = sgl;
- void __user *ptr = iov->iov_base;
- size_t len = iov->iov_len;
+ struct page **pages = cmd->tvc_upages;
int ret, i;
- pages_nr = iov_num_pages(iov);
- if (pages_nr > sgl_count) {
- pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
- " sgl_count: %u\n", pages_nr, sgl_count);
- return -ENOBUFS;
- }
if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) {
pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
" preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n",
@@ -845,7 +838,7 @@ vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
int ret, i;
for (i = 0; i < niov; i++)
- sgl_count += iov_num_pages(&iov[i]);
+ sgl_count += iov_num_pages(iov[i].iov_base, iov[i].iov_len);
if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than"
@@ -861,8 +854,8 @@ vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
pr_debug("Mapping iovec %p for %u pages\n", &iov[0], sgl_count);
for (i = 0; i < niov; i++) {
- ret = vhost_scsi_map_to_sgl(cmd, sg, sgl_count, &iov[i],
- cmd->tvc_upages, write);
+ ret = vhost_scsi_map_to_sgl(cmd, iov[i].iov_base, iov[i].iov_len,
+ sg, write);
if (ret < 0) {
for (i = 0; i < cmd->tvc_sgl_count; i++) {
struct page *page = sg_page(&cmd->tvc_sgl[i]);
@@ -889,7 +882,7 @@ vhost_scsi_map_iov_to_prot(struct tcm_vhost_cmd *cmd,
int ret, i;
for (i = 0; i < niov; i++)
- prot_sgl_count += iov_num_pages(&iov[i]);
+ prot_sgl_count += iov_num_pages(iov[i].iov_base, iov[i].iov_len);
if (prot_sgl_count > TCM_VHOST_PREALLOC_PROT_SGLS) {
pr_err("vhost_scsi_map_iov_to_prot() sgl_count: %u greater than"
@@ -904,8 +897,8 @@ vhost_scsi_map_iov_to_prot(struct tcm_vhost_cmd *cmd,
cmd->tvc_prot_sgl_count = prot_sgl_count;
for (i = 0; i < niov; i++) {
- ret = vhost_scsi_map_to_sgl(cmd, prot_sg, prot_sgl_count, &iov[i],
- cmd->tvc_upages, write);
+ ret = vhost_scsi_map_to_sgl(cmd, iov[i].iov_base, iov[i].iov_len,
+ prot_sg, write);
if (ret < 0) {
for (i = 0; i < cmd->tvc_prot_sgl_count; i++) {
struct page *page = sg_page(&cmd->tvc_prot_sgl[i]);