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vhost/scsi: Change vhost_scsi_map_to_sgl to accept iov ptr + len

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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>
This commit is contained in:
Nicholas Bellinger 2015-01-28 13:10:51 -08:00
parent de1419e420
commit b4078b5fac
1 changed files with 15 additions and 22 deletions
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37
drivers/vhost/scsi.c
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@ -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]);