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vhost/scsi: Move sanity check into vhost_scsi_map_iov_to_sgl

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Move the overflow check for sgl_count > TCM_VHOST_PREALLOC_SGLS into
vhost_scsi_map_iov_to_sgl() so that it's based on the total number
of SGLs for all IOVs, instead of single IOVs.

Also, rename TCM_VHOST_PREALLOC_PAGES -> TCM_VHOST_PREALLOC_UPAGES
to better describe pointers to user-space pages.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-02-22 18:34:08 -08:00
parent 1b49dcf3d7
commit 5a01d08217
1 changed files with 26 additions and 35 deletions
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61
drivers/vhost/scsi.c
View File

@ -57,7 +57,7 @@
#define TCM_VHOST_MAX_CDB_SIZE 32
#define TCM_VHOST_DEFAULT_TAGS 256
#define TCM_VHOST_PREALLOC_SGLS 2048
#define TCM_VHOST_PREALLOC_PAGES 2048
#define TCM_VHOST_PREALLOC_UPAGES 2048
struct vhost_scsi_inflight {
/* Wait for the flush operation to finish */
@ -767,34 +767,27 @@ vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *tv_cmd,
struct scatterlist *sgl,
unsigned int sgl_count,
struct iovec *iov,
int write)
struct page **pages,
bool write)
{
unsigned int npages = 0, pages_nr, offset, nbytes;
struct scatterlist *sg = sgl;
void __user *ptr = iov->iov_base;
size_t len = iov->iov_len;
struct page **pages;
int ret, i;
if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
pr_err("vhost_scsi_map_to_sgl() psgl_count: %u greater than"
" preallocated TCM_VHOST_PREALLOC_SGLS: %u\n",
sgl_count, TCM_VHOST_PREALLOC_SGLS);
return -ENOBUFS;
}
pages_nr = iov_num_pages(iov);
if (pages_nr > sgl_count)
return -ENOBUFS;
if (pages_nr > TCM_VHOST_PREALLOC_PAGES) {
if (pages_nr > sgl_count) {
pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
" preallocated TCM_VHOST_PREALLOC_PAGES: %u\n",
pages_nr, TCM_VHOST_PREALLOC_PAGES);
" 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",
pages_nr, TCM_VHOST_PREALLOC_UPAGES);
return -ENOBUFS;
}
pages = tv_cmd->tvc_upages;
ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
/* No pages were pinned */
@ -825,33 +818,32 @@ out:
static int
vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
struct iovec *iov,
unsigned int niov,
int write)
int niov,
bool write)
{
int ret;
unsigned int i;
u32 sgl_count;
struct scatterlist *sg;
struct scatterlist *sg = cmd->tvc_sgl;
unsigned int sgl_count = 0;
int ret, i;
/*
* Find out how long sglist needs to be
*/
sgl_count = 0;
for (i = 0; i < niov; i++)
sgl_count += iov_num_pages(&iov[i]);
/* TODO overflow checking */
if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than"
" preallocated TCM_VHOST_PREALLOC_SGLS: %u\n",
sgl_count, TCM_VHOST_PREALLOC_SGLS);
return -ENOBUFS;
}
sg = cmd->tvc_sgl;
pr_debug("%s sg %p sgl_count %u\n", __func__, sg, sgl_count);
sg_init_table(sg, sgl_count);
cmd->tvc_sgl_count = sgl_count;
pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
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],
write);
cmd->tvc_upages, write);
if (ret < 0) {
for (i = 0; i < cmd->tvc_sgl_count; i++)
put_page(sg_page(&cmd->tvc_sgl[i]));
@ -859,7 +851,6 @@ vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
cmd->tvc_sgl_count = 0;
return ret;
}
sg += ret;
sgl_count -= ret;
}
@ -1765,7 +1756,7 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg,
}
tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
TCM_VHOST_PREALLOC_PAGES, GFP_KERNEL);
TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL);
if (!tv_cmd->tvc_upages) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to allocate tv_cmd->tvc_upages\n");