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authorAsias He <asias@redhat.com>2013-01-22 11:20:25 +0800
committerNicholas Bellinger <nab@linux-iscsi.org>2013-02-13 11:27:40 -0800
commit765b34fdc1507add8fd6f1007410e7a375d0f89c (patch)
treeba101d2224da2b56121e39b6fde67b5979ec2d11 /drivers/vhost
parent9d6064a347a8e15451cbdf6286542d402c9da24c (diff)
tcm_vhost: Introduce iov_num_pages
Add a helper to calculate the number of pages needed for a iov entry. (nab: Drop unnecessary inline) Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/tcm_vhost.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 77d760bb2e44..defc28595656 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -77,6 +77,12 @@ 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)
+{
+ return (PAGE_ALIGN((unsigned long)iov->iov_base + iov->iov_len) -
+ ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
+}
+
static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
{
return 1;