From mboxrd@z Thu Jan 1 00:00:00 1970 From: Asias He Subject: [PATCH v2 1/3] tcm_vhost: Introduce iov_num_pages Date: Tue, 22 Jan 2013 11:20:25 +0800 Message-ID: <1358824827-16169-2-git-send-email-asias@redhat.com> References: <1358824827-16169-1-git-send-email-asias@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1358824827-16169-1-git-send-email-asias@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Nicholas Bellinger Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" , virtualization@lists.linux-foundation.org, target-devel@vger.kernel.org List-Id: virtualization@lists.linuxfoundation.org Add a helper to calculate the number of pages needed for a iov entry. Signed-off-by: Asias He --- drivers/vhost/tcm_vhost.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c index 3720604..ca35c16 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 inline 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; -- 1.8.1