From: Asias He <asias@redhat.com>
To: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: target-devel@vger.kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: [PATCH 1/3] tcm_vhost: Introduce iov_num_pages
Date: Mon, 21 Jan 2013 16:05:26 +0800 [thread overview]
Message-ID: <1358755528-31421-2-git-send-email-asias@redhat.com> (raw)
In-Reply-To: <1358755528-31421-1-git-send-email-asias@redhat.com>
Add a helper to calculate the number of pages needed for a iov entry.
Signed-off-by: Asias He <asias@redhat.com>
---
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
next prev parent reply other threads:[~2013-01-21 8:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-21 8:05 [PATCH 0/3] tcm_vhost: Optimize gup in vhost_scsi_map_to_sgl Asias He
2013-01-21 8:05 ` Asias He [this message]
2013-01-21 8:05 ` [PATCH 2/3] " Asias He
2013-01-21 18:57 ` Marcelo Tosatti
2013-01-22 1:33 ` Asias He
2013-01-21 18:57 ` Marcelo Tosatti
2013-01-21 8:05 ` Asias He
2013-01-21 8:05 ` [PATCH 3/3] tcm_vhost: Use iov_num_pages to calculate sgl_count Asias He
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1358755528-31421-2-git-send-email-asias@redhat.com \
--to=asias@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=mst@redhat.com \
--cc=nab@linux-iscsi.org \
--cc=target-devel@vger.kernel.org \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.