94 lines
2.7 KiB
Diff
94 lines
2.7 KiB
Diff
|
From e4c8fd1060fb69a093064851ebf66dd82533ec0e Mon Sep 17 00:00:00 2001
|
||
|
|
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
||
|
|
Date: Mon, 27 Jan 2020 19:02:17 +0100
|
||
|
|
Subject: [PATCH 106/116] virtiofsd: add definition of fuse_buf_writev()
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
||
|
|
Message-id: <20200127190227.40942-103-dgilbert@redhat.com>
|
||
|
|
Patchwork-id: 93557
|
||
|
|
O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 102/112] virtiofsd: add definition of fuse_buf_writev()
|
||
|
|
Bugzilla: 1694164
|
||
|
|
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
||
|
|
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
||
|
|
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
|
||
|
|
|
||
|
|
From: piaojun <piaojun@huawei.com>
|
||
|
|
|
||
|
|
Define fuse_buf_writev() which use pwritev and writev to improve io
|
||
|
|
bandwidth. Especially, the src bufs with 0 size should be skipped as
|
||
|
|
their mems are not *block_size* aligned which will cause writev failed
|
||
|
|
in direct io mode.
|
||
|
|
|
||
|
|
Signed-off-by: Jun Piao <piaojun@huawei.com>
|
||
|
|
Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
|
||
|
|
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
||
|
|
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
||
|
|
(cherry picked from commit 9ceaaa15cf21073c2b23058c374f61c30cd39c31)
|
||
|
|
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||
|
|
---
|
||
|
|
tools/virtiofsd/buffer.c | 38 ++++++++++++++++++++++++++++++++++++++
|
||
|
|
1 file changed, 38 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
|
||
|
|
index 42a608f..37befeb 100644
|
||
|
|
--- a/tools/virtiofsd/buffer.c
|
||
|
|
+++ b/tools/virtiofsd/buffer.c
|
||
|
|
@@ -14,6 +14,7 @@
|
||
|
|
#include "fuse_lowlevel.h"
|
||
|
|
#include <assert.h>
|
||
|
|
#include <errno.h>
|
||
|
|
+#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
@@ -33,6 +34,43 @@ size_t fuse_buf_size(const struct fuse_bufvec *bufv)
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
+__attribute__((unused))
|
||
|
|
+static ssize_t fuse_buf_writev(struct fuse_buf *out_buf,
|
||
|
|
+ struct fuse_bufvec *in_buf)
|
||
|
|
+{
|
||
|
|
+ ssize_t res, i, j;
|
||
|
|
+ size_t iovcnt = in_buf->count;
|
||
|
|
+ struct iovec *iov;
|
||
|
|
+ int fd = out_buf->fd;
|
||
|
|
+
|
||
|
|
+ iov = calloc(iovcnt, sizeof(struct iovec));
|
||
|
|
+ if (!iov) {
|
||
|
|
+ return -ENOMEM;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ for (i = 0, j = 0; i < iovcnt; i++) {
|
||
|
|
+ /* Skip the buf with 0 size */
|
||
|
|
+ if (in_buf->buf[i].size) {
|
||
|
|
+ iov[j].iov_base = in_buf->buf[i].mem;
|
||
|
|
+ iov[j].iov_len = in_buf->buf[i].size;
|
||
|
|
+ j++;
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ if (out_buf->flags & FUSE_BUF_FD_SEEK) {
|
||
|
|
+ res = pwritev(fd, iov, iovcnt, out_buf->pos);
|
||
|
|
+ } else {
|
||
|
|
+ res = writev(fd, iov, iovcnt);
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ if (res == -1) {
|
||
|
|
+ res = -errno;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ free(iov);
|
||
|
|
+ return res;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static size_t min_size(size_t s1, size_t s2)
|
||
|
|
{
|
||
|
|
return s1 < s2 ? s1 : s2;
|
||
|
|
--
|
||
|
|
1.8.3.1
|
||
|
|
|