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[PATCH v2 100/109] virtiofsd: add definition of fuse_buf_writev()
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PATCH v2 100/109] virtiofsd: add definition of fuse_buf_writev() |
Date: |
Tue, 21 Jan 2020 12:24:24 +0000 |
From: piaojun <address@hidden>
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 <address@hidden>
Suggested-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Daniel P. Berrangé <address@hidden>
---
tools/virtiofsd/buffer.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
index 918e0f41e0..70980550d2 100644
--- a/tools/virtiofsd/buffer.c
+++ b/tools/virtiofsd/buffer.c
@@ -13,6 +13,7 @@
#include "fuse_lowlevel.h"
#include <assert.h>
#include <errno.h>
+#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@@ -32,6 +33,43 @@ 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;
--
2.24.1
- [PATCH v2 091/109] virtiofsd: rename inode->refcount to inode->nlookup, (continued)
- [PATCH v2 091/109] virtiofsd: rename inode->refcount to inode->nlookup, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 092/109] libvhost-user: Fix some memtable remap cases, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 093/109] virtiofsd: add man page, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 094/109] virtiofsd: passthrough_ll: fix refcounting on remove/rename, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 095/109] virtiofsd: introduce inode refcount to prevent use-after-free, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 096/109] virtiofsd: do not always set FUSE_FLOCK_LOCKS, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 098/109] virtiofsd: Reset O_DIRECT flag during file open, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 097/109] virtiofsd: convert more fprintf and perror to use fuse log infra, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 100/109] virtiofsd: add definition of fuse_buf_writev(),
Dr. David Alan Gilbert (git) <=
- [PATCH v2 099/109] virtiofsd: Fix data corruption with O_APPEND write in writeback mode, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 101/109] virtiofsd: use fuse_buf_writev to replace fuse_buf_write for better performance, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 102/109] virtiofsd: process requests in a thread pool, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 103/109] virtiofsd: prevent FUSE_INIT/FUSE_DESTROY races, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 104/109] virtiofsd: fix lo_destroy() resource leaks, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 105/109] virtiofsd: add --thread-pool-size=NUM option, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 106/109] virtiofsd: Convert lo_destroy to take the lo->mutex lock itself, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 107/109] virtiofsd/passthrough_ll: Pass errno to fuse_reply_err(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 108/109] virtiofsd: stop all queue threads on exit in virtio_loop(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 109/109] virtiofsd: add some options to the help message, Dr. David Alan Gilbert (git), 2020/01/21