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rofiles-fuse: Support write/read_buf()

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These allow us to avoid copying a lot of data around
in userspace. Instead we splice the data directly from
the fd to the destination fd.

Closes: #684
Approved by: cgwalters
This commit is contained in:
Alexander Larsson 2017-02-14 14:36:28 +01:00 committed by Atomic Bot
parent ba350982e8
commit 4e908f867d
1 changed files with 35 additions and 0 deletions
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35
src/rofiles-fuse/main.c
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@ -344,6 +344,26 @@ callback_create(const char *path, mode_t mode, struct fuse_file_info *finfo)
return do_open (path, mode, finfo); return do_open (path, mode, finfo);
} }
static int
callback_read_buf (const char *path, struct fuse_bufvec **bufp,
size_t size, off_t offset, struct fuse_file_info *finfo)
{
struct fuse_bufvec *src;
src = malloc (sizeof (struct fuse_bufvec));
if (src == NULL)
return -ENOMEM;
*src = FUSE_BUFVEC_INIT (size);
src->buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
src->buf[0].fd = finfo->fh;
src->buf[0].pos = offset;
*bufp = src;
return 0;
}
static int static int
callback_read (const char *path, char *buf, size_t size, off_t offset, callback_read (const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *finfo) struct fuse_file_info *finfo)
@ -355,6 +375,19 @@ callback_read (const char *path, char *buf, size_t size, off_t offset,
return r; return r;
} }
static int
callback_write_buf (const char *path, struct fuse_bufvec *buf, off_t offset,
struct fuse_file_info *finfo)
{
struct fuse_bufvec dst = FUSE_BUFVEC_INIT (fuse_buf_size (buf));
dst.buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
dst.buf[0].fd = finfo->fh;
dst.buf[0].pos = offset;
return fuse_buf_copy (&dst, buf, FUSE_BUF_SPLICE_NONBLOCK);
}
static int static int
callback_write (const char *path, const char *buf, size_t size, off_t offset, callback_write (const char *path, const char *buf, size_t size, off_t offset,
struct fuse_file_info *finfo) struct fuse_file_info *finfo)
@ -454,7 +487,9 @@ struct fuse_operations callback_oper = {
.utime = callback_utime, .utime = callback_utime,
.create = callback_create, .create = callback_create,
.open = callback_open, .open = callback_open,
.read_buf = callback_read_buf,
.read = callback_read, .read = callback_read,
.write_buf = callback_write_buf,
.write = callback_write, .write = callback_write,
.statfs = callback_statfs, .statfs = callback_statfs,
.release = callback_release, .release = callback_release,