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fuse: add helper for asynchronous writes

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This patch adds a new helper function fuse_write_fill() which makes it
possible to send WRITE requests asynchronously.

A new flag for WRITE requests is also added which indicates that this a write
from the page cache, and not a "normal" file write.

This patch is in preparation for writable mmap support.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2007-10-18 03:07:03 -07:00 committed by Linus Torvalds
parent 93a8c3cd9e
commit b25e82e567
3 changed files with 31 additions and 13 deletions
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33
fs/fuse/file.c
View file

@ -443,30 +443,37 @@ out:
return err; return err;
} }
static size_t fuse_send_write(struct fuse_req *req, struct file *file, static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
struct inode *inode, loff_t pos, size_t count) struct inode *inode, loff_t pos, size_t count,
int writepage)
{ {
struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_write_in *inarg = &req->misc.write.in;
struct fuse_file *ff = file->private_data; struct fuse_write_out *outarg = &req->misc.write.out;
struct fuse_write_in inarg;
struct fuse_write_out outarg;
memset(&inarg, 0, sizeof(struct fuse_write_in)); memset(inarg, 0, sizeof(struct fuse_write_in));
inarg.fh = ff->fh; inarg->fh = ff->fh;
inarg.offset = pos; inarg->offset = pos;
inarg.size = count; inarg->size = count;
inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0;
req->in.h.opcode = FUSE_WRITE; req->in.h.opcode = FUSE_WRITE;
req->in.h.nodeid = get_node_id(inode); req->in.h.nodeid = get_node_id(inode);
req->in.argpages = 1; req->in.argpages = 1;
req->in.numargs = 2; req->in.numargs = 2;
req->in.args[0].size = sizeof(struct fuse_write_in); req->in.args[0].size = sizeof(struct fuse_write_in);
req->in.args[0].value = &inarg; req->in.args[0].value = inarg;
req->in.args[1].size = count; req->in.args[1].size = count;
req->out.numargs = 1; req->out.numargs = 1;
req->out.args[0].size = sizeof(struct fuse_write_out); req->out.args[0].size = sizeof(struct fuse_write_out);
req->out.args[0].value = &outarg; req->out.args[0].value = outarg;
}
static size_t fuse_send_write(struct fuse_req *req, struct file *file,
struct inode *inode, loff_t pos, size_t count)
{
struct fuse_conn *fc = get_fuse_conn(inode);
fuse_write_fill(req, file->private_data, inode, pos, count, 0);
request_send(fc, req); request_send(fc, req);
return outarg.size; return req->misc.write.out.size;
} }
static int fuse_write_begin(struct file *file, struct address_space *mapping, static int fuse_write_begin(struct file *file, struct address_space *mapping,

4
fs/fuse/fuse_i.h
View file

@ -219,6 +219,10 @@ struct fuse_req {
struct fuse_init_in init_in; struct fuse_init_in init_in;
struct fuse_init_out init_out; struct fuse_init_out init_out;
struct fuse_read_in read_in; struct fuse_read_in read_in;
struct {
struct fuse_write_in in;
struct fuse_write_out out;
} write;
struct fuse_lk_in lk_in; struct fuse_lk_in lk_in;
} misc; } misc;

7
include/linux/fuse.h
View file

@ -119,6 +119,13 @@ struct fuse_file_lock {
*/ */
#define FUSE_LK_FLOCK (1 << 0) #define FUSE_LK_FLOCK (1 << 0)
/**
* WRITE flags
*
* FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
*/
#define FUSE_WRITE_CACHE (1 << 0)
enum fuse_opcode { enum fuse_opcode {
FUSE_LOOKUP = 1, FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */ FUSE_FORGET = 2, /* no reply */