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authorMiklos Szeredi <mszeredi@suse.cz>2007-10-18 03:07:03 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:31 -0700
commitb25e82e5673c750116e8b01a4fc7d09be7809f8c (patch)
tree03d23ccbca6e87ba98efeba445ff714455dba0bb
parent93a8c3cd9e9834dc5f5c373336f3a0065521152d (diff)
downloadop-kernel-dev-b25e82e5673c750116e8b01a4fc7d09be7809f8c.zip
op-kernel-dev-b25e82e5673c750116e8b01a4fc7d09be7809f8c.tar.gz
fuse: add helper for asynchronous writes
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>
-rw-r--r--fs/fuse/file.c33
-rw-r--r--fs/fuse/fuse_i.h4
-rw-r--r--include/linux/fuse.h7
3 files changed, 31 insertions, 13 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c4c59c7..2b589de 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -443,30 +443,37 @@ out:
return err;
}
-static size_t fuse_send_write(struct fuse_req *req, struct file *file,
- struct inode *inode, loff_t pos, size_t count)
+static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
+ struct inode *inode, loff_t pos, size_t count,
+ int writepage)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_file *ff = file->private_data;
- struct fuse_write_in inarg;
- struct fuse_write_out outarg;
+ struct fuse_write_in *inarg = &req->misc.write.in;
+ struct fuse_write_out *outarg = &req->misc.write.out;
- memset(&inarg, 0, sizeof(struct fuse_write_in));
- inarg.fh = ff->fh;
- inarg.offset = pos;
- inarg.size = count;
+ memset(inarg, 0, sizeof(struct fuse_write_in));
+ inarg->fh = ff->fh;
+ inarg->offset = pos;
+ inarg->size = count;
+ inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0;
req->in.h.opcode = FUSE_WRITE;
req->in.h.nodeid = get_node_id(inode);
req->in.argpages = 1;
req->in.numargs = 2;
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->out.numargs = 1;
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);
- return outarg.size;
+ return req->misc.write.out.size;
}
static int fuse_write_begin(struct file *file, struct address_space *mapping,
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 5657cca..8b64a63 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -219,6 +219,10 @@ struct fuse_req {
struct fuse_init_in init_in;
struct fuse_init_out init_out;
struct fuse_read_in read_in;
+ struct {
+ struct fuse_write_in in;
+ struct fuse_write_out out;
+ } write;
struct fuse_lk_in lk_in;
} misc;
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 015a8b1..6f4a312 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -119,6 +119,13 @@ struct fuse_file_lock {
*/
#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 {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
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