fuse: add reference counting to fuse_file
Make lifetime of 'struct fuse_file' independent from 'struct file' by adding a
reference counter and destructor.
This will enable asynchronous page writeback, where it cannot be guaranteed,
that the file is not released while a request with this file handle is being
served.
The actual RELEASE request is only sent when there are no more references to
the fuse_file.
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>
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 95bcb43..60683b7 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -72,6 +72,9 @@
/** File handle used by userspace */
u64 fh;
+
+ /** Refcount */
+ atomic_t count;
};
/** One input argument of a request */
@@ -216,7 +219,7 @@
unsigned page_offset;
/** File used in the request (or NULL) */
- struct file *file;
+ struct fuse_file *ff;
/** vfsmount used in release */
struct vfsmount *vfsmount;
@@ -420,7 +423,7 @@
/**
* Initialize READ or READDIR request
*/
-void fuse_read_fill(struct fuse_req *req, struct file *file,
+void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
struct inode *inode, loff_t pos, size_t count, int opcode);
/**
@@ -433,9 +436,9 @@
void fuse_finish_open(struct inode *inode, struct file *file,
struct fuse_file *ff, struct fuse_open_out *outarg);
-/** */
-struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags,
- int opcode);
+/** Fill in ff->reserved_req with a RELEASE request */
+void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode);
+
/**
* Send RELEASE or RELEASEDIR request
*/