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>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 9c9e35e42bfd..de25bff31420 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -233,8 +233,6 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
         spin_unlock(&fc->lock);
         dput(req->dentry);
         mntput(req->vfsmount);
-        if (req->file)
-                fput(req->file);
         wake_up(&req->waitq);
         if (end)
                 end(fc, req);