fuse: implement ->tmpfile()

This is basically equivalent to the FUSE_CREATE operation which creates and
opens a regular file.

Add a new FUSE_TMPFILE operation, otherwise just reuse the protocol and the
code for FUSE_CREATE.

Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 488b460e046f..98a9cf531873 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -784,6 +784,9 @@ struct fuse_conn {
 	/* Does the filesystem support per inode DAX? */
 	unsigned int inode_dax:1;
 
+	/* Is tmpfile not implemented by fs? */
+	unsigned int no_tmpfile:1;
+
 	/** The number of requests waiting for completion */
 	atomic_t num_waiting;