fuse: add internal open/release helpers

Clean out 'struct file' from internal helpers.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/fuse/file.c

@@ -19,14 +19,15 @@
 #include <linux/uio.h>
 #include <linux/fs.h>
 
-static int fuse_send_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
-			  int opcode, struct fuse_open_out *outargp)
+static int fuse_send_open(struct fuse_mount *fm, u64 nodeid,
+			  unsigned int open_flags, int opcode,
+			  struct fuse_open_out *outargp)
 {
 	struct fuse_open_in inarg;
 	FUSE_ARGS(args);
 
 	memset(&inarg, 0, sizeof(inarg));
-	inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
+	inarg.flags = open_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
 	if (!fm->fc->atomic_o_trunc)
 		inarg.flags &= ~O_TRUNC;
 
@@ -123,8 +124,8 @@ static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir)
 	}
 }
 
-int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
-		 bool isdir)
+struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid,
+				 unsigned int open_flags, bool isdir)
 {
 	struct fuse_conn *fc = fm->fc;
 	struct fuse_file *ff;
@@ -132,7 +133,7 @@ int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
 
 	ff = fuse_file_alloc(fm);
 	if (!ff)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	ff->fh = 0;
 	/* Default for no-open */
@@ -141,14 +142,14 @@ int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
 		struct fuse_open_out outarg;
 		int err;
 
-		err = fuse_send_open(fm, nodeid, file, opcode, &outarg);
+		err = fuse_send_open(fm, nodeid, open_flags, opcode, &outarg);
 		if (!err) {
 			ff->fh = outarg.fh;
 			ff->open_flags = outarg.open_flags;
 
 		} else if (err != -ENOSYS) {
 			fuse_file_free(ff);
-			return err;
+			return ERR_PTR(err);
 		} else {
 			if (isdir)
 				fc->no_opendir = 1;
@@ -161,9 +162,19 @@ int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
 		ff->open_flags &= ~FOPEN_DIRECT_IO;
 
 	ff->nodeid = nodeid;
-	file->private_data = ff;
 
-	return 0;
+	return ff;
+}
+
+int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
+		 bool isdir)
+{
+	struct fuse_file *ff = fuse_file_open(fm, nodeid, file->f_flags, isdir);
+
+	if (!IS_ERR(ff))
+		file->private_data = ff;
+
+	return PTR_ERR_OR_ZERO(ff);
 }
 EXPORT_SYMBOL_GPL(fuse_do_open);
 
@@ -284,22 +295,21 @@ static void fuse_prepare_release(struct fuse_inode *fi, struct fuse_file *ff,
 	ra->args.nocreds = true;
 }
 
-void fuse_release_common(struct file *file, bool isdir)
+void fuse_file_release(struct inode *inode, struct fuse_file *ff,
+		       unsigned int open_flags, fl_owner_t id, bool isdir)
 {
-	struct fuse_inode *fi = get_fuse_inode(file_inode(file));
-	struct fuse_file *ff = file->private_data;
+	struct fuse_inode *fi = get_fuse_inode(inode);
 	struct fuse_release_args *ra = ff->release_args;
 	int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
 
-	fuse_prepare_release(fi, ff, file->f_flags, opcode);
+	fuse_prepare_release(fi, ff, open_flags, opcode);
 
 	if (ff->flock) {
 		ra->inarg.release_flags |= FUSE_RELEASE_FLOCK_UNLOCK;
-		ra->inarg.lock_owner = fuse_lock_owner_id(ff->fm->fc,
-							  (fl_owner_t) file);
+		ra->inarg.lock_owner = fuse_lock_owner_id(ff->fm->fc, id);
 	}
 	/* Hold inode until release is finished */
-	ra->inode = igrab(file_inode(file));
+	ra->inode = igrab(inode);
 
 	/*
 	 * Normally this will send the RELEASE request, however if
@@ -313,6 +323,12 @@ void fuse_release_common(struct file *file, bool isdir)
 	fuse_file_put(ff, ff->fm->fc->destroy, isdir);
 }
 
+void fuse_release_common(struct file *file, bool isdir)
+{
+	fuse_file_release(file_inode(file), file->private_data, file->f_flags,
+			  (fl_owner_t) file, isdir);
+}
+
 static int fuse_open(struct inode *inode, struct file *file)
 {
 	return fuse_open_common(inode, file, false);

fs/fuse/fuse_i.h

@@ -1242,4 +1242,11 @@ long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
 			    unsigned long arg);
 
+/* file.c */
+
+struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid,
+				 unsigned int open_flags, bool isdir);
+void fuse_file_release(struct inode *inode, struct fuse_file *ff,
+		       unsigned int open_flags, fl_owner_t id, bool isdir);
+
 #endif /* _FS_FUSE_I_H */