Commit 7d375390 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

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: default avatarChristian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 863f144f

fs/fuse/dir.c

+21 −3
Original line number Diff line number Diff line
@@ -529,7 +529,7 @@ static int get_security_context(struct dentry *entry, umode_t mode, 
 */

static int fuse_create_open(struct inode *dir, struct dentry *entry,

			    struct file *file, unsigned int flags,

			    umode_t mode)

			    umode_t mode, u32 opcode)

{

	int err;

	struct inode *inode;
@@ -573,7 +573,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, 
		inarg.open_flags |= FUSE_OPEN_KILL_SUIDGID;

	}



	args.opcode = FUSE_CREATE;

	args.opcode = opcode;

	args.nodeid = get_node_id(dir);

	args.in_numargs = 2;

	args.in_args[0].size = sizeof(inarg);
@@ -676,7 +676,7 @@ static int fuse_atomic_open(struct inode *dir, struct dentry *entry, 
	if (fc->no_create)

		goto mknod;



	err = fuse_create_open(dir, entry, file, flags, mode);

	err = fuse_create_open(dir, entry, file, flags, mode, FUSE_CREATE);

	if (err == -ENOSYS) {

		fc->no_create = 1;

		goto mknod;
@@ -802,6 +802,23 @@ static int fuse_create(struct user_namespace *mnt_userns, struct inode *dir, 
	return fuse_mknod(&init_user_ns, dir, entry, mode, 0);

}



static int fuse_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,

			struct file *file, umode_t mode)

{

	struct fuse_conn *fc = get_fuse_conn(dir);

	int err;



	if (fc->no_tmpfile)

		return -EOPNOTSUPP;



	err = fuse_create_open(dir, file->f_path.dentry, file, file->f_flags, mode, FUSE_TMPFILE);

	if (err == -ENOSYS) {

		fc->no_tmpfile = 1;

		err = -EOPNOTSUPP;

	}

	return err;

}



static int fuse_mkdir(struct user_namespace *mnt_userns, struct inode *dir,

		      struct dentry *entry, umode_t mode)

{
@@ -1913,6 +1930,7 @@ static const struct inode_operations fuse_dir_inode_operations = { 
	.setattr	= fuse_setattr,

	.create		= fuse_create,

	.atomic_open	= fuse_atomic_open,

	.tmpfile	= fuse_tmpfile,

	.mknod		= fuse_mknod,

	.permission	= fuse_permission,

	.getattr	= fuse_getattr,

fs/fuse/fuse_i.h

+3 −0
Original line number Diff line number Diff line
@@ -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;

include/uapi/linux/fuse.h

+5 −1
Original line number Diff line number Diff line
@@ -194,6 +194,9 @@ 
 *  - add FUSE_SECURITY_CTX init flag

 *  - add security context to create, mkdir, symlink, and mknod requests

 *  - add FUSE_HAS_INODE_DAX, FUSE_ATTR_DAX

 *

 *  7.37

 *  - add FUSE_TMPFILE

 */



#ifndef _LINUX_FUSE_H
@@ -229,7 +232,7 @@ 
#define FUSE_KERNEL_VERSION 7



/** Minor version number of this interface */

#define FUSE_KERNEL_MINOR_VERSION 36

#define FUSE_KERNEL_MINOR_VERSION 37



/** The node ID of the root inode */

#define FUSE_ROOT_ID 1
@@ -537,6 +540,7 @@ enum fuse_opcode { 
	FUSE_SETUPMAPPING	= 48,

	FUSE_REMOVEMAPPING	= 49,

	FUSE_SYNCFS		= 50,

	FUSE_TMPFILE		= 51,



	/* CUSE specific operations */

	CUSE_INIT		= 4096,