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fuse: implement ->tmpfile()

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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>
This commit is contained in:
Miklos Szeredi 2022-09-24 07:00:00 +02:00
parent 863f144f12
commit 7d37539037
3 changed files with 29 additions and 4 deletions
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24
fs/fuse/dir.c
View File

@ -529,7 +529,7 @@ out_err:
*/
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,

3
fs/fuse/fuse_i.h
View File

@ -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;

6
include/uapi/linux/fuse.h
View File

@ -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,