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fuse: extend FUSE_SETXATTR request 

Fuse client needs to send additional information to file server when it
calls SETXATTR(system.posix_acl_access), so add extra flags field to the
structure.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Vivek Goyal 2021-03-25 11:18:22 -04:00 committed by Miklos Szeredi
parent 6076f5f341
commit 52a4c95f4d
5 changed files with 21 additions and 6 deletions
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2
fs/fuse/acl.c
View File

@ -94,7 +94,7 @@ int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
return ret;
}
ret = fuse_setxattr(inode, name, value, size, 0);
ret = fuse_setxattr(inode, name, value, size, 0, 0);
kfree(value);
} else {
ret = fuse_removexattr(inode, name);

5
fs/fuse/fuse_i.h
View File

@ -668,6 +668,9 @@ struct fuse_conn {
/** Is setxattr not implemented by fs? */
unsigned no_setxattr:1;
/** Does file server support extended setxattr */
unsigned setxattr_ext:1;
/** Is getxattr not implemented by fs? */
unsigned no_getxattr:1;
@ -1171,7 +1174,7 @@ void fuse_unlock_inode(struct inode *inode, bool locked);
bool fuse_lock_inode(struct inode *inode);
int fuse_setxattr(struct inode *inode, const char *name, const void *value,
size_t size, int flags);
size_t size, int flags, unsigned int extra_flags);
ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
size_t size);
ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);

4
fs/fuse/inode.c
View File

@ -1052,6 +1052,8 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
fc->handle_killpriv_v2 = 1;
fm->sb->s_flags |= SB_NOSEC;
}
if (arg->flags & FUSE_SETXATTR_EXT)
fc->setxattr_ext = 1;
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
@ -1095,7 +1097,7 @@ void fuse_send_init(struct fuse_mount *fm)
FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA |
FUSE_HANDLE_KILLPRIV_V2;
FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT;
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
ia->in.flags |= FUSE_MAP_ALIGNMENT;

9
fs/fuse/xattr.c
View File

@ -12,7 +12,7 @@
#include <linux/posix_acl_xattr.h>
int fuse_setxattr(struct inode *inode, const char *name, const void *value,
size_t size, int flags)
size_t size, int flags, unsigned int extra_flags)
{
struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
@ -25,10 +25,13 @@ int fuse_setxattr(struct inode *inode, const char *name, const void *value,
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
inarg.flags = flags;
inarg.setxattr_flags = extra_flags;
args.opcode = FUSE_SETXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 3;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].size = fm->fc->setxattr_ext ?
sizeof(inarg) : FUSE_COMPAT_SETXATTR_IN_SIZE;
args.in_args[0].value = &inarg;
args.in_args[1].size = strlen(name) + 1;
args.in_args[1].value = name;
@ -199,7 +202,7 @@ static int fuse_xattr_set(const struct xattr_handler *handler,
if (!value)
return fuse_removexattr(inode, name);
return fuse_setxattr(inode, name, value, size, flags);
return fuse_setxattr(inode, name, value, size, flags, 0);
}
static bool no_xattr_list(struct dentry *dentry)

7
include/uapi/linux/fuse.h
View File

@ -179,6 +179,7 @@
* 7.33
* - add FUSE_HANDLE_KILLPRIV_V2, FUSE_WRITE_KILL_SUIDGID, FATTR_KILL_SUIDGID
* - add FUSE_OPEN_KILL_SUIDGID
* - extend fuse_setxattr_in, add FUSE_SETXATTR_EXT
*/
#ifndef _LINUX_FUSE_H
@ -330,6 +331,7 @@ struct fuse_file_lock {
* does not have CAP_FSETID. Additionally upon
* write/truncate sgid is killed only if file has group
* execute permission. (Same as Linux VFS behavior).
* FUSE_SETXATTR_EXT: Server supports extended struct fuse_setxattr_in
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -360,6 +362,7 @@ struct fuse_file_lock {
#define FUSE_MAP_ALIGNMENT (1 << 26)
#define FUSE_SUBMOUNTS (1 << 27)
#define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
#define FUSE_SETXATTR_EXT (1 << 29)
/**
* CUSE INIT request/reply flags
@ -681,9 +684,13 @@ struct fuse_fsync_in {
uint32_t padding;
};
#define FUSE_COMPAT_SETXATTR_IN_SIZE 8
struct fuse_setxattr_in {
uint32_t size;
uint32_t flags;
uint32_t setxattr_flags;
uint32_t padding;
};
struct fuse_getxattr_in {