linux-stable/fs/ext2/acl.h
Christian Brauner 549c729771
fs: make helpers idmap mount aware
Extend some inode methods with an additional user namespace argument. A
filesystem that is aware of idmapped mounts will receive the user
namespace the mount has been marked with. This can be used for
additional permission checking and also to enable filesystems to
translate between uids and gids if they need to. We have implemented all
relevant helpers in earlier patches.

As requested we simply extend the exisiting inode method instead of
introducing new ones. This is a little more code churn but it's mostly
mechanical and doesnt't leave us with additional inode methods.

Link: https://lore.kernel.org/r/20210121131959.646623-25-christian.brauner@ubuntu.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
2021-01-24 14:27:20 +01:00

73 lines
1.5 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
File: fs/ext2/acl.h
(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
#include <linux/posix_acl_xattr.h>
#define EXT2_ACL_VERSION 0x0001
typedef struct {
__le16 e_tag;
__le16 e_perm;
__le32 e_id;
} ext2_acl_entry;
typedef struct {
__le16 e_tag;
__le16 e_perm;
} ext2_acl_entry_short;
typedef struct {
__le32 a_version;
} ext2_acl_header;
static inline size_t ext2_acl_size(int count)
{
if (count <= 4) {
return sizeof(ext2_acl_header) +
count * sizeof(ext2_acl_entry_short);
} else {
return sizeof(ext2_acl_header) +
4 * sizeof(ext2_acl_entry_short) +
(count - 4) * sizeof(ext2_acl_entry);
}
}
static inline int ext2_acl_count(size_t size)
{
ssize_t s;
size -= sizeof(ext2_acl_header);
s = size - 4 * sizeof(ext2_acl_entry_short);
if (s < 0) {
if (size % sizeof(ext2_acl_entry_short))
return -1;
return size / sizeof(ext2_acl_entry_short);
} else {
if (s % sizeof(ext2_acl_entry))
return -1;
return s / sizeof(ext2_acl_entry) + 4;
}
}
#ifdef CONFIG_EXT2_FS_POSIX_ACL
/* acl.c */
extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
extern int ext2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
struct posix_acl *acl, int type);
extern int ext2_init_acl (struct inode *, struct inode *);
#else
#include <linux/sched.h>
#define ext2_get_acl NULL
#define ext2_set_acl NULL
static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
{
return 0;
}
#endif