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// SPDX-License-Identifier: GPL-2.0
/*
File: fs/ext4/acl.h
(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
#include <linux/posix_acl_xattr.h>
#define EXT4_ACL_VERSION 0x0001
typedef struct {
__le16 e_tag;
__le16 e_perm;
__le32 e_id;
} ext4_acl_entry;
typedef struct {
__le16 e_tag;
__le16 e_perm;
} ext4_acl_entry_short;
typedef struct {
__le32 a_version;
} ext4_acl_header;
static inline size_t ext4_acl_size(int count)
{
if (count <= 4) {
return sizeof(ext4_acl_header) +
count * sizeof(ext4_acl_entry_short);
} else {
return sizeof(ext4_acl_header) +
4 * sizeof(ext4_acl_entry_short) +
(count - 4) * sizeof(ext4_acl_entry);
}
}
static inline int ext4_acl_count(size_t size)
{
ssize_t s;
size -= sizeof(ext4_acl_header);
s = size - 4 * sizeof(ext4_acl_entry_short);
if (s < 0) {
if (size % sizeof(ext4_acl_entry_short))
return -1;
return size / sizeof(ext4_acl_entry_short);
} else {
if (s % sizeof(ext4_acl_entry))
return -1;
return s / sizeof(ext4_acl_entry) + 4;
}
}
#ifdef CONFIG_EXT4_FS_POSIX_ACL
/* acl.c */
struct posix_acl *ext4_get_acl(struct inode *inode, int type, bool rcu);
int ext4_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
struct posix_acl *acl, int type);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
#else /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_get_acl NULL
#define ext4_set_acl NULL
static inline int
ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
/* usually, the umask is applied by posix_acl_create(), but if
ext4 ACL support is disabled at compile time, we need to do
it here, because posix_acl_create() will never be called */
inode->i_mode &= ~current_umask();
return 0;
}
#endif /* CONFIG_EXT4_FS_POSIX_ACL */
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