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1// SPDX-License-Identifier: GPL-2.02/*3 File: fs/ext4/acl.h4 5 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>6*/7 8#include <linux/posix_acl_xattr.h>9 10#define EXT4_ACL_VERSION 0x000111 12typedef struct {13 __le16 e_tag;14 __le16 e_perm;15 __le32 e_id;16} ext4_acl_entry;17 18typedef struct {19 __le16 e_tag;20 __le16 e_perm;21} ext4_acl_entry_short;22 23typedef struct {24 __le32 a_version;25} ext4_acl_header;26 27static inline size_t ext4_acl_size(int count)28{29 if (count <= 4) {30 return sizeof(ext4_acl_header) +31 count * sizeof(ext4_acl_entry_short);32 } else {33 return sizeof(ext4_acl_header) +34 4 * sizeof(ext4_acl_entry_short) +35 (count - 4) * sizeof(ext4_acl_entry);36 }37}38 39static inline int ext4_acl_count(size_t size)40{41 ssize_t s;42 size -= sizeof(ext4_acl_header);43 s = size - 4 * sizeof(ext4_acl_entry_short);44 if (s < 0) {45 if (size % sizeof(ext4_acl_entry_short))46 return -1;47 return size / sizeof(ext4_acl_entry_short);48 } else {49 if (s % sizeof(ext4_acl_entry))50 return -1;51 return s / sizeof(ext4_acl_entry) + 4;52 }53}54 55#ifdef CONFIG_EXT4_FS_POSIX_ACL56 57/* acl.c */58struct posix_acl *ext4_get_acl(struct inode *inode, int type, bool rcu);59int ext4_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,60 struct posix_acl *acl, int type);61extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);62 63#else /* CONFIG_EXT4_FS_POSIX_ACL */64#include <linux/sched.h>65#define ext4_get_acl NULL66#define ext4_set_acl NULL67 68static inline int69ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)70{71 return 0;72}73#endif /* CONFIG_EXT4_FS_POSIX_ACL */74 75