1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 File: fs/ext4/acl.h 4 5 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> 6 */ 7 8 #include <linux/posix_acl_xattr.h> 9 10 #define EXT4_ACL_VERSION 0x0001 11 12 typedef struct { 13 __le16 e_tag; 14 __le16 e_perm; 15 __le32 e_id; 16 } ext4_acl_entry; 17 18 typedef struct { 19 __le16 e_tag; 20 __le16 e_perm; 21 } ext4_acl_entry_short; 22 23 typedef struct { 24 __le32 a_version; 25 } ext4_acl_header; 26 27 static 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 39 static 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_ACL 56 57 /* acl.c */ 58 struct posix_acl *ext4_get_acl(struct inode *inode, int type, bool rcu); 59 int ext4_set_acl(struct user_namespace *mnt_userns, struct inode *inode, 60 struct posix_acl *acl, int type); 61 extern 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 NULL 66 #define ext4_set_acl NULL 67 68 static inline int 69 ext4_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