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Linux/fs/ext4/acl.h

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  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);
 59 int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 60 extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
 61 
 62 #else  /* CONFIG_EXT4_FS_POSIX_ACL */
 63 #include <linux/sched.h>
 64 #define ext4_get_acl NULL
 65 #define ext4_set_acl NULL
 66 
 67 static inline int
 68 ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
 69 {
 70         return 0;
 71 }
 72 #endif  /* CONFIG_EXT4_FS_POSIX_ACL */
 73 
 74 

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