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TOMOYO Linux Cross Reference
Linux/fs/ext2/acl.h

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  1 /*
  2   File: fs/ext2/acl.h
  3 
  4   (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
  5 */
  6 
  7 #include <linux/posix_acl_xattr.h>
  8 
  9 #define EXT2_ACL_VERSION        0x0001
 10 
 11 typedef struct {
 12         __le16          e_tag;
 13         __le16          e_perm;
 14         __le32          e_id;
 15 } ext2_acl_entry;
 16 
 17 typedef struct {
 18         __le16          e_tag;
 19         __le16          e_perm;
 20 } ext2_acl_entry_short;
 21 
 22 typedef struct {
 23         __le32          a_version;
 24 } ext2_acl_header;
 25 
 26 static inline size_t ext2_acl_size(int count)
 27 {
 28         if (count <= 4) {
 29                 return sizeof(ext2_acl_header) +
 30                        count * sizeof(ext2_acl_entry_short);
 31         } else {
 32                 return sizeof(ext2_acl_header) +
 33                        4 * sizeof(ext2_acl_entry_short) +
 34                        (count - 4) * sizeof(ext2_acl_entry);
 35         }
 36 }
 37 
 38 static inline int ext2_acl_count(size_t size)
 39 {
 40         ssize_t s;
 41         size -= sizeof(ext2_acl_header);
 42         s = size - 4 * sizeof(ext2_acl_entry_short);
 43         if (s < 0) {
 44                 if (size % sizeof(ext2_acl_entry_short))
 45                         return -1;
 46                 return size / sizeof(ext2_acl_entry_short);
 47         } else {
 48                 if (s % sizeof(ext2_acl_entry))
 49                         return -1;
 50                 return s / sizeof(ext2_acl_entry) + 4;
 51         }
 52 }
 53 
 54 #ifdef CONFIG_EXT2_FS_POSIX_ACL
 55 
 56 /* acl.c */
 57 extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
 58 extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 59 extern int ext2_init_acl (struct inode *, struct inode *);
 60 
 61 #else
 62 #include <linux/sched.h>
 63 #define ext2_get_acl    NULL
 64 #define ext2_set_acl    NULL
 65 
 66 static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
 67 {
 68         return 0;
 69 }
 70 #endif
 71 
 72 

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