LXR linux/fs/ext4/acl.h

   1/*
   2  File: fs/ext4/acl.h
   3
   4  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
   5*/
   6
   7#include <linux/posix_acl_xattr.h>
   8
   9#define EXT4_ACL_VERSION        0x0001
  10
  11typedef struct {
  12        __le16          e_tag;
  13        __le16          e_perm;
  14        __le32          e_id;
  15} ext4_acl_entry;
  16
  17typedef struct {
  18        __le16          e_tag;
  19        __le16          e_perm;
  20} ext4_acl_entry_short;
  21
  22typedef struct {
  23        __le32          a_version;
  24} ext4_acl_header;
  25
  26static inline size_t ext4_acl_size(int count)
  27{
  28        if (count <= 4) {
  29                return sizeof(ext4_acl_header) +
  30                       count * sizeof(ext4_acl_entry_short);
  31        } else {
  32                return sizeof(ext4_acl_header) +
  33                       4 * sizeof(ext4_acl_entry_short) +
  34                       (count - 4) * sizeof(ext4_acl_entry);
  35        }
  36}
  37
  38static inline int ext4_acl_count(size_t size)
  39{
  40        ssize_t s;
  41        size -= sizeof(ext4_acl_header);
  42        s = size - 4 * sizeof(ext4_acl_entry_short);
  43        if (s < 0) {
  44                if (size % sizeof(ext4_acl_entry_short))
  45                        return -1;
  46                return size / sizeof(ext4_acl_entry_short);
  47        } else {
  48                if (s % sizeof(ext4_acl_entry))
  49                        return -1;
  50                return s / sizeof(ext4_acl_entry) + 4;
  51        }
  52}
  53
  54#ifdef CONFIG_EXT4_FS_POSIX_ACL
  55
  56/* acl.c */
  57struct posix_acl *ext4_get_acl(struct inode *inode, int type);
  58int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type);
  59extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
  60
  61#else  /* CONFIG_EXT4_FS_POSIX_ACL */
  62#include <linux/sched.h>
  63#define ext4_get_acl NULL
  64#define ext4_set_acl NULL
  65
  66static inline int
  67ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
  68{
  69        return 0;
  70}
  71#endif  /* CONFIG_EXT4_FS_POSIX_ACL */
  72
  73