git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/acl.h

   1 /*
   2   File: fs/bch/acl.h
   3
   4   (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
   5 */
   6
   7 #include <linux/posix_acl_xattr.h>
   8
   9 #define BCH_ACL_VERSION 0x0001
  10
  11 typedef struct {
  12         __le16          e_tag;
  13         __le16          e_perm;
  14         __le32          e_id;
  15 } bch_acl_entry;
  16
  17 typedef struct {
  18         __le16          e_tag;
  19         __le16          e_perm;
  20 } bch_acl_entry_short;
  21
  22 typedef struct {
  23         __le32          a_version;
  24 } bch_acl_header;
  25
  26 static inline size_t bch2_acl_size(int count)
  27 {
  28         if (count <= 4) {
  29                 return sizeof(bch_acl_header) +
  30                        count * sizeof(bch_acl_entry_short);
  31         } else {
  32                 return sizeof(bch_acl_header) +
  33                        4 * sizeof(bch_acl_entry_short) +
  34                        (count - 4) * sizeof(bch_acl_entry);
  35         }
  36 }
  37
  38 static inline int bch2_acl_count(size_t size)
  39 {
  40         ssize_t s;
  41
  42         size -= sizeof(bch_acl_header);
  43         s = size - 4 * sizeof(bch_acl_entry_short);
  44         if (s < 0) {
  45                 if (size % sizeof(bch_acl_entry_short))
  46                         return -1;
  47                 return size / sizeof(bch_acl_entry_short);
  48         } else {
  49                 if (s % sizeof(bch_acl_entry))
  50                         return -1;
  51                 return s / sizeof(bch_acl_entry) + 4;
  52         }
  53 }
  54
  55 extern struct posix_acl *bch2_get_acl(struct inode *, int);
  56 extern int bch2_set_acl(struct inode *, struct posix_acl *, int);