fs/ext3/xattr_user.c

   1 /*
   2  * linux/fs/ext3/xattr_user.c
   3  * Handler for extended user attributes.
   4  *
   5  * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
   6  */
   7
   8 #include "ext3.h"
   9 #include "xattr.h"
  10
  11 static size_t
  12 ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
  13                 const char *name, size_t name_len, int type)
  14 {
  15         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
  16         const size_t total_len = prefix_len + name_len + 1;
  17
  18         if (!test_opt(dentry->d_sb, XATTR_USER))
  19                 return 0;
  20
  21         if (list && total_len <= list_size) {
  22                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
  23                 memcpy(list+prefix_len, name, name_len);
  24                 list[prefix_len + name_len] = '\0';
  25         }
  26         return total_len;
  27 }
  28
  29 static int
  30 ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
  31                 size_t size, int type)
  32 {
  33         if (strcmp(name, "") == 0)
  34                 return -EINVAL;
  35         if (!test_opt(dentry->d_sb, XATTR_USER))
  36                 return -EOPNOTSUPP;
  37         return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER,
  38                               name, buffer, size);
  39 }
  40
  41 static int
  42 ext3_xattr_user_set(struct dentry *dentry, const char *name,
  43                 const void *value, size_t size, int flags, int type)
  44 {
  45         if (strcmp(name, "") == 0)
  46                 return -EINVAL;
  47         if (!test_opt(dentry->d_sb, XATTR_USER))
  48                 return -EOPNOTSUPP;
  49         return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER,
  50                               name, value, size, flags);
  51 }
  52
  53 const struct xattr_handler ext3_xattr_user_handler = {
  54         .prefix = XATTR_USER_PREFIX,
  55         .list   = ext3_xattr_user_list,
  56         .get    = ext3_xattr_user_get,
  57         .set    = ext3_xattr_user_set,
  58 };