fs/ext4/xattr_user.c

   1 /*
   2  * linux/fs/ext4/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 <linux/string.h>
   9 #include <linux/fs.h>
  10 #include "ext4_jbd2.h"
  11 #include "ext4.h"
  12 #include "xattr.h"
  13
  14 static bool
  15 ext4_xattr_user_list(struct dentry *dentry)
  16 {
  17         return test_opt(dentry->d_sb, XATTR_USER);
  18 }
  19
  20 static int
  21 ext4_xattr_user_get(const struct xattr_handler *handler,
  22                     struct dentry *dentry, const char *name,
  23                     void *buffer, size_t size)
  24 {
  25         if (!test_opt(dentry->d_sb, XATTR_USER))
  26                 return -EOPNOTSUPP;
  27         return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_USER,
  28                               name, buffer, size);
  29 }
  30
  31 static int
  32 ext4_xattr_user_set(const struct xattr_handler *handler,
  33                     struct dentry *dentry, const char *name,
  34                     const void *value, size_t size, int flags)
  35 {
  36         if (!test_opt(dentry->d_sb, XATTR_USER))
  37                 return -EOPNOTSUPP;
  38         return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_USER,
  39                               name, value, size, flags);
  40 }
  41
  42 const struct xattr_handler ext4_xattr_user_handler = {
  43         .prefix = XATTR_USER_PREFIX,
  44         .list   = ext4_xattr_user_list,
  45         .get    = ext4_xattr_user_get,
  46         .set    = ext4_xattr_user_set,
  47 };