fs/jffs2/xattr_trusted.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2006  NEC Corporation
   5  *
   6  * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/fs.h>
  14 #include <linux/jffs2.h>
  15 #include <linux/xattr.h>
  16 #include <linux/mtd/mtd.h>
  17 #include "nodelist.h"
  18
  19 static int jffs2_trusted_getxattr(const struct xattr_handler *handler,
  20                                   struct dentry *dentry, const char *name,
  21                                   void *buffer, size_t size)
  22 {
  23         if (!strcmp(name, ""))
  24                 return -EINVAL;
  25         return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
  26                                  name, buffer, size);
  27 }
  28
  29 static int jffs2_trusted_setxattr(const struct xattr_handler *handler,
  30                                   struct dentry *dentry, const char *name,
  31                                   const void *buffer, size_t size, int flags)
  32 {
  33         if (!strcmp(name, ""))
  34                 return -EINVAL;
  35         return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_TRUSTED,
  36                                  name, buffer, size, flags);
  37 }
  38
  39 static size_t jffs2_trusted_listxattr(const struct xattr_handler *handler,
  40                                       struct dentry *dentry, char *list,
  41                                       size_t list_size, const char *name,
  42                                       size_t name_len)
  43 {
  44         size_t retlen = XATTR_TRUSTED_PREFIX_LEN + name_len + 1;
  45
  46         if (!capable(CAP_SYS_ADMIN))
  47                 return 0;
  48
  49         if (list && retlen<=list_size) {
  50                 strcpy(list, XATTR_TRUSTED_PREFIX);
  51                 strcpy(list + XATTR_TRUSTED_PREFIX_LEN, name);
  52         }
  53
  54         return retlen;
  55 }
  56
  57 const struct xattr_handler jffs2_trusted_xattr_handler = {
  58         .prefix = XATTR_TRUSTED_PREFIX,
  59         .list = jffs2_trusted_listxattr,
  60         .set = jffs2_trusted_setxattr,
  61         .get = jffs2_trusted_getxattr
  62 };