LXR linux/fs/reiserfs/xattr

   1#include <linux/reiserfs_fs.h>
   2#include <linux/capability.h>
   3#include <linux/errno.h>
   4#include <linux/fs.h>
   5#include <linux/pagemap.h>
   6#include <linux/xattr.h>
   7#include <linux/reiserfs_xattr.h>
   8#include <asm/uaccess.h>
   9
  10static int
  11trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
  12{
  13        if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  14                return -EINVAL;
  15
  16        if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
  17                return -EPERM;
  18
  19        return reiserfs_xattr_get(inode, name, buffer, size);
  20}
  21
  22static int
  23trusted_set(struct inode *inode, const char *name, const void *buffer,
  24            size_t size, int flags)
  25{
  26        if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  27                return -EINVAL;
  28
  29        if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
  30                return -EPERM;
  31
  32        return reiserfs_xattr_set(inode, name, buffer, size, flags);
  33}
  34
  35static size_t trusted_list(struct inode *inode, char *list, size_t list_size,
  36                           const char *name, size_t name_len)
  37{
  38        const size_t len = name_len + 1;
  39
  40        if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
  41                return 0;
  42
  43        if (list && len <= list_size) {
  44                memcpy(list, name, name_len);
  45                list[name_len] = '\0';
  46        }
  47        return len;
  48}
  49
  50struct xattr_handler reiserfs_xattr_trusted_handler = {
  51        .prefix = XATTR_TRUSTED_PREFIX,
  52        .get = trusted_get,
  53        .set = trusted_set,
  54        .list = trusted_list,
  55};
  56