fs/reiserfs/xattr_security.c

   1 #include <linux/reiserfs_fs.h>
   2 #include <linux/errno.h>
   3 #include <linux/fs.h>
   4 #include <linux/pagemap.h>
   5 #include <linux/xattr.h>
   6 #include <linux/reiserfs_xattr.h>
   7 #include <asm/uaccess.h>
   8
   9 #define XATTR_SECURITY_PREFIX "security."
  10
  11 static int
  12 security_get (struct inode *inode, const char *name, void *buffer, size_t size)
  13 {
  14     if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  15         return -EINVAL;
  16
  17     if (is_reiserfs_priv_object(inode))
  18         return -EPERM;
  19
  20     return reiserfs_xattr_get (inode, name, buffer, size);
  21 }
  22
  23 static int
  24 security_set (struct inode *inode, const char *name, const void *buffer,
  25           size_t size, int flags)
  26 {
  27     if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  28         return -EINVAL;
  29
  30     if (is_reiserfs_priv_object(inode))
  31         return -EPERM;
  32
  33     return reiserfs_xattr_set (inode, name, buffer, size, flags);
  34 }
  35
  36 static int
  37 security_del (struct inode *inode, const char *name)
  38 {
  39     if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  40         return -EINVAL;
  41
  42     if (is_reiserfs_priv_object(inode))
  43         return -EPERM;
  44
  45     return 0;
  46 }
  47
  48 static int
  49 security_list (struct inode *inode, const char *name, int namelen, char *out)
  50 {
  51     int len = namelen;
  52
  53     if (is_reiserfs_priv_object(inode))
  54         return 0;
  55
  56     if (out)
  57         memcpy (out, name, len);
  58
  59     return len;
  60 }
  61
  62
  63 struct reiserfs_xattr_handler security_handler = {
  64         .prefix = XATTR_SECURITY_PREFIX,
  65         .get = security_get,
  66         .set = security_set,
  67         .del = security_del,
  68         .list = security_list,
  69 };