fs/reiserfs/xattr_trusted.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_TRUSTED_PREFIX "trusted."
  10
  11 static int
  12 trusted_get (struct inode *inode, const char *name, void *buffer, size_t size)
  13 {
  14     if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  15         return -EINVAL;
  16
  17     if (!reiserfs_xattrs (inode->i_sb))
  18         return -EOPNOTSUPP;
  19
  20     if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  21         return -EPERM;
  22
  23     return reiserfs_xattr_get (inode, name, buffer, size);
  24 }
  25
  26 static int
  27 trusted_set (struct inode *inode, const char *name, const void *buffer,
  28           size_t size, int flags)
  29 {
  30     if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  31         return -EINVAL;
  32
  33     if (!reiserfs_xattrs (inode->i_sb))
  34         return -EOPNOTSUPP;
  35
  36     if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  37         return -EPERM;
  38
  39     return reiserfs_xattr_set (inode, name, buffer, size, flags);
  40 }
  41
  42 static int
  43 trusted_del (struct inode *inode, const char *name)
  44 {
  45     if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  46         return -EINVAL;
  47
  48     if (!reiserfs_xattrs (inode->i_sb))
  49         return -EOPNOTSUPP;
  50
  51     if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  52         return -EPERM;
  53
  54     return 0;
  55 }
  56
  57 static int
  58 trusted_list (struct inode *inode, const char *name, int namelen, char *out)
  59 {
  60     int len = namelen;
  61
  62     if (!reiserfs_xattrs (inode->i_sb))
  63         return 0;
  64
  65     if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  66         return 0;
  67
  68     if (out)
  69         memcpy (out, name, len);
  70
  71     return len;
  72 }
  73
  74
  75 struct reiserfs_xattr_handler trusted_handler = {
  76         .prefix = XATTR_TRUSTED_PREFIX,
  77         .get = trusted_get,
  78         .set = trusted_set,
  79         .del = trusted_del,
  80         .list = trusted_list,
  81 };