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 trusted_del(struct inode *inode, const char *name)
  43 {
  44         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  45                 return -EINVAL;
  46
  47         if (!reiserfs_xattrs(inode->i_sb))
  48                 return -EOPNOTSUPP;
  49
  50         if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  51                 return -EPERM;
  52
  53         return 0;
  54 }
  55
  56 static int
  57 trusted_list(struct inode *inode, const char *name, int namelen, char *out)
  58 {
  59         int len = namelen;
  60
  61         if (!reiserfs_xattrs(inode->i_sb))
  62                 return 0;
  63
  64         if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  65                 return 0;
  66
  67         if (out)
  68                 memcpy(out, name, len);
  69
  70         return len;
  71 }
  72
  73 struct reiserfs_xattr_handler trusted_handler = {
  74         .prefix = XATTR_TRUSTED_PREFIX,
  75         .get = trusted_get,
  76         .set = trusted_set,
  77         .del = trusted_del,
  78         .list = trusted_list,
  79 };