[PATCH] ecryptfs: check xattr operation support fix

  - ecryptfs_write_inode_size_to_metadata() error code was ignored.
  - i_op->setxattr() must be supported by lower fs because used below.

Signed-off-by: Monakhov Dmitriy <dmonakhov@openvz.org>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ecryptfs/inode.c

@@ -168,9 +168,9 @@ static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file,
 		goto out;
 	}
 	i_size_write(inode, 0);
-	ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode, inode,
-					      ecryptfs_dentry,
-					      ECRYPTFS_LOWER_I_MUTEX_NOT_HELD);
+	rc = ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode,
+			inode, ecryptfs_dentry,
+			ECRYPTFS_LOWER_I_MUTEX_NOT_HELD);
 	ecryptfs_inode_to_private(inode)->crypt_stat.flags |= ECRYPTFS_NEW_FILE;
 out:
 	return rc;

fs/ecryptfs/mmap.c

@@ -502,7 +502,8 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *lower_inode,
 		goto out;
 	}
 	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
-	if (!lower_dentry->d_inode->i_op->getxattr) {
+	if (!lower_dentry->d_inode->i_op->getxattr ||
+			!lower_dentry->d_inode->i_op->setxattr) {
 		printk(KERN_WARNING
 		       "No support for setting xattr in lower filesystem\n");
 		rc = -ENOSYS;