ceph: don't use special DIO path for encrypted inodes

Eventually I want to merge the synchronous and direct read codepaths,
possibly via new netfs infrastructure. For now, the direct path is not
crypto-enabled, so use the sync read/write paths instead.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Author: jtlayton

fs/ceph/file.c

@@ -1738,7 +1738,9 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
 		     ceph_cap_string(got));
 
 		if (!ceph_has_inline_data(ci)) {
-			if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
+			if (!retry_op &&
+			    (iocb->ki_flags & IOCB_DIRECT) &&
+			    !IS_ENCRYPTED(inode)) {
 				ret = ceph_direct_read_write(iocb, to,
 							     NULL, NULL);
 				if (ret >= 0 && ret < len)
@@ -2024,7 +2026,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
 
 		/* we might need to revert back to that point */
 		data = *from;
-		if (iocb->ki_flags & IOCB_DIRECT)
+		if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
 			written = ceph_direct_read_write(iocb, &data, snapc,
 							 &prealloc_cf);
 		else