From 3373d49f32b2bd8149f633727eba453708a9bf9c Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@fb.com>
Date: Tue, 28 Mar 2017 11:04:44 -0700
Subject: [RHEL7.5 PATCH 160/169] mdadm/r5cache: allow adding journal to
 array without journal

Currently, --add-journal can be only used to recreate broken journal
for arrays with journal since  creation. As the kernel code getting
more mature, this constraint is no longer necessary.

This patch allows --add-journal to add journal to array without
journal.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
 Manage.c   | 6 ------
 mdadm.8.in | 5 ++---
 2 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/Manage.c b/Manage.c
index 04b9398..b82a729 100644
--- a/Manage.c
+++ b/Manage.c
@@ -911,7 +911,6 @@ int Manage_add(int fd, int tfd, struct mddev_dev *dv,
 
 	/* only add journal to array that supports journaling */
 	if (dv->disposition == 'j') {
-		struct mdinfo mdi;
 		struct mdinfo *mdp;
 
 		mdp = sysfs_read(fd, NULL, GET_ARRAY_STATE);
@@ -928,11 +927,6 @@ int Manage_add(int fd, int tfd, struct mddev_dev *dv,
 
 		sysfs_free(mdp);
 
-		tst->ss->getinfo_super(tst, &mdi, NULL);
-		if (mdi.journal_device_required == 0) {
-			pr_err("%s does not support journal device.\n", devname);
-			return -1;
-		}
 		disc.raid_disk = 0;
 	}
 
diff --git a/mdadm.8.in b/mdadm.8.in
index ecfe9da..461c5de 100644
--- a/mdadm.8.in
+++ b/mdadm.8.in
@@ -1526,9 +1526,8 @@ the device is found or <slot>:missing in case the device is not found.
 
 .TP
 .BR \-\-add-journal
-Recreate journal for RAID-4/5/6 array that lost a journal device. In the
-current implementation, this command cannot add a journal to an array
-that had a failed journal. To avoid interrupting on-going write opertions,
+Add journal to an existing array, or recreate journal for RAID-4/5/6 array
+that lost a journal device. To avoid interrupting on-going write opertions,
 .B \-\-add-journal
 only works for array in Read-Only state.
 
-- 
2.7.4