From bac624f3f86a8c7db395c7f85ccad6a504b9c4b4 Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@fb.com>
Date: Thu, 13 Aug 2015 14:31:55 -0700
Subject: MD: add a new disk role to present write journal device

Next patches will use a disk as raid5/6 journaling. We need a new disk
role to present the journal device and add MD_FEATURE_JOURNAL to
feature_map for backward compability.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
---
 drivers/md/md.c | 23 +++++++++++++++++++++--
 drivers/md/md.h |  5 +++++
 2 files changed, 26 insertions(+), 2 deletions(-)

(limited to 'drivers/md')

diff --git a/drivers/md/md.c b/drivers/md/md.c
index cfe5c8704a26..391341a772c7 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1638,6 +1638,15 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 		case MD_DISK_ROLE_FAULTY: /* faulty */
 			set_bit(Faulty, &rdev->flags);
 			break;
+		case MD_DISK_ROLE_JOURNAL: /* journal device */
+			if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) {
+				/* journal device without journal feature */
+				printk(KERN_WARNING
+				  "md: journal device provided without journal feature, ignoring the device\n");
+				return -EINVAL;
+			}
+			set_bit(Journal, &rdev->flags);
+			break;
 		default:
 			rdev->saved_raid_disk = role;
 			if ((le32_to_cpu(sb->feature_map) &
@@ -1796,7 +1805,10 @@ retry:
 			sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY);
 		else if (test_bit(In_sync, &rdev2->flags))
 			sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
-		else if (rdev2->raid_disk >= 0)
+		else if (test_bit(Journal, &rdev2->flags)) {
+			sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL);
+			sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL);
+		} else if (rdev2->raid_disk >= 0)
 			sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
 		else
 			sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE);
@@ -5840,7 +5852,8 @@ static int get_disk_info(struct mddev *mddev, void __user * arg)
 		else if (test_bit(In_sync, &rdev->flags)) {
 			info.state |= (1<<MD_DISK_ACTIVE);
 			info.state |= (1<<MD_DISK_SYNC);
-		}
+		} else if (test_bit(Journal, &rdev->flags))
+			info.state |= (1<<MD_DISK_JOURNAL);
 		if (test_bit(WriteMostly, &rdev->flags))
 			info.state |= (1<<MD_DISK_WRITEMOSTLY);
 	} else {
@@ -5955,6 +5968,8 @@ static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info)
 		else
 			clear_bit(WriteMostly, &rdev->flags);
 
+		if (info->state & (1<<MD_DISK_JOURNAL))
+			set_bit(Journal, &rdev->flags);
 		/*
 		 * check whether the device shows up in other nodes
 		 */
@@ -7330,6 +7345,10 @@ static int md_seq_show(struct seq_file *seq, void *v)
 				seq_printf(seq, "(F)");
 				continue;
 			}
+			if (test_bit(Journal, &rdev->flags)) {
+				seq_printf(seq, "(J)");
+				continue;
+			}
 			if (rdev->raid_disk < 0)
 				seq_printf(seq, "(S)"); /* spare */
 			if (test_bit(Replacement, &rdev->flags))
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 2ea00356bb23..88dc6312f5d5 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -172,6 +172,11 @@ enum flag_bits {
 				 * This device is seen locally but not
 				 * by the whole cluster
 				 */
+	Journal,		/* This device is used as journal for
+				 * raid-5/6.
+				 * Usually, this device should be faster
+				 * than other devices in the array
+				 */
 };
 
 #define BB_LEN_MASK	(0x00000000000001FFULL)
-- 
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