Re: [PATCH v3 3/9] md: superblock changes for PPL

Include information about PPL location and size into mdp_superblock_1
and copy it to/from rdev. Because PPL is mutually exclusive with bitmap,
put it in place of 'bitmap_offset'. Add a new flag MD_FEATURE_PPL for
'feature_map', analogically to MD_FEATURE_BITMAP_OFFSET. Add MD_HAS_PPL
to mddev->flags to indicate that PPL is enabled on an array.

Signed-off-by: Artur Paszkiewicz <redacted>
---
 drivers/md/md.c                | 15 +++++++++++++++
 drivers/md/md.h                |  8 ++++++++
 drivers/md/raid0.c             |  3 ++-
 drivers/md/raid1.c             |  3 ++-
 include/uapi/linux/raid/md_p.h | 18 ++++++++++++++----
 5 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 85ac98417a08..e96f73572e23 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c

@@ -1566,6 +1566,12 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
 	} else if (sb->bblog_offset != 0)
 		rdev->badblocks.shift = 0;
 
+	if (le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) {
+		rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset);
+		rdev->ppl.size = le16_to_cpu(sb->ppl.size);
+		rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset;
+	}
+
 	if (!refdev) {
 		ret = 1;
 	} else {

@@ -1678,6 +1684,9 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
 
 		if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)
 			set_bit(MD_HAS_JOURNAL, &mddev->flags);
+
+		if (le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL)
+			set_bit(MD_HAS_PPL, &mddev->flags);