linux-kernel - [PATCH 4.14 160/178] raid5-ppl: check recovery

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Date:   Mon, 18 Dec 2017 16:49:56 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
        Shaohua Li <shli@...com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 160/178] raid5-ppl: check recovery_offset when performing ppl recovery

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Artur Paszkiewicz <artur.paszkiewicz@...el.com>


[ Upstream commit 07719ff767dcd8cc42050f185d332052f3816546 ]

If starting an array that is undergoing rebuild, make ppl recovery honor
the recovery_offset of a member disk and don't read data that is not yet
in-sync.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@...el.com>
Signed-off-by: Shaohua Li <shli@...com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/raid5-ppl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/md/raid5-ppl.c
+++ b/drivers/md/raid5-ppl.c
@@ -758,7 +758,8 @@ static int ppl_recover_entry(struct ppl_
 				 (unsigned long long)sector);
 
 			rdev = conf->disks[dd_idx].rdev;
-			if (!rdev) {
+			if (!rdev || (!test_bit(In_sync, &rdev->flags) &&
+				      sector >= rdev->recovery_offset)) {
 				pr_debug("%s:%*s data member disk %d missing\n",
 					 __func__, indent, "", dd_idx);
 				update_parity = false;