raid5-ppl: check recovery_offset when performing ppl recovery

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@intel.com>
Signed-off-by: Shaohua Li <shli@fb.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c
index 76d6245427b8..628c0bf7b9fd 100644
--- a/drivers/md/raid5-ppl.c
+++ b/drivers/md/raid5-ppl.c
@@ -758,7 +758,8 @@ static int ppl_recover_entry(struct ppl_log *log, struct ppl_header_entry *e,
                                  (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;