md/raid10: don't clear bitmap during recovery if array will still be degraded.

commit 18055569127253755d01733f6ecc004ed02f88d0 upstream.

If we have a raid10 with multiple missing devices, and we recover just
one of these to a spare, then we risk (depending on the bitmap and
array chunk size) clearing bits of the bitmap for which recovery isn't
complete (because a device is still missing).

This can lead to a subsequent "re-add" being recovered without
any IO happening, which would result in loss of data.

This patch takes the safe approach of not clearing bitmap bits
if the array will still be degraded.

This patch is suitable for all active -stable kernels.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 7301631abe0453a4791dec55ba0eff84912876c3..d8495337dddf4e91a5a2e2d2aba7b799d69acb4a 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1807,17 +1807,17 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                                r10_bio->sector = sect;
 
                                raid10_find_phys(conf, r10_bio);
-                               /* Need to check if this section will still be
+
+                               /* Need to check if the array will still be
                                 * degraded
                                 */
-                               for (j=0; j<conf->copies;j++) {
-                                       int d = r10_bio->devs[j].devnum;
-                                       if (conf->mirrors[d].rdev == NULL ||
-                                           test_bit(Faulty, &conf->mirrors[d].rdev->flags)) {
+                               for (j=0; j<conf->raid_disks; j++)
+                                       if (conf->mirrors[j].rdev == NULL ||
+                                           test_bit(Faulty, &conf->mirrors[j].rdev->flags)) {
                                                still_degraded = 1;
                                                break;
                                        }
-                               }
+
                                must_sync = bitmap_start_sync(mddev->bitmap, sect,
                                                              &sync_blocks, still_degraded);