Messages in this thread Patch in this message | | | Date | Thu, 14 May 2009 15:51:29 -0700 | From | Greg KH <> | Subject | [patch 03/28] md/raid10: dont clear bitmap during recovery if array will still be degraded. |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: NeilBrown <neilb@suse.de>
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>
--- drivers/md/raid10.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1805,17 +1805,17 @@ static sector_t sync_request(mddev_t *md 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);
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