4.20-stable review patch. If anyone has any objections, please let me know.
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From: Nate Dailey nate.dailey@stratus.com
commit dfcc34c99f3ebc16b787b118763bf9cb6b1efc7a upstream.
sync_request_write no longer submits writes to a Faulty device. This has the unfortunate side effect that bitmap bits can be incorrectly cleared if a recovery is interrupted (previously, end_sync_write would have prevented this). This means the next recovery may not copy everything it should, potentially corrupting data.
Add a function for doing the proper md_bitmap_end_sync, called from end_sync_write and the Faulty case in sync_request_write.
backport note to 4.14: s/md_bitmap_end_sync/bitmap_end_sync Cc: stable@vger.kernel.org 4.14+ Fixes: 0c9d5b127f69 ("md/raid1: avoid reusing a resync bio after error handling.") Reviewed-by: Jack Wang jinpu.wang@cloud.ionos.com Tested-by: Jack Wang jinpu.wang@cloud.ionos.com Signed-off-by: Nate Dailey nate.dailey@stratus.com Signed-off-by: Song Liu songliubraving@fb.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/raid1.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-)
--- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1863,6 +1863,20 @@ static void end_sync_read(struct bio *bi reschedule_retry(r1_bio); }
+static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) +{ + sector_t sync_blocks = 0; + sector_t s = r1_bio->sector; + long sectors_to_go = r1_bio->sectors; + + /* make sure these bits don't get cleared. */ + do { + md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); + s += sync_blocks; + sectors_to_go -= sync_blocks; + } while (sectors_to_go > 0); +} + static void end_sync_write(struct bio *bio) { int uptodate = !bio->bi_status; @@ -1874,15 +1888,7 @@ static void end_sync_write(struct bio *b struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev;
if (!uptodate) { - sector_t sync_blocks = 0; - sector_t s = r1_bio->sector; - long sectors_to_go = r1_bio->sectors; - /* make sure these bits doesn't get cleared. */ - do { - md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); - s += sync_blocks; - sectors_to_go -= sync_blocks; - } while (sectors_to_go > 0); + abort_sync_write(mddev, r1_bio); set_bit(WriteErrorSeen, &rdev->flags); if (!test_and_set_bit(WantReplacement, &rdev->flags)) set_bit(MD_RECOVERY_NEEDED, & @@ -2172,8 +2178,10 @@ static void sync_request_write(struct md (i == r1_bio->read_disk || !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) continue; - if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) + if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { + abort_sync_write(mddev, r1_bio); continue; + }
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); if (test_bit(FailFast, &conf->mirrors[i].rdev->flags))