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md bugfixes for 3.17

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- raid6 data corruption during recovery
  - raid6 livelock
  - raid10 memory leaks.
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Merge tag 'md/3.17-fixes' of git://neil.brown.name/md

Pull md bugfixes from Neil Brown:
 "Here are the bug-fixes I promised :-)

  Funny how you start looking for one and other start appearing.

   - raid6 data corruption during recovery
   - raid6 livelock
   - raid10 memory leaks"

* tag 'md/3.17-fixes' of git://neil.brown.name/md:
  md/raid10: always initialise ->state on newly allocated r10_bio
  md/raid10: avoid memory leak on error path during reshape.
  md/raid10: Fix memory leak when raid10 reshape completes.
  md/raid10: fix memory leak when reshaping a RAID10.
  md/raid6: avoid data corruption during recovery of double-degraded RAID6
  md/raid5: avoid livelock caused by non-aligned writes.
This commit is contained in:
Linus Torvalds 2014-08-19 09:47:01 -05:00
commit 63d871cb0b
2 changed files with 9 additions and 2 deletions
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7
drivers/md/raid10.c
View File

@ -2953,6 +2953,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
*/
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
end_reshape(conf);
close_sync(conf);
return 0;
}
@ -3081,6 +3082,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
}
r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
r10_bio->state = 0;
raise_barrier(conf, rb2 != NULL);
atomic_set(&r10_bio->remaining, 0);
@ -3269,6 +3271,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
if (sync_blocks < max_sync)
max_sync = sync_blocks;
r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
r10_bio->state = 0;
r10_bio->mddev = mddev;
atomic_set(&r10_bio->remaining, 0);
@ -4384,6 +4387,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
read_more:
/* Now schedule reads for blocks from sector_nr to last */
r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO);
r10_bio->state = 0;
raise_barrier(conf, sectors_done != 0);
atomic_set(&r10_bio->remaining, 0);
r10_bio->mddev = mddev;
@ -4398,6 +4402,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
* on all the target devices.
*/
// FIXME
mempool_free(r10_bio, conf->r10buf_pool);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
return sectors_done;
}
@ -4410,7 +4415,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
read_bio->bi_private = r10_bio;
read_bio->bi_end_io = end_sync_read;
read_bio->bi_rw = READ;
read_bio->bi_flags &= ~(BIO_POOL_MASK - 1);
read_bio->bi_flags &= (~0UL << BIO_RESET_BITS);
read_bio->bi_flags |= 1 << BIO_UPTODATE;
read_bio->bi_vcnt = 0;
read_bio->bi_iter.bi_size = 0;

4
drivers/md/raid5.c
View File

@ -2922,7 +2922,7 @@ static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s,
(!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) &&
!test_bit(R5_OVERWRITE, &fdev[0]->flags)) ||
(sh->raid_conf->level == 6 && s->failed && s->to_write &&
s->to_write < sh->raid_conf->raid_disks - 2 &&
s->to_write - s->non_overwrite < sh->raid_conf->raid_disks - 2 &&
(!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))))) {
/* we would like to get this block, possibly by computing it,
* otherwise read it if the backing disk is insync
@ -3817,6 +3817,8 @@ static void handle_stripe(struct stripe_head *sh)
set_bit(R5_Wantwrite, &dev->flags);
if (prexor)
continue;
if (s.failed > 1)
continue;
if (!test_bit(R5_Insync, &dev->flags) ||
((i == sh->pd_idx || i == sh->qd_idx) &&
s.failed == 0))