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| author | Nigel Croxon <ncroxon@redhat.com> | 2019-04-16 09:50:09 -0700 |
|---|---|---|
| committer | Song Liu <songliubraving@fb.com> | 2019-04-16 14:33:18 -0700 |
| commit | b2176a1dfb518d870ee073445d27055fea64dfb8 (patch) | |
| tree | 0d95541e3b7f29186b6a837a7746a294c59f62bb | |
| parent | a25d8c327bb41742dbd59f8c545f59f3b9c39983 (diff) | |
| download | linux-b2176a1dfb518d870ee073445d27055fea64dfb8.tar.gz linux-b2176a1dfb518d870ee073445d27055fea64dfb8.tar.bz2 linux-b2176a1dfb518d870ee073445d27055fea64dfb8.zip | |
md/raid: raid5 preserve the writeback action after the parity check
The problem is that any 'uptodate' vs 'disks' check is not precise
in this path. Put a "WARN_ON(!test_bit(R5_UPTODATE, &dev->flags)" on the
device that might try to kick off writes and then skip the action.
Better to prevent the raid driver from taking unexpected action *and* keep
the system alive vs killing the machine with BUG_ON.
Note: fixed warning reported by kbuild test robot <lkp@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Nigel Croxon <ncroxon@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
| -rw-r--r-- | drivers/md/raid5.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index b5742d07662d..7fde645d2e90 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4191,7 +4191,7 @@ static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, /* now write out any block on a failed drive, * or P or Q if they were recomputed */ - BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ + dev = NULL; if (s->failed == 2) { dev = &sh->dev[s->failed_num[1]]; s->locked++; @@ -4216,6 +4216,14 @@ static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, set_bit(R5_LOCKED, &dev->flags); set_bit(R5_Wantwrite, &dev->flags); } + if (WARN_ONCE(dev && !test_bit(R5_UPTODATE, &dev->flags), + "%s: disk%td not up to date\n", + mdname(conf->mddev), + dev - (struct r5dev *) &sh->dev)) { + clear_bit(R5_LOCKED, &dev->flags); + clear_bit(R5_Wantwrite, &dev->flags); + s->locked--; + } clear_bit(STRIPE_DEGRADED, &sh->state); set_bit(STRIPE_INSYNC, &sh->state); |