diff options
| author | Nigel Croxon <ncroxon@redhat.com> | 2019-04-16 09:50:09 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-25 18:22:31 +0200 |
| commit | bad4fbe76cfbf51ad8a712e74121b2778a9be4ef (patch) | |
| tree | b20eccfd3b1ef01df4e7b74e0f207befca206b3c | |
| parent | 3770eb3721be4a1a15a3b5c771e1a3147c21b2d8 (diff) | |
md/raid: raid5 preserve the writeback action after the parity check
commit b2176a1dfb518d870ee073445d27055fea64dfb8 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 5b68f2d0da60..f9c90ab220b9 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -4197,7 +4197,7 @@ 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++; @@ -4222,6 +4222,14 @@ 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); |