Commit b2176a1d authored by Nigel Croxon's avatar Nigel Croxon Committed by Song Liu

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: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarNigel Croxon <ncroxon@redhat.com>
Signed-off-by: default avatarSong Liu <songliubraving@fb.com>
parent a25d8c32
...@@ -4191,7 +4191,7 @@ static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, ...@@ -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, /* now write out any block on a failed drive,
* or P or Q if they were recomputed * 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) { if (s->failed == 2) {
dev = &sh->dev[s->failed_num[1]]; dev = &sh->dev[s->failed_num[1]];
s->locked++; s->locked++;
...@@ -4216,6 +4216,14 @@ static void handle_parity_checks6(struct r5conf *conf, struct stripe_head *sh, ...@@ -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_LOCKED, &dev->flags);
set_bit(R5_Wantwrite, &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); clear_bit(STRIPE_DEGRADED, &sh->state);
set_bit(STRIPE_INSYNC, &sh->state); set_bit(STRIPE_INSYNC, &sh->state);
......
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