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| author | NeilBrown <neilb@suse.de> | 2012-10-11 13:50:13 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-10-11 13:50:13 +1100 |
| commit | 1ed850f356a0a422013846b5291acff08815008b (patch) | |
| tree | 9dd66a6b204a385574b7a885b6415e58f26a6780 | |
| parent | a7854487cd7128a30a7f4f5259de9f67d5efb95f (diff) | |
| download | linux-1ed850f356a0a422013846b5291acff08815008b.tar.gz | |
md/raid5: make sure to_read and to_write never go negative.
to_read and to_write are part of the result of analysing a stripe before handling it. Their use is to avoid some loops and tests if the values are known to be zero. Thus it is not a problem if they are a little bit larger than they should be. So decrementing them in handle_failed_stripe serves little value, and due to races it could cause some loops to be skipped incorrectly. So remove those decrements. Reported-by: "Jianpeng Ma" <majianpeng@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/raid5.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 9de8221f64ec..ab613efbbead 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2507,10 +2507,8 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, bi = sh->dev[i].towrite; sh->dev[i].towrite = NULL; spin_unlock_irq(&sh->stripe_lock); - if (bi) { - s->to_write--; + if (bi) bitmap_end = 1; - } if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) wake_up(&conf->wait_for_overlap); @@ -2558,7 +2556,6 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh, spin_unlock_irq(&sh->stripe_lock); if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) wake_up(&conf->wait_for_overlap); - if (bi) s->to_read--; while (bi && bi->bi_sector < sh->dev[i].sector + STRIPE_SECTORS) { struct bio *nextbi = |