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md/raid5-cache: stripe reclaim only counts valid stripes 

When log space is tight, we try to reclaim stripes from log head. There
are stripes which can't be reclaimed right now if some conditions are
met. We skip such stripes but accidentally count them, which might cause
no stripes are claimed. Fixing this by only counting valid stripes.

Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li 2017-02-10 16:18:08 -08:00
parent 5a6265f9cd
commit e8fd52eec2
1 changed files with 2 additions and 2 deletions
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4
drivers/md/raid5-cache.c
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@ -1418,9 +1418,9 @@ static void r5c_do_reclaim(struct r5conf *conf)
!test_bit(STRIPE_HANDLE, &sh->state) &&
atomic_read(&sh->count) == 0) {
r5c_flush_stripe(conf, sh);
if (count++ >= R5C_RECLAIM_STRIPE_GROUP)
break;
}
if (count++ >= R5C_RECLAIM_STRIPE_GROUP)
break;
}
spin_unlock(&conf->device_lock);
spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags);