bcache: Fix GC_SECTORS_USED() calculation
Part of the job of garbage collection is to add up however many sectors of live data it finds in each bucket, but that doesn't work very well if it doesn't reset GC_SECTORS_USED() when it starts. Whoops. This wouldn't have broken anything horribly, but allocation tries to preferentially reclaim buckets that are mostly empty and that's not gonna work with an incorrect GC_SECTORS_USED() value. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
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@ -1410,8 +1410,10 @@ static void btree_gc_start(struct cache_set *c)
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for_each_cache(ca, c, i)
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for_each_bucket(b, ca) {
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b->gc_gen = b->gen;
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if (!atomic_read(&b->pin))
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if (!atomic_read(&b->pin)) {
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SET_GC_MARK(b, GC_MARK_RECLAIMABLE);
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SET_GC_SECTORS_USED(b, 0);
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}
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}
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mutex_unlock(&c->bucket_lock);
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