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bcache: Fix GC_SECTORS_USED() calculation

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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
This commit is contained in:
Kent Overstreet 2013-07-11 19:43:21 -07:00
parent faa5673617
commit 29ebf465b9
1 changed files with 3 additions and 1 deletions
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4
drivers/md/bcache/btree.c
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@ -1410,8 +1410,10 @@ static void btree_gc_start(struct cache_set *c)
for_each_cache(ca, c, i)
for_each_bucket(b, ca) {
b->gc_gen = b->gen;
if (!atomic_read(&b->pin))
if (!atomic_read(&b->pin)) {
SET_GC_MARK(b, GC_MARK_RECLAIMABLE);
SET_GC_SECTORS_USED(b, 0);
}
}
mutex_unlock(&c->bucket_lock);