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bcache: fix for gc and writeback race

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Garbage collector needs to check keys in the writeback keybuf to
make sure it's not invalidating buckets to which the writeback
keys point to.

Signed-off-by: Nicholas Swenson <nks@daterainc.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Nicholas Swenson 2013-11-26 19:14:23 -08:00 • committed by Kent Overstreet
parent 981aa8c091
commit bf0a628a95
1 changed files with 22 additions and 0 deletions
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22
drivers/md/bcache/btree.c
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@ -1561,6 +1561,28 @@ size_t bch_btree_gc_finish(struct cache_set *c)
SET_GC_MARK(PTR_BUCKET(c, &c->uuid_bucket, i),
GC_MARK_METADATA);
/* don't reclaim buckets to which writeback keys point */
rcu_read_lock();
for (i = 0; i < c->nr_uuids; i++) {
struct bcache_device *d = c->devices[i];
struct cached_dev *dc;
struct keybuf_key *w, *n;
unsigned j;
if (!d || UUID_FLASH_ONLY(&c->uuids[i]))
continue;
dc = container_of(d, struct cached_dev, disk);
spin_lock(&dc->writeback_keys.lock);
rbtree_postorder_for_each_entry_safe(w, n,
&dc->writeback_keys.keys, node)
for (j = 0; j < KEY_PTRS(&w->key); j++)
SET_GC_MARK(PTR_BUCKET(c, &w->key, j),
GC_MARK_DIRTY);
spin_unlock(&dc->writeback_keys.lock);
}
rcu_read_unlock();
for_each_cache(ca, c, i) {
uint64_t *i;