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| author | Kent Overstreet <kmo@daterainc.com> | 2014-03-13 13:46:29 -0700 |
|---|---|---|
| committer | Kent Overstreet <kmo@daterainc.com> | 2014-03-18 12:22:36 -0700 |
| commit | 4fe6a816707aace9e8e297b708411c5930537793 (patch) | |
| tree | 1316f5df799ba13ca96adcf47d87656fdebf394d /drivers/md/bcache/btree.c | |
| parent | c13f3af9247db929fe1be86c0442ef161e615ac4 (diff) | |
| download | talos-obmc-linux-4fe6a816707aace9e8e297b708411c5930537793.tar.gz talos-obmc-linux-4fe6a816707aace9e8e297b708411c5930537793.zip | |
bcache: Add a real GC_MARK_RECLAIMABLE
This means the garbage collection code can better check for data and metadata
pointers to the same buckets.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Diffstat (limited to 'drivers/md/bcache/btree.c')
| -rw-r--r-- | drivers/md/bcache/btree.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index ea5a59e2d740..1672db348c8b 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -1160,6 +1160,8 @@ static uint8_t __bch_btree_mark_key(struct cache_set *c, int level, SET_GC_MARK(g, GC_MARK_METADATA); else if (KEY_DIRTY(k)) SET_GC_MARK(g, GC_MARK_DIRTY); + else if (!GC_MARK(g)) + SET_GC_MARK(g, GC_MARK_RECLAIMABLE); /* guard against overflow */ SET_GC_SECTORS_USED(g, min_t(unsigned, @@ -1559,7 +1561,7 @@ static void btree_gc_start(struct cache_set *c) for_each_bucket(b, ca) { b->gc_gen = b->gen; if (!atomic_read(&b->pin)) { - SET_GC_MARK(b, GC_MARK_RECLAIMABLE); + SET_GC_MARK(b, 0); SET_GC_SECTORS_USED(b, 0); } } @@ -1622,12 +1624,16 @@ size_t bch_btree_gc_finish(struct cache_set *c) b->last_gc = b->gc_gen; c->need_gc = max(c->need_gc, bucket_gc_gen(b)); - if (!atomic_read(&b->pin) && - GC_MARK(b) == GC_MARK_RECLAIMABLE) { + if (atomic_read(&b->pin)) + continue; + + BUG_ON(!GC_MARK(b) && GC_SECTORS_USED(b)); + + if (!GC_MARK(b) || GC_MARK(b) == GC_MARK_RECLAIMABLE) available++; - if (!GC_SECTORS_USED(b)) - bch_bucket_add_unused(ca, b); - } + + if (!GC_MARK(b)) + bch_bucket_add_unused(ca, b); } } |
