[PATCH 5.2 146/162] mm/z3fold.c: fix race between migration and destruction

Greg Kroah-Hartman
2019-08-27T08:06:38Z

From: Henry Burns <henryburns@google.com>

commit d776aaa9895eb6eb770908e899cb7f5bd5025b3c upstream.

In z3fold_destroy_pool() we call destroy_workqueue(&pool->compact_wq).
However, we have no guarantee that migration isn't happening in the
background at that time.

Migration directly calls queue_work_on(pool->compact_wq), if destruction
wins that race we are using a destroyed workqueue.

Link: http://lkml.kernel.org/r/20190809213828.202833-1-henryburns@google.com
Signed-off-by: Henry Burns <henryburns@google.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: Henry Burns <henrywolfeburns@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
mm/z3fold.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)

--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -41,6 +41,7 @@
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/wait.h>
#include <linux/zpool.h>

/*
@@ -144,6 +145,8 @@ struct z3fold_header {
* @release_wq: workqueue for safe page release
* @work: work_struct for safe page release
* @inode: inode for z3fold pseudo filesystem
+ * @destroying: bool to stop migration once we start destruction
+ * @isolated: int to count the number of pages currently in isolation
*
* This structure is allocated at pool creation time and maintains metadata
* pertaining to a particular z3fold pool.
@@ -162,8 +165,11 @@ struct z3fold_pool {
const struct zpool_ops *zpool_ops;
struct workqueue_struct *compact_wq;
struct workqueue_struct *release_wq;
+ struct wait_queue_head isolate_wait;
struct work_struct work;
struct inode *inode;
+ bool destroying;
+ int isolated;
};

/*
@@ -771,6 +777,7 @@ static struct z3fold_pool *z3fold_create
goto out_c;
spin_lock_init(&pool->lock);
spin_lock_init(&pool->stale_lock);
+ init_waitqueue_head(&pool->isolate_wait);
pool->unbuddied = __alloc_percpu(sizeof(struct list_head)*NCHUNKS, 2);
if (!pool->unbuddied)
goto out_pool;
@@ -810,6 +817,15 @@ out:
return NULL;
}

+static bool pool_isolated_are_drained(struct z3fold_pool *pool)
+{
+ bool ret;
+
+ spin_lock(&pool->lock);
+ ret = pool->isolated == 0;
+ spin_unlock(&pool->lock);
+ return ret;
+}
/**
* z3fold_destroy_pool() - destroys an existing z3fold pool
* @pool: the z3fold pool to be destroyed
@@ -819,6 +835,22 @@ out:
static void z3fold_destroy_pool(struct z3fold_pool *pool)
{
kmem_cache_destroy(pool->c_handle);
+ /*
+ * We set pool-> destroying under lock to ensure that
+ * z3fold_page_isolate() sees any changes to destroying. This way we
+ * avoid the need for any memory barriers.
+ */
+
+ spin_lock(&pool->lock);
+ pool->destroying = true;
+ spin_unlock(&pool->lock);
+
+ /*
+ * We need to ensure that no pages are being migrated while we destroy
+ * these workqueues, as migration can queue work on either of the
+ * workqueues.
+ */
+ wait_event(pool->isolate_wait, !pool_isolated_are_drained(pool));

/*
* We need to destroy pool->compact_wq before pool->release_wq,
@@ -1309,6 +1341,28 @@ static u64 z3fold_get_pool_size(struct z
return atomic64_read(&pool->pages_nr);
}

+/*
+ * z3fold_dec_isolated() expects to be called while pool->lock is held.
+ */
+static void z3fold_dec_isolated(struct z3fold_pool *pool)
+{
+ assert_spin_locked(&pool->lock);
+ VM_BUG_ON(pool->isolated <= 0);
+ pool->isolated--;
+
+ /*
+ * If we have no more isolated pages, we have to see if
+ * z3fold_destroy_pool() is waiting for a signal.
+ */
+ if (pool->isolated == 0 && waitqueue_active(&pool->isolate_wait))
+ wake_up_all(&pool->isolate_wait);
+}
+
+static void z3fold_inc_isolated(struct z3fold_pool *pool)
+{
+ pool->isolated++;
+}
+
static bool z3fold_page_isolate(struct page *page, isolate_mode_t mode)
{
struct z3fold_header *zhdr;
@@ -1335,6 +1389,33 @@ static bool z3fold_page_isolate(struct p
spin_lock(&pool->lock);
if (!list_empty(&page->lru))
list_del(&page->lru);
+ /*
+ * We need to check for destruction while holding pool->lock, as
+ * otherwise destruction could see 0 isolated pages, and
+ * proceed.
+ */
+ if (unlikely(pool->destroying)) {
+ spin_unlock(&pool->lock);
+ /*
+ * If this page isn't stale, somebody else holds a
+ * reference to it. Let't drop our refcount so that they
+ * can call the release logic.
+ */
+ if (unlikely(kref_put(&zhdr->refcount,
+ release_z3fold_page_locked))) {
+ /*
+ * If we get here we have kref problems, so we
+ * should freak out.
+ */
+ WARN(1, "Z3fold is experiencing kref problems\n");
+ return false;
+ }
+ z3fold_page_unlock(zhdr);
+ return false;
+ }
+
+
+ z3fold_inc_isolated(pool);
spin_unlock(&pool->lock);
z3fold_page_unlock(zhdr);
return true;
@@ -1408,6 +1489,10 @@ static int z3fold_page_migrate(struct ad

queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work);

+ spin_lock(&pool->lock);
+ z3fold_dec_isolated(pool);
+ spin_unlock(&pool->lock);
+
page_mapcount_reset(page);
unlock_page(page);
put_page(page);
@@ -1428,10 +1513,14 @@ static void z3fold_page_putback(struct p
INIT_LIST_HEAD(&page->lru);
if (kref_put(&zhdr->refcount, release_z3fold_page_locked)) {
atomic64_dec(&pool->pages_nr);
+ spin_lock(&pool->lock);
+ z3fold_dec_isolated(pool);
+ spin_unlock(&pool->lock);
return;
}
spin_lock(&pool->lock);
list_add(&page->lru, &pool->lru);
+ z3fold_dec_isolated(pool);
spin_unlock(&pool->lock);
z3fold_page_unlock(zhdr);
}