[3.13.y.z,extended,stable] Patch "aio: v4 ensure access to ctx->ring_pages is correctly serialised for migration" has been added to staging queue

diff --git a/fs/aio.c b/fs/aio.c
index 062a5f6..12a3de0e 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -52,7 +52,8 @@ 
 struct aio_ring {
 	unsigned	id;	/* kernel internal index number */
 	unsigned	nr;	/* number of io_events */
-	unsigned	head;
+	unsigned	head;	/* Written to by userland or under ring_lock
+				 * mutex by aio_read_events_ring(). */
 	unsigned	tail;

 	unsigned	magic;
@@ -243,6 +244,11 @@  static void aio_free_ring(struct kioctx *ctx)
 {
 	int i;

+	/* Disconnect the kiotx from the ring file.  This prevents future
+	 * accesses to the kioctx from page migration.
+	 */
+	put_aio_ring_file(ctx);
+
 	for (i = 0; i < ctx->nr_pages; i++) {
 		struct page *page;
 		pr_debug("pid(%d) [%d] page->count=%d\n", current->pid, i,
@@ -254,8 +260,6 @@  static void aio_free_ring(struct kioctx *ctx)
 		put_page(page);
 	}

-	put_aio_ring_file(ctx);
-
 	if (ctx->ring_pages && ctx->ring_pages != ctx->internal_pages) {
 		kfree(ctx->ring_pages);
 		ctx->ring_pages = NULL;
@@ -283,29 +287,38 @@  static int aio_migratepage(struct address_space *mapping, struct page *new,
 {
 	struct kioctx *ctx;
 	unsigned long flags;
+	pgoff_t idx;
 	int rc;

 	rc = 0;

-	/* Make sure the old page hasn't already been changed */
+	/* mapping->private_lock here protects against the kioctx teardown.  */
 	spin_lock(&mapping->private_lock);
 	ctx = mapping->private_data;
-	if (ctx) {
-		pgoff_t idx;
-		spin_lock_irqsave(&ctx->completion_lock, flags);
-		idx = old->index;
-		if (idx < (pgoff_t)ctx->nr_pages) {
-			if (ctx->ring_pages[idx] != old)
-				rc = -EAGAIN;
-		} else
-			rc = -EINVAL;
-		spin_unlock_irqrestore(&ctx->completion_lock, flags);
+	if (!ctx) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* The ring_lock mutex.  The prevents aio_read_events() from writing
+	 * to the ring's head, and prevents page migration from mucking in
+	 * a partially initialized kiotx.
+	 */
+	if (!mutex_trylock(&ctx->ring_lock)) {
+		rc = -EAGAIN;
+		goto out;
+	}
+
+	idx = old->index;
+	if (idx < (pgoff_t)ctx->nr_pages) {
+		/* Make sure the old page hasn't already been changed */
+		if (ctx->ring_pages[idx] != old)
+			rc = -EAGAIN;
 	} else
 		rc = -EINVAL;
-	spin_unlock(&mapping->private_lock);

 	if (rc != 0)
-		return rc;
+		goto out_unlock;

 	/* Writeback must be complete */
 	BUG_ON(PageWriteback(old));
@@ -314,38 +327,26 @@  static int aio_migratepage(struct address_space *mapping, struct page *new,
 	rc = migrate_page_move_mapping(mapping, new, old, NULL, mode, 1);
 	if (rc != MIGRATEPAGE_SUCCESS) {
 		put_page(new);
-		return rc;
+		goto out_unlock;
 	}

-	/* We can potentially race against kioctx teardown here.  Use the
-	 * address_space's private data lock to protect the mapping's
-	 * private_data.
+	/* Take completion_lock to prevent other writes to the ring buffer
+	 * while the old page is copied to the new.  This prevents new
+	 * events from being lost.
 	 */
-	spin_lock(&mapping->private_lock);
-	ctx = mapping->private_data;
-	if (ctx) {
-		pgoff_t idx;
-		spin_lock_irqsave(&ctx->completion_lock, flags);
-		migrate_page_copy(new, old);
-		idx = old->index;
-		if (idx < (pgoff_t)ctx->nr_pages) {
-			/* And only do the move if things haven't changed */
-			if (ctx->ring_pages[idx] == old)
-				ctx->ring_pages[idx] = new;
-			else
-				rc = -EAGAIN;
-		} else
-			rc = -EINVAL;
-		spin_unlock_irqrestore(&ctx->completion_lock, flags);
-	} else
-		rc = -EBUSY;
-	spin_unlock(&mapping->private_lock);
+	spin_lock_irqsave(&ctx->completion_lock, flags);
+	migrate_page_copy(new, old);
+	BUG_ON(ctx->ring_pages[idx] != old);
+	ctx->ring_pages[idx] = new;
+	spin_unlock_irqrestore(&ctx->completion_lock, flags);

-	if (rc == MIGRATEPAGE_SUCCESS)
-		put_page(old);
-	else
-		put_page(new);
+	/* The old page is no longer accessible. */
+	put_page(old);

+out_unlock:
+	mutex_unlock(&ctx->ring_lock);
+out:
+	spin_unlock(&mapping->private_lock);
 	return rc;
 }
 #endif
@@ -380,7 +381,7 @@  static int aio_setup_ring(struct kioctx *ctx)
 	file = aio_private_file(ctx, nr_pages);
 	if (IS_ERR(file)) {
 		ctx->aio_ring_file = NULL;
-		return -EAGAIN;
+		return -ENOMEM;
 	}

 	ctx->aio_ring_file = file;
@@ -415,7 +416,7 @@  static int aio_setup_ring(struct kioctx *ctx)

 	if (unlikely(i != nr_pages)) {
 		aio_free_ring(ctx);
-		return -EAGAIN;
+		return -ENOMEM;
 	}

 	ctx->mmap_size = nr_pages * PAGE_SIZE;
@@ -429,7 +430,7 @@  static int aio_setup_ring(struct kioctx *ctx)
 	if (IS_ERR((void *)ctx->mmap_base)) {
 		ctx->mmap_size = 0;
 		aio_free_ring(ctx);
-		return -EAGAIN;
+		return -ENOMEM;
 	}

 	pr_debug("mmap address: 0x%08lx\n", ctx->mmap_base);
@@ -556,6 +557,10 @@  static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
 					rcu_read_unlock();
 					spin_unlock(&mm->ioctx_lock);

+					/* While kioctx setup is in progress,
+					 * we are protected from page migration
+					 * changes ring_pages by ->ring_lock.
+					 */
 					ring = kmap_atomic(ctx->ring_pages[0]);
 					ring->id = ctx->id;
 					kunmap_atomic(ring);
@@ -640,24 +645,28 @@  static struct kioctx *ioctx_alloc(unsigned nr_events)

 	ctx->max_reqs = nr_events;

-	if (percpu_ref_init(&ctx->users, free_ioctx_users))
-		goto err;
-
-	if (percpu_ref_init(&ctx->reqs, free_ioctx_reqs))
-		goto err;
-
 	spin_lock_init(&ctx->ctx_lock);
 	spin_lock_init(&ctx->completion_lock);
 	mutex_init(&ctx->ring_lock);
+	/* Protect against page migration throughout kiotx setup by keeping
+	 * the ring_lock mutex held until setup is complete. */
+	mutex_lock(&ctx->ring_lock);
 	init_waitqueue_head(&ctx->wait);

 	INIT_LIST_HEAD(&ctx->active_reqs);

+	if (percpu_ref_init(&ctx->users, free_ioctx_users))
+		goto err;
+
+	if (percpu_ref_init(&ctx->reqs, free_ioctx_reqs))
+		goto err;
+
 	ctx->cpu = alloc_percpu(struct kioctx_cpu);
 	if (!ctx->cpu)
 		goto err;

-	if (aio_setup_ring(ctx) < 0)
+	err = aio_setup_ring(ctx);
+	if (err < 0)
 		goto err;

 	atomic_set(&ctx->reqs_available, ctx->nr_events - 1);
@@ -683,6 +692,9 @@  static struct kioctx *ioctx_alloc(unsigned nr_events)
 	if (err)
 		goto err_cleanup;

+	/* Release the ring_lock mutex now that all setup is complete. */
+	mutex_unlock(&ctx->ring_lock);
+
 	pr_debug("allocated ioctx %p[%ld]: mm=%p mask=0x%x\n",
 		 ctx, ctx->user_id, mm, ctx->nr_events);
 	return ctx;
@@ -692,6 +704,7 @@  err_cleanup:
 err_ctx:
 	aio_free_ring(ctx);
 err:
+	mutex_unlock(&ctx->ring_lock);
 	free_percpu(ctx->cpu);
 	free_percpu(ctx->reqs.pcpu_count);
 	free_percpu(ctx->users.pcpu_count);
@@ -1024,6 +1037,7 @@  static long aio_read_events_ring(struct kioctx *ctx,

 	mutex_lock(&ctx->ring_lock);

+	/* Access to ->ring_pages here is protected by ctx->ring_lock. */
 	ring = kmap_atomic(ctx->ring_pages[0]);
 	head = ring->head;
 	tail = ring->tail;