raid5-cache: use a mempool for the metadata block (e8deb638) · Commits · 戴 / test

drivers/md/raid5-cache.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -77,6 +77,7 @@ struct r5l_log {

		struct kmem_cache *io_kc;
		struct bio_set *bs;
		mempool_t *meta_pool;

		struct md_thread *reclaim_thread;
		unsigned long reclaim_target; /* number of space that need to be
		@@ -216,7 +217,7 @@ static void r5l_log_endio(struct bio *bio)
		md_error(log->rdev->mddev, log->rdev);

		bio_put(bio);
		__free_page(io->meta_page);
		mempool_free(io->meta_page, log->meta_pool);

		spin_lock_irqsave(&log->io_list_lock, flags);
		__r5l_set_io_unit_state(io, IO_UNIT_IO_END);
		@@ -293,8 +294,9 @@ static struct r5l_io_unit r5l_new_meta(struct r5l_log log)
		INIT_LIST_HEAD(&io->stripe_list);
		io->state = IO_UNIT_RUNNING;

		io->meta_page = alloc_page(GFP_NOIO \| __GFP_NOFAIL \| __GFP_ZERO);
		io->meta_page = mempool_alloc(log->meta_pool, GFP_NOIO);
		block = page_address(io->meta_page);
		clear_page(block);
		block->magic = cpu_to_le32(R5LOG_MAGIC);
		block->version = R5LOG_VERSION;
		block->seq = cpu_to_le64(log->seq);
		@@ -1172,6 +1174,10 @@ int r5l_init_log(struct r5conf conf, struct md_rdev rdev)
		if (!log->bs)
		goto io_bs;

		log->meta_pool = mempool_create_page_pool(R5L_POOL_SIZE, 0);
		if (!log->meta_pool)
		goto out_mempool;

		log->reclaim_thread = md_register_thread(r5l_reclaim_thread,
		log->rdev->mddev, "reclaim");
		if (!log->reclaim_thread)
		@@ -1186,9 +1192,12 @@ int r5l_init_log(struct r5conf conf, struct md_rdev rdev)

		rcu_assign_pointer(conf->log, log);
		return 0;

		error:
		md_unregister_thread(&log->reclaim_thread);
		reclaim_thread:
		mempool_destroy(log->meta_pool);
		out_mempool:
		bioset_free(log->bs);
		io_bs:
		kmem_cache_destroy(log->io_kc);
		@@ -1200,6 +1209,7 @@ io_kc:
		void r5l_exit_log(struct r5l_log *log)
		{
		md_unregister_thread(&log->reclaim_thread);
		mempool_destroy(log->meta_pool);
		bioset_free(log->bs);
		kmem_cache_destroy(log->io_kc);
		kfree(log);

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