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Commit e8deb638 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by NeilBrown
Browse files

raid5-cache: use a mempool for the metadata block 



We only have a limited number in flight, so use a page based mempool.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
parent c38d29b3

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 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) 
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);