Commit 7a0bc2a8 authored by Coly Li's avatar Coly Li Committed by Jens Axboe
Browse files

bcache: add code comments for state->pool in __btree_sort() 



To explain the pages allocated from mempool state->pool can be
swapped in __btree_sort(), because state->pool is a page pool,
which allocates pages by alloc_pages() indeed.

Signed-off-by: default avatarColy Li <colyli@suse.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 0e0c1231

drivers/md/bcache/bset.c

+5 −0
Original line number Diff line number Diff line
@@ -1257,6 +1257,11 @@ static void __btree_sort(struct btree_keys *b, struct btree_iter *iter, 
		 * Our temporary buffer is the same size as the btree node's

		 * buffer, we can just swap buffers instead of doing a big

		 * memcpy()

		 *

		 * Don't worry event 'out' is allocated from mempool, it can

		 * still be swapped here. Because state->pool is a page mempool

		 * creaated by by mempool_init_page_pool(), which allocates

		 * pages by alloc_pages() indeed.

		 */



		out->magic	= b->set->data->magic;

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