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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: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2020-01-24 01:01:36 +08:00 committed by Jens Axboe
parent 0e0c12316d
commit 7a0bc2a896
1 changed files with 5 additions and 0 deletions
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5
drivers/md/bcache/bset.c
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@ -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 * Our temporary buffer is the same size as the btree node's
* buffer, we can just swap buffers instead of doing a big * buffer, we can just swap buffers instead of doing a big
* memcpy() * 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; out->magic = b->set->data->magic;