diff options
| author | Coly Li <colyli@suse.de> | 2020-01-24 01:01:36 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-01-23 11:40:02 -0700 |
| commit | 7a0bc2a8966040d54289b64842d55e2cf4343ad9 (patch) | |
| tree | 335808680806e905557201c23c021dc5e47303d9 /drivers/md/bcache | |
| parent | 0e0c12316d8a645e7b1880e135837ee78d18aed9 (diff) | |
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>
Diffstat (limited to 'drivers/md/bcache')
| -rw-r--r-- | drivers/md/bcache/bset.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index cffcdc9feefb..4385303836d8 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -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; |