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authorColy Li <colyli@suse.de>2020-01-24 01:01:36 +0800
committerJens Axboe <axboe@kernel.dk>2020-01-23 11:40:02 -0700
commit7a0bc2a8966040d54289b64842d55e2cf4343ad9 (patch)
tree335808680806e905557201c23c021dc5e47303d9 /drivers/md
parent0e0c12316d8a645e7b1880e135837ee78d18aed9 (diff)
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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>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/bset.c5
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;