* [PATCH AUTOSEL 4.14 2/7] bcache: add code comments for bch_btree_node_get() and __bch_btree_node_alloc()
[not found] <20231128211018.877548-1-sashal@kernel.org>
@ 2023-11-28 21:10 ` Sasha Levin
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From: Sasha Levin @ 2023-11-28 21:10 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Coly Li, Jens Axboe, Sasha Levin, kent.overstreet, linux-bcache
From: Coly Li <colyli@suse.de>
[ Upstream commit 31f5b956a197d4ec25c8a07cb3a2ab69d0c0b82f ]
This patch adds code comments to bch_btree_node_get() and
__bch_btree_node_alloc() that NULL pointer will not be returned and it
is unnecessary to check NULL pointer by the callers of these routines.
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20231120052503.6122-10-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/md/bcache/btree.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index fba0fff8040d6..6312b01829204 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -972,6 +972,9 @@ static struct btree *mca_alloc(struct cache_set *c, struct btree_op *op,
*
* The btree node will have either a read or a write lock held, depending on
* level and op->lock.
+ *
+ * Note: Only error code or btree pointer will be returned, it is unncessary
+ * for callers to check NULL pointer.
*/
struct btree *bch_btree_node_get(struct cache_set *c, struct btree_op *op,
struct bkey *k, int level, bool write,
@@ -1070,6 +1073,10 @@ static void btree_node_free(struct btree *b)
mutex_unlock(&b->c->bucket_lock);
}
+/*
+ * Only error code or btree pointer will be returned, it is unncessary for
+ * callers to check NULL pointer.
+ */
struct btree *__bch_btree_node_alloc(struct cache_set *c, struct btree_op *op,
int level, bool wait,
struct btree *parent)
--
2.42.0
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