Read/write/flush are the most common operations, optimise switch in
blk_may_split() for these cases. All three added conditions are compiled
into a single comparison as the corresponding REQ_OP_* take 0-2.
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
block/blk.h | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/block/blk.h b/block/blk.h
index 6a039e6c7d07..0bf00e96e1f0 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -269,14 +269,18 @@ ssize_t part_timeout_store(struct device *, struct device_attribute *,
static inline bool blk_may_split(struct request_queue *q, struct bio *bio)
{
- switch (bio_op(bio)) {
- case REQ_OP_DISCARD:
- case REQ_OP_SECURE_ERASE:
- case REQ_OP_WRITE_ZEROES:
- case REQ_OP_WRITE_SAME:
- return true; /* non-trivial splitting decisions */
- default:
- break;
+ unsigned int op = bio_op(bio);
+
+ if (op != REQ_OP_READ && op != REQ_OP_WRITE && op != REQ_OP_FLUSH) {
+ switch (op) {
+ case REQ_OP_DISCARD:
+ case REQ_OP_SECURE_ERASE:
+ case REQ_OP_WRITE_ZEROES:
+ case REQ_OP_WRITE_SAME:
+ return true; /* non-trivial splitting decisions */
+ default:
+ break;
+ }
}
/*
--
2.33.1
