[PATCH 35/45] block: convert merge/insert code to check for REQ_OPs.

mchristi
2016-06-05T19:33:54Z

This patch converts the block layer merging code to use separate variables
for the operation and flags, and to check req_op for the REQ_OP.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
---
block/blk-core.c | 2 +-
block/blk-merge.c | 10 ++++++----
include/linux/blkdev.h | 20 ++++++++++----------
3 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 090e55d..1333bb7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2161,7 +2161,7 @@ EXPORT_SYMBOL(submit_bio);
static int blk_cloned_rq_check_limits(struct request_queue *q,
struct request *rq)
{
- if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, rq->cmd_flags)) {
+ if (blk_rq_sectors(rq) > blk_queue_get_max_sectors(q, req_op(rq))) {
printk(KERN_ERR "%s: over max size limit.\n", __func__);
return -EIO;
}
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 5a03f96..c265348 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -649,7 +649,8 @@ static int attempt_merge(struct request_queue *q, struct request *req,
if (!rq_mergeable(req) || !rq_mergeable(next))
return 0;

- if (!blk_check_merge_flags(req->cmd_flags, next->cmd_flags))
+ if (!blk_check_merge_flags(req->cmd_flags, req_op(req), next->cmd_flags,
+ req_op(next)))
return 0;

/*
@@ -663,7 +664,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
|| req_no_special_merge(next))
return 0;

- if (req->cmd_flags & REQ_WRITE_SAME &&
+ if (req_op(req) == REQ_OP_WRITE_SAME &&
!blk_write_same_mergeable(req->bio, next->bio))
return 0;

@@ -751,7 +752,8 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
if (!rq_mergeable(rq) || !bio_mergeable(bio))
return false;

- if (!blk_check_merge_flags(rq->cmd_flags, bio->bi_rw))
+ if (!blk_check_merge_flags(rq->cmd_flags, req_op(rq), bio->bi_rw,
+ bio_op(bio)))
return false;

/* different data direction or already started, don't merge */
@@ -767,7 +769,7 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
return false;

/* must be using the same buffer */
- if (rq->cmd_flags & REQ_WRITE_SAME &&
+ if (req_op(rq) == REQ_OP_WRITE_SAME &&
!blk_write_same_mergeable(rq->bio, bio))
return false;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8c78aca..25f01ff 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -666,16 +666,16 @@ static inline bool rq_mergeable(struct request *rq)
return true;
}

-static inline bool blk_check_merge_flags(unsigned int flags1,
- unsigned int flags2)
+static inline bool blk_check_merge_flags(unsigned int flags1, unsigned int op1,
+ unsigned int flags2, unsigned int op2)
{
- if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD))
+ if ((op1 == REQ_OP_DISCARD) != (op2 == REQ_OP_DISCARD))
return false;

if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE))
return false;

- if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME))
+ if ((op1 == REQ_OP_WRITE_SAME) != (op2 == REQ_OP_WRITE_SAME))
return false;

return true;
@@ -887,12 +887,12 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
}

static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
- unsigned int cmd_flags)
+ int op)
{
- if (unlikely(cmd_flags & REQ_DISCARD))
+ if (unlikely(op == REQ_OP_DISCARD))
return min(q->limits.max_discard_sectors, UINT_MAX >> 9);

- if (unlikely(cmd_flags & REQ_WRITE_SAME))
+ if (unlikely(op == REQ_OP_WRITE_SAME))
return q->limits.max_write_same_sectors;

return q->limits.max_sectors;
@@ -919,11 +919,11 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
if (unlikely(rq->cmd_type != REQ_TYPE_FS))
return q->limits.max_hw_sectors;

- if (!q->limits.chunk_sectors || (rq->cmd_flags & REQ_DISCARD))
- return blk_queue_get_max_sectors(q, rq->cmd_flags);
+ if (!q->limits.chunk_sectors || (req_op(rq) == REQ_OP_DISCARD))
+ return blk_queue_get_max_sectors(q, req_op(rq));

return min(blk_max_size_offset(q, blk_rq_pos(rq)),
- blk_queue_get_max_sectors(q, rq->cmd_flags));
+ blk_queue_get_max_sectors(q, req_op(rq)));
}

static inline unsigned int blk_rq_count_bios(struct request *rq)