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block: add REQ_OP definitions and helpers

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The following patches separate the operation (WRITE, READ, DISCARD,
etc) from the rq_flag_bits flags. This patch adds definitions for
request/bio operations (REQ_OPs) and adds request/bio accessors to
get/set the op.

In this patch the REQ_OPs match the REQ rq_flag_bits ones
for compat reasons while all the code is converted to use the
op accessors in the set. In the last patches the op will become a
number and the accessors and helpers in this patch will be dropped
or updated.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Mike Christie
2016-06-05 14:31:42 -05:00
committed by Jens Axboe
parent 4e49ea4a3d
commit f21508211d
4 changed files with 60 additions and 3 deletions
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10
include/linux/blkdev.h
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@@ -200,6 +200,13 @@ struct request {
struct request *next_rq;
};
#define req_op(req) (op_from_rq_bits((req)->cmd_flags))
#define req_set_op(req, op) ((req)->cmd_flags |= op)
#define req_set_op_attrs(req, op, flags) do { \
req_set_op(req, op); \
(req)->cmd_flags |= flags; \
} while (0)
static inline unsigned short req_get_ioprio(struct request *req)
{
return req->ioprio;
@@ -597,7 +604,8 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
#define rq_data_dir(rq) ((int)((rq)->cmd_flags & 1))
#define rq_data_dir(rq) \
(op_is_write(op_from_rq_bits(rq->cmd_flags)) ? WRITE : READ)
/*
* Driver can handle struct request, if it either has an old style