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block: split out request-only flags into a new namespace

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A lot of the REQ_* flags are only used on struct requests, and only of
use to the block layer and a few drivers that dig into struct request
internals.

This patch adds a new req_flags_t rq_flags field to struct request for
them, and thus dramatically shrinks the number of common requests.  It
also removes the unfortunate situation where we have to fit the fields
from the same enum into 32 bits for struct bio and 64 bits for
struct request.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Shaun Tancheff <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2016-10-20 15:12:13 +02:00 • committed by Jens Axboe
commit e806402130
38 changed files with 242 additions and 218 deletions
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4
block/blk.h
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@ -130,7 +130,7 @@ static inline void blk_clear_rq_complete(struct request *rq)
/*
* Internal elevator interface
*/
#define ELV_ON_HASH(rq) ((rq)->cmd_flags & REQ_HASHED)
#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
void blk_insert_flush(struct request *rq);
@ -247,7 +247,7 @@ extern int blk_update_nr_requests(struct request_queue *, unsigned int);
static inline int blk_do_io_stat(struct request *rq)
{
return rq->rq_disk &&
(rq->cmd_flags & REQ_IO_STAT) &&
(rq->rq_flags & RQF_IO_STAT) &&
(rq->cmd_type == REQ_TYPE_FS);
}