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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 <hch@lst.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2016-10-20 15:12:13 +02:00
committed by Jens Axboe
parent 8d2bbd4c82
commit e806402130
38 changed files with 242 additions and 218 deletions
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4
block/blk-map.c
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@@ -135,7 +135,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
} while (iov_iter_count(&i));
if (!bio_flagged(bio, BIO_USER_MAPPED))
rq->cmd_flags |= REQ_COPY_USER;
rq->rq_flags |= RQF_COPY_USER;
return 0;
unmap_rq:
@@ -232,7 +232,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
if (do_copy)
rq->cmd_flags |= REQ_COPY_USER;
rq->rq_flags |= RQF_COPY_USER;
ret = blk_rq_append_bio(rq, bio);
if (unlikely(ret)) {