diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2012-09-18 20:19:25 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-09-20 16:31:38 +0400 |
| commit | e2a60da74fc8215c68509a89e9a69c66363153db (patch) | |
| tree | c23dd6540dc211e2b2583c3e950a7f6977e3f1df /block/blk-core.c | |
| parent | d41570b7469724005eb78448a69289900f911963 (diff) | |
| download | linux-e2a60da74fc8215c68509a89e9a69c66363153db.tar.xz | |
block: Clean up special command handling logic
Remove special-casing of non-rw fs style requests (discard). The nomerge
flags are consolidated in blk_types.h, and rq_mergeable() and
bio_mergeable() have been modified to use them.
bio_is_rw() is used in place of bio_has_data() a few places. This is
done to to distinguish true reads and writes from other fs type requests
that carry a payload (e.g. write same).
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 2d739ca10923..5cc29299f6ac 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1657,8 +1657,8 @@ generic_make_request_checks(struct bio *bio) goto end_io; } - if (unlikely(!(bio->bi_rw & REQ_DISCARD) && - nr_sectors > queue_max_hw_sectors(q))) { + if (likely(bio_is_rw(bio) && + nr_sectors > queue_max_hw_sectors(q))) { printk(KERN_ERR "bio too big device %s (%u > %u)\n", bdevname(bio->bi_bdev, b), bio_sectors(bio), @@ -1699,8 +1699,7 @@ generic_make_request_checks(struct bio *bio) if ((bio->bi_rw & REQ_DISCARD) && (!blk_queue_discard(q) || - ((bio->bi_rw & REQ_SECURE) && - !blk_queue_secdiscard(q)))) { + ((bio->bi_rw & REQ_SECURE) && !blk_queue_secdiscard(q)))) { err = -EOPNOTSUPP; goto end_io; } @@ -1818,7 +1817,7 @@ void submit_bio(int rw, struct bio *bio) * If it's a regular read/write or a barrier with data attached, * go through the normal accounting stuff before submission. */ - if (bio_has_data(bio) && !(rw & REQ_DISCARD)) { + if (bio_has_data(bio)) { if (rw & WRITE) { count_vm_events(PGPGOUT, count); } else { @@ -1864,7 +1863,7 @@ EXPORT_SYMBOL(submit_bio); */ int blk_rq_check_limits(struct request_queue *q, struct request *rq) { - if (rq->cmd_flags & REQ_DISCARD) + if (!rq_mergeable(rq)) return 0; if (blk_rq_sectors(rq) > queue_max_sectors(q) || @@ -2338,7 +2337,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes) req->buffer = bio_data(req->bio); /* update sector only for requests with clear definition of sector */ - if (req->cmd_type == REQ_TYPE_FS || (req->cmd_flags & REQ_DISCARD)) + if (req->cmd_type == REQ_TYPE_FS) req->__sector += total_bytes >> 9; /* mixed attributes always follow the first bio */ |