From 1afb20f30151dd4160877c827f5b7203f98627fb Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Fri, 25 Apr 2008 12:26:28 +0200 Subject: block: make rq_init() do a full memset() This requires moving rq_init() from get_request() to blk_alloc_request(). The upside is that we can now require an rq_init() from any path that wishes to hand the request to the block layer. rq_init() will be exported for the code that uses struct request without blk_get_request. This is a preparation for large command support, which needs to initialize struct request in a proper way (that is, just doing a memset() will not work). Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe --- block/blk-barrier.c | 7 +------ block/blk-core.c | 30 ++++-------------------------- 2 files changed, 5 insertions(+), 32 deletions(-) (limited to 'block') diff --git a/block/blk-barrier.c b/block/blk-barrier.c index 55c5f1fc4f1..722140ac175 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c @@ -143,10 +143,8 @@ static void queue_flush(struct request_queue *q, unsigned which) end_io = post_flush_end_io; } - rq->cmd_flags = REQ_HARDBARRIER; rq_init(q, rq); - rq->elevator_private = NULL; - rq->elevator_private2 = NULL; + rq->cmd_flags = REQ_HARDBARRIER; rq->rq_disk = q->bar_rq.rq_disk; rq->end_io = end_io; q->prepare_flush_fn(q, rq); @@ -167,14 +165,11 @@ static inline struct request *start_ordered(struct request_queue *q, blkdev_dequeue_request(rq); q->orig_bar_rq = rq; rq = &q->bar_rq; - rq->cmd_flags = 0; rq_init(q, rq); if (bio_data_dir(q->orig_bar_rq->bio) == WRITE) rq->cmd_flags |= REQ_RW; if (q->ordered & QUEUE_ORDERED_FUA) rq->cmd_flags |= REQ_FUA; - rq->elevator_private = NULL; - rq->elevator_private2 = NULL; init_request_from_bio(rq, q->orig_bar_rq->bio); rq->end_io = bar_end_io; diff --git a/block/blk-core.c b/block/blk-core.c index 2a438a93f72..e447799256d 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -107,40 +107,18 @@ struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev) } EXPORT_SYMBOL(blk_get_backing_dev_info); -/* - * We can't just memset() the structure, since the allocation path - * already stored some information in the request. - */ void rq_init(struct request_queue *q, struct request *rq) { + memset(rq, 0, sizeof(*rq)); + INIT_LIST_HEAD(&rq->queuelist); INIT_LIST_HEAD(&rq->donelist); rq->q = q; rq->sector = rq->hard_sector = (sector_t) -1; - rq->nr_sectors = rq->hard_nr_sectors = 0; - rq->current_nr_sectors = rq->hard_cur_sectors = 0; - rq->bio = rq->biotail = NULL; INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); - rq->rq_disk = NULL; - rq->nr_phys_segments = 0; - rq->nr_hw_segments = 0; - rq->ioprio = 0; - rq->special = NULL; - rq->buffer = NULL; rq->tag = -1; - rq->errors = 0; rq->ref_count = 1; - rq->cmd_len = 0; - memset(rq->cmd, 0, sizeof(rq->cmd)); - rq->data_len = 0; - rq->extra_len = 0; - rq->sense_len = 0; - rq->data = NULL; - rq->sense = NULL; - rq->end_io = NULL; - rq->end_io_data = NULL; - rq->next_rq = NULL; } static void req_bio_endio(struct request *rq, struct bio *bio, @@ -607,6 +585,8 @@ blk_alloc_request(struct request_queue *q, int rw, int priv, gfp_t gfp_mask) if (!rq) return NULL; + rq_init(q, rq); + /* * first three bits are identical in rq->cmd_flags and bio->bi_rw, * see bio.h and blkdev.h @@ -789,8 +769,6 @@ rq_starved: if (ioc_batching(q, ioc)) ioc->nr_batch_requests--; - rq_init(q, rq); - blk_add_trace_generic(q, bio, rw, BLK_TA_GETRQ); out: return rq; -- cgit v1.2.3