From f27b087b81b70513b8c61ec20596c868f7b93474 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 6 Jun 2014 07:57:37 -0600 Subject: block: add blk_rq_set_block_pc() With the optimizations around not clearing the full request at alloc time, we are leaving some of the needed init for REQ_TYPE_BLOCK_PC up to the user allocating the request. Add a blk_rq_set_block_pc() that sets the command type to REQ_TYPE_BLOCK_PC, and properly initializes the members associated with this type of request. Update callers to use this function instead of manipulating rq->cmd_type directly. Includes fixes from Christoph Hellwig for my half-assed attempt. Signed-off-by: Jens Axboe --- block/blk-core.c | 18 ++++++++++++++++++ block/bsg.c | 3 ++- block/scsi_ioctl.c | 6 +++--- 3 files changed, 23 insertions(+), 4 deletions(-) (limited to 'block') diff --git a/block/blk-core.c b/block/blk-core.c index 40d654861c33..9aca8c71e70b 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1218,6 +1218,8 @@ struct request *blk_make_request(struct request_queue *q, struct bio *bio, if (unlikely(!rq)) return ERR_PTR(-ENOMEM); + blk_rq_set_block_pc(rq); + for_each_bio(bio) { struct bio *bounce_bio = bio; int ret; @@ -1234,6 +1236,22 @@ struct request *blk_make_request(struct request_queue *q, struct bio *bio, } EXPORT_SYMBOL(blk_make_request); +/** + * blk_rq_set_block_pc - initialize a requeest to type BLOCK_PC + * @rq: request to be initialized + * + */ +void blk_rq_set_block_pc(struct request *rq) +{ + rq->cmd_type = REQ_TYPE_BLOCK_PC; + rq->__data_len = 0; + rq->__sector = (sector_t) -1; + rq->bio = rq->biotail = NULL; + memset(rq->__cmd, 0, sizeof(rq->__cmd)); + rq->cmd = rq->__cmd; +} +EXPORT_SYMBOL(blk_rq_set_block_pc); + /** * blk_requeue_request - put a request back on queue * @q: request queue where request should be inserted diff --git a/block/bsg.c b/block/bsg.c index e5214c148096..ff46addde5d8 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -196,7 +196,6 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, * fill in request structure */ rq->cmd_len = hdr->request_len; - rq->cmd_type = REQ_TYPE_BLOCK_PC; rq->timeout = msecs_to_jiffies(hdr->timeout); if (!rq->timeout) @@ -273,6 +272,8 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm, rq = blk_get_request(q, rw, GFP_KERNEL); if (!rq) return ERR_PTR(-ENOMEM); + blk_rq_set_block_pc(rq); + ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); if (ret) goto out; diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 9c28a5b38042..14695c6221c8 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -229,7 +229,6 @@ static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, * fill in request structure */ rq->cmd_len = hdr->cmd_len; - rq->cmd_type = REQ_TYPE_BLOCK_PC; rq->timeout = msecs_to_jiffies(hdr->timeout); if (!rq->timeout) @@ -311,6 +310,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); if (!rq) return -ENOMEM; + blk_rq_set_block_pc(rq); if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { blk_put_request(rq); @@ -491,7 +491,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, memset(sense, 0, sizeof(sense)); rq->sense = sense; rq->sense_len = 0; - rq->cmd_type = REQ_TYPE_BLOCK_PC; + blk_rq_set_block_pc(rq); blk_execute_rq(q, disk, rq, 0); @@ -524,7 +524,7 @@ static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, int err; rq = blk_get_request(q, WRITE, __GFP_WAIT); - rq->cmd_type = REQ_TYPE_BLOCK_PC; + blk_rq_set_block_pc(rq); rq->timeout = BLK_DEFAULT_SG_TIMEOUT; rq->cmd[0] = cmd; rq->cmd[4] = data; -- cgit v1.2.3