From 0c4de0f33b0a86a426c0c3958cd40d8c82ede8d2 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 19 Jul 2016 11:31:50 +0200 Subject: [PATCH] block: ensure bios return from blk_get_request are properly initialized blk_get_request is used for BLOCK_PC and similar passthrough requests. Currently we always need to call blk_rq_set_block_pc or an open coded version of it to allow appending bios using the request mapping helpers later on, which is a somewhat awkward API. Instead move the initialization part of blk_rq_set_block_pc into blk_get_request, so that we always have a safe to use request. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- block/blk-core.c | 12 +++++++----- block/blk-mq.c | 4 ++++ drivers/block/virtio_blk.c | 1 - drivers/nvme/host/core.c | 4 ---- 4 files changed, 11 insertions(+), 10 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index dd325638e102..4d8794925fe9 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1294,10 +1294,15 @@ static struct request *blk_old_get_request(struct request_queue *q, int rw, spin_lock_irq(q->queue_lock); rq = get_request(q, rw, 0, NULL, gfp_mask); - if (IS_ERR(rq)) + if (IS_ERR(rq)) { spin_unlock_irq(q->queue_lock); - /* q->queue_lock is unlocked at this point */ + return rq; + } + /* q->queue_lock is unlocked at this point */ + rq->__data_len = 0; + rq->__sector = (sector_t) -1; + rq->bio = rq->biotail = NULL; return rq; } @@ -1377,9 +1382,6 @@ EXPORT_SYMBOL(blk_make_request); 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)); } EXPORT_SYMBOL(blk_rq_set_block_pc); diff --git a/block/blk-mq.c b/block/blk-mq.c index 7aa60c4f56fd..8f4fac87a395 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -263,6 +263,10 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, blk_queue_exit(q); return ERR_PTR(-EWOULDBLOCK); } + + rq->__data_len = 0; + rq->__sector = (sector_t) -1; + rq->bio = rq->biotail = NULL; return rq; } EXPORT_SYMBOL(blk_mq_alloc_request); diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index a85a14355efa..1523e05c46fc 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -243,7 +243,6 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str) req = blk_get_request(q, READ, GFP_KERNEL); if (IS_ERR(req)) return PTR_ERR(req); - blk_rq_set_block_pc(req); req->cmd_type = REQ_TYPE_DRV_PRIV; err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL); diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index cf4b75088876..9f0ec3b4659f 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -222,10 +222,6 @@ struct request *nvme_alloc_request(struct request_queue *q, req->cmd_type = REQ_TYPE_DRV_PRIV; req->cmd_flags |= REQ_FAILFAST_DRIVER; - req->__data_len = 0; - req->__sector = (sector_t) -1; - req->bio = req->biotail = NULL; - req->cmd = (unsigned char *)cmd; req->cmd_len = sizeof(struct nvme_command); -- GitLab