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authorOmar Sandoval <osandov@fb.com>2017-02-27 10:28:27 -0800
committerJens Axboe <axboe@fb.com>2017-03-02 08:56:04 -0700
commit6d2809d51a5079f01a416d91dd63b0766cb685d0 (patch)
tree7f8b40edd637604227357062ce0c63be550b8ea4 /block
parent415b806de5576b656f3ff94366589af9a161d0c8 (diff)
downloadlinux-6d2809d51a5079f01a416d91dd63b0766cb685d0.tar.bz2
blk-mq: make blk_mq_alloc_request_hctx() allocate a scheduler request
blk_mq_alloc_request_hctx() allocates a driver request directly, unlike its blk_mq_alloc_request() counterpart. It also crashes because it doesn't update the tags->rqs map. Fix it by making it allocate a scheduler request. Reported-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com> Tested-by: Sagi Grimberg <sagi@grimberg.me>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-sched.c11
-rw-r--r--block/blk-mq.c33
2 files changed, 20 insertions, 24 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 46ca965fff5c..5697b23412a1 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -110,15 +110,14 @@ struct request *blk_mq_sched_get_request(struct request_queue *q,
struct blk_mq_alloc_data *data)
{
struct elevator_queue *e = q->elevator;
- struct blk_mq_hw_ctx *hctx;
- struct blk_mq_ctx *ctx;
struct request *rq;
blk_queue_enter_live(q);
- ctx = blk_mq_get_ctx(q);
- hctx = blk_mq_map_queue(q, ctx->cpu);
-
- blk_mq_set_alloc_data(data, q, data->flags, ctx, hctx);
+ data->q = q;
+ if (likely(!data->ctx))
+ data->ctx = blk_mq_get_ctx(q);
+ if (likely(!data->hctx))
+ data->hctx = blk_mq_map_queue(q, data->ctx->cpu);
if (e) {
data->flags |= BLK_MQ_REQ_INTERNAL;
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4df5fb42c74f..85a7047d8b03 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -273,10 +273,9 @@ EXPORT_SYMBOL(blk_mq_alloc_request);
struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
unsigned int flags, unsigned int hctx_idx)
{
- struct blk_mq_hw_ctx *hctx;
- struct blk_mq_ctx *ctx;
+ struct blk_mq_alloc_data alloc_data = { .flags = flags };
struct request *rq;
- struct blk_mq_alloc_data alloc_data;
+ unsigned int cpu;
int ret;
/*
@@ -299,25 +298,23 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
* Check if the hardware context is actually mapped to anything.
* If not tell the caller that it should skip this queue.
*/
- hctx = q->queue_hw_ctx[hctx_idx];
- if (!blk_mq_hw_queue_mapped(hctx)) {
- ret = -EXDEV;
- goto out_queue_exit;
+ alloc_data.hctx = q->queue_hw_ctx[hctx_idx];
+ if (!blk_mq_hw_queue_mapped(alloc_data.hctx)) {
+ blk_queue_exit(q);
+ return ERR_PTR(-EXDEV);
}
- ctx = __blk_mq_get_ctx(q, cpumask_first(hctx->cpumask));
+ cpu = cpumask_first(alloc_data.hctx->cpumask);
+ alloc_data.ctx = __blk_mq_get_ctx(q, cpu);
- blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
- rq = __blk_mq_alloc_request(&alloc_data, rw);
- if (!rq) {
- ret = -EWOULDBLOCK;
- goto out_queue_exit;
- }
-
- return rq;
+ rq = blk_mq_sched_get_request(q, NULL, rw, &alloc_data);
-out_queue_exit:
+ blk_mq_put_ctx(alloc_data.ctx);
blk_queue_exit(q);
- return ERR_PTR(ret);
+
+ if (!rq)
+ return ERR_PTR(-EWOULDBLOCK);
+
+ return rq;
}
EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);