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blk-mq: add a flags parameter to blk_mq_alloc_request 

We already have the reserved flag, and a nowait flag awkwardly encoded as
a gfp_t.  Add a real flags argument to make the scheme more extensible and
allow for a nicer calling convention.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-11-26 09:13:05 +01:00 committed by Jens Axboe
parent d7cf931dd9
commit 6f3b0e8bcf
11 changed files with 42 additions and 42 deletions
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11
block/blk-core.c
View File

@ -630,7 +630,7 @@ struct request_queue *blk_alloc_queue(gfp_t gfp_mask)
}
EXPORT_SYMBOL(blk_alloc_queue);
int blk_queue_enter(struct request_queue *q, gfp_t gfp)
int blk_queue_enter(struct request_queue *q, bool nowait)
{
while (true) {
int ret;
@ -638,7 +638,7 @@ int blk_queue_enter(struct request_queue *q, gfp_t gfp)
if (percpu_ref_tryget_live(&q->q_usage_counter))
return 0;
if (!gfpflags_allow_blocking(gfp))
if (nowait)
return -EBUSY;
ret = wait_event_interruptible(q->mq_freeze_wq,
@ -1276,7 +1276,9 @@ static struct request *blk_old_get_request(struct request_queue *q, int rw,
struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask)
{
if (q->mq_ops)
return blk_mq_alloc_request(q, rw, gfp_mask, false);
return blk_mq_alloc_request(q, rw,
(gfp_mask & __GFP_DIRECT_RECLAIM) ?
0 : BLK_MQ_REQ_NOWAIT);
else
return blk_old_get_request(q, rw, gfp_mask);
}
@ -2044,8 +2046,7 @@ blk_qc_t generic_make_request(struct bio *bio)
do {
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
if (likely(blk_queue_enter(q, __GFP_DIRECT_RECLAIM) == 0)) {
if (likely(blk_queue_enter(q, false) == 0)) {
ret = q->make_request_fn(q, bio);
blk_queue_exit(q);

11
block/blk-mq-tag.c
View File

@ -268,7 +268,7 @@ static int bt_get(struct blk_mq_alloc_data *data,
if (tag != -1)
return tag;
if (!gfpflags_allow_blocking(data->gfp))
if (data->flags & BLK_MQ_REQ_NOWAIT)
return -1;
bs = bt_wait_ptr(bt, hctx);
@ -303,7 +303,7 @@ static int bt_get(struct blk_mq_alloc_data *data,
data->ctx = blk_mq_get_ctx(data->q);
data->hctx = data->q->mq_ops->map_queue(data->q,
data->ctx->cpu);
if (data->reserved) {
if (data->flags & BLK_MQ_REQ_RESERVED) {
bt = &data->hctx->tags->breserved_tags;
} else {
last_tag = &data->ctx->last_tag;
@ -349,10 +349,9 @@ static unsigned int __blk_mq_get_reserved_tag(struct blk_mq_alloc_data *data)
unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
{
if (!data->reserved)
return __blk_mq_get_tag(data);
return __blk_mq_get_reserved_tag(data);
if (data->flags & BLK_MQ_REQ_RESERVED)
return __blk_mq_get_reserved_tag(data);
return __blk_mq_get_tag(data);
}
static struct bt_wait_state *bt_wake_ptr(struct blk_mq_bitmap_tags *bt)

20
block/blk-mq.c
View File

@ -229,8 +229,8 @@ __blk_mq_alloc_request(struct blk_mq_alloc_data *data, int rw)
return NULL;
}
struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
bool reserved)
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
unsigned int flags)
{
struct blk_mq_ctx *ctx;
struct blk_mq_hw_ctx *hctx;
@ -238,24 +238,22 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
struct blk_mq_alloc_data alloc_data;
int ret;
ret = blk_queue_enter(q, gfp);
ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT);
if (ret)
return ERR_PTR(ret);
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
blk_mq_set_alloc_data(&alloc_data, q, gfp & ~__GFP_DIRECT_RECLAIM,
reserved, ctx, hctx);
blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
rq = __blk_mq_alloc_request(&alloc_data, rw);
if (!rq && (gfp & __GFP_DIRECT_RECLAIM)) {
if (!rq && !(flags & BLK_MQ_REQ_NOWAIT)) {
__blk_mq_run_hw_queue(hctx);
blk_mq_put_ctx(ctx);
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
blk_mq_set_alloc_data(&alloc_data, q, gfp, reserved, ctx,
hctx);
blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
rq = __blk_mq_alloc_request(&alloc_data, rw);
ctx = alloc_data.ctx;
}
@ -1175,8 +1173,7 @@ static struct request *blk_mq_map_request(struct request_queue *q,
rw |= REQ_SYNC;
trace_block_getrq(q, bio, rw);
blk_mq_set_alloc_data(&alloc_data, q, GFP_ATOMIC, false, ctx,
hctx);
blk_mq_set_alloc_data(&alloc_data, q, BLK_MQ_REQ_NOWAIT, ctx, hctx);
rq = __blk_mq_alloc_request(&alloc_data, rw);
if (unlikely(!rq)) {
__blk_mq_run_hw_queue(hctx);
@ -1185,8 +1182,7 @@ static struct request *blk_mq_map_request(struct request_queue *q,
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
blk_mq_set_alloc_data(&alloc_data, q,
__GFP_RECLAIM|__GFP_HIGH, false, ctx, hctx);
blk_mq_set_alloc_data(&alloc_data, q, 0, ctx, hctx);
rq = __blk_mq_alloc_request(&alloc_data, rw);
ctx = alloc_data.ctx;
hctx = alloc_data.hctx;

11
block/blk-mq.h
View File

@ -96,8 +96,7 @@ static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
struct blk_mq_alloc_data {
/* input parameter */
struct request_queue *q;
gfp_t gfp;
bool reserved;
unsigned int flags;
/* input & output parameter */
struct blk_mq_ctx *ctx;
@ -105,13 +104,11 @@ struct blk_mq_alloc_data {
};
static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
struct request_queue *q, gfp_t gfp, bool reserved,
struct blk_mq_ctx *ctx,
struct blk_mq_hw_ctx *hctx)
struct request_queue *q, unsigned int flags,
struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
{
data->q = q;
data->gfp = gfp;
data->reserved = reserved;
data->flags = flags;
data->ctx = ctx;
data->hctx = hctx;
}

2
drivers/block/mtip32xx/mtip32xx.c
View File

@ -173,7 +173,7 @@ static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
{
struct request *rq;
rq = blk_mq_alloc_request(dd->queue, 0, __GFP_RECLAIM, true);
rq = blk_mq_alloc_request(dd->queue, 0, BLK_MQ_REQ_RESERVED);
return blk_mq_rq_to_pdu(rq);
}

2
drivers/block/null_blk.c
View File

@ -464,7 +464,7 @@ static int null_lnvm_submit_io(struct request_queue *q, struct nvm_rq *rqd)
struct request *rq;
struct bio *bio = rqd->bio;
rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0);
rq = blk_mq_alloc_request(q, bio_rw(bio), 0);
if (IS_ERR(rq))
return -ENOMEM;

2
drivers/nvme/host/lightnvm.c
View File

@ -470,7 +470,7 @@ static int nvme_nvm_submit_io(struct request_queue *q, struct nvm_rq *rqd)
struct bio *bio = rqd->bio;
struct nvme_nvm_command *cmd;
rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0);
rq = blk_mq_alloc_request(q, bio_rw(bio), 0);
if (IS_ERR(rq))
return -ENOMEM;

11
drivers/nvme/host/pci.c
View File

@ -1041,7 +1041,7 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
struct request *req;
int ret;
req = blk_mq_alloc_request(q, write, GFP_KERNEL, false);
req = blk_mq_alloc_request(q, write, 0);
if (IS_ERR(req))
return PTR_ERR(req);
@ -1094,7 +1094,8 @@ static int nvme_submit_async_admin_req(struct nvme_dev *dev)
struct nvme_cmd_info *cmd_info;
struct request *req;
req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC, true);
req = blk_mq_alloc_request(dev->admin_q, WRITE,
BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED);
if (IS_ERR(req))
return PTR_ERR(req);
@ -1119,7 +1120,7 @@ static int nvme_submit_admin_async_cmd(struct nvme_dev *dev,
struct request *req;
struct nvme_cmd_info *cmd_rq;
req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_KERNEL, false);
req = blk_mq_alloc_request(dev->admin_q, WRITE, 0);
if (IS_ERR(req))
return PTR_ERR(req);
@ -1320,8 +1321,8 @@ static void nvme_abort_req(struct request *req)
if (!dev->abort_limit)
return;
abort_req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC,
false);
abort_req = blk_mq_alloc_request(dev->admin_q, WRITE,
BLK_MQ_REQ_NOWAIT);
if (IS_ERR(abort_req))
return;

4
fs/block_dev.c
View File

@ -395,7 +395,7 @@ int bdev_read_page(struct block_device *bdev, sector_t sector,
if (!ops->rw_page || bdev_get_integrity(bdev))
return result;
result = blk_queue_enter(bdev->bd_queue, GFP_KERNEL);
result = blk_queue_enter(bdev->bd_queue, false);
if (result)
return result;
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ);
@ -432,7 +432,7 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
if (!ops->rw_page || bdev_get_integrity(bdev))
return -EOPNOTSUPP;
result = blk_queue_enter(bdev->bd_queue, GFP_KERNEL);
result = blk_queue_enter(bdev->bd_queue, false);
if (result)
return result;

8
include/linux/blk-mq.h
View File

@ -188,8 +188,14 @@ void blk_mq_insert_request(struct request *, bool, bool, bool);
void blk_mq_free_request(struct request *rq);
void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
enum {
BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
};
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
gfp_t gfp, bool reserved);
unsigned int flags);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags);

2
include/linux/blkdev.h
View File

@ -794,7 +794,7 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
struct scsi_ioctl_command __user *);
extern int blk_queue_enter(struct request_queue *q, gfp_t gfp);
extern int blk_queue_enter(struct request_queue *q, bool nowait);
extern void blk_queue_exit(struct request_queue *q);
extern void blk_start_queue(struct request_queue *q);
extern void blk_stop_queue(struct request_queue *q);