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block: move the io_stat flag setting to queue_limits

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Move the io_stat flag into the queue_limits feature field so that it can
be set atomically with the queue frozen.

Simplify md and dm to set the flag unconditionally instead of avoiding
setting a simple flag for cases where it already is set by other means,
which is a bit pointless.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240617060532.127975-17-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-06-17 08:04:43 +02:00 committed by Jens Axboe
parent 39a9f1c334
commit cdb2497918
8 changed files with 26 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
block/blk-mq-debugfs.c
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@ -84,7 +84,6 @@ static const char *const blk_queue_flag_name[] = {
QUEUE_FLAG_NAME(NOMERGES),
QUEUE_FLAG_NAME(SAME_COMP),
QUEUE_FLAG_NAME(FAIL_IO),
QUEUE_FLAG_NAME(IO_STAT),
QUEUE_FLAG_NAME(NOXMERGES),
QUEUE_FLAG_NAME(SYNCHRONOUS),
QUEUE_FLAG_NAME(SAME_FORCE),

6
block/blk-mq.c
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@ -4116,7 +4116,11 @@ struct request_queue *blk_mq_alloc_queue(struct blk_mq_tag_set *set,
struct request_queue *q;
int ret;
q = blk_alloc_queue(lim ? lim : &default_lim, set->numa_node);
if (!lim)
lim = &default_lim;
lim->features |= BLK_FEAT_IO_STAT;
q = blk_alloc_queue(lim, set->numa_node);
if (IS_ERR(q))
return q;
q->queuedata = queuedata;

2
block/blk-sysfs.c
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@ -324,7 +324,7 @@ queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
QUEUE_SYSFS_FEATURE(rotational, BLK_FEAT_ROTATIONAL)
QUEUE_SYSFS_FEATURE(add_random, BLK_FEAT_ADD_RANDOM)
QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
QUEUE_SYSFS_FEATURE(iostats, BLK_FEAT_IO_STAT)
QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
#undef QUEUE_SYSFS_BIT_FNS

12
drivers/md/dm-table.c
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@ -579,6 +579,12 @@ int dm_split_args(int *argc, char ***argvp, char *input)
return 0;
}
static void dm_set_stacking_limits(struct queue_limits *limits)
{
blk_set_stacking_limits(limits);
limits->features |= BLK_FEAT_IO_STAT;
}
/*
* Impose necessary and sufficient conditions on a devices's table such
* that any incoming bio which respects its logical_block_size can be
@ -617,7 +623,7 @@ static int validate_hardware_logical_block_alignment(struct dm_table *t,
for (i = 0; i < t->num_targets; i++) {
ti = dm_table_get_target(t, i);
blk_set_stacking_limits(&ti_limits);
dm_set_stacking_limits(&ti_limits);
/* combine all target devices' limits */
if (ti->type->iterate_devices)
@ -1591,7 +1597,7 @@ int dm_calculate_queue_limits(struct dm_table *t,
unsigned int zone_sectors = 0;
bool zoned = false;
blk_set_stacking_limits(limits);
dm_set_stacking_limits(limits);
t->integrity_supported = true;
for (unsigned int i = 0; i < t->num_targets; i++) {
@ -1604,7 +1610,7 @@ int dm_calculate_queue_limits(struct dm_table *t,
for (unsigned int i = 0; i < t->num_targets; i++) {
struct dm_target *ti = dm_table_get_target(t, i);
blk_set_stacking_limits(&ti_limits);
dm_set_stacking_limits(&ti_limits);
if (!ti->type->iterate_devices) {
/* Set I/O hints portion of queue limits */

13
drivers/md/dm.c
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@ -2386,22 +2386,15 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
struct table_device *td;
int r;
switch (type) {
case DM_TYPE_REQUEST_BASED:
WARN_ON_ONCE(type == DM_TYPE_NONE);
if (type == DM_TYPE_REQUEST_BASED) {
md->disk->fops = &dm_rq_blk_dops;
r = dm_mq_init_request_queue(md, t);
if (r) {
DMERR("Cannot initialize queue for request-based dm mapped device");
return r;
}
break;
case DM_TYPE_BIO_BASED:
case DM_TYPE_DAX_BIO_BASED:
blk_queue_flag_set(QUEUE_FLAG_IO_STAT, md->queue);
break;
case DM_TYPE_NONE:
WARN_ON_ONCE(true);
break;
}
r = dm_calculate_queue_limits(t, &limits);

5
drivers/md/md.c
View File

@ -5787,7 +5787,8 @@ struct mddev *md_alloc(dev_t dev, char *name)
int unit;
int error;
struct queue_limits lim = {
.features = BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA,
.features = BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA |
BLK_FEAT_IO_STAT,
};
/*
@ -6152,8 +6153,6 @@ int md_run(struct mddev *mddev)
if (!mddev_is_dm(mddev)) {
struct request_queue *q = mddev->gendisk->queue;
blk_queue_flag_set(QUEUE_FLAG_IO_STAT, q);
/* Set the NOWAIT flags if all underlying devices support it */
if (nowait)
blk_queue_flag_set(QUEUE_FLAG_NOWAIT, q);

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

@ -538,6 +538,7 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
blk_set_stacking_limits(&lim);
lim.dma_alignment = 3;
lim.features |= BLK_FEAT_IO_STAT;
if (head->ids.csi != NVME_CSI_ZNS)
lim.max_zone_append_sectors = 0;
@ -550,7 +551,6 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
ctrl->subsys->instance, head->instance);
blk_queue_flag_set(QUEUE_FLAG_NOWAIT, head->disk->queue);
blk_queue_flag_set(QUEUE_FLAG_IO_STAT, head->disk->queue);
/*
* This assumes all controllers that refer to a namespace either
* support poll queues or not. That is not a strict guarantee,

9
include/linux/blkdev.h
View File

@ -295,6 +295,9 @@ enum {
/* contributes to the random number pool */
BLK_FEAT_ADD_RANDOM = (1u << 3),
/* do disk/partitions IO accounting */
BLK_FEAT_IO_STAT = (1u << 4),
};
/*
@ -558,7 +561,6 @@ struct request_queue {
#define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
#define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
#define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
#define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
#define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
#define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
@ -577,8 +579,7 @@ struct request_queue {
#define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
#define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/
#define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
(1UL << QUEUE_FLAG_SAME_COMP) | \
#define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_SAME_COMP) | \
(1UL << QUEUE_FLAG_NOWAIT))
void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
@ -592,7 +593,7 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
#define blk_queue_noxmerges(q) \
test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
#define blk_queue_nonrot(q) ((q)->limits.features & BLK_FEAT_ROTATIONAL)
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_io_stat(q) ((q)->limits.features & BLK_FEAT_IO_STAT)
#define blk_queue_zone_resetall(q) \
test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)