[PATCH 16/26] block: move the io_stat flag setting to queue_limits
Christoph Hellwig
hch at lst.de
Mon Jun 10 22:19:16 PDT 2024
Move the io_stat flag into the queue_limits feature field so that it
can be set atomically and all I/O is frozen when changing the flag.
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 at lst.de>
---
block/blk-mq-debugfs.c | 1 -
block/blk-mq.c | 6 +++++-
block/blk-sysfs.c | 2 +-
drivers/md/dm-table.c | 12 +++++++++---
drivers/md/dm.c | 13 +++----------
drivers/md/md.c | 5 ++---
drivers/nvme/host/multipath.c | 2 +-
include/linux/blkdev.h | 9 +++++----
8 files changed, 26 insertions(+), 24 deletions(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 6b7edb50bfd3fa..cbe99444ed1a54 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -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),
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 58b0d6c7cc34d6..cf67dc13f7dd4c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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;
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 9174aca3b85526..6f58530fb3c08e 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -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
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 7654babc2775c1..3e3b713502f61e 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -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 */
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 13037d6a6f62a2..8a976cee448bed 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index c23423c51fb7c2..8db0db8d5a27ac 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -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);
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 58c13304e558e0..eea727cfa9e67d 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -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,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e6a2382e21c4fe..f8e38f94fd8c9a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -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)
--
2.43.0
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