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From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-bcache@vger.kernel.org, Jan Kara <jack@suse.cz>,
	Mike Snitzer <snitzer@redhat.com>,
	linux-mm@kvack.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jan Kara <jack@suse.com>, Josef Bacik <josef@toxicpanda.com>,
	Coly Li <colyli@suse.de>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	dm-devel@redhat.com, linux-mtd@lists.infradead.org,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>,
	Tejun Heo <tj@kernel.org>
Subject: [dm-devel] [PATCH 31/45] block: move disk stat accounting to struct block_device
Date: Sat, 28 Nov 2020 17:14:56 +0100
Message-ID: <20201128161510.347752-32-hch@lst.de> (raw)
In-Reply-To: <20201128161510.347752-1-hch@lst.de>

Move the dkstats and stamp field to struct block_device in preparation
of killing struct hd_struct.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 block/blk-cgroup.c        |  2 +-
 block/blk-core.c          |  4 ++--
 block/blk.h               |  1 -
 block/genhd.c             | 14 ++++----------
 block/partitions/core.c   |  9 +--------
 fs/block_dev.c            | 10 ++++++++++
 include/linux/blk_types.h |  2 ++
 include/linux/genhd.h     |  2 --
 include/linux/part_stat.h | 38 +++++++++++++++++++-------------------
 9 files changed, 39 insertions(+), 43 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 19650eb42b9f00..5c0a9d588e6312 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -830,7 +830,7 @@ static void blkcg_fill_root_iostats(void)
 		for_each_possible_cpu(cpu) {
 			struct disk_stats *cpu_dkstats;
 
-			cpu_dkstats = per_cpu_ptr(part->dkstats, cpu);
+			cpu_dkstats = per_cpu_ptr(part->bdev->bd_stats, cpu);
 			tmp.ios[BLKG_IOSTAT_READ] +=
 				cpu_dkstats->ios[STAT_READ];
 			tmp.ios[BLKG_IOSTAT_WRITE] +=
diff --git a/block/blk-core.c b/block/blk-core.c
index 988f45094a387b..d2c9cb24e087f3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1264,9 +1264,9 @@ static void update_io_ticks(struct hd_struct *part, unsigned long now, bool end)
 {
 	unsigned long stamp;
 again:
-	stamp = READ_ONCE(part->stamp);
+	stamp = READ_ONCE(part->bdev->bd_stamp);
 	if (unlikely(stamp != now)) {
-		if (likely(cmpxchg(&part->stamp, stamp, now) == stamp))
+		if (likely(cmpxchg(&part->bdev->bd_stamp, stamp, now) == stamp))
 			__part_stat_add(part, io_ticks, end ? now - stamp : 1);
 	}
 	if (part->partno) {
diff --git a/block/blk.h b/block/blk.h
index 09cee7024fb43e..3f801f6e86f8a1 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -381,7 +381,6 @@ static inline void hd_struct_put(struct hd_struct *part)
 
 static inline void hd_free_part(struct hd_struct *part)
 {
-	free_percpu(part->dkstats);
 	kfree(part->info);
 	bdput(part->bdev);
 	percpu_ref_exit(&part->ref);
diff --git a/block/genhd.c b/block/genhd.c
index c6016fde4725b0..9eead2970cb3d4 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -104,7 +104,7 @@ static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat)
 
 	memset(stat, 0, sizeof(struct disk_stats));
 	for_each_possible_cpu(cpu) {
-		struct disk_stats *ptr = per_cpu_ptr(part->dkstats, cpu);
+		struct disk_stats *ptr = per_cpu_ptr(part->bdev->bd_stats, cpu);
 		int group;
 
 		for (group = 0; group < NR_STAT_GROUPS; group++) {
@@ -883,7 +883,7 @@ void del_gendisk(struct gendisk *disk)
 	kobject_put(disk->slave_dir);
 
 	part_stat_set_all(&disk->part0, 0);
-	disk->part0.stamp = 0;
+	disk->part0.bdev->bd_stamp = 0;
 	if (!sysfs_deprecated)
 		sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
 	pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
@@ -1620,19 +1620,15 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
 	if (!disk->part0.bdev)
 		goto out_free_disk;
 
-	disk->part0.dkstats = alloc_percpu(struct disk_stats);
-	if (!disk->part0.dkstats)
-		goto out_bdput;
-
 	disk->node_id = node_id;
 	if (disk_expand_part_tbl(disk, 0))
-		goto out_free_bdstats;
+		goto out_bdput;
 
 	ptbl = rcu_dereference_protected(disk->part_tbl, 1);
 	rcu_assign_pointer(ptbl->part[0], &disk->part0);
 
 	if (hd_ref_init(&disk->part0))
-		goto out_free_bdstats;
+		goto out_bdput;
 
 	disk->minors = minors;
 	rand_initialize_disk(disk);
@@ -1641,8 +1637,6 @@ struct gendisk *__alloc_disk_node(int minors, int node_id)
 	device_initialize(disk_to_dev(disk));
 	return disk;
 
-out_free_bdstats:
-	free_percpu(disk->part0.dkstats);
 out_bdput:
 	bdput(disk->part0.bdev);
 out_free_disk:
diff --git a/block/partitions/core.c b/block/partitions/core.c
index bcfa8215bd5ef3..8924e1ea8b2ad6 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -409,14 +409,9 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
 	if (!p)
 		return ERR_PTR(-EBUSY);
 
-	err = -ENOMEM;
-	p->dkstats = alloc_percpu(struct disk_stats);
-	if (!p->dkstats)
-		goto out_free;
-
 	bdev = bdev_alloc(disk, partno);
 	if (!bdev)
-		goto out_free_stats;
+		goto out_free;
 	p->bdev = bdev;
 
 	pdev = part_to_dev(p);
@@ -490,8 +485,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
 	kfree(p->info);
 out_bdput:
 	bdput(bdev);
-out_free_stats:
-	free_percpu(p->dkstats);
 out_free:
 	kfree(p);
 	return ERR_PTR(err);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 31ee5a857f7153..0832c7830f3a10 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -32,6 +32,7 @@
 #include <linux/cleancache.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/falloc.h>
+#include <linux/part_stat.h>
 #include <linux/uaccess.h>
 #include <linux/suspend.h>
 #include "internal.h"
@@ -781,6 +782,10 @@ static struct inode *bdev_alloc_inode(struct super_block *sb)
 
 static void bdev_free_inode(struct inode *inode)
 {
+	struct block_device *bdev = I_BDEV(inode);
+
+	free_percpu(bdev->bd_stats);
+
 	kmem_cache_free(bdev_cachep, BDEV_I(inode));
 }
 
@@ -875,6 +880,11 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
 #ifdef CONFIG_SYSFS
 	INIT_LIST_HEAD(&bdev->bd_holder_disks);
 #endif
+	bdev->bd_stats = alloc_percpu(struct disk_stats);
+	if (!bdev->bd_stats) {
+		iput(inode);
+		return NULL;
+	}
 	return bdev;
 }
 
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 2e0a9bd9688d28..520011b95276fb 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -20,6 +20,8 @@ typedef void (bio_end_io_t) (struct bio *);
 struct bio_crypt_ctx;
 
 struct block_device {
+	struct disk_stats __percpu *bd_stats;
+	unsigned long		bd_stamp;
 	dev_t			bd_dev;
 	int			bd_openers;
 	struct inode *		bd_inode;	/* will die */
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 30d4785b7df8bb..804ac45fbfbc53 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -52,8 +52,6 @@ struct partition_meta_info {
 
 struct hd_struct {
 	sector_t start_sect;
-	unsigned long stamp;
-	struct disk_stats __percpu *dkstats;
 	struct percpu_ref ref;
 
 	struct block_device *bdev;
diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h
index 24125778ef3ec7..87ad60106e1db0 100644
--- a/include/linux/part_stat.h
+++ b/include/linux/part_stat.h
@@ -25,17 +25,17 @@ struct disk_stats {
 #define part_stat_unlock()	preempt_enable()
 
 #define part_stat_get_cpu(part, field, cpu)				\
-	(per_cpu_ptr((part)->dkstats, (cpu))->field)
+	(per_cpu_ptr((part)->bdev->bd_stats, (cpu))->field)
 
 #define part_stat_get(part, field)					\
 	part_stat_get_cpu(part, field, smp_processor_id())
 
 #define part_stat_read(part, field)					\
 ({									\
-	typeof((part)->dkstats->field) res = 0;				\
+	typeof((part)->bdev->bd_stats->field) res = 0;			\
 	unsigned int _cpu;						\
 	for_each_possible_cpu(_cpu)					\
-		res += per_cpu_ptr((part)->dkstats, _cpu)->field;	\
+		res += per_cpu_ptr((part)->bdev->bd_stats, _cpu)->field; \
 	res;								\
 })
 
@@ -44,7 +44,7 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
 	int i;
 
 	for_each_possible_cpu(i)
-		memset(per_cpu_ptr(part->dkstats, i), value,
+		memset(per_cpu_ptr(part->bdev->bd_stats, i), value,
 				sizeof(struct disk_stats));
 }
 
@@ -54,7 +54,7 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
 	 part_stat_read(part, field[STAT_DISCARD]))
 
 #define __part_stat_add(part, field, addnd)				\
-	__this_cpu_add((part)->dkstats->field, addnd)
+	__this_cpu_add((part)->bdev->bd_stats->field, addnd)
 
 #define part_stat_add(part, field, addnd)	do {			\
 	__part_stat_add((part), field, addnd);				\
@@ -63,20 +63,20 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
 				field, addnd);				\
 } while (0)
 
-#define part_stat_dec(gendiskp, field)					\
-	part_stat_add(gendiskp, field, -1)
-#define part_stat_inc(gendiskp, field)					\
-	part_stat_add(gendiskp, field, 1)
-#define part_stat_sub(gendiskp, field, subnd)				\
-	part_stat_add(gendiskp, field, -subnd)
+#define part_stat_dec(part, field)					\
+	part_stat_add(part, field, -1)
+#define part_stat_inc(part, field)					\
+	part_stat_add(part, field, 1)
+#define part_stat_sub(part, field, subnd)				\
+	part_stat_add(part, field, -subnd)
 
-#define part_stat_local_dec(gendiskp, field)				\
-	local_dec(&(part_stat_get(gendiskp, field)))
-#define part_stat_local_inc(gendiskp, field)				\
-	local_inc(&(part_stat_get(gendiskp, field)))
-#define part_stat_local_read(gendiskp, field)				\
-	local_read(&(part_stat_get(gendiskp, field)))
-#define part_stat_local_read_cpu(gendiskp, field, cpu)			\
-	local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
+#define part_stat_local_dec(part, field)				\
+	local_dec(&(part_stat_get(part, field)))
+#define part_stat_local_inc(part, field)				\
+	local_inc(&(part_stat_get(part, field)))
+#define part_stat_local_read(part, field)				\
+	local_read(&(part_stat_get(part, field)))
+#define part_stat_local_read_cpu(part, field, cpu)			\
+	local_read(&(part_stat_get_cpu(part, field, cpu)))
 
 #endif /* _LINUX_PART_STAT_H */
-- 
2.29.2

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  parent reply index

Thread overview: 99+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-28 16:14 [dm-devel] merge struct block_device and struct hd_struct v4 Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 01/45] blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 02/45] filemap: consistently use ->f_mapping over ->i_mapping Christoph Hellwig
2020-11-30  9:20   ` Johannes Thumshirn
2020-11-28 16:14 ` [dm-devel] [PATCH 03/45] fs: remove get_super_thawed and get_super_exclusive_thawed Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 04/45] fs: simplify freeze_bdev/thaw_bdev Christoph Hellwig
2020-11-30 17:55   ` Darrick J. Wong
2020-11-28 16:14 ` [dm-devel] [PATCH 05/45] mtip32xx: remove the call to fsync_bdev on removal Christoph Hellwig
2020-11-30  7:07   ` Hannes Reinecke
2020-11-30 14:48   ` Johannes Thumshirn
2020-11-28 16:14 ` [dm-devel] [PATCH 06/45] zram: do not call set_blocksize Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 07/45] loop: " Christoph Hellwig
2020-11-30  7:07   ` Hannes Reinecke
2020-11-30 11:26   ` Johannes Thumshirn
2020-11-28 16:14 ` [dm-devel] [PATCH 08/45] dm: simplify flush_bio initialization in __send_empty_flush Christoph Hellwig
2020-11-30  7:08   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 09/45] dm: remove the block_device reference in struct mapped_device Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 10/45] block: remove a duplicate __disk_get_part prototype Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 11/45] block: remove a superflous check in blkpg_do_ioctl Christoph Hellwig
2020-11-30  9:20   ` Johannes Thumshirn
2020-11-28 16:14 ` [dm-devel] [PATCH 12/45] block: add a bdev_kobj helper Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 13/45] block: use disk_part_iter_exit in disk_part_iter_next Christoph Hellwig
2020-11-28 16:14 ` [dm-devel] [PATCH 14/45] block: use put_device in put_disk Christoph Hellwig
2020-11-30  7:09   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 15/45] block: change the hash used for looking up block devices Christoph Hellwig
2020-11-30  7:10   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 16/45] block: switch bdgrab to use igrab Christoph Hellwig
2020-11-30  7:14   ` Hannes Reinecke
2020-11-30  9:09   ` Jan Kara
2020-11-30 14:52   ` Johannes Thumshirn
2020-11-28 16:14 ` [dm-devel] [PATCH 17/45] init: refactor name_to_dev_t Christoph Hellwig
2020-11-30  7:15   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 18/45] init: refactor devt_from_partuuid Christoph Hellwig
2020-11-30  7:16   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 19/45] init: cleanup match_dev_by_uuid and match_dev_by_label Christoph Hellwig
2020-11-30  7:17   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 20/45] block: refactor __blkdev_put Christoph Hellwig
2020-11-30  7:17   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 21/45] block: refactor blkdev_get Christoph Hellwig
2020-11-30  7:28   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 22/45] block: move bdput() to the callers of __blkdev_get Christoph Hellwig
2020-11-30  7:29   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 23/45] block: opencode devcgroup_inode_permission Christoph Hellwig
2020-11-30  7:30   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 24/45] block: remove i_bdev Christoph Hellwig
2020-11-30  7:31   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 25/45] block: simplify bdev/disk lookup in blkdev_get Christoph Hellwig
2020-11-30  7:36   ` Hannes Reinecke
2020-11-30  9:24   ` Jan Kara
2020-12-02 21:52   ` Tejun Heo
2020-11-28 16:14 ` [dm-devel] [PATCH 26/45] block: remove ->bd_contains Christoph Hellwig
2020-11-30  7:37   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 27/45] block: simplify the block device claiming interface Christoph Hellwig
2020-11-30  7:37   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 28/45] block: simplify part_to_disk Christoph Hellwig
2020-11-30  7:38   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 29/45] block: initialize struct block_device in bdev_alloc Christoph Hellwig
2020-11-30  7:38   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 30/45] block: remove the nr_sects field in struct hd_struct Christoph Hellwig
2020-11-30  7:39   ` Hannes Reinecke
2020-11-30  9:44   ` Jan Kara
2020-11-30 14:51     ` Christoph Hellwig
2020-11-30 15:17       ` Jan Kara
2020-11-28 16:14 ` Christoph Hellwig [this message]
2020-11-30  7:40   ` [dm-devel] [PATCH 31/45] block: move disk stat accounting to struct block_device Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 32/45] block: move the start_sect field " Christoph Hellwig
2020-11-30  7:41   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 33/45] block: move the partition_meta_info " Christoph Hellwig
2020-11-30  7:41   ` Hannes Reinecke
2020-11-28 16:14 ` [dm-devel] [PATCH 34/45] block: move holder_dir " Christoph Hellwig
2020-11-30  7:42   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 35/45] block: move make_it_fail " Christoph Hellwig
2020-11-30  7:43   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 36/45] block: move the policy field " Christoph Hellwig
2020-11-30  7:44   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 37/45] block: allocate struct hd_struct as part of struct bdev_inode Christoph Hellwig
2020-11-30  7:46   ` Hannes Reinecke
2020-11-30  9:53   ` Jan Kara
2020-11-28 16:15 ` [dm-devel] [PATCH 38/45] block: switch partition lookup to use struct block_device Christoph Hellwig
2020-11-30  7:47   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 39/45] block: remove the partno field from struct hd_struct Christoph Hellwig
2020-11-30  7:47   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 40/45] block: pass a block_device to blk_alloc_devt Christoph Hellwig
2020-11-30  7:48   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 41/45] block: pass a block_device to invalidate_partition Christoph Hellwig
2020-11-30  7:49   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 42/45] block: switch disk_part_iter_* to use a struct block_device Christoph Hellwig
2020-11-30  7:50   ` Hannes Reinecke
2020-11-30 10:20   ` Jan Kara
2020-11-28 16:15 ` [dm-devel] [PATCH 43/45] f2fs: remove a few bd_part checks Christoph Hellwig
2020-11-30  7:50   ` Hannes Reinecke
2020-11-28 16:15 ` [dm-devel] [PATCH 44/45] block: merge struct block_device and struct hd_struct Christoph Hellwig
2020-11-30  7:51   ` Hannes Reinecke
2020-11-30 10:29   ` Jan Kara
2020-11-28 16:15 ` [dm-devel] [PATCH 45/45] block: stop using bdget_disk for partition 0 Christoph Hellwig
2020-11-30  7:51   ` Hannes Reinecke
2020-11-30 17:19 ` [dm-devel] merge struct block_device and struct hd_struct v4 Christoph Hellwig
2020-11-30 17:51   ` Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2020-11-24 13:27 [dm-devel] merge struct block_device and struct hd_struct v2 Christoph Hellwig
2020-11-24 13:27 ` [dm-devel] [PATCH 31/45] block: move disk stat accounting to struct block_device Christoph Hellwig

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