[mirror_ubuntu-jammy-kernel.git] / drivers / md / bcache / writeback.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHE_WRITEBACK_H
#define _BCACHE_WRITEBACK_H

#define CUTOFF_WRITEBACK	40
#define CUTOFF_WRITEBACK_SYNC	70

static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
{
	uint64_t i, ret = 0;

	for (i = 0; i < d->nr_stripes; i++)
		ret += atomic_read(d->stripe_sectors_dirty + i);

	return ret;
}

static inline uint64_t  bcache_flash_devs_sectors_dirty(struct cache_set *c)
{
	uint64_t i, ret = 0;

	mutex_lock(&bch_register_lock);

	for (i = 0; i < c->nr_uuids; i++) {
		struct bcache_device *d = c->devices[i];

		if (!d || !UUID_FLASH_ONLY(&c->uuids[i]))
			continue;
	   ret += bcache_dev_sectors_dirty(d);
	}

	mutex_unlock(&bch_register_lock);

	return ret;
}

static inline unsigned offset_to_stripe(struct bcache_device *d,
					uint64_t offset)
{
	do_div(offset, d->stripe_size);
	return offset;
}

static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
					   uint64_t offset,
					   unsigned nr_sectors)
{
	unsigned stripe = offset_to_stripe(&dc->disk, offset);

	while (1) {
		if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
			return true;

		if (nr_sectors <= dc->disk.stripe_size)
			return false;

		nr_sectors -= dc->disk.stripe_size;
		stripe++;
	}
}

static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
				    unsigned cache_mode, bool would_skip)
{
	unsigned in_use = dc->disk.c->gc_stats.in_use;

	if (cache_mode != CACHE_MODE_WRITEBACK ||
	    test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
	    in_use > CUTOFF_WRITEBACK_SYNC)
		return false;

	if (dc->partial_stripes_expensive &&
	    bcache_dev_stripe_dirty(dc, bio->bi_iter.bi_sector,
				    bio_sectors(bio)))
		return true;

	if (would_skip)
		return false;

	return op_is_sync(bio->bi_opf) || in_use <= CUTOFF_WRITEBACK;
}

static inline void bch_writeback_queue(struct cached_dev *dc)
{
	if (!IS_ERR_OR_NULL(dc->writeback_thread))
		wake_up_process(dc->writeback_thread);
}

static inline void bch_writeback_add(struct cached_dev *dc)
{
	if (!atomic_read(&dc->has_dirty) &&
	    !atomic_xchg(&dc->has_dirty, 1)) {
		atomic_inc(&dc->count);

		if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) {
			SET_BDEV_STATE(&dc->sb, BDEV_STATE_DIRTY);
			/* XXX: should do this synchronously */
			bch_write_bdev_super(dc, NULL);
		}

		bch_writeback_queue(dc);
	}
}

void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);

void bch_sectors_dirty_init(struct bcache_device *);
void bch_cached_dev_writeback_init(struct cached_dev *);
int bch_cached_dev_writeback_start(struct cached_dev *);

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
279afbad KO	2	#ifndef _BCACHE_WRITEBACK_H
	3	#define _BCACHE_WRITEBACK_H
	4
72c27061 KO	5	#define CUTOFF_WRITEBACK 40
	6	#define CUTOFF_WRITEBACK_SYNC 70
	7
279afbad KO	8	static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
	9	{
	10	uint64_t i, ret = 0;
	11
	12	for (i = 0; i < d->nr_stripes; i++)
	13	ret += atomic_read(d->stripe_sectors_dirty + i);
	14
	15	return ret;
	16	}
	17
a8394090 TJ	18	static inline uint64_t bcache_flash_devs_sectors_dirty(struct cache_set *c)
	19	{
	20	uint64_t i, ret = 0;
	21
	22	mutex_lock(&bch_register_lock);
	23
	24	for (i = 0; i < c->nr_uuids; i++) {
	25	struct bcache_device *d = c->devices[i];
	26
	27	if (!d \|\| !UUID_FLASH_ONLY(&c->uuids[i]))
	28	continue;
	29	ret += bcache_dev_sectors_dirty(d);
	30	}
	31
	32	mutex_unlock(&bch_register_lock);
	33
	34	return ret;
	35	}
	36
48a915a8 KO	37	static inline unsigned offset_to_stripe(struct bcache_device *d,
	38	uint64_t offset)
	39	{
	40	do_div(offset, d->stripe_size);
	41	return offset;
	42	}
	43
	44	static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
72c27061 KO	45	uint64_t offset,
	46	unsigned nr_sectors)
	47	{
48a915a8	48	unsigned stripe = offset_to_stripe(&dc->disk, offset);
72c27061 KO	49
72c27061 KO	50	while (1) {
48a915a8	51	if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
72c27061 KO	52	return true;
72c27061 KO	53
48a915a8	54	if (nr_sectors <= dc->disk.stripe_size)
72c27061 KO	55	return false;
72c27061 KO	56
48a915a8	57	nr_sectors -= dc->disk.stripe_size;
72c27061 KO	58	stripe++;
	59	}
	60	}
	61
	62	static inline bool should_writeback(struct cached_dev dc, struct bio bio,
	63	unsigned cache_mode, bool would_skip)
	64	{
	65	unsigned in_use = dc->disk.c->gc_stats.in_use;
	66
	67	if (cache_mode != CACHE_MODE_WRITEBACK \|\|
c4d951dd	68	test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) \|\|
72c27061 KO	69	in_use > CUTOFF_WRITEBACK_SYNC)
	70	return false;
	71
	72	if (dc->partial_stripes_expensive &&
4f024f37	73	bcache_dev_stripe_dirty(dc, bio->bi_iter.bi_sector,
72c27061 KO	74	bio_sectors(bio)))
	75	return true;
	76
	77	if (would_skip)
	78	return false;
	79
83b5df67	80	return op_is_sync(bio->bi_opf) \|\| in_use <= CUTOFF_WRITEBACK;
72c27061 KO	81	}
72c27061 KO	82
5e6926da KO	83	static inline void bch_writeback_queue(struct cached_dev *dc)
5e6926da KO	84	{
8d16ce54 SB	85	if (!IS_ERR_OR_NULL(dc->writeback_thread))
8d16ce54 SB	86	wake_up_process(dc->writeback_thread);
5e6926da KO	87	}
	88
	89	static inline void bch_writeback_add(struct cached_dev *dc)
	90	{
	91	if (!atomic_read(&dc->has_dirty) &&
	92	!atomic_xchg(&dc->has_dirty, 1)) {
	93	atomic_inc(&dc->count);
	94
	95	if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) {
	96	SET_BDEV_STATE(&dc->sb, BDEV_STATE_DIRTY);
	97	/* XXX: should do this synchronously */
	98	bch_write_bdev_super(dc, NULL);
	99	}
	100
	101	bch_writeback_queue(dc);
	102	}
	103	}
	104
279afbad	105	void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);
279afbad	106
175206cf	107	void bch_sectors_dirty_init(struct bcache_device *);
9e5c3535 SP	108	void bch_cached_dev_writeback_init(struct cached_dev *);
9e5c3535 SP	109	int bch_cached_dev_writeback_start(struct cached_dev *);
279afbad KO	110
279afbad KO	111	#endif