1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHE_WRITEBACK_H
3 #define _BCACHE_WRITEBACK_H
5 #define CUTOFF_WRITEBACK 40
6 #define CUTOFF_WRITEBACK_SYNC 70
8 static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
12 for (i = 0; i < d->nr_stripes; i++)
13 ret += atomic_read(d->stripe_sectors_dirty + i);
18 static inline uint64_t bcache_flash_devs_sectors_dirty(struct cache_set *c)
22 mutex_lock(&bch_register_lock);
24 for (i = 0; i < c->nr_uuids; i++) {
25 struct bcache_device *d = c->devices[i];
27 if (!d || !UUID_FLASH_ONLY(&c->uuids[i]))
29 ret += bcache_dev_sectors_dirty(d);
32 mutex_unlock(&bch_register_lock);
37 static inline unsigned offset_to_stripe(struct bcache_device *d,
40 do_div(offset, d->stripe_size);
44 static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
48 unsigned stripe = offset_to_stripe(&dc->disk, offset);
51 if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
54 if (nr_sectors <= dc->disk.stripe_size)
57 nr_sectors -= dc->disk.stripe_size;
62 static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
63 unsigned cache_mode, bool would_skip)
65 unsigned in_use = dc->disk.c->gc_stats.in_use;
67 if (cache_mode != CACHE_MODE_WRITEBACK ||
68 test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
69 in_use > CUTOFF_WRITEBACK_SYNC)
72 if (bio_op(bio) == REQ_OP_DISCARD)
75 if (dc->partial_stripes_expensive &&
76 bcache_dev_stripe_dirty(dc, bio->bi_iter.bi_sector,
83 return op_is_sync(bio->bi_opf) || in_use <= CUTOFF_WRITEBACK;
86 static inline void bch_writeback_queue(struct cached_dev *dc)
88 if (!IS_ERR_OR_NULL(dc->writeback_thread))
89 wake_up_process(dc->writeback_thread);
92 static inline void bch_writeback_add(struct cached_dev *dc)
94 if (!atomic_read(&dc->has_dirty) &&
95 !atomic_xchg(&dc->has_dirty, 1)) {
96 atomic_inc(&dc->count);
98 if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) {
99 SET_BDEV_STATE(&dc->sb, BDEV_STATE_DIRTY);
100 /* XXX: should do this synchronously */
101 bch_write_bdev_super(dc, NULL);
104 bch_writeback_queue(dc);
108 void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);
110 void bch_sectors_dirty_init(struct bcache_device *);
111 void bch_cached_dev_writeback_init(struct cached_dev *);
112 int bch_cached_dev_writeback_start(struct cached_dev *);