1 #ifndef _BCACHE_WRITEBACK_H
2 #define _BCACHE_WRITEBACK_H
4 #define CUTOFF_WRITEBACK 40
5 #define CUTOFF_WRITEBACK_SYNC 70
7 static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
11 for (i = 0; i < d->nr_stripes; i++)
12 ret += atomic_read(d->stripe_sectors_dirty + i);
17 static inline bool bcache_dev_stripe_dirty(struct bcache_device *d,
21 uint64_t stripe = offset >> d->stripe_size_bits;
24 if (atomic_read(d->stripe_sectors_dirty + stripe))
27 if (nr_sectors <= 1 << d->stripe_size_bits)
30 nr_sectors -= 1 << d->stripe_size_bits;
35 static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
36 unsigned cache_mode, bool would_skip)
38 unsigned in_use = dc->disk.c->gc_stats.in_use;
40 if (cache_mode != CACHE_MODE_WRITEBACK ||
41 atomic_read(&dc->disk.detaching) ||
42 in_use > CUTOFF_WRITEBACK_SYNC)
45 if (dc->partial_stripes_expensive &&
46 bcache_dev_stripe_dirty(&dc->disk, bio->bi_sector,
53 return bio->bi_rw & REQ_SYNC ||
54 in_use <= CUTOFF_WRITEBACK;
57 void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);
58 void bch_writeback_queue(struct cached_dev *);
59 void bch_writeback_add(struct cached_dev *);
61 void bch_sectors_dirty_init(struct cached_dev *dc);
62 void bch_cached_dev_writeback_init(struct cached_dev *);