Commit | Line | Data |
---|---|---|
279afbad KO |
1 | #ifndef _BCACHE_WRITEBACK_H |
2 | #define _BCACHE_WRITEBACK_H | |
3 | ||
72c27061 KO |
4 | #define CUTOFF_WRITEBACK 40 |
5 | #define CUTOFF_WRITEBACK_SYNC 70 | |
6 | ||
279afbad KO |
7 | static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d) |
8 | { | |
9 | uint64_t i, ret = 0; | |
10 | ||
11 | for (i = 0; i < d->nr_stripes; i++) | |
12 | ret += atomic_read(d->stripe_sectors_dirty + i); | |
13 | ||
14 | return ret; | |
15 | } | |
16 | ||
72c27061 KO |
17 | static inline bool bcache_dev_stripe_dirty(struct bcache_device *d, |
18 | uint64_t offset, | |
19 | unsigned nr_sectors) | |
20 | { | |
21 | uint64_t stripe = offset >> d->stripe_size_bits; | |
22 | ||
23 | while (1) { | |
24 | if (atomic_read(d->stripe_sectors_dirty + stripe)) | |
25 | return true; | |
26 | ||
27 | if (nr_sectors <= 1 << d->stripe_size_bits) | |
28 | return false; | |
29 | ||
30 | nr_sectors -= 1 << d->stripe_size_bits; | |
31 | stripe++; | |
32 | } | |
33 | } | |
34 | ||
35 | static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, | |
36 | unsigned cache_mode, bool would_skip) | |
37 | { | |
38 | unsigned in_use = dc->disk.c->gc_stats.in_use; | |
39 | ||
40 | if (cache_mode != CACHE_MODE_WRITEBACK || | |
41 | atomic_read(&dc->disk.detaching) || | |
42 | in_use > CUTOFF_WRITEBACK_SYNC) | |
43 | return false; | |
44 | ||
45 | if (dc->partial_stripes_expensive && | |
46 | bcache_dev_stripe_dirty(&dc->disk, bio->bi_sector, | |
47 | bio_sectors(bio))) | |
48 | return true; | |
49 | ||
50 | if (would_skip) | |
51 | return false; | |
52 | ||
53 | return bio->bi_rw & REQ_SYNC || | |
54 | in_use <= CUTOFF_WRITEBACK; | |
55 | } | |
56 | ||
279afbad KO |
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 *); | |
60 | ||
61 | void bch_sectors_dirty_init(struct cached_dev *dc); | |
62 | void bch_cached_dev_writeback_init(struct cached_dev *); | |
63 | ||
64 | #endif |