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https://github.com/koverstreet/bcachefs-tools.git
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123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
#ifndef _BCACHE_WRITEBACK_H
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#define _BCACHE_WRITEBACK_H
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#include "blockdev.h"
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#include "buckets.h"
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#define CUTOFF_WRITEBACK 60
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#define CUTOFF_WRITEBACK_SYNC 30
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static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
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{
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uint64_t i, ret = 0;
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for (i = 0; i < d->nr_stripes; i++)
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ret += atomic_read(d->stripe_sectors_dirty + i);
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return ret;
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}
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static inline unsigned offset_to_stripe(struct bcache_device *d,
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uint64_t offset)
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{
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do_div(offset, d->stripe_size);
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return offset;
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}
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static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
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uint64_t offset,
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unsigned nr_sectors)
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{
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unsigned stripe = offset_to_stripe(&dc->disk, offset);
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while (1) {
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if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
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return true;
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if (nr_sectors <= dc->disk.stripe_size)
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return false;
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nr_sectors -= dc->disk.stripe_size;
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stripe++;
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}
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}
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static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
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unsigned cache_mode, bool would_skip)
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{
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struct bch_fs *c = dc->disk.c;
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u64 available = sectors_available(c);
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if (cache_mode != CACHE_MODE_WRITEBACK ||
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test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
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available * 100 < c->capacity * CUTOFF_WRITEBACK_SYNC)
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return false;
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if (dc->partial_stripes_expensive &&
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bcache_dev_stripe_dirty(dc, bio->bi_iter.bi_sector,
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bio_sectors(bio)))
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return true;
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if (would_skip)
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return false;
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return bio->bi_opf & REQ_SYNC ||
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available * 100 < c->capacity * CUTOFF_WRITEBACK;
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}
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static inline void bch_writeback_queue(struct cached_dev *dc)
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{
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if (!IS_ERR_OR_NULL(dc->writeback_thread))
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wake_up_process(dc->writeback_thread);
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}
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static inline void bch_writeback_add(struct cached_dev *dc)
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{
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if (!atomic_read(&dc->has_dirty) &&
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!atomic_xchg(&dc->has_dirty, 1)) {
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atomic_inc(&dc->count);
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if (BDEV_STATE(dc->disk_sb.sb) != BDEV_STATE_DIRTY) {
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SET_BDEV_STATE(dc->disk_sb.sb, BDEV_STATE_DIRTY);
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/* XXX: should do this synchronously */
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bch_write_bdev_super(dc, NULL);
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}
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bch_writeback_queue(dc);
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}
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}
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#ifndef NO_BCACHE_WRITEBACK
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void bcache_dev_sectors_dirty_add(struct bch_fs *, unsigned, u64, int);
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void bch_writeback_recalc_oldest_gens(struct bch_fs *);
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void bch_sectors_dirty_init(struct cached_dev *, struct bch_fs *c);
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void bch_cached_dev_writeback_stop(struct cached_dev *);
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void bch_cached_dev_writeback_free(struct cached_dev *);
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int bch_cached_dev_writeback_init(struct cached_dev *);
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int bch_cached_dev_writeback_start(struct cached_dev *);
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#else
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static inline void bcache_dev_sectors_dirty_add(struct bch_fs *c,
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unsigned i, u64 o, int n) {}
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static inline void bch_writeback_recalc_oldest_gens(struct bch_fs *c) {}
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static inline void bch_sectors_dirty_init(struct cached_dev *dc,
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struct bch_fs *c) {}
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static inline void bch_cached_dev_writeback_stop(struct cached_dev *dc) {}
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static inline void bch_cached_dev_writeback_free(struct cached_dev *dc) {}
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static inline int bch_cached_dev_writeback_init(struct cached_dev *dc)
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{
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return 0;
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}
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static inline int bch_cached_dev_writeback_start(struct cached_dev *dc)
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{
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return 0;
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}
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#endif
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#endif
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