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155 lines
3.8 KiB
155 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _BCACHE_WRITEBACK_H |
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#define _BCACHE_WRITEBACK_H |
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#define CUTOFF_WRITEBACK 40 |
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#define CUTOFF_WRITEBACK_SYNC 70 |
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#define CUTOFF_WRITEBACK_MAX 70 |
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#define CUTOFF_WRITEBACK_SYNC_MAX 90 |
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#define MAX_WRITEBACKS_IN_PASS 5 |
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#define MAX_WRITESIZE_IN_PASS 5000 /* *512b */ |
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#define WRITEBACK_RATE_UPDATE_SECS_MAX 60 |
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#define WRITEBACK_RATE_UPDATE_SECS_DEFAULT 5 |
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#define BCH_AUTO_GC_DIRTY_THRESHOLD 50 |
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#define BCH_WRITEBACK_FRAGMENT_THRESHOLD_LOW 50 |
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#define BCH_WRITEBACK_FRAGMENT_THRESHOLD_MID 57 |
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#define BCH_WRITEBACK_FRAGMENT_THRESHOLD_HIGH 64 |
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#define BCH_DIRTY_INIT_THRD_MAX 64 |
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/* |
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* 14 (16384ths) is chosen here as something that each backing device |
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* should be a reasonable fraction of the share, and not to blow up |
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* until individual backing devices are a petabyte. |
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*/ |
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#define WRITEBACK_SHARE_SHIFT 14 |
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struct bch_dirty_init_state; |
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struct dirty_init_thrd_info { |
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struct bch_dirty_init_state *state; |
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struct task_struct *thread; |
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}; |
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struct bch_dirty_init_state { |
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struct cache_set *c; |
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struct bcache_device *d; |
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int total_threads; |
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int key_idx; |
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spinlock_t idx_lock; |
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atomic_t started; |
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atomic_t enough; |
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wait_queue_head_t wait; |
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struct dirty_init_thrd_info infos[BCH_DIRTY_INIT_THRD_MAX]; |
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}; |
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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 int 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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/* d->nr_stripes is in range [1, INT_MAX] */ |
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if (unlikely(offset >= d->nr_stripes)) { |
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pr_err("Invalid stripe %llu (>= nr_stripes %d).\n", |
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offset, d->nr_stripes); |
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return -EINVAL; |
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} |
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/* |
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* Here offset is definitly smaller than INT_MAX, |
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* return it as int will never overflow. |
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*/ |
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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 int nr_sectors) |
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{ |
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int stripe = offset_to_stripe(&dc->disk, offset); |
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if (stripe < 0) |
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return false; |
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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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extern unsigned int bch_cutoff_writeback; |
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extern unsigned int bch_cutoff_writeback_sync; |
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static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, |
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unsigned int cache_mode, bool would_skip) |
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{ |
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unsigned int in_use = dc->disk.c->gc_stats.in_use; |
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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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in_use > bch_cutoff_writeback_sync) |
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return false; |
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if (bio_op(bio) == REQ_OP_DISCARD) |
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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 (op_is_sync(bio->bi_opf) || |
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bio->bi_opf & (REQ_META|REQ_PRIO) || |
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in_use <= bch_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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if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) { |
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SET_BDEV_STATE(&dc->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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void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned int inode, |
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uint64_t offset, int nr_sectors); |
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void bch_sectors_dirty_init(struct bcache_device *d); |
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void bch_cached_dev_writeback_init(struct cached_dev *dc); |
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int bch_cached_dev_writeback_start(struct cached_dev *dc); |
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#endif
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