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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156/* SPDX-License-Identifier: GPL-2.0 */#ifndef _BCACHE_WRITEBACK_H#define _BCACHE_WRITEBACK_H
#define CUTOFF_WRITEBACK 40#define CUTOFF_WRITEBACK_SYNC 70
#define CUTOFF_WRITEBACK_MAX 70#define CUTOFF_WRITEBACK_SYNC_MAX 90
#define MAX_WRITEBACKS_IN_PASS 5#define MAX_WRITESIZE_IN_PASS 5000 /* *512b */
#define WRITEBACK_RATE_UPDATE_SECS_MAX 60#define WRITEBACK_RATE_UPDATE_SECS_DEFAULT 5
#define BCH_AUTO_GC_DIRTY_THRESHOLD 50
#define BCH_WRITEBACK_FRAGMENT_THRESHOLD_LOW 50#define BCH_WRITEBACK_FRAGMENT_THRESHOLD_MID 57#define BCH_WRITEBACK_FRAGMENT_THRESHOLD_HIGH 64
#define BCH_DIRTY_INIT_THRD_MAX 12/* * 14 (16384ths) is chosen here as something that each backing device * should be a reasonable fraction of the share, and not to blow up * until individual backing devices are a petabyte. */#define WRITEBACK_SHARE_SHIFT 14
struct bch_dirty_init_state;struct dirty_init_thrd_info { struct bch_dirty_init_state *state; struct task_struct *thread;};
struct bch_dirty_init_state { struct cache_set *c; struct bcache_device *d; int total_threads; int key_idx; spinlock_t idx_lock; atomic_t started; atomic_t enough; wait_queue_head_t wait; struct dirty_init_thrd_info infos[BCH_DIRTY_INIT_THRD_MAX];};
static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d){ uint64_t i, ret = 0;
for (i = 0; i < d->nr_stripes; i++) ret += atomic_read(d->stripe_sectors_dirty + i);
return ret;}
static inline int offset_to_stripe(struct bcache_device *d, uint64_t offset){ do_div(offset, d->stripe_size);
/* d->nr_stripes is in range [1, INT_MAX] */ if (unlikely(offset >= d->nr_stripes)) { pr_err("Invalid stripe %llu (>= nr_stripes %d).\n", offset, d->nr_stripes); return -EINVAL; }
/* * Here offset is definitly smaller than INT_MAX, * return it as int will never overflow. */ return offset;}
static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc, uint64_t offset, unsigned int nr_sectors){ int stripe = offset_to_stripe(&dc->disk, offset);
if (stripe < 0) return false;
while (1) { if (atomic_read(dc->disk.stripe_sectors_dirty + stripe)) return true;
if (nr_sectors <= dc->disk.stripe_size) return false;
nr_sectors -= dc->disk.stripe_size; stripe++; }}
extern unsigned int bch_cutoff_writeback;extern unsigned int bch_cutoff_writeback_sync;
static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, unsigned int cache_mode, bool would_skip){ unsigned int in_use = dc->disk.c->gc_stats.in_use;
if (cache_mode != CACHE_MODE_WRITEBACK || test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) || in_use > bch_cutoff_writeback_sync) return false;
if (bio_op(bio) == REQ_OP_DISCARD) return false;
if (dc->partial_stripes_expensive && bcache_dev_stripe_dirty(dc, bio->bi_iter.bi_sector, bio_sectors(bio))) return true;
if (would_skip) return false;
return (op_is_sync(bio->bi_opf) || bio->bi_opf & (REQ_META|REQ_PRIO) || in_use <= bch_cutoff_writeback);}
static inline void bch_writeback_queue(struct cached_dev *dc){ if (!IS_ERR_OR_NULL(dc->writeback_thread)) wake_up_process(dc->writeback_thread);}
static inline void bch_writeback_add(struct cached_dev *dc){ if (!atomic_read(&dc->has_dirty) && !atomic_xchg(&dc->has_dirty, 1)) { if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) { SET_BDEV_STATE(&dc->sb, BDEV_STATE_DIRTY); /* XXX: should do this synchronously */ bch_write_bdev_super(dc, NULL); }
bch_writeback_queue(dc); }}
void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned int inode, uint64_t offset, int nr_sectors);
void bch_sectors_dirty_init(struct bcache_device *d);void bch_cached_dev_writeback_init(struct cached_dev *dc);int bch_cached_dev_writeback_start(struct cached_dev *dc);
#endif