| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _BCACHE_WRITEBACK_H |
| #define _BCACHE_WRITEBACK_H |
| |
| #define CUTOFF_WRITEBACK 40 |
| #define CUTOFF_WRITEBACK_SYNC 70 |
| |
| 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 uint64_t bcache_flash_devs_sectors_dirty(struct cache_set *c) |
| { |
| uint64_t i, ret = 0; |
| |
| mutex_lock(&bch_register_lock); |
| |
| for (i = 0; i < c->nr_uuids; i++) { |
| struct bcache_device *d = c->devices[i]; |
| |
| if (!d || !UUID_FLASH_ONLY(&c->uuids[i])) |
| continue; |
| ret += bcache_dev_sectors_dirty(d); |
| } |
| |
| mutex_unlock(&bch_register_lock); |
| |
| return ret; |
| } |
| |
| static inline unsigned offset_to_stripe(struct bcache_device *d, |
| uint64_t offset) |
| { |
| do_div(offset, d->stripe_size); |
| return offset; |
| } |
| |
| static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc, |
| uint64_t offset, |
| unsigned nr_sectors) |
| { |
| unsigned stripe = offset_to_stripe(&dc->disk, offset); |
| |
| 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++; |
| } |
| } |
| |
| static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, |
| unsigned cache_mode, bool would_skip) |
| { |
| unsigned 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 > 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) || in_use <= 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)) { |
| atomic_inc(&dc->count); |
| |
| 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 *, unsigned, uint64_t, int); |
| |
| void bch_sectors_dirty_init(struct bcache_device *); |
| void bch_cached_dev_writeback_init(struct cached_dev *); |
| int bch_cached_dev_writeback_start(struct cached_dev *); |
| |
| #endif |