Release 4.16 drivers/md/bcache/writeback.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHE_WRITEBACK_H
#define _BCACHE_WRITEBACK_H
#define CUTOFF_WRITEBACK 40
#define CUTOFF_WRITEBACK_SYNC 70
#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
/*
* 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
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 48 | 100.00% | 1 | 100.00% |
| Total | 48 | 100.00% | 1 | 100.00% |
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->devices_max_used; 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| tang.junhui | 87 | 98.86% | 1 | 50.00% |
| Coly Li | 1 | 1.14% | 1 | 50.00% |
| Total | 88 | 100.00% | 2 | 100.00% |
static inline unsigned offset_to_stripe(struct bcache_device *d,
uint64_t offset)
{
do_div(offset, d->stripe_size);
return offset;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 27 | 100.00% | 3 | 100.00% |
| Total | 27 | 100.00% | 3 | 100.00% |
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++;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 77 | 100.00% | 3 | 100.00% |
| Total | 77 | 100.00% | 3 | 100.00% |
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 (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 <= CUTOFF_WRITEBACK);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 101 | 86.32% | 3 | 50.00% |
| Eric Wheeler | 12 | 10.26% | 1 | 16.67% |
| Christoph Hellwig | 3 | 2.56% | 1 | 16.67% |
| Jens Axboe | 1 | 0.85% | 1 | 16.67% |
| Total | 117 | 100.00% | 6 | 100.00% |
static inline void bch_writeback_queue(struct cached_dev *dc)
{
if (!IS_ERR_OR_NULL(dc->writeback_thread))
wake_up_process(dc->writeback_thread);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 19 | 65.52% | 2 | 66.67% |
| Stefan Bader | 10 | 34.48% | 1 | 33.33% |
| Total | 29 | 100.00% | 3 | 100.00% |
static inline void bch_writeback_add(struct cached_dev *dc)
{
if (!atomic_read(&dc->has_dirty) &&
!atomic_xchg(&dc->has_dirty, 1)) {
refcount_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);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 80 | 98.77% | 2 | 66.67% |
| Elena Reshetova | 1 | 1.23% | 1 | 33.33% |
| Total | 81 | 100.00% | 3 | 100.00% |
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
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Kent Overstreet | 396 | 72.79% | 7 | 35.00% |
| tang.junhui | 97 | 17.83% | 3 | 15.00% |
| Eric Wheeler | 12 | 2.21% | 1 | 5.00% |
| Stefan Bader | 10 | 1.84% | 1 | 5.00% |
| Slava Pestov | 9 | 1.65% | 1 | 5.00% |
| Coly Li | 9 | 1.65% | 2 | 10.00% |
| Michael Lyle | 5 | 0.92% | 1 | 5.00% |
| Christoph Hellwig | 3 | 0.55% | 1 | 5.00% |
| Greg Kroah-Hartman | 1 | 0.18% | 1 | 5.00% |
| Elena Reshetova | 1 | 0.18% | 1 | 5.00% |
| Jens Axboe | 1 | 0.18% | 1 | 5.00% |
| Total | 544 | 100.00% | 20 | 100.00% |
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