6054c6d4da
When we convert bch_btree_insert() to bch_btree_map_leaf_nodes(), we won't be passing struct btree_op to bch_btree_insert() anymore - so we need a different way of returning whether there was a collision (really, a replace collision). Signed-off-by: Kent Overstreet <kmo@daterainc.com>
248 lines
5.2 KiB
C
248 lines
5.2 KiB
C
/*
|
|
* Moving/copying garbage collector
|
|
*
|
|
* Copyright 2012 Google, Inc.
|
|
*/
|
|
|
|
#include "bcache.h"
|
|
#include "btree.h"
|
|
#include "debug.h"
|
|
#include "request.h"
|
|
|
|
#include <trace/events/bcache.h>
|
|
|
|
struct moving_io {
|
|
struct keybuf_key *w;
|
|
struct search s;
|
|
struct bbio bio;
|
|
};
|
|
|
|
static bool moving_pred(struct keybuf *buf, struct bkey *k)
|
|
{
|
|
struct cache_set *c = container_of(buf, struct cache_set,
|
|
moving_gc_keys);
|
|
unsigned i;
|
|
|
|
for (i = 0; i < KEY_PTRS(k); i++) {
|
|
struct cache *ca = PTR_CACHE(c, k, i);
|
|
struct bucket *g = PTR_BUCKET(c, k, i);
|
|
|
|
if (GC_SECTORS_USED(g) < ca->gc_move_threshold)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Moving GC - IO loop */
|
|
|
|
static void moving_io_destructor(struct closure *cl)
|
|
{
|
|
struct moving_io *io = container_of(cl, struct moving_io, s.cl);
|
|
kfree(io);
|
|
}
|
|
|
|
static void write_moving_finish(struct closure *cl)
|
|
{
|
|
struct moving_io *io = container_of(cl, struct moving_io, s.cl);
|
|
struct bio *bio = &io->bio.bio;
|
|
struct bio_vec *bv;
|
|
int i;
|
|
|
|
bio_for_each_segment_all(bv, bio, i)
|
|
__free_page(bv->bv_page);
|
|
|
|
if (io->s.insert_collision)
|
|
trace_bcache_gc_copy_collision(&io->w->key);
|
|
|
|
bch_keybuf_del(&io->s.c->moving_gc_keys, io->w);
|
|
|
|
up(&io->s.c->moving_in_flight);
|
|
|
|
closure_return_with_destructor(cl, moving_io_destructor);
|
|
}
|
|
|
|
static void read_moving_endio(struct bio *bio, int error)
|
|
{
|
|
struct moving_io *io = container_of(bio->bi_private,
|
|
struct moving_io, s.cl);
|
|
|
|
if (error)
|
|
io->s.error = error;
|
|
|
|
bch_bbio_endio(io->s.c, bio, error, "reading data to move");
|
|
}
|
|
|
|
static void moving_init(struct moving_io *io)
|
|
{
|
|
struct bio *bio = &io->bio.bio;
|
|
|
|
bio_init(bio);
|
|
bio_get(bio);
|
|
bio_set_prio(bio, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
|
|
|
|
bio->bi_size = KEY_SIZE(&io->w->key) << 9;
|
|
bio->bi_max_vecs = DIV_ROUND_UP(KEY_SIZE(&io->w->key),
|
|
PAGE_SECTORS);
|
|
bio->bi_private = &io->s.cl;
|
|
bio->bi_io_vec = bio->bi_inline_vecs;
|
|
bch_bio_map(bio, NULL);
|
|
}
|
|
|
|
static void write_moving(struct closure *cl)
|
|
{
|
|
struct search *s = container_of(cl, struct search, cl);
|
|
struct moving_io *io = container_of(s, struct moving_io, s);
|
|
|
|
if (!s->error) {
|
|
moving_init(io);
|
|
|
|
io->bio.bio.bi_sector = KEY_START(&io->w->key);
|
|
s->op.lock = -1;
|
|
s->write_prio = 1;
|
|
s->cache_bio = &io->bio.bio;
|
|
|
|
s->writeback = KEY_DIRTY(&io->w->key);
|
|
s->csum = KEY_CSUM(&io->w->key);
|
|
|
|
bkey_copy(&s->replace_key, &io->w->key);
|
|
s->replace = true;
|
|
|
|
closure_init(&s->btree, cl);
|
|
bch_data_insert(&s->btree);
|
|
}
|
|
|
|
continue_at(cl, write_moving_finish, system_wq);
|
|
}
|
|
|
|
static void read_moving_submit(struct closure *cl)
|
|
{
|
|
struct search *s = container_of(cl, struct search, cl);
|
|
struct moving_io *io = container_of(s, struct moving_io, s);
|
|
struct bio *bio = &io->bio.bio;
|
|
|
|
bch_submit_bbio(bio, s->c, &io->w->key, 0);
|
|
|
|
continue_at(cl, write_moving, system_wq);
|
|
}
|
|
|
|
static void read_moving(struct cache_set *c)
|
|
{
|
|
struct keybuf_key *w;
|
|
struct moving_io *io;
|
|
struct bio *bio;
|
|
struct closure cl;
|
|
|
|
closure_init_stack(&cl);
|
|
|
|
/* XXX: if we error, background writeback could stall indefinitely */
|
|
|
|
while (!test_bit(CACHE_SET_STOPPING, &c->flags)) {
|
|
w = bch_keybuf_next_rescan(c, &c->moving_gc_keys,
|
|
&MAX_KEY, moving_pred);
|
|
if (!w)
|
|
break;
|
|
|
|
io = kzalloc(sizeof(struct moving_io) + sizeof(struct bio_vec)
|
|
* DIV_ROUND_UP(KEY_SIZE(&w->key), PAGE_SECTORS),
|
|
GFP_KERNEL);
|
|
if (!io)
|
|
goto err;
|
|
|
|
w->private = io;
|
|
io->w = w;
|
|
io->s.inode = KEY_INODE(&w->key);
|
|
io->s.c = c;
|
|
|
|
moving_init(io);
|
|
bio = &io->bio.bio;
|
|
|
|
bio->bi_rw = READ;
|
|
bio->bi_end_io = read_moving_endio;
|
|
|
|
if (bio_alloc_pages(bio, GFP_KERNEL))
|
|
goto err;
|
|
|
|
trace_bcache_gc_copy(&w->key);
|
|
|
|
down(&c->moving_in_flight);
|
|
closure_call(&io->s.cl, read_moving_submit, NULL, &cl);
|
|
}
|
|
|
|
if (0) {
|
|
err: if (!IS_ERR_OR_NULL(w->private))
|
|
kfree(w->private);
|
|
|
|
bch_keybuf_del(&c->moving_gc_keys, w);
|
|
}
|
|
|
|
closure_sync(&cl);
|
|
}
|
|
|
|
static bool bucket_cmp(struct bucket *l, struct bucket *r)
|
|
{
|
|
return GC_SECTORS_USED(l) < GC_SECTORS_USED(r);
|
|
}
|
|
|
|
static unsigned bucket_heap_top(struct cache *ca)
|
|
{
|
|
return GC_SECTORS_USED(heap_peek(&ca->heap));
|
|
}
|
|
|
|
void bch_moving_gc(struct cache_set *c)
|
|
{
|
|
struct cache *ca;
|
|
struct bucket *b;
|
|
unsigned i;
|
|
|
|
if (!c->copy_gc_enabled)
|
|
return;
|
|
|
|
mutex_lock(&c->bucket_lock);
|
|
|
|
for_each_cache(ca, c, i) {
|
|
unsigned sectors_to_move = 0;
|
|
unsigned reserve_sectors = ca->sb.bucket_size *
|
|
min(fifo_used(&ca->free), ca->free.size / 2);
|
|
|
|
ca->heap.used = 0;
|
|
|
|
for_each_bucket(b, ca) {
|
|
if (!GC_SECTORS_USED(b))
|
|
continue;
|
|
|
|
if (!heap_full(&ca->heap)) {
|
|
sectors_to_move += GC_SECTORS_USED(b);
|
|
heap_add(&ca->heap, b, bucket_cmp);
|
|
} else if (bucket_cmp(b, heap_peek(&ca->heap))) {
|
|
sectors_to_move -= bucket_heap_top(ca);
|
|
sectors_to_move += GC_SECTORS_USED(b);
|
|
|
|
ca->heap.data[0] = b;
|
|
heap_sift(&ca->heap, 0, bucket_cmp);
|
|
}
|
|
}
|
|
|
|
while (sectors_to_move > reserve_sectors) {
|
|
heap_pop(&ca->heap, b, bucket_cmp);
|
|
sectors_to_move -= GC_SECTORS_USED(b);
|
|
}
|
|
|
|
ca->gc_move_threshold = bucket_heap_top(ca);
|
|
|
|
pr_debug("threshold %u", ca->gc_move_threshold);
|
|
}
|
|
|
|
mutex_unlock(&c->bucket_lock);
|
|
|
|
c->moving_gc_keys.last_scanned = ZERO_KEY;
|
|
|
|
read_moving(c);
|
|
}
|
|
|
|
void bch_moving_init_cache_set(struct cache_set *c)
|
|
{
|
|
bch_keybuf_init(&c->moving_gc_keys);
|
|
sema_init(&c->moving_in_flight, 64);
|
|
}
|