#include "alloc_foreground.h"
#include "btree_iter.h"
#include "btree_update.h"
+#include "btree_write_buffer.h"
#include "buckets.h"
#include "clock.h"
#include "disk_groups.h"
+#include "errcode.h"
#include "error.h"
#include "extents.h"
#include "eytzinger.h"
#include "io.h"
#include "keylist.h"
+#include "lru.h"
#include "move.h"
#include "movinggc.h"
#include "super-io.h"
#include <linux/sort.h>
#include <linux/wait.h>
-static int bucket_offset_cmp(const void *_l, const void *_r, size_t size)
+static int bch2_bucket_is_movable(struct btree_trans *trans,
+ struct bpos bucket, u64 time, u8 *gen)
{
- const struct copygc_heap_entry *l = _l;
- const struct copygc_heap_entry *r = _r;
-
- return cmp_int(l->dev, r->dev) ?:
- cmp_int(l->offset, r->offset);
-}
-
-static enum data_cmd copygc_pred(struct bch_fs *c, void *arg,
- struct bkey_s_c k,
- struct bch_io_opts *io_opts,
- struct data_opts *data_opts)
-{
- copygc_heap *h = &c->copygc_heap;
- struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
- const union bch_extent_entry *entry;
- struct extent_ptr_decoded p = { 0 };
-
- bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, p.ptr.dev);
- struct copygc_heap_entry search = {
- .dev = p.ptr.dev,
- .offset = p.ptr.offset,
- };
- ssize_t i;
-
- if (p.ptr.cached)
- continue;
-
- i = eytzinger0_find_le(h->data, h->used,
- sizeof(h->data[0]),
- bucket_offset_cmp, &search);
-#if 0
- /* eytzinger search verify code: */
- ssize_t j = -1, k;
-
- for (k = 0; k < h->used; k++)
- if (h->data[k].offset <= ptr->offset &&
- (j < 0 || h->data[k].offset > h->data[j].offset))
- j = k;
-
- BUG_ON(i != j);
-#endif
- if (i >= 0 &&
- p.ptr.dev == h->data[i].dev &&
- p.ptr.offset < h->data[i].offset + ca->mi.bucket_size &&
- p.ptr.gen == h->data[i].gen) {
- /*
- * We need to use the journal reserve here, because
- * - journal reclaim depends on btree key cache
- * flushing to make forward progress,
- * - which has to make forward progress when the
- * journal is pre-reservation full,
- * - and depends on allocation - meaning allocator and
- * copygc
- */
-
- data_opts->target = io_opts->background_target;
- data_opts->nr_replicas = 1;
- data_opts->btree_insert_flags = BTREE_INSERT_USE_RESERVE|
- JOURNAL_WATERMARK_copygc;
- data_opts->rewrite_dev = p.ptr.dev;
-
- if (p.has_ec)
- data_opts->nr_replicas += p.ec.redundancy;
-
- return DATA_REWRITE;
- }
- }
-
- return DATA_SKIP;
-}
-
-static inline int fragmentation_cmp(copygc_heap *heap,
- struct copygc_heap_entry l,
- struct copygc_heap_entry r)
-{
- return cmp_int(l.fragmentation, r.fragmentation);
-}
-
-static int walk_buckets_to_copygc(struct bch_fs *c)
-{
- copygc_heap *h = &c->copygc_heap;
- struct btree_trans trans;
struct btree_iter iter;
struct bkey_s_c k;
- struct bch_alloc_v4 a;
+ struct bch_alloc_v4 _a;
+ const struct bch_alloc_v4 *a;
int ret;
- bch2_trans_init(&trans, c, 0, 0);
+ if (bch2_bucket_is_open(trans->c, bucket.inode, bucket.offset))
+ return 0;
- for_each_btree_key(&trans, iter, BTREE_ID_alloc, POS_MIN,
- BTREE_ITER_PREFETCH, k, ret) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, iter.pos.inode);
- struct copygc_heap_entry e;
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, bucket, 0);
+ k = bch2_btree_iter_peek_slot(&iter);
+ ret = bkey_err(k);
+ bch2_trans_iter_exit(trans, &iter);
- bch2_alloc_to_v4(k, &a);
+ if (ret)
+ return ret;
- if (a.data_type != BCH_DATA_user ||
- a.dirty_sectors >= ca->mi.bucket_size ||
- bch2_bucket_is_open(c, iter.pos.inode, iter.pos.offset))
- continue;
+ a = bch2_alloc_to_v4(k, &_a);
+ *gen = a->gen;
+ ret = (a->data_type == BCH_DATA_btree ||
+ a->data_type == BCH_DATA_user) &&
+ a->fragmentation_lru &&
+ a->fragmentation_lru <= time;
- e = (struct copygc_heap_entry) {
- .dev = iter.pos.inode,
- .gen = a.gen,
- .replicas = 1 + a.stripe_redundancy,
- .fragmentation = (u64) a.dirty_sectors * (1ULL << 31)
- / ca->mi.bucket_size,
- .sectors = a.dirty_sectors,
- .offset = bucket_to_sector(ca, iter.pos.offset),
- };
- heap_add_or_replace(h, e, -fragmentation_cmp, NULL);
+ if (ret) {
+ struct printbuf buf = PRINTBUF;
+ bch2_bkey_val_to_text(&buf, trans->c, k);
+ pr_debug("%s", buf.buf);
+ printbuf_exit(&buf);
}
- bch2_trans_iter_exit(&trans, &iter);
- bch2_trans_exit(&trans);
return ret;
}
-static int bucket_inorder_cmp(const void *_l, const void *_r)
+static int bch2_copygc_next_bucket(struct btree_trans *trans,
+ struct bpos *bucket, u8 *gen, struct bpos *pos)
{
- const struct copygc_heap_entry *l = _l;
- const struct copygc_heap_entry *r = _r;
-
- return cmp_int(l->dev, r->dev) ?: cmp_int(l->offset, r->offset);
-}
-
-static int check_copygc_was_done(struct bch_fs *c,
- u64 *sectors_not_moved,
- u64 *buckets_not_moved)
-{
- copygc_heap *h = &c->copygc_heap;
- struct btree_trans trans;
struct btree_iter iter;
struct bkey_s_c k;
- struct bch_alloc_v4 a;
- struct copygc_heap_entry *i;
- int ret = 0;
-
- sort(h->data, h->used, sizeof(h->data[0]), bucket_inorder_cmp, NULL);
-
- bch2_trans_init(&trans, c, 0, 0);
- bch2_trans_iter_init(&trans, &iter, BTREE_ID_alloc, POS_MIN, 0);
-
- for (i = h->data; i < h->data + h->used; i++) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, i->dev);
-
- bch2_btree_iter_set_pos(&iter, POS(i->dev, sector_to_bucket(ca, i->offset)));
-
- ret = lockrestart_do(&trans,
- bkey_err(k = bch2_btree_iter_peek_slot(&iter)));
- if (ret)
- break;
+ int ret;
- bch2_alloc_to_v4(k, &a);
+ ret = for_each_btree_key2_upto(trans, iter, BTREE_ID_lru,
+ bpos_max(*pos, lru_pos(BCH_LRU_FRAGMENTATION_START, 0, 0)),
+ lru_pos(BCH_LRU_FRAGMENTATION_START, U64_MAX, LRU_TIME_MAX),
+ 0, k, ({
+ *bucket = u64_to_bucket(k.k->p.offset);
- if (a.gen == i->gen && a.dirty_sectors) {
- *sectors_not_moved += a.dirty_sectors;
- *buckets_not_moved += 1;
- }
- }
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_bucket_is_movable(trans, *bucket, lru_pos_time(k.k->p), gen);
+ }));
- bch2_trans_exit(&trans);
- return ret;
+ *pos = iter.pos;
+ if (ret < 0)
+ return ret;
+ return ret ? 0 : -ENOENT;
}
static int bch2_copygc(struct bch_fs *c)
{
- copygc_heap *h = &c->copygc_heap;
- struct copygc_heap_entry e, *i;
struct bch_move_stats move_stats;
- u64 sectors_to_move = 0, sectors_to_write = 0, sectors_not_moved = 0;
- u64 sectors_reserved = 0;
- u64 buckets_to_move, buckets_not_moved = 0;
- struct bch_dev *ca;
- unsigned dev_idx;
- size_t heap_size = 0;
- int ret;
-
- bch_move_stats_init(&move_stats, "copygc");
-
- /*
- * Find buckets with lowest sector counts, skipping completely
- * empty buckets, by building a maxheap sorted by sector count,
- * and repeatedly replacing the maximum element until all
- * buckets have been visited.
- */
- h->used = 0;
-
- for_each_rw_member(ca, c, dev_idx)
- heap_size += ca->mi.nbuckets >> 7;
-
- if (h->size < heap_size) {
- free_heap(&c->copygc_heap);
- if (!init_heap(&c->copygc_heap, heap_size, GFP_KERNEL)) {
- bch_err(c, "error allocating copygc heap");
- return 0;
- }
- }
-
- for_each_rw_member(ca, c, dev_idx) {
- s64 avail = min(dev_buckets_available(ca, RESERVE_movinggc),
- ca->mi.nbuckets >> 6);
-
- sectors_reserved += avail * ca->mi.bucket_size;
- }
-
- ret = walk_buckets_to_copygc(c);
- if (ret) {
- bch2_fs_fatal_error(c, "error walking buckets to copygc!");
- return ret;
- }
-
- if (!h->used) {
- bch_err_ratelimited(c, "copygc requested to run but found no buckets to move!");
- return 0;
- }
+ struct btree_trans trans;
+ struct moving_context ctxt;
+ struct data_update_opts data_opts = {
+ .btree_insert_flags = BTREE_INSERT_USE_RESERVE|JOURNAL_WATERMARK_copygc,
+ };
+ struct bpos bucket;
+ struct bpos pos;
+ u8 gen = 0;
+ unsigned nr_evacuated;
+ int ret = 0;
- /*
- * Our btree node allocations also come out of RESERVE_movingc:
- */
- sectors_reserved = (sectors_reserved * 3) / 4;
- if (!sectors_reserved) {
- bch2_fs_fatal_error(c, "stuck, ran out of copygc reserve!");
- return -1;
- }
+ bch2_move_stats_init(&move_stats, "copygc");
+ bch2_moving_ctxt_init(&ctxt, c, NULL, &move_stats,
+ writepoint_ptr(&c->copygc_write_point),
+ false);
+ bch2_trans_init(&trans, c, 0, 0);
- for (i = h->data; i < h->data + h->used; i++) {
- sectors_to_move += i->sectors;
- sectors_to_write += i->sectors * i->replicas;
- }
+ ret = bch2_btree_write_buffer_flush(&trans);
+ BUG_ON(ret);
- while (sectors_to_write > sectors_reserved) {
- BUG_ON(!heap_pop(h, e, -fragmentation_cmp, NULL));
- sectors_to_write -= e.sectors * e.replicas;
+ for (nr_evacuated = 0, pos = POS_MIN;
+ nr_evacuated < 32 && !ret;
+ nr_evacuated++, pos = bpos_nosnap_successor(pos)) {
+ ret = bch2_copygc_next_bucket(&trans, &bucket, &gen, &pos) ?:
+ __bch2_evacuate_bucket(&trans, &ctxt, bucket, gen, data_opts);
+ if (bkey_eq(pos, POS_MAX))
+ break;
}
- buckets_to_move = h->used;
+ bch2_trans_exit(&trans);
+ bch2_moving_ctxt_exit(&ctxt);
- if (!buckets_to_move) {
- bch_err_ratelimited(c, "copygc cannot run - sectors_reserved %llu!",
- sectors_reserved);
- return 0;
- }
+ /* no entries in LRU btree found, or got to end: */
+ if (ret == -ENOENT)
+ ret = 0;
- eytzinger0_sort(h->data, h->used,
- sizeof(h->data[0]),
- bucket_offset_cmp, NULL);
-
- ret = bch2_move_data(c,
- 0, POS_MIN,
- BTREE_ID_NR, POS_MAX,
- NULL,
- writepoint_ptr(&c->copygc_write_point),
- copygc_pred, NULL,
- &move_stats);
- if (ret) {
- bch_err(c, "error %i from bch2_move_data() in copygc", ret);
- return ret;
- }
-
- ret = check_copygc_was_done(c, §ors_not_moved, &buckets_not_moved);
- if (ret) {
- bch_err(c, "error %i from check_copygc_was_done()", ret);
- return ret;
- }
+ if (ret < 0 && !bch2_err_matches(ret, EROFS))
+ bch_err(c, "error from bch2_move_data() in copygc: %s", bch2_err_str(ret));
- if (sectors_not_moved)
- bch_warn_ratelimited(c,
- "copygc finished but %llu/%llu sectors, %llu/%llu buckets not moved (move stats: moved %llu sectors, raced %llu keys, %llu sectors)",
- sectors_not_moved, sectors_to_move,
- buckets_not_moved, buckets_to_move,
- atomic64_read(&move_stats.sectors_moved),
- atomic64_read(&move_stats.keys_raced),
- atomic64_read(&move_stats.sectors_raced));
-
- trace_copygc(c,
- atomic64_read(&move_stats.sectors_moved), sectors_not_moved,
- buckets_to_move, buckets_not_moved);
- return 0;
+ trace_and_count(c, copygc, c, atomic64_read(&move_stats.sectors_moved), 0, 0, 0);
+ return ret;
}
/*
return wait;
}
+void bch2_copygc_wait_to_text(struct printbuf *out, struct bch_fs *c)
+{
+ prt_printf(out, "Currently waiting for: ");
+ prt_human_readable_u64(out, max(0LL, c->copygc_wait -
+ atomic64_read(&c->io_clock[WRITE].now)) << 9);
+ prt_newline(out);
+
+ prt_printf(out, "Currently calculated wait: ");
+ prt_human_readable_u64(out, bch2_copygc_wait_amount(c));
+ prt_newline(out);
+}
+
static int bch2_copygc_thread(void *arg)
{
struct bch_fs *c = arg;
struct io_clock *clock = &c->io_clock[WRITE];
u64 last, wait;
+ int ret = 0;
set_freezable();
- while (!kthread_should_stop()) {
+ while (!ret && !kthread_should_stop()) {
cond_resched();
if (kthread_wait_freezable(c->copy_gc_enabled))
wait = bch2_copygc_wait_amount(c);
if (wait > clock->max_slop) {
- trace_copygc_wait(c, wait, last + wait);
+ trace_and_count(c, copygc_wait, c, wait, last + wait);
c->copygc_wait = last + wait;
bch2_kthread_io_clock_wait(clock, last + wait,
MAX_SCHEDULE_TIMEOUT);
c->copygc_wait = 0;
- if (bch2_copygc(c))
- break;
+ c->copygc_running = true;
+ ret = bch2_copygc(c);
+ c->copygc_running = false;
+
+ wake_up(&c->copygc_running_wq);
}
return 0;
int bch2_copygc_start(struct bch_fs *c)
{
struct task_struct *t;
+ int ret;
if (c->copygc_thread)
return 0;
return -ENOMEM;
t = kthread_create(bch2_copygc_thread, c, "bch-copygc/%s", c->name);
- if (IS_ERR(t)) {
- bch_err(c, "error creating copygc thread: %li", PTR_ERR(t));
- return PTR_ERR(t);
+ ret = PTR_ERR_OR_ZERO(t);
+ if (ret) {
+ bch_err(c, "error creating copygc thread: %s", bch2_err_str(ret));
+ return ret;
}
get_task_struct(t);
void bch2_fs_copygc_init(struct bch_fs *c)
{
+ init_waitqueue_head(&c->copygc_running_wq);
+ c->copygc_running = false;
}
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