1 files changed, 0 insertions, 476 deletions

diff --git a/fs/bcachefs/movinggc.c b/fs/bcachefs/movinggc.c
deleted file mode 100644
index 5e6de91a8763..000000000000
--- a/fs/bcachefs/movinggc.c
+++ /dev/null
@@ -1,476 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Moving/copying garbage collector
- *
- * Copyright 2012 Google, Inc.
- */
-
-#include "bcachefs.h"
-#include "alloc_background.h"
-#include "alloc_foreground.h"
-#include "backpointers.h"
-#include "btree_iter.h"
-#include "btree_update.h"
-#include "btree_write_buffer.h"
-#include "buckets.h"
-#include "clock.h"
-#include "errcode.h"
-#include "error.h"
-#include "lru.h"
-#include "move.h"
-#include "movinggc.h"
-#include "trace.h"
-
-#include <linux/freezer.h>
-#include <linux/kthread.h>
-#include <linux/math64.h>
-#include <linux/sched/task.h>
-#include <linux/wait.h>
-
-struct buckets_in_flight {
-	struct rhashtable	*table;
-	struct move_bucket	*first;
-	struct move_bucket	*last;
-	size_t			nr;
-	size_t			sectors;
-
-	DARRAY(struct move_bucket *) to_evacuate;
-};
-
-static const struct rhashtable_params bch_move_bucket_params = {
-	.head_offset		= offsetof(struct move_bucket, hash),
-	.key_offset		= offsetof(struct move_bucket, k),
-	.key_len		= sizeof(struct move_bucket_key),
-	.automatic_shrinking	= true,
-};
-
-static void move_bucket_in_flight_add(struct buckets_in_flight *list, struct move_bucket *b)
-{
-	if (!list->first)
-		list->first = b;
-	else
-		list->last->next = b;
-
-	list->last = b;
-	list->nr++;
-	list->sectors += b->sectors;
-}
-
-static int bch2_bucket_is_movable(struct btree_trans *trans,
-				  struct move_bucket *b, u64 time)
-{
-	struct bch_fs *c = trans->c;
-
-	if (bch2_bucket_is_open(c, b->k.bucket.inode, b->k.bucket.offset))
-		return 0;
-
-	struct btree_iter iter;
-	struct bkey_s_c k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_alloc,
-				       b->k.bucket, BTREE_ITER_cached);
-	int ret = bkey_err(k);
-	if (ret)
-		return ret;
-
-	struct bch_dev *ca = bch2_dev_bucket_tryget(c, k.k->p);
-	if (!ca)
-		goto out;
-
-	if (bch2_bucket_bitmap_test(&ca->bucket_backpointer_mismatch, b->k.bucket.offset))
-		goto out;
-
-	if (ca->mi.state != BCH_MEMBER_STATE_rw ||
-	    !bch2_dev_is_online(ca))
-		goto out;
-
-	struct bch_alloc_v4 _a;
-	const struct bch_alloc_v4 *a = bch2_alloc_to_v4(k, &_a);
-	b->k.gen	= a->gen;
-	b->sectors	= bch2_bucket_sectors_dirty(*a);
-	u64 lru_idx	= alloc_lru_idx_fragmentation(*a, ca);
-
-	ret = lru_idx && lru_idx <= time;
-out:
-	bch2_dev_put(ca);
-	bch2_trans_iter_exit(trans, &iter);
-	return ret;
-}
-
-static void move_bucket_free(struct buckets_in_flight *list,
-			     struct move_bucket *b)
-{
-	int ret = rhashtable_remove_fast(list->table, &b->hash,
-					 bch_move_bucket_params);
-	BUG_ON(ret);
-	kfree(b);
-}
-
-static void move_buckets_wait(struct moving_context *ctxt,
-			      struct buckets_in_flight *list,
-			      bool flush)
-{
-	struct move_bucket *i;
-
-	while ((i = list->first)) {
-		if (flush)
-			move_ctxt_wait_event(ctxt, !atomic_read(&i->count));
-
-		if (atomic_read(&i->count))
-			break;
-
-		list->first = i->next;
-		if (!list->first)
-			list->last = NULL;
-
-		list->nr--;
-		list->sectors -= i->sectors;
-
-		move_bucket_free(list, i);
-	}
-
-	bch2_trans_unlock_long(ctxt->trans);
-}
-
-static bool bucket_in_flight(struct buckets_in_flight *list,
-			     struct move_bucket_key k)
-{
-	return rhashtable_lookup_fast(list->table, &k, bch_move_bucket_params);
-}
-
-static int bch2_copygc_get_buckets(struct moving_context *ctxt,
-			struct buckets_in_flight *buckets_in_flight)
-{
-	struct btree_trans *trans = ctxt->trans;
-	struct bch_fs *c = trans->c;
-	size_t nr_to_get = max_t(size_t, 16U, buckets_in_flight->nr / 4);
-	size_t saw = 0, in_flight = 0, not_movable = 0, sectors = 0;
-	int ret;
-
-	move_buckets_wait(ctxt, buckets_in_flight, false);
-
-	ret = bch2_btree_write_buffer_tryflush(trans);
-	if (bch2_err_matches(ret, EROFS))
-		return ret;
-
-	if (bch2_fs_fatal_err_on(ret, c, "%s: from bch2_btree_write_buffer_tryflush()", bch2_err_str(ret)))
-		return ret;
-
-	ret = for_each_btree_key_max(trans, iter, BTREE_ID_lru,
-				  lru_pos(BCH_LRU_BUCKET_FRAGMENTATION, 0, 0),
-				  lru_pos(BCH_LRU_BUCKET_FRAGMENTATION, U64_MAX, LRU_TIME_MAX),
-				  0, k, ({
-		struct move_bucket b = { .k.bucket = u64_to_bucket(k.k->p.offset) };
-		int ret2 = 0;
-
-		saw++;
-
-		ret2 = bch2_bucket_is_movable(trans, &b, lru_pos_time(k.k->p));
-		if (ret2 < 0)
-			goto err;
-
-		if (!ret2)
-			not_movable++;
-		else if (bucket_in_flight(buckets_in_flight, b.k))
-			in_flight++;
-		else {
-			struct move_bucket *b_i = kmalloc(sizeof(*b_i), GFP_KERNEL);
-			ret2 = b_i ? 0 : -ENOMEM;
-			if (ret2)
-				goto err;
-
-			*b_i = b;
-
-			ret2 = darray_push(&buckets_in_flight->to_evacuate, b_i);
-			if (ret2) {
-				kfree(b_i);
-				goto err;
-			}
-
-			ret2 = rhashtable_lookup_insert_fast(buckets_in_flight->table, &b_i->hash,
-							     bch_move_bucket_params);
-			BUG_ON(ret2);
-
-			sectors += b.sectors;
-		}
-
-		ret2 = buckets_in_flight->to_evacuate.nr >= nr_to_get;
-err:
-		ret2;
-	}));
-
-	pr_debug("have: %zu (%zu) saw %zu in flight %zu not movable %zu got %zu (%zu)/%zu buckets ret %i",
-		 buckets_in_flight->nr, buckets_in_flight->sectors,
-		 saw, in_flight, not_movable, buckets_in_flight->to_evacuate.nr, sectors, nr_to_get, ret);
-
-	return ret < 0 ? ret : 0;
-}
-
-noinline
-static int bch2_copygc(struct moving_context *ctxt,
-		       struct buckets_in_flight *buckets_in_flight,
-		       bool *did_work)
-{
-	struct btree_trans *trans = ctxt->trans;
-	struct bch_fs *c = trans->c;
-	struct data_update_opts data_opts = {
-		.btree_insert_flags = BCH_WATERMARK_copygc,
-	};
-	u64 sectors_seen	= atomic64_read(&ctxt->stats->sectors_seen);
-	u64 sectors_moved	= atomic64_read(&ctxt->stats->sectors_moved);
-	int ret = 0;
-
-	ret = bch2_copygc_get_buckets(ctxt, buckets_in_flight);
-	if (ret)
-		goto err;
-
-	darray_for_each(buckets_in_flight->to_evacuate, i) {
-		if (kthread_should_stop() || freezing(current))
-			break;
-
-		struct move_bucket *b = *i;
-		*i = NULL;
-
-		move_bucket_in_flight_add(buckets_in_flight, b);
-
-		ret = bch2_evacuate_bucket(ctxt, b, b->k.bucket, b->k.gen, data_opts);
-		if (ret)
-			goto err;
-
-		*did_work = true;
-	}
-err:
-	/* no entries in LRU btree found, or got to end: */
-	if (bch2_err_matches(ret, ENOENT))
-		ret = 0;
-
-	if (ret < 0 && !bch2_err_matches(ret, EROFS))
-		bch_err_msg(c, ret, "from bch2_move_data()");
-
-	sectors_seen	= atomic64_read(&ctxt->stats->sectors_seen) - sectors_seen;
-	sectors_moved	= atomic64_read(&ctxt->stats->sectors_moved) - sectors_moved;
-	trace_and_count(c, copygc, c, buckets_in_flight->to_evacuate.nr, sectors_seen, sectors_moved);
-
-	darray_for_each(buckets_in_flight->to_evacuate, i)
-		if (*i)
-			move_bucket_free(buckets_in_flight, *i);
-	darray_exit(&buckets_in_flight->to_evacuate);
-	return ret;
-}
-
-static u64 bch2_copygc_dev_wait_amount(struct bch_dev *ca)
-{
-	struct bch_dev_usage_full usage_full = bch2_dev_usage_full_read(ca);
-	struct bch_dev_usage usage;
-
-	for (unsigned i = 0; i < BCH_DATA_NR; i++)
-		usage.buckets[i] = usage_full.d[i].buckets;
-
-	s64 fragmented_allowed = ((__dev_buckets_available(ca, usage, BCH_WATERMARK_stripe) *
-				   ca->mi.bucket_size) >> 1);
-	s64 fragmented = 0;
-
-	for (unsigned i = 0; i < BCH_DATA_NR; i++)
-		if (data_type_movable(i))
-			fragmented += usage_full.d[i].fragmented;
-
-	return max(0LL, fragmented_allowed - fragmented);
-}
-
-/*
- * Copygc runs when the amount of fragmented data is above some arbitrary
- * threshold:
- *
- * The threshold at the limit - when the device is full - is the amount of space
- * we reserved in bch2_recalc_capacity; we can't have more than that amount of
- * disk space stranded due to fragmentation and store everything we have
- * promised to store.
- *
- * But we don't want to be running copygc unnecessarily when the device still
- * has plenty of free space - rather, we want copygc to smoothly run every so
- * often and continually reduce the amount of fragmented space as the device
- * fills up. So, we increase the threshold by half the current free space.
- */
-u64 bch2_copygc_wait_amount(struct bch_fs *c)
-{
-	u64 wait = U64_MAX;
-
-	guard(rcu)();
-	for_each_rw_member_rcu(c, ca)
-		wait = min(wait, bch2_copygc_dev_wait_amount(ca));
-	return wait;
-}
-
-void bch2_copygc_wait_to_text(struct printbuf *out, struct bch_fs *c)
-{
-	printbuf_tabstop_push(out, 32);
-	prt_printf(out, "running:\t%u\n",		c->copygc_running);
-	prt_printf(out, "copygc_wait:\t%llu\n",		c->copygc_wait);
-	prt_printf(out, "copygc_wait_at:\t%llu\n",	c->copygc_wait_at);
-
-	prt_printf(out, "Currently waiting for:\t");
-	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 waiting since:\t");
-	prt_human_readable_u64(out, max(0LL,
-					atomic64_read(&c->io_clock[WRITE].now) -
-					c->copygc_wait_at) << 9);
-	prt_newline(out);
-
-	bch2_printbuf_make_room(out, 4096);
-
-	struct task_struct *t;
-	out->atomic++;
-	scoped_guard(rcu) {
-		prt_printf(out, "Currently calculated wait:\n");
-		for_each_rw_member_rcu(c, ca) {
-			prt_printf(out, "  %s:\t", ca->name);
-			prt_human_readable_u64(out, bch2_copygc_dev_wait_amount(ca));
-			prt_newline(out);
-		}
-
-		t = rcu_dereference(c->copygc_thread);
-		if (t)
-			get_task_struct(t);
-	}
-	--out->atomic;
-
-	if (t) {
-		bch2_prt_task_backtrace(out, t, 0, GFP_KERNEL);
-		put_task_struct(t);
-	}
-}
-
-static int bch2_copygc_thread(void *arg)
-{
-	struct bch_fs *c = arg;
-	struct moving_context ctxt;
-	struct bch_move_stats move_stats;
-	struct io_clock *clock = &c->io_clock[WRITE];
-	struct buckets_in_flight buckets = {};
-	u64 last, wait;
-
-	buckets.table = kzalloc(sizeof(*buckets.table), GFP_KERNEL);
-	int ret = !buckets.table
-		? -ENOMEM
-		: rhashtable_init(buckets.table, &bch_move_bucket_params);
-	bch_err_msg(c, ret, "allocating copygc buckets in flight");
-	if (ret)
-		goto err;
-
-	set_freezable();
-
-	/*
-	 * Data move operations can't run until after check_snapshots has
-	 * completed, and bch2_snapshot_is_ancestor() is available.
-	 */
-	kthread_wait_freezable(c->recovery.pass_done > BCH_RECOVERY_PASS_check_snapshots ||
-			       kthread_should_stop());
-
-	bch2_move_stats_init(&move_stats, "copygc");
-	bch2_moving_ctxt_init(&ctxt, c, NULL, &move_stats,
-			      writepoint_ptr(&c->copygc_write_point),
-			      false);
-
-	while (!ret && !kthread_should_stop()) {
-		bool did_work = false;
-
-		bch2_trans_unlock_long(ctxt.trans);
-		cond_resched();
-
-		if (!c->opts.copygc_enabled) {
-			move_buckets_wait(&ctxt, &buckets, true);
-			kthread_wait_freezable(c->opts.copygc_enabled ||
-					       kthread_should_stop());
-		}
-
-		if (unlikely(freezing(current))) {
-			move_buckets_wait(&ctxt, &buckets, true);
-			__refrigerator(false);
-			continue;
-		}
-
-		last = atomic64_read(&clock->now);
-		wait = bch2_copygc_wait_amount(c);
-
-		if (wait > clock->max_slop) {
-			c->copygc_wait_at = last;
-			c->copygc_wait = last + wait;
-			move_buckets_wait(&ctxt, &buckets, true);
-			trace_and_count(c, copygc_wait, c, wait, last + wait);
-			bch2_kthread_io_clock_wait(clock, last + wait,
-					MAX_SCHEDULE_TIMEOUT);
-			continue;
-		}
-
-		c->copygc_wait = 0;
-
-		c->copygc_running = true;
-		ret = bch2_copygc(&ctxt, &buckets, &did_work);
-		c->copygc_running = false;
-
-		wake_up(&c->copygc_running_wq);
-
-		if (!wait && !did_work) {
-			u64 min_member_capacity = bch2_min_rw_member_capacity(c);
-
-			if (min_member_capacity == U64_MAX)
-				min_member_capacity = 128 * 2048;
-
-			move_buckets_wait(&ctxt, &buckets, true);
-			bch2_kthread_io_clock_wait(clock, last + (min_member_capacity >> 6),
-					MAX_SCHEDULE_TIMEOUT);
-		}
-	}
-
-	move_buckets_wait(&ctxt, &buckets, true);
-	rhashtable_destroy(buckets.table);
-	bch2_moving_ctxt_exit(&ctxt);
-	bch2_move_stats_exit(&move_stats, c);
-err:
-	kfree(buckets.table);
-	return ret;
-}
-
-void bch2_copygc_stop(struct bch_fs *c)
-{
-	if (c->copygc_thread) {
-		kthread_stop(c->copygc_thread);
-		put_task_struct(c->copygc_thread);
-	}
-	c->copygc_thread = NULL;
-}
-
-int bch2_copygc_start(struct bch_fs *c)
-{
-	struct task_struct *t;
-	int ret;
-
-	if (c->copygc_thread)
-		return 0;
-
-	if (c->opts.nochanges)
-		return 0;
-
-	if (bch2_fs_init_fault("copygc_start"))
-		return -ENOMEM;
-
-	t = kthread_create(bch2_copygc_thread, c, "bch-copygc/%s", c->name);
-	ret = PTR_ERR_OR_ZERO(t);
-	bch_err_msg(c, ret, "creating copygc thread");
-	if (ret)
-		return ret;
-
-	get_task_struct(t);
-
-	c->copygc_thread = t;
-	wake_up_process(c->copygc_thread);
-
-	return 0;
-}
-
-void bch2_fs_copygc_init(struct bch_fs *c)
-{
-	init_waitqueue_head(&c->copygc_running_wq);
-	c->copygc_running = false;
-}