move Rust sources to top level, C sources into c_src

This moves the Rust sources out of rust_src/ and into the top level.
Running the bcachefs executable out of the development tree is now:

$ ./target/release/bcachefs command
or
$ cargo run --profile release -- command

instead of "./bcachefs command".

Building and installing is still:

$ make && make install

Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 0 insertions, 1161 deletions

diff --git a/libbcachefs/move.c b/libbcachefs/move.c
deleted file mode 100644
index 7a33319d..00000000
--- a/libbcachefs/move.c
+++ /dev/null
@@ -1,1161 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include "bcachefs.h"
-#include "alloc_background.h"
-#include "alloc_foreground.h"
-#include "backpointers.h"
-#include "bkey_buf.h"
-#include "btree_gc.h"
-#include "btree_update.h"
-#include "btree_update_interior.h"
-#include "btree_write_buffer.h"
-#include "disk_groups.h"
-#include "ec.h"
-#include "errcode.h"
-#include "error.h"
-#include "inode.h"
-#include "io_read.h"
-#include "io_write.h"
-#include "journal_reclaim.h"
-#include "keylist.h"
-#include "move.h"
-#include "replicas.h"
-#include "snapshot.h"
-#include "super-io.h"
-#include "trace.h"
-
-#include <linux/ioprio.h>
-#include <linux/kthread.h>
-
-const char * const bch2_data_ops_strs[] = {
-#define x(t, n, ...) [n] = #t,
-	BCH_DATA_OPS()
-#undef x
-	NULL
-};
-
-static void trace_move_extent2(struct bch_fs *c, struct bkey_s_c k)
-{
-	if (trace_move_extent_enabled()) {
-		struct printbuf buf = PRINTBUF;
-
-		bch2_bkey_val_to_text(&buf, c, k);
-		trace_move_extent(c, buf.buf);
-		printbuf_exit(&buf);
-	}
-}
-
-static void trace_move_extent_read2(struct bch_fs *c, struct bkey_s_c k)
-{
-	if (trace_move_extent_read_enabled()) {
-		struct printbuf buf = PRINTBUF;
-
-		bch2_bkey_val_to_text(&buf, c, k);
-		trace_move_extent_read(c, buf.buf);
-		printbuf_exit(&buf);
-	}
-}
-
-struct moving_io {
-	struct list_head		read_list;
-	struct list_head		io_list;
-	struct move_bucket_in_flight	*b;
-	struct closure			cl;
-	bool				read_completed;
-
-	unsigned			read_sectors;
-	unsigned			write_sectors;
-
-	struct bch_read_bio		rbio;
-
-	struct data_update		write;
-	/* Must be last since it is variable size */
-	struct bio_vec			bi_inline_vecs[];
-};
-
-static void move_free(struct moving_io *io)
-{
-	struct moving_context *ctxt = io->write.ctxt;
-
-	if (io->b)
-		atomic_dec(&io->b->count);
-
-	bch2_data_update_exit(&io->write);
-
-	mutex_lock(&ctxt->lock);
-	list_del(&io->io_list);
-	wake_up(&ctxt->wait);
-	mutex_unlock(&ctxt->lock);
-
-	kfree(io);
-}
-
-static void move_write_done(struct bch_write_op *op)
-{
-	struct moving_io *io = container_of(op, struct moving_io, write.op);
-	struct moving_context *ctxt = io->write.ctxt;
-
-	if (io->write.op.error)
-		ctxt->write_error = true;
-
-	atomic_sub(io->write_sectors, &io->write.ctxt->write_sectors);
-	atomic_dec(&io->write.ctxt->write_ios);
-	move_free(io);
-	closure_put(&ctxt->cl);
-}
-
-static void move_write(struct moving_io *io)
-{
-	if (unlikely(io->rbio.bio.bi_status || io->rbio.hole)) {
-		move_free(io);
-		return;
-	}
-
-	closure_get(&io->write.ctxt->cl);
-	atomic_add(io->write_sectors, &io->write.ctxt->write_sectors);
-	atomic_inc(&io->write.ctxt->write_ios);
-
-	bch2_data_update_read_done(&io->write, io->rbio.pick.crc);
-}
-
-struct moving_io *bch2_moving_ctxt_next_pending_write(struct moving_context *ctxt)
-{
-	struct moving_io *io =
-		list_first_entry_or_null(&ctxt->reads, struct moving_io, read_list);
-
-	return io && io->read_completed ? io : NULL;
-}
-
-static void move_read_endio(struct bio *bio)
-{
-	struct moving_io *io = container_of(bio, struct moving_io, rbio.bio);
-	struct moving_context *ctxt = io->write.ctxt;
-
-	atomic_sub(io->read_sectors, &ctxt->read_sectors);
-	atomic_dec(&ctxt->read_ios);
-	io->read_completed = true;
-
-	wake_up(&ctxt->wait);
-	closure_put(&ctxt->cl);
-}
-
-void bch2_moving_ctxt_do_pending_writes(struct moving_context *ctxt)
-{
-	struct moving_io *io;
-
-	while ((io = bch2_moving_ctxt_next_pending_write(ctxt))) {
-		bch2_trans_unlock_long(ctxt->trans);
-		list_del(&io->read_list);
-		move_write(io);
-	}
-}
-
-void bch2_move_ctxt_wait_for_io(struct moving_context *ctxt)
-{
-	unsigned sectors_pending = atomic_read(&ctxt->write_sectors);
-
-	move_ctxt_wait_event(ctxt,
-		!atomic_read(&ctxt->write_sectors) ||
-		atomic_read(&ctxt->write_sectors) != sectors_pending);
-}
-
-void bch2_moving_ctxt_flush_all(struct moving_context *ctxt)
-{
-	move_ctxt_wait_event(ctxt, list_empty(&ctxt->reads));
-	bch2_trans_unlock_long(ctxt->trans);
-	closure_sync(&ctxt->cl);
-}
-
-void bch2_moving_ctxt_exit(struct moving_context *ctxt)
-{
-	struct bch_fs *c = ctxt->trans->c;
-
-	bch2_moving_ctxt_flush_all(ctxt);
-
-	EBUG_ON(atomic_read(&ctxt->write_sectors));
-	EBUG_ON(atomic_read(&ctxt->write_ios));
-	EBUG_ON(atomic_read(&ctxt->read_sectors));
-	EBUG_ON(atomic_read(&ctxt->read_ios));
-
-	mutex_lock(&c->moving_context_lock);
-	list_del(&ctxt->list);
-	mutex_unlock(&c->moving_context_lock);
-
-	bch2_trans_put(ctxt->trans);
-	memset(ctxt, 0, sizeof(*ctxt));
-}
-
-void bch2_moving_ctxt_init(struct moving_context *ctxt,
-			   struct bch_fs *c,
-			   struct bch_ratelimit *rate,
-			   struct bch_move_stats *stats,
-			   struct write_point_specifier wp,
-			   bool wait_on_copygc)
-{
-	memset(ctxt, 0, sizeof(*ctxt));
-
-	ctxt->trans	= bch2_trans_get(c);
-	ctxt->fn	= (void *) _RET_IP_;
-	ctxt->rate	= rate;
-	ctxt->stats	= stats;
-	ctxt->wp	= wp;
-	ctxt->wait_on_copygc = wait_on_copygc;
-
-	closure_init_stack(&ctxt->cl);
-
-	mutex_init(&ctxt->lock);
-	INIT_LIST_HEAD(&ctxt->reads);
-	INIT_LIST_HEAD(&ctxt->ios);
-	init_waitqueue_head(&ctxt->wait);
-
-	mutex_lock(&c->moving_context_lock);
-	list_add(&ctxt->list, &c->moving_context_list);
-	mutex_unlock(&c->moving_context_lock);
-}
-
-void bch2_move_stats_exit(struct bch_move_stats *stats, struct bch_fs *c)
-{
-	trace_move_data(c, stats);
-}
-
-void bch2_move_stats_init(struct bch_move_stats *stats, const char *name)
-{
-	memset(stats, 0, sizeof(*stats));
-	stats->data_type = BCH_DATA_user;
-	scnprintf(stats->name, sizeof(stats->name), "%s", name);
-}
-
-int bch2_move_extent(struct moving_context *ctxt,
-		     struct move_bucket_in_flight *bucket_in_flight,
-		     struct btree_iter *iter,
-		     struct bkey_s_c k,
-		     struct bch_io_opts io_opts,
-		     struct data_update_opts data_opts)
-{
-	struct btree_trans *trans = ctxt->trans;
-	struct bch_fs *c = trans->c;
-	struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
-	struct moving_io *io;
-	const union bch_extent_entry *entry;
-	struct extent_ptr_decoded p;
-	unsigned sectors = k.k->size, pages;
-	int ret = -ENOMEM;
-
-	if (ctxt->stats)
-		ctxt->stats->pos = BBPOS(iter->btree_id, iter->pos);
-	trace_move_extent2(c, k);
-
-	bch2_data_update_opts_normalize(k, &data_opts);
-
-	if (!data_opts.rewrite_ptrs &&
-	    !data_opts.extra_replicas) {
-		if (data_opts.kill_ptrs)
-			return bch2_extent_drop_ptrs(trans, iter, k, data_opts);
-		return 0;
-	}
-
-	/*
-	 * Before memory allocations & taking nocow locks in
-	 * bch2_data_update_init():
-	 */
-	bch2_trans_unlock(trans);
-
-	/* write path might have to decompress data: */
-	bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
-		sectors = max_t(unsigned, sectors, p.crc.uncompressed_size);
-
-	pages = DIV_ROUND_UP(sectors, PAGE_SECTORS);
-	io = kzalloc(sizeof(struct moving_io) +
-		     sizeof(struct bio_vec) * pages, GFP_KERNEL);
-	if (!io)
-		goto err;
-
-	INIT_LIST_HEAD(&io->io_list);
-	io->write.ctxt		= ctxt;
-	io->read_sectors	= k.k->size;
-	io->write_sectors	= k.k->size;
-
-	bio_init(&io->write.op.wbio.bio, NULL, io->bi_inline_vecs, pages, 0);
-	bio_set_prio(&io->write.op.wbio.bio,
-		     IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
-
-	if (bch2_bio_alloc_pages(&io->write.op.wbio.bio, sectors << 9,
-				 GFP_KERNEL))
-		goto err_free;
-
-	io->rbio.c		= c;
-	io->rbio.opts		= io_opts;
-	bio_init(&io->rbio.bio, NULL, io->bi_inline_vecs, pages, 0);
-	io->rbio.bio.bi_vcnt = pages;
-	bio_set_prio(&io->rbio.bio, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
-	io->rbio.bio.bi_iter.bi_size = sectors << 9;
-
-	io->rbio.bio.bi_opf		= REQ_OP_READ;
-	io->rbio.bio.bi_iter.bi_sector	= bkey_start_offset(k.k);
-	io->rbio.bio.bi_end_io		= move_read_endio;
-
-	ret = bch2_data_update_init(trans, iter, ctxt, &io->write, ctxt->wp,
-				    io_opts, data_opts, iter->btree_id, k);
-	if (ret)
-		goto err_free_pages;
-
-	io->write.op.end_io = move_write_done;
-
-	if (ctxt->rate)
-		bch2_ratelimit_increment(ctxt->rate, k.k->size);
-
-	if (ctxt->stats) {
-		atomic64_inc(&ctxt->stats->keys_moved);
-		atomic64_add(k.k->size, &ctxt->stats->sectors_moved);
-	}
-
-	if (bucket_in_flight) {
-		io->b = bucket_in_flight;
-		atomic_inc(&io->b->count);
-	}
-
-	this_cpu_add(c->counters[BCH_COUNTER_io_move], k.k->size);
-	this_cpu_add(c->counters[BCH_COUNTER_move_extent_read], k.k->size);
-	trace_move_extent_read2(c, k);
-
-	mutex_lock(&ctxt->lock);
-	atomic_add(io->read_sectors, &ctxt->read_sectors);
-	atomic_inc(&ctxt->read_ios);
-
-	list_add_tail(&io->read_list, &ctxt->reads);
-	list_add_tail(&io->io_list, &ctxt->ios);
-	mutex_unlock(&ctxt->lock);
-
-	/*
-	 * dropped by move_read_endio() - guards against use after free of
-	 * ctxt when doing wakeup
-	 */
-	closure_get(&ctxt->cl);
-	bch2_read_extent(trans, &io->rbio,
-			 bkey_start_pos(k.k),
-			 iter->btree_id, k, 0,
-			 BCH_READ_NODECODE|
-			 BCH_READ_LAST_FRAGMENT);
-	return 0;
-err_free_pages:
-	bio_free_pages(&io->write.op.wbio.bio);
-err_free:
-	kfree(io);
-err:
-	if (ret == -BCH_ERR_data_update_done)
-		return 0;
-
-	if (bch2_err_matches(ret, EROFS) ||
-	    bch2_err_matches(ret, BCH_ERR_transaction_restart))
-		return ret;
-
-	count_event(c, move_extent_start_fail);
-
-	if (trace_move_extent_start_fail_enabled()) {
-		struct printbuf buf = PRINTBUF;
-
-		bch2_bkey_val_to_text(&buf, c, k);
-		prt_str(&buf, ": ");
-		prt_str(&buf, bch2_err_str(ret));
-		trace_move_extent_start_fail(c, buf.buf);
-		printbuf_exit(&buf);
-	}
-	return ret;
-}
-
-struct bch_io_opts *bch2_move_get_io_opts(struct btree_trans *trans,
-			  struct per_snapshot_io_opts *io_opts,
-			  struct bkey_s_c extent_k)
-{
-	struct bch_fs *c = trans->c;
-	u32 restart_count = trans->restart_count;
-	int ret = 0;
-
-	if (io_opts->cur_inum != extent_k.k->p.inode) {
-		io_opts->d.nr = 0;
-
-		ret = for_each_btree_key(trans, iter, BTREE_ID_inodes, POS(0, extent_k.k->p.inode),
-					 BTREE_ITER_ALL_SNAPSHOTS, k, ({
-			if (k.k->p.offset != extent_k.k->p.inode)
-				break;
-
-			if (!bkey_is_inode(k.k))
-				continue;
-
-			struct bch_inode_unpacked inode;
-			BUG_ON(bch2_inode_unpack(k, &inode));
-
-			struct snapshot_io_opts_entry e = { .snapshot = k.k->p.snapshot };
-			bch2_inode_opts_get(&e.io_opts, trans->c, &inode);
-
-			darray_push(&io_opts->d, e);
-		}));
-		io_opts->cur_inum = extent_k.k->p.inode;
-	}
-
-	ret = ret ?: trans_was_restarted(trans, restart_count);
-	if (ret)
-		return ERR_PTR(ret);
-
-	if (extent_k.k->p.snapshot)
-		darray_for_each(io_opts->d, i)
-			if (bch2_snapshot_is_ancestor(c, extent_k.k->p.snapshot, i->snapshot))
-				return &i->io_opts;
-
-	return &io_opts->fs_io_opts;
-}
-
-int bch2_move_get_io_opts_one(struct btree_trans *trans,
-			      struct bch_io_opts *io_opts,
-			      struct bkey_s_c extent_k)
-{
-	struct btree_iter iter;
-	struct bkey_s_c k;
-	int ret;
-
-	/* reflink btree? */
-	if (!extent_k.k->p.inode) {
-		*io_opts = bch2_opts_to_inode_opts(trans->c->opts);
-		return 0;
-	}
-
-	k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_inodes,
-			       SPOS(0, extent_k.k->p.inode, extent_k.k->p.snapshot),
-			       BTREE_ITER_CACHED);
-	ret = bkey_err(k);
-	if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-		return ret;
-
-	if (!ret && bkey_is_inode(k.k)) {
-		struct bch_inode_unpacked inode;
-		bch2_inode_unpack(k, &inode);
-		bch2_inode_opts_get(io_opts, trans->c, &inode);
-	} else {
-		*io_opts = bch2_opts_to_inode_opts(trans->c->opts);
-	}
-
-	bch2_trans_iter_exit(trans, &iter);
-	return 0;
-}
-
-int bch2_move_ratelimit(struct moving_context *ctxt)
-{
-	struct bch_fs *c = ctxt->trans->c;
-	bool is_kthread = current->flags & PF_KTHREAD;
-	u64 delay;
-
-	if (ctxt->wait_on_copygc && c->copygc_running) {
-		bch2_moving_ctxt_flush_all(ctxt);
-		wait_event_killable(c->copygc_running_wq,
-				    !c->copygc_running ||
-				    (is_kthread && kthread_should_stop()));
-	}
-
-	do {
-		delay = ctxt->rate ? bch2_ratelimit_delay(ctxt->rate) : 0;
-
-		if (is_kthread && kthread_should_stop())
-			return 1;
-
-		if (delay)
-			move_ctxt_wait_event_timeout(ctxt,
-					freezing(current) ||
-					(is_kthread && kthread_should_stop()),
-					delay);
-
-		if (unlikely(freezing(current))) {
-			bch2_moving_ctxt_flush_all(ctxt);
-			try_to_freeze();
-		}
-	} while (delay);
-
-	/*
-	 * XXX: these limits really ought to be per device, SSDs and hard drives
-	 * will want different limits
-	 */
-	move_ctxt_wait_event(ctxt,
-		atomic_read(&ctxt->write_sectors) < c->opts.move_bytes_in_flight >> 9 &&
-		atomic_read(&ctxt->read_sectors) < c->opts.move_bytes_in_flight >> 9 &&
-		atomic_read(&ctxt->write_ios) < c->opts.move_ios_in_flight &&
-		atomic_read(&ctxt->read_ios) < c->opts.move_ios_in_flight);
-
-	return 0;
-}
-
-static int bch2_move_data_btree(struct moving_context *ctxt,
-				struct bpos start,
-				struct bpos end,
-				move_pred_fn pred, void *arg,
-				enum btree_id btree_id)
-{
-	struct btree_trans *trans = ctxt->trans;
-	struct bch_fs *c = trans->c;
-	struct per_snapshot_io_opts snapshot_io_opts;
-	struct bch_io_opts *io_opts;
-	struct bkey_buf sk;
-	struct btree_iter iter;
-	struct bkey_s_c k;
-	struct data_update_opts data_opts;
-	int ret = 0, ret2;
-
-	per_snapshot_io_opts_init(&snapshot_io_opts, c);
-	bch2_bkey_buf_init(&sk);
-
-	if (ctxt->stats) {
-		ctxt->stats->data_type	= BCH_DATA_user;
-		ctxt->stats->pos	= BBPOS(btree_id, start);
-	}
-
-	bch2_trans_iter_init(trans, &iter, btree_id, start,
-			     BTREE_ITER_PREFETCH|
-			     BTREE_ITER_ALL_SNAPSHOTS);
-
-	if (ctxt->rate)
-		bch2_ratelimit_reset(ctxt->rate);
-
-	while (!bch2_move_ratelimit(ctxt)) {
-		bch2_trans_begin(trans);
-
-		k = bch2_btree_iter_peek(&iter);
-		if (!k.k)
-			break;
-
-		ret = bkey_err(k);
-		if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-			continue;
-		if (ret)
-			break;
-
-		if (bkey_ge(bkey_start_pos(k.k), end))
-			break;
-
-		if (ctxt->stats)
-			ctxt->stats->pos = BBPOS(iter.btree_id, iter.pos);
-
-		if (!bkey_extent_is_direct_data(k.k))
-			goto next_nondata;
-
-		io_opts = bch2_move_get_io_opts(trans, &snapshot_io_opts, k);
-		ret = PTR_ERR_OR_ZERO(io_opts);
-		if (ret)
-			continue;
-
-		memset(&data_opts, 0, sizeof(data_opts));
-		if (!pred(c, arg, k, io_opts, &data_opts))
-			goto next;
-
-		/*
-		 * The iterator gets unlocked by __bch2_read_extent - need to
-		 * save a copy of @k elsewhere:
-		 */
-		bch2_bkey_buf_reassemble(&sk, c, k);
-		k = bkey_i_to_s_c(sk.k);
-
-		ret2 = bch2_move_extent(ctxt, NULL, &iter, k, *io_opts, data_opts);
-		if (ret2) {
-			if (bch2_err_matches(ret2, BCH_ERR_transaction_restart))
-				continue;
-
-			if (ret2 == -ENOMEM) {
-				/* memory allocation failure, wait for some IO to finish */
-				bch2_move_ctxt_wait_for_io(ctxt);
-				continue;
-			}
-
-			/* XXX signal failure */
-			goto next;
-		}
-next:
-		if (ctxt->stats)
-			atomic64_add(k.k->size, &ctxt->stats->sectors_seen);
-next_nondata:
-		bch2_btree_iter_advance(&iter);
-	}
-
-	bch2_trans_iter_exit(trans, &iter);
-	bch2_bkey_buf_exit(&sk, c);
-	per_snapshot_io_opts_exit(&snapshot_io_opts);
-
-	return ret;
-}
-
-int __bch2_move_data(struct moving_context *ctxt,
-		     struct bbpos start,
-		     struct bbpos end,
-		     move_pred_fn pred, void *arg)
-{
-	struct bch_fs *c = ctxt->trans->c;
-	enum btree_id id;
-	int ret = 0;
-
-	for (id = start.btree;
-	     id <= min_t(unsigned, end.btree, btree_id_nr_alive(c) - 1);
-	     id++) {
-		ctxt->stats->pos = BBPOS(id, POS_MIN);
-
-		if (!btree_type_has_ptrs(id) ||
-		    !bch2_btree_id_root(c, id)->b)
-			continue;
-
-		ret = bch2_move_data_btree(ctxt,
-				       id == start.btree ? start.pos : POS_MIN,
-				       id == end.btree   ? end.pos   : POS_MAX,
-				       pred, arg, id);
-		if (ret)
-			break;
-	}
-
-	return ret;
-}
-
-int bch2_move_data(struct bch_fs *c,
-		   struct bbpos start,
-		   struct bbpos end,
-		   struct bch_ratelimit *rate,
-		   struct bch_move_stats *stats,
-		   struct write_point_specifier wp,
-		   bool wait_on_copygc,
-		   move_pred_fn pred, void *arg)
-{
-
-	struct moving_context ctxt;
-	int ret;
-
-	bch2_moving_ctxt_init(&ctxt, c, rate, stats, wp, wait_on_copygc);
-	ret = __bch2_move_data(&ctxt, start, end, pred, arg);
-	bch2_moving_ctxt_exit(&ctxt);
-
-	return ret;
-}
-
-int bch2_evacuate_bucket(struct moving_context *ctxt,
-			   struct move_bucket_in_flight *bucket_in_flight,
-			   struct bpos bucket, int gen,
-			   struct data_update_opts _data_opts)
-{
-	struct btree_trans *trans = ctxt->trans;
-	struct bch_fs *c = trans->c;
-	bool is_kthread = current->flags & PF_KTHREAD;
-	struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
-	struct btree_iter iter;
-	struct bkey_buf sk;
-	struct bch_backpointer bp;
-	struct bch_alloc_v4 a_convert;
-	const struct bch_alloc_v4 *a;
-	struct bkey_s_c k;
-	struct data_update_opts data_opts;
-	unsigned dirty_sectors, bucket_size;
-	u64 fragmentation;
-	struct bpos bp_pos = POS_MIN;
-	int ret = 0;
-
-	trace_bucket_evacuate(c, &bucket);
-
-	bch2_bkey_buf_init(&sk);
-
-	/*
-	 * We're not run in a context that handles transaction restarts:
-	 */
-	bch2_trans_begin(trans);
-
-	bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
-			     bucket, BTREE_ITER_CACHED);
-	ret = lockrestart_do(trans,
-			bkey_err(k = bch2_btree_iter_peek_slot(&iter)));
-	bch2_trans_iter_exit(trans, &iter);
-
-	bch_err_msg(c, ret, "looking up alloc key");
-	if (ret)
-		goto err;
-
-	a = bch2_alloc_to_v4(k, &a_convert);
-	dirty_sectors = bch2_bucket_sectors_dirty(*a);
-	bucket_size = bch_dev_bkey_exists(c, bucket.inode)->mi.bucket_size;
-	fragmentation = a->fragmentation_lru;
-
-	ret = bch2_btree_write_buffer_tryflush(trans);
-	bch_err_msg(c, ret, "flushing btree write buffer");
-	if (ret)
-		goto err;
-
-	while (!(ret = bch2_move_ratelimit(ctxt))) {
-		if (is_kthread && kthread_should_stop())
-			break;
-
-		bch2_trans_begin(trans);
-
-		ret = bch2_get_next_backpointer(trans, bucket, gen,
-						&bp_pos, &bp,
-						BTREE_ITER_CACHED);
-		if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-			continue;
-		if (ret)
-			goto err;
-		if (bkey_eq(bp_pos, POS_MAX))
-			break;
-
-		if (!bp.level) {
-			k = bch2_backpointer_get_key(trans, &iter, bp_pos, bp, 0);
-			ret = bkey_err(k);
-			if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-				continue;
-			if (ret)
-				goto err;
-			if (!k.k)
-				goto next;
-
-			bch2_bkey_buf_reassemble(&sk, c, k);
-			k = bkey_i_to_s_c(sk.k);
-
-			ret = bch2_move_get_io_opts_one(trans, &io_opts, k);
-			if (ret) {
-				bch2_trans_iter_exit(trans, &iter);
-				continue;
-			}
-
-			data_opts = _data_opts;
-			data_opts.target	= io_opts.background_target;
-			data_opts.rewrite_ptrs = 0;
-
-			unsigned i = 0;
-			bkey_for_each_ptr(bch2_bkey_ptrs_c(k), ptr) {
-				if (ptr->dev == bucket.inode) {
-					data_opts.rewrite_ptrs |= 1U << i;
-					if (ptr->cached) {
-						bch2_trans_iter_exit(trans, &iter);
-						goto next;
-					}
-				}
-				i++;
-			}
-
-			ret = bch2_move_extent(ctxt, bucket_in_flight,
-					       &iter, k, io_opts, data_opts);
-			bch2_trans_iter_exit(trans, &iter);
-
-			if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-				continue;
-			if (ret == -ENOMEM) {
-				/* memory allocation failure, wait for some IO to finish */
-				bch2_move_ctxt_wait_for_io(ctxt);
-				continue;
-			}
-			if (ret)
-				goto err;
-
-			if (ctxt->stats)
-				atomic64_add(k.k->size, &ctxt->stats->sectors_seen);
-		} else {
-			struct btree *b;
-
-			b = bch2_backpointer_get_node(trans, &iter, bp_pos, bp);
-			ret = PTR_ERR_OR_ZERO(b);
-			if (ret == -BCH_ERR_backpointer_to_overwritten_btree_node)
-				continue;
-			if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-				continue;
-			if (ret)
-				goto err;
-			if (!b)
-				goto next;
-
-			ret = bch2_btree_node_rewrite(trans, &iter, b, 0);
-			bch2_trans_iter_exit(trans, &iter);
-
-			if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-				continue;
-			if (ret)
-				goto err;
-
-			if (ctxt->rate)
-				bch2_ratelimit_increment(ctxt->rate,
-							 c->opts.btree_node_size >> 9);
-			if (ctxt->stats) {
-				atomic64_add(c->opts.btree_node_size >> 9, &ctxt->stats->sectors_seen);
-				atomic64_add(c->opts.btree_node_size >> 9, &ctxt->stats->sectors_moved);
-			}
-		}
-next:
-		bp_pos = bpos_nosnap_successor(bp_pos);
-	}
-
-	trace_evacuate_bucket(c, &bucket, dirty_sectors, bucket_size, fragmentation, ret);
-err:
-	bch2_bkey_buf_exit(&sk, c);
-	return ret;
-}
-
-typedef bool (*move_btree_pred)(struct bch_fs *, void *,
-				struct btree *, struct bch_io_opts *,
-				struct data_update_opts *);
-
-static int bch2_move_btree(struct bch_fs *c,
-			   struct bbpos start,
-			   struct bbpos end,
-			   move_btree_pred pred, void *arg,
-			   struct bch_move_stats *stats)
-{
-	bool kthread = (current->flags & PF_KTHREAD) != 0;
-	struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
-	struct moving_context ctxt;
-	struct btree_trans *trans;
-	struct btree_iter iter;
-	struct btree *b;
-	enum btree_id btree;
-	struct data_update_opts data_opts;
-	int ret = 0;
-
-	bch2_moving_ctxt_init(&ctxt, c, NULL, stats,
-			      writepoint_ptr(&c->btree_write_point),
-			      true);
-	trans = ctxt.trans;
-
-	stats->data_type = BCH_DATA_btree;
-
-	for (btree = start.btree;
-	     btree <= min_t(unsigned, end.btree, btree_id_nr_alive(c) - 1);
-	     btree ++) {
-		stats->pos = BBPOS(btree, POS_MIN);
-
-		if (!bch2_btree_id_root(c, btree)->b)
-			continue;
-
-		bch2_trans_node_iter_init(trans, &iter, btree, POS_MIN, 0, 0,
-					  BTREE_ITER_PREFETCH);
-retry:
-		ret = 0;
-		while (bch2_trans_begin(trans),
-		       (b = bch2_btree_iter_peek_node(&iter)) &&
-		       !(ret = PTR_ERR_OR_ZERO(b))) {
-			if (kthread && kthread_should_stop())
-				break;
-
-			if ((cmp_int(btree, end.btree) ?:
-			     bpos_cmp(b->key.k.p, end.pos)) > 0)
-				break;
-
-			stats->pos = BBPOS(iter.btree_id, iter.pos);
-
-			if (!pred(c, arg, b, &io_opts, &data_opts))
-				goto next;
-
-			ret = bch2_btree_node_rewrite(trans, &iter, b, 0) ?: ret;
-			if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-				continue;
-			if (ret)
-				break;
-next:
-			bch2_btree_iter_next_node(&iter);
-		}
-		if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-			goto retry;
-
-		bch2_trans_iter_exit(trans, &iter);
-
-		if (kthread && kthread_should_stop())
-			break;
-	}
-
-	bch_err_fn(c, ret);
-	bch2_moving_ctxt_exit(&ctxt);
-	bch2_btree_interior_updates_flush(c);
-
-	return ret;
-}
-
-static bool rereplicate_pred(struct bch_fs *c, void *arg,
-			     struct bkey_s_c k,
-			     struct bch_io_opts *io_opts,
-			     struct data_update_opts *data_opts)
-{
-	unsigned nr_good = bch2_bkey_durability(c, k);
-	unsigned replicas = bkey_is_btree_ptr(k.k)
-		? c->opts.metadata_replicas
-		: io_opts->data_replicas;
-
-	if (!nr_good || nr_good >= replicas)
-		return false;
-
-	data_opts->target		= 0;
-	data_opts->extra_replicas	= replicas - nr_good;
-	data_opts->btree_insert_flags	= 0;
-	return true;
-}
-
-static bool migrate_pred(struct bch_fs *c, void *arg,
-			 struct bkey_s_c k,
-			 struct bch_io_opts *io_opts,
-			 struct data_update_opts *data_opts)
-{
-	struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
-	struct bch_ioctl_data *op = arg;
-	unsigned i = 0;
-
-	data_opts->rewrite_ptrs		= 0;
-	data_opts->target		= 0;
-	data_opts->extra_replicas	= 0;
-	data_opts->btree_insert_flags	= 0;
-
-	bkey_for_each_ptr(ptrs, ptr) {
-		if (ptr->dev == op->migrate.dev)
-			data_opts->rewrite_ptrs |= 1U << i;
-		i++;
-	}
-
-	return data_opts->rewrite_ptrs != 0;
-}
-
-static bool rereplicate_btree_pred(struct bch_fs *c, void *arg,
-				   struct btree *b,
-				   struct bch_io_opts *io_opts,
-				   struct data_update_opts *data_opts)
-{
-	return rereplicate_pred(c, arg, bkey_i_to_s_c(&b->key), io_opts, data_opts);
-}
-
-static bool migrate_btree_pred(struct bch_fs *c, void *arg,
-			       struct btree *b,
-			       struct bch_io_opts *io_opts,
-			       struct data_update_opts *data_opts)
-{
-	return migrate_pred(c, arg, bkey_i_to_s_c(&b->key), io_opts, data_opts);
-}
-
-static bool bformat_needs_redo(struct bkey_format *f)
-{
-	unsigned i;
-
-	for (i = 0; i < f->nr_fields; i++) {
-		unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
-		u64 unpacked_mask = ~((~0ULL << 1) << (unpacked_bits - 1));
-		u64 field_offset = le64_to_cpu(f->field_offset[i]);
-
-		if (f->bits_per_field[i] > unpacked_bits)
-			return true;
-
-		if ((f->bits_per_field[i] == unpacked_bits) && field_offset)
-			return true;
-
-		if (((field_offset + ((1ULL << f->bits_per_field[i]) - 1)) &
-		     unpacked_mask) <
-		    field_offset)
-			return true;
-	}
-
-	return false;
-}
-
-static bool rewrite_old_nodes_pred(struct bch_fs *c, void *arg,
-				   struct btree *b,
-				   struct bch_io_opts *io_opts,
-				   struct data_update_opts *data_opts)
-{
-	if (b->version_ondisk != c->sb.version ||
-	    btree_node_need_rewrite(b) ||
-	    bformat_needs_redo(&b->format)) {
-		data_opts->target		= 0;
-		data_opts->extra_replicas	= 0;
-		data_opts->btree_insert_flags	= 0;
-		return true;
-	}
-
-	return false;
-}
-
-int bch2_scan_old_btree_nodes(struct bch_fs *c, struct bch_move_stats *stats)
-{
-	int ret;
-
-	ret = bch2_move_btree(c,
-			      BBPOS_MIN,
-			      BBPOS_MAX,
-			      rewrite_old_nodes_pred, c, stats);
-	if (!ret) {
-		mutex_lock(&c->sb_lock);
-		c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_extents_above_btree_updates_done);
-		c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_bformat_overflow_done);
-		c->disk_sb.sb->version_min = c->disk_sb.sb->version;
-		bch2_write_super(c);
-		mutex_unlock(&c->sb_lock);
-	}
-
-	bch_err_fn(c, ret);
-	return ret;
-}
-
-static bool drop_extra_replicas_pred(struct bch_fs *c, void *arg,
-			     struct bkey_s_c k,
-			     struct bch_io_opts *io_opts,
-			     struct data_update_opts *data_opts)
-{
-	unsigned durability = bch2_bkey_durability(c, k);
-	unsigned replicas = bkey_is_btree_ptr(k.k)
-		? c->opts.metadata_replicas
-		: io_opts->data_replicas;
-	const union bch_extent_entry *entry;
-	struct extent_ptr_decoded p;
-	unsigned i = 0;
-
-	bkey_for_each_ptr_decode(k.k, bch2_bkey_ptrs_c(k), p, entry) {
-		unsigned d = bch2_extent_ptr_durability(c, &p);
-
-		if (d && durability - d >= replicas) {
-			data_opts->kill_ptrs |= BIT(i);
-			durability -= d;
-		}
-
-		i++;
-	}
-
-	return data_opts->kill_ptrs != 0;
-}
-
-static bool drop_extra_replicas_btree_pred(struct bch_fs *c, void *arg,
-				   struct btree *b,
-				   struct bch_io_opts *io_opts,
-				   struct data_update_opts *data_opts)
-{
-	return drop_extra_replicas_pred(c, arg, bkey_i_to_s_c(&b->key), io_opts, data_opts);
-}
-
-int bch2_data_job(struct bch_fs *c,
-		  struct bch_move_stats *stats,
-		  struct bch_ioctl_data op)
-{
-	struct bbpos start	= BBPOS(op.start_btree, op.start_pos);
-	struct bbpos end	= BBPOS(op.end_btree, op.end_pos);
-	int ret = 0;
-
-	if (op.op >= BCH_DATA_OP_NR)
-		return -EINVAL;
-
-	bch2_move_stats_init(stats, bch2_data_ops_strs[op.op]);
-
-	switch (op.op) {
-	case BCH_DATA_OP_rereplicate:
-		stats->data_type = BCH_DATA_journal;
-		ret = bch2_journal_flush_device_pins(&c->journal, -1);
-		ret = bch2_move_btree(c, start, end,
-				      rereplicate_btree_pred, c, stats) ?: ret;
-		ret = bch2_move_data(c, start, end,
-				     NULL,
-				     stats,
-				     writepoint_hashed((unsigned long) current),
-				     true,
-				     rereplicate_pred, c) ?: ret;
-		ret = bch2_replicas_gc2(c) ?: ret;
-		break;
-	case BCH_DATA_OP_migrate:
-		if (op.migrate.dev >= c->sb.nr_devices)
-			return -EINVAL;
-
-		stats->data_type = BCH_DATA_journal;
-		ret = bch2_journal_flush_device_pins(&c->journal, op.migrate.dev);
-		ret = bch2_move_btree(c, start, end,
-				      migrate_btree_pred, &op, stats) ?: ret;
-		ret = bch2_move_data(c, start, end,
-				     NULL,
-				     stats,
-				     writepoint_hashed((unsigned long) current),
-				     true,
-				     migrate_pred, &op) ?: ret;
-		ret = bch2_replicas_gc2(c) ?: ret;
-		break;
-	case BCH_DATA_OP_rewrite_old_nodes:
-		ret = bch2_scan_old_btree_nodes(c, stats);
-		break;
-	case BCH_DATA_OP_drop_extra_replicas:
-		ret = bch2_move_btree(c, start, end,
-				drop_extra_replicas_btree_pred, c, stats) ?: ret;
-		ret = bch2_move_data(c, start, end, NULL, stats,
-				writepoint_hashed((unsigned long) current),
-				true,
-				drop_extra_replicas_pred, c) ?: ret;
-		ret = bch2_replicas_gc2(c) ?: ret;
-		break;
-	default:
-		ret = -EINVAL;
-	}
-
-	bch2_move_stats_exit(stats, c);
-	return ret;
-}
-
-void bch2_move_stats_to_text(struct printbuf *out, struct bch_move_stats *stats)
-{
-	prt_printf(out, "%s: data type=%s pos=",
-		   stats->name,
-		   bch2_data_types[stats->data_type]);
-	bch2_bbpos_to_text(out, stats->pos);
-	prt_newline(out);
-	printbuf_indent_add(out, 2);
-
-	prt_str(out, "keys moved:  ");
-	prt_u64(out, atomic64_read(&stats->keys_moved));
-	prt_newline(out);
-
-	prt_str(out, "keys raced:  ");
-	prt_u64(out, atomic64_read(&stats->keys_raced));
-	prt_newline(out);
-
-	prt_str(out, "bytes seen:  ");
-	prt_human_readable_u64(out, atomic64_read(&stats->sectors_seen) << 9);
-	prt_newline(out);
-
-	prt_str(out, "bytes moved: ");
-	prt_human_readable_u64(out, atomic64_read(&stats->sectors_moved) << 9);
-	prt_newline(out);
-
-	prt_str(out, "bytes raced: ");
-	prt_human_readable_u64(out, atomic64_read(&stats->sectors_raced) << 9);
-	prt_newline(out);
-
-	printbuf_indent_sub(out, 2);
-}
-
-static void bch2_moving_ctxt_to_text(struct printbuf *out, struct bch_fs *c, struct moving_context *ctxt)
-{
-	struct moving_io *io;
-
-	bch2_move_stats_to_text(out, ctxt->stats);
-	printbuf_indent_add(out, 2);
-
-	prt_printf(out, "reads: ios %u/%u sectors %u/%u",
-		   atomic_read(&ctxt->read_ios),
-		   c->opts.move_ios_in_flight,
-		   atomic_read(&ctxt->read_sectors),
-		   c->opts.move_bytes_in_flight >> 9);
-	prt_newline(out);
-
-	prt_printf(out, "writes: ios %u/%u sectors %u/%u",
-		   atomic_read(&ctxt->write_ios),
-		   c->opts.move_ios_in_flight,
-		   atomic_read(&ctxt->write_sectors),
-		   c->opts.move_bytes_in_flight >> 9);
-	prt_newline(out);
-
-	printbuf_indent_add(out, 2);
-
-	mutex_lock(&ctxt->lock);
-	list_for_each_entry(io, &ctxt->ios, io_list)
-		bch2_write_op_to_text(out, &io->write.op);
-	mutex_unlock(&ctxt->lock);
-
-	printbuf_indent_sub(out, 4);
-}
-
-void bch2_fs_moving_ctxts_to_text(struct printbuf *out, struct bch_fs *c)
-{
-	struct moving_context *ctxt;
-
-	mutex_lock(&c->moving_context_lock);
-	list_for_each_entry(ctxt, &c->moving_context_list, list)
-		bch2_moving_ctxt_to_text(out, c, ctxt);
-	mutex_unlock(&c->moving_context_lock);
-}
-
-void bch2_fs_move_init(struct bch_fs *c)
-{
-	INIT_LIST_HEAD(&c->moving_context_list);
-	mutex_init(&c->moving_context_lock);
-}