Move c_src dirs back to toplevel

We just wanted c sourcefiles out of the top level, not c source
directories.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 0 insertions, 2124 deletions

diff --git a/c_src/libbcachefs/super.c b/c_src/libbcachefs/super.c
deleted file mode 100644
index 9dbc3594..00000000
--- a/c_src/libbcachefs/super.c
+++ /dev/null
@@ -1,2124 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * bcachefs setup/teardown code, and some metadata io - read a superblock and
- * figure out what to do with it.
- *
- * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
- * Copyright 2012 Google, Inc.
- */
-
-#include "bcachefs.h"
-#include "alloc_background.h"
-#include "alloc_foreground.h"
-#include "bkey_sort.h"
-#include "btree_cache.h"
-#include "btree_gc.h"
-#include "btree_journal_iter.h"
-#include "btree_key_cache.h"
-#include "btree_update_interior.h"
-#include "btree_io.h"
-#include "btree_write_buffer.h"
-#include "buckets_waiting_for_journal.h"
-#include "chardev.h"
-#include "checksum.h"
-#include "clock.h"
-#include "compress.h"
-#include "counters.h"
-#include "debug.h"
-#include "disk_groups.h"
-#include "ec.h"
-#include "errcode.h"
-#include "error.h"
-#include "fs.h"
-#include "fs-io.h"
-#include "fs-io-buffered.h"
-#include "fs-io-direct.h"
-#include "fsck.h"
-#include "inode.h"
-#include "io_read.h"
-#include "io_write.h"
-#include "journal.h"
-#include "journal_reclaim.h"
-#include "journal_seq_blacklist.h"
-#include "move.h"
-#include "migrate.h"
-#include "movinggc.h"
-#include "nocow_locking.h"
-#include "quota.h"
-#include "rebalance.h"
-#include "recovery.h"
-#include "replicas.h"
-#include "sb-clean.h"
-#include "sb-errors.h"
-#include "sb-members.h"
-#include "snapshot.h"
-#include "subvolume.h"
-#include "super.h"
-#include "super-io.h"
-#include "sysfs.h"
-#include "trace.h"
-
-#include <linux/backing-dev.h>
-#include <linux/blkdev.h>
-#include <linux/debugfs.h>
-#include <linux/device.h>
-#include <linux/idr.h>
-#include <linux/module.h>
-#include <linux/percpu.h>
-#include <linux/random.h>
-#include <linux/sysfs.h>
-#include <crypto/hash.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Kent Overstreet <kent.overstreet@gmail.com>");
-MODULE_DESCRIPTION("bcachefs filesystem");
-MODULE_SOFTDEP("pre: crc32c");
-MODULE_SOFTDEP("pre: crc64");
-MODULE_SOFTDEP("pre: sha256");
-MODULE_SOFTDEP("pre: chacha20");
-MODULE_SOFTDEP("pre: poly1305");
-MODULE_SOFTDEP("pre: xxhash");
-
-const char * const bch2_fs_flag_strs[] = {
-#define x(n)		#n,
-	BCH_FS_FLAGS()
-#undef x
-	NULL
-};
-
-void __bch2_print(struct bch_fs *c, const char *fmt, ...)
-{
-	struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c);
-
-	va_list args;
-	va_start(args, fmt);
-	if (likely(!stdio)) {
-		vprintk(fmt, args);
-	} else {
-		unsigned long flags;
-
-		if (fmt[0] == KERN_SOH[0])
-			fmt += 2;
-
-		spin_lock_irqsave(&stdio->output_lock, flags);
-		prt_vprintf(&stdio->output_buf, fmt, args);
-		spin_unlock_irqrestore(&stdio->output_lock, flags);
-
-		wake_up(&stdio->output_wait);
-	}
-	va_end(args);
-}
-
-#define KTYPE(type)							\
-static const struct attribute_group type ## _group = {			\
-	.attrs = type ## _files						\
-};									\
-									\
-static const struct attribute_group *type ## _groups[] = {		\
-	&type ## _group,						\
-	NULL								\
-};									\
-									\
-static const struct kobj_type type ## _ktype = {			\
-	.release	= type ## _release,				\
-	.sysfs_ops	= &type ## _sysfs_ops,				\
-	.default_groups = type ## _groups				\
-}
-
-static void bch2_fs_release(struct kobject *);
-static void bch2_dev_release(struct kobject *);
-static void bch2_fs_counters_release(struct kobject *k)
-{
-}
-
-static void bch2_fs_internal_release(struct kobject *k)
-{
-}
-
-static void bch2_fs_opts_dir_release(struct kobject *k)
-{
-}
-
-static void bch2_fs_time_stats_release(struct kobject *k)
-{
-}
-
-KTYPE(bch2_fs);
-KTYPE(bch2_fs_counters);
-KTYPE(bch2_fs_internal);
-KTYPE(bch2_fs_opts_dir);
-KTYPE(bch2_fs_time_stats);
-KTYPE(bch2_dev);
-
-static struct kset *bcachefs_kset;
-static LIST_HEAD(bch_fs_list);
-static DEFINE_MUTEX(bch_fs_list_lock);
-
-DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);
-
-static void bch2_dev_free(struct bch_dev *);
-static int bch2_dev_alloc(struct bch_fs *, unsigned);
-static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
-static void __bch2_dev_read_only(struct bch_fs *, struct bch_dev *);
-
-struct bch_fs *bch2_dev_to_fs(dev_t dev)
-{
-	struct bch_fs *c;
-
-	mutex_lock(&bch_fs_list_lock);
-	rcu_read_lock();
-
-	list_for_each_entry(c, &bch_fs_list, list)
-		for_each_member_device_rcu(c, ca, NULL)
-			if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
-				closure_get(&c->cl);
-				goto found;
-			}
-	c = NULL;
-found:
-	rcu_read_unlock();
-	mutex_unlock(&bch_fs_list_lock);
-
-	return c;
-}
-
-static struct bch_fs *__bch2_uuid_to_fs(__uuid_t uuid)
-{
-	struct bch_fs *c;
-
-	lockdep_assert_held(&bch_fs_list_lock);
-
-	list_for_each_entry(c, &bch_fs_list, list)
-		if (!memcmp(&c->disk_sb.sb->uuid, &uuid, sizeof(uuid)))
-			return c;
-
-	return NULL;
-}
-
-struct bch_fs *bch2_uuid_to_fs(__uuid_t uuid)
-{
-	struct bch_fs *c;
-
-	mutex_lock(&bch_fs_list_lock);
-	c = __bch2_uuid_to_fs(uuid);
-	if (c)
-		closure_get(&c->cl);
-	mutex_unlock(&bch_fs_list_lock);
-
-	return c;
-}
-
-static void bch2_dev_usage_journal_reserve(struct bch_fs *c)
-{
-	unsigned nr = 0, u64s =
-		((sizeof(struct jset_entry_dev_usage) +
-		  sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR)) /
-		sizeof(u64);
-
-	rcu_read_lock();
-	for_each_member_device_rcu(c, ca, NULL)
-		nr++;
-	rcu_read_unlock();
-
-	bch2_journal_entry_res_resize(&c->journal,
-			&c->dev_usage_journal_res, u64s * nr);
-}
-
-/* Filesystem RO/RW: */
-
-/*
- * For startup/shutdown of RW stuff, the dependencies are:
- *
- * - foreground writes depend on copygc and rebalance (to free up space)
- *
- * - copygc and rebalance depend on mark and sweep gc (they actually probably
- *   don't because they either reserve ahead of time or don't block if
- *   allocations fail, but allocations can require mark and sweep gc to run
- *   because of generation number wraparound)
- *
- * - all of the above depends on the allocator threads
- *
- * - allocator depends on the journal (when it rewrites prios and gens)
- */
-
-static void __bch2_fs_read_only(struct bch_fs *c)
-{
-	unsigned clean_passes = 0;
-	u64 seq = 0;
-
-	bch2_fs_ec_stop(c);
-	bch2_open_buckets_stop(c, NULL, true);
-	bch2_rebalance_stop(c);
-	bch2_copygc_stop(c);
-	bch2_gc_thread_stop(c);
-	bch2_fs_ec_flush(c);
-
-	bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",
-		    journal_cur_seq(&c->journal));
-
-	do {
-		clean_passes++;
-
-		if (bch2_btree_interior_updates_flush(c) ||
-		    bch2_journal_flush_all_pins(&c->journal) ||
-		    bch2_btree_flush_all_writes(c) ||
-		    seq != atomic64_read(&c->journal.seq)) {
-			seq = atomic64_read(&c->journal.seq);
-			clean_passes = 0;
-		}
-	} while (clean_passes < 2);
-
-	bch_verbose(c, "flushing journal and stopping allocators complete, journal seq %llu",
-		    journal_cur_seq(&c->journal));
-
-	if (test_bit(JOURNAL_REPLAY_DONE, &c->journal.flags) &&
-	    !test_bit(BCH_FS_emergency_ro, &c->flags))
-		set_bit(BCH_FS_clean_shutdown, &c->flags);
-	bch2_fs_journal_stop(&c->journal);
-
-	/*
-	 * After stopping journal:
-	 */
-	for_each_member_device(c, ca)
-		bch2_dev_allocator_remove(c, ca);
-}
-
-#ifndef BCH_WRITE_REF_DEBUG
-static void bch2_writes_disabled(struct percpu_ref *writes)
-{
-	struct bch_fs *c = container_of(writes, struct bch_fs, writes);
-
-	set_bit(BCH_FS_write_disable_complete, &c->flags);
-	wake_up(&bch2_read_only_wait);
-}
-#endif
-
-void bch2_fs_read_only(struct bch_fs *c)
-{
-	if (!test_bit(BCH_FS_rw, &c->flags)) {
-		bch2_journal_reclaim_stop(&c->journal);
-		return;
-	}
-
-	BUG_ON(test_bit(BCH_FS_write_disable_complete, &c->flags));
-
-	bch_verbose(c, "going read-only");
-
-	/*
-	 * Block new foreground-end write operations from starting - any new
-	 * writes will return -EROFS:
-	 */
-	set_bit(BCH_FS_going_ro, &c->flags);
-#ifndef BCH_WRITE_REF_DEBUG
-	percpu_ref_kill(&c->writes);
-#else
-	for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++)
-		bch2_write_ref_put(c, i);
-#endif
-
-	/*
-	 * If we're not doing an emergency shutdown, we want to wait on
-	 * outstanding writes to complete so they don't see spurious errors due
-	 * to shutting down the allocator:
-	 *
-	 * If we are doing an emergency shutdown outstanding writes may
-	 * hang until we shutdown the allocator so we don't want to wait
-	 * on outstanding writes before shutting everything down - but
-	 * we do need to wait on them before returning and signalling
-	 * that going RO is complete:
-	 */
-	wait_event(bch2_read_only_wait,
-		   test_bit(BCH_FS_write_disable_complete, &c->flags) ||
-		   test_bit(BCH_FS_emergency_ro, &c->flags));
-
-	bool writes_disabled = test_bit(BCH_FS_write_disable_complete, &c->flags);
-	if (writes_disabled)
-		bch_verbose(c, "finished waiting for writes to stop");
-
-	__bch2_fs_read_only(c);
-
-	wait_event(bch2_read_only_wait,
-		   test_bit(BCH_FS_write_disable_complete, &c->flags));
-
-	if (!writes_disabled)
-		bch_verbose(c, "finished waiting for writes to stop");
-
-	clear_bit(BCH_FS_write_disable_complete, &c->flags);
-	clear_bit(BCH_FS_going_ro, &c->flags);
-	clear_bit(BCH_FS_rw, &c->flags);
-
-	if (!bch2_journal_error(&c->journal) &&
-	    !test_bit(BCH_FS_error, &c->flags) &&
-	    !test_bit(BCH_FS_emergency_ro, &c->flags) &&
-	    test_bit(BCH_FS_started, &c->flags) &&
-	    test_bit(BCH_FS_clean_shutdown, &c->flags) &&
-	    !c->opts.norecovery) {
-		BUG_ON(c->journal.last_empty_seq != journal_cur_seq(&c->journal));
-		BUG_ON(atomic_read(&c->btree_cache.dirty));
-		BUG_ON(atomic_long_read(&c->btree_key_cache.nr_dirty));
-		BUG_ON(c->btree_write_buffer.inc.keys.nr);
-		BUG_ON(c->btree_write_buffer.flushing.keys.nr);
-
-		bch_verbose(c, "marking filesystem clean");
-		bch2_fs_mark_clean(c);
-	} else {
-		bch_verbose(c, "done going read-only, filesystem not clean");
-	}
-}
-
-static void bch2_fs_read_only_work(struct work_struct *work)
-{
-	struct bch_fs *c =
-		container_of(work, struct bch_fs, read_only_work);
-
-	down_write(&c->state_lock);
-	bch2_fs_read_only(c);
-	up_write(&c->state_lock);
-}
-
-static void bch2_fs_read_only_async(struct bch_fs *c)
-{
-	queue_work(system_long_wq, &c->read_only_work);
-}
-
-bool bch2_fs_emergency_read_only(struct bch_fs *c)
-{
-	bool ret = !test_and_set_bit(BCH_FS_emergency_ro, &c->flags);
-
-	bch2_journal_halt(&c->journal);
-	bch2_fs_read_only_async(c);
-
-	wake_up(&bch2_read_only_wait);
-	return ret;
-}
-
-static int bch2_fs_read_write_late(struct bch_fs *c)
-{
-	int ret;
-
-	/*
-	 * Data move operations can't run until after check_snapshots has
-	 * completed, and bch2_snapshot_is_ancestor() is available.
-	 *
-	 * Ideally we'd start copygc/rebalance earlier instead of waiting for
-	 * all of recovery/fsck to complete:
-	 */
-	ret = bch2_copygc_start(c);
-	if (ret) {
-		bch_err(c, "error starting copygc thread");
-		return ret;
-	}
-
-	ret = bch2_rebalance_start(c);
-	if (ret) {
-		bch_err(c, "error starting rebalance thread");
-		return ret;
-	}
-
-	return 0;
-}
-
-static int __bch2_fs_read_write(struct bch_fs *c, bool early)
-{
-	int ret;
-
-	if (test_bit(BCH_FS_initial_gc_unfixed, &c->flags)) {
-		bch_err(c, "cannot go rw, unfixed btree errors");
-		return -BCH_ERR_erofs_unfixed_errors;
-	}
-
-	if (test_bit(BCH_FS_rw, &c->flags))
-		return 0;
-
-	bch_info(c, "going read-write");
-
-	ret = bch2_sb_members_v2_init(c);
-	if (ret)
-		goto err;
-
-	ret = bch2_fs_mark_dirty(c);
-	if (ret)
-		goto err;
-
-	clear_bit(BCH_FS_clean_shutdown, &c->flags);
-
-	/*
-	 * First journal write must be a flush write: after a clean shutdown we
-	 * don't read the journal, so the first journal write may end up
-	 * overwriting whatever was there previously, and there must always be
-	 * at least one non-flush write in the journal or recovery will fail:
-	 */
-	set_bit(JOURNAL_NEED_FLUSH_WRITE, &c->journal.flags);
-
-	for_each_rw_member(c, ca)
-		bch2_dev_allocator_add(c, ca);
-	bch2_recalc_capacity(c);
-
-	set_bit(BCH_FS_rw, &c->flags);
-	set_bit(BCH_FS_was_rw, &c->flags);
-
-#ifndef BCH_WRITE_REF_DEBUG
-	percpu_ref_reinit(&c->writes);
-#else
-	for (unsigned i = 0; i < BCH_WRITE_REF_NR; i++) {
-		BUG_ON(atomic_long_read(&c->writes[i]));
-		atomic_long_inc(&c->writes[i]);
-	}
-#endif
-
-	ret = bch2_gc_thread_start(c);
-	if (ret) {
-		bch_err(c, "error starting gc thread");
-		return ret;
-	}
-
-	ret = bch2_journal_reclaim_start(&c->journal);
-	if (ret)
-		goto err;
-
-	if (!early) {
-		ret = bch2_fs_read_write_late(c);
-		if (ret)
-			goto err;
-	}
-
-	bch2_do_discards(c);
-	bch2_do_invalidates(c);
-	bch2_do_stripe_deletes(c);
-	bch2_do_pending_node_rewrites(c);
-	return 0;
-err:
-	if (test_bit(BCH_FS_rw, &c->flags))
-		bch2_fs_read_only(c);
-	else
-		__bch2_fs_read_only(c);
-	return ret;
-}
-
-int bch2_fs_read_write(struct bch_fs *c)
-{
-	if (c->opts.norecovery)
-		return -BCH_ERR_erofs_norecovery;
-
-	if (c->opts.nochanges)
-		return -BCH_ERR_erofs_nochanges;
-
-	return __bch2_fs_read_write(c, false);
-}
-
-int bch2_fs_read_write_early(struct bch_fs *c)
-{
-	lockdep_assert_held(&c->state_lock);
-
-	return __bch2_fs_read_write(c, true);
-}
-
-/* Filesystem startup/shutdown: */
-
-static void __bch2_fs_free(struct bch_fs *c)
-{
-	unsigned i;
-
-	for (i = 0; i < BCH_TIME_STAT_NR; i++)
-		bch2_time_stats_exit(&c->times[i]);
-
-	bch2_free_pending_node_rewrites(c);
-	bch2_fs_sb_errors_exit(c);
-	bch2_fs_counters_exit(c);
-	bch2_fs_snapshots_exit(c);
-	bch2_fs_quota_exit(c);
-	bch2_fs_fs_io_direct_exit(c);
-	bch2_fs_fs_io_buffered_exit(c);
-	bch2_fs_fsio_exit(c);
-	bch2_fs_ec_exit(c);
-	bch2_fs_encryption_exit(c);
-	bch2_fs_nocow_locking_exit(c);
-	bch2_fs_io_write_exit(c);
-	bch2_fs_io_read_exit(c);
-	bch2_fs_buckets_waiting_for_journal_exit(c);
-	bch2_fs_btree_interior_update_exit(c);
-	bch2_fs_btree_iter_exit(c);
-	bch2_fs_btree_key_cache_exit(&c->btree_key_cache);
-	bch2_fs_btree_cache_exit(c);
-	bch2_fs_replicas_exit(c);
-	bch2_fs_journal_exit(&c->journal);
-	bch2_io_clock_exit(&c->io_clock[WRITE]);
-	bch2_io_clock_exit(&c->io_clock[READ]);
-	bch2_fs_compress_exit(c);
-	bch2_journal_keys_put_initial(c);
-	BUG_ON(atomic_read(&c->journal_keys.ref));
-	bch2_fs_btree_write_buffer_exit(c);
-	percpu_free_rwsem(&c->mark_lock);
-	free_percpu(c->online_reserved);
-
-	darray_exit(&c->btree_roots_extra);
-	free_percpu(c->pcpu);
-	mempool_exit(&c->large_bkey_pool);
-	mempool_exit(&c->btree_bounce_pool);
-	bioset_exit(&c->btree_bio);
-	mempool_exit(&c->fill_iter);
-#ifndef BCH_WRITE_REF_DEBUG
-	percpu_ref_exit(&c->writes);
-#endif
-	kfree(rcu_dereference_protected(c->disk_groups, 1));
-	kfree(c->journal_seq_blacklist_table);
-	kfree(c->unused_inode_hints);
-
-	if (c->write_ref_wq)
-		destroy_workqueue(c->write_ref_wq);
-	if (c->io_complete_wq)
-		destroy_workqueue(c->io_complete_wq);
-	if (c->copygc_wq)
-		destroy_workqueue(c->copygc_wq);
-	if (c->btree_io_complete_wq)
-		destroy_workqueue(c->btree_io_complete_wq);
-	if (c->btree_update_wq)
-		destroy_workqueue(c->btree_update_wq);
-
-	bch2_free_super(&c->disk_sb);
-	kvpfree(c, sizeof(*c));
-	module_put(THIS_MODULE);
-}
-
-static void bch2_fs_release(struct kobject *kobj)
-{
-	struct bch_fs *c = container_of(kobj, struct bch_fs, kobj);
-
-	__bch2_fs_free(c);
-}
-
-void __bch2_fs_stop(struct bch_fs *c)
-{
-	bch_verbose(c, "shutting down");
-
-	set_bit(BCH_FS_stopping, &c->flags);
-
-	cancel_work_sync(&c->journal_seq_blacklist_gc_work);
-
-	down_write(&c->state_lock);
-	bch2_fs_read_only(c);
-	up_write(&c->state_lock);
-
-	for_each_member_device(c, ca)
-		if (ca->kobj.state_in_sysfs &&
-		    ca->disk_sb.bdev)
-			sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
-
-	if (c->kobj.state_in_sysfs)
-		kobject_del(&c->kobj);
-
-	bch2_fs_debug_exit(c);
-	bch2_fs_chardev_exit(c);
-
-	bch2_ro_ref_put(c);
-	wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref));
-
-	kobject_put(&c->counters_kobj);
-	kobject_put(&c->time_stats);
-	kobject_put(&c->opts_dir);
-	kobject_put(&c->internal);
-
-	/* btree prefetch might have kicked off reads in the background: */
-	bch2_btree_flush_all_reads(c);
-
-	for_each_member_device(c, ca)
-		cancel_work_sync(&ca->io_error_work);
-
-	cancel_work_sync(&c->read_only_work);
-}
-
-void bch2_fs_free(struct bch_fs *c)
-{
-	unsigned i;
-
-	mutex_lock(&bch_fs_list_lock);
-	list_del(&c->list);
-	mutex_unlock(&bch_fs_list_lock);
-
-	closure_sync(&c->cl);
-	closure_debug_destroy(&c->cl);
-
-	for (i = 0; i < c->sb.nr_devices; i++) {
-		struct bch_dev *ca = rcu_dereference_protected(c->devs[i], true);
-
-		if (ca) {
-			bch2_free_super(&ca->disk_sb);
-			bch2_dev_free(ca);
-		}
-	}
-
-	bch_verbose(c, "shutdown complete");
-
-	kobject_put(&c->kobj);
-}
-
-void bch2_fs_stop(struct bch_fs *c)
-{
-	__bch2_fs_stop(c);
-	bch2_fs_free(c);
-}
-
-static int bch2_fs_online(struct bch_fs *c)
-{
-	int ret = 0;
-
-	lockdep_assert_held(&bch_fs_list_lock);
-
-	if (__bch2_uuid_to_fs(c->sb.uuid)) {
-		bch_err(c, "filesystem UUID already open");
-		return -EINVAL;
-	}
-
-	ret = bch2_fs_chardev_init(c);
-	if (ret) {
-		bch_err(c, "error creating character device");
-		return ret;
-	}
-
-	bch2_fs_debug_init(c);
-
-	ret = kobject_add(&c->kobj, NULL, "%pU", c->sb.user_uuid.b) ?:
-	    kobject_add(&c->internal, &c->kobj, "internal") ?:
-	    kobject_add(&c->opts_dir, &c->kobj, "options") ?:
-#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
-	    kobject_add(&c->time_stats, &c->kobj, "time_stats") ?:
-#endif
-	    kobject_add(&c->counters_kobj, &c->kobj, "counters") ?:
-	    bch2_opts_create_sysfs_files(&c->opts_dir);
-	if (ret) {
-		bch_err(c, "error creating sysfs objects");
-		return ret;
-	}
-
-	down_write(&c->state_lock);
-
-	for_each_member_device(c, ca) {
-		ret = bch2_dev_sysfs_online(c, ca);
-		if (ret) {
-			bch_err(c, "error creating sysfs objects");
-			percpu_ref_put(&ca->ref);
-			goto err;
-		}
-	}
-
-	BUG_ON(!list_empty(&c->list));
-	list_add(&c->list, &bch_fs_list);
-err:
-	up_write(&c->state_lock);
-	return ret;
-}
-
-static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
-{
-	struct bch_fs *c;
-	struct printbuf name = PRINTBUF;
-	unsigned i, iter_size;
-	int ret = 0;
-
-	c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
-	if (!c) {
-		c = ERR_PTR(-BCH_ERR_ENOMEM_fs_alloc);
-		goto out;
-	}
-
-	c->stdio = (void *)(unsigned long) opts.stdio;
-
-	__module_get(THIS_MODULE);
-
-	closure_init(&c->cl, NULL);
-
-	c->kobj.kset = bcachefs_kset;
-	kobject_init(&c->kobj, &bch2_fs_ktype);
-	kobject_init(&c->internal, &bch2_fs_internal_ktype);
-	kobject_init(&c->opts_dir, &bch2_fs_opts_dir_ktype);
-	kobject_init(&c->time_stats, &bch2_fs_time_stats_ktype);
-	kobject_init(&c->counters_kobj, &bch2_fs_counters_ktype);
-
-	c->minor		= -1;
-	c->disk_sb.fs_sb	= true;
-
-	init_rwsem(&c->state_lock);
-	mutex_init(&c->sb_lock);
-	mutex_init(&c->replicas_gc_lock);
-	mutex_init(&c->btree_root_lock);
-	INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
-
-	refcount_set(&c->ro_ref, 1);
-	init_waitqueue_head(&c->ro_ref_wait);
-	sema_init(&c->online_fsck_mutex, 1);
-
-	init_rwsem(&c->gc_lock);
-	mutex_init(&c->gc_gens_lock);
-	atomic_set(&c->journal_keys.ref, 1);
-	c->journal_keys.initial_ref_held = true;
-
-	for (i = 0; i < BCH_TIME_STAT_NR; i++)
-		bch2_time_stats_init(&c->times[i]);
-
-	bch2_fs_copygc_init(c);
-	bch2_fs_btree_key_cache_init_early(&c->btree_key_cache);
-	bch2_fs_btree_iter_init_early(c);
-	bch2_fs_btree_interior_update_init_early(c);
-	bch2_fs_allocator_background_init(c);
-	bch2_fs_allocator_foreground_init(c);
-	bch2_fs_rebalance_init(c);
-	bch2_fs_quota_init(c);
-	bch2_fs_ec_init_early(c);
-	bch2_fs_move_init(c);
-	bch2_fs_sb_errors_init_early(c);
-
-	INIT_LIST_HEAD(&c->list);
-
-	mutex_init(&c->usage_scratch_lock);
-
-	mutex_init(&c->bio_bounce_pages_lock);
-	mutex_init(&c->snapshot_table_lock);
-	init_rwsem(&c->snapshot_create_lock);
-
-	spin_lock_init(&c->btree_write_error_lock);
-
-	INIT_WORK(&c->journal_seq_blacklist_gc_work,
-		  bch2_blacklist_entries_gc);
-
-	INIT_LIST_HEAD(&c->journal_iters);
-
-	INIT_LIST_HEAD(&c->fsck_error_msgs);
-	mutex_init(&c->fsck_error_msgs_lock);
-
-	seqcount_init(&c->gc_pos_lock);
-
-	seqcount_init(&c->usage_lock);
-
-	sema_init(&c->io_in_flight, 128);
-
-	INIT_LIST_HEAD(&c->vfs_inodes_list);
-	mutex_init(&c->vfs_inodes_lock);
-
-	c->copy_gc_enabled		= 1;
-	c->rebalance.enabled		= 1;
-	c->promote_whole_extents	= true;
-
-	c->journal.flush_write_time	= &c->times[BCH_TIME_journal_flush_write];
-	c->journal.noflush_write_time	= &c->times[BCH_TIME_journal_noflush_write];
-	c->journal.flush_seq_time	= &c->times[BCH_TIME_journal_flush_seq];
-
-	bch2_fs_btree_cache_init_early(&c->btree_cache);
-
-	mutex_init(&c->sectors_available_lock);
-
-	ret = percpu_init_rwsem(&c->mark_lock);
-	if (ret)
-		goto err;
-
-	mutex_lock(&c->sb_lock);
-	ret = bch2_sb_to_fs(c, sb);
-	mutex_unlock(&c->sb_lock);
-
-	if (ret)
-		goto err;
-
-	pr_uuid(&name, c->sb.user_uuid.b);
-	strscpy(c->name, name.buf, sizeof(c->name));
-	printbuf_exit(&name);
-
-	ret = name.allocation_failure ? -BCH_ERR_ENOMEM_fs_name_alloc : 0;
-	if (ret)
-		goto err;
-
-	/* Compat: */
-	if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
-	    !BCH_SB_JOURNAL_FLUSH_DELAY(sb))
-		SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
-
-	if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_inode_v2 &&
-	    !BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
-		SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 100);
-
-	c->opts = bch2_opts_default;
-	ret = bch2_opts_from_sb(&c->opts, sb);
-	if (ret)
-		goto err;
-
-	bch2_opts_apply(&c->opts, opts);
-
-	c->btree_key_cache_btrees |= 1U << BTREE_ID_alloc;
-	if (c->opts.inodes_use_key_cache)
-		c->btree_key_cache_btrees |= 1U << BTREE_ID_inodes;
-	c->btree_key_cache_btrees |= 1U << BTREE_ID_logged_ops;
-
-	c->block_bits		= ilog2(block_sectors(c));
-	c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
-
-	if (bch2_fs_init_fault("fs_alloc")) {
-		bch_err(c, "fs_alloc fault injected");
-		ret = -EFAULT;
-		goto err;
-	}
-
-	iter_size = sizeof(struct sort_iter) +
-		(btree_blocks(c) + 1) * 2 *
-		sizeof(struct sort_iter_set);
-
-	c->inode_shard_bits = ilog2(roundup_pow_of_two(num_possible_cpus()));
-
-	if (!(c->btree_update_wq = alloc_workqueue("bcachefs",
-				WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512)) ||
-	    !(c->btree_io_complete_wq = alloc_workqueue("bcachefs_btree_io",
-				WQ_FREEZABLE|WQ_MEM_RECLAIM, 1)) ||
-	    !(c->copygc_wq = alloc_workqueue("bcachefs_copygc",
-				WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 1)) ||
-	    !(c->io_complete_wq = alloc_workqueue("bcachefs_io",
-				WQ_FREEZABLE|WQ_HIGHPRI|WQ_MEM_RECLAIM, 512)) ||
-	    !(c->write_ref_wq = alloc_workqueue("bcachefs_write_ref",
-				WQ_FREEZABLE, 0)) ||
-#ifndef BCH_WRITE_REF_DEBUG
-	    percpu_ref_init(&c->writes, bch2_writes_disabled,
-			    PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
-#endif
-	    mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||
-	    bioset_init(&c->btree_bio, 1,
-			max(offsetof(struct btree_read_bio, bio),
-			    offsetof(struct btree_write_bio, wbio.bio)),
-			BIOSET_NEED_BVECS) ||
-	    !(c->pcpu = alloc_percpu(struct bch_fs_pcpu)) ||
-	    !(c->online_reserved = alloc_percpu(u64)) ||
-	    mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
-					btree_bytes(c)) ||
-	    mempool_init_kmalloc_pool(&c->large_bkey_pool, 1, 2048) ||
-	    !(c->unused_inode_hints = kcalloc(1U << c->inode_shard_bits,
-					      sizeof(u64), GFP_KERNEL))) {
-		ret = -BCH_ERR_ENOMEM_fs_other_alloc;
-		goto err;
-	}
-
-	ret = bch2_fs_counters_init(c) ?:
-	    bch2_fs_sb_errors_init(c) ?:
-	    bch2_io_clock_init(&c->io_clock[READ]) ?:
-	    bch2_io_clock_init(&c->io_clock[WRITE]) ?:
-	    bch2_fs_journal_init(&c->journal) ?:
-	    bch2_fs_replicas_init(c) ?:
-	    bch2_fs_btree_cache_init(c) ?:
-	    bch2_fs_btree_key_cache_init(&c->btree_key_cache) ?:
-	    bch2_fs_btree_iter_init(c) ?:
-	    bch2_fs_btree_interior_update_init(c) ?:
-	    bch2_fs_buckets_waiting_for_journal_init(c) ?:
-	    bch2_fs_btree_write_buffer_init(c) ?:
-	    bch2_fs_subvolumes_init(c) ?:
-	    bch2_fs_io_read_init(c) ?:
-	    bch2_fs_io_write_init(c) ?:
-	    bch2_fs_nocow_locking_init(c) ?:
-	    bch2_fs_encryption_init(c) ?:
-	    bch2_fs_compress_init(c) ?:
-	    bch2_fs_ec_init(c) ?:
-	    bch2_fs_fsio_init(c) ?:
-	    bch2_fs_fs_io_buffered_init(c) ?:
-	    bch2_fs_fs_io_direct_init(c);
-	if (ret)
-		goto err;
-
-	for (i = 0; i < c->sb.nr_devices; i++)
-		if (bch2_dev_exists(c->disk_sb.sb, i) &&
-		    bch2_dev_alloc(c, i)) {
-			ret = -EEXIST;
-			goto err;
-		}
-
-	bch2_journal_entry_res_resize(&c->journal,
-			&c->btree_root_journal_res,
-			BTREE_ID_NR * (JSET_KEYS_U64s + BKEY_BTREE_PTR_U64s_MAX));
-	bch2_dev_usage_journal_reserve(c);
-	bch2_journal_entry_res_resize(&c->journal,
-			&c->clock_journal_res,
-			(sizeof(struct jset_entry_clock) / sizeof(u64)) * 2);
-
-	mutex_lock(&bch_fs_list_lock);
-	ret = bch2_fs_online(c);
-	mutex_unlock(&bch_fs_list_lock);
-
-	if (ret)
-		goto err;
-out:
-	return c;
-err:
-	bch2_fs_free(c);
-	c = ERR_PTR(ret);
-	goto out;
-}
-
-noinline_for_stack
-static void print_mount_opts(struct bch_fs *c)
-{
-	enum bch_opt_id i;
-	struct printbuf p = PRINTBUF;
-	bool first = true;
-
-	prt_str(&p, "mounting version ");
-	bch2_version_to_text(&p, c->sb.version);
-
-	if (c->opts.read_only) {
-		prt_str(&p, " opts=");
-		first = false;
-		prt_printf(&p, "ro");
-	}
-
-	for (i = 0; i < bch2_opts_nr; i++) {
-		const struct bch_option *opt = &bch2_opt_table[i];
-		u64 v = bch2_opt_get_by_id(&c->opts, i);
-
-		if (!(opt->flags & OPT_MOUNT))
-			continue;
-
-		if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
-			continue;
-
-		prt_str(&p, first ? " opts=" : ",");
-		first = false;
-		bch2_opt_to_text(&p, c, c->disk_sb.sb, opt, v, OPT_SHOW_MOUNT_STYLE);
-	}
-
-	bch_info(c, "%s", p.buf);
-	printbuf_exit(&p);
-}
-
-int bch2_fs_start(struct bch_fs *c)
-{
-	time64_t now = ktime_get_real_seconds();
-	int ret;
-
-	print_mount_opts(c);
-
-	down_write(&c->state_lock);
-
-	BUG_ON(test_bit(BCH_FS_started, &c->flags));
-
-	mutex_lock(&c->sb_lock);
-
-	ret = bch2_sb_members_v2_init(c);
-	if (ret) {
-		mutex_unlock(&c->sb_lock);
-		goto err;
-	}
-
-	for_each_online_member(c, ca)
-		bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount = cpu_to_le64(now);
-
-	mutex_unlock(&c->sb_lock);
-
-	for_each_rw_member(c, ca)
-		bch2_dev_allocator_add(c, ca);
-	bch2_recalc_capacity(c);
-
-	ret = BCH_SB_INITIALIZED(c->disk_sb.sb)
-		? bch2_fs_recovery(c)
-		: bch2_fs_initialize(c);
-	if (ret)
-		goto err;
-
-	ret = bch2_opts_check_may_set(c);
-	if (ret)
-		goto err;
-
-	if (bch2_fs_init_fault("fs_start")) {
-		bch_err(c, "fs_start fault injected");
-		ret = -EINVAL;
-		goto err;
-	}
-
-	set_bit(BCH_FS_started, &c->flags);
-
-	if (c->opts.read_only) {
-		bch2_fs_read_only(c);
-	} else {
-		ret = !test_bit(BCH_FS_rw, &c->flags)
-			? bch2_fs_read_write(c)
-			: bch2_fs_read_write_late(c);
-		if (ret)
-			goto err;
-	}
-
-	ret = 0;
-err:
-	if (ret)
-		bch_err_msg(c, ret, "starting filesystem");
-	else
-		bch_verbose(c, "done starting filesystem");
-	up_write(&c->state_lock);
-	return ret;
-}
-
-static int bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
-{
-	struct bch_member m = bch2_sb_member_get(sb, sb->dev_idx);
-
-	if (le16_to_cpu(sb->block_size) != block_sectors(c))
-		return -BCH_ERR_mismatched_block_size;
-
-	if (le16_to_cpu(m.bucket_size) <
-	    BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
-		return -BCH_ERR_bucket_size_too_small;
-
-	return 0;
-}
-
-static int bch2_dev_in_fs(struct bch_sb_handle *fs,
-			  struct bch_sb_handle *sb)
-{
-	if (fs == sb)
-		return 0;
-
-	if (!uuid_equal(&fs->sb->uuid, &sb->sb->uuid))
-		return -BCH_ERR_device_not_a_member_of_filesystem;
-
-	if (!bch2_dev_exists(fs->sb, sb->sb->dev_idx))
-		return -BCH_ERR_device_has_been_removed;
-
-	if (fs->sb->block_size != sb->sb->block_size)
-		return -BCH_ERR_mismatched_block_size;
-
-	if (le16_to_cpu(fs->sb->version) < bcachefs_metadata_version_member_seq ||
-	    le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_member_seq)
-		return 0;
-
-	if (fs->sb->seq == sb->sb->seq &&
-	    fs->sb->write_time != sb->sb->write_time) {
-		struct printbuf buf = PRINTBUF;
-
-		prt_str(&buf, "Split brain detected between ");
-		prt_bdevname(&buf, sb->bdev);
-		prt_str(&buf, " and ");
-		prt_bdevname(&buf, fs->bdev);
-		prt_char(&buf, ':');
-		prt_newline(&buf);
-		prt_printf(&buf, "seq=%llu but write_time different, got", le64_to_cpu(sb->sb->seq));
-		prt_newline(&buf);
-
-		prt_bdevname(&buf, fs->bdev);
-		prt_char(&buf, ' ');
-		bch2_prt_datetime(&buf, le64_to_cpu(fs->sb->write_time));;
-		prt_newline(&buf);
-
-		prt_bdevname(&buf, sb->bdev);
-		prt_char(&buf, ' ');
-		bch2_prt_datetime(&buf, le64_to_cpu(sb->sb->write_time));;
-		prt_newline(&buf);
-
-		prt_printf(&buf, "Not using older sb");
-
-		pr_err("%s", buf.buf);
-		printbuf_exit(&buf);
-		return -BCH_ERR_device_splitbrain;
-	}
-
-	struct bch_member m = bch2_sb_member_get(fs->sb, sb->sb->dev_idx);
-	u64 seq_from_fs		= le64_to_cpu(m.seq);
-	u64 seq_from_member	= le64_to_cpu(sb->sb->seq);
-
-	if (seq_from_fs && seq_from_fs < seq_from_member) {
-		struct printbuf buf = PRINTBUF;
-
-		prt_str(&buf, "Split brain detected between ");
-		prt_bdevname(&buf, sb->bdev);
-		prt_str(&buf, " and ");
-		prt_bdevname(&buf, fs->bdev);
-		prt_char(&buf, ':');
-		prt_newline(&buf);
-
-		prt_bdevname(&buf, fs->bdev);
-		prt_str(&buf, "believes seq of ");
-		prt_bdevname(&buf, sb->bdev);
-		prt_printf(&buf, " to be %llu, but ", seq_from_fs);
-		prt_bdevname(&buf, sb->bdev);
-		prt_printf(&buf, " has %llu\n", seq_from_member);
-		prt_str(&buf, "Not using ");
-		prt_bdevname(&buf, sb->bdev);
-
-		pr_err("%s", buf.buf);
-		printbuf_exit(&buf);
-		return -BCH_ERR_device_splitbrain;
-	}
-
-	return 0;
-}
-
-/* Device startup/shutdown: */
-
-static void bch2_dev_release(struct kobject *kobj)
-{
-	struct bch_dev *ca = container_of(kobj, struct bch_dev, kobj);
-
-	kfree(ca);
-}
-
-static void bch2_dev_free(struct bch_dev *ca)
-{
-	cancel_work_sync(&ca->io_error_work);
-
-	if (ca->kobj.state_in_sysfs &&
-	    ca->disk_sb.bdev)
-		sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
-
-	if (ca->kobj.state_in_sysfs)
-		kobject_del(&ca->kobj);
-
-	bch2_free_super(&ca->disk_sb);
-	bch2_dev_journal_exit(ca);
-
-	free_percpu(ca->io_done);
-	bioset_exit(&ca->replica_set);
-	bch2_dev_buckets_free(ca);
-	free_page((unsigned long) ca->sb_read_scratch);
-
-	bch2_time_stats_exit(&ca->io_latency[WRITE]);
-	bch2_time_stats_exit(&ca->io_latency[READ]);
-
-	percpu_ref_exit(&ca->io_ref);
-	percpu_ref_exit(&ca->ref);
-	kobject_put(&ca->kobj);
-}
-
-static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
-{
-
-	lockdep_assert_held(&c->state_lock);
-
-	if (percpu_ref_is_zero(&ca->io_ref))
-		return;
-
-	__bch2_dev_read_only(c, ca);
-
-	reinit_completion(&ca->io_ref_completion);
-	percpu_ref_kill(&ca->io_ref);
-	wait_for_completion(&ca->io_ref_completion);
-
-	if (ca->kobj.state_in_sysfs) {
-		sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
-		sysfs_remove_link(&ca->kobj, "block");
-	}
-
-	bch2_free_super(&ca->disk_sb);
-	bch2_dev_journal_exit(ca);
-}
-
-static void bch2_dev_ref_complete(struct percpu_ref *ref)
-{
-	struct bch_dev *ca = container_of(ref, struct bch_dev, ref);
-
-	complete(&ca->ref_completion);
-}
-
-static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
-{
-	struct bch_dev *ca = container_of(ref, struct bch_dev, io_ref);
-
-	complete(&ca->io_ref_completion);
-}
-
-static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
-{
-	int ret;
-
-	if (!c->kobj.state_in_sysfs)
-		return 0;
-
-	if (!ca->kobj.state_in_sysfs) {
-		ret = kobject_add(&ca->kobj, &c->kobj,
-				  "dev-%u", ca->dev_idx);
-		if (ret)
-			return ret;
-	}
-
-	if (ca->disk_sb.bdev) {
-		struct kobject *block = bdev_kobj(ca->disk_sb.bdev);
-
-		ret = sysfs_create_link(block, &ca->kobj, "bcachefs");
-		if (ret)
-			return ret;
-
-		ret = sysfs_create_link(&ca->kobj, block, "block");
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static struct bch_dev *__bch2_dev_alloc(struct bch_fs *c,
-					struct bch_member *member)
-{
-	struct bch_dev *ca;
-	unsigned i;
-
-	ca = kzalloc(sizeof(*ca), GFP_KERNEL);
-	if (!ca)
-		return NULL;
-
-	kobject_init(&ca->kobj, &bch2_dev_ktype);
-	init_completion(&ca->ref_completion);
-	init_completion(&ca->io_ref_completion);
-
-	init_rwsem(&ca->bucket_lock);
-
-	INIT_WORK(&ca->io_error_work, bch2_io_error_work);
-
-	bch2_time_stats_init(&ca->io_latency[READ]);
-	bch2_time_stats_init(&ca->io_latency[WRITE]);
-
-	ca->mi = bch2_mi_to_cpu(member);
-
-	for (i = 0; i < ARRAY_SIZE(member->errors); i++)
-		atomic64_set(&ca->errors[i], le64_to_cpu(member->errors[i]));
-
-	ca->uuid = member->uuid;
-
-	ca->nr_btree_reserve = DIV_ROUND_UP(BTREE_NODE_RESERVE,
-			     ca->mi.bucket_size / btree_sectors(c));
-
-	if (percpu_ref_init(&ca->ref, bch2_dev_ref_complete,
-			    0, GFP_KERNEL) ||
-	    percpu_ref_init(&ca->io_ref, bch2_dev_io_ref_complete,
-			    PERCPU_REF_INIT_DEAD, GFP_KERNEL) ||
-	    !(ca->sb_read_scratch = (void *) __get_free_page(GFP_KERNEL)) ||
-	    bch2_dev_buckets_alloc(c, ca) ||
-	    bioset_init(&ca->replica_set, 4,
-			offsetof(struct bch_write_bio, bio), 0) ||
-	    !(ca->io_done	= alloc_percpu(*ca->io_done)))
-		goto err;
-
-	return ca;
-err:
-	bch2_dev_free(ca);
-	return NULL;
-}
-
-static void bch2_dev_attach(struct bch_fs *c, struct bch_dev *ca,
-			    unsigned dev_idx)
-{
-	ca->dev_idx = dev_idx;
-	__set_bit(ca->dev_idx, ca->self.d);
-	scnprintf(ca->name, sizeof(ca->name), "dev-%u", dev_idx);
-
-	ca->fs = c;
-	rcu_assign_pointer(c->devs[ca->dev_idx], ca);
-
-	if (bch2_dev_sysfs_online(c, ca))
-		pr_warn("error creating sysfs objects");
-}
-
-static int bch2_dev_alloc(struct bch_fs *c, unsigned dev_idx)
-{
-	struct bch_member member = bch2_sb_member_get(c->disk_sb.sb, dev_idx);
-	struct bch_dev *ca = NULL;
-	int ret = 0;
-
-	if (bch2_fs_init_fault("dev_alloc"))
-		goto err;
-
-	ca = __bch2_dev_alloc(c, &member);
-	if (!ca)
-		goto err;
-
-	ca->fs = c;
-
-	bch2_dev_attach(c, ca, dev_idx);
-	return ret;
-err:
-	if (ca)
-		bch2_dev_free(ca);
-	return -BCH_ERR_ENOMEM_dev_alloc;
-}
-
-static int __bch2_dev_attach_bdev(struct bch_dev *ca, struct bch_sb_handle *sb)
-{
-	unsigned ret;
-
-	if (bch2_dev_is_online(ca)) {
-		bch_err(ca, "already have device online in slot %u",
-			sb->sb->dev_idx);
-		return -BCH_ERR_device_already_online;
-	}
-
-	if (get_capacity(sb->bdev->bd_disk) <
-	    ca->mi.bucket_size * ca->mi.nbuckets) {
-		bch_err(ca, "cannot online: device too small");
-		return -BCH_ERR_device_size_too_small;
-	}
-
-	BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
-
-	ret = bch2_dev_journal_init(ca, sb->sb);
-	if (ret)
-		return ret;
-
-	/* Commit: */
-	ca->disk_sb = *sb;
-	memset(sb, 0, sizeof(*sb));
-
-	ca->dev = ca->disk_sb.bdev->bd_dev;
-
-	percpu_ref_reinit(&ca->io_ref);
-
-	return 0;
-}
-
-static int bch2_dev_attach_bdev(struct bch_fs *c, struct bch_sb_handle *sb)
-{
-	struct bch_dev *ca;
-	int ret;
-
-	lockdep_assert_held(&c->state_lock);
-
-	if (le64_to_cpu(sb->sb->seq) >
-	    le64_to_cpu(c->disk_sb.sb->seq))
-		bch2_sb_to_fs(c, sb->sb);
-
-	BUG_ON(sb->sb->dev_idx >= c->sb.nr_devices ||
-	       !c->devs[sb->sb->dev_idx]);
-
-	ca = bch_dev_locked(c, sb->sb->dev_idx);
-
-	ret = __bch2_dev_attach_bdev(ca, sb);
-	if (ret)
-		return ret;
-
-	bch2_dev_sysfs_online(c, ca);
-
-	struct printbuf name = PRINTBUF;
-	prt_bdevname(&name, ca->disk_sb.bdev);
-
-	if (c->sb.nr_devices == 1)
-		strlcpy(c->name, name.buf, sizeof(c->name));
-	strlcpy(ca->name, name.buf, sizeof(ca->name));
-
-	printbuf_exit(&name);
-
-	rebalance_wakeup(c);
-	return 0;
-}
-
-/* Device management: */
-
-/*
- * Note: this function is also used by the error paths - when a particular
- * device sees an error, we call it to determine whether we can just set the
- * device RO, or - if this function returns false - we'll set the whole
- * filesystem RO:
- *
- * XXX: maybe we should be more explicit about whether we're changing state
- * because we got an error or what have you?
- */
-bool bch2_dev_state_allowed(struct bch_fs *c, struct bch_dev *ca,
-			    enum bch_member_state new_state, int flags)
-{
-	struct bch_devs_mask new_online_devs;
-	int nr_rw = 0, required;
-
-	lockdep_assert_held(&c->state_lock);
-
-	switch (new_state) {
-	case BCH_MEMBER_STATE_rw:
-		return true;
-	case BCH_MEMBER_STATE_ro:
-		if (ca->mi.state != BCH_MEMBER_STATE_rw)
-			return true;
-
-		/* do we have enough devices to write to?  */
-		for_each_member_device(c, ca2)
-			if (ca2 != ca)
-				nr_rw += ca2->mi.state == BCH_MEMBER_STATE_rw;
-
-		required = max(!(flags & BCH_FORCE_IF_METADATA_DEGRADED)
-			       ? c->opts.metadata_replicas
-			       : c->opts.metadata_replicas_required,
-			       !(flags & BCH_FORCE_IF_DATA_DEGRADED)
-			       ? c->opts.data_replicas
-			       : c->opts.data_replicas_required);
-
-		return nr_rw >= required;
-	case BCH_MEMBER_STATE_failed:
-	case BCH_MEMBER_STATE_spare:
-		if (ca->mi.state != BCH_MEMBER_STATE_rw &&
-		    ca->mi.state != BCH_MEMBER_STATE_ro)
-			return true;
-
-		/* do we have enough devices to read from?  */
-		new_online_devs = bch2_online_devs(c);
-		__clear_bit(ca->dev_idx, new_online_devs.d);
-
-		return bch2_have_enough_devs(c, new_online_devs, flags, false);
-	default:
-		BUG();
-	}
-}
-
-static bool bch2_fs_may_start(struct bch_fs *c)
-{
-	struct bch_dev *ca;
-	unsigned i, flags = 0;
-
-	if (c->opts.very_degraded)
-		flags |= BCH_FORCE_IF_DEGRADED|BCH_FORCE_IF_LOST;
-
-	if (c->opts.degraded)
-		flags |= BCH_FORCE_IF_DEGRADED;
-
-	if (!c->opts.degraded &&
-	    !c->opts.very_degraded) {
-		mutex_lock(&c->sb_lock);
-
-		for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
-			if (!bch2_dev_exists(c->disk_sb.sb, i))
-				continue;
-
-			ca = bch_dev_locked(c, i);
-
-			if (!bch2_dev_is_online(ca) &&
-			    (ca->mi.state == BCH_MEMBER_STATE_rw ||
-			     ca->mi.state == BCH_MEMBER_STATE_ro)) {
-				mutex_unlock(&c->sb_lock);
-				return false;
-			}
-		}
-		mutex_unlock(&c->sb_lock);
-	}
-
-	return bch2_have_enough_devs(c, bch2_online_devs(c), flags, true);
-}
-
-static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
-{
-	/*
-	 * The allocator thread itself allocates btree nodes, so stop it first:
-	 */
-	bch2_dev_allocator_remove(c, ca);
-	bch2_dev_journal_stop(&c->journal, ca);
-}
-
-static void __bch2_dev_read_write(struct bch_fs *c, struct bch_dev *ca)
-{
-	lockdep_assert_held(&c->state_lock);
-
-	BUG_ON(ca->mi.state != BCH_MEMBER_STATE_rw);
-
-	bch2_dev_allocator_add(c, ca);
-	bch2_recalc_capacity(c);
-}
-
-int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
-			 enum bch_member_state new_state, int flags)
-{
-	struct bch_member *m;
-	int ret = 0;
-
-	if (ca->mi.state == new_state)
-		return 0;
-
-	if (!bch2_dev_state_allowed(c, ca, new_state, flags))
-		return -BCH_ERR_device_state_not_allowed;
-
-	if (new_state != BCH_MEMBER_STATE_rw)
-		__bch2_dev_read_only(c, ca);
-
-	bch_notice(ca, "%s", bch2_member_states[new_state]);
-
-	mutex_lock(&c->sb_lock);
-	m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
-	SET_BCH_MEMBER_STATE(m, new_state);
-	bch2_write_super(c);
-	mutex_unlock(&c->sb_lock);
-
-	if (new_state == BCH_MEMBER_STATE_rw)
-		__bch2_dev_read_write(c, ca);
-
-	rebalance_wakeup(c);
-
-	return ret;
-}
-
-int bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
-		       enum bch_member_state new_state, int flags)
-{
-	int ret;
-
-	down_write(&c->state_lock);
-	ret = __bch2_dev_set_state(c, ca, new_state, flags);
-	up_write(&c->state_lock);
-
-	return ret;
-}
-
-/* Device add/removal: */
-
-static int bch2_dev_remove_alloc(struct bch_fs *c, struct bch_dev *ca)
-{
-	struct bpos start	= POS(ca->dev_idx, 0);
-	struct bpos end		= POS(ca->dev_idx, U64_MAX);
-	int ret;
-
-	/*
-	 * We clear the LRU and need_discard btrees first so that we don't race
-	 * with bch2_do_invalidates() and bch2_do_discards()
-	 */
-	ret =   bch2_btree_delete_range(c, BTREE_ID_lru, start, end,
-					BTREE_TRIGGER_NORUN, NULL) ?:
-		bch2_btree_delete_range(c, BTREE_ID_need_discard, start, end,
-					BTREE_TRIGGER_NORUN, NULL) ?:
-		bch2_btree_delete_range(c, BTREE_ID_freespace, start, end,
-					BTREE_TRIGGER_NORUN, NULL) ?:
-		bch2_btree_delete_range(c, BTREE_ID_backpointers, start, end,
-					BTREE_TRIGGER_NORUN, NULL) ?:
-		bch2_btree_delete_range(c, BTREE_ID_alloc, start, end,
-					BTREE_TRIGGER_NORUN, NULL) ?:
-		bch2_btree_delete_range(c, BTREE_ID_bucket_gens, start, end,
-					BTREE_TRIGGER_NORUN, NULL);
-	bch_err_msg(c, ret, "removing dev alloc info");
-	return ret;
-}
-
-int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
-{
-	struct bch_member *m;
-	unsigned dev_idx = ca->dev_idx, data;
-	int ret;
-
-	down_write(&c->state_lock);
-
-	/*
-	 * We consume a reference to ca->ref, regardless of whether we succeed
-	 * or fail:
-	 */
-	percpu_ref_put(&ca->ref);
-
-	if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
-		bch_err(ca, "Cannot remove without losing data");
-		ret = -BCH_ERR_device_state_not_allowed;
-		goto err;
-	}
-
-	__bch2_dev_read_only(c, ca);
-
-	ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
-	bch_err_msg(ca, ret, "dropping data");
-	if (ret)
-		goto err;
-
-	ret = bch2_dev_remove_alloc(c, ca);
-	bch_err_msg(ca, ret, "deleting alloc info");
-	if (ret)
-		goto err;
-
-	ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
-	bch_err_msg(ca, ret, "flushing journal");
-	if (ret)
-		goto err;
-
-	ret = bch2_journal_flush(&c->journal);
-	bch_err(ca, "journal error");
-	if (ret)
-		goto err;
-
-	ret = bch2_replicas_gc2(c);
-	bch_err_msg(ca, ret, "in replicas_gc2()");
-	if (ret)
-		goto err;
-
-	data = bch2_dev_has_data(c, ca);
-	if (data) {
-		struct printbuf data_has = PRINTBUF;
-
-		prt_bitflags(&data_has, bch2_data_types, data);
-		bch_err(ca, "Remove failed, still has data (%s)", data_has.buf);
-		printbuf_exit(&data_has);
-		ret = -EBUSY;
-		goto err;
-	}
-
-	__bch2_dev_offline(c, ca);
-
-	mutex_lock(&c->sb_lock);
-	rcu_assign_pointer(c->devs[ca->dev_idx], NULL);
-	mutex_unlock(&c->sb_lock);
-
-	percpu_ref_kill(&ca->ref);
-	wait_for_completion(&ca->ref_completion);
-
-	bch2_dev_free(ca);
-
-	/*
-	 * At this point the device object has been removed in-core, but the
-	 * on-disk journal might still refer to the device index via sb device
-	 * usage entries. Recovery fails if it sees usage information for an
-	 * invalid device. Flush journal pins to push the back of the journal
-	 * past now invalid device index references before we update the
-	 * superblock, but after the device object has been removed so any
-	 * further journal writes elide usage info for the device.
-	 */
-	bch2_journal_flush_all_pins(&c->journal);
-
-	/*
-	 * Free this device's slot in the bch_member array - all pointers to
-	 * this device must be gone:
-	 */
-	mutex_lock(&c->sb_lock);
-	m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
-	memset(&m->uuid, 0, sizeof(m->uuid));
-
-	bch2_write_super(c);
-
-	mutex_unlock(&c->sb_lock);
-	up_write(&c->state_lock);
-
-	bch2_dev_usage_journal_reserve(c);
-	return 0;
-err:
-	if (ca->mi.state == BCH_MEMBER_STATE_rw &&
-	    !percpu_ref_is_zero(&ca->io_ref))
-		__bch2_dev_read_write(c, ca);
-	up_write(&c->state_lock);
-	return ret;
-}
-
-/* Add new device to running filesystem: */
-int bch2_dev_add(struct bch_fs *c, const char *path)
-{
-	struct bch_opts opts = bch2_opts_empty();
-	struct bch_sb_handle sb;
-	struct bch_dev *ca = NULL;
-	struct bch_sb_field_members_v2 *mi;
-	struct bch_member dev_mi;
-	unsigned dev_idx, nr_devices, u64s;
-	struct printbuf errbuf = PRINTBUF;
-	struct printbuf label = PRINTBUF;
-	int ret;
-
-	ret = bch2_read_super(path, &opts, &sb);
-	bch_err_msg(c, ret, "reading super");
-	if (ret)
-		goto err;
-
-	dev_mi = bch2_sb_member_get(sb.sb, sb.sb->dev_idx);
-
-	if (BCH_MEMBER_GROUP(&dev_mi)) {
-		bch2_disk_path_to_text_sb(&label, sb.sb, BCH_MEMBER_GROUP(&dev_mi) - 1);
-		if (label.allocation_failure) {
-			ret = -ENOMEM;
-			goto err;
-		}
-	}
-
-	ret = bch2_dev_may_add(sb.sb, c);
-	if (ret)
-		goto err;
-
-	ca = __bch2_dev_alloc(c, &dev_mi);
-	if (!ca) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	bch2_dev_usage_init(ca);
-
-	ret = __bch2_dev_attach_bdev(ca, &sb);
-	if (ret)
-		goto err;
-
-	ret = bch2_dev_journal_alloc(ca);
-	bch_err_msg(c, ret, "allocating journal");
-	if (ret)
-		goto err;
-
-	down_write(&c->state_lock);
-	mutex_lock(&c->sb_lock);
-
-	ret = bch2_sb_from_fs(c, ca);
-	bch_err_msg(c, ret, "setting up new superblock");
-	if (ret)
-		goto err_unlock;
-
-	if (dynamic_fault("bcachefs:add:no_slot"))
-		goto no_slot;
-
-	for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
-		if (!bch2_dev_exists(c->disk_sb.sb, dev_idx))
-			goto have_slot;
-no_slot:
-	ret = -BCH_ERR_ENOSPC_sb_members;
-	bch_err_msg(c, ret, "setting up new superblock");
-	goto err_unlock;
-
-have_slot:
-	nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
-
-	mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
-	u64s = DIV_ROUND_UP(sizeof(struct bch_sb_field_members_v2) +
-			    le16_to_cpu(mi->member_bytes) * nr_devices, sizeof(u64));
-
-	mi = bch2_sb_field_resize(&c->disk_sb, members_v2, u64s);
-	if (!mi) {
-		ret = -BCH_ERR_ENOSPC_sb_members;
-		bch_err_msg(c, ret, "setting up new superblock");
-		goto err_unlock;
-	}
-	struct bch_member *m = bch2_members_v2_get_mut(c->disk_sb.sb, dev_idx);
-
-	/* success: */
-
-	*m = dev_mi;
-	m->last_mount = cpu_to_le64(ktime_get_real_seconds());
-	c->disk_sb.sb->nr_devices	= nr_devices;
-
-	ca->disk_sb.sb->dev_idx	= dev_idx;
-	bch2_dev_attach(c, ca, dev_idx);
-
-	if (BCH_MEMBER_GROUP(&dev_mi)) {
-		ret = __bch2_dev_group_set(c, ca, label.buf);
-		bch_err_msg(c, ret, "creating new label");
-		if (ret)
-			goto err_unlock;
-	}
-
-	bch2_write_super(c);
-	mutex_unlock(&c->sb_lock);
-
-	bch2_dev_usage_journal_reserve(c);
-
-	ret = bch2_trans_mark_dev_sb(c, ca);
-	bch_err_msg(ca, ret, "marking new superblock");
-	if (ret)
-		goto err_late;
-
-	ret = bch2_fs_freespace_init(c);
-	bch_err_msg(ca, ret, "initializing free space");
-	if (ret)
-		goto err_late;
-
-	ca->new_fs_bucket_idx = 0;
-
-	if (ca->mi.state == BCH_MEMBER_STATE_rw)
-		__bch2_dev_read_write(c, ca);
-
-	up_write(&c->state_lock);
-	return 0;
-
-err_unlock:
-	mutex_unlock(&c->sb_lock);
-	up_write(&c->state_lock);
-err:
-	if (ca)
-		bch2_dev_free(ca);
-	bch2_free_super(&sb);
-	printbuf_exit(&label);
-	printbuf_exit(&errbuf);
-	bch_err_fn(c, ret);
-	return ret;
-err_late:
-	up_write(&c->state_lock);
-	ca = NULL;
-	goto err;
-}
-
-/* Hot add existing device to running filesystem: */
-int bch2_dev_online(struct bch_fs *c, const char *path)
-{
-	struct bch_opts opts = bch2_opts_empty();
-	struct bch_sb_handle sb = { NULL };
-	struct bch_dev *ca;
-	unsigned dev_idx;
-	int ret;
-
-	down_write(&c->state_lock);
-
-	ret = bch2_read_super(path, &opts, &sb);
-	if (ret) {
-		up_write(&c->state_lock);
-		return ret;
-	}
-
-	dev_idx = sb.sb->dev_idx;
-
-	ret = bch2_dev_in_fs(&c->disk_sb, &sb);
-	bch_err_msg(c, ret, "bringing %s online", path);
-	if (ret)
-		goto err;
-
-	ret = bch2_dev_attach_bdev(c, &sb);
-	if (ret)
-		goto err;
-
-	ca = bch_dev_locked(c, dev_idx);
-
-	ret = bch2_trans_mark_dev_sb(c, ca);
-	bch_err_msg(c, ret, "bringing %s online: error from bch2_trans_mark_dev_sb", path);
-	if (ret)
-		goto err;
-
-	if (ca->mi.state == BCH_MEMBER_STATE_rw)
-		__bch2_dev_read_write(c, ca);
-
-	if (!ca->mi.freespace_initialized) {
-		ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);
-		bch_err_msg(ca, ret, "initializing free space");
-		if (ret)
-			goto err;
-	}
-
-	if (!ca->journal.nr) {
-		ret = bch2_dev_journal_alloc(ca);
-		bch_err_msg(ca, ret, "allocating journal");
-		if (ret)
-			goto err;
-	}
-
-	mutex_lock(&c->sb_lock);
-	bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx)->last_mount =
-		cpu_to_le64(ktime_get_real_seconds());
-	bch2_write_super(c);
-	mutex_unlock(&c->sb_lock);
-
-	up_write(&c->state_lock);
-	return 0;
-err:
-	up_write(&c->state_lock);
-	bch2_free_super(&sb);
-	return ret;
-}
-
-int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
-{
-	down_write(&c->state_lock);
-
-	if (!bch2_dev_is_online(ca)) {
-		bch_err(ca, "Already offline");
-		up_write(&c->state_lock);
-		return 0;
-	}
-
-	if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_failed, flags)) {
-		bch_err(ca, "Cannot offline required disk");
-		up_write(&c->state_lock);
-		return -BCH_ERR_device_state_not_allowed;
-	}
-
-	__bch2_dev_offline(c, ca);
-
-	up_write(&c->state_lock);
-	return 0;
-}
-
-int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
-{
-	struct bch_member *m;
-	u64 old_nbuckets;
-	int ret = 0;
-
-	down_write(&c->state_lock);
-	old_nbuckets = ca->mi.nbuckets;
-
-	if (nbuckets < ca->mi.nbuckets) {
-		bch_err(ca, "Cannot shrink yet");
-		ret = -EINVAL;
-		goto err;
-	}
-
-	if (bch2_dev_is_online(ca) &&
-	    get_capacity(ca->disk_sb.bdev->bd_disk) <
-	    ca->mi.bucket_size * nbuckets) {
-		bch_err(ca, "New size larger than device");
-		ret = -BCH_ERR_device_size_too_small;
-		goto err;
-	}
-
-	ret = bch2_dev_buckets_resize(c, ca, nbuckets);
-	bch_err_msg(ca, ret, "resizing buckets");
-	if (ret)
-		goto err;
-
-	ret = bch2_trans_mark_dev_sb(c, ca);
-	if (ret)
-		goto err;
-
-	mutex_lock(&c->sb_lock);
-	m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
-	m->nbuckets = cpu_to_le64(nbuckets);
-
-	bch2_write_super(c);
-	mutex_unlock(&c->sb_lock);
-
-	if (ca->mi.freespace_initialized) {
-		ret = bch2_dev_freespace_init(c, ca, old_nbuckets, nbuckets);
-		if (ret)
-			goto err;
-
-		/*
-		 * XXX: this is all wrong transactionally - we'll be able to do
-		 * this correctly after the disk space accounting rewrite
-		 */
-		ca->usage_base->d[BCH_DATA_free].buckets += nbuckets - old_nbuckets;
-	}
-
-	bch2_recalc_capacity(c);
-err:
-	up_write(&c->state_lock);
-	return ret;
-}
-
-/* return with ref on ca->ref: */
-struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *name)
-{
-	rcu_read_lock();
-	for_each_member_device_rcu(c, ca, NULL)
-		if (!strcmp(name, ca->name)) {
-			rcu_read_unlock();
-			return ca;
-		}
-	rcu_read_unlock();
-	return ERR_PTR(-BCH_ERR_ENOENT_dev_not_found);
-}
-
-/* Filesystem open: */
-
-static inline int sb_cmp(struct bch_sb *l, struct bch_sb *r)
-{
-	return  cmp_int(le64_to_cpu(l->seq), le64_to_cpu(r->seq)) ?:
-		cmp_int(le64_to_cpu(l->write_time), le64_to_cpu(r->write_time));
-}
-
-struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
-			    struct bch_opts opts)
-{
-	DARRAY(struct bch_sb_handle) sbs = { 0 };
-	struct bch_fs *c = NULL;
-	struct bch_sb_handle *best = NULL;
-	struct printbuf errbuf = PRINTBUF;
-	int ret = 0;
-
-	if (!try_module_get(THIS_MODULE))
-		return ERR_PTR(-ENODEV);
-
-	if (!nr_devices) {
-		ret = -EINVAL;
-		goto err;
-	}
-
-	ret = darray_make_room(&sbs, nr_devices);
-	if (ret)
-		goto err;
-
-	for (unsigned i = 0; i < nr_devices; i++) {
-		struct bch_sb_handle sb = { NULL };
-
-		ret = bch2_read_super(devices[i], &opts, &sb);
-		if (ret)
-			goto err;
-
-		BUG_ON(darray_push(&sbs, sb));
-	}
-
-	if (opts.nochanges && !opts.read_only) {
-		ret = -BCH_ERR_erofs_nochanges;
-		goto err_print;
-	}
-
-	darray_for_each(sbs, sb)
-		if (!best || sb_cmp(sb->sb, best->sb) > 0)
-			best = sb;
-
-	darray_for_each_reverse(sbs, sb) {
-		ret = bch2_dev_in_fs(best, sb);
-
-		if (ret == -BCH_ERR_device_has_been_removed ||
-		    ret == -BCH_ERR_device_splitbrain) {
-			bch2_free_super(sb);
-			darray_remove_item(&sbs, sb);
-			best -= best > sb;
-			ret = 0;
-			continue;
-		}
-
-		if (ret)
-			goto err_print;
-	}
-
-	c = bch2_fs_alloc(best->sb, opts);
-	ret = PTR_ERR_OR_ZERO(c);
-	if (ret)
-		goto err;
-
-	down_write(&c->state_lock);
-	darray_for_each(sbs, sb) {
-		ret = bch2_dev_attach_bdev(c, sb);
-		if (ret) {
-			up_write(&c->state_lock);
-			goto err;
-		}
-	}
-	up_write(&c->state_lock);
-
-	if (!bch2_fs_may_start(c)) {
-		ret = -BCH_ERR_insufficient_devices_to_start;
-		goto err_print;
-	}
-
-	if (!c->opts.nostart) {
-		ret = bch2_fs_start(c);
-		if (ret)
-			goto err;
-	}
-out:
-	darray_for_each(sbs, sb)
-		bch2_free_super(sb);
-	darray_exit(&sbs);
-	printbuf_exit(&errbuf);
-	module_put(THIS_MODULE);
-	return c;
-err_print:
-	pr_err("bch_fs_open err opening %s: %s",
-	       devices[0], bch2_err_str(ret));
-err:
-	if (!IS_ERR_OR_NULL(c))
-		bch2_fs_stop(c);
-	c = ERR_PTR(ret);
-	goto out;
-}
-
-/* Global interfaces/init */
-
-static void bcachefs_exit(void)
-{
-	bch2_debug_exit();
-	bch2_vfs_exit();
-	bch2_chardev_exit();
-	bch2_btree_key_cache_exit();
-	if (bcachefs_kset)
-		kset_unregister(bcachefs_kset);
-}
-
-static int __init bcachefs_init(void)
-{
-	bch2_bkey_pack_test();
-
-	if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
-	    bch2_btree_key_cache_init() ||
-	    bch2_chardev_init() ||
-	    bch2_vfs_init() ||
-	    bch2_debug_init())
-		goto err;
-
-	return 0;
-err:
-	bcachefs_exit();
-	return -ENOMEM;
-}
-
-#define BCH_DEBUG_PARAM(name, description)			\
-	bool bch2_##name;					\
-	module_param_named(name, bch2_##name, bool, 0644);	\
-	MODULE_PARM_DESC(name, description);
-BCH_DEBUG_PARAMS()
-#undef BCH_DEBUG_PARAM
-
-__maybe_unused
-static unsigned bch2_metadata_version = bcachefs_metadata_version_current;
-module_param_named(version, bch2_metadata_version, uint, 0400);
-
-module_exit(bcachefs_exit);
-module_init(bcachefs_init);