linux/fs/bcachefs/super.c
Kent Overstreet 73e6ab9564 bcachefs: Switch replicas to mark_lock
Prep work for upcoming disk accounting changes

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2023-10-22 17:08:13 -04:00

1810 lines
41 KiB
C

// 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_update_interior.h"
#include "btree_io.h"
#include "chardev.h"
#include "checksum.h"
#include "clock.h"
#include "compress.h"
#include "debug.h"
#include "disk_groups.h"
#include "ec.h"
#include "error.h"
#include "fs.h"
#include "fs-io.h"
#include "fsck.h"
#include "inode.h"
#include "io.h"
#include "journal.h"
#include "journal_reclaim.h"
#include "move.h"
#include "migrate.h"
#include "movinggc.h"
#include "quota.h"
#include "rebalance.h"
#include "recovery.h"
#include "replicas.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/kthread.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>");
#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_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_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);
static DECLARE_WAIT_QUEUE_HEAD(bch_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;
struct bch_dev *ca;
unsigned i;
mutex_lock(&bch_fs_list_lock);
rcu_read_lock();
list_for_each_entry(c, &bch_fs_list, list)
for_each_member_device_rcu(ca, c, i, NULL)
if (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;
}
/* 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)
{
struct bch_dev *ca;
unsigned i;
bch2_rebalance_stop(c);
for_each_member_device(ca, c, i)
bch2_copygc_stop(ca);
bch2_gc_thread_stop(c);
/*
* Flush journal before stopping allocators, because flushing journal
* blacklist entries involves allocating new btree nodes:
*/
bch2_journal_flush_all_pins(&c->journal);
for_each_member_device(ca, c, i)
bch2_dev_allocator_stop(ca);
bch2_journal_flush_all_pins(&c->journal);
/*
* We need to explicitly wait on btree interior updates to complete
* before stopping the journal, flushing all journal pins isn't
* sufficient, because in the BTREE_INTERIOR_UPDATING_ROOT case btree
* interior updates have to drop their journal pin before they're
* fully complete:
*/
closure_wait_event(&c->btree_interior_update_wait,
!bch2_btree_interior_updates_nr_pending(c));
bch2_fs_journal_stop(&c->journal);
/*
* the journal kicks off btree writes via reclaim - wait for in flight
* writes after stopping journal:
*/
if (test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
bch2_btree_flush_all_writes(c);
else
bch2_btree_verify_flushed(c);
/*
* After stopping journal:
*/
for_each_member_device(ca, c, i)
bch2_dev_allocator_remove(c, ca);
}
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(&bch_read_only_wait);
}
void bch2_fs_read_only(struct bch_fs *c)
{
if (c->state == BCH_FS_RO)
return;
BUG_ON(test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
/*
* Block new foreground-end write operations from starting - any new
* writes will return -EROFS:
*
* (This is really blocking new _allocations_, writes to previously
* allocated space can still happen until stopping the allocator in
* bch2_dev_allocator_stop()).
*/
percpu_ref_kill(&c->writes);
cancel_delayed_work(&c->pd_controllers_update);
/*
* 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(bch_read_only_wait,
test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags) ||
test_bit(BCH_FS_EMERGENCY_RO, &c->flags));
__bch2_fs_read_only(c);
wait_event(bch_read_only_wait,
test_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags));
clear_bit(BCH_FS_WRITE_DISABLE_COMPLETE, &c->flags);
if (!bch2_journal_error(&c->journal) &&
!test_bit(BCH_FS_ERROR, &c->flags) &&
!test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
bch2_fs_mark_clean(c, true);
if (c->state != BCH_FS_STOPPING)
c->state = BCH_FS_RO;
}
static void bch2_fs_read_only_work(struct work_struct *work)
{
struct bch_fs *c =
container_of(work, struct bch_fs, read_only_work);
mutex_lock(&c->state_lock);
bch2_fs_read_only(c);
mutex_unlock(&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_fs_read_only_async(c);
bch2_journal_halt(&c->journal);
wake_up(&bch_read_only_wait);
return ret;
}
const char *bch2_fs_read_write(struct bch_fs *c)
{
struct bch_dev *ca;
const char *err = NULL;
unsigned i;
if (c->state == BCH_FS_RW)
return NULL;
bch2_fs_mark_clean(c, false);
for_each_rw_member(ca, c, i)
bch2_dev_allocator_add(c, ca);
bch2_recalc_capacity(c);
err = "error starting allocator thread";
for_each_rw_member(ca, c, i)
if (bch2_dev_allocator_start(ca)) {
percpu_ref_put(&ca->io_ref);
goto err;
}
err = "error starting btree GC thread";
if (bch2_gc_thread_start(c))
goto err;
err = "error starting copygc thread";
for_each_rw_member(ca, c, i)
if (bch2_copygc_start(c, ca)) {
percpu_ref_put(&ca->io_ref);
goto err;
}
err = "error starting rebalance thread";
if (bch2_rebalance_start(c))
goto err;
schedule_delayed_work(&c->pd_controllers_update, 5 * HZ);
if (c->state != BCH_FS_STARTING)
percpu_ref_reinit(&c->writes);
c->state = BCH_FS_RW;
return NULL;
err:
__bch2_fs_read_only(c);
return err;
}
/* 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_fs_quota_exit(c);
bch2_fs_fsio_exit(c);
bch2_fs_ec_exit(c);
bch2_fs_encryption_exit(c);
bch2_fs_io_exit(c);
bch2_fs_btree_cache_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);
percpu_free_rwsem(&c->mark_lock);
free_percpu(c->usage[0]);
mempool_exit(&c->btree_iters_pool);
mempool_exit(&c->btree_bounce_pool);
bioset_exit(&c->btree_bio);
mempool_exit(&c->btree_interior_update_pool);
mempool_exit(&c->btree_reserve_pool);
mempool_exit(&c->fill_iter);
percpu_ref_exit(&c->writes);
kfree(c->replicas.entries);
kfree(c->replicas_gc.entries);
kfree(rcu_dereference_protected(c->disk_groups, 1));
if (c->copygc_wq)
destroy_workqueue(c->copygc_wq);
if (c->wq)
destroy_workqueue(c->wq);
free_pages((unsigned long) c->disk_sb.sb,
c->disk_sb.page_order);
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)
{
struct bch_dev *ca;
unsigned i;
bch_verbose(c, "shutting down");
for_each_member_device(ca, c, i)
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);
kobject_put(&c->time_stats);
kobject_put(&c->opts_dir);
kobject_put(&c->internal);
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);
mutex_lock(&c->state_lock);
bch2_fs_read_only(c);
mutex_unlock(&c->state_lock);
/* btree prefetch might have kicked off reads in the background: */
bch2_btree_flush_all_reads(c);
for_each_member_device(ca, c, i)
cancel_work_sync(&ca->io_error_work);
cancel_work_sync(&c->btree_write_error_work);
cancel_delayed_work_sync(&c->pd_controllers_update);
cancel_work_sync(&c->read_only_work);
for (i = 0; i < c->sb.nr_devices; i++)
if (c->devs[i])
bch2_dev_free(rcu_dereference_protected(c->devs[i], 1));
bch_verbose(c, "shutdown complete");
kobject_put(&c->kobj);
}
static const char *bch2_fs_online(struct bch_fs *c)
{
struct bch_dev *ca;
const char *err = NULL;
unsigned i;
int ret;
lockdep_assert_held(&bch_fs_list_lock);
if (!list_empty(&c->list))
return NULL;
if (__bch2_uuid_to_fs(c->sb.uuid))
return "filesystem UUID already open";
ret = bch2_fs_chardev_init(c);
if (ret)
return "error creating character device";
bch2_fs_debug_init(c);
if (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") ||
kobject_add(&c->time_stats, &c->kobj, "time_stats") ||
bch2_opts_create_sysfs_files(&c->opts_dir))
return "error creating sysfs objects";
mutex_lock(&c->state_lock);
err = "error creating sysfs objects";
__for_each_member_device(ca, c, i, NULL)
if (bch2_dev_sysfs_online(c, ca))
goto err;
list_add(&c->list, &bch_fs_list);
err = NULL;
err:
mutex_unlock(&c->state_lock);
return err;
}
static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
{
struct bch_sb_field_members *mi;
struct bch_fs *c;
unsigned i, iter_size;
const char *err;
pr_verbose_init(opts, "");
c = kvpmalloc(sizeof(struct bch_fs), GFP_KERNEL|__GFP_ZERO);
if (!c)
goto out;
__module_get(THIS_MODULE);
c->minor = -1;
c->disk_sb.fs_sb = true;
mutex_init(&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);
init_rwsem(&c->gc_lock);
for (i = 0; i < BCH_TIME_STAT_NR; i++)
bch2_time_stats_init(&c->times[i]);
bch2_fs_allocator_background_init(c);
bch2_fs_allocator_foreground_init(c);
bch2_fs_rebalance_init(c);
bch2_fs_quota_init(c);
INIT_LIST_HEAD(&c->list);
INIT_LIST_HEAD(&c->btree_interior_update_list);
mutex_init(&c->btree_reserve_cache_lock);
mutex_init(&c->btree_interior_update_lock);
mutex_init(&c->bio_bounce_pages_lock);
bio_list_init(&c->btree_write_error_list);
spin_lock_init(&c->btree_write_error_lock);
INIT_WORK(&c->btree_write_error_work, bch2_btree_write_error_work);
INIT_LIST_HEAD(&c->fsck_errors);
mutex_init(&c->fsck_error_lock);
INIT_LIST_HEAD(&c->ec_new_stripe_list);
mutex_init(&c->ec_new_stripe_lock);
mutex_init(&c->ec_stripe_create_lock);
spin_lock_init(&c->ec_stripes_heap_lock);
seqcount_init(&c->gc_pos_lock);
c->copy_gc_enabled = 1;
c->rebalance.enabled = 1;
c->promote_whole_extents = true;
c->journal.write_time = &c->times[BCH_TIME_journal_write];
c->journal.delay_time = &c->times[BCH_TIME_journal_delay];
c->journal.blocked_time = &c->times[BCH_TIME_journal_blocked];
c->journal.flush_seq_time = &c->times[BCH_TIME_journal_flush_seq];
bch2_fs_btree_cache_init_early(&c->btree_cache);
if (percpu_init_rwsem(&c->mark_lock))
goto err;
mutex_lock(&c->sb_lock);
if (bch2_sb_to_fs(c, sb)) {
mutex_unlock(&c->sb_lock);
goto err;
}
mutex_unlock(&c->sb_lock);
scnprintf(c->name, sizeof(c->name), "%pU", &c->sb.user_uuid);
c->opts = bch2_opts_default;
bch2_opts_apply(&c->opts, bch2_opts_from_sb(sb));
bch2_opts_apply(&c->opts, opts);
c->block_bits = ilog2(c->opts.block_size);
c->btree_foreground_merge_threshold = BTREE_FOREGROUND_MERGE_THRESHOLD(c);
c->opts.nochanges |= c->opts.noreplay;
c->opts.read_only |= c->opts.nochanges;
if (bch2_fs_init_fault("fs_alloc"))
goto err;
iter_size = sizeof(struct btree_node_iter_large) +
(btree_blocks(c) + 1) * 2 *
sizeof(struct btree_node_iter_set);
if (!(c->wq = alloc_workqueue("bcachefs",
WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) ||
!(c->copygc_wq = alloc_workqueue("bcache_copygc",
WQ_FREEZABLE|WQ_MEM_RECLAIM|WQ_HIGHPRI, 1)) ||
percpu_ref_init(&c->writes, bch2_writes_disabled, 0, GFP_KERNEL) ||
mempool_init_kmalloc_pool(&c->btree_reserve_pool, 1,
sizeof(struct btree_reserve)) ||
mempool_init_kmalloc_pool(&c->btree_interior_update_pool, 1,
sizeof(struct btree_update)) ||
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->usage[0] = alloc_percpu(struct bch_fs_usage)) ||
mempool_init_kvpmalloc_pool(&c->btree_bounce_pool, 1,
btree_bytes(c)) ||
mempool_init_kmalloc_pool(&c->btree_iters_pool, 1,
sizeof(struct btree_iter) * BTREE_ITER_MAX) ||
bch2_io_clock_init(&c->io_clock[READ]) ||
bch2_io_clock_init(&c->io_clock[WRITE]) ||
bch2_fs_journal_init(&c->journal) ||
bch2_fs_btree_cache_init(c) ||
bch2_fs_io_init(c) ||
bch2_fs_encryption_init(c) ||
bch2_fs_compress_init(c) ||
bch2_fs_ec_init(c) ||
bch2_fs_fsio_init(c))
goto err;
mi = bch2_sb_get_members(c->disk_sb.sb);
for (i = 0; i < c->sb.nr_devices; i++)
if (bch2_dev_exists(c->disk_sb.sb, mi, i) &&
bch2_dev_alloc(c, i))
goto err;
/*
* Now that all allocations have succeeded, init various refcounty
* things that let us shutdown:
*/
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);
mutex_lock(&bch_fs_list_lock);
err = bch2_fs_online(c);
mutex_unlock(&bch_fs_list_lock);
if (err) {
bch_err(c, "bch2_fs_online() error: %s", err);
goto err;
}
out:
pr_verbose_init(opts, "ret %i", c ? 0 : -ENOMEM);
return c;
err:
bch2_fs_free(c);
c = NULL;
goto out;
}
const char *bch2_fs_start(struct bch_fs *c)
{
const char *err = "cannot allocate memory";
struct bch_sb_field_members *mi;
struct bch_dev *ca;
time64_t now = ktime_get_real_seconds();
unsigned i;
int ret = -EINVAL;
mutex_lock(&c->state_lock);
BUG_ON(c->state != BCH_FS_STARTING);
mutex_lock(&c->sb_lock);
for_each_online_member(ca, c, i)
bch2_sb_from_fs(c, ca);
mi = bch2_sb_get_members(c->disk_sb.sb);
for_each_online_member(ca, c, i)
mi->members[ca->dev_idx].last_mount = cpu_to_le64(now);
mutex_unlock(&c->sb_lock);
for_each_rw_member(ca, c, i)
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;
err = "dynamic fault";
if (bch2_fs_init_fault("fs_start"))
goto err;
if (c->opts.read_only) {
bch2_fs_read_only(c);
} else {
err = bch2_fs_read_write(c);
if (err)
goto err;
}
set_bit(BCH_FS_STARTED, &c->flags);
err = NULL;
out:
mutex_unlock(&c->state_lock);
return err;
err:
switch (ret) {
case BCH_FSCK_ERRORS_NOT_FIXED:
bch_err(c, "filesystem contains errors: please report this to the developers");
pr_cont("mount with -o fix_errors to repair\n");
err = "fsck error";
break;
case BCH_FSCK_REPAIR_UNIMPLEMENTED:
bch_err(c, "filesystem contains errors: please report this to the developers");
pr_cont("repair unimplemented: inform the developers so that it can be added\n");
err = "fsck error";
break;
case BCH_FSCK_REPAIR_IMPOSSIBLE:
bch_err(c, "filesystem contains errors, but repair impossible");
err = "fsck error";
break;
case BCH_FSCK_UNKNOWN_VERSION:
err = "unknown metadata version";;
break;
case -ENOMEM:
err = "cannot allocate memory";
break;
case -EIO:
err = "IO error";
break;
}
BUG_ON(!err);
set_bit(BCH_FS_ERROR, &c->flags);
goto out;
}
static const char *bch2_dev_may_add(struct bch_sb *sb, struct bch_fs *c)
{
struct bch_sb_field_members *sb_mi;
sb_mi = bch2_sb_get_members(sb);
if (!sb_mi)
return "Invalid superblock: member info area missing";
if (le16_to_cpu(sb->block_size) != c->opts.block_size)
return "mismatched block size";
if (le16_to_cpu(sb_mi->members[sb->dev_idx].bucket_size) <
BCH_SB_BTREE_NODE_SIZE(c->disk_sb.sb))
return "new cache bucket size is too small";
return NULL;
}
static const char *bch2_dev_in_fs(struct bch_sb *fs, struct bch_sb *sb)
{
struct bch_sb *newest =
le64_to_cpu(fs->seq) > le64_to_cpu(sb->seq) ? fs : sb;
struct bch_sb_field_members *mi = bch2_sb_get_members(newest);
if (!uuid_equal(&fs->uuid, &sb->uuid))
return "device not a member of filesystem";
if (!bch2_dev_exists(newest, mi, sb->dev_idx))
return "device has been removed";
if (fs->block_size != sb->block_size)
return "mismatched block size";
return NULL;
}
/* 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);
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;
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);
writepoint_init(&ca->copygc_write_point, BCH_DATA_USER);
spin_lock_init(&ca->freelist_lock);
bch2_dev_copygc_init(ca);
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);
ca->uuid = member->uuid;
if (opt_defined(c->opts, discard))
ca->mi.discard = opt_get(c->opts, discard);
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) ||
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_get_members(c->disk_sb.sb)->members + dev_idx;
struct bch_dev *ca = NULL;
int ret = 0;
pr_verbose_init(c->opts, "");
if (bch2_fs_init_fault("dev_alloc"))
goto err;
ca = __bch2_dev_alloc(c, member);
if (!ca)
goto err;
bch2_dev_attach(c, ca, dev_idx);
out:
pr_verbose_init(c->opts, "ret %i", ret);
return ret;
err:
if (ca)
bch2_dev_free(ca);
ret = -ENOMEM;
goto out;
}
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 -EINVAL;
}
if (get_capacity(sb->bdev->bd_disk) <
ca->mi.bucket_size * ca->mi.nbuckets) {
bch_err(ca, "cannot online: device too small");
return -EINVAL;
}
BUG_ON(!percpu_ref_is_zero(&ca->io_ref));
if (get_capacity(sb->bdev->bd_disk) <
ca->mi.bucket_size * ca->mi.nbuckets) {
bch_err(ca, "device too small");
return -EINVAL;
}
ret = bch2_dev_journal_init(ca, sb->sb);
if (ret)
return ret;
/* Commit: */
ca->disk_sb = *sb;
memset(sb, 0, sizeof(*sb));
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;
mutex_lock(&c->sb_lock);
bch2_mark_dev_superblock(ca->fs, ca, 0);
mutex_unlock(&c->sb_lock);
bch2_dev_sysfs_online(c, ca);
if (c->sb.nr_devices == 1)
snprintf(c->name, sizeof(c->name), "%pg", ca->disk_sb.bdev);
snprintf(ca->name, sizeof(ca->name), "%pg", ca->disk_sb.bdev);
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;
struct replicas_status s;
struct bch_dev *ca2;
int i, 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(ca2, c, i)
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);
s = __bch2_replicas_status(c, new_online_devs);
return bch2_have_enough_devs(s, flags);
default:
BUG();
}
}
static bool bch2_fs_may_start(struct bch_fs *c)
{
struct replicas_status s;
struct bch_sb_field_members *mi;
struct bch_dev *ca;
unsigned i, flags = c->opts.degraded
? BCH_FORCE_IF_DEGRADED
: 0;
if (!c->opts.degraded) {
mutex_lock(&c->sb_lock);
mi = bch2_sb_get_members(c->disk_sb.sb);
for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
if (!bch2_dev_exists(c->disk_sb.sb, mi, 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);
}
s = bch2_replicas_status(c);
return bch2_have_enough_devs(s, flags);
}
static void __bch2_dev_read_only(struct bch_fs *c, struct bch_dev *ca)
{
bch2_copygc_stop(ca);
/*
* The allocator thread itself allocates btree nodes, so stop it first:
*/
bch2_dev_allocator_stop(ca);
bch2_dev_allocator_remove(c, ca);
bch2_dev_journal_stop(&c->journal, ca);
}
static const char *__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);
if (bch2_dev_allocator_start(ca))
return "error starting allocator thread";
if (bch2_copygc_start(c, ca))
return "error starting copygc thread";
return NULL;
}
int __bch2_dev_set_state(struct bch_fs *c, struct bch_dev *ca,
enum bch_member_state new_state, int flags)
{
struct bch_sb_field_members *mi;
int ret = 0;
if (ca->mi.state == new_state)
return 0;
if (!bch2_dev_state_allowed(c, ca, new_state, flags))
return -EINVAL;
if (new_state != BCH_MEMBER_STATE_RW)
__bch2_dev_read_only(c, ca);
bch_notice(ca, "%s", bch2_dev_state[new_state]);
mutex_lock(&c->sb_lock);
mi = bch2_sb_get_members(c->disk_sb.sb);
SET_BCH_MEMBER_STATE(&mi->members[ca->dev_idx], new_state);
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
if (new_state == BCH_MEMBER_STATE_RW &&
__bch2_dev_read_write(c, ca))
ret = -ENOMEM;
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;
mutex_lock(&c->state_lock);
ret = __bch2_dev_set_state(c, ca, new_state, flags);
mutex_unlock(&c->state_lock);
return ret;
}
/* Device add/removal: */
int bch2_dev_remove(struct bch_fs *c, struct bch_dev *ca, int flags)
{
struct bch_sb_field_members *mi;
unsigned dev_idx = ca->dev_idx, data;
int ret = -EINVAL;
mutex_lock(&c->state_lock);
percpu_ref_put(&ca->ref); /* XXX */
if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) {
bch_err(ca, "Cannot remove without losing data");
goto err;
}
__bch2_dev_read_only(c, ca);
/*
* XXX: verify that dev_idx is really not in use anymore, anywhere
*
* flag_data_bad() does not check btree pointers
*/
ret = bch2_dev_data_drop(c, ca->dev_idx, flags);
if (ret) {
bch_err(ca, "Remove failed: error %i dropping data", ret);
goto err;
}
ret = bch2_journal_flush_device_pins(&c->journal, ca->dev_idx);
if (ret) {
bch_err(ca, "Remove failed: error %i flushing journal", ret);
goto err;
}
data = bch2_dev_has_data(c, ca);
if (data) {
char data_has_str[100];
bch2_string_opt_to_text(&PBUF(data_has_str),
bch2_data_types, data);
bch_err(ca, "Remove failed, still has data (%s)", data_has_str);
ret = -EBUSY;
goto err;
}
ret = bch2_btree_delete_range(c, BTREE_ID_ALLOC,
POS(ca->dev_idx, 0),
POS(ca->dev_idx + 1, 0),
NULL);
if (ret) {
bch_err(ca, "Remove failed, error deleting alloc info");
goto err;
}
/*
* must flush all existing journal entries, they might have
* (overwritten) keys that point to the device we're removing:
*/
bch2_journal_flush_all_pins(&c->journal);
ret = bch2_journal_error(&c->journal);
if (ret) {
bch_err(ca, "Remove failed, journal error");
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);
/*
* Free this device's slot in the bch_member array - all pointers to
* this device must be gone:
*/
mutex_lock(&c->sb_lock);
mi = bch2_sb_get_members(c->disk_sb.sb);
memset(&mi->members[dev_idx].uuid, 0, sizeof(mi->members[dev_idx].uuid));
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
mutex_unlock(&c->state_lock);
return 0;
err:
if (ca->mi.state == BCH_MEMBER_STATE_RW)
__bch2_dev_read_write(c, ca);
mutex_unlock(&c->state_lock);
return ret;
}
static void dev_usage_clear(struct bch_dev *ca)
{
struct bucket_array *buckets;
int cpu;
for_each_possible_cpu(cpu) {
struct bch_dev_usage *p =
per_cpu_ptr(ca->usage[0], cpu);
memset(p, 0, sizeof(*p));
}
down_read(&ca->bucket_lock);
buckets = bucket_array(ca);
memset(buckets->b, 0, sizeof(buckets->b[0]) * buckets->nbuckets);
up_read(&ca->bucket_lock);
}
/* 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;
const char *err;
struct bch_dev *ca = NULL;
struct bch_sb_field_members *mi;
struct bch_member dev_mi;
unsigned dev_idx, nr_devices, u64s;
int ret;
ret = bch2_read_super(path, &opts, &sb);
if (ret)
return ret;
err = bch2_sb_validate(&sb);
if (err)
return -EINVAL;
dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx];
err = bch2_dev_may_add(sb.sb, c);
if (err)
return -EINVAL;
ca = __bch2_dev_alloc(c, &dev_mi);
if (!ca) {
bch2_free_super(&sb);
return -ENOMEM;
}
ret = __bch2_dev_attach_bdev(ca, &sb);
if (ret) {
bch2_dev_free(ca);
return ret;
}
/*
* We want to allocate journal on the new device before adding the new
* device to the filesystem because allocating after we attach requires
* spinning up the allocator thread, and the allocator thread requires
* doing btree writes, which if the existing devices are RO isn't going
* to work
*
* So we have to mark where the superblocks are, but marking allocated
* data normally updates the filesystem usage too, so we have to mark,
* allocate the journal, reset all the marks, then remark after we
* attach...
*/
bch2_mark_dev_superblock(ca->fs, ca, 0);
err = "journal alloc failed";
ret = bch2_dev_journal_alloc(ca);
if (ret)
goto err;
dev_usage_clear(ca);
mutex_lock(&c->state_lock);
mutex_lock(&c->sb_lock);
err = "insufficient space in new superblock";
ret = bch2_sb_from_fs(c, ca);
if (ret)
goto err_unlock;
mi = bch2_sb_get_members(ca->disk_sb.sb);
if (!bch2_sb_resize_members(&ca->disk_sb,
le32_to_cpu(mi->field.u64s) +
sizeof(dev_mi) / sizeof(u64))) {
ret = -ENOSPC;
goto err_unlock;
}
if (dynamic_fault("bcachefs:add:no_slot"))
goto no_slot;
mi = bch2_sb_get_members(c->disk_sb.sb);
for (dev_idx = 0; dev_idx < BCH_SB_MEMBERS_MAX; dev_idx++)
if (!bch2_dev_exists(c->disk_sb.sb, mi, dev_idx))
goto have_slot;
no_slot:
err = "no slots available in superblock";
ret = -ENOSPC;
goto err_unlock;
have_slot:
nr_devices = max_t(unsigned, dev_idx + 1, c->sb.nr_devices);
u64s = (sizeof(struct bch_sb_field_members) +
sizeof(struct bch_member) * nr_devices) / sizeof(u64);
err = "no space in superblock for member info";
ret = -ENOSPC;
mi = bch2_sb_resize_members(&c->disk_sb, u64s);
if (!mi)
goto err_unlock;
/* success: */
mi->members[dev_idx] = dev_mi;
mi->members[dev_idx].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);
bch2_mark_dev_superblock(c, ca, 0);
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
if (ca->mi.state == BCH_MEMBER_STATE_RW) {
err = __bch2_dev_read_write(c, ca);
if (err)
goto err_late;
}
mutex_unlock(&c->state_lock);
return 0;
err_unlock:
mutex_unlock(&c->sb_lock);
mutex_unlock(&c->state_lock);
err:
if (ca)
bch2_dev_free(ca);
bch2_free_super(&sb);
bch_err(c, "Unable to add device: %s", err);
return ret;
err_late:
bch_err(c, "Error going rw after adding device: %s", err);
return -EINVAL;
}
/* 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_sb_field_members *mi;
struct bch_dev *ca;
unsigned dev_idx;
const char *err;
int ret;
mutex_lock(&c->state_lock);
ret = bch2_read_super(path, &opts, &sb);
if (ret) {
mutex_unlock(&c->state_lock);
return ret;
}
dev_idx = sb.sb->dev_idx;
err = bch2_dev_in_fs(c->disk_sb.sb, sb.sb);
if (err)
goto err;
if (bch2_dev_attach_bdev(c, &sb)) {
err = "bch2_dev_attach_bdev() error";
goto err;
}
ca = bch_dev_locked(c, dev_idx);
if (ca->mi.state == BCH_MEMBER_STATE_RW) {
err = __bch2_dev_read_write(c, ca);
if (err)
goto err;
}
mutex_lock(&c->sb_lock);
mi = bch2_sb_get_members(c->disk_sb.sb);
mi->members[ca->dev_idx].last_mount =
cpu_to_le64(ktime_get_real_seconds());
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
mutex_unlock(&c->state_lock);
return 0;
err:
mutex_unlock(&c->state_lock);
bch2_free_super(&sb);
bch_err(c, "error bringing %s online: %s", path, err);
return -EINVAL;
}
int bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca, int flags)
{
mutex_lock(&c->state_lock);
if (!bch2_dev_is_online(ca)) {
bch_err(ca, "Already offline");
mutex_unlock(&c->state_lock);
return 0;
}
if (!bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_FAILED, flags)) {
bch_err(ca, "Cannot offline required disk");
mutex_unlock(&c->state_lock);
return -EINVAL;
}
__bch2_dev_offline(c, ca);
mutex_unlock(&c->state_lock);
return 0;
}
int bch2_dev_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
{
struct bch_member *mi;
int ret = 0;
mutex_lock(&c->state_lock);
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 = -EINVAL;
goto err;
}
ret = bch2_dev_buckets_resize(c, ca, nbuckets);
if (ret) {
bch_err(ca, "Resize error: %i", ret);
goto err;
}
mutex_lock(&c->sb_lock);
mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
mi->nbuckets = cpu_to_le64(nbuckets);
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
bch2_recalc_capacity(c);
err:
mutex_unlock(&c->state_lock);
return ret;
}
/* return with ref on ca->ref: */
struct bch_dev *bch2_dev_lookup(struct bch_fs *c, const char *path)
{
struct bch_dev *ca;
dev_t dev;
unsigned i;
int ret;
ret = lookup_bdev(path, &dev);
if (ret)
return ERR_PTR(ret);
for_each_member_device(ca, c, i)
if (ca->disk_sb.bdev->bd_dev == dev)
goto found;
ca = ERR_PTR(-ENOENT);
found:
return ca;
}
/* Filesystem open: */
struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
struct bch_opts opts)
{
struct bch_sb_handle *sb = NULL;
struct bch_fs *c = NULL;
unsigned i, best_sb = 0;
const char *err;
int ret = -ENOMEM;
pr_verbose_init(opts, "");
if (!nr_devices) {
c = ERR_PTR(-EINVAL);
goto out2;
}
if (!try_module_get(THIS_MODULE)) {
c = ERR_PTR(-ENODEV);
goto out2;
}
sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
if (!sb)
goto err;
for (i = 0; i < nr_devices; i++) {
ret = bch2_read_super(devices[i], &opts, &sb[i]);
if (ret)
goto err;
err = bch2_sb_validate(&sb[i]);
if (err)
goto err_print;
}
for (i = 1; i < nr_devices; i++)
if (le64_to_cpu(sb[i].sb->seq) >
le64_to_cpu(sb[best_sb].sb->seq))
best_sb = i;
for (i = 0; i < nr_devices; i++) {
err = bch2_dev_in_fs(sb[best_sb].sb, sb[i].sb);
if (err)
goto err_print;
}
ret = -ENOMEM;
c = bch2_fs_alloc(sb[best_sb].sb, opts);
if (!c)
goto err;
err = "bch2_dev_online() error";
mutex_lock(&c->state_lock);
for (i = 0; i < nr_devices; i++)
if (bch2_dev_attach_bdev(c, &sb[i])) {
mutex_unlock(&c->state_lock);
goto err_print;
}
mutex_unlock(&c->state_lock);
err = "insufficient devices";
if (!bch2_fs_may_start(c))
goto err_print;
if (!c->opts.nostart) {
err = bch2_fs_start(c);
if (err)
goto err_print;
}
out:
kfree(sb);
module_put(THIS_MODULE);
out2:
pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
return c;
err_print:
pr_err("bch_fs_open err opening %s: %s",
devices[0], err);
ret = -EINVAL;
err:
if (c)
bch2_fs_stop(c);
for (i = 0; i < nr_devices; i++)
bch2_free_super(&sb[i]);
c = ERR_PTR(ret);
goto out;
}
static const char *__bch2_fs_open_incremental(struct bch_sb_handle *sb,
struct bch_opts opts)
{
const char *err;
struct bch_fs *c;
bool allocated_fs = false;
err = bch2_sb_validate(sb);
if (err)
return err;
mutex_lock(&bch_fs_list_lock);
c = __bch2_uuid_to_fs(sb->sb->uuid);
if (c) {
closure_get(&c->cl);
err = bch2_dev_in_fs(c->disk_sb.sb, sb->sb);
if (err)
goto err;
} else {
c = bch2_fs_alloc(sb->sb, opts);
err = "cannot allocate memory";
if (!c)
goto err;
allocated_fs = true;
}
err = "bch2_dev_online() error";
mutex_lock(&c->sb_lock);
if (bch2_dev_attach_bdev(c, sb)) {
mutex_unlock(&c->sb_lock);
goto err;
}
mutex_unlock(&c->sb_lock);
if (!c->opts.nostart && bch2_fs_may_start(c)) {
err = bch2_fs_start(c);
if (err)
goto err;
}
closure_put(&c->cl);
mutex_unlock(&bch_fs_list_lock);
return NULL;
err:
mutex_unlock(&bch_fs_list_lock);
if (allocated_fs)
bch2_fs_stop(c);
else if (c)
closure_put(&c->cl);
return err;
}
const char *bch2_fs_open_incremental(const char *path)
{
struct bch_sb_handle sb;
struct bch_opts opts = bch2_opts_empty();
const char *err;
if (bch2_read_super(path, &opts, &sb))
return "error reading superblock";
err = __bch2_fs_open_incremental(&sb, opts);
bch2_free_super(&sb);
return err;
}
/* Global interfaces/init */
static void bcachefs_exit(void)
{
bch2_debug_exit();
bch2_vfs_exit();
bch2_chardev_exit();
if (bcachefs_kset)
kset_unregister(bcachefs_kset);
}
static int __init bcachefs_init(void)
{
bch2_bkey_pack_test();
bch2_inode_pack_test();
if (!(bcachefs_kset = kset_create_and_add("bcachefs", NULL, fs_kobj)) ||
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
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);