+++ /dev/null
-// 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);
projects / bcachefs-tools-debian / blobdiff