diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/bcachefs/journal.c | 1439 |
1 files changed, 1439 insertions, 0 deletions
diff --git a/fs/bcachefs/journal.c b/fs/bcachefs/journal.c new file mode 100644 index 0000000000..8cf238be62 --- /dev/null +++ b/fs/bcachefs/journal.c @@ -0,0 +1,1439 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bcachefs journalling code, for btree insertions + * + * Copyright 2012 Google, Inc. + */ + +#include "bcachefs.h" +#include "alloc_foreground.h" +#include "bkey_methods.h" +#include "btree_gc.h" +#include "btree_update.h" +#include "buckets.h" +#include "error.h" +#include "journal.h" +#include "journal_io.h" +#include "journal_reclaim.h" +#include "journal_sb.h" +#include "journal_seq_blacklist.h" +#include "trace.h" + +static const char * const bch2_journal_errors[] = { +#define x(n) #n, + JOURNAL_ERRORS() +#undef x + NULL +}; + +static inline bool journal_seq_unwritten(struct journal *j, u64 seq) +{ + return seq > j->seq_ondisk; +} + +static bool __journal_entry_is_open(union journal_res_state state) +{ + return state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL; +} + +static inline unsigned nr_unwritten_journal_entries(struct journal *j) +{ + return atomic64_read(&j->seq) - j->seq_ondisk; +} + +static bool journal_entry_is_open(struct journal *j) +{ + return __journal_entry_is_open(j->reservations); +} + +static inline struct journal_buf * +journal_seq_to_buf(struct journal *j, u64 seq) +{ + struct journal_buf *buf = NULL; + + EBUG_ON(seq > journal_cur_seq(j)); + + if (journal_seq_unwritten(j, seq)) { + buf = j->buf + (seq & JOURNAL_BUF_MASK); + EBUG_ON(le64_to_cpu(buf->data->seq) != seq); + } + return buf; +} + +static void journal_pin_list_init(struct journal_entry_pin_list *p, int count) +{ + unsigned i; + + for (i = 0; i < ARRAY_SIZE(p->list); i++) + INIT_LIST_HEAD(&p->list[i]); + INIT_LIST_HEAD(&p->flushed); + atomic_set(&p->count, count); + p->devs.nr = 0; +} + +/* + * Detect stuck journal conditions and trigger shutdown. Technically the journal + * can end up stuck for a variety of reasons, such as a blocked I/O, journal + * reservation lockup, etc. Since this is a fatal error with potentially + * unpredictable characteristics, we want to be fairly conservative before we + * decide to shut things down. + * + * Consider the journal stuck when it appears full with no ability to commit + * btree transactions, to discard journal buckets, nor acquire priority + * (reserved watermark) reservation. + */ +static inline bool +journal_error_check_stuck(struct journal *j, int error, unsigned flags) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + bool stuck = false; + struct printbuf buf = PRINTBUF; + + if (!(error == JOURNAL_ERR_journal_full || + error == JOURNAL_ERR_journal_pin_full) || + nr_unwritten_journal_entries(j) || + (flags & BCH_WATERMARK_MASK) != BCH_WATERMARK_reclaim) + return stuck; + + spin_lock(&j->lock); + + if (j->can_discard) { + spin_unlock(&j->lock); + return stuck; + } + + stuck = true; + + /* + * The journal shutdown path will set ->err_seq, but do it here first to + * serialize against concurrent failures and avoid duplicate error + * reports. + */ + if (j->err_seq) { + spin_unlock(&j->lock); + return stuck; + } + j->err_seq = journal_cur_seq(j); + spin_unlock(&j->lock); + + bch_err(c, "Journal stuck! Hava a pre-reservation but journal full (error %s)", + bch2_journal_errors[error]); + bch2_journal_debug_to_text(&buf, j); + bch_err(c, "%s", buf.buf); + + printbuf_reset(&buf); + bch2_journal_pins_to_text(&buf, j); + bch_err(c, "Journal pins:\n%s", buf.buf); + printbuf_exit(&buf); + + bch2_fatal_error(c); + dump_stack(); + + return stuck; +} + +/* + * Final processing when the last reference of a journal buffer has been + * dropped. Drop the pin list reference acquired at journal entry open and write + * the buffer, if requested. + */ +void bch2_journal_buf_put_final(struct journal *j, u64 seq, bool write) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + + lockdep_assert_held(&j->lock); + + if (__bch2_journal_pin_put(j, seq)) + bch2_journal_reclaim_fast(j); + if (write) + closure_call(&j->io, bch2_journal_write, c->io_complete_wq, NULL); +} + +/* + * Returns true if journal entry is now closed: + * + * We don't close a journal_buf until the next journal_buf is finished writing, + * and can be opened again - this also initializes the next journal_buf: + */ +static void __journal_entry_close(struct journal *j, unsigned closed_val) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_buf *buf = journal_cur_buf(j); + union journal_res_state old, new; + u64 v = atomic64_read(&j->reservations.counter); + unsigned sectors; + + BUG_ON(closed_val != JOURNAL_ENTRY_CLOSED_VAL && + closed_val != JOURNAL_ENTRY_ERROR_VAL); + + lockdep_assert_held(&j->lock); + + do { + old.v = new.v = v; + new.cur_entry_offset = closed_val; + + if (old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL || + old.cur_entry_offset == new.cur_entry_offset) + return; + } while ((v = atomic64_cmpxchg(&j->reservations.counter, + old.v, new.v)) != old.v); + + if (!__journal_entry_is_open(old)) + return; + + /* Close out old buffer: */ + buf->data->u64s = cpu_to_le32(old.cur_entry_offset); + + sectors = vstruct_blocks_plus(buf->data, c->block_bits, + buf->u64s_reserved) << c->block_bits; + BUG_ON(sectors > buf->sectors); + buf->sectors = sectors; + + /* + * We have to set last_seq here, _before_ opening a new journal entry: + * + * A threads may replace an old pin with a new pin on their current + * journal reservation - the expectation being that the journal will + * contain either what the old pin protected or what the new pin + * protects. + * + * After the old pin is dropped journal_last_seq() won't include the old + * pin, so we can only write the updated last_seq on the entry that + * contains whatever the new pin protects. + * + * Restated, we can _not_ update last_seq for a given entry if there + * could be a newer entry open with reservations/pins that have been + * taken against it. + * + * Hence, we want update/set last_seq on the current journal entry right + * before we open a new one: + */ + buf->last_seq = journal_last_seq(j); + buf->data->last_seq = cpu_to_le64(buf->last_seq); + BUG_ON(buf->last_seq > le64_to_cpu(buf->data->seq)); + + cancel_delayed_work(&j->write_work); + + bch2_journal_space_available(j); + + __bch2_journal_buf_put(j, old.idx, le64_to_cpu(buf->data->seq)); +} + +void bch2_journal_halt(struct journal *j) +{ + spin_lock(&j->lock); + __journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL); + if (!j->err_seq) + j->err_seq = journal_cur_seq(j); + journal_wake(j); + spin_unlock(&j->lock); +} + +static bool journal_entry_want_write(struct journal *j) +{ + bool ret = !journal_entry_is_open(j) || + journal_cur_seq(j) == journal_last_unwritten_seq(j); + + /* Don't close it yet if we already have a write in flight: */ + if (ret) + __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL); + else if (nr_unwritten_journal_entries(j)) { + struct journal_buf *buf = journal_cur_buf(j); + + if (!buf->flush_time) { + buf->flush_time = local_clock() ?: 1; + buf->expires = jiffies; + } + } + + return ret; +} + +bool bch2_journal_entry_close(struct journal *j) +{ + bool ret; + + spin_lock(&j->lock); + ret = journal_entry_want_write(j); + spin_unlock(&j->lock); + + return ret; +} + +/* + * should _only_ called from journal_res_get() - when we actually want a + * journal reservation - journal entry is open means journal is dirty: + */ +static int journal_entry_open(struct journal *j) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_buf *buf = j->buf + + ((journal_cur_seq(j) + 1) & JOURNAL_BUF_MASK); + union journal_res_state old, new; + int u64s; + u64 v; + + lockdep_assert_held(&j->lock); + BUG_ON(journal_entry_is_open(j)); + BUG_ON(BCH_SB_CLEAN(c->disk_sb.sb)); + + if (j->blocked) + return JOURNAL_ERR_blocked; + + if (j->cur_entry_error) + return j->cur_entry_error; + + if (bch2_journal_error(j)) + return JOURNAL_ERR_insufficient_devices; /* -EROFS */ + + if (!fifo_free(&j->pin)) + return JOURNAL_ERR_journal_pin_full; + + if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf)) + return JOURNAL_ERR_max_in_flight; + + BUG_ON(!j->cur_entry_sectors); + + buf->expires = + (journal_cur_seq(j) == j->flushed_seq_ondisk + ? jiffies + : j->last_flush_write) + + msecs_to_jiffies(c->opts.journal_flush_delay); + + buf->u64s_reserved = j->entry_u64s_reserved; + buf->disk_sectors = j->cur_entry_sectors; + buf->sectors = min(buf->disk_sectors, buf->buf_size >> 9); + + u64s = (int) (buf->sectors << 9) / sizeof(u64) - + journal_entry_overhead(j); + u64s = clamp_t(int, u64s, 0, JOURNAL_ENTRY_CLOSED_VAL - 1); + + if (u64s <= (ssize_t) j->early_journal_entries.nr) + return JOURNAL_ERR_journal_full; + + if (fifo_empty(&j->pin) && j->reclaim_thread) + wake_up_process(j->reclaim_thread); + + /* + * The fifo_push() needs to happen at the same time as j->seq is + * incremented for journal_last_seq() to be calculated correctly + */ + atomic64_inc(&j->seq); + journal_pin_list_init(fifo_push_ref(&j->pin), 1); + + BUG_ON(j->pin.back - 1 != atomic64_read(&j->seq)); + + BUG_ON(j->buf + (journal_cur_seq(j) & JOURNAL_BUF_MASK) != buf); + + bkey_extent_init(&buf->key); + buf->noflush = false; + buf->must_flush = false; + buf->separate_flush = false; + buf->flush_time = 0; + + memset(buf->data, 0, sizeof(*buf->data)); + buf->data->seq = cpu_to_le64(journal_cur_seq(j)); + buf->data->u64s = 0; + + if (j->early_journal_entries.nr) { + memcpy(buf->data->_data, j->early_journal_entries.data, + j->early_journal_entries.nr * sizeof(u64)); + le32_add_cpu(&buf->data->u64s, j->early_journal_entries.nr); + } + + /* + * Must be set before marking the journal entry as open: + */ + j->cur_entry_u64s = u64s; + + v = atomic64_read(&j->reservations.counter); + do { + old.v = new.v = v; + + BUG_ON(old.cur_entry_offset == JOURNAL_ENTRY_ERROR_VAL); + + new.idx++; + BUG_ON(journal_state_count(new, new.idx)); + BUG_ON(new.idx != (journal_cur_seq(j) & JOURNAL_BUF_MASK)); + + journal_state_inc(&new); + + /* Handle any already added entries */ + new.cur_entry_offset = le32_to_cpu(buf->data->u64s); + } while ((v = atomic64_cmpxchg(&j->reservations.counter, + old.v, new.v)) != old.v); + + if (j->res_get_blocked_start) + bch2_time_stats_update(j->blocked_time, + j->res_get_blocked_start); + j->res_get_blocked_start = 0; + + mod_delayed_work(c->io_complete_wq, + &j->write_work, + msecs_to_jiffies(c->opts.journal_flush_delay)); + journal_wake(j); + + if (j->early_journal_entries.nr) + darray_exit(&j->early_journal_entries); + return 0; +} + +static bool journal_quiesced(struct journal *j) +{ + bool ret = atomic64_read(&j->seq) == j->seq_ondisk; + + if (!ret) + bch2_journal_entry_close(j); + return ret; +} + +static void journal_quiesce(struct journal *j) +{ + wait_event(j->wait, journal_quiesced(j)); +} + +static void journal_write_work(struct work_struct *work) +{ + struct journal *j = container_of(work, struct journal, write_work.work); + struct bch_fs *c = container_of(j, struct bch_fs, journal); + long delta; + + spin_lock(&j->lock); + if (!__journal_entry_is_open(j->reservations)) + goto unlock; + + delta = journal_cur_buf(j)->expires - jiffies; + + if (delta > 0) + mod_delayed_work(c->io_complete_wq, &j->write_work, delta); + else + __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL); +unlock: + spin_unlock(&j->lock); +} + +static int __journal_res_get(struct journal *j, struct journal_res *res, + unsigned flags) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_buf *buf; + bool can_discard; + int ret; +retry: + if (journal_res_get_fast(j, res, flags)) + return 0; + + if (bch2_journal_error(j)) + return -BCH_ERR_erofs_journal_err; + + spin_lock(&j->lock); + + /* check once more in case somebody else shut things down... */ + if (bch2_journal_error(j)) { + spin_unlock(&j->lock); + return -BCH_ERR_erofs_journal_err; + } + + /* + * Recheck after taking the lock, so we don't race with another thread + * that just did journal_entry_open() and call bch2_journal_entry_close() + * unnecessarily + */ + if (journal_res_get_fast(j, res, flags)) { + spin_unlock(&j->lock); + return 0; + } + + if ((flags & BCH_WATERMARK_MASK) < j->watermark) { + /* + * Don't want to close current journal entry, just need to + * invoke reclaim: + */ + ret = JOURNAL_ERR_journal_full; + goto unlock; + } + + /* + * If we couldn't get a reservation because the current buf filled up, + * and we had room for a bigger entry on disk, signal that we want to + * realloc the journal bufs: + */ + buf = journal_cur_buf(j); + if (journal_entry_is_open(j) && + buf->buf_size >> 9 < buf->disk_sectors && + buf->buf_size < JOURNAL_ENTRY_SIZE_MAX) + j->buf_size_want = max(j->buf_size_want, buf->buf_size << 1); + + __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL); + ret = journal_entry_open(j); + + if (ret == JOURNAL_ERR_max_in_flight) + trace_and_count(c, journal_entry_full, c); +unlock: + if ((ret && ret != JOURNAL_ERR_insufficient_devices) && + !j->res_get_blocked_start) { + j->res_get_blocked_start = local_clock() ?: 1; + trace_and_count(c, journal_full, c); + } + + can_discard = j->can_discard; + spin_unlock(&j->lock); + + if (!ret) + goto retry; + if (journal_error_check_stuck(j, ret, flags)) + ret = -BCH_ERR_journal_res_get_blocked; + + /* + * Journal is full - can't rely on reclaim from work item due to + * freezing: + */ + if ((ret == JOURNAL_ERR_journal_full || + ret == JOURNAL_ERR_journal_pin_full) && + !(flags & JOURNAL_RES_GET_NONBLOCK)) { + if (can_discard) { + bch2_journal_do_discards(j); + goto retry; + } + + if (mutex_trylock(&j->reclaim_lock)) { + bch2_journal_reclaim(j); + mutex_unlock(&j->reclaim_lock); + } + } + + return ret == JOURNAL_ERR_insufficient_devices + ? -BCH_ERR_erofs_journal_err + : -BCH_ERR_journal_res_get_blocked; +} + +/* + * Essentially the entry function to the journaling code. When bcachefs is doing + * a btree insert, it calls this function to get the current journal write. + * Journal write is the structure used set up journal writes. The calling + * function will then add its keys to the structure, queuing them for the next + * write. + * + * To ensure forward progress, the current task must not be holding any + * btree node write locks. + */ +int bch2_journal_res_get_slowpath(struct journal *j, struct journal_res *res, + unsigned flags) +{ + int ret; + + closure_wait_event(&j->async_wait, + (ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked || + (flags & JOURNAL_RES_GET_NONBLOCK)); + return ret; +} + +/* journal_entry_res: */ + +void bch2_journal_entry_res_resize(struct journal *j, + struct journal_entry_res *res, + unsigned new_u64s) +{ + union journal_res_state state; + int d = new_u64s - res->u64s; + + spin_lock(&j->lock); + + j->entry_u64s_reserved += d; + if (d <= 0) + goto out; + + j->cur_entry_u64s = max_t(int, 0, j->cur_entry_u64s - d); + smp_mb(); + state = READ_ONCE(j->reservations); + + if (state.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL && + state.cur_entry_offset > j->cur_entry_u64s) { + j->cur_entry_u64s += d; + /* + * Not enough room in current journal entry, have to flush it: + */ + __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL); + } else { + journal_cur_buf(j)->u64s_reserved += d; + } +out: + spin_unlock(&j->lock); + res->u64s += d; +} + +/* journal flushing: */ + +/** + * bch2_journal_flush_seq_async - wait for a journal entry to be written + * @j: journal object + * @seq: seq to flush + * @parent: closure object to wait with + * Returns: 1 if @seq has already been flushed, 0 if @seq is being flushed, + * -EIO if @seq will never be flushed + * + * Like bch2_journal_wait_on_seq, except that it triggers a write immediately if + * necessary + */ +int bch2_journal_flush_seq_async(struct journal *j, u64 seq, + struct closure *parent) +{ + struct journal_buf *buf; + int ret = 0; + + if (seq <= j->flushed_seq_ondisk) + return 1; + + spin_lock(&j->lock); + + if (WARN_ONCE(seq > journal_cur_seq(j), + "requested to flush journal seq %llu, but currently at %llu", + seq, journal_cur_seq(j))) + goto out; + + /* Recheck under lock: */ + if (j->err_seq && seq >= j->err_seq) { + ret = -EIO; + goto out; + } + + if (seq <= j->flushed_seq_ondisk) { + ret = 1; + goto out; + } + + /* if seq was written, but not flushed - flush a newer one instead */ + seq = max(seq, journal_last_unwritten_seq(j)); + +recheck_need_open: + if (seq > journal_cur_seq(j)) { + struct journal_res res = { 0 }; + + if (journal_entry_is_open(j)) + __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL); + + spin_unlock(&j->lock); + + ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0); + if (ret) + return ret; + + seq = res.seq; + buf = j->buf + (seq & JOURNAL_BUF_MASK); + buf->must_flush = true; + + if (!buf->flush_time) { + buf->flush_time = local_clock() ?: 1; + buf->expires = jiffies; + } + + if (parent && !closure_wait(&buf->wait, parent)) + BUG(); + + bch2_journal_res_put(j, &res); + + spin_lock(&j->lock); + goto want_write; + } + + /* + * if write was kicked off without a flush, flush the next sequence + * number instead + */ + buf = journal_seq_to_buf(j, seq); + if (buf->noflush) { + seq++; + goto recheck_need_open; + } + + buf->must_flush = true; + + if (parent && !closure_wait(&buf->wait, parent)) + BUG(); +want_write: + if (seq == journal_cur_seq(j)) + journal_entry_want_write(j); +out: + spin_unlock(&j->lock); + return ret; +} + +int bch2_journal_flush_seq(struct journal *j, u64 seq) +{ + u64 start_time = local_clock(); + int ret, ret2; + + /* + * Don't update time_stats when @seq is already flushed: + */ + if (seq <= j->flushed_seq_ondisk) + return 0; + + ret = wait_event_interruptible(j->wait, (ret2 = bch2_journal_flush_seq_async(j, seq, NULL))); + + if (!ret) + bch2_time_stats_update(j->flush_seq_time, start_time); + + return ret ?: ret2 < 0 ? ret2 : 0; +} + +/* + * bch2_journal_flush_async - if there is an open journal entry, or a journal + * still being written, write it and wait for the write to complete + */ +void bch2_journal_flush_async(struct journal *j, struct closure *parent) +{ + bch2_journal_flush_seq_async(j, atomic64_read(&j->seq), parent); +} + +int bch2_journal_flush(struct journal *j) +{ + return bch2_journal_flush_seq(j, atomic64_read(&j->seq)); +} + +/* + * bch2_journal_noflush_seq - tell the journal not to issue any flushes before + * @seq + */ +bool bch2_journal_noflush_seq(struct journal *j, u64 seq) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + u64 unwritten_seq; + bool ret = false; + + if (!(c->sb.features & (1ULL << BCH_FEATURE_journal_no_flush))) + return false; + + if (seq <= c->journal.flushed_seq_ondisk) + return false; + + spin_lock(&j->lock); + if (seq <= c->journal.flushed_seq_ondisk) + goto out; + + for (unwritten_seq = journal_last_unwritten_seq(j); + unwritten_seq < seq; + unwritten_seq++) { + struct journal_buf *buf = journal_seq_to_buf(j, unwritten_seq); + + /* journal write is already in flight, and was a flush write: */ + if (unwritten_seq == journal_last_unwritten_seq(j) && !buf->noflush) + goto out; + + buf->noflush = true; + } + + ret = true; +out: + spin_unlock(&j->lock); + return ret; +} + +int bch2_journal_meta(struct journal *j) +{ + struct journal_buf *buf; + struct journal_res res; + int ret; + + memset(&res, 0, sizeof(res)); + + ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0); + if (ret) + return ret; + + buf = j->buf + (res.seq & JOURNAL_BUF_MASK); + buf->must_flush = true; + + if (!buf->flush_time) { + buf->flush_time = local_clock() ?: 1; + buf->expires = jiffies; + } + + bch2_journal_res_put(j, &res); + + return bch2_journal_flush_seq(j, res.seq); +} + +/* block/unlock the journal: */ + +void bch2_journal_unblock(struct journal *j) +{ + spin_lock(&j->lock); + j->blocked--; + spin_unlock(&j->lock); + + journal_wake(j); +} + +void bch2_journal_block(struct journal *j) +{ + spin_lock(&j->lock); + j->blocked++; + spin_unlock(&j->lock); + + journal_quiesce(j); +} + +/* allocate journal on a device: */ + +static int __bch2_set_nr_journal_buckets(struct bch_dev *ca, unsigned nr, + bool new_fs, struct closure *cl) +{ + struct bch_fs *c = ca->fs; + struct journal_device *ja = &ca->journal; + u64 *new_bucket_seq = NULL, *new_buckets = NULL; + struct open_bucket **ob = NULL; + long *bu = NULL; + unsigned i, pos, nr_got = 0, nr_want = nr - ja->nr; + int ret = 0; + + BUG_ON(nr <= ja->nr); + + bu = kcalloc(nr_want, sizeof(*bu), GFP_KERNEL); + ob = kcalloc(nr_want, sizeof(*ob), GFP_KERNEL); + new_buckets = kcalloc(nr, sizeof(u64), GFP_KERNEL); + new_bucket_seq = kcalloc(nr, sizeof(u64), GFP_KERNEL); + if (!bu || !ob || !new_buckets || !new_bucket_seq) { + ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets; + goto err_free; + } + + for (nr_got = 0; nr_got < nr_want; nr_got++) { + if (new_fs) { + bu[nr_got] = bch2_bucket_alloc_new_fs(ca); + if (bu[nr_got] < 0) { + ret = -BCH_ERR_ENOSPC_bucket_alloc; + break; + } + } else { + ob[nr_got] = bch2_bucket_alloc(c, ca, BCH_WATERMARK_normal, cl); + ret = PTR_ERR_OR_ZERO(ob[nr_got]); + if (ret) + break; + + ret = bch2_trans_run(c, + bch2_trans_mark_metadata_bucket(trans, ca, + ob[nr_got]->bucket, BCH_DATA_journal, + ca->mi.bucket_size)); + if (ret) { + bch2_open_bucket_put(c, ob[nr_got]); + bch_err_msg(c, ret, "marking new journal buckets"); + break; + } + + bu[nr_got] = ob[nr_got]->bucket; + } + } + + if (!nr_got) + goto err_free; + + /* Don't return an error if we successfully allocated some buckets: */ + ret = 0; + + if (c) { + bch2_journal_flush_all_pins(&c->journal); + bch2_journal_block(&c->journal); + mutex_lock(&c->sb_lock); + } + + memcpy(new_buckets, ja->buckets, ja->nr * sizeof(u64)); + memcpy(new_bucket_seq, ja->bucket_seq, ja->nr * sizeof(u64)); + + BUG_ON(ja->discard_idx > ja->nr); + + pos = ja->discard_idx ?: ja->nr; + + memmove(new_buckets + pos + nr_got, + new_buckets + pos, + sizeof(new_buckets[0]) * (ja->nr - pos)); + memmove(new_bucket_seq + pos + nr_got, + new_bucket_seq + pos, + sizeof(new_bucket_seq[0]) * (ja->nr - pos)); + + for (i = 0; i < nr_got; i++) { + new_buckets[pos + i] = bu[i]; + new_bucket_seq[pos + i] = 0; + } + + nr = ja->nr + nr_got; + + ret = bch2_journal_buckets_to_sb(c, ca, new_buckets, nr); + if (ret) + goto err_unblock; + + if (!new_fs) + bch2_write_super(c); + + /* Commit: */ + if (c) + spin_lock(&c->journal.lock); + + swap(new_buckets, ja->buckets); + swap(new_bucket_seq, ja->bucket_seq); + ja->nr = nr; + + if (pos <= ja->discard_idx) + ja->discard_idx = (ja->discard_idx + nr_got) % ja->nr; + if (pos <= ja->dirty_idx_ondisk) + ja->dirty_idx_ondisk = (ja->dirty_idx_ondisk + nr_got) % ja->nr; + if (pos <= ja->dirty_idx) + ja->dirty_idx = (ja->dirty_idx + nr_got) % ja->nr; + if (pos <= ja->cur_idx) + ja->cur_idx = (ja->cur_idx + nr_got) % ja->nr; + + if (c) + spin_unlock(&c->journal.lock); +err_unblock: + if (c) { + bch2_journal_unblock(&c->journal); + mutex_unlock(&c->sb_lock); + } + + if (ret && !new_fs) + for (i = 0; i < nr_got; i++) + bch2_trans_run(c, + bch2_trans_mark_metadata_bucket(trans, ca, + bu[i], BCH_DATA_free, 0)); +err_free: + if (!new_fs) + for (i = 0; i < nr_got; i++) + bch2_open_bucket_put(c, ob[i]); + + kfree(new_bucket_seq); + kfree(new_buckets); + kfree(ob); + kfree(bu); + return ret; +} + +/* + * Allocate more journal space at runtime - not currently making use if it, but + * the code works: + */ +int bch2_set_nr_journal_buckets(struct bch_fs *c, struct bch_dev *ca, + unsigned nr) +{ + struct journal_device *ja = &ca->journal; + struct closure cl; + int ret = 0; + + closure_init_stack(&cl); + + down_write(&c->state_lock); + + /* don't handle reducing nr of buckets yet: */ + if (nr < ja->nr) + goto unlock; + + while (ja->nr < nr) { + struct disk_reservation disk_res = { 0, 0, 0 }; + + /* + * note: journal buckets aren't really counted as _sectors_ used yet, so + * we don't need the disk reservation to avoid the BUG_ON() in buckets.c + * when space used goes up without a reservation - but we do need the + * reservation to ensure we'll actually be able to allocate: + * + * XXX: that's not right, disk reservations only ensure a + * filesystem-wide allocation will succeed, this is a device + * specific allocation - we can hang here: + */ + + ret = bch2_disk_reservation_get(c, &disk_res, + bucket_to_sector(ca, nr - ja->nr), 1, 0); + if (ret) + break; + + ret = __bch2_set_nr_journal_buckets(ca, nr, false, &cl); + + bch2_disk_reservation_put(c, &disk_res); + + closure_sync(&cl); + + if (ret && ret != -BCH_ERR_bucket_alloc_blocked) + break; + } + + if (ret) + bch_err_fn(c, ret); +unlock: + up_write(&c->state_lock); + return ret; +} + +int bch2_dev_journal_alloc(struct bch_dev *ca) +{ + unsigned nr; + int ret; + + if (dynamic_fault("bcachefs:add:journal_alloc")) { + ret = -BCH_ERR_ENOMEM_set_nr_journal_buckets; + goto err; + } + + /* 1/128th of the device by default: */ + nr = ca->mi.nbuckets >> 7; + + /* + * clamp journal size to 8192 buckets or 8GB (in sectors), whichever + * is smaller: + */ + nr = clamp_t(unsigned, nr, + BCH_JOURNAL_BUCKETS_MIN, + min(1 << 13, + (1 << 24) / ca->mi.bucket_size)); + + ret = __bch2_set_nr_journal_buckets(ca, nr, true, NULL); +err: + if (ret) + bch_err_fn(ca, ret); + return ret; +} + +int bch2_fs_journal_alloc(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i; + + for_each_online_member(ca, c, i) { + if (ca->journal.nr) + continue; + + int ret = bch2_dev_journal_alloc(ca); + if (ret) { + percpu_ref_put(&ca->io_ref); + return ret; + } + } + + return 0; +} + +/* startup/shutdown: */ + +static bool bch2_journal_writing_to_device(struct journal *j, unsigned dev_idx) +{ + bool ret = false; + u64 seq; + + spin_lock(&j->lock); + for (seq = journal_last_unwritten_seq(j); + seq <= journal_cur_seq(j) && !ret; + seq++) { + struct journal_buf *buf = journal_seq_to_buf(j, seq); + + if (bch2_bkey_has_device_c(bkey_i_to_s_c(&buf->key), dev_idx)) + ret = true; + } + spin_unlock(&j->lock); + + return ret; +} + +void bch2_dev_journal_stop(struct journal *j, struct bch_dev *ca) +{ + wait_event(j->wait, !bch2_journal_writing_to_device(j, ca->dev_idx)); +} + +void bch2_fs_journal_stop(struct journal *j) +{ + bch2_journal_reclaim_stop(j); + bch2_journal_flush_all_pins(j); + + wait_event(j->wait, bch2_journal_entry_close(j)); + + /* + * Always write a new journal entry, to make sure the clock hands are up + * to date (and match the superblock) + */ + bch2_journal_meta(j); + + journal_quiesce(j); + + BUG_ON(!bch2_journal_error(j) && + test_bit(JOURNAL_REPLAY_DONE, &j->flags) && + j->last_empty_seq != journal_cur_seq(j)); + + cancel_delayed_work_sync(&j->write_work); +} + +int bch2_fs_journal_start(struct journal *j, u64 cur_seq) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_entry_pin_list *p; + struct journal_replay *i, **_i; + struct genradix_iter iter; + bool had_entries = false; + unsigned ptr; + u64 last_seq = cur_seq, nr, seq; + + genradix_for_each_reverse(&c->journal_entries, iter, _i) { + i = *_i; + + if (!i || i->ignore) + continue; + + last_seq = le64_to_cpu(i->j.last_seq); + break; + } + + nr = cur_seq - last_seq; + + if (nr + 1 > j->pin.size) { + free_fifo(&j->pin); + init_fifo(&j->pin, roundup_pow_of_two(nr + 1), GFP_KERNEL); + if (!j->pin.data) { + bch_err(c, "error reallocating journal fifo (%llu open entries)", nr); + return -BCH_ERR_ENOMEM_journal_pin_fifo; + } + } + + j->replay_journal_seq = last_seq; + j->replay_journal_seq_end = cur_seq; + j->last_seq_ondisk = last_seq; + j->flushed_seq_ondisk = cur_seq - 1; + j->seq_ondisk = cur_seq - 1; + j->pin.front = last_seq; + j->pin.back = cur_seq; + atomic64_set(&j->seq, cur_seq - 1); + + fifo_for_each_entry_ptr(p, &j->pin, seq) + journal_pin_list_init(p, 1); + + genradix_for_each(&c->journal_entries, iter, _i) { + i = *_i; + + if (!i || i->ignore) + continue; + + seq = le64_to_cpu(i->j.seq); + BUG_ON(seq >= cur_seq); + + if (seq < last_seq) + continue; + + if (journal_entry_empty(&i->j)) + j->last_empty_seq = le64_to_cpu(i->j.seq); + + p = journal_seq_pin(j, seq); + + p->devs.nr = 0; + for (ptr = 0; ptr < i->nr_ptrs; ptr++) + bch2_dev_list_add_dev(&p->devs, i->ptrs[ptr].dev); + + had_entries = true; + } + + if (!had_entries) + j->last_empty_seq = cur_seq; + + spin_lock(&j->lock); + + set_bit(JOURNAL_STARTED, &j->flags); + j->last_flush_write = jiffies; + + j->reservations.idx = j->reservations.unwritten_idx = journal_cur_seq(j); + j->reservations.unwritten_idx++; + + c->last_bucket_seq_cleanup = journal_cur_seq(j); + + bch2_journal_space_available(j); + spin_unlock(&j->lock); + + return bch2_journal_reclaim_start(j); +} + +/* init/exit: */ + +void bch2_dev_journal_exit(struct bch_dev *ca) +{ + kfree(ca->journal.bio); + kfree(ca->journal.buckets); + kfree(ca->journal.bucket_seq); + + ca->journal.bio = NULL; + ca->journal.buckets = NULL; + ca->journal.bucket_seq = NULL; +} + +int bch2_dev_journal_init(struct bch_dev *ca, struct bch_sb *sb) +{ + struct journal_device *ja = &ca->journal; + struct bch_sb_field_journal *journal_buckets = + bch2_sb_field_get(sb, journal); + struct bch_sb_field_journal_v2 *journal_buckets_v2 = + bch2_sb_field_get(sb, journal_v2); + unsigned i, nr_bvecs; + + ja->nr = 0; + + if (journal_buckets_v2) { + unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); + + for (i = 0; i < nr; i++) + ja->nr += le64_to_cpu(journal_buckets_v2->d[i].nr); + } else if (journal_buckets) { + ja->nr = bch2_nr_journal_buckets(journal_buckets); + } + + ja->bucket_seq = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); + if (!ja->bucket_seq) + return -BCH_ERR_ENOMEM_dev_journal_init; + + nr_bvecs = DIV_ROUND_UP(JOURNAL_ENTRY_SIZE_MAX, PAGE_SIZE); + + ca->journal.bio = bio_kmalloc(nr_bvecs, GFP_KERNEL); + if (!ca->journal.bio) + return -BCH_ERR_ENOMEM_dev_journal_init; + + bio_init(ca->journal.bio, NULL, ca->journal.bio->bi_inline_vecs, nr_bvecs, 0); + + ja->buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); + if (!ja->buckets) + return -BCH_ERR_ENOMEM_dev_journal_init; + + if (journal_buckets_v2) { + unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); + unsigned j, dst = 0; + + for (i = 0; i < nr; i++) + for (j = 0; j < le64_to_cpu(journal_buckets_v2->d[i].nr); j++) + ja->buckets[dst++] = + le64_to_cpu(journal_buckets_v2->d[i].start) + j; + } else if (journal_buckets) { + for (i = 0; i < ja->nr; i++) + ja->buckets[i] = le64_to_cpu(journal_buckets->buckets[i]); + } + + return 0; +} + +void bch2_fs_journal_exit(struct journal *j) +{ + unsigned i; + + darray_exit(&j->early_journal_entries); + + for (i = 0; i < ARRAY_SIZE(j->buf); i++) + kvpfree(j->buf[i].data, j->buf[i].buf_size); + free_fifo(&j->pin); +} + +int bch2_fs_journal_init(struct journal *j) +{ + static struct lock_class_key res_key; + unsigned i; + + spin_lock_init(&j->lock); + spin_lock_init(&j->err_lock); + init_waitqueue_head(&j->wait); + INIT_DELAYED_WORK(&j->write_work, journal_write_work); + init_waitqueue_head(&j->reclaim_wait); + init_waitqueue_head(&j->pin_flush_wait); + mutex_init(&j->reclaim_lock); + mutex_init(&j->discard_lock); + + lockdep_init_map(&j->res_map, "journal res", &res_key, 0); + + atomic64_set(&j->reservations.counter, + ((union journal_res_state) + { .cur_entry_offset = JOURNAL_ENTRY_CLOSED_VAL }).v); + + if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL))) + return -BCH_ERR_ENOMEM_journal_pin_fifo; + + for (i = 0; i < ARRAY_SIZE(j->buf); i++) { + j->buf[i].buf_size = JOURNAL_ENTRY_SIZE_MIN; + j->buf[i].data = kvpmalloc(j->buf[i].buf_size, GFP_KERNEL); + if (!j->buf[i].data) + return -BCH_ERR_ENOMEM_journal_buf; + } + + j->pin.front = j->pin.back = 1; + return 0; +} + +/* debug: */ + +void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + union journal_res_state s; + struct bch_dev *ca; + unsigned long now = jiffies; + u64 seq; + unsigned i; + + if (!out->nr_tabstops) + printbuf_tabstop_push(out, 24); + out->atomic++; + + rcu_read_lock(); + s = READ_ONCE(j->reservations); + + prt_printf(out, "dirty journal entries:\t%llu/%llu\n", fifo_used(&j->pin), j->pin.size); + prt_printf(out, "seq:\t\t\t%llu\n", journal_cur_seq(j)); + prt_printf(out, "seq_ondisk:\t\t%llu\n", j->seq_ondisk); + prt_printf(out, "last_seq:\t\t%llu\n", journal_last_seq(j)); + prt_printf(out, "last_seq_ondisk:\t%llu\n", j->last_seq_ondisk); + prt_printf(out, "flushed_seq_ondisk:\t%llu\n", j->flushed_seq_ondisk); + prt_printf(out, "watermark:\t\t%s\n", bch2_watermarks[j->watermark]); + prt_printf(out, "each entry reserved:\t%u\n", j->entry_u64s_reserved); + prt_printf(out, "nr flush writes:\t%llu\n", j->nr_flush_writes); + prt_printf(out, "nr noflush writes:\t%llu\n", j->nr_noflush_writes); + prt_printf(out, "nr direct reclaim:\t%llu\n", j->nr_direct_reclaim); + prt_printf(out, "nr background reclaim:\t%llu\n", j->nr_background_reclaim); + prt_printf(out, "reclaim kicked:\t\t%u\n", j->reclaim_kicked); + prt_printf(out, "reclaim runs in:\t%u ms\n", time_after(j->next_reclaim, now) + ? jiffies_to_msecs(j->next_reclaim - jiffies) : 0); + prt_printf(out, "current entry sectors:\t%u\n", j->cur_entry_sectors); + prt_printf(out, "current entry error:\t%s\n", bch2_journal_errors[j->cur_entry_error]); + prt_printf(out, "current entry:\t\t"); + + switch (s.cur_entry_offset) { + case JOURNAL_ENTRY_ERROR_VAL: + prt_printf(out, "error"); + break; + case JOURNAL_ENTRY_CLOSED_VAL: + prt_printf(out, "closed"); + break; + default: + prt_printf(out, "%u/%u", s.cur_entry_offset, j->cur_entry_u64s); + break; + } + + prt_newline(out); + + for (seq = journal_cur_seq(j); + seq >= journal_last_unwritten_seq(j); + --seq) { + i = seq & JOURNAL_BUF_MASK; + + prt_printf(out, "unwritten entry:"); + prt_tab(out); + prt_printf(out, "%llu", seq); + prt_newline(out); + printbuf_indent_add(out, 2); + + prt_printf(out, "refcount:"); + prt_tab(out); + prt_printf(out, "%u", journal_state_count(s, i)); + prt_newline(out); + + prt_printf(out, "sectors:"); + prt_tab(out); + prt_printf(out, "%u", j->buf[i].sectors); + prt_newline(out); + + prt_printf(out, "expires"); + prt_tab(out); + prt_printf(out, "%li jiffies", j->buf[i].expires - jiffies); + prt_newline(out); + + printbuf_indent_sub(out, 2); + } + + prt_printf(out, + "replay done:\t\t%i\n", + test_bit(JOURNAL_REPLAY_DONE, &j->flags)); + + prt_printf(out, "space:\n"); + prt_printf(out, "\tdiscarded\t%u:%u\n", + j->space[journal_space_discarded].next_entry, + j->space[journal_space_discarded].total); + prt_printf(out, "\tclean ondisk\t%u:%u\n", + j->space[journal_space_clean_ondisk].next_entry, + j->space[journal_space_clean_ondisk].total); + prt_printf(out, "\tclean\t\t%u:%u\n", + j->space[journal_space_clean].next_entry, + j->space[journal_space_clean].total); + prt_printf(out, "\ttotal\t\t%u:%u\n", + j->space[journal_space_total].next_entry, + j->space[journal_space_total].total); + + for_each_member_device_rcu(ca, c, i, + &c->rw_devs[BCH_DATA_journal]) { + struct journal_device *ja = &ca->journal; + + if (!test_bit(ca->dev_idx, c->rw_devs[BCH_DATA_journal].d)) + continue; + + if (!ja->nr) + continue; + + prt_printf(out, "dev %u:\n", i); + prt_printf(out, "\tnr\t\t%u\n", ja->nr); + prt_printf(out, "\tbucket size\t%u\n", ca->mi.bucket_size); + prt_printf(out, "\tavailable\t%u:%u\n", bch2_journal_dev_buckets_available(j, ja, journal_space_discarded), ja->sectors_free); + prt_printf(out, "\tdiscard_idx\t%u\n", ja->discard_idx); + prt_printf(out, "\tdirty_ondisk\t%u (seq %llu)\n", ja->dirty_idx_ondisk, ja->bucket_seq[ja->dirty_idx_ondisk]); + prt_printf(out, "\tdirty_idx\t%u (seq %llu)\n", ja->dirty_idx, ja->bucket_seq[ja->dirty_idx]); + prt_printf(out, "\tcur_idx\t\t%u (seq %llu)\n", ja->cur_idx, ja->bucket_seq[ja->cur_idx]); + } + + rcu_read_unlock(); + + --out->atomic; +} + +void bch2_journal_debug_to_text(struct printbuf *out, struct journal *j) +{ + spin_lock(&j->lock); + __bch2_journal_debug_to_text(out, j); + spin_unlock(&j->lock); +} + +bool bch2_journal_seq_pins_to_text(struct printbuf *out, struct journal *j, u64 *seq) +{ + struct journal_entry_pin_list *pin_list; + struct journal_entry_pin *pin; + unsigned i; + + spin_lock(&j->lock); + *seq = max(*seq, j->pin.front); + + if (*seq >= j->pin.back) { + spin_unlock(&j->lock); + return true; + } + + out->atomic++; + + pin_list = journal_seq_pin(j, *seq); + + prt_printf(out, "%llu: count %u", *seq, atomic_read(&pin_list->count)); + prt_newline(out); + printbuf_indent_add(out, 2); + + for (i = 0; i < ARRAY_SIZE(pin_list->list); i++) + list_for_each_entry(pin, &pin_list->list[i], list) { + prt_printf(out, "\t%px %ps", pin, pin->flush); + prt_newline(out); + } + + if (!list_empty(&pin_list->flushed)) { + prt_printf(out, "flushed:"); + prt_newline(out); + } + + list_for_each_entry(pin, &pin_list->flushed, list) { + prt_printf(out, "\t%px %ps", pin, pin->flush); + prt_newline(out); + } + + printbuf_indent_sub(out, 2); + + --out->atomic; + spin_unlock(&j->lock); + + return false; +} + +void bch2_journal_pins_to_text(struct printbuf *out, struct journal *j) +{ + u64 seq = 0; + + while (!bch2_journal_seq_pins_to_text(out, j, &seq)) + seq++; +} |