diff options
Diffstat (limited to 'fs/bcachefs/journal.c')
| -rw-r--r-- | fs/bcachefs/journal.c | 1832 |
1 files changed, 0 insertions, 1832 deletions
diff --git a/fs/bcachefs/journal.c b/fs/bcachefs/journal.c deleted file mode 100644 index ddfeb0dafc9d..000000000000 --- a/fs/bcachefs/journal.c +++ /dev/null @@ -1,1832 +0,0 @@ -// 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 "btree_write_buffer.h" -#include "buckets.h" -#include "enumerated_ref.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 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 void bch2_journal_buf_to_text(struct printbuf *out, struct journal *j, u64 seq) -{ - union journal_res_state s = READ_ONCE(j->reservations); - unsigned i = seq & JOURNAL_BUF_MASK; - struct journal_buf *buf = j->buf + i; - - prt_printf(out, "seq:\t%llu\n", seq); - printbuf_indent_add(out, 2); - - if (!buf->write_started) - prt_printf(out, "refcount:\t%u\n", journal_state_count(s, i & JOURNAL_STATE_BUF_MASK)); - - struct closure *cl = &buf->io; - int r = atomic_read(&cl->remaining); - prt_printf(out, "io:\t%pS r %i\n", cl->fn, r & CLOSURE_REMAINING_MASK); - - if (buf->data) { - prt_printf(out, "size:\t"); - prt_human_readable_u64(out, vstruct_bytes(buf->data)); - prt_newline(out); - } - - prt_printf(out, "expires:\t%li jiffies\n", buf->expires - jiffies); - - prt_printf(out, "flags:\t"); - if (buf->noflush) - prt_str(out, "noflush "); - if (buf->must_flush) - prt_str(out, "must_flush "); - if (buf->separate_flush) - prt_str(out, "separate_flush "); - if (buf->need_flush_to_write_buffer) - prt_str(out, "need_flush_to_write_buffer "); - if (buf->write_started) - prt_str(out, "write_started "); - if (buf->write_allocated) - prt_str(out, "write_allocated "); - if (buf->write_done) - prt_str(out, "write_done"); - prt_newline(out); - - printbuf_indent_sub(out, 2); -} - -static void bch2_journal_bufs_to_text(struct printbuf *out, struct journal *j) -{ - lockdep_assert_held(&j->lock); - out->atomic++; - - if (!out->nr_tabstops) - printbuf_tabstop_push(out, 24); - - for (u64 seq = journal_last_unwritten_seq(j); - seq <= journal_cur_seq(j); - seq++) - bch2_journal_buf_to_text(out, j, seq); - prt_printf(out, "last buf %s\n", journal_entry_is_open(j) ? "open" : "closed"); - - --out->atomic; -} - -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); - return buf; -} - -static void journal_pin_list_init(struct journal_entry_pin_list *p, int count) -{ - for (unsigned i = 0; i < ARRAY_SIZE(p->unflushed); i++) - INIT_LIST_HEAD(&p->unflushed[i]); - for (unsigned i = 0; i < ARRAY_SIZE(p->flushed); i++) - INIT_LIST_HEAD(&p->flushed[i]); - 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; - - buf.atomic++; - - if (!(error == -BCH_ERR_journal_full || - error == -BCH_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); - - __bch2_journal_debug_to_text(&buf, j); - spin_unlock(&j->lock); - prt_printf(&buf, bch2_fmt(c, "Journal stuck! Hava a pre-reservation but journal full (error %s)"), - bch2_err_str(error)); - bch2_print_str(c, KERN_ERR, 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; -} - -void bch2_journal_do_writes(struct journal *j) -{ - for (u64 seq = journal_last_unwritten_seq(j); - seq <= journal_cur_seq(j); - seq++) { - unsigned idx = seq & JOURNAL_BUF_MASK; - struct journal_buf *w = j->buf + idx; - - if (w->write_started && !w->write_allocated) - break; - if (w->write_started) - continue; - - if (!journal_state_seq_count(j, j->reservations, seq)) { - j->seq_write_started = seq; - w->write_started = true; - closure_call(&w->io, bch2_journal_write, j->wq, NULL); - } - - break; - } -} - -/* - * 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) -{ - lockdep_assert_held(&j->lock); - - if (__bch2_journal_pin_put(j, seq)) - bch2_journal_reclaim_fast(j); - bch2_journal_do_writes(j); - - /* - * for __bch2_next_write_buffer_flush_journal_buf(), when quiescing an - * open journal entry - */ - wake_up(&j->wait); -} - -/* - * 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, bool trace) -{ - 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; - unsigned sectors; - - BUG_ON(closed_val != JOURNAL_ENTRY_CLOSED_VAL && - closed_val != JOURNAL_ENTRY_ERROR_VAL); - - lockdep_assert_held(&j->lock); - - old.v = atomic64_read(&j->reservations.counter); - do { - new.v = old.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 (!atomic64_try_cmpxchg(&j->reservations.counter, - &old.v, new.v)); - - if (!__journal_entry_is_open(old)) - return; - - if (old.cur_entry_offset == JOURNAL_ENTRY_BLOCKED_VAL) - old.cur_entry_offset = j->cur_entry_offset_if_blocked; - - /* Close out old buffer: */ - buf->data->u64s = cpu_to_le32(old.cur_entry_offset); - - if (trace_journal_entry_close_enabled() && trace) { - struct printbuf pbuf = PRINTBUF; - pbuf.atomic++; - - prt_str(&pbuf, "entry size: "); - prt_human_readable_u64(&pbuf, vstruct_bytes(buf->data)); - prt_newline(&pbuf); - bch2_prt_task_backtrace(&pbuf, current, 1, GFP_NOWAIT); - trace_journal_entry_close(c, pbuf.buf); - printbuf_exit(&pbuf); - } - - sectors = vstruct_blocks_plus(buf->data, c->block_bits, - buf->u64s_reserved) << c->block_bits; - if (unlikely(sectors > buf->sectors)) { - struct printbuf err = PRINTBUF; - err.atomic++; - - prt_printf(&err, "journal entry overran reserved space: %u > %u\n", - sectors, buf->sectors); - prt_printf(&err, "buf u64s %u u64s reserved %u cur_entry_u64s %u block_bits %u\n", - le32_to_cpu(buf->data->u64s), buf->u64s_reserved, - j->cur_entry_u64s, - c->block_bits); - prt_printf(&err, "fatal error - emergency read only"); - bch2_journal_halt_locked(j); - - bch_err(c, "%s", err.buf); - printbuf_exit(&err); - return; - } - - 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, le64_to_cpu(buf->data->seq)); -} - -void bch2_journal_halt_locked(struct journal *j) -{ - lockdep_assert_held(&j->lock); - - __journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL, true); - if (!j->err_seq) - j->err_seq = journal_cur_seq(j); - journal_wake(j); -} - -void bch2_journal_halt(struct journal *j) -{ - spin_lock(&j->lock); - bch2_journal_halt_locked(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, true); - 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; - - 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 bch_err_throw(c, journal_blocked); - - if (j->cur_entry_error) - return j->cur_entry_error; - - int ret = bch2_journal_error(j); - if (unlikely(ret)) - return ret; - - if (!fifo_free(&j->pin)) - return bch_err_throw(c, journal_pin_full); - - if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf)) - return bch_err_throw(c, journal_max_in_flight); - - if (atomic64_read(&j->seq) - j->seq_write_started == JOURNAL_STATE_BUF_NR) - return bch_err_throw(c, journal_max_open); - - if (unlikely(journal_cur_seq(j) >= JOURNAL_SEQ_MAX)) { - bch_err(c, "cannot start: journal seq overflow"); - if (bch2_fs_emergency_read_only_locked(c)) - bch_err(c, "fatal error - emergency read only"); - return bch_err_throw(c, journal_shutdown); - } - - if (!j->free_buf && !buf->data) - return bch_err_throw(c, journal_buf_enomem); /* will retry after write completion frees up a buf */ - - BUG_ON(!j->cur_entry_sectors); - - if (!buf->data) { - swap(buf->data, j->free_buf); - swap(buf->buf_size, j->free_buf_size); - } - - 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 bch_err_throw(c, 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); - - if (unlikely(bch2_journal_seq_is_blacklisted(c, journal_cur_seq(j), false))) { - bch_err(c, "attempting to open blacklisted journal seq %llu", - journal_cur_seq(j)); - if (bch2_fs_emergency_read_only_locked(c)) - bch_err(c, "fatal error - emergency read only"); - return bch_err_throw(c, journal_shutdown); - } - - 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; - buf->need_flush_to_write_buffer = true; - buf->write_started = false; - buf->write_allocated = false; - buf->write_done = false; - - 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; - - old.v = atomic64_read(&j->reservations.counter); - do { - new.v = old.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_STATE_BUF_MASK)); - - journal_state_inc(&new); - - /* Handle any already added entries */ - new.cur_entry_offset = le32_to_cpu(buf->data->u64s); - } while (!atomic64_try_cmpxchg(&j->reservations.counter, - &old.v, new.v)); - - if (nr_unwritten_journal_entries(j) == 1) - mod_delayed_work(j->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); - - spin_lock(&j->lock); - if (__journal_entry_is_open(j->reservations)) { - long delta = journal_cur_buf(j)->expires - jiffies; - - if (delta > 0) - mod_delayed_work(j->wq, &j->write_work, delta); - else - __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true); - } - spin_unlock(&j->lock); -} - -static void journal_buf_prealloc(struct journal *j) -{ - if (j->free_buf && - j->free_buf_size >= j->buf_size_want) - return; - - unsigned buf_size = j->buf_size_want; - - spin_unlock(&j->lock); - void *buf = kvmalloc(buf_size, GFP_NOFS); - spin_lock(&j->lock); - - if (buf && - (!j->free_buf || - buf_size > j->free_buf_size)) { - swap(buf, j->free_buf); - swap(buf_size, j->free_buf_size); - } - - if (unlikely(buf)) { - spin_unlock(&j->lock); - /* kvfree can sleep */ - kvfree(buf); - spin_lock(&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; - - ret = bch2_journal_error(j); - if (unlikely(ret)) - return ret; - - if (j->blocked) - return bch_err_throw(c, journal_blocked); - - if ((flags & BCH_WATERMARK_MASK) < j->watermark) { - ret = bch_err_throw(c, journal_full); - can_discard = j->can_discard; - goto out; - } - - if (nr_unwritten_journal_entries(j) == ARRAY_SIZE(j->buf) && !journal_entry_is_open(j)) { - ret = bch_err_throw(c, journal_max_in_flight); - goto out; - } - - spin_lock(&j->lock); - - journal_buf_prealloc(j); - - /* - * 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)) { - ret = 0; - 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, false); - ret = journal_entry_open(j) ?: -BCH_ERR_journal_retry_open; -unlock: - can_discard = j->can_discard; - spin_unlock(&j->lock); -out: - if (likely(!ret)) - return 0; - if (ret == -BCH_ERR_journal_retry_open) - goto retry; - - if (journal_error_check_stuck(j, ret, flags)) - ret = bch_err_throw(c, journal_stuck); - - if (ret == -BCH_ERR_journal_max_in_flight && - track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight], true) && - trace_journal_entry_full_enabled()) { - struct printbuf buf = PRINTBUF; - - bch2_printbuf_make_room(&buf, 4096); - - spin_lock(&j->lock); - prt_printf(&buf, "seq %llu\n", journal_cur_seq(j)); - bch2_journal_bufs_to_text(&buf, j); - spin_unlock(&j->lock); - - trace_journal_entry_full(c, buf.buf); - printbuf_exit(&buf); - count_event(c, journal_entry_full); - } - - if (ret == -BCH_ERR_journal_max_open && - track_event_change(&c->times[BCH_TIME_blocked_journal_max_open], true) && - trace_journal_entry_full_enabled()) { - struct printbuf buf = PRINTBUF; - - bch2_printbuf_make_room(&buf, 4096); - - spin_lock(&j->lock); - prt_printf(&buf, "seq %llu\n", journal_cur_seq(j)); - bch2_journal_bufs_to_text(&buf, j); - spin_unlock(&j->lock); - - trace_journal_entry_full(c, buf.buf); - printbuf_exit(&buf); - count_event(c, journal_entry_full); - } - - /* - * Journal is full - can't rely on reclaim from work item due to - * freezing: - */ - if ((ret == -BCH_ERR_journal_full || - ret == -BCH_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; -} - -static unsigned max_dev_latency(struct bch_fs *c) -{ - u64 nsecs = 0; - - guard(rcu)(); - for_each_rw_member_rcu(c, ca) - nsecs = max(nsecs, ca->io_latency[WRITE].stats.max_duration); - - return nsecs_to_jiffies(nsecs); -} - -/* - * 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, - struct btree_trans *trans) -{ - int ret; - - if (closure_wait_event_timeout(&j->async_wait, - !bch2_err_matches(ret = __journal_res_get(j, res, flags), BCH_ERR_operation_blocked) || - (flags & JOURNAL_RES_GET_NONBLOCK), - HZ)) - return ret; - - if (trans) - bch2_trans_unlock_long(trans); - - struct bch_fs *c = container_of(j, struct bch_fs, journal); - int remaining_wait = max(max_dev_latency(c) * 2, HZ * 10); - - remaining_wait = max(0, remaining_wait - HZ); - - if (closure_wait_event_timeout(&j->async_wait, - !bch2_err_matches(ret = __journal_res_get(j, res, flags), BCH_ERR_operation_blocked) || - (flags & JOURNAL_RES_GET_NONBLOCK), - remaining_wait)) - return ret; - - struct printbuf buf = PRINTBUF; - bch2_journal_debug_to_text(&buf, j); - bch2_print_str(c, KERN_ERR, buf.buf); - prt_printf(&buf, bch2_fmt(c, "Journal stuck? Waited for 10 seconds, err %s"), bch2_err_str(ret)); - printbuf_exit(&buf); - - closure_wait_event(&j->async_wait, - !bch2_err_matches(ret = __journal_res_get(j, res, flags), BCH_ERR_operation_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); - 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, true); - } 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, - * -BCH_ERR_journal_flush_err 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 bch_fs *c = container_of(j, struct bch_fs, journal); - 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 = bch_err_throw(c, journal_flush_err); - 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, true); - - spin_unlock(&j->lock); - - /* - * We're called from bch2_journal_flush_seq() -> wait_event(); - * but this might block. We won't usually block, so we won't - * livelock: - */ - sched_annotate_sleep(); - ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0, NULL); - if (ret) - return ret; - - seq = res.seq; - buf = journal_seq_to_buf(j, seq); - 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, or if we promised it - * wouldn't be 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; - j->flushing_seq = max(j->flushing_seq, seq); - - 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, unsigned task_state) -{ - 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_state(j->wait, - (ret2 = bch2_journal_flush_seq_async(j, seq, NULL)), - task_state); - - 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), TASK_UNINTERRUPTIBLE); -} - -/* - * bch2_journal_noflush_seq - ask the journal not to issue any flushes in the - * range [start, end) - * @seq - */ -bool bch2_journal_noflush_seq(struct journal *j, u64 start, u64 end) -{ - 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 (c->journal.flushed_seq_ondisk >= start) - return false; - - spin_lock(&j->lock); - if (c->journal.flushed_seq_ondisk >= start) - goto out; - - for (unwritten_seq = journal_last_unwritten_seq(j); - unwritten_seq < end; - unwritten_seq++) { - struct journal_buf *buf = journal_seq_to_buf(j, unwritten_seq); - - /* journal flush already in flight, or flush requseted */ - if (buf->must_flush) - goto out; - - buf->noflush = true; - } - - ret = true; -out: - spin_unlock(&j->lock); - return ret; -} - -static int __bch2_journal_meta(struct journal *j) -{ - struct journal_res res = {}; - int ret = bch2_journal_res_get(j, &res, jset_u64s(0), 0, NULL); - if (ret) - return ret; - - struct journal_buf *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, TASK_UNINTERRUPTIBLE); -} - -int bch2_journal_meta(struct journal *j) -{ - struct bch_fs *c = container_of(j, struct bch_fs, journal); - - if (!enumerated_ref_tryget(&c->writes, BCH_WRITE_REF_journal)) - return bch_err_throw(c, erofs_no_writes); - - int ret = __bch2_journal_meta(j); - enumerated_ref_put(&c->writes, BCH_WRITE_REF_journal); - return ret; -} - -/* block/unlock the journal: */ - -void bch2_journal_unblock(struct journal *j) -{ - spin_lock(&j->lock); - if (!--j->blocked && - j->cur_entry_offset_if_blocked < JOURNAL_ENTRY_CLOSED_VAL && - j->reservations.cur_entry_offset == JOURNAL_ENTRY_BLOCKED_VAL) { - union journal_res_state old, new; - - old.v = atomic64_read(&j->reservations.counter); - do { - new.v = old.v; - new.cur_entry_offset = j->cur_entry_offset_if_blocked; - } while (!atomic64_try_cmpxchg(&j->reservations.counter, &old.v, new.v)); - } - spin_unlock(&j->lock); - - journal_wake(j); -} - -static void __bch2_journal_block(struct journal *j) -{ - if (!j->blocked++) { - union journal_res_state old, new; - - old.v = atomic64_read(&j->reservations.counter); - do { - j->cur_entry_offset_if_blocked = old.cur_entry_offset; - - if (j->cur_entry_offset_if_blocked >= JOURNAL_ENTRY_CLOSED_VAL) - break; - - new.v = old.v; - new.cur_entry_offset = JOURNAL_ENTRY_BLOCKED_VAL; - } while (!atomic64_try_cmpxchg(&j->reservations.counter, &old.v, new.v)); - - if (old.cur_entry_offset < JOURNAL_ENTRY_BLOCKED_VAL) - journal_cur_buf(j)->data->u64s = cpu_to_le32(old.cur_entry_offset); - } -} - -void bch2_journal_block(struct journal *j) -{ - spin_lock(&j->lock); - __bch2_journal_block(j); - spin_unlock(&j->lock); - - journal_quiesce(j); -} - -static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct journal *j, - u64 max_seq, bool *blocked) -{ - struct journal_buf *ret = NULL; - - /* We're inside wait_event(), but using mutex_lock(: */ - sched_annotate_sleep(); - mutex_lock(&j->buf_lock); - spin_lock(&j->lock); - max_seq = min(max_seq, journal_cur_seq(j)); - - for (u64 seq = journal_last_unwritten_seq(j); - seq <= max_seq; - seq++) { - unsigned idx = seq & JOURNAL_BUF_MASK; - struct journal_buf *buf = j->buf + idx; - - if (buf->need_flush_to_write_buffer) { - union journal_res_state s; - s.v = atomic64_read_acquire(&j->reservations.counter); - - unsigned open = seq == journal_cur_seq(j) && __journal_entry_is_open(s); - - if (open && !*blocked) { - __bch2_journal_block(j); - s.v = atomic64_read_acquire(&j->reservations.counter); - *blocked = true; - } - - ret = journal_state_count(s, idx & JOURNAL_STATE_BUF_MASK) > open - ? ERR_PTR(-EAGAIN) - : buf; - break; - } - } - - spin_unlock(&j->lock); - if (IS_ERR_OR_NULL(ret)) - mutex_unlock(&j->buf_lock); - return ret; -} - -struct journal_buf *bch2_next_write_buffer_flush_journal_buf(struct journal *j, - u64 max_seq, bool *blocked) -{ - struct journal_buf *ret; - *blocked = false; - - wait_event(j->wait, (ret = __bch2_next_write_buffer_flush_journal_buf(j, - max_seq, blocked)) != ERR_PTR(-EAGAIN)); - if (IS_ERR_OR_NULL(ret) && *blocked) - bch2_journal_unblock(j); - - return ret; -} - -/* allocate journal on a device: */ - -static int bch2_set_nr_journal_buckets_iter(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_throw(c, ENOMEM_set_nr_journal_buckets); - goto err_free; - } - - for (nr_got = 0; nr_got < nr_want; nr_got++) { - enum bch_watermark watermark = new_fs - ? BCH_WATERMARK_btree - : BCH_WATERMARK_normal; - - ob[nr_got] = bch2_bucket_alloc(c, ca, watermark, - BCH_DATA_journal, cl); - ret = PTR_ERR_OR_ZERO(ob[nr_got]); - if (ret) - break; - - if (!new_fs) { - ret = bch2_trans_run(c, - bch2_trans_mark_metadata_bucket(trans, ca, - ob[nr_got]->bucket, BCH_DATA_journal, - ca->mi.bucket_size, BTREE_TRIGGER_transactional)); - 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; - - 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, - BTREE_TRIGGER_transactional)); -err_free: - 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; -} - -static int bch2_set_nr_journal_buckets_loop(struct bch_fs *c, struct bch_dev *ca, - unsigned nr, bool new_fs) -{ - struct journal_device *ja = &ca->journal; - int ret = 0; - - struct closure cl; - closure_init_stack(&cl); - - /* don't handle reducing nr of buckets yet: */ - if (nr < ja->nr) - return 0; - - while (!ret && 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: - */ - if (!new_fs) { - 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_iter(ca, nr, new_fs, &cl); - - if (ret == -BCH_ERR_bucket_alloc_blocked || - ret == -BCH_ERR_open_buckets_empty) - ret = 0; /* wait and retry */ - - bch2_disk_reservation_put(c, &disk_res); - bch2_wait_on_allocator(c, &cl); - } - - 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) -{ - down_write(&c->state_lock); - int ret = bch2_set_nr_journal_buckets_loop(c, ca, nr, false); - up_write(&c->state_lock); - - bch_err_fn(c, ret); - return ret; -} - -int bch2_dev_journal_bucket_delete(struct bch_dev *ca, u64 b) -{ - struct bch_fs *c = ca->fs; - struct journal *j = &c->journal; - struct journal_device *ja = &ca->journal; - - guard(mutex)(&c->sb_lock); - unsigned pos; - for (pos = 0; pos < ja->nr; pos++) - if (ja->buckets[pos] == b) - break; - - if (pos == ja->nr) { - bch_err(ca, "journal bucket %llu not found when deleting", b); - return -EINVAL; - } - - u64 *new_buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL);; - if (!new_buckets) - return bch_err_throw(c, ENOMEM_set_nr_journal_buckets); - - memcpy(new_buckets, ja->buckets, ja->nr * sizeof(u64)); - memmove(&new_buckets[pos], - &new_buckets[pos + 1], - (ja->nr - 1 - pos) * sizeof(new_buckets[0])); - - int ret = bch2_journal_buckets_to_sb(c, ca, ja->buckets, ja->nr - 1) ?: - bch2_write_super(c); - if (ret) { - kfree(new_buckets); - return ret; - } - - scoped_guard(spinlock, &j->lock) { - if (pos < ja->discard_idx) - --ja->discard_idx; - if (pos < ja->dirty_idx_ondisk) - --ja->dirty_idx_ondisk; - if (pos < ja->dirty_idx) - --ja->dirty_idx; - if (pos < ja->cur_idx) - --ja->cur_idx; - - ja->nr--; - - memmove(&ja->buckets[pos], - &ja->buckets[pos + 1], - (ja->nr - pos) * sizeof(ja->buckets[0])); - - memmove(&ja->bucket_seq[pos], - &ja->bucket_seq[pos + 1], - (ja->nr - pos) * sizeof(ja->bucket_seq[0])); - - bch2_journal_space_available(j); - } - - kfree(new_buckets); - return 0; -} - -int bch2_dev_journal_alloc(struct bch_dev *ca, bool new_fs) -{ - struct bch_fs *c = ca->fs; - - if (!(ca->mi.data_allowed & BIT(BCH_DATA_journal))) - return 0; - - if (c->sb.features & BIT_ULL(BCH_FEATURE_small_image)) { - bch_err(c, "cannot allocate journal, filesystem is an unresized image file"); - return bch_err_throw(c, erofs_filesystem_full); - } - - unsigned nr; - int ret; - - if (dynamic_fault("bcachefs:add:journal_alloc")) { - ret = bch_err_throw(c, 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_loop(c, ca, nr, new_fs); -err: - bch_err_fn(ca, ret); - return ret; -} - -int bch2_fs_journal_alloc(struct bch_fs *c) -{ - for_each_online_member(c, ca, BCH_DEV_READ_REF_fs_journal_alloc) { - if (ca->journal.nr) - continue; - - int ret = bch2_dev_journal_alloc(ca, true); - if (ret) { - enumerated_ref_put(&ca->io_ref[READ], - BCH_DEV_READ_REF_fs_journal_alloc); - 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) -{ - if (!test_bit(JOURNAL_running, &j->flags)) - return; - - 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); - cancel_delayed_work_sync(&j->write_work); - - WARN(!bch2_journal_error(j) && - test_bit(JOURNAL_replay_done, &j->flags) && - j->last_empty_seq != journal_cur_seq(j), - "journal shutdown error: cur seq %llu but last empty seq %llu", - journal_cur_seq(j), j->last_empty_seq); - - if (!bch2_journal_error(j)) - clear_bit(JOURNAL_running, &j->flags); -} - -int bch2_fs_journal_start(struct journal *j, u64 last_seq, 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; - - /* - * - * XXX pick most recent non blacklisted sequence number - */ - - cur_seq = max(cur_seq, bch2_journal_last_blacklisted_seq(c)); - - if (cur_seq >= JOURNAL_SEQ_MAX) { - bch_err(c, "cannot start: journal seq overflow"); - return -EINVAL; - } - - /* Clean filesystem? */ - if (!last_seq) - last_seq = cur_seq; - - u64 nr = cur_seq - last_seq; - - /* - * Extra fudge factor, in case we crashed when the journal pin fifo was - * nearly or completely full. We'll need to be able to open additional - * journal entries (at least a few) in order for journal replay to get - * going: - */ - nr += nr / 4; - - nr = max(nr, JOURNAL_PIN); - init_fifo(&j->pin, roundup_pow_of_two(nr), GFP_KERNEL); - if (!j->pin.data) { - bch_err(c, "error reallocating journal fifo (%llu open entries)", nr); - return bch_err_throw(c, 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_write_started = 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); - - u64 seq; - 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 (journal_replay_ignore(i)) - 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; - darray_for_each(i->ptrs, ptr) - bch2_dev_list_add_dev(&p->devs, ptr->dev); - - had_entries = true; - } - - if (!had_entries) - j->last_empty_seq = cur_seq - 1; /* to match j->seq */ - - spin_lock(&j->lock); - j->last_flush_write = jiffies; - - j->reservations.idx = journal_cur_seq(j); - - c->last_bucket_seq_cleanup = journal_cur_seq(j); - spin_unlock(&j->lock); - - return 0; -} - -void bch2_journal_set_replay_done(struct journal *j) -{ - /* - * journal_space_available must happen before setting JOURNAL_running - * JOURNAL_running must happen before JOURNAL_replay_done - */ - spin_lock(&j->lock); - bch2_journal_space_available(j); - - set_bit(JOURNAL_need_flush_write, &j->flags); - set_bit(JOURNAL_running, &j->flags); - set_bit(JOURNAL_replay_done, &j->flags); - spin_unlock(&j->lock); -} - -/* init/exit: */ - -void bch2_dev_journal_exit(struct bch_dev *ca) -{ - struct journal_device *ja = &ca->journal; - - for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) { - kfree(ja->bio[i]); - ja->bio[i] = NULL; - } - - kfree(ja->buckets); - kfree(ja->bucket_seq); - ja->buckets = NULL; - ja->bucket_seq = NULL; -} - -int bch2_dev_journal_init(struct bch_dev *ca, struct bch_sb *sb) -{ - struct bch_fs *c = ca->fs; - 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); - - ja->nr = 0; - - if (journal_buckets_v2) { - unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); - - for (unsigned 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_throw(c, ENOMEM_dev_journal_init); - - unsigned nr_bvecs = DIV_ROUND_UP(JOURNAL_ENTRY_SIZE_MAX, PAGE_SIZE); - - for (unsigned i = 0; i < ARRAY_SIZE(ja->bio); i++) { - ja->bio[i] = kzalloc(struct_size(ja->bio[i], bio.bi_inline_vecs, - nr_bvecs), GFP_KERNEL); - if (!ja->bio[i]) - return bch_err_throw(c, ENOMEM_dev_journal_init); - - ja->bio[i]->ca = ca; - ja->bio[i]->buf_idx = i; - bio_init(&ja->bio[i]->bio, NULL, ja->bio[i]->bio.bi_inline_vecs, nr_bvecs, 0); - } - - ja->buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL); - if (!ja->buckets) - return bch_err_throw(c, ENOMEM_dev_journal_init); - - if (journal_buckets_v2) { - unsigned nr = bch2_sb_field_journal_v2_nr_entries(journal_buckets_v2); - unsigned dst = 0; - - for (unsigned i = 0; i < nr; i++) - for (unsigned 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 (unsigned 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) -{ - if (j->wq) - destroy_workqueue(j->wq); - - darray_exit(&j->early_journal_entries); - - for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) - kvfree(j->buf[i].data); - kvfree(j->free_buf); - free_fifo(&j->pin); -} - -void bch2_fs_journal_init_early(struct journal *j) -{ - static struct lock_class_key res_key; - - mutex_init(&j->buf_lock); - 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); -} - -int bch2_fs_journal_init(struct journal *j) -{ - struct bch_fs *c = container_of(j, struct bch_fs, journal); - - j->free_buf_size = j->buf_size_want = JOURNAL_ENTRY_SIZE_MIN; - j->free_buf = kvmalloc(j->free_buf_size, GFP_KERNEL); - if (!j->free_buf) - return bch_err_throw(c, ENOMEM_journal_buf); - - for (unsigned i = 0; i < ARRAY_SIZE(j->buf); i++) - j->buf[i].idx = i; - - j->wq = alloc_workqueue("bcachefs_journal", - WQ_HIGHPRI|WQ_FREEZABLE|WQ_UNBOUND|WQ_MEM_RECLAIM, 512); - if (!j->wq) - return bch_err_throw(c, ENOMEM_fs_other_alloc); - return 0; -} - -/* debug: */ - -static const char * const bch2_journal_flags_strs[] = { -#define x(n) #n, - JOURNAL_FLAGS() -#undef x - NULL -}; - -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; - unsigned long now = jiffies; - u64 nr_writes = j->nr_flush_writes + j->nr_noflush_writes; - - printbuf_tabstops_reset(out); - printbuf_tabstop_push(out, 28); - out->atomic++; - - guard(rcu)(); - s = READ_ONCE(j->reservations); - - prt_printf(out, "flags:\t"); - prt_bitflags(out, bch2_journal_flags_strs, j->flags); - prt_newline(out); - prt_printf(out, "dirty journal entries:\t%llu/%llu\n", fifo_used(&j->pin), j->pin.size); - prt_printf(out, "seq:\t%llu\n", journal_cur_seq(j)); - prt_printf(out, "seq_ondisk:\t%llu\n", j->seq_ondisk); - prt_printf(out, "last_seq:\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%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, "average write size:\t"); - prt_human_readable_u64(out, nr_writes ? div64_u64(j->entry_bytes_written, nr_writes) : 0); - prt_newline(out); - prt_printf(out, "free buf:\t%u\n", j->free_buf ? j->free_buf_size : 0); - 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%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, "blocked:\t%u\n", j->blocked); - prt_printf(out, "current entry sectors:\t%u\n", j->cur_entry_sectors); - prt_printf(out, "current entry error:\t%s\n", bch2_err_str(j->cur_entry_error)); - prt_printf(out, "current entry:\t"); - - switch (s.cur_entry_offset) { - case JOURNAL_ENTRY_ERROR_VAL: - prt_printf(out, "error\n"); - break; - case JOURNAL_ENTRY_CLOSED_VAL: - prt_printf(out, "closed\n"); - break; - case JOURNAL_ENTRY_BLOCKED_VAL: - prt_printf(out, "blocked\n"); - break; - default: - prt_printf(out, "%u/%u\n", s.cur_entry_offset, j->cur_entry_u64s); - break; - } - - prt_printf(out, "unwritten entries:\n"); - bch2_journal_bufs_to_text(out, j); - - prt_printf(out, "space:\n"); - printbuf_indent_add(out, 2); - prt_printf(out, "discarded\t%u:%u\n", - j->space[journal_space_discarded].next_entry, - j->space[journal_space_discarded].total); - prt_printf(out, "clean ondisk\t%u:%u\n", - j->space[journal_space_clean_ondisk].next_entry, - j->space[journal_space_clean_ondisk].total); - prt_printf(out, "clean\t%u:%u\n", - j->space[journal_space_clean].next_entry, - j->space[journal_space_clean].total); - prt_printf(out, "total\t%u:%u\n", - j->space[journal_space_total].next_entry, - j->space[journal_space_total].total); - printbuf_indent_sub(out, 2); - - for_each_member_device_rcu(c, ca, &c->rw_devs[BCH_DATA_journal]) { - if (!ca->mi.durability) - continue; - - 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", ca->dev_idx); - prt_printf(out, "durability %u:\n", ca->mi.durability); - printbuf_indent_add(out, 2); - prt_printf(out, "nr\t%u\n", ja->nr); - prt_printf(out, "bucket size\t%u\n", ca->mi.bucket_size); - prt_printf(out, "available\t%u:%u\n", bch2_journal_dev_buckets_available(j, ja, journal_space_discarded), ja->sectors_free); - prt_printf(out, "discard_idx\t%u\n", ja->discard_idx); - prt_printf(out, "dirty_ondisk\t%u (seq %llu)\n",ja->dirty_idx_ondisk, ja->bucket_seq[ja->dirty_idx_ondisk]); - prt_printf(out, "dirty_idx\t%u (seq %llu)\n", ja->dirty_idx, ja->bucket_seq[ja->dirty_idx]); - prt_printf(out, "cur_idx\t%u (seq %llu)\n", ja->cur_idx, ja->bucket_seq[ja->cur_idx]); - printbuf_indent_sub(out, 2); - } - - prt_printf(out, "replicas want %u need %u\n", c->opts.metadata_replicas, c->opts.metadata_replicas_required); - - --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); -} |