+++ /dev/null
-// 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 "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);
-
- trace_journal_entry_close(c, vstruct_bytes(buf->data));
-
- 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;
- buf->need_flush_to_write_buffer = true;
-
- 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);
-
- 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) {
- track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight],
- &j->max_in_flight_start, true);
- trace_and_count(c, journal_entry_full, c);
- }
-unlock:
- 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);
-}
-
-static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct journal *j, u64 max_seq)
-{
- struct journal_buf *ret = NULL;
-
- 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) {
- if (seq == journal_cur_seq(j))
- __journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
-
- union journal_res_state s;
- s.v = atomic64_read_acquire(&j->reservations.counter);
-
- ret = journal_state_count(s, idx)
- ? 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)
-{
- struct journal_buf *ret;
-
- wait_event(j->wait, (ret = __bch2_next_write_buffer_flush_journal_buf(j, max_seq)) != ERR_PTR(-EAGAIN));
- return ret;
-}
-
-/* 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;
- }
-
- 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:
- bch_err_fn(ca, ret);
- return ret;
-}
-
-int bch2_fs_journal_alloc(struct bch_fs *c)
-{
- for_each_online_member(c, ca) {
- 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;
-
- 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);
-
- 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;
- unsigned long now = jiffies;
- u64 nr_writes = j->nr_flush_writes + j->nr_noflush_writes;
-
- 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, "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, "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 (u64 seq = journal_cur_seq(j);
- seq >= journal_last_unwritten_seq(j);
- --seq) {
- unsigned 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(c, ca, &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", ca->dev_idx);
- 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++;
-}
projects / bcachefs-tools-debian / blobdiff