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bcachefs: bch2_journal_noflush_seq()

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Add bch2_journal_noflush_seq(), for telling the journal that entries
before a given sequence number should not be flushes - to be used by an
upcoming allocator optimization.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-12-27 23:51:48 -05:00 committed by Kent Overstreet
parent c7ce813fe4
commit 5b2e599f50
3 changed files with 43 additions and 3 deletions
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38
fs/bcachefs/journal.c
View file

@ -704,6 +704,44 @@ int bch2_journal_flush(struct journal *j)
return bch2_journal_flush_seq(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 = 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 == last_unwritten_seq(j) && !buf->noflush)
goto out;
buf->noflush = true;
}
ret = true;
out:
spin_unlock(&j->lock);
return ret;
}
/* block/unlock the journal: */
void bch2_journal_unblock(struct journal *j)

1
fs/bcachefs/journal.h
View file

@ -475,6 +475,7 @@ void bch2_journal_flush_async(struct journal *, struct closure *);
int bch2_journal_flush_seq(struct journal *, u64);
int bch2_journal_flush(struct journal *);
bool bch2_journal_noflush_seq(struct journal *, u64);
int bch2_journal_meta(struct journal *);
void bch2_journal_halt(struct journal *);

7
fs/bcachefs/journal_io.c
View file

@ -1396,9 +1396,10 @@ void bch2_journal_write(struct closure *cl)
spin_lock(&j->lock);
if (c->sb.features & (1ULL << BCH_FEATURE_journal_no_flush) &&
!w->must_flush &&
(jiffies - j->last_flush_write) < msecs_to_jiffies(c->opts.journal_flush_delay) &&
test_bit(JOURNAL_MAY_SKIP_FLUSH, &j->flags)) {
(w->noflush ||
(!w->must_flush &&
(jiffies - j->last_flush_write) < msecs_to_jiffies(c->opts.journal_flush_delay) &&
test_bit(JOURNAL_MAY_SKIP_FLUSH, &j->flags)))) {
w->noflush = true;
SET_JSET_NO_FLUSH(jset, true);
jset->last_seq = 0;