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bcachefs: Fix bch2_journal_noflush_seq()

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Improved journal pipelining broke journal_noflush_seq(); it implicitly
assumed only the oldest outstanding journal buf could be in flight, but
that's no longer true.

Make this more straightforward by just setting buf->must_flush whenever
we know a journal buf is going to be flush.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-02-28 21:56:57 -05:00
parent 79162e829b
commit 7efa287526
2 changed files with 6 additions and 5 deletions
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10
fs/bcachefs/journal.c
View File

@ -716,7 +716,7 @@ recheck_need_open:
return ret;
seq = res.seq;
buf = j->buf + (seq & JOURNAL_BUF_MASK);
buf = journal_seq_to_buf(j, seq);
buf->must_flush = true;
if (!buf->flush_time) {
@ -734,8 +734,8 @@ recheck_need_open:
}
/*
* if write was kicked off without a flush, flush the next sequence
* number instead
* 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) {
@ -813,8 +813,8 @@ bool bch2_journal_noflush_seq(struct journal *j, u64 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)
/* journal flush already in flight, or flush requseted */
if (buf->must_flush)
goto out;
buf->noflush = true;

1
fs/bcachefs/journal_io.c
View File

@ -1936,6 +1936,7 @@ static int bch2_journal_write_pick_flush(struct journal *j, struct journal_buf *
j->nr_noflush_writes++;
} else {
w->must_flush = true;
j->last_flush_write = jiffies;
j->nr_flush_writes++;
clear_bit(JOURNAL_NEED_FLUSH_WRITE, &j->flags);