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bcachefs: Fix for journal getting stuck

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The journal can get stuck if we need to get a journal reservation for
something we have a pre-reservation for, but aren't able to reclaim
space, or if the pin fifo is full - it's impractical to resize the pin
fifo at runtime.

Previously, we reserved 8 entries in the pin fifo for pre-reservations,
but that seems small - we're seeing the journal occasionally get stuck.
Let's reserve a quarter of it.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2022-02-23 10:26:10 -05:00 committed by Kent Overstreet
parent 6e44568cc3
commit e201f70b11
2 changed files with 2 additions and 2 deletions
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2
fs/bcachefs/journal.c
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@ -416,7 +416,7 @@ static int __journal_res_get(struct journal *j, struct journal_res *res,
(flags & JOURNAL_RES_GET_RESERVED)) {
char *journal_debug_buf = kmalloc(4096, GFP_ATOMIC);
bch_err(c, "Journal stuck!");
bch_err(c, "Journal stuck! Hava a pre-reservation but journal full");
if (journal_debug_buf) {
bch2_journal_debug_to_text(&_PBUF(journal_debug_buf, 4096), j);
bch_err(c, "%s", journal_debug_buf);

2
fs/bcachefs/journal.h
View file

@ -372,7 +372,7 @@ static inline bool journal_check_may_get_unreserved(struct journal *j)
{
union journal_preres_state s = READ_ONCE(j->prereserved);
bool ret = s.reserved < s.remaining &&
fifo_free(&j->pin) > 8;
fifo_free(&j->pin) > j->pin.size / 4;
lockdep_assert_held(&j->lock);