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bcachefs: Fix "journal stuck" during recovery

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If we crash when the journal pin fifo is completely full - i.e. we're
at the maximum number of dirty journal entries - that may put us in a
sticky situation in recovery, as journal replay will need to be able to
open new journal entries in order to get going.

bch2_fs_journal_start() already had provisions for resizing the journal
pin fifo if needed, but it needs a fudge factor to ensure there's room
for journal replay.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-04-02 12:23:25 -04:00
parent 2581f89ac8
commit 77ad1df82b
1 changed files with 8 additions and 0 deletions
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8
fs/bcachefs/journal.c
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@ -1404,6 +1404,14 @@ int bch2_fs_journal_start(struct journal *j, u64 cur_seq)
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;
if (nr + 1 > j->pin.size) {
free_fifo(&j->pin);
init_fifo(&j->pin, roundup_pow_of_two(nr + 1), GFP_KERNEL);