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bcachefs: Check if stuck in journal_res_get()

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Like how we already do when the allocator seems to be stuck, check if
we're waiting too long for a journal reservation and print some debug
info.

This is specifically to track down
https://github.com/koverstreet/bcachefs/issues/656

which is showing up in userspace where we don't have sysfs/debugfs to
get the journal debug info.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-10-07 16:55:34 -04:00
parent 04b670de28
commit a7e2dd58fb
1 changed files with 13 additions and 0 deletions
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13
fs/bcachefs/journal.c
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@ -603,6 +603,19 @@ int bch2_journal_res_get_slowpath(struct journal *j, struct journal_res *res,
{
int ret;
if (closure_wait_event_timeout(&j->async_wait,
(ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked ||
(flags & JOURNAL_RES_GET_NONBLOCK),
HZ * 10))
return ret;
struct bch_fs *c = container_of(j, struct bch_fs, journal);
struct printbuf buf = PRINTBUF;
bch2_journal_debug_to_text(&buf, j);
bch_err(c, "Journal stuck? Waited for 10 seconds...\n%s",
buf.buf);
printbuf_exit(&buf);
closure_wait_event(&j->async_wait,
(ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked ||
(flags & JOURNAL_RES_GET_NONBLOCK));