bcachefs: Heap allocate printbufs

This patch changes printbufs dynamically allocate and reallocate a
buffer as needed. Stack usage has become a bit of a problem, and a major
cause of that has been static size string buffers on the stack.

The most involved part of this refactoring is that printbufs must now be
exited with printbuf_exit().

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/bcachefs/clock.c b/fs/bcachefs/clock.c
index da91c95e3ffc..342797303415 100644
--- a/fs/bcachefs/clock.c
+++ b/fs/bcachefs/clock.c
@@ -157,6 +157,7 @@ void bch2_io_timers_to_text(struct printbuf *out, struct io_clock *clock)
 	unsigned long now;
 	unsigned i;
 
+	out->atomic++;
 	spin_lock(&clock->timer_lock);
 	now = atomic64_read(&clock->now);
 
@@ -165,6 +166,7 @@ void bch2_io_timers_to_text(struct printbuf *out, struct io_clock *clock)
 		       clock->timers.data[i]->fn,
 		       clock->timers.data[i]->expire - now);
 	spin_unlock(&clock->timer_lock);
+	--out->atomic;
 }
 
 void bch2_io_clock_exit(struct io_clock *clock)