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bcachefs: fix odebug warn and lockdep splat due to on-stack rhashtable

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Guenter Roeck reports a lockdep splat and DEBUG_OBJECTS_WORK related
warning when bch2_copygc_thread() initializes its rhashtable. The
lockdep splat relates to a warning print caused by the fact that the
rhashtable exists on the stack but is not annotated as so. This is
something that could be addressed by INIT_WORK_ONSTACK(), but
rhashtable doesn't expose that control and probably isnt worth the
churn for just one user. Instead, dynamically allocate the
buckets_in_flight structure and avoid the splat that way.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Brian Foster 2023-11-01 09:01:02 -04:00 committed by Kent Overstreet
parent e0fb0dccfd
commit 0e91d3a6d5
1 changed files with 14 additions and 10 deletions
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24
fs/bcachefs/movinggc.c
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@ -305,14 +305,16 @@ static int bch2_copygc_thread(void *arg)
struct moving_context ctxt;
struct bch_move_stats move_stats;
struct io_clock *clock = &c->io_clock[WRITE];
struct buckets_in_flight buckets;
struct buckets_in_flight *buckets;
u64 last, wait;
int ret = 0;
memset(&buckets, 0, sizeof(buckets));
ret = rhashtable_init(&buckets.table, &bch_move_bucket_params);
buckets = kzalloc(sizeof(struct buckets_in_flight), GFP_KERNEL);
if (!buckets)
return -ENOMEM;
ret = rhashtable_init(&buckets->table, &bch_move_bucket_params);
if (ret) {
kfree(buckets);
bch_err_msg(c, ret, "allocating copygc buckets in flight");
return ret;
}
@ -331,12 +333,12 @@ static int bch2_copygc_thread(void *arg)
cond_resched();
if (!c->copy_gc_enabled) {
move_buckets_wait(&ctxt, &buckets, true);
move_buckets_wait(&ctxt, buckets, true);
kthread_wait_freezable(c->copy_gc_enabled);
}
if (unlikely(freezing(current))) {
move_buckets_wait(&ctxt, &buckets, true);
move_buckets_wait(&ctxt, buckets, true);
__refrigerator(false);
continue;
}
@ -347,7 +349,7 @@ static int bch2_copygc_thread(void *arg)
if (wait > clock->max_slop) {
c->copygc_wait_at = last;
c->copygc_wait = last + wait;
move_buckets_wait(&ctxt, &buckets, true);
move_buckets_wait(&ctxt, buckets, true);
trace_and_count(c, copygc_wait, c, wait, last + wait);
bch2_kthread_io_clock_wait(clock, last + wait,
MAX_SCHEDULE_TIMEOUT);
@ -357,7 +359,7 @@ static int bch2_copygc_thread(void *arg)
c->copygc_wait = 0;
c->copygc_running = true;
ret = bch2_copygc(&ctxt, &buckets, &did_work);
ret = bch2_copygc(&ctxt, buckets, &did_work);
c->copygc_running = false;
wake_up(&c->copygc_running_wq);
@ -374,8 +376,10 @@ static int bch2_copygc_thread(void *arg)
}
}
move_buckets_wait(&ctxt, &buckets, true);
rhashtable_destroy(&buckets.table);
move_buckets_wait(&ctxt, buckets, true);
rhashtable_destroy(&buckets->table);
kfree(buckets);
bch2_moving_ctxt_exit(&ctxt);
bch2_move_stats_exit(&move_stats, c);