bcachefs: Add open_buckets to sysfs

This is to help debug a rare shutdown deadlock in the allocator code -
the btree code is leaking open_buckets.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/bcachefs/alloc_background.c b/fs/bcachefs/alloc_background.c
index 15f9adf0876a..fc20649b19cf 100644
--- a/fs/bcachefs/alloc_background.c
+++ b/fs/bcachefs/alloc_background.c
@@ -1232,3 +1232,22 @@ void bch2_fs_allocator_background_init(struct bch_fs *c)
 {
 	spin_lock_init(&c->freelist_lock);
 }
+
+void bch2_open_buckets_to_text(struct printbuf *out, struct bch_fs *c)
+{
+	struct open_bucket *ob;
+
+	for (ob = c->open_buckets;
+	     ob < c->open_buckets + ARRAY_SIZE(c->open_buckets);
+	     ob++) {
+		spin_lock(&ob->lock);
+		if (ob->valid && !ob->on_partial_list) {
+			pr_buf(out, "%zu ref %u type %s\n",
+			       ob - c->open_buckets,
+			       atomic_read(&ob->pin),
+			       bch2_data_types[ob->type]);
+		}
+		spin_unlock(&ob->lock);
+	}
+
+}