bcachefs: bch2_btree_reserve_cache_to_text()

Add a pretty printer so the btree reserve cache can be seen in sysfs; as
it pins open_buckets we need it for tracking down open_buckets issues.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc_foreground.c

@@ -1589,7 +1589,7 @@ void bch2_fs_allocator_foreground_init(struct bch_fs *c)
 	}
 }
 
-static void bch2_open_bucket_to_text(struct printbuf *out, struct bch_fs *c, struct open_bucket *ob)
+void bch2_open_bucket_to_text(struct printbuf *out, struct bch_fs *c, struct open_bucket *ob)
 {
 	struct bch_dev *ca = ob_dev(c, ob);
 	unsigned data_type = ob->data_type;

fs/bcachefs/alloc_foreground.h

@@ -222,6 +222,7 @@ static inline struct write_point_specifier writepoint_ptr(struct write_point *wp
 
 void bch2_fs_allocator_foreground_init(struct bch_fs *);
 
+void bch2_open_bucket_to_text(struct printbuf *, struct bch_fs *, struct open_bucket *);
 void bch2_open_buckets_to_text(struct printbuf *, struct bch_fs *);
 void bch2_open_buckets_partial_to_text(struct printbuf *, struct bch_fs *);
 

fs/bcachefs/btree_update_interior.c

@@ -2647,6 +2647,28 @@ bch2_btree_roots_to_journal_entries(struct bch_fs *c,
 	return end;
 }
 
+static void bch2_btree_alloc_to_text(struct printbuf *out,
+				     struct bch_fs *c,
+				     struct btree_alloc *a)
+{
+	printbuf_indent_add(out, 2);
+	bch2_bkey_val_to_text(out, c, bkey_i_to_s_c(&a->k));
+	prt_newline(out);
+
+	struct open_bucket *ob;
+	unsigned i;
+	open_bucket_for_each(c, &a->ob, ob, i)
+		bch2_open_bucket_to_text(out, c, ob);
+
+	printbuf_indent_sub(out, 2);
+}
+
+void bch2_btree_reserve_cache_to_text(struct printbuf *out, struct bch_fs *c)
+{
+	for (unsigned i = 0; i < c->btree_reserve_cache_nr; i++)
+		bch2_btree_alloc_to_text(out, c, &c->btree_reserve_cache[i]);
+}
+
 void bch2_fs_btree_interior_update_exit(struct bch_fs *c)
 {
 	if (c->btree_node_rewrite_worker)

fs/bcachefs/btree_update_interior.h

@@ -335,6 +335,8 @@ struct jset_entry *bch2_btree_roots_to_journal_entries(struct bch_fs *,
 void bch2_do_pending_node_rewrites(struct bch_fs *);
 void bch2_free_pending_node_rewrites(struct bch_fs *);
 
+void bch2_btree_reserve_cache_to_text(struct printbuf *, struct bch_fs *);
+
 void bch2_fs_btree_interior_update_exit(struct bch_fs *);
 void bch2_fs_btree_interior_update_init_early(struct bch_fs *);
 int bch2_fs_btree_interior_update_init(struct bch_fs *);

fs/bcachefs/sysfs.c

@@ -17,6 +17,7 @@
 #include "btree_iter.h"
 #include "btree_key_cache.h"
 #include "btree_update.h"
+#include "btree_update_interior.h"
 #include "btree_gc.h"
 #include "buckets.h"
 #include "clock.h"
@@ -170,6 +171,7 @@ read_attribute(compression_stats);
 read_attribute(journal_debug);
 read_attribute(btree_cache);
 read_attribute(btree_key_cache);
+read_attribute(btree_reserve_cache);
 read_attribute(stripes_heap);
 read_attribute(open_buckets);
 read_attribute(open_buckets_partial);
@@ -390,6 +392,9 @@ SHOW(bch2_fs)
 	if (attr == &sysfs_btree_key_cache)
 		bch2_btree_key_cache_to_text(out, &c->btree_key_cache);
 
+	if (attr == &sysfs_btree_reserve_cache)
+		bch2_btree_reserve_cache_to_text(out, c);
+
 	if (attr == &sysfs_stripes_heap)
 		bch2_stripes_heap_to_text(out, c);
 
@@ -607,6 +612,7 @@ struct attribute *bch2_fs_internal_files[] = {
 	&sysfs_journal_debug,
 	&sysfs_btree_cache,
 	&sysfs_btree_key_cache,
+	&sysfs_btree_reserve_cache,
 	&sysfs_new_stripes,
 	&sysfs_stripes_heap,
 	&sysfs_open_buckets,