bcachefs: bch2_fs_accounting_to_text()

Helper to show raw accounting in sysfs, mainly for debugging.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/disk_accounting.c

@@ -308,6 +308,32 @@ int bch2_fs_replicas_usage_read(struct bch_fs *c, darray_char *usage)
 	return ret;
 }
 
+void bch2_fs_accounting_to_text(struct printbuf *out, struct bch_fs *c)
+{
+	struct bch_accounting_mem *acc = &c->accounting[0];
+
+	percpu_down_read(&c->mark_lock);
+	out->atomic++;
+
+	eytzinger0_for_each(i, acc->k.nr) {
+		struct disk_accounting_pos acc_k;
+		bpos_to_disk_accounting_pos(&acc_k, acc->k.data[i].pos);
+
+		bch2_accounting_key_to_text(out, &acc_k);
+
+		u64 v[BCH_ACCOUNTING_MAX_COUNTERS];
+		bch2_accounting_mem_read_counters(c, i, v, ARRAY_SIZE(v), false);
+
+		prt_str(out, ":");
+		for (unsigned j = 0; j < acc->k.data[i].nr_counters; j++)
+			prt_printf(out, " %llu", v[j]);
+		prt_newline(out);
+	}
+
+	--out->atomic;
+	percpu_up_read(&c->mark_lock);
+}
+
 /* Ensures all counters in @src exist in @dst: */
 static int copy_counters(struct bch_accounting_mem *dst,
 			 struct bch_accounting_mem *src)

fs/bcachefs/disk_accounting.h

@@ -193,6 +193,7 @@ static inline void bch2_accounting_mem_read(struct bch_fs *c, struct bpos p,
 }
 
 int bch2_fs_replicas_usage_read(struct bch_fs *, darray_char *);
+void bch2_fs_accounting_to_text(struct printbuf *, struct bch_fs *);
 
 int bch2_accounting_gc_done(struct bch_fs *);
 

fs/bcachefs/sysfs.c

@@ -203,6 +203,7 @@ read_attribute(disk_groups);
 
 read_attribute(has_data);
 read_attribute(alloc_debug);
+read_attribute(accounting);
 
 #define x(t, n, ...) read_attribute(t);
 BCH_PERSISTENT_COUNTERS()
@@ -388,6 +389,9 @@ SHOW(bch2_fs)
 	if (attr == &sysfs_alloc_debug)
 		bch2_fs_alloc_debug_to_text(out, c);
 
+	if (attr == &sysfs_accounting)
+		bch2_fs_accounting_to_text(out, c);
+
 	return 0;
 }
 
@@ -601,6 +605,7 @@ struct attribute *bch2_fs_internal_files[] = {
 
 	&sysfs_disk_groups,
 	&sysfs_alloc_debug,
+	&sysfs_accounting,
 	NULL
 };