1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 7e175dbc76b0..db2111b88e20 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -400,6 +400,48 @@ static struct attribute *bch_flash_dev_files[] = {
 };
 KTYPE(bch_flash_dev);
 
+struct bset_stats_op {
+        struct btree_op op;
+        size_t nodes;
+        struct bset_stats stats;
+};
+
+static int btree_bset_stats(struct btree_op *b_op, struct btree *b)
+{
+        struct bset_stats_op *op = container_of(b_op, struct bset_stats_op, op);
+
+        op->nodes++;
+        bch_btree_keys_stats(&b->keys, &op->stats);
+
+        return MAP_CONTINUE;
+}
+
+int bch_bset_print_stats(struct cache_set *c, char *buf)
+{
+        struct bset_stats_op op;
+        int ret;
+
+        memset(&op, 0, sizeof(op));
+        bch_btree_op_init(&op.op, -1);
+
+        ret = bch_btree_map_nodes(&op.op, c, &ZERO_KEY, btree_bset_stats);
+        if (ret < 0)
+                return ret;
+
+        return snprintf(buf, PAGE_SIZE,
+                        "btree nodes:           %zu\n"
+                        "written sets:          %zu\n"
+                        "unwritten sets:                %zu\n"
+                        "written key bytes:     %zu\n"
+                        "unwritten key bytes:   %zu\n"
+                        "floats:                        %zu\n"
+                        "failed:                        %zu\n",
+                        op.nodes,
+                        op.stats.sets_written, op.stats.sets_unwritten,
+                        op.stats.bytes_written, op.stats.bytes_unwritten,
+                        op.stats.floats, op.stats.failed);
+}
+
 SHOW(__bch_cache_set)
 {
         unsigned root_usage(struct cache_set *c)