bcachefs: Extra debug for data move path

We don't have sufficient information to debug:

https://github.com/koverstreet/bcachefs/issues/726

- print out durability of extent ptrs, when non default
- print the number of replicas we need in data_update_to_text()
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/data_update.c

@@ -475,6 +475,9 @@ void bch2_data_update_opts_to_text(struct printbuf *out, struct bch_fs *c,
 	bch2_compression_opt_to_text(out, background_compression(*io_opts));
 	prt_newline(out);
 
+	prt_str(out, "opts.replicas:\t");
+	prt_u64(out, io_opts->data_replicas);
+
 	prt_str(out, "extra replicas:\t");
 	prt_u64(out, data_opts->extra_replicas);
 }

fs/bcachefs/extents.c

@@ -1017,6 +1017,8 @@ void bch2_extent_ptr_to_text(struct printbuf *out, struct bch_fs *c, const struc
 
 		prt_printf(out, "ptr: %u:%llu:%u gen %u",
 			   ptr->dev, b, offset, ptr->gen);
+		if (ca->mi.durability != 1)
+			prt_printf(out, " d=%u", ca->mi.durability);
 		if (ptr->cached)
 			prt_str(out, " cached");
 		if (ptr->unwritten)