btrfs-progs: device stats: Print devid instead of null

Print e.g. "[devid:4].write_io_errs   6" instead of
"[(null)].write_io_errs   6" when device is missing.

Signed-off-by: Patrik Lundquist <patrik.lundquist@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/cmds-device.c b/cmds-device.c
index b17b6c6..7616c43 100644 (file)
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -447,6 +447,13 @@ static int cmd_device_stats(int argc, char **argv)
 
                        canonical_path = canonicalize_path((char *)path);
 
+                       /* No path when device is missing. */
+                       if (!canonical_path) {
+                               canonical_path = malloc(32);
+                               snprintf(canonical_path, 32,
+                                        "devid:%llu", args.devid);
+                       }
+
                        if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
                                printf("[%s].write_io_errs   %llu\n",
                                       canonical_path,