btrfs-progs: Allow inspect dump-tree to show specified tree block even some tree...

[platform/upstream/btrfs-progs.git] / cmds-subvolume.c

diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 674a3a5..666f6e0 100644 (file)
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -891,8 +891,13 @@ static int cmd_subvol_find_new(int argc, char **argv)
 }
 
 static const char * const cmd_subvol_show_usage[] = {
-       "btrfs subvolume show <subvol-path>",
-       "Show more information of the subvolume",
+       "btrfs subvolume show [options] <subvol-path>|<mnt>",
+       "Show more information about the subvolume",
+       "-r|--rootid   rootid of the subvolume",
+       "-u|--uuid     uuid of the subvolume",
+       "",
+       "If no option is specified, <subvol-path> will be shown, otherwise",
+       "the rootid or uuid are resolved relative to the <mnt> path.",
        NULL
 };
 
@@ -907,12 +912,46 @@ static int cmd_subvol_show(int argc, char **argv)
        int fd = -1;
        int ret = 1;
        DIR *dirstream1 = NULL;
+       int by_rootid = 0;
+       int by_uuid = 0;
+       u64 rootid_arg;
+       u8 uuid_arg[BTRFS_UUID_SIZE];
+
+       while (1) {
+               int c;
+               static const struct option long_options[] = {
+                       { "rootid", required_argument, NULL, 'r'},
+                       { "uuid", required_argument, NULL, 'u'},
+                       { NULL, 0, NULL, 0 }
+               };
 
-       clean_args_no_options(argc, argv, cmd_subvol_show_usage);
+               c = getopt_long(argc, argv, "r:u:", long_options, NULL);
+               if (c < 0)
+                       break;
+
+               switch (c) {
+               case 'r':
+                       rootid_arg = arg_strtou64(optarg);
+                       by_rootid = 1;
+                       break;
+               case 'u':
+                       uuid_parse(optarg, uuid_arg);
+                       by_uuid = 1;
+                       break;
+               default:
+                       usage(cmd_subvol_show_usage);
+               }
+       }
 
        if (check_argc_exact(argc - optind, 1))
                usage(cmd_subvol_show_usage);
 
+       if (by_rootid && by_uuid) {
+               error(
+               "options --rootid and --uuid cannot be used at the same time");
+               usage(cmd_subvol_show_usage);
+       }
+
        memset(&get_ri, 0, sizeof(get_ri));
        fullpath = realpath(argv[optind], NULL);
        if (!fullpath) {
@@ -921,7 +960,14 @@ static int cmd_subvol_show(int argc, char **argv)
                goto out;
        }
 
-       ret = get_subvol_info(fullpath, &get_ri);
+       if (by_rootid) {
+               ret = get_subvol_info_by_rootid(fullpath, &get_ri, rootid_arg);
+       } else if (by_uuid) {
+               ret = get_subvol_info_by_uuid(fullpath, &get_ri, uuid_arg);
+       } else {
+               ret = get_subvol_info(fullpath, &get_ri);
+       }
+
        if (ret) {
                if (ret < 0) {
                        error("Failed to get subvol info %s: %s",
@@ -934,7 +980,7 @@ static int cmd_subvol_show(int argc, char **argv)
        }
 
        /* print the info */
-       printf("%s\n", fullpath);
+       printf("%s\n", get_ri.full_path);
        printf("\tName: \t\t\t%s\n", get_ri.name);
 
        if (uuid_is_null(get_ri.uuid))