Btrfs-progs: add function to map subvol ID to path

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

diff --git a/cmds-inspect.c b/cmds-inspect.c
index 7761759..30b41fc 100644 (file)
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -24,6 +24,8 @@
 #include "kerncompat.h"
 #include "ioctl.h"
 #include "utils.h"
+#include "ctree.h"
+#include "send-utils.h"
 
 #include "commands.h"
 #include "btrfs-list.h"
@@ -253,12 +255,56 @@ out:
        return ret;
 }
 
+static const char * const cmd_subvolid_resolve_usage[] = {
+       "btrfs inspect-internal subvolid-resolve <subvolid> <path>",
+       "Get file system paths for the given subvolume ID.",
+       NULL
+};
+
+static int cmd_subvolid_resolve(int argc, char **argv)
+{
+       int ret;
+       int fd = -1;
+       u64 subvol_id;
+       char path[BTRFS_PATH_NAME_MAX + 1];
+
+       if (check_argc_exact(argc, 3))
+               usage(cmd_subvolid_resolve_usage);
+
+       fd = open_file_or_dir(argv[2]);
+       if (fd < 0) {
+               fprintf(stderr, "ERROR: can't access '%s'\n", argv[2]);
+               ret = -ENOENT;
+               goto out;
+       }
+
+       subvol_id = atoll(argv[1]);
+       ret = btrfs_subvolid_resolve(fd, path, sizeof(path), subvol_id);
+
+       if (ret) {
+               fprintf(stderr,
+                       "%s: btrfs_subvolid_resolve(subvol_id %llu) failed with ret=%d\n",
+                       argv[0], (unsigned long long)subvol_id, ret);
+               goto out;
+       }
+
+       path[BTRFS_PATH_NAME_MAX] = '\0';
+       printf("%s\n", path);
+
+out:
+       if (fd >= 0)
+               close(fd);
+       return ret ? 1 : 0;
+}
+
 const struct cmd_group inspect_cmd_group = {
        inspect_cmd_group_usage, NULL, {
                { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
                        NULL, 0 },
                { "logical-resolve", cmd_logical_resolve,
                        cmd_logical_resolve_usage, NULL, 0 },
+               { "subvolid-resolve", cmd_subvolid_resolve,
+                       cmd_subvolid_resolve_usage, NULL, 0 },
                { 0, 0, 0, 0, 0 }
        }
 };