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-rw-r--r--utils.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/utils.c b/utils.c
index cd3234e1..dd2ff9c2 100644
--- a/utils.c
+++ b/utils.c
@@ -3171,3 +3171,76 @@ char *get_subvol_name(char *mnt, char *full_path)
return full_path + len;
}
+
+/*
+ * Returns
+ * <0: Std error
+ * 0: All fine
+ * 1: Error; and error info printed to the terminal. Fixme.
+ * 2: If the fullpath is root tree instead of subvol tree
+ */
+int get_subvol_info(char *fullpath, struct root_info *get_ri)
+{
+ u64 sv_id;
+ int ret = 1;
+ int fd = -1;
+ int mntfd = -1;
+ char *mnt = NULL;
+ char *svpath = NULL;
+ DIR *dirstream1 = NULL;
+ DIR *dirstream2 = NULL;
+
+ ret = test_issubvolume(fullpath);
+ if (ret < 0)
+ return ret;
+ if (!ret) {
+ error("not a subvolume: %s", fullpath);
+ return 1;
+ }
+
+ ret = find_mount_root(fullpath, &mnt);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ error("%s doesn't belong to btrfs mount point", fullpath);
+ return 1;
+ }
+ ret = 1;
+ svpath = get_subvol_name(mnt, fullpath);
+
+ fd = btrfs_open_dir(fullpath, &dirstream1, 1);
+ if (fd < 0)
+ goto out;
+
+ ret = btrfs_list_get_path_rootid(fd, &sv_id);
+ if (ret) {
+ error("can't get rootid for '%s'", fullpath);
+ goto out;
+ }
+
+ mntfd = btrfs_open_dir(mnt, &dirstream2, 1);
+ if (mntfd < 0)
+ goto out;
+
+ if (sv_id == BTRFS_FS_TREE_OBJECTID) {
+ ret = 2;
+ /*
+ * So that caller may decide if thats an error or just fine.
+ */
+ goto out;
+ }
+
+ memset(get_ri, 0, sizeof(*get_ri));
+ get_ri->root_id = sv_id;
+
+ ret = btrfs_get_subvol(mntfd, get_ri);
+ if (ret)
+ error("can't find '%s': %d", svpath, ret);
+
+out:
+ close_file_or_dir(mntfd, dirstream2);
+ close_file_or_dir(mntfd, dirstream1);
+ free(mnt);
+
+ return ret;
+}