Re: [Libguestfs] [PATCH 3/5] New API: btrfs_filesystem_get_label

Pino Toscano
Mon, 05 Jan 2015 12:26:08 -0000

In data venerdì 26 dicembre 2014 16:17:47, Hu Tao ha
scritto:
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  daemon/btrfs.c       | 32 ++++++++++++++++++++++++++++++++
>  generator/actions.ml | 15 +++++++++++++++
>  src/MAX_PROC_NR      |  2 +-
>  3 files changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/daemon/btrfs.c b/daemon/btrfs.c
> index de20bc3..6c74892 100644
> --- a/daemon/btrfs.c
> +++ b/daemon/btrfs.c
> @@ -1399,3 +1399,35 @@ do_btrfs_check (const char *device)
>
>    return 0;
>  }
> +
> +char *
> +do_btrfs_filesystem_get_label (const char *path)
> +{
> +  const size_t MAX_ARGS = 64;
> +  const char *argv[MAX_ARGS];
> +  size_t i = 0;
> +  CLEANUP_FREE char *path_buf = NULL;
> +  CLEANUP_FREE char *err = NULL;
> +  char *out;
> +  int r;
> +
> +  path_buf = sysroot_path (path);
> +  if (path_buf == NULL) {
> +    reply_with_perror ("malloc");
> +    return NULL;
> +  }
> +
> +  ADD_ARG (argv, i, str_btrfs);
> +  ADD_ARG (argv, i, "filesystem");
> +  ADD_ARG (argv, i, "label");
> +  ADD_ARG (argv, i, path_buf);
> +  ADD_ARG (argv, i, NULL);
> +
> +  r = commandv (&out, &err, argv);
> +  if (r == -1) {
> +    reply_with_error ("%s: %s", path, err);
> +    return NULL;
> +  }
> +
> +  return out;
> +}

There's vfs_label already as command to get the label of a filesystem,
so this special case for btrfs should be added there (just like the
ones done in set_label).

Isn't blkid working on btrfs filesystems? From what I see, there is
support for it already.

> diff --git a/generator/actions.ml b/generator/actions.ml
> index c328319..5223eb8 100644
> --- a/generator/actions.ml
> +++ b/generator/actions.ml
> @@ -12281,6 +12281,21 @@ corrupt data." };
>      longdesc = "\
>  Check or repair a btrfs filesystem offline." };
>
> +  { defaults with
> +    name = "btrfs_filesystem_get_label";
> +    style = RString "label", [Pathname "path"], [];
> +    proc_nr = Some 437;
> +    optional = Some "btrfs"; camel_name =
"BTRFSFilesystemGetLabel";
> +    tests = [
> +      InitPartition, Always, TestResultString (
> +        [["mkfs_btrfs"; "/dev/sda1"; "";
""; "NOARG"; ""; "label";
"NOARG"; ""; ""];
> +         ["mount"; "/dev/sda1"; "/"];
> +         ["btrfs_filesystem_get_label"; "/";]],
"label\n"), [];
> +    ];

This test bit would be good to be added to the tests of vfs_label,
just with s/Always/IfAvailable "btrfs"/ so it is run only when btrfs
is available.

Thanks,
--
Pino Toscano