Re: [Libguestfs] [PATCH 4/5] New API: add btrfs_filesystem_defragment

Pino Toscano
Tue, 13 Jan 2015 13:00:13 -0000

On Friday 26 December 2014 16:17:48 Hu Tao wrote:
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  daemon/btrfs.c       | 32 ++++++++++++++++++++++++++++++++
>  generator/actions.ml | 20 ++++++++++++++++++++
>  src/MAX_PROC_NR      |  2 +-
>  3 files changed, 53 insertions(+), 1 deletion(-)
>
> diff --git a/daemon/btrfs.c b/daemon/btrfs.c
> index 6c74892..32b1b05 100644
> --- a/daemon/btrfs.c
> +++ b/daemon/btrfs.c
> @@ -1431,3 +1431,35 @@ do_btrfs_filesystem_get_label (const char *path)
>
>    return out;
>  }
> +
> +int
> +do_btrfs_filesystem_defragment (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;
> +  CLEANUP_FREE char *out = NULL;
> +  int r;
> +
> +  path_buf = sysroot_path (path);
> +  if (path_buf == NULL) {
> +    reply_with_perror ("malloc");
> +    return -1;
> +  }
> +
> +  ADD_ARG (argv, i, str_btrfs);
> +  ADD_ARG (argv, i, "filesystem");
> +  ADD_ARG (argv, i, "defragment");
> +  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 -1;
> +  }
> +
> +  return 0;
> +}

Generally this sounds fine for me.

It seems that directories are not recursively handled by default
(-r is needed); should btrfs_filesystem_defragment do that
automatically?

What about the options like -f (to flush) and -c (to compress), are
they options which get used often/usually, and thus worthy to be
passed as optargs?

> diff --git a/generator/actions.ml b/generator/actions.ml
> index 5223eb8..4b24f8a 100644
> --- a/generator/actions.ml
> +++ b/generator/actions.ml
> @@ -12296,6 +12296,26 @@ Check or repair a btrfs filesystem offline."
};
>      longdesc = "\
>  Get a btrfs filesystem's label." };
>
> +  { defaults with
> +    name = "btrfs_filesystem_defragment";
> +    style = RErr, [Pathname "path"], [];
> +    proc_nr = Some 438;
> +    optional = Some "btrfs"; camel_name =
"BTRFSFilesystemDefragment";
> +    tests = [
> +      InitPartition, Always, TestRun (
> +        [["mkfs_btrfs"; "/dev/sda1"; "";
""; "NOARG"; ""; "NOARG";
"NOARG"; ""; ""];
> +         ["mount"; "/dev/sda1"; "/"];
> +         ["btrfs_filesystem_defragment"; "/"]]), [];
> +      InitPartition, Always, TestRun (
> +        [["mkfs_btrfs"; "/dev/sda1"; "";
""; "NOARG"; ""; "NOARG";
"NOARG"; ""; ""];
> +         ["mount"; "/dev/sda1"; "/"];
> +         ["touch"; "/hello"];
> +         ["btrfs_filesystem_defragment"; "/hello"]]),
[];
> +    ];
> +    shortdesc = "defragment a file or directory";
> +    longdesc = "\
> +Defragment a file or directory." };

Maybe it would be worth mentioning btrfs in the descriptions.

--
Pino Toscano