linux-ext4 - Re: [PATCH] resize: Do not fail if EXT4_IOC_RESIZE

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Message-ID: <CAOQ4uxj1cz4Kp24orbskngqnn2TwV88s=HSDRa-AcapFGHaNEA@mail.gmail.com>
Date:	Sun, 16 Oct 2011 09:31:47 +0200
From:	Amir Goldstein <amir73il@...il.com>
To:	Lukas Czerner <lczerner@...hat.com>, Theodore Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, xiaoqiangnk@...il.com
Subject: Re: [PATCH] resize: Do not fail if EXT4_IOC_RESIZE_FS ioctl doesn't exist

On Fri, Oct 14, 2011 at 5:49 PM, Lukas Czerner <lczerner@...hat.com> wrote:
> Commit 9f6ba888f027ba4daf57ac61a11a6dce98e42347 added support for new
> online resize ioctl EXT4_IOC_RESIZE_FS. It is also trying to avoid
> failure when this ioctl() is not supported by the kernel however
> it is checking wrong error code (EINVAL).
>
> When the ioctl does not exist, errno is set to ENOTTY, so we should
> check for that, rather than EINVAL which means that ioctl arguments
> are not valid. So change the code to check for ENOTTY and allow
> resize2fs to try to use the old approach. Also add some comments.
>
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>
> Btw I can not find the new kernel code anywhere. It is not in Linus tree,
> it also is not in the github ext4 master, nor dev tree. Where it is then ?

AFAIK, the latest version of the patches is here:
https://github.com/YANGYongqiang/ext4-patch-queue

and I suppose Ted should have it in patchworks as well.

Ted,

Are you planning to merge new online resize for 3.2?

Thanks,
Amir.



> The problem is that the recent released e2fsprogs are broken for all
> kernels. To be more specific, resize2fs is broken for all kernels.
>
>
>  resize/online.c |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
>
> diff --git a/resize/online.c b/resize/online.c
> index 77290c2..1a77839 100644
> --- a/resize/online.c
> +++ b/resize/online.c
> @@ -72,7 +72,12 @@ errcode_t online_resize_fs(ext2_filsys fs, const char *mtpt,
>        }
>
>        if (ioctl(fd, EXT4_IOC_RESIZE_FS, new_size)) {
> -               if (errno != EINVAL) {
> +               /*
> +                * If kernel does not support EXT4_IOC_RESIZE_FS, use the
> +                * old online resize. Note that the old approach does not
> +                * handle >32 bit file systems
> +                */
> +               if (errno != ENOTTY) {
>                        if (errno == EPERM)
>                                com_err(program_name, 0,
>                                _("Permission denied to resize filesystem"));
> --
> 1.7.4.4
>
> --
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