linux-kernel - Re: [RFC] cgroup simplify space stripping

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Date:	Thu, 25 Oct 2007 18:14:19 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Paul Jackson" <pj@....com>
Cc:	"Adrian Bunk" <bunk@...nel.org>, linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [RFC] cgroup simplify space stripping

On 10/24/07, Paul Jackson <pj@....com> wrote:
> From: Paul Jackson <pj@....com>
>
> Simplify the space stripping code in cgroup file write.
>
> Signed-off-by: Paul Jackson <pj@....com>

Acked-by: Paul Menage <menage@...gle.com>

>
> ---
>
> This patch applies after both:
>         Adrian Bunk's: [2.6 patch] kernel/cgroup.c: remove dead code
>         pj's: [PATCH] cgroup brace coding style fix
>
>  kernel/cgroup.c |   15 +++------------
>  1 file changed, 3 insertions(+), 12 deletions(-)
>
> --- 2.6.23-mm1.orig/kernel/cgroup.c     2007-10-24 10:03:11.847801501 -0700
> +++ 2.6.23-mm1/kernel/cgroup.c  2007-10-24 10:29:08.355032464 -0700
> @@ -1327,6 +1327,7 @@ static ssize_t cgroup_common_file_write(
>                 goto out1;
>         }
>         buffer[nbytes] = 0;     /* nul-terminate */
> +       strstrip(buffer);       /* strip -just- trailing whitespace */
>
>         mutex_lock(&cgroup_mutex);
>
> @@ -1347,19 +1348,9 @@ static ssize_t cgroup_common_file_write(
>                         clear_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
>                 break;
>         case FILE_RELEASE_AGENT:
> -       {
> -               struct cgroupfs_root *root = cgrp->root;
> -               /* Strip trailing newline */
> -               if (nbytes && (buffer[nbytes-1] == '\n'))
> -                       buffer[nbytes-1] = 0;
> -               /* We never write anything other than '\0'
> -                * into the last char of release_agent_path,
> -                * so it always remains a NUL-terminated
> -                * string */
> -               strncpy(root->release_agent_path, buffer, nbytes);
> -               root->release_agent_path[nbytes] = 0;
> +               BUG_ON(sizeof(cgrp->root->release_agent_path) < PATH_MAX);
> +               strcpy(cgrp->root->release_agent_path, buffer);
>                 break;
> -       }
>         default:
>                 retval = -EINVAL;
>                 goto out2;
>
> --
>                           I won't rest till it's the best ...
>                           Programmer, Linux Scalability
>                           Paul Jackson <pj@....com> 1.650.933.1373
>
-
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