Re: [PATCH RFC] NFSD: fix cannot umounting mount points under pseudo root

[Kinglong Mee <kinglongmee@gmail.com>]

ping ....

> -----------------------------------------------------------------------------------
>>From d831154bb7e527f9003e16ac049526be5ed90228 Mon Sep 17 00:00:00 2001
> From: Kinglong Mee <kinglongmee@gmail.com>
> Date: Tue, 5 May 2015 16:24:16 +0800
> Subject: [PATCH] mountd: Case-insensitive path length must equals to parent
> 
> Commit 6091c0a4c4 (mountd: add support for case-insensitive file names)
> introduces looking up bad path which is easy to trigger a present mutex race.
> 
> Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
> ---
>  utils/mountd/cache.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
> index 7d250f9..155695a 100644
> --- a/utils/mountd/cache.c
> +++ b/utils/mountd/cache.c
> @@ -478,7 +478,7 @@ static int is_subdirectory(char *child, char *parent)
>  	if (strcmp(parent, "/") == 0 && child[1] != 0)
>  		return 1;
>  
> -	return (same_path(child, parent, l) && child[l] == '/');
> +	return (child[l] == '/'	&& same_path(child, parent, l));
>  }
>  
>  static int path_matches(nfs_export *exp, char *path)
>