linux-kernel - Re: [git pull] VFS patches

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Date:	Tue, 20 May 2008 21:04:38 +0900
From:	hooanon05@...oo.co.jp
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [git pull] VFS patches 


Hello Al,

I have a question about the commit you made last month.
When an application issues sys_oldumount(), ->umount_begin() will not be
called because the flag is 0. Is this behaviour intended?
And it it better to put the paranthesis around (flags & MNT_FORCE).


Junjiro Okajima


Al Viro:
> 	Tonight's pile: getting ->umount_begin() back to sanity, race fixes
> around execve(), general cleanups.  Please, pull from
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6.git/ for-linus
> 
> Shortlog:
> 
> Al Viro (5):
>       restore sane ->umount_begin() API
	:::
> diff --git a/fs/namespace.c b/fs/namespace.c
> index 0505fb6..f48f981 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -1061,10 +1061,11 @@ static int do_umount(struct vfsmount *mnt, int flags)
>  	 * about for the moment.
>  	 */
>  
> -	lock_kernel();
> -	if (sb->s_op->umount_begin)
> -		sb->s_op->umount_begin(mnt, flags);
> -	unlock_kernel();
> +	if (flags & MNT_FORCE && sb->s_op->umount_begin) {
> +		lock_kernel();
> +		sb->s_op->umount_begin(sb);
> +		unlock_kernel();
> +	}
>  
>  	/*
>  	 * No sense to grab the lock for this test, but test itself looks
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