linux-kernel - Re: [patch 01/13] ecryptfs: add missing lock around notify

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Message-Id: <200804241656.m3OGuxf5012805@agora.fsl.cs.sunysb.edu>
Date:	Thu, 24 Apr 2008 12:56:59 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, dave@...ux.vnet.ibm.com,
	ezk@...sunysb.edu, mhalcrow@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 01/13] ecryptfs: add missing lock around notify_change 

In message <20080424114008.353519557@...redi.hu>, Miklos Szeredi writes:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> Caller of notify_change() need to hold i_mutex.
> 
> Compile tested only.
> 
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
> ---
>  fs/ecryptfs/inode.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> Index: vfs-2.6/fs/ecryptfs/inode.c
> ===================================================================
> --- vfs-2.6.orig/fs/ecryptfs/inode.c	2008-04-02 18:47:17.000000000 +0200
> +++ vfs-2.6/fs/ecryptfs/inode.c	2008-04-02 18:49:18.000000000 +0200
> @@ -908,7 +908,9 @@ static int ecryptfs_setattr(struct dentr
>  	if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
>  		ia->ia_valid &= ~ATTR_MODE;
>  
> +	mutex_lock(&lower_dentry->d_inode->i_mutex);
>  	rc = notify_change(lower_dentry, ia);
> +	mutex_unlock(&lower_dentry->d_inode->i_mutex);
>  out:
>  	fsstack_copy_attr_all(inode, lower_inode, NULL);
>  	return rc;

Mike/Miklos,

Why is this patch part of the r/o bind mount 13-part patchset?  It seems to
me that this could go to akpm/Linus right now (w/o waiting for r/o bind
mount debate to conclude).

Ditto for the next one: [patch 02/13] ecryptfs: clean up (un)lock_parent

Thanks,
Erez.
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