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List:       intermezzo-devel
Subject:    Re: [willy@debian.org: [PATCH] Intermezzo should call vfs_permission]
From:       "Yang, Chen" <chyang () clusterfs ! com>
Date:       2004-02-03 16:39:01
Message-ID: 00db01c3ea75$02d01390$4cda96d3 () ccr ! corp ! intel ! com
[Download RAW message or body]

Hi, Matthew:
    I will merge it with the patch posted here to Linus in this week.
    Thanks for your reminder.
--
   Yang, Chen
----- Original Message ----- 
From: "Matthew Wilcox" <willy@debian.org>
To: <intermezzo-devel@lists.sourceforge.net>
Sent: Monday, February 02, 2004 10:23 AM
Subject: [willy@debian.org: [PATCH] Intermezzo should call vfs_permission]


>
> This patch has not yet found its way into Linus' tree.  Can someone
> take care of it?
>
> ----- Forwarded message from Matthew Wilcox <willy@debian.org> -----
>
> Date: Fri, 31 Oct 2003 13:20:24 +0000
> From: Matthew Wilcox <willy@debian.org>
> To: intermezzo-devel@lists.sf.net
> Cc: linux-fsdevel@vger.kernel.org
> Subject: [PATCH] Intermezzo should call vfs_permission
> User-Agent: Mutt/1.4.1i
> Precedence: bulk
> X-Mailing-List: linux-fsdevel@vger.kernel.org
>
>
> This patch fixes some extremely naughty behaviour by intermezzo where it
> overrides a member of an inode's i_op -- which is probably shared between
> all inodes of that filesystem type!  It turns out that the intended
> behaviour is accomplished equally well by just calling vfs_permission().
>
> Index: fs/intermezzo/dir.c
> ===================================================================
> RCS file: /var/cvs/linux-2.6/fs/intermezzo/dir.c,v
> retrieving revision 1.12
> diff -u -p -r1.12 dir.c
> --- a/fs/intermezzo/dir.c 8 Oct 2003 20:52:46 -0000 1.12
> +++ b/fs/intermezzo/dir.c 31 Oct 2003 03:10:01 -0000
> @@ -835,10 +835,9 @@ int presto_permission(struct inode *inod
>  {
>          unsigned short mode = inode->i_mode;
>          struct presto_cache *cache;
> -        int rc;
>
>          ENTRY;
> -        if ( presto_can_ilookup() && !(mask & S_IWOTH)) {
> +        if (presto_can_ilookup() && !(mask & S_IWOTH)) {
>                  CDEBUG(D_CACHE, "ilookup on %ld OK\n", inode->i_ino);
>                  EXIT;
>                  return 0;
> @@ -861,18 +860,8 @@ int presto_permission(struct inode *inod
>                  }
>          }
>
> -        /* The cache filesystem doesn't have its own permission function,
> -         * but we don't want to duplicate the VFS code here.  In order
> -         * to avoid looping from permission calling this function again,
> -         * we temporarily override the permission operation while we call
> -         * the VFS permission function.
> -         */
> -        inode->i_op->permission = NULL;
> -        rc = permission(inode, mask, nd);
> -        inode->i_op->permission = &presto_permission;
> -
>          EXIT;
> -        return rc;
> +        return vfs_permission(inode, mask);
>  }
>
>
>
> -- 
> "It's not Hollywood.  War is real, war is primarily not about defeat or
> victory, it is about death.  I've seen thousands and thousands of dead
bodies.
> Do you think I want to have an academic debate on this subject?" -- Robert
Fisk
> -
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>
> ----- End forwarded message -----
>
> -- 
> "Next the statesmen will invent cheap lies, putting the blame upon
> the nation that is attacked, and every man will be glad of those
> conscience-soothing falsities, and will diligently study them, and refuse
> to examine any refutations of them; and thus he will by and by convince
> himself that the war is just, and will thank God for the better sleep
> he enjoys after this process of grotesque self-deception." -- Mark Twain
>
>
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