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From: Al Viro <viro@ZenIV.linux.org.uk>
To: akpm@linux-foundation.org
Cc: linux-fsdevel@vger.kernel.org, mszeredi@suse.cz,
	Valdis.Kletnieks@vt.edu, agruen@suse.de, hch@lst.de,
	hugh.dickins@tiscali.co.uk, matthew@wil.cx
Subject: Re: [patch 20/21] vfs: no "(unreachable)" prefix for SYSVIPC maps in /proc/PID/maps
Date: Mon, 21 Sep 2009 11:04:51 +0100	[thread overview]
Message-ID: <20090921100451.GJ5858@ZenIV.linux.org.uk> (raw)
In-Reply-To: <200909182006.n8IK62Db019767@imap1.linux-foundation.org>

On Fri, Sep 18, 2009 at 01:06:02PM -0700, akpm@linux-foundation.org wrote:
> From: Miklos Szeredi <mszeredi@suse.cz>
> 
> The patch
> 
>   "vfs: fix d_path() for unreachable paths"
> 
> generally changed d_path() to report unreachable paths with a special
> prefix.  This has an effect on /proc/${PID}/maps as well for memory maps
> set up with shmem_file_setup() or hugetlb_file_setup().  These functions
> set up unlinked files under a kernel-private vfsmount.  Since this
> vfsmount is unreachable from userspace, these maps will be reported with
> the "(unreachable)" prefix.
> 
> This is undesirable, because it changes the kernel ABI and might break
> applications for no good reason.

I'd rather see 17, 19 and 20 collapsed...

  reply	other threads:[~2009-09-21 10:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-18 20:06 [patch 20/21] vfs: no "(unreachable)" prefix for SYSVIPC maps in /proc/PID/maps akpm
2009-09-21 10:04 ` Al Viro [this message]
2009-09-21 10:07   ` Al Viro

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