linux-kernel - Re: FIGETBSZ ioctl conflict

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Date:	Mon, 14 Jun 2010 09:42:52 -0400
From:	tytso@....edu
To:	Johannes Stezenbach <js@...21.net>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: FIGETBSZ ioctl conflict

On Mon, Jun 14, 2010 at 02:36:52PM +0200, Johannes Stezenbach wrote:
> (forgot to add lkml to Cc)
> 
> On Mon, Jun 14, 2010 at 01:02:52PM +0200, Johannes Stezenbach wrote:
> > Hi,
> > 
> > in commit 19ba0559 the FIGETBSZ (and FS_IOC_FIEMAP) ioctl was moved
> > from file_ioctl() to do_vfs_ioctl(), so it also works for directories.
> > The problem I'm seeing is that FIGETBSZ is defined as _IO(0x00,2)
> > which is simply 2.  so there is some potential for conflicts
> > with character devices which do not use the _IO macros for numbering
> > their ioctls.
> > Just doing a web search for "FIGETBSZ ioctl conflict" shows
> > that a few people already ran into this problem.
> > 
> > Would you mind adding a check for S_ISDIR | S_ISREG,
> > or maybe !S_ISCHR?

Yeah, I think the right thing to do here is a check for 
S_ISDIR | S_ISREG | S_ISLNK.

						- Ted
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