linux-ext4 - Re: [PATCH] fs: XFS_IOC_FS[SG]SETXATTR to FS_IOC

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Date:	Fri, 29 Jan 2016 23:41:51 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Dave Chinner <david@...morbit.com>, Li Xi <pkuelelixi@...il.com>,
	"open list:OVERLAYFS FILESYSTEM" <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	"open list:KERNEL SELFTEST F..." <linux-api@...r.kernel.org>,
	adilger@...ger.ca, Jan Kara <jack@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>, hch@...radead.org,
	dmonakhov@...nvz.org
Subject: Re: [PATCH] fs: XFS_IOC_FS[SG]SETXATTR to FS_IOC_FS[SG]ETXATTR
 promotion

On Fri, Jan 29, 2016 at 07:56:44PM -0500, Pranith Kumar wrote:
> 
> This commit breaks building latest qemu as follows:

Well, this commit moves where the fsxattr struct is around, but the
header files that gcc is complaining about here:

> In file included from /usr/include/xfs/xfs.h:58:0,
>                  from /home/pranith/qemu/block/raw-posix.c:96:
> /usr/include/xfs/xfs_fs.h:42:8: error: redefinition of ‘struct fsxattr’
>  struct fsxattr {
>         ^
> In file included from /home/pranith/qemu/block/raw-posix.c:59:0:
> /usr/include/linux/fs.h:155:8: note: originally defined here
>  struct fsxattr {
>         ^
> /home/pranith/qemu/rules.mak:57: recipe for target 'block/raw-posix.o' failed

are userspace header files in /usr/include, and so the problem isn't
in the kernel, but how the userspace header files have been set up.

You didn't say what distribution you are using, but I suspect what's
going on is that you are getting /usr/include/xfs/xfs_fs.h from the
xfsprogs package, while the /usr/include/linux/fs.h is getting derived
from the include/uapi/linux/fs.h file from the kernel header files.

So the issue is that these two header files are out of sync.  It's
because of issues like this that I'm not a fan of updating the kernel
header files whenever I install a newer kernel version.

So on my Debain system, I don't update linux-libc-dev when I install a
new upstream kernel built using "make deb-pkg".  I'll still a new
version of the linux-image-*.deb file, and maybe a newer version of
linux-firmware-*.dev, but I don't bother installing the
linux-headers-*.deb file (since I don't compile external kernel
modules), and I don't bother installing linux-libc-dev-*.deb (because
of situations like this, where the userspace include files need ot be
updated in sync, and this should be the distribution's problem to
handle).

Cheers,

						- Ted
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