linux-ext4 - Re: [PATCH] ext4/033: test EXT4_IOC_RESIZE

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Date:   Wed, 5 Jan 2022 15:02:58 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     guan@...u.me, fstests@...r.kernel.org,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Eric Whitney <enwlinux@...il.com>
Subject: Re: [PATCH] ext4/033: test EXT4_IOC_RESIZE_FS by calling the ioctl
 directly

On Thu, Jan 06, 2022 at 12:06:19AM +0800, Zorro Lang wrote:
> > This patch looks good to me, I just want to ask if we'd better to try to include
> > ext2fs/ext2fs.h at here? And of course, check it in configure.ac.
> > The EXT4_IOC_RESIZE_FS looks like defined in ext2fs/ext2_fs.h which comes from
> > e2fsprogs-devel package. I can't find this definition from kernel-hearders package.
> > As you're the expert of this part, please correct me if it's wrong :)

We're not depending on ext2fs/ext2_fs.h and hence the e2fsprogs-devel
(or libext2fs-dev package if you're using Debian/Ubuntu) anywhere else
in the xfstests-dev.  It's not like the code points for
EXT4_IOC_RESIZE_FS are going to change, so we just use constructs
like:

#ifndef EXT4_IOC_RESIZE_FS
#define EXT4_IOC_RESIZE_FS           _IOW('f', 16, __u64)
#endif

in xfstests-dev/src/*.c as needed.

There's no real upside in adding a dependency which makes it harder
for developers to compile xfstests.  (Trivia note: I created
xfstests-bld several years ago because back then, Debian didn't
include some of the internal header files from xfsprogs which xfstests
needed.)

Cheers,

						- Ted