From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1432F9461; Mon, 11 Nov 2024 13:42:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731332549; cv=none; b=kIw1Onc4pW2xNWmbm+uGRJxPPBKOjDkwWF+qxCpf25kwez4ASq6yOKn0rxpjvfLuu8EZK8IqnRZW6a58VduG6//tovTyBQaxlzlT08aXYAsvuHsii7RjEuO5M/5VsErcAkInfN1mIDGS8Hdkm2+hPebgb/vXJBstOYCGsgNGrEE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731332549; c=relaxed/simple; bh=ut+vvT3FzvCooHNaMg7QDWOjzR3vq3uhUdkRXUwmx+0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=dWdkKBtgex+O2mhcLFaqnTqt/RdbOCq0646Y4LxG+d+BvF176th2KhBIrGPd1frXg2WAuXya7DcMv/ERILKC5c7VnLdhdM5/TsIpwg5/5dKOc7/ohjJAFM6+ij/JUVc3LQpuFqwJBYf/AlftJjBOSZ+QmTDxt3soJHZXxmPsfYc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g6VNur4k; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="g6VNur4k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC3C9C4CECF; Mon, 11 Nov 2024 13:42:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731332548; bh=ut+vvT3FzvCooHNaMg7QDWOjzR3vq3uhUdkRXUwmx+0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=g6VNur4kQ6EkUzLt6AbVvaoCA+6OeHOW90r3EdnP6CH8cjCVZw0yleo1OWueao9jZ Opa6XH0S2qo2xXrri/Ld3QczMIItwzlDGlEs3Qu9/9hfEZXAzMgJ9VmGK+girZOAJD d8gTGX1sKV/yHkpKmvGvNwWFt0Hm84cvxWgHh0ew+IHEv7R1fnaB0GwBEdFEhSsr+s f00WFdL7nsqVCZraNeQ8QZIdwUJsMHnsclUlexsjceQUq0ToPmLr/58yv6hrnArwg6 4EcF5oqu3Q0ztUdXekIHlUBVfKmyBfWeri9WTlidVe9rHp1RZROevoKNLRaghdeev/ gtxOD5N10u3LA== Message-ID: <5418c22b64ac0d8d469d8f9725f1b7685e8daa1b.camel@kernel.org> Subject: Re: [PATCH v3 0/2] fs: allow statmount to fetch the subtype and devname From: Jeff Layton To: Christian Brauner , Karel Zak Cc: Miklos Szeredi , Ian Kent , Josef Bacik , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Viro , Jan Kara Date: Mon, 11 Nov 2024 08:42:26 -0500 In-Reply-To: <20241111-ruhezeit-renovieren-d78a10af973f@brauner> References: <20241107-statmount-v3-0-da5b9744c121@kernel.org> <20241111-ruhezeit-renovieren-d78a10af973f@brauner> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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On Mon, 2024-11-11 at 10:17 +0100, Christian Brauner wrote: > On Thu, 07 Nov 2024 16:00:05 -0500, Jeff Layton wrote: > > Meta has some internal logging that scrapes /proc/self/mountinfo today. > > I'd like to convert it to use listmount()/statmount(), so we can do a > > better job of monitoring with containers. We're missing some fields > > though. This patchset adds them. > >=20 > >=20 >=20 > I know Karel has been wanting this for libmount as well. Thanks for > doing this! It would be nice if you could also add some selftests! >=20 (cc'ing Karel) Thanks. We may need to tweak this a bit, based on Miklos' comments about how empty strings are handled now, but it shouldn't be too big a change. I actually have a related question about libmount: glibc doesn't currently provide syscall wrappers for statmount() and listmount(). Would it make sense to have libmount provide those? We could copy the wrappers in tools/testing/selftests/filesystems/statmount/statmount.h to libmount.h. It's error-prone and a pain to roll these yourself, and that would make things simpler until someone is ready to do something for glibc. Another idea might be to start a new userland header file that is just a collection of static inline wrappers for syscalls that aren't packaged in glibc.e.g. pidfd_open also doesn't have glibc bindings, so we could add that there too. > --- >=20 > Applied to the vfs.misc branch of the vfs/vfs.git tree. > Patches in the vfs.misc branch should appear in linux-next soon. >=20 > Please report any outstanding bugs that were missed during review in a > new review to the original patch series allowing us to drop it. >=20 > It's encouraged to provide Acked-bys and Reviewed-bys even though the > patch has now been applied. If possible patch trailers will be updated. >=20 > Note that commit hashes shown below are subject to change due to rebase, > trailer updates or similar. If in doubt, please check the listed branch. >=20 > tree: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git > branch: vfs.misc >=20 > [1/2] fs: add the ability for statmount() to report the fs_subtype > https://git.kernel.org/vfs/vfs/c/ddfdeccd46bd > [2/2] fs: add the ability for statmount() to report the mnt_devname > https://git.kernel.org/vfs/vfs/c/6fb42b3c00cd --=20 Jeff Layton