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 11CC02147EC; Tue, 4 Feb 2025 15:57:41 +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=1738684661; cv=none; b=P+JOT/M+N9QPpg9DMhop/hFapMgMtwjwNNwmC6Oltg61xW0WrT5pJJ3uhccLq9gzi1Dgs8MpFbpeKgQuWemwNdLRIUa2I+vy+WYfxMNnSepxhq/z+12kJr3QHOFB3cr6GQaVuiE1p86YrAOV6fXGKRLg0hhW8CmHEVbYWvosrJ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738684661; c=relaxed/simple; bh=eQlOZvZPbgSCUhVWGUx4Crgu1p4Fu7oVRLR1pf+Ezx0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=TItOQttoBY4vxU9iCJmJR+kZ20dN6xx1uSPYa13RMt4HrBAnLC9Q3p1EPYgkfLP8I9z3x5tFxOxC2BtP9SUUMA4U1vH4GbLdF75pD6HtuFeCqvORoBEkDJqZPRN9jm8tVvgfqWfDzt8XpVU/iVB3uK8d4FG5YUn7F83/RHAZTFI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PH2/Zkne; 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="PH2/Zkne" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 681C8C4CEDF; Tue, 4 Feb 2025 15:57:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738684660; bh=eQlOZvZPbgSCUhVWGUx4Crgu1p4Fu7oVRLR1pf+Ezx0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=PH2/Zknem2E0lq+pI6wtAZ8cQByidWOGRi5TgQ9vY+im1E4+ZC2QK3CkYTRzj7u++ 5druMRYoDOzLBCeMzbJU6+huBFzfxjZwipGUTujXu+GSha54nyXWHLp3eYRV9oaDxb oskmH+GuZJIOtyu02un9JQ7Z3B5JDqTCkdaxXT2d88P9bKeKQ3sOtx8w0OnWD8jN97 om4O6Wiqct20V1wqzpKSZC/pKb6FQ5Q7n78Ho98SKqwV8/4OsxeUOdKJsO8MHchHEI 623nt9oH7YN9w74HFDJu8BfELMd/Y/5BYLh2k4SN+uf8HiF0YNjwrLvwfxoHs43cRe 7SIO7FIKosO8w== Message-ID: <3a139a0cca7772935dbc7e376d19547191143ce5.camel@kernel.org> Subject: Re: [PATCH] statmount: add a new supported_mask field From: Jeff Layton To: Christian Brauner Cc: Alexander Viro , Jan Kara , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 04 Feb 2025 10:57:39 -0500 In-Reply-To: <20250204-vintage-sozusagen-33df0d66bd6c@brauner> References: <20250203-statmount-v1-1-871fa7e61f69@kernel.org> <20250204-stengel-lodern-8e6ce624cf77@brauner> <8d07cfbab7b1d70b6fc381ad065d55773f73d93f.camel@kernel.org> <20250204-vintage-sozusagen-33df0d66bd6c@brauner> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-02-04 at 16:09 +0100, Christian Brauner wrote: > On Tue, Feb 04, 2025 at 07:28:20AM -0500, Jeff Layton wrote: > > On Tue, 2025-02-04 at 12:07 +0100, Christian Brauner wrote: > > > On Mon, Feb 03, 2025 at 12:09:48PM -0500, Jeff Layton wrote: > > > > Some of the fields in the statmount() reply can be optional. If the > > > > kernel has nothing to emit in that field, then it doesn't set the f= lag > > > > in the reply. This presents a problem: There is currently no way to > > > > know what mask flags the kernel supports since you can't always cou= nt on > > > > them being in the reply. > > > >=20 > > > > Add a new STATMOUNT_SUPPORTED_MASK flag and field that the kernel c= an > > > > set in the reply. Userland can use this to determine if the fields = it > > > > requires from the kernel are supported. This also gives us a way to > > > > deprecate fields in the future, if that should become necessary. > > > >=20 > > > > Signed-off-by: Jeff Layton > > > > --- > > > > I ran into this problem recently. We have a variety of kernels runn= ing > > > > that have varying levels of support of statmount(), and I need to b= e > > > > able to fall back to /proc scraping if support for everything isn't > > > > present. This is difficult currently since statmount() doesn't set = the > > > > flag in the return mask if the field is empty. > > > > --- > > > > fs/namespace.c | 18 ++++++++++++++++++ > > > > include/uapi/linux/mount.h | 4 +++- > > > > 2 files changed, 21 insertions(+), 1 deletion(-) > > > >=20 > > > > diff --git a/fs/namespace.c b/fs/namespace.c > > > > index a3ed3f2980cbae6238cda09874e2dac146080eb6..7ec5fc436c4ff300507= c4ed71a757f5d75a4d520 100644 > > > > --- a/fs/namespace.c > > > > +++ b/fs/namespace.c > > > > @@ -5317,6 +5317,21 @@ static int grab_requested_root(struct mnt_na= mespace *ns, struct path *root) > > > > return 0; > > > > } > > > > =20 > > > > +/* This must be updated whenever a new flag is added */ > > > > +#define STATMOUNT_SUPPORTED (STATMOUNT_SB_BASIC | \ > > > > + STATMOUNT_MNT_BASIC | \ > > > > + STATMOUNT_PROPAGATE_FROM | \ > > > > + STATMOUNT_MNT_ROOT | \ > > > > + STATMOUNT_MNT_POINT | \ > > > > + STATMOUNT_FS_TYPE | \ > > > > + STATMOUNT_MNT_NS_ID | \ > > > > + STATMOUNT_MNT_OPTS | \ > > > > + STATMOUNT_FS_SUBTYPE | \ > > > > + STATMOUNT_SB_SOURCE | \ > > > > + STATMOUNT_OPT_ARRAY | \ > > > > + STATMOUNT_OPT_SEC_ARRAY | \ > > > > + STATMOUNT_SUPPORTED_MASK) > > >=20 > > > Hm, do we need a separate bit for STATMOUNT_SUPPORTED_MASK? Afaiu, th= is > > > is more of a convenience thing but then maybe we just do: > > >=20 > > > #define STATMOUNT_SUPPORTED_MASK STATMOUNT_MNT_BASIC > > >=20 > > > and be done with it? > > >=20 > > > Otherwise I think it is worth having support for this. > > >=20 > >=20 > > Are you suggesting that we should just add the ->supported_mask field > > without a declaring a bit for it? If so, how would that work on old > > kernels? You'd never know if you could trust the contents of that field > > since the return mask wouldn't indicate any difference. >=20 > What I didn't realize because I hadn't read carefully enough in your > patch was that STATMOUNT_SUPPORTED_MASK is raised in ->mask and only > then is ->supported_mask filled in. >=20 > My thinking had been that ->supported_mask will simply always be filled > in by the kernel going forward. Which is arguably not ideal but would > work: >=20 > So the kernel guarantees since the introduction of statmount() that when > we copy out to userspace that anything the kernel doesn't know will be > copied back zeroed. So any unknown fields are zero. >=20 > (1) Say userspace passes a struct statmount with ->supported_mask to the > kernel - even if it has put garbage in there or intentionally raised > valid flags in there - the old kernel will copy over this and set it > to zero. >=20 > (2) If you're on a new kernel but pass an old struct the kernel will > fill in ->supported_mask. Imho, that's fine. Userspace simply will > not know about it. >=20 > But we can leave the explicit request in! >=20 I can respin without STATMOUNT_SUPPORTED_MASK. I was thinking it left that part of the return buffer untouched, but if it's zeroed, then that works as well. If you see a supported_mask of 0, you know the kernel didn't fill it in (since it should at least support _something_). That'll need to be carefully documented though. > >=20 > > > > + > > > > static int do_statmount(struct kstatmount *s, u64 mnt_id, u64 mnt_= ns_id, > > > > struct mnt_namespace *ns) > > > > { > > > > @@ -5386,6 +5401,9 @@ static int do_statmount(struct kstatmount *s,= u64 mnt_id, u64 mnt_ns_id, > > > > if (!err && s->mask & STATMOUNT_MNT_NS_ID) > > > > statmount_mnt_ns_id(s, ns); > > > > =20 > > > > + if (!err && s->mask & STATMOUNT_SUPPORTED_MASK) > > > > + s->sm.supported_mask =3D STATMOUNT_SUPPORTED_MASK; > > > > + > > > > if (err) > > > > return err; > > > > =20 > > > > diff --git a/include/uapi/linux/mount.h b/include/uapi/linux/mount.= h > > > > index c07008816acae89cbea3087caf50d537d4e78298..c553dc4ba68407ee38c= 27238e9bdec2ebf5e2457 100644 > > > > --- a/include/uapi/linux/mount.h > > > > +++ b/include/uapi/linux/mount.h > > > > @@ -179,7 +179,8 @@ struct statmount { > > > > __u32 opt_array; /* [str] Array of nul terminated fs options */ > > > > __u32 opt_sec_num; /* Number of security options */ > > > > __u32 opt_sec_array; /* [str] Array of nul terminated security op= tions */ > > > > - __u64 __spare2[46]; > > > > + __u64 supported_mask; /* Mask flags that this kernel supports */ > > > > + __u64 __spare2[45]; > > > > char str[]; /* Variable size part containing strings */ > > > > }; > > > > =20 > > > > @@ -217,6 +218,7 @@ struct mnt_id_req { > > > > #define STATMOUNT_SB_SOURCE 0x00000200U /* Want/got sb_source */ > > > > #define STATMOUNT_OPT_ARRAY 0x00000400U /* Want/got opt_... */ > > > > #define STATMOUNT_OPT_SEC_ARRAY 0x00000800U /* Want/got opt_sec..= . */ > > > > +#define STATMOUNT_SUPPORTED_MASK 0x00001000U /* Want/got supported= mask flags */ > > > > =20 > > > > /* > > > > * Special @mnt_id values that can be passed to listmount > > > >=20 > > > > --- > > > > base-commit: 57c64cb6ddfb6c79a6c3fc2e434303c40f700964 > > > > change-id: 20250203-statmount-f7da9bec0f23 > > > >=20 > > > > Best regards, > > > > --=20 > > > > Jeff Layton > > > >=20 > >=20 > > --=20 > > Jeff Layton --=20 Jeff Layton