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[80.187.86.54]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c5095b23afdsm74417566b.13.2026.11.13.02.02.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Nov 2026 02:02:38 -0800 (PST) Message-ID: <8c51aa1ad231dea30af06ecf761a971f5958d063.camel@amutable.com> Subject: Re: [PATCH RFC 05/41] kernfs: use fc_init_pseudo() From: Alexander Mikhalitsyn To: Christian Brauner , linux-fsdevel@vger.kernel.org Cc: Jann Horn , Chris Mason , Josef Bacik , Christoph Hellwig , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Alexander Viro , Jan Kara , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, driver-core@lists.linux.dev, linux-mm@kvack.org, bpf@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, apparmor@lists.ubuntu.com, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, fuse-devel@lists.linux.dev, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org, ocfs2-devel@lists.linux.dev, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-usb@vger.kernel.org, Amir Goldstein , linux-erofs@lists.ozlabs.org, linux-kselftest@vger.kernel.org Date: Fri, 13 Nov 2026 11:02:36 +0100 In-Reply-To: <20261110-work-loop-pseudo-v1-5-4c998976c6c7@kernel.org> References: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> <20261110-work-loop-pseudo-v1-5-4c998976c6c7@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-0+deb13u1 X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Tue, 2026-11-10 at 10:14 +0100, Christian Brauner wrote: > Initialize all kernfs based filesystems as pseudo filesystems in > kernfs_get_tree() instead of raising SB_I_NOEXEC and SB_I_NODEV by > hand > in kernfs_fill_super(). This adds SB_I_PSEUDO for sysfs, cgroupfs and > resctrl. >=20 > Signed-off-by: Christian Brauner (Amutable) Reviewed-by: Alexander Mikhalitsyn > --- > =C2=A0fs/kernfs/mount.c | 4 ++-- > =C2=A01 file changed, 2 insertions(+), 2 deletions(-) >=20 > diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c > index a0be784bfb06..6b60d212b003 100644 > --- a/fs/kernfs/mount.c > +++ b/fs/kernfs/mount.c > @@ -8,6 +8,7 @@ > =C2=A0 */ > =C2=A0 > =C2=A0#include > +#include > =C2=A0#include > =C2=A0#include > =C2=A0#include > @@ -298,8 +299,6 @@ static int kernfs_fill_super(struct super_block > *sb, struct kernfs_fs_context *k > =C2=A0 struct dentry *root; > =C2=A0 > =C2=A0 info->sb =3D sb; > - /* Userspace would break if executables or devices appear on > sysfs */ > - sb->s_iflags |=3D SB_I_NOEXEC | SB_I_NODEV; > =C2=A0 sb->s_blocksize =3D PAGE_SIZE; > =C2=A0 sb->s_blocksize_bits =3D PAGE_SHIFT; > =C2=A0 sb->s_magic =3D kfc->magic; > @@ -388,6 +387,7 @@ int kernfs_get_tree(struct fs_context *fc) > =C2=A0 info->ns =3D kfc->ns_tag; > =C2=A0 INIT_LIST_HEAD(&info->node); > =C2=A0 > + fc_init_pseudo(fc); > =C2=A0 fc->s_fs_info =3D info; > =C2=A0 sb =3D sget_fc(fc, kernfs_test_super, kernfs_set_super); > =C2=A0 if (IS_ERR(sb))