From: Christoph Hellwig <hch@infradead.org>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>,
linux-fsdevel@vger.kernel.org,
John Johansen <john.johansen@canonical.com>,
James Morris <jmorris@namei.org>,
Mimi Zohar <zohar@linux.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
Stephen Smalley <stephen.smalley.work@gmail.com>,
Casey Schaufler <casey@schaufler-ca.com>,
Arnd Bergmann <arnd@arndb.de>,
Andreas Dilger <adilger.kernel@dilger.ca>,
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
Geoffrey Thomas <geofft@ldpreload.com>,
Mrunal Patel <mpatel@redhat.com>,
Josh Triplett <josh@joshtriplett.org>,
Andy Lutomirski <luto@kernel.org>,
Amir Goldstein <amir73il@gmail.com>,
Miklos Szeredi <miklos@szeredi.hu>, Theodore Tso <tytso@mit.edu>,
Alban Crequy <alban@kinvolk.io>, Tycho Andersen <tycho@tycho.ws>,
David Howells <dhowells@redhat.com>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
Jann Horn <jannh@google.com>,
Seth Forshee <seth.forshee@canonical.com>,
St??phane Graber <stgraber@ubuntu.com>,
Aleksa Sarai <cyphar@cyphar.com>,
Lennart Poettering <lennart@poettering.net>,
"Eric W. Biederman" <ebiederm@xmission.com>,
smbarber@chromium.org, Phil Estes <estesp@gmail.com>,
Serge Hallyn <serge@hallyn.com>,
Kees Cook <keescook@chromium.org>, Todd Kjos <tkjos@google.com>,
Jonathan Corbet <corbet@lwn.net>,
containers@lists.linux-foundation.org,
linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-unionfs@vger.kernel.org,
linux-audit@redhat.com, linux-integrity@vger.kernel.org,
selinux@vger.kernel.org
Subject: Re: [PATCH 01/34] namespace: take lock_mount_hash() directly when changing flags
Date: Sun, 1 Nov 2020 14:41:08 +0000 [thread overview]
Message-ID: <20201101144108.GA23378@infradead.org> (raw)
In-Reply-To: <20201029003252.2128653-2-christian.brauner@ubuntu.com>
> index cebaa3e81794..20ee291a7af4 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -463,7 +463,6 @@ static int mnt_make_readonly(struct mount *mnt)
> {
> int ret = 0;
>
> - lock_mount_hash();
What about adding a lockdep_assert_lock_held in all the functions
that used to take the lock to document the assumptions?
> static int __mnt_unmake_readonly(struct mount *mnt)
> {
> - lock_mount_hash();
> mnt->mnt.mnt_flags &= ~MNT_READONLY;
> - unlock_mount_hash();
> return 0;
This helper is rather pointless now.
> static void set_mount_attributes(struct mount *mnt, unsigned int mnt_flags)
> {
> - lock_mount_hash();
> mnt_flags |= mnt->mnt.mnt_flags & ~MNT_USER_SETTABLE_MASK;
> mnt->mnt.mnt_flags = mnt_flags;
> touch_mnt_namespace(mnt->mnt_ns);
> - unlock_mount_hash();
In linux-next there is an additional notify_mount after the unlock here.
Also while you touch this lock_mount_hash/unlock_mount_hash could be
moved to namespace.c and maked static now.
next prev parent reply other threads:[~2020-11-01 14:41 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-29 0:32 [PATCH 00/34] fs: idmapped mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 01/34] namespace: take lock_mount_hash() directly when changing flags Christian Brauner
2020-11-01 14:41 ` Christoph Hellwig [this message]
2020-11-02 13:33 ` Christian Brauner
2020-10-29 0:32 ` [PATCH 02/34] namespace: only take read lock in do_reconfigure_mnt() Christian Brauner
2020-10-29 0:32 ` [PATCH 03/34] fs: add mount_setattr() Christian Brauner
2020-11-01 14:42 ` Christoph Hellwig
2020-11-02 13:34 ` Christian Brauner
2020-10-29 0:32 ` [PATCH 04/34] tests: add mount_setattr() selftests Christian Brauner
2020-10-29 0:32 ` [PATCH 05/34] fs: introduce MOUNT_ATTR_IDMAP Christian Brauner
2020-11-01 14:45 ` Christoph Hellwig
2020-11-02 13:29 ` Christian Brauner
2020-10-29 0:32 ` [PATCH 06/34] fs: add id translation helpers Christian Brauner
2020-11-01 14:46 ` Christoph Hellwig
2020-11-02 13:25 ` Christian Brauner
2020-10-29 0:32 ` [PATCH 07/34] capability: handle idmapped mounts Christian Brauner
2020-11-01 14:48 ` Christoph Hellwig
2020-11-02 13:23 ` Christian Brauner
2020-10-29 0:32 ` [PATCH 08/34] namei: add idmapped mount aware permission helpers Christian Brauner
2020-10-29 0:32 ` [PATCH 09/34] inode: add idmapped mount aware init and " Christian Brauner
2020-10-29 0:32 ` [PATCH 10/34] attr: handle idmapped mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 11/34] acl: " Christian Brauner
2020-10-29 0:32 ` [PATCH 12/34] xattr: " Christian Brauner
2020-10-29 0:32 ` [PATCH 13/34] selftests: add idmapped mounts xattr selftest Christian Brauner
2020-10-29 0:32 ` [PATCH 14/34] commoncap: handle idmapped mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 15/34] stat: add mapped_generic_fillattr() Christian Brauner
2020-10-29 0:32 ` [PATCH 16/34] namei: handle idmapped mounts in may_*() helpers Christian Brauner
2020-10-29 0:32 ` [PATCH 17/34] namei: introduce struct renamedata Christian Brauner
2020-10-29 0:32 ` [PATCH 18/34] namei: prepare for idmapped mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 19/34] namei: add lookup helpers with idmapped mounts aware permission checking Christian Brauner
2020-10-29 0:32 ` [PATCH 20/34] open: handle idmapped mounts in do_truncate() Christian Brauner
2020-10-29 0:32 ` [PATCH 21/34] open: handle idmapped mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 22/34] af_unix: " Christian Brauner
2020-10-29 0:32 ` [PATCH 23/34] utimes: " Christian Brauner
2020-10-29 0:32 ` [PATCH 24/34] would_dump: " Christian Brauner
2020-10-29 0:32 ` [PATCH 25/34] exec: " Christian Brauner
2020-10-29 0:32 ` [PATCH 26/34] fs: add helpers for idmap mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 27/34] apparmor: handle idmapped mounts Christian Brauner
2020-10-29 0:32 ` [PATCH 28/34] audit: " Christian Brauner
2020-10-29 0:32 ` [PATCH 29/34] ima: " Christian Brauner
2020-10-29 0:32 ` [PATCH 30/34] ext4: support " Christian Brauner
2020-10-29 0:32 ` [PATCH 31/34] expfs: handle " Christian Brauner
2020-10-29 0:32 ` [PATCH 32/34] overlayfs: handle idmapped lower directories Christian Brauner
2020-10-30 11:10 ` Amir Goldstein
2020-10-30 11:52 ` Christian Brauner
2020-10-29 0:32 ` [PATCH 33/34] overlayfs: handle idmapped merged mounts Christian Brauner
2020-10-30 9:57 ` Amir Goldstein
2020-10-29 0:32 ` [PATCH 34/34] fat: handle idmapped mounts Christian Brauner
2020-10-29 2:27 ` [PATCH 00/34] fs: " Dave Chinner
2020-10-29 16:19 ` Christian Brauner
2020-10-29 7:20 ` Sargun Dhillon
2020-10-29 15:47 ` Eric W. Biederman
2020-10-29 15:51 ` Aleksa Sarai
2020-10-29 16:37 ` Eric W. Biederman
2020-10-30 2:18 ` Serge E. Hallyn
2020-10-30 15:07 ` Seth Forshee
2020-10-30 16:03 ` Serge E. Hallyn
2020-11-03 14:10 ` Alban Crequy
2020-10-29 16:05 ` Lennart Poettering
2020-10-29 16:36 ` Sargun Dhillon
2020-10-29 16:54 ` Eric W. Biederman
[not found] ` <20201029161231.GA108315@cisco>
2020-10-29 16:23 ` Serge E. Hallyn
2020-10-29 16:44 ` Eric W. Biederman
2020-10-29 18:04 ` Stéphane Graber
2020-10-29 21:58 ` Andy Lutomirski
2020-10-30 12:01 ` Christian Brauner
2020-10-30 16:17 ` Serge E. Hallyn
2020-10-31 17:43 ` Andy Lutomirski
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