From patchwork Wed Jun 21 14:45:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13287427 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 5C39F18C1F; Wed, 21 Jun 2023 14:45:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89BA8C43140; Wed, 21 Jun 2023 14:45:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1687358744; bh=QciNdEX/PyL764MrYn7o3dC/r/b/XxL6Z8WOkZZO2JI=; h=From:To:Subject:Date:In-Reply-To:References:From; b=DW9+xZXPreiGHhWDzQhz3WX3mGR/hoBV4BdoUSGdAv1SFIQY2OlFGsFXe5YTCbCFz BR15LO6X+8VOz4uI3dADGbD0uhm8s2+O+4j7MgHyXZKIB90uQDbsYuepPjRyFF3B0B 2S88vZc4u+0i13yohGMjh5aUO1xiGWGRa8WmDwIn7xIa6Wp2KMcljJfg3hIVIsXtwI PnOnQteXv2+zJ1j2KyYyBXTgj5whBFg1lvMWJyIj6Iu0U45Bl7KlDPY9zxLJTnkEzM WVhRqOkZnv8t+Jqrh38ZBCXmUl4Pasq/CpzYkhAM57nQJPwjZQCbu6T7NzstnyDGUj O9Kd+RU2DNxhA== From: Jeff Layton To: Jeremy Kerr , Arnd Bergmann , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Greg Kroah-Hartman , =?utf-8?q?Arve_Hj=C3=B8nne?= =?utf-8?q?v=C3=A5g?= , Todd Kjos , Martijn Coenen , Joel Fernandes , Christian Brauner , Carlos Llamas , Suren Baghdasaryan , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Brad Warrum , Ritu Agarwal , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Sterba , David Howells , Marc Dionne , Alexander Viro , Ian Kent , Luis de Bethencourt , Salah Triki , "Tigran A. 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De Francesco" , Chen Zhongjin , Zhengchao Shao , Rik van Riel , Jingyu Wang , Hangyu Hua , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org, linux-usb@vger.kernel.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, autofs@vger.kernel.org, linux-mm@kvack.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-efi@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-ntfs-dev@lists.sourceforge.net, ntfs3@lists.linux.dev, ocfs2-devel@oss.oracle.com, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-hardening@vger.kernel.org, reiserfs-devel@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-trace-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH 01/79] fs: add ctime accessors infrastructure Date: Wed, 21 Jun 2023 10:45:06 -0400 Message-ID: <20230621144507.55591-2-jlayton@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230621144507.55591-1-jlayton@kernel.org> References: <20230621144507.55591-1-jlayton@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 struct timespec64 has unused bits in the tv_nsec field that can be used for other purposes. In future patches, we're going to change how the inode->i_ctime is accessed in certain inodes in order to make use of them. In order to do that safely though, we'll need to eradicate raw accesses of the inode->i_ctime field from the kernel. Add new accessor functions for the ctime that we can use to replace them. Signed-off-by: Jeff Layton Reviewed-by: Jan Kara Acked-by: Tom Talpey Reviewed-by: Luis Chamberlain --- fs/inode.c | 16 ++++++++++++++ include/linux/fs.h | 53 +++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 68 insertions(+), 1 deletion(-) diff --git a/fs/inode.c b/fs/inode.c index d37fad91c8da..c005e7328fbb 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2499,6 +2499,22 @@ struct timespec64 current_time(struct inode *inode) } EXPORT_SYMBOL(current_time); +/** + * inode_ctime_set_current - set the ctime to current_time + * @inode: inode + * + * Set the inode->i_ctime to the current value for the inode. Returns + * the current value that was assigned to i_ctime. + */ +struct timespec64 inode_ctime_set_current(struct inode *inode) +{ + struct timespec64 now = current_time(inode); + + inode_set_ctime(inode, now); + return now; +} +EXPORT_SYMBOL(inode_ctime_set_current); + /** * in_group_or_capable - check whether caller is CAP_FSETID privileged * @idmap: idmap of the mount @inode was found from diff --git a/include/linux/fs.h b/include/linux/fs.h index 6867512907d6..9afb30606373 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1474,7 +1474,58 @@ static inline bool fsuidgid_has_mapping(struct super_block *sb, kgid_has_mapping(fs_userns, kgid); } -extern struct timespec64 current_time(struct inode *inode); +struct timespec64 current_time(struct inode *inode); +struct timespec64 inode_ctime_set_current(struct inode *inode); + +/** + * inode_ctime_peek - fetch the current ctime from the inode + * @inode: inode from which to fetch ctime + * + * Grab the current ctime from the inode and return it. + */ +static inline struct timespec64 inode_ctime_peek(const struct inode *inode) +{ + return inode->i_ctime; +} + +/** + * inode_ctime_set - set the ctime in the inode to the given value + * @inode: inode in which to set the ctime + * @ts: timespec value to set the ctime + * + * Set the ctime in @inode to @ts. + */ +static inline struct timespec64 inode_ctime_set(struct inode *inode, struct timespec64 ts) +{ + inode->i_ctime = ts; + return ts; +} + +/** + * inode_ctime_set_sec - set only the tv_sec field in the inode ctime + * @inode: inode in which to set the ctime + * @sec: value to set the tv_sec field + * + * Set the sec field in the ctime. Returns @sec. + */ +static inline time64_t inode_ctime_set_sec(struct inode *inode, time64_t sec) +{ + inode->i_ctime.tv_sec = sec; + return sec; +} + +/** + * inode_ctime_set_nsec - set only the tv_nsec field in the inode ctime + * @inode: inode in which to set the ctime + * @nsec: value to set the tv_nsec field + * + * Set the nsec field in the ctime. Returns @nsec. + */ +static inline long inode_ctime_set_nsec(struct inode *inode, long nsec) +{ + inode->i_ctime.tv_nsec = nsec; + return nsec; +} /* * Snapshotting support.