From patchwork Wed Jul 5 18:58:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13302706 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFECBC00528 for ; Wed, 5 Jul 2023 18:59:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231776AbjGES7H (ORCPT ); Wed, 5 Jul 2023 14:59:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233179AbjGES65 (ORCPT ); Wed, 5 Jul 2023 14:58:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 291511BC0; Wed, 5 Jul 2023 11:58:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 32DDF616DB; Wed, 5 Jul 2023 18:58:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 048E0C433BB; Wed, 5 Jul 2023 18:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688583530; bh=rS7mHrqZmoO2H68n3RxhES3IzDPLPysS3UyH3PinCQ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aMKB7Eajzv0HN0RjiqoVKTtlq5KN/eWgB5BWIXdR4yS+qXLo9oJ2A8CvARGhR38SH AGVvIkEZAbD+2gqh1hM5AgL3ExspR2noywBNBHZ/Zbz6Jipv98b24C+FbaNuj7Id30 /vjMmqLNAVgc3TMo2RGbDruAikPadReZuK3KcfWQJbROt+tSH7hONNDFEXZgGO8FCp rZUVAJaTqC0bKLSAziTq7i3tC8AVeG/+sFMf01eIn4wnADMCMY5hp3fCv+if/Zhei+ dNlf5J971crJund4f35sQB+fqWVZ1Rv/WEt2CJNhYXge8soEVT4A/D9IhrSNkZ2pHG dVcbUJJd2L7+A== From: Jeff Layton To: jk@ozlabs.org, arnd@arndb.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, gregkh@linuxfoundation.org, arve@android.com, tkjos@android.com, maco@android.com, joel@joelfernandes.org, brauner@kernel.org, cmllamas@google.com, surenb@google.com, dennis.dalessandro@cornelisnetworks.com, jgg@ziepe.ca, leon@kernel.org, bwarrum@linux.ibm.com, rituagar@linux.ibm.com, ericvh@kernel.org, lucho@ionkov.net, asmadeus@codewreck.org, linux_oss@crudebyte.com, dsterba@suse.com, dhowells@redhat.com, marc.dionne@auristor.com, viro@zeniv.linux.org.uk, raven@themaw.net, luisbg@kernel.org, salah.triki@gmail.com, aivazian.tigran@gmail.com, ebiederm@xmission.com, keescook@chromium.org, clm@fb.com, josef@toxicpanda.com, xiubli@redhat.com, idryomov@gmail.com, jlayton@kernel.org, jaharkes@cs.cmu.edu, coda@cs.cmu.edu, jlbec@evilplan.org, hch@lst.de, nico@fluxnic.net, rafael@kernel.org, code@tyhicks.com, ardb@kernel.org, xiang@kernel.org, chao@kernel.org, huyue2@coolpad.com, jefflexu@linux.alibaba.com, linkinjeon@kernel.org, sj1557.seo@samsung.com, jack@suse.com, tytso@mit.edu, adilger.kernel@dilger.ca, jaegeuk@kernel.org, hirofumi@mail.parknet.co.jp, miklos@szeredi.hu, rpeterso@redhat.com, agruenba@redhat.com, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, mikulas@artax.karlin.mff.cuni.cz, mike.kravetz@oracle.com, muchun.song@linux.dev, dwmw2@infradead.org, shaggy@kernel.org, tj@kernel.org, trond.myklebust@hammerspace.com, anna@kernel.org, chuck.lever@oracle.com, neilb@suse.de, kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com, konishi.ryusuke@gmail.com, anton@tuxera.com, almaz.alexandrovich@paragon-software.com, mark@fasheh.com, joseph.qi@linux.alibaba.com, me@bobcopeland.com, hubcap@omnibond.com, martin@omnibond.com, amir73il@gmail.com, mcgrof@kernel.org, yzaikin@google.com, tony.luck@intel.com, gpiccoli@igalia.com, al@alarsen.net, sfrench@samba.org, pc@manguebit.com, lsahlber@redhat.com, sprasad@microsoft.com, senozhatsky@chromium.org, phillip@squashfs.org.uk, rostedt@goodmis.org, mhiramat@kernel.org, dushistov@mail.ru, hdegoede@redhat.com, djwong@kernel.org, dlemoal@kernel.org, naohiro.aota@wdc.com, jth@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, hughd@google.com, akpm@linux-foundation.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, stephen.smalley.work@gmail.com, eparis@parisplace.org, jgross@suse.com, stern@rowland.harvard.edu, lrh2000@pku.edu.cn, sebastian.reichel@collabora.com, wsa+renesas@sang-engineering.com, quic_ugoswami@quicinc.com, quic_linyyuan@quicinc.com, john@keeping.me.uk, error27@gmail.com, quic_uaggarwa@quicinc.com, hayama@lineo.co.jp, jomajm@gmail.com, axboe@kernel.dk, dhavale@google.com, dchinner@redhat.com, hannes@cmpxchg.org, zhangpeng362@huawei.com, slava@dubeyko.com, gargaditya08@live.com, penguin-kernel@I-love.SAKURA.ne.jp, yifeliu@cs.stonybrook.edu, madkar@cs.stonybrook.edu, ezk@cs.stonybrook.edu, yuzhe@nfschina.com, willy@infradead.org, okanatov@gmail.com, jeffxu@chromium.org, linux@treblig.org, mirimmad17@gmail.com, yijiangshan@kylinos.cn, yang.yang29@zte.com.cn, xu.xin16@zte.com.cn, chengzhihao1@huawei.com, shr@devkernel.io, Liam.Howlett@Oracle.com, adobriyan@gmail.com, chi.minghao@zte.com.cn, roberto.sassu@huawei.com, linuszeng@tencent.com, bvanassche@acm.org, zohar@linux.ibm.com, yi.zhang@huawei.com, trix@redhat.com, fmdefrancesco@gmail.com, ebiggers@google.com, princekumarmaurya06@gmail.com, chenzhongjin@huawei.com, riel@surriel.com, shaozhengchao@huawei.com, jingyuwang_vip@163.com, 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@lists.linux.dev, 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 Cc: Jan Kara Subject: [PATCH v2 07/92] fs: add ctime accessors infrastructure Date: Wed, 5 Jul 2023 14:58:10 -0400 Message-ID: <20230705185812.579118-2-jlayton@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230705185812.579118-1-jlayton@kernel.org> References: <20230705185812.579118-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org 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 use to replace them. Reviewed-by: Jan Kara Reviewed-by: Luis Chamberlain Signed-off-by: Jeff Layton Reviewed-by: Damien Le Moal --- fs/inode.c | 16 ++++++++++++++++ include/linux/fs.h | 45 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 60 insertions(+), 1 deletion(-) diff --git a/fs/inode.c b/fs/inode.c index d37fad91c8da..21b026d95b51 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_set_ctime_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_set_ctime_current(struct inode *inode) +{ + struct timespec64 now = current_time(inode); + + inode_set_ctime(inode, now.tv_sec, now.tv_nsec); + return now; +} +EXPORT_SYMBOL(inode_set_ctime_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 824accb89a91..bdfbd11a5811 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1474,7 +1474,50 @@ 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_set_ctime_current(struct inode *inode); + +/** + * inode_get_ctime - 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_get_ctime(const struct inode *inode) +{ + return inode->i_ctime; +} + +/** + * inode_set_ctime_to_ts - set the ctime in the inode + * @inode: inode in which to set the ctime + * @ts: value to set in the ctime field + * + * Set the ctime in @inode to @ts + */ +static inline struct timespec64 inode_set_ctime_to_ts(struct inode *inode, + struct timespec64 ts) +{ + inode->i_ctime = ts; + return ts; +} + +/** + * inode_set_ctime - set the ctime in the inode + * @inode: inode in which to set the ctime + * @sec: tv_sec value to set + * @nsec: tv_nsec value to set + * + * Set the ctime in @inode to { @sec, @nsec } + */ +static inline struct timespec64 inode_set_ctime(struct inode *inode, + time64_t sec, long nsec) +{ + struct timespec64 ts = { .tv_sec = sec, + .tv_nsec = nsec }; + + return inode_set_ctime_to_ts(inode, ts); +} /* * Snapshotting support.