From patchwork Tue Jul 25 14:58:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13326663 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 123A41F17C; Tue, 25 Jul 2023 14:59:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2936C433AD; Tue, 25 Jul 2023 14:59:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690297176; bh=t187d4hlj7Hd2B853hoiIPlXJE4vBx7O1lkOZGTYDW8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=SSmBXICMwwOT3suM7Wh9+/efKJhkY/qtCAceKg5JcawInGhDeAcad93pkmikV0o+6 4WemX3e9jmjVTbdAQRpQdyZIhz1g9e0iDBRjM7wITplVnNb0dKwcSeSRf8RXFJDlWS 05qhAWRZOBxveiT38itiEKwwzi2cwotnAfVwMeMGzQCXfg4aP/7QA/7BOeFl3k+q2W k4L1Wuc6aR3dIYbSuqKgvU4mO6BXIuKAuk+5ULb3C0pXfvdRzoF0OIGIEUDaE/vzJU 9DjaVzezFk7HWbRa31mtwovPb4u6potKHgCKfEVNxB3PuDjxy8+/zOplOia8cZNwpQ rRGJw4To0RgnQ== From: Jeff Layton Date: Tue, 25 Jul 2023 10:58:20 -0400 Subject: [PATCH v6 7/7] btrfs: convert to multigrain timestamps Precedence: bulk X-Mailing-List: v9fs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20230725-mgctime-v6-7-a794c2b7abca@kernel.org> References: <20230725-mgctime-v6-0-a794c2b7abca@kernel.org> In-Reply-To: <20230725-mgctime-v6-0-a794c2b7abca@kernel.org> To: Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Howells , Marc Dionne , Chris Mason , Josef Bacik , David Sterba , Xiubo Li , Ilya Dryomov , Jan Harkes , coda@cs.cmu.edu, Tyler Hicks , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Namjae Jeon , Sungjong Seo , Jan Kara , Theodore Ts'o , Andreas Dilger , Jaegeuk Kim , OGAWA Hirofumi , Miklos Szeredi , Bob Peterson , Andreas Gruenbacher , Greg Kroah-Hartman , Tejun Heo , Alexander Viro , Christian Brauner , Trond Myklebust , Anna Schumaker , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Mike Marshall , Martin Brandenburg , Luis Chamberlain , Kees Cook , Iurii Zaikin , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Sergey Senozhatsky , Richard Weinberger , Hans de Goede , Hugh Dickins , Andrew Morton , "Darrick J. Wong" Cc: Dave Chinner , Anthony Iliopoulos , v9fs@lists.linux.dev, linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-mtd@lists.infradead.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, Jeff Layton X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2706; i=jlayton@kernel.org; h=from:subject:message-id; bh=t187d4hlj7Hd2B853hoiIPlXJE4vBx7O1lkOZGTYDW8=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBkv+MkzroP27sCWuNSIgl+Cd1orLkVgLYnAGcGo qEGnD3ITTiJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZL/jJAAKCRAADmhBGVaC FezWEACH2UPwfc8Rd5LxW2eGVPkB5meVxJPlOLQBj6pWDkW95diD7uXPQto9lmLQF4qdUED+5gy WLeo0BKULpIsDQGcmeJ0JkL/JiN2PbntEUg4RArSmU+rbZrR++dnF7ONr6ND9nWmLJNpuajyStV pcZilQXeumx55tirF1mt2vbGkXsKu/qHNXXLZ4CnD9fI2bIWLHaqsutS3k6iENOAKoEtdCWwoM9 FVpdj3qFKKuML2HPLPiNiqSR4PQMpFrJZuJtwugTZ4dV2zGIpz2l4Fo+eJzLD8g3FKg1A3Mk34F Uziz080sql3EtQDp+oM7E0vxs8NLvt2bJsGtEl+GEq10Z1KQiGEE118baYC/FF3Y1JhZ8N3o/6n NTmLgKCSGgEaX90TUrhvCtvVULKCcbHbm/RkOiIu7CC5iVHPV6RW/oHBDJVwKYW+2MlAb+VY5re f+nknpCe54xwkAkjA93/0IhnnhD1PqlAiOzimKBVA2WsnYyUS0Q10BesJm3HaFKmBvca1rkAIvY 5RVnuhgAlq6eH4QItdabELeq+RMtIFijqWrAAvDc0GPhlIwBn3i4uHiLu5D086UgM+5Nt7DjCZf 3QmNVnOo1Lw9zpdhHxNYnhUO9mT6oJzmtiR5/Z3Ca5TZ+LV2ivQE3dGm4TXhbyY0GAZ/FvepgyX df3wfm4D0Ck2M5Q== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Enable multigrain timestamps, which should ensure that there is an apparent change to the timestamp whenever it has been written after being actively observed via getattr. Beyond enabling the FS_MGTIME flag, this patch eliminates update_time_for_write, which goes to great pains to avoid in-memory stores. Just have it overwrite the timestamps unconditionally. Signed-off-by: Jeff Layton Acked-by: David Sterba --- fs/btrfs/file.c | 24 ++++-------------------- fs/btrfs/super.c | 5 +++-- 2 files changed, 7 insertions(+), 22 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index d7a9ece7a40b..b9e75c9f95ac 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1106,25 +1106,6 @@ void btrfs_check_nocow_unlock(struct btrfs_inode *inode) btrfs_drew_write_unlock(&inode->root->snapshot_lock); } -static void update_time_for_write(struct inode *inode) -{ - struct timespec64 now, ctime; - - if (IS_NOCMTIME(inode)) - return; - - now = current_time(inode); - if (!timespec64_equal(&inode->i_mtime, &now)) - inode->i_mtime = now; - - ctime = inode_get_ctime(inode); - if (!timespec64_equal(&ctime, &now)) - inode_set_ctime_to_ts(inode, now); - - if (IS_I_VERSION(inode)) - inode_inc_iversion(inode); -} - static int btrfs_write_check(struct kiocb *iocb, struct iov_iter *from, size_t count) { @@ -1156,7 +1137,10 @@ static int btrfs_write_check(struct kiocb *iocb, struct iov_iter *from, * need to start yet another transaction to update the inode as we will * update the inode when we finish writing whatever data we write. */ - update_time_for_write(inode); + if (!IS_NOCMTIME(inode)) { + inode->i_mtime = inode_set_ctime_current(inode); + inode_inc_iversion(inode); + } start_pos = round_down(pos, fs_info->sectorsize); oldsize = i_size_read(inode); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index f1dd172d8d5b..8eda51b095c9 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2144,7 +2144,7 @@ static struct file_system_type btrfs_fs_type = { .name = "btrfs", .mount = btrfs_mount, .kill_sb = btrfs_kill_super, - .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, + .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_MGTIME, }; static struct file_system_type btrfs_root_fs_type = { @@ -2152,7 +2152,8 @@ static struct file_system_type btrfs_root_fs_type = { .name = "btrfs", .mount = btrfs_mount_root, .kill_sb = btrfs_kill_super, - .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP, + .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | + FS_ALLOW_IDMAP | FS_MGTIME, }; MODULE_ALIAS_FS("btrfs");