From patchwork Wed Oct 18 17:41:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Layton X-Patchwork-Id: 13427584 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FC7ACDB484 for ; Wed, 18 Oct 2023 17:42:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E41A18D0180; Wed, 18 Oct 2023 13:41:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DC8F78D0016; Wed, 18 Oct 2023 13:41:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C418D8D0180; Wed, 18 Oct 2023 13:41:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id AF8428D0016 for ; Wed, 18 Oct 2023 13:41:57 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 7B36BA043C for ; Wed, 18 Oct 2023 17:41:57 +0000 (UTC) X-FDA: 81359300274.10.1F91264 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by imf20.hostedemail.com (Postfix) with ESMTP id 1334B1C0005 for ; Wed, 18 Oct 2023 17:41:54 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="W/ufbXG6"; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf20.hostedemail.com: domain of jlayton@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=jlayton@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1697650915; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3I/im1cm3Iyi8zoSuG5Q4U80yeBCLsvqQYdBnHrWXJ4=; b=VabfWY5A3A9OHSygIryh5DbDblzaYaMoL6XtldDrxr4UhO3/MCP/ShjDQW+NkarMnEYHeG U7YuqbkMF67BCfgHoB6ozAsjfT27RVQzfg00sYmy0ShFHPw+CHL1HkiMPxG8L9H6x31lRt A3sGabyXLZCQapIxsdVO8IBEjzf+M0A= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="W/ufbXG6"; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf20.hostedemail.com: domain of jlayton@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=jlayton@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1697650915; a=rsa-sha256; cv=none; b=zTdkBNsYzAbhxd9r8FItn6G1Ory/7KV1uiG2WqVeQ4ZURe8vTE1M5QtZLcf2shbDhlQcmu sMb38kCH2QVegmv289ZWN+j3u2M4CfjDhm+rsXObJNsOQ+Y/C0F0XvShU0BiIWPVopMgQL y1exRGd7w3q+kYa6BM7qtoYVUYiIpfg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 36509CE2658; Wed, 18 Oct 2023 17:41:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 438D3C433D9; Wed, 18 Oct 2023 17:41:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697650911; bh=08peVOKZI4MR32wuXNO48w8LFAelNL7UOowvOcywmvk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=W/ufbXG6bJI9e49CMjNUjxnvN8rpYE07kV1Uv10lbs/C8hNuvNOyNt34VfqYnC9DS I49zl61Mm94s/lF9vju5dzbq67/qC6Ar9L8q60dVvEDaVDtocmAwykqrLymr+qZux/ lVbBynbEAYYfrdp3mlaPnhPGOSlk/bLGkiSCd3V/9bKS5BgA9OPrfvjMa7CO0JzooF M9MdsOlxGkVapwTxlcbX6mNMMUoJtnBk5eL19Gf1y3rjt63K4Q+9v6Pai1IDz/fGIO pb4hveW0yjsp2pnmsVFm6s91KvwIgLFKzm8zK2eCovTbh6AP1vv+TXLbdyc/5r18WG RuObwSWU6PuEA== From: Jeff Layton Date: Wed, 18 Oct 2023 13:41:15 -0400 Subject: [PATCH RFC 8/9] btrfs: convert to multigrain timestamps MIME-Version: 1.0 Message-Id: <20231018-mgtime-v1-8-4a7a97b1f482@kernel.org> References: <20231018-mgtime-v1-0-4a7a97b1f482@kernel.org> In-Reply-To: <20231018-mgtime-v1-0-4a7a97b1f482@kernel.org> To: Linus Torvalds , Alexander Viro , Christian Brauner , John Stultz , Thomas Gleixner , Stephen Boyd , Chandan Babu R , "Darrick J. Wong" , Dave Chinner , Theodore Ts'o , Andreas Dilger , Chris Mason , Josef Bacik , David Sterba , Hugh Dickins , Andrew Morton , Amir Goldstein , Jan Kara , David Howells Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-mm@kvack.org, linux-nfs@vger.kernel.org, Jeff Layton X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2744; i=jlayton@kernel.org; h=from:subject:message-id; bh=08peVOKZI4MR32wuXNO48w8LFAelNL7UOowvOcywmvk=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBlMBjJZH0sHfYjXHZeCrVOFs/hUFjZBM0oBFoPW KoouqyR/TCJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZTAYyQAKCRAADmhBGVaC FSbeEACAUjZExA/YblPlgkxwqx2TRI6TFuS5NFnYMhcyki2B2XIkJnpD00JJl8GKM2MskyOvrQ8 Yd7Q8MzEyeQXxkNNt0V+DWuQYMst+8EKu9X5/T7v/1Anjkaz3ZzdirOXSZR6N53cMMLFGgSpJSv mUGs7YUWvT8XrGon0xoQ1CIuie6MmZkT5AQfZEc/0tTcmqk9uNg2/4VypX+oQeNMSyMf+xzO7Ss iQMxMetZB5ZQB1goTm4qxKjeOI3+mzLV977iDUyM96oHtAhYzUukSms5Hw6dNZDMRFkzOweotXZ IXY180/C7BmfVwV7MGwpqfVBRWiVNZEJDRERUQGB3cXYfYlETLz0enJOQvdvw697641AptAD0RD 9sqdT2M5ue6hTbEBj0y/DtlwhFPMeKr2KSDih9MgJZiqUPD89I/hx5RtNbvWcy8QM7ZH/+HVbVq RPl5tV9C0deifptk08XdKAgSnFPEg6Tm5ahINqN5V+lYnhd/b9CjY1kShQfBjex8bwxaUXnXMAq VZamJx2U4u1P3bNGzCpoON3dNyRXvIx3l3Kyc2E4+la0DaCeknTxoXrKWabtu31CEFLEsNN6QGj bC+V3q+EAl3kxNPQV7gpgEJKVOTyWeBu30B76+qZgKOQk4JrNb2ZVmXK2Kj3VHs7OONPBZShAfo fyUe5HZ/2zFbI5A== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 1334B1C0005 X-Stat-Signature: kfrubszby1edz1bbm3rh9qss44upau6h X-Rspam-User: X-HE-Tag: 1697650914-262795 X-HE-Meta: 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 yhEEwHGn EOPEwz80UY7ZU0WwEiNWbiuBKqya17Khr9WoQX9lvArpqMwQZdpJ1DW8f3vZ4D+fVy7kBuAbXGeV9SLNK5x3t7oEvHbP4v0DPojHIJSfvjwxJyUAotwqqeXW2ztna4EbRhu+Yg2W82nDgGURlw5PzcGeHRqT6AOhoCYu/CnpPB2oJdU6UW1rB6OLibPABSv/Epk0DERwor23tYDCCQQK64XgfAzmpgdGl0nUZsl0v5lWaBlQFpPDHXa1P+w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 --- fs/btrfs/file.c | 25 ++++--------------------- fs/btrfs/super.c | 5 +++-- 2 files changed, 7 insertions(+), 23 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 278a4ea651e1..321405bf788c 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1106,26 +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, ts; - - if (IS_NOCMTIME(inode)) - return; - - now = current_time(inode); - ts = inode_get_mtime(inode); - if (!timespec64_equal(&ts, &now)) - inode_set_mtime_to_ts(inode, now); - - ts = inode_get_ctime(inode); - if (!timespec64_equal(&ts, &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) { @@ -1157,7 +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_set_mtime_to_ts(inode, 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 f49e597e197f..570613bfd25f 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2154,7 +2154,7 @@ 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 = { @@ -2162,7 +2162,8 @@ 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");