From nobody Fri Nov 29 23:35:41 2024 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 6E7111D86C0; Sat, 14 Sep 2024 17:07:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726333670; cv=none; b=FZnsdqrc2Wify/skLbi5btvBEGe2I7drwd5qr44KYy5M6akAgoBHxEKtRq7D1iUagM8LPTUyq5+29hC6Qz8TROa+cqIQky97lpKEFhCUfwNd2E+t1MEhwtob8FEcCxlIz031WDoj0570SX9i86ewRzbhpBOc2ayHkWaE/zhcGBA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726333670; c=relaxed/simple; bh=gD0wNq7Gu5j1JVptVjT60GA5HV2tmuyZD0KoREfuUWw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qhMsg9hedwIPubjHF3dm3t+Rhjd+GvxXteoXlqZNmlz/o4x3zNCpqY1yJmxEKiAalcrbTzG2zy2t6v2pIAGpqUgEzg4bNgLIeQ39cueSrj7LQo1Ghn8J4MiDNZVNBcVsKLq8hvitfacB+EqZ+gdEosN+jrQDArXUBd7pYvPYPak= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OnsaXc9Y; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OnsaXc9Y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64294C4CECF; Sat, 14 Sep 2024 17:07:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726333670; bh=gD0wNq7Gu5j1JVptVjT60GA5HV2tmuyZD0KoREfuUWw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OnsaXc9Ymk3RYfHMoFlLfXvNdkNLPJT/nCCxRvBL04+CscVmYlVBuqxqN52CHdmZq rS++6tGhQj3jHFzyPbPjWZz60BE3gbH55x26rwO5tlfsF/Oy6ua//id7CsKu8XobYh XsyTGeKDPE9GQOa6pebLQ5hcvMqGTv743a/9EA7n6F578YF5ADhWllJWaCFs3ahd94 4G7wC+3BmpbRo179YYT9jFBP1j7K283dTrDdRUb8SKm+hEJdqDm9Iw7LZTIXza9b4Y Hy2/y7j2vFxVnXRqpTxnXQF3KFr34hNAELx6wKUpGn5vJFSPI1OcEq4FIAOYgFVVja DUQfrqF54ZGDw== From: Jeff Layton Date: Sat, 14 Sep 2024 13:07:23 -0400 Subject: [PATCH v8 10/11] btrfs: convert to multigrain timestamps Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240914-mgtime-v8-10-5bd872330bed@kernel.org> References: <20240914-mgtime-v8-0-5bd872330bed@kernel.org> In-Reply-To: <20240914-mgtime-v8-0-5bd872330bed@kernel.org> To: John Stultz , Thomas Gleixner , Stephen Boyd , Alexander Viro , Christian Brauner , Jan Kara , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Chandan Babu R , "Darrick J. Wong" , Theodore Ts'o , Andreas Dilger , Chris Mason , Josef Bacik , David Sterba , Hugh Dickins , Andrew Morton , Chuck Lever , Vadim Fedorenko Cc: Randy Dunlap , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org, Jeff Layton X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2660; i=jlayton@kernel.org; h=from:subject:message-id; bh=gD0wNq7Gu5j1JVptVjT60GA5HV2tmuyZD0KoREfuUWw=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBm5cLGDFBDcopNy/21OHrXrCajnq3tvWydZqq9f oWLLLJG7hyJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZuXCxgAKCRAADmhBGVaC FbCsEADDSDCuLOkoBu17JJLTtSg9T7tYQSu30N5o6tKAz5hfYb3oqONtgrosynqevuMTPya4ygi j2u7OXW8FNsPhJbFFfD7RYKB1bha7dDz9BXy1qJep8KB06FA4/ZZKqGo9Rtfo/S564yYOmrMtD1 LCCfM9ZMexmEjLRbE/6qQk9LKHL4RUkw/Uus8ZQw0m4pti5eQVEsZMvIyqDEKhzySyvg0Xgaqds k4SDLA4lRPxKpMm+kTdJ3nhEGNPL6AL8lzF0lzeT8rtq6HnV951MCwIbBPnAcGzXZH11GFmSwGh /r/HxQsBLNwqwXFzB+lqbp9403WElBb+E0J9Sj/6zQf7jA3CicYASW4ojXLpgxzzZGeSAfs2lkz RrQ8mEhezpMeVrn+HaorHAqEH7FzMvYSGJNE+Mxss0+hqBH/sJ7kja46tMW+5rzZ0SwjmNuue2W 1WyYbsohvdObP6z6hREpQ1OO7D9VQ6QoH0lOnOWGF4re20/p1yp7uclcGu7qe6UgMDtWCpjetRo 2DKRnag68WIlLO/hcUlJpg7HRhzU+kIB0YTG61GKnVdydjW2GQJScOLK8PxJJczGuWiesH9seJk hJB65WmjibjgT8/tq+g5CPdXoKRvGkyDBcSWcFPDeyO7uFLuDqqAFFH5S/OVgK9syKPrMNpx+te xeyJbodV8Mp6iSg== 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. Note that this also drops the IS_I_VERSION check and unconditionally bumps the change attribute, since SB_I_VERSION is always set on btrfs. Reviewed-by: Josef Bacik Signed-off-by: Jeff Layton --- fs/btrfs/file.c | 25 ++++--------------------- fs/btrfs/super.c | 3 ++- 2 files changed, 6 insertions(+), 22 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 2aeb8116549c..1656ad7498b8 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1120,26 +1120,6 @@ void btrfs_check_nocow_unlock(struct btrfs_inode *in= ode) btrfs_drew_write_unlock(&inode->root->snapshot_lock); } =20 -static void update_time_for_write(struct inode *inode) -{ - struct timespec64 now, ts; - - if (IS_NOCMTIME(inode)) - return; - - now =3D current_time(inode); - ts =3D inode_get_mtime(inode); - if (!timespec64_equal(&ts, &now)) - inode_set_mtime_to_ts(inode, now); - - ts =3D 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); -} - int btrfs_write_check(struct kiocb *iocb, struct iov_iter *from, size_t co= unt) { struct file *file =3D iocb->ki_filp; @@ -1170,7 +1150,10 @@ int btrfs_write_check(struct kiocb *iocb, struct iov= _iter *from, size_t count) * 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); + } =20 start_pos =3D round_down(pos, fs_info->sectorsize); oldsize =3D i_size_read(inode); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 98fa0f382480..d423acfe11d0 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2198,7 +2198,8 @@ static struct file_system_type btrfs_fs_type =3D { .init_fs_context =3D btrfs_init_fs_context, .parameters =3D btrfs_fs_parameters, .kill_sb =3D btrfs_kill_super, - .fs_flags =3D FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP, + .fs_flags =3D FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | + FS_ALLOW_IDMAP | FS_MGTIME, }; =20 MODULE_ALIAS_FS("btrfs"); --=20 2.46.0