From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 4DCD42D3A69; Wed, 17 Dec 2025 06:10:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765951828; cv=none; b=MJG4CCd+LeaKu9R5tLVE98GiP7hrzTpoeOCx+wO//kdfim9L3/kTJSQz5Z8IPQfD20/k1ovZqLhydIB469BsWow3gkJckOeAdNV15EQxbVaioiiaxdgmEtC/v4QtGXevotTLxFYFYUHOCRRvvpfE0Fq1B1qrycoJkH//qwJROj0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765951828; c=relaxed/simple; bh=n/ts86dlJHFC1dtjkqgZ3MJH7gMwJ/qoS8cXeqwI98o=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fvPL1o0PhGvfeH3/Z2kSnpM9CD471QWJ19O78fMPPvAdysF0KjqNgbV3Cw0Sz9CdAErb0MkflPPS6W22V6TSgcVOqiPH03d41yCrmWCQLM+aSLAvP1WQooF6LbdA20HxnI/LzoyY6rrhK91XqyLhYy0A7w+ok+jq3RdN3vVzCSY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=RWaIE1XN; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="RWaIE1XN" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=Hg/tESeGWqFXyE6OY/4FD3HnRJ5gNtQ9rs6sVZ/sm/I=; b=RWaIE1XNo2xqIf3v0pGEty3Vki i+XyIgwgRWHpSRL5IOdxnnbugZImmEzMyU9gjru4003sHk0x1z1h5Q+sR+1QYMYD+zBAX48bDlSkv /eY5BUfdn0Roh8veto2Y5ZTRz+JO9BdfXAEGHbqg89WiF9fNB7ILVgKSVlt61wPTxW8LajYjdh4s3 Vapn/ah77rbNgBkL1F6/I1ldQx6KpEy2cCc9qkJ4qVeH/McHKj//6iOUJFRaTkPXa8uVckHnDKis0 QEn0e7jOdiGQ5noV1sixi4BZUMf7H0rIvn4F6x7YyBVftkCq4jInersDaT8mfv8JcCU0EDxPMkMpc dIe+M5hw==; Received: from 2a02-8389-2341-5b80-d601-7564-c2e0-491c.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:d601:7564:c2e0:491c] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vVkjt-00000006DOb-2Y4Q; Wed, 17 Dec 2025 06:10:24 +0000 From: Christoph Hellwig To: Christian Brauner Cc: Al Viro , David Sterba , Jan Kara , Mike Marshall , Martin Brandenburg , Carlos Maiolino , Stefan Roesch , Jeff Layton , linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, gfs2@lists.linux.dev, io-uring@vger.kernel.org, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-mtd@lists.infradead.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org Subject: re-enable IOCB_NOWAIT writes to files v3 Date: Wed, 17 Dec 2025 07:09:33 +0100 Message-ID: <20251217061015.923954-1-hch@lst.de> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Hi all, commit 66fa3cedf16a ("fs: Add async write file modification handling.") effectively disabled IOCB_NOWAIT writes as timestamp updates currently always require blocking, and the modern timestamp resolution means we always update timestamps. This leads to a lot of context switches from applications using io_uring to submit file writes, making it often worse than using the legacy aio code that is not using IOCB_NOWAIT. This series allows non-blocking updates for lazytime if the file system supports it, and adds that support for XFS. Changes since v2: - drop patches merged upstream - adjust for the inode state accesors - keep a check in __writeback_single_inode instead of exercising potentially undefined behavior - more spelling fixes Changes since v1: - more regular numbering of the S_* flags - fix XFS to actually not block - don't ignore the generic_update_time return value in file_update_time_flags - fix the sync_lazytime return value - fix an out of data comment in btrfs - fix a race that would update i_version before returning -EAGAIN in XFS Diffstat: Documentation/filesystems/locking.rst | 2 Documentation/filesystems/vfs.rst | 6 ++ fs/btrfs/inode.c | 11 +++- fs/fat/misc.c | 3 + fs/fs-writeback.c | 52 ++++++++++++++++--- fs/gfs2/inode.c | 6 +- fs/inode.c | 89 +++++++++++++++++++--------------- fs/internal.h | 3 - fs/nfs/inode.c | 4 - fs/orangefs/inode.c | 8 ++- fs/overlayfs/inode.c | 3 + fs/sync.c | 4 - fs/ubifs/file.c | 11 ++-- fs/xfs/xfs_iops.c | 35 ++++++++++++- fs/xfs/xfs_super.c | 29 ----------- include/linux/fs.h | 19 ++++--- include/trace/events/writeback.h | 6 -- 17 files changed, 182 insertions(+), 109 deletions(-)