From mboxrd@z Thu Jan 1 00:00:00 1970 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 C8C0A19E992 for ; Fri, 26 Sep 2025 14:51:53 +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=1758898313; cv=none; b=e1RqQzvu7Xxss/USzlVXHKT5eNQmD8mw1r3nT8PFI78OHqY/eH4/pGauJUMTxxK3FjVQy0QgcpmGj7K3SVX8bMDe5/FhCrSwluhizm7i7s7tyaiRJxGDyDnMMQErbNEFGtz/NH0xjTyOsbM+UcrJq5nrZwncEqV2VpvnLBs+b/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758898313; c=relaxed/simple; bh=kSENoX7a2YxxPMg1a9fn23SWD66H5TCmrPluuJoB2qM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=QAx52TC1WfTC8UaEwohXo3i8RQ7u8REUBxdxkTlgoJeVkmraPHSB7NFXl05NqpvJUDFIlWl4E5LPUfiX999tgRd/WnKv2RIVmgM+YYgZnr8POVgMenuOwm+irfi9Ryo/MtYG6GyGcNGSiA+s4NpJxCqvPcAln1S4xjafltOdkGU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OBAt+53w; 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="OBAt+53w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B3582C4CEF7; Fri, 26 Sep 2025 14:51:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758898313; bh=kSENoX7a2YxxPMg1a9fn23SWD66H5TCmrPluuJoB2qM=; h=From:To:Cc:Subject:Date:From; b=OBAt+53wA9x3CKWNCI4ebT23m94KX/qo60X48ZFjWZNAKx2it4pQUfiazvHXfh0vk ICP2+0J1J/ys0ZfGXmZz6Guxfpcee+XrZOLK0QpIJU3cZ0gwQPqHY1gMGzNgOLV+MB xlCGOaXuEoIo1hcxcJVHxVQ8fj/Rm6zlltYTQ3NB3MZCWFcjsyZMdcxZ+xo9FA/x/z NAkbPmCBLDq3ZBLnr5au0UApMvafq5RAkm2pGiUrj7pmIGjzLXoXuEDAkqqXcEYkMX Ud3AoeTj1+XpBAjUXcLXSd7cyInxZcoXlj3hLe8+JRdfjgdEVAOGrXZS0JZ3WHAUJS 7R79rBkp/jjvQ== From: Chuck Lever To: NeilBrown , Jeff Layton , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: , Chuck Lever Subject: [PATCH v4 0/4] NFSD direct I/O read Date: Fri, 26 Sep 2025 10:51:47 -0400 Message-ID: <20250926145151.59941-1-cel@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chuck Lever The goal is to get the experimental read-side direct I/O implementation merged sooner. We are still thinking through the implications of mixing direct and buffered I/O when handling an NFS WRITE that does not meet the dio alignment requirements. Changes since v3: * Move xdr_reserve_space_vec() call to preserve the page_len value * Note that "add STATX_DIOALIGN and STATX_DIO_READ_ALIGN ..." remains exactly the same as it was in the v3 series Changes since v2: * "Add array bounds-checking..." has been applied to nfsd-testing * Add a page_len check before committing to use direct I/O Changes since v1: * Harden the loop that constructs the I/O bvec * Address review comments Changes from Mike's v9: * The LOC introduced by the feature has been reduced considerably. * A new trace point in nfsd_file_getattr reports each file's dio alignment parameters when it is opened. * The direct I/O path has been taken out-of-line so that it may continue to be modified and optimized without perturbing the more commonly-used I/O paths. * When an exported file system does not implement direct I/O, more commonly-used modes are employed instead to avoid returning EOPNOTSUPP unexpectedly. * When NFSD_IO_DIRECT is selected, NFS READs of all sizes use direct I/O to provide better experimental data about small I/O workloads. Chuck Lever (2): NFSD: Relocate the xdr_reserve_space_vec() call site NFSD: Implement NFSD_IO_DIRECT for NFS READ Mike Snitzer (2): NFSD: filecache: add STATX_DIOALIGN and STATX_DIO_READ_ALIGN support NFSD: pass nfsd_file to nfsd_iter_read() fs/nfsd/debugfs.c | 2 + fs/nfsd/filecache.c | 34 ++++++++++++++++ fs/nfsd/filecache.h | 4 ++ fs/nfsd/nfs4xdr.c | 28 +++++++++---- fs/nfsd/nfsd.h | 1 + fs/nfsd/nfsfh.c | 4 ++ fs/nfsd/trace.h | 28 +++++++++++++ fs/nfsd/vfs.c | 89 +++++++++++++++++++++++++++++++++++++++-- fs/nfsd/vfs.h | 2 +- include/trace/misc/fs.h | 22 ++++++++++ 10 files changed, 202 insertions(+), 12 deletions(-) -- 2.51.0