From patchwork Mon Jul 29 16:19:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13745306 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 CC7828002E for ; Mon, 29 Jul 2024 16:20:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722270027; cv=none; b=L/MlmwrcgNjbXp4s/m7AIpKTf3s6PgAa/wKUZtERaPvA758Uewzvf4LJNczFt1yT7ZLdq/KNbVaiqK8zF5M+6w2efACcImC4AqWNTHbyEXWIxK2kCdHZ8HEFE2kUrg9dnI7ZyW6Rsp25+1u/pnSiAbciuwjzJ7dx5mw8/MsWGAA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722270027; c=relaxed/simple; bh=o4ybFsYlIEZgvNTOsvc3mtG5HslGRcMXCe0Z+Lvm4P0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=HQ9WpPnZ9l8NCyRMDGKXrSN1F5BTtzIXP7kpEHmKuj++G78v+E3ZHV9AVl3hM8iXuzC0dgFH/TnT0djuVaRYQDaUpy2WvDc8NSjcnqNbrPEbvWoaIDAji1icgYmOICqt07xD6RcGOfbDL8RrfRbYHHHQ8kohZWkv9wQtn3mQxIE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=ZbZqqXmg; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZbZqqXmg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722270024; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=DvXomQdGvyRIG4lEnvJDoKu3S4z81D4SNbDuP6bJxR8=; b=ZbZqqXmgd7ripwMiVAt0rRT071tSxsii8P684u44xruh1BcRCZJAioJH2ugbkAgQgf7KZ+ FVtX0U1hKfyk1GJ0JkQLEuZTXJjJpVrQwCHJ8Ex0ZjchI9VXyTnp522dI1kuBsiY+SmX5u vTqRIdCte4BL2G5H6WeMM+RfqC3PW+k= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-277-GK5lTh9JNCCiXxwe-IyT3A-1; Mon, 29 Jul 2024 12:20:21 -0400 X-MC-Unique: GK5lTh9JNCCiXxwe-IyT3A-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3E49D1955F42; Mon, 29 Jul 2024 16:20:13 +0000 (UTC) Received: from warthog.procyon.org.uk.com (unknown [10.42.28.216]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D295119560AE; Mon, 29 Jul 2024 16:20:05 +0000 (UTC) From: David Howells To: Christian Brauner , Steve French , Matthew Wilcox Cc: David Howells , Jeff Layton , Gao Xiang , Dominique Martinet , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Eric Van Hensbergen , Ilya Dryomov , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 00/24] netfs: Read/write improvements Date: Mon, 29 Jul 2024 17:19:29 +0100 Message-ID: <20240729162002.3436763-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Hi Christian, Steve, Willy, This set of patches includes one fscache fix and one cachefiles fix (1) Fix a cookie access race in fscache. (2) Fix the setxattr/removexattr syscalls to pull their arguments into kernel space before taking the sb_writers lock to avoid a deadlock against mm->mmap_lock. A couple of adjustments to the /proc/fs/netfs/stats file: (3) All the netfs stats lines begin 'Netfs:'. Change this to something a bit more useful. (4) Add a couple of stats counters to track the numbers of skips and waits on the per-inode writeback serialisation lock to make it easier to check for this as a source of performance loss. Some miscellaneous bits: (5) Reduce the number of conditional branches in netfs_perform_write(). (6) Move the CIFS_INO_MODIFIED_ATTR flag to the netfs_inode struct and remove cifs_post_modify(). (7) Move the max_len/max_nr_segs members from netfs_io_subrequest to netfs_io_request as they're only needed for one subreq at a time. (8) Add an 'unknown' source value for tracing purposes. (9) Remove NETFS_COPY_TO_CACHE as it's no longer used. (10) Set the request work function up front at allocation time. (11) Use bh-disabling spinlocks for rreq->lock as cachefiles completion may be run from block-filesystem DIO completion in softirq context. Then there's the main performance enhancing changes: (12) Define a structure, struct folio_queue, and a new iterator type, ITER_FOLIOQ, to hold a buffer as a replacement for ITER_XARRAY. See that patch for questions about naming and form. (13) Make cifs RDMA support ITER_FOLIOQ. (14) Add a function to reset the iterator in a subrequest. (15) Use folio queues in the write-side helpers instead of xarrays. (16) Simplify the write-side helpers to use sheaves to skip gaps rather than trying to work out where gaps are. (17) In afs, make the read subrequests asynchronous, putting them into work items to allow the next patch to do progressive unlocking/reading. (18) Overhaul the read-side helpers to improve performance. (19) Remove fs/netfs/io.c. (20) Fix the caching of a partial block at the end of a file. (21) Allow a store to be cancelled. Then some changes for cifs to make it use folio queues instead of xarrays for crypto bufferage: (22) Use raw iteration functions rather than manually coding iteration when hashing data. (23) Switch to using folio_queue for crypto buffers. (24) Remove the xarray bits. David David Howells (23): cachefiles: Fix non-taking of sb_writers around set/removexattr netfs: Adjust labels in /proc/fs/netfs/stats netfs: Record contention stats for writeback lock netfs: Reduce number of conditional branches in netfs_perform_write() netfs, cifs: Move CIFS_INO_MODIFIED_ATTR to netfs_inode netfs: Move max_len/max_nr_segs from netfs_io_subrequest to netfs_io_stream netfs: Reserve netfs_sreq_source 0 as unset/unknown netfs: Remove NETFS_COPY_TO_CACHE netfs: Set the request work function upon allocation netfs: Use bh-disabling spinlocks for rreq->lock mm: Define struct folio_queue and ITER_FOLIOQ to handle a sequence of folios cifs: Provide the capability to extract from ITER_FOLIOQ to RDMA SGEs netfs: Use new folio_queue data type and iterator instead of xarray iter netfs: Provide an iterator-reset function netfs: Simplify the writeback code afs: Make read subreqs async netfs: Speed up buffered reading netfs: Remove fs/netfs/io.c cachefiles, netfs: Fix write to partial block at EOF netfs: Cancel dirty folios that have no storage destination cifs: Use iterate_and_advance*() routines directly for hashing cifs: Switch crypto buffer to use a folio_queue rather than an xarray cifs: Don't support ITER_XARRAY Max Kellermann (1): fs/netfs/fscache_cookie: add missing "n_accesses" check fs/9p/vfs_addr.c | 5 +- fs/afs/file.c | 29 +- fs/afs/fsclient.c | 9 +- fs/afs/write.c | 4 +- fs/afs/yfsclient.c | 9 +- fs/cachefiles/io.c | 19 +- fs/cachefiles/xattr.c | 34 +- fs/ceph/addr.c | 72 ++-- fs/netfs/Makefile | 3 +- fs/netfs/buffered_read.c | 677 ++++++++++++++++++++++++----------- fs/netfs/buffered_write.c | 309 ++++++++-------- fs/netfs/direct_read.c | 147 +++++++- fs/netfs/fscache_cookie.c | 4 + fs/netfs/internal.h | 33 +- fs/netfs/io.c | 647 --------------------------------- fs/netfs/iterator.c | 50 +++ fs/netfs/main.c | 6 +- fs/netfs/misc.c | 94 +++++ fs/netfs/objects.c | 16 +- fs/netfs/read_collect.c | 540 ++++++++++++++++++++++++++++ fs/netfs/read_retry.c | 256 +++++++++++++ fs/netfs/stats.c | 23 +- fs/netfs/write_collect.c | 243 ++++--------- fs/netfs/write_issue.c | 92 ++--- fs/nfs/fscache.c | 19 +- fs/nfs/fscache.h | 7 +- fs/smb/client/cifsencrypt.c | 144 +------- fs/smb/client/cifsglob.h | 3 +- fs/smb/client/cifssmb.c | 6 +- fs/smb/client/file.c | 71 ++-- fs/smb/client/smb2ops.c | 218 ++++++----- fs/smb/client/smb2pdu.c | 10 +- fs/smb/client/smbdirect.c | 82 +++-- include/linux/folio_queue.h | 138 +++++++ include/linux/iov_iter.h | 104 ++++++ include/linux/netfs.h | 44 ++- include/linux/uio.h | 18 + include/trace/events/netfs.h | 140 ++++++-- lib/iov_iter.c | 229 +++++++++++- lib/kunit_iov_iter.c | 259 ++++++++++++++ lib/scatterlist.c | 69 +++- 41 files changed, 3175 insertions(+), 1707 deletions(-) delete mode 100644 fs/netfs/io.c create mode 100644 fs/netfs/read_collect.c create mode 100644 fs/netfs/read_retry.c create mode 100644 include/linux/folio_queue.h