From patchwork Fri Apr 23 13:33:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 12220699 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09CCFC433ED for ; Fri, 23 Apr 2021 13:35:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CBCA7613C3 for ; Fri, 23 Apr 2021 13:35:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236969AbhDWNgN (ORCPT ); Fri, 23 Apr 2021 09:36:13 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:21632 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242996AbhDWNek (ORCPT ); Fri, 23 Apr 2021 09:34:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619184844; h=from:from: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; bh=QeznpStb+QZXrFIpQsqwTeuQeft9y2EpZxKS25L+ORg=; b=I1YpvPhDxTEMZLsHvVcxXBVBHVmTNoGPKJ+DS5+eNob6+nlBx2T5FO1l9grRN/6Y5Q1uSX bs6X+kGX0/z33/RPKOAlN5mgwBvUkpKs/8qxu9GKMvtsNODYaCtruKDEwElK7rtcqaIRyy S74WXw3XnTJmM9I4naIweVSJ0rrgwHs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-453-CyJTLYMpMielQKfmXVl1eg-1; Fri, 23 Apr 2021 09:34:02 -0400 X-MC-Unique: CyJTLYMpMielQKfmXVl1eg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F06DE1922023; Fri, 23 Apr 2021 13:33:59 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-112-124.rdu2.redhat.com [10.10.112.124]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6B68019D9B; Fri, 23 Apr 2021 13:33:56 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v7 26/31] afs: Wait on PG_fscache before modifying/releasing a page From: David Howells To: linux-fsdevel@vger.kernel.org Cc: Marc Dionne , linux-afs@lists.infradead.org, linux-cachefs@redhat.com, dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , David Wysochanski , "Matthew Wilcox (Oracle)" , Alexander Viro , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org Date: Fri, 23 Apr 2021 14:33:55 +0100 Message-ID: <161918483555.3145707.11368355545275201782.stgit@warthog.procyon.org.uk> In-Reply-To: <161918446704.3145707.14418606303992174310.stgit@warthog.procyon.org.uk> References: <161918446704.3145707.14418606303992174310.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org PG_fscache is going to be used to indicate that a page is being written to the cache, and that the page should not be modified or released until it's finished. Make afs_invalidatepage() and afs_releasepage() wait for it. Signed-off-by: David Howells Tested-By: Marc Dionne cc: linux-afs@lists.infradead.org cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org Link: https://lore.kernel.org/r/158861253957.340223.7465334678444521655.stgit@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/159465832417.1377938.3571599385208729791.stgit@warthog.procyon.org.uk/ Link: https://lore.kernel.org/r/160588536286.3465195.13231895135369807920.stgit@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/161118153708.1232039.3535103645871176749.stgit@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/161161049369.2537118.11591934943429117060.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/161340412903.1303470.6424701655031380012.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/161539556890.286939.5873470593519458598.stgit@warthog.procyon.org.uk/ # v4 Link: https://lore.kernel.org/r/161653812726.2770958.18167145829938766503.stgit@warthog.procyon.org.uk/ # v5 Link: https://lore.kernel.org/r/161789096241.6155.5907241930823579235.stgit@warthog.procyon.org.uk/ # v6 --- fs/afs/file.c | 9 +++++++++ fs/afs/write.c | 10 ++++++++++ 2 files changed, 19 insertions(+) diff --git a/fs/afs/file.c b/fs/afs/file.c index 4a34ffaf6de4..f1e30b89e41c 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -593,6 +593,7 @@ static void afs_invalidatepage(struct page *page, unsigned int offset, if (PagePrivate(page)) afs_invalidate_dirty(page, offset, length); + wait_on_page_fscache(page); _leave(""); } @@ -610,6 +611,14 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags) /* deny if page is being written to the cache and the caller hasn't * elected to wait */ +#ifdef CONFIG_AFS_FSCACHE + if (PageFsCache(page)) { + if (!(gfp_flags & __GFP_DIRECT_RECLAIM) || !(gfp_flags & __GFP_FS)) + return false; + wait_on_page_fscache(page); + } +#endif + if (PagePrivate(page)) { detach_page_private(page); trace_afs_page_dirty(vnode, tracepoint_string("rel"), page); diff --git a/fs/afs/write.c b/fs/afs/write.c index 6e41b982c71b..1b8cabf5ac92 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -117,6 +117,10 @@ int afs_write_begin(struct file *file, struct address_space *mapping, SetPageUptodate(page); } +#ifdef CONFIG_AFS_FSCACHE + wait_on_page_fscache(page); +#endif + try_again: /* See if this page is already partially written in a way that we can * merge the new write with. @@ -857,6 +861,11 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) /* Wait for the page to be written to the cache before we allow it to * be modified. We then assume the entire page will need writing back. */ +#ifdef CONFIG_AFS_FSCACHE + if (PageFsCache(vmf->page) && + wait_on_page_bit_killable(vmf->page, PG_fscache) < 0) + return VM_FAULT_RETRY; +#endif if (wait_on_page_writeback_killable(vmf->page)) return VM_FAULT_RETRY; @@ -947,5 +956,6 @@ int afs_launder_page(struct page *page) detach_page_private(page); trace_afs_page_dirty(vnode, tracepoint_string("laundered"), page); + wait_on_page_fscache(page); return ret; }