From patchwork Thu Feb 27 21:12:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Simmons X-Patchwork-Id: 11410877 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2E2211580 for ; Thu, 27 Feb 2020 21:49:31 +0000 (UTC) Received: from pdx1-mailman02.dreamhost.com (pdx1-mailman02.dreamhost.com [64.90.62.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 16A4024690 for ; Thu, 27 Feb 2020 21:49:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16A4024690 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lustre-devel-bounces@lists.lustre.org Received: from pdx1-mailman02.dreamhost.com (localhost [IPv6:::1]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id 0B95D34A6C1; Thu, 27 Feb 2020 13:41:06 -0800 (PST) X-Original-To: lustre-devel@lists.lustre.org Delivered-To: lustre-devel-lustre.org@pdx1-mailman02.dreamhost.com Received: from smtp3.ccs.ornl.gov (smtp3.ccs.ornl.gov [160.91.203.39]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id 85D1721FC1A for ; Thu, 27 Feb 2020 13:19:36 -0800 (PST) Received: from star.ccs.ornl.gov (star.ccs.ornl.gov [160.91.202.134]) by smtp3.ccs.ornl.gov (Postfix) with ESMTP id 541062C72; Thu, 27 Feb 2020 16:18:16 -0500 (EST) Received: by star.ccs.ornl.gov (Postfix, from userid 2004) id 52BF5468; Thu, 27 Feb 2020 16:18:16 -0500 (EST) From: James Simmons To: Andreas Dilger , Oleg Drokin , NeilBrown Date: Thu, 27 Feb 2020 16:12:04 -0500 Message-Id: <1582838290-17243-257-git-send-email-jsimmons@infradead.org> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1582838290-17243-1-git-send-email-jsimmons@infradead.org> References: <1582838290-17243-1-git-send-email-jsimmons@infradead.org> Subject: [lustre-devel] [PATCH 256/622] lustre: llite: ll_fault fixes X-BeenThere: lustre-devel@lists.lustre.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "For discussing Lustre software development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lustre Development List MIME-Version: 1.0 Errors-To: lustre-devel-bounces@lists.lustre.org Sender: "lustre-devel" From: Patrick Farrell Various error conditions in the fault path can cause us to not return a page in vm_fault. Check if it's present before accessing it. WC-bug-id: https://jira.whamcloud.com/browse/LU-11403 Lustre-commit: a8f4d1e5fd79 ("LU-11403 llite: ll_fault fixes") Signed-off-by: Patrick Farrell Reviewed-on: https://review.whamcloud.com/34247 Reviewed-by: Alex Zhuravlev Reviewed-by: Alexander Zarochentsev Reviewed-by: Oleg Drokin Signed-off-by: James Simmons --- fs/lustre/llite/llite_mmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/lustre/llite/llite_mmap.c b/fs/lustre/llite/llite_mmap.c index 236d1d2..37ce508 100644 --- a/fs/lustre/llite/llite_mmap.c +++ b/fs/lustre/llite/llite_mmap.c @@ -378,7 +378,8 @@ static vm_fault_t ll_fault(struct vm_fault *vmf) return VM_FAULT_SIGBUS; restart: result = __ll_fault(vmf->vma, vmf); - if (!(result & (VM_FAULT_RETRY | VM_FAULT_ERROR | VM_FAULT_LOCKED))) { + if (vmf->page && + !(result & (VM_FAULT_RETRY | VM_FAULT_ERROR | VM_FAULT_LOCKED))) { struct page *vmpage = vmf->page; /* check if this page has been truncated */