From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f176.google.com (mail-pf0-f176.google.com [209.85.192.176]) by kanga.kvack.org (Postfix) with ESMTP id D10286B0253 for ; Tue, 29 Mar 2016 22:00:21 -0400 (EDT) Received: by mail-pf0-f176.google.com with SMTP id x3so29213523pfb.1 for ; Tue, 29 Mar 2016 19:00:21 -0700 (PDT) Received: from mga04.intel.com (mga04.intel.com. [192.55.52.120]) by mx.google.com with ESMTP id h88si2504247pfh.115.2016.03.29.19.00.20 for ; Tue, 29 Mar 2016 19:00:20 -0700 (PDT) From: Vishal Verma Subject: [PATCH v2 2/5] dax: fallback from pmd to pte on error Date: Tue, 29 Mar 2016 19:59:47 -0600 Message-Id: <1459303190-20072-3-git-send-email-vishal.l.verma@intel.com> In-Reply-To: <1459303190-20072-1-git-send-email-vishal.l.verma@intel.com> References: <1459303190-20072-1-git-send-email-vishal.l.verma@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-nvdimm@lists.01.org Cc: Dan Williams , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, xfs@oss.sgi.com, linux-ext4@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox , Ross Zwisler , Dave Chinner , Jan Kara , Jens Axboe , Al Viro , Andrew Morton , linux-kernel@vger.kernel.org, Christoph Hellwig From: Dan Williams In preparation for consulting a badblocks list in pmem_direct_access(), teach dax_pmd_fault() to fallback rather than fail immediately upon encountering an error. The thought being that reducing the span of the dax request may avoid the error region. Signed-off-by: Dan Williams --- fs/dax.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index 90322eb..ec6417b 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -945,8 +945,8 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address, long length = dax_map_atomic(bdev, &dax); if (length < 0) { - result = VM_FAULT_SIGBUS; - goto out; + dax_pmd_dbg(&bh, address, "dax-error fallback"); + goto fallback; } if (length < PMD_SIZE) { dax_pmd_dbg(&bh, address, "dax-length too small"); -- 2.5.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org