From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 7A94E6B025E for ; Thu, 28 Apr 2016 17:17:24 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id 203so165429040pfy.2 for ; Thu, 28 Apr 2016 14:17:24 -0700 (PDT) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTP id fv2si13599089pad.86.2016.04.28.14.17.21 for ; Thu, 28 Apr 2016 14:17:22 -0700 (PDT) From: Vishal Verma Subject: [PATCH v4 2/7] dax: fallback from pmd to pte on error Date: Thu, 28 Apr 2016 15:16:53 -0600 Message-Id: <1461878218-3844-3-git-send-email-vishal.l.verma@intel.com> In-Reply-To: <1461878218-3844-1-git-send-email-vishal.l.verma@intel.com> References: <1461878218-3844-1-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 , Jeff Moyer 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 5a34f08..52f0044 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1111,8 +1111,8 @@ 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