From: Vishal Verma Subject: [PATCH v5 1/5] dax: fallback from pmd to pte on error Date: Fri, 6 May 2016 15:53:07 -0600 Message-ID: <1462571591-3361-2-git-send-email-vishal.l.verma@intel.com> References: <1462571591-3361-1-git-send-email-vishal.l.verma@intel.com> 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, Ross Zwisler , Dave Chinner , Jan Kara , Jens Axboe , Andrew Morton , linux-kernel@vger.kernel.org, Christoph Hellwig , Jeff Moyer , Boaz Harrosh To: linux-nvdimm@lists.01.org Return-path: In-Reply-To: <1462571591-3361-1-git-send-email-vishal.l.verma@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org 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