diff mbox

[v7,1/6] dax: fallback from pmd to pte on error

Message ID 1463000932-31680-2-git-send-email-vishal.l.verma@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Verma, Vishal L May 11, 2016, 9:08 p.m. UTC 
From: Dan Williams <dan.j.williams@intel.com>

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.

Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 fs/dax.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/fs/dax.c b/fs/dax.c
index 9bc6624..d602410 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -855,8 +855,8 @@  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");