From: Dan Williams <dan.j.willi...@intel.com>
1/ If a mapping overlaps a bad sector fail the request.
2/ Do not opportunistically report more dax-capable capacity than is
requested when errors present.
[vishal: fix a conflict with system RAM collision patches]
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
block/ioctl.c | 9 ---------
drivers/nvdimm/pmem.c | 8 ++++++++
2 files changed, 8 insertions(+), 9 deletions(-)
diff --git a/block/ioctl.c b/block/ioctl.c
index d8996bb..cd7f392 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -423,15 +423,6 @@ bool blkdev_dax_capable(struct block_device *bdev)
|| (bdev->bd_part->nr_sects % (PAGE_SIZE / 512)))
return false;
- /*
- * If the device has known bad blocks, force all I/O through the
- * driver / page cache.
- *
- * TODO: support finer grained dax error handling
- */
- if (disk->bb && disk->bb->count)
- return false;
-
return true;
}
#endif
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index da10554..eac5f93 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -174,9 +174,17 @@ static long pmem_direct_access(struct block_device *bdev,
struct pmem_device *pmem = bdev->bd_disk->private_data;
resource_size_t offset = sector * 512 + pmem->data_offset;
+ if (unlikely(is_bad_pmem(&pmem->bb, sector, dax->size)))
+ return -EIO;
dax->addr = pmem->virt_addr + offset;
dax->pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
+ /*
+ * If badblocks are present, limit known good range to the
+ * requested range.
+ */
+ if (unlikely(pmem->bb.count))
+ return dax->size;
return pmem->size - pmem->pfn_pad - offset;
}
--
2.5.5
