The arbitrary 4MB minimum namespace size turns out to be too large for
some environments. Quoting Cheng-mean Liu:
In the case of emulated NVDIMM devices in the VM environment, there
are scenarios that NVDIMM device with much smaller sizes are
desired, for example, we might use a single enumerated NVDIMM DAX
device for representing each container layer, which in some cases
could be just a few KBs size.
PAGE_SIZE is the minimum where we can still support DAX of at least
a single page.
Cc: Matthew Wilcox <wi...@infradead.org>
Reported-by: Cheng-mean Liu <socc...@microsoft.com>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
include/uapi/linux/ndctl.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 30ef1236aafa..7e27070b9440 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -209,7 +209,7 @@ enum nd_driver_flags {
};
enum {
- ND_MIN_NAMESPACE_SIZE = 0x00400000,
+ ND_MIN_NAMESPACE_SIZE = PAGE_SIZE,
};
enum ars_masks {
