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UPSTREAM: libnvdimm, namespace: make min namespace size 4K

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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 <willy@infradead.org>
Reported-by: Cheng-mean Liu <soccerl@microsoft.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
(cherry picked from commit f2ba5a5baecf795c2150826bd0c95fc3f7f3d226)
Bug: 146400078
Bug: 148297388
Change-Id: I362c3d1bf27921f69e78a9c34674176e85e391f7
Signed-off-by: Alistair Delva <adelva@google.com>
This commit is contained in:
Dan Williams 2018-02-01 21:27:22 -08:00 committed by Alistair Delva
parent 8f92c773d6
commit 3a88df7f17
1 changed files with 1 additions and 1 deletions
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2
include/uapi/linux/ndctl.h
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@ -257,7 +257,7 @@ enum nd_driver_flags {
};
enum {
ND_MIN_NAMESPACE_SIZE = 0x00400000,
ND_MIN_NAMESPACE_SIZE = PAGE_SIZE,
};
enum ars_masks {