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libnvdimm, pfn, dax: limit namespace alignments to the supported set 

Now that we properly advertise the supported pte, pmd, and pud sizes,
restrict the supported alignments that can be set on a namespace. This
assumes that userspace was not previously relying on the ability to set
odd alignments. At least ndctl only ever supported setting the namespace
alignment to 4K, 2M, or 1G.

Cc: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
zero-colors
Dan Williams 2017-08-11 17:54:48 -07:00
parent 1fdadbebc4
commit f13d2b61e5
1 changed files with 2 additions and 21 deletions
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23
drivers/nvdimm/pfn_devs.c
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@ -134,26 +134,6 @@ static const unsigned long *nd_pfn_supported_alignments(void)
return data;
}
static ssize_t __align_store(struct nd_pfn *nd_pfn, const char *buf)
{
unsigned long val;
int rc;
rc = kstrtoul(buf, 0, &val);
if (rc)
return rc;
if (!is_power_of_2(val) || val < PAGE_SIZE || val > SZ_1G)
return -EINVAL;
if (nd_pfn->dev.driver)
return -EBUSY;
else
nd_pfn->align = val;
return 0;
}
static ssize_t align_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
@ -162,7 +142,8 @@ static ssize_t align_store(struct device *dev,
device_lock(dev);
nvdimm_bus_lock(dev);
rc = __align_store(nd_pfn, buf);
rc = nd_size_select_store(dev, buf, &nd_pfn->align,
nd_pfn_supported_alignments());
dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
rc, buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);