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device-dax: allow MAP_SYNC to succeed

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MAP_SYNC is a nop for device-dax. Allow MAP_SYNC to succeed on device-dax
to eliminate special casing between device-dax and fs-dax as to when the
flag can be specified. Device-dax users already implicitly assume that they do
not need to call fsync(), and this enables them to explicitly check for this
capability.

Cc: <stable@vger.kernel.org>
Fixes: b6fb293f24 ("mm: Define MAP_SYNC and VM_SYNC flags")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2018-04-19 13:39:43 -07:00 committed by Dan Williams
parent f22acf8274
commit ef84230223
1 changed files with 2 additions and 0 deletions
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2
drivers/dax/device.c
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@ -19,6 +19,7 @@
#include <linux/dax.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include "dax-private.h"
#include "dax.h"
@ -540,6 +541,7 @@ static const struct file_operations dax_fops = {
.release = dax_release,
.get_unmapped_area = dax_get_unmapped_area,
.mmap = dax_mmap,
.mmap_supported_flags = MAP_SYNC,
};
static void dev_dax_release(struct device *dev)