diff options
| author | Dave Jiang | 2018-04-19 13:39:43 -0700 |
|---|---|---|
| committer | Dan Williams | 2018-04-19 15:11:50 -0700 |
| commit | ef8423022324cf79bd1b41d8707c766461e7e555 (patch) | |
| tree | b8e9e4cf41c1aa3bc463512d83f9182ec93419ad | |
| parent | f22acf82746dd3d75e06d7c5801926d3b9c50169 (diff) | |
device-dax: allow MAP_SYNC to succeed
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: b6fb293f2497 ("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>
| -rw-r--r-- | drivers/dax/device.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index be8606457f27..aff2c1594220 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -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) |