diff options
author | Dave Jiang <dave.jiang@intel.com> | 2018-04-19 13:39:43 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-24 09:43:10 +0200 |
commit | 86d04eb7ecf1dec069e52e0e82f68943703fa08a (patch) | |
tree | e12bf204010ec03371ca51c929fd2f776fb9ae64 | |
parent | e5872ce01019ccd9cb383a1463366e0b5a443960 (diff) |
device-dax: allow MAP_SYNC to succeed
commit ef8423022324cf79bd1b41d8707c766461e7e555 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-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 2137dbc29877..383779707404 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" @@ -534,6 +535,7 @@ 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) |