Re: [PATCH 12/18] btrfs: allow MAP_SYNC mmap

From: Adam Borowski <kilobyte(a)angband.pl&gt; Used by userspace to detect DAX. [rgoldwyn(a)suse.com: Added CONFIG_FS_DAX around mmap_supported_flags]

Signed-off-by: Adam Borowski <kilobyte(a)angband.pl&gt; Signed-off-by: Goldwyn Rodrigues <rgoldwyn(a)suse.com&gt; --- fs/btrfs/file.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 9d5a3c99a6b9..362a9cf9dcb2 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -16,6 +16,7 @@ #include <linux/btrfs.h> #include <linux/uio.h> #include <linux/iversion.h> +#include <linux/mman.h> #include "ctree.h" #include "disk-io.h" #include "transaction.h" @@ -3319,6 +3320,9 @@ const struct file_operations btrfs_file_operations = { .splice_read = generic_file_splice_read, .write_iter = btrfs_file_write_iter, .mmap = btrfs_file_mmap, +#ifdef CONFIG_FS_DAX + .mmap_supported_flags = MAP_SYNC, +#endif .open = btrfs_file_open, .release = btrfs_release_file, .fsync = btrfs_sync_file, -- 2.16.4