diff mbox series

[12/18] btrfs: allow MAP_SYNC mmap

Message ID 20190416164154.30390-13-rgoldwyn@suse.de (mailing list archive)
State Superseded
Headers show
Series btrfs dax support | expand

Commit Message

Goldwyn Rodrigues April 16, 2019, 4:41 p.m. UTC 
From: Adam Borowski <kilobyte@angband.pl>

Used by userspace to detect DAX.
[rgoldwyn@suse.com: Added CONFIG_FS_DAX around mmap_supported_flags]
Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/file.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

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,