X-Git-Url: http://bbs.cooldavid.org/git/?a=blobdiff_plain;f=fs%2Fchar_dev.c;h=143d393881cbd86865063649dd9b27773a5dcf57;hb=c0bb5862a9076992e2cbeb5fa0d08c2ac3d4fbb0;hp=f80a4f25123c3fa912daa1eb4080e69dab3d58fb;hpb=2d813760d75150db437e40d340ae0e06ddd54a34;p=net-next-2.6.git

diff --git a/fs/char_dev.c b/fs/char_dev.c
index f80a4f25123..143d393881c 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -40,7 +40,9 @@ struct backing_dev_info directly_mappable_cdev_bdi = {
 #endif
 		/* permit direct mmap, for read, write or exec */
 		BDI_CAP_MAP_DIRECT |
-		BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP),
+		BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP |
+		/* no writeback happens */
+		BDI_CAP_NO_ACCT_AND_WRITEBACK),
 };
 
 static struct kobj_map *cdev_map;