Btrfs: fix regressions in copy_from_user handling

[mv-sheeva.git] / fs / char_dev.c

diff --git a/fs/char_dev.c b/fs/char_dev.c
index f80a4f25123c3fa912daa1eb4080e69dab3d58fb..143d393881cbd86865063649dd9b27773a5dcf57 100644 (file)
--- 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;