fanotify: allow users to set an ignored_mask

Change the sys_fanotify_mark() system call so users can set ignored_masks
on inodes.  Remember, if a user new sets a real mask, and only sets ignored
masks, the ignore will never be pinned in memory.  Thus ignored_masks can
be lost under memory pressure and the user may again get events they
previously thought were ignored.

Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 90e59b24fd04..b8daa9f9b560 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -30,12 +30,14 @@
 #define FAN_MARK_DONT_FOLLOW    0x00000004
 #define FAN_MARK_ONLYDIR        0x00000008
 #define FAN_MARK_MOUNT          0x00000010
+#define FAN_MARK_IGNORED_MASK   0x00000020
 
 #define FAN_ALL_MARK_FLAGS      (FAN_MARK_ADD |\
                                  FAN_MARK_REMOVE |\
                                  FAN_MARK_DONT_FOLLOW |\
                                  FAN_MARK_ONLYDIR |\
-                                 FAN_MARK_MOUNT)
+                                 FAN_MARK_MOUNT |\
+                                 FAN_MARK_IGNORED_MASK)
 
 /*
  * All of the events - we build the list by hand so that we can add flags in