fanotify: ignored_mask to ignore events
When fanotify receives an event it will check event->mask & ~ignored_mask.
If no bits are left the event will not be sent.
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index f690002..060b177 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -100,31 +100,39 @@
}
static bool should_send_vfsmount_event(struct fsnotify_group *group, struct vfsmount *mnt,
- __u32 mask)
+ struct inode *inode, __u32 mask)
{
- struct fsnotify_mark *fsn_mark;
- bool send;
+ struct fsnotify_mark *mnt_mark;
+ struct fsnotify_mark *inode_mark;
pr_debug("%s: group=%p vfsmount=%p mask=%x\n",
__func__, group, mnt, mask);
- fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
- if (!fsn_mark)
+ mnt_mark = fsnotify_find_vfsmount_mark(group, mnt);
+ if (!mnt_mark)
return false;
- send = (mask & fsn_mark->mask);
+ mask &= mnt_mark->mask;
+ mask &= ~mnt_mark->ignored_mask;
+
+ if (mask) {
+ inode_mark = fsnotify_find_inode_mark(group, inode);
+ if (inode_mark) {
+ mask &= ~inode_mark->ignored_mask;
+ fsnotify_put_mark(inode_mark);
+ }
+ }
/* find took a reference */
- fsnotify_put_mark(fsn_mark);
+ fsnotify_put_mark(mnt_mark);
- return send;
+ return mask;
}
static bool should_send_inode_event(struct fsnotify_group *group, struct inode *inode,
__u32 mask)
{
struct fsnotify_mark *fsn_mark;
- bool send;
pr_debug("%s: group=%p inode=%p mask=%x\n",
__func__, group, inode, mask);
@@ -137,20 +145,21 @@
* events on the child, don't send it! */
if ((mask & FS_EVENT_ON_CHILD) &&
!(fsn_mark->mask & FS_EVENT_ON_CHILD)) {
- send = false;
+ mask = 0;
} else {
/*
* We care about children, but do we care about this particular
* type of event?
*/
- mask = (mask & ~FS_EVENT_ON_CHILD);
- send = (fsn_mark->mask & mask);
+ mask &= ~FS_EVENT_ON_CHILD;
+ mask &= fsn_mark->mask;
+ mask &= ~fsn_mark->ignored_mask;
}
/* find took a reference */
fsnotify_put_mark(fsn_mark);
- return send;
+ return mask;
}
static bool fanotify_should_send_event(struct fsnotify_group *group, struct inode *to_tell,
@@ -170,7 +179,7 @@
return false;
if (mnt)
- return should_send_vfsmount_event(group, mnt, mask);
+ return should_send_vfsmount_event(group, mnt, to_tell, mask);
else
return should_send_inode_event(group, to_tell, mask);
}