fanotify: limit number of listeners per user

[net-next-2.6.git] / include / linux / fsnotify_backend.h

diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index e40190d1687813d5c86e2a1b9e414e48fcf22595..4366f458a86af6da0d67a57109467885a72519ad 100644 (file)
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -64,6 +64,8 @@
 
 #define FS_MOVE                        (FS_MOVED_FROM | FS_MOVED_TO)
 
+#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
+
 #define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
                             FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \
                             FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
@@ -129,6 +131,14 @@ struct fsnotify_group {
        wait_queue_head_t notification_waitq;   /* read() on the notification file blocks on this waitq */
        unsigned int q_len;                     /* events on the queue */
        unsigned int max_events;                /* maximum events allowed on the list */
+       /*
+        * Valid fsnotify group priorities.  Events are send in order from highest
+        * priority to lowest priority.  We default to the lowest priority.
+        */
+       #define FS_PRIO_0       0 /* normal notifiers, no permissions */
+       #define FS_PRIO_1       1 /* fanotify content based access control */
+       #define FS_PRIO_2       2 /* fanotify pre-content access */
+       unsigned int priority;
 
        /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */
        spinlock_t mark_lock;           /* protect marks_list */
@@ -159,6 +169,8 @@ struct fsnotify_group {
                        bool bypass_perm; /* protected by access_mutex */
 #endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
                        int f_flags;
+                       unsigned int max_marks;
+                       struct user_struct *user;
                } fanotify_data;
 #endif /* CONFIG_FANOTIFY */
        };
@@ -294,7 +306,7 @@ struct fsnotify_mark {
 /* main fsnotify call to send events */
 extern int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
                    const unsigned char *name, u32 cookie);
-extern void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask);
+extern int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask);
 extern void __fsnotify_inode_delete(struct inode *inode);
 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
 extern u32 fsnotify_get_cookie(void);
@@ -423,8 +435,10 @@ static inline int fsnotify(struct inode *to_tell, __u32 mask, void *data, int da
        return 0;
 }
 
-static inline void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
-{}
+static inline int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
+{
+       return 0;
+}
 
 static inline void __fsnotify_inode_delete(struct inode *inode)
 {}