3 files changed, 30 insertions, 5 deletions

diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index b8cf161f5a6d..64efda9aae62 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -34,6 +34,25 @@ static inline void fsnotify_parent(struct path *path, struct dentry *dentry, __u
         __fsnotify_parent(path, dentry, mask);
 }
 
+/* simple call site for access decisions */
+static inline int fsnotify_perm(struct file *file, int mask)
+{
+        struct path *path = &file->f_path;
+        struct inode *inode = path->dentry->d_inode;
+        __u32 fsnotify_mask;
+
+        if (file->f_mode & FMODE_NONOTIFY)
+                return 0;
+        if (!(mask & (MAY_READ | MAY_OPEN)))
+                return 0;
+        if (mask & MAY_READ)
+                fsnotify_mask = FS_ACCESS_PERM;
+        if (mask & MAY_OPEN)
+                fsnotify_mask = FS_OPEN_PERM;
+
+        return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+}
+
 /*
  * fsnotify_d_move - dentry has been moved
  * Called with dcache_lock and dentry->d_lock held.
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index efe9ba321cf2..c34728e7d8cb 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -41,6 +41,9 @@
 #define FS_Q_OVERFLOW           0x00004000      /* Event queued overflowed */
 #define FS_IN_IGNORED           0x00008000      /* last inotify event here */
 
+#define FS_OPEN_PERM            0x00010000      /* open event in an permission hook */
+#define FS_ACCESS_PERM          0x00020000      /* access event in a permissions hook */
+
 #define FS_IN_ISDIR             0x40000000      /* event occurred against dir */
 #define FS_IN_ONESHOT           0x80000000      /* only send event once */
 
@@ -282,8 +285,8 @@ struct fsnotify_mark {
 /* called from the vfs helpers */
 
 /* main fsnotify call to send events */
-extern void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
-                     const unsigned char *name, u32 cookie);
+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 void __fsnotify_inode_delete(struct inode *inode);
 extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt);
@@ -413,9 +416,11 @@ extern int fsnotify_replace_event(struct fsnotify_event_holder *old_holder,
 
 #else
 
-static inline void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
-                            const unsigned char *name, u32 cookie)
-{}
+static inline int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
+                           const unsigned char *name, u32 cookie)
+{
+        return 0;
+}
 
 static inline void __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
 {}
diff --git a/include/linux/security.h b/include/linux/security.h
index 0c8819170463..24fc29540aa3 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -23,6 +23,7 @@
 #define __LINUX_SECURITY_H
 
 #include <linux/fs.h>
+#include <linux/fsnotify.h>
 #include <linux/binfmts.h>
 #include <linux/signal.h>
 #include <linux/resource.h>