[PATCH] inotify: add MOVE_SELF event

This adds a MOVE_SELF event to inotify.  It is sent whenever the inode
you are watching is moved.  We need this event so that we can catch
something like this:

 - app1:
	watch /etc/mtab

 - app2:
	cp /etc/mtab /tmp/mtab-work
	mv /etc/mtab /etc/mtab~
	mv /tmp/mtab-work /etc/mtab

app1 still thinks it's watching /etc/mtab but it's actually watching
/etc/mtab~.

Signed-off-by: John McCutchan <ttb@tentacle.dhs.org>
Signed-off-by: Robert Love <rml@novell.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 10 insertions, 3 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 57046d98a746..b85f158aef0c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2216,7 +2216,8 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry);
         if (!error) {
                 const char *new_name = old_dentry->d_name.name;
-                fsnotify_move(old_dir, new_dir, old_name, new_name, is_dir, new_dentry->d_inode);
+                fsnotify_move(old_dir, new_dir, old_name, new_name, is_dir,
+                              new_dentry->d_inode, old_dentry->d_inode);
         }
         fsnotify_oldname_free(old_name);
 
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 602c305c8585..03b8e7932b83 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -21,7 +21,7 @@
  */
 static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
                                  const char *old_name, const char *new_name,
-                                 int isdir, struct inode *target)
+                                 int isdir, struct inode *target, struct inode *source)
 {
         u32 cookie = inotify_get_cookie();
 
@@ -41,6 +41,10 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
                 inotify_inode_queue_event(target, IN_DELETE_SELF, 0, NULL);
                 inotify_inode_is_dead(target);
         }
+
+        if (source) {
+                inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL);
+        }
 }
 
 /*
diff --git a/include/linux/inotify.h b/include/linux/inotify.h
index a40c2bf0408e..93bb3afe646b 100644
--- a/include/linux/inotify.h
+++ b/include/linux/inotify.h
@@ -35,6 +35,7 @@ struct inotify_event {
 #define IN_CREATE               0x00000100      /* Subfile was created */
 #define IN_DELETE               0x00000200      /* Subfile was deleted */
 #define IN_DELETE_SELF          0x00000400      /* Self was deleted */
+#define IN_MOVE_SELF            0x00000800      /* Self was moved */
 
 /* the following are legal events.  they are sent as needed to any watch */
 #define IN_UNMOUNT              0x00002000      /* Backing fs was unmounted */
@@ -56,7 +57,8 @@ struct inotify_event {
  */
 #define IN_ALL_EVENTS   (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
                          IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
-                         IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF)
+                         IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
+                         IN_MOVE_SELF)
 
 #ifdef __KERNEL__