From b9efe8a234ad874a049460417c54680338f96360 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 7 Jun 2007 12:21:44 -0400
Subject: [PATCH] new helper - inotify_clone_watch()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/inotify.c            | 35 +++++++++++++++++++++++++++++++++++
 include/linux/inotify.h |  1 +
 2 files changed, 36 insertions(+)

diff --git a/fs/inotify.c b/fs/inotify.c
index 7457501b9565..4b2469bb6554 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -666,6 +666,41 @@ out:
 }
 EXPORT_SYMBOL_GPL(inotify_add_watch);
 
+/**
+ * inotify_clone_watch - put the watch next to existing one
+ * @old: already installed watch
+ * @new: new watch
+ *
+ * Caller must hold the inotify_mutex of inode we are dealing with;
+ * it is expected to remove the old watch before unlocking the inode.
+ */
+s32 inotify_clone_watch(struct inotify_watch *old, struct inotify_watch *new)
+{
+	struct inotify_handle *ih = old->ih;
+	int ret = 0;
+
+	new->mask = old->mask;
+	new->ih = ih;
+
+	mutex_lock(&ih->mutex);
+
+	/* Initialize a new watch */
+	ret = inotify_handle_get_wd(ih, new);
+	if (unlikely(ret))
+		goto out;
+	ret = new->wd;
+
+	get_inotify_handle(ih);
+
+	new->inode = igrab(old->inode);
+
+	list_add(&new->h_list, &ih->watches);
+	list_add(&new->i_list, &old->inode->inotify_watches);
+out:
+	mutex_unlock(&ih->mutex);
+	return ret;
+}
+
 /**
  * inotify_rm_wd - remove a watch from an inotify instance
  * @ih: inotify handle
diff --git a/include/linux/inotify.h b/include/linux/inotify.h
index d4f48c6402e6..e76e2272e2ab 100644
--- a/include/linux/inotify.h
+++ b/include/linux/inotify.h
@@ -120,6 +120,7 @@ extern __s32 inotify_find_update_watch(struct inotify_handle *, struct inode *,
 				       u32);
 extern __s32 inotify_add_watch(struct inotify_handle *, struct inotify_watch *,
 			       struct inode *, __u32);
+extern __s32 inotify_clone_watch(struct inotify_watch *, struct inotify_watch *);
 extern int inotify_rm_watch(struct inotify_handle *, struct inotify_watch *);
 extern int inotify_rm_wd(struct inotify_handle *, __u32);
 extern void inotify_remove_watch_locked(struct inotify_handle *,
-- 
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