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-rw-r--r--fs/notify/notification.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index c69b18b..346f6e5 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -35,6 +35,7 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
+#include <linux/module.h>
#include <linux/mount.h>
#include <linux/mutex.h>
#include <linux/namei.h>
@@ -56,6 +57,17 @@ static struct kmem_cache *fsnotify_event_holder_cachep;
* get set to 0 so it will never get 'freed'
*/
static struct fsnotify_event q_overflow_event;
+static atomic_t fsnotify_sync_cookie = ATOMIC_INIT(0);
+
+/**
+ * fsnotify_get_cookie - return a unique cookie for use in synchronizing events.
+ * Called from fsnotify_move, which is inlined into filesystem modules.
+ */
+u32 fsnotify_get_cookie(void)
+{
+ return atomic_inc_return(&fsnotify_sync_cookie);
+}
+EXPORT_SYMBOL_GPL(fsnotify_get_cookie);
/* return true if the notify queue is empty, false otherwise */
bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group)
@@ -266,6 +278,8 @@ static void initialize_event(struct fsnotify_event *event)
event->file_name = NULL;
event->name_len = 0;
+
+ event->sync_cookie = 0;
}
/*
@@ -280,8 +294,8 @@ static void initialize_event(struct fsnotify_event *event)
* @data_type flag indication if the data is a file, path, inode, nothing...
* @name the filename, if available
*/
-struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
- void *data, int data_type, const char *name)
+struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, void *data,
+ int data_type, const char *name, u32 cookie)
{
struct fsnotify_event *event;
@@ -299,6 +313,8 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
}
event->name_len = strlen(event->file_name);
}
+
+ event->sync_cookie = cookie;
event->to_tell = to_tell;
switch (data_type) {
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