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authorEric Paris <eparis@redhat.com>2009-12-17 21:24:21 -0500
committerEric Paris <eparis@redhat.com>2010-07-28 09:58:49 -0400
commitb4e4e1407312ae5a267ed7d716e6d4e7120a8430 (patch)
tree2953d8885e3224955f1a5aca7c129709b26a059d /fs/notify/notification.c
parent74766bbfa99adf8cb8119df6121851edba21c9d9 (diff)
downloadlinux-linaro-stable-b4e4e1407312ae5a267ed7d716e6d4e7120a8430.tar.gz
fsnotify: clone existing events
fsnotify_clone_event will take an event, clone it, and return the cloned event to the caller. Since events may be in use by multiple fsnotify groups simultaneously certain event entries (such as the mask) cannot be changed after the event was created. Since fanotify would like to merge events happening on the same file it needs a new clean event to work with so it can change any fields it wishes. Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs/notify/notification.c')
-rw-r--r--fs/notify/notification.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index 6dc96b35e4a7..bc9470c7ece7 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -284,11 +284,33 @@ static void initialize_event(struct fsnotify_event *event)
spin_lock_init(&event->lock);
- event->data_type = FSNOTIFY_EVENT_NONE;
-
INIT_LIST_HEAD(&event->private_data_list);
}
+struct fsnotify_event *fsnotify_clone_event(struct fsnotify_event *old_event)
+{
+ struct fsnotify_event *event;
+
+ event = kmem_cache_alloc(fsnotify_event_cachep, GFP_KERNEL);
+ if (!event)
+ return NULL;
+
+ memcpy(event, old_event, sizeof(*event));
+ initialize_event(event);
+
+ if (event->name_len) {
+ event->file_name = kstrdup(old_event->file_name, GFP_KERNEL);
+ if (!event->file_name) {
+ kmem_cache_free(fsnotify_event_cachep, event);
+ return NULL;
+ }
+ }
+ if (event->data_type == FSNOTIFY_EVENT_PATH)
+ path_get(&event->path);
+
+ return event;
+}
+
/*
* fsnotify_create_event - Allocate a new event which will be sent to each
* group's handle_event function if the group was interested in this
@@ -324,6 +346,7 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
event->sync_cookie = cookie;
event->to_tell = to_tell;
+ event->data_type = data_type;
switch (data_type) {
case FSNOTIFY_EVENT_FILE: {
@@ -340,12 +363,10 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
event->path.dentry = path->dentry;
event->path.mnt = path->mnt;
path_get(&event->path);
- event->data_type = FSNOTIFY_EVENT_PATH;
break;
}
case FSNOTIFY_EVENT_INODE:
event->inode = data;
- event->data_type = FSNOTIFY_EVENT_INODE;
break;
case FSNOTIFY_EVENT_NONE:
event->inode = NULL;