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authorEric Paris <eparis@redhat.com>2009-05-21 17:01:50 -0400
committerEric Paris <eparis@redhat.com>2009-06-11 14:57:54 -0400
commite4aff117368cfdd3567ee41844d216d079b55173 (patch)
treec467bc38edc7ba3154bbf6875dca635b855e1c8c /include
parent47882c6f51e8ef41fbbe2bbb746a1ea3228dd7ca (diff)
downloadlinux-e4aff117368cfdd3567ee41844d216d079b55173.tar.bz2
fsnotify: allow groups to add private data to events
inotify needs per group information attached to events. This patch allows groups to attach private information and implements a callback so that information can be freed when an event is being destroyed. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fsnotify_backend.h24
1 files changed, 19 insertions, 5 deletions
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index b78b5573d227..efdf9e442d86 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -63,6 +63,7 @@
struct fsnotify_group;
struct fsnotify_event;
struct fsnotify_mark_entry;
+struct fsnotify_event_private_data;
/*
* Each group much define these ops. The fsnotify infrastructure will call
@@ -81,6 +82,7 @@ struct fsnotify_ops {
int (*handle_event)(struct fsnotify_group *group, struct fsnotify_event *event);
void (*free_group_priv)(struct fsnotify_group *group);
void (*freeing_mark)(struct fsnotify_mark_entry *entry, struct fsnotify_group *group);
+ void (*free_event_priv)(struct fsnotify_event_private_data *priv);
};
/*
@@ -158,6 +160,15 @@ struct fsnotify_event_holder {
};
/*
+ * Inotify needs to tack data onto an event. This struct lets us later find the
+ * correct private data of the correct group.
+ */
+struct fsnotify_event_private_data {
+ struct fsnotify_group *group;
+ struct list_head event_list;
+};
+
+/*
* all of the information about the original object we want to now send to
* a group. If you want to carry more info from the accessing task to the
* listener this structure is where you need to be adding fields.
@@ -196,6 +207,8 @@ struct fsnotify_event {
u32 sync_cookie; /* used to corrolate events, namely inotify mv events */
char *file_name;
size_t name_len;
+
+ struct list_head private_data_list; /* groups can store private data here */
};
/*
@@ -294,17 +307,18 @@ extern void fsnotify_put_group(struct fsnotify_group *group);
/* take a reference to an event */
extern void fsnotify_get_event(struct fsnotify_event *event);
extern void fsnotify_put_event(struct fsnotify_event *event);
-/* find private data previously attached to an event */
-extern struct fsnotify_event_private_data *fsnotify_get_priv_from_event(struct fsnotify_group *group,
- struct fsnotify_event *event);
+/* find private data previously attached to an event and unlink it */
+extern struct fsnotify_event_private_data *fsnotify_remove_priv_from_event(struct fsnotify_group *group,
+ struct fsnotify_event *event);
/* attach the event to the group notification queue */
-extern int fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_event *event);
+extern int fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_event *event,
+ struct fsnotify_event_private_data *priv);
/* true if the group notification queue is empty */
extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
/* return, but do not dequeue the first event on the notification queue */
extern struct fsnotify_event *fsnotify_peek_notify_event(struct fsnotify_group *group);
-/* reutnr AND dequeue the first event on the notification queue */
+/* return AND dequeue the first event on the notification queue */
extern struct fsnotify_event *fsnotify_remove_notify_event(struct fsnotify_group *group);
/* functions used to manipulate the marks attached to inodes */