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fsnotify: fsnotify_add_notify_event should return an event

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Rather than the horrific void ** argument and such just to pass the
fanotify_merge event back to the caller of fsnotify_add_notify_event() have
those things return an event if it was different than the event suggusted to
be added.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris
2010-07-28 10:18:37 -04:00
parent 5ba08e2eeb
commit f70ab54cc6
5 changed files with 101 additions and 95 deletions
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fs/notify/notification.c
+28 -14
View File
@@ -137,16 +137,14 @@ struct fsnotify_event_private_data *fsnotify_remove_priv_from_event(struct fsnot
* event off the queue to deal with. If the event is successfully added to the
* group's notification queue, a reference is taken on event.
*/
int fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_event *event,
struct fsnotify_event_private_data *priv,
int (*merge)(struct list_head *,
struct fsnotify_event *,
void **arg),
void **arg)
struct fsnotify_event *fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_event *event,
struct fsnotify_event_private_data *priv,
struct fsnotify_event *(*merge)(struct list_head *,
struct fsnotify_event *))
{
struct fsnotify_event *return_event = NULL;
struct fsnotify_event_holder *holder = NULL;
struct list_head *list = &group->notification_list;
int rc = 0;
pr_debug("%s: group=%p event=%p priv=%p\n", __func__, group, event, priv);
@@ -162,27 +160,37 @@ int fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_even
alloc_holder:
holder = fsnotify_alloc_event_holder();
if (!holder)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
}
mutex_lock(&group->notification_mutex);
if (group->q_len >= group->max_events) {
event = q_overflow_event;
rc = -EOVERFLOW;
/*
* we need to return the overflow event
* which means we need a ref
*/
fsnotify_get_event(event);
return_event = event;
/* sorry, no private data on the overflow event */
priv = NULL;
}
if (!list_empty(list) && merge) {
int ret;
struct fsnotify_event *tmp;
ret = merge(list, event, arg);
if (ret) {
tmp = merge(list, event);
if (tmp) {
mutex_unlock(&group->notification_mutex);
if (return_event)
fsnotify_put_event(return_event);
if (holder != &event->holder)
fsnotify_destroy_event_holder(holder);
return ret;
return tmp;
}
}
@@ -197,6 +205,12 @@ alloc_holder:
* event holder was used, go back and get a new one */
spin_unlock(&event->lock);
mutex_unlock(&group->notification_mutex);
if (return_event) {
fsnotify_put_event(return_event);
return_event = NULL;
}
goto alloc_holder;
}
@@ -211,7 +225,7 @@ alloc_holder:
mutex_unlock(&group->notification_mutex);
wake_up(&group->notification_waitq);
return rc;
return return_event;
}
/*