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fsnotify: generic notification queue and waitq

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inotify needs to do asyc notification in which event information is stored
on a queue until the listener is ready to receive it.  This patch
implements a generic notification queue for inotify (and later fanotify) to
store events to be sent at a later time.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Eric Paris
2009-05-21 17:01:37 -04:00
parent 3c5119c05d
commit a2d8bc6cb4
4 changed files with 281 additions and 10 deletions
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9
fs/notify/group.c
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@@ -91,6 +91,9 @@ static void fsnotify_get_group(struct fsnotify_group *group)
*/
void fsnotify_final_destroy_group(struct fsnotify_group *group)
{
/* clear the notification queue of all events */
fsnotify_flush_notify(group);
if (group->ops->free_group_priv)
group->ops->free_group_priv(group);
@@ -214,6 +217,12 @@ struct fsnotify_group *fsnotify_obtain_group(unsigned int group_num, __u32 mask,
group->group_num = group_num;
group->mask = mask;
mutex_init(&group->notification_mutex);
INIT_LIST_HEAD(&group->notification_list);
init_waitqueue_head(&group->notification_waitq);
group->q_len = 0;
group->max_events = UINT_MAX;
spin_lock_init(&group->mark_lock);
atomic_set(&group->num_marks, 0);
INIT_LIST_HEAD(&group->mark_entries);