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fsnotify: add groups to fsnotify_inode_groups when registering inode watch

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Currently all fsnotify groups are added immediately to the
fsnotify_inode_groups list upon creation.  This means, even groups with no
watches (common for audit) will be on the global tracking list and will
get checked for every event.  This patch adds groups to the global list on
when the first inode mark is added to the group.

Signed-of-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris
2009-12-17 21:24:23 -05:00
parent 36fddebaa8
commit 4ca763523e
3 changed files with 17 additions and 10 deletions
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18
fs/notify/group.c
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@@ -77,12 +77,15 @@ void fsnotify_recalc_group_mask(struct fsnotify_group *group)
fsnotify_recalc_global_mask();
}
static void fsnotify_add_group(struct fsnotify_group *group)
void fsnotify_add_inode_group(struct fsnotify_group *group)
{
BUG_ON(!mutex_is_locked(&fsnotify_grp_mutex));
mutex_lock(&fsnotify_grp_mutex);
if (!group->on_inode_group_list)
list_add_tail_rcu(&group->inode_group_list, &fsnotify_inode_groups);
group->on_inode_group_list = 1;
list_add_tail_rcu(&group->inode_group_list, &fsnotify_inode_groups);
mutex_unlock(&fsnotify_grp_mutex);
}
/*
@@ -188,22 +191,17 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
*/
atomic_set(&group->num_marks, 1);
mutex_init(&group->notification_mutex);
INIT_LIST_HEAD(&group->notification_list);
init_waitqueue_head(&group->notification_waitq);
group->max_events = UINT_MAX;
INIT_LIST_HEAD(&group->inode_group_list);
spin_lock_init(&group->mark_lock);
INIT_LIST_HEAD(&group->mark_entries);
group->ops = ops;
mutex_lock(&fsnotify_grp_mutex);
fsnotify_add_group(group);
mutex_unlock(&fsnotify_grp_mutex);
return group;
}