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Diffstat (limited to 'fs/notify/group.c')
-rw-r--r--fs/notify/group.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/fs/notify/group.c b/fs/notify/group.c
index 34fccbd2809c..aa4654fe6ec2 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -32,10 +32,14 @@
static DEFINE_MUTEX(fsnotify_grp_mutex);
/* protects reads while running the fsnotify_groups list */
struct srcu_struct fsnotify_grp_srcu;
-/* all groups registered to receive filesystem notifications */
+/* all groups registered to receive inode filesystem notifications */
LIST_HEAD(fsnotify_inode_groups);
+/* all groups registered to receive mount point filesystem notifications */
+LIST_HEAD(fsnotify_vfsmount_groups);
/* bitwise OR of all events (FS_*) interesting to some group on this system */
__u32 fsnotify_inode_mask;
+/* bitwise OR of all events (FS_*) interesting to some group on this system */
+__u32 fsnotify_vfsmount_mask;
/*
* When a new group registers or changes it's set of interesting events
@@ -44,14 +48,20 @@ __u32 fsnotify_inode_mask;
void fsnotify_recalc_global_mask(void)
{
struct fsnotify_group *group;
- __u32 mask = 0;
+ __u32 inode_mask = 0;
+ __u32 vfsmount_mask = 0;
int idx;
idx = srcu_read_lock(&fsnotify_grp_srcu);
list_for_each_entry_rcu(group, &fsnotify_inode_groups, inode_group_list)
- mask |= group->mask;
+ inode_mask |= group->mask;
+ list_for_each_entry_rcu(group, &fsnotify_vfsmount_groups, vfsmount_group_list)
+ vfsmount_mask |= group->mask;
+
srcu_read_unlock(&fsnotify_grp_srcu, idx);
- fsnotify_inode_mask = mask;
+
+ fsnotify_inode_mask = inode_mask;
+ fsnotify_vfsmount_mask = vfsmount_mask;
}
/*
@@ -77,6 +87,17 @@ void fsnotify_recalc_group_mask(struct fsnotify_group *group)
fsnotify_recalc_global_mask();
}
+void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
+{
+ mutex_lock(&fsnotify_grp_mutex);
+
+ if (!group->on_vfsmount_group_list)
+ list_add_tail_rcu(&group->vfsmount_group_list, &fsnotify_vfsmount_groups);
+ group->on_vfsmount_group_list = 1;
+
+ mutex_unlock(&fsnotify_grp_mutex);
+}
+
void fsnotify_add_inode_group(struct fsnotify_group *group)
{
mutex_lock(&fsnotify_grp_mutex);
@@ -132,6 +153,9 @@ static void __fsnotify_evict_group(struct fsnotify_group *group)
if (group->on_inode_group_list)
list_del_rcu(&group->inode_group_list);
group->on_inode_group_list = 0;
+ if (group->on_vfsmount_group_list)
+ list_del_rcu(&group->vfsmount_group_list);
+ group->on_vfsmount_group_list = 0;
}
/*
@@ -197,6 +221,7 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
group->max_events = UINT_MAX;
INIT_LIST_HEAD(&group->inode_group_list);
+ INIT_LIST_HEAD(&group->vfsmount_group_list);
spin_lock_init(&group->mark_lock);
INIT_LIST_HEAD(&group->mark_entries);