diff options
Diffstat (limited to 'fs/notify/group.c')
| -rw-r--r-- | fs/notify/group.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/fs/notify/group.c b/fs/notify/group.c index 34fccbd2809..aa4654fe6ec 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); |