diff options
| -rw-r--r-- | fs/notify/fsnotify.c | 5 | ||||
| -rw-r--r-- | fs/notify/fsnotify.h | 9 | ||||
| -rw-r--r-- | fs/notify/group.c | 107 | ||||
| -rw-r--r-- | fs/notify/mark.c | 9 | ||||
| -rw-r--r-- | include/linux/fsnotify_backend.h | 15 |
5 files changed, 2 insertions, 143 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 9ba29ee747c..1dd1fde1da0 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -219,11 +219,6 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, /* global tests shouldn't care about events on child only the specific event */ __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); - /* if no fsnotify listeners, nothing to do */ - if (list_empty(&fsnotify_inode_groups) && - list_empty(&fsnotify_vfsmount_groups)) - return 0; - if (mask & FS_MODIFY) __fsnotify_flush_ignored_mask(to_tell, data, data_is); diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h index b41dbf5a125..85e7d2b431d 100644 --- a/fs/notify/fsnotify.h +++ b/fs/notify/fsnotify.h @@ -6,11 +6,6 @@ #include <linux/srcu.h> #include <linux/types.h> -/* all groups which receive inode fsnotify events */ -extern struct list_head fsnotify_inode_groups; -/* all groups which receive vfsmount fsnotify events */ -extern struct list_head fsnotify_vfsmount_groups; - /* destroy all events sitting in this groups notification queue */ extern void fsnotify_flush_notify(struct fsnotify_group *group); @@ -28,10 +23,6 @@ extern int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark, struct fsnotify_group *group, struct vfsmount *mnt, int allow_dups); -/* add a group to the inode group list */ -extern void fsnotify_add_inode_group(struct fsnotify_group *group); -/* add a group to the vfsmount group list */ -extern void fsnotify_add_vfsmount_group(struct fsnotify_group *group); /* final kfree of a group */ extern void fsnotify_final_destroy_group(struct fsnotify_group *group); diff --git a/fs/notify/group.c b/fs/notify/group.c index fc0d966b270..d309f38449c 100644 --- a/fs/notify/group.c +++ b/fs/notify/group.c @@ -28,67 +28,6 @@ #include <asm/atomic.h> -/* protects writes to fsnotify_groups and fsnotify_mask */ -static DEFINE_MUTEX(fsnotify_grp_mutex); -/* 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); - -void fsnotify_add_vfsmount_group(struct fsnotify_group *group) -{ - struct fsnotify_group *group_iter; - - mutex_lock(&fsnotify_grp_mutex); - - if (!group->on_vfsmount_group_list) { - list_for_each_entry(group_iter, &fsnotify_vfsmount_groups, - vfsmount_group_list) { - /* insert in front of this one? */ - if (group < group_iter) { - /* list_add_tail() insert in front of group_iter */ - list_add_tail_rcu(&group->inode_group_list, - &group_iter->inode_group_list); - goto out; - } - } - - /* apparently we need to be the last entry */ - list_add_tail_rcu(&group->vfsmount_group_list, &fsnotify_vfsmount_groups); - } -out: - group->on_vfsmount_group_list = 1; - - mutex_unlock(&fsnotify_grp_mutex); -} - -void fsnotify_add_inode_group(struct fsnotify_group *group) -{ - struct fsnotify_group *group_iter; - - mutex_lock(&fsnotify_grp_mutex); - - /* add to global group list */ - if (!group->on_inode_group_list) { - list_for_each_entry(group_iter, &fsnotify_inode_groups, - inode_group_list) { - if (group < group_iter) { - /* list_add_tail() insert in front of group_iter */ - list_add_tail_rcu(&group->inode_group_list, - &group_iter->inode_group_list); - goto out; - } - } - - /* apparently we need to be the last entry */ - list_add_tail_rcu(&group->inode_group_list, &fsnotify_inode_groups); - } -out: - group->on_inode_group_list = 1; - - mutex_unlock(&fsnotify_grp_mutex); -} - /* * Final freeing of a group */ @@ -124,51 +63,12 @@ static void fsnotify_destroy_group(struct fsnotify_group *group) } /* - * Remove this group from the global list of groups that will get events - * this can be done even if there are still references and things still using - * this group. This just stops the group from getting new events. - */ -static void __fsnotify_evict_group(struct fsnotify_group *group) -{ - BUG_ON(!mutex_is_locked(&fsnotify_grp_mutex)); - - 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; -} - -/* - * Called when a group is no longer interested in getting events. This can be - * used if a group is misbehaving or if for some reason a group should no longer - * get any filesystem events. - */ -void fsnotify_evict_group(struct fsnotify_group *group) -{ - mutex_lock(&fsnotify_grp_mutex); - __fsnotify_evict_group(group); - mutex_unlock(&fsnotify_grp_mutex); -} - -/* * Drop a reference to a group. Free it if it's through. */ void fsnotify_put_group(struct fsnotify_group *group) { - if (!atomic_dec_and_mutex_lock(&group->refcnt, &fsnotify_grp_mutex)) - return; - - /* - * OK, now we know that there's no other users *and* we hold mutex, - * so no new references will appear - */ - __fsnotify_evict_group(group); - - mutex_unlock(&fsnotify_grp_mutex); - - fsnotify_destroy_group(group); + if (atomic_dec_and_test(&group->refcnt)) + fsnotify_destroy_group(group); } /* @@ -195,9 +95,6 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) init_waitqueue_head(&group->notification_waitq); 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->marks_list); diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 236f29b066e..325185e514b 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -223,15 +223,6 @@ int fsnotify_add_mark(struct fsnotify_mark *mark, BUG_ON(!inode && !mnt); /* - * if this group isn't being testing for inode type events we need - * to start testing - */ - if (inode && unlikely(list_empty(&group->inode_group_list))) - fsnotify_add_inode_group(group); - else if (mnt && unlikely(list_empty(&group->vfsmount_group_list))) - fsnotify_add_vfsmount_group(group); - - /* * LOCKING ORDER!!!! * mark->lock * group->mark_lock diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index c4e7aab8746..2e7cc8c2a15 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -109,17 +109,6 @@ struct fsnotify_ops { */ struct fsnotify_group { /* - * global list of all groups receiving events from fsnotify. - * anchored by fsnotify_inode_groups and protected by either fsnotify_grp_mutex - * or fsnotify_grp_srcu depending on write vs read. - */ - struct list_head inode_group_list; - /* - * same as above except anchored by fsnotify_vfsmount_groups - */ - struct list_head vfsmount_group_list; - - /* * How the refcnt is used is up to each group. When the refcnt hits 0 * fsnotify will clean up all of the resources associated with this group. * As an example, the dnotify group will always have a refcnt=1 and that @@ -145,10 +134,6 @@ struct fsnotify_group { * a group */ struct list_head marks_list; /* all inode marks for this group */ - /* prevents double list_del of group_list. protected by global fsnotify_grp_mutex */ - bool on_inode_group_list; - bool on_vfsmount_group_list; - /* groups can define private fields here or use the void *private */ union { void *private; |