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authorEric Paris <eparis@redhat.com>2009-12-17 21:24:34 -0500
committerEric Paris <eparis@redhat.com>2010-07-28 09:59:01 -0400
commit6e5f77b32e9097a8a68a8d453799676cacf70cad (patch)
tree2a0211ecd5d79648e74fdf9f851a0669c5e4cc8a
parentcb2d429faf2cae62d3c51e28099a181d5fe8c244 (diff)
fsnotify: intoduce a notification merge argument
Each group can define their own notification (and secondary_q) merge function. Inotify does tail drop, fanotify does matching and drop which can actually allocate a completely new event. But for fanotify to properly deal with permissions events it needs to know the new event which was ultimately added to the notification queue. This patch just implements a void ** argument which is passed to the merge function. fanotify can use this field to pass the new event back to higher layers. Signed-off-by: Eric Paris <eparis@redhat.com> for fanotify to properly deal with permissions events
-rw-r--r--fs/notify/fanotify/fanotify.c6
-rw-r--r--fs/notify/inotify/inotify_fsnotify.c6
-rw-r--r--fs/notify/inotify/inotify_user.c2
-rw-r--r--fs/notify/notification.c7
-rw-r--r--include/linux/fsnotify_backend.h5
5 files changed, 18 insertions, 8 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 060b177146e..95a330d2f8a 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -27,7 +27,9 @@ static bool should_merge(struct fsnotify_event *old, struct fsnotify_event *new)
return false;
}
-static int fanotify_merge(struct list_head *list, struct fsnotify_event *event)
+static int fanotify_merge(struct list_head *list,
+ struct fsnotify_event *event,
+ void **arg)
{
struct fsnotify_event_holder *test_holder;
struct fsnotify_event *test_event;
@@ -92,7 +94,7 @@ static int fanotify_handle_event(struct fsnotify_group *group, struct fsnotify_e
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
- ret = fsnotify_add_notify_event(group, event, NULL, fanotify_merge);
+ ret = fsnotify_add_notify_event(group, event, NULL, fanotify_merge, NULL);
/* -EEXIST means this event was merged with another, not that it was an error */
if (ret == -EEXIST)
ret = 0;
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 1d237e1bf7b..daa666a6e6c 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -67,7 +67,9 @@ static bool event_compare(struct fsnotify_event *old, struct fsnotify_event *new
return false;
}
-static int inotify_merge(struct list_head *list, struct fsnotify_event *event)
+static int inotify_merge(struct list_head *list,
+ struct fsnotify_event *event,
+ void **arg)
{
struct fsnotify_event_holder *last_holder;
struct fsnotify_event *last_event;
@@ -114,7 +116,7 @@ static int inotify_handle_event(struct fsnotify_group *group, struct fsnotify_ev
fsn_event_priv->group = group;
event_priv->wd = wd;
- ret = fsnotify_add_notify_event(group, event, fsn_event_priv, inotify_merge);
+ ret = fsnotify_add_notify_event(group, event, fsn_event_priv, inotify_merge, NULL);
if (ret) {
inotify_free_event_priv(fsn_event_priv);
/* EEXIST says we tail matched, EOVERFLOW isn't something
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 19d274057bf..1ce71f5b958 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -525,7 +525,7 @@ void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
fsn_event_priv->group = group;
event_priv->wd = i_mark->wd;
- ret = fsnotify_add_notify_event(group, ignored_event, fsn_event_priv, NULL);
+ ret = fsnotify_add_notify_event(group, ignored_event, fsn_event_priv, NULL, NULL);
if (ret)
inotify_free_event_priv(fsn_event_priv);
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index 7fc8d004084..2d50a40ab1e 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -137,7 +137,10 @@ struct fsnotify_event_private_data *fsnotify_remove_priv_from_event(struct fsnot
*/
int fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_event *event,
struct fsnotify_event_private_data *priv,
- int (*merge)(struct list_head *, struct fsnotify_event *))
+ int (*merge)(struct list_head *,
+ struct fsnotify_event *,
+ void **arg),
+ void **arg)
{
struct fsnotify_event_holder *holder = NULL;
struct list_head *list = &group->notification_list;
@@ -170,7 +173,7 @@ alloc_holder:
if (!list_empty(list) && merge) {
int ret;
- ret = merge(list, event);
+ ret = merge(list, event, arg);
if (ret) {
mutex_unlock(&group->notification_mutex);
if (holder != &event->holder)
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 8b2e095e590..afc69019297 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -355,7 +355,10 @@ extern struct fsnotify_event_private_data *fsnotify_remove_priv_from_event(struc
extern int fsnotify_add_notify_event(struct fsnotify_group *group,
struct fsnotify_event *event,
struct fsnotify_event_private_data *priv,
- int (*merge)(struct list_head *, struct fsnotify_event *));
+ int (*merge)(struct list_head *,
+ struct fsnotify_event *,
+ void **),
+ void **arg);
/* true if the group notification queue is empty */
extern bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group);
/* return, but do not dequeue the first event on the notification queue */