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-rw-r--r--Documentation/filesystems/configfs/configfs.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/configfs/configfs.txt b/Documentation/filesystems/configfs/configfs.txt
index 21f038e6672..aef74cdecc2 100644
--- a/Documentation/filesystems/configfs/configfs.txt
+++ b/Documentation/filesystems/configfs/configfs.txt
@@ -238,6 +238,8 @@ config_item_type.
struct config_group *(*make_group)(struct config_group *group,
const char *name);
int (*commit_item)(struct config_item *item);
+ void (*disconnect_notify)(struct config_group *group,
+ struct config_item *item);
void (*drop_item)(struct config_group *group,
struct config_item *item);
};
@@ -268,6 +270,16 @@ the item in other threads, the memory is safe. It may take some time
for the item to actually disappear from the subsystem's usage. But it
is gone from configfs.
+When drop_item() is called, the item's linkage has already been torn
+down. It no longer has a reference on its parent and has no place in
+the item hierarchy. If a client needs to do some cleanup before this
+teardown happens, the subsystem can implement the
+ct_group_ops->disconnect_notify() method. The method is called after
+configfs has removed the item from the filesystem view but before the
+item is removed from its parent group. Like drop_item(),
+disconnect_notify() is void and cannot fail. Client subsystems should
+not drop any references here, as they still must do it in drop_item().
+
A config_group cannot be removed while it still has child items. This
is implemented in the configfs rmdir(2) code. ->drop_item() will not be
called, as the item has not been dropped. rmdir(2) will fail, as the