[PATCH] configfs: remove the unused disconnect_notify callback

From: Christoph Hellwig
Date: Fri Feb 26 2016 - 07:38:42 EST


This callback was introduced a long time ago, but never actually used.

Remove the dead code.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
Documentation/filesystems/configfs/configfs.txt | 10 +---------
fs/configfs/dir.c | 25 -------------------------
include/linux/configfs.h | 1 -
3 files changed, 1 insertion(+), 35 deletions(-)

diff --git a/Documentation/filesystems/configfs/configfs.txt b/Documentation/filesystems/configfs/configfs.txt
index 8ec9136..7e25ea3 100644
--- a/Documentation/filesystems/configfs/configfs.txt
+++ b/Documentation/filesystems/configfs/configfs.txt
@@ -272,8 +272,6 @@ 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);
};
@@ -306,13 +304,7 @@ 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().
+the item hierarchy.

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
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index b51ce67..6f31462c 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -895,28 +895,6 @@ static void configfs_detach_group(struct config_item *item)
}

/*
- * After the item has been detached from the filesystem view, we are
- * ready to tear it out of the hierarchy. Notify the client before
- * we do that so they can perform any cleanup that requires
- * navigating the hierarchy. A client does not need to provide this
- * callback. The subsystem semaphore MUST be held by the caller, and
- * references must be valid for both items. It also assumes the
- * caller has validated ci_type.
- */
-static void client_disconnect_notify(struct config_item *parent_item,
- struct config_item *item)
-{
- struct config_item_type *type;
-
- type = parent_item->ci_type;
- BUG_ON(!type);
-
- if (type->ct_group_ops && type->ct_group_ops->disconnect_notify)
- type->ct_group_ops->disconnect_notify(to_config_group(parent_item),
- item);
-}
-
-/*
* Drop the initial reference from make_item()/make_group()
* This function assumes that reference is held on item
* and that item holds a valid reference to the parent. Also, it
@@ -1402,7 +1380,6 @@ out_unlink:
/* Tear down everything we built up */
mutex_lock(&subsys->su_mutex);

- client_disconnect_notify(parent_item, item);
if (group)
unlink_group(group);
else
@@ -1506,13 +1483,11 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
configfs_detach_group(item);

mutex_lock(&subsys->su_mutex);
- client_disconnect_notify(parent_item, item);
unlink_group(to_config_group(item));
} else {
configfs_detach_item(item);

mutex_lock(&subsys->su_mutex);
- client_disconnect_notify(parent_item, item);
unlink_obj(item);
}

diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index 485fe55..7dd0e8a 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -235,7 +235,6 @@ struct configfs_group_operations {
struct config_item *(*make_item)(struct config_group *group, const char *name);
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);
};

--
2.1.4