We don't want to hardcode default groups at subsystem
creation time. Thus, we export:
* configfs_register_group
* configfs_unregister_group
that allows drivers to programatically create/destroy groups.
Signed-off-by: Daniel Baluta <daniel.bal...@intel.com>
---
I am not sure about the locking scheme here, Joel can you help? :)
fs/configfs/dir.c | 39 +++++++++++++++++++++++++++++++++++++--
include/linux/configfs.h | 4 ++++
2 files changed, 41 insertions(+), 2 deletions(-)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index c81ce7f..dde3251 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -651,7 +651,8 @@ static void detach_groups(struct config_group *group)
* try using vfs_mkdir. Just a thought.
*/
static int create_default_group(struct config_group *parent_group,
- struct config_group *group)
+ struct config_group *group,
+ struct dentry **dentry)
{
int ret;
struct configfs_dirent *sd;
@@ -671,6 +672,8 @@ static int create_default_group(struct config_group
*parent_group,
if (!ret) {
sd = child->d_fsdata;
sd->s_type |= CONFIGFS_USET_DEFAULT;
+ if (dentry)
+ *dentry = child;
} else {
BUG_ON(d_inode(child));
d_drop(child);
@@ -691,7 +694,7 @@ static int populate_groups(struct config_group *group)
for (i = 0; group->default_groups[i]; i++) {
new_group = group->default_groups[i];
- ret = create_default_group(group, new_group);
+ ret = create_default_group(group, new_group, NULL);
if (ret) {
detach_groups(group);
break;
@@ -1636,6 +1639,38 @@ const struct file_operations configfs_dir_operations = {
.iterate = configfs_readdir,
};
+int configfs_register_group(struct config_group *parent_group,
+ struct config_group *group)
+{
+ struct dentry *dentry;
+ int ret;
+
+ link_group(parent_group, group);
+
+ ret = create_default_group(parent_group, group, &dentry);
+ if (ret == 0)
+ configfs_dir_set_ready(dentry->d_fsdata);
+
+ return ret;
+}
+EXPORT_SYMBOL(configfs_register_group);
+
+void configfs_unregister_group(struct config_group *group)
+{
+ struct dentry *dentry = group->cg_item.ci_dentry;
+
+ mutex_lock(&d_inode(dentry)->i_mutex);
+ configfs_detach_group(&group->cg_item);
+ d_inode(dentry)->i_flags |= S_DEAD;
+ dont_mount(dentry);
+ mutex_unlock(&d_inode(dentry)->i_mutex);
+
+ d_delete(dentry);
+ dput(dentry);
+ unlink_group(group);
+}
+EXPORT_SYMBOL(configfs_unregister_group);
+
int configfs_register_subsystem(struct configfs_subsystem *subsys)
{
int err;
diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index c9e5c57..726980e 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -251,6 +251,10 @@ static inline struct configfs_subsystem
*to_configfs_subsystem(struct config_gro
int configfs_register_subsystem(struct configfs_subsystem *subsys);
void configfs_unregister_subsystem(struct configfs_subsystem *subsys);
+int configfs_register_group(struct config_group *parent_group,
+ struct config_group *group);
+void configfs_unregister_group(struct config_group *group);
+
/* These functions can sleep and can alloc with GFP_KERNEL */
/* WARNING: These cannot be called underneath configfs callbacks!! */
int configfs_depend_item(struct configfs_subsystem *subsys, struct config_item
*target);
--
2.1.4
--
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