configfs: switch ->default groups to a linked list
Replace the current NULL-terminated array of default groups with a linked
list. This gets rid of lots of nasty code to size and/or dynamically
allocate the array.
While we're at it also provide a conveniant helper to remove the default
groups.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felipe Balbi <balbi@kernel.org> [drivers/usb/gadget]
Acked-by: Joel Becker <jlbec@evilplan.org>
Acked-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
index f916d18..8caef31 100644
--- a/drivers/target/target_core_fabric_configfs.c
+++ b/drivers/target/target_core_fabric_configfs.c
@@ -273,18 +273,10 @@
struct se_portal_group *se_tpg = se_nacl->se_tpg;
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
struct se_lun_acl *lacl = NULL;
- struct config_item *acl_ci;
- struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
char *buf;
unsigned long long mapped_lun;
int ret = 0;
- acl_ci = &group->cg_item;
- if (!acl_ci) {
- pr_err("Unable to locatel acl_ci\n");
- return NULL;
- }
-
buf = kzalloc(strlen(name) + 1, GFP_KERNEL);
if (!buf) {
pr_err("Unable to allocate memory for name buf\n");
@@ -315,37 +307,19 @@
goto out;
}
- lacl_cg = &lacl->se_lun_group;
- lacl_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
- GFP_KERNEL);
- if (!lacl_cg->default_groups) {
- pr_err("Unable to allocate lacl_cg->default_groups\n");
- ret = -ENOMEM;
- goto out;
- }
-
config_group_init_type_name(&lacl->se_lun_group, name,
&tf->tf_tpg_mappedlun_cit);
+
config_group_init_type_name(&lacl->ml_stat_grps.stat_group,
"statistics", &tf->tf_tpg_mappedlun_stat_cit);
- lacl_cg->default_groups[0] = &lacl->ml_stat_grps.stat_group;
- lacl_cg->default_groups[1] = NULL;
+ configfs_add_default_group(&lacl->ml_stat_grps.stat_group,
+ &lacl->se_lun_group);
- ml_stat_grp = &lacl->ml_stat_grps.stat_group;
- ml_stat_grp->default_groups = kmalloc(sizeof(struct config_group *) * 3,
- GFP_KERNEL);
- if (!ml_stat_grp->default_groups) {
- pr_err("Unable to allocate ml_stat_grp->default_groups\n");
- ret = -ENOMEM;
- goto out;
- }
target_stat_setup_mappedlun_default_groups(lacl);
kfree(buf);
return &lacl->se_lun_group;
out:
- if (lacl_cg)
- kfree(lacl_cg->default_groups);
kfree(lacl);
kfree(buf);
return ERR_PTR(ret);
@@ -357,25 +331,9 @@
{
struct se_lun_acl *lacl = container_of(to_config_group(item),
struct se_lun_acl, se_lun_group);
- struct config_item *df_item;
- struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
- int i;
- ml_stat_grp = &lacl->ml_stat_grps.stat_group;
- for (i = 0; ml_stat_grp->default_groups[i]; i++) {
- df_item = &ml_stat_grp->default_groups[i]->cg_item;
- ml_stat_grp->default_groups[i] = NULL;
- config_item_put(df_item);
- }
- kfree(ml_stat_grp->default_groups);
-
- lacl_cg = &lacl->se_lun_group;
- for (i = 0; lacl_cg->default_groups[i]; i++) {
- df_item = &lacl_cg->default_groups[i]->cg_item;
- lacl_cg->default_groups[i] = NULL;
- config_item_put(df_item);
- }
- kfree(lacl_cg->default_groups);
+ configfs_remove_default_groups(&lacl->ml_stat_grps.stat_group);
+ configfs_remove_default_groups(&lacl->se_lun_group);
config_item_put(item);
}
@@ -424,7 +382,6 @@
struct se_portal_group, tpg_acl_group);
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
struct se_node_acl *se_nacl;
- struct config_group *nacl_cg;
se_nacl = core_tpg_add_initiator_node_acl(se_tpg, name);
if (IS_ERR(se_nacl))
@@ -438,24 +395,28 @@
}
}
- nacl_cg = &se_nacl->acl_group;
- nacl_cg->default_groups = se_nacl->acl_default_groups;
- nacl_cg->default_groups[0] = &se_nacl->acl_attrib_group;
- nacl_cg->default_groups[1] = &se_nacl->acl_auth_group;
- nacl_cg->default_groups[2] = &se_nacl->acl_param_group;
- nacl_cg->default_groups[3] = &se_nacl->acl_fabric_stat_group;
- nacl_cg->default_groups[4] = NULL;
-
config_group_init_type_name(&se_nacl->acl_group, name,
&tf->tf_tpg_nacl_base_cit);
+
config_group_init_type_name(&se_nacl->acl_attrib_group, "attrib",
&tf->tf_tpg_nacl_attrib_cit);
+ configfs_add_default_group(&se_nacl->acl_attrib_group,
+ &se_nacl->acl_group);
+
config_group_init_type_name(&se_nacl->acl_auth_group, "auth",
&tf->tf_tpg_nacl_auth_cit);
+ configfs_add_default_group(&se_nacl->acl_auth_group,
+ &se_nacl->acl_group);
+
config_group_init_type_name(&se_nacl->acl_param_group, "param",
&tf->tf_tpg_nacl_param_cit);
+ configfs_add_default_group(&se_nacl->acl_param_group,
+ &se_nacl->acl_group);
+
config_group_init_type_name(&se_nacl->acl_fabric_stat_group,
"fabric_statistics", &tf->tf_tpg_nacl_stat_cit);
+ configfs_add_default_group(&se_nacl->acl_fabric_stat_group,
+ &se_nacl->acl_group);
return &se_nacl->acl_group;
}
@@ -466,16 +427,9 @@
{
struct se_node_acl *se_nacl = container_of(to_config_group(item),
struct se_node_acl, acl_group);
- struct config_item *df_item;
- struct config_group *nacl_cg;
- int i;
- nacl_cg = &se_nacl->acl_group;
- for (i = 0; nacl_cg->default_groups[i]; i++) {
- df_item = &nacl_cg->default_groups[i]->cg_item;
- nacl_cg->default_groups[i] = NULL;
- config_item_put(df_item);
- }
+ configfs_remove_default_groups(&se_nacl->acl_group);
+
/*
* struct se_node_acl free is done in target_fabric_nacl_base_release()
*/
@@ -795,7 +749,6 @@
struct se_portal_group *se_tpg = container_of(group,
struct se_portal_group, tpg_lun_group);
struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
- struct config_group *lun_cg = NULL, *port_stat_grp = NULL;
unsigned long long unpacked_lun;
int errno;
@@ -812,31 +765,14 @@
if (IS_ERR(lun))
return ERR_CAST(lun);
- lun_cg = &lun->lun_group;
- lun_cg->default_groups = kmalloc(sizeof(struct config_group *) * 2,
- GFP_KERNEL);
- if (!lun_cg->default_groups) {
- pr_err("Unable to allocate lun_cg->default_groups\n");
- kfree(lun);
- return ERR_PTR(-ENOMEM);
- }
-
config_group_init_type_name(&lun->lun_group, name,
&tf->tf_tpg_port_cit);
+
config_group_init_type_name(&lun->port_stat_grps.stat_group,
"statistics", &tf->tf_tpg_port_stat_cit);
- lun_cg->default_groups[0] = &lun->port_stat_grps.stat_group;
- lun_cg->default_groups[1] = NULL;
+ configfs_add_default_group(&lun->port_stat_grps.stat_group,
+ &lun->lun_group);
- port_stat_grp = &lun->port_stat_grps.stat_group;
- port_stat_grp->default_groups = kzalloc(sizeof(struct config_group *) * 4,
- GFP_KERNEL);
- if (!port_stat_grp->default_groups) {
- pr_err("Unable to allocate port_stat_grp->default_groups\n");
- kfree(lun_cg->default_groups);
- kfree(lun);
- return ERR_PTR(-ENOMEM);
- }
target_stat_setup_port_default_groups(lun);
return &lun->lun_group;
@@ -848,25 +784,9 @@
{
struct se_lun *lun = container_of(to_config_group(item),
struct se_lun, lun_group);
- struct config_item *df_item;
- struct config_group *lun_cg, *port_stat_grp;
- int i;
- port_stat_grp = &lun->port_stat_grps.stat_group;
- for (i = 0; port_stat_grp->default_groups[i]; i++) {
- df_item = &port_stat_grp->default_groups[i]->cg_item;
- port_stat_grp->default_groups[i] = NULL;
- config_item_put(df_item);
- }
- kfree(port_stat_grp->default_groups);
-
- lun_cg = &lun->lun_group;
- for (i = 0; lun_cg->default_groups[i]; i++) {
- df_item = &lun_cg->default_groups[i]->cg_item;
- lun_cg->default_groups[i] = NULL;
- config_item_put(df_item);
- }
- kfree(lun_cg->default_groups);
+ configfs_remove_default_groups(&lun->port_stat_grps.stat_group);
+ configfs_remove_default_groups(&lun->lun_group);
config_item_put(item);
}
@@ -922,32 +842,39 @@
se_tpg = tf->tf_ops->fabric_make_tpg(wwn, group, name);
if (!se_tpg || IS_ERR(se_tpg))
return ERR_PTR(-EINVAL);
- /*
- * Setup default groups from pre-allocated se_tpg->tpg_default_groups
- */
- se_tpg->tpg_group.default_groups = se_tpg->tpg_default_groups;
- se_tpg->tpg_group.default_groups[0] = &se_tpg->tpg_lun_group;
- se_tpg->tpg_group.default_groups[1] = &se_tpg->tpg_np_group;
- se_tpg->tpg_group.default_groups[2] = &se_tpg->tpg_acl_group;
- se_tpg->tpg_group.default_groups[3] = &se_tpg->tpg_attrib_group;
- se_tpg->tpg_group.default_groups[4] = &se_tpg->tpg_auth_group;
- se_tpg->tpg_group.default_groups[5] = &se_tpg->tpg_param_group;
- se_tpg->tpg_group.default_groups[6] = NULL;
config_group_init_type_name(&se_tpg->tpg_group, name,
&tf->tf_tpg_base_cit);
+
config_group_init_type_name(&se_tpg->tpg_lun_group, "lun",
&tf->tf_tpg_lun_cit);
+ configfs_add_default_group(&se_tpg->tpg_lun_group,
+ &se_tpg->tpg_group);
+
config_group_init_type_name(&se_tpg->tpg_np_group, "np",
&tf->tf_tpg_np_cit);
+ configfs_add_default_group(&se_tpg->tpg_np_group,
+ &se_tpg->tpg_group);
+
config_group_init_type_name(&se_tpg->tpg_acl_group, "acls",
&tf->tf_tpg_nacl_cit);
+ configfs_add_default_group(&se_tpg->tpg_acl_group,
+ &se_tpg->tpg_group);
+
config_group_init_type_name(&se_tpg->tpg_attrib_group, "attrib",
&tf->tf_tpg_attrib_cit);
+ configfs_add_default_group(&se_tpg->tpg_attrib_group,
+ &se_tpg->tpg_group);
+
config_group_init_type_name(&se_tpg->tpg_auth_group, "auth",
&tf->tf_tpg_auth_cit);
+ configfs_add_default_group(&se_tpg->tpg_auth_group,
+ &se_tpg->tpg_group);
+
config_group_init_type_name(&se_tpg->tpg_param_group, "param",
&tf->tf_tpg_param_cit);
+ configfs_add_default_group(&se_tpg->tpg_param_group,
+ &se_tpg->tpg_group);
return &se_tpg->tpg_group;
}
@@ -958,19 +885,8 @@
{
struct se_portal_group *se_tpg = container_of(to_config_group(item),
struct se_portal_group, tpg_group);
- struct config_group *tpg_cg = &se_tpg->tpg_group;
- struct config_item *df_item;
- int i;
- /*
- * Release default groups, but do not release tpg_cg->default_groups
- * memory as it is statically allocated at se_tpg->tpg_default_groups.
- */
- for (i = 0; tpg_cg->default_groups[i]; i++) {
- df_item = &tpg_cg->default_groups[i]->cg_item;
- tpg_cg->default_groups[i] = NULL;
- config_item_put(df_item);
- }
+ configfs_remove_default_groups(&se_tpg->tpg_group);
config_item_put(item);
}
@@ -1026,16 +942,12 @@
return ERR_PTR(-EINVAL);
wwn->wwn_tf = tf;
- /*
- * Setup default groups from pre-allocated wwn->wwn_default_groups
- */
- wwn->wwn_group.default_groups = wwn->wwn_default_groups;
- wwn->wwn_group.default_groups[0] = &wwn->fabric_stat_group;
- wwn->wwn_group.default_groups[1] = NULL;
config_group_init_type_name(&wwn->wwn_group, name, &tf->tf_tpg_cit);
+
config_group_init_type_name(&wwn->fabric_stat_group, "fabric_statistics",
&tf->tf_wwn_fabric_stats_cit);
+ configfs_add_default_group(&wwn->fabric_stat_group, &wwn->wwn_group);
return &wwn->wwn_group;
}
@@ -1046,16 +958,8 @@
{
struct se_wwn *wwn = container_of(to_config_group(item),
struct se_wwn, wwn_group);
- struct config_item *df_item;
- struct config_group *cg = &wwn->wwn_group;
- int i;
- for (i = 0; cg->default_groups[i]; i++) {
- df_item = &cg->default_groups[i]->cg_item;
- cg->default_groups[i] = NULL;
- config_item_put(df_item);
- }
-
+ configfs_remove_default_groups(&wwn->wwn_group);
config_item_put(item);
}