target: simplify the target template registration API
Instead of calling target_fabric_configfs_init() +
target_fabric_configfs_register() / target_fabric_configfs_deregister()
target_fabric_configfs_free() from every target driver, rewrite the API
so that we have simple register/unregister functions that operate on
a const operations vector.
This patch also fixes a memory leak in several target drivers. Several
target drivers namely called target_fabric_configfs_deregister()
without calling target_fabric_configfs_free().
A large part of this patch is based on earlier changes from
Bart Van Assche <bart.vanassche@sandisk.com>.
(v2: Add a new TF_CIT_SETUP_DRV macro so that the core configfs code
can declare attributes as either core only or for drivers)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 69baf1c..ddaf76a 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -300,81 +300,17 @@
// Start functions called by external Target Fabrics Modules
//############################################################################*/
-/*
- * First function called by fabric modules to:
- *
- * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
- * 2) Add struct target_fabric_configfs to g_tf_list
- * 3) Return struct target_fabric_configfs to fabric module to be passed
- * into target_fabric_configfs_register().
- */
-struct target_fabric_configfs *target_fabric_configfs_init(
- struct module *fabric_mod,
- const char *name)
+static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
{
- struct target_fabric_configfs *tf;
-
- if (!(name)) {
- pr_err("Unable to locate passed fabric name\n");
- return ERR_PTR(-EINVAL);
+ if (!tfo->name) {
+ pr_err("Missing tfo->name\n");
+ return -EINVAL;
}
- if (strlen(name) >= TARGET_FABRIC_NAME_SIZE) {
+ if (strlen(tfo->name) >= TARGET_FABRIC_NAME_SIZE) {
pr_err("Passed name: %s exceeds TARGET_FABRIC"
- "_NAME_SIZE\n", name);
- return ERR_PTR(-EINVAL);
+ "_NAME_SIZE\n", tfo->name);
+ return -EINVAL;
}
-
- tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
- if (!tf)
- return ERR_PTR(-ENOMEM);
-
- INIT_LIST_HEAD(&tf->tf_list);
- atomic_set(&tf->tf_access_cnt, 0);
- /*
- * Setup the default generic struct config_item_type's (cits) in
- * struct target_fabric_configfs->tf_cit_tmpl
- */
- tf->tf_module = fabric_mod;
- target_fabric_setup_cits(tf);
-
- tf->tf_subsys = target_core_subsystem[0];
- snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);
-
- mutex_lock(&g_tf_lock);
- list_add_tail(&tf->tf_list, &g_tf_list);
- mutex_unlock(&g_tf_lock);
-
- pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
- ">>>>>>>>>>>>>>\n");
- pr_debug("Initialized struct target_fabric_configfs: %p for"
- " %s\n", tf, tf->tf_name);
- return tf;
-}
-EXPORT_SYMBOL(target_fabric_configfs_init);
-
-/*
- * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
- */
-void target_fabric_configfs_free(
- struct target_fabric_configfs *tf)
-{
- mutex_lock(&g_tf_lock);
- list_del(&tf->tf_list);
- mutex_unlock(&g_tf_lock);
-
- kfree(tf);
-}
-EXPORT_SYMBOL(target_fabric_configfs_free);
-
-/*
- * Perform a sanity check of the passed tf->tf_ops before completing
- * TCM fabric module registration.
- */
-static int target_fabric_tf_ops_check(
- struct target_fabric_configfs *tf)
-{
- struct target_core_fabric_ops *tfo = &tf->tf_ops;
-
if (!tfo->get_fabric_name) {
pr_err("Missing tfo->get_fabric_name()\n");
return -EINVAL;
@@ -508,77 +444,59 @@
return 0;
}
-/*
- * Called 2nd from fabric module with returned parameter of
- * struct target_fabric_configfs * from target_fabric_configfs_init().
- *
- * Upon a successful registration, the new fabric's struct config_item is
- * return. Also, a pointer to this struct is set in the passed
- * struct target_fabric_configfs.
- */
-int target_fabric_configfs_register(
- struct target_fabric_configfs *tf)
+int target_register_template(const struct target_core_fabric_ops *fo)
{
+ struct target_fabric_configfs *tf;
int ret;
- if (!tf) {
- pr_err("Unable to locate target_fabric_configfs"
- " pointer\n");
- return -EINVAL;
- }
- if (!tf->tf_subsys) {
- pr_err("Unable to target struct config_subsystem"
- " pointer\n");
- return -EINVAL;
- }
- ret = target_fabric_tf_ops_check(tf);
- if (ret < 0)
+ ret = target_fabric_tf_ops_check(fo);
+ if (ret)
return ret;
- pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
- ">>>>>>>>>>\n");
- return 0;
-}
-EXPORT_SYMBOL(target_fabric_configfs_register);
-
-void target_fabric_configfs_deregister(
- struct target_fabric_configfs *tf)
-{
- struct configfs_subsystem *su;
-
+ tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
if (!tf) {
- pr_err("Unable to locate passed target_fabric_"
- "configfs\n");
- return;
+ pr_err("%s: could not allocate memory!\n", __func__);
+ return -ENOMEM;
}
- su = tf->tf_subsys;
- if (!su) {
- pr_err("Unable to locate passed tf->tf_subsys"
- " pointer\n");
- return;
- }
- pr_debug("<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
- ">>>>>>>>>>>>\n");
+
+ INIT_LIST_HEAD(&tf->tf_list);
+ atomic_set(&tf->tf_access_cnt, 0);
+
+ /*
+ * Setup the default generic struct config_item_type's (cits) in
+ * struct target_fabric_configfs->tf_cit_tmpl
+ */
+ tf->tf_module = fo->module;
+ tf->tf_subsys = target_core_subsystem[0];
+ snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", fo->name);
+
+ tf->tf_ops = *fo;
+ target_fabric_setup_cits(tf);
+
mutex_lock(&g_tf_lock);
- if (atomic_read(&tf->tf_access_cnt)) {
- mutex_unlock(&g_tf_lock);
- pr_err("Non zero tf->tf_access_cnt for fabric %s\n",
- tf->tf_name);
- BUG();
- }
- list_del(&tf->tf_list);
+ list_add_tail(&tf->tf_list, &g_tf_list);
mutex_unlock(&g_tf_lock);
- pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
- " %s\n", tf->tf_name);
- tf->tf_module = NULL;
- tf->tf_subsys = NULL;
- kfree(tf);
-
- pr_debug("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
- ">>>>>\n");
+ return 0;
}
-EXPORT_SYMBOL(target_fabric_configfs_deregister);
+EXPORT_SYMBOL(target_register_template);
+
+void target_unregister_template(const struct target_core_fabric_ops *fo)
+{
+ struct target_fabric_configfs *t;
+
+ mutex_lock(&g_tf_lock);
+ list_for_each_entry(t, &g_tf_list, tf_list) {
+ if (!strcmp(t->tf_name, fo->name)) {
+ BUG_ON(atomic_read(&t->tf_access_cnt));
+ list_del(&t->tf_list);
+ kfree(t);
+ break;
+ }
+ }
+ mutex_unlock(&g_tf_lock);
+}
+EXPORT_SYMBOL(target_unregister_template);
/*##############################################################################
// Stop functions called by external Target Fabrics Modules
@@ -945,7 +863,7 @@
struct se_lun *lun;
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg;
- struct target_core_fabric_ops *tfo;
+ const struct target_core_fabric_ops *tfo;
ssize_t len = 0;
spin_lock(&dev->dev_reservation_lock);
@@ -979,7 +897,7 @@
static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
struct se_device *dev, char *page)
{
- struct target_core_fabric_ops *tfo;
+ const struct target_core_fabric_ops *tfo;
struct t10_pr_registration *pr_reg;
unsigned char buf[384];
char i_buf[PR_REG_ISID_ID_LEN];