Merge branch 'configfs-fixup-ptr-error' of git://oss.oracle.com/git/jlbec/linux-2.6
* 'configfs-fixup-ptr-error' of git://oss.oracle.com/git/jlbec/linux-2.6:
configfs: Allow ->make_item() and ->make_group() to return detailed errors.
Revert "configfs: Allow ->make_item() and ->make_group() to return detailed errors."
diff --git a/Documentation/filesystems/configfs/configfs.txt b/Documentation/filesystems/configfs/configfs.txt
index 15838d7..44c97e6 100644
--- a/Documentation/filesystems/configfs/configfs.txt
+++ b/Documentation/filesystems/configfs/configfs.txt
@@ -233,12 +233,10 @@
config_item_type.
struct configfs_group_operations {
- int (*make_item)(struct config_group *group,
- const char *name,
- struct config_item **new_item);
- int (*make_group)(struct config_group *group,
- const char *name,
- struct config_group **new_group);
+ 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);
diff --git a/Documentation/filesystems/configfs/configfs_example.c b/Documentation/filesystems/configfs/configfs_example.c
index 0b422ac..03964879 100644
--- a/Documentation/filesystems/configfs/configfs_example.c
+++ b/Documentation/filesystems/configfs/configfs_example.c
@@ -273,13 +273,13 @@
return item ? container_of(to_config_group(item), struct simple_children, group) : NULL;
}
-static int simple_children_make_item(struct config_group *group, const char *name, struct config_item **new_item)
+static struct config_item *simple_children_make_item(struct config_group *group, const char *name)
{
struct simple_child *simple_child;
simple_child = kzalloc(sizeof(struct simple_child), GFP_KERNEL);
if (!simple_child)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
config_item_init_type_name(&simple_child->item, name,
@@ -287,8 +287,7 @@
simple_child->storeme = 0;
- *new_item = &simple_child->item;
- return 0;
+ return &simple_child->item;
}
static struct configfs_attribute simple_children_attr_description = {
@@ -360,21 +359,20 @@
* children of its own.
*/
-static int group_children_make_group(struct config_group *group, const char *name, struct config_group **new_group)
+static struct config_group *group_children_make_group(struct config_group *group, const char *name)
{
struct simple_children *simple_children;
simple_children = kzalloc(sizeof(struct simple_children),
GFP_KERNEL);
if (!simple_children)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
config_group_init_type_name(&simple_children->group, name,
&simple_children_type);
- *new_group = &simple_children->group;
- return 0;
+ return &simple_children->group;
}
static struct configfs_attribute group_children_attr_description = {
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 387a133..e13966b 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -585,9 +585,8 @@
* Group operations and type for netconsole_subsys.
*/
-static int make_netconsole_target(struct config_group *group,
- const char *name,
- struct config_item **new_item)
+static struct config_item *make_netconsole_target(struct config_group *group,
+ const char *name)
{
unsigned long flags;
struct netconsole_target *nt;
@@ -599,7 +598,7 @@
nt = kzalloc(sizeof(*nt), GFP_KERNEL);
if (!nt) {
printk(KERN_ERR "netconsole: failed to allocate memory\n");
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
}
nt->np.name = "netconsole";
@@ -616,8 +615,7 @@
list_add(&nt->list, &target_list);
spin_unlock_irqrestore(&target_list_lock, flags);
- *new_item = &nt->item;
- return 0;
+ return &nt->item;
}
static void drop_netconsole_target(struct config_group *group,
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 0e64312..179589b 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1027,9 +1027,10 @@
static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
- int ret, module_got = 0;
- struct config_group *group;
- struct config_item *item;
+ int ret = 0;
+ int module_got = 0;
+ struct config_group *group = NULL;
+ struct config_item *item = NULL;
struct config_item *parent_item;
struct configfs_subsystem *subsys;
struct configfs_dirent *sd;
@@ -1070,25 +1071,30 @@
snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name);
mutex_lock(&subsys->su_mutex);
- group = NULL;
- item = NULL;
if (type->ct_group_ops->make_group) {
- ret = type->ct_group_ops->make_group(to_config_group(parent_item), name, &group);
- if (!ret) {
+ group = type->ct_group_ops->make_group(to_config_group(parent_item), name);
+ if (!group)
+ group = ERR_PTR(-ENOMEM);
+ if (!IS_ERR(group)) {
link_group(to_config_group(parent_item), group);
item = &group->cg_item;
- }
+ } else
+ ret = PTR_ERR(group);
} else {
- ret = type->ct_group_ops->make_item(to_config_group(parent_item), name, &item);
- if (!ret)
+ item = type->ct_group_ops->make_item(to_config_group(parent_item), name);
+ if (!item)
+ item = ERR_PTR(-ENOMEM);
+ if (!IS_ERR(item))
link_obj(parent_item, item);
+ else
+ ret = PTR_ERR(item);
}
mutex_unlock(&subsys->su_mutex);
kfree(name);
if (ret) {
/*
- * If ret != 0, then link_obj() was never called.
+ * If item == NULL, then link_obj() was never called.
* There are no extra references to clean up.
*/
goto out_put;
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 492d8ca..c4e7d72 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -41,20 +41,16 @@
struct nodes;
struct node;
-static int make_cluster(struct config_group *, const char *,
- struct config_group **);
+static struct config_group *make_cluster(struct config_group *, const char *);
static void drop_cluster(struct config_group *, struct config_item *);
static void release_cluster(struct config_item *);
-static int make_space(struct config_group *, const char *,
- struct config_group **);
+static struct config_group *make_space(struct config_group *, const char *);
static void drop_space(struct config_group *, struct config_item *);
static void release_space(struct config_item *);
-static int make_comm(struct config_group *, const char *,
- struct config_item **);
+static struct config_item *make_comm(struct config_group *, const char *);
static void drop_comm(struct config_group *, struct config_item *);
static void release_comm(struct config_item *);
-static int make_node(struct config_group *, const char *,
- struct config_item **);
+static struct config_item *make_node(struct config_group *, const char *);
static void drop_node(struct config_group *, struct config_item *);
static void release_node(struct config_item *);
@@ -396,8 +392,8 @@
return i ? container_of(i, struct node, item) : NULL;
}
-static int make_cluster(struct config_group *g, const char *name,
- struct config_group **new_g)
+static struct config_group *make_cluster(struct config_group *g,
+ const char *name)
{
struct cluster *cl = NULL;
struct spaces *sps = NULL;
@@ -435,15 +431,14 @@
space_list = &sps->ss_group;
comm_list = &cms->cs_group;
- *new_g = &cl->group;
- return 0;
+ return &cl->group;
fail:
kfree(cl);
kfree(gps);
kfree(sps);
kfree(cms);
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
}
static void drop_cluster(struct config_group *g, struct config_item *i)
@@ -471,8 +466,7 @@
kfree(cl);
}
-static int make_space(struct config_group *g, const char *name,
- struct config_group **new_g)
+static struct config_group *make_space(struct config_group *g, const char *name)
{
struct space *sp = NULL;
struct nodes *nds = NULL;
@@ -495,14 +489,13 @@
INIT_LIST_HEAD(&sp->members);
mutex_init(&sp->members_lock);
sp->members_count = 0;
- *new_g = &sp->group;
- return 0;
+ return &sp->group;
fail:
kfree(sp);
kfree(gps);
kfree(nds);
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
}
static void drop_space(struct config_group *g, struct config_item *i)
@@ -529,21 +522,19 @@
kfree(sp);
}
-static int make_comm(struct config_group *g, const char *name,
- struct config_item **new_i)
+static struct config_item *make_comm(struct config_group *g, const char *name)
{
struct comm *cm;
cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
if (!cm)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
config_item_init_type_name(&cm->item, name, &comm_type);
cm->nodeid = -1;
cm->local = 0;
cm->addr_count = 0;
- *new_i = &cm->item;
- return 0;
+ return &cm->item;
}
static void drop_comm(struct config_group *g, struct config_item *i)
@@ -563,15 +554,14 @@
kfree(cm);
}
-static int make_node(struct config_group *g, const char *name,
- struct config_item **new_i)
+static struct config_item *make_node(struct config_group *g, const char *name)
{
struct space *sp = to_space(g->cg_item.ci_parent);
struct node *nd;
nd = kzalloc(sizeof(struct node), GFP_KERNEL);
if (!nd)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
config_item_init_type_name(&nd->item, name, &node_type);
nd->nodeid = -1;
@@ -583,8 +573,7 @@
sp->members_count++;
mutex_unlock(&sp->members_lock);
- *new_i = &nd->item;
- return 0;
+ return &nd->item;
}
static void drop_node(struct config_group *g, struct config_item *i)
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 443d108..7dce161 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1489,31 +1489,22 @@
: NULL;
}
-static int o2hb_heartbeat_group_make_item(struct config_group *group,
- const char *name,
- struct config_item **new_item)
+static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
+ const char *name)
{
struct o2hb_region *reg = NULL;
- int ret = 0;
reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL);
- if (reg == NULL) {
- ret = -ENOMEM;
- goto out;
- }
+ if (reg == NULL)
+ return ERR_PTR(-ENOMEM);
config_item_init_type_name(®->hr_item, name, &o2hb_region_type);
- *new_item = ®->hr_item;
-
spin_lock(&o2hb_live_lock);
list_add_tail(®->hr_all_item, &o2hb_all_regions);
spin_unlock(&o2hb_live_lock);
-out:
- if (ret)
- kfree(reg);
- return ret;
+ return ®->hr_item;
}
static void o2hb_heartbeat_group_drop_item(struct config_group *group,
diff --git a/fs/ocfs2/cluster/nodemanager.c b/fs/ocfs2/cluster/nodemanager.c
index b364b70..816a3f6 100644
--- a/fs/ocfs2/cluster/nodemanager.c
+++ b/fs/ocfs2/cluster/nodemanager.c
@@ -644,35 +644,23 @@
return ret;
}
-static int o2nm_node_group_make_item(struct config_group *group,
- const char *name,
- struct config_item **new_item)
+static struct config_item *o2nm_node_group_make_item(struct config_group *group,
+ const char *name)
{
struct o2nm_node *node = NULL;
- int ret = 0;
- if (strlen(name) > O2NM_MAX_NAME_LEN) {
- ret = -ENAMETOOLONG;
- goto out;
- }
+ if (strlen(name) > O2NM_MAX_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
node = kzalloc(sizeof(struct o2nm_node), GFP_KERNEL);
- if (node == NULL) {
- ret = -ENOMEM;
- goto out;
- }
+ if (node == NULL)
+ return ERR_PTR(-ENOMEM);
strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
spin_lock_init(&node->nd_lock);
- *new_item = &node->nd_item;
-
-out:
- if (ret)
- kfree(node);
-
- return ret;
+ return &node->nd_item;
}
static void o2nm_node_group_drop_item(struct config_group *group,
@@ -756,31 +744,25 @@
}
#endif
-static int o2nm_cluster_group_make_group(struct config_group *group,
- const char *name,
- struct config_group **new_group)
+static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
+ const char *name)
{
struct o2nm_cluster *cluster = NULL;
struct o2nm_node_group *ns = NULL;
- struct config_group *o2hb_group = NULL;
+ struct config_group *o2hb_group = NULL, *ret = NULL;
void *defs = NULL;
- int ret = 0;
/* this runs under the parent dir's i_mutex; there can be only
* one caller in here at a time */
- if (o2nm_single_cluster) {
- ret = -ENOSPC;
- goto out;
- }
+ if (o2nm_single_cluster)
+ return ERR_PTR(-ENOSPC);
cluster = kzalloc(sizeof(struct o2nm_cluster), GFP_KERNEL);
ns = kzalloc(sizeof(struct o2nm_node_group), GFP_KERNEL);
defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
o2hb_group = o2hb_alloc_hb_set();
- if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL) {
- ret = -ENOMEM;
+ if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
goto out;
- }
config_group_init_type_name(&cluster->cl_group, name,
&o2nm_cluster_type);
@@ -797,15 +779,16 @@
cluster->cl_idle_timeout_ms = O2NET_IDLE_TIMEOUT_MS_DEFAULT;
cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT;
- *new_group = &cluster->cl_group;
+ ret = &cluster->cl_group;
o2nm_single_cluster = cluster;
out:
- if (ret) {
+ if (ret == NULL) {
kfree(cluster);
kfree(ns);
o2hb_free_hb_set(o2hb_group);
kfree(defs);
+ ret = ERR_PTR(-ENOMEM);
}
return ret;
diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index 0488f93..d62c19f 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -148,7 +148,8 @@
* items. If the item is a group, it may support mkdir(2).
* Groups supply one of make_group() and make_item(). If the
* group supports make_group(), one can create group children. If it
- * supports make_item(), one can create config_item children. If it has
+ * supports make_item(), one can create config_item children. make_group()
+ * and make_item() return ERR_PTR() on errors. If it has
* default_groups on group->default_groups, it has automatically created
* group children. default_groups may coexist alongsize make_group() or
* make_item(), but if the group wishes to have only default_groups
@@ -165,8 +166,8 @@
};
struct configfs_group_operations {
- int (*make_item)(struct config_group *group, const char *name, struct config_item **new_item);
- int (*make_group)(struct config_group *group, const char *name, struct config_group **new_group);
+ 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);