diff --git a/Documentation/filesystems/configfs/configfs.txt b/Documentation/filesystems/configfs/configfs.txt index 15838d706ea2..44c97e6accb2 100644 --- a/Documentation/filesystems/configfs/configfs.txt +++ b/Documentation/filesystems/configfs/configfs.txt @@ -233,12 +233,10 @@ accomplished via the group operations specified on the group's 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 0b422acd470c..039648791701 100644 --- a/Documentation/filesystems/configfs/configfs_example.c +++ b/Documentation/filesystems/configfs/configfs_example.c @@ -273,13 +273,13 @@ static inline struct simple_children *to_simple_children(struct config_item *ite 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 @@ static int simple_children_make_item(struct config_group *group, const char *nam 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 @@ static struct configfs_subsystem simple_children_subsys = { * 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 387a13395015..e13966bb5f77 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -585,9 +585,8 @@ static struct config_item_type netconsole_target_type = { * 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 @@ static int make_netconsole_target(struct config_group *group, 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 @@ static int make_netconsole_target(struct config_group *group, 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 0e64312a084c..179589be063a 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -1027,9 +1027,10 @@ EXPORT_SYMBOL(configfs_undepend_item); 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 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 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 492d8caaaf25..c4e7d721bd8d 100644 --- a/fs/dlm/config.c +++ b/fs/dlm/config.c @@ -41,20 +41,16 @@ struct comm; 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 @@ static struct node *to_node(struct config_item *i) 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 @@ static int make_cluster(struct config_group *g, const char *name, 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 @@ static void release_cluster(struct config_item *i) 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 @@ static int make_space(struct config_group *g, const char *name, 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 @@ static void release_space(struct config_item *i) 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 @@ static void release_comm(struct config_item *i) 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 @@ static int make_node(struct config_group *g, const char *name, 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 443d108211ab..7dce1612553e 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -1489,31 +1489,22 @@ static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group : 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 b364b7052e46..816a3f61330c 100644 --- a/fs/ocfs2/cluster/nodemanager.c +++ b/fs/ocfs2/cluster/nodemanager.c @@ -644,35 +644,23 @@ static ssize_t o2nm_cluster_store(struct config_item *item, 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 @@ static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *gro } #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 @@ static int o2nm_cluster_group_make_group(struct config_group *group, 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 0488f937634a..d62c19ff041c 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -148,7 +148,8 @@ struct configfs_attribute { * 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_item_operations { }; 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);