blob: 66c6f8e72a02f9d27062dc5bead4bbb127d48a88 [file] [log] [blame]
/*
* fs/sdcardfs/packagelist.c
*
* Copyright (c) 2013 Samsung Electronics Co. Ltd
* Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
* Sunghwan Yun, Sungjong Seo
*
* This program has been developed as a stackable file system based on
* the WrapFS which written by
*
* Copyright (c) 1998-2011 Erez Zadok
* Copyright (c) 2009 Shrikar Archak
* Copyright (c) 2003-2011 Stony Brook University
* Copyright (c) 2003-2011 The Research Foundation of SUNY
*
* This file is dual licensed. It may be redistributed and/or modified
* under the terms of the Apache 2.0 License OR version 2 of the GNU
* General Public License.
*/
#include "sdcardfs.h"
#include <linux/hashtable.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/radix-tree.h>
#include <linux/dcache.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/configfs.h>
struct hashtable_entry {
struct hlist_node hlist;
struct hlist_node dlist; /* for deletion cleanup */
struct qstr key;
atomic_t value;
};
static DEFINE_HASHTABLE(package_to_appid, 8);
static DEFINE_HASHTABLE(package_to_userid, 8);
static DEFINE_HASHTABLE(ext_to_groupid, 8);
static struct kmem_cache *hashtable_entry_cachep;
static unsigned int full_name_case_hash(const unsigned char *name, unsigned int len)
{
unsigned long hash = init_name_hash();
while (len--)
hash = partial_name_hash(tolower(*name++), hash);
return end_name_hash(hash);
}
static inline void qstr_init(struct qstr *q, const char *name)
{
q->name = name;
q->len = strlen(q->name);
q->hash = full_name_case_hash(q->name, q->len);
}
static inline int qstr_copy(const struct qstr *src, struct qstr *dest)
{
dest->name = kstrdup(src->name, GFP_KERNEL);
dest->hash_len = src->hash_len;
return !!dest->name;
}
static appid_t __get_appid(const struct qstr *key)
{
struct hashtable_entry *hash_cur;
unsigned int hash = key->hash;
appid_t ret_id;
rcu_read_lock();
hash_for_each_possible_rcu(package_to_appid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key)) {
ret_id = atomic_read(&hash_cur->value);
rcu_read_unlock();
return ret_id;
}
}
rcu_read_unlock();
return 0;
}
appid_t get_appid(const char *key)
{
struct qstr q;
qstr_init(&q, key);
return __get_appid(&q);
}
static appid_t __get_ext_gid(const struct qstr *key)
{
struct hashtable_entry *hash_cur;
unsigned int hash = key->hash;
appid_t ret_id;
rcu_read_lock();
hash_for_each_possible_rcu(ext_to_groupid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key)) {
ret_id = atomic_read(&hash_cur->value);
rcu_read_unlock();
return ret_id;
}
}
rcu_read_unlock();
return 0;
}
appid_t get_ext_gid(const char *key)
{
struct qstr q;
qstr_init(&q, key);
return __get_ext_gid(&q);
}
static appid_t __is_excluded(const struct qstr *app_name, userid_t user)
{
struct hashtable_entry *hash_cur;
unsigned int hash = app_name->hash;
rcu_read_lock();
hash_for_each_possible_rcu(package_to_userid, hash_cur, hlist, hash) {
if (atomic_read(&hash_cur->value) == user &&
qstr_case_eq(app_name, &hash_cur->key)) {
rcu_read_unlock();
return 1;
}
}
rcu_read_unlock();
return 0;
}
appid_t is_excluded(const char *key, userid_t user)
{
struct qstr q;
qstr_init(&q, key);
return __is_excluded(&q, user);
}
/* Kernel has already enforced everything we returned through
* derive_permissions_locked(), so this is used to lock down access
* even further, such as enforcing that apps hold sdcard_rw.
*/
int check_caller_access_to_name(struct inode *parent_node, const struct qstr *name)
{
struct qstr q_autorun = QSTR_LITERAL("autorun.inf");
struct qstr q__android_secure = QSTR_LITERAL(".android_secure");
struct qstr q_android_secure = QSTR_LITERAL("android_secure");
/* Always block security-sensitive files at root */
if (parent_node && SDCARDFS_I(parent_node)->data->perm == PERM_ROOT) {
if (qstr_case_eq(name, &q_autorun)
|| qstr_case_eq(name, &q__android_secure)
|| qstr_case_eq(name, &q_android_secure)) {
return 0;
}
}
/* Root always has access; access for any other UIDs should always
* be controlled through packages.list.
*/
if (from_kuid(&init_user_ns, current_fsuid()) == 0)
return 1;
/* No extra permissions to enforce */
return 1;
}
static struct hashtable_entry *alloc_hashtable_entry(const struct qstr *key,
appid_t value)
{
struct hashtable_entry *ret = kmem_cache_alloc(hashtable_entry_cachep,
GFP_KERNEL);
if (!ret)
return NULL;
INIT_HLIST_NODE(&ret->dlist);
INIT_HLIST_NODE(&ret->hlist);
if (!qstr_copy(key, &ret->key)) {
kmem_cache_free(hashtable_entry_cachep, ret);
return NULL;
}
atomic_set(&ret->value, value);
return ret;
}
static int insert_packagelist_appid_entry_locked(const struct qstr *key, appid_t value)
{
struct hashtable_entry *hash_cur;
struct hashtable_entry *new_entry;
unsigned int hash = key->hash;
hash_for_each_possible_rcu(package_to_appid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key)) {
atomic_set(&hash_cur->value, value);
return 0;
}
}
new_entry = alloc_hashtable_entry(key, value);
if (!new_entry)
return -ENOMEM;
hash_add_rcu(package_to_appid, &new_entry->hlist, hash);
return 0;
}
static int insert_ext_gid_entry_locked(const struct qstr *key, appid_t value)
{
struct hashtable_entry *hash_cur;
struct hashtable_entry *new_entry;
unsigned int hash = key->hash;
/* An extension can only belong to one gid */
hash_for_each_possible_rcu(ext_to_groupid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key))
return -EINVAL;
}
new_entry = alloc_hashtable_entry(key, value);
if (!new_entry)
return -ENOMEM;
hash_add_rcu(ext_to_groupid, &new_entry->hlist, hash);
return 0;
}
static int insert_userid_exclude_entry_locked(const struct qstr *key, userid_t value)
{
struct hashtable_entry *hash_cur;
struct hashtable_entry *new_entry;
unsigned int hash = key->hash;
/* Only insert if not already present */
hash_for_each_possible_rcu(package_to_userid, hash_cur, hlist, hash) {
if (atomic_read(&hash_cur->value) == value &&
qstr_case_eq(key, &hash_cur->key))
return 0;
}
new_entry = alloc_hashtable_entry(key, value);
if (!new_entry)
return -ENOMEM;
hash_add_rcu(package_to_userid, &new_entry->hlist, hash);
return 0;
}
static void fixup_all_perms_name(const struct qstr *key)
{
struct sdcardfs_sb_info *sbinfo;
struct limit_search limit = {
.flags = BY_NAME,
.name = QSTR_INIT(key->name, key->len),
};
list_for_each_entry(sbinfo, &sdcardfs_super_list, list) {
if (sbinfo_has_sdcard_magic(sbinfo))
fixup_perms_recursive(sbinfo->sb->s_root, &limit);
}
}
static void fixup_all_perms_name_userid(const struct qstr *key, userid_t userid)
{
struct sdcardfs_sb_info *sbinfo;
struct limit_search limit = {
.flags = BY_NAME | BY_USERID,
.name = QSTR_INIT(key->name, key->len),
.userid = userid,
};
list_for_each_entry(sbinfo, &sdcardfs_super_list, list) {
if (sbinfo_has_sdcard_magic(sbinfo))
fixup_perms_recursive(sbinfo->sb->s_root, &limit);
}
}
static void fixup_all_perms_userid(userid_t userid)
{
struct sdcardfs_sb_info *sbinfo;
struct limit_search limit = {
.flags = BY_USERID,
.userid = userid,
};
list_for_each_entry(sbinfo, &sdcardfs_super_list, list) {
if (sbinfo_has_sdcard_magic(sbinfo))
fixup_perms_recursive(sbinfo->sb->s_root, &limit);
}
}
static int insert_packagelist_entry(const struct qstr *key, appid_t value)
{
int err;
mutex_lock(&sdcardfs_super_list_lock);
err = insert_packagelist_appid_entry_locked(key, value);
if (!err)
fixup_all_perms_name(key);
mutex_unlock(&sdcardfs_super_list_lock);
return err;
}
static int insert_ext_gid_entry(const struct qstr *key, appid_t value)
{
int err;
mutex_lock(&sdcardfs_super_list_lock);
err = insert_ext_gid_entry_locked(key, value);
mutex_unlock(&sdcardfs_super_list_lock);
return err;
}
static int insert_userid_exclude_entry(const struct qstr *key, userid_t value)
{
int err;
mutex_lock(&sdcardfs_super_list_lock);
err = insert_userid_exclude_entry_locked(key, value);
if (!err)
fixup_all_perms_name_userid(key, value);
mutex_unlock(&sdcardfs_super_list_lock);
return err;
}
static void free_hashtable_entry(struct hashtable_entry *entry)
{
kfree(entry->key.name);
kmem_cache_free(hashtable_entry_cachep, entry);
}
static void remove_packagelist_entry_locked(const struct qstr *key)
{
struct hashtable_entry *hash_cur;
unsigned int hash = key->hash;
struct hlist_node *h_t;
HLIST_HEAD(free_list);
hash_for_each_possible_rcu(package_to_userid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key)) {
hash_del_rcu(&hash_cur->hlist);
hlist_add_head(&hash_cur->dlist, &free_list);
}
}
hash_for_each_possible_rcu(package_to_appid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key)) {
hash_del_rcu(&hash_cur->hlist);
hlist_add_head(&hash_cur->dlist, &free_list);
break;
}
}
synchronize_rcu();
hlist_for_each_entry_safe(hash_cur, h_t, &free_list, dlist)
free_hashtable_entry(hash_cur);
}
static void remove_packagelist_entry(const struct qstr *key)
{
mutex_lock(&sdcardfs_super_list_lock);
remove_packagelist_entry_locked(key);
fixup_all_perms_name(key);
mutex_unlock(&sdcardfs_super_list_lock);
}
static void remove_ext_gid_entry_locked(const struct qstr *key, gid_t group)
{
struct hashtable_entry *hash_cur;
unsigned int hash = key->hash;
hash_for_each_possible_rcu(ext_to_groupid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key) && atomic_read(&hash_cur->value) == group) {
hash_del_rcu(&hash_cur->hlist);
synchronize_rcu();
free_hashtable_entry(hash_cur);
break;
}
}
}
static void remove_ext_gid_entry(const struct qstr *key, gid_t group)
{
mutex_lock(&sdcardfs_super_list_lock);
remove_ext_gid_entry_locked(key, group);
mutex_unlock(&sdcardfs_super_list_lock);
}
static void remove_userid_all_entry_locked(userid_t userid)
{
struct hashtable_entry *hash_cur;
struct hlist_node *h_t;
HLIST_HEAD(free_list);
int i;
hash_for_each_rcu(package_to_userid, i, hash_cur, hlist) {
if (atomic_read(&hash_cur->value) == userid) {
hash_del_rcu(&hash_cur->hlist);
hlist_add_head(&hash_cur->dlist, &free_list);
}
}
synchronize_rcu();
hlist_for_each_entry_safe(hash_cur, h_t, &free_list, dlist) {
free_hashtable_entry(hash_cur);
}
}
static void remove_userid_all_entry(userid_t userid)
{
mutex_lock(&sdcardfs_super_list_lock);
remove_userid_all_entry_locked(userid);
fixup_all_perms_userid(userid);
mutex_unlock(&sdcardfs_super_list_lock);
}
static void remove_userid_exclude_entry_locked(const struct qstr *key, userid_t userid)
{
struct hashtable_entry *hash_cur;
unsigned int hash = key->hash;
hash_for_each_possible_rcu(package_to_userid, hash_cur, hlist, hash) {
if (qstr_case_eq(key, &hash_cur->key) &&
atomic_read(&hash_cur->value) == userid) {
hash_del_rcu(&hash_cur->hlist);
synchronize_rcu();
free_hashtable_entry(hash_cur);
break;
}
}
}
static void remove_userid_exclude_entry(const struct qstr *key, userid_t userid)
{
mutex_lock(&sdcardfs_super_list_lock);
remove_userid_exclude_entry_locked(key, userid);
fixup_all_perms_name_userid(key, userid);
mutex_unlock(&sdcardfs_super_list_lock);
}
static void packagelist_destroy(void)
{
struct hashtable_entry *hash_cur;
struct hlist_node *h_t;
HLIST_HEAD(free_list);
int i;
mutex_lock(&sdcardfs_super_list_lock);
hash_for_each_rcu(package_to_appid, i, hash_cur, hlist) {
hash_del_rcu(&hash_cur->hlist);
hlist_add_head(&hash_cur->dlist, &free_list);
}
hash_for_each_rcu(package_to_userid, i, hash_cur, hlist) {
hash_del_rcu(&hash_cur->hlist);
hlist_add_head(&hash_cur->dlist, &free_list);
}
synchronize_rcu();
hlist_for_each_entry_safe(hash_cur, h_t, &free_list, dlist)
free_hashtable_entry(hash_cur);
mutex_unlock(&sdcardfs_super_list_lock);
pr_info("sdcardfs: destroyed packagelist pkgld\n");
}
#define SDCARDFS_CONFIGFS_ATTR(_pfx, _name) \
static struct configfs_attribute _pfx##attr_##_name = { \
.ca_name = __stringify(_name), \
.ca_mode = S_IRUGO | S_IWUGO, \
.ca_owner = THIS_MODULE, \
.show = _pfx##_name##_show, \
.store = _pfx##_name##_store, \
}
#define SDCARDFS_CONFIGFS_ATTR_RO(_pfx, _name) \
static struct configfs_attribute _pfx##attr_##_name = { \
.ca_name = __stringify(_name), \
.ca_mode = S_IRUGO, \
.ca_owner = THIS_MODULE, \
.show = _pfx##_name##_show, \
}
#define SDCARDFS_CONFIGFS_ATTR_WO(_pfx, _name) \
static struct configfs_attribute _pfx##attr_##_name = { \
.ca_name = __stringify(_name), \
.ca_mode = S_IWUGO, \
.ca_owner = THIS_MODULE, \
.store = _pfx##_name##_store, \
}
struct package_details {
struct config_item item;
struct qstr name;
};
static inline struct package_details *to_package_details(struct config_item *item)
{
return item ? container_of(item, struct package_details, item) : NULL;
}
static ssize_t package_details_appid_show(struct config_item *item, char *page)
{
return scnprintf(page, PAGE_SIZE, "%u\n", __get_appid(&to_package_details(item)->name));
}
static ssize_t package_details_appid_store(struct config_item *item,
const char *page, size_t count)
{
unsigned int tmp;
int ret;
ret = kstrtouint(page, 10, &tmp);
if (ret)
return ret;
ret = insert_packagelist_entry(&to_package_details(item)->name, tmp);
if (ret)
return ret;
return count;
}
static ssize_t package_details_excluded_userids_show(struct config_item *item,
char *page)
{
struct package_details *package_details = to_package_details(item);
struct hashtable_entry *hash_cur;
unsigned int hash = package_details->name.hash;
int count = 0;
rcu_read_lock();
hash_for_each_possible_rcu(package_to_userid, hash_cur, hlist, hash) {
if (qstr_case_eq(&package_details->name, &hash_cur->key))
count += scnprintf(page + count, PAGE_SIZE - count,
"%d ", atomic_read(&hash_cur->value));
}
rcu_read_unlock();
if (count)
count--;
count += scnprintf(page + count, PAGE_SIZE - count, "\n");
return count;
}
static ssize_t package_details_excluded_userids_store(struct config_item *item,
const char *page, size_t count)
{
unsigned int tmp;
int ret;
ret = kstrtouint(page, 10, &tmp);
if (ret)
return ret;
ret = insert_userid_exclude_entry(&to_package_details(item)->name, tmp);
if (ret)
return ret;
return count;
}
static ssize_t package_details_clear_userid_store(struct config_item *item,
const char *page, size_t count)
{
unsigned int tmp;
int ret;
ret = kstrtouint(page, 10, &tmp);
if (ret)
return ret;
remove_userid_exclude_entry(&to_package_details(item)->name, tmp);
return count;
}
static void package_details_release(struct config_item *item)
{
struct package_details *package_details = to_package_details(item);
pr_info("sdcardfs: removing %s\n", package_details->name.name);
remove_packagelist_entry(&package_details->name);
kfree(package_details->name.name);
kfree(package_details);
}
SDCARDFS_CONFIGFS_ATTR(package_details_, appid);
SDCARDFS_CONFIGFS_ATTR(package_details_, excluded_userids);
SDCARDFS_CONFIGFS_ATTR_WO(package_details_, clear_userid);
static struct configfs_attribute *package_details_attrs[] = {
&package_details_attr_appid,
&package_details_attr_excluded_userids,
&package_details_attr_clear_userid,
NULL,
};
static struct configfs_item_operations package_details_item_ops = {
.release = package_details_release,
};
static struct config_item_type package_appid_type = {
.ct_item_ops = &package_details_item_ops,
.ct_attrs = package_details_attrs,
.ct_owner = THIS_MODULE,
};
struct extensions_value {
struct config_group group;
unsigned int num;
};
struct extension_details {
struct config_item item;
struct qstr name;
unsigned int num;
};
static inline struct extensions_value *to_extensions_value(struct config_item *item)
{
return item ? container_of(to_config_group(item), struct extensions_value, group) : NULL;
}
static inline struct extension_details *to_extension_details(struct config_item *item)
{
return item ? container_of(item, struct extension_details, item) : NULL;
}
static void extension_details_release(struct config_item *item)
{
struct extension_details *extension_details = to_extension_details(item);
pr_info("sdcardfs: No longer mapping %s files to gid %d\n",
extension_details->name.name, extension_details->num);
remove_ext_gid_entry(&extension_details->name, extension_details->num);
kfree(extension_details->name.name);
kfree(extension_details);
}
static struct configfs_item_operations extension_details_item_ops = {
.release = extension_details_release,
};
static struct config_item_type extension_details_type = {
.ct_item_ops = &extension_details_item_ops,
.ct_owner = THIS_MODULE,
};
static struct config_item *extension_details_make_item(struct config_group *group, const char *name)
{
struct extensions_value *extensions_value = to_extensions_value(&group->cg_item);
struct extension_details *extension_details = kzalloc(sizeof(struct extension_details), GFP_KERNEL);
const char *tmp;
int ret;
if (!extension_details)
return ERR_PTR(-ENOMEM);
tmp = kstrdup(name, GFP_KERNEL);
if (!tmp) {
kfree(extension_details);
return ERR_PTR(-ENOMEM);
}
qstr_init(&extension_details->name, tmp);
ret = insert_ext_gid_entry(&extension_details->name, extensions_value->num);
if (ret) {
kfree(extension_details->name.name);
kfree(extension_details);
return ERR_PTR(ret);
}
config_item_init_type_name(&extension_details->item, name, &extension_details_type);
return &extension_details->item;
}
static struct configfs_group_operations extensions_value_group_ops = {
.make_item = extension_details_make_item,
};
static struct config_item_type extensions_name_type = {
.ct_group_ops = &extensions_value_group_ops,
.ct_owner = THIS_MODULE,
};
static struct config_group *extensions_make_group(struct config_group *group, const char *name)
{
struct extensions_value *extensions_value;
unsigned int tmp;
int ret;
extensions_value = kzalloc(sizeof(struct extensions_value), GFP_KERNEL);
if (!extensions_value)
return ERR_PTR(-ENOMEM);
ret = kstrtouint(name, 10, &tmp);
if (ret) {
kfree(extensions_value);
return ERR_PTR(ret);
}
extensions_value->num = tmp;
config_group_init_type_name(&extensions_value->group, name,
&extensions_name_type);
return &extensions_value->group;
}
static void extensions_drop_group(struct config_group *group, struct config_item *item)
{
struct extensions_value *value = to_extensions_value(item);
pr_info("sdcardfs: No longer mapping any files to gid %d\n", value->num);
kfree(value);
}
static struct configfs_group_operations extensions_group_ops = {
.make_group = extensions_make_group,
.drop_item = extensions_drop_group,
};
static struct config_item_type extensions_type = {
.ct_group_ops = &extensions_group_ops,
.ct_owner = THIS_MODULE,
};
struct config_group extension_group = {
.cg_item = {
.ci_namebuf = "extensions",
.ci_type = &extensions_type,
},
};
static struct config_item *packages_make_item(struct config_group *group, const char *name)
{
struct package_details *package_details;
const char *tmp;
package_details = kzalloc(sizeof(struct package_details), GFP_KERNEL);
if (!package_details)
return ERR_PTR(-ENOMEM);
tmp = kstrdup(name, GFP_KERNEL);
if (!tmp) {
kfree(package_details);
return ERR_PTR(-ENOMEM);
}
qstr_init(&package_details->name, tmp);
config_item_init_type_name(&package_details->item, name,
&package_appid_type);
return &package_details->item;
}
static ssize_t packages_list_show(struct config_item *item, char *page)
{
struct hashtable_entry *hash_cur_app;
struct hashtable_entry *hash_cur_user;
int i;
int count = 0, written = 0;
const char errormsg[] = "<truncated>\n";
unsigned int hash;
rcu_read_lock();
hash_for_each_rcu(package_to_appid, i, hash_cur_app, hlist) {
written = scnprintf(page + count, PAGE_SIZE - sizeof(errormsg) - count, "%s %d\n",
hash_cur_app->key.name, atomic_read(&hash_cur_app->value));
hash = hash_cur_app->key.hash;
hash_for_each_possible_rcu(package_to_userid, hash_cur_user, hlist, hash) {
if (qstr_case_eq(&hash_cur_app->key, &hash_cur_user->key)) {
written += scnprintf(page + count + written - 1,
PAGE_SIZE - sizeof(errormsg) - count - written + 1,
" %d\n", atomic_read(&hash_cur_user->value)) - 1;
}
}
if (count + written == PAGE_SIZE - sizeof(errormsg) - 1) {
count += scnprintf(page + count, PAGE_SIZE - count, errormsg);
break;
}
count += written;
}
rcu_read_unlock();
return count;
}
static ssize_t packages_remove_userid_store(struct config_item *item,
const char *page, size_t count)
{
unsigned int tmp;
int ret;
ret = kstrtouint(page, 10, &tmp);
if (ret)
return ret;
remove_userid_all_entry(tmp);
return count;
}
static struct configfs_attribute packages_attr_packages_gid_list = {
.ca_name = "packages_gid.list",
.ca_mode = S_IRUGO,
.ca_owner = THIS_MODULE,
.show = packages_list_show,
};
SDCARDFS_CONFIGFS_ATTR_WO(packages_, remove_userid);
static struct configfs_attribute *packages_attrs[] = {
&packages_attr_packages_gid_list,
&packages_attr_remove_userid,
NULL,
};
/*
* Note that, since no extra work is required on ->drop_item(),
* no ->drop_item() is provided.
*/
static struct configfs_group_operations packages_group_ops = {
.make_item = packages_make_item,
};
static struct config_item_type packages_type = {
.ct_group_ops = &packages_group_ops,
.ct_attrs = packages_attrs,
.ct_owner = THIS_MODULE,
};
struct config_group *sd_default_groups[] = {
&extension_group,
NULL,
};
static struct configfs_subsystem sdcardfs_packages = {
.su_group = {
.cg_item = {
.ci_namebuf = "sdcardfs",
.ci_type = &packages_type,
},
.default_groups = sd_default_groups,
},
};
static int configfs_sdcardfs_init(void)
{
int ret, i;
struct configfs_subsystem *subsys = &sdcardfs_packages;
for (i = 0; sd_default_groups[i]; i++)
config_group_init(sd_default_groups[i]);
config_group_init(&subsys->su_group);
mutex_init(&subsys->su_mutex);
ret = configfs_register_subsystem(subsys);
if (ret) {
pr_err("Error %d while registering subsystem %s\n",
ret,
subsys->su_group.cg_item.ci_namebuf);
}
return ret;
}
static void configfs_sdcardfs_exit(void)
{
configfs_unregister_subsystem(&sdcardfs_packages);
}
int packagelist_init(void)
{
hashtable_entry_cachep =
kmem_cache_create("packagelist_hashtable_entry",
sizeof(struct hashtable_entry), 0, 0, NULL);
if (!hashtable_entry_cachep) {
pr_err("sdcardfs: failed creating pkgl_hashtable entry slab cache\n");
return -ENOMEM;
}
configfs_sdcardfs_init();
return 0;
}
void packagelist_exit(void)
{
configfs_sdcardfs_exit();
packagelist_destroy();
kmem_cache_destroy(hashtable_entry_cachep);
}