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-rw-r--r--fs/sdcardfs/packagelist.c885
1 files changed, 885 insertions, 0 deletions
diff --git a/fs/sdcardfs/packagelist.c b/fs/sdcardfs/packagelist.c
new file mode 100644
index 000000000000..d552dde9c130
--- /dev/null
+++ b/fs/sdcardfs/packagelist.c
@@ -0,0 +1,885 @@
+/*
+ * 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");
+}
+
+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;
+}
+
+CONFIGFS_ATTR_STRUCT(package_details);
+#define PACKAGE_DETAILS_ATTR(_name, _mode, _show, _store) \
+struct package_details_attribute package_details_attr_##_name = __CONFIGFS_ATTR(_name, _mode, _show, _store)
+#define PACKAGE_DETAILS_ATTRIBUTE(name) (&package_details_attr_##name.attr)
+
+static ssize_t package_details_appid_show(struct package_details *package_details,
+ char *page)
+{
+ return scnprintf(page, PAGE_SIZE, "%u\n", __get_appid(&package_details->name));
+}
+
+static ssize_t package_details_appid_store(struct package_details *package_details,
+ const char *page, size_t count)
+{
+ unsigned int tmp;
+ int ret;
+
+ ret = kstrtouint(page, 10, &tmp);
+ if (ret)
+ return ret;
+
+ ret = insert_packagelist_entry(&package_details->name, tmp);
+
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t package_details_excluded_userids_show(struct package_details *package_details,
+ char *page)
+{
+ 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 package_details *package_details,
+ 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(&package_details->name, tmp);
+
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t package_details_clear_userid_store(struct package_details *package_details,
+ const char *page, size_t count)
+{
+ unsigned int tmp;
+ int ret;
+
+ ret = kstrtouint(page, 10, &tmp);
+ if (ret)
+ return ret;
+ remove_userid_exclude_entry(&package_details->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);
+}
+
+PACKAGE_DETAILS_ATTR(appid, S_IRUGO | S_IWUGO, package_details_appid_show, package_details_appid_store);
+PACKAGE_DETAILS_ATTR(excluded_userids, S_IRUGO | S_IWUGO,
+ package_details_excluded_userids_show, package_details_excluded_userids_store);
+PACKAGE_DETAILS_ATTR(clear_userid, S_IWUGO, NULL, package_details_clear_userid_store);
+
+static struct configfs_attribute *package_details_attrs[] = {
+ PACKAGE_DETAILS_ATTRIBUTE(appid),
+ PACKAGE_DETAILS_ATTRIBUTE(excluded_userids),
+ PACKAGE_DETAILS_ATTRIBUTE(clear_userid),
+ NULL,
+};
+
+CONFIGFS_ATTR_OPS(package_details);
+
+static struct configfs_item_operations package_details_item_ops = {
+ .release = package_details_release,
+ .show_attribute = package_details_attr_show,
+ .store_attribute = package_details_attr_store,
+};
+
+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,
+ },
+};
+
+struct packages {
+ struct configfs_subsystem subsystem;
+};
+
+static inline struct packages *to_packages(struct config_item *item)
+{
+ return item ? container_of(to_configfs_subsystem(to_config_group(item)), struct packages, subsystem) : NULL;
+}
+
+CONFIGFS_ATTR_STRUCT(packages);
+#define PACKAGES_ATTR(_name, _mode, _show, _store) \
+struct packages_attribute packages_attr_##_name = __CONFIGFS_ATTR(_name, _mode, _show, _store)
+#define PACKAGES_ATTR_RO(_name, _show) \
+struct packages_attribute packages_attr_##_name = __CONFIGFS_ATTR_RO(_name, _show)
+
+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 packages *packages,
+ 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 packages *packages,
+ 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;
+}
+
+struct packages_attribute packages_attr_packages_gid_list = __CONFIGFS_ATTR_RO(packages_gid.list, packages_list_show);
+PACKAGES_ATTR(remove_userid, S_IWUGO, NULL, packages_remove_userid_store);
+
+static struct configfs_attribute *packages_attrs[] = {
+ &packages_attr_packages_gid_list.attr,
+ &packages_attr_remove_userid.attr,
+ NULL,
+};
+
+CONFIGFS_ATTR_OPS(packages)
+static struct configfs_item_operations packages_item_ops = {
+ .show_attribute = packages_attr_show,
+ .store_attribute = packages_attr_store,
+};
+
+/*
+ * 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_item_ops = &packages_item_ops,
+ .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 packages sdcardfs_packages = {
+ .subsystem = {
+ .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.subsystem;
+
+ 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.subsystem);
+}
+
+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);
+}