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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/xarray.h>
#include "../transport_ipc.h"
#include "../connection.h"
#include "tree_connect.h"
#include "user_config.h"
#include "share_config.h"
#include "user_session.h"
struct ksmbd_tree_conn_status
ksmbd_tree_conn_connect(struct ksmbd_work *work, const char *share_name)
{
struct ksmbd_tree_conn_status status = {-ENOENT, NULL};
struct ksmbd_tree_connect_response *resp = NULL;
struct ksmbd_share_config *sc;
struct ksmbd_tree_connect *tree_conn = NULL;
struct sockaddr *peer_addr;
struct ksmbd_conn *conn = work->conn;
struct ksmbd_session *sess = work->sess;
int ret;
sc = ksmbd_share_config_get(work, share_name);
if (!sc)
return status;
tree_conn = kzalloc(sizeof(struct ksmbd_tree_connect), GFP_KERNEL);
if (!tree_conn) {
status.ret = -ENOMEM;
goto out_error;
}
tree_conn->id = ksmbd_acquire_tree_conn_id(sess);
if (tree_conn->id < 0) {
status.ret = -EINVAL;
goto out_error;
}
peer_addr = KSMBD_TCP_PEER_SOCKADDR(conn);
resp = ksmbd_ipc_tree_connect_request(sess,
sc,
tree_conn,
peer_addr);
if (!resp) {
status.ret = -EINVAL;
goto out_error;
}
status.ret = resp->status;
if (status.ret != KSMBD_TREE_CONN_STATUS_OK)
goto out_error;
tree_conn->flags = resp->connection_flags;
if (test_tree_conn_flag(tree_conn, KSMBD_TREE_CONN_FLAG_UPDATE)) {
struct ksmbd_share_config *new_sc;
ksmbd_share_config_del(sc);
new_sc = ksmbd_share_config_get(work, share_name);
if (!new_sc) {
pr_err("Failed to update stale share config\n");
status.ret = -ESTALE;
goto out_error;
}
ksmbd_share_config_put(sc);
sc = new_sc;
}
tree_conn->user = sess->user;
tree_conn->share_conf = sc;
tree_conn->t_state = TREE_NEW;
status.tree_conn = tree_conn;
atomic_set(&tree_conn->refcount, 1);
init_waitqueue_head(&tree_conn->refcount_q);
ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn,
GFP_KERNEL));
if (ret) {
status.ret = -ENOMEM;
goto out_error;
}
kvfree(resp);
return status;
out_error:
if (tree_conn)
ksmbd_release_tree_conn_id(sess, tree_conn->id);
ksmbd_share_config_put(sc);
kfree(tree_conn);
kvfree(resp);
return status;
}
void ksmbd_tree_connect_put(struct ksmbd_tree_connect *tcon)
{
/*
* Checking waitqueue to releasing tree connect on
* tree disconnect. waitqueue_active is safe because it
* uses atomic operation for condition.
*/
if (!atomic_dec_return(&tcon->refcount) &&
waitqueue_active(&tcon->refcount_q))
wake_up(&tcon->refcount_q);
}
int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess,
struct ksmbd_tree_connect *tree_conn)
{
int ret;
write_lock(&sess->tree_conns_lock);
xa_erase(&sess->tree_conns, tree_conn->id);
write_unlock(&sess->tree_conns_lock);
if (!atomic_dec_and_test(&tree_conn->refcount))
wait_event(tree_conn->refcount_q,
atomic_read(&tree_conn->refcount) == 0);
ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id);
ksmbd_release_tree_conn_id(sess, tree_conn->id);
ksmbd_share_config_put(tree_conn->share_conf);
kfree(tree_conn);
return ret;
}
struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess,
unsigned int id)
{
struct ksmbd_tree_connect *tcon;
read_lock(&sess->tree_conns_lock);
tcon = xa_load(&sess->tree_conns, id);
if (tcon) {
if (tcon->t_state != TREE_CONNECTED)
tcon = NULL;
else if (!atomic_inc_not_zero(&tcon->refcount))
tcon = NULL;
}
read_unlock(&sess->tree_conns_lock);
return tcon;
}
int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess)
{
int ret = 0;
struct ksmbd_tree_connect *tc;
unsigned long id;
if (!sess)
return -EINVAL;
xa_for_each(&sess->tree_conns, id, tc) {
write_lock(&sess->tree_conns_lock);
if (tc->t_state == TREE_DISCONNECTED) {
write_unlock(&sess->tree_conns_lock);
ret = -ENOENT;
continue;
}
tc->t_state = TREE_DISCONNECTED;
write_unlock(&sess->tree_conns_lock);
ret |= ksmbd_tree_conn_disconnect(sess, tc);
}
xa_destroy(&sess->tree_conns);
return ret;
}
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