1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// 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_conn *conn, struct ksmbd_session *sess,
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;
int ret;
sc = ksmbd_share_config_get(conn->um, 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(conn->um, 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;
}
|
