[PATCH] delete from_swap_cache BUG_ONs
[linux-ginger.git] / fs / smbfs / sock.c
blob6815b1b12b68853351a9af047031de63cfae7782
1 /*
2 * sock.c
4 * Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
5 * Copyright (C) 1997 by Volker Lendecke
7 * Please add a note about your changes to smbfs in the ChangeLog file.
8 */
10 #include <linux/fs.h>
11 #include <linux/time.h>
12 #include <linux/errno.h>
13 #include <linux/socket.h>
14 #include <linux/fcntl.h>
15 #include <linux/file.h>
16 #include <linux/in.h>
17 #include <linux/net.h>
18 #include <linux/mm.h>
19 #include <linux/netdevice.h>
20 #include <linux/smp_lock.h>
21 #include <linux/workqueue.h>
22 #include <net/scm.h>
23 #include <net/tcp_states.h>
24 #include <net/ip.h>
26 #include <linux/smb_fs.h>
27 #include <linux/smb.h>
28 #include <linux/smbno.h>
30 #include <asm/uaccess.h>
31 #include <asm/ioctls.h>
33 #include "smb_debug.h"
34 #include "proto.h"
35 #include "request.h"
38 static int
39 _recvfrom(struct socket *socket, unsigned char *ubuf, int size, unsigned flags)
41 struct kvec iov = {ubuf, size};
42 struct msghdr msg = {.msg_flags = flags};
43 msg.msg_flags |= MSG_DONTWAIT | MSG_NOSIGNAL;
44 return kernel_recvmsg(socket, &msg, &iov, 1, size, msg.msg_flags);
48 * Return the server this socket belongs to
50 static struct smb_sb_info *
51 server_from_socket(struct socket *socket)
53 return socket->sk->sk_user_data;
57 * Called when there is data on the socket.
59 void
60 smb_data_ready(struct sock *sk, int len)
62 struct smb_sb_info *server = server_from_socket(sk->sk_socket);
63 void (*data_ready)(struct sock *, int) = server->data_ready;
65 data_ready(sk, len);
66 VERBOSE("(%p, %d)\n", sk, len);
67 smbiod_wake_up();
70 int
71 smb_valid_socket(struct inode * inode)
73 return (inode && S_ISSOCK(inode->i_mode) &&
74 SOCKET_I(inode)->type == SOCK_STREAM);
77 static struct socket *
78 server_sock(struct smb_sb_info *server)
80 struct file *file;
82 if (server && (file = server->sock_file))
84 #ifdef SMBFS_PARANOIA
85 if (!smb_valid_socket(file->f_dentry->d_inode))
86 PARANOIA("bad socket!\n");
87 #endif
88 return SOCKET_I(file->f_dentry->d_inode);
90 return NULL;
93 void
94 smb_close_socket(struct smb_sb_info *server)
96 struct file * file = server->sock_file;
98 if (file) {
99 struct socket *sock = server_sock(server);
101 VERBOSE("closing socket %p\n", sock);
102 sock->sk->sk_data_ready = server->data_ready;
103 server->sock_file = NULL;
104 fput(file);
108 static int
109 smb_get_length(struct socket *socket, unsigned char *header)
111 int result;
113 result = _recvfrom(socket, header, 4, MSG_PEEK);
114 if (result == -EAGAIN)
115 return -ENODATA;
116 if (result < 0) {
117 PARANOIA("recv error = %d\n", -result);
118 return result;
120 if (result < 4)
121 return -ENODATA;
123 switch (header[0]) {
124 case 0x00:
125 case 0x82:
126 break;
128 case 0x85:
129 DEBUG1("Got SESSION KEEP ALIVE\n");
130 _recvfrom(socket, header, 4, 0); /* read away */
131 return -ENODATA;
133 default:
134 PARANOIA("Invalid NBT packet, code=%x\n", header[0]);
135 return -EIO;
138 /* The length in the RFC NB header is the raw data length */
139 return smb_len(header);
143 smb_recv_available(struct smb_sb_info *server)
145 mm_segment_t oldfs;
146 int avail, err;
147 struct socket *sock = server_sock(server);
149 oldfs = get_fs();
150 set_fs(get_ds());
151 err = sock->ops->ioctl(sock, SIOCINQ, (unsigned long) &avail);
152 set_fs(oldfs);
153 return (err >= 0) ? avail : err;
157 * Adjust the kvec to move on 'n' bytes (from nfs/sunrpc)
159 static int
160 smb_move_iov(struct kvec **data, size_t *num, struct kvec *vec, unsigned amount)
162 struct kvec *iv = *data;
163 int i;
164 int len;
167 * Eat any sent kvecs
169 while (iv->iov_len <= amount) {
170 amount -= iv->iov_len;
171 iv++;
172 (*num)--;
176 * And chew down the partial one
178 vec[0].iov_len = iv->iov_len-amount;
179 vec[0].iov_base =((unsigned char *)iv->iov_base)+amount;
180 iv++;
182 len = vec[0].iov_len;
185 * And copy any others
187 for (i = 1; i < *num; i++) {
188 vec[i] = *iv++;
189 len += vec[i].iov_len;
192 *data = vec;
193 return len;
197 * smb_receive_header
198 * Only called by the smbiod thread.
201 smb_receive_header(struct smb_sb_info *server)
203 struct socket *sock;
204 int result = 0;
205 unsigned char peek_buf[4];
207 result = -EIO;
208 sock = server_sock(server);
209 if (!sock)
210 goto out;
211 if (sock->sk->sk_state != TCP_ESTABLISHED)
212 goto out;
214 if (!server->smb_read) {
215 result = smb_get_length(sock, peek_buf);
216 if (result < 0) {
217 if (result == -ENODATA)
218 result = 0;
219 goto out;
221 server->smb_len = result + 4;
223 if (server->smb_len < SMB_HEADER_LEN) {
224 PARANOIA("short packet: %d\n", result);
225 server->rstate = SMB_RECV_DROP;
226 result = -EIO;
227 goto out;
229 if (server->smb_len > SMB_MAX_PACKET_SIZE) {
230 PARANOIA("long packet: %d\n", result);
231 server->rstate = SMB_RECV_DROP;
232 result = -EIO;
233 goto out;
237 result = _recvfrom(sock, server->header + server->smb_read,
238 SMB_HEADER_LEN - server->smb_read, 0);
239 VERBOSE("_recvfrom: %d\n", result);
240 if (result < 0) {
241 VERBOSE("receive error: %d\n", result);
242 goto out;
244 server->smb_read += result;
246 if (server->smb_read == SMB_HEADER_LEN)
247 server->rstate = SMB_RECV_HCOMPLETE;
248 out:
249 return result;
252 static char drop_buffer[PAGE_SIZE];
255 * smb_receive_drop - read and throw away the data
256 * Only called by the smbiod thread.
258 * FIXME: we are in the kernel, could we just tell the socket that we want
259 * to drop stuff from the buffer?
262 smb_receive_drop(struct smb_sb_info *server)
264 struct socket *sock;
265 unsigned int flags;
266 struct kvec iov;
267 struct msghdr msg;
268 int rlen = smb_len(server->header) - server->smb_read + 4;
269 int result = -EIO;
271 if (rlen > PAGE_SIZE)
272 rlen = PAGE_SIZE;
274 sock = server_sock(server);
275 if (!sock)
276 goto out;
277 if (sock->sk->sk_state != TCP_ESTABLISHED)
278 goto out;
280 flags = MSG_DONTWAIT | MSG_NOSIGNAL;
281 iov.iov_base = drop_buffer;
282 iov.iov_len = PAGE_SIZE;
283 msg.msg_flags = flags;
284 msg.msg_name = NULL;
285 msg.msg_namelen = 0;
286 msg.msg_control = NULL;
288 result = kernel_recvmsg(sock, &msg, &iov, 1, rlen, flags);
290 VERBOSE("read: %d\n", result);
291 if (result < 0) {
292 VERBOSE("receive error: %d\n", result);
293 goto out;
295 server->smb_read += result;
297 if (server->smb_read >= server->smb_len)
298 server->rstate = SMB_RECV_END;
300 out:
301 return result;
305 * smb_receive
306 * Only called by the smbiod thread.
309 smb_receive(struct smb_sb_info *server, struct smb_request *req)
311 struct socket *sock;
312 unsigned int flags;
313 struct kvec iov[4];
314 struct kvec *p = req->rq_iov;
315 size_t num = req->rq_iovlen;
316 struct msghdr msg;
317 int rlen;
318 int result = -EIO;
320 sock = server_sock(server);
321 if (!sock)
322 goto out;
323 if (sock->sk->sk_state != TCP_ESTABLISHED)
324 goto out;
326 flags = MSG_DONTWAIT | MSG_NOSIGNAL;
327 msg.msg_flags = flags;
328 msg.msg_name = NULL;
329 msg.msg_namelen = 0;
330 msg.msg_control = NULL;
332 /* Dont repeat bytes and count available bufferspace */
333 rlen = smb_move_iov(&p, &num, iov, req->rq_bytes_recvd);
334 if (req->rq_rlen < rlen)
335 rlen = req->rq_rlen;
337 result = kernel_recvmsg(sock, &msg, p, num, rlen, flags);
339 VERBOSE("read: %d\n", result);
340 if (result < 0) {
341 VERBOSE("receive error: %d\n", result);
342 goto out;
344 req->rq_bytes_recvd += result;
345 server->smb_read += result;
347 out:
348 return result;
352 * Try to send a SMB request. This may return after sending only parts of the
353 * request. SMB_REQ_TRANSMITTED will be set if a request was fully sent.
355 * Parts of this was taken from xprt_sendmsg from net/sunrpc/xprt.c
358 smb_send_request(struct smb_request *req)
360 struct smb_sb_info *server = req->rq_server;
361 struct socket *sock;
362 struct msghdr msg = {.msg_flags = MSG_NOSIGNAL | MSG_DONTWAIT};
363 int slen = req->rq_slen - req->rq_bytes_sent;
364 int result = -EIO;
365 struct kvec iov[4];
366 struct kvec *p = req->rq_iov;
367 size_t num = req->rq_iovlen;
369 sock = server_sock(server);
370 if (!sock)
371 goto out;
372 if (sock->sk->sk_state != TCP_ESTABLISHED)
373 goto out;
375 /* Dont repeat bytes */
376 if (req->rq_bytes_sent)
377 smb_move_iov(&p, &num, iov, req->rq_bytes_sent);
379 result = kernel_sendmsg(sock, &msg, p, num, slen);
381 if (result >= 0) {
382 req->rq_bytes_sent += result;
383 if (req->rq_bytes_sent >= req->rq_slen)
384 req->rq_flags |= SMB_REQ_TRANSMITTED;
386 out:
387 return result;