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1da177e4 LT |
1 | /* |
2 | * smbiod.c | |
3 | * | |
4 | * Copyright (C) 2000, Charles Loep / Corel Corp. | |
5 | * Copyright (C) 2001, Urban Widmark | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | |
9 | #include <linux/sched.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/stat.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/file.h> | |
18 | #include <linux/dcache.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/net.h> | |
fa366ad5 | 22 | #include <linux/kthread.h> |
1da177e4 LT |
23 | #include <net/ip.h> |
24 | ||
25 | #include <linux/smb_fs.h> | |
26 | #include <linux/smbno.h> | |
27 | #include <linux/smb_mount.h> | |
28 | ||
29 | #include <asm/system.h> | |
30 | #include <asm/uaccess.h> | |
31 | ||
32 | #include "smb_debug.h" | |
33 | #include "request.h" | |
34 | #include "proto.h" | |
35 | ||
36 | enum smbiod_state { | |
37 | SMBIOD_DEAD, | |
38 | SMBIOD_STARTING, | |
39 | SMBIOD_RUNNING, | |
40 | }; | |
41 | ||
42 | static enum smbiod_state smbiod_state = SMBIOD_DEAD; | |
fa366ad5 | 43 | static struct task_struct *smbiod_thread; |
1da177e4 LT |
44 | static DECLARE_WAIT_QUEUE_HEAD(smbiod_wait); |
45 | static LIST_HEAD(smb_servers); | |
46 | static DEFINE_SPINLOCK(servers_lock); | |
47 | ||
48 | #define SMBIOD_DATA_READY (1<<0) | |
49 | static long smbiod_flags; | |
50 | ||
51 | static int smbiod(void *); | |
52 | static int smbiod_start(void); | |
53 | ||
54 | /* | |
55 | * called when there's work for us to do | |
56 | */ | |
57 | void smbiod_wake_up(void) | |
58 | { | |
59 | if (smbiod_state == SMBIOD_DEAD) | |
60 | return; | |
61 | set_bit(SMBIOD_DATA_READY, &smbiod_flags); | |
62 | wake_up_interruptible(&smbiod_wait); | |
63 | } | |
64 | ||
65 | /* | |
66 | * start smbiod if none is running | |
67 | */ | |
68 | static int smbiod_start(void) | |
69 | { | |
fa366ad5 SH |
70 | struct task_struct *tsk; |
71 | int err = 0; | |
72 | ||
1da177e4 LT |
73 | if (smbiod_state != SMBIOD_DEAD) |
74 | return 0; | |
75 | smbiod_state = SMBIOD_STARTING; | |
76 | __module_get(THIS_MODULE); | |
77 | spin_unlock(&servers_lock); | |
fa366ad5 SH |
78 | tsk = kthread_run(smbiod, NULL, "smbiod"); |
79 | if (IS_ERR(tsk)) { | |
80 | err = PTR_ERR(tsk); | |
1da177e4 | 81 | module_put(THIS_MODULE); |
fa366ad5 | 82 | } |
1da177e4 LT |
83 | |
84 | spin_lock(&servers_lock); | |
fa366ad5 SH |
85 | if (err < 0) { |
86 | smbiod_state = SMBIOD_DEAD; | |
87 | smbiod_thread = NULL; | |
88 | } else { | |
89 | smbiod_state = SMBIOD_RUNNING; | |
90 | smbiod_thread = tsk; | |
91 | } | |
92 | return err; | |
1da177e4 LT |
93 | } |
94 | ||
95 | /* | |
96 | * register a server & start smbiod if necessary | |
97 | */ | |
98 | int smbiod_register_server(struct smb_sb_info *server) | |
99 | { | |
100 | int ret; | |
101 | spin_lock(&servers_lock); | |
102 | list_add(&server->entry, &smb_servers); | |
103 | VERBOSE("%p\n", server); | |
104 | ret = smbiod_start(); | |
105 | spin_unlock(&servers_lock); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Unregister a server | |
111 | * Must be called with the server lock held. | |
112 | */ | |
113 | void smbiod_unregister_server(struct smb_sb_info *server) | |
114 | { | |
115 | spin_lock(&servers_lock); | |
116 | list_del_init(&server->entry); | |
117 | VERBOSE("%p\n", server); | |
118 | spin_unlock(&servers_lock); | |
119 | ||
120 | smbiod_wake_up(); | |
121 | smbiod_flush(server); | |
122 | } | |
123 | ||
124 | void smbiod_flush(struct smb_sb_info *server) | |
125 | { | |
126 | struct list_head *tmp, *n; | |
127 | struct smb_request *req; | |
128 | ||
129 | list_for_each_safe(tmp, n, &server->xmitq) { | |
130 | req = list_entry(tmp, struct smb_request, rq_queue); | |
131 | req->rq_errno = -EIO; | |
132 | list_del_init(&req->rq_queue); | |
133 | smb_rput(req); | |
134 | wake_up_interruptible(&req->rq_wait); | |
135 | } | |
136 | list_for_each_safe(tmp, n, &server->recvq) { | |
137 | req = list_entry(tmp, struct smb_request, rq_queue); | |
138 | req->rq_errno = -EIO; | |
139 | list_del_init(&req->rq_queue); | |
140 | smb_rput(req); | |
141 | wake_up_interruptible(&req->rq_wait); | |
142 | } | |
143 | } | |
144 | ||
145 | /* | |
146 | * Wake up smbmount and make it reconnect to the server. | |
147 | * This must be called with the server locked. | |
148 | * | |
149 | * FIXME: add smbconnect version to this | |
150 | */ | |
151 | int smbiod_retry(struct smb_sb_info *server) | |
152 | { | |
153 | struct list_head *head; | |
154 | struct smb_request *req; | |
155 | pid_t pid = server->conn_pid; | |
156 | int result = 0; | |
157 | ||
158 | VERBOSE("state: %d\n", server->state); | |
159 | if (server->state == CONN_VALID || server->state == CONN_RETRYING) | |
160 | goto out; | |
161 | ||
162 | smb_invalidate_inodes(server); | |
163 | ||
164 | /* | |
165 | * Some requests are meaningless after a retry, so we abort them. | |
166 | * One example are all requests using 'fileid' since the files are | |
167 | * closed on retry. | |
168 | */ | |
169 | head = server->xmitq.next; | |
170 | while (head != &server->xmitq) { | |
171 | req = list_entry(head, struct smb_request, rq_queue); | |
172 | head = head->next; | |
173 | ||
174 | req->rq_bytes_sent = 0; | |
175 | if (req->rq_flags & SMB_REQ_NORETRY) { | |
176 | VERBOSE("aborting request %p on xmitq\n", req); | |
177 | req->rq_errno = -EIO; | |
178 | list_del_init(&req->rq_queue); | |
179 | smb_rput(req); | |
180 | wake_up_interruptible(&req->rq_wait); | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * FIXME: test the code for retrying request we already sent | |
186 | */ | |
187 | head = server->recvq.next; | |
188 | while (head != &server->recvq) { | |
189 | req = list_entry(head, struct smb_request, rq_queue); | |
190 | head = head->next; | |
191 | #if 0 | |
192 | if (req->rq_flags & SMB_REQ_RETRY) { | |
193 | /* must move the request to the xmitq */ | |
194 | VERBOSE("retrying request %p on recvq\n", req); | |
f116629d | 195 | list_move(&req->rq_queue, &server->xmitq); |
1da177e4 LT |
196 | continue; |
197 | } | |
198 | #endif | |
199 | ||
200 | VERBOSE("aborting request %p on recvq\n", req); | |
201 | /* req->rq_rcls = ???; */ /* FIXME: set smb error code too? */ | |
202 | req->rq_errno = -EIO; | |
203 | list_del_init(&req->rq_queue); | |
204 | smb_rput(req); | |
205 | wake_up_interruptible(&req->rq_wait); | |
206 | } | |
207 | ||
208 | smb_close_socket(server); | |
209 | ||
210 | if (pid == 0) { | |
211 | /* FIXME: this is fatal, umount? */ | |
212 | printk(KERN_ERR "smb_retry: no connection process\n"); | |
213 | server->state = CONN_RETRIED; | |
214 | goto out; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Change state so that only one retry per server will be started. | |
219 | */ | |
220 | server->state = CONN_RETRYING; | |
221 | ||
222 | /* | |
223 | * Note: use the "priv" flag, as a user process may need to reconnect. | |
224 | */ | |
225 | result = kill_proc(pid, SIGUSR1, 1); | |
226 | if (result) { | |
227 | /* FIXME: this is most likely fatal, umount? */ | |
228 | printk(KERN_ERR "smb_retry: signal failed [%d]\n", result); | |
229 | goto out; | |
230 | } | |
231 | VERBOSE("signalled pid %d\n", pid); | |
232 | ||
233 | /* FIXME: The retried requests should perhaps get a "time boost". */ | |
234 | ||
235 | out: | |
236 | return result; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Currently handles lockingX packets. | |
241 | */ | |
242 | static void smbiod_handle_request(struct smb_sb_info *server) | |
243 | { | |
244 | PARANOIA("smbiod got a request ... and we don't implement oplocks!\n"); | |
245 | server->rstate = SMB_RECV_DROP; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Do some IO for one server. | |
250 | */ | |
251 | static void smbiod_doio(struct smb_sb_info *server) | |
252 | { | |
253 | int result; | |
254 | int maxwork = 7; | |
255 | ||
256 | if (server->state != CONN_VALID) | |
257 | goto out; | |
258 | ||
259 | do { | |
260 | result = smb_request_recv(server); | |
261 | if (result < 0) { | |
262 | server->state = CONN_INVALID; | |
263 | smbiod_retry(server); | |
264 | goto out; /* reconnecting is slow */ | |
265 | } else if (server->rstate == SMB_RECV_REQUEST) | |
266 | smbiod_handle_request(server); | |
267 | } while (result > 0 && maxwork-- > 0); | |
268 | ||
269 | /* | |
270 | * If there is more to read then we want to be sure to wake up again. | |
271 | */ | |
272 | if (server->state != CONN_VALID) | |
273 | goto out; | |
274 | if (smb_recv_available(server) > 0) | |
275 | set_bit(SMBIOD_DATA_READY, &smbiod_flags); | |
276 | ||
277 | do { | |
278 | result = smb_request_send_server(server); | |
279 | if (result < 0) { | |
280 | server->state = CONN_INVALID; | |
281 | smbiod_retry(server); | |
282 | goto out; /* reconnecting is slow */ | |
283 | } | |
284 | } while (result > 0); | |
285 | ||
286 | /* | |
287 | * If the last request was not sent out we want to wake up again. | |
288 | */ | |
289 | if (!list_empty(&server->xmitq)) | |
290 | set_bit(SMBIOD_DATA_READY, &smbiod_flags); | |
291 | ||
292 | out: | |
293 | return; | |
294 | } | |
295 | ||
296 | /* | |
297 | * smbiod kernel thread | |
298 | */ | |
299 | static int smbiod(void *unused) | |
300 | { | |
1da177e4 LT |
301 | allow_signal(SIGKILL); |
302 | ||
303 | VERBOSE("SMB Kernel thread starting (%d) ...\n", current->pid); | |
304 | ||
305 | for (;;) { | |
306 | struct smb_sb_info *server; | |
307 | struct list_head *pos, *n; | |
308 | ||
309 | /* FIXME: Use poll? */ | |
310 | wait_event_interruptible(smbiod_wait, | |
311 | test_bit(SMBIOD_DATA_READY, &smbiod_flags)); | |
312 | if (signal_pending(current)) { | |
313 | spin_lock(&servers_lock); | |
314 | smbiod_state = SMBIOD_DEAD; | |
315 | spin_unlock(&servers_lock); | |
316 | break; | |
317 | } | |
318 | ||
319 | clear_bit(SMBIOD_DATA_READY, &smbiod_flags); | |
320 | ||
321 | spin_lock(&servers_lock); | |
322 | if (list_empty(&smb_servers)) { | |
323 | smbiod_state = SMBIOD_DEAD; | |
324 | spin_unlock(&servers_lock); | |
325 | break; | |
326 | } | |
327 | ||
328 | list_for_each_safe(pos, n, &smb_servers) { | |
329 | server = list_entry(pos, struct smb_sb_info, entry); | |
330 | VERBOSE("checking server %p\n", server); | |
331 | ||
332 | if (server->state == CONN_VALID) { | |
333 | spin_unlock(&servers_lock); | |
334 | ||
335 | smb_lock_server(server); | |
336 | smbiod_doio(server); | |
337 | smb_unlock_server(server); | |
338 | ||
339 | spin_lock(&servers_lock); | |
340 | } | |
341 | } | |
342 | spin_unlock(&servers_lock); | |
343 | } | |
344 | ||
345 | VERBOSE("SMB Kernel thread exiting (%d) ...\n", current->pid); | |
346 | module_put_and_exit(0); | |
347 | } |