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20#include <linux/module.h>
21#include <linux/errno.h>
22#include <linux/kernel.h>
23#include <linux/major.h>
24#include <linux/time.h>
25#include <linux/sched.h>
26#include <linux/slab.h>
27#include <linux/ioport.h>
28#include <linux/fcntl.h>
29#include <linux/delay.h>
30#include <linux/skbuff.h>
31#include <linux/proc_fs.h>
32#include <linux/vmalloc.h>
33#include <linux/fs.h>
34#include <linux/file.h>
35#include <linux/poll.h>
36#include <linux/init.h>
37#include <linux/list.h>
38#include <linux/mutex.h>
39#include <linux/device.h>
40#include <linux/pid_namespace.h>
41#include <asm/io.h>
42#include <asm/poll.h>
43#include <asm/uaccess.h>
44
45#include <linux/coda.h>
46#include <linux/coda_psdev.h>
47
48#include "coda_linux.h"
49
50#include "coda_int.h"
51
52
53int coda_hard;
54unsigned long coda_timeout = 30;
55
56
57struct venus_comm coda_comms[MAX_CODADEVS];
58static struct class *coda_psdev_class;
59
60
61
62
63
64static unsigned int coda_psdev_poll(struct file *file, poll_table * wait)
65{
66 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
67 unsigned int mask = POLLOUT | POLLWRNORM;
68
69 poll_wait(file, &vcp->vc_waitq, wait);
70 mutex_lock(&vcp->vc_mutex);
71 if (!list_empty(&vcp->vc_pending))
72 mask |= POLLIN | POLLRDNORM;
73 mutex_unlock(&vcp->vc_mutex);
74
75 return mask;
76}
77
78static long coda_psdev_ioctl(struct file * filp, unsigned int cmd, unsigned long arg)
79{
80 unsigned int data;
81
82 switch(cmd) {
83 case CIOC_KERNEL_VERSION:
84 data = CODA_KERNEL_VERSION;
85 return put_user(data, (int __user *) arg);
86 default:
87 return -ENOTTY;
88 }
89
90 return 0;
91}
92
93
94
95
96
97static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
98 size_t nbytes, loff_t *off)
99{
100 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
101 struct upc_req *req = NULL;
102 struct upc_req *tmp;
103 struct list_head *lh;
104 struct coda_in_hdr hdr;
105 ssize_t retval = 0, count = 0;
106 int error;
107
108
109 if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
110 return -EFAULT;
111
112 if (DOWNCALL(hdr.opcode)) {
113 union outputArgs *dcbuf;
114 int size = sizeof(*dcbuf);
115
116 if ( nbytes < sizeof(struct coda_out_hdr) ) {
117 printk("coda_downcall opc %d uniq %d, not enough!\n",
118 hdr.opcode, hdr.unique);
119 count = nbytes;
120 goto out;
121 }
122 if ( nbytes > size ) {
123 printk("Coda: downcall opc %d, uniq %d, too much!",
124 hdr.opcode, hdr.unique);
125 nbytes = size;
126 }
127 CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
128 if (copy_from_user(dcbuf, buf, nbytes)) {
129 CODA_FREE(dcbuf, nbytes);
130 retval = -EFAULT;
131 goto out;
132 }
133
134
135 error = coda_downcall(vcp, hdr.opcode, dcbuf);
136
137 CODA_FREE(dcbuf, nbytes);
138 if (error) {
139 printk("psdev_write: coda_downcall error: %d\n", error);
140 retval = error;
141 goto out;
142 }
143 count = nbytes;
144 goto out;
145 }
146
147
148 mutex_lock(&vcp->vc_mutex);
149 list_for_each(lh, &vcp->vc_processing) {
150 tmp = list_entry(lh, struct upc_req , uc_chain);
151 if (tmp->uc_unique == hdr.unique) {
152 req = tmp;
153 list_del(&req->uc_chain);
154 break;
155 }
156 }
157 mutex_unlock(&vcp->vc_mutex);
158
159 if (!req) {
160 printk("psdev_write: msg (%d, %d) not found\n",
161 hdr.opcode, hdr.unique);
162 retval = -ESRCH;
163 goto out;
164 }
165
166
167 if (req->uc_outSize < nbytes) {
168 printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
169 req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
170 nbytes = req->uc_outSize;
171 }
172 if (copy_from_user(req->uc_data, buf, nbytes)) {
173 req->uc_flags |= CODA_REQ_ABORT;
174 wake_up(&req->uc_sleep);
175 retval = -EFAULT;
176 goto out;
177 }
178
179
180 req->uc_outSize = nbytes;
181 req->uc_flags |= CODA_REQ_WRITE;
182 count = nbytes;
183
184
185 if (req->uc_opcode == CODA_OPEN_BY_FD) {
186 struct coda_open_by_fd_out *outp =
187 (struct coda_open_by_fd_out *)req->uc_data;
188 if (!outp->oh.result)
189 outp->fh = fget(outp->fd);
190 }
191
192 wake_up(&req->uc_sleep);
193out:
194 return(count ? count : retval);
195}
196
197
198
199
200
201static ssize_t coda_psdev_read(struct file * file, char __user * buf,
202 size_t nbytes, loff_t *off)
203{
204 DECLARE_WAITQUEUE(wait, current);
205 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
206 struct upc_req *req;
207 ssize_t retval = 0, count = 0;
208
209 if (nbytes == 0)
210 return 0;
211
212 mutex_lock(&vcp->vc_mutex);
213
214 add_wait_queue(&vcp->vc_waitq, &wait);
215 set_current_state(TASK_INTERRUPTIBLE);
216
217 while (list_empty(&vcp->vc_pending)) {
218 if (file->f_flags & O_NONBLOCK) {
219 retval = -EAGAIN;
220 break;
221 }
222 if (signal_pending(current)) {
223 retval = -ERESTARTSYS;
224 break;
225 }
226 mutex_unlock(&vcp->vc_mutex);
227 schedule();
228 mutex_lock(&vcp->vc_mutex);
229 }
230
231 set_current_state(TASK_RUNNING);
232 remove_wait_queue(&vcp->vc_waitq, &wait);
233
234 if (retval)
235 goto out;
236
237 req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
238 list_del(&req->uc_chain);
239
240
241 count = req->uc_inSize;
242 if (nbytes < req->uc_inSize) {
243 printk ("psdev_read: Venus read %ld bytes of %d in message\n",
244 (long)nbytes, req->uc_inSize);
245 count = nbytes;
246 }
247
248 if (copy_to_user(buf, req->uc_data, count))
249 retval = -EFAULT;
250
251
252 if (!(req->uc_flags & CODA_REQ_ASYNC)) {
253 req->uc_flags |= CODA_REQ_READ;
254 list_add_tail(&(req->uc_chain), &vcp->vc_processing);
255 goto out;
256 }
257
258 CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
259 kfree(req);
260out:
261 mutex_unlock(&vcp->vc_mutex);
262 return (count ? count : retval);
263}
264
265static int coda_psdev_open(struct inode * inode, struct file * file)
266{
267 struct venus_comm *vcp;
268 int idx, err;
269
270 if (task_active_pid_ns(current) != &init_pid_ns)
271 return -EINVAL;
272
273 if (current_user_ns() != &init_user_ns)
274 return -EINVAL;
275
276 idx = iminor(inode);
277 if (idx < 0 || idx >= MAX_CODADEVS)
278 return -ENODEV;
279
280 err = -EBUSY;
281 vcp = &coda_comms[idx];
282 mutex_lock(&vcp->vc_mutex);
283
284 if (!vcp->vc_inuse) {
285 vcp->vc_inuse++;
286
287 INIT_LIST_HEAD(&vcp->vc_pending);
288 INIT_LIST_HEAD(&vcp->vc_processing);
289 init_waitqueue_head(&vcp->vc_waitq);
290 vcp->vc_sb = NULL;
291 vcp->vc_seq = 0;
292
293 file->private_data = vcp;
294 err = 0;
295 }
296
297 mutex_unlock(&vcp->vc_mutex);
298 return err;
299}
300
301
302static int coda_psdev_release(struct inode * inode, struct file * file)
303{
304 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
305 struct upc_req *req, *tmp;
306
307 if (!vcp || !vcp->vc_inuse ) {
308 printk("psdev_release: Not open.\n");
309 return -1;
310 }
311
312 mutex_lock(&vcp->vc_mutex);
313
314
315 list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
316 list_del(&req->uc_chain);
317
318
319 if (req->uc_flags & CODA_REQ_ASYNC) {
320 CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
321 kfree(req);
322 continue;
323 }
324 req->uc_flags |= CODA_REQ_ABORT;
325 wake_up(&req->uc_sleep);
326 }
327
328 list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
329 list_del(&req->uc_chain);
330
331 req->uc_flags |= CODA_REQ_ABORT;
332 wake_up(&req->uc_sleep);
333 }
334
335 file->private_data = NULL;
336 vcp->vc_inuse--;
337 mutex_unlock(&vcp->vc_mutex);
338 return 0;
339}
340
341
342static const struct file_operations coda_psdev_fops = {
343 .owner = THIS_MODULE,
344 .read = coda_psdev_read,
345 .write = coda_psdev_write,
346 .poll = coda_psdev_poll,
347 .unlocked_ioctl = coda_psdev_ioctl,
348 .open = coda_psdev_open,
349 .release = coda_psdev_release,
350 .llseek = noop_llseek,
351};
352
353static int init_coda_psdev(void)
354{
355 int i, err = 0;
356 if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
357 printk(KERN_ERR "coda_psdev: unable to get major %d\n",
358 CODA_PSDEV_MAJOR);
359 return -EIO;
360 }
361 coda_psdev_class = class_create(THIS_MODULE, "coda");
362 if (IS_ERR(coda_psdev_class)) {
363 err = PTR_ERR(coda_psdev_class);
364 goto out_chrdev;
365 }
366 for (i = 0; i < MAX_CODADEVS; i++) {
367 mutex_init(&(&coda_comms[i])->vc_mutex);
368 device_create(coda_psdev_class, NULL,
369 MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
370 }
371 coda_sysctl_init();
372 goto out;
373
374out_chrdev:
375 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
376out:
377 return err;
378}
379
380MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
381MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
382MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
383MODULE_LICENSE("GPL");
384MODULE_VERSION("6.6");
385
386static int __init init_coda(void)
387{
388 int status;
389 int i;
390
391 status = coda_init_inodecache();
392 if (status)
393 goto out2;
394 status = init_coda_psdev();
395 if ( status ) {
396 printk("Problem (%d) in init_coda_psdev\n", status);
397 goto out1;
398 }
399
400 status = register_filesystem(&coda_fs_type);
401 if (status) {
402 printk("coda: failed to register filesystem!\n");
403 goto out;
404 }
405 return 0;
406out:
407 for (i = 0; i < MAX_CODADEVS; i++)
408 device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
409 class_destroy(coda_psdev_class);
410 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
411 coda_sysctl_clean();
412out1:
413 coda_destroy_inodecache();
414out2:
415 return status;
416}
417
418static void __exit exit_coda(void)
419{
420 int err, i;
421
422 err = unregister_filesystem(&coda_fs_type);
423 if ( err != 0 ) {
424 printk("coda: failed to unregister filesystem\n");
425 }
426 for (i = 0; i < MAX_CODADEVS; i++)
427 device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
428 class_destroy(coda_psdev_class);
429 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
430 coda_sysctl_clean();
431 coda_destroy_inodecache();
432}
433
434module_init(init_coda);
435module_exit(exit_coda);
436
437
