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1/*
2 * An implementation of a loadable kernel mode driver providing
3 * multiple kernel/user space bidirectional communications links.
4 *
5 * Author: Alan Cox <alan@lxorguk.ukuu.org.uk>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * Adapted to become the Linux 2.0 Coda pseudo device
13 * Peter Braam <braam@maths.ox.ac.uk>
14 * Michael Callahan <mjc@emmy.smith.edu>
15 *
16 * Changes for Linux 2.1
17 * Copyright (c) 1997 Carnegie-Mellon University
18 */
19
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 <linux/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/* statistics */
53int coda_hard; /* allows signals during upcalls */
54unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
55
56
57struct venus_comm coda_comms[MAX_CODADEVS];
58static struct class *coda_psdev_class;
59
60/*
61 * Device operations
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 * Receive a message written by Venus to the psdev
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 /* Peek at the opcode, uniquefier */
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 pr_warn("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 pr_warn("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 /* what downcall errors does Venus handle ? */
135 error = coda_downcall(vcp, hdr.opcode, dcbuf);
136
137 CODA_FREE(dcbuf, nbytes);
138 if (error) {
139 pr_warn("%s: coda_downcall error: %d\n",
140 __func__, error);
141 retval = error;
142 goto out;
143 }
144 count = nbytes;
145 goto out;
146 }
147
148 /* Look for the message on the processing queue. */
149 mutex_lock(&vcp->vc_mutex);
150 list_for_each(lh, &vcp->vc_processing) {
151 tmp = list_entry(lh, struct upc_req , uc_chain);
152 if (tmp->uc_unique == hdr.unique) {
153 req = tmp;
154 list_del(&req->uc_chain);
155 break;
156 }
157 }
158 mutex_unlock(&vcp->vc_mutex);
159
160 if (!req) {
161 pr_warn("%s: msg (%d, %d) not found\n",
162 __func__, hdr.opcode, hdr.unique);
163 retval = -ESRCH;
164 goto out;
165 }
166
167 /* move data into response buffer. */
168 if (req->uc_outSize < nbytes) {
169 pr_warn("%s: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
170 __func__, req->uc_outSize, (long)nbytes,
171 hdr.opcode, hdr.unique);
172 nbytes = req->uc_outSize; /* don't have more space! */
173 }
174 if (copy_from_user(req->uc_data, buf, nbytes)) {
175 req->uc_flags |= CODA_REQ_ABORT;
176 wake_up(&req->uc_sleep);
177 retval = -EFAULT;
178 goto out;
179 }
180
181 /* adjust outsize. is this useful ?? */
182 req->uc_outSize = nbytes;
183 req->uc_flags |= CODA_REQ_WRITE;
184 count = nbytes;
185
186 /* Convert filedescriptor into a file handle */
187 if (req->uc_opcode == CODA_OPEN_BY_FD) {
188 struct coda_open_by_fd_out *outp =
189 (struct coda_open_by_fd_out *)req->uc_data;
190 if (!outp->oh.result)
191 outp->fh = fget(outp->fd);
192 }
193
194 wake_up(&req->uc_sleep);
195out:
196 return(count ? count : retval);
197}
198
199/*
200 * Read a message from the kernel to Venus
201 */
202
203static ssize_t coda_psdev_read(struct file * file, char __user * buf,
204 size_t nbytes, loff_t *off)
205{
206 DECLARE_WAITQUEUE(wait, current);
207 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
208 struct upc_req *req;
209 ssize_t retval = 0, count = 0;
210
211 if (nbytes == 0)
212 return 0;
213
214 mutex_lock(&vcp->vc_mutex);
215
216 add_wait_queue(&vcp->vc_waitq, &wait);
217 set_current_state(TASK_INTERRUPTIBLE);
218
219 while (list_empty(&vcp->vc_pending)) {
220 if (file->f_flags & O_NONBLOCK) {
221 retval = -EAGAIN;
222 break;
223 }
224 if (signal_pending(current)) {
225 retval = -ERESTARTSYS;
226 break;
227 }
228 mutex_unlock(&vcp->vc_mutex);
229 schedule();
230 mutex_lock(&vcp->vc_mutex);
231 }
232
233 set_current_state(TASK_RUNNING);
234 remove_wait_queue(&vcp->vc_waitq, &wait);
235
236 if (retval)
237 goto out;
238
239 req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
240 list_del(&req->uc_chain);
241
242 /* Move the input args into userspace */
243 count = req->uc_inSize;
244 if (nbytes < req->uc_inSize) {
245 pr_warn("%s: Venus read %ld bytes of %d in message\n",
246 __func__, (long)nbytes, req->uc_inSize);
247 count = nbytes;
248 }
249
250 if (copy_to_user(buf, req->uc_data, count))
251 retval = -EFAULT;
252
253 /* If request was not a signal, enqueue and don't free */
254 if (!(req->uc_flags & CODA_REQ_ASYNC)) {
255 req->uc_flags |= CODA_REQ_READ;
256 list_add_tail(&(req->uc_chain), &vcp->vc_processing);
257 goto out;
258 }
259
260 CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
261 kfree(req);
262out:
263 mutex_unlock(&vcp->vc_mutex);
264 return (count ? count : retval);
265}
266
267static int coda_psdev_open(struct inode * inode, struct file * file)
268{
269 struct venus_comm *vcp;
270 int idx, err;
271
272 if (task_active_pid_ns(current) != &init_pid_ns)
273 return -EINVAL;
274
275 if (current_user_ns() != &init_user_ns)
276 return -EINVAL;
277
278 idx = iminor(inode);
279 if (idx < 0 || idx >= MAX_CODADEVS)
280 return -ENODEV;
281
282 err = -EBUSY;
283 vcp = &coda_comms[idx];
284 mutex_lock(&vcp->vc_mutex);
285
286 if (!vcp->vc_inuse) {
287 vcp->vc_inuse++;
288
289 INIT_LIST_HEAD(&vcp->vc_pending);
290 INIT_LIST_HEAD(&vcp->vc_processing);
291 init_waitqueue_head(&vcp->vc_waitq);
292 vcp->vc_sb = NULL;
293 vcp->vc_seq = 0;
294
295 file->private_data = vcp;
296 err = 0;
297 }
298
299 mutex_unlock(&vcp->vc_mutex);
300 return err;
301}
302
303
304static int coda_psdev_release(struct inode * inode, struct file * file)
305{
306 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
307 struct upc_req *req, *tmp;
308
309 if (!vcp || !vcp->vc_inuse ) {
310 pr_warn("%s: Not open.\n", __func__);
311 return -1;
312 }
313
314 mutex_lock(&vcp->vc_mutex);
315
316 /* Wakeup clients so they can return. */
317 list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
318 list_del(&req->uc_chain);
319
320 /* Async requests need to be freed here */
321 if (req->uc_flags & CODA_REQ_ASYNC) {
322 CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
323 kfree(req);
324 continue;
325 }
326 req->uc_flags |= CODA_REQ_ABORT;
327 wake_up(&req->uc_sleep);
328 }
329
330 list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
331 list_del(&req->uc_chain);
332
333 req->uc_flags |= CODA_REQ_ABORT;
334 wake_up(&req->uc_sleep);
335 }
336
337 file->private_data = NULL;
338 vcp->vc_inuse--;
339 mutex_unlock(&vcp->vc_mutex);
340 return 0;
341}
342
343
344static const struct file_operations coda_psdev_fops = {
345 .owner = THIS_MODULE,
346 .read = coda_psdev_read,
347 .write = coda_psdev_write,
348 .poll = coda_psdev_poll,
349 .unlocked_ioctl = coda_psdev_ioctl,
350 .open = coda_psdev_open,
351 .release = coda_psdev_release,
352 .llseek = noop_llseek,
353};
354
355static int init_coda_psdev(void)
356{
357 int i, err = 0;
358 if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
359 pr_err("%s: unable to get major %d\n",
360 __func__, CODA_PSDEV_MAJOR);
361 return -EIO;
362 }
363 coda_psdev_class = class_create(THIS_MODULE, "coda");
364 if (IS_ERR(coda_psdev_class)) {
365 err = PTR_ERR(coda_psdev_class);
366 goto out_chrdev;
367 }
368 for (i = 0; i < MAX_CODADEVS; i++) {
369 mutex_init(&(&coda_comms[i])->vc_mutex);
370 device_create(coda_psdev_class, NULL,
371 MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
372 }
373 coda_sysctl_init();
374 goto out;
375
376out_chrdev:
377 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
378out:
379 return err;
380}
381
382MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
383MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
384MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
385MODULE_LICENSE("GPL");
386MODULE_VERSION("6.6");
387
388static int __init init_coda(void)
389{
390 int status;
391 int i;
392
393 status = coda_init_inodecache();
394 if (status)
395 goto out2;
396 status = init_coda_psdev();
397 if ( status ) {
398 pr_warn("Problem (%d) in init_coda_psdev\n", status);
399 goto out1;
400 }
401
402 status = register_filesystem(&coda_fs_type);
403 if (status) {
404 pr_warn("failed to register filesystem!\n");
405 goto out;
406 }
407 return 0;
408out:
409 for (i = 0; i < MAX_CODADEVS; i++)
410 device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
411 class_destroy(coda_psdev_class);
412 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
413 coda_sysctl_clean();
414out1:
415 coda_destroy_inodecache();
416out2:
417 return status;
418}
419
420static void __exit exit_coda(void)
421{
422 int err, i;
423
424 err = unregister_filesystem(&coda_fs_type);
425 if (err != 0)
426 pr_warn("failed to unregister filesystem\n");
427 for (i = 0; i < MAX_CODADEVS; i++)
428 device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
429 class_destroy(coda_psdev_class);
430 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
431 coda_sysctl_clean();
432 coda_destroy_inodecache();
433}
434
435module_init(init_coda);
436module_exit(exit_coda);
437
1/*
2 * An implementation of a loadable kernel mode driver providing
3 * multiple kernel/user space bidirectional communications links.
4 *
5 * Author: Alan Cox <alan@lxorguk.ukuu.org.uk>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * Adapted to become the Linux 2.0 Coda pseudo device
13 * Peter Braam <braam@maths.ox.ac.uk>
14 * Michael Callahan <mjc@emmy.smith.edu>
15 *
16 * Changes for Linux 2.1
17 * Copyright (c) 1997 Carnegie-Mellon University
18 */
19
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 <asm/io.h>
41#include <asm/poll.h>
42#include <asm/uaccess.h>
43
44#include <linux/coda.h>
45#include <linux/coda_psdev.h>
46
47#include "coda_linux.h"
48
49#include "coda_int.h"
50
51/* statistics */
52int coda_hard; /* allows signals during upcalls */
53unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
54
55
56struct venus_comm coda_comms[MAX_CODADEVS];
57static struct class *coda_psdev_class;
58
59/*
60 * Device operations
61 */
62
63static unsigned int coda_psdev_poll(struct file *file, poll_table * wait)
64{
65 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
66 unsigned int mask = POLLOUT | POLLWRNORM;
67
68 poll_wait(file, &vcp->vc_waitq, wait);
69 mutex_lock(&vcp->vc_mutex);
70 if (!list_empty(&vcp->vc_pending))
71 mask |= POLLIN | POLLRDNORM;
72 mutex_unlock(&vcp->vc_mutex);
73
74 return mask;
75}
76
77static long coda_psdev_ioctl(struct file * filp, unsigned int cmd, unsigned long arg)
78{
79 unsigned int data;
80
81 switch(cmd) {
82 case CIOC_KERNEL_VERSION:
83 data = CODA_KERNEL_VERSION;
84 return put_user(data, (int __user *) arg);
85 default:
86 return -ENOTTY;
87 }
88
89 return 0;
90}
91
92/*
93 * Receive a message written by Venus to the psdev
94 */
95
96static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
97 size_t nbytes, loff_t *off)
98{
99 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
100 struct upc_req *req = NULL;
101 struct upc_req *tmp;
102 struct list_head *lh;
103 struct coda_in_hdr hdr;
104 ssize_t retval = 0, count = 0;
105 int error;
106
107 /* Peek at the opcode, uniquefier */
108 if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
109 return -EFAULT;
110
111 if (DOWNCALL(hdr.opcode)) {
112 union outputArgs *dcbuf;
113 int size = sizeof(*dcbuf);
114
115 if ( nbytes < sizeof(struct coda_out_hdr) ) {
116 printk("coda_downcall opc %d uniq %d, not enough!\n",
117 hdr.opcode, hdr.unique);
118 count = nbytes;
119 goto out;
120 }
121 if ( nbytes > size ) {
122 printk("Coda: downcall opc %d, uniq %d, too much!",
123 hdr.opcode, hdr.unique);
124 nbytes = size;
125 }
126 CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
127 if (copy_from_user(dcbuf, buf, nbytes)) {
128 CODA_FREE(dcbuf, nbytes);
129 retval = -EFAULT;
130 goto out;
131 }
132
133 /* what downcall errors does Venus handle ? */
134 error = coda_downcall(vcp, hdr.opcode, dcbuf);
135
136 CODA_FREE(dcbuf, nbytes);
137 if (error) {
138 printk("psdev_write: coda_downcall error: %d\n", error);
139 retval = error;
140 goto out;
141 }
142 count = nbytes;
143 goto out;
144 }
145
146 /* Look for the message on the processing queue. */
147 mutex_lock(&vcp->vc_mutex);
148 list_for_each(lh, &vcp->vc_processing) {
149 tmp = list_entry(lh, struct upc_req , uc_chain);
150 if (tmp->uc_unique == hdr.unique) {
151 req = tmp;
152 list_del(&req->uc_chain);
153 break;
154 }
155 }
156 mutex_unlock(&vcp->vc_mutex);
157
158 if (!req) {
159 printk("psdev_write: msg (%d, %d) not found\n",
160 hdr.opcode, hdr.unique);
161 retval = -ESRCH;
162 goto out;
163 }
164
165 /* move data into response buffer. */
166 if (req->uc_outSize < nbytes) {
167 printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
168 req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
169 nbytes = req->uc_outSize; /* don't have more space! */
170 }
171 if (copy_from_user(req->uc_data, buf, nbytes)) {
172 req->uc_flags |= CODA_REQ_ABORT;
173 wake_up(&req->uc_sleep);
174 retval = -EFAULT;
175 goto out;
176 }
177
178 /* adjust outsize. is this useful ?? */
179 req->uc_outSize = nbytes;
180 req->uc_flags |= CODA_REQ_WRITE;
181 count = nbytes;
182
183 /* Convert filedescriptor into a file handle */
184 if (req->uc_opcode == CODA_OPEN_BY_FD) {
185 struct coda_open_by_fd_out *outp =
186 (struct coda_open_by_fd_out *)req->uc_data;
187 if (!outp->oh.result)
188 outp->fh = fget(outp->fd);
189 }
190
191 wake_up(&req->uc_sleep);
192out:
193 return(count ? count : retval);
194}
195
196/*
197 * Read a message from the kernel to Venus
198 */
199
200static ssize_t coda_psdev_read(struct file * file, char __user * buf,
201 size_t nbytes, loff_t *off)
202{
203 DECLARE_WAITQUEUE(wait, current);
204 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
205 struct upc_req *req;
206 ssize_t retval = 0, count = 0;
207
208 if (nbytes == 0)
209 return 0;
210
211 mutex_lock(&vcp->vc_mutex);
212
213 add_wait_queue(&vcp->vc_waitq, &wait);
214 set_current_state(TASK_INTERRUPTIBLE);
215
216 while (list_empty(&vcp->vc_pending)) {
217 if (file->f_flags & O_NONBLOCK) {
218 retval = -EAGAIN;
219 break;
220 }
221 if (signal_pending(current)) {
222 retval = -ERESTARTSYS;
223 break;
224 }
225 mutex_unlock(&vcp->vc_mutex);
226 schedule();
227 mutex_lock(&vcp->vc_mutex);
228 }
229
230 set_current_state(TASK_RUNNING);
231 remove_wait_queue(&vcp->vc_waitq, &wait);
232
233 if (retval)
234 goto out;
235
236 req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
237 list_del(&req->uc_chain);
238
239 /* Move the input args into userspace */
240 count = req->uc_inSize;
241 if (nbytes < req->uc_inSize) {
242 printk ("psdev_read: Venus read %ld bytes of %d in message\n",
243 (long)nbytes, req->uc_inSize);
244 count = nbytes;
245 }
246
247 if (copy_to_user(buf, req->uc_data, count))
248 retval = -EFAULT;
249
250 /* If request was not a signal, enqueue and don't free */
251 if (!(req->uc_flags & CODA_REQ_ASYNC)) {
252 req->uc_flags |= CODA_REQ_READ;
253 list_add_tail(&(req->uc_chain), &vcp->vc_processing);
254 goto out;
255 }
256
257 CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
258 kfree(req);
259out:
260 mutex_unlock(&vcp->vc_mutex);
261 return (count ? count : retval);
262}
263
264static int coda_psdev_open(struct inode * inode, struct file * file)
265{
266 struct venus_comm *vcp;
267 int idx, err;
268
269 idx = iminor(inode);
270 if (idx < 0 || idx >= MAX_CODADEVS)
271 return -ENODEV;
272
273 err = -EBUSY;
274 vcp = &coda_comms[idx];
275 mutex_lock(&vcp->vc_mutex);
276
277 if (!vcp->vc_inuse) {
278 vcp->vc_inuse++;
279
280 INIT_LIST_HEAD(&vcp->vc_pending);
281 INIT_LIST_HEAD(&vcp->vc_processing);
282 init_waitqueue_head(&vcp->vc_waitq);
283 vcp->vc_sb = NULL;
284 vcp->vc_seq = 0;
285
286 file->private_data = vcp;
287 err = 0;
288 }
289
290 mutex_unlock(&vcp->vc_mutex);
291 return err;
292}
293
294
295static int coda_psdev_release(struct inode * inode, struct file * file)
296{
297 struct venus_comm *vcp = (struct venus_comm *) file->private_data;
298 struct upc_req *req, *tmp;
299
300 if (!vcp || !vcp->vc_inuse ) {
301 printk("psdev_release: Not open.\n");
302 return -1;
303 }
304
305 mutex_lock(&vcp->vc_mutex);
306
307 /* Wakeup clients so they can return. */
308 list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
309 list_del(&req->uc_chain);
310
311 /* Async requests need to be freed here */
312 if (req->uc_flags & CODA_REQ_ASYNC) {
313 CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
314 kfree(req);
315 continue;
316 }
317 req->uc_flags |= CODA_REQ_ABORT;
318 wake_up(&req->uc_sleep);
319 }
320
321 list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
322 list_del(&req->uc_chain);
323
324 req->uc_flags |= CODA_REQ_ABORT;
325 wake_up(&req->uc_sleep);
326 }
327
328 file->private_data = NULL;
329 vcp->vc_inuse--;
330 mutex_unlock(&vcp->vc_mutex);
331 return 0;
332}
333
334
335static const struct file_operations coda_psdev_fops = {
336 .owner = THIS_MODULE,
337 .read = coda_psdev_read,
338 .write = coda_psdev_write,
339 .poll = coda_psdev_poll,
340 .unlocked_ioctl = coda_psdev_ioctl,
341 .open = coda_psdev_open,
342 .release = coda_psdev_release,
343 .llseek = noop_llseek,
344};
345
346static int init_coda_psdev(void)
347{
348 int i, err = 0;
349 if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
350 printk(KERN_ERR "coda_psdev: unable to get major %d\n",
351 CODA_PSDEV_MAJOR);
352 return -EIO;
353 }
354 coda_psdev_class = class_create(THIS_MODULE, "coda");
355 if (IS_ERR(coda_psdev_class)) {
356 err = PTR_ERR(coda_psdev_class);
357 goto out_chrdev;
358 }
359 for (i = 0; i < MAX_CODADEVS; i++) {
360 mutex_init(&(&coda_comms[i])->vc_mutex);
361 device_create(coda_psdev_class, NULL,
362 MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
363 }
364 coda_sysctl_init();
365 goto out;
366
367out_chrdev:
368 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
369out:
370 return err;
371}
372
373MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
374MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
375MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
376MODULE_LICENSE("GPL");
377MODULE_VERSION("6.6");
378
379static int __init init_coda(void)
380{
381 int status;
382 int i;
383
384 status = coda_init_inodecache();
385 if (status)
386 goto out2;
387 status = init_coda_psdev();
388 if ( status ) {
389 printk("Problem (%d) in init_coda_psdev\n", status);
390 goto out1;
391 }
392
393 status = register_filesystem(&coda_fs_type);
394 if (status) {
395 printk("coda: failed to register filesystem!\n");
396 goto out;
397 }
398 return 0;
399out:
400 for (i = 0; i < MAX_CODADEVS; i++)
401 device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
402 class_destroy(coda_psdev_class);
403 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
404 coda_sysctl_clean();
405out1:
406 coda_destroy_inodecache();
407out2:
408 return status;
409}
410
411static void __exit exit_coda(void)
412{
413 int err, i;
414
415 err = unregister_filesystem(&coda_fs_type);
416 if ( err != 0 ) {
417 printk("coda: failed to unregister filesystem\n");
418 }
419 for (i = 0; i < MAX_CODADEVS; i++)
420 device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
421 class_destroy(coda_psdev_class);
422 unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
423 coda_sysctl_clean();
424 coda_destroy_inodecache();
425}
426
427module_init(init_coda);
428module_exit(exit_coda);
429