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12
13#define KMSG_COMPONENT "vmlogrdr"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/slab.h>
19#include <linux/errno.h>
20#include <linux/types.h>
21#include <linux/interrupt.h>
22#include <linux/spinlock.h>
23#include <linux/atomic.h>
24#include <asm/uaccess.h>
25#include <asm/cpcmd.h>
26#include <asm/debug.h>
27#include <asm/ebcdic.h>
28#include <net/iucv/iucv.h>
29#include <linux/kmod.h>
30#include <linux/cdev.h>
31#include <linux/device.h>
32#include <linux/string.h>
33
34MODULE_AUTHOR
35 ("(C) 2004 IBM Corporation by Xenia Tkatschow (xenia@us.ibm.com)\n"
36 " Stefan Weinhuber (wein@de.ibm.com)");
37MODULE_DESCRIPTION ("Character device driver for reading z/VM "
38 "system service records.");
39MODULE_LICENSE("GPL");
40
41
42
43
44
45
46
47
48
49#define NET_BUFFER_SIZE (PAGE_SIZE - sizeof(int) - sizeof(FENCE))
50
51
52
53
54
55
56
57
58
59
60
61struct vmlogrdr_priv_t {
62 char system_service[8];
63 char internal_name[8];
64 char recording_name[8];
65 struct iucv_path *path;
66 int connection_established;
67 int iucv_path_severed;
68 struct iucv_message local_interrupt_buffer;
69 atomic_t receive_ready;
70 int minor_num;
71 char * buffer;
72 char * current_position;
73 int remaining;
74 ulong residual_length;
75 int buffer_free;
76 int dev_in_use;
77 spinlock_t priv_lock;
78 struct device *device;
79 struct device *class_device;
80 int autorecording;
81 int autopurge;
82};
83
84
85
86
87
88static int vmlogrdr_open(struct inode *, struct file *);
89static int vmlogrdr_release(struct inode *, struct file *);
90static ssize_t vmlogrdr_read (struct file *filp, char __user *data,
91 size_t count, loff_t * ppos);
92
93static const struct file_operations vmlogrdr_fops = {
94 .owner = THIS_MODULE,
95 .open = vmlogrdr_open,
96 .release = vmlogrdr_release,
97 .read = vmlogrdr_read,
98 .llseek = no_llseek,
99};
100
101
102static void vmlogrdr_iucv_path_complete(struct iucv_path *, u8 ipuser[16]);
103static void vmlogrdr_iucv_path_severed(struct iucv_path *, u8 ipuser[16]);
104static void vmlogrdr_iucv_message_pending(struct iucv_path *,
105 struct iucv_message *);
106
107
108static struct iucv_handler vmlogrdr_iucv_handler = {
109 .path_complete = vmlogrdr_iucv_path_complete,
110 .path_severed = vmlogrdr_iucv_path_severed,
111 .message_pending = vmlogrdr_iucv_message_pending,
112};
113
114
115static DECLARE_WAIT_QUEUE_HEAD(conn_wait_queue);
116static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue);
117
118
119
120
121
122
123
124
125static struct vmlogrdr_priv_t sys_ser[] = {
126 { .system_service = "*LOGREC ",
127 .internal_name = "logrec",
128 .recording_name = "EREP",
129 .minor_num = 0,
130 .buffer_free = 1,
131 .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[0].priv_lock),
132 .autorecording = 1,
133 .autopurge = 1,
134 },
135 { .system_service = "*ACCOUNT",
136 .internal_name = "account",
137 .recording_name = "ACCOUNT",
138 .minor_num = 1,
139 .buffer_free = 1,
140 .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[1].priv_lock),
141 .autorecording = 1,
142 .autopurge = 1,
143 },
144 { .system_service = "*SYMPTOM",
145 .internal_name = "symptom",
146 .recording_name = "SYMPTOM",
147 .minor_num = 2,
148 .buffer_free = 1,
149 .priv_lock = __SPIN_LOCK_UNLOCKED(sys_ser[2].priv_lock),
150 .autorecording = 1,
151 .autopurge = 1,
152 }
153};
154
155#define MAXMINOR (sizeof(sys_ser)/sizeof(struct vmlogrdr_priv_t))
156
157static char FENCE[] = {"EOR"};
158static int vmlogrdr_major = 0;
159static struct cdev *vmlogrdr_cdev = NULL;
160static int recording_class_AB;
161
162
163static void vmlogrdr_iucv_path_complete(struct iucv_path *path, u8 ipuser[16])
164{
165 struct vmlogrdr_priv_t * logptr = path->private;
166
167 spin_lock(&logptr->priv_lock);
168 logptr->connection_established = 1;
169 spin_unlock(&logptr->priv_lock);
170 wake_up(&conn_wait_queue);
171}
172
173
174static void vmlogrdr_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
175{
176 struct vmlogrdr_priv_t * logptr = path->private;
177 u8 reason = (u8) ipuser[8];
178
179 pr_err("vmlogrdr: connection severed with reason %i\n", reason);
180
181 iucv_path_sever(path, NULL);
182 kfree(path);
183 logptr->path = NULL;
184
185 spin_lock(&logptr->priv_lock);
186 logptr->connection_established = 0;
187 logptr->iucv_path_severed = 1;
188 spin_unlock(&logptr->priv_lock);
189
190 wake_up(&conn_wait_queue);
191
192 wake_up_interruptible(&read_wait_queue);
193}
194
195
196static void vmlogrdr_iucv_message_pending(struct iucv_path *path,
197 struct iucv_message *msg)
198{
199 struct vmlogrdr_priv_t * logptr = path->private;
200
201
202
203
204
205
206 spin_lock(&logptr->priv_lock);
207 memcpy(&logptr->local_interrupt_buffer, msg, sizeof(*msg));
208 atomic_inc(&logptr->receive_ready);
209 spin_unlock(&logptr->priv_lock);
210 wake_up_interruptible(&read_wait_queue);
211}
212
213
214static int vmlogrdr_get_recording_class_AB(void)
215{
216 static const char cp_command[] = "QUERY COMMAND RECORDING ";
217 char cp_response[80];
218 char *tail;
219 int len,i;
220
221 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
222 len = strnlen(cp_response,sizeof(cp_response));
223
224 tail=strnchr(cp_response,len,'=');
225 if (!tail)
226 return 0;
227 tail++;
228 if (!strncmp("ANY",tail,3))
229 return 1;
230 if (!strncmp("NONE",tail,4))
231 return 0;
232
233
234
235
236 for (i=tail-cp_response; i<len; i++)
237 if ( cp_response[i]=='A' || cp_response[i]=='B' )
238 return 1;
239 return 0;
240}
241
242
243static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr,
244 int action, int purge)
245{
246
247 char cp_command[80];
248 char cp_response[160];
249 char *onoff, *qid_string;
250 int rc;
251
252 onoff = ((action == 1) ? "ON" : "OFF");
253 qid_string = ((recording_class_AB == 1) ? " QID * " : "");
254
255
256
257
258
259
260
261
262 if (purge && (action == 1)) {
263 memset(cp_command, 0x00, sizeof(cp_command));
264 memset(cp_response, 0x00, sizeof(cp_response));
265 snprintf(cp_command, sizeof(cp_command),
266 "RECORDING %s PURGE %s",
267 logptr->recording_name,
268 qid_string);
269 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
270 }
271
272 memset(cp_command, 0x00, sizeof(cp_command));
273 memset(cp_response, 0x00, sizeof(cp_response));
274 snprintf(cp_command, sizeof(cp_command), "RECORDING %s %s %s",
275 logptr->recording_name,
276 onoff,
277 qid_string);
278 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
279
280
281
282
283
284
285 if (strstr(cp_response,"Command complete"))
286 rc = 0;
287 else
288 rc = -EIO;
289
290
291
292
293
294 if (purge && (action == 0)) {
295 memset(cp_command, 0x00, sizeof(cp_command));
296 memset(cp_response, 0x00, sizeof(cp_response));
297 snprintf(cp_command, sizeof(cp_command),
298 "RECORDING %s PURGE %s",
299 logptr->recording_name,
300 qid_string);
301 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
302 }
303
304 return rc;
305}
306
307
308static int vmlogrdr_open (struct inode *inode, struct file *filp)
309{
310 int dev_num = 0;
311 struct vmlogrdr_priv_t * logptr = NULL;
312 int connect_rc = 0;
313 int ret;
314
315 dev_num = iminor(inode);
316 if (dev_num > MAXMINOR)
317 return -ENODEV;
318 logptr = &sys_ser[dev_num];
319
320
321
322
323 if (filp->f_flags & O_NONBLOCK)
324 return -EOPNOTSUPP;
325
326
327 spin_lock_bh(&logptr->priv_lock);
328 if (logptr->dev_in_use) {
329 spin_unlock_bh(&logptr->priv_lock);
330 return -EBUSY;
331 }
332 logptr->dev_in_use = 1;
333 logptr->connection_established = 0;
334 logptr->iucv_path_severed = 0;
335 atomic_set(&logptr->receive_ready, 0);
336 logptr->buffer_free = 1;
337 spin_unlock_bh(&logptr->priv_lock);
338
339
340 filp->private_data = logptr;
341 filp->f_op = &vmlogrdr_fops;
342
343
344 if (logptr->autorecording) {
345 ret = vmlogrdr_recording(logptr,1,logptr->autopurge);
346 if (ret)
347 pr_warning("vmlogrdr: failed to start "
348 "recording automatically\n");
349 }
350
351
352 logptr->path = iucv_path_alloc(10, 0, GFP_KERNEL);
353 if (!logptr->path)
354 goto out_dev;
355 connect_rc = iucv_path_connect(logptr->path, &vmlogrdr_iucv_handler,
356 logptr->system_service, NULL, NULL,
357 logptr);
358 if (connect_rc) {
359 pr_err("vmlogrdr: iucv connection to %s "
360 "failed with rc %i \n",
361 logptr->system_service, connect_rc);
362 goto out_path;
363 }
364
365
366
367
368
369 wait_event(conn_wait_queue, (logptr->connection_established)
370 || (logptr->iucv_path_severed));
371 if (logptr->iucv_path_severed)
372 goto out_record;
373 nonseekable_open(inode, filp);
374 return 0;
375
376out_record:
377 if (logptr->autorecording)
378 vmlogrdr_recording(logptr,0,logptr->autopurge);
379out_path:
380 kfree(logptr->path);
381 logptr->path = NULL;
382out_dev:
383 logptr->dev_in_use = 0;
384 return -EIO;
385}
386
387
388static int vmlogrdr_release (struct inode *inode, struct file *filp)
389{
390 int ret;
391
392 struct vmlogrdr_priv_t * logptr = filp->private_data;
393
394 iucv_path_sever(logptr->path, NULL);
395 kfree(logptr->path);
396 logptr->path = NULL;
397 if (logptr->autorecording) {
398 ret = vmlogrdr_recording(logptr,0,logptr->autopurge);
399 if (ret)
400 pr_warning("vmlogrdr: failed to stop "
401 "recording automatically\n");
402 }
403 logptr->dev_in_use = 0;
404
405 return 0;
406}
407
408
409static int vmlogrdr_receive_data(struct vmlogrdr_priv_t *priv)
410{
411 int rc, *temp;
412
413
414
415
416 int user_data_count, iucv_data_count;
417 char * buffer;
418
419 if (atomic_read(&priv->receive_ready)) {
420 spin_lock_bh(&priv->priv_lock);
421 if (priv->residual_length){
422
423 iucv_data_count = priv->residual_length;
424 user_data_count = 0;
425 buffer = priv->buffer;
426 } else {
427
428
429
430
431 iucv_data_count = priv->local_interrupt_buffer.length;
432 user_data_count = sizeof(int);
433 temp = (int*)priv->buffer;
434 *temp= iucv_data_count + sizeof(FENCE);
435 buffer = priv->buffer + sizeof(int);
436 }
437
438
439
440
441 if (iucv_data_count > NET_BUFFER_SIZE)
442 iucv_data_count = NET_BUFFER_SIZE;
443 rc = iucv_message_receive(priv->path,
444 &priv->local_interrupt_buffer,
445 0, buffer, iucv_data_count,
446 &priv->residual_length);
447 spin_unlock_bh(&priv->priv_lock);
448
449
450
451
452 if (rc == 5)
453 rc = 0;
454 if (rc == 9)
455 atomic_set(&priv->receive_ready, 0);
456 } else {
457 rc = 1;
458 }
459 if (!rc) {
460 priv->buffer_free = 0;
461 user_data_count += iucv_data_count;
462 priv->current_position = priv->buffer;
463 if (priv->residual_length == 0){
464
465
466 atomic_dec(&priv->receive_ready);
467 buffer = priv->buffer + user_data_count;
468 memcpy(buffer, FENCE, sizeof(FENCE));
469 user_data_count += sizeof(FENCE);
470 }
471 priv->remaining = user_data_count;
472 }
473
474 return rc;
475}
476
477
478static ssize_t vmlogrdr_read(struct file *filp, char __user *data,
479 size_t count, loff_t * ppos)
480{
481 int rc;
482 struct vmlogrdr_priv_t * priv = filp->private_data;
483
484 while (priv->buffer_free) {
485 rc = vmlogrdr_receive_data(priv);
486 if (rc) {
487 rc = wait_event_interruptible(read_wait_queue,
488 atomic_read(&priv->receive_ready));
489 if (rc)
490 return rc;
491 }
492 }
493
494 if (count > priv->remaining)
495 count = priv->remaining;
496
497 if (copy_to_user(data, priv->current_position, count))
498 return -EFAULT;
499
500 *ppos += count;
501 priv->current_position += count;
502 priv->remaining -= count;
503
504
505 if (priv->remaining == 0)
506 priv->buffer_free = 1;
507
508 return count;
509}
510
511static ssize_t vmlogrdr_autopurge_store(struct device * dev,
512 struct device_attribute *attr,
513 const char * buf, size_t count)
514{
515 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
516 ssize_t ret = count;
517
518 switch (buf[0]) {
519 case '0':
520 priv->autopurge=0;
521 break;
522 case '1':
523 priv->autopurge=1;
524 break;
525 default:
526 ret = -EINVAL;
527 }
528 return ret;
529}
530
531
532static ssize_t vmlogrdr_autopurge_show(struct device *dev,
533 struct device_attribute *attr,
534 char *buf)
535{
536 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
537 return sprintf(buf, "%u\n", priv->autopurge);
538}
539
540
541static DEVICE_ATTR(autopurge, 0644, vmlogrdr_autopurge_show,
542 vmlogrdr_autopurge_store);
543
544
545static ssize_t vmlogrdr_purge_store(struct device * dev,
546 struct device_attribute *attr,
547 const char * buf, size_t count)
548{
549
550 char cp_command[80];
551 char cp_response[80];
552 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
553
554 if (buf[0] != '1')
555 return -EINVAL;
556
557 memset(cp_command, 0x00, sizeof(cp_command));
558 memset(cp_response, 0x00, sizeof(cp_response));
559
560
561
562
563
564
565
566
567 if (recording_class_AB)
568 snprintf(cp_command, sizeof(cp_command),
569 "RECORDING %s PURGE QID * ",
570 priv->recording_name);
571 else
572 snprintf(cp_command, sizeof(cp_command),
573 "RECORDING %s PURGE ",
574 priv->recording_name);
575
576 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
577
578 return count;
579}
580
581
582static DEVICE_ATTR(purge, 0200, NULL, vmlogrdr_purge_store);
583
584
585static ssize_t vmlogrdr_autorecording_store(struct device *dev,
586 struct device_attribute *attr,
587 const char *buf, size_t count)
588{
589 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
590 ssize_t ret = count;
591
592 switch (buf[0]) {
593 case '0':
594 priv->autorecording=0;
595 break;
596 case '1':
597 priv->autorecording=1;
598 break;
599 default:
600 ret = -EINVAL;
601 }
602 return ret;
603}
604
605
606static ssize_t vmlogrdr_autorecording_show(struct device *dev,
607 struct device_attribute *attr,
608 char *buf)
609{
610 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
611 return sprintf(buf, "%u\n", priv->autorecording);
612}
613
614
615static DEVICE_ATTR(autorecording, 0644, vmlogrdr_autorecording_show,
616 vmlogrdr_autorecording_store);
617
618
619static ssize_t vmlogrdr_recording_store(struct device * dev,
620 struct device_attribute *attr,
621 const char * buf, size_t count)
622{
623 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
624 ssize_t ret;
625
626 switch (buf[0]) {
627 case '0':
628 ret = vmlogrdr_recording(priv,0,0);
629 break;
630 case '1':
631 ret = vmlogrdr_recording(priv,1,0);
632 break;
633 default:
634 ret = -EINVAL;
635 }
636 if (ret)
637 return ret;
638 else
639 return count;
640
641}
642
643
644static DEVICE_ATTR(recording, 0200, NULL, vmlogrdr_recording_store);
645
646
647static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver,
648 char *buf)
649{
650
651 static const char cp_command[] = "QUERY RECORDING ";
652 int len;
653
654 cpcmd(cp_command, buf, 4096, NULL);
655 len = strlen(buf);
656 return len;
657}
658static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show,
659 NULL);
660static struct attribute *vmlogrdr_drv_attrs[] = {
661 &driver_attr_recording_status.attr,
662 NULL,
663};
664static struct attribute_group vmlogrdr_drv_attr_group = {
665 .attrs = vmlogrdr_drv_attrs,
666};
667static const struct attribute_group *vmlogrdr_drv_attr_groups[] = {
668 &vmlogrdr_drv_attr_group,
669 NULL,
670};
671
672static struct attribute *vmlogrdr_attrs[] = {
673 &dev_attr_autopurge.attr,
674 &dev_attr_purge.attr,
675 &dev_attr_autorecording.attr,
676 &dev_attr_recording.attr,
677 NULL,
678};
679static struct attribute_group vmlogrdr_attr_group = {
680 .attrs = vmlogrdr_attrs,
681};
682static const struct attribute_group *vmlogrdr_attr_groups[] = {
683 &vmlogrdr_attr_group,
684 NULL,
685};
686
687static int vmlogrdr_pm_prepare(struct device *dev)
688{
689 int rc;
690 struct vmlogrdr_priv_t *priv = dev_get_drvdata(dev);
691
692 rc = 0;
693 if (priv) {
694 spin_lock_bh(&priv->priv_lock);
695 if (priv->dev_in_use)
696 rc = -EBUSY;
697 spin_unlock_bh(&priv->priv_lock);
698 }
699 if (rc)
700 pr_err("vmlogrdr: device %s is busy. Refuse to suspend.\n",
701 dev_name(dev));
702 return rc;
703}
704
705
706static const struct dev_pm_ops vmlogrdr_pm_ops = {
707 .prepare = vmlogrdr_pm_prepare,
708};
709
710static struct class *vmlogrdr_class;
711static struct device_driver vmlogrdr_driver = {
712 .name = "vmlogrdr",
713 .bus = &iucv_bus,
714 .pm = &vmlogrdr_pm_ops,
715 .groups = vmlogrdr_drv_attr_groups,
716};
717
718static int vmlogrdr_register_driver(void)
719{
720 int ret;
721
722
723 ret = iucv_register(&vmlogrdr_iucv_handler, 1);
724 if (ret)
725 goto out;
726
727 ret = driver_register(&vmlogrdr_driver);
728 if (ret)
729 goto out_iucv;
730
731 vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr");
732 if (IS_ERR(vmlogrdr_class)) {
733 ret = PTR_ERR(vmlogrdr_class);
734 vmlogrdr_class = NULL;
735 goto out_driver;
736 }
737 return 0;
738
739out_driver:
740 driver_unregister(&vmlogrdr_driver);
741out_iucv:
742 iucv_unregister(&vmlogrdr_iucv_handler, 1);
743out:
744 return ret;
745}
746
747
748static void vmlogrdr_unregister_driver(void)
749{
750 class_destroy(vmlogrdr_class);
751 vmlogrdr_class = NULL;
752 driver_unregister(&vmlogrdr_driver);
753 iucv_unregister(&vmlogrdr_iucv_handler, 1);
754}
755
756
757static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
758{
759 struct device *dev;
760 int ret;
761
762 dev = kzalloc(sizeof(struct device), GFP_KERNEL);
763 if (dev) {
764 dev_set_name(dev, priv->internal_name);
765 dev->bus = &iucv_bus;
766 dev->parent = iucv_root;
767 dev->driver = &vmlogrdr_driver;
768 dev->groups = vmlogrdr_attr_groups;
769 dev_set_drvdata(dev, priv);
770
771
772
773
774
775
776
777 dev->release = (void (*)(struct device *))kfree;
778 } else
779 return -ENOMEM;
780 ret = device_register(dev);
781 if (ret) {
782 put_device(dev);
783 return ret;
784 }
785
786 priv->class_device = device_create(vmlogrdr_class, dev,
787 MKDEV(vmlogrdr_major,
788 priv->minor_num),
789 priv, "%s", dev_name(dev));
790 if (IS_ERR(priv->class_device)) {
791 ret = PTR_ERR(priv->class_device);
792 priv->class_device=NULL;
793 device_unregister(dev);
794 return ret;
795 }
796 priv->device = dev;
797 return 0;
798}
799
800
801static int vmlogrdr_unregister_device(struct vmlogrdr_priv_t *priv)
802{
803 device_destroy(vmlogrdr_class, MKDEV(vmlogrdr_major, priv->minor_num));
804 if (priv->device != NULL) {
805 device_unregister(priv->device);
806 priv->device=NULL;
807 }
808 return 0;
809}
810
811
812static int vmlogrdr_register_cdev(dev_t dev)
813{
814 int rc = 0;
815 vmlogrdr_cdev = cdev_alloc();
816 if (!vmlogrdr_cdev) {
817 return -ENOMEM;
818 }
819 vmlogrdr_cdev->owner = THIS_MODULE;
820 vmlogrdr_cdev->ops = &vmlogrdr_fops;
821 vmlogrdr_cdev->dev = dev;
822 rc = cdev_add(vmlogrdr_cdev, vmlogrdr_cdev->dev, MAXMINOR);
823 if (!rc)
824 return 0;
825
826
827 kobject_put(&vmlogrdr_cdev->kobj);
828 vmlogrdr_cdev=NULL;
829 return rc;
830}
831
832
833static void vmlogrdr_cleanup(void)
834{
835 int i;
836
837 if (vmlogrdr_cdev) {
838 cdev_del(vmlogrdr_cdev);
839 vmlogrdr_cdev=NULL;
840 }
841 for (i=0; i < MAXMINOR; ++i ) {
842 vmlogrdr_unregister_device(&sys_ser[i]);
843 free_page((unsigned long)sys_ser[i].buffer);
844 }
845 vmlogrdr_unregister_driver();
846 if (vmlogrdr_major) {
847 unregister_chrdev_region(MKDEV(vmlogrdr_major, 0), MAXMINOR);
848 vmlogrdr_major=0;
849 }
850}
851
852
853static int __init vmlogrdr_init(void)
854{
855 int rc;
856 int i;
857 dev_t dev;
858
859 if (! MACHINE_IS_VM) {
860 pr_err("not running under VM, driver not loaded.\n");
861 return -ENODEV;
862 }
863
864 recording_class_AB = vmlogrdr_get_recording_class_AB();
865
866 rc = alloc_chrdev_region(&dev, 0, MAXMINOR, "vmlogrdr");
867 if (rc)
868 return rc;
869 vmlogrdr_major = MAJOR(dev);
870
871 rc=vmlogrdr_register_driver();
872 if (rc)
873 goto cleanup;
874
875 for (i=0; i < MAXMINOR; ++i ) {
876 sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL);
877 if (!sys_ser[i].buffer) {
878 rc = -ENOMEM;
879 break;
880 }
881 sys_ser[i].current_position = sys_ser[i].buffer;
882 rc=vmlogrdr_register_device(&sys_ser[i]);
883 if (rc)
884 break;
885 }
886 if (rc)
887 goto cleanup;
888
889 rc = vmlogrdr_register_cdev(dev);
890 if (rc)
891 goto cleanup;
892 return 0;
893
894cleanup:
895 vmlogrdr_cleanup();
896 return rc;
897}
898
899
900static void __exit vmlogrdr_exit(void)
901{
902 vmlogrdr_cleanup();
903 return;
904}
905
906
907module_init(vmlogrdr_init);
908module_exit(vmlogrdr_exit);
909