?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'regmap-v3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6.git] / drivers / s390 / block / dasd_devmap.c
bloba71bb8aaca1de2a86497f1c7b9e07155019c47a0
1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999,2001
8 *
9 * Device mapping and dasd= parameter parsing functions. All devmap
10 * functions may not be called from interrupt context. In particular
11 * dasd_get_device is a no-no from interrupt context.
12 *
13 */
14
15 #define KMSG_COMPONENT "dasd"
16
17 #include <linux/ctype.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21
22 #include <asm/debug.h>
23 #include <asm/uaccess.h>
24 #include <asm/ipl.h>
25
26 /* This is ugly... */
27 #define PRINTK_HEADER "dasd_devmap:"
28 #define DASD_BUS_ID_SIZE 20
29
30 #include "dasd_int.h"
31
32 struct kmem_cache *dasd_page_cache;
33 EXPORT_SYMBOL_GPL(dasd_page_cache);
34
35 /*
36 * dasd_devmap_t is used to store the features and the relation
37 * between device number and device index. To find a dasd_devmap_t
38 * that corresponds to a device number of a device index each
39 * dasd_devmap_t is added to two linked lists, one to search by
40 * the device number and one to search by the device index. As
41 * soon as big minor numbers are available the device index list
42 * can be removed since the device number will then be identical
43 * to the device index.
44 */
45 struct dasd_devmap {
46 struct list_head list;
47 char bus_id[DASD_BUS_ID_SIZE];
48 unsigned int devindex;
49 unsigned short features;
50 struct dasd_device *device;
51 };
52
53 /*
54 * Parameter parsing functions for dasd= parameter. The syntax is:
55 * <devno> : (0x)?[0-9a-fA-F]+
56 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
57 * <feature> : ro
58 * <feature_list> : \(<feature>(:<feature>)*\)
59 * <devno-range> : <devno>(-<devno>)?<feature_list>?
60 * <busid-range> : <busid>(-<busid>)?<feature_list>?
61 * <devices> : <devno-range>|<busid-range>
62 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
63 *
64 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
65 */
66
67 int dasd_probeonly = 0; /* is true, when probeonly mode is active */
68 int dasd_autodetect = 0; /* is true, when autodetection is active */
69 int dasd_nopav = 0; /* is true, when PAV is disabled */
70 EXPORT_SYMBOL_GPL(dasd_nopav);
71 int dasd_nofcx; /* disable High Performance Ficon */
72 EXPORT_SYMBOL_GPL(dasd_nofcx);
73
74 /*
75 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
76 * it is named 'dasd' to directly be filled by insmod with the comma separated
77 * strings when running as a module.
78 */
79 static char *dasd[256];
80 module_param_array(dasd, charp, NULL, 0);
81
82 /*
83 * Single spinlock to protect devmap and servermap structures and lists.
84 */
85 static DEFINE_SPINLOCK(dasd_devmap_lock);
86
87 /*
88 * Hash lists for devmap structures.
89 */
90 static struct list_head dasd_hashlists[256];
91 int dasd_max_devindex;
92
93 static struct dasd_devmap *dasd_add_busid(const char *, int);
94
95 static inline int
96 dasd_hash_busid(const char *bus_id)
97 {
98 int hash, i;
99
100 hash = 0;
101 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
102 hash += *bus_id;
103 return hash & 0xff;
104 }
105
106 #ifndef MODULE
107 /*
108 * The parameter parsing functions for builtin-drivers are called
109 * before kmalloc works. Store the pointers to the parameters strings
110 * into dasd[] for later processing.
111 */
112 static int __init
113 dasd_call_setup(char *str)
114 {
115 static int count = 0;
116
117 if (count < 256)
118 dasd[count++] = str;
119 return 1;
120 }
121
122 __setup ("dasd=", dasd_call_setup);
123 #endif /* #ifndef MODULE */
124
125 #define DASD_IPLDEV "ipldev"
126
127 /*
128 * Read a device busid/devno from a string.
129 */
130 static int
131
132 dasd_busid(char **str, int *id0, int *id1, int *devno)
133 {
134 int val, old_style;
135
136 /* Interpret ipldev busid */
137 if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
138 if (ipl_info.type != IPL_TYPE_CCW) {
139 pr_err("The IPL device is not a CCW device\n");
140 return -EINVAL;
141 }
142 *id0 = 0;
143 *id1 = ipl_info.data.ccw.dev_id.ssid;
144 *devno = ipl_info.data.ccw.dev_id.devno;
145 *str += strlen(DASD_IPLDEV);
146
147 return 0;
148 }
149 /* check for leading '0x' */
150 old_style = 0;
151 if ((*str)[0] == '0' && (*str)[1] == 'x') {
152 *str += 2;
153 old_style = 1;
154 }
155 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
156 return -EINVAL;
157 val = simple_strtoul(*str, str, 16);
158 if (old_style || (*str)[0] != '.') {
159 *id0 = *id1 = 0;
160 if (val < 0 || val > 0xffff)
161 return -EINVAL;
162 *devno = val;
163 return 0;
164 }
165 /* New style x.y.z busid */
166 if (val < 0 || val > 0xff)
167 return -EINVAL;
168 *id0 = val;
169 (*str)++;
170 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
171 return -EINVAL;
172 val = simple_strtoul(*str, str, 16);
173 if (val < 0 || val > 0xff || (*str)++[0] != '.')
174 return -EINVAL;
175 *id1 = val;
176 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
177 return -EINVAL;
178 val = simple_strtoul(*str, str, 16);
179 if (val < 0 || val > 0xffff)
180 return -EINVAL;
181 *devno = val;
182 return 0;
183 }
184
185 /*
186 * Read colon separated list of dasd features. Currently there is
187 * only one: "ro" for read-only devices. The default feature set
188 * is empty (value 0).
189 */
190 static int
191 dasd_feature_list(char *str, char **endp)
192 {
193 int features, len, rc;
194
195 rc = 0;
196 if (*str != '(') {
197 *endp = str;
198 return DASD_FEATURE_DEFAULT;
199 }
200 str++;
201 features = 0;
202
203 while (1) {
204 for (len = 0;
205 str[len] && str[len] != ':' && str[len] != ')'; len++);
206 if (len == 2 && !strncmp(str, "ro", 2))
207 features |= DASD_FEATURE_READONLY;
208 else if (len == 4 && !strncmp(str, "diag", 4))
209 features |= DASD_FEATURE_USEDIAG;
210 else if (len == 3 && !strncmp(str, "raw", 3))
211 features |= DASD_FEATURE_USERAW;
212 else if (len == 6 && !strncmp(str, "erplog", 6))
213 features |= DASD_FEATURE_ERPLOG;
214 else if (len == 8 && !strncmp(str, "failfast", 8))
215 features |= DASD_FEATURE_FAILFAST;
216 else {
217 pr_warning("%*s is not a supported device option\n",
218 len, str);
219 rc = -EINVAL;
220 }
221 str += len;
222 if (*str != ':')
223 break;
224 str++;
225 }
226 if (*str != ')') {
227 pr_warning("A closing parenthesis ')' is missing in the "
228 "dasd= parameter\n");
229 rc = -EINVAL;
230 } else
231 str++;
232 *endp = str;
233 if (rc != 0)
234 return rc;
235 return features;
236 }
237
238 /*
239 * Try to match the first element on the comma separated parse string
240 * with one of the known keywords. If a keyword is found, take the approprate
241 * action and return a pointer to the residual string. If the first element
242 * could not be matched to any keyword then return an error code.
243 */
244 static char *
245 dasd_parse_keyword( char *parsestring ) {
246
247 char *nextcomma, *residual_str;
248 int length;
249
250 nextcomma = strchr(parsestring,',');
251 if (nextcomma) {
252 length = nextcomma - parsestring;
253 residual_str = nextcomma + 1;
254 } else {
255 length = strlen(parsestring);
256 residual_str = parsestring + length;
257 }
258 if (strncmp("autodetect", parsestring, length) == 0) {
259 dasd_autodetect = 1;
260 pr_info("The autodetection mode has been activated\n");
261 return residual_str;
262 }
263 if (strncmp("probeonly", parsestring, length) == 0) {
264 dasd_probeonly = 1;
265 pr_info("The probeonly mode has been activated\n");
266 return residual_str;
267 }
268 if (strncmp("nopav", parsestring, length) == 0) {
269 if (MACHINE_IS_VM)
270 pr_info("'nopav' is not supported on z/VM\n");
271 else {
272 dasd_nopav = 1;
273 pr_info("PAV support has be deactivated\n");
274 }
275 return residual_str;
276 }
277 if (strncmp("nofcx", parsestring, length) == 0) {
278 dasd_nofcx = 1;
279 pr_info("High Performance FICON support has been "
280 "deactivated\n");
281 return residual_str;
282 }
283 if (strncmp("fixedbuffers", parsestring, length) == 0) {
284 if (dasd_page_cache)
285 return residual_str;
286 dasd_page_cache =
287 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
288 PAGE_SIZE, SLAB_CACHE_DMA,
289 NULL);
290 if (!dasd_page_cache)
291 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
292 "fixed buffer mode disabled.");
293 else
294 DBF_EVENT(DBF_INFO, "%s",
295 "turning on fixed buffer mode");
296 return residual_str;
297 }
298 return ERR_PTR(-EINVAL);
299 }
300
301 /*
302 * Try to interprete the first element on the comma separated parse string
303 * as a device number or a range of devices. If the interpretation is
304 * successful, create the matching dasd_devmap entries and return a pointer
305 * to the residual string.
306 * If interpretation fails or in case of an error, return an error code.
307 */
308 static char *
309 dasd_parse_range( char *parsestring ) {
310
311 struct dasd_devmap *devmap;
312 int from, from_id0, from_id1;
313 int to, to_id0, to_id1;
314 int features, rc;
315 char bus_id[DASD_BUS_ID_SIZE+1], *str;
316
317 str = parsestring;
318 rc = dasd_busid(&str, &from_id0, &from_id1, &from);
319 if (rc == 0) {
320 to = from;
321 to_id0 = from_id0;
322 to_id1 = from_id1;
323 if (*str == '-') {
324 str++;
325 rc = dasd_busid(&str, &to_id0, &to_id1, &to);
326 }
327 }
328 if (rc == 0 &&
329 (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
330 rc = -EINVAL;
331 if (rc) {
332 pr_err("%s is not a valid device range\n", parsestring);
333 return ERR_PTR(rc);
334 }
335 features = dasd_feature_list(str, &str);
336 if (features < 0)
337 return ERR_PTR(-EINVAL);
338 /* each device in dasd= parameter should be set initially online */
339 features |= DASD_FEATURE_INITIAL_ONLINE;
340 while (from <= to) {
341 sprintf(bus_id, "%01x.%01x.%04x",
342 from_id0, from_id1, from++);
343 devmap = dasd_add_busid(bus_id, features);
344 if (IS_ERR(devmap))
345 return (char *)devmap;
346 }
347 if (*str == ',')
348 return str + 1;
349 if (*str == '\0')
350 return str;
351 pr_warning("The dasd= parameter value %s has an invalid ending\n",
352 str);
353 return ERR_PTR(-EINVAL);
354 }
355
356 static char *
357 dasd_parse_next_element( char *parsestring ) {
358 char * residual_str;
359 residual_str = dasd_parse_keyword(parsestring);
360 if (!IS_ERR(residual_str))
361 return residual_str;
362 residual_str = dasd_parse_range(parsestring);
363 return residual_str;
364 }
365
366 /*
367 * Parse parameters stored in dasd[]
368 * The 'dasd=...' parameter allows to specify a comma separated list of
369 * keywords and device ranges. When the dasd driver is build into the kernel,
370 * the complete list will be stored as one element of the dasd[] array.
371 * When the dasd driver is build as a module, then the list is broken into
372 * it's elements and each dasd[] entry contains one element.
373 */
374 int
375 dasd_parse(void)
376 {
377 int rc, i;
378 char *parsestring;
379
380 rc = 0;
381 for (i = 0; i < 256; i++) {
382 if (dasd[i] == NULL)
383 break;
384 parsestring = dasd[i];
385 /* loop over the comma separated list in the parsestring */
386 while (*parsestring) {
387 parsestring = dasd_parse_next_element(parsestring);
388 if(IS_ERR(parsestring)) {
389 rc = PTR_ERR(parsestring);
390 break;
391 }
392 }
393 if (rc) {
394 DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
395 break;
396 }
397 }
398 return rc;
399 }
400
401 /*
402 * Add a devmap for the device specified by busid. It is possible that
403 * the devmap already exists (dasd= parameter). The order of the devices
404 * added through this function will define the kdevs for the individual
405 * devices.
406 */
407 static struct dasd_devmap *
408 dasd_add_busid(const char *bus_id, int features)
409 {
410 struct dasd_devmap *devmap, *new, *tmp;
411 int hash;
412
413 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
414 if (!new)
415 return ERR_PTR(-ENOMEM);
416 spin_lock(&dasd_devmap_lock);
417 devmap = NULL;
418 hash = dasd_hash_busid(bus_id);
419 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
420 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
421 devmap = tmp;
422 break;
423 }
424 if (!devmap) {
425 /* This bus_id is new. */
426 new->devindex = dasd_max_devindex++;
427 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
428 new->features = features;
429 new->device = NULL;
430 list_add(&new->list, &dasd_hashlists[hash]);
431 devmap = new;
432 new = NULL;
433 }
434 spin_unlock(&dasd_devmap_lock);
435 kfree(new);
436 return devmap;
437 }
438
439 /*
440 * Find devmap for device with given bus_id.
441 */
442 static struct dasd_devmap *
443 dasd_find_busid(const char *bus_id)
444 {
445 struct dasd_devmap *devmap, *tmp;
446 int hash;
447
448 spin_lock(&dasd_devmap_lock);
449 devmap = ERR_PTR(-ENODEV);
450 hash = dasd_hash_busid(bus_id);
451 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
452 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
453 devmap = tmp;
454 break;
455 }
456 }
457 spin_unlock(&dasd_devmap_lock);
458 return devmap;
459 }
460
461 /*
462 * Check if busid has been added to the list of dasd ranges.
463 */
464 int
465 dasd_busid_known(const char *bus_id)
466 {
467 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
468 }
469
470 /*
471 * Forget all about the device numbers added so far.
472 * This may only be called at module unload or system shutdown.
473 */
474 static void
475 dasd_forget_ranges(void)
476 {
477 struct dasd_devmap *devmap, *n;
478 int i;
479
480 spin_lock(&dasd_devmap_lock);
481 for (i = 0; i < 256; i++) {
482 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
483 BUG_ON(devmap->device != NULL);
484 list_del(&devmap->list);
485 kfree(devmap);
486 }
487 }
488 spin_unlock(&dasd_devmap_lock);
489 }
490
491 /*
492 * Find the device struct by its device index.
493 */
494 struct dasd_device *
495 dasd_device_from_devindex(int devindex)
496 {
497 struct dasd_devmap *devmap, *tmp;
498 struct dasd_device *device;
499 int i;
500
501 spin_lock(&dasd_devmap_lock);
502 devmap = NULL;
503 for (i = 0; (i < 256) && !devmap; i++)
504 list_for_each_entry(tmp, &dasd_hashlists[i], list)
505 if (tmp->devindex == devindex) {
506 /* Found the devmap for the device. */
507 devmap = tmp;
508 break;
509 }
510 if (devmap && devmap->device) {
511 device = devmap->device;
512 dasd_get_device(device);
513 } else
514 device = ERR_PTR(-ENODEV);
515 spin_unlock(&dasd_devmap_lock);
516 return device;
517 }
518
519 /*
520 * Return devmap for cdev. If no devmap exists yet, create one and
521 * connect it to the cdev.
522 */
523 static struct dasd_devmap *
524 dasd_devmap_from_cdev(struct ccw_device *cdev)
525 {
526 struct dasd_devmap *devmap;
527
528 devmap = dasd_find_busid(dev_name(&cdev->dev));
529 if (IS_ERR(devmap))
530 devmap = dasd_add_busid(dev_name(&cdev->dev),
531 DASD_FEATURE_DEFAULT);
532 return devmap;
533 }
534
535 /*
536 * Create a dasd device structure for cdev.
537 */
538 struct dasd_device *
539 dasd_create_device(struct ccw_device *cdev)
540 {
541 struct dasd_devmap *devmap;
542 struct dasd_device *device;
543 unsigned long flags;
544 int rc;
545
546 devmap = dasd_devmap_from_cdev(cdev);
547 if (IS_ERR(devmap))
548 return (void *) devmap;
549
550 device = dasd_alloc_device();
551 if (IS_ERR(device))
552 return device;
553 atomic_set(&device->ref_count, 3);
554
555 spin_lock(&dasd_devmap_lock);
556 if (!devmap->device) {
557 devmap->device = device;
558 device->devindex = devmap->devindex;
559 device->features = devmap->features;
560 get_device(&cdev->dev);
561 device->cdev = cdev;
562 rc = 0;
563 } else
564 /* Someone else was faster. */
565 rc = -EBUSY;
566 spin_unlock(&dasd_devmap_lock);
567
568 if (rc) {
569 dasd_free_device(device);
570 return ERR_PTR(rc);
571 }
572
573 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
574 dev_set_drvdata(&cdev->dev, device);
575 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
576
577 return device;
578 }
579
580 /*
581 * Wait queue for dasd_delete_device waits.
582 */
583 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
584
585 /*
586 * Remove a dasd device structure. The passed referenced
587 * is destroyed.
588 */
589 void
590 dasd_delete_device(struct dasd_device *device)
591 {
592 struct ccw_device *cdev;
593 struct dasd_devmap *devmap;
594 unsigned long flags;
595
596 /* First remove device pointer from devmap. */
597 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
598 BUG_ON(IS_ERR(devmap));
599 spin_lock(&dasd_devmap_lock);
600 if (devmap->device != device) {
601 spin_unlock(&dasd_devmap_lock);
602 dasd_put_device(device);
603 return;
604 }
605 devmap->device = NULL;
606 spin_unlock(&dasd_devmap_lock);
607
608 /* Disconnect dasd_device structure from ccw_device structure. */
609 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
610 dev_set_drvdata(&device->cdev->dev, NULL);
611 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
612
613 /*
614 * Drop ref_count by 3, one for the devmap reference, one for
615 * the cdev reference and one for the passed reference.
616 */
617 atomic_sub(3, &device->ref_count);
618
619 /* Wait for reference counter to drop to zero. */
620 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
621
622 /* Disconnect dasd_device structure from ccw_device structure. */
623 cdev = device->cdev;
624 device->cdev = NULL;
625
626 /* Put ccw_device structure. */
627 put_device(&cdev->dev);
628
629 /* Now the device structure can be freed. */
630 dasd_free_device(device);
631 }
632
633 /*
634 * Reference counter dropped to zero. Wake up waiter
635 * in dasd_delete_device.
636 */
637 void
638 dasd_put_device_wake(struct dasd_device *device)
639 {
640 wake_up(&dasd_delete_wq);
641 }
642 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
643
644 /*
645 * Return dasd_device structure associated with cdev.
646 * This function needs to be called with the ccw device
647 * lock held. It can be used from interrupt context.
648 */
649 struct dasd_device *
650 dasd_device_from_cdev_locked(struct ccw_device *cdev)
651 {
652 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
653
654 if (!device)
655 return ERR_PTR(-ENODEV);
656 dasd_get_device(device);
657 return device;
658 }
659
660 /*
661 * Return dasd_device structure associated with cdev.
662 */
663 struct dasd_device *
664 dasd_device_from_cdev(struct ccw_device *cdev)
665 {
666 struct dasd_device *device;
667 unsigned long flags;
668
669 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
670 device = dasd_device_from_cdev_locked(cdev);
671 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
672 return device;
673 }
674
675 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
676 {
677 struct dasd_devmap *devmap;
678
679 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
680 if (IS_ERR(devmap))
681 return;
682 spin_lock(&dasd_devmap_lock);
683 gdp->private_data = devmap;
684 spin_unlock(&dasd_devmap_lock);
685 }
686
687 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
688 {
689 struct dasd_device *device;
690 struct dasd_devmap *devmap;
691
692 if (!gdp->private_data)
693 return NULL;
694 device = NULL;
695 spin_lock(&dasd_devmap_lock);
696 devmap = gdp->private_data;
697 if (devmap && devmap->device) {
698 device = devmap->device;
699 dasd_get_device(device);
700 }
701 spin_unlock(&dasd_devmap_lock);
702 return device;
703 }
704
705 /*
706 * SECTION: files in sysfs
707 */
708
709 /*
710 * failfast controls the behaviour, if no path is available
711 */
712 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
713 char *buf)
714 {
715 struct dasd_devmap *devmap;
716 int ff_flag;
717
718 devmap = dasd_find_busid(dev_name(dev));
719 if (!IS_ERR(devmap))
720 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
721 else
722 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
723 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
724 }
725
726 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
727 const char *buf, size_t count)
728 {
729 struct dasd_devmap *devmap;
730 int val;
731 char *endp;
732
733 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
734 if (IS_ERR(devmap))
735 return PTR_ERR(devmap);
736
737 val = simple_strtoul(buf, &endp, 0);
738 if (((endp + 1) < (buf + count)) || (val > 1))
739 return -EINVAL;
740
741 spin_lock(&dasd_devmap_lock);
742 if (val)
743 devmap->features |= DASD_FEATURE_FAILFAST;
744 else
745 devmap->features &= ~DASD_FEATURE_FAILFAST;
746 if (devmap->device)
747 devmap->device->features = devmap->features;
748 spin_unlock(&dasd_devmap_lock);
749 return count;
750 }
751
752 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
753
754 /*
755 * readonly controls the readonly status of a dasd
756 */
757 static ssize_t
758 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
759 {
760 struct dasd_devmap *devmap;
761 int ro_flag;
762
763 devmap = dasd_find_busid(dev_name(dev));
764 if (!IS_ERR(devmap))
765 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
766 else
767 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
768 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
769 }
770
771 static ssize_t
772 dasd_ro_store(struct device *dev, struct device_attribute *attr,
773 const char *buf, size_t count)
774 {
775 struct dasd_devmap *devmap;
776 struct dasd_device *device;
777 int val;
778 char *endp;
779
780 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
781 if (IS_ERR(devmap))
782 return PTR_ERR(devmap);
783
784 val = simple_strtoul(buf, &endp, 0);
785 if (((endp + 1) < (buf + count)) || (val > 1))
786 return -EINVAL;
787
788 spin_lock(&dasd_devmap_lock);
789 if (val)
790 devmap->features |= DASD_FEATURE_READONLY;
791 else
792 devmap->features &= ~DASD_FEATURE_READONLY;
793 device = devmap->device;
794 if (device) {
795 device->features = devmap->features;
796 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
797 }
798 spin_unlock(&dasd_devmap_lock);
799 if (device && device->block && device->block->gdp)
800 set_disk_ro(device->block->gdp, val);
801 return count;
802 }
803
804 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
805 /*
806 * erplog controls the logging of ERP related data
807 * (e.g. failing channel programs).
808 */
809 static ssize_t
810 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
811 {
812 struct dasd_devmap *devmap;
813 int erplog;
814
815 devmap = dasd_find_busid(dev_name(dev));
816 if (!IS_ERR(devmap))
817 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
818 else
819 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
820 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
821 }
822
823 static ssize_t
824 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
825 const char *buf, size_t count)
826 {
827 struct dasd_devmap *devmap;
828 int val;
829 char *endp;
830
831 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
832 if (IS_ERR(devmap))
833 return PTR_ERR(devmap);
834
835 val = simple_strtoul(buf, &endp, 0);
836 if (((endp + 1) < (buf + count)) || (val > 1))
837 return -EINVAL;
838
839 spin_lock(&dasd_devmap_lock);
840 if (val)
841 devmap->features |= DASD_FEATURE_ERPLOG;
842 else
843 devmap->features &= ~DASD_FEATURE_ERPLOG;
844 if (devmap->device)
845 devmap->device->features = devmap->features;
846 spin_unlock(&dasd_devmap_lock);
847 return count;
848 }
849
850 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
851
852 /*
853 * use_diag controls whether the driver should use diag rather than ssch
854 * to talk to the device
855 */
856 static ssize_t
857 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
858 {
859 struct dasd_devmap *devmap;
860 int use_diag;
861
862 devmap = dasd_find_busid(dev_name(dev));
863 if (!IS_ERR(devmap))
864 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
865 else
866 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
867 return sprintf(buf, use_diag ? "1\n" : "0\n");
868 }
869
870 static ssize_t
871 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
872 const char *buf, size_t count)
873 {
874 struct dasd_devmap *devmap;
875 ssize_t rc;
876 int val;
877 char *endp;
878
879 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
880 if (IS_ERR(devmap))
881 return PTR_ERR(devmap);
882
883 val = simple_strtoul(buf, &endp, 0);
884 if (((endp + 1) < (buf + count)) || (val > 1))
885 return -EINVAL;
886
887 spin_lock(&dasd_devmap_lock);
888 /* Changing diag discipline flag is only allowed in offline state. */
889 rc = count;
890 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
891 if (val)
892 devmap->features |= DASD_FEATURE_USEDIAG;
893 else
894 devmap->features &= ~DASD_FEATURE_USEDIAG;
895 } else
896 rc = -EPERM;
897 spin_unlock(&dasd_devmap_lock);
898 return rc;
899 }
900
901 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
902
903 /*
904 * use_raw controls whether the driver should give access to raw eckd data or
905 * operate in standard mode
906 */
907 static ssize_t
908 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
909 {
910 struct dasd_devmap *devmap;
911 int use_raw;
912
913 devmap = dasd_find_busid(dev_name(dev));
914 if (!IS_ERR(devmap))
915 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
916 else
917 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
918 return sprintf(buf, use_raw ? "1\n" : "0\n");
919 }
920
921 static ssize_t
922 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
923 const char *buf, size_t count)
924 {
925 struct dasd_devmap *devmap;
926 ssize_t rc;
927 unsigned long val;
928
929 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
930 if (IS_ERR(devmap))
931 return PTR_ERR(devmap);
932
933 if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
934 return -EINVAL;
935
936 spin_lock(&dasd_devmap_lock);
937 /* Changing diag discipline flag is only allowed in offline state. */
938 rc = count;
939 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
940 if (val)
941 devmap->features |= DASD_FEATURE_USERAW;
942 else
943 devmap->features &= ~DASD_FEATURE_USERAW;
944 } else
945 rc = -EPERM;
946 spin_unlock(&dasd_devmap_lock);
947 return rc;
948 }
949
950 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
951 dasd_use_raw_store);
952
953 static ssize_t
954 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
955 const char *buf, size_t count)
956 {
957 struct ccw_device *cdev = to_ccwdev(dev);
958 struct dasd_device *device;
959 int rc;
960
961 device = dasd_device_from_cdev(cdev);
962 if (IS_ERR(device)) {
963 rc = PTR_ERR(device);
964 goto out;
965 }
966
967 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
968 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
969 /* Already doing offline processing */
970 dasd_put_device(device);
971 rc = -EBUSY;
972 goto out;
973 }
974
975 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
976 dasd_put_device(device);
977
978 rc = ccw_device_set_offline(cdev);
979
980 out:
981 return rc ? rc : count;
982 }
983
984 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
985
986 static ssize_t
987 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
988 char *buf)
989 {
990 struct dasd_device *device;
991 ssize_t len;
992
993 device = dasd_device_from_cdev(to_ccwdev(dev));
994 if (IS_ERR(device))
995 goto out;
996 else if (!device->discipline) {
997 dasd_put_device(device);
998 goto out;
999 } else {
1000 len = snprintf(buf, PAGE_SIZE, "%s\n",
1001 device->discipline->name);
1002 dasd_put_device(device);
1003 return len;
1004 }
1005 out:
1006 len = snprintf(buf, PAGE_SIZE, "none\n");
1007 return len;
1008 }
1009
1010 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1011
1012 static ssize_t
1013 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1014 char *buf)
1015 {
1016 struct dasd_device *device;
1017 ssize_t len;
1018
1019 device = dasd_device_from_cdev(to_ccwdev(dev));
1020 if (!IS_ERR(device)) {
1021 switch (device->state) {
1022 case DASD_STATE_NEW:
1023 len = snprintf(buf, PAGE_SIZE, "new\n");
1024 break;
1025 case DASD_STATE_KNOWN:
1026 len = snprintf(buf, PAGE_SIZE, "detected\n");
1027 break;
1028 case DASD_STATE_BASIC:
1029 len = snprintf(buf, PAGE_SIZE, "basic\n");
1030 break;
1031 case DASD_STATE_UNFMT:
1032 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1033 break;
1034 case DASD_STATE_READY:
1035 len = snprintf(buf, PAGE_SIZE, "ready\n");
1036 break;
1037 case DASD_STATE_ONLINE:
1038 len = snprintf(buf, PAGE_SIZE, "online\n");
1039 break;
1040 default:
1041 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1042 break;
1043 }
1044 dasd_put_device(device);
1045 } else
1046 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1047 return len;
1048 }
1049
1050 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1051
1052 static ssize_t dasd_alias_show(struct device *dev,
1053 struct device_attribute *attr, char *buf)
1054 {
1055 struct dasd_device *device;
1056 struct dasd_uid uid;
1057
1058 device = dasd_device_from_cdev(to_ccwdev(dev));
1059 if (IS_ERR(device))
1060 return sprintf(buf, "0\n");
1061
1062 if (device->discipline && device->discipline->get_uid &&
1063 !device->discipline->get_uid(device, &uid)) {
1064 if (uid.type == UA_BASE_PAV_ALIAS ||
1065 uid.type == UA_HYPER_PAV_ALIAS) {
1066 dasd_put_device(device);
1067 return sprintf(buf, "1\n");
1068 }
1069 }
1070 dasd_put_device(device);
1071
1072 return sprintf(buf, "0\n");
1073 }
1074
1075 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1076
1077 static ssize_t dasd_vendor_show(struct device *dev,
1078 struct device_attribute *attr, char *buf)
1079 {
1080 struct dasd_device *device;
1081 struct dasd_uid uid;
1082 char *vendor;
1083
1084 device = dasd_device_from_cdev(to_ccwdev(dev));
1085 vendor = "";
1086 if (IS_ERR(device))
1087 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1088
1089 if (device->discipline && device->discipline->get_uid &&
1090 !device->discipline->get_uid(device, &uid))
1091 vendor = uid.vendor;
1092
1093 dasd_put_device(device);
1094
1095 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1096 }
1097
1098 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1099
1100 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1101 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1102 /* vduit */ 32 + 1)
1103
1104 static ssize_t
1105 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1106 {
1107 struct dasd_device *device;
1108 struct dasd_uid uid;
1109 char uid_string[UID_STRLEN];
1110 char ua_string[3];
1111
1112 device = dasd_device_from_cdev(to_ccwdev(dev));
1113 uid_string[0] = 0;
1114 if (IS_ERR(device))
1115 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1116
1117 if (device->discipline && device->discipline->get_uid &&
1118 !device->discipline->get_uid(device, &uid)) {
1119 switch (uid.type) {
1120 case UA_BASE_DEVICE:
1121 snprintf(ua_string, sizeof(ua_string), "%02x",
1122 uid.real_unit_addr);
1123 break;
1124 case UA_BASE_PAV_ALIAS:
1125 snprintf(ua_string, sizeof(ua_string), "%02x",
1126 uid.base_unit_addr);
1127 break;
1128 case UA_HYPER_PAV_ALIAS:
1129 snprintf(ua_string, sizeof(ua_string), "xx");
1130 break;
1131 default:
1132 /* should not happen, treat like base device */
1133 snprintf(ua_string, sizeof(ua_string), "%02x",
1134 uid.real_unit_addr);
1135 break;
1136 }
1137
1138 if (strlen(uid.vduit) > 0)
1139 snprintf(uid_string, sizeof(uid_string),
1140 "%s.%s.%04x.%s.%s",
1141 uid.vendor, uid.serial, uid.ssid, ua_string,
1142 uid.vduit);
1143 else
1144 snprintf(uid_string, sizeof(uid_string),
1145 "%s.%s.%04x.%s",
1146 uid.vendor, uid.serial, uid.ssid, ua_string);
1147 }
1148 dasd_put_device(device);
1149
1150 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1151 }
1152 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1153
1154 /*
1155 * extended error-reporting
1156 */
1157 static ssize_t
1158 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1159 {
1160 struct dasd_devmap *devmap;
1161 int eer_flag;
1162
1163 devmap = dasd_find_busid(dev_name(dev));
1164 if (!IS_ERR(devmap) && devmap->device)
1165 eer_flag = dasd_eer_enabled(devmap->device);
1166 else
1167 eer_flag = 0;
1168 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1169 }
1170
1171 static ssize_t
1172 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1173 const char *buf, size_t count)
1174 {
1175 struct dasd_devmap *devmap;
1176 int val, rc;
1177 char *endp;
1178
1179 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1180 if (IS_ERR(devmap))
1181 return PTR_ERR(devmap);
1182 if (!devmap->device)
1183 return -ENODEV;
1184
1185 val = simple_strtoul(buf, &endp, 0);
1186 if (((endp + 1) < (buf + count)) || (val > 1))
1187 return -EINVAL;
1188
1189 if (val) {
1190 rc = dasd_eer_enable(devmap->device);
1191 if (rc)
1192 return rc;
1193 } else
1194 dasd_eer_disable(devmap->device);
1195 return count;
1196 }
1197
1198 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1199
1200 /*
1201 * expiration time for default requests
1202 */
1203 static ssize_t
1204 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1205 {
1206 struct dasd_device *device;
1207 int len;
1208
1209 device = dasd_device_from_cdev(to_ccwdev(dev));
1210 if (IS_ERR(device))
1211 return -ENODEV;
1212 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1213 dasd_put_device(device);
1214 return len;
1215 }
1216
1217 static ssize_t
1218 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1219 const char *buf, size_t count)
1220 {
1221 struct dasd_device *device;
1222 unsigned long val;
1223
1224 device = dasd_device_from_cdev(to_ccwdev(dev));
1225 if (IS_ERR(device))
1226 return -ENODEV;
1227
1228 if ((strict_strtoul(buf, 10, &val) != 0) ||
1229 (val > DASD_EXPIRES_MAX) || val == 0) {
1230 dasd_put_device(device);
1231 return -EINVAL;
1232 }
1233
1234 if (val)
1235 device->default_expires = val;
1236
1237 dasd_put_device(device);
1238 return count;
1239 }
1240
1241 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1242
1243 static ssize_t dasd_reservation_policy_show(struct device *dev,
1244 struct device_attribute *attr,
1245 char *buf)
1246 {
1247 struct dasd_devmap *devmap;
1248 int rc = 0;
1249
1250 devmap = dasd_find_busid(dev_name(dev));
1251 if (IS_ERR(devmap)) {
1252 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1253 } else {
1254 spin_lock(&dasd_devmap_lock);
1255 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1256 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1257 else
1258 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1259 spin_unlock(&dasd_devmap_lock);
1260 }
1261 return rc;
1262 }
1263
1264 static ssize_t dasd_reservation_policy_store(struct device *dev,
1265 struct device_attribute *attr,
1266 const char *buf, size_t count)
1267 {
1268 struct dasd_devmap *devmap;
1269 int rc;
1270
1271 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1272 if (IS_ERR(devmap))
1273 return PTR_ERR(devmap);
1274 rc = 0;
1275 spin_lock(&dasd_devmap_lock);
1276 if (sysfs_streq("ignore", buf))
1277 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1278 else if (sysfs_streq("fail", buf))
1279 devmap->features |= DASD_FEATURE_FAILONSLCK;
1280 else
1281 rc = -EINVAL;
1282 if (devmap->device)
1283 devmap->device->features = devmap->features;
1284 spin_unlock(&dasd_devmap_lock);
1285 if (rc)
1286 return rc;
1287 else
1288 return count;
1289 }
1290
1291 static DEVICE_ATTR(reservation_policy, 0644,
1292 dasd_reservation_policy_show, dasd_reservation_policy_store);
1293
1294 static ssize_t dasd_reservation_state_show(struct device *dev,
1295 struct device_attribute *attr,
1296 char *buf)
1297 {
1298 struct dasd_device *device;
1299 int rc = 0;
1300
1301 device = dasd_device_from_cdev(to_ccwdev(dev));
1302 if (IS_ERR(device))
1303 return snprintf(buf, PAGE_SIZE, "none\n");
1304
1305 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1306 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1307 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1308 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1309 else
1310 rc = snprintf(buf, PAGE_SIZE, "none\n");
1311 dasd_put_device(device);
1312 return rc;
1313 }
1314
1315 static ssize_t dasd_reservation_state_store(struct device *dev,
1316 struct device_attribute *attr,
1317 const char *buf, size_t count)
1318 {
1319 struct dasd_device *device;
1320 int rc = 0;
1321
1322 device = dasd_device_from_cdev(to_ccwdev(dev));
1323 if (IS_ERR(device))
1324 return -ENODEV;
1325 if (sysfs_streq("reset", buf))
1326 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1327 else
1328 rc = -EINVAL;
1329 dasd_put_device(device);
1330
1331 if (rc)
1332 return rc;
1333 else
1334 return count;
1335 }
1336
1337 static DEVICE_ATTR(last_known_reservation_state, 0644,
1338 dasd_reservation_state_show, dasd_reservation_state_store);
1339
1340 static struct attribute * dasd_attrs[] = {
1341 &dev_attr_readonly.attr,
1342 &dev_attr_discipline.attr,
1343 &dev_attr_status.attr,
1344 &dev_attr_alias.attr,
1345 &dev_attr_vendor.attr,
1346 &dev_attr_uid.attr,
1347 &dev_attr_use_diag.attr,
1348 &dev_attr_raw_track_access.attr,
1349 &dev_attr_eer_enabled.attr,
1350 &dev_attr_erplog.attr,
1351 &dev_attr_failfast.attr,
1352 &dev_attr_expires.attr,
1353 &dev_attr_reservation_policy.attr,
1354 &dev_attr_last_known_reservation_state.attr,
1355 &dev_attr_safe_offline.attr,
1356 NULL,
1357 };
1358
1359 static struct attribute_group dasd_attr_group = {
1360 .attrs = dasd_attrs,
1361 };
1362
1363 /*
1364 * Return value of the specified feature.
1365 */
1366 int
1367 dasd_get_feature(struct ccw_device *cdev, int feature)
1368 {
1369 struct dasd_devmap *devmap;
1370
1371 devmap = dasd_find_busid(dev_name(&cdev->dev));
1372 if (IS_ERR(devmap))
1373 return PTR_ERR(devmap);
1374
1375 return ((devmap->features & feature) != 0);
1376 }
1377
1378 /*
1379 * Set / reset given feature.
1380 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1381 */
1382 int
1383 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1384 {
1385 struct dasd_devmap *devmap;
1386
1387 devmap = dasd_find_busid(dev_name(&cdev->dev));
1388 if (IS_ERR(devmap))
1389 return PTR_ERR(devmap);
1390
1391 spin_lock(&dasd_devmap_lock);
1392 if (flag)
1393 devmap->features |= feature;
1394 else
1395 devmap->features &= ~feature;
1396 if (devmap->device)
1397 devmap->device->features = devmap->features;
1398 spin_unlock(&dasd_devmap_lock);
1399 return 0;
1400 }
1401
1402
1403 int
1404 dasd_add_sysfs_files(struct ccw_device *cdev)
1405 {
1406 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1407 }
1408
1409 void
1410 dasd_remove_sysfs_files(struct ccw_device *cdev)
1411 {
1412 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1413 }
1414
1415
1416 int
1417 dasd_devmap_init(void)
1418 {
1419 int i;
1420
1421 /* Initialize devmap structures. */
1422 dasd_max_devindex = 0;
1423 for (i = 0; i < 256; i++)
1424 INIT_LIST_HEAD(&dasd_hashlists[i]);
1425 return 0;
1426 }
1427
1428 void
1429 dasd_devmap_exit(void)
1430 {
1431 dasd_forget_ranges();
1432 }
Linus' kernel tree