Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6.git] / drivers / scsi / scsi_sysfs.c
1 /*
2  * scsi_sysfs.c
3  *
4  * SCSI sysfs interface routines.
5  *
6  * Created to pull SCSI mid layer sysfs routines into one file.
7  */
8
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/blkdev.h>
12 #include <linux/device.h>
13
14 #include <scsi/scsi.h>
15 #include <scsi/scsi_device.h>
16 #include <scsi/scsi_host.h>
17 #include <scsi/scsi_tcq.h>
18 #include <scsi/scsi_transport.h>
19 #include <scsi/scsi_driver.h>
20
21 #include "scsi_priv.h"
22 #include "scsi_logging.h"
23
24 static const struct {
25         enum scsi_device_state  value;
26         char                    *name;
27 } sdev_states[] = {
28         { SDEV_CREATED, "created" },
29         { SDEV_RUNNING, "running" },
30         { SDEV_CANCEL, "cancel" },
31         { SDEV_DEL, "deleted" },
32         { SDEV_QUIESCE, "quiesce" },
33         { SDEV_OFFLINE, "offline" },
34         { SDEV_BLOCK,   "blocked" },
35 };
36
37 const char *scsi_device_state_name(enum scsi_device_state state)
38 {
39         int i;
40         char *name = NULL;
41
42         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
43                 if (sdev_states[i].value == state) {
44                         name = sdev_states[i].name;
45                         break;
46                 }
47         }
48         return name;
49 }
50
51 static const struct {
52         enum scsi_host_state    value;
53         char                    *name;
54 } shost_states[] = {
55         { SHOST_CREATED, "created" },
56         { SHOST_RUNNING, "running" },
57         { SHOST_CANCEL, "cancel" },
58         { SHOST_DEL, "deleted" },
59         { SHOST_RECOVERY, "recovery" },
60         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
61         { SHOST_DEL_RECOVERY, "deleted/recovery", },
62 };
63 const char *scsi_host_state_name(enum scsi_host_state state)
64 {
65         int i;
66         char *name = NULL;
67
68         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
69                 if (shost_states[i].value == state) {
70                         name = shost_states[i].name;
71                         break;
72                 }
73         }
74         return name;
75 }
76
77 static int check_set(unsigned int *val, char *src)
78 {
79         char *last;
80
81         if (strncmp(src, "-", 20) == 0) {
82                 *val = SCAN_WILD_CARD;
83         } else {
84                 /*
85                  * Doesn't check for int overflow
86                  */
87                 *val = simple_strtoul(src, &last, 0);
88                 if (*last != '\0')
89                         return 1;
90         }
91         return 0;
92 }
93
94 static int scsi_scan(struct Scsi_Host *shost, const char *str)
95 {
96         char s1[15], s2[15], s3[15], junk;
97         unsigned int channel, id, lun;
98         int res;
99
100         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
101         if (res != 3)
102                 return -EINVAL;
103         if (check_set(&channel, s1))
104                 return -EINVAL;
105         if (check_set(&id, s2))
106                 return -EINVAL;
107         if (check_set(&lun, s3))
108                 return -EINVAL;
109         if (shost->transportt->user_scan)
110                 res = shost->transportt->user_scan(shost, channel, id, lun);
111         else
112                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
113         return res;
114 }
115
116 /*
117  * shost_show_function: macro to create an attr function that can be used to
118  * show a non-bit field.
119  */
120 #define shost_show_function(name, field, format_string)                 \
121 static ssize_t                                                          \
122 show_##name (struct class_device *class_dev, char *buf)                 \
123 {                                                                       \
124         struct Scsi_Host *shost = class_to_shost(class_dev);            \
125         return snprintf (buf, 20, format_string, shost->field);         \
126 }
127
128 /*
129  * shost_rd_attr: macro to create a function and attribute variable for a
130  * read only field.
131  */
132 #define shost_rd_attr2(name, field, format_string)                      \
133         shost_show_function(name, field, format_string)                 \
134 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
135
136 #define shost_rd_attr(field, format_string) \
137 shost_rd_attr2(field, field, format_string)
138
139 /*
140  * Create the actual show/store functions and data structures.
141  */
142
143 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
144                           size_t count)
145 {
146         struct Scsi_Host *shost = class_to_shost(class_dev);
147         int res;
148
149         res = scsi_scan(shost, buf);
150         if (res == 0)
151                 res = count;
152         return res;
153 };
154 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
155
156 static ssize_t
157 store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
158 {
159         int i;
160         struct Scsi_Host *shost = class_to_shost(class_dev);
161         enum scsi_host_state state = 0;
162
163         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
164                 const int len = strlen(shost_states[i].name);
165                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
166                    buf[len] == '\n') {
167                         state = shost_states[i].value;
168                         break;
169                 }
170         }
171         if (!state)
172                 return -EINVAL;
173
174         if (scsi_host_set_state(shost, state))
175                 return -EINVAL;
176         return count;
177 }
178
179 static ssize_t
180 show_shost_state(struct class_device *class_dev, char *buf)
181 {
182         struct Scsi_Host *shost = class_to_shost(class_dev);
183         const char *name = scsi_host_state_name(shost->shost_state);
184
185         if (!name)
186                 return -EINVAL;
187
188         return snprintf(buf, 20, "%s\n", name);
189 }
190
191 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
192
193 static ssize_t
194 show_shost_mode(unsigned int mode, char *buf)
195 {
196         ssize_t len = 0;
197
198         if (mode & MODE_INITIATOR)
199                 len = sprintf(buf, "%s", "Initiator");
200
201         if (mode & MODE_TARGET)
202                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
203
204         len += sprintf(buf + len, "\n");
205
206         return len;
207 }
208
209 static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)
210 {
211         struct Scsi_Host *shost = class_to_shost(class_dev);
212
213         if (shost->hostt->supported_mode == MODE_UNKNOWN)
214                 return snprintf(buf, 20, "unknown\n");
215         else
216                 return show_shost_mode(shost->hostt->supported_mode, buf);
217 }
218
219 static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
220
221 static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf)
222 {
223         struct Scsi_Host *shost = class_to_shost(class_dev);
224
225         if (shost->active_mode == MODE_UNKNOWN)
226                 return snprintf(buf, 20, "unknown\n");
227         else
228                 return show_shost_mode(shost->active_mode, buf);
229 }
230
231 static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
232
233 shost_rd_attr(unique_id, "%u\n");
234 shost_rd_attr(host_busy, "%hu\n");
235 shost_rd_attr(cmd_per_lun, "%hd\n");
236 shost_rd_attr(can_queue, "%hd\n");
237 shost_rd_attr(sg_tablesize, "%hu\n");
238 shost_rd_attr(unchecked_isa_dma, "%d\n");
239 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
240
241 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
242         &class_device_attr_unique_id,
243         &class_device_attr_host_busy,
244         &class_device_attr_cmd_per_lun,
245         &class_device_attr_can_queue,
246         &class_device_attr_sg_tablesize,
247         &class_device_attr_unchecked_isa_dma,
248         &class_device_attr_proc_name,
249         &class_device_attr_scan,
250         &class_device_attr_state,
251         &class_device_attr_supported_mode,
252         &class_device_attr_active_mode,
253         NULL
254 };
255
256 static void scsi_device_cls_release(struct class_device *class_dev)
257 {
258         struct scsi_device *sdev;
259
260         sdev = class_to_sdev(class_dev);
261         put_device(&sdev->sdev_gendev);
262 }
263
264 static void scsi_device_dev_release_usercontext(struct work_struct *work)
265 {
266         struct scsi_device *sdev;
267         struct device *parent;
268         struct scsi_target *starget;
269         unsigned long flags;
270
271         sdev = container_of(work, struct scsi_device, ew.work);
272
273         parent = sdev->sdev_gendev.parent;
274         starget = to_scsi_target(parent);
275
276         spin_lock_irqsave(sdev->host->host_lock, flags);
277         starget->reap_ref++;
278         list_del(&sdev->siblings);
279         list_del(&sdev->same_target_siblings);
280         list_del(&sdev->starved_entry);
281         spin_unlock_irqrestore(sdev->host->host_lock, flags);
282
283         if (sdev->request_queue) {
284                 sdev->request_queue->queuedata = NULL;
285                 /* user context needed to free queue */
286                 scsi_free_queue(sdev->request_queue);
287                 /* temporary expedient, try to catch use of queue lock
288                  * after free of sdev */
289                 sdev->request_queue = NULL;
290         }
291
292         scsi_target_reap(scsi_target(sdev));
293
294         kfree(sdev->inquiry);
295         kfree(sdev);
296
297         if (parent)
298                 put_device(parent);
299 }
300
301 static void scsi_device_dev_release(struct device *dev)
302 {
303         struct scsi_device *sdp = to_scsi_device(dev);
304         execute_in_process_context(scsi_device_dev_release_usercontext,
305                                    &sdp->ew);
306 }
307
308 static struct class sdev_class = {
309         .name           = "scsi_device",
310         .release        = scsi_device_cls_release,
311 };
312
313 /* all probing is done in the individual ->probe routines */
314 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
315 {
316         struct scsi_device *sdp = to_scsi_device(dev);
317         if (sdp->no_uld_attach)
318                 return 0;
319         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
320 }
321
322 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
323 {
324         struct scsi_device *sdev = to_scsi_device(dev);
325
326         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
327         return 0;
328 }
329
330 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
331 {
332         struct device_driver *drv = dev->driver;
333         struct scsi_device *sdev = to_scsi_device(dev);
334         int err;
335
336         err = scsi_device_quiesce(sdev);
337         if (err)
338                 return err;
339
340         if (drv && drv->suspend) {
341                 err = drv->suspend(dev, state);
342                 if (err)
343                         return err;
344         }
345
346         return 0;
347 }
348
349 static int scsi_bus_resume(struct device * dev)
350 {
351         struct device_driver *drv = dev->driver;
352         struct scsi_device *sdev = to_scsi_device(dev);
353         int err = 0;
354
355         if (drv && drv->resume)
356                 err = drv->resume(dev);
357
358         scsi_device_resume(sdev);
359
360         return err;
361 }
362
363 struct bus_type scsi_bus_type = {
364         .name           = "scsi",
365         .match          = scsi_bus_match,
366         .uevent         = scsi_bus_uevent,
367         .suspend        = scsi_bus_suspend,
368         .resume         = scsi_bus_resume,
369 };
370
371 int scsi_sysfs_register(void)
372 {
373         int error;
374
375         error = bus_register(&scsi_bus_type);
376         if (!error) {
377                 error = class_register(&sdev_class);
378                 if (error)
379                         bus_unregister(&scsi_bus_type);
380         }
381
382         return error;
383 }
384
385 void scsi_sysfs_unregister(void)
386 {
387         class_unregister(&sdev_class);
388         bus_unregister(&scsi_bus_type);
389 }
390
391 /*
392  * sdev_show_function: macro to create an attr function that can be used to
393  * show a non-bit field.
394  */
395 #define sdev_show_function(field, format_string)                                \
396 static ssize_t                                                          \
397 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
398 {                                                                       \
399         struct scsi_device *sdev;                                       \
400         sdev = to_scsi_device(dev);                                     \
401         return snprintf (buf, 20, format_string, sdev->field);          \
402 }                                                                       \
403
404 /*
405  * sdev_rd_attr: macro to create a function and attribute variable for a
406  * read only field.
407  */
408 #define sdev_rd_attr(field, format_string)                              \
409         sdev_show_function(field, format_string)                        \
410 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
411
412
413 /*
414  * sdev_rd_attr: create a function and attribute variable for a
415  * read/write field.
416  */
417 #define sdev_rw_attr(field, format_string)                              \
418         sdev_show_function(field, format_string)                                \
419                                                                         \
420 static ssize_t                                                          \
421 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
422 {                                                                       \
423         struct scsi_device *sdev;                                       \
424         sdev = to_scsi_device(dev);                                     \
425         snscanf (buf, 20, format_string, &sdev->field);                 \
426         return count;                                                   \
427 }                                                                       \
428 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
429
430 /* Currently we don't export bit fields, but we might in future,
431  * so leave this code in */
432 #if 0
433 /*
434  * sdev_rd_attr: create a function and attribute variable for a
435  * read/write bit field.
436  */
437 #define sdev_rw_attr_bit(field)                                         \
438         sdev_show_function(field, "%d\n")                                       \
439                                                                         \
440 static ssize_t                                                          \
441 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
442 {                                                                       \
443         int ret;                                                        \
444         struct scsi_device *sdev;                                       \
445         ret = scsi_sdev_check_buf_bit(buf);                             \
446         if (ret >= 0)   {                                               \
447                 sdev = to_scsi_device(dev);                             \
448                 sdev->field = ret;                                      \
449                 ret = count;                                            \
450         }                                                               \
451         return ret;                                                     \
452 }                                                                       \
453 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
454
455 /*
456  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
457  * else return -EINVAL.
458  */
459 static int scsi_sdev_check_buf_bit(const char *buf)
460 {
461         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
462                 if (buf[0] == '1')
463                         return 1;
464                 else if (buf[0] == '0')
465                         return 0;
466                 else 
467                         return -EINVAL;
468         } else
469                 return -EINVAL;
470 }
471 #endif
472 /*
473  * Create the actual show/store functions and data structures.
474  */
475 sdev_rd_attr (device_blocked, "%d\n");
476 sdev_rd_attr (queue_depth, "%d\n");
477 sdev_rd_attr (type, "%d\n");
478 sdev_rd_attr (scsi_level, "%d\n");
479 sdev_rd_attr (vendor, "%.8s\n");
480 sdev_rd_attr (model, "%.16s\n");
481 sdev_rd_attr (rev, "%.4s\n");
482
483 static ssize_t
484 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
485 {
486         struct scsi_device *sdev;
487         sdev = to_scsi_device(dev);
488         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
489 }
490
491 static ssize_t
492 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
493 {
494         struct scsi_device *sdev;
495         int timeout;
496         sdev = to_scsi_device(dev);
497         sscanf (buf, "%d\n", &timeout);
498         sdev->timeout = timeout * HZ;
499         return count;
500 }
501 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
502
503 static ssize_t
504 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
505 {
506         scsi_rescan_device(dev);
507         return count;
508 }
509 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
510
511 static void sdev_store_delete_callback(struct device *dev)
512 {
513         scsi_remove_device(to_scsi_device(dev));
514 }
515
516 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
517                                  size_t count)
518 {
519         int rc;
520
521         /* An attribute cannot be unregistered by one of its own methods,
522          * so we have to use this roundabout approach.
523          */
524         rc = device_schedule_callback(dev, sdev_store_delete_callback);
525         if (rc)
526                 count = rc;
527         return count;
528 };
529 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
530
531 static ssize_t
532 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
533 {
534         int i;
535         struct scsi_device *sdev = to_scsi_device(dev);
536         enum scsi_device_state state = 0;
537
538         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
539                 const int len = strlen(sdev_states[i].name);
540                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
541                    buf[len] == '\n') {
542                         state = sdev_states[i].value;
543                         break;
544                 }
545         }
546         if (!state)
547                 return -EINVAL;
548
549         if (scsi_device_set_state(sdev, state))
550                 return -EINVAL;
551         return count;
552 }
553
554 static ssize_t
555 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
556 {
557         struct scsi_device *sdev = to_scsi_device(dev);
558         const char *name = scsi_device_state_name(sdev->sdev_state);
559
560         if (!name)
561                 return -EINVAL;
562
563         return snprintf(buf, 20, "%s\n", name);
564 }
565
566 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
567
568 static ssize_t
569 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
570 {
571         struct scsi_device *sdev = to_scsi_device(dev);
572         const char *name = "none";
573
574         if (sdev->ordered_tags)
575                 name = "ordered";
576         else if (sdev->simple_tags)
577                 name = "simple";
578
579         return snprintf(buf, 20, "%s\n", name);
580 }
581
582 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
583
584 static ssize_t
585 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
586 {
587         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
588 }
589
590 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
591
592 #define show_sdev_iostat(field)                                         \
593 static ssize_t                                                          \
594 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
595 {                                                                       \
596         struct scsi_device *sdev = to_scsi_device(dev);                 \
597         unsigned long long count = atomic_read(&sdev->field);           \
598         return snprintf(buf, 20, "0x%llx\n", count);                    \
599 }                                                                       \
600 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
601
602 show_sdev_iostat(iorequest_cnt);
603 show_sdev_iostat(iodone_cnt);
604 show_sdev_iostat(ioerr_cnt);
605
606 static ssize_t
607 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
608 {
609         struct scsi_device *sdev;
610         sdev = to_scsi_device(dev);
611         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
612 }
613 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
614
615 /* Default template for device attributes.  May NOT be modified */
616 static struct attribute *scsi_sdev_attrs[] = {
617         &dev_attr_device_blocked.attr,
618         &dev_attr_type.attr,
619         &dev_attr_scsi_level.attr,
620         &dev_attr_vendor.attr,
621         &dev_attr_model.attr,
622         &dev_attr_rev.attr,
623         &dev_attr_rescan.attr,
624         &dev_attr_delete.attr,
625         &dev_attr_state.attr,
626         &dev_attr_timeout.attr,
627         &dev_attr_iocounterbits.attr,
628         &dev_attr_iorequest_cnt.attr,
629         &dev_attr_iodone_cnt.attr,
630         &dev_attr_ioerr_cnt.attr,
631         &dev_attr_modalias.attr,
632         NULL
633 };
634
635 static struct attribute_group scsi_sdev_attr_group = {
636         .attrs =        scsi_sdev_attrs,
637 };
638
639 static struct attribute_group *scsi_sdev_attr_groups[] = {
640         &scsi_sdev_attr_group,
641         NULL
642 };
643
644 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
645                                          size_t count)
646 {
647         int depth, retval;
648         struct scsi_device *sdev = to_scsi_device(dev);
649         struct scsi_host_template *sht = sdev->host->hostt;
650
651         if (!sht->change_queue_depth)
652                 return -EINVAL;
653
654         depth = simple_strtoul(buf, NULL, 0);
655
656         if (depth < 1)
657                 return -EINVAL;
658
659         retval = sht->change_queue_depth(sdev, depth);
660         if (retval < 0)
661                 return retval;
662
663         return count;
664 }
665
666 static struct device_attribute sdev_attr_queue_depth_rw =
667         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
668                sdev_store_queue_depth_rw);
669
670 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
671                                         size_t count)
672 {
673         struct scsi_device *sdev = to_scsi_device(dev);
674         struct scsi_host_template *sht = sdev->host->hostt;
675         int tag_type = 0, retval;
676         int prev_tag_type = scsi_get_tag_type(sdev);
677
678         if (!sdev->tagged_supported || !sht->change_queue_type)
679                 return -EINVAL;
680
681         if (strncmp(buf, "ordered", 7) == 0)
682                 tag_type = MSG_ORDERED_TAG;
683         else if (strncmp(buf, "simple", 6) == 0)
684                 tag_type = MSG_SIMPLE_TAG;
685         else if (strncmp(buf, "none", 4) != 0)
686                 return -EINVAL;
687
688         if (tag_type == prev_tag_type)
689                 return count;
690
691         retval = sht->change_queue_type(sdev, tag_type);
692         if (retval < 0)
693                 return retval;
694
695         return count;
696 }
697
698 static struct device_attribute sdev_attr_queue_type_rw =
699         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
700                sdev_store_queue_type_rw);
701
702 /**
703  * scsi_sysfs_add_sdev - add scsi device to sysfs
704  * @sdev:       scsi_device to add
705  *
706  * Return value:
707  *      0 on Success / non-zero on Failure
708  **/
709 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
710 {
711         int error, i;
712         struct request_queue *rq = sdev->request_queue;
713
714         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
715                 return error;
716
717         error = device_add(&sdev->sdev_gendev);
718         if (error) {
719                 put_device(sdev->sdev_gendev.parent);
720                 printk(KERN_INFO "error 1\n");
721                 return error;
722         }
723         error = class_device_add(&sdev->sdev_classdev);
724         if (error) {
725                 printk(KERN_INFO "error 2\n");
726                 goto clean_device;
727         }
728
729         /* take a reference for the sdev_classdev; this is
730          * released by the sdev_class .release */
731         get_device(&sdev->sdev_gendev);
732
733         /* create queue files, which may be writable, depending on the host */
734         if (sdev->host->hostt->change_queue_depth)
735                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
736         else
737                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
738         if (error) {
739                 __scsi_remove_device(sdev);
740                 goto out;
741         }
742         if (sdev->host->hostt->change_queue_type)
743                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
744         else
745                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
746         if (error) {
747                 __scsi_remove_device(sdev);
748                 goto out;
749         }
750
751         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
752
753         if (error)
754                 sdev_printk(KERN_INFO, sdev,
755                             "Failed to register bsg queue, errno=%d\n", error);
756
757         /* we're treating error on bsg register as non-fatal, so pretend
758          * nothing went wrong */
759         error = 0;
760
761         /* add additional host specific attributes */
762         if (sdev->host->hostt->sdev_attrs) {
763                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
764                         error = device_create_file(&sdev->sdev_gendev,
765                                         sdev->host->hostt->sdev_attrs[i]);
766                         if (error) {
767                                 __scsi_remove_device(sdev);
768                                 goto out;
769                         }
770                 }
771         }
772
773         transport_add_device(&sdev->sdev_gendev);
774  out:
775         return error;
776
777  clean_device:
778         scsi_device_set_state(sdev, SDEV_CANCEL);
779
780         device_del(&sdev->sdev_gendev);
781         transport_destroy_device(&sdev->sdev_gendev);
782         put_device(&sdev->sdev_gendev);
783
784         return error;
785 }
786
787 void __scsi_remove_device(struct scsi_device *sdev)
788 {
789         struct device *dev = &sdev->sdev_gendev;
790
791         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
792                 return;
793
794         bsg_unregister_queue(sdev->request_queue);
795         class_device_unregister(&sdev->sdev_classdev);
796         transport_remove_device(dev);
797         device_del(dev);
798         scsi_device_set_state(sdev, SDEV_DEL);
799         if (sdev->host->hostt->slave_destroy)
800                 sdev->host->hostt->slave_destroy(sdev);
801         transport_destroy_device(dev);
802         put_device(dev);
803 }
804
805 /**
806  * scsi_remove_device - unregister a device from the scsi bus
807  * @sdev:       scsi_device to unregister
808  **/
809 void scsi_remove_device(struct scsi_device *sdev)
810 {
811         struct Scsi_Host *shost = sdev->host;
812
813         mutex_lock(&shost->scan_mutex);
814         __scsi_remove_device(sdev);
815         mutex_unlock(&shost->scan_mutex);
816 }
817 EXPORT_SYMBOL(scsi_remove_device);
818
819 static void __scsi_remove_target(struct scsi_target *starget)
820 {
821         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
822         unsigned long flags;
823         struct scsi_device *sdev;
824
825         spin_lock_irqsave(shost->host_lock, flags);
826         starget->reap_ref++;
827  restart:
828         list_for_each_entry(sdev, &shost->__devices, siblings) {
829                 if (sdev->channel != starget->channel ||
830                     sdev->id != starget->id ||
831                     sdev->sdev_state == SDEV_DEL)
832                         continue;
833                 spin_unlock_irqrestore(shost->host_lock, flags);
834                 scsi_remove_device(sdev);
835                 spin_lock_irqsave(shost->host_lock, flags);
836                 goto restart;
837         }
838         spin_unlock_irqrestore(shost->host_lock, flags);
839         scsi_target_reap(starget);
840 }
841
842 static int __remove_child (struct device * dev, void * data)
843 {
844         if (scsi_is_target_device(dev))
845                 __scsi_remove_target(to_scsi_target(dev));
846         return 0;
847 }
848
849 /**
850  * scsi_remove_target - try to remove a target and all its devices
851  * @dev: generic starget or parent of generic stargets to be removed
852  *
853  * Note: This is slightly racy.  It is possible that if the user
854  * requests the addition of another device then the target won't be
855  * removed.
856  */
857 void scsi_remove_target(struct device *dev)
858 {
859         struct device *rdev;
860
861         if (scsi_is_target_device(dev)) {
862                 __scsi_remove_target(to_scsi_target(dev));
863                 return;
864         }
865
866         rdev = get_device(dev);
867         device_for_each_child(dev, NULL, __remove_child);
868         put_device(rdev);
869 }
870 EXPORT_SYMBOL(scsi_remove_target);
871
872 int scsi_register_driver(struct device_driver *drv)
873 {
874         drv->bus = &scsi_bus_type;
875
876         return driver_register(drv);
877 }
878 EXPORT_SYMBOL(scsi_register_driver);
879
880 int scsi_register_interface(struct class_interface *intf)
881 {
882         intf->class = &sdev_class;
883
884         return class_interface_register(intf);
885 }
886 EXPORT_SYMBOL(scsi_register_interface);
887
888
889 static struct class_device_attribute *class_attr_overridden(
890                 struct class_device_attribute **attrs,
891                 struct class_device_attribute *attr)
892 {
893         int i;
894
895         if (!attrs)
896                 return NULL;
897         for (i = 0; attrs[i]; i++)
898                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
899                         return attrs[i];
900         return NULL;
901 }
902
903 static int class_attr_add(struct class_device *classdev,
904                 struct class_device_attribute *attr)
905 {
906         struct class_device_attribute *base_attr;
907
908         /*
909          * Spare the caller from having to copy things it's not interested in.
910          */
911         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
912         if (base_attr) {
913                 /* extend permissions */
914                 attr->attr.mode |= base_attr->attr.mode;
915
916                 /* override null show/store with default */
917                 if (!attr->show)
918                         attr->show = base_attr->show;
919                 if (!attr->store)
920                         attr->store = base_attr->store;
921         }
922
923         return class_device_create_file(classdev, attr);
924 }
925
926 /**
927  * scsi_sysfs_add_host - add scsi host to subsystem
928  * @shost:     scsi host struct to add to subsystem
929  * @dev:       parent struct device pointer
930  **/
931 int scsi_sysfs_add_host(struct Scsi_Host *shost)
932 {
933         int error, i;
934
935         if (shost->hostt->shost_attrs) {
936                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
937                         error = class_attr_add(&shost->shost_classdev,
938                                         shost->hostt->shost_attrs[i]);
939                         if (error)
940                                 return error;
941                 }
942         }
943
944         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
945                 if (!class_attr_overridden(shost->hostt->shost_attrs,
946                                         scsi_sysfs_shost_attrs[i])) {
947                         error = class_device_create_file(&shost->shost_classdev,
948                                         scsi_sysfs_shost_attrs[i]);
949                         if (error)
950                                 return error;
951                 }
952         }
953
954         transport_register_device(&shost->shost_gendev);
955         return 0;
956 }
957
958 static struct device_type scsi_dev_type = {
959         .name =         "scsi_device",
960         .release =      scsi_device_dev_release,
961         .groups =       scsi_sdev_attr_groups,
962 };
963
964 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
965 {
966         unsigned long flags;
967         struct Scsi_Host *shost = sdev->host;
968         struct scsi_target  *starget = sdev->sdev_target;
969
970         device_initialize(&sdev->sdev_gendev);
971         sdev->sdev_gendev.bus = &scsi_bus_type;
972         sdev->sdev_gendev.type = &scsi_dev_type;
973         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
974                 sdev->host->host_no, sdev->channel, sdev->id,
975                 sdev->lun);
976         
977         class_device_initialize(&sdev->sdev_classdev);
978         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
979         sdev->sdev_classdev.class = &sdev_class;
980         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
981                  "%d:%d:%d:%d", sdev->host->host_no,
982                  sdev->channel, sdev->id, sdev->lun);
983         sdev->scsi_level = starget->scsi_level;
984         transport_setup_device(&sdev->sdev_gendev);
985         spin_lock_irqsave(shost->host_lock, flags);
986         list_add_tail(&sdev->same_target_siblings, &starget->devices);
987         list_add_tail(&sdev->siblings, &shost->__devices);
988         spin_unlock_irqrestore(shost->host_lock, flags);
989 }
990
991 int scsi_is_sdev_device(const struct device *dev)
992 {
993         return dev->type == &scsi_dev_type;
994 }
995 EXPORT_SYMBOL(scsi_is_sdev_device);
996
997 /* A blank transport template that is used in drivers that don't
998  * yet implement Transport Attributes */
999 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };