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