[SCSI] fix scsi_is_sdev_device() after switch to default sdev attributes
[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, char **envp, int num_envp,
323                            char *buffer, int buffer_size)
324 {
325         struct scsi_device *sdev = to_scsi_device(dev);
326         int i = 0;
327         int length = 0;
328
329         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
330                        "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
331         envp[i] = NULL;
332         return 0;
333 }
334
335 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
336 {
337         struct device_driver *drv = dev->driver;
338         struct scsi_device *sdev = to_scsi_device(dev);
339         int err;
340
341         err = scsi_device_quiesce(sdev);
342         if (err)
343                 return err;
344
345         if (drv && drv->suspend) {
346                 err = drv->suspend(dev, state);
347                 if (err)
348                         return err;
349         }
350
351         return 0;
352 }
353
354 static int scsi_bus_resume(struct device * dev)
355 {
356         struct device_driver *drv = dev->driver;
357         struct scsi_device *sdev = to_scsi_device(dev);
358         int err = 0;
359
360         if (drv && drv->resume)
361                 err = drv->resume(dev);
362
363         scsi_device_resume(sdev);
364
365         return err;
366 }
367
368 struct bus_type scsi_bus_type = {
369         .name           = "scsi",
370         .match          = scsi_bus_match,
371         .uevent         = scsi_bus_uevent,
372         .suspend        = scsi_bus_suspend,
373         .resume         = scsi_bus_resume,
374 };
375
376 int scsi_sysfs_register(void)
377 {
378         int error;
379
380         error = bus_register(&scsi_bus_type);
381         if (!error) {
382                 error = class_register(&sdev_class);
383                 if (error)
384                         bus_unregister(&scsi_bus_type);
385         }
386
387         return error;
388 }
389
390 void scsi_sysfs_unregister(void)
391 {
392         class_unregister(&sdev_class);
393         bus_unregister(&scsi_bus_type);
394 }
395
396 /*
397  * sdev_show_function: macro to create an attr function that can be used to
398  * show a non-bit field.
399  */
400 #define sdev_show_function(field, format_string)                                \
401 static ssize_t                                                          \
402 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
403 {                                                                       \
404         struct scsi_device *sdev;                                       \
405         sdev = to_scsi_device(dev);                                     \
406         return snprintf (buf, 20, format_string, sdev->field);          \
407 }                                                                       \
408
409 /*
410  * sdev_rd_attr: macro to create a function and attribute variable for a
411  * read only field.
412  */
413 #define sdev_rd_attr(field, format_string)                              \
414         sdev_show_function(field, format_string)                        \
415 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
416
417
418 /*
419  * sdev_rd_attr: create a function and attribute variable for a
420  * read/write field.
421  */
422 #define sdev_rw_attr(field, format_string)                              \
423         sdev_show_function(field, format_string)                                \
424                                                                         \
425 static ssize_t                                                          \
426 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
427 {                                                                       \
428         struct scsi_device *sdev;                                       \
429         sdev = to_scsi_device(dev);                                     \
430         snscanf (buf, 20, format_string, &sdev->field);                 \
431         return count;                                                   \
432 }                                                                       \
433 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
434
435 /* Currently we don't export bit fields, but we might in future,
436  * so leave this code in */
437 #if 0
438 /*
439  * sdev_rd_attr: create a function and attribute variable for a
440  * read/write bit field.
441  */
442 #define sdev_rw_attr_bit(field)                                         \
443         sdev_show_function(field, "%d\n")                                       \
444                                                                         \
445 static ssize_t                                                          \
446 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
447 {                                                                       \
448         int ret;                                                        \
449         struct scsi_device *sdev;                                       \
450         ret = scsi_sdev_check_buf_bit(buf);                             \
451         if (ret >= 0)   {                                               \
452                 sdev = to_scsi_device(dev);                             \
453                 sdev->field = ret;                                      \
454                 ret = count;                                            \
455         }                                                               \
456         return ret;                                                     \
457 }                                                                       \
458 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
459
460 /*
461  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
462  * else return -EINVAL.
463  */
464 static int scsi_sdev_check_buf_bit(const char *buf)
465 {
466         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
467                 if (buf[0] == '1')
468                         return 1;
469                 else if (buf[0] == '0')
470                         return 0;
471                 else 
472                         return -EINVAL;
473         } else
474                 return -EINVAL;
475 }
476 #endif
477 /*
478  * Create the actual show/store functions and data structures.
479  */
480 sdev_rd_attr (device_blocked, "%d\n");
481 sdev_rd_attr (queue_depth, "%d\n");
482 sdev_rd_attr (type, "%d\n");
483 sdev_rd_attr (scsi_level, "%d\n");
484 sdev_rd_attr (vendor, "%.8s\n");
485 sdev_rd_attr (model, "%.16s\n");
486 sdev_rd_attr (rev, "%.4s\n");
487
488 static ssize_t
489 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
490 {
491         struct scsi_device *sdev;
492         sdev = to_scsi_device(dev);
493         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
494 }
495
496 static ssize_t
497 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
498 {
499         struct scsi_device *sdev;
500         int timeout;
501         sdev = to_scsi_device(dev);
502         sscanf (buf, "%d\n", &timeout);
503         sdev->timeout = timeout * HZ;
504         return count;
505 }
506 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
507
508 static ssize_t
509 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
510 {
511         scsi_rescan_device(dev);
512         return count;
513 }
514 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
515
516 static void sdev_store_delete_callback(struct device *dev)
517 {
518         scsi_remove_device(to_scsi_device(dev));
519 }
520
521 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
522                                  size_t count)
523 {
524         int rc;
525
526         /* An attribute cannot be unregistered by one of its own methods,
527          * so we have to use this roundabout approach.
528          */
529         rc = device_schedule_callback(dev, sdev_store_delete_callback);
530         if (rc)
531                 count = rc;
532         return count;
533 };
534 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
535
536 static ssize_t
537 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
538 {
539         int i;
540         struct scsi_device *sdev = to_scsi_device(dev);
541         enum scsi_device_state state = 0;
542
543         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
544                 const int len = strlen(sdev_states[i].name);
545                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
546                    buf[len] == '\n') {
547                         state = sdev_states[i].value;
548                         break;
549                 }
550         }
551         if (!state)
552                 return -EINVAL;
553
554         if (scsi_device_set_state(sdev, state))
555                 return -EINVAL;
556         return count;
557 }
558
559 static ssize_t
560 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
561 {
562         struct scsi_device *sdev = to_scsi_device(dev);
563         const char *name = scsi_device_state_name(sdev->sdev_state);
564
565         if (!name)
566                 return -EINVAL;
567
568         return snprintf(buf, 20, "%s\n", name);
569 }
570
571 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
572
573 static ssize_t
574 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
575 {
576         struct scsi_device *sdev = to_scsi_device(dev);
577         const char *name = "none";
578
579         if (sdev->ordered_tags)
580                 name = "ordered";
581         else if (sdev->simple_tags)
582                 name = "simple";
583
584         return snprintf(buf, 20, "%s\n", name);
585 }
586
587 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
588
589 static ssize_t
590 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
591 {
592         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
593 }
594
595 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
596
597 #define show_sdev_iostat(field)                                         \
598 static ssize_t                                                          \
599 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
600 {                                                                       \
601         struct scsi_device *sdev = to_scsi_device(dev);                 \
602         unsigned long long count = atomic_read(&sdev->field);           \
603         return snprintf(buf, 20, "0x%llx\n", count);                    \
604 }                                                                       \
605 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
606
607 show_sdev_iostat(iorequest_cnt);
608 show_sdev_iostat(iodone_cnt);
609 show_sdev_iostat(ioerr_cnt);
610
611 static ssize_t
612 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
613 {
614         struct scsi_device *sdev;
615         sdev = to_scsi_device(dev);
616         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
617 }
618 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
619
620 /* Default template for device attributes.  May NOT be modified */
621 static struct attribute *scsi_sdev_attrs[] = {
622         &dev_attr_device_blocked.attr,
623         &dev_attr_type.attr,
624         &dev_attr_scsi_level.attr,
625         &dev_attr_vendor.attr,
626         &dev_attr_model.attr,
627         &dev_attr_rev.attr,
628         &dev_attr_rescan.attr,
629         &dev_attr_delete.attr,
630         &dev_attr_state.attr,
631         &dev_attr_timeout.attr,
632         &dev_attr_iocounterbits.attr,
633         &dev_attr_iorequest_cnt.attr,
634         &dev_attr_iodone_cnt.attr,
635         &dev_attr_ioerr_cnt.attr,
636         &dev_attr_modalias.attr,
637         NULL
638 };
639
640 static struct attribute_group scsi_sdev_attr_group = {
641         .attrs =        scsi_sdev_attrs,
642 };
643
644 static struct attribute_group *scsi_sdev_attr_groups[] = {
645         &scsi_sdev_attr_group,
646         NULL
647 };
648
649 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
650                                          size_t count)
651 {
652         int depth, retval;
653         struct scsi_device *sdev = to_scsi_device(dev);
654         struct scsi_host_template *sht = sdev->host->hostt;
655
656         if (!sht->change_queue_depth)
657                 return -EINVAL;
658
659         depth = simple_strtoul(buf, NULL, 0);
660
661         if (depth < 1)
662                 return -EINVAL;
663
664         retval = sht->change_queue_depth(sdev, depth);
665         if (retval < 0)
666                 return retval;
667
668         return count;
669 }
670
671 static struct device_attribute sdev_attr_queue_depth_rw =
672         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
673                sdev_store_queue_depth_rw);
674
675 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
676                                         size_t count)
677 {
678         struct scsi_device *sdev = to_scsi_device(dev);
679         struct scsi_host_template *sht = sdev->host->hostt;
680         int tag_type = 0, retval;
681         int prev_tag_type = scsi_get_tag_type(sdev);
682
683         if (!sdev->tagged_supported || !sht->change_queue_type)
684                 return -EINVAL;
685
686         if (strncmp(buf, "ordered", 7) == 0)
687                 tag_type = MSG_ORDERED_TAG;
688         else if (strncmp(buf, "simple", 6) == 0)
689                 tag_type = MSG_SIMPLE_TAG;
690         else if (strncmp(buf, "none", 4) != 0)
691                 return -EINVAL;
692
693         if (tag_type == prev_tag_type)
694                 return count;
695
696         retval = sht->change_queue_type(sdev, tag_type);
697         if (retval < 0)
698                 return retval;
699
700         return count;
701 }
702
703 static struct device_attribute sdev_attr_queue_type_rw =
704         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
705                sdev_store_queue_type_rw);
706
707 /**
708  * scsi_sysfs_add_sdev - add scsi device to sysfs
709  * @sdev:       scsi_device to add
710  *
711  * Return value:
712  *      0 on Success / non-zero on Failure
713  **/
714 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
715 {
716         int error, i;
717         struct request_queue *rq = sdev->request_queue;
718
719         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
720                 return error;
721
722         error = device_add(&sdev->sdev_gendev);
723         if (error) {
724                 put_device(sdev->sdev_gendev.parent);
725                 printk(KERN_INFO "error 1\n");
726                 return error;
727         }
728         error = class_device_add(&sdev->sdev_classdev);
729         if (error) {
730                 printk(KERN_INFO "error 2\n");
731                 goto clean_device;
732         }
733
734         /* take a reference for the sdev_classdev; this is
735          * released by the sdev_class .release */
736         get_device(&sdev->sdev_gendev);
737
738         /* create queue files, which may be writable, depending on the host */
739         if (sdev->host->hostt->change_queue_depth)
740                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
741         else
742                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
743         if (error) {
744                 __scsi_remove_device(sdev);
745                 goto out;
746         }
747         if (sdev->host->hostt->change_queue_type)
748                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
749         else
750                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
751         if (error) {
752                 __scsi_remove_device(sdev);
753                 goto out;
754         }
755
756         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
757
758         if (error)
759                 sdev_printk(KERN_INFO, sdev,
760                             "Failed to register bsg queue, errno=%d\n", error);
761
762         /* we're treating error on bsg register as non-fatal, so pretend
763          * nothing went wrong */
764         error = 0;
765
766         /* add additional host specific attributes */
767         if (sdev->host->hostt->sdev_attrs) {
768                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
769                         error = device_create_file(&sdev->sdev_gendev,
770                                         sdev->host->hostt->sdev_attrs[i]);
771                         if (error) {
772                                 __scsi_remove_device(sdev);
773                                 goto out;
774                         }
775                 }
776         }
777
778         transport_add_device(&sdev->sdev_gendev);
779  out:
780         return error;
781
782  clean_device:
783         scsi_device_set_state(sdev, SDEV_CANCEL);
784
785         device_del(&sdev->sdev_gendev);
786         transport_destroy_device(&sdev->sdev_gendev);
787         put_device(&sdev->sdev_gendev);
788
789         return error;
790 }
791
792 void __scsi_remove_device(struct scsi_device *sdev)
793 {
794         struct device *dev = &sdev->sdev_gendev;
795
796         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
797                 return;
798
799         bsg_unregister_queue(sdev->request_queue);
800         class_device_unregister(&sdev->sdev_classdev);
801         transport_remove_device(dev);
802         device_del(dev);
803         scsi_device_set_state(sdev, SDEV_DEL);
804         if (sdev->host->hostt->slave_destroy)
805                 sdev->host->hostt->slave_destroy(sdev);
806         transport_destroy_device(dev);
807         put_device(dev);
808 }
809
810 /**
811  * scsi_remove_device - unregister a device from the scsi bus
812  * @sdev:       scsi_device to unregister
813  **/
814 void scsi_remove_device(struct scsi_device *sdev)
815 {
816         struct Scsi_Host *shost = sdev->host;
817
818         mutex_lock(&shost->scan_mutex);
819         __scsi_remove_device(sdev);
820         mutex_unlock(&shost->scan_mutex);
821 }
822 EXPORT_SYMBOL(scsi_remove_device);
823
824 static void __scsi_remove_target(struct scsi_target *starget)
825 {
826         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
827         unsigned long flags;
828         struct scsi_device *sdev;
829
830         spin_lock_irqsave(shost->host_lock, flags);
831         starget->reap_ref++;
832  restart:
833         list_for_each_entry(sdev, &shost->__devices, siblings) {
834                 if (sdev->channel != starget->channel ||
835                     sdev->id != starget->id ||
836                     sdev->sdev_state == SDEV_DEL)
837                         continue;
838                 spin_unlock_irqrestore(shost->host_lock, flags);
839                 scsi_remove_device(sdev);
840                 spin_lock_irqsave(shost->host_lock, flags);
841                 goto restart;
842         }
843         spin_unlock_irqrestore(shost->host_lock, flags);
844         scsi_target_reap(starget);
845 }
846
847 static int __remove_child (struct device * dev, void * data)
848 {
849         if (scsi_is_target_device(dev))
850                 __scsi_remove_target(to_scsi_target(dev));
851         return 0;
852 }
853
854 /**
855  * scsi_remove_target - try to remove a target and all its devices
856  * @dev: generic starget or parent of generic stargets to be removed
857  *
858  * Note: This is slightly racy.  It is possible that if the user
859  * requests the addition of another device then the target won't be
860  * removed.
861  */
862 void scsi_remove_target(struct device *dev)
863 {
864         struct device *rdev;
865
866         if (scsi_is_target_device(dev)) {
867                 __scsi_remove_target(to_scsi_target(dev));
868                 return;
869         }
870
871         rdev = get_device(dev);
872         device_for_each_child(dev, NULL, __remove_child);
873         put_device(rdev);
874 }
875 EXPORT_SYMBOL(scsi_remove_target);
876
877 int scsi_register_driver(struct device_driver *drv)
878 {
879         drv->bus = &scsi_bus_type;
880
881         return driver_register(drv);
882 }
883 EXPORT_SYMBOL(scsi_register_driver);
884
885 int scsi_register_interface(struct class_interface *intf)
886 {
887         intf->class = &sdev_class;
888
889         return class_interface_register(intf);
890 }
891 EXPORT_SYMBOL(scsi_register_interface);
892
893
894 static struct class_device_attribute *class_attr_overridden(
895                 struct class_device_attribute **attrs,
896                 struct class_device_attribute *attr)
897 {
898         int i;
899
900         if (!attrs)
901                 return NULL;
902         for (i = 0; attrs[i]; i++)
903                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
904                         return attrs[i];
905         return NULL;
906 }
907
908 static int class_attr_add(struct class_device *classdev,
909                 struct class_device_attribute *attr)
910 {
911         struct class_device_attribute *base_attr;
912
913         /*
914          * Spare the caller from having to copy things it's not interested in.
915          */
916         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
917         if (base_attr) {
918                 /* extend permissions */
919                 attr->attr.mode |= base_attr->attr.mode;
920
921                 /* override null show/store with default */
922                 if (!attr->show)
923                         attr->show = base_attr->show;
924                 if (!attr->store)
925                         attr->store = base_attr->store;
926         }
927
928         return class_device_create_file(classdev, attr);
929 }
930
931 /**
932  * scsi_sysfs_add_host - add scsi host to subsystem
933  * @shost:     scsi host struct to add to subsystem
934  * @dev:       parent struct device pointer
935  **/
936 int scsi_sysfs_add_host(struct Scsi_Host *shost)
937 {
938         int error, i;
939
940         if (shost->hostt->shost_attrs) {
941                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
942                         error = class_attr_add(&shost->shost_classdev,
943                                         shost->hostt->shost_attrs[i]);
944                         if (error)
945                                 return error;
946                 }
947         }
948
949         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
950                 if (!class_attr_overridden(shost->hostt->shost_attrs,
951                                         scsi_sysfs_shost_attrs[i])) {
952                         error = class_device_create_file(&shost->shost_classdev,
953                                         scsi_sysfs_shost_attrs[i]);
954                         if (error)
955                                 return error;
956                 }
957         }
958
959         transport_register_device(&shost->shost_gendev);
960         return 0;
961 }
962
963 static struct device_type scsi_dev_type = {
964         .name =         "scsi_device",
965         .release =      scsi_device_dev_release,
966         .groups =       scsi_sdev_attr_groups,
967 };
968
969 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
970 {
971         unsigned long flags;
972         struct Scsi_Host *shost = sdev->host;
973         struct scsi_target  *starget = sdev->sdev_target;
974
975         device_initialize(&sdev->sdev_gendev);
976         sdev->sdev_gendev.bus = &scsi_bus_type;
977         sdev->sdev_gendev.type = &scsi_dev_type;
978         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
979                 sdev->host->host_no, sdev->channel, sdev->id,
980                 sdev->lun);
981         
982         class_device_initialize(&sdev->sdev_classdev);
983         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
984         sdev->sdev_classdev.class = &sdev_class;
985         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
986                  "%d:%d:%d:%d", sdev->host->host_no,
987                  sdev->channel, sdev->id, sdev->lun);
988         sdev->scsi_level = starget->scsi_level;
989         transport_setup_device(&sdev->sdev_gendev);
990         spin_lock_irqsave(shost->host_lock, flags);
991         list_add_tail(&sdev->same_target_siblings, &starget->devices);
992         list_add_tail(&sdev->siblings, &shost->__devices);
993         spin_unlock_irqrestore(shost->host_lock, flags);
994 }
995
996 int scsi_is_sdev_device(const struct device *dev)
997 {
998         return dev->type == &scsi_dev_type;
999 }
1000 EXPORT_SYMBOL(scsi_is_sdev_device);
1001
1002 /* A blank transport template that is used in drivers that don't
1003  * yet implement Transport Attributes */
1004 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };