fbd7f9ed1251feb5dab52bf1c92b48c4045b6886
[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 struct device_type scsi_dev_type;
25
26 static const struct {
27         enum scsi_device_state  value;
28         char                    *name;
29 } sdev_states[] = {
30         { SDEV_CREATED, "created" },
31         { SDEV_RUNNING, "running" },
32         { SDEV_CANCEL, "cancel" },
33         { SDEV_DEL, "deleted" },
34         { SDEV_QUIESCE, "quiesce" },
35         { SDEV_OFFLINE, "offline" },
36         { SDEV_BLOCK,   "blocked" },
37 };
38
39 const char *scsi_device_state_name(enum scsi_device_state state)
40 {
41         int i;
42         char *name = NULL;
43
44         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
45                 if (sdev_states[i].value == state) {
46                         name = sdev_states[i].name;
47                         break;
48                 }
49         }
50         return name;
51 }
52
53 static const struct {
54         enum scsi_host_state    value;
55         char                    *name;
56 } shost_states[] = {
57         { SHOST_CREATED, "created" },
58         { SHOST_RUNNING, "running" },
59         { SHOST_CANCEL, "cancel" },
60         { SHOST_DEL, "deleted" },
61         { SHOST_RECOVERY, "recovery" },
62         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
63         { SHOST_DEL_RECOVERY, "deleted/recovery", },
64 };
65 const char *scsi_host_state_name(enum scsi_host_state state)
66 {
67         int i;
68         char *name = NULL;
69
70         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
71                 if (shost_states[i].value == state) {
72                         name = shost_states[i].name;
73                         break;
74                 }
75         }
76         return name;
77 }
78
79 static int check_set(unsigned int *val, char *src)
80 {
81         char *last;
82
83         if (strncmp(src, "-", 20) == 0) {
84                 *val = SCAN_WILD_CARD;
85         } else {
86                 /*
87                  * Doesn't check for int overflow
88                  */
89                 *val = simple_strtoul(src, &last, 0);
90                 if (*last != '\0')
91                         return 1;
92         }
93         return 0;
94 }
95
96 static int scsi_scan(struct Scsi_Host *shost, const char *str)
97 {
98         char s1[15], s2[15], s3[15], junk;
99         unsigned int channel, id, lun;
100         int res;
101
102         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
103         if (res != 3)
104                 return -EINVAL;
105         if (check_set(&channel, s1))
106                 return -EINVAL;
107         if (check_set(&id, s2))
108                 return -EINVAL;
109         if (check_set(&lun, s3))
110                 return -EINVAL;
111         if (shost->transportt->user_scan)
112                 res = shost->transportt->user_scan(shost, channel, id, lun);
113         else
114                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
115         return res;
116 }
117
118 /*
119  * shost_show_function: macro to create an attr function that can be used to
120  * show a non-bit field.
121  */
122 #define shost_show_function(name, field, format_string)                 \
123 static ssize_t                                                          \
124 show_##name (struct device *dev, struct device_attribute *attr,         \
125              char *buf)                                                 \
126 {                                                                       \
127         struct Scsi_Host *shost = class_to_shost(dev);                  \
128         return snprintf (buf, 20, format_string, shost->field);         \
129 }
130
131 /*
132  * shost_rd_attr: macro to create a function and attribute variable for a
133  * read only field.
134  */
135 #define shost_rd_attr2(name, field, format_string)                      \
136         shost_show_function(name, field, format_string)                 \
137 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
138
139 #define shost_rd_attr(field, format_string) \
140 shost_rd_attr2(field, field, format_string)
141
142 /*
143  * Create the actual show/store functions and data structures.
144  */
145
146 static ssize_t
147 store_scan(struct device *dev, struct device_attribute *attr,
148            const char *buf, size_t count)
149 {
150         struct Scsi_Host *shost = class_to_shost(dev);
151         int res;
152
153         res = scsi_scan(shost, buf);
154         if (res == 0)
155                 res = count;
156         return res;
157 };
158 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
159
160 static ssize_t
161 store_shost_state(struct device *dev, struct device_attribute *attr,
162                   const char *buf, size_t count)
163 {
164         int i;
165         struct Scsi_Host *shost = class_to_shost(dev);
166         enum scsi_host_state state = 0;
167
168         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
169                 const int len = strlen(shost_states[i].name);
170                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
171                    buf[len] == '\n') {
172                         state = shost_states[i].value;
173                         break;
174                 }
175         }
176         if (!state)
177                 return -EINVAL;
178
179         if (scsi_host_set_state(shost, state))
180                 return -EINVAL;
181         return count;
182 }
183
184 static ssize_t
185 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
186 {
187         struct Scsi_Host *shost = class_to_shost(dev);
188         const char *name = scsi_host_state_name(shost->shost_state);
189
190         if (!name)
191                 return -EINVAL;
192
193         return snprintf(buf, 20, "%s\n", name);
194 }
195
196 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
197 struct device_attribute dev_attr_hstate =
198         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
199
200 static ssize_t
201 show_shost_mode(unsigned int mode, char *buf)
202 {
203         ssize_t len = 0;
204
205         if (mode & MODE_INITIATOR)
206                 len = sprintf(buf, "%s", "Initiator");
207
208         if (mode & MODE_TARGET)
209                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
210
211         len += sprintf(buf + len, "\n");
212
213         return len;
214 }
215
216 static ssize_t
217 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
218                           char *buf)
219 {
220         struct Scsi_Host *shost = class_to_shost(dev);
221         unsigned int supported_mode = shost->hostt->supported_mode;
222
223         if (supported_mode == MODE_UNKNOWN)
224                 /* by default this should be initiator */
225                 supported_mode = MODE_INITIATOR;
226
227         return show_shost_mode(supported_mode, buf);
228 }
229
230 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
231
232 static ssize_t
233 show_shost_active_mode(struct device *dev,
234                        struct device_attribute *attr, char *buf)
235 {
236         struct Scsi_Host *shost = class_to_shost(dev);
237
238         if (shost->active_mode == MODE_UNKNOWN)
239                 return snprintf(buf, 20, "unknown\n");
240         else
241                 return show_shost_mode(shost->active_mode, buf);
242 }
243
244 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
245
246 shost_rd_attr(unique_id, "%u\n");
247 shost_rd_attr(host_busy, "%hu\n");
248 shost_rd_attr(cmd_per_lun, "%hd\n");
249 shost_rd_attr(can_queue, "%hd\n");
250 shost_rd_attr(sg_tablesize, "%hu\n");
251 shost_rd_attr(unchecked_isa_dma, "%d\n");
252 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
253
254 static struct device_attribute *scsi_sysfs_shost_attrs[] = {
255         &dev_attr_unique_id,
256         &dev_attr_host_busy,
257         &dev_attr_cmd_per_lun,
258         &dev_attr_can_queue,
259         &dev_attr_sg_tablesize,
260         &dev_attr_unchecked_isa_dma,
261         &dev_attr_proc_name,
262         &dev_attr_scan,
263         &dev_attr_hstate,
264         &dev_attr_supported_mode,
265         &dev_attr_active_mode,
266         NULL
267 };
268
269 static void scsi_device_cls_release(struct device *class_dev)
270 {
271         struct scsi_device *sdev;
272
273         sdev = class_to_sdev(class_dev);
274         put_device(&sdev->sdev_gendev);
275 }
276
277 static void scsi_device_dev_release_usercontext(struct work_struct *work)
278 {
279         struct scsi_device *sdev;
280         struct device *parent;
281         struct scsi_target *starget;
282         struct list_head *this, *tmp;
283         unsigned long flags;
284
285         sdev = container_of(work, struct scsi_device, ew.work);
286
287         parent = sdev->sdev_gendev.parent;
288         starget = to_scsi_target(parent);
289
290         spin_lock_irqsave(sdev->host->host_lock, flags);
291         starget->reap_ref++;
292         list_del(&sdev->siblings);
293         list_del(&sdev->same_target_siblings);
294         list_del(&sdev->starved_entry);
295         spin_unlock_irqrestore(sdev->host->host_lock, flags);
296
297         cancel_work_sync(&sdev->event_work);
298
299         list_for_each_safe(this, tmp, &sdev->event_list) {
300                 struct scsi_event *evt;
301
302                 evt = list_entry(this, struct scsi_event, node);
303                 list_del(&evt->node);
304                 kfree(evt);
305         }
306
307         if (sdev->request_queue) {
308                 sdev->request_queue->queuedata = NULL;
309                 /* user context needed to free queue */
310                 scsi_free_queue(sdev->request_queue);
311                 /* temporary expedient, try to catch use of queue lock
312                  * after free of sdev */
313                 sdev->request_queue = NULL;
314         }
315
316         scsi_target_reap(scsi_target(sdev));
317
318         kfree(sdev->inquiry);
319         kfree(sdev);
320
321         if (parent)
322                 put_device(parent);
323 }
324
325 static void scsi_device_dev_release(struct device *dev)
326 {
327         struct scsi_device *sdp = to_scsi_device(dev);
328         execute_in_process_context(scsi_device_dev_release_usercontext,
329                                    &sdp->ew);
330 }
331
332 static struct class sdev_class = {
333         .name           = "scsi_device",
334         .dev_release    = scsi_device_cls_release,
335 };
336
337 /* all probing is done in the individual ->probe routines */
338 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
339 {
340         struct scsi_device *sdp;
341
342         if (dev->type != &scsi_dev_type)
343                 return 0;
344
345         sdp = to_scsi_device(dev);
346         if (sdp->no_uld_attach)
347                 return 0;
348         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
349 }
350
351 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
352 {
353         struct scsi_device *sdev = to_scsi_device(dev);
354
355         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
356         return 0;
357 }
358
359 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
360 {
361         struct device_driver *drv;
362         struct scsi_device *sdev;
363         int err;
364
365         if (dev->type != &scsi_dev_type)
366                 return 0;
367
368         drv = dev->driver;
369         sdev = to_scsi_device(dev);
370
371         err = scsi_device_quiesce(sdev);
372         if (err)
373                 return err;
374
375         if (drv && drv->suspend) {
376                 err = drv->suspend(dev, state);
377                 if (err)
378                         return err;
379         }
380
381         return 0;
382 }
383
384 static int scsi_bus_resume(struct device * dev)
385 {
386         struct device_driver *drv;
387         struct scsi_device *sdev;
388         int err = 0;
389
390         if (dev->type != &scsi_dev_type)
391                 return 0;
392
393         drv = dev->driver;
394         sdev = to_scsi_device(dev);
395
396         if (drv && drv->resume)
397                 err = drv->resume(dev);
398
399         scsi_device_resume(sdev);
400
401         return err;
402 }
403
404 static int scsi_bus_remove(struct device *dev)
405 {
406         struct device_driver *drv = dev->driver;
407         struct scsi_device *sdev = to_scsi_device(dev);
408         int err = 0;
409
410         /* reset the prep_fn back to the default since the
411          * driver may have altered it and it's being removed */
412         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
413
414         if (drv && drv->remove)
415                 err = drv->remove(dev);
416
417         return 0;
418 }
419
420 struct bus_type scsi_bus_type = {
421         .name           = "scsi",
422         .match          = scsi_bus_match,
423         .uevent         = scsi_bus_uevent,
424         .suspend        = scsi_bus_suspend,
425         .resume         = scsi_bus_resume,
426         .remove         = scsi_bus_remove,
427 };
428
429 int scsi_sysfs_register(void)
430 {
431         int error;
432
433         error = bus_register(&scsi_bus_type);
434         if (!error) {
435                 error = class_register(&sdev_class);
436                 if (error)
437                         bus_unregister(&scsi_bus_type);
438         }
439
440         return error;
441 }
442
443 void scsi_sysfs_unregister(void)
444 {
445         class_unregister(&sdev_class);
446         bus_unregister(&scsi_bus_type);
447 }
448
449 /*
450  * sdev_show_function: macro to create an attr function that can be used to
451  * show a non-bit field.
452  */
453 #define sdev_show_function(field, format_string)                                \
454 static ssize_t                                                          \
455 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
456                    char *buf)                                           \
457 {                                                                       \
458         struct scsi_device *sdev;                                       \
459         sdev = to_scsi_device(dev);                                     \
460         return snprintf (buf, 20, format_string, sdev->field);          \
461 }                                                                       \
462
463 /*
464  * sdev_rd_attr: macro to create a function and attribute variable for a
465  * read only field.
466  */
467 #define sdev_rd_attr(field, format_string)                              \
468         sdev_show_function(field, format_string)                        \
469 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
470
471
472 /*
473  * sdev_rd_attr: create a function and attribute variable for a
474  * read/write field.
475  */
476 #define sdev_rw_attr(field, format_string)                              \
477         sdev_show_function(field, format_string)                                \
478                                                                         \
479 static ssize_t                                                          \
480 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
481                     const char *buf, size_t count)                      \
482 {                                                                       \
483         struct scsi_device *sdev;                                       \
484         sdev = to_scsi_device(dev);                                     \
485         snscanf (buf, 20, format_string, &sdev->field);                 \
486         return count;                                                   \
487 }                                                                       \
488 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
489
490 /* Currently we don't export bit fields, but we might in future,
491  * so leave this code in */
492 #if 0
493 /*
494  * sdev_rd_attr: create a function and attribute variable for a
495  * read/write bit field.
496  */
497 #define sdev_rw_attr_bit(field)                                         \
498         sdev_show_function(field, "%d\n")                                       \
499                                                                         \
500 static ssize_t                                                          \
501 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
502                     const char *buf, size_t count)                      \
503 {                                                                       \
504         int ret;                                                        \
505         struct scsi_device *sdev;                                       \
506         ret = scsi_sdev_check_buf_bit(buf);                             \
507         if (ret >= 0)   {                                               \
508                 sdev = to_scsi_device(dev);                             \
509                 sdev->field = ret;                                      \
510                 ret = count;                                            \
511         }                                                               \
512         return ret;                                                     \
513 }                                                                       \
514 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
515
516 /*
517  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
518  * else return -EINVAL.
519  */
520 static int scsi_sdev_check_buf_bit(const char *buf)
521 {
522         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
523                 if (buf[0] == '1')
524                         return 1;
525                 else if (buf[0] == '0')
526                         return 0;
527                 else 
528                         return -EINVAL;
529         } else
530                 return -EINVAL;
531 }
532 #endif
533 /*
534  * Create the actual show/store functions and data structures.
535  */
536 sdev_rd_attr (device_blocked, "%d\n");
537 sdev_rd_attr (queue_depth, "%d\n");
538 sdev_rd_attr (type, "%d\n");
539 sdev_rd_attr (scsi_level, "%d\n");
540 sdev_rd_attr (vendor, "%.8s\n");
541 sdev_rd_attr (model, "%.16s\n");
542 sdev_rd_attr (rev, "%.4s\n");
543
544 static ssize_t
545 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
546 {
547         struct scsi_device *sdev;
548         sdev = to_scsi_device(dev);
549         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
550 }
551
552 static ssize_t
553 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
554                     const char *buf, size_t count)
555 {
556         struct scsi_device *sdev;
557         int timeout;
558         sdev = to_scsi_device(dev);
559         sscanf (buf, "%d\n", &timeout);
560         sdev->timeout = timeout * HZ;
561         return count;
562 }
563 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
564
565 static ssize_t
566 store_rescan_field (struct device *dev, struct device_attribute *attr,
567                     const char *buf, size_t count)
568 {
569         scsi_rescan_device(dev);
570         return count;
571 }
572 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
573
574 static void sdev_store_delete_callback(struct device *dev)
575 {
576         scsi_remove_device(to_scsi_device(dev));
577 }
578
579 static ssize_t
580 sdev_store_delete(struct device *dev, struct device_attribute *attr,
581                   const char *buf, size_t count)
582 {
583         int rc;
584
585         /* An attribute cannot be unregistered by one of its own methods,
586          * so we have to use this roundabout approach.
587          */
588         rc = device_schedule_callback(dev, sdev_store_delete_callback);
589         if (rc)
590                 count = rc;
591         return count;
592 };
593 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
594
595 static ssize_t
596 store_state_field(struct device *dev, struct device_attribute *attr,
597                   const char *buf, size_t count)
598 {
599         int i;
600         struct scsi_device *sdev = to_scsi_device(dev);
601         enum scsi_device_state state = 0;
602
603         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
604                 const int len = strlen(sdev_states[i].name);
605                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
606                    buf[len] == '\n') {
607                         state = sdev_states[i].value;
608                         break;
609                 }
610         }
611         if (!state)
612                 return -EINVAL;
613
614         if (scsi_device_set_state(sdev, state))
615                 return -EINVAL;
616         return count;
617 }
618
619 static ssize_t
620 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
621 {
622         struct scsi_device *sdev = to_scsi_device(dev);
623         const char *name = scsi_device_state_name(sdev->sdev_state);
624
625         if (!name)
626                 return -EINVAL;
627
628         return snprintf(buf, 20, "%s\n", name);
629 }
630
631 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
632
633 static ssize_t
634 show_queue_type_field(struct device *dev, struct device_attribute *attr,
635                       char *buf)
636 {
637         struct scsi_device *sdev = to_scsi_device(dev);
638         const char *name = "none";
639
640         if (sdev->ordered_tags)
641                 name = "ordered";
642         else if (sdev->simple_tags)
643                 name = "simple";
644
645         return snprintf(buf, 20, "%s\n", name);
646 }
647
648 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
649
650 static ssize_t
651 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
652 {
653         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
654 }
655
656 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
657
658 #define show_sdev_iostat(field)                                         \
659 static ssize_t                                                          \
660 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
661                     char *buf)                                          \
662 {                                                                       \
663         struct scsi_device *sdev = to_scsi_device(dev);                 \
664         unsigned long long count = atomic_read(&sdev->field);           \
665         return snprintf(buf, 20, "0x%llx\n", count);                    \
666 }                                                                       \
667 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
668
669 show_sdev_iostat(iorequest_cnt);
670 show_sdev_iostat(iodone_cnt);
671 show_sdev_iostat(ioerr_cnt);
672
673 static ssize_t
674 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
675 {
676         struct scsi_device *sdev;
677         sdev = to_scsi_device(dev);
678         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
679 }
680 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
681
682 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
683 static ssize_t                                                          \
684 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
685                      char *buf)                                         \
686 {                                                                       \
687         struct scsi_device *sdev = to_scsi_device(dev);                 \
688         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
689         return snprintf(buf, 20, "%d\n", val);                          \
690 }
691
692 #define DECLARE_EVT_STORE(name, Cap_name)                               \
693 static ssize_t                                                          \
694 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
695                       const char *buf, size_t count)                    \
696 {                                                                       \
697         struct scsi_device *sdev = to_scsi_device(dev);                 \
698         int val = simple_strtoul(buf, NULL, 0);                         \
699         if (val == 0)                                                   \
700                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
701         else if (val == 1)                                              \
702                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
703         else                                                            \
704                 return -EINVAL;                                         \
705         return count;                                                   \
706 }
707
708 #define DECLARE_EVT(name, Cap_name)                                     \
709         DECLARE_EVT_SHOW(name, Cap_name)                                \
710         DECLARE_EVT_STORE(name, Cap_name)                               \
711         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
712                            sdev_store_evt_##name);
713 #define REF_EVT(name) &dev_attr_evt_##name.attr
714
715 DECLARE_EVT(media_change, MEDIA_CHANGE)
716
717 /* Default template for device attributes.  May NOT be modified */
718 static struct attribute *scsi_sdev_attrs[] = {
719         &dev_attr_device_blocked.attr,
720         &dev_attr_type.attr,
721         &dev_attr_scsi_level.attr,
722         &dev_attr_vendor.attr,
723         &dev_attr_model.attr,
724         &dev_attr_rev.attr,
725         &dev_attr_rescan.attr,
726         &dev_attr_delete.attr,
727         &dev_attr_state.attr,
728         &dev_attr_timeout.attr,
729         &dev_attr_iocounterbits.attr,
730         &dev_attr_iorequest_cnt.attr,
731         &dev_attr_iodone_cnt.attr,
732         &dev_attr_ioerr_cnt.attr,
733         &dev_attr_modalias.attr,
734         REF_EVT(media_change),
735         NULL
736 };
737
738 static struct attribute_group scsi_sdev_attr_group = {
739         .attrs =        scsi_sdev_attrs,
740 };
741
742 static struct attribute_group *scsi_sdev_attr_groups[] = {
743         &scsi_sdev_attr_group,
744         NULL
745 };
746
747 static ssize_t
748 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
749                           const char *buf, size_t count)
750 {
751         int depth, retval;
752         struct scsi_device *sdev = to_scsi_device(dev);
753         struct scsi_host_template *sht = sdev->host->hostt;
754
755         if (!sht->change_queue_depth)
756                 return -EINVAL;
757
758         depth = simple_strtoul(buf, NULL, 0);
759
760         if (depth < 1)
761                 return -EINVAL;
762
763         retval = sht->change_queue_depth(sdev, depth);
764         if (retval < 0)
765                 return retval;
766
767         return count;
768 }
769
770 static struct device_attribute sdev_attr_queue_depth_rw =
771         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
772                sdev_store_queue_depth_rw);
773
774 static ssize_t
775 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
776                          const char *buf, size_t count)
777 {
778         struct scsi_device *sdev = to_scsi_device(dev);
779         struct scsi_host_template *sht = sdev->host->hostt;
780         int tag_type = 0, retval;
781         int prev_tag_type = scsi_get_tag_type(sdev);
782
783         if (!sdev->tagged_supported || !sht->change_queue_type)
784                 return -EINVAL;
785
786         if (strncmp(buf, "ordered", 7) == 0)
787                 tag_type = MSG_ORDERED_TAG;
788         else if (strncmp(buf, "simple", 6) == 0)
789                 tag_type = MSG_SIMPLE_TAG;
790         else if (strncmp(buf, "none", 4) != 0)
791                 return -EINVAL;
792
793         if (tag_type == prev_tag_type)
794                 return count;
795
796         retval = sht->change_queue_type(sdev, tag_type);
797         if (retval < 0)
798                 return retval;
799
800         return count;
801 }
802
803 static struct device_attribute sdev_attr_queue_type_rw =
804         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
805                sdev_store_queue_type_rw);
806
807 /**
808  * scsi_sysfs_add_sdev - add scsi device to sysfs
809  * @sdev:       scsi_device to add
810  *
811  * Return value:
812  *      0 on Success / non-zero on Failure
813  **/
814 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
815 {
816         int error, i;
817         struct request_queue *rq = sdev->request_queue;
818
819         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
820                 return error;
821
822         error = device_add(&sdev->sdev_gendev);
823         if (error) {
824                 put_device(sdev->sdev_gendev.parent);
825                 printk(KERN_INFO "error 1\n");
826                 return error;
827         }
828         error = device_add(&sdev->sdev_dev);
829         if (error) {
830                 printk(KERN_INFO "error 2\n");
831                 goto clean_device;
832         }
833
834         /* take a reference for the sdev_dev; this is
835          * released by the sdev_class .release */
836         get_device(&sdev->sdev_gendev);
837
838         /* create queue files, which may be writable, depending on the host */
839         if (sdev->host->hostt->change_queue_depth)
840                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
841         else
842                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
843         if (error) {
844                 __scsi_remove_device(sdev);
845                 goto out;
846         }
847         if (sdev->host->hostt->change_queue_type)
848                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
849         else
850                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
851         if (error) {
852                 __scsi_remove_device(sdev);
853                 goto out;
854         }
855
856         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
857
858         if (error)
859                 sdev_printk(KERN_INFO, sdev,
860                             "Failed to register bsg queue, errno=%d\n", error);
861
862         /* we're treating error on bsg register as non-fatal, so pretend
863          * nothing went wrong */
864         error = 0;
865
866         /* add additional host specific attributes */
867         if (sdev->host->hostt->sdev_attrs) {
868                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
869                         error = device_create_file(&sdev->sdev_gendev,
870                                         sdev->host->hostt->sdev_attrs[i]);
871                         if (error) {
872                                 __scsi_remove_device(sdev);
873                                 goto out;
874                         }
875                 }
876         }
877
878         transport_add_device(&sdev->sdev_gendev);
879  out:
880         return error;
881
882  clean_device:
883         scsi_device_set_state(sdev, SDEV_CANCEL);
884
885         device_del(&sdev->sdev_gendev);
886         transport_destroy_device(&sdev->sdev_gendev);
887         put_device(&sdev->sdev_gendev);
888
889         return error;
890 }
891
892 void __scsi_remove_device(struct scsi_device *sdev)
893 {
894         struct device *dev = &sdev->sdev_gendev;
895
896         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
897                 return;
898
899         bsg_unregister_queue(sdev->request_queue);
900         device_unregister(&sdev->sdev_dev);
901         transport_remove_device(dev);
902         device_del(dev);
903         scsi_device_set_state(sdev, SDEV_DEL);
904         if (sdev->host->hostt->slave_destroy)
905                 sdev->host->hostt->slave_destroy(sdev);
906         transport_destroy_device(dev);
907         put_device(dev);
908 }
909
910 /**
911  * scsi_remove_device - unregister a device from the scsi bus
912  * @sdev:       scsi_device to unregister
913  **/
914 void scsi_remove_device(struct scsi_device *sdev)
915 {
916         struct Scsi_Host *shost = sdev->host;
917
918         mutex_lock(&shost->scan_mutex);
919         __scsi_remove_device(sdev);
920         mutex_unlock(&shost->scan_mutex);
921 }
922 EXPORT_SYMBOL(scsi_remove_device);
923
924 static void __scsi_remove_target(struct scsi_target *starget)
925 {
926         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
927         unsigned long flags;
928         struct scsi_device *sdev;
929
930         spin_lock_irqsave(shost->host_lock, flags);
931         starget->reap_ref++;
932  restart:
933         list_for_each_entry(sdev, &shost->__devices, siblings) {
934                 if (sdev->channel != starget->channel ||
935                     sdev->id != starget->id ||
936                     sdev->sdev_state == SDEV_DEL)
937                         continue;
938                 spin_unlock_irqrestore(shost->host_lock, flags);
939                 scsi_remove_device(sdev);
940                 spin_lock_irqsave(shost->host_lock, flags);
941                 goto restart;
942         }
943         spin_unlock_irqrestore(shost->host_lock, flags);
944         scsi_target_reap(starget);
945 }
946
947 static int __remove_child (struct device * dev, void * data)
948 {
949         if (scsi_is_target_device(dev))
950                 __scsi_remove_target(to_scsi_target(dev));
951         return 0;
952 }
953
954 /**
955  * scsi_remove_target - try to remove a target and all its devices
956  * @dev: generic starget or parent of generic stargets to be removed
957  *
958  * Note: This is slightly racy.  It is possible that if the user
959  * requests the addition of another device then the target won't be
960  * removed.
961  */
962 void scsi_remove_target(struct device *dev)
963 {
964         struct device *rdev;
965
966         if (scsi_is_target_device(dev)) {
967                 __scsi_remove_target(to_scsi_target(dev));
968                 return;
969         }
970
971         rdev = get_device(dev);
972         device_for_each_child(dev, NULL, __remove_child);
973         put_device(rdev);
974 }
975 EXPORT_SYMBOL(scsi_remove_target);
976
977 int scsi_register_driver(struct device_driver *drv)
978 {
979         drv->bus = &scsi_bus_type;
980
981         return driver_register(drv);
982 }
983 EXPORT_SYMBOL(scsi_register_driver);
984
985 int scsi_register_interface(struct class_interface *intf)
986 {
987         intf->class = &sdev_class;
988
989         return class_interface_register(intf);
990 }
991 EXPORT_SYMBOL(scsi_register_interface);
992
993
994 static struct device_attribute *class_attr_overridden(
995                 struct device_attribute **attrs,
996                 struct device_attribute *attr)
997 {
998         int i;
999
1000         if (!attrs)
1001                 return NULL;
1002         for (i = 0; attrs[i]; i++)
1003                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
1004                         return attrs[i];
1005         return NULL;
1006 }
1007
1008 static int class_attr_add(struct device *classdev,
1009                 struct device_attribute *attr)
1010 {
1011         struct device_attribute *base_attr;
1012
1013         /*
1014          * Spare the caller from having to copy things it's not interested in.
1015          */
1016         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
1017         if (base_attr) {
1018                 /* extend permissions */
1019                 attr->attr.mode |= base_attr->attr.mode;
1020
1021                 /* override null show/store with default */
1022                 if (!attr->show)
1023                         attr->show = base_attr->show;
1024                 if (!attr->store)
1025                         attr->store = base_attr->store;
1026         }
1027
1028         return device_create_file(classdev, attr);
1029 }
1030
1031 /**
1032  * scsi_sysfs_add_host - add scsi host to subsystem
1033  * @shost:     scsi host struct to add to subsystem
1034  * @dev:       parent struct device pointer
1035  **/
1036 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1037 {
1038         int error, i;
1039
1040         if (shost->hostt->shost_attrs) {
1041                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1042                         error = class_attr_add(&shost->shost_dev,
1043                                         shost->hostt->shost_attrs[i]);
1044                         if (error)
1045                                 return error;
1046                 }
1047         }
1048
1049         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
1050                 if (!class_attr_overridden(shost->hostt->shost_attrs,
1051                                         scsi_sysfs_shost_attrs[i])) {
1052                         error = device_create_file(&shost->shost_dev,
1053                                         scsi_sysfs_shost_attrs[i]);
1054                         if (error)
1055                                 return error;
1056                 }
1057         }
1058
1059         transport_register_device(&shost->shost_gendev);
1060         transport_configure_device(&shost->shost_gendev);
1061         return 0;
1062 }
1063
1064 static struct device_type scsi_dev_type = {
1065         .name =         "scsi_device",
1066         .release =      scsi_device_dev_release,
1067         .groups =       scsi_sdev_attr_groups,
1068 };
1069
1070 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1071 {
1072         unsigned long flags;
1073         struct Scsi_Host *shost = sdev->host;
1074         struct scsi_target  *starget = sdev->sdev_target;
1075
1076         device_initialize(&sdev->sdev_gendev);
1077         sdev->sdev_gendev.bus = &scsi_bus_type;
1078         sdev->sdev_gendev.type = &scsi_dev_type;
1079         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1080                 sdev->host->host_no, sdev->channel, sdev->id,
1081                 sdev->lun);
1082         
1083         device_initialize(&sdev->sdev_dev);
1084         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1085         sdev->sdev_dev.class = &sdev_class;
1086         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1087                  "%d:%d:%d:%d", sdev->host->host_no,
1088                  sdev->channel, sdev->id, sdev->lun);
1089         sdev->scsi_level = starget->scsi_level;
1090         transport_setup_device(&sdev->sdev_gendev);
1091         spin_lock_irqsave(shost->host_lock, flags);
1092         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1093         list_add_tail(&sdev->siblings, &shost->__devices);
1094         spin_unlock_irqrestore(shost->host_lock, flags);
1095 }
1096
1097 int scsi_is_sdev_device(const struct device *dev)
1098 {
1099         return dev->type == &scsi_dev_type;
1100 }
1101 EXPORT_SYMBOL(scsi_is_sdev_device);
1102
1103 /* A blank transport template that is used in drivers that don't
1104  * yet implement Transport Attributes */
1105 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };