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16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/fs.h>
19#include <linux/kmod.h>
20#include <linux/ctype.h>
21#include <linux/genhd.h>
22#include <linux/blktrace_api.h>
23
24#include "check.h"
25
26#include "acorn.h"
27#include "amiga.h"
28#include "atari.h"
29#include "ldm.h"
30#include "mac.h"
31#include "msdos.h"
32#include "osf.h"
33#include "sgi.h"
34#include "sun.h"
35#include "ibm.h"
36#include "ultrix.h"
37#include "efi.h"
38#include "karma.h"
39#include "sysv68.h"
40
41#ifdef CONFIG_BLK_DEV_MD
42extern void md_autodetect_dev(dev_t dev);
43#endif
44
45int warn_no_part = 1;
46
47static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
48
49
50
51
52#ifdef CONFIG_ACORN_PARTITION_ICS
53 adfspart_check_ICS,
54#endif
55#ifdef CONFIG_ACORN_PARTITION_POWERTEC
56 adfspart_check_POWERTEC,
57#endif
58#ifdef CONFIG_ACORN_PARTITION_EESOX
59 adfspart_check_EESOX,
60#endif
61
62
63
64
65
66
67
68#ifdef CONFIG_ACORN_PARTITION_CUMANA
69 adfspart_check_CUMANA,
70#endif
71#ifdef CONFIG_ACORN_PARTITION_ADFS
72 adfspart_check_ADFS,
73#endif
74
75#ifdef CONFIG_EFI_PARTITION
76 efi_partition,
77#endif
78#ifdef CONFIG_SGI_PARTITION
79 sgi_partition,
80#endif
81#ifdef CONFIG_LDM_PARTITION
82 ldm_partition,
83#endif
84#ifdef CONFIG_MSDOS_PARTITION
85 msdos_partition,
86#endif
87#ifdef CONFIG_OSF_PARTITION
88 osf_partition,
89#endif
90#ifdef CONFIG_SUN_PARTITION
91 sun_partition,
92#endif
93#ifdef CONFIG_AMIGA_PARTITION
94 amiga_partition,
95#endif
96#ifdef CONFIG_ATARI_PARTITION
97 atari_partition,
98#endif
99#ifdef CONFIG_MAC_PARTITION
100 mac_partition,
101#endif
102#ifdef CONFIG_ULTRIX_PARTITION
103 ultrix_partition,
104#endif
105#ifdef CONFIG_IBM_PARTITION
106 ibm_partition,
107#endif
108#ifdef CONFIG_KARMA_PARTITION
109 karma_partition,
110#endif
111#ifdef CONFIG_SYSV68_PARTITION
112 sysv68_partition,
113#endif
114 NULL
115};
116
117
118
119
120
121
122
123
124char *disk_name(struct gendisk *hd, int partno, char *buf)
125{
126 if (!partno)
127 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
128 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
129 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
130 else
131 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
132
133 return buf;
134}
135
136const char *bdevname(struct block_device *bdev, char *buf)
137{
138 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
139}
140
141EXPORT_SYMBOL(bdevname);
142
143
144
145
146
147
148const char *__bdevname(dev_t dev, char *buffer)
149{
150 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
151 MAJOR(dev), MINOR(dev));
152 return buffer;
153}
154
155EXPORT_SYMBOL(__bdevname);
156
157static struct parsed_partitions *
158check_partition(struct gendisk *hd, struct block_device *bdev)
159{
160 struct parsed_partitions *state;
161 int i, res, err;
162
163 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
164 if (!state)
165 return NULL;
166
167 disk_name(hd, 0, state->name);
168 printk(KERN_INFO " %s:", state->name);
169 if (isdigit(state->name[strlen(state->name)-1]))
170 sprintf(state->name, "p");
171
172 state->limit = disk_max_parts(hd);
173 i = res = err = 0;
174 while (!res && check_part[i]) {
175 memset(&state->parts, 0, sizeof(state->parts));
176 res = check_part[i++](state, bdev);
177 if (res < 0) {
178
179
180
181 err = res;
182 res = 0;
183 }
184
185 }
186 if (res > 0)
187 return state;
188 if (err)
189
190 res = err;
191 if (!res)
192 printk(" unknown partition table\n");
193 else if (warn_no_part)
194 printk(" unable to read partition table\n");
195 kfree(state);
196 return ERR_PTR(res);
197}
198
199static ssize_t part_partition_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 struct hd_struct *p = dev_to_part(dev);
203
204 return sprintf(buf, "%d\n", p->partno);
205}
206
207static ssize_t part_start_show(struct device *dev,
208 struct device_attribute *attr, char *buf)
209{
210 struct hd_struct *p = dev_to_part(dev);
211
212 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
213}
214
215ssize_t part_size_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
217{
218 struct hd_struct *p = dev_to_part(dev);
219 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
220}
221
222ssize_t part_alignment_offset_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
224{
225 struct hd_struct *p = dev_to_part(dev);
226 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
227}
228
229ssize_t part_stat_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
231{
232 struct hd_struct *p = dev_to_part(dev);
233 int cpu;
234
235 cpu = part_stat_lock();
236 part_round_stats(cpu, p);
237 part_stat_unlock();
238 return sprintf(buf,
239 "%8lu %8lu %8llu %8u "
240 "%8lu %8lu %8llu %8u "
241 "%8u %8u %8u"
242 "\n",
243 part_stat_read(p, ios[READ]),
244 part_stat_read(p, merges[READ]),
245 (unsigned long long)part_stat_read(p, sectors[READ]),
246 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
247 part_stat_read(p, ios[WRITE]),
248 part_stat_read(p, merges[WRITE]),
249 (unsigned long long)part_stat_read(p, sectors[WRITE]),
250 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
251 part_in_flight(p),
252 jiffies_to_msecs(part_stat_read(p, io_ticks)),
253 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
254}
255
256ssize_t part_inflight_show(struct device *dev,
257 struct device_attribute *attr, char *buf)
258{
259 struct hd_struct *p = dev_to_part(dev);
260
261 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
262}
263
264#ifdef CONFIG_FAIL_MAKE_REQUEST
265ssize_t part_fail_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
267{
268 struct hd_struct *p = dev_to_part(dev);
269
270 return sprintf(buf, "%d\n", p->make_it_fail);
271}
272
273ssize_t part_fail_store(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
276{
277 struct hd_struct *p = dev_to_part(dev);
278 int i;
279
280 if (count > 0 && sscanf(buf, "%d", &i) > 0)
281 p->make_it_fail = (i == 0) ? 0 : 1;
282
283 return count;
284}
285#endif
286
287static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
288static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
289static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
290static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
291static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
292static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
293#ifdef CONFIG_FAIL_MAKE_REQUEST
294static struct device_attribute dev_attr_fail =
295 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
296#endif
297
298static struct attribute *part_attrs[] = {
299 &dev_attr_partition.attr,
300 &dev_attr_start.attr,
301 &dev_attr_size.attr,
302 &dev_attr_alignment_offset.attr,
303 &dev_attr_stat.attr,
304 &dev_attr_inflight.attr,
305#ifdef CONFIG_FAIL_MAKE_REQUEST
306 &dev_attr_fail.attr,
307#endif
308 NULL
309};
310
311static struct attribute_group part_attr_group = {
312 .attrs = part_attrs,
313};
314
315static const struct attribute_group *part_attr_groups[] = {
316 &part_attr_group,
317#ifdef CONFIG_BLK_DEV_IO_TRACE
318 &blk_trace_attr_group,
319#endif
320 NULL
321};
322
323static void part_release(struct device *dev)
324{
325 struct hd_struct *p = dev_to_part(dev);
326 free_part_stats(p);
327 kfree(p);
328}
329
330struct device_type part_type = {
331 .name = "partition",
332 .groups = part_attr_groups,
333 .release = part_release,
334};
335
336static void delete_partition_rcu_cb(struct rcu_head *head)
337{
338 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
339
340 part->start_sect = 0;
341 part->nr_sects = 0;
342 part_stat_set_all(part, 0);
343 put_device(part_to_dev(part));
344}
345
346void delete_partition(struct gendisk *disk, int partno)
347{
348 struct disk_part_tbl *ptbl = disk->part_tbl;
349 struct hd_struct *part;
350
351 if (partno >= ptbl->len)
352 return;
353
354 part = ptbl->part[partno];
355 if (!part)
356 return;
357
358 blk_free_devt(part_devt(part));
359 rcu_assign_pointer(ptbl->part[partno], NULL);
360 rcu_assign_pointer(ptbl->last_lookup, NULL);
361 kobject_put(part->holder_dir);
362 device_del(part_to_dev(part));
363
364 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
365}
366
367static ssize_t whole_disk_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
369{
370 return 0;
371}
372static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
373 whole_disk_show, NULL);
374
375struct hd_struct *add_partition(struct gendisk *disk, int partno,
376 sector_t start, sector_t len, int flags)
377{
378 struct hd_struct *p;
379 dev_t devt = MKDEV(0, 0);
380 struct device *ddev = disk_to_dev(disk);
381 struct device *pdev;
382 struct disk_part_tbl *ptbl;
383 const char *dname;
384 int err;
385
386 err = disk_expand_part_tbl(disk, partno);
387 if (err)
388 return ERR_PTR(err);
389 ptbl = disk->part_tbl;
390
391 if (ptbl->part[partno])
392 return ERR_PTR(-EBUSY);
393
394 p = kzalloc(sizeof(*p), GFP_KERNEL);
395 if (!p)
396 return ERR_PTR(-EBUSY);
397
398 if (!init_part_stats(p)) {
399 err = -ENOMEM;
400 goto out_free;
401 }
402 pdev = part_to_dev(p);
403
404 p->start_sect = start;
405 p->alignment_offset = queue_sector_alignment_offset(disk->queue, start);
406 p->nr_sects = len;
407 p->partno = partno;
408 p->policy = get_disk_ro(disk);
409
410 dname = dev_name(ddev);
411 if (isdigit(dname[strlen(dname) - 1]))
412 dev_set_name(pdev, "%sp%d", dname, partno);
413 else
414 dev_set_name(pdev, "%s%d", dname, partno);
415
416 device_initialize(pdev);
417 pdev->class = &block_class;
418 pdev->type = &part_type;
419 pdev->parent = ddev;
420
421 err = blk_alloc_devt(p, &devt);
422 if (err)
423 goto out_free_stats;
424 pdev->devt = devt;
425
426
427 dev_set_uevent_suppress(pdev, 1);
428 err = device_add(pdev);
429 if (err)
430 goto out_put;
431
432 err = -ENOMEM;
433 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
434 if (!p->holder_dir)
435 goto out_del;
436
437 dev_set_uevent_suppress(pdev, 0);
438 if (flags & ADDPART_FLAG_WHOLEDISK) {
439 err = device_create_file(pdev, &dev_attr_whole_disk);
440 if (err)
441 goto out_del;
442 }
443
444
445 INIT_RCU_HEAD(&p->rcu_head);
446 rcu_assign_pointer(ptbl->part[partno], p);
447
448
449 if (!dev_get_uevent_suppress(ddev))
450 kobject_uevent(&pdev->kobj, KOBJ_ADD);
451
452 return p;
453
454out_free_stats:
455 free_part_stats(p);
456out_free:
457 kfree(p);
458 return ERR_PTR(err);
459out_del:
460 kobject_put(p->holder_dir);
461 device_del(pdev);
462out_put:
463 put_device(pdev);
464 blk_free_devt(devt);
465 return ERR_PTR(err);
466}
467
468
469void register_disk(struct gendisk *disk)
470{
471 struct device *ddev = disk_to_dev(disk);
472 struct block_device *bdev;
473 struct disk_part_iter piter;
474 struct hd_struct *part;
475 int err;
476
477 ddev->parent = disk->driverfs_dev;
478
479 dev_set_name(ddev, disk->disk_name);
480
481
482 dev_set_uevent_suppress(ddev, 1);
483
484 if (device_add(ddev))
485 return;
486#ifndef CONFIG_SYSFS_DEPRECATED
487 err = sysfs_create_link(block_depr, &ddev->kobj,
488 kobject_name(&ddev->kobj));
489 if (err) {
490 device_del(ddev);
491 return;
492 }
493#endif
494 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
495 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
496
497
498 if (!disk_partitionable(disk))
499 goto exit;
500
501
502 if (!get_capacity(disk))
503 goto exit;
504
505 bdev = bdget_disk(disk, 0);
506 if (!bdev)
507 goto exit;
508
509 bdev->bd_invalidated = 1;
510 err = blkdev_get(bdev, FMODE_READ);
511 if (err < 0)
512 goto exit;
513 blkdev_put(bdev, FMODE_READ);
514
515exit:
516
517 dev_set_uevent_suppress(ddev, 0);
518 kobject_uevent(&ddev->kobj, KOBJ_ADD);
519
520
521 disk_part_iter_init(&piter, disk, 0);
522 while ((part = disk_part_iter_next(&piter)))
523 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
524 disk_part_iter_exit(&piter);
525}
526
527int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
528{
529 struct disk_part_iter piter;
530 struct hd_struct *part;
531 struct parsed_partitions *state;
532 int p, highest, res;
533
534 if (bdev->bd_part_count)
535 return -EBUSY;
536 res = invalidate_partition(disk, 0);
537 if (res)
538 return res;
539
540 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
541 while ((part = disk_part_iter_next(&piter)))
542 delete_partition(disk, part->partno);
543 disk_part_iter_exit(&piter);
544
545 if (disk->fops->revalidate_disk)
546 disk->fops->revalidate_disk(disk);
547 check_disk_size_change(disk, bdev);
548 bdev->bd_invalidated = 0;
549 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
550 return 0;
551 if (IS_ERR(state))
552 return -EIO;
553
554
555 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
556
557
558
559
560
561 for (p = 1, highest = 0; p < state->limit; p++)
562 if (state->parts[p].size)
563 highest = p;
564
565 disk_expand_part_tbl(disk, highest);
566
567
568 for (p = 1; p < state->limit; p++) {
569 sector_t size, from;
570try_scan:
571 size = state->parts[p].size;
572 if (!size)
573 continue;
574
575 from = state->parts[p].from;
576 if (from >= get_capacity(disk)) {
577 printk(KERN_WARNING
578 "%s: p%d ignored, start %llu is behind the end of the disk\n",
579 disk->disk_name, p, (unsigned long long) from);
580 continue;
581 }
582
583 if (from + size > get_capacity(disk)) {
584 const struct block_device_operations *bdops = disk->fops;
585 unsigned long long capacity;
586
587 printk(KERN_WARNING
588 "%s: p%d size %llu exceeds device capacity, ",
589 disk->disk_name, p, (unsigned long long) size);
590
591 if (bdops->set_capacity &&
592 (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {
593 printk(KERN_CONT "enabling native capacity\n");
594 capacity = bdops->set_capacity(disk, ~0ULL);
595 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
596 if (capacity > get_capacity(disk)) {
597 set_capacity(disk, capacity);
598 check_disk_size_change(disk, bdev);
599 bdev->bd_invalidated = 0;
600 }
601 goto try_scan;
602 } else {
603
604
605
606
607
608
609 printk(KERN_CONT "limited to end of disk\n");
610 size = get_capacity(disk) - from;
611 }
612 }
613 part = add_partition(disk, p, from, size,
614 state->parts[p].flags);
615 if (IS_ERR(part)) {
616 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
617 disk->disk_name, p, -PTR_ERR(part));
618 continue;
619 }
620#ifdef CONFIG_BLK_DEV_MD
621 if (state->parts[p].flags & ADDPART_FLAG_RAID)
622 md_autodetect_dev(part_to_dev(part)->devt);
623#endif
624 }
625 kfree(state);
626 return 0;
627}
628
629unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
630{
631 struct address_space *mapping = bdev->bd_inode->i_mapping;
632 struct page *page;
633
634 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
635 NULL);
636 if (!IS_ERR(page)) {
637 if (PageError(page))
638 goto fail;
639 p->v = page;
640 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
641fail:
642 page_cache_release(page);
643 }
644 p->v = NULL;
645 return NULL;
646}
647
648EXPORT_SYMBOL(read_dev_sector);
649
650void del_gendisk(struct gendisk *disk)
651{
652 struct disk_part_iter piter;
653 struct hd_struct *part;
654
655
656 disk_part_iter_init(&piter, disk,
657 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
658 while ((part = disk_part_iter_next(&piter))) {
659 invalidate_partition(disk, part->partno);
660 delete_partition(disk, part->partno);
661 }
662 disk_part_iter_exit(&piter);
663
664 invalidate_partition(disk, 0);
665 blk_free_devt(disk_to_dev(disk)->devt);
666 set_capacity(disk, 0);
667 disk->flags &= ~GENHD_FL_UP;
668 unlink_gendisk(disk);
669 part_stat_set_all(&disk->part0, 0);
670 disk->part0.stamp = 0;
671
672 kobject_put(disk->part0.holder_dir);
673 kobject_put(disk->slave_dir);
674 disk->driverfs_dev = NULL;
675#ifndef CONFIG_SYSFS_DEPRECATED
676 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
677#endif
678 device_del(disk_to_dev(disk));
679}
680
