2 * fs/partitions/check.c
4 * Code extracted from drivers/block/genhd.c
5 * Copyright (C) 1991-1998 Linus Torvalds
6 * Re-organised Feb 1998 Russell King
8 * We now have independent partition support from the
9 * block drivers, which allows all the partition code to
10 * be grouped in one location, and it to be mostly self
13 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
16 #include <linux/init.h>
17 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/kmod.h>
21 #include <linux/ctype.h>
22 #include <linux/genhd.h>
23 #include <linux/blktrace_api.h>
43 #ifdef CONFIG_BLK_DEV_MD
44 extern void md_autodetect_dev(dev_t dev);
47 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
49 static int (*check_part[])(struct parsed_partitions *) = {
50 #ifdef CONFIG_CMDLINE_PARTITION
54 * Probe partition formats with tables at disk address 0
55 * that also have an ADFS boot block at 0xdc0.
57 #ifdef CONFIG_ACORN_PARTITION_ICS
60 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
61 adfspart_check_POWERTEC,
63 #ifdef CONFIG_ACORN_PARTITION_EESOX
68 * Now move on to formats that only have partition info at
69 * disk address 0xdc0. Since these may also have stale
70 * PC/BIOS partition tables, they need to come before
73 #ifdef CONFIG_ACORN_PARTITION_CUMANA
74 adfspart_check_CUMANA,
76 #ifdef CONFIG_ACORN_PARTITION_ADFS
80 #ifdef CONFIG_EFI_PARTITION
81 efi_partition, /* this must come before msdos */
83 #ifdef CONFIG_SGI_PARTITION
86 #ifdef CONFIG_LDM_PARTITION
87 ldm_partition, /* this must come before msdos */
89 #ifdef CONFIG_MSDOS_PARTITION
92 #ifdef CONFIG_OSF_PARTITION
95 #ifdef CONFIG_SUN_PARTITION
98 #ifdef CONFIG_AMIGA_PARTITION
101 #ifdef CONFIG_ATARI_PARTITION
104 #ifdef CONFIG_MAC_PARTITION
107 #ifdef CONFIG_ULTRIX_PARTITION
110 #ifdef CONFIG_IBM_PARTITION
113 #ifdef CONFIG_KARMA_PARTITION
116 #ifdef CONFIG_SYSV68_PARTITION
123 * disk_name() is used by partition check code and the genhd driver.
124 * It formats the devicename of the indicated disk into
125 * the supplied buffer (of size at least 32), and returns
126 * a pointer to that same buffer (for convenience).
129 char *disk_name(struct gendisk *hd, int partno, char *buf)
132 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
133 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
134 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
136 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
141 const char *bdevname(struct block_device *bdev, char *buf)
143 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
146 EXPORT_SYMBOL(bdevname);
149 * There's very little reason to use this, you should really
150 * have a struct block_device just about everywhere and use
151 * bdevname() instead.
153 const char *__bdevname(dev_t dev, char *buffer)
155 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
156 MAJOR(dev), MINOR(dev));
160 EXPORT_SYMBOL(__bdevname);
162 static struct parsed_partitions *
163 check_partition(struct gendisk *hd, struct block_device *bdev)
165 struct parsed_partitions *state;
168 state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
171 state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
172 if (!state->pp_buf) {
176 state->pp_buf[0] = '\0';
179 disk_name(hd, 0, state->name);
180 snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
181 if (isdigit(state->name[strlen(state->name)-1]))
182 sprintf(state->name, "p");
184 state->limit = disk_max_parts(hd);
186 while (!res && check_part[i]) {
187 memset(&state->parts, 0, sizeof(state->parts));
188 res = check_part[i++](state);
190 /* We have hit an I/O error which we don't report now.
191 * But record it, and let the others do their job.
199 printk(KERN_INFO "%s", state->pp_buf);
201 free_page((unsigned long)state->pp_buf);
204 if (state->access_beyond_eod)
207 /* The partition is unrecognized. So report I/O errors if there were any */
210 strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
211 else if (warn_no_part)
212 strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
214 printk(KERN_INFO "%s", state->pp_buf);
216 free_page((unsigned long)state->pp_buf);
221 static ssize_t part_partition_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
224 struct hd_struct *p = dev_to_part(dev);
226 return sprintf(buf, "%d\n", p->partno);
229 static ssize_t part_start_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
232 struct hd_struct *p = dev_to_part(dev);
234 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
237 ssize_t part_size_show(struct device *dev,
238 struct device_attribute *attr, char *buf)
240 struct hd_struct *p = dev_to_part(dev);
241 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
244 ssize_t part_alignment_offset_show(struct device *dev,
245 struct device_attribute *attr, char *buf)
247 struct hd_struct *p = dev_to_part(dev);
248 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
251 ssize_t part_discard_alignment_show(struct device *dev,
252 struct device_attribute *attr, char *buf)
254 struct hd_struct *p = dev_to_part(dev);
255 return sprintf(buf, "%u\n", p->discard_alignment);
258 ssize_t part_stat_show(struct device *dev,
259 struct device_attribute *attr, char *buf)
261 struct hd_struct *p = dev_to_part(dev);
264 cpu = part_stat_lock();
265 part_round_stats(cpu, p);
268 "%8lu %8lu %8llu %8u "
269 "%8lu %8lu %8llu %8u "
272 part_stat_read(p, ios[READ]),
273 part_stat_read(p, merges[READ]),
274 (unsigned long long)part_stat_read(p, sectors[READ]),
275 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
276 part_stat_read(p, ios[WRITE]),
277 part_stat_read(p, merges[WRITE]),
278 (unsigned long long)part_stat_read(p, sectors[WRITE]),
279 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
281 jiffies_to_msecs(part_stat_read(p, io_ticks)),
282 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
285 ssize_t part_inflight_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
288 struct hd_struct *p = dev_to_part(dev);
290 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
293 ssize_t part_partition_name_show(struct device *dev,
294 struct device_attribute *attr, char *buf)
296 struct hd_struct *p = dev_to_part(dev);
297 return sprintf(buf, "%s\n", p->partition_name);
300 #ifdef CONFIG_FAIL_MAKE_REQUEST
301 ssize_t part_fail_show(struct device *dev,
302 struct device_attribute *attr, char *buf)
304 struct hd_struct *p = dev_to_part(dev);
306 return sprintf(buf, "%d\n", p->make_it_fail);
309 ssize_t part_fail_store(struct device *dev,
310 struct device_attribute *attr,
311 const char *buf, size_t count)
313 struct hd_struct *p = dev_to_part(dev);
316 if (count > 0 && sscanf(buf, "%d", &i) > 0)
317 p->make_it_fail = (i == 0) ? 0 : 1;
323 static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
324 static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
325 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
326 static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
327 static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
329 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
330 static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
331 static DEVICE_ATTR(partition_name, S_IRUGO, part_partition_name_show, NULL);
333 #ifdef CONFIG_FAIL_MAKE_REQUEST
334 static struct device_attribute dev_attr_fail =
335 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
338 static struct attribute *part_attrs[] = {
339 &dev_attr_partition.attr,
340 &dev_attr_start.attr,
342 &dev_attr_alignment_offset.attr,
343 &dev_attr_discard_alignment.attr,
345 &dev_attr_inflight.attr,
346 &dev_attr_partition_name.attr,
347 #ifdef CONFIG_FAIL_MAKE_REQUEST
353 static struct attribute_group part_attr_group = {
357 static const struct attribute_group *part_attr_groups[] = {
359 #ifdef CONFIG_BLK_DEV_IO_TRACE
360 &blk_trace_attr_group,
365 static void part_release(struct device *dev)
367 struct hd_struct *p = dev_to_part(dev);
372 static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
374 struct hd_struct *part = dev_to_part(dev);
376 add_uevent_var(env, "PARTN=%u", part->partno);
377 if (part->partition_name)
378 add_uevent_var(env, "PARTNAME=%s", part->partition_name);
382 struct device_type part_type = {
384 .groups = part_attr_groups,
385 .release = part_release,
386 .uevent = part_uevent,
389 static void delete_partition_rcu_cb(struct rcu_head *head)
391 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
393 part->start_sect = 0;
395 part_stat_set_all(part, 0);
396 put_device(part_to_dev(part));
399 void delete_partition(struct gendisk *disk, int partno)
401 struct disk_part_tbl *ptbl = disk->part_tbl;
402 struct hd_struct *part;
404 if (partno >= ptbl->len)
407 part = ptbl->part[partno];
411 blk_free_devt(part_devt(part));
412 rcu_assign_pointer(ptbl->part[partno], NULL);
413 rcu_assign_pointer(ptbl->last_lookup, NULL);
414 kobject_put(part->holder_dir);
415 device_del(part_to_dev(part));
417 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
420 static ssize_t whole_disk_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
425 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
426 whole_disk_show, NULL);
428 static void name_partition(struct hd_struct *p, const char *name)
430 strlcpy(p->partition_name, name, GENHD_PART_NAME_SIZE);
433 struct hd_struct *add_partition(struct gendisk *disk, int partno,
434 sector_t start, sector_t len, int flags)
437 dev_t devt = MKDEV(0, 0);
438 struct device *ddev = disk_to_dev(disk);
440 struct disk_part_tbl *ptbl;
444 err = disk_expand_part_tbl(disk, partno);
447 ptbl = disk->part_tbl;
449 if (ptbl->part[partno])
450 return ERR_PTR(-EBUSY);
452 p = kzalloc(sizeof(*p), GFP_KERNEL);
454 return ERR_PTR(-EBUSY);
456 if (!init_part_stats(p)) {
460 pdev = part_to_dev(p);
462 p->start_sect = start;
463 p->alignment_offset =
464 queue_limit_alignment_offset(&disk->queue->limits, start);
465 p->discard_alignment =
466 queue_limit_discard_alignment(&disk->queue->limits, start);
469 p->policy = get_disk_ro(disk);
471 dname = dev_name(ddev);
472 if (isdigit(dname[strlen(dname) - 1]))
473 dev_set_name(pdev, "%sp%d", dname, partno);
475 dev_set_name(pdev, "%s%d", dname, partno);
477 device_initialize(pdev);
478 pdev->class = &block_class;
479 pdev->type = &part_type;
482 err = blk_alloc_devt(p, &devt);
487 /* delay uevent until 'holders' subdir is created */
488 dev_set_uevent_suppress(pdev, 1);
489 err = device_add(pdev);
494 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
498 dev_set_uevent_suppress(pdev, 0);
499 if (flags & ADDPART_FLAG_WHOLEDISK) {
500 err = device_create_file(pdev, &dev_attr_whole_disk);
505 /* everything is up and running, commence */
506 rcu_assign_pointer(ptbl->part[partno], p);
508 /* suppress uevent if the disk supresses it */
509 if (!dev_get_uevent_suppress(ddev))
510 kobject_uevent(&pdev->kobj, KOBJ_ADD);
520 kobject_put(p->holder_dir);
528 /* Not exported, helper to add_disk(). */
529 void register_disk(struct gendisk *disk)
531 struct device *ddev = disk_to_dev(disk);
532 struct block_device *bdev;
533 struct disk_part_iter piter;
534 struct hd_struct *part;
537 ddev->parent = disk->driverfs_dev;
539 dev_set_name(ddev, disk->disk_name);
541 /* delay uevents, until we scanned partition table */
542 dev_set_uevent_suppress(ddev, 1);
544 if (device_add(ddev))
546 #ifndef CONFIG_SYSFS_DEPRECATED
547 err = sysfs_create_link(block_depr, &ddev->kobj,
548 kobject_name(&ddev->kobj));
554 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
555 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
557 /* No minors to use for partitions */
558 if (!disk_partitionable(disk))
561 /* No such device (e.g., media were just removed) */
562 if (!get_capacity(disk))
565 bdev = bdget_disk(disk, 0);
569 bdev->bd_invalidated = 1;
570 err = blkdev_get(bdev, FMODE_READ);
573 blkdev_put(bdev, FMODE_READ);
576 /* announce disk after possible partitions are created */
577 dev_set_uevent_suppress(ddev, 0);
578 kobject_uevent(&ddev->kobj, KOBJ_ADD);
580 /* announce possible partitions */
581 disk_part_iter_init(&piter, disk, 0);
582 while ((part = disk_part_iter_next(&piter)))
583 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
584 disk_part_iter_exit(&piter);
587 static bool disk_unlock_native_capacity(struct gendisk *disk)
589 const struct block_device_operations *bdops = disk->fops;
591 if (bdops->unlock_native_capacity &&
592 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
593 printk(KERN_CONT "enabling native capacity\n");
594 bdops->unlock_native_capacity(disk);
595 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
598 printk(KERN_CONT "truncated\n");
603 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
605 struct parsed_partitions *state = NULL;
606 struct disk_part_iter piter;
607 struct hd_struct *part;
610 if (state && !IS_ERR(state)) {
615 if (bdev->bd_part_count)
617 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
618 if(179 == MAJOR(bdev->bd_dev))
620 printk("%s..%d.. The sdcard partition have been using.So device busy! ====xbw===\n",__FUNCTION__, __LINE__);
626 res = invalidate_partition(disk, 0);
630 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
631 while ((part = disk_part_iter_next(&piter)))
632 delete_partition(disk, part->partno);
633 disk_part_iter_exit(&piter);
635 if (disk->fops->revalidate_disk)
636 disk->fops->revalidate_disk(disk);
637 check_disk_size_change(disk, bdev);
638 bdev->bd_invalidated = 0;
639 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
641 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
642 if(179 == MAJOR(bdev->bd_dev))
644 printk("%s..%d... ==== check partition fail. partitionAddr=%x ====xbw===\n",__FUNCTION__, __LINE__, state);
651 * I/O error reading the partition table. If any
652 * partition code tried to read beyond EOD, retry
653 * after unlocking native capacity.
655 if (PTR_ERR(state) == -ENOSPC) {
656 printk(KERN_WARNING "%s: partition table beyond EOD, ",
658 if (disk_unlock_native_capacity(disk))
664 * If any partition code tried to read beyond EOD, try
665 * unlocking native capacity even if partition table is
666 * sucessfully read as we could be missing some partitions.
668 if (state->access_beyond_eod) {
670 "%s: partition table partially beyond EOD, ",
672 if (disk_unlock_native_capacity(disk))
676 /* tell userspace that the media / partition table may have changed */
677 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
679 /* Detect the highest partition number and preallocate
680 * disk->part_tbl. This is an optimization and not strictly
683 for (p = 1, highest = 0; p < state->limit; p++)
684 if (state->parts[p].size)
687 disk_expand_part_tbl(disk, highest);
690 for (p = 1; p < state->limit; p++) {
693 size = state->parts[p].size;
697 from = state->parts[p].from;
698 if (from >= get_capacity(disk)) {
700 "%s: p%d start %llu is beyond EOD, ",
701 disk->disk_name, p, (unsigned long long) from);
702 if (disk_unlock_native_capacity(disk))
707 if (from + size > get_capacity(disk)) {
709 "%s: p%d size %llu extends beyond EOD, ",
710 disk->disk_name, p, (unsigned long long) size);
712 if (disk_unlock_native_capacity(disk)) {
713 /* free state and restart */
717 * we can not ignore partitions of broken tables
718 * created by for example camera firmware, but
719 * we limit them to the end of the disk to avoid
720 * creating invalid block devices
722 size = get_capacity(disk) - from;
725 part = add_partition(disk, p, from, size,
726 state->parts[p].flags);
728 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
729 disk->disk_name, p, -PTR_ERR(part));
732 name_partition(part, state->parts[p].name);
733 #ifdef CONFIG_BLK_DEV_MD
734 if (state->parts[p].flags & ADDPART_FLAG_RAID)
735 md_autodetect_dev(part_to_dev(part)->devt);
742 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
744 struct address_space *mapping = bdev->bd_inode->i_mapping;
747 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
753 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
755 page_cache_release(page);
761 EXPORT_SYMBOL(read_dev_sector);
763 void del_gendisk(struct gendisk *disk)
765 struct disk_part_iter piter;
766 struct hd_struct *part;
768 /* invalidate stuff */
769 disk_part_iter_init(&piter, disk,
770 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
771 while ((part = disk_part_iter_next(&piter))) {
772 invalidate_partition(disk, part->partno);
773 delete_partition(disk, part->partno);
775 disk_part_iter_exit(&piter);
777 invalidate_partition(disk, 0);
778 blk_free_devt(disk_to_dev(disk)->devt);
779 set_capacity(disk, 0);
780 disk->flags &= ~GENHD_FL_UP;
781 unlink_gendisk(disk);
782 part_stat_set_all(&disk->part0, 0);
783 disk->part0.stamp = 0;
785 kobject_put(disk->part0.holder_dir);
786 kobject_put(disk->slave_dir);
787 disk->driverfs_dev = NULL;
788 #ifndef CONFIG_SYSFS_DEPRECATED
789 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
791 device_del(disk_to_dev(disk));