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/kmod.h>
20 #include <linux/ctype.h>
21 #include <linux/genhd.h>
22 #include <linux/blktrace_api.h>
41 #ifdef CONFIG_BLK_DEV_MD
42 extern void md_autodetect_dev(dev_t dev);
45 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
47 static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
49 * Probe partition formats with tables at disk address 0
50 * that also have an ADFS boot block at 0xdc0.
52 #ifdef CONFIG_ACORN_PARTITION_ICS
55 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
56 adfspart_check_POWERTEC,
58 #ifdef CONFIG_ACORN_PARTITION_EESOX
63 * Now move on to formats that only have partition info at
64 * disk address 0xdc0. Since these may also have stale
65 * PC/BIOS partition tables, they need to come before
68 #ifdef CONFIG_ACORN_PARTITION_CUMANA
69 adfspart_check_CUMANA,
71 #ifdef CONFIG_ACORN_PARTITION_ADFS
75 #ifdef CONFIG_EFI_PARTITION
76 efi_partition, /* this must come before msdos */
78 #ifdef CONFIG_SGI_PARTITION
81 #ifdef CONFIG_LDM_PARTITION
82 ldm_partition, /* this must come before msdos */
84 #ifdef CONFIG_MSDOS_PARTITION
87 #ifdef CONFIG_OSF_PARTITION
90 #ifdef CONFIG_SUN_PARTITION
93 #ifdef CONFIG_AMIGA_PARTITION
96 #ifdef CONFIG_ATARI_PARTITION
99 #ifdef CONFIG_MAC_PARTITION
102 #ifdef CONFIG_ULTRIX_PARTITION
105 #ifdef CONFIG_IBM_PARTITION
108 #ifdef CONFIG_KARMA_PARTITION
111 #ifdef CONFIG_SYSV68_PARTITION
118 * disk_name() is used by partition check code and the genhd driver.
119 * It formats the devicename of the indicated disk into
120 * the supplied buffer (of size at least 32), and returns
121 * a pointer to that same buffer (for convenience).
124 char *disk_name(struct gendisk *hd, int partno, char *buf)
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);
131 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
136 const char *bdevname(struct block_device *bdev, char *buf)
138 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
141 EXPORT_SYMBOL(bdevname);
144 * There's very little reason to use this, you should really
145 * have a struct block_device just about everywhere and use
146 * bdevname() instead.
148 const char *__bdevname(dev_t dev, char *buffer)
150 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
151 MAJOR(dev), MINOR(dev));
155 EXPORT_SYMBOL(__bdevname);
157 static struct parsed_partitions *
158 check_partition(struct gendisk *hd, struct block_device *bdev)
160 struct parsed_partitions *state;
163 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
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");
172 state->limit = disk_max_parts(hd);
174 while (!res && check_part[i]) {
175 memset(&state->parts, 0, sizeof(state->parts));
176 res = check_part[i++](state, bdev);
178 /* We have hit an I/O error which we don't report now.
179 * But record it, and let the others do their job.
189 /* The partition is unrecognized. So report I/O errors if there were any */
192 printk(" unknown partition table\n");
193 else if (warn_no_part)
194 printk(" unable to read partition table\n");
199 static ssize_t part_partition_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
202 struct hd_struct *p = dev_to_part(dev);
204 return sprintf(buf, "%d\n", p->partno);
207 static ssize_t part_start_show(struct device *dev,
208 struct device_attribute *attr, char *buf)
210 struct hd_struct *p = dev_to_part(dev);
212 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
215 ssize_t part_size_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
218 struct hd_struct *p = dev_to_part(dev);
219 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
222 ssize_t part_alignment_offset_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
225 struct hd_struct *p = dev_to_part(dev);
226 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
229 ssize_t part_stat_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
232 struct hd_struct *p = dev_to_part(dev);
235 cpu = part_stat_lock();
236 part_round_stats(cpu, p);
239 "%8lu %8lu %8llu %8u "
240 "%8lu %8lu %8llu %8u "
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])),
252 jiffies_to_msecs(part_stat_read(p, io_ticks)),
253 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
256 ssize_t part_inflight_show(struct device *dev,
257 struct device_attribute *attr, char *buf)
259 struct hd_struct *p = dev_to_part(dev);
261 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
264 #ifdef CONFIG_FAIL_MAKE_REQUEST
265 ssize_t part_fail_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
268 struct hd_struct *p = dev_to_part(dev);
270 return sprintf(buf, "%d\n", p->make_it_fail);
273 ssize_t part_fail_store(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
277 struct hd_struct *p = dev_to_part(dev);
280 if (count > 0 && sscanf(buf, "%d", &i) > 0)
281 p->make_it_fail = (i == 0) ? 0 : 1;
287 static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
288 static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
289 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
290 static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
291 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
292 static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
293 #ifdef CONFIG_FAIL_MAKE_REQUEST
294 static struct device_attribute dev_attr_fail =
295 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
298 static struct attribute *part_attrs[] = {
299 &dev_attr_partition.attr,
300 &dev_attr_start.attr,
302 &dev_attr_alignment_offset.attr,
304 &dev_attr_inflight.attr,
305 #ifdef CONFIG_FAIL_MAKE_REQUEST
311 static struct attribute_group part_attr_group = {
315 static const struct attribute_group *part_attr_groups[] = {
317 #ifdef CONFIG_BLK_DEV_IO_TRACE
318 &blk_trace_attr_group,
323 static void part_release(struct device *dev)
325 struct hd_struct *p = dev_to_part(dev);
330 struct device_type part_type = {
332 .groups = part_attr_groups,
333 .release = part_release,
336 static void delete_partition_rcu_cb(struct rcu_head *head)
338 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
340 part->start_sect = 0;
342 part_stat_set_all(part, 0);
343 put_device(part_to_dev(part));
346 void delete_partition(struct gendisk *disk, int partno)
348 struct disk_part_tbl *ptbl = disk->part_tbl;
349 struct hd_struct *part;
351 if (partno >= ptbl->len)
354 part = ptbl->part[partno];
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));
364 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
367 static ssize_t whole_disk_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
372 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
373 whole_disk_show, NULL);
375 struct hd_struct *add_partition(struct gendisk *disk, int partno,
376 sector_t start, sector_t len, int flags)
379 dev_t devt = MKDEV(0, 0);
380 struct device *ddev = disk_to_dev(disk);
382 struct disk_part_tbl *ptbl;
386 err = disk_expand_part_tbl(disk, partno);
389 ptbl = disk->part_tbl;
391 if (ptbl->part[partno])
392 return ERR_PTR(-EBUSY);
394 p = kzalloc(sizeof(*p), GFP_KERNEL);
396 return ERR_PTR(-EBUSY);
398 if (!init_part_stats(p)) {
402 pdev = part_to_dev(p);
404 p->start_sect = start;
405 p->alignment_offset = queue_sector_alignment_offset(disk->queue, start);
408 p->policy = get_disk_ro(disk);
410 dname = dev_name(ddev);
411 if (isdigit(dname[strlen(dname) - 1]))
412 dev_set_name(pdev, "%sp%d", dname, partno);
414 dev_set_name(pdev, "%s%d", dname, partno);
416 device_initialize(pdev);
417 pdev->class = &block_class;
418 pdev->type = &part_type;
421 err = blk_alloc_devt(p, &devt);
426 /* delay uevent until 'holders' subdir is created */
427 dev_set_uevent_suppress(pdev, 1);
428 err = device_add(pdev);
433 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
437 dev_set_uevent_suppress(pdev, 0);
438 if (flags & ADDPART_FLAG_WHOLEDISK) {
439 err = device_create_file(pdev, &dev_attr_whole_disk);
444 /* everything is up and running, commence */
445 INIT_RCU_HEAD(&p->rcu_head);
446 rcu_assign_pointer(ptbl->part[partno], p);
448 /* suppress uevent if the disk supresses it */
449 if (!dev_get_uevent_suppress(ddev))
450 kobject_uevent(&pdev->kobj, KOBJ_ADD);
460 kobject_put(p->holder_dir);
468 /* Not exported, helper to add_disk(). */
469 void register_disk(struct gendisk *disk)
471 struct device *ddev = disk_to_dev(disk);
472 struct block_device *bdev;
473 struct disk_part_iter piter;
474 struct hd_struct *part;
477 ddev->parent = disk->driverfs_dev;
479 dev_set_name(ddev, disk->disk_name);
481 /* delay uevents, until we scanned partition table */
482 dev_set_uevent_suppress(ddev, 1);
484 if (device_add(ddev))
486 #ifndef CONFIG_SYSFS_DEPRECATED
487 err = sysfs_create_link(block_depr, &ddev->kobj,
488 kobject_name(&ddev->kobj));
494 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
495 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
497 /* No minors to use for partitions */
498 if (!disk_partitionable(disk))
501 /* No such device (e.g., media were just removed) */
502 if (!get_capacity(disk))
505 bdev = bdget_disk(disk, 0);
509 bdev->bd_invalidated = 1;
510 err = blkdev_get(bdev, FMODE_READ);
513 blkdev_put(bdev, FMODE_READ);
516 /* announce disk after possible partitions are created */
517 dev_set_uevent_suppress(ddev, 0);
518 kobject_uevent(&ddev->kobj, KOBJ_ADD);
520 /* announce possible partitions */
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);
527 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
529 struct disk_part_iter piter;
530 struct hd_struct *part;
531 struct parsed_partitions *state;
534 if (bdev->bd_part_count)
536 res = invalidate_partition(disk, 0);
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);
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)))
551 if (IS_ERR(state)) /* I/O error reading the partition table */
554 /* tell userspace that the media / partition table may have changed */
555 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
557 /* Detect the highest partition number and preallocate
558 * disk->part_tbl. This is an optimization and not strictly
561 for (p = 1, highest = 0; p < state->limit; p++)
562 if (state->parts[p].size)
565 disk_expand_part_tbl(disk, highest);
568 for (p = 1; p < state->limit; p++) {
571 size = state->parts[p].size;
575 from = state->parts[p].from;
576 if (from >= get_capacity(disk)) {
578 "%s: p%d ignored, start %llu is behind the end of the disk\n",
579 disk->disk_name, p, (unsigned long long) from);
583 if (from + size > get_capacity(disk)) {
584 const struct block_device_operations *bdops = disk->fops;
585 unsigned long long capacity;
588 "%s: p%d size %llu exceeds device capacity, ",
589 disk->disk_name, p, (unsigned long long) size);
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;
604 * we can not ignore partitions of broken tables
605 * created by for example camera firmware, but
606 * we limit them to the end of the disk to avoid
607 * creating invalid block devices
609 printk(KERN_CONT "limited to end of disk\n");
610 size = get_capacity(disk) - from;
613 part = add_partition(disk, p, from, size,
614 state->parts[p].flags);
616 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
617 disk->disk_name, p, -PTR_ERR(part));
620 #ifdef CONFIG_BLK_DEV_MD
621 if (state->parts[p].flags & ADDPART_FLAG_RAID)
622 md_autodetect_dev(part_to_dev(part)->devt);
629 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
631 struct address_space *mapping = bdev->bd_inode->i_mapping;
634 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
640 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
642 page_cache_release(page);
648 EXPORT_SYMBOL(read_dev_sector);
650 void del_gendisk(struct gendisk *disk)
652 struct disk_part_iter piter;
653 struct hd_struct *part;
655 /* invalidate stuff */
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);
662 disk_part_iter_exit(&piter);
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;
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)));
678 device_del(disk_to_dev(disk));