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>
40 #ifdef CONFIG_BLK_DEV_MD
41 extern void md_autodetect_dev(dev_t dev);
44 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
46 static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
48 * Probe partition formats with tables at disk address 0
49 * that also have an ADFS boot block at 0xdc0.
51 #ifdef CONFIG_ACORN_PARTITION_ICS
54 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
55 adfspart_check_POWERTEC,
57 #ifdef CONFIG_ACORN_PARTITION_EESOX
62 * Now move on to formats that only have partition info at
63 * disk address 0xdc0. Since these may also have stale
64 * PC/BIOS partition tables, they need to come before
67 #ifdef CONFIG_ACORN_PARTITION_CUMANA
68 adfspart_check_CUMANA,
70 #ifdef CONFIG_ACORN_PARTITION_ADFS
74 #ifdef CONFIG_EFI_PARTITION
75 efi_partition, /* this must come before msdos */
77 #ifdef CONFIG_SGI_PARTITION
80 #ifdef CONFIG_LDM_PARTITION
81 ldm_partition, /* this must come before msdos */
83 #ifdef CONFIG_MSDOS_PARTITION
86 #ifdef CONFIG_OSF_PARTITION
89 #ifdef CONFIG_SUN_PARTITION
92 #ifdef CONFIG_AMIGA_PARTITION
95 #ifdef CONFIG_ATARI_PARTITION
98 #ifdef CONFIG_MAC_PARTITION
101 #ifdef CONFIG_ULTRIX_PARTITION
104 #ifdef CONFIG_IBM_PARTITION
107 #ifdef CONFIG_KARMA_PARTITION
110 #ifdef CONFIG_SYSV68_PARTITION
117 * disk_name() is used by partition check code and the genhd driver.
118 * It formats the devicename of the indicated disk into
119 * the supplied buffer (of size at least 32), and returns
120 * a pointer to that same buffer (for convenience).
123 char *disk_name(struct gendisk *hd, int partno, char *buf)
126 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
127 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
128 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
130 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
135 const char *bdevname(struct block_device *bdev, char *buf)
137 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
140 EXPORT_SYMBOL(bdevname);
143 * There's very little reason to use this, you should really
144 * have a struct block_device just about everywhere and use
145 * bdevname() instead.
147 const char *__bdevname(dev_t dev, char *buffer)
149 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
150 MAJOR(dev), MINOR(dev));
154 EXPORT_SYMBOL(__bdevname);
156 static struct parsed_partitions *
157 check_partition(struct gendisk *hd, struct block_device *bdev)
159 struct parsed_partitions *state;
162 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
166 disk_name(hd, 0, state->name);
167 printk(KERN_INFO " %s:", state->name);
168 if (isdigit(state->name[strlen(state->name)-1]))
169 sprintf(state->name, "p");
171 state->limit = disk_max_parts(hd);
173 while (!res && check_part[i]) {
174 memset(&state->parts, 0, sizeof(state->parts));
175 res = check_part[i++](state, bdev);
177 /* We have hit an I/O error which we don't report now.
178 * But record it, and let the others do their job.
188 /* The partition is unrecognized. So report I/O errors if there were any */
191 printk(" unknown partition table\n");
192 else if (warn_no_part)
193 printk(" unable to read partition table\n");
198 static ssize_t part_partition_show(struct device *dev,
199 struct device_attribute *attr, char *buf)
201 struct hd_struct *p = dev_to_part(dev);
203 return sprintf(buf, "%d\n", p->partno);
206 static ssize_t part_start_show(struct device *dev,
207 struct device_attribute *attr, char *buf)
209 struct hd_struct *p = dev_to_part(dev);
211 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
214 ssize_t part_size_show(struct device *dev,
215 struct device_attribute *attr, char *buf)
217 struct hd_struct *p = dev_to_part(dev);
218 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
221 ssize_t part_stat_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
224 struct hd_struct *p = dev_to_part(dev);
227 cpu = part_stat_lock();
228 part_round_stats(cpu, p);
231 "%8lu %8lu %8llu %8u "
232 "%8lu %8lu %8llu %8u "
235 part_stat_read(p, ios[READ]),
236 part_stat_read(p, merges[READ]),
237 (unsigned long long)part_stat_read(p, sectors[READ]),
238 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
239 part_stat_read(p, ios[WRITE]),
240 part_stat_read(p, merges[WRITE]),
241 (unsigned long long)part_stat_read(p, sectors[WRITE]),
242 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
244 jiffies_to_msecs(part_stat_read(p, io_ticks)),
245 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
248 #ifdef CONFIG_FAIL_MAKE_REQUEST
249 ssize_t part_fail_show(struct device *dev,
250 struct device_attribute *attr, char *buf)
252 struct hd_struct *p = dev_to_part(dev);
254 return sprintf(buf, "%d\n", p->make_it_fail);
257 ssize_t part_fail_store(struct device *dev,
258 struct device_attribute *attr,
259 const char *buf, size_t count)
261 struct hd_struct *p = dev_to_part(dev);
264 if (count > 0 && sscanf(buf, "%d", &i) > 0)
265 p->make_it_fail = (i == 0) ? 0 : 1;
271 #ifdef CONFIG_BLK_DEV_IO_TRACE
272 extern struct attribute_group blk_trace_attr_group;
275 static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
276 static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
277 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
278 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
279 #ifdef CONFIG_FAIL_MAKE_REQUEST
280 static struct device_attribute dev_attr_fail =
281 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
284 static struct attribute *part_attrs[] = {
285 &dev_attr_partition.attr,
286 &dev_attr_start.attr,
289 #ifdef CONFIG_FAIL_MAKE_REQUEST
295 static struct attribute_group part_attr_group = {
299 static struct attribute_group *part_attr_groups[] = {
301 #ifdef CONFIG_BLK_DEV_IO_TRACE
302 &blk_trace_attr_group,
307 static void part_release(struct device *dev)
309 struct hd_struct *p = dev_to_part(dev);
314 struct device_type part_type = {
316 .groups = part_attr_groups,
317 .release = part_release,
320 static void delete_partition_rcu_cb(struct rcu_head *head)
322 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
324 part->start_sect = 0;
326 part_stat_set_all(part, 0);
327 put_device(part_to_dev(part));
330 void delete_partition(struct gendisk *disk, int partno)
332 struct disk_part_tbl *ptbl = disk->part_tbl;
333 struct hd_struct *part;
335 if (partno >= ptbl->len)
338 part = ptbl->part[partno];
342 blk_free_devt(part_devt(part));
343 rcu_assign_pointer(ptbl->part[partno], NULL);
344 rcu_assign_pointer(ptbl->last_lookup, NULL);
345 kobject_put(part->holder_dir);
346 device_del(part_to_dev(part));
348 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
351 static ssize_t whole_disk_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
356 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
357 whole_disk_show, NULL);
359 struct hd_struct *add_partition(struct gendisk *disk, int partno,
360 sector_t start, sector_t len, int flags)
363 dev_t devt = MKDEV(0, 0);
364 struct device *ddev = disk_to_dev(disk);
366 struct disk_part_tbl *ptbl;
370 err = disk_expand_part_tbl(disk, partno);
373 ptbl = disk->part_tbl;
375 if (ptbl->part[partno])
376 return ERR_PTR(-EBUSY);
378 p = kzalloc(sizeof(*p), GFP_KERNEL);
380 return ERR_PTR(-EBUSY);
382 if (!init_part_stats(p)) {
386 pdev = part_to_dev(p);
388 p->start_sect = start;
391 p->policy = get_disk_ro(disk);
393 dname = dev_name(ddev);
394 if (isdigit(dname[strlen(dname) - 1]))
395 dev_set_name(pdev, "%sp%d", dname, partno);
397 dev_set_name(pdev, "%s%d", dname, partno);
399 device_initialize(pdev);
400 pdev->class = &block_class;
401 pdev->type = &part_type;
404 err = blk_alloc_devt(p, &devt);
409 /* delay uevent until 'holders' subdir is created */
410 pdev->uevent_suppress = 1;
411 err = device_add(pdev);
416 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
420 pdev->uevent_suppress = 0;
421 if (flags & ADDPART_FLAG_WHOLEDISK) {
422 err = device_create_file(pdev, &dev_attr_whole_disk);
427 /* everything is up and running, commence */
428 INIT_RCU_HEAD(&p->rcu_head);
429 rcu_assign_pointer(ptbl->part[partno], p);
431 /* suppress uevent if the disk supresses it */
432 if (!ddev->uevent_suppress)
433 kobject_uevent(&pdev->kobj, KOBJ_ADD);
443 kobject_put(p->holder_dir);
451 /* Not exported, helper to add_disk(). */
452 void register_disk(struct gendisk *disk)
454 struct device *ddev = disk_to_dev(disk);
455 struct block_device *bdev;
456 struct disk_part_iter piter;
457 struct hd_struct *part;
460 ddev->parent = disk->driverfs_dev;
462 dev_set_name(ddev, disk->disk_name);
464 /* delay uevents, until we scanned partition table */
465 ddev->uevent_suppress = 1;
467 if (device_add(ddev))
469 #ifndef CONFIG_SYSFS_DEPRECATED
470 err = sysfs_create_link(block_depr, &ddev->kobj,
471 kobject_name(&ddev->kobj));
477 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
478 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
480 /* No minors to use for partitions */
481 if (!disk_partitionable(disk))
484 /* No such device (e.g., media were just removed) */
485 if (!get_capacity(disk))
488 bdev = bdget_disk(disk, 0);
492 bdev->bd_invalidated = 1;
493 err = blkdev_get(bdev, FMODE_READ);
496 blkdev_put(bdev, FMODE_READ);
499 /* announce disk after possible partitions are created */
500 ddev->uevent_suppress = 0;
501 kobject_uevent(&ddev->kobj, KOBJ_ADD);
503 /* announce possible partitions */
504 disk_part_iter_init(&piter, disk, 0);
505 while ((part = disk_part_iter_next(&piter)))
506 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
507 disk_part_iter_exit(&piter);
510 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
512 struct disk_part_iter piter;
513 struct hd_struct *part;
514 struct parsed_partitions *state;
517 if (bdev->bd_part_count)
519 res = invalidate_partition(disk, 0);
523 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
524 while ((part = disk_part_iter_next(&piter)))
525 delete_partition(disk, part->partno);
526 disk_part_iter_exit(&piter);
528 if (disk->fops->revalidate_disk)
529 disk->fops->revalidate_disk(disk);
530 check_disk_size_change(disk, bdev);
531 bdev->bd_invalidated = 0;
532 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
534 if (IS_ERR(state)) /* I/O error reading the partition table */
537 /* tell userspace that the media / partition table may have changed */
538 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
540 /* Detect the highest partition number and preallocate
541 * disk->part_tbl. This is an optimization and not strictly
544 for (p = 1, highest = 0; p < state->limit; p++)
545 if (state->parts[p].size)
548 disk_expand_part_tbl(disk, highest);
551 for (p = 1; p < state->limit; p++) {
552 sector_t size = state->parts[p].size;
553 sector_t from = state->parts[p].from;
556 if (from >= get_capacity(disk)) {
558 "%s: p%d ignored, start %llu is behind the end of the disk\n",
559 disk->disk_name, p, (unsigned long long) from);
562 if (from + size > get_capacity(disk)) {
564 * we can not ignore partitions of broken tables
565 * created by for example camera firmware, but we
566 * limit them to the end of the disk to avoid
567 * creating invalid block devices
570 "%s: p%d size %llu limited to end of disk\n",
571 disk->disk_name, p, (unsigned long long) size);
572 size = get_capacity(disk) - from;
574 part = add_partition(disk, p, from, size,
575 state->parts[p].flags);
577 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
578 disk->disk_name, p, -PTR_ERR(part));
581 #ifdef CONFIG_BLK_DEV_MD
582 if (state->parts[p].flags & ADDPART_FLAG_RAID)
583 md_autodetect_dev(part_to_dev(part)->devt);
590 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
592 struct address_space *mapping = bdev->bd_inode->i_mapping;
595 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
601 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
603 page_cache_release(page);
609 EXPORT_SYMBOL(read_dev_sector);
611 void del_gendisk(struct gendisk *disk)
613 struct disk_part_iter piter;
614 struct hd_struct *part;
616 /* invalidate stuff */
617 disk_part_iter_init(&piter, disk,
618 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
619 while ((part = disk_part_iter_next(&piter))) {
620 invalidate_partition(disk, part->partno);
621 delete_partition(disk, part->partno);
623 disk_part_iter_exit(&piter);
625 invalidate_partition(disk, 0);
626 blk_free_devt(disk_to_dev(disk)->devt);
627 set_capacity(disk, 0);
628 disk->flags &= ~GENHD_FL_UP;
629 unlink_gendisk(disk);
630 part_stat_set_all(&disk->part0, 0);
631 disk->part0.stamp = 0;
633 kobject_put(disk->part0.holder_dir);
634 kobject_put(disk->slave_dir);
635 disk->driverfs_dev = NULL;
636 #ifndef CONFIG_SYSFS_DEPRECATED
637 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
639 device_del(disk_to_dev(disk));