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)
140 partno = bdev->bd_part->partno;
142 return disk_name(bdev->bd_disk, partno, buf);
145 EXPORT_SYMBOL(bdevname);
148 * There's very little reason to use this, you should really
149 * have a struct block_device just about everywhere and use
150 * bdevname() instead.
152 const char *__bdevname(dev_t dev, char *buffer)
154 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
155 MAJOR(dev), MINOR(dev));
159 EXPORT_SYMBOL(__bdevname);
161 static struct parsed_partitions *
162 check_partition(struct gendisk *hd, struct block_device *bdev)
164 struct parsed_partitions *state;
167 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
171 disk_name(hd, 0, state->name);
172 printk(KERN_INFO " %s:", state->name);
173 if (isdigit(state->name[strlen(state->name)-1]))
174 sprintf(state->name, "p");
176 state->limit = disk_max_parts(hd) + 1;
178 while (!res && check_part[i]) {
179 memset(&state->parts, 0, sizeof(state->parts));
180 res = check_part[i++](state, bdev);
182 /* We have hit an I/O error which we don't report now.
183 * But record it, and let the others do their job.
193 /* The partition is unrecognized. So report I/O errors if there were any */
196 printk(" unknown partition table\n");
197 else if (warn_no_part)
198 printk(" unable to read partition table\n");
203 static ssize_t part_start_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
206 struct hd_struct *p = dev_to_part(dev);
208 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
211 static ssize_t part_size_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
214 struct hd_struct *p = dev_to_part(dev);
215 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
218 static ssize_t part_stat_show(struct device *dev,
219 struct device_attribute *attr, char *buf)
221 struct hd_struct *p = dev_to_part(dev);
224 cpu = disk_stat_lock();
225 part_round_stats(cpu, p);
228 "%8lu %8lu %8llu %8u "
229 "%8lu %8lu %8llu %8u "
232 part_stat_read(p, ios[READ]),
233 part_stat_read(p, merges[READ]),
234 (unsigned long long)part_stat_read(p, sectors[READ]),
235 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
236 part_stat_read(p, ios[WRITE]),
237 part_stat_read(p, merges[WRITE]),
238 (unsigned long long)part_stat_read(p, sectors[WRITE]),
239 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
241 jiffies_to_msecs(part_stat_read(p, io_ticks)),
242 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
245 #ifdef CONFIG_FAIL_MAKE_REQUEST
246 static ssize_t part_fail_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
249 struct hd_struct *p = dev_to_part(dev);
251 return sprintf(buf, "%d\n", p->make_it_fail);
254 static ssize_t part_fail_store(struct device *dev,
255 struct device_attribute *attr,
256 const char *buf, size_t count)
258 struct hd_struct *p = dev_to_part(dev);
261 if (count > 0 && sscanf(buf, "%d", &i) > 0)
262 p->make_it_fail = (i == 0) ? 0 : 1;
268 static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
269 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
270 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
271 #ifdef CONFIG_FAIL_MAKE_REQUEST
272 static struct device_attribute dev_attr_fail =
273 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
276 static struct attribute *part_attrs[] = {
277 &dev_attr_start.attr,
280 #ifdef CONFIG_FAIL_MAKE_REQUEST
286 static struct attribute_group part_attr_group = {
290 static struct attribute_group *part_attr_groups[] = {
295 static void part_release(struct device *dev)
297 struct hd_struct *p = dev_to_part(dev);
302 struct device_type part_type = {
304 .groups = part_attr_groups,
305 .release = part_release,
308 static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
312 k = kobject_get(&disk->dev.kobj);
313 disk->holder_dir = kobject_create_and_add("holders", k);
314 disk->slave_dir = kobject_create_and_add("slaves", k);
318 static void delete_partition_rcu_cb(struct rcu_head *head)
320 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
322 part->start_sect = 0;
324 part_stat_set_all(part, 0);
325 put_device(&part->dev);
328 void delete_partition(struct gendisk *disk, int partno)
330 struct hd_struct *part;
332 part = disk->__part[partno-1];
336 rcu_assign_pointer(disk->__part[partno-1], NULL);
337 kobject_put(part->holder_dir);
338 device_del(&part->dev);
340 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
343 static ssize_t whole_disk_show(struct device *dev,
344 struct device_attribute *attr, char *buf)
348 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
349 whole_disk_show, NULL);
351 int add_partition(struct gendisk *disk, int partno,
352 sector_t start, sector_t len, int flags)
357 if (disk->__part[partno - 1])
360 p = kzalloc(sizeof(*p), GFP_KERNEL);
364 if (!init_part_stats(p)) {
368 p->start_sect = start;
371 p->policy = disk->policy;
373 if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
374 snprintf(p->dev.bus_id, BUS_ID_SIZE,
375 "%sp%d", disk->dev.bus_id, partno);
377 snprintf(p->dev.bus_id, BUS_ID_SIZE,
378 "%s%d", disk->dev.bus_id, partno);
380 device_initialize(&p->dev);
381 p->dev.devt = MKDEV(disk->major, disk->first_minor + partno);
382 p->dev.class = &block_class;
383 p->dev.type = &part_type;
384 p->dev.parent = &disk->dev;
386 /* delay uevent until 'holders' subdir is created */
387 p->dev.uevent_suppress = 1;
388 err = device_add(&p->dev);
393 p->holder_dir = kobject_create_and_add("holders", &p->dev.kobj);
397 p->dev.uevent_suppress = 0;
398 if (flags & ADDPART_FLAG_WHOLEDISK) {
399 err = device_create_file(&p->dev, &dev_attr_whole_disk);
404 /* everything is up and running, commence */
405 INIT_RCU_HEAD(&p->rcu_head);
406 rcu_assign_pointer(disk->__part[partno - 1], p);
408 /* suppress uevent if the disk supresses it */
409 if (!disk->dev.uevent_suppress)
410 kobject_uevent(&p->dev.kobj, KOBJ_ADD);
418 kobject_put(p->holder_dir);
425 /* Not exported, helper to add_disk(). */
426 void register_disk(struct gendisk *disk)
428 struct block_device *bdev;
429 struct disk_part_iter piter;
430 struct hd_struct *part;
434 disk->dev.parent = disk->driverfs_dev;
436 strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
437 /* ewww... some of these buggers have / in the name... */
438 s = strchr(disk->dev.bus_id, '/');
442 /* delay uevents, until we scanned partition table */
443 disk->dev.uevent_suppress = 1;
445 if (device_add(&disk->dev))
447 #ifndef CONFIG_SYSFS_DEPRECATED
448 err = sysfs_create_link(block_depr, &disk->dev.kobj,
449 kobject_name(&disk->dev.kobj));
451 device_del(&disk->dev);
455 disk_sysfs_add_subdirs(disk);
457 /* No minors to use for partitions */
458 if (!disk_max_parts(disk))
461 /* No such device (e.g., media were just removed) */
462 if (!get_capacity(disk))
465 bdev = bdget_disk(disk, 0);
469 bdev->bd_invalidated = 1;
470 err = blkdev_get(bdev, FMODE_READ, 0);
476 /* announce disk after possible partitions are created */
477 disk->dev.uevent_suppress = 0;
478 kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
480 /* announce possible partitions */
481 disk_part_iter_init(&piter, disk, 0);
482 while ((part = disk_part_iter_next(&piter)))
483 kobject_uevent(&part->dev.kobj, KOBJ_ADD);
484 disk_part_iter_exit(&piter);
487 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
489 struct disk_part_iter piter;
490 struct hd_struct *part;
491 struct parsed_partitions *state;
494 if (bdev->bd_part_count)
496 res = invalidate_partition(disk, 0);
499 bdev->bd_invalidated = 0;
501 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
502 while ((part = disk_part_iter_next(&piter)))
503 delete_partition(disk, part->partno);
504 disk_part_iter_exit(&piter);
506 if (disk->fops->revalidate_disk)
507 disk->fops->revalidate_disk(disk);
508 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
510 if (IS_ERR(state)) /* I/O error reading the partition table */
513 /* tell userspace that the media / partition table may have changed */
514 kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
516 for (p = 1; p < state->limit; p++) {
517 sector_t size = state->parts[p].size;
518 sector_t from = state->parts[p].from;
521 if (from + size > get_capacity(disk)) {
523 "%s: p%d exceeds device capacity\n",
526 res = add_partition(disk, p, from, size, state->parts[p].flags);
528 printk(KERN_ERR " %s: p%d could not be added: %d\n",
529 disk->disk_name, p, -res);
532 #ifdef CONFIG_BLK_DEV_MD
533 if (state->parts[p].flags & ADDPART_FLAG_RAID)
534 md_autodetect_dev(bdev->bd_dev+p);
541 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
543 struct address_space *mapping = bdev->bd_inode->i_mapping;
546 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
552 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
554 page_cache_release(page);
560 EXPORT_SYMBOL(read_dev_sector);
562 void del_gendisk(struct gendisk *disk)
564 struct disk_part_iter piter;
565 struct hd_struct *part;
567 /* invalidate stuff */
568 disk_part_iter_init(&piter, disk,
569 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
570 while ((part = disk_part_iter_next(&piter))) {
571 invalidate_partition(disk, part->partno);
572 delete_partition(disk, part->partno);
574 disk_part_iter_exit(&piter);
576 invalidate_partition(disk, 0);
578 disk->flags &= ~GENHD_FL_UP;
579 unlink_gendisk(disk);
580 disk_stat_set_all(disk, 0);
583 kobject_put(disk->holder_dir);
584 kobject_put(disk->slave_dir);
585 disk->driverfs_dev = NULL;
586 #ifndef CONFIG_SYSFS_DEPRECATED
587 sysfs_remove_link(block_depr, disk->dev.bus_id);
589 device_del(&disk->dev);