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 blk_free_devt(part_devt(part));
337 rcu_assign_pointer(disk->__part[partno-1], NULL);
338 kobject_put(part->holder_dir);
339 device_del(&part->dev);
341 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
344 static ssize_t whole_disk_show(struct device *dev,
345 struct device_attribute *attr, char *buf)
349 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
350 whole_disk_show, NULL);
352 int add_partition(struct gendisk *disk, int partno,
353 sector_t start, sector_t len, int flags)
356 dev_t devt = MKDEV(0, 0);
359 if (disk->__part[partno - 1])
362 p = kzalloc(sizeof(*p), GFP_KERNEL);
366 if (!init_part_stats(p)) {
370 p->start_sect = start;
373 p->policy = disk->policy;
375 if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
376 snprintf(p->dev.bus_id, BUS_ID_SIZE,
377 "%sp%d", disk->dev.bus_id, partno);
379 snprintf(p->dev.bus_id, BUS_ID_SIZE,
380 "%s%d", disk->dev.bus_id, partno);
382 device_initialize(&p->dev);
383 p->dev.class = &block_class;
384 p->dev.type = &part_type;
385 p->dev.parent = &disk->dev;
387 err = blk_alloc_devt(p, &devt);
392 /* delay uevent until 'holders' subdir is created */
393 p->dev.uevent_suppress = 1;
394 err = device_add(&p->dev);
399 p->holder_dir = kobject_create_and_add("holders", &p->dev.kobj);
403 p->dev.uevent_suppress = 0;
404 if (flags & ADDPART_FLAG_WHOLEDISK) {
405 err = device_create_file(&p->dev, &dev_attr_whole_disk);
410 /* everything is up and running, commence */
411 INIT_RCU_HEAD(&p->rcu_head);
412 rcu_assign_pointer(disk->__part[partno - 1], p);
414 /* suppress uevent if the disk supresses it */
415 if (!disk->dev.uevent_suppress)
416 kobject_uevent(&p->dev.kobj, KOBJ_ADD);
424 kobject_put(p->holder_dir);
432 /* Not exported, helper to add_disk(). */
433 void register_disk(struct gendisk *disk)
435 struct block_device *bdev;
436 struct disk_part_iter piter;
437 struct hd_struct *part;
441 disk->dev.parent = disk->driverfs_dev;
443 strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
444 /* ewww... some of these buggers have / in the name... */
445 s = strchr(disk->dev.bus_id, '/');
449 /* delay uevents, until we scanned partition table */
450 disk->dev.uevent_suppress = 1;
452 if (device_add(&disk->dev))
454 #ifndef CONFIG_SYSFS_DEPRECATED
455 err = sysfs_create_link(block_depr, &disk->dev.kobj,
456 kobject_name(&disk->dev.kobj));
458 device_del(&disk->dev);
462 disk_sysfs_add_subdirs(disk);
464 /* No minors to use for partitions */
465 if (!disk_max_parts(disk))
468 /* No such device (e.g., media were just removed) */
469 if (!get_capacity(disk))
472 bdev = bdget_disk(disk, 0);
476 bdev->bd_invalidated = 1;
477 err = blkdev_get(bdev, FMODE_READ, 0);
483 /* announce disk after possible partitions are created */
484 disk->dev.uevent_suppress = 0;
485 kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
487 /* announce possible partitions */
488 disk_part_iter_init(&piter, disk, 0);
489 while ((part = disk_part_iter_next(&piter)))
490 kobject_uevent(&part->dev.kobj, KOBJ_ADD);
491 disk_part_iter_exit(&piter);
494 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
496 struct disk_part_iter piter;
497 struct hd_struct *part;
498 struct parsed_partitions *state;
501 if (bdev->bd_part_count)
503 res = invalidate_partition(disk, 0);
506 bdev->bd_invalidated = 0;
508 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
509 while ((part = disk_part_iter_next(&piter)))
510 delete_partition(disk, part->partno);
511 disk_part_iter_exit(&piter);
513 if (disk->fops->revalidate_disk)
514 disk->fops->revalidate_disk(disk);
515 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
517 if (IS_ERR(state)) /* I/O error reading the partition table */
520 /* tell userspace that the media / partition table may have changed */
521 kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
523 for (p = 1; p < state->limit; p++) {
524 sector_t size = state->parts[p].size;
525 sector_t from = state->parts[p].from;
528 if (from + size > get_capacity(disk)) {
530 "%s: p%d exceeds device capacity\n",
533 res = add_partition(disk, p, from, size, state->parts[p].flags);
535 printk(KERN_ERR " %s: p%d could not be added: %d\n",
536 disk->disk_name, p, -res);
539 #ifdef CONFIG_BLK_DEV_MD
540 if (state->parts[p].flags & ADDPART_FLAG_RAID)
541 md_autodetect_dev(bdev->bd_dev+p);
548 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
550 struct address_space *mapping = bdev->bd_inode->i_mapping;
553 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
559 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
561 page_cache_release(page);
567 EXPORT_SYMBOL(read_dev_sector);
569 void del_gendisk(struct gendisk *disk)
571 struct disk_part_iter piter;
572 struct hd_struct *part;
574 /* invalidate stuff */
575 disk_part_iter_init(&piter, disk,
576 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
577 while ((part = disk_part_iter_next(&piter))) {
578 invalidate_partition(disk, part->partno);
579 delete_partition(disk, part->partno);
581 disk_part_iter_exit(&piter);
583 invalidate_partition(disk, 0);
585 disk->flags &= ~GENHD_FL_UP;
586 unlink_gendisk(disk);
587 disk_stat_set_all(disk, 0);
590 kobject_put(disk->holder_dir);
591 kobject_put(disk->slave_dir);
592 disk->driverfs_dev = NULL;
593 #ifndef CONFIG_SYSFS_DEPRECATED
594 sysfs_remove_link(block_depr, disk->dev.bus_id);
596 device_del(&disk->dev);