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/devfs_fs_kernel.h>
39 #ifdef CONFIG_BLK_DEV_MD
40 extern void md_autodetect_dev(dev_t dev);
43 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
45 static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
47 * Probe partition formats with tables at disk address 0
48 * that also have an ADFS boot block at 0xdc0.
50 #ifdef CONFIG_ACORN_PARTITION_ICS
53 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
54 adfspart_check_POWERTEC,
56 #ifdef CONFIG_ACORN_PARTITION_EESOX
61 * Now move on to formats that only have partition info at
62 * disk address 0xdc0. Since these may also have stale
63 * PC/BIOS partition tables, they need to come before
66 #ifdef CONFIG_ACORN_PARTITION_CUMANA
67 adfspart_check_CUMANA,
69 #ifdef CONFIG_ACORN_PARTITION_ADFS
73 #ifdef CONFIG_EFI_PARTITION
74 efi_partition, /* this must come before msdos */
76 #ifdef CONFIG_LDM_PARTITION
77 ldm_partition, /* this must come before msdos */
79 #ifdef CONFIG_NEC98_PARTITION
80 nec98_partition, /* must be come before `msdos_partition' */
82 #ifdef CONFIG_MSDOS_PARTITION
85 #ifdef CONFIG_OSF_PARTITION
88 #ifdef CONFIG_SUN_PARTITION
91 #ifdef CONFIG_AMIGA_PARTITION
94 #ifdef CONFIG_ATARI_PARTITION
97 #ifdef CONFIG_MAC_PARTITION
100 #ifdef CONFIG_SGI_PARTITION
103 #ifdef CONFIG_ULTRIX_PARTITION
106 #ifdef CONFIG_IBM_PARTITION
113 * disk_name() is used by partition check code and the genhd driver.
114 * It formats the devicename of the indicated disk into
115 * the supplied buffer (of size at least 32), and returns
116 * a pointer to that same buffer (for convenience).
119 char *disk_name(struct gendisk *hd, int part, char *buf)
122 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
123 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
124 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
126 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
131 const char *bdevname(struct block_device *bdev, char *buf)
133 int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
134 return disk_name(bdev->bd_disk, part, buf);
137 EXPORT_SYMBOL(bdevname);
140 * NOTE: this cannot be called from interrupt context.
142 * But in interrupt context you should really have a struct
143 * block_device anyway and use bdevname() above.
145 const char *__bdevname(dev_t dev, char *buffer)
147 struct gendisk *disk;
150 disk = get_gendisk(dev, &part);
152 buffer = disk_name(disk, part, buffer);
155 snprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
156 MAJOR(dev), MINOR(dev));
162 EXPORT_SYMBOL(__bdevname);
164 static struct parsed_partitions *
165 check_partition(struct gendisk *hd, struct block_device *bdev)
167 struct parsed_partitions *state;
170 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
174 #ifdef CONFIG_DEVFS_FS
175 if (hd->devfs_name[0] != '\0') {
176 printk(KERN_INFO " /dev/%s:", hd->devfs_name);
177 sprintf(state->name, "p");
181 disk_name(hd, 0, state->name);
182 printk(KERN_INFO " %s:", state->name);
183 if (isdigit(state->name[strlen(state->name)-1]))
184 sprintf(state->name, "p");
186 state->limit = hd->minors;
188 while (!res && check_part[i]) {
189 memset(&state->parts, 0, sizeof(state->parts));
190 res = check_part[i++](state, bdev);
195 printk(" unknown partition table\n");
196 else if (warn_no_part)
197 printk(" unable to read partition table\n");
203 * sysfs bindings for partitions
206 struct part_attribute {
207 struct attribute attr;
208 ssize_t (*show)(struct hd_struct *,char *);
212 part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
214 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
215 struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
218 ret = part_attr->show(p,page);
222 static struct sysfs_ops part_sysfs_ops = {
223 .show = part_attr_show,
226 static ssize_t part_dev_read(struct hd_struct * p, char *page)
228 struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
229 dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno);
230 return print_dev_t(page, dev);
232 static ssize_t part_start_read(struct hd_struct * p, char *page)
234 return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
236 static ssize_t part_size_read(struct hd_struct * p, char *page)
238 return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
240 static ssize_t part_stat_read(struct hd_struct * p, char *page)
242 return sprintf(page, "%8u %8llu %8u %8llu\n",
243 p->reads, (unsigned long long)p->read_sectors,
244 p->writes, (unsigned long long)p->write_sectors);
246 static struct part_attribute part_attr_dev = {
247 .attr = {.name = "dev", .mode = S_IRUGO },
248 .show = part_dev_read
250 static struct part_attribute part_attr_start = {
251 .attr = {.name = "start", .mode = S_IRUGO },
252 .show = part_start_read
254 static struct part_attribute part_attr_size = {
255 .attr = {.name = "size", .mode = S_IRUGO },
256 .show = part_size_read
258 static struct part_attribute part_attr_stat = {
259 .attr = {.name = "stat", .mode = S_IRUGO },
260 .show = part_stat_read
263 static struct attribute * default_attrs[] = {
265 &part_attr_start.attr,
266 &part_attr_size.attr,
267 &part_attr_stat.attr,
271 extern struct subsystem block_subsys;
273 static void part_release(struct kobject *kobj)
275 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
279 struct kobj_type ktype_part = {
280 .release = part_release,
281 .default_attrs = default_attrs,
282 .sysfs_ops = &part_sysfs_ops,
285 void delete_partition(struct gendisk *disk, int part)
287 struct hd_struct *p = disk->part[part-1];
292 disk->part[part-1] = NULL;
295 p->reads = p->writes = p->read_sectors = p->write_sectors = 0;
296 devfs_remove("%s/part%d", disk->devfs_name, part);
297 kobject_unregister(&p->kobj);
300 void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
304 p = kmalloc(sizeof(*p), GFP_KERNEL);
308 memset(p, 0, sizeof(*p));
309 p->start_sect = start;
313 devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
314 S_IFBLK|S_IRUSR|S_IWUSR,
315 "%s/part%d", disk->devfs_name, part);
317 if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
318 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
320 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
321 p->kobj.parent = &disk->kobj;
322 p->kobj.ktype = &ktype_part;
323 kobject_register(&p->kobj);
324 disk->part[part-1] = p;
327 static void disk_sysfs_symlinks(struct gendisk *disk)
329 struct device *target = get_device(disk->driverfs_dev);
331 sysfs_create_link(&disk->kobj,&target->kobj,"device");
332 sysfs_create_link(&target->kobj,&disk->kobj,"block");
336 /* Not exported, helper to add_disk(). */
337 void register_disk(struct gendisk *disk)
339 struct parsed_partitions *state;
340 struct block_device *bdev;
345 strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
346 /* ewww... some of these buggers have / in name... */
347 s = strchr(disk->kobj.name, '/');
350 if ((err = kobject_add(&disk->kobj)))
352 disk_sysfs_symlinks(disk);
354 /* No minors to use for partitions */
355 if (disk->minors == 1) {
356 if (disk->devfs_name[0] != '\0')
357 devfs_add_disk(disk);
361 /* always add handle for the whole disk */
362 devfs_add_partitioned(disk);
364 /* No such device (e.g., media were just removed) */
365 if (!get_capacity(disk))
368 bdev = bdget_disk(disk, 0);
372 if (blkdev_get(bdev, FMODE_READ, 0) < 0)
374 state = check_partition(disk, bdev);
376 for (j = 1; j < state->limit; j++) {
377 sector_t size = state->parts[j].size;
378 sector_t from = state->parts[j].from;
381 add_partition(disk, j, from, size);
382 #ifdef CONFIG_BLK_DEV_MD
383 if (!state->parts[j].flags)
385 md_autodetect_dev(bdev->bd_dev+j);
393 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
395 struct parsed_partitions *state;
398 if (bdev->bd_part_count)
400 res = invalidate_partition(disk, 0);
403 bdev->bd_invalidated = 0;
404 for (p = 1; p < disk->minors; p++)
405 delete_partition(disk, p);
406 if (disk->fops->revalidate_disk)
407 disk->fops->revalidate_disk(disk);
408 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
410 for (p = 1; p < state->limit; p++) {
411 sector_t size = state->parts[p].size;
412 sector_t from = state->parts[p].from;
415 add_partition(disk, p, from, size);
416 #ifdef CONFIG_BLK_DEV_MD
417 if (state->parts[p].flags)
418 md_autodetect_dev(bdev->bd_dev+p);
425 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
427 struct address_space *mapping = bdev->bd_inode->i_mapping;
430 page = read_cache_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
431 (filler_t *)mapping->a_ops->readpage, NULL);
433 wait_on_page_locked(page);
434 if (!PageUptodate(page))
439 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
441 page_cache_release(page);
447 EXPORT_SYMBOL(read_dev_sector);
449 void del_gendisk(struct gendisk *disk)
453 /* invalidate stuff */
454 for (p = disk->minors - 1; p > 0; p--) {
455 invalidate_partition(disk, p);
456 delete_partition(disk, p);
458 invalidate_partition(disk, 0);
460 disk->flags &= ~GENHD_FL_UP;
461 unlink_gendisk(disk);
462 disk_stat_set_all(disk, 0);
463 disk->stamp = disk->stamp_idle = 0;
465 devfs_remove_disk(disk);
467 if (disk->driverfs_dev) {
468 sysfs_remove_link(&disk->kobj, "device");
469 sysfs_remove_link(&disk->driverfs_dev->kobj, "block");
470 put_device(disk->driverfs_dev);
472 kobject_del(&disk->kobj);