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>
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_LDM_PARTITION
78 ldm_partition, /* this must come before msdos */
80 #ifdef CONFIG_NEC98_PARTITION
81 nec98_partition, /* must be come before `msdos_partition' */
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_SGI_PARTITION
104 #ifdef CONFIG_ULTRIX_PARTITION
107 #ifdef CONFIG_IBM_PARTITION
114 * disk_name() is used by partition check code and the genhd driver.
115 * It formats the devicename of the indicated disk into
116 * the supplied buffer (of size at least 32), and returns
117 * a pointer to that same buffer (for convenience).
120 char *disk_name(struct gendisk *hd, int part, char *buf)
123 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
124 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
125 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
127 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
132 const char *bdevname(struct block_device *bdev, char *buf)
134 int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
135 return disk_name(bdev->bd_disk, part, buf);
138 EXPORT_SYMBOL(bdevname);
141 * NOTE: this cannot be called from interrupt context.
143 * But in interrupt context you should really have a struct
144 * block_device anyway and use bdevname() above.
146 const char *__bdevname(dev_t dev, char *buffer)
148 struct gendisk *disk;
151 disk = get_gendisk(dev, &part);
153 buffer = disk_name(disk, part, buffer);
156 snprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
157 MAJOR(dev), MINOR(dev));
163 EXPORT_SYMBOL(__bdevname);
165 static struct parsed_partitions *
166 check_partition(struct gendisk *hd, struct block_device *bdev)
168 struct parsed_partitions *state;
171 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
175 #ifdef CONFIG_DEVFS_FS
176 if (hd->devfs_name[0] != '\0') {
177 printk(KERN_INFO " /dev/%s:", hd->devfs_name);
178 sprintf(state->name, "p");
182 disk_name(hd, 0, state->name);
183 printk(KERN_INFO " %s:", state->name);
184 if (isdigit(state->name[strlen(state->name)-1]))
185 sprintf(state->name, "p");
187 state->limit = hd->minors;
189 while (!res && check_part[i]) {
190 memset(&state->parts, 0, sizeof(state->parts));
191 res = check_part[i++](state, bdev);
196 printk(" unknown partition table\n");
197 else if (warn_no_part)
198 printk(" unable to read partition table\n");
204 * sysfs bindings for partitions
207 struct part_attribute {
208 struct attribute attr;
209 ssize_t (*show)(struct hd_struct *,char *);
213 part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
215 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
216 struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
219 ret = part_attr->show(p,page);
223 static struct sysfs_ops part_sysfs_ops = {
224 .show = part_attr_show,
227 static ssize_t part_dev_read(struct hd_struct * p, char *page)
229 struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
230 dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno);
231 return print_dev_t(page, dev);
233 static ssize_t part_start_read(struct hd_struct * p, char *page)
235 return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
237 static ssize_t part_size_read(struct hd_struct * p, char *page)
239 return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
241 static ssize_t part_stat_read(struct hd_struct * p, char *page)
243 return sprintf(page, "%8u %8llu %8u %8llu\n",
244 p->reads, (unsigned long long)p->read_sectors,
245 p->writes, (unsigned long long)p->write_sectors);
247 static struct part_attribute part_attr_dev = {
248 .attr = {.name = "dev", .mode = S_IRUGO },
249 .show = part_dev_read
251 static struct part_attribute part_attr_start = {
252 .attr = {.name = "start", .mode = S_IRUGO },
253 .show = part_start_read
255 static struct part_attribute part_attr_size = {
256 .attr = {.name = "size", .mode = S_IRUGO },
257 .show = part_size_read
259 static struct part_attribute part_attr_stat = {
260 .attr = {.name = "stat", .mode = S_IRUGO },
261 .show = part_stat_read
264 static struct attribute * default_attrs[] = {
266 &part_attr_start.attr,
267 &part_attr_size.attr,
268 &part_attr_stat.attr,
272 extern struct subsystem block_subsys;
274 static void part_release(struct kobject *kobj)
276 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
280 struct kobj_type ktype_part = {
281 .release = part_release,
282 .default_attrs = default_attrs,
283 .sysfs_ops = &part_sysfs_ops,
286 void delete_partition(struct gendisk *disk, int part)
288 struct hd_struct *p = disk->part[part-1];
293 disk->part[part-1] = NULL;
296 p->reads = p->writes = p->read_sectors = p->write_sectors = 0;
297 devfs_remove("%s/part%d", disk->devfs_name, part);
298 kobject_unregister(&p->kobj);
301 void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
305 p = kmalloc(sizeof(*p), GFP_KERNEL);
309 memset(p, 0, sizeof(*p));
310 p->start_sect = start;
314 devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
315 S_IFBLK|S_IRUSR|S_IWUSR,
316 "%s/part%d", disk->devfs_name, part);
318 if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
319 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
321 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
322 p->kobj.parent = &disk->kobj;
323 p->kobj.ktype = &ktype_part;
324 kobject_register(&p->kobj);
325 disk->part[part-1] = p;
328 static void disk_sysfs_symlinks(struct gendisk *disk)
330 struct device *target = get_device(disk->driverfs_dev);
332 sysfs_create_link(&disk->kobj,&target->kobj,"device");
333 sysfs_create_link(&target->kobj,&disk->kobj,"block");
337 /* Not exported, helper to add_disk(). */
338 void register_disk(struct gendisk *disk)
340 struct parsed_partitions *state;
341 struct block_device *bdev;
346 strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
347 /* ewww... some of these buggers have / in name... */
348 s = strchr(disk->kobj.name, '/');
351 if ((err = kobject_add(&disk->kobj)))
353 disk_sysfs_symlinks(disk);
355 /* No minors to use for partitions */
356 if (disk->minors == 1) {
357 if (disk->devfs_name[0] != '\0')
358 devfs_add_disk(disk);
362 /* always add handle for the whole disk */
363 devfs_add_partitioned(disk);
365 /* No such device (e.g., media were just removed) */
366 if (!get_capacity(disk))
369 bdev = bdget_disk(disk, 0);
373 if (blkdev_get(bdev, FMODE_READ, 0) < 0)
375 state = check_partition(disk, bdev);
377 for (j = 1; j < state->limit; j++) {
378 sector_t size = state->parts[j].size;
379 sector_t from = state->parts[j].from;
382 add_partition(disk, j, from, size);
383 #ifdef CONFIG_BLK_DEV_MD
384 if (!state->parts[j].flags)
386 md_autodetect_dev(bdev->bd_dev+j);
394 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
396 struct parsed_partitions *state;
399 if (bdev->bd_part_count)
401 res = invalidate_partition(disk, 0);
404 bdev->bd_invalidated = 0;
405 for (p = 1; p < disk->minors; p++)
406 delete_partition(disk, p);
407 if (disk->fops->revalidate_disk)
408 disk->fops->revalidate_disk(disk);
409 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
411 for (p = 1; p < state->limit; p++) {
412 sector_t size = state->parts[p].size;
413 sector_t from = state->parts[p].from;
416 add_partition(disk, p, from, size);
417 #ifdef CONFIG_BLK_DEV_MD
418 if (state->parts[p].flags)
419 md_autodetect_dev(bdev->bd_dev+p);
426 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
428 struct address_space *mapping = bdev->bd_inode->i_mapping;
431 page = read_cache_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
432 (filler_t *)mapping->a_ops->readpage, NULL);
434 wait_on_page_locked(page);
435 if (!PageUptodate(page))
440 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
442 page_cache_release(page);
448 EXPORT_SYMBOL(read_dev_sector);
450 void del_gendisk(struct gendisk *disk)
454 /* invalidate stuff */
455 for (p = disk->minors - 1; p > 0; p--) {
456 invalidate_partition(disk, p);
457 delete_partition(disk, p);
459 invalidate_partition(disk, 0);
461 disk->flags &= ~GENHD_FL_UP;
462 unlink_gendisk(disk);
463 disk_stat_set_all(disk, 0);
464 disk->stamp = disk->stamp_idle = 0;
466 devfs_remove_disk(disk);
468 if (disk->driverfs_dev) {
469 sysfs_remove_link(&disk->kobj, "device");
470 sysfs_remove_link(&disk->driverfs_dev->kobj, "block");
471 put_device(disk->driverfs_dev);
473 kobject_del(&disk->kobj);