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_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
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 * There's very little reason to use this, you should really
142 * have a struct block_device just about everywhere and use
143 * bdevname() instead.
145 const char *__bdevname(dev_t dev, char *buffer)
147 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
148 MAJOR(dev), MINOR(dev));
152 EXPORT_SYMBOL(__bdevname);
154 static struct parsed_partitions *
155 check_partition(struct gendisk *hd, struct block_device *bdev)
157 struct parsed_partitions *state;
160 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
164 #ifdef CONFIG_DEVFS_FS
165 if (hd->devfs_name[0] != '\0') {
166 printk(KERN_INFO " /dev/%s:", hd->devfs_name);
167 sprintf(state->name, "p");
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 = hd->minors;
178 while (!res && check_part[i]) {
179 memset(&state->parts, 0, sizeof(state->parts));
180 res = check_part[i++](state, bdev);
185 printk(" unknown partition table\n");
186 else if (warn_no_part)
187 printk(" unable to read partition table\n");
193 * sysfs bindings for partitions
196 struct part_attribute {
197 struct attribute attr;
198 ssize_t (*show)(struct hd_struct *,char *);
199 ssize_t (*store)(struct hd_struct *,const char *, size_t);
203 part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
205 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
206 struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
209 ret = part_attr->show(p, page);
213 part_attr_store(struct kobject * kobj, struct attribute * attr,
214 const char *page, size_t count)
216 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
217 struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
220 if (part_attr->store)
221 ret = part_attr->store(p, page, count);
225 static struct sysfs_ops part_sysfs_ops = {
226 .show = part_attr_show,
227 .store = part_attr_store,
230 static ssize_t part_uevent_store(struct hd_struct * p,
231 const char *page, size_t count)
233 kobject_uevent(&p->kobj, KOBJ_ADD);
236 static ssize_t part_dev_read(struct hd_struct * p, char *page)
238 struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
239 dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno);
240 return print_dev_t(page, dev);
242 static ssize_t part_start_read(struct hd_struct * p, char *page)
244 return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
246 static ssize_t part_size_read(struct hd_struct * p, char *page)
248 return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
250 static ssize_t part_stat_read(struct hd_struct * p, char *page)
252 return sprintf(page, "%8u %8llu %8u %8llu\n",
253 p->ios[0], (unsigned long long)p->sectors[0],
254 p->ios[1], (unsigned long long)p->sectors[1]);
256 static struct part_attribute part_attr_uevent = {
257 .attr = {.name = "uevent", .mode = S_IWUSR },
258 .store = part_uevent_store
260 static struct part_attribute part_attr_dev = {
261 .attr = {.name = "dev", .mode = S_IRUGO },
262 .show = part_dev_read
264 static struct part_attribute part_attr_start = {
265 .attr = {.name = "start", .mode = S_IRUGO },
266 .show = part_start_read
268 static struct part_attribute part_attr_size = {
269 .attr = {.name = "size", .mode = S_IRUGO },
270 .show = part_size_read
272 static struct part_attribute part_attr_stat = {
273 .attr = {.name = "stat", .mode = S_IRUGO },
274 .show = part_stat_read
277 static struct attribute * default_attrs[] = {
278 &part_attr_uevent.attr,
280 &part_attr_start.attr,
281 &part_attr_size.attr,
282 &part_attr_stat.attr,
286 extern struct subsystem block_subsys;
288 static void part_release(struct kobject *kobj)
290 struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
294 struct kobj_type ktype_part = {
295 .release = part_release,
296 .default_attrs = default_attrs,
297 .sysfs_ops = &part_sysfs_ops,
300 static inline void partition_sysfs_add_subdir(struct hd_struct *p)
304 k = kobject_get(&p->kobj);
305 p->holder_dir = kobject_add_dir(k, "holders");
309 static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
313 k = kobject_get(&disk->kobj);
314 disk->holder_dir = kobject_add_dir(k, "holders");
315 disk->slave_dir = kobject_add_dir(k, "slaves");
319 void delete_partition(struct gendisk *disk, int part)
321 struct hd_struct *p = disk->part[part-1];
326 disk->part[part-1] = NULL;
329 p->ios[0] = p->ios[1] = 0;
330 p->sectors[0] = p->sectors[1] = 0;
331 devfs_remove("%s/part%d", disk->devfs_name, part);
333 kobject_unregister(p->holder_dir);
334 kobject_uevent(&p->kobj, KOBJ_REMOVE);
335 kobject_del(&p->kobj);
336 kobject_put(&p->kobj);
339 void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
343 p = kmalloc(sizeof(*p), GFP_KERNEL);
347 memset(p, 0, sizeof(*p));
348 p->start_sect = start;
352 devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
353 S_IFBLK|S_IRUSR|S_IWUSR,
354 "%s/part%d", disk->devfs_name, part);
356 if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
357 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
359 snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
360 p->kobj.parent = &disk->kobj;
361 p->kobj.ktype = &ktype_part;
362 kobject_init(&p->kobj);
363 kobject_add(&p->kobj);
364 if (!disk->part_uevent_suppress)
365 kobject_uevent(&p->kobj, KOBJ_ADD);
366 partition_sysfs_add_subdir(p);
367 disk->part[part-1] = p;
370 static char *make_block_name(struct gendisk *disk)
373 static char *block_str = "block:";
377 size = strlen(block_str) + strlen(disk->disk_name) + 1;
378 name = kmalloc(size, GFP_KERNEL);
381 strcpy(name, block_str);
382 strcat(name, disk->disk_name);
383 /* ewww... some of these buggers have / in name... */
384 s = strchr(name, '/');
390 static void disk_sysfs_symlinks(struct gendisk *disk)
392 struct device *target = get_device(disk->driverfs_dev);
394 char *disk_name = make_block_name(disk);
395 sysfs_create_link(&disk->kobj,&target->kobj,"device");
397 sysfs_create_link(&target->kobj,&disk->kobj,disk_name);
403 /* Not exported, helper to add_disk(). */
404 void register_disk(struct gendisk *disk)
406 struct block_device *bdev;
412 strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
413 /* ewww... some of these buggers have / in name... */
414 s = strchr(disk->kobj.name, '/');
417 if ((err = kobject_add(&disk->kobj)))
419 disk_sysfs_symlinks(disk);
420 disk_sysfs_add_subdirs(disk);
422 /* No minors to use for partitions */
423 if (disk->minors == 1) {
424 if (disk->devfs_name[0] != '\0')
425 devfs_add_disk(disk);
429 /* always add handle for the whole disk */
430 devfs_add_partitioned(disk);
432 /* No such device (e.g., media were just removed) */
433 if (!get_capacity(disk))
436 bdev = bdget_disk(disk, 0);
440 /* scan partition table, but suppress uevents */
441 bdev->bd_invalidated = 1;
442 disk->part_uevent_suppress = 1;
443 err = blkdev_get(bdev, FMODE_READ, 0);
444 disk->part_uevent_suppress = 0;
450 /* announce disk after possible partitions are already created */
451 kobject_uevent(&disk->kobj, KOBJ_ADD);
453 /* announce possible partitions */
454 for (i = 1; i < disk->minors; i++) {
456 if (!p || !p->nr_sects)
458 kobject_uevent(&p->kobj, KOBJ_ADD);
462 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
464 struct parsed_partitions *state;
467 if (bdev->bd_part_count)
469 res = invalidate_partition(disk, 0);
472 bdev->bd_invalidated = 0;
473 for (p = 1; p < disk->minors; p++)
474 delete_partition(disk, p);
475 if (disk->fops->revalidate_disk)
476 disk->fops->revalidate_disk(disk);
477 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
479 for (p = 1; p < state->limit; p++) {
480 sector_t size = state->parts[p].size;
481 sector_t from = state->parts[p].from;
484 add_partition(disk, p, from, size);
485 #ifdef CONFIG_BLK_DEV_MD
486 if (state->parts[p].flags)
487 md_autodetect_dev(bdev->bd_dev+p);
494 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
496 struct address_space *mapping = bdev->bd_inode->i_mapping;
499 page = read_cache_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
500 (filler_t *)mapping->a_ops->readpage, NULL);
502 wait_on_page_locked(page);
503 if (!PageUptodate(page))
508 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
510 page_cache_release(page);
516 EXPORT_SYMBOL(read_dev_sector);
518 void del_gendisk(struct gendisk *disk)
522 /* invalidate stuff */
523 for (p = disk->minors - 1; p > 0; p--) {
524 invalidate_partition(disk, p);
525 delete_partition(disk, p);
527 invalidate_partition(disk, 0);
529 disk->flags &= ~GENHD_FL_UP;
530 unlink_gendisk(disk);
531 disk_stat_set_all(disk, 0);
534 devfs_remove_disk(disk);
536 kobject_uevent(&disk->kobj, KOBJ_REMOVE);
537 if (disk->holder_dir)
538 kobject_unregister(disk->holder_dir);
540 kobject_unregister(disk->slave_dir);
541 if (disk->driverfs_dev) {
542 char *disk_name = make_block_name(disk);
543 sysfs_remove_link(&disk->kobj, "device");
545 sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
548 put_device(disk->driverfs_dev);
549 disk->driverfs_dev = NULL;
551 kobject_del(&disk->kobj);