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_SGI_PARTITION
79 #ifdef CONFIG_LDM_PARTITION
80 ldm_partition
, /* this must come before msdos */
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_ULTRIX_PARTITION
103 #ifdef CONFIG_IBM_PARTITION
110 * disk_name() is used by partition check code and the genhd driver.
111 * It formats the devicename of the indicated disk into
112 * the supplied buffer (of size at least 32), and returns
113 * a pointer to that same buffer (for convenience).
116 char *disk_name(struct gendisk
*hd
, int part
, char *buf
)
119 snprintf(buf
, BDEVNAME_SIZE
, "%s", hd
->disk_name
);
120 else if (isdigit(hd
->disk_name
[strlen(hd
->disk_name
)-1]))
121 snprintf(buf
, BDEVNAME_SIZE
, "%sp%d", hd
->disk_name
, part
);
123 snprintf(buf
, BDEVNAME_SIZE
, "%s%d", hd
->disk_name
, part
);
128 const char *bdevname(struct block_device
*bdev
, char *buf
)
130 int part
= MINOR(bdev
->bd_dev
) - bdev
->bd_disk
->first_minor
;
131 return disk_name(bdev
->bd_disk
, part
, buf
);
134 EXPORT_SYMBOL(bdevname
);
137 * There's very little reason to use this, you should really
138 * have a struct block_device just about everywhere and use
139 * bdevname() instead.
141 const char *__bdevname(dev_t dev
, char *buffer
)
143 scnprintf(buffer
, BDEVNAME_SIZE
, "unknown-block(%u,%u)",
144 MAJOR(dev
), MINOR(dev
));
148 EXPORT_SYMBOL(__bdevname
);
150 static struct parsed_partitions
*
151 check_partition(struct gendisk
*hd
, struct block_device
*bdev
)
153 struct parsed_partitions
*state
;
156 state
= kmalloc(sizeof(struct parsed_partitions
), GFP_KERNEL
);
160 #ifdef CONFIG_DEVFS_FS
161 if (hd
->devfs_name
[0] != '\0') {
162 printk(KERN_INFO
" /dev/%s:", hd
->devfs_name
);
163 sprintf(state
->name
, "p");
167 disk_name(hd
, 0, state
->name
);
168 printk(KERN_INFO
" %s:", state
->name
);
169 if (isdigit(state
->name
[strlen(state
->name
)-1]))
170 sprintf(state
->name
, "p");
172 state
->limit
= hd
->minors
;
174 while (!res
&& check_part
[i
]) {
175 memset(&state
->parts
, 0, sizeof(state
->parts
));
176 res
= check_part
[i
++](state
, bdev
);
181 printk(" unknown partition table\n");
182 else if (warn_no_part
)
183 printk(" unable to read partition table\n");
189 * sysfs bindings for partitions
192 struct part_attribute
{
193 struct attribute attr
;
194 ssize_t (*show
)(struct hd_struct
*,char *);
195 ssize_t (*store
)(struct hd_struct
*,const char *, size_t);
199 part_attr_show(struct kobject
* kobj
, struct attribute
* attr
, char * page
)
201 struct hd_struct
* p
= container_of(kobj
,struct hd_struct
,kobj
);
202 struct part_attribute
* part_attr
= container_of(attr
,struct part_attribute
,attr
);
205 ret
= part_attr
->show(p
, page
);
209 part_attr_store(struct kobject
* kobj
, struct attribute
* attr
,
210 const char *page
, size_t count
)
212 struct hd_struct
* p
= container_of(kobj
,struct hd_struct
,kobj
);
213 struct part_attribute
* part_attr
= container_of(attr
,struct part_attribute
,attr
);
216 if (part_attr
->store
)
217 ret
= part_attr
->store(p
, page
, count
);
221 static struct sysfs_ops part_sysfs_ops
= {
222 .show
= part_attr_show
,
223 .store
= part_attr_store
,
226 static ssize_t
part_uevent_store(struct hd_struct
* p
,
227 const char *page
, size_t count
)
229 kobject_hotplug(&p
->kobj
, KOBJ_ADD
);
232 static ssize_t
part_dev_read(struct hd_struct
* p
, char *page
)
234 struct gendisk
*disk
= container_of(p
->kobj
.parent
,struct gendisk
,kobj
);
235 dev_t dev
= MKDEV(disk
->major
, disk
->first_minor
+ p
->partno
);
236 return print_dev_t(page
, dev
);
238 static ssize_t
part_start_read(struct hd_struct
* p
, char *page
)
240 return sprintf(page
, "%llu\n",(unsigned long long)p
->start_sect
);
242 static ssize_t
part_size_read(struct hd_struct
* p
, char *page
)
244 return sprintf(page
, "%llu\n",(unsigned long long)p
->nr_sects
);
246 static ssize_t
part_stat_read(struct hd_struct
* p
, char *page
)
248 return sprintf(page
, "%8u %8llu %8u %8llu\n",
249 p
->reads
, (unsigned long long)p
->read_sectors
,
250 p
->writes
, (unsigned long long)p
->write_sectors
);
252 static struct part_attribute part_attr_uevent
= {
253 .attr
= {.name
= "uevent", .mode
= S_IWUSR
},
254 .store
= part_uevent_store
256 static struct part_attribute part_attr_dev
= {
257 .attr
= {.name
= "dev", .mode
= S_IRUGO
},
258 .show
= part_dev_read
260 static struct part_attribute part_attr_start
= {
261 .attr
= {.name
= "start", .mode
= S_IRUGO
},
262 .show
= part_start_read
264 static struct part_attribute part_attr_size
= {
265 .attr
= {.name
= "size", .mode
= S_IRUGO
},
266 .show
= part_size_read
268 static struct part_attribute part_attr_stat
= {
269 .attr
= {.name
= "stat", .mode
= S_IRUGO
},
270 .show
= part_stat_read
273 static struct attribute
* default_attrs
[] = {
274 &part_attr_uevent
.attr
,
276 &part_attr_start
.attr
,
277 &part_attr_size
.attr
,
278 &part_attr_stat
.attr
,
282 extern struct subsystem block_subsys
;
284 static void part_release(struct kobject
*kobj
)
286 struct hd_struct
* p
= container_of(kobj
,struct hd_struct
,kobj
);
290 struct kobj_type ktype_part
= {
291 .release
= part_release
,
292 .default_attrs
= default_attrs
,
293 .sysfs_ops
= &part_sysfs_ops
,
296 void delete_partition(struct gendisk
*disk
, int part
)
298 struct hd_struct
*p
= disk
->part
[part
-1];
303 disk
->part
[part
-1] = NULL
;
306 p
->reads
= p
->writes
= p
->read_sectors
= p
->write_sectors
= 0;
307 devfs_remove("%s/part%d", disk
->devfs_name
, part
);
308 kobject_unregister(&p
->kobj
);
311 void add_partition(struct gendisk
*disk
, int part
, sector_t start
, sector_t len
)
315 p
= kmalloc(sizeof(*p
), GFP_KERNEL
);
319 memset(p
, 0, sizeof(*p
));
320 p
->start_sect
= start
;
324 devfs_mk_bdev(MKDEV(disk
->major
, disk
->first_minor
+ part
),
325 S_IFBLK
|S_IRUSR
|S_IWUSR
,
326 "%s/part%d", disk
->devfs_name
, part
);
328 if (isdigit(disk
->kobj
.name
[strlen(disk
->kobj
.name
)-1]))
329 snprintf(p
->kobj
.name
,KOBJ_NAME_LEN
,"%sp%d",disk
->kobj
.name
,part
);
331 snprintf(p
->kobj
.name
,KOBJ_NAME_LEN
,"%s%d",disk
->kobj
.name
,part
);
332 p
->kobj
.parent
= &disk
->kobj
;
333 p
->kobj
.ktype
= &ktype_part
;
334 kobject_register(&p
->kobj
);
335 disk
->part
[part
-1] = p
;
338 static void disk_sysfs_symlinks(struct gendisk
*disk
)
340 struct device
*target
= get_device(disk
->driverfs_dev
);
342 sysfs_create_link(&disk
->kobj
,&target
->kobj
,"device");
343 sysfs_create_link(&target
->kobj
,&disk
->kobj
,"block");
347 /* Not exported, helper to add_disk(). */
348 void register_disk(struct gendisk
*disk
)
350 struct block_device
*bdev
;
354 strlcpy(disk
->kobj
.name
,disk
->disk_name
,KOBJ_NAME_LEN
);
355 /* ewww... some of these buggers have / in name... */
356 s
= strchr(disk
->kobj
.name
, '/');
359 if ((err
= kobject_add(&disk
->kobj
)))
361 disk_sysfs_symlinks(disk
);
362 kobject_hotplug(&disk
->kobj
, KOBJ_ADD
);
364 /* No minors to use for partitions */
365 if (disk
->minors
== 1) {
366 if (disk
->devfs_name
[0] != '\0')
367 devfs_add_disk(disk
);
371 /* always add handle for the whole disk */
372 devfs_add_partitioned(disk
);
374 /* No such device (e.g., media were just removed) */
375 if (!get_capacity(disk
))
378 bdev
= bdget_disk(disk
, 0);
382 bdev
->bd_invalidated
= 1;
383 if (blkdev_get(bdev
, FMODE_READ
, 0) < 0)
388 int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
)
390 struct parsed_partitions
*state
;
393 if (bdev
->bd_part_count
)
395 res
= invalidate_partition(disk
, 0);
398 bdev
->bd_invalidated
= 0;
399 for (p
= 1; p
< disk
->minors
; p
++)
400 delete_partition(disk
, p
);
401 if (disk
->fops
->revalidate_disk
)
402 disk
->fops
->revalidate_disk(disk
);
403 if (!get_capacity(disk
) || !(state
= check_partition(disk
, bdev
)))
405 for (p
= 1; p
< state
->limit
; p
++) {
406 sector_t size
= state
->parts
[p
].size
;
407 sector_t from
= state
->parts
[p
].from
;
410 add_partition(disk
, p
, from
, size
);
411 #ifdef CONFIG_BLK_DEV_MD
412 if (state
->parts
[p
].flags
)
413 md_autodetect_dev(bdev
->bd_dev
+p
);
420 unsigned char *read_dev_sector(struct block_device
*bdev
, sector_t n
, Sector
*p
)
422 struct address_space
*mapping
= bdev
->bd_inode
->i_mapping
;
425 page
= read_cache_page(mapping
, (pgoff_t
)(n
>> (PAGE_CACHE_SHIFT
-9)),
426 (filler_t
*)mapping
->a_ops
->readpage
, NULL
);
428 wait_on_page_locked(page
);
429 if (!PageUptodate(page
))
434 return (unsigned char *)page_address(page
) + ((n
& ((1 << (PAGE_CACHE_SHIFT
- 9)) - 1)) << 9);
436 page_cache_release(page
);
442 EXPORT_SYMBOL(read_dev_sector
);
444 void del_gendisk(struct gendisk
*disk
)
448 /* invalidate stuff */
449 for (p
= disk
->minors
- 1; p
> 0; p
--) {
450 invalidate_partition(disk
, p
);
451 delete_partition(disk
, p
);
453 invalidate_partition(disk
, 0);
455 disk
->flags
&= ~GENHD_FL_UP
;
456 unlink_gendisk(disk
);
457 disk_stat_set_all(disk
, 0);
460 devfs_remove_disk(disk
);
462 if (disk
->driverfs_dev
) {
463 sysfs_remove_link(&disk
->kobj
, "device");
464 sysfs_remove_link(&disk
->driverfs_dev
->kobj
, "block");
465 put_device(disk
->driverfs_dev
);
467 kobject_hotplug(&disk
->kobj
, KOBJ_REMOVE
);
468 kobject_del(&disk
->kobj
);