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
)
137 return disk_name(bdev
->bd_disk
, bdev
->bd_part
->partno
, buf
);
140 EXPORT_SYMBOL(bdevname
);
143 * There's very little reason to use this, you should really
144 * have a struct block_device just about everywhere and use
145 * bdevname() instead.
147 const char *__bdevname(dev_t dev
, char *buffer
)
149 scnprintf(buffer
, BDEVNAME_SIZE
, "unknown-block(%u,%u)",
150 MAJOR(dev
), MINOR(dev
));
154 EXPORT_SYMBOL(__bdevname
);
156 static struct parsed_partitions
*
157 check_partition(struct gendisk
*hd
, struct block_device
*bdev
)
159 struct parsed_partitions
*state
;
162 state
= kmalloc(sizeof(struct parsed_partitions
), GFP_KERNEL
);
166 disk_name(hd
, 0, state
->name
);
167 printk(KERN_INFO
" %s:", state
->name
);
168 if (isdigit(state
->name
[strlen(state
->name
)-1]))
169 sprintf(state
->name
, "p");
171 state
->limit
= disk_max_parts(hd
);
173 while (!res
&& check_part
[i
]) {
174 memset(&state
->parts
, 0, sizeof(state
->parts
));
175 res
= check_part
[i
++](state
, bdev
);
177 /* We have hit an I/O error which we don't report now.
178 * But record it, and let the others do their job.
188 /* The partition is unrecognized. So report I/O errors if there were any */
191 printk(" unknown partition table\n");
192 else if (warn_no_part
)
193 printk(" unable to read partition table\n");
198 static ssize_t
part_start_show(struct device
*dev
,
199 struct device_attribute
*attr
, char *buf
)
201 struct hd_struct
*p
= dev_to_part(dev
);
203 return sprintf(buf
, "%llu\n",(unsigned long long)p
->start_sect
);
206 ssize_t
part_size_show(struct device
*dev
,
207 struct device_attribute
*attr
, char *buf
)
209 struct hd_struct
*p
= dev_to_part(dev
);
210 return sprintf(buf
, "%llu\n",(unsigned long long)p
->nr_sects
);
213 ssize_t
part_stat_show(struct device
*dev
,
214 struct device_attribute
*attr
, char *buf
)
216 struct hd_struct
*p
= dev_to_part(dev
);
219 cpu
= part_stat_lock();
220 part_round_stats(cpu
, p
);
223 "%8lu %8lu %8llu %8u "
224 "%8lu %8lu %8llu %8u "
227 part_stat_read(p
, ios
[READ
]),
228 part_stat_read(p
, merges
[READ
]),
229 (unsigned long long)part_stat_read(p
, sectors
[READ
]),
230 jiffies_to_msecs(part_stat_read(p
, ticks
[READ
])),
231 part_stat_read(p
, ios
[WRITE
]),
232 part_stat_read(p
, merges
[WRITE
]),
233 (unsigned long long)part_stat_read(p
, sectors
[WRITE
]),
234 jiffies_to_msecs(part_stat_read(p
, ticks
[WRITE
])),
236 jiffies_to_msecs(part_stat_read(p
, io_ticks
)),
237 jiffies_to_msecs(part_stat_read(p
, time_in_queue
)));
240 #ifdef CONFIG_FAIL_MAKE_REQUEST
241 ssize_t
part_fail_show(struct device
*dev
,
242 struct device_attribute
*attr
, char *buf
)
244 struct hd_struct
*p
= dev_to_part(dev
);
246 return sprintf(buf
, "%d\n", p
->make_it_fail
);
249 ssize_t
part_fail_store(struct device
*dev
,
250 struct device_attribute
*attr
,
251 const char *buf
, size_t count
)
253 struct hd_struct
*p
= dev_to_part(dev
);
256 if (count
> 0 && sscanf(buf
, "%d", &i
) > 0)
257 p
->make_it_fail
= (i
== 0) ? 0 : 1;
263 static DEVICE_ATTR(start
, S_IRUGO
, part_start_show
, NULL
);
264 static DEVICE_ATTR(size
, S_IRUGO
, part_size_show
, NULL
);
265 static DEVICE_ATTR(stat
, S_IRUGO
, part_stat_show
, NULL
);
266 #ifdef CONFIG_FAIL_MAKE_REQUEST
267 static struct device_attribute dev_attr_fail
=
268 __ATTR(make
-it
-fail
, S_IRUGO
|S_IWUSR
, part_fail_show
, part_fail_store
);
271 static struct attribute
*part_attrs
[] = {
272 &dev_attr_start
.attr
,
275 #ifdef CONFIG_FAIL_MAKE_REQUEST
281 static struct attribute_group part_attr_group
= {
285 static struct attribute_group
*part_attr_groups
[] = {
290 static void part_release(struct device
*dev
)
292 struct hd_struct
*p
= dev_to_part(dev
);
297 struct device_type part_type
= {
299 .groups
= part_attr_groups
,
300 .release
= part_release
,
303 static void delete_partition_rcu_cb(struct rcu_head
*head
)
305 struct hd_struct
*part
= container_of(head
, struct hd_struct
, rcu_head
);
307 part
->start_sect
= 0;
309 part_stat_set_all(part
, 0);
310 put_device(part_to_dev(part
));
313 void delete_partition(struct gendisk
*disk
, int partno
)
315 struct disk_part_tbl
*ptbl
= disk
->part_tbl
;
316 struct hd_struct
*part
;
318 if (partno
>= ptbl
->len
)
321 part
= ptbl
->part
[partno
];
325 blk_free_devt(part_devt(part
));
326 rcu_assign_pointer(ptbl
->part
[partno
], NULL
);
327 kobject_put(part
->holder_dir
);
328 device_del(part_to_dev(part
));
330 call_rcu(&part
->rcu_head
, delete_partition_rcu_cb
);
333 static ssize_t
whole_disk_show(struct device
*dev
,
334 struct device_attribute
*attr
, char *buf
)
338 static DEVICE_ATTR(whole_disk
, S_IRUSR
| S_IRGRP
| S_IROTH
,
339 whole_disk_show
, NULL
);
341 int add_partition(struct gendisk
*disk
, int partno
,
342 sector_t start
, sector_t len
, int flags
)
345 dev_t devt
= MKDEV(0, 0);
346 struct device
*ddev
= disk_to_dev(disk
);
348 struct disk_part_tbl
*ptbl
;
352 err
= disk_expand_part_tbl(disk
, partno
);
355 ptbl
= disk
->part_tbl
;
357 if (ptbl
->part
[partno
])
360 p
= kzalloc(sizeof(*p
), GFP_KERNEL
);
364 if (!init_part_stats(p
)) {
368 pdev
= part_to_dev(p
);
370 p
->start_sect
= start
;
373 p
->policy
= get_disk_ro(disk
);
375 dname
= dev_name(ddev
);
376 if (isdigit(dname
[strlen(dname
) - 1]))
377 snprintf(pdev
->bus_id
, BUS_ID_SIZE
, "%sp%d", dname
, partno
);
379 snprintf(pdev
->bus_id
, BUS_ID_SIZE
, "%s%d", dname
, partno
);
381 device_initialize(pdev
);
382 pdev
->class = &block_class
;
383 pdev
->type
= &part_type
;
386 err
= blk_alloc_devt(p
, &devt
);
391 /* delay uevent until 'holders' subdir is created */
392 pdev
->uevent_suppress
= 1;
393 err
= device_add(pdev
);
398 p
->holder_dir
= kobject_create_and_add("holders", &pdev
->kobj
);
402 pdev
->uevent_suppress
= 0;
403 if (flags
& ADDPART_FLAG_WHOLEDISK
) {
404 err
= device_create_file(pdev
, &dev_attr_whole_disk
);
409 /* everything is up and running, commence */
410 INIT_RCU_HEAD(&p
->rcu_head
);
411 rcu_assign_pointer(ptbl
->part
[partno
], p
);
413 /* suppress uevent if the disk supresses it */
414 if (!ddev
->uevent_suppress
)
415 kobject_uevent(&pdev
->kobj
, KOBJ_ADD
);
423 kobject_put(p
->holder_dir
);
431 /* Not exported, helper to add_disk(). */
432 void register_disk(struct gendisk
*disk
)
434 struct device
*ddev
= disk_to_dev(disk
);
435 struct block_device
*bdev
;
436 struct disk_part_iter piter
;
437 struct hd_struct
*part
;
441 ddev
->parent
= disk
->driverfs_dev
;
443 strlcpy(ddev
->bus_id
, disk
->disk_name
, BUS_ID_SIZE
);
444 /* ewww... some of these buggers have / in the name... */
445 s
= strchr(ddev
->bus_id
, '/');
449 /* delay uevents, until we scanned partition table */
450 ddev
->uevent_suppress
= 1;
452 if (device_add(ddev
))
454 #ifndef CONFIG_SYSFS_DEPRECATED
455 err
= sysfs_create_link(block_depr
, &ddev
->kobj
,
456 kobject_name(&ddev
->kobj
));
462 disk
->part0
.holder_dir
= kobject_create_and_add("holders", &ddev
->kobj
);
463 disk
->slave_dir
= kobject_create_and_add("slaves", &ddev
->kobj
);
465 /* No minors to use for partitions */
466 if (!disk_partitionable(disk
))
469 /* No such device (e.g., media were just removed) */
470 if (!get_capacity(disk
))
473 bdev
= bdget_disk(disk
, 0);
477 bdev
->bd_invalidated
= 1;
478 err
= blkdev_get(bdev
, FMODE_READ
, 0);
484 /* announce disk after possible partitions are created */
485 ddev
->uevent_suppress
= 0;
486 kobject_uevent(&ddev
->kobj
, KOBJ_ADD
);
488 /* announce possible partitions */
489 disk_part_iter_init(&piter
, disk
, 0);
490 while ((part
= disk_part_iter_next(&piter
)))
491 kobject_uevent(&part_to_dev(part
)->kobj
, KOBJ_ADD
);
492 disk_part_iter_exit(&piter
);
495 int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
)
497 struct disk_part_iter piter
;
498 struct hd_struct
*part
;
499 struct parsed_partitions
*state
;
502 if (bdev
->bd_part_count
)
504 res
= invalidate_partition(disk
, 0);
507 bdev
->bd_invalidated
= 0;
509 disk_part_iter_init(&piter
, disk
, DISK_PITER_INCL_EMPTY
);
510 while ((part
= disk_part_iter_next(&piter
)))
511 delete_partition(disk
, part
->partno
);
512 disk_part_iter_exit(&piter
);
514 if (disk
->fops
->revalidate_disk
)
515 disk
->fops
->revalidate_disk(disk
);
516 if (!get_capacity(disk
) || !(state
= check_partition(disk
, bdev
)))
518 if (IS_ERR(state
)) /* I/O error reading the partition table */
521 /* tell userspace that the media / partition table may have changed */
522 kobject_uevent(&disk_to_dev(disk
)->kobj
, KOBJ_CHANGE
);
524 /* Detect the highest partition number and preallocate
525 * disk->part_tbl. This is an optimization and not strictly
528 for (p
= 1, highest
= 0; p
< state
->limit
; p
++)
529 if (state
->parts
[p
].size
)
532 disk_expand_part_tbl(disk
, highest
);
535 for (p
= 1; p
< state
->limit
; p
++) {
536 sector_t size
= state
->parts
[p
].size
;
537 sector_t from
= state
->parts
[p
].from
;
540 if (from
+ size
> get_capacity(disk
)) {
542 "%s: p%d exceeds device capacity\n",
545 res
= add_partition(disk
, p
, from
, size
, state
->parts
[p
].flags
);
547 printk(KERN_ERR
" %s: p%d could not be added: %d\n",
548 disk
->disk_name
, p
, -res
);
551 #ifdef CONFIG_BLK_DEV_MD
552 if (state
->parts
[p
].flags
& ADDPART_FLAG_RAID
)
553 md_autodetect_dev(bdev
->bd_dev
+p
);
560 unsigned char *read_dev_sector(struct block_device
*bdev
, sector_t n
, Sector
*p
)
562 struct address_space
*mapping
= bdev
->bd_inode
->i_mapping
;
565 page
= read_mapping_page(mapping
, (pgoff_t
)(n
>> (PAGE_CACHE_SHIFT
-9)),
571 return (unsigned char *)page_address(page
) + ((n
& ((1 << (PAGE_CACHE_SHIFT
- 9)) - 1)) << 9);
573 page_cache_release(page
);
579 EXPORT_SYMBOL(read_dev_sector
);
581 void del_gendisk(struct gendisk
*disk
)
583 struct disk_part_iter piter
;
584 struct hd_struct
*part
;
586 /* invalidate stuff */
587 disk_part_iter_init(&piter
, disk
,
588 DISK_PITER_INCL_EMPTY
| DISK_PITER_REVERSE
);
589 while ((part
= disk_part_iter_next(&piter
))) {
590 invalidate_partition(disk
, part
->partno
);
591 delete_partition(disk
, part
->partno
);
593 disk_part_iter_exit(&piter
);
595 invalidate_partition(disk
, 0);
596 blk_free_devt(disk_to_dev(disk
)->devt
);
597 set_capacity(disk
, 0);
598 disk
->flags
&= ~GENHD_FL_UP
;
599 unlink_gendisk(disk
);
600 part_stat_set_all(&disk
->part0
, 0);
601 disk
->part0
.stamp
= 0;
603 kobject_put(disk
->part0
.holder_dir
);
604 kobject_put(disk
->slave_dir
);
605 disk
->driverfs_dev
= NULL
;
606 #ifndef CONFIG_SYSFS_DEPRECATED
607 sysfs_remove_link(block_depr
, dev_name(disk_to_dev(disk
)));
609 device_del(disk_to_dev(disk
));