[linux-2.6-block.git] / fs / partitions / check.c

/*
 *  fs/partitions/check.c
 *
 *  Code extracted from drivers/block/genhd.c
 *  Copyright (C) 1991-1998  Linus Torvalds
 *  Re-organised Feb 1998 Russell King
 *
 *  We now have independent partition support from the
 *  block drivers, which allows all the partition code to
 *  be grouped in one location, and it to be mostly self
 *  contained.
 *
 *  Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kmod.h>
#include <linux/ctype.h>

#include "check.h"

#include "acorn.h"
#include "amiga.h"
#include "atari.h"
#include "ldm.h"
#include "mac.h"
#include "msdos.h"
#include "osf.h"
#include "sgi.h"
#include "sun.h"
#include "ibm.h"
#include "ultrix.h"
#include "efi.h"
#include "karma.h"

#ifdef CONFIG_BLK_DEV_MD
extern void md_autodetect_dev(dev_t dev);
#endif

int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/

static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
	/*
	 * Probe partition formats with tables at disk address 0
	 * that also have an ADFS boot block at 0xdc0.
	 */
#ifdef CONFIG_ACORN_PARTITION_ICS
	adfspart_check_ICS,
#endif
#ifdef CONFIG_ACORN_PARTITION_POWERTEC
	adfspart_check_POWERTEC,
#endif
#ifdef CONFIG_ACORN_PARTITION_EESOX
	adfspart_check_EESOX,
#endif

	/*
	 * Now move on to formats that only have partition info at
	 * disk address 0xdc0.  Since these may also have stale
	 * PC/BIOS partition tables, they need to come before
	 * the msdos entry.
	 */
#ifdef CONFIG_ACORN_PARTITION_CUMANA
	adfspart_check_CUMANA,
#endif
#ifdef CONFIG_ACORN_PARTITION_ADFS
	adfspart_check_ADFS,
#endif

#ifdef CONFIG_EFI_PARTITION
	efi_partition,		/* this must come before msdos */
#endif
#ifdef CONFIG_SGI_PARTITION
	sgi_partition,
#endif
#ifdef CONFIG_LDM_PARTITION
	ldm_partition,		/* this must come before msdos */
#endif
#ifdef CONFIG_MSDOS_PARTITION
	msdos_partition,
#endif
#ifdef CONFIG_OSF_PARTITION
	osf_partition,
#endif
#ifdef CONFIG_SUN_PARTITION
	sun_partition,
#endif
#ifdef CONFIG_AMIGA_PARTITION
	amiga_partition,
#endif
#ifdef CONFIG_ATARI_PARTITION
	atari_partition,
#endif
#ifdef CONFIG_MAC_PARTITION
	mac_partition,
#endif
#ifdef CONFIG_ULTRIX_PARTITION
	ultrix_partition,
#endif
#ifdef CONFIG_IBM_PARTITION
	ibm_partition,
#endif
#ifdef CONFIG_KARMA_PARTITION
	karma_partition,
#endif
	NULL
};
 
/*
 * disk_name() is used by partition check code and the genhd driver.
 * It formats the devicename of the indicated disk into
 * the supplied buffer (of size at least 32), and returns
 * a pointer to that same buffer (for convenience).
 */

char *disk_name(struct gendisk *hd, int part, char *buf)
{
	if (!part)
		snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
	else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
		snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
	else
		snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);

	return buf;
}

const char *bdevname(struct block_device *bdev, char *buf)
{
	int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
	return disk_name(bdev->bd_disk, part, buf);
}

EXPORT_SYMBOL(bdevname);

/*
 * There's very little reason to use this, you should really
 * have a struct block_device just about everywhere and use
 * bdevname() instead.
 */
const char *__bdevname(dev_t dev, char *buffer)
{
	scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
				MAJOR(dev), MINOR(dev));
	return buffer;
}

EXPORT_SYMBOL(__bdevname);

static struct parsed_partitions *
check_partition(struct gendisk *hd, struct block_device *bdev)
{
	struct parsed_partitions *state;
	int i, res;

	state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
	if (!state)
		return NULL;

	disk_name(hd, 0, state->name);
	printk(KERN_INFO " %s:", state->name);
	if (isdigit(state->name[strlen(state->name)-1]))
		sprintf(state->name, "p");

	state->limit = hd->minors;
	i = res = 0;
	while (!res && check_part[i]) {
		memset(&state->parts, 0, sizeof(state->parts));
		res = check_part[i++](state, bdev);
	}
	if (res > 0)
		return state;
	if (!res)
		printk(" unknown partition table\n");
	else if (warn_no_part)
		printk(" unable to read partition table\n");
	kfree(state);
	return ERR_PTR(res);
}

/*
 * sysfs bindings for partitions
 */

struct part_attribute {
	struct attribute attr;
	ssize_t (*show)(struct hd_struct *,char *);
	ssize_t (*store)(struct hd_struct *,const char *, size_t);
};

static ssize_t 
part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
{
	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
	ssize_t ret = 0;
	if (part_attr->show)
		ret = part_attr->show(p, page);
	return ret;
}
static ssize_t
part_attr_store(struct kobject * kobj, struct attribute * attr,
		const char *page, size_t count)
{
	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
	ssize_t ret = 0;

	if (part_attr->store)
		ret = part_attr->store(p, page, count);
	return ret;
}

static struct sysfs_ops part_sysfs_ops = {
	.show	=	part_attr_show,
	.store	=	part_attr_store,
};

static ssize_t part_uevent_store(struct hd_struct * p,
				 const char *page, size_t count)
{
	kobject_uevent(&p->kobj, KOBJ_ADD);
	return count;
}
static ssize_t part_dev_read(struct hd_struct * p, char *page)
{
	struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
	dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno); 
	return print_dev_t(page, dev);
}
static ssize_t part_start_read(struct hd_struct * p, char *page)
{
	return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
}
static ssize_t part_size_read(struct hd_struct * p, char *page)
{
	return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
}
static ssize_t part_stat_read(struct hd_struct * p, char *page)
{
	return sprintf(page, "%8u %8llu %8u %8llu\n",
		       p->ios[0], (unsigned long long)p->sectors[0],
		       p->ios[1], (unsigned long long)p->sectors[1]);
}
static struct part_attribute part_attr_uevent = {
	.attr = {.name = "uevent", .mode = S_IWUSR },
	.store	= part_uevent_store
};
static struct part_attribute part_attr_dev = {
	.attr = {.name = "dev", .mode = S_IRUGO },
	.show	= part_dev_read
};
static struct part_attribute part_attr_start = {
	.attr = {.name = "start", .mode = S_IRUGO },
	.show	= part_start_read
};
static struct part_attribute part_attr_size = {
	.attr = {.name = "size", .mode = S_IRUGO },
	.show	= part_size_read
};
static struct part_attribute part_attr_stat = {
	.attr = {.name = "stat", .mode = S_IRUGO },
	.show	= part_stat_read
};

static struct attribute * default_attrs[] = {
	&part_attr_uevent.attr,
	&part_attr_dev.attr,
	&part_attr_start.attr,
	&part_attr_size.attr,
	&part_attr_stat.attr,
	NULL,
};

extern struct subsystem block_subsys;

static void part_release(struct kobject *kobj)
{
	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	kfree(p);
}

struct kobj_type ktype_part = {
	.release	= part_release,
	.default_attrs	= default_attrs,
	.sysfs_ops	= &part_sysfs_ops,
};

static inline void partition_sysfs_add_subdir(struct hd_struct *p)
{
	struct kobject *k;

	k = kobject_get(&p->kobj);
	p->holder_dir = kobject_add_dir(k, "holders");
	kobject_put(k);
}

static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
{
	struct kobject *k;

	k = kobject_get(&disk->kobj);
	disk->holder_dir = kobject_add_dir(k, "holders");
	disk->slave_dir = kobject_add_dir(k, "slaves");
	kobject_put(k);
}

void delete_partition(struct gendisk *disk, int part)
{
	struct hd_struct *p = disk->part[part-1];
	if (!p)
		return;
	if (!p->nr_sects)
		return;
	disk->part[part-1] = NULL;
	p->start_sect = 0;
	p->nr_sects = 0;
	p->ios[0] = p->ios[1] = 0;
	p->sectors[0] = p->sectors[1] = 0;
	sysfs_remove_link(&p->kobj, "subsystem");
	if (p->holder_dir)
		kobject_unregister(p->holder_dir);
	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	kobject_del(&p->kobj);
	kobject_put(&p->kobj);
}

void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
{
	struct hd_struct *p;

	p = kmalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return;
	
	memset(p, 0, sizeof(*p));
	p->start_sect = start;
	p->nr_sects = len;
	p->partno = part;
	p->policy = disk->policy;

	if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
		snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
	else
		snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
	p->kobj.parent = &disk->kobj;
	p->kobj.ktype = &ktype_part;
	kobject_init(&p->kobj);
	kobject_add(&p->kobj);
	if (!disk->part_uevent_suppress)
		kobject_uevent(&p->kobj, KOBJ_ADD);
	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
	partition_sysfs_add_subdir(p);
	disk->part[part-1] = p;
}

static char *make_block_name(struct gendisk *disk)
{
	char *name;
	static char *block_str = "block:";
	int size;
	char *s;

	size = strlen(block_str) + strlen(disk->disk_name) + 1;
	name = kmalloc(size, GFP_KERNEL);
	if (!name)
		return NULL;
	strcpy(name, block_str);
	strcat(name, disk->disk_name);
	/* ewww... some of these buggers have / in name... */
	s = strchr(name, '/');
	if (s)
		*s = '!';
	return name;
}

static int disk_sysfs_symlinks(struct gendisk *disk)
{
	struct device *target = get_device(disk->driverfs_dev);
	int err;
	char *disk_name = NULL;

	if (target) {
		disk_name = make_block_name(disk);
		if (!disk_name) {
			err = -ENOMEM;
			goto err_out;
		}

		err = sysfs_create_link(&disk->kobj, &target->kobj, "device");
		if (err)
			goto err_out_disk_name;

		err = sysfs_create_link(&target->kobj, &disk->kobj, disk_name);
		if (err)
			goto err_out_dev_link;
	}

	err = sysfs_create_link(&disk->kobj, &block_subsys.kset.kobj,
				"subsystem");
	if (err)
		goto err_out_disk_name_lnk;

	kfree(disk_name);

	return 0;

err_out_disk_name_lnk:
	if (target) {
		sysfs_remove_link(&target->kobj, disk_name);
err_out_dev_link:
		sysfs_remove_link(&disk->kobj, "device");
err_out_disk_name:
		kfree(disk_name);
err_out:
		put_device(target);
	}
	return err;
}

/* Not exported, helper to add_disk(). */
void register_disk(struct gendisk *disk)
{
	struct block_device *bdev;
	char *s;
	int i;
	struct hd_struct *p;
	int err;

	strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
	/* ewww... some of these buggers have / in name... */
	s = strchr(disk->kobj.name, '/');
	if (s)
		*s = '!';
	if ((err = kobject_add(&disk->kobj)))
		return;
	err = disk_sysfs_symlinks(disk);
	if (err) {
		kobject_del(&disk->kobj);
		return;
	}
 	disk_sysfs_add_subdirs(disk);

	/* No minors to use for partitions */
	if (disk->minors == 1)
		goto exit;

	/* No such device (e.g., media were just removed) */
	if (!get_capacity(disk))
		goto exit;

	bdev = bdget_disk(disk, 0);
	if (!bdev)
		goto exit;

	/* scan partition table, but suppress uevents */
	bdev->bd_invalidated = 1;
	disk->part_uevent_suppress = 1;
	err = blkdev_get(bdev, FMODE_READ, 0);
	disk->part_uevent_suppress = 0;
	if (err < 0)
		goto exit;
	blkdev_put(bdev);

exit:
	/* announce disk after possible partitions are already created */
	kobject_uevent(&disk->kobj, KOBJ_ADD);

	/* announce possible partitions */
	for (i = 1; i < disk->minors; i++) {
		p = disk->part[i-1];
		if (!p || !p->nr_sects)
			continue;
		kobject_uevent(&p->kobj, KOBJ_ADD);
	}
}

int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
{
	struct parsed_partitions *state;
	int p, res;

	if (bdev->bd_part_count)
		return -EBUSY;
	res = invalidate_partition(disk, 0);
	if (res)
		return res;
	bdev->bd_invalidated = 0;
	for (p = 1; p < disk->minors; p++)
		delete_partition(disk, p);
	if (disk->fops->revalidate_disk)
		disk->fops->revalidate_disk(disk);
	if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
		return 0;
	if (IS_ERR(state))	/* I/O error reading the partition table */
		return PTR_ERR(state);
	for (p = 1; p < state->limit; p++) {
		sector_t size = state->parts[p].size;
		sector_t from = state->parts[p].from;
		if (!size)
			continue;
		if (from + size > get_capacity(disk)) {
			printk(" %s: p%d exceeds device capacity\n",
				disk->disk_name, p);
		}
		add_partition(disk, p, from, size);
#ifdef CONFIG_BLK_DEV_MD
		if (state->parts[p].flags)
			md_autodetect_dev(bdev->bd_dev+p);
#endif
	}
	kfree(state);
	return 0;
}

unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
{
	struct address_space *mapping = bdev->bd_inode->i_mapping;
	struct page *page;

	page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
				 NULL);
	if (!IS_ERR(page)) {
		wait_on_page_locked(page);
		if (!PageUptodate(page))
			goto fail;
		if (PageError(page))
			goto fail;
		p->v = page;
		return (unsigned char *)page_address(page) +  ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
fail:
		page_cache_release(page);
	}
	p->v = NULL;
	return NULL;
}

EXPORT_SYMBOL(read_dev_sector);

void del_gendisk(struct gendisk *disk)
{
	int p;

	/* invalidate stuff */
	for (p = disk->minors - 1; p > 0; p--) {
		invalidate_partition(disk, p);
		delete_partition(disk, p);
	}
	invalidate_partition(disk, 0);
	disk->capacity = 0;
	disk->flags &= ~GENHD_FL_UP;
	unlink_gendisk(disk);
	disk_stat_set_all(disk, 0);
	disk->stamp = 0;

	kobject_uevent(&disk->kobj, KOBJ_REMOVE);
	if (disk->holder_dir)
		kobject_unregister(disk->holder_dir);
	if (disk->slave_dir)
		kobject_unregister(disk->slave_dir);
	if (disk->driverfs_dev) {
		char *disk_name = make_block_name(disk);
		sysfs_remove_link(&disk->kobj, "device");
		if (disk_name) {
			sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
			kfree(disk_name);
		}
		put_device(disk->driverfs_dev);
		disk->driverfs_dev = NULL;
	}
	sysfs_remove_link(&disk->kobj, "subsystem");
	kobject_del(&disk->kobj);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/partitions/check.c
	3	*
	4	* Code extracted from drivers/block/genhd.c
	5	* Copyright (C) 1991-1998 Linus Torvalds
	6	* Re-organised Feb 1998 Russell King
	7	*
	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
	11	* contained.
	12	*
	13	* Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/module.h>
	18	#include <linux/fs.h>
	19	#include <linux/kmod.h>
	20	#include <linux/ctype.h>
1da177e4 LT	21
1da177e4 LT	22	#include "check.h"
1da177e4 LT	23
	24	#include "acorn.h"
	25	#include "amiga.h"
	26	#include "atari.h"
	27	#include "ldm.h"
	28	#include "mac.h"
	29	#include "msdos.h"
	30	#include "osf.h"
	31	#include "sgi.h"
	32	#include "sun.h"
	33	#include "ibm.h"
	34	#include "ultrix.h"
	35	#include "efi.h"
0e6e1db4	36	#include "karma.h"
1da177e4 LT	37
	38	#ifdef CONFIG_BLK_DEV_MD
	39	extern void md_autodetect_dev(dev_t dev);
	40	#endif
	41
	42	int warn_no_part = 1; /This is ugly: should make genhd removable media aware/
	43
	44	static int (check_part[])(struct parsed_partitions , struct block_device *) = {
	45	/*
	46	* Probe partition formats with tables at disk address 0
	47	* that also have an ADFS boot block at 0xdc0.
	48	*/
	49	#ifdef CONFIG_ACORN_PARTITION_ICS
	50	adfspart_check_ICS,
	51	#endif
	52	#ifdef CONFIG_ACORN_PARTITION_POWERTEC
	53	adfspart_check_POWERTEC,
	54	#endif
	55	#ifdef CONFIG_ACORN_PARTITION_EESOX
	56	adfspart_check_EESOX,
	57	#endif
	58
	59	/*
	60	* Now move on to formats that only have partition info at
	61	* disk address 0xdc0. Since these may also have stale
	62	* PC/BIOS partition tables, they need to come before
	63	* the msdos entry.
	64	*/
	65	#ifdef CONFIG_ACORN_PARTITION_CUMANA
	66	adfspart_check_CUMANA,
	67	#endif
	68	#ifdef CONFIG_ACORN_PARTITION_ADFS
	69	adfspart_check_ADFS,
	70	#endif
	71
	72	#ifdef CONFIG_EFI_PARTITION
	73	efi_partition, /* this must come before msdos */
	74	#endif
	75	#ifdef CONFIG_SGI_PARTITION
	76	sgi_partition,
	77	#endif
	78	#ifdef CONFIG_LDM_PARTITION
	79	ldm_partition, /* this must come before msdos */
	80	#endif
1da177e4 LT	81	#ifdef CONFIG_MSDOS_PARTITION
	82	msdos_partition,
	83	#endif
	84	#ifdef CONFIG_OSF_PARTITION
	85	osf_partition,
	86	#endif
	87	#ifdef CONFIG_SUN_PARTITION
	88	sun_partition,
	89	#endif
	90	#ifdef CONFIG_AMIGA_PARTITION
	91	amiga_partition,
	92	#endif
	93	#ifdef CONFIG_ATARI_PARTITION
	94	atari_partition,
	95	#endif
	96	#ifdef CONFIG_MAC_PARTITION
	97	mac_partition,
	98	#endif
	99	#ifdef CONFIG_ULTRIX_PARTITION
	100	ultrix_partition,
	101	#endif
	102	#ifdef CONFIG_IBM_PARTITION
	103	ibm_partition,
0e6e1db4 BC	104	#endif
	105	#ifdef CONFIG_KARMA_PARTITION
	106	karma_partition,
1da177e4 LT	107	#endif
	108	NULL
	109	};
	110
	111	/*
	112	* disk_name() is used by partition check code and the genhd driver.
	113	* It formats the devicename of the indicated disk into
	114	* the supplied buffer (of size at least 32), and returns
	115	* a pointer to that same buffer (for convenience).
	116	*/
	117
	118	char disk_name(struct gendisk hd, int part, char *buf)
	119	{
	120	if (!part)
	121	snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
	122	else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
	123	snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
	124	else
	125	snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
	126
	127	return buf;
	128	}
	129
	130	const char bdevname(struct block_device bdev, char *buf)
	131	{
	132	int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
	133	return disk_name(bdev->bd_disk, part, buf);
	134	}
	135
	136	EXPORT_SYMBOL(bdevname);
	137
	138	/*
	139	* There's very little reason to use this, you should really
	140	* have a struct block_device just about everywhere and use
	141	* bdevname() instead.
	142	*/
	143	const char __bdevname(dev_t dev, char buffer)
	144	{
	145	scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
	146	MAJOR(dev), MINOR(dev));
	147	return buffer;
	148	}
	149
	150	EXPORT_SYMBOL(__bdevname);
	151
	152	static struct parsed_partitions *
	153	check_partition(struct gendisk hd, struct block_device bdev)
	154	{
	155	struct parsed_partitions *state;
	156	int i, res;
	157
	158	state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
	159	if (!state)
	160	return NULL;
	161
a2964188 GKH	162	disk_name(hd, 0, state->name);
	163	printk(KERN_INFO " %s:", state->name);
	164	if (isdigit(state->name[strlen(state->name)-1]))
1da177e4	165	sprintf(state->name, "p");
a2964188	166
1da177e4 LT	167	state->limit = hd->minors;
	168	i = res = 0;
	169	while (!res && check_part[i]) {
	170	memset(&state->parts, 0, sizeof(state->parts));
	171	res = check_part[i++](state, bdev);
	172	}
	173	if (res > 0)
	174	return state;
	175	if (!res)
	176	printk(" unknown partition table\n");
	177	else if (warn_no_part)
	178	printk(" unable to read partition table\n");
	179	kfree(state);
5127d002	180	return ERR_PTR(res);
1da177e4 LT	181	}
	182
	183	/*
	184	* sysfs bindings for partitions
	185	*/
	186
	187	struct part_attribute {
	188	struct attribute attr;
	189	ssize_t (show)(struct hd_struct ,char *);
a7fd6706	190	ssize_t (store)(struct hd_struct ,const char *, size_t);
1da177e4 LT	191	};
	192
	193	static ssize_t
	194	part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
	195	{
	196	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	197	struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
	198	ssize_t ret = 0;
	199	if (part_attr->show)
a7fd6706 KS	200	ret = part_attr->show(p, page);
	201	return ret;
	202	}
	203	static ssize_t
	204	part_attr_store(struct kobject * kobj, struct attribute * attr,
	205	const char *page, size_t count)
	206	{
	207	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	208	struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
	209	ssize_t ret = 0;
	210
	211	if (part_attr->store)
	212	ret = part_attr->store(p, page, count);
1da177e4 LT	213	return ret;
	214	}
	215
	216	static struct sysfs_ops part_sysfs_ops = {
	217	.show = part_attr_show,
a7fd6706	218	.store = part_attr_store,
1da177e4 LT	219	};
1da177e4 LT	220
a7fd6706 KS	221	static ssize_t part_uevent_store(struct hd_struct * p,
	222	const char *page, size_t count)
	223	{
312c004d	224	kobject_uevent(&p->kobj, KOBJ_ADD);
a7fd6706 KS	225	return count;
a7fd6706 KS	226	}
1da177e4 LT	227	static ssize_t part_dev_read(struct hd_struct * p, char *page)
	228	{
	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);
	232	}
	233	static ssize_t part_start_read(struct hd_struct * p, char *page)
	234	{
	235	return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
	236	}
	237	static ssize_t part_size_read(struct hd_struct * p, char *page)
	238	{
	239	return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
	240	}
	241	static ssize_t part_stat_read(struct hd_struct * p, char *page)
	242	{
	243	return sprintf(page, "%8u %8llu %8u %8llu\n",
a362357b JA	244	p->ios[0], (unsigned long long)p->sectors[0],
a362357b JA	245	p->ios[1], (unsigned long long)p->sectors[1]);
1da177e4	246	}
a7fd6706 KS	247	static struct part_attribute part_attr_uevent = {
	248	.attr = {.name = "uevent", .mode = S_IWUSR },
	249	.store = part_uevent_store
	250	};
1da177e4 LT	251	static struct part_attribute part_attr_dev = {
	252	.attr = {.name = "dev", .mode = S_IRUGO },
	253	.show = part_dev_read
	254	};
	255	static struct part_attribute part_attr_start = {
	256	.attr = {.name = "start", .mode = S_IRUGO },
	257	.show = part_start_read
	258	};
	259	static struct part_attribute part_attr_size = {
	260	.attr = {.name = "size", .mode = S_IRUGO },
	261	.show = part_size_read
	262	};
	263	static struct part_attribute part_attr_stat = {
	264	.attr = {.name = "stat", .mode = S_IRUGO },
	265	.show = part_stat_read
	266	};
	267
	268	static struct attribute * default_attrs[] = {
a7fd6706	269	&part_attr_uevent.attr,
1da177e4 LT	270	&part_attr_dev.attr,
	271	&part_attr_start.attr,
	272	&part_attr_size.attr,
	273	&part_attr_stat.attr,
	274	NULL,
	275	};
	276
	277	extern struct subsystem block_subsys;
	278
	279	static void part_release(struct kobject *kobj)
	280	{
	281	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	282	kfree(p);
	283	}
	284
	285	struct kobj_type ktype_part = {
	286	.release = part_release,
	287	.default_attrs = default_attrs,
	288	.sysfs_ops = &part_sysfs_ops,
	289	};
	290
6a4d44c1 JN	291	static inline void partition_sysfs_add_subdir(struct hd_struct *p)
	292	{
	293	struct kobject *k;
	294
	295	k = kobject_get(&p->kobj);
	296	p->holder_dir = kobject_add_dir(k, "holders");
	297	kobject_put(k);
	298	}
	299
	300	static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
	301	{
	302	struct kobject *k;
	303
	304	k = kobject_get(&disk->kobj);
	305	disk->holder_dir = kobject_add_dir(k, "holders");
	306	disk->slave_dir = kobject_add_dir(k, "slaves");
	307	kobject_put(k);
	308	}
6a4d44c1	309
1da177e4 LT	310	void delete_partition(struct gendisk *disk, int part)
	311	{
	312	struct hd_struct *p = disk->part[part-1];
	313	if (!p)
	314	return;
	315	if (!p->nr_sects)
	316	return;
	317	disk->part[part-1] = NULL;
	318	p->start_sect = 0;
	319	p->nr_sects = 0;
a362357b JA	320	p->ios[0] = p->ios[1] = 0;
a362357b JA	321	p->sectors[0] = p->sectors[1] = 0;
b9d9c82b	322	sysfs_remove_link(&p->kobj, "subsystem");
6a4d44c1 JN	323	if (p->holder_dir)
6a4d44c1 JN	324	kobject_unregister(p->holder_dir);
d4d7e5df KS	325	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	326	kobject_del(&p->kobj);
	327	kobject_put(&p->kobj);
1da177e4 LT	328	}
	329
	330	void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
	331	{
	332	struct hd_struct *p;
	333
	334	p = kmalloc(sizeof(*p), GFP_KERNEL);
	335	if (!p)
	336	return;
	337
	338	memset(p, 0, sizeof(*p));
	339	p->start_sect = start;
	340	p->nr_sects = len;
	341	p->partno = part;
25e206b5	342	p->policy = disk->policy;
1da177e4	343
1da177e4 LT	344	if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
	345	snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
	346	else
	347	snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
	348	p->kobj.parent = &disk->kobj;
	349	p->kobj.ktype = &ktype_part;
d4d7e5df KS	350	kobject_init(&p->kobj);
	351	kobject_add(&p->kobj);
	352	if (!disk->part_uevent_suppress)
	353	kobject_uevent(&p->kobj, KOBJ_ADD);
b9d9c82b	354	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
6a4d44c1	355	partition_sysfs_add_subdir(p);
1da177e4 LT	356	disk->part[part-1] = p;
	357	}
	358
8218ef80 GKH	359	static char make_block_name(struct gendisk disk)
	360	{
	361	char *name;
	362	static char *block_str = "block:";
	363	int size;
2436f039	364	char *s;
8218ef80 GKH	365
	366	size = strlen(block_str) + strlen(disk->disk_name) + 1;
	367	name = kmalloc(size, GFP_KERNEL);
	368	if (!name)
	369	return NULL;
	370	strcpy(name, block_str);
	371	strcat(name, disk->disk_name);
2436f039 SR	372	/* ewww... some of these buggers have / in name... */
	373	s = strchr(name, '/');
	374	if (s)
	375	*s = '!';
8218ef80 GKH	376	return name;
	377	}
	378
eee44cca	379	static int disk_sysfs_symlinks(struct gendisk *disk)
1da177e4 LT	380	{
1da177e4 LT	381	struct device *target = get_device(disk->driverfs_dev);
eee44cca JG	382	int err;
	383	char *disk_name = NULL;
	384
1da177e4	385	if (target) {
eee44cca JG	386	disk_name = make_block_name(disk);
	387	if (!disk_name) {
	388	err = -ENOMEM;
	389	goto err_out;
8218ef80	390	}
eee44cca JG	391
	392	err = sysfs_create_link(&disk->kobj, &target->kobj, "device");
	393	if (err)
	394	goto err_out_disk_name;
	395
	396	err = sysfs_create_link(&target->kobj, &disk->kobj, disk_name);
	397	if (err)
	398	goto err_out_dev_link;
	399	}
	400
	401	err = sysfs_create_link(&disk->kobj, &block_subsys.kset.kobj,
	402	"subsystem");
	403	if (err)
	404	goto err_out_disk_name_lnk;
	405
	406	kfree(disk_name);
	407
	408	return 0;
	409
	410	err_out_disk_name_lnk:
	411	if (target) {
	412	sysfs_remove_link(&target->kobj, disk_name);
	413	err_out_dev_link:
	414	sysfs_remove_link(&disk->kobj, "device");
	415	err_out_disk_name:
	416	kfree(disk_name);
	417	err_out:
	418	put_device(target);
1da177e4	419	}
eee44cca	420	return err;
1da177e4 LT	421	}
	422
	423	/* Not exported, helper to add_disk(). */
	424	void register_disk(struct gendisk *disk)
	425	{
	426	struct block_device *bdev;
	427	char *s;
d4d7e5df KS	428	int i;
d4d7e5df KS	429	struct hd_struct *p;
1da177e4 LT	430	int err;
	431
	432	strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
	433	/* ewww... some of these buggers have / in name... */
	434	s = strchr(disk->kobj.name, '/');
	435	if (s)
	436	*s = '!';
	437	if ((err = kobject_add(&disk->kobj)))
	438	return;
eee44cca JG	439	err = disk_sysfs_symlinks(disk);
	440	if (err) {
	441	kobject_del(&disk->kobj);
	442	return;
	443	}
6a4d44c1	444	disk_sysfs_add_subdirs(disk);
1da177e4 LT	445
1da177e4 LT	446	/* No minors to use for partitions */
a2964188	447	if (disk->minors == 1)
d4d7e5df	448	goto exit;
1da177e4 LT	449
	450	/* No such device (e.g., media were just removed) */
	451	if (!get_capacity(disk))
d4d7e5df	452	goto exit;
1da177e4 LT	453
	454	bdev = bdget_disk(disk, 0);
	455	if (!bdev)
d4d7e5df	456	goto exit;
1da177e4	457
d4d7e5df	458	/* scan partition table, but suppress uevents */
1da177e4	459	bdev->bd_invalidated = 1;
d4d7e5df KS	460	disk->part_uevent_suppress = 1;
	461	err = blkdev_get(bdev, FMODE_READ, 0);
	462	disk->part_uevent_suppress = 0;
	463	if (err < 0)
	464	goto exit;
1da177e4	465	blkdev_put(bdev);
d4d7e5df KS	466
	467	exit:
	468	/* announce disk after possible partitions are already created */
	469	kobject_uevent(&disk->kobj, KOBJ_ADD);
	470
	471	/* announce possible partitions */
	472	for (i = 1; i < disk->minors; i++) {
	473	p = disk->part[i-1];
	474	if (!p \|\| !p->nr_sects)
	475	continue;
	476	kobject_uevent(&p->kobj, KOBJ_ADD);
	477	}
1da177e4 LT	478	}
	479
	480	int rescan_partitions(struct gendisk disk, struct block_device bdev)
	481	{
	482	struct parsed_partitions *state;
	483	int p, res;
	484
	485	if (bdev->bd_part_count)
	486	return -EBUSY;
	487	res = invalidate_partition(disk, 0);
	488	if (res)
	489	return res;
	490	bdev->bd_invalidated = 0;
	491	for (p = 1; p < disk->minors; p++)
	492	delete_partition(disk, p);
	493	if (disk->fops->revalidate_disk)
	494	disk->fops->revalidate_disk(disk);
	495	if (!get_capacity(disk) \|\| !(state = check_partition(disk, bdev)))
	496	return 0;
5127d002 SK	497	if (IS_ERR(state)) /* I/O error reading the partition table */
5127d002 SK	498	return PTR_ERR(state);
1da177e4 LT	499	for (p = 1; p < state->limit; p++) {
	500	sector_t size = state->parts[p].size;
	501	sector_t from = state->parts[p].from;
	502	if (!size)
	503	continue;
98bd34ea MM	504	if (from + size > get_capacity(disk)) {
	505	printk(" %s: p%d exceeds device capacity\n",
	506	disk->disk_name, p);
	507	}
1da177e4 LT	508	add_partition(disk, p, from, size);
	509	#ifdef CONFIG_BLK_DEV_MD
	510	if (state->parts[p].flags)
	511	md_autodetect_dev(bdev->bd_dev+p);
	512	#endif
	513	}
	514	kfree(state);
	515	return 0;
	516	}
	517
	518	unsigned char read_dev_sector(struct block_device bdev, sector_t n, Sector *p)
	519	{
	520	struct address_space *mapping = bdev->bd_inode->i_mapping;
	521	struct page *page;
	522
090d2b18 PE	523	page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
090d2b18 PE	524	NULL);
1da177e4 LT	525	if (!IS_ERR(page)) {
	526	wait_on_page_locked(page);
	527	if (!PageUptodate(page))
	528	goto fail;
	529	if (PageError(page))
	530	goto fail;
	531	p->v = page;
	532	return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
	533	fail:
	534	page_cache_release(page);
	535	}
	536	p->v = NULL;
	537	return NULL;
	538	}
	539
	540	EXPORT_SYMBOL(read_dev_sector);
	541
	542	void del_gendisk(struct gendisk *disk)
	543	{
	544	int p;
	545
	546	/* invalidate stuff */
	547	for (p = disk->minors - 1; p > 0; p--) {
	548	invalidate_partition(disk, p);
	549	delete_partition(disk, p);
	550	}
	551	invalidate_partition(disk, 0);
	552	disk->capacity = 0;
	553	disk->flags &= ~GENHD_FL_UP;
	554	unlink_gendisk(disk);
	555	disk_stat_set_all(disk, 0);
20e5c81f	556	disk->stamp = 0;
1da177e4	557
032ebf26	558	kobject_uevent(&disk->kobj, KOBJ_REMOVE);
6a4d44c1 JN	559	if (disk->holder_dir)
	560	kobject_unregister(disk->holder_dir);
	561	if (disk->slave_dir)
	562	kobject_unregister(disk->slave_dir);
1da177e4	563	if (disk->driverfs_dev) {
8218ef80	564	char *disk_name = make_block_name(disk);
1da177e4	565	sysfs_remove_link(&disk->kobj, "device");
8218ef80 GKH	566	if (disk_name) {
	567	sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
	568	kfree(disk_name);
	569	}
1da177e4	570	put_device(disk->driverfs_dev);
032ebf26	571	disk->driverfs_dev = NULL;
1da177e4	572	}
b9d9c82b	573	sysfs_remove_link(&disk->kobj, "subsystem");
1da177e4 LT	574	kobject_del(&disk->kobj);
1da177e4 LT	575	}