[linux.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 <linux/devfs_fs_kernel.h>

#include "check.h"
#include "devfs.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;

#ifdef CONFIG_DEVFS_FS
	if (hd->devfs_name[0] != '\0') {
		printk(KERN_INFO " /dev/%s:", hd->devfs_name);
		sprintf(state->name, "p");
	}
#endif
	else {
		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 NULL;
}

/*
 * 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;
	devfs_remove("%s/part%d", disk->devfs_name, part);
	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;

	devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
			S_IFBLK|S_IRUSR|S_IWUSR,
			"%s/part%d", disk->devfs_name, part);

	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 void disk_sysfs_symlinks(struct gendisk *disk)
{
	struct device *target = get_device(disk->driverfs_dev);
	if (target) {
		char *disk_name = make_block_name(disk);
		sysfs_create_link(&disk->kobj,&target->kobj,"device");
		if (disk_name) {
			sysfs_create_link(&target->kobj,&disk->kobj,disk_name);
			kfree(disk_name);
		}
	}
	sysfs_create_link(&disk->kobj, &block_subsys.kset.kobj, "subsystem");
}

/* 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;
	disk_sysfs_symlinks(disk);
 	disk_sysfs_add_subdirs(disk);

	/* No minors to use for partitions */
	if (disk->minors == 1) {
		if (disk->devfs_name[0] != '\0')
			devfs_add_disk(disk);
		goto exit;
	}

	/* always add handle for the whole disk */
	devfs_add_partitioned(disk);

	/* 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;
	for (p = 1; p < state->limit; p++) {
		sector_t size = state->parts[p].size;
		sector_t from = state->parts[p].from;
		if (!size)
			continue;
		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;

	devfs_remove_disk(disk);

	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>
	21	#include <linux/devfs_fs_kernel.h>
	22
	23	#include "check.h"
	24	#include "devfs.h"
	25
	26	#include "acorn.h"
	27	#include "amiga.h"
	28	#include "atari.h"
	29	#include "ldm.h"
	30	#include "mac.h"
	31	#include "msdos.h"
	32	#include "osf.h"
	33	#include "sgi.h"
	34	#include "sun.h"
	35	#include "ibm.h"
	36	#include "ultrix.h"
	37	#include "efi.h"
0e6e1db4	38	#include "karma.h"
1da177e4 LT	39
	40	#ifdef CONFIG_BLK_DEV_MD
	41	extern void md_autodetect_dev(dev_t dev);
	42	#endif
	43
	44	int warn_no_part = 1; /This is ugly: should make genhd removable media aware/
	45
	46	static int (check_part[])(struct parsed_partitions , struct block_device *) = {
	47	/*
	48	* Probe partition formats with tables at disk address 0
	49	* that also have an ADFS boot block at 0xdc0.
	50	*/
	51	#ifdef CONFIG_ACORN_PARTITION_ICS
	52	adfspart_check_ICS,
	53	#endif
	54	#ifdef CONFIG_ACORN_PARTITION_POWERTEC
	55	adfspart_check_POWERTEC,
	56	#endif
	57	#ifdef CONFIG_ACORN_PARTITION_EESOX
	58	adfspart_check_EESOX,
	59	#endif
	60
	61	/*
	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
	65	* the msdos entry.
	66	*/
	67	#ifdef CONFIG_ACORN_PARTITION_CUMANA
	68	adfspart_check_CUMANA,
	69	#endif
	70	#ifdef CONFIG_ACORN_PARTITION_ADFS
	71	adfspart_check_ADFS,
	72	#endif
	73
	74	#ifdef CONFIG_EFI_PARTITION
	75	efi_partition, /* this must come before msdos */
	76	#endif
	77	#ifdef CONFIG_SGI_PARTITION
	78	sgi_partition,
	79	#endif
	80	#ifdef CONFIG_LDM_PARTITION
	81	ldm_partition, /* this must come before msdos */
	82	#endif
1da177e4 LT	83	#ifdef CONFIG_MSDOS_PARTITION
	84	msdos_partition,
	85	#endif
	86	#ifdef CONFIG_OSF_PARTITION
	87	osf_partition,
	88	#endif
	89	#ifdef CONFIG_SUN_PARTITION
	90	sun_partition,
	91	#endif
	92	#ifdef CONFIG_AMIGA_PARTITION
	93	amiga_partition,
	94	#endif
	95	#ifdef CONFIG_ATARI_PARTITION
	96	atari_partition,
	97	#endif
	98	#ifdef CONFIG_MAC_PARTITION
	99	mac_partition,
	100	#endif
	101	#ifdef CONFIG_ULTRIX_PARTITION
	102	ultrix_partition,
	103	#endif
	104	#ifdef CONFIG_IBM_PARTITION
	105	ibm_partition,
0e6e1db4 BC	106	#endif
	107	#ifdef CONFIG_KARMA_PARTITION
	108	karma_partition,
1da177e4 LT	109	#endif
	110	NULL
	111	};
	112
	113	/*
	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).
	118	*/
	119
	120	char disk_name(struct gendisk hd, int part, char *buf)
	121	{
	122	if (!part)
	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);
	126	else
	127	snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
	128
	129	return buf;
	130	}
	131
	132	const char bdevname(struct block_device bdev, char *buf)
	133	{
	134	int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
	135	return disk_name(bdev->bd_disk, part, buf);
	136	}
	137
	138	EXPORT_SYMBOL(bdevname);
	139
	140	/*
	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.
	144	*/
	145	const char __bdevname(dev_t dev, char buffer)
	146	{
	147	scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
	148	MAJOR(dev), MINOR(dev));
	149	return buffer;
	150	}
	151
	152	EXPORT_SYMBOL(__bdevname);
	153
	154	static struct parsed_partitions *
	155	check_partition(struct gendisk hd, struct block_device bdev)
	156	{
	157	struct parsed_partitions *state;
	158	int i, res;
	159
	160	state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
	161	if (!state)
	162	return NULL;
	163
	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");
	168	}
	169	#endif
	170	else {
	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");
175	}
176	state->limit = hd->minors;
177	i = res = 0;
178	while (!res && check_part[i]) {
179	memset(&state->parts, 0, sizeof(state->parts));
180	res = check_part[i++](state, bdev);
181	}
182	if (res > 0)
183	return state;
184	if (!res)
185	printk(" unknown partition table\n");
186	else if (warn_no_part)
187	printk(" unable to read partition table\n");
188	kfree(state);
189	return NULL;
190	}
191
192	/*
193	* sysfs bindings for partitions
194	*/
195
196	struct part_attribute {
197	struct attribute attr;
198	ssize_t (show)(struct hd_struct ,char *);
a7fd6706	199	ssize_t (store)(struct hd_struct ,const char *, size_t);
1da177e4 LT	200	};
	201
	202	static ssize_t
	203	part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
	204	{
	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);
	207	ssize_t ret = 0;
	208	if (part_attr->show)
a7fd6706 KS	209	ret = part_attr->show(p, page);
	210	return ret;
	211	}
	212	static ssize_t
	213	part_attr_store(struct kobject * kobj, struct attribute * attr,
	214	const char *page, size_t count)
	215	{
	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);
	218	ssize_t ret = 0;
	219
	220	if (part_attr->store)
	221	ret = part_attr->store(p, page, count);
1da177e4 LT	222	return ret;
	223	}
	224
	225	static struct sysfs_ops part_sysfs_ops = {
	226	.show = part_attr_show,
a7fd6706	227	.store = part_attr_store,
1da177e4 LT	228	};
1da177e4 LT	229
a7fd6706 KS	230	static ssize_t part_uevent_store(struct hd_struct * p,
	231	const char *page, size_t count)
	232	{
312c004d	233	kobject_uevent(&p->kobj, KOBJ_ADD);
a7fd6706 KS	234	return count;
a7fd6706 KS	235	}
1da177e4 LT	236	static ssize_t part_dev_read(struct hd_struct * p, char *page)
	237	{
	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);
	241	}
	242	static ssize_t part_start_read(struct hd_struct * p, char *page)
	243	{
	244	return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
	245	}
	246	static ssize_t part_size_read(struct hd_struct * p, char *page)
	247	{
	248	return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
	249	}
	250	static ssize_t part_stat_read(struct hd_struct * p, char *page)
	251	{
	252	return sprintf(page, "%8u %8llu %8u %8llu\n",
a362357b JA	253	p->ios[0], (unsigned long long)p->sectors[0],
a362357b JA	254	p->ios[1], (unsigned long long)p->sectors[1]);
1da177e4	255	}
a7fd6706 KS	256	static struct part_attribute part_attr_uevent = {
	257	.attr = {.name = "uevent", .mode = S_IWUSR },
	258	.store = part_uevent_store
	259	};
1da177e4 LT	260	static struct part_attribute part_attr_dev = {
	261	.attr = {.name = "dev", .mode = S_IRUGO },
	262	.show = part_dev_read
	263	};
	264	static struct part_attribute part_attr_start = {
	265	.attr = {.name = "start", .mode = S_IRUGO },
	266	.show = part_start_read
	267	};
	268	static struct part_attribute part_attr_size = {
	269	.attr = {.name = "size", .mode = S_IRUGO },
	270	.show = part_size_read
	271	};
	272	static struct part_attribute part_attr_stat = {
	273	.attr = {.name = "stat", .mode = S_IRUGO },
	274	.show = part_stat_read
	275	};
	276
	277	static struct attribute * default_attrs[] = {
a7fd6706	278	&part_attr_uevent.attr,
1da177e4 LT	279	&part_attr_dev.attr,
	280	&part_attr_start.attr,
	281	&part_attr_size.attr,
	282	&part_attr_stat.attr,
	283	NULL,
	284	};
	285
	286	extern struct subsystem block_subsys;
	287
	288	static void part_release(struct kobject *kobj)
	289	{
	290	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	291	kfree(p);
	292	}
	293
	294	struct kobj_type ktype_part = {
	295	.release = part_release,
	296	.default_attrs = default_attrs,
	297	.sysfs_ops = &part_sysfs_ops,
	298	};
	299
6a4d44c1 JN	300	static inline void partition_sysfs_add_subdir(struct hd_struct *p)
	301	{
	302	struct kobject *k;
	303
	304	k = kobject_get(&p->kobj);
	305	p->holder_dir = kobject_add_dir(k, "holders");
	306	kobject_put(k);
	307	}
	308
	309	static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
	310	{
	311	struct kobject *k;
	312
	313	k = kobject_get(&disk->kobj);
	314	disk->holder_dir = kobject_add_dir(k, "holders");
	315	disk->slave_dir = kobject_add_dir(k, "slaves");
	316	kobject_put(k);
	317	}
6a4d44c1	318
1da177e4 LT	319	void delete_partition(struct gendisk *disk, int part)
	320	{
	321	struct hd_struct *p = disk->part[part-1];
	322	if (!p)
	323	return;
	324	if (!p->nr_sects)
	325	return;
	326	disk->part[part-1] = NULL;
	327	p->start_sect = 0;
	328	p->nr_sects = 0;
a362357b JA	329	p->ios[0] = p->ios[1] = 0;
a362357b JA	330	p->sectors[0] = p->sectors[1] = 0;
1da177e4	331	devfs_remove("%s/part%d", disk->devfs_name, part);
b9d9c82b	332	sysfs_remove_link(&p->kobj, "subsystem");
6a4d44c1 JN	333	if (p->holder_dir)
6a4d44c1 JN	334	kobject_unregister(p->holder_dir);
d4d7e5df KS	335	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	336	kobject_del(&p->kobj);
	337	kobject_put(&p->kobj);
1da177e4 LT	338	}
	339
	340	void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
	341	{
	342	struct hd_struct *p;
	343
	344	p = kmalloc(sizeof(*p), GFP_KERNEL);
	345	if (!p)
	346	return;
	347
	348	memset(p, 0, sizeof(*p));
	349	p->start_sect = start;
	350	p->nr_sects = len;
	351	p->partno = part;
	352
	353	devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
	354	S_IFBLK\|S_IRUSR\|S_IWUSR,
	355	"%s/part%d", disk->devfs_name, part);
	356
	357	if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
	358	snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,part);
	359	else
	360	snprintf(p->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
	361	p->kobj.parent = &disk->kobj;
	362	p->kobj.ktype = &ktype_part;
d4d7e5df KS	363	kobject_init(&p->kobj);
	364	kobject_add(&p->kobj);
	365	if (!disk->part_uevent_suppress)
	366	kobject_uevent(&p->kobj, KOBJ_ADD);
b9d9c82b	367	sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
6a4d44c1	368	partition_sysfs_add_subdir(p);
1da177e4 LT	369	disk->part[part-1] = p;
	370	}
	371
8218ef80 GKH	372	static char make_block_name(struct gendisk disk)
	373	{
	374	char *name;
	375	static char *block_str = "block:";
	376	int size;
2436f039	377	char *s;
8218ef80 GKH	378
	379	size = strlen(block_str) + strlen(disk->disk_name) + 1;
	380	name = kmalloc(size, GFP_KERNEL);
	381	if (!name)
	382	return NULL;
	383	strcpy(name, block_str);
	384	strcat(name, disk->disk_name);
2436f039 SR	385	/* ewww... some of these buggers have / in name... */
	386	s = strchr(name, '/');
	387	if (s)
	388	*s = '!';
8218ef80 GKH	389	return name;
	390	}
	391
1da177e4 LT	392	static void disk_sysfs_symlinks(struct gendisk *disk)
	393	{
	394	struct device *target = get_device(disk->driverfs_dev);
	395	if (target) {
8218ef80	396	char *disk_name = make_block_name(disk);
1da177e4	397	sysfs_create_link(&disk->kobj,&target->kobj,"device");
8218ef80 GKH	398	if (disk_name) {
	399	sysfs_create_link(&target->kobj,&disk->kobj,disk_name);
	400	kfree(disk_name);
	401	}
1da177e4	402	}
b9d9c82b	403	sysfs_create_link(&disk->kobj, &block_subsys.kset.kobj, "subsystem");
1da177e4 LT	404	}
	405
	406	/* Not exported, helper to add_disk(). */
	407	void register_disk(struct gendisk *disk)
	408	{
	409	struct block_device *bdev;
	410	char *s;
d4d7e5df KS	411	int i;
d4d7e5df KS	412	struct hd_struct *p;
1da177e4 LT	413	int err;
	414
	415	strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
	416	/* ewww... some of these buggers have / in name... */
	417	s = strchr(disk->kobj.name, '/');
	418	if (s)
	419	*s = '!';
	420	if ((err = kobject_add(&disk->kobj)))
	421	return;
	422	disk_sysfs_symlinks(disk);
6a4d44c1	423	disk_sysfs_add_subdirs(disk);
1da177e4 LT	424
	425	/* No minors to use for partitions */
	426	if (disk->minors == 1) {
	427	if (disk->devfs_name[0] != '\0')
	428	devfs_add_disk(disk);
d4d7e5df	429	goto exit;
1da177e4 LT	430	}
	431
	432	/* always add handle for the whole disk */
	433	devfs_add_partitioned(disk);
	434
	435	/* No such device (e.g., media were just removed) */
	436	if (!get_capacity(disk))
d4d7e5df	437	goto exit;
1da177e4 LT	438
	439	bdev = bdget_disk(disk, 0);
	440	if (!bdev)
d4d7e5df	441	goto exit;
1da177e4	442
d4d7e5df	443	/* scan partition table, but suppress uevents */
1da177e4	444	bdev->bd_invalidated = 1;
d4d7e5df KS	445	disk->part_uevent_suppress = 1;
	446	err = blkdev_get(bdev, FMODE_READ, 0);
	447	disk->part_uevent_suppress = 0;
	448	if (err < 0)
	449	goto exit;
1da177e4	450	blkdev_put(bdev);
d4d7e5df KS	451
	452	exit:
	453	/* announce disk after possible partitions are already created */
	454	kobject_uevent(&disk->kobj, KOBJ_ADD);
	455
	456	/* announce possible partitions */
	457	for (i = 1; i < disk->minors; i++) {
	458	p = disk->part[i-1];
	459	if (!p \|\| !p->nr_sects)
	460	continue;
	461	kobject_uevent(&p->kobj, KOBJ_ADD);
	462	}
1da177e4 LT	463	}
	464
	465	int rescan_partitions(struct gendisk disk, struct block_device bdev)
	466	{
	467	struct parsed_partitions *state;
	468	int p, res;
	469
	470	if (bdev->bd_part_count)
	471	return -EBUSY;
	472	res = invalidate_partition(disk, 0);
	473	if (res)
	474	return res;
	475	bdev->bd_invalidated = 0;
	476	for (p = 1; p < disk->minors; p++)
	477	delete_partition(disk, p);
	478	if (disk->fops->revalidate_disk)
	479	disk->fops->revalidate_disk(disk);
	480	if (!get_capacity(disk) \|\| !(state = check_partition(disk, bdev)))
	481	return 0;
	482	for (p = 1; p < state->limit; p++) {
	483	sector_t size = state->parts[p].size;
	484	sector_t from = state->parts[p].from;
	485	if (!size)
	486	continue;
	487	add_partition(disk, p, from, size);
	488	#ifdef CONFIG_BLK_DEV_MD
	489	if (state->parts[p].flags)
	490	md_autodetect_dev(bdev->bd_dev+p);
	491	#endif
	492	}
	493	kfree(state);
	494	return 0;
	495	}
	496
	497	unsigned char read_dev_sector(struct block_device bdev, sector_t n, Sector *p)
	498	{
	499	struct address_space *mapping = bdev->bd_inode->i_mapping;
	500	struct page *page;
	501
090d2b18 PE	502	page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
090d2b18 PE	503	NULL);
1da177e4 LT	504	if (!IS_ERR(page)) {
	505	wait_on_page_locked(page);
	506	if (!PageUptodate(page))
	507	goto fail;
	508	if (PageError(page))
	509	goto fail;
	510	p->v = page;
	511	return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
	512	fail:
	513	page_cache_release(page);
	514	}
	515	p->v = NULL;
	516	return NULL;
	517	}
	518
	519	EXPORT_SYMBOL(read_dev_sector);
	520
	521	void del_gendisk(struct gendisk *disk)
	522	{
	523	int p;
	524
	525	/* invalidate stuff */
	526	for (p = disk->minors - 1; p > 0; p--) {
	527	invalidate_partition(disk, p);
	528	delete_partition(disk, p);
	529	}
	530	invalidate_partition(disk, 0);
	531	disk->capacity = 0;
	532	disk->flags &= ~GENHD_FL_UP;
	533	unlink_gendisk(disk);
	534	disk_stat_set_all(disk, 0);
20e5c81f	535	disk->stamp = 0;
1da177e4 LT	536
	537	devfs_remove_disk(disk);
	538
032ebf26	539	kobject_uevent(&disk->kobj, KOBJ_REMOVE);
6a4d44c1 JN	540	if (disk->holder_dir)
	541	kobject_unregister(disk->holder_dir);
	542	if (disk->slave_dir)
	543	kobject_unregister(disk->slave_dir);
1da177e4	544	if (disk->driverfs_dev) {
8218ef80	545	char *disk_name = make_block_name(disk);
1da177e4	546	sysfs_remove_link(&disk->kobj, "device");
8218ef80 GKH	547	if (disk_name) {
	548	sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
	549	kfree(disk_name);
	550	}
1da177e4	551	put_device(disk->driverfs_dev);
032ebf26	552	disk->driverfs_dev = NULL;
1da177e4	553	}
b9d9c82b	554	sysfs_remove_link(&disk->kobj, "subsystem");
1da177e4 LT	555	kobject_del(&disk->kobj);
1da177e4 LT	556	}