[GitHub/mt8127/android_kernel_alcatel_ttab.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"
#include "sysv68.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
#ifdef CONFIG_SYSV68_PARTITION
	sysv68_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, err;

	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 = err = 0;
	while (!res && check_part[i]) {
		memset(&state->parts, 0, sizeof(state->parts));
		res = check_part[i++](state, bdev);
		if (res < 0) {
			/* We have hit an I/O error which we don't report now.
		 	* But record it, and let the others do their job.
		 	*/
			err = res;
			res = 0;
		}

	}
	if (res > 0)
		return state;
	if (err)
	/* The partition is unrecognized. So report I/O errors if there were any */
		res = err;
	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
};

#ifdef CONFIG_FAIL_MAKE_REQUEST

static ssize_t part_fail_store(struct hd_struct * p,
			       const char *buf, size_t count)
{
	int i;

	if (count > 0 && sscanf(buf, "%d", &i) > 0)
		p->make_it_fail = (i == 0) ? 0 : 1;

	return count;
}
static ssize_t part_fail_read(struct hd_struct * p, char *page)
{
	return sprintf(page, "%d\n", p->make_it_fail);
}
static struct part_attribute part_attr_fail = {
	.attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
	.store	= part_fail_store,
	.show	= part_fail_read
};

#endif

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,
#ifdef CONFIG_FAIL_MAKE_REQUEST
	&part_attr_fail.attr,
#endif
	NULL,
};

extern struct kset 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");
	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, int flags)
{
	struct hd_struct *p;

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

	if (isdigit(disk->kobj.k_name[strlen(disk->kobj.k_name)-1]))
		kobject_set_name(&p->kobj, "%sp%d",
				 kobject_name(&disk->kobj), part);
	else
		kobject_set_name(&p->kobj, "%s%d",
				 kobject_name(&disk->kobj),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.kobj, "subsystem");
	if (flags & ADDPART_FLAG_WHOLEDISK) {
		static struct attribute addpartattr = {
			.name = "whole_disk",
			.mode = S_IRUSR | S_IRGRP | S_IROTH,
		};

		sysfs_create_file(&p->kobj, &addpartattr);
	}
	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.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;

	kobject_set_name(&disk->kobj, "%s", disk->disk_name);
	/* ewww... some of these buggers have / in name... */
	s = strchr(disk->kobj.k_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 -EIO;
	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, state->parts[p].flags);
#ifdef CONFIG_BLK_DEV_MD
		if (state->parts[p].flags & ADDPART_FLAG_RAID)
			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)) {
		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);
	kobject_unregister(disk->holder_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"
19d0e8ce	37	#include "sysv68.h"
1da177e4 LT	38
	39	#ifdef CONFIG_BLK_DEV_MD
	40	extern void md_autodetect_dev(dev_t dev);
	41	#endif
	42
	43	int warn_no_part = 1; /This is ugly: should make genhd removable media aware/
	44
	45	static int (check_part[])(struct parsed_partitions , struct block_device *) = {
	46	/*
	47	* Probe partition formats with tables at disk address 0
	48	* that also have an ADFS boot block at 0xdc0.
	49	*/
	50	#ifdef CONFIG_ACORN_PARTITION_ICS
	51	adfspart_check_ICS,
	52	#endif
	53	#ifdef CONFIG_ACORN_PARTITION_POWERTEC
	54	adfspart_check_POWERTEC,
	55	#endif
	56	#ifdef CONFIG_ACORN_PARTITION_EESOX
	57	adfspart_check_EESOX,
	58	#endif
	59
	60	/*
	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
	64	* the msdos entry.
	65	*/
	66	#ifdef CONFIG_ACORN_PARTITION_CUMANA
	67	adfspart_check_CUMANA,
	68	#endif
	69	#ifdef CONFIG_ACORN_PARTITION_ADFS
	70	adfspart_check_ADFS,
	71	#endif
	72
	73	#ifdef CONFIG_EFI_PARTITION
	74	efi_partition, /* this must come before msdos */
	75	#endif
	76	#ifdef CONFIG_SGI_PARTITION
	77	sgi_partition,
	78	#endif
	79	#ifdef CONFIG_LDM_PARTITION
	80	ldm_partition, /* this must come before msdos */
	81	#endif
1da177e4 LT	82	#ifdef CONFIG_MSDOS_PARTITION
	83	msdos_partition,
	84	#endif
	85	#ifdef CONFIG_OSF_PARTITION
	86	osf_partition,
	87	#endif
	88	#ifdef CONFIG_SUN_PARTITION
	89	sun_partition,
	90	#endif
	91	#ifdef CONFIG_AMIGA_PARTITION
	92	amiga_partition,
	93	#endif
	94	#ifdef CONFIG_ATARI_PARTITION
	95	atari_partition,
	96	#endif
	97	#ifdef CONFIG_MAC_PARTITION
	98	mac_partition,
	99	#endif
	100	#ifdef CONFIG_ULTRIX_PARTITION
	101	ultrix_partition,
	102	#endif
	103	#ifdef CONFIG_IBM_PARTITION
	104	ibm_partition,
0e6e1db4 BC	105	#endif
	106	#ifdef CONFIG_KARMA_PARTITION
	107	karma_partition,
19d0e8ce PDM	108	#endif
	109	#ifdef CONFIG_SYSV68_PARTITION
	110	sysv68_partition,
1da177e4 LT	111	#endif
	112	NULL
	113	};
	114
	115	/*
	116	* disk_name() is used by partition check code and the genhd driver.
	117	* It formats the devicename of the indicated disk into
	118	* the supplied buffer (of size at least 32), and returns
	119	* a pointer to that same buffer (for convenience).
	120	*/
	121
	122	char disk_name(struct gendisk hd, int part, char *buf)
	123	{
	124	if (!part)
	125	snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
	126	else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
	127	snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
	128	else
	129	snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
	130
	131	return buf;
	132	}
	133
	134	const char bdevname(struct block_device bdev, char *buf)
	135	{
	136	int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
	137	return disk_name(bdev->bd_disk, part, buf);
	138	}
	139
	140	EXPORT_SYMBOL(bdevname);
	141
	142	/*
	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.
	146	*/
	147	const char __bdevname(dev_t dev, char buffer)
	148	{
	149	scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
	150	MAJOR(dev), MINOR(dev));
	151	return buffer;
	152	}
	153
	154	EXPORT_SYMBOL(__bdevname);
	155
	156	static struct parsed_partitions *
	157	check_partition(struct gendisk hd, struct block_device bdev)
	158	{
	159	struct parsed_partitions *state;
57881dd9	160	int i, res, err;
1da177e4 LT	161
	162	state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
	163	if (!state)
	164	return NULL;
	165
a2964188 GKH	166	disk_name(hd, 0, state->name);
	167	printk(KERN_INFO " %s:", state->name);
	168	if (isdigit(state->name[strlen(state->name)-1]))
1da177e4	169	sprintf(state->name, "p");
a2964188	170
1da177e4	171	state->limit = hd->minors;
57881dd9	172	i = res = err = 0;
1da177e4 LT	173	while (!res && check_part[i]) {
	174	memset(&state->parts, 0, sizeof(state->parts));
	175	res = check_part[i++](state, bdev);
57881dd9 S	176	if (res < 0) {
	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.
	179	*/
	180	err = res;
	181	res = 0;
	182	}
	183
1da177e4 LT	184	}
	185	if (res > 0)
	186	return state;
9bebff6c	187	if (err)
57881dd9 S	188	/* The partition is unrecognized. So report I/O errors if there were any */
57881dd9 S	189	res = err;
1da177e4 LT	190	if (!res)
	191	printk(" unknown partition table\n");
	192	else if (warn_no_part)
	193	printk(" unable to read partition table\n");
	194	kfree(state);
5127d002	195	return ERR_PTR(res);
1da177e4 LT	196	}
	197
	198	/*
	199	* sysfs bindings for partitions
	200	*/
	201
	202	struct part_attribute {
	203	struct attribute attr;
	204	ssize_t (show)(struct hd_struct ,char *);
a7fd6706	205	ssize_t (store)(struct hd_struct ,const char *, size_t);
1da177e4 LT	206	};
	207
	208	static ssize_t
	209	part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
	210	{
	211	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	212	struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
	213	ssize_t ret = 0;
	214	if (part_attr->show)
a7fd6706 KS	215	ret = part_attr->show(p, page);
	216	return ret;
	217	}
	218	static ssize_t
	219	part_attr_store(struct kobject * kobj, struct attribute * attr,
	220	const char *page, size_t count)
	221	{
	222	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	223	struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
	224	ssize_t ret = 0;
	225
	226	if (part_attr->store)
	227	ret = part_attr->store(p, page, count);
1da177e4 LT	228	return ret;
	229	}
	230
	231	static struct sysfs_ops part_sysfs_ops = {
	232	.show = part_attr_show,
a7fd6706	233	.store = part_attr_store,
1da177e4 LT	234	};
1da177e4 LT	235
a7fd6706 KS	236	static ssize_t part_uevent_store(struct hd_struct * p,
	237	const char *page, size_t count)
	238	{
312c004d	239	kobject_uevent(&p->kobj, KOBJ_ADD);
a7fd6706 KS	240	return count;
a7fd6706 KS	241	}
1da177e4 LT	242	static ssize_t part_dev_read(struct hd_struct * p, char *page)
	243	{
	244	struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
	245	dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno);
	246	return print_dev_t(page, dev);
	247	}
	248	static ssize_t part_start_read(struct hd_struct * p, char *page)
	249	{
	250	return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
	251	}
	252	static ssize_t part_size_read(struct hd_struct * p, char *page)
	253	{
	254	return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
	255	}
	256	static ssize_t part_stat_read(struct hd_struct * p, char *page)
	257	{
	258	return sprintf(page, "%8u %8llu %8u %8llu\n",
a362357b JA	259	p->ios[0], (unsigned long long)p->sectors[0],
a362357b JA	260	p->ios[1], (unsigned long long)p->sectors[1]);
1da177e4	261	}
a7fd6706 KS	262	static struct part_attribute part_attr_uevent = {
	263	.attr = {.name = "uevent", .mode = S_IWUSR },
	264	.store = part_uevent_store
	265	};
1da177e4 LT	266	static struct part_attribute part_attr_dev = {
	267	.attr = {.name = "dev", .mode = S_IRUGO },
	268	.show = part_dev_read
	269	};
	270	static struct part_attribute part_attr_start = {
	271	.attr = {.name = "start", .mode = S_IRUGO },
	272	.show = part_start_read
	273	};
	274	static struct part_attribute part_attr_size = {
	275	.attr = {.name = "size", .mode = S_IRUGO },
	276	.show = part_size_read
	277	};
	278	static struct part_attribute part_attr_stat = {
	279	.attr = {.name = "stat", .mode = S_IRUGO },
	280	.show = part_stat_read
	281	};
	282
c17bb495 AM	283	#ifdef CONFIG_FAIL_MAKE_REQUEST
	284
	285	static ssize_t part_fail_store(struct hd_struct * p,
	286	const char *buf, size_t count)
	287	{
	288	int i;
	289
	290	if (count > 0 && sscanf(buf, "%d", &i) > 0)
	291	p->make_it_fail = (i == 0) ? 0 : 1;
	292
	293	return count;
	294	}
	295	static ssize_t part_fail_read(struct hd_struct * p, char *page)
	296	{
	297	return sprintf(page, "%d\n", p->make_it_fail);
	298	}
	299	static struct part_attribute part_attr_fail = {
	300	.attr = {.name = "make-it-fail", .mode = S_IRUGO \| S_IWUSR },
	301	.store = part_fail_store,
	302	.show = part_fail_read
	303	};
	304
	305	#endif
	306
1da177e4	307	static struct attribute * default_attrs[] = {
a7fd6706	308	&part_attr_uevent.attr,
1da177e4 LT	309	&part_attr_dev.attr,
	310	&part_attr_start.attr,
	311	&part_attr_size.attr,
	312	&part_attr_stat.attr,
c17bb495 AM	313	#ifdef CONFIG_FAIL_MAKE_REQUEST
	314	&part_attr_fail.attr,
	315	#endif
1da177e4 LT	316	NULL,
	317	};
	318
823bccfc	319	extern struct kset block_subsys;
1da177e4 LT	320
	321	static void part_release(struct kobject *kobj)
	322	{
	323	struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
	324	kfree(p);
	325	}
	326
	327	struct kobj_type ktype_part = {
	328	.release = part_release,
	329	.default_attrs = default_attrs,
	330	.sysfs_ops = &part_sysfs_ops,
	331	};
	332
6a4d44c1 JN	333	static inline void partition_sysfs_add_subdir(struct hd_struct *p)
	334	{
	335	struct kobject *k;
	336
	337	k = kobject_get(&p->kobj);
	338	p->holder_dir = kobject_add_dir(k, "holders");
	339	kobject_put(k);
	340	}
	341
	342	static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
	343	{
	344	struct kobject *k;
	345
	346	k = kobject_get(&disk->kobj);
	347	disk->holder_dir = kobject_add_dir(k, "holders");
	348	disk->slave_dir = kobject_add_dir(k, "slaves");
	349	kobject_put(k);
	350	}
6a4d44c1	351
1da177e4 LT	352	void delete_partition(struct gendisk *disk, int part)
	353	{
	354	struct hd_struct *p = disk->part[part-1];
	355	if (!p)
	356	return;
	357	if (!p->nr_sects)
	358	return;
	359	disk->part[part-1] = NULL;
	360	p->start_sect = 0;
	361	p->nr_sects = 0;
a362357b JA	362	p->ios[0] = p->ios[1] = 0;
a362357b JA	363	p->sectors[0] = p->sectors[1] = 0;
b9d9c82b	364	sysfs_remove_link(&p->kobj, "subsystem");
b92be9f1	365	kobject_unregister(p->holder_dir);
d4d7e5df KS	366	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	367	kobject_del(&p->kobj);
	368	kobject_put(&p->kobj);
1da177e4 LT	369	}
1da177e4 LT	370
d18d7682	371	void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
1da177e4 LT	372	{
	373	struct hd_struct *p;
	374
dd00cc48	375	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	376	if (!p)
	377	return;
	378
1da177e4 LT	379	p->start_sect = start;
	380	p->nr_sects = len;
	381	p->partno = part;
25e206b5	382	p->policy = disk->policy;
1da177e4	383
19c38de8 GKH	384	if (isdigit(disk->kobj.k_name[strlen(disk->kobj.k_name)-1]))
	385	kobject_set_name(&p->kobj, "%sp%d",
	386	kobject_name(&disk->kobj), part);
1da177e4	387	else
19c38de8 GKH	388	kobject_set_name(&p->kobj, "%s%d",
19c38de8 GKH	389	kobject_name(&disk->kobj),part);
1da177e4 LT	390	p->kobj.parent = &disk->kobj;
1da177e4 LT	391	p->kobj.ktype = &ktype_part;
d4d7e5df KS	392	kobject_init(&p->kobj);
	393	kobject_add(&p->kobj);
	394	if (!disk->part_uevent_suppress)
	395	kobject_uevent(&p->kobj, KOBJ_ADD);
823bccfc	396	sysfs_create_link(&p->kobj, &block_subsys.kobj, "subsystem");
d18d7682 FMDN	397	if (flags & ADDPART_FLAG_WHOLEDISK) {
	398	static struct attribute addpartattr = {
	399	.name = "whole_disk",
	400	.mode = S_IRUSR \| S_IRGRP \| S_IROTH,
d18d7682 FMDN	401	};
	402
	403	sysfs_create_file(&p->kobj, &addpartattr);
	404	}
6a4d44c1	405	partition_sysfs_add_subdir(p);
1da177e4 LT	406	disk->part[part-1] = p;
	407	}
	408
8218ef80 GKH	409	static char make_block_name(struct gendisk disk)
	410	{
	411	char *name;
	412	static char *block_str = "block:";
	413	int size;
2436f039	414	char *s;
8218ef80 GKH	415
	416	size = strlen(block_str) + strlen(disk->disk_name) + 1;
	417	name = kmalloc(size, GFP_KERNEL);
	418	if (!name)
	419	return NULL;
	420	strcpy(name, block_str);
	421	strcat(name, disk->disk_name);
2436f039 SR	422	/* ewww... some of these buggers have / in name... */
	423	s = strchr(name, '/');
	424	if (s)
	425	*s = '!';
8218ef80 GKH	426	return name;
	427	}
	428
eee44cca	429	static int disk_sysfs_symlinks(struct gendisk *disk)
1da177e4 LT	430	{
1da177e4 LT	431	struct device *target = get_device(disk->driverfs_dev);
eee44cca JG	432	int err;
	433	char *disk_name = NULL;
	434
1da177e4	435	if (target) {
eee44cca JG	436	disk_name = make_block_name(disk);
	437	if (!disk_name) {
	438	err = -ENOMEM;
	439	goto err_out;
8218ef80	440	}
eee44cca JG	441
	442	err = sysfs_create_link(&disk->kobj, &target->kobj, "device");
	443	if (err)
	444	goto err_out_disk_name;
	445
	446	err = sysfs_create_link(&target->kobj, &disk->kobj, disk_name);
	447	if (err)
	448	goto err_out_dev_link;
	449	}
	450
823bccfc	451	err = sysfs_create_link(&disk->kobj, &block_subsys.kobj,
eee44cca JG	452	"subsystem");
	453	if (err)
	454	goto err_out_disk_name_lnk;
	455
	456	kfree(disk_name);
	457
	458	return 0;
	459
	460	err_out_disk_name_lnk:
	461	if (target) {
	462	sysfs_remove_link(&target->kobj, disk_name);
	463	err_out_dev_link:
	464	sysfs_remove_link(&disk->kobj, "device");
	465	err_out_disk_name:
	466	kfree(disk_name);
	467	err_out:
	468	put_device(target);
1da177e4	469	}
eee44cca	470	return err;
1da177e4 LT	471	}
	472
	473	/* Not exported, helper to add_disk(). */
	474	void register_disk(struct gendisk *disk)
	475	{
	476	struct block_device *bdev;
	477	char *s;
d4d7e5df KS	478	int i;
d4d7e5df KS	479	struct hd_struct *p;
1da177e4 LT	480	int err;
1da177e4 LT	481
19c38de8	482	kobject_set_name(&disk->kobj, "%s", disk->disk_name);
1da177e4	483	/* ewww... some of these buggers have / in name... */
19c38de8	484	s = strchr(disk->kobj.k_name, '/');
1da177e4 LT	485	if (s)
	486	*s = '!';
	487	if ((err = kobject_add(&disk->kobj)))
	488	return;
eee44cca JG	489	err = disk_sysfs_symlinks(disk);
	490	if (err) {
	491	kobject_del(&disk->kobj);
	492	return;
	493	}
6a4d44c1	494	disk_sysfs_add_subdirs(disk);
1da177e4 LT	495
1da177e4 LT	496	/* No minors to use for partitions */
a2964188	497	if (disk->minors == 1)
d4d7e5df	498	goto exit;
1da177e4 LT	499
	500	/* No such device (e.g., media were just removed) */
	501	if (!get_capacity(disk))
d4d7e5df	502	goto exit;
1da177e4 LT	503
	504	bdev = bdget_disk(disk, 0);
	505	if (!bdev)
d4d7e5df	506	goto exit;
1da177e4	507
d4d7e5df	508	/* scan partition table, but suppress uevents */
1da177e4	509	bdev->bd_invalidated = 1;
d4d7e5df KS	510	disk->part_uevent_suppress = 1;
	511	err = blkdev_get(bdev, FMODE_READ, 0);
	512	disk->part_uevent_suppress = 0;
	513	if (err < 0)
	514	goto exit;
1da177e4	515	blkdev_put(bdev);
d4d7e5df KS	516
	517	exit:
	518	/* announce disk after possible partitions are already created */
	519	kobject_uevent(&disk->kobj, KOBJ_ADD);
	520
	521	/* announce possible partitions */
	522	for (i = 1; i < disk->minors; i++) {
	523	p = disk->part[i-1];
	524	if (!p \|\| !p->nr_sects)
	525	continue;
	526	kobject_uevent(&p->kobj, KOBJ_ADD);
	527	}
1da177e4 LT	528	}
	529
	530	int rescan_partitions(struct gendisk disk, struct block_device bdev)
	531	{
	532	struct parsed_partitions *state;
	533	int p, res;
	534
	535	if (bdev->bd_part_count)
	536	return -EBUSY;
	537	res = invalidate_partition(disk, 0);
	538	if (res)
	539	return res;
	540	bdev->bd_invalidated = 0;
	541	for (p = 1; p < disk->minors; p++)
	542	delete_partition(disk, p);
	543	if (disk->fops->revalidate_disk)
	544	disk->fops->revalidate_disk(disk);
	545	if (!get_capacity(disk) \|\| !(state = check_partition(disk, bdev)))
	546	return 0;
5127d002	547	if (IS_ERR(state)) /* I/O error reading the partition table */
b74a2f09	548	return -EIO;
1da177e4 LT	549	for (p = 1; p < state->limit; p++) {
	550	sector_t size = state->parts[p].size;
	551	sector_t from = state->parts[p].from;
	552	if (!size)
	553	continue;
98bd34ea MM	554	if (from + size > get_capacity(disk)) {
	555	printk(" %s: p%d exceeds device capacity\n",
	556	disk->disk_name, p);
	557	}
d18d7682	558	add_partition(disk, p, from, size, state->parts[p].flags);
1da177e4	559	#ifdef CONFIG_BLK_DEV_MD
d18d7682	560	if (state->parts[p].flags & ADDPART_FLAG_RAID)
1da177e4 LT	561	md_autodetect_dev(bdev->bd_dev+p);
	562	#endif
	563	}
	564	kfree(state);
	565	return 0;
	566	}
	567
	568	unsigned char read_dev_sector(struct block_device bdev, sector_t n, Sector *p)
	569	{
	570	struct address_space *mapping = bdev->bd_inode->i_mapping;
	571	struct page *page;
	572
090d2b18 PE	573	page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
090d2b18 PE	574	NULL);
1da177e4	575	if (!IS_ERR(page)) {
1da177e4 LT	576	if (PageError(page))
	577	goto fail;
	578	p->v = page;
	579	return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
	580	fail:
	581	page_cache_release(page);
	582	}
	583	p->v = NULL;
	584	return NULL;
	585	}
	586
	587	EXPORT_SYMBOL(read_dev_sector);
	588
	589	void del_gendisk(struct gendisk *disk)
	590	{
	591	int p;
	592
	593	/* invalidate stuff */
	594	for (p = disk->minors - 1; p > 0; p--) {
	595	invalidate_partition(disk, p);
	596	delete_partition(disk, p);
	597	}
	598	invalidate_partition(disk, 0);
	599	disk->capacity = 0;
	600	disk->flags &= ~GENHD_FL_UP;
	601	unlink_gendisk(disk);
	602	disk_stat_set_all(disk, 0);
20e5c81f	603	disk->stamp = 0;
1da177e4	604
032ebf26	605	kobject_uevent(&disk->kobj, KOBJ_REMOVE);
b92be9f1 MK	606	kobject_unregister(disk->holder_dir);
b92be9f1 MK	607	kobject_unregister(disk->slave_dir);
1da177e4	608	if (disk->driverfs_dev) {
8218ef80	609	char *disk_name = make_block_name(disk);
1da177e4	610	sysfs_remove_link(&disk->kobj, "device");
8218ef80 GKH	611	if (disk_name) {
	612	sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
	613	kfree(disk_name);
	614	}
1da177e4	615	put_device(disk->driverfs_dev);
032ebf26	616	disk->driverfs_dev = NULL;
1da177e4	617	}
b9d9c82b	618	sysfs_remove_link(&disk->kobj, "subsystem");
1da177e4 LT	619	kobject_del(&disk->kobj);
1da177e4 LT	620	}