[deliverable/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/genhd.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);
}

static ssize_t part_start_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct hd_struct *p = dev_to_part(dev);

	return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
}

static ssize_t part_size_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct hd_struct *p = dev_to_part(dev);
	return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
}

static ssize_t part_stat_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct hd_struct *p = dev_to_part(dev);

	preempt_disable();
	part_round_stats(p);
	preempt_enable();
	return sprintf(buf,
		"%8lu %8lu %8llu %8u "
		"%8lu %8lu %8llu %8u "
		"%8u %8u %8u"
		"\n",
		part_stat_read(p, ios[READ]),
		part_stat_read(p, merges[READ]),
		(unsigned long long)part_stat_read(p, sectors[READ]),
		jiffies_to_msecs(part_stat_read(p, ticks[READ])),
		part_stat_read(p, ios[WRITE]),
		part_stat_read(p, merges[WRITE]),
		(unsigned long long)part_stat_read(p, sectors[WRITE]),
		jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
		p->in_flight,
		jiffies_to_msecs(part_stat_read(p, io_ticks)),
		jiffies_to_msecs(part_stat_read(p, time_in_queue)));
}

#ifdef CONFIG_FAIL_MAKE_REQUEST
static ssize_t part_fail_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct hd_struct *p = dev_to_part(dev);

	return sprintf(buf, "%d\n", p->make_it_fail);
}

static ssize_t part_fail_store(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf, size_t count)
{
	struct hd_struct *p = dev_to_part(dev);
	int i;

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

	return count;
}
#endif

static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
#ifdef CONFIG_FAIL_MAKE_REQUEST
static struct device_attribute dev_attr_fail =
	__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
#endif

static struct attribute *part_attrs[] = {
	&dev_attr_start.attr,
	&dev_attr_size.attr,
	&dev_attr_stat.attr,
#ifdef CONFIG_FAIL_MAKE_REQUEST
	&dev_attr_fail.attr,
#endif
	NULL
};

static struct attribute_group part_attr_group = {
	.attrs = part_attrs,
};

static struct attribute_group *part_attr_groups[] = {
	&part_attr_group,
	NULL
};

static void part_release(struct device *dev)
{
	struct hd_struct *p = dev_to_part(dev);
	free_part_stats(p);
	kfree(p);
}

struct device_type part_type = {
	.name		= "partition",
	.groups		= part_attr_groups,
	.release	= part_release,
};

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

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

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

	k = kobject_get(&disk->dev.kobj);
	disk->holder_dir = kobject_create_and_add("holders", k);
	disk->slave_dir = kobject_create_and_add("slaves", k);
	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;
	part_stat_set_all(p, 0);
	kobject_put(p->holder_dir);
	device_del(&p->dev);
	put_device(&p->dev);
}

static ssize_t whole_disk_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	return 0;
}
static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
		   whole_disk_show, NULL);

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

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return;

	if (!init_part_stats(p)) {
		kfree(p);
		return;
	}
	p->start_sect = start;
	p->nr_sects = len;
	p->partno = part;
	p->policy = disk->policy;

	if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
		snprintf(p->dev.bus_id, BUS_ID_SIZE,
		"%sp%d", disk->dev.bus_id, part);
	else
		snprintf(p->dev.bus_id, BUS_ID_SIZE,
			 "%s%d", disk->dev.bus_id, part);

	device_initialize(&p->dev);
	p->dev.devt = MKDEV(disk->major, disk->first_minor + part);
	p->dev.class = &block_class;
	p->dev.type = &part_type;
	p->dev.parent = &disk->dev;
	disk->part[part-1] = p;

	/* delay uevent until 'holders' subdir is created */
	p->dev.uevent_suppress = 1;
	device_add(&p->dev);
	partition_sysfs_add_subdir(p);
	p->dev.uevent_suppress = 0;
	if (flags & ADDPART_FLAG_WHOLEDISK)
		err = device_create_file(&p->dev, &dev_attr_whole_disk);

	/* suppress uevent if the disk supresses it */
	if (!disk->dev.uevent_suppress)
		kobject_uevent(&p->dev.kobj, KOBJ_ADD);
}

/* 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;

	disk->dev.parent = disk->driverfs_dev;
	disk->dev.devt = MKDEV(disk->major, disk->first_minor);

	strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
	/* ewww... some of these buggers have / in the name... */
	s = strchr(disk->dev.bus_id, '/');
	if (s)
		*s = '!';

	/* delay uevents, until we scanned partition table */
	disk->dev.uevent_suppress = 1;

	if (device_add(&disk->dev))
		return;
#ifndef CONFIG_SYSFS_DEPRECATED
	err = sysfs_create_link(block_depr, &disk->dev.kobj,
				kobject_name(&disk->dev.kobj));
	if (err) {
		device_del(&disk->dev);
		return;
	}
#endif
	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;

	bdev->bd_invalidated = 1;
	err = blkdev_get(bdev, FMODE_READ, 0);
	if (err < 0)
		goto exit;
	blkdev_put(bdev);

exit:
	/* announce disk after possible partitions are created */
	disk->dev.uevent_suppress = 0;
	kobject_uevent(&disk->dev.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->dev.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;

	/* tell userspace that the media / partition table may have changed */
	kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);

	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_put(disk->holder_dir);
	kobject_put(disk->slave_dir);
	disk->driverfs_dev = NULL;
#ifndef CONFIG_SYSFS_DEPRECATED
	sysfs_remove_link(block_depr, disk->dev.bus_id);
#endif
	device_del(&disk->dev);
}
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>
6f2576af	21	#include <linux/genhd.h>
1da177e4 LT	22
1da177e4 LT	23	#include "check.h"
1da177e4 LT	24
	25	#include "acorn.h"
	26	#include "amiga.h"
	27	#include "atari.h"
	28	#include "ldm.h"
	29	#include "mac.h"
	30	#include "msdos.h"
	31	#include "osf.h"
	32	#include "sgi.h"
	33	#include "sun.h"
	34	#include "ibm.h"
	35	#include "ultrix.h"
	36	#include "efi.h"
0e6e1db4	37	#include "karma.h"
19d0e8ce	38	#include "sysv68.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,
19d0e8ce PDM	109	#endif
	110	#ifdef CONFIG_SYSV68_PARTITION
	111	sysv68_partition,
1da177e4 LT	112	#endif
	113	NULL
	114	};
	115
	116	/*
	117	* disk_name() is used by partition check code and the genhd driver.
	118	* It formats the devicename of the indicated disk into
	119	* the supplied buffer (of size at least 32), and returns
	120	* a pointer to that same buffer (for convenience).
	121	*/
	122
	123	char disk_name(struct gendisk hd, int part, char *buf)
	124	{
	125	if (!part)
	126	snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
	127	else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
	128	snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
	129	else
	130	snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
	131
	132	return buf;
	133	}
	134
	135	const char bdevname(struct block_device bdev, char *buf)
	136	{
	137	int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
	138	return disk_name(bdev->bd_disk, part, buf);
	139	}
	140
	141	EXPORT_SYMBOL(bdevname);
	142
	143	/*
	144	* There's very little reason to use this, you should really
	145	* have a struct block_device just about everywhere and use
	146	* bdevname() instead.
	147	*/
	148	const char __bdevname(dev_t dev, char buffer)
	149	{
	150	scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
	151	MAJOR(dev), MINOR(dev));
	152	return buffer;
	153	}
	154
	155	EXPORT_SYMBOL(__bdevname);
	156
	157	static struct parsed_partitions *
	158	check_partition(struct gendisk hd, struct block_device bdev)
	159	{
	160	struct parsed_partitions *state;
57881dd9	161	int i, res, err;
1da177e4 LT	162
	163	state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
	164	if (!state)
	165	return NULL;
	166
a2964188 GKH	167	disk_name(hd, 0, state->name);
	168	printk(KERN_INFO " %s:", state->name);
	169	if (isdigit(state->name[strlen(state->name)-1]))
1da177e4	170	sprintf(state->name, "p");
a2964188	171
1da177e4	172	state->limit = hd->minors;
57881dd9	173	i = res = err = 0;
1da177e4 LT	174	while (!res && check_part[i]) {
	175	memset(&state->parts, 0, sizeof(state->parts));
	176	res = check_part[i++](state, bdev);
57881dd9 S	177	if (res < 0) {
	178	/* We have hit an I/O error which we don't report now.
	179	* But record it, and let the others do their job.
	180	*/
	181	err = res;
	182	res = 0;
	183	}
	184
1da177e4 LT	185	}
	186	if (res > 0)
	187	return state;
9bebff6c	188	if (err)
57881dd9 S	189	/* The partition is unrecognized. So report I/O errors if there were any */
57881dd9 S	190	res = err;
1da177e4 LT	191	if (!res)
	192	printk(" unknown partition table\n");
	193	else if (warn_no_part)
	194	printk(" unable to read partition table\n");
	195	kfree(state);
5127d002	196	return ERR_PTR(res);
1da177e4 LT	197	}
1da177e4 LT	198
edfaa7c3 KS	199	static ssize_t part_start_show(struct device *dev,
edfaa7c3 KS	200	struct device_attribute attr, char buf)
1da177e4	201	{
edfaa7c3	202	struct hd_struct *p = dev_to_part(dev);
a7fd6706	203
edfaa7c3	204	return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
1da177e4 LT	205	}
1da177e4 LT	206
edfaa7c3 KS	207	static ssize_t part_size_show(struct device *dev,
edfaa7c3 KS	208	struct device_attribute attr, char buf)
a7fd6706	209	{
edfaa7c3 KS	210	struct hd_struct *p = dev_to_part(dev);
edfaa7c3 KS	211	return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
a7fd6706	212	}
edfaa7c3 KS	213
	214	static ssize_t part_stat_show(struct device *dev,
	215	struct device_attribute attr, char buf)
1da177e4	216	{
edfaa7c3 KS	217	struct hd_struct *p = dev_to_part(dev);
edfaa7c3 KS	218
34e8beac JM	219	preempt_disable();
	220	part_round_stats(p);
	221	preempt_enable();
	222	return sprintf(buf,
	223	"%8lu %8lu %8llu %8u "
	224	"%8lu %8lu %8llu %8u "
	225	"%8u %8u %8u"
	226	"\n",
	227	part_stat_read(p, ios[READ]),
	228	part_stat_read(p, merges[READ]),
	229	(unsigned long long)part_stat_read(p, sectors[READ]),
	230	jiffies_to_msecs(part_stat_read(p, ticks[READ])),
	231	part_stat_read(p, ios[WRITE]),
	232	part_stat_read(p, merges[WRITE]),
	233	(unsigned long long)part_stat_read(p, sectors[WRITE]),
	234	jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
	235	p->in_flight,
	236	jiffies_to_msecs(part_stat_read(p, io_ticks)),
	237	jiffies_to_msecs(part_stat_read(p, time_in_queue)));
1da177e4	238	}
1da177e4	239
c17bb495	240	#ifdef CONFIG_FAIL_MAKE_REQUEST
edfaa7c3 KS	241	static ssize_t part_fail_show(struct device *dev,
	242	struct device_attribute attr, char buf)
	243	{
	244	struct hd_struct *p = dev_to_part(dev);
c17bb495	245
edfaa7c3 KS	246	return sprintf(buf, "%d\n", p->make_it_fail);
	247	}
	248
	249	static ssize_t part_fail_store(struct device *dev,
	250	struct device_attribute *attr,
c17bb495 AM	251	const char *buf, size_t count)
c17bb495 AM	252	{
edfaa7c3	253	struct hd_struct *p = dev_to_part(dev);
c17bb495 AM	254	int i;
	255
	256	if (count > 0 && sscanf(buf, "%d", &i) > 0)
	257	p->make_it_fail = (i == 0) ? 0 : 1;
	258
	259	return count;
	260	}
edfaa7c3	261	#endif
c17bb495	262
edfaa7c3 KS	263	static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
	264	static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
	265	static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
	266	#ifdef CONFIG_FAIL_MAKE_REQUEST
	267	static struct device_attribute dev_attr_fail =
	268	__ATTR(make-it-fail, S_IRUGO\|S_IWUSR, part_fail_show, part_fail_store);
c17bb495 AM	269	#endif
c17bb495 AM	270
edfaa7c3 KS	271	static struct attribute *part_attrs[] = {
	272	&dev_attr_start.attr,
	273	&dev_attr_size.attr,
	274	&dev_attr_stat.attr,
c17bb495	275	#ifdef CONFIG_FAIL_MAKE_REQUEST
edfaa7c3	276	&dev_attr_fail.attr,
c17bb495	277	#endif
edfaa7c3	278	NULL
1da177e4 LT	279	};
1da177e4 LT	280
edfaa7c3 KS	281	static struct attribute_group part_attr_group = {
	282	.attrs = part_attrs,
	283	};
1da177e4	284
edfaa7c3 KS	285	static struct attribute_group *part_attr_groups[] = {
	286	&part_attr_group,
	287	NULL
	288	};
	289
	290	static void part_release(struct device *dev)
1da177e4	291	{
edfaa7c3	292	struct hd_struct *p = dev_to_part(dev);
6f2576af	293	free_part_stats(p);
1da177e4 LT	294	kfree(p);
	295	}
	296
edfaa7c3 KS	297	struct device_type part_type = {
	298	.name = "partition",
	299	.groups = part_attr_groups,
1da177e4	300	.release = part_release,
1da177e4 LT	301	};
1da177e4 LT	302
6a4d44c1 JN	303	static inline void partition_sysfs_add_subdir(struct hd_struct *p)
	304	{
	305	struct kobject *k;
	306
edfaa7c3	307	k = kobject_get(&p->dev.kobj);
4ff6abff	308	p->holder_dir = kobject_create_and_add("holders", k);
6a4d44c1 JN	309	kobject_put(k);
	310	}
	311
	312	static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
	313	{
	314	struct kobject *k;
	315
edfaa7c3	316	k = kobject_get(&disk->dev.kobj);
4ff6abff GKH	317	disk->holder_dir = kobject_create_and_add("holders", k);
4ff6abff GKH	318	disk->slave_dir = kobject_create_and_add("slaves", k);
6a4d44c1 JN	319	kobject_put(k);
6a4d44c1 JN	320	}
6a4d44c1	321
1da177e4 LT	322	void delete_partition(struct gendisk *disk, int part)
	323	{
	324	struct hd_struct *p = disk->part[part-1];
edfaa7c3	325
1da177e4 LT	326	if (!p)
	327	return;
	328	if (!p->nr_sects)
	329	return;
	330	disk->part[part-1] = NULL;
	331	p->start_sect = 0;
	332	p->nr_sects = 0;
6f2576af	333	part_stat_set_all(p, 0);
197b12d6	334	kobject_put(p->holder_dir);
edfaa7c3 KS	335	device_del(&p->dev);
edfaa7c3 KS	336	put_device(&p->dev);
1da177e4 LT	337	}
1da177e4 LT	338
f4a00a2c GKH	339	static ssize_t whole_disk_show(struct device *dev,
	340	struct device_attribute attr, char buf)
	341	{
	342	return 0;
	343	}
	344	static DEVICE_ATTR(whole_disk, S_IRUSR \| S_IRGRP \| S_IROTH,
	345	whole_disk_show, NULL);
	346
d18d7682	347	void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
1da177e4 LT	348	{
1da177e4 LT	349	struct hd_struct *p;
edfaa7c3	350	int err;
1da177e4	351
dd00cc48	352	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	353	if (!p)
1da177e4 LT	354	return;
edfaa7c3	355
6f2576af JM	356	if (!init_part_stats(p)) {
	357	kfree(p);
	358	return;
	359	}
1da177e4 LT	360	p->start_sect = start;
	361	p->nr_sects = len;
	362	p->partno = part;
25e206b5	363	p->policy = disk->policy;
1da177e4	364
edfaa7c3 KS	365	if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
	366	snprintf(p->dev.bus_id, BUS_ID_SIZE,
	367	"%sp%d", disk->dev.bus_id, part);
1da177e4	368	else
edfaa7c3 KS	369	snprintf(p->dev.bus_id, BUS_ID_SIZE,
	370	"%s%d", disk->dev.bus_id, part);
	371
	372	device_initialize(&p->dev);
	373	p->dev.devt = MKDEV(disk->major, disk->first_minor + part);
	374	p->dev.class = &block_class;
	375	p->dev.type = &part_type;
	376	p->dev.parent = &disk->dev;
	377	disk->part[part-1] = p;
	378
	379	/* delay uevent until 'holders' subdir is created */
	380	p->dev.uevent_suppress = 1;
	381	device_add(&p->dev);
	382	partition_sysfs_add_subdir(p);
	383	p->dev.uevent_suppress = 0;
f4a00a2c GKH	384	if (flags & ADDPART_FLAG_WHOLEDISK)
f4a00a2c GKH	385	err = device_create_file(&p->dev, &dev_attr_whole_disk);
1da177e4	386
edfaa7c3 KS	387	/* suppress uevent if the disk supresses it */
	388	if (!disk->dev.uevent_suppress)
	389	kobject_uevent(&p->dev.kobj, KOBJ_ADD);
1da177e4 LT	390	}
	391
	392	/* Not exported, helper to add_disk(). */
	393	void register_disk(struct gendisk *disk)
	394	{
	395	struct block_device *bdev;
	396	char *s;
d4d7e5df KS	397	int i;
d4d7e5df KS	398	struct hd_struct *p;
1da177e4 LT	399	int err;
1da177e4 LT	400
edfaa7c3 KS	401	disk->dev.parent = disk->driverfs_dev;
	402	disk->dev.devt = MKDEV(disk->major, disk->first_minor);
	403
aab0de24	404	strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
edfaa7c3 KS	405	/* ewww... some of these buggers have / in the name... */
edfaa7c3 KS	406	s = strchr(disk->dev.bus_id, '/');
1da177e4 LT	407	if (s)
1da177e4 LT	408	*s = '!';
edfaa7c3 KS	409
	410	/* delay uevents, until we scanned partition table */
	411	disk->dev.uevent_suppress = 1;
	412
	413	if (device_add(&disk->dev))
1da177e4	414	return;
edfaa7c3 KS	415	#ifndef CONFIG_SYSFS_DEPRECATED
	416	err = sysfs_create_link(block_depr, &disk->dev.kobj,
	417	kobject_name(&disk->dev.kobj));
eee44cca	418	if (err) {
edfaa7c3	419	device_del(&disk->dev);
eee44cca JG	420	return;
eee44cca JG	421	}
edfaa7c3 KS	422	#endif
edfaa7c3 KS	423	disk_sysfs_add_subdirs(disk);
1da177e4 LT	424
1da177e4 LT	425	/* No minors to use for partitions */
a2964188	426	if (disk->minors == 1)
d4d7e5df	427	goto exit;
1da177e4 LT	428
	429	/* No such device (e.g., media were just removed) */
	430	if (!get_capacity(disk))
d4d7e5df	431	goto exit;
1da177e4 LT	432
	433	bdev = bdget_disk(disk, 0);
	434	if (!bdev)
d4d7e5df	435	goto exit;
1da177e4 LT	436
1da177e4 LT	437	bdev->bd_invalidated = 1;
d4d7e5df	438	err = blkdev_get(bdev, FMODE_READ, 0);
d4d7e5df KS	439	if (err < 0)
d4d7e5df KS	440	goto exit;
1da177e4	441	blkdev_put(bdev);
d4d7e5df KS	442
d4d7e5df KS	443	exit:
edfaa7c3 KS	444	/* announce disk after possible partitions are created */
	445	disk->dev.uevent_suppress = 0;
	446	kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
d4d7e5df KS	447
	448	/* announce possible partitions */
	449	for (i = 1; i < disk->minors; i++) {
	450	p = disk->part[i-1];
	451	if (!p \|\| !p->nr_sects)
	452	continue;
edfaa7c3	453	kobject_uevent(&p->dev.kobj, KOBJ_ADD);
d4d7e5df	454	}
1da177e4 LT	455	}
	456
	457	int rescan_partitions(struct gendisk disk, struct block_device bdev)
	458	{
	459	struct parsed_partitions *state;
	460	int p, res;
	461
	462	if (bdev->bd_part_count)
	463	return -EBUSY;
	464	res = invalidate_partition(disk, 0);
	465	if (res)
	466	return res;
	467	bdev->bd_invalidated = 0;
	468	for (p = 1; p < disk->minors; p++)
	469	delete_partition(disk, p);
	470	if (disk->fops->revalidate_disk)
	471	disk->fops->revalidate_disk(disk);
	472	if (!get_capacity(disk) \|\| !(state = check_partition(disk, bdev)))
	473	return 0;
5127d002	474	if (IS_ERR(state)) /* I/O error reading the partition table */
b74a2f09	475	return -EIO;
6bcf19d0 KS	476
	477	/* tell userspace that the media / partition table may have changed */
	478	kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
	479
1da177e4 LT	480	for (p = 1; p < state->limit; p++) {
	481	sector_t size = state->parts[p].size;
	482	sector_t from = state->parts[p].from;
	483	if (!size)
	484	continue;
98bd34ea MM	485	if (from + size > get_capacity(disk)) {
	486	printk(" %s: p%d exceeds device capacity\n",
	487	disk->disk_name, p);
	488	}
d18d7682	489	add_partition(disk, p, from, size, state->parts[p].flags);
1da177e4	490	#ifdef CONFIG_BLK_DEV_MD
d18d7682	491	if (state->parts[p].flags & ADDPART_FLAG_RAID)
1da177e4 LT	492	md_autodetect_dev(bdev->bd_dev+p);
	493	#endif
	494	}
	495	kfree(state);
	496	return 0;
	497	}
	498
	499	unsigned char read_dev_sector(struct block_device bdev, sector_t n, Sector *p)
	500	{
	501	struct address_space *mapping = bdev->bd_inode->i_mapping;
	502	struct page *page;
	503
090d2b18 PE	504	page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
090d2b18 PE	505	NULL);
1da177e4	506	if (!IS_ERR(page)) {
1da177e4 LT	507	if (PageError(page))
	508	goto fail;
	509	p->v = page;
	510	return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
	511	fail:
	512	page_cache_release(page);
	513	}
	514	p->v = NULL;
	515	return NULL;
	516	}
	517
	518	EXPORT_SYMBOL(read_dev_sector);
	519
	520	void del_gendisk(struct gendisk *disk)
	521	{
	522	int p;
	523
	524	/* invalidate stuff */
	525	for (p = disk->minors - 1; p > 0; p--) {
	526	invalidate_partition(disk, p);
	527	delete_partition(disk, p);
	528	}
	529	invalidate_partition(disk, 0);
	530	disk->capacity = 0;
	531	disk->flags &= ~GENHD_FL_UP;
	532	unlink_gendisk(disk);
	533	disk_stat_set_all(disk, 0);
20e5c81f	534	disk->stamp = 0;
1da177e4	535
197b12d6 GKH	536	kobject_put(disk->holder_dir);
197b12d6 GKH	537	kobject_put(disk->slave_dir);
edfaa7c3 KS	538	disk->driverfs_dev = NULL;
	539	#ifndef CONFIG_SYSFS_DEPRECATED
	540	sysfs_remove_link(block_depr, disk->dev.bus_id);
	541	#endif
	542	device_del(&disk->dev);
1da177e4	543	}