mirror of https://gitee.com/openkylin/linux.git
745 lines
18 KiB
C
745 lines
18 KiB
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/slab.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/genhd.h>
|
|
#include <linux/blktrace_api.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 *) = {
|
|
/*
|
|
* 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 partno, char *buf)
|
|
{
|
|
if (!partno)
|
|
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, partno);
|
|
else
|
|
snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
|
|
|
|
return buf;
|
|
}
|
|
|
|
const char *bdevname(struct block_device *bdev, char *buf)
|
|
{
|
|
return disk_name(bdev->bd_disk, bdev->bd_part->partno, 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 = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
|
|
if (!state)
|
|
return NULL;
|
|
state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!state->pp_buf) {
|
|
kfree(state);
|
|
return NULL;
|
|
}
|
|
state->pp_buf[0] = '\0';
|
|
|
|
state->bdev = bdev;
|
|
disk_name(hd, 0, state->name);
|
|
snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
|
|
if (isdigit(state->name[strlen(state->name)-1]))
|
|
sprintf(state->name, "p");
|
|
|
|
state->limit = disk_max_parts(hd);
|
|
i = res = err = 0;
|
|
while (!res && check_part[i]) {
|
|
memset(&state->parts, 0, sizeof(state->parts));
|
|
res = check_part[i++](state);
|
|
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) {
|
|
printk(KERN_INFO "%s", state->pp_buf);
|
|
|
|
free_page((unsigned long)state->pp_buf);
|
|
return state;
|
|
}
|
|
if (state->access_beyond_eod)
|
|
err = -ENOSPC;
|
|
if (err)
|
|
/* The partition is unrecognized. So report I/O errors if there were any */
|
|
res = err;
|
|
if (!res)
|
|
strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
|
|
else if (warn_no_part)
|
|
strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
|
|
|
|
printk(KERN_INFO "%s", state->pp_buf);
|
|
|
|
free_page((unsigned long)state->pp_buf);
|
|
kfree(state);
|
|
return ERR_PTR(res);
|
|
}
|
|
|
|
static ssize_t part_partition_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct hd_struct *p = dev_to_part(dev);
|
|
|
|
return sprintf(buf, "%d\n", p->partno);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
ssize_t part_alignment_offset_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->alignment_offset);
|
|
}
|
|
|
|
ssize_t part_discard_alignment_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct hd_struct *p = dev_to_part(dev);
|
|
return sprintf(buf, "%u\n", p->discard_alignment);
|
|
}
|
|
|
|
ssize_t part_stat_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct hd_struct *p = dev_to_part(dev);
|
|
int cpu;
|
|
|
|
cpu = part_stat_lock();
|
|
part_round_stats(cpu, p);
|
|
part_stat_unlock();
|
|
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])),
|
|
part_in_flight(p),
|
|
jiffies_to_msecs(part_stat_read(p, io_ticks)),
|
|
jiffies_to_msecs(part_stat_read(p, time_in_queue)));
|
|
}
|
|
|
|
ssize_t part_inflight_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct hd_struct *p = dev_to_part(dev);
|
|
|
|
return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
|
|
}
|
|
|
|
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
|
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);
|
|
}
|
|
|
|
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(partition, S_IRUGO, part_partition_show, NULL);
|
|
static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
|
|
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
|
|
static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
|
|
static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
|
|
NULL);
|
|
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
|
|
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_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_partition.attr,
|
|
&dev_attr_start.attr,
|
|
&dev_attr_size.attr,
|
|
&dev_attr_alignment_offset.attr,
|
|
&dev_attr_discard_alignment.attr,
|
|
&dev_attr_stat.attr,
|
|
&dev_attr_inflight.attr,
|
|
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
|
&dev_attr_fail.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group part_attr_group = {
|
|
.attrs = part_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *part_attr_groups[] = {
|
|
&part_attr_group,
|
|
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
|
&blk_trace_attr_group,
|
|
#endif
|
|
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 void delete_partition_rcu_cb(struct rcu_head *head)
|
|
{
|
|
struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
|
|
|
|
part->start_sect = 0;
|
|
part->nr_sects = 0;
|
|
part_stat_set_all(part, 0);
|
|
put_device(part_to_dev(part));
|
|
}
|
|
|
|
void delete_partition(struct gendisk *disk, int partno)
|
|
{
|
|
struct disk_part_tbl *ptbl = disk->part_tbl;
|
|
struct hd_struct *part;
|
|
|
|
if (partno >= ptbl->len)
|
|
return;
|
|
|
|
part = ptbl->part[partno];
|
|
if (!part)
|
|
return;
|
|
|
|
blk_free_devt(part_devt(part));
|
|
rcu_assign_pointer(ptbl->part[partno], NULL);
|
|
rcu_assign_pointer(ptbl->last_lookup, NULL);
|
|
kobject_put(part->holder_dir);
|
|
device_del(part_to_dev(part));
|
|
|
|
call_rcu(&part->rcu_head, delete_partition_rcu_cb);
|
|
}
|
|
|
|
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);
|
|
|
|
struct hd_struct *add_partition(struct gendisk *disk, int partno,
|
|
sector_t start, sector_t len, int flags)
|
|
{
|
|
struct hd_struct *p;
|
|
dev_t devt = MKDEV(0, 0);
|
|
struct device *ddev = disk_to_dev(disk);
|
|
struct device *pdev;
|
|
struct disk_part_tbl *ptbl;
|
|
const char *dname;
|
|
int err;
|
|
|
|
err = disk_expand_part_tbl(disk, partno);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
ptbl = disk->part_tbl;
|
|
|
|
if (ptbl->part[partno])
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (!p)
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
if (!init_part_stats(p)) {
|
|
err = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
pdev = part_to_dev(p);
|
|
|
|
p->start_sect = start;
|
|
p->alignment_offset =
|
|
queue_limit_alignment_offset(&disk->queue->limits, start);
|
|
p->discard_alignment =
|
|
queue_limit_discard_alignment(&disk->queue->limits, start);
|
|
p->nr_sects = len;
|
|
p->partno = partno;
|
|
p->policy = get_disk_ro(disk);
|
|
|
|
dname = dev_name(ddev);
|
|
if (isdigit(dname[strlen(dname) - 1]))
|
|
dev_set_name(pdev, "%sp%d", dname, partno);
|
|
else
|
|
dev_set_name(pdev, "%s%d", dname, partno);
|
|
|
|
device_initialize(pdev);
|
|
pdev->class = &block_class;
|
|
pdev->type = &part_type;
|
|
pdev->parent = ddev;
|
|
|
|
err = blk_alloc_devt(p, &devt);
|
|
if (err)
|
|
goto out_free_stats;
|
|
pdev->devt = devt;
|
|
|
|
/* delay uevent until 'holders' subdir is created */
|
|
dev_set_uevent_suppress(pdev, 1);
|
|
err = device_add(pdev);
|
|
if (err)
|
|
goto out_put;
|
|
|
|
err = -ENOMEM;
|
|
p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
|
|
if (!p->holder_dir)
|
|
goto out_del;
|
|
|
|
dev_set_uevent_suppress(pdev, 0);
|
|
if (flags & ADDPART_FLAG_WHOLEDISK) {
|
|
err = device_create_file(pdev, &dev_attr_whole_disk);
|
|
if (err)
|
|
goto out_del;
|
|
}
|
|
|
|
/* everything is up and running, commence */
|
|
rcu_assign_pointer(ptbl->part[partno], p);
|
|
|
|
/* suppress uevent if the disk supresses it */
|
|
if (!dev_get_uevent_suppress(ddev))
|
|
kobject_uevent(&pdev->kobj, KOBJ_ADD);
|
|
|
|
return p;
|
|
|
|
out_free_stats:
|
|
free_part_stats(p);
|
|
out_free:
|
|
kfree(p);
|
|
return ERR_PTR(err);
|
|
out_del:
|
|
kobject_put(p->holder_dir);
|
|
device_del(pdev);
|
|
out_put:
|
|
put_device(pdev);
|
|
blk_free_devt(devt);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/* Not exported, helper to add_disk(). */
|
|
void register_disk(struct gendisk *disk)
|
|
{
|
|
struct device *ddev = disk_to_dev(disk);
|
|
struct block_device *bdev;
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
int err;
|
|
|
|
ddev->parent = disk->driverfs_dev;
|
|
|
|
dev_set_name(ddev, disk->disk_name);
|
|
|
|
/* delay uevents, until we scanned partition table */
|
|
dev_set_uevent_suppress(ddev, 1);
|
|
|
|
if (device_add(ddev))
|
|
return;
|
|
#ifndef CONFIG_SYSFS_DEPRECATED
|
|
err = sysfs_create_link(block_depr, &ddev->kobj,
|
|
kobject_name(&ddev->kobj));
|
|
if (err) {
|
|
device_del(ddev);
|
|
return;
|
|
}
|
|
#endif
|
|
disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
|
|
disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
|
|
|
|
/* No minors to use for partitions */
|
|
if (!disk_partitionable(disk))
|
|
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);
|
|
if (err < 0)
|
|
goto exit;
|
|
blkdev_put(bdev, FMODE_READ);
|
|
|
|
exit:
|
|
/* announce disk after possible partitions are created */
|
|
dev_set_uevent_suppress(ddev, 0);
|
|
kobject_uevent(&ddev->kobj, KOBJ_ADD);
|
|
|
|
/* announce possible partitions */
|
|
disk_part_iter_init(&piter, disk, 0);
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
|
|
disk_part_iter_exit(&piter);
|
|
}
|
|
|
|
static bool disk_unlock_native_capacity(struct gendisk *disk)
|
|
{
|
|
const struct block_device_operations *bdops = disk->fops;
|
|
|
|
if (bdops->unlock_native_capacity &&
|
|
!(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
|
|
printk(KERN_CONT "enabling native capacity\n");
|
|
bdops->unlock_native_capacity(disk);
|
|
disk->flags |= GENHD_FL_NATIVE_CAPACITY;
|
|
return true;
|
|
} else {
|
|
printk(KERN_CONT "truncated\n");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
{
|
|
struct parsed_partitions *state = NULL;
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
int p, highest, res;
|
|
rescan:
|
|
if (state && !IS_ERR(state)) {
|
|
kfree(state);
|
|
state = NULL;
|
|
}
|
|
|
|
if (bdev->bd_part_count)
|
|
return -EBUSY;
|
|
res = invalidate_partition(disk, 0);
|
|
if (res)
|
|
return res;
|
|
|
|
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
delete_partition(disk, part->partno);
|
|
disk_part_iter_exit(&piter);
|
|
|
|
if (disk->fops->revalidate_disk)
|
|
disk->fops->revalidate_disk(disk);
|
|
check_disk_size_change(disk, bdev);
|
|
bdev->bd_invalidated = 0;
|
|
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
|
|
return 0;
|
|
if (IS_ERR(state)) {
|
|
/*
|
|
* I/O error reading the partition table. If any
|
|
* partition code tried to read beyond EOD, retry
|
|
* after unlocking native capacity.
|
|
*/
|
|
if (PTR_ERR(state) == -ENOSPC) {
|
|
printk(KERN_WARNING "%s: partition table beyond EOD, ",
|
|
disk->disk_name);
|
|
if (disk_unlock_native_capacity(disk))
|
|
goto rescan;
|
|
}
|
|
return -EIO;
|
|
}
|
|
/*
|
|
* If any partition code tried to read beyond EOD, try
|
|
* unlocking native capacity even if partition table is
|
|
* sucessfully read as we could be missing some partitions.
|
|
*/
|
|
if (state->access_beyond_eod) {
|
|
printk(KERN_WARNING
|
|
"%s: partition table partially beyond EOD, ",
|
|
disk->disk_name);
|
|
if (disk_unlock_native_capacity(disk))
|
|
goto rescan;
|
|
}
|
|
|
|
/* tell userspace that the media / partition table may have changed */
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
|
|
/* Detect the highest partition number and preallocate
|
|
* disk->part_tbl. This is an optimization and not strictly
|
|
* necessary.
|
|
*/
|
|
for (p = 1, highest = 0; p < state->limit; p++)
|
|
if (state->parts[p].size)
|
|
highest = p;
|
|
|
|
disk_expand_part_tbl(disk, highest);
|
|
|
|
/* add partitions */
|
|
for (p = 1; p < state->limit; p++) {
|
|
sector_t size, from;
|
|
|
|
size = state->parts[p].size;
|
|
if (!size)
|
|
continue;
|
|
|
|
from = state->parts[p].from;
|
|
if (from >= get_capacity(disk)) {
|
|
printk(KERN_WARNING
|
|
"%s: p%d start %llu is beyond EOD, ",
|
|
disk->disk_name, p, (unsigned long long) from);
|
|
if (disk_unlock_native_capacity(disk))
|
|
goto rescan;
|
|
continue;
|
|
}
|
|
|
|
if (from + size > get_capacity(disk)) {
|
|
printk(KERN_WARNING
|
|
"%s: p%d size %llu extends beyond EOD, ",
|
|
disk->disk_name, p, (unsigned long long) size);
|
|
|
|
if (disk_unlock_native_capacity(disk)) {
|
|
/* free state and restart */
|
|
goto rescan;
|
|
} else {
|
|
/*
|
|
* we can not ignore partitions of broken tables
|
|
* created by for example camera firmware, but
|
|
* we limit them to the end of the disk to avoid
|
|
* creating invalid block devices
|
|
*/
|
|
size = get_capacity(disk) - from;
|
|
}
|
|
}
|
|
part = add_partition(disk, p, from, size,
|
|
state->parts[p].flags);
|
|
if (IS_ERR(part)) {
|
|
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
|
disk->disk_name, p, -PTR_ERR(part));
|
|
continue;
|
|
}
|
|
#ifdef CONFIG_BLK_DEV_MD
|
|
if (state->parts[p].flags & ADDPART_FLAG_RAID)
|
|
md_autodetect_dev(part_to_dev(part)->devt);
|
|
#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)
|
|
{
|
|
struct disk_part_iter piter;
|
|
struct hd_struct *part;
|
|
|
|
/* invalidate stuff */
|
|
disk_part_iter_init(&piter, disk,
|
|
DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
|
|
while ((part = disk_part_iter_next(&piter))) {
|
|
invalidate_partition(disk, part->partno);
|
|
delete_partition(disk, part->partno);
|
|
}
|
|
disk_part_iter_exit(&piter);
|
|
|
|
invalidate_partition(disk, 0);
|
|
blk_free_devt(disk_to_dev(disk)->devt);
|
|
set_capacity(disk, 0);
|
|
disk->flags &= ~GENHD_FL_UP;
|
|
unlink_gendisk(disk);
|
|
part_stat_set_all(&disk->part0, 0);
|
|
disk->part0.stamp = 0;
|
|
|
|
kobject_put(disk->part0.holder_dir);
|
|
kobject_put(disk->slave_dir);
|
|
disk->driverfs_dev = NULL;
|
|
#ifndef CONFIG_SYSFS_DEPRECATED
|
|
sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
|
|
#endif
|
|
device_del(disk_to_dev(disk));
|
|
}
|