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515 lines
12 KiB
515 lines
12 KiB
/*
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* fs/partitions/check.c
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*
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* Code extracted from drivers/block/genhd.c
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*
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* We now have independent partition support from the
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* block drivers, which allows all the partition code to
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* be grouped in one location, and it to be mostly self
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* contained.
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*
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* Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kmod.h>
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#include <linux/ctype.h>
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#include "check.h"
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#include "acorn.h"
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#include "amiga.h"
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#include "atari.h"
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#include "ldm.h"
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#include "mac.h"
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#include "msdos.h"
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#include "osf.h"
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#include "sgi.h"
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#include "sun.h"
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#include "ibm.h"
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#include "ultrix.h"
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#include "efi.h"
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#include "karma.h"
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#include "sysv68.h"
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#ifdef CONFIG_BLK_DEV_MD
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extern void md_autodetect_dev(dev_t dev);
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#endif
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int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
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static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
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/*
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* Probe partition formats with tables at disk address 0
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* that also have an ADFS boot block at 0xdc0.
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*/
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#ifdef CONFIG_ACORN_PARTITION_ICS
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adfspart_check_ICS,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_POWERTEC
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adfspart_check_POWERTEC,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_EESOX
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adfspart_check_EESOX,
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#endif
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/*
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* Now move on to formats that only have partition info at
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* disk address 0xdc0. Since these may also have stale
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* PC/BIOS partition tables, they need to come before
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* the msdos entry.
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*/
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#ifdef CONFIG_ACORN_PARTITION_CUMANA
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adfspart_check_CUMANA,
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#endif
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#ifdef CONFIG_ACORN_PARTITION_ADFS
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adfspart_check_ADFS,
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#endif
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#ifdef CONFIG_EFI_PARTITION
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efi_partition, /* this must come before msdos */
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#endif
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#ifdef CONFIG_SGI_PARTITION
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sgi_partition,
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#endif
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#ifdef CONFIG_LDM_PARTITION
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ldm_partition, /* this must come before msdos */
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#endif
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#ifdef CONFIG_MSDOS_PARTITION
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msdos_partition,
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#endif
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#ifdef CONFIG_OSF_PARTITION
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osf_partition,
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#endif
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#ifdef CONFIG_SUN_PARTITION
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sun_partition,
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#endif
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#ifdef CONFIG_AMIGA_PARTITION
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amiga_partition,
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#endif
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#ifdef CONFIG_ATARI_PARTITION
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atari_partition,
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#endif
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#ifdef CONFIG_MAC_PARTITION
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mac_partition,
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#endif
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#ifdef CONFIG_ULTRIX_PARTITION
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ultrix_partition,
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#endif
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#ifdef CONFIG_IBM_PARTITION
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ibm_partition,
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#endif
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#ifdef CONFIG_KARMA_PARTITION
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karma_partition,
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#endif
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#ifdef CONFIG_SYSV68_PARTITION
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sysv68_partition,
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#endif
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NULL
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};
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/*
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* disk_name() is used by partition check code and the genhd driver.
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* It formats the devicename of the indicated disk into
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* the supplied buffer (of size at least 32), and returns
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* a pointer to that same buffer (for convenience).
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*/
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char *disk_name(struct gendisk *hd, int part, char *buf)
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{
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if (!part)
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snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
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else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
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snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
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else
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snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
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return buf;
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}
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const char *bdevname(struct block_device *bdev, char *buf)
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{
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int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
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return disk_name(bdev->bd_disk, part, buf);
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}
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EXPORT_SYMBOL(bdevname);
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/*
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* There's very little reason to use this, you should really
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* have a struct block_device just about everywhere and use
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* bdevname() instead.
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*/
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const char *__bdevname(dev_t dev, char *buffer)
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{
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scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
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MAJOR(dev), MINOR(dev));
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return buffer;
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}
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EXPORT_SYMBOL(__bdevname);
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static struct parsed_partitions *
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check_partition(struct gendisk *hd, struct block_device *bdev)
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{
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struct parsed_partitions *state;
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int i, res, err;
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state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
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if (!state)
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return NULL;
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disk_name(hd, 0, state->name);
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printk(KERN_INFO " %s:", state->name);
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if (isdigit(state->name[strlen(state->name)-1]))
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sprintf(state->name, "p");
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state->limit = hd->minors;
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i = res = err = 0;
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while (!res && check_part[i]) {
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memset(&state->parts, 0, sizeof(state->parts));
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res = check_part[i++](state, bdev);
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if (res < 0) {
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/* We have hit an I/O error which we don't report now.
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* But record it, and let the others do their job.
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*/
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err = res;
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res = 0;
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}
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}
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if (res > 0)
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return state;
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if (err)
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/* The partition is unrecognized. So report I/O errors if there were any */
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res = err;
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if (!res)
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printk(" unknown partition table\n");
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else if (warn_no_part)
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printk(" unable to read partition table\n");
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kfree(state);
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return ERR_PTR(res);
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}
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static ssize_t part_start_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
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}
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static ssize_t part_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
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}
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static ssize_t part_stat_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%8u %8llu %8u %8llu\n",
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p->ios[0], (unsigned long long)p->sectors[0],
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p->ios[1], (unsigned long long)p->sectors[1]);
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}
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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static ssize_t part_fail_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->make_it_fail);
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}
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static ssize_t part_fail_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct hd_struct *p = dev_to_part(dev);
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int i;
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if (count > 0 && sscanf(buf, "%d", &i) > 0)
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p->make_it_fail = (i == 0) ? 0 : 1;
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return count;
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}
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#endif
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static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
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static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
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static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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static struct device_attribute dev_attr_fail =
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__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
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#endif
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static struct attribute *part_attrs[] = {
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&dev_attr_start.attr,
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&dev_attr_size.attr,
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&dev_attr_stat.attr,
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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&dev_attr_fail.attr,
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#endif
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NULL
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};
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static struct attribute_group part_attr_group = {
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.attrs = part_attrs,
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};
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static struct attribute_group *part_attr_groups[] = {
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&part_attr_group,
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NULL
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};
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static void part_release(struct device *dev)
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{
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struct hd_struct *p = dev_to_part(dev);
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kfree(p);
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}
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struct device_type part_type = {
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.name = "partition",
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.groups = part_attr_groups,
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.release = part_release,
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};
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static inline void partition_sysfs_add_subdir(struct hd_struct *p)
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{
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struct kobject *k;
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k = kobject_get(&p->dev.kobj);
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p->holder_dir = kobject_create_and_add("holders", k);
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kobject_put(k);
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}
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static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
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{
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struct kobject *k;
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k = kobject_get(&disk->dev.kobj);
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disk->holder_dir = kobject_create_and_add("holders", k);
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disk->slave_dir = kobject_create_and_add("slaves", k);
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kobject_put(k);
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}
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void delete_partition(struct gendisk *disk, int part)
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{
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struct hd_struct *p = disk->part[part-1];
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if (!p)
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return;
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if (!p->nr_sects)
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return;
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disk->part[part-1] = NULL;
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p->start_sect = 0;
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p->nr_sects = 0;
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p->ios[0] = p->ios[1] = 0;
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p->sectors[0] = p->sectors[1] = 0;
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kobject_put(p->holder_dir);
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device_del(&p->dev);
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put_device(&p->dev);
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}
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void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
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{
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struct hd_struct *p;
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int err;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return;
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p->start_sect = start;
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p->nr_sects = len;
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p->partno = part;
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p->policy = disk->policy;
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if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
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snprintf(p->dev.bus_id, BUS_ID_SIZE,
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"%sp%d", disk->dev.bus_id, part);
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else
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snprintf(p->dev.bus_id, BUS_ID_SIZE,
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"%s%d", disk->dev.bus_id, part);
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device_initialize(&p->dev);
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p->dev.devt = MKDEV(disk->major, disk->first_minor + part);
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p->dev.class = &block_class;
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p->dev.type = &part_type;
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p->dev.parent = &disk->dev;
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disk->part[part-1] = p;
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/* delay uevent until 'holders' subdir is created */
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p->dev.uevent_suppress = 1;
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device_add(&p->dev);
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partition_sysfs_add_subdir(p);
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p->dev.uevent_suppress = 0;
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if (flags & ADDPART_FLAG_WHOLEDISK) {
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static struct attribute addpartattr = {
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.name = "whole_disk",
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.mode = S_IRUSR | S_IRGRP | S_IROTH,
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};
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err = sysfs_create_file(&p->dev.kobj, &addpartattr);
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}
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/* suppress uevent if the disk supresses it */
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if (!disk->dev.uevent_suppress)
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kobject_uevent(&p->dev.kobj, KOBJ_ADD);
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}
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/* Not exported, helper to add_disk(). */
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void register_disk(struct gendisk *disk)
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{
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struct block_device *bdev;
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char *s;
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int i;
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struct hd_struct *p;
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int err;
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disk->dev.parent = disk->driverfs_dev;
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disk->dev.devt = MKDEV(disk->major, disk->first_minor);
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strlcpy(disk->dev.bus_id, disk->disk_name, KOBJ_NAME_LEN);
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/* ewww... some of these buggers have / in the name... */
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s = strchr(disk->dev.bus_id, '/');
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if (s)
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*s = '!';
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/* delay uevents, until we scanned partition table */
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disk->dev.uevent_suppress = 1;
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if (device_add(&disk->dev))
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return;
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#ifndef CONFIG_SYSFS_DEPRECATED
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err = sysfs_create_link(block_depr, &disk->dev.kobj,
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kobject_name(&disk->dev.kobj));
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if (err) {
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device_del(&disk->dev);
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return;
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}
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#endif
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disk_sysfs_add_subdirs(disk);
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/* No minors to use for partitions */
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if (disk->minors == 1)
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goto exit;
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/* No such device (e.g., media were just removed) */
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if (!get_capacity(disk))
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goto exit;
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bdev = bdget_disk(disk, 0);
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if (!bdev)
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goto exit;
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bdev->bd_invalidated = 1;
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err = blkdev_get(bdev, FMODE_READ, 0);
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if (err < 0)
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goto exit;
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blkdev_put(bdev);
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exit:
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/* announce disk after possible partitions are created */
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disk->dev.uevent_suppress = 0;
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kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
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/* announce possible partitions */
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for (i = 1; i < disk->minors; i++) {
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p = disk->part[i-1];
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if (!p || !p->nr_sects)
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continue;
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kobject_uevent(&p->dev.kobj, KOBJ_ADD);
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}
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}
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int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
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{
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struct parsed_partitions *state;
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int p, res;
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if (bdev->bd_part_count)
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return -EBUSY;
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res = invalidate_partition(disk, 0);
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if (res)
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return res;
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bdev->bd_invalidated = 0;
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for (p = 1; p < disk->minors; p++)
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delete_partition(disk, p);
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if (disk->fops->revalidate_disk)
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disk->fops->revalidate_disk(disk);
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if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
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return 0;
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if (IS_ERR(state)) /* I/O error reading the partition table */
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return -EIO;
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for (p = 1; p < state->limit; p++) {
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sector_t size = state->parts[p].size;
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sector_t from = state->parts[p].from;
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if (!size)
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continue;
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if (from + size > get_capacity(disk)) {
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printk(" %s: p%d exceeds device capacity\n",
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disk->disk_name, p);
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}
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add_partition(disk, p, from, size, state->parts[p].flags);
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#ifdef CONFIG_BLK_DEV_MD
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if (state->parts[p].flags & ADDPART_FLAG_RAID)
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md_autodetect_dev(bdev->bd_dev+p);
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#endif
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}
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kfree(state);
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return 0;
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}
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unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
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{
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struct address_space *mapping = bdev->bd_inode->i_mapping;
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struct page *page;
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page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
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NULL);
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if (!IS_ERR(page)) {
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if (PageError(page))
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goto fail;
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p->v = page;
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return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
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fail:
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page_cache_release(page);
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}
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p->v = NULL;
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return NULL;
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}
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EXPORT_SYMBOL(read_dev_sector);
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void del_gendisk(struct gendisk *disk)
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{
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int p;
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/* invalidate stuff */
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for (p = disk->minors - 1; p > 0; p--) {
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invalidate_partition(disk, p);
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delete_partition(disk, p);
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}
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invalidate_partition(disk, 0);
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disk->capacity = 0;
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disk->flags &= ~GENHD_FL_UP;
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unlink_gendisk(disk);
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disk_stat_set_all(disk, 0);
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disk->stamp = 0;
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kobject_put(disk->holder_dir);
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kobject_put(disk->slave_dir);
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disk->driverfs_dev = NULL;
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#ifndef CONFIG_SYSFS_DEPRECATED
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sysfs_remove_link(block_depr, disk->dev.bus_id);
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#endif
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device_del(&disk->dev);
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}
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|