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Diffstat (limited to 'i386/i386at/gpl/linux/block/genhd.c')
-rw-r--r--i386/i386at/gpl/linux/block/genhd.c610
1 files changed, 0 insertions, 610 deletions
diff --git a/i386/i386at/gpl/linux/block/genhd.c b/i386/i386at/gpl/linux/block/genhd.c
deleted file mode 100644
index cebc7ea..0000000
--- a/i386/i386at/gpl/linux/block/genhd.c
+++ /dev/null
@@ -1,610 +0,0 @@
-/*
- * Code extracted from
- * linux/kernel/hd.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- *
- * Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
- * in the early extended-partition checks and added DM partitions
- *
- * Support for DiskManager v6.0x added by Mark Lord (mlord@bnr.ca)
- * with information provided by OnTrack. This now works for linux fdisk
- * and LILO, as well as loadlin and bootln. Note that disks other than
- * /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1).
- *
- * More flexible handling of extended partitions - aeb, 950831
- *
- * Check partition table on IDE disks for common CHS translations
- */
-
-#include <linux/config.h>
-#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/kernel.h>
-#include <linux/major.h>
-#include <linux/string.h>
-
-#include <asm/system.h>
-
-#ifdef __alpha__
-/*
- * On the Alpha, we get unaligned access exceptions on
- * p->nr_sects and p->start_sect, when the partition table
- * is not on a 4-byte boundary, which is frequently the case.
- * This code uses unaligned load instructions to prevent
- * such exceptions.
- */
-#include <asm/unaligned.h>
-#define NR_SECTS(p) ldl_u(&p->nr_sects)
-#define START_SECT(p) ldl_u(&p->start_sect)
-#else /* __alpha__ */
-#define NR_SECTS(p) p->nr_sects
-#define START_SECT(p) p->start_sect
-#endif /* __alpha__ */
-
-#ifdef MACH
-#include <i386/ipl.h>
-#endif
-
-struct gendisk *gendisk_head = NULL;
-
-static int current_minor = 0;
-extern int *blk_size[];
-extern void rd_load(void);
-
-extern int chr_dev_init(void);
-extern int blk_dev_init(void);
-extern int scsi_dev_init(void);
-extern int net_dev_init(void);
-
-static void print_minor_name (struct gendisk *hd, int minor)
-{
- unsigned int unit = minor >> hd->minor_shift;
- unsigned int part = minor & ((1 << hd->minor_shift) - 1);
-
-#ifdef CONFIG_BLK_DEV_IDE
- /*
- * IDE devices use multiple major numbers, but the drives
- * are named as: {hda,hdb}, {hdc,hdd}, {hde,hdf}, {hdg,hdh}..
- * This requires some creative handling here to find the
- * correct name to use, with some help from ide.c
- */
- if (!strcmp(hd->major_name,"ide")) {
- char name[16]; /* more than large enough */
- strcpy(name, hd->real_devices); /* courtesy ide.c */
- name[strlen(name)-1] += unit;
- printk(" %s", name);
- } else
-#endif
- printk(" %s%c", hd->major_name, 'a' + unit);
- if (part)
- printk("%d", part);
- else
- printk(":");
-}
-
-static void add_partition (struct gendisk *hd, int minor, int start, int size)
-{
- hd->part[minor].start_sect = start;
- hd->part[minor].nr_sects = size;
- /* print_minor_name(hd, minor);*/
-}
-
-static inline int is_extended_partition(struct partition *p)
-{
- return (p->sys_ind == DOS_EXTENDED_PARTITION ||
- p->sys_ind == LINUX_EXTENDED_PARTITION);
-}
-
-#ifdef CONFIG_MSDOS_PARTITION
-/*
- * Create devices for each logical partition in an extended partition.
- * The logical partitions form a linked list, with each entry being
- * a partition table with two entries. The first entry
- * is the real data partition (with a start relative to the partition
- * table start). The second is a pointer to the next logical partition
- * (with a start relative to the entire extended partition).
- * We do not create a Linux partition for the partition tables, but
- * only for the actual data partitions.
- */
-
-static void extended_partition(struct gendisk *hd, kdev_t dev)
-{
- struct buffer_head *bh;
- struct partition *p;
- unsigned long first_sector, first_size, this_sector, this_size;
- int mask = (1 << hd->minor_shift) - 1;
- int i;
-
- first_sector = hd->part[MINOR(dev)].start_sect;
- first_size = hd->part[MINOR(dev)].nr_sects;
- this_sector = first_sector;
-
- while (1) {
- if ((current_minor & mask) == 0)
- return;
- if (!(bh = bread(dev,0,1024)))
- return;
- /*
- * This block is from a device that we're about to stomp on.
- * So make sure nobody thinks this block is usable.
- */
- bh->b_state = 0;
-
- if (*(unsigned short *) (bh->b_data+510) != 0xAA55)
- goto done;
-
- p = (struct partition *) (0x1BE + bh->b_data);
-
- this_size = hd->part[MINOR(dev)].nr_sects;
-
- /*
- * Usually, the first entry is the real data partition,
- * the 2nd entry is the next extended partition, or empty,
- * and the 3rd and 4th entries are unused.
- * However, DRDOS sometimes has the extended partition as
- * the first entry (when the data partition is empty),
- * and OS/2 seems to use all four entries.
- */
-
- /*
- * First process the data partition(s)
- */
- for (i=0; i<4; i++, p++) {
- if (!NR_SECTS(p) || is_extended_partition(p))
- continue;
-
- /* Check the 3rd and 4th entries -
- these sometimes contain random garbage */
- if (i >= 2
- && START_SECT(p) + NR_SECTS(p) > this_size
- && (this_sector + START_SECT(p) < first_sector ||
- this_sector + START_SECT(p) + NR_SECTS(p) >
- first_sector + first_size))
- continue;
-
- add_partition(hd, current_minor, this_sector+START_SECT(p), NR_SECTS(p));
- current_minor++;
- if ((current_minor & mask) == 0)
- goto done;
- }
- /*
- * Next, process the (first) extended partition, if present.
- * (So far, there seems to be no reason to make
- * extended_partition() recursive and allow a tree
- * of extended partitions.)
- * It should be a link to the next logical partition.
- * Create a minor for this just long enough to get the next
- * partition table. The minor will be reused for the next
- * data partition.
- */
- p -= 4;
- for (i=0; i<4; i++, p++)
- if(NR_SECTS(p) && is_extended_partition(p))
- break;
- if (i == 4)
- goto done; /* nothing left to do */
-
- hd->part[current_minor].nr_sects = NR_SECTS(p);
- hd->part[current_minor].start_sect = first_sector + START_SECT(p);
- this_sector = first_sector + START_SECT(p);
- dev = MKDEV(hd->major, current_minor);
- brelse(bh);
- }
-done:
- brelse(bh);
-}
-
-static int msdos_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector)
-{
- int i, minor = current_minor;
- struct buffer_head *bh;
- struct partition *p;
- unsigned char *data;
- int mask = (1 << hd->minor_shift) - 1;
-#ifdef CONFIG_BLK_DEV_IDE
- int tested_for_xlate = 0;
-
-read_mbr:
-#endif
- if (!(bh = bread(dev,0,1024))) {
- printk(" unable to read partition table\n");
- return -1;
- }
- data = bh->b_data;
- /* In some cases we modify the geometry */
- /* of the drive (below), so ensure that */
- /* nobody else tries to re-use this data. */
- bh->b_state = 0;
-#ifdef CONFIG_BLK_DEV_IDE
-check_table:
-#endif
- if (*(unsigned short *) (0x1fe + data) != 0xAA55) {
- brelse(bh);
- return 0;
- }
- p = (struct partition *) (0x1be + data);
-
-#ifdef CONFIG_BLK_DEV_IDE
- if (!tested_for_xlate++) { /* Do this only once per disk */
- /*
- * Look for various forms of IDE disk geometry translation
- */
- extern int ide_xlate_1024(kdev_t, int, const char *);
- unsigned int sig = *(unsigned short *)(data + 2);
- if (p->sys_ind == EZD_PARTITION) {
- /*
- * The remainder of the disk must be accessed using
- * a translated geometry that reduces the number of
- * apparent cylinders to less than 1024 if possible.
- *
- * ide_xlate_1024() will take care of the necessary
- * adjustments to fool fdisk/LILO and partition check.
- */
- if (ide_xlate_1024(dev, -1, " [EZD]")) {
- data += 512;
- goto check_table;
- }
- } else if (p->sys_ind == DM6_PARTITION) {
-
- /*
- * Everything on the disk is offset by 63 sectors,
- * including a "new" MBR with its own partition table,
- * and the remainder of the disk must be accessed using
- * a translated geometry that reduces the number of
- * apparent cylinders to less than 1024 if possible.
- *
- * ide_xlate_1024() will take care of the necessary
- * adjustments to fool fdisk/LILO and partition check.
- */
- if (ide_xlate_1024(dev, 1, " [DM6:DDO]")) {
- brelse(bh);
- goto read_mbr; /* start over with new MBR */
- }
- } else if (sig <= 0x1ae && *(unsigned short *)(data + sig) == 0x55AA
- && (1 & *(unsigned char *)(data + sig + 2)) )
- {
- /*
- * DM6 signature in MBR, courtesy of OnTrack
- */
- (void) ide_xlate_1024 (dev, 0, " [DM6:MBR]");
- } else if (p->sys_ind == DM6_AUX1PARTITION || p->sys_ind == DM6_AUX3PARTITION) {
- /*
- * DM6 on other than the first (boot) drive
- */
- (void) ide_xlate_1024(dev, 0, " [DM6:AUX]");
- } else {
- /*
- * Examine the partition table for common translations.
- * This is necessary for drives for situations where
- * the translated geometry is unavailable from the BIOS.
- */
- for (i = 0; i < 4 ; i++) {
- struct partition *q = &p[i];
- if (NR_SECTS(q) && q->sector == 1 && q->end_sector == 63) {
- unsigned int heads = q->end_head + 1;
- if (heads == 32 || heads == 64 || heads == 128) {
-
- (void) ide_xlate_1024(dev, heads, " [PTBL]");
- break;
- }
- }
- }
- }
- }
-#endif /* CONFIG_BLK_DEV_IDE */
-
- current_minor += 4; /* first "extra" minor (for extended partitions) */
- for (i=1 ; i<=4 ; minor++,i++,p++) {
- if (!NR_SECTS(p))
- continue;
- add_partition(hd, minor, first_sector+START_SECT(p), NR_SECTS(p));
- if (is_extended_partition(p)) {
- /* printk(" <");*/
- /*
- * If we are rereading the partition table, we need
- * to set the size of the partition so that we will
- * be able to bread the block containing the extended
- * partition info.
- */
- hd->sizes[minor] = hd->part[minor].nr_sects
- >> (BLOCK_SIZE_BITS - 9);
- extended_partition(hd, MKDEV(hd->major, minor));
- /* printk(" >");*/
- /* prevent someone doing mkfs or mkswap on an
- extended partition, but leave room for LILO */
- if (hd->part[minor].nr_sects > 2)
- hd->part[minor].nr_sects = 2;
- }
- }
- /*
- * Check for old-style Disk Manager partition table
- */
- if (*(unsigned short *) (data+0xfc) == 0x55AA) {
- p = (struct partition *) (0x1be + data);
- for (i = 4 ; i < 16 ; i++, current_minor++) {
- p--;
- if ((current_minor & mask) == 0)
- break;
- if (!(START_SECT(p) && NR_SECTS(p)))
- continue;
- add_partition(hd, current_minor, START_SECT(p), NR_SECTS(p));
- }
- }
- /* printk("\n");*/
- brelse(bh);
- return 1;
-}
-
-#endif /* CONFIG_MSDOS_PARTITION */
-
-#ifdef CONFIG_OSF_PARTITION
-
-static int osf_partition(struct gendisk *hd, unsigned int dev, unsigned long first_sector)
-{
- int i;
- int mask = (1 << hd->minor_shift) - 1;
- struct buffer_head *bh;
- struct disklabel {
- u32 d_magic;
- u16 d_type,d_subtype;
- u8 d_typename[16];
- u8 d_packname[16];
- u32 d_secsize;
- u32 d_nsectors;
- u32 d_ntracks;
- u32 d_ncylinders;
- u32 d_secpercyl;
- u32 d_secprtunit;
- u16 d_sparespertrack;
- u16 d_sparespercyl;
- u32 d_acylinders;
- u16 d_rpm, d_interleave, d_trackskew, d_cylskew;
- u32 d_headswitch, d_trkseek, d_flags;
- u32 d_drivedata[5];
- u32 d_spare[5];
- u32 d_magic2;
- u16 d_checksum;
- u16 d_npartitions;
- u32 d_bbsize, d_sbsize;
- struct d_partition {
- u32 p_size;
- u32 p_offset;
- u32 p_fsize;
- u8 p_fstype;
- u8 p_frag;
- u16 p_cpg;
- } d_partitions[8];
- } * label;
- struct d_partition * partition;
-#define DISKLABELMAGIC (0x82564557UL)
-
- if (!(bh = bread(dev,0,1024))) {
- printk("unable to read partition table\n");
- return -1;
- }
- label = (struct disklabel *) (bh->b_data+64);
- partition = label->d_partitions;
- if (label->d_magic != DISKLABELMAGIC) {
- printk("magic: %08x\n", label->d_magic);
- brelse(bh);
- return 0;
- }
- if (label->d_magic2 != DISKLABELMAGIC) {
- printk("magic2: %08x\n", label->d_magic2);
- brelse(bh);
- return 0;
- }
- for (i = 0 ; i < label->d_npartitions; i++, partition++) {
- if ((current_minor & mask) == 0)
- break;
- if (partition->p_size)
- add_partition(hd, current_minor,
- first_sector+partition->p_offset,
- partition->p_size);
- current_minor++;
- }
- /* printk("\n");*/
- brelse(bh);
- return 1;
-}
-
-#endif /* CONFIG_OSF_PARTITION */
-
-#ifdef CONFIG_SUN_PARTITION
-
-static int sun_partition(struct gendisk *hd, unsigned int dev, unsigned long first_sector)
-{
- int i, csum;
- unsigned short *ush;
- struct buffer_head *bh;
- struct sun_disklabel {
- unsigned char info[128]; /* Informative text string */
- unsigned char spare[292]; /* Boot information etc. */
- unsigned short rspeed; /* Disk rotational speed */
- unsigned short pcylcount; /* Physical cylinder count */
- unsigned short sparecyl; /* extra sects per cylinder */
- unsigned char spare2[4]; /* More magic... */
- unsigned short ilfact; /* Interleave factor */
- unsigned short ncyl; /* Data cylinder count */
- unsigned short nacyl; /* Alt. cylinder count */
- unsigned short ntrks; /* Tracks per cylinder */
- unsigned short nsect; /* Sectors per track */
- unsigned char spare3[4]; /* Even more magic... */
- struct sun_partition {
- unsigned long start_cylinder;
- unsigned long num_sectors;
- } partitions[8];
- unsigned short magic; /* Magic number */
- unsigned short csum; /* Label xor'd checksum */
- } * label;
- struct sun_partition *p;
- unsigned long spc;
-#define SUN_LABEL_MAGIC 0xDABE
-
- if(!(bh = bread(dev, 0, 1024))) {
- printk("Dev %d: unable to read partition table\n", dev);
- return -1;
- }
- label = (struct sun_disklabel *) bh->b_data;
- p = label->partitions;
- if(label->magic != SUN_LABEL_MAGIC) {
- printk("Dev %d Sun disklabel: bad magic %08x\n", dev, label->magic);
- brelse(bh);
- return 0;
- }
- /* Look at the checksum */
- ush = ((unsigned short *) (label+1)) - 1;
- for(csum = 0; ush >= ((unsigned short *) label);)
- csum ^= *ush--;
- if(csum) {
- printk("Dev %d Sun disklabel: Csum bad, label corrupted\n", dev);
- brelse(bh);
- return 0;
- }
- /* All Sun disks have 8 partition entries */
- spc = (label->ntrks * label->nsect);
- for(i=0; i < 8; i++, p++) {
- unsigned long st_sector;
-
- /* We register all partitions, even if zero size, so that
- * the minor numbers end up ok as per SunOS interpretation.
- */
- st_sector = first_sector + (p->start_cylinder * spc);
- add_partition(hd, current_minor, st_sector, p->num_sectors);
- current_minor++;
- }
- /* printk("\n");*/
- brelse(bh);
- return 1;
-}
-
-#endif /* CONFIG_SUN_PARTITION */
-
-static void check_partition(struct gendisk *hd, kdev_t dev)
-{
- static int first_time = 1;
- unsigned long first_sector;
-
- /* if (first_time)
- printk("Partition check:\n");*/
- first_time = 0;
- first_sector = hd->part[MINOR(dev)].start_sect;
-
- /*
- * This is a kludge to allow the partition check to be
- * skipped for specific drives (e.g. IDE cd-rom drives)
- */
- if ((int)first_sector == -1) {
- hd->part[MINOR(dev)].start_sect = 0;
- return;
- }
-
- /* printk(" ");
- print_minor_name(hd, MINOR(dev));*/
-#ifdef CONFIG_MSDOS_PARTITION
- if (msdos_partition(hd, dev, first_sector))
- return;
-#endif
-#ifdef CONFIG_OSF_PARTITION
- if (osf_partition(hd, dev, first_sector))
- return;
-#endif
-#ifdef CONFIG_SUN_PARTITION
- if(sun_partition(hd, dev, first_sector))
- return;
-#endif
- printk(" unknown partition table\n");
-}
-
-/* This function is used to re-read partition tables for removable disks.
- Much of the cleanup from the old partition tables should have already been
- done */
-
-/* This function will re-read the partition tables for a given device,
-and set things back up again. There are some important caveats,
-however. You must ensure that no one is using the device, and no one
-can start using the device while this function is being executed. */
-
-void resetup_one_dev(struct gendisk *dev, int drive)
-{
- int i;
- int first_minor = drive << dev->minor_shift;
- int end_minor = first_minor + dev->max_p;
-
- blk_size[dev->major] = NULL;
- current_minor = 1 + first_minor;
- check_partition(dev, MKDEV(dev->major, first_minor));
-
- /*
- * We need to set the sizes array before we will be able to access
- * any of the partitions on this device.
- */
- if (dev->sizes != NULL) { /* optional safeguard in ll_rw_blk.c */
- for (i = first_minor; i < end_minor; i++)
- dev->sizes[i] = dev->part[i].nr_sects >> (BLOCK_SIZE_BITS - 9);
- blk_size[dev->major] = dev->sizes;
- }
-}
-
-static void setup_dev(struct gendisk *dev)
-{
- int i, drive;
- int end_minor = dev->max_nr * dev->max_p;
-
- blk_size[dev->major] = NULL;
- for (i = 0 ; i < end_minor; i++) {
- dev->part[i].start_sect = 0;
- dev->part[i].nr_sects = 0;
- }
- dev->init(dev);
- for (drive = 0 ; drive < dev->nr_real ; drive++) {
- int first_minor = drive << dev->minor_shift;
- current_minor = 1 + first_minor;
- check_partition(dev, MKDEV(dev->major, first_minor));
- }
- if (dev->sizes != NULL) { /* optional safeguard in ll_rw_blk.c */
- for (i = 0; i < end_minor; i++)
- dev->sizes[i] = dev->part[i].nr_sects >> (BLOCK_SIZE_BITS - 9);
- blk_size[dev->major] = dev->sizes;
- }
-}
-
-void device_setup(void)
-{
- extern void console_map_init(void);
- struct gendisk *p;
- int nr=0;
-#ifdef MACH
- extern int linux_intr_pri;
-
- linux_intr_pri = SPL5;
-#endif
-
-#ifndef MACH
- chr_dev_init();
-#endif
- blk_dev_init();
- sti();
-#ifdef CONFIG_SCSI
- scsi_dev_init();
-#endif
-#ifdef CONFIG_INET
-#ifdef MACH
- linux_intr_pri = SPL6;
-#endif
- net_dev_init();
-#endif
-#ifndef MACH
- console_map_init();
-#endif
-
- for (p = gendisk_head ; p ; p=p->next) {
- setup_dev(p);
- nr += p->nr_real;
- }
-#ifdef CONFIG_BLK_DEV_RAM
- rd_load();
-#endif
-}
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