patch-2.3.14 linux/fs/partitions/acorn.c

• Lines: 455
• Date: Thu Aug 12 12:26:06 1999
• Orig file: v2.3.13/linux/fs/partitions/acorn.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.13/linux/fs/partitions/acorn.c linux/fs/partitions/acorn.c
@@ -0,0 +1,454 @@
+/*
+ * linux/arch/arm/drivers/block/adfspart.c
+ *
+ * Copyright (c) 1996,1997 Russell King.
+ *
+ * Scan ADFS partitions on hard disk drives.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/kdev_t.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/genhd.h>
+#include <linux/fs.h>
+
+#include "acorn.h"
+
+extern void add_gd_partition(struct gendisk *hd, unsigned int minor, unsigned int start, unsigned int size);
+
+static void
+adfspart_setgeometry(kdev_t dev, unsigned int secspertrack, unsigned int heads,
+		     unsigned long totalblocks)
+{
+	extern void xd_set_geometry(kdev_t dev, unsigned char, unsigned char,
+				    unsigned long, unsigned int);
+
+#ifdef CONFIG_BLK_DEV_MFM
+	if (MAJOR(dev) == MFM_ACORN_MAJOR)
+		xd_set_geometry(dev, secspertrack, heads, totalblocks, 1);
+#endif
+}
+
+#define LINUX_NATIVE_MAGIC 0xdeafa1de
+#define LINUX_SWAP_MAGIC   0xdeafab1e
+
+struct linux_part {
+	unsigned long magic;
+	unsigned long start_sect;
+	unsigned long nr_sects;
+};
+
+static struct disc_record *adfs_partition(struct gendisk *hd, char *name, char *data,
+					   unsigned long first_sector, unsigned int minor)
+{
+	struct disc_record *dr;
+	unsigned int nr_sects;
+
+	if (adfs_checkbblk(data))
+		return NULL;
+
+	dr = (struct disc_record *)(data + 0x1c0);
+
+	if (dr->disc_size == 0 && dr->disc_size_high == 0)
+		return NULL;
+
+	nr_sects = (dr->disc_size_high << 23) | (dr->disc_size >> 9);
+
+	if (name)
+		printk(" [%s]", name);
+	add_gd_partition(hd, minor, first_sector, nr_sects);
+	return dr;
+}
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+static int riscix_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sect,
+			     unsigned int minor, unsigned long nr_sects)
+{
+	struct buffer_head *bh;
+	struct riscix_record *rr;
+	unsigned int riscix_minor;
+
+	printk(" [RISCiX]");
+
+	add_gd_partition(hd, riscix_minor = minor++, first_sect, nr_sects);
+	hd->sizes[riscix_minor] = hd->part[riscix_minor].nr_sects >> (BLOCK_SIZE_BITS - 9);
+	dev = MKDEV(hd->major, riscix_minor);
+
+	if (!(bh = bread(dev, 0, 1024)))
+		return -1;
+
+	rr = (struct riscix_record *)bh->b_data;
+	if (rr->magic == RISCIX_MAGIC) {
+		int part;
+
+		printk(" <");
+
+		for (part = 0; part < 8; part++) {
+			if (rr->part[part].one &&
+			    memcmp(rr->part[part].name, "All\0", 4)) {
+				add_gd_partition(hd, minor++,
+						rr->part[part].start,
+						rr->part[part].length);
+				printk("(%s)", rr->part[part].name);
+			}
+		}
+
+		printk(" >");
+
+		if (hd->part[riscix_minor].nr_sects > 2)
+			hd->part[riscix_minor].nr_sects = 2;
+	}
+
+	brelse(bh);
+	return minor;
+}
+#endif
+
+static int linux_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sect,
+			    unsigned int minor, unsigned long nr_sects)
+{
+	struct buffer_head *bh;
+	struct linux_part *linuxp;
+	unsigned int linux_minor, mask = (1 << hd->minor_shift) - 1;
+
+	printk(" [Linux]");
+
+	add_gd_partition(hd, linux_minor = minor++, first_sect, nr_sects);
+	hd->sizes[linux_minor] = hd->part[linux_minor].nr_sects >> (BLOCK_SIZE_BITS - 9);
+	dev = MKDEV(hd->major, linux_minor);
+
+	if (!(bh = bread(dev, 0, 1024)))
+		return -1;
+
+	linuxp = (struct linux_part *)bh->b_data;
+	printk(" <");
+	while (linuxp->magic == LINUX_NATIVE_MAGIC || linuxp->magic == LINUX_SWAP_MAGIC) {
+		if (!(minor & mask))
+			break;
+		add_gd_partition(hd, minor++, first_sect + linuxp->start_sect,
+			linuxp->nr_sects);
+		linuxp ++;
+	}
+	printk(" >");
+	/*
+	 * Prevent someone doing a mkswap or mkfs on this partition
+	 */
+	if(hd->part[linux_minor].nr_sects > 2)
+		hd->part[linux_minor].nr_sects = 2;
+
+	brelse(bh);
+	return minor;
+}
+
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+static int adfspart_check_CUMANA(struct gendisk *hd, kdev_t dev, unsigned long first_sector,
+				  unsigned int minor)
+{
+	unsigned int start_blk = 0, mask = (1 << hd->minor_shift) - 1;
+	struct buffer_head *bh = NULL;
+	char *name = "CUMANA/ADFS";
+	int first = 1;
+
+	/*
+	 * Try Cumana style partitions - sector 3 contains ADFS boot block with pointer
+	 * to next 'drive'.
+	 *
+	 * There are unknowns in this code - is the 'cylinder number' of the next
+	 * partition relative to the start of this one - I'm assuming it is.
+	 *
+	 * Also, which ID did Cumana use?
+	 *
+	 * This is totally unfinished, and will require more work to get it going.
+	 * Hence it is totally untested.
+	 */
+	do {
+		struct disc_record *dr;
+		unsigned int nr_sects;
+
+		if (!(minor & mask))
+			break;
+
+		if (!(bh = bread(dev, start_blk + 3, 1024)))
+			return -1;
+
+		dr = adfs_partition(hd, name, bh->b_data, first_sector, minor++);
+		if (!dr)
+			break;
+		name = NULL;
+
+		nr_sects = (bh->b_data[0x1fd] + (bh->b_data[0x1fe] << 8)) *
+			 (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) * dr->secspertrack;
+
+		if (!nr_sects)
+			break;
+
+		first = 0;
+		first_sector += nr_sects;
+		start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
+		nr_sects = 0; /* hmm - should be partition size */
+
+		switch (bh->b_data[0x1fc] & 15) {
+		case 0: /* No partition / ADFS? */
+			break;
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+		case PARTITION_RISCIX_SCSI: /* RiscIX - we don't know how to find the next one. */
+			minor = riscix_partition(hd, dev, first_sector, minor, nr_sects);
+			break;
+#endif
+
+		case PARTITION_LINUX:
+			minor = linux_partition(hd, dev, first_sector, minor, nr_sects);
+			break;
+		}
+		brelse(bh);
+		bh = NULL;
+		if (minor == -1)
+			return minor;
+	} while (1);
+	if (bh)
+		brelse(bh);
+	return first ? 0 : 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+/*
+ * Purpose: allocate ADFS partitions.
+ *
+ * Params : hd		- pointer to gendisk structure to store partition info.
+ *	    dev		- device number to access.
+ *	    first_sector- first readable sector on the device.
+ *	    minor	- first available minor on device.
+ *
+ * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
+ *
+ * Alloc  : hda  = whole drive
+ *	    hda1 = ADFS partition on first drive.
+ *	    hda2 = non-ADFS partition.
+ */
+static int adfspart_check_ADFS(struct gendisk *hd, kdev_t dev, unsigned long first_sector,
+				unsigned int minor)
+{
+	unsigned long start_sect, nr_sects, sectscyl, heads;
+	struct buffer_head *bh;
+	struct disc_record *dr;
+
+	if (!(bh = bread(dev, 3, 1024)))
+		return -1;
+
+	dr = adfs_partition(hd, "ADFS", bh->b_data, first_sector, minor++);
+	if (!dr) {
+	    	brelse(bh);
+    		return 0;
+	}
+
+	heads = dr->heads + ((dr->lowsector >> 6) & 1);
+	adfspart_setgeometry(dev, dr->secspertrack, heads, hd->part[MINOR(dev)].nr_sects);
+	sectscyl = dr->secspertrack * heads;
+
+	/*
+	 * Work out start of non-adfs partition.
+	 */
+	start_sect = ((bh->b_data[0x1fe] << 8) + bh->b_data[0x1fd]) * sectscyl;
+	nr_sects = hd->part[MINOR(dev)].nr_sects - start_sect;
+
+	if (start_sect) {
+		first_sector += start_sect;
+		/*
+		 * we now have a problem - how to set the origional disk size if the
+		 * disk doesn't report it, since there is no standard way of getting
+		 * that info.
+		 */
+		switch (bh->b_data[0x1fc] & 15) {
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+		case PARTITION_RISCIX_SCSI:
+		case PARTITION_RISCIX_MFM:
+			minor = riscix_partition(hd, dev, first_sector, minor, nr_sects);
+			break;
+#endif
+
+		case PARTITION_LINUX:
+			minor = linux_partition(hd, dev, first_sector, minor, nr_sects);
+			break;
+		}
+	}
+	brelse(bh);
+	return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ICS
+static int adfspart_check_ICSLinux(kdev_t dev, unsigned long block)
+{
+	struct buffer_head *bh;
+	unsigned int offset = block & 1 ? 512 : 0;
+	int result = 0;
+
+	bh = bread(dev, block >> 1, 1024);
+
+	if (bh != NULL) {
+		if (memcmp(bh->b_data + offset, "LinuxPart", 9) == 0)
+			result = 1;
+
+		brelse(bh);
+	}
+
+	return result;
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd		- pointer to gendisk structure to store partition info.
+ *	    dev		- device number to access.
+ *	    first_sector- first readable sector on the device.
+ *	    minor	- first available minor on device.
+ * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
+ * Alloc  : hda  = whole drive
+ *	    hda1 = ADFS partition 0 on first drive.
+ *	    hda2 = ADFS partition 1 on first drive.
+ *		..etc..
+ */
+static int adfspart_check_ICS(struct gendisk *hd, kdev_t dev, unsigned long first_sector,
+			       unsigned int minor)
+{
+	struct buffer_head *bh;
+	unsigned long sum;
+	unsigned int i, mask = (1 << hd->minor_shift) - 1;
+	struct ics_part { unsigned long start; signed long size; } *p;
+
+	/*
+	 * Try ICS style partitions - sector 0 contains partition info.
+	 */
+	if (!(bh = bread(dev, 0, 1024)))
+	    	return -1;
+
+	/*
+	 * check for a valid checksum
+	 */
+	for (i = 0, sum = 0x50617274; i < 508; i++)
+		sum += bh->b_data[i];
+
+	if (sum != *(unsigned long *)(&bh->b_data[508])) {
+	    	brelse(bh);
+		return 0; /* not ICS partition table */
+	}
+
+	printk(" [ICS]");
+
+	for (p = (struct ics_part *)bh->b_data; p->size; p++) {
+		if ((minor & mask) == 0)
+			break;
+
+		if (p->size < 0 && adfspart_check_ICSLinux(dev, p->start)) {
+			/*
+			 * We use the first sector to identify what type
+			 * this partition is...
+			 */
+			if (-p->size > 1)
+				add_gd_partition(hd, minor, first_sector + p->start + 1, -p->size - 1);
+		} else
+			add_gd_partition(hd, minor, first_sector + p->start, p->size);
+		minor++;
+	}
+
+	brelse(bh);
+	return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+struct ptec_partition {
+	u32 unused1;
+	u32 unused2;
+	u32 start;
+	u32 size;
+	u32 unused5;
+	char type[8];
+};
+	
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd		- pointer to gendisk structure to store partition info.
+ *	    dev		- device number to access.
+ *	    first_sector- first readable sector on the device.
+ *	    minor	- first available minor on device.
+ * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
+ * Alloc  : hda  = whole drive
+ *	    hda1 = ADFS partition 0 on first drive.
+ *	    hda2 = ADFS partition 1 on first drive.
+ *		..etc..
+ */
+static int adfspart_check_POWERTEC(struct gendisk *hd, kdev_t dev, unsigned long first_sector,
+				   unsigned int minor)
+{
+	struct buffer_head *bh;
+	struct ptec_partition *p;
+	unsigned char checksum;
+	int i;
+
+	if (!(bh = bread(dev, 0, 1024)))
+		return -1;
+
+	for (checksum = 0x2a, i = 0; i < 511; i++)
+		checksum += bh->b_data[i];
+
+	if (checksum != bh->b_data[511]) {
+		brelse(bh);
+		return 0;
+	}
+
+	printk(" [POWERTEC]");
+
+	for (i = 0, p = (struct ptec_partition *)bh->b_data; i < 12; i++, p++) {
+		if (p->size)
+			add_gd_partition(hd, minor, first_sector + p->start, p->size);
+		minor++;
+	}
+
+	brelse(bh);
+	return 1;
+}
+#endif
+
+/*
+ * Purpose: initialise all the partitions on an ADFS drive.
+ *          These may be other ADFS partitions or a Linux/RiscBSD/RiscIX
+ *	    partition.
+ *
+ * Params : hd		 - pointer to gendisk structure to store devices partitions.
+ *          dev		 - device number to access
+ *	    first_sector - first available sector on the disk.
+ *	    minor	 - first available minor on this device.
+ *
+ * Returns: -1 on error, 0 if not ADFS format, 1 if ok.
+ */
+int acorn_partition(struct gendisk *hd, kdev_t dev,
+		    unsigned long first_sector, int first_part_minor)
+{
+	int r = 0;
+
+#ifdef CONFIG_ACORN_PARTITION_ICS
+	if (r == 0)
+		r = adfspart_check_ICS(hd, dev, first_sector, first_part_minor);
+#endif
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+	if (r == 0)    
+		r = adfspart_check_CUMANA(hd, dev, first_sector, first_part_minor);
+#endif
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+	if (r == 0)
+		r = adfspart_check_ADFS(hd, dev, first_sector, first_part_minor);
+#endif
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+	if (r == 0)
+		r = adfspart_check_POWERTEC(hd, dev, first_sector, first_part_minor);
+#endif
+	if (r < 0)
+		printk(" unable to read boot sectors / partition sectors\n");
+	else if (r)
+		printk("\n");
+	return r;
+}