Rewrite Write_Disk() so that it creates a GPT. Note that the code is

basicly untested, but the guts is all there. I need to free up a disk
before I give it a spin.

1 files changed, 363 insertions, 15 deletions

diff --git a/lib/libdisk/write_ia64_disk.c b/lib/libdisk/write_ia64_disk.c
index dcf3155..6c8b99c 100644
--- a/lib/libdisk/write_ia64_disk.c
+++ b/lib/libdisk/write_ia64_disk.c
@@ -1,31 +1,379 @@
 /*
- * ----------------------------------------------------------------------------
- * "THE BEER-WARE LICENSE" (Revision 42):
- * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
- * can do whatever you want with this stuff. If we meet some day, and you think
- * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
- * ----------------------------------------------------------------------------
+ * Copyright (c) 2003 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * CRC32 code derived from work by Gary S. Brown.
  */
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <string.h>
 #include <sys/types.h>
-#include <sys/stat.h>
 #include <sys/disklabel.h>
 #include <sys/diskmbr.h>
+#include <sys/gpt.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
 #include <paths.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <uuid.h>
+
 #include "libdisk.h"
 
+static uuid_t _efi = GPT_ENT_TYPE_EFI;
+static uuid_t _fbsd = GPT_ENT_TYPE_FREEBSD;
+static uuid_t _swap = GPT_ENT_TYPE_FREEBSD_SWAP;
+static uuid_t _ufs = GPT_ENT_TYPE_FREEBSD_UFS;
+
+static uint32_t crc32_tab[] = {
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+uint32_t
+crc32(const void *buf, size_t size)
+{
+	const uint8_t *p;
+	uint32_t crc;
+
+	p = buf;
+	crc = ~0U;
+
+	while (size--)
+		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+
+	return (crc ^ ~0U);
+}
+
+static int
+write_pmbr(int fd, const struct disk *disk)
+{
+	struct dos_partition dp;
+	char *buffer;
+	u_long nsects;
+	int error;
+
+	nsects = disk->media_size / disk->sector_size;
+	buffer = calloc(disk->sector_size, 1);
+	if (buffer == NULL)
+		return (ENOMEM);
+	buffer[DOSMAGICOFFSET] = DOSMAGIC & 0xff;
+	buffer[DOSMAGICOFFSET + 1] = DOSMAGIC >> 8;
+
+	dp.dp_flag = 0;
+	dp.dp_shd = dp.dp_ssect = dp.dp_scyl = 0xff;
+	dp.dp_typ = DOSPTYP_PMBR;
+	dp.dp_ehd = dp.dp_esect = dp.dp_ecyl = 0xff;
+	dp.dp_start = 1;
+	dp.dp_size = (nsects > 0xffffffffu) ? ~0u : nsects;
+	memcpy(buffer + DOSPARTOFF, &dp, DOSPARTSIZE);
+
+	if (lseek(fd, 0L, SEEK_SET) != 0L ||
+	    write(fd, buffer, disk->sector_size) != disk->sector_size)
+		error = (errno) ? errno : EAGAIN;
+
+	free(buffer);
+	return (error);
+}
+
+static int
+read_gpt(int fd, const struct disk *disk, struct gpt_hdr *hdr,
+    struct gpt_ent *tbl)
+{
+	char *buffer;
+	off_t off;
+	size_t nsects, sz;
+	int error, i;
+
+	nsects = disk->gpt_size * sizeof(struct gpt_ent) / disk->sector_size;
+	nsects++;
+	sz = nsects * disk->sector_size;
+	buffer = malloc(sz);
+	if (buffer == NULL)
+		return (ENOMEM);
+
+	if (lseek(fd, disk->sector_size, SEEK_SET) != disk->sector_size ||
+	    read(fd, buffer, disk->sector_size) != disk->sector_size) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	if (memcmp(buffer, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0) {
+		/*
+		 * No GPT on disk. Create one out of thin air.
+		 */
+		bzero(&hdr[0], sizeof(struct gpt_hdr));
+		memcpy(hdr[0].hdr_sig, GPT_HDR_SIG, sizeof(hdr[0].hdr_sig));
+		hdr[0].hdr_revision = GPT_HDR_REVISION;
+		hdr[0].hdr_size = offsetof(struct gpt_hdr, padding);
+		hdr[0].hdr_lba_self = 1;
+		hdr[0].hdr_lba_alt = disk->media_size / disk->sector_size - 1L;
+		hdr[0].hdr_lba_start = disk->lba_start;
+		hdr[0].hdr_lba_end = disk->lba_end;
+		uuid_create(&hdr[0].hdr_uuid, NULL);
+		hdr[0].hdr_lba_table = 2;
+		hdr[0].hdr_entries = disk->gpt_size;
+		hdr[0].hdr_entsz = sizeof(struct gpt_ent);
+		hdr[1] = hdr[0];
+		hdr[1].hdr_lba_self = hdr[0].hdr_lba_alt;
+		hdr[1].hdr_lba_alt = hdr[0].hdr_lba_self;
+		hdr[1].hdr_lba_table = disk->lba_end + 1;
+
+		for (i = 0; i < disk->gpt_size; i++) {
+			bzero(&tbl[i], sizeof(struct gpt_ent));
+			uuid_create(&tbl[i].ent_uuid, NULL);
+		}
+
+		error = 0;
+		goto bail;
+	}
+
+	/*
+	 * We have a GPT on disk. Read it.
+	 */
+	memcpy(&hdr[0], buffer, sizeof(struct gpt_hdr));
+	off = hdr->hdr_lba_table * disk->sector_size;
+	if (lseek(fd, off, SEEK_SET) != off ||
+	    read(fd, buffer, sz) != sz) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	memcpy(tbl, buffer, sizeof(struct gpt_ent) * disk->gpt_size);
+	off = hdr->hdr_lba_alt * disk->sector_size;
+	if (lseek(fd, off, SEEK_SET) != off ||
+	    read(fd, buffer, disk->sector_size) != disk->sector_size) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	memcpy(&hdr[1], buffer, sizeof(struct gpt_hdr));
+	error = 0;
+
+bail:
+	free(buffer);
+	return (error);
+}
+
+static int
+update_gpt(int fd, const struct disk *disk, struct gpt_hdr *hdr,
+    struct gpt_ent *tbl)
+{
+	char *buffer;
+	struct chunk *c;
+	off_t off;
+	size_t bufsz;
+	int error, idx;
+
+	idx = 0;
+	for (c = disk->chunks->part; c != NULL; c = c->next) {
+		if (!(c->flags & CHUNK_HAS_INDEX)) {
+			while (idx < disk->gpt_size &&
+			    !uuid_is_nil(&tbl[idx].ent_type, NULL))
+				idx++;
+			if (idx == disk->gpt_size)
+				return (ENOSPC);
+
+			switch (c->type) {
+			case freebsd:
+				tbl[idx].ent_type = _fbsd;
+				break;
+			case efi:
+				tbl[idx].ent_type = _efi;
+				break;
+			case part:
+				switch (c->subtype) {
+				case FS_SWAP:
+					tbl[idx].ent_type = _swap;
+					break;
+				case FS_BSDFFS:
+					tbl[idx].ent_type = _ufs;
+					break;
+				default:
+					return (EINVAL);
+				}
+				break;
+			default:
+				return (EINVAL);
+			}
+		} else
+			idx = CHUNK_FTOI(c->flags);
+
+		tbl[idx].ent_lba_start = c->offset / disk->sector_size;
+		tbl[idx].ent_lba_end = c->end / disk->sector_size;
+ 	}
+
+	hdr[0].hdr_crc_table = crc32(tbl,
+	    disk->gpt_size * sizeof(struct gpt_ent));
+	hdr[0].hdr_crc_self = 0;
+	hdr[0].hdr_crc_self = crc32(&hdr[0], hdr[0].hdr_size);
+
+	hdr[1].hdr_crc_table = hdr[0].hdr_crc_table;
+	hdr[1].hdr_crc_self = 0;
+	hdr[1].hdr_crc_self = crc32(&hdr[1], hdr[1].hdr_size);
+
+	/*
+	 * Write the new GPT back to the disk.
+	 */
+	bufsz = disk->gpt_size * sizeof(struct gpt_ent);
+	if (bufsz == 0 || bufsz % disk->sector_size)
+		bufsz += disk->sector_size;
+	bufsz = (bufsz / disk->sector_size) * disk->sector_size;
+	buffer = calloc(1, bufsz);
+
+	memcpy(buffer, &hdr[0], sizeof(struct gpt_hdr));
+	off = hdr[0].hdr_lba_self * disk->sector_size;
+	if (lseek(fd, off, SEEK_SET) != off ||
+	    write(fd, buffer, disk->sector_size) != disk->sector_size) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	memcpy(buffer, &hdr[1], sizeof(struct gpt_hdr));
+	off = hdr[1].hdr_lba_self * disk->sector_size;
+	if (lseek(fd, off, SEEK_SET) != off ||
+	    write(fd, buffer, disk->sector_size) != disk->sector_size) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	memcpy(buffer, tbl, disk->gpt_size * sizeof(struct gpt_ent));
+	off = hdr[0].hdr_lba_table * disk->sector_size;
+	if (lseek(fd, off, SEEK_SET) != off ||
+	    write(fd, buffer, bufsz) != bufsz) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	off = hdr[1].hdr_lba_table * disk->sector_size;
+	if (lseek(fd, off, SEEK_SET) != off ||
+	    write(fd, buffer, bufsz) != bufsz) {
+		error = (errno) ? errno : EAGAIN;
+		goto bail;
+	}
+	error = 0;
+
+bail:
+	free(buffer);
+	return (error);
+}
+
 int
-Write_Disk(const struct disk *d1)
+Write_Disk(const struct disk *disk)
 {
-	Debug_Disk((struct disk *)(intptr_t)d1);
-	abort();
+	char devname[64];
+	struct gpt_hdr *hdr;
+	struct gpt_ent *tbl;
+	int error, fd;
+
+	hdr = malloc(sizeof(struct gpt_hdr) * 2);
+	if (hdr == NULL)
+		return (ENOMEM);
+	tbl = malloc(sizeof(struct gpt_ent) * disk->gpt_size);
+	if (tbl == NULL) {
+		free(hdr);
+		return (ENOMEM);
+	}
+
+	snprintf(devname, sizeof(devname), "%s%s", _PATH_DEV, disk->name);
+	fd = open(devname, O_RDWR);
+	if (fd == -1) {
+		free(tbl);
+		free(hdr);
+		return (errno);
+	}
+
+	/*
+	 * We can always write the PMBR, because we reject disks that do not
+	 * have a PMBR and are not virgin.
+	 */
+	error = write_pmbr(fd, disk);
+	if (error)
+		goto bail;
+
+	/*
+	 * Read the existing GPT from disk or otherwise create one out of
+	 * thin air. This way we can preserve the UUIDs and the entry names
+	 * when updating it.
+	 */
+	error = read_gpt(fd, disk, hdr, tbl);
+	if (error)
+		goto bail;
+
+	/*
+	 * Update and write the in-memory copy of the GPT.
+	 */
+	error = update_gpt(fd, disk, hdr, tbl);
+	if (error)
+		goto bail;
+
 	return (0);
+
+bail:
+	close(fd);
+	free(tbl);
+	free(hdr);
+	return (error);
 }