move fs/partitions to block/

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 675 insertions, 0 deletions

diff --git a/block/partitions/efi.c b/block/partitions/efi.c
new file mode 100644
index 000000000000..6296b403c67a
--- /dev/null
+++ b/block/partitions/efi.c
@@ -0,0 +1,675 @@
+/************************************************************
+ * EFI GUID Partition Table handling
+ *
+ * http://www.uefi.org/specs/
+ * http://www.intel.com/technology/efi/
+ *
+ * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
+ *   Copyright 2000,2001,2002,2004 Dell Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *
+ * TODO:
+ *
+ * Changelog:
+ * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
+ * - test for valid PMBR and valid PGPT before ever reading
+ *   AGPT, allow override with 'gpt' kernel command line option.
+ * - check for first/last_usable_lba outside of size of disk
+ *
+ * Tue  Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Ported to 2.5.7-pre1 and 2.5.7-dj2
+ * - Applied patch to avoid fault in alternate header handling
+ * - cleaned up find_valid_gpt
+ * - On-disk structure and copy in memory is *always* LE now - 
+ *   swab fields as needed
+ * - remove print_gpt_header()
+ * - only use first max_p partition entries, to keep the kernel minor number
+ *   and partition numbers tied.
+ *
+ * Mon  Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Removed __PRIPTR_PREFIX - not being used
+ *
+ * Mon  Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
+ *
+ * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Added compare_gpts().
+ * - moved le_efi_guid_to_cpus() back into this file.  GPT is the only
+ *   thing that keeps EFI GUIDs on disk.
+ * - Changed gpt structure names and members to be simpler and more Linux-like.
+ * 
+ * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
+ *
+ * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Changed function comments to DocBook style per Andreas Dilger suggestion.
+ *
+ * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Change read_lba() to use the page cache per Al Viro's work.
+ * - print u64s properly on all architectures
+ * - fixed debug_printk(), now Dprintk()
+ *
+ * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Style cleanups
+ * - made most functions static
+ * - Endianness addition
+ * - remove test for second alternate header, as it's not per spec,
+ *   and is unnecessary.  There's now a method to read/write the last
+ *   sector of an odd-sized disk from user space.  No tools have ever
+ *   been released which used this code, so it's effectively dead.
+ * - Per Asit Mallick of Intel, added a test for a valid PMBR.
+ * - Added kernel command line option 'gpt' to override valid PMBR test.
+ *
+ * Wed Jun  6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
+ * - added devfs volume UUID support (/dev/volumes/uuids) for
+ *   mounting file systems by the partition GUID. 
+ *
+ * Tue Dec  5 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Moved crc32() to linux/lib, added efi_crc32().
+ *
+ * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Replaced Intel's CRC32 function with an equivalent
+ *   non-license-restricted version.
+ *
+ * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Fixed the last_lba() call to return the proper last block
+ *
+ * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Thanks to Andries Brouwer for his debugging assistance.
+ * - Code works, detects all the partitions.
+ *
+ ************************************************************/
+#include <linux/crc32.h>
+#include <linux/ctype.h>
+#include <linux/math64.h>
+#include <linux/slab.h>
+#include "check.h"
+#include "efi.h"
+
+/* This allows a kernel command line option 'gpt' to override
+ * the test for invalid PMBR.  Not __initdata because reloading
+ * the partition tables happens after init too.
+ */
+static int force_gpt;
+static int __init
+force_gpt_fn(char *str)
+{
+	force_gpt = 1;
+	return 1;
+}
+__setup("gpt", force_gpt_fn);
+
+
+/**
+ * efi_crc32() - EFI version of crc32 function
+ * @buf: buffer to calculate crc32 of
+ * @len - length of buf
+ *
+ * Description: Returns EFI-style CRC32 value for @buf
+ * 
+ * This function uses the little endian Ethernet polynomial
+ * but seeds the function with ~0, and xor's with ~0 at the end.
+ * Note, the EFI Specification, v1.02, has a reference to
+ * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
+ */
+static inline u32
+efi_crc32(const void *buf, unsigned long len)
+{
+	return (crc32(~0L, buf, len) ^ ~0L);
+}
+
+/**
+ * last_lba(): return number of last logical block of device
+ * @bdev: block device
+ * 
+ * Description: Returns last LBA value on success, 0 on error.
+ * This is stored (by sd and ide-geometry) in
+ *  the part[0] entry for this disk, and is the number of
+ *  physical sectors available on the disk.
+ */
+static u64 last_lba(struct block_device *bdev)
+{
+	if (!bdev || !bdev->bd_inode)
+		return 0;
+	return div_u64(bdev->bd_inode->i_size,
+		       bdev_logical_block_size(bdev)) - 1ULL;
+}
+
+static inline int
+pmbr_part_valid(struct partition *part)
+{
+        if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
+            le32_to_cpu(part->start_sect) == 1UL)
+                return 1;
+        return 0;
+}
+
+/**
+ * is_pmbr_valid(): test Protective MBR for validity
+ * @mbr: pointer to a legacy mbr structure
+ *
+ * Description: Returns 1 if PMBR is valid, 0 otherwise.
+ * Validity depends on two things:
+ *  1) MSDOS signature is in the last two bytes of the MBR
+ *  2) One partition of type 0xEE is found
+ */
+static int
+is_pmbr_valid(legacy_mbr *mbr)
+{
+	int i;
+	if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
+                return 0;
+	for (i = 0; i < 4; i++)
+		if (pmbr_part_valid(&mbr->partition_record[i]))
+                        return 1;
+	return 0;
+}
+
+/**
+ * read_lba(): Read bytes from disk, starting at given LBA
+ * @state
+ * @lba
+ * @buffer
+ * @size_t
+ *
+ * Description: Reads @count bytes from @state->bdev into @buffer.
+ * Returns number of bytes read on success, 0 on error.
+ */
+static size_t read_lba(struct parsed_partitions *state,
+		       u64 lba, u8 *buffer, size_t count)
+{
+	size_t totalreadcount = 0;
+	struct block_device *bdev = state->bdev;
+	sector_t n = lba * (bdev_logical_block_size(bdev) / 512);
+
+	if (!buffer || lba > last_lba(bdev))
+                return 0;
+
+	while (count) {
+		int copied = 512;
+		Sector sect;
+		unsigned char *data = read_part_sector(state, n++, &sect);
+		if (!data)
+			break;
+		if (copied > count)
+			copied = count;
+		memcpy(buffer, data, copied);
+		put_dev_sector(sect);
+		buffer += copied;
+		totalreadcount +=copied;
+		count -= copied;
+	}
+	return totalreadcount;
+}
+
+/**
+ * alloc_read_gpt_entries(): reads partition entries from disk
+ * @state
+ * @gpt - GPT header
+ * 
+ * Description: Returns ptes on success,  NULL on error.
+ * Allocates space for PTEs based on information found in @gpt.
+ * Notes: remember to free pte when you're done!
+ */
+static gpt_entry *alloc_read_gpt_entries(struct parsed_partitions *state,
+					 gpt_header *gpt)
+{
+	size_t count;
+	gpt_entry *pte;
+
+	if (!gpt)
+		return NULL;
+
+	count = le32_to_cpu(gpt->num_partition_entries) *
+                le32_to_cpu(gpt->sizeof_partition_entry);
+	if (!count)
+		return NULL;
+	pte = kzalloc(count, GFP_KERNEL);
+	if (!pte)
+		return NULL;
+
+	if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba),
+                     (u8 *) pte,
+		     count) < count) {
+		kfree(pte);
+                pte=NULL;
+		return NULL;
+	}
+	return pte;
+}
+
+/**
+ * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
+ * @state
+ * @lba is the Logical Block Address of the partition table
+ * 
+ * Description: returns GPT header on success, NULL on error.   Allocates
+ * and fills a GPT header starting at @ from @state->bdev.
+ * Note: remember to free gpt when finished with it.
+ */
+static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state,
+					 u64 lba)
+{
+	gpt_header *gpt;
+	unsigned ssz = bdev_logical_block_size(state->bdev);
+
+	gpt = kzalloc(ssz, GFP_KERNEL);
+	if (!gpt)
+		return NULL;
+
+	if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) {
+		kfree(gpt);
+                gpt=NULL;
+		return NULL;
+	}
+
+	return gpt;
+}
+
+/**
+ * is_gpt_valid() - tests one GPT header and PTEs for validity
+ * @state
+ * @lba is the logical block address of the GPT header to test
+ * @gpt is a GPT header ptr, filled on return.
+ * @ptes is a PTEs ptr, filled on return.
+ *
+ * Description: returns 1 if valid,  0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ */
+static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
+			gpt_header **gpt, gpt_entry **ptes)
+{
+	u32 crc, origcrc;
+	u64 lastlba;
+
+	if (!ptes)
+		return 0;
+	if (!(*gpt = alloc_read_gpt_header(state, lba)))
+		return 0;
+
+	/* Check the GUID Partition Table signature */
+	if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
+		pr_debug("GUID Partition Table Header signature is wrong:"
+			 "%lld != %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->signature),
+			 (unsigned long long)GPT_HEADER_SIGNATURE);
+		goto fail;
+	}
+
+	/* Check the GUID Partition Table header size */
+	if (le32_to_cpu((*gpt)->header_size) >
+			bdev_logical_block_size(state->bdev)) {
+		pr_debug("GUID Partition Table Header size is wrong: %u > %u\n",
+			le32_to_cpu((*gpt)->header_size),
+			bdev_logical_block_size(state->bdev));
+		goto fail;
+	}
+
+	/* Check the GUID Partition Table CRC */
+	origcrc = le32_to_cpu((*gpt)->header_crc32);
+	(*gpt)->header_crc32 = 0;
+	crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
+
+	if (crc != origcrc) {
+		pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n",
+			 crc, origcrc);
+		goto fail;
+	}
+	(*gpt)->header_crc32 = cpu_to_le32(origcrc);
+
+	/* Check that the my_lba entry points to the LBA that contains
+	 * the GUID Partition Table */
+	if (le64_to_cpu((*gpt)->my_lba) != lba) {
+		pr_debug("GPT my_lba incorrect: %lld != %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->my_lba),
+			 (unsigned long long)lba);
+		goto fail;
+	}
+
+	/* Check the first_usable_lba and last_usable_lba are
+	 * within the disk.
+	 */
+	lastlba = last_lba(state->bdev);
+	if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
+		pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
+			 (unsigned long long)lastlba);
+		goto fail;
+	}
+	if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
+		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
+			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+			 (unsigned long long)lastlba);
+		goto fail;
+	}
+
+	/* Check that sizeof_partition_entry has the correct value */
+	if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
+		pr_debug("GUID Partitition Entry Size check failed.\n");
+		goto fail;
+	}
+
+	if (!(*ptes = alloc_read_gpt_entries(state, *gpt)))
+		goto fail;
+
+	/* Check the GUID Partition Entry Array CRC */
+	crc = efi_crc32((const unsigned char *) (*ptes),
+			le32_to_cpu((*gpt)->num_partition_entries) *
+			le32_to_cpu((*gpt)->sizeof_partition_entry));
+
+	if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
+		pr_debug("GUID Partitition Entry Array CRC check failed.\n");
+		goto fail_ptes;
+	}
+
+	/* We're done, all's well */
+	return 1;
+
+ fail_ptes:
+	kfree(*ptes);
+	*ptes = NULL;
+ fail:
+	kfree(*gpt);
+	*gpt = NULL;
+	return 0;
+}
+
+/**
+ * is_pte_valid() - tests one PTE for validity
+ * @pte is the pte to check
+ * @lastlba is last lba of the disk
+ *
+ * Description: returns 1 if valid,  0 on error.
+ */
+static inline int
+is_pte_valid(const gpt_entry *pte, const u64 lastlba)
+{
+	if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
+	    le64_to_cpu(pte->starting_lba) > lastlba         ||
+	    le64_to_cpu(pte->ending_lba)   > lastlba)
+		return 0;
+	return 1;
+}
+
+/**
+ * compare_gpts() - Search disk for valid GPT headers and PTEs
+ * @pgpt is the primary GPT header
+ * @agpt is the alternate GPT header
+ * @lastlba is the last LBA number
+ * Description: Returns nothing.  Sanity checks pgpt and agpt fields
+ * and prints warnings on discrepancies.
+ * 
+ */
+static void
+compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
+{
+	int error_found = 0;
+	if (!pgpt || !agpt)
+		return;
+	if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
+		printk(KERN_WARNING
+		       "GPT:Primary header LBA != Alt. header alternate_lba\n");
+		printk(KERN_WARNING "GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->my_lba),
+                       (unsigned long long)le64_to_cpu(agpt->alternate_lba));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
+		printk(KERN_WARNING
+		       "GPT:Primary header alternate_lba != Alt. header my_lba\n");
+		printk(KERN_WARNING "GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+                       (unsigned long long)le64_to_cpu(agpt->my_lba));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->first_usable_lba) !=
+            le64_to_cpu(agpt->first_usable_lba)) {
+		printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
+		printk(KERN_WARNING "GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
+                       (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->last_usable_lba) !=
+            le64_to_cpu(agpt->last_usable_lba)) {
+		printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
+		printk(KERN_WARNING "GPT:%lld != %lld\n",
+		       (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
+                       (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
+		error_found++;
+	}
+	if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
+		printk(KERN_WARNING "GPT:disk_guids don't match.\n");
+		error_found++;
+	}
+	if (le32_to_cpu(pgpt->num_partition_entries) !=
+            le32_to_cpu(agpt->num_partition_entries)) {
+		printk(KERN_WARNING "GPT:num_partition_entries don't match: "
+		       "0x%x != 0x%x\n",
+		       le32_to_cpu(pgpt->num_partition_entries),
+		       le32_to_cpu(agpt->num_partition_entries));
+		error_found++;
+	}
+	if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
+            le32_to_cpu(agpt->sizeof_partition_entry)) {
+		printk(KERN_WARNING
+		       "GPT:sizeof_partition_entry values don't match: "
+		       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->sizeof_partition_entry),
+		       le32_to_cpu(agpt->sizeof_partition_entry));
+		error_found++;
+	}
+	if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
+            le32_to_cpu(agpt->partition_entry_array_crc32)) {
+		printk(KERN_WARNING
+		       "GPT:partition_entry_array_crc32 values don't match: "
+		       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->partition_entry_array_crc32),
+		       le32_to_cpu(agpt->partition_entry_array_crc32));
+		error_found++;
+	}
+	if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
+		printk(KERN_WARNING
+		       "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
+		printk(KERN_WARNING "GPT:%lld != %lld\n",
+			(unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+			(unsigned long long)lastlba);
+		error_found++;
+	}
+
+	if (le64_to_cpu(agpt->my_lba) != lastlba) {
+		printk(KERN_WARNING
+		       "GPT:Alternate GPT header not at the end of the disk.\n");
+		printk(KERN_WARNING "GPT:%lld != %lld\n",
+			(unsigned long long)le64_to_cpu(agpt->my_lba),
+			(unsigned long long)lastlba);
+		error_found++;
+	}
+
+	if (error_found)
+		printk(KERN_WARNING
+		       "GPT: Use GNU Parted to correct GPT errors.\n");
+	return;
+}
+
+/**
+ * find_valid_gpt() - Search disk for valid GPT headers and PTEs
+ * @state
+ * @gpt is a GPT header ptr, filled on return.
+ * @ptes is a PTEs ptr, filled on return.
+ * Description: Returns 1 if valid, 0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ * Validity depends on PMBR being valid (or being overridden by the
+ * 'gpt' kernel command line option) and finding either the Primary
+ * GPT header and PTEs valid, or the Alternate GPT header and PTEs
+ * valid.  If the Primary GPT header is not valid, the Alternate GPT header
+ * is not checked unless the 'gpt' kernel command line option is passed.
+ * This protects against devices which misreport their size, and forces
+ * the user to decide to use the Alternate GPT.
+ */
+static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
+			  gpt_entry **ptes)
+{
+	int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
+	gpt_header *pgpt = NULL, *agpt = NULL;
+	gpt_entry *pptes = NULL, *aptes = NULL;
+	legacy_mbr *legacymbr;
+	u64 lastlba;
+
+	if (!ptes)
+		return 0;
+
+	lastlba = last_lba(state->bdev);
+        if (!force_gpt) {
+                /* This will be added to the EFI Spec. per Intel after v1.02. */
+                legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
+                if (legacymbr) {
+                        read_lba(state, 0, (u8 *) legacymbr,
+				 sizeof (*legacymbr));
+                        good_pmbr = is_pmbr_valid(legacymbr);
+                        kfree(legacymbr);
+                }
+                if (!good_pmbr)
+                        goto fail;
+        }
+
+	good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA,
+				 &pgpt, &pptes);
+        if (good_pgpt)
+		good_agpt = is_gpt_valid(state,
+					 le64_to_cpu(pgpt->alternate_lba),
+					 &agpt, &aptes);
+        if (!good_agpt && force_gpt)
+                good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
+
+        /* The obviously unsuccessful case */
+        if (!good_pgpt && !good_agpt)
+                goto fail;
+
+        compare_gpts(pgpt, agpt, lastlba);
+
+        /* The good cases */
+        if (good_pgpt) {
+                *gpt  = pgpt;
+                *ptes = pptes;
+                kfree(agpt);
+                kfree(aptes);
+                if (!good_agpt) {
+                        printk(KERN_WARNING 
+			       "Alternate GPT is invalid, "
+                               "using primary GPT.\n");
+                }
+                return 1;
+        }
+        else if (good_agpt) {
+                *gpt  = agpt;
+                *ptes = aptes;
+                kfree(pgpt);
+                kfree(pptes);
+                printk(KERN_WARNING 
+                       "Primary GPT is invalid, using alternate GPT.\n");
+                return 1;
+        }
+
+ fail:
+        kfree(pgpt);
+        kfree(agpt);
+        kfree(pptes);
+        kfree(aptes);
+        *gpt = NULL;
+        *ptes = NULL;
+        return 0;
+}
+
+/**
+ * efi_partition(struct parsed_partitions *state)
+ * @state
+ *
+ * Description: called from check.c, if the disk contains GPT
+ * partitions, sets up partition entries in the kernel.
+ *
+ * If the first block on the disk is a legacy MBR,
+ * it will get handled by msdos_partition().
+ * If it's a Protective MBR, we'll handle it here.
+ *
+ * We do not create a Linux partition for GPT, but
+ * only for the actual data partitions.
+ * Returns:
+ * -1 if unable to read the partition table
+ *  0 if this isn't our partition table
+ *  1 if successful
+ *
+ */
+int efi_partition(struct parsed_partitions *state)
+{
+	gpt_header *gpt = NULL;
+	gpt_entry *ptes = NULL;
+	u32 i;
+	unsigned ssz = bdev_logical_block_size(state->bdev) / 512;
+	u8 unparsed_guid[37];
+
+	if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
+		kfree(gpt);
+		kfree(ptes);
+		return 0;
+	}
+
+	pr_debug("GUID Partition Table is valid!  Yea!\n");
+
+	for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
+		struct partition_meta_info *info;
+		unsigned label_count = 0;
+		unsigned label_max;
+		u64 start = le64_to_cpu(ptes[i].starting_lba);
+		u64 size = le64_to_cpu(ptes[i].ending_lba) -
+			   le64_to_cpu(ptes[i].starting_lba) + 1ULL;
+
+		if (!is_pte_valid(&ptes[i], last_lba(state->bdev)))
+			continue;
+
+		put_partition(state, i+1, start * ssz, size * ssz);
+
+		/* If this is a RAID volume, tell md */
+		if (!efi_guidcmp(ptes[i].partition_type_guid,
+				 PARTITION_LINUX_RAID_GUID))
+			state->parts[i + 1].flags = ADDPART_FLAG_RAID;
+
+		info = &state->parts[i + 1].info;
+		/* Instead of doing a manual swap to big endian, reuse the
+		 * common ASCII hex format as the interim.
+		 */
+		efi_guid_unparse(&ptes[i].unique_partition_guid, unparsed_guid);
+		part_pack_uuid(unparsed_guid, info->uuid);
+
+		/* Naively convert UTF16-LE to 7 bits. */
+		label_max = min(sizeof(info->volname) - 1,
+				sizeof(ptes[i].partition_name));
+		info->volname[label_max] = 0;
+		while (label_count < label_max) {
+			u8 c = ptes[i].partition_name[label_count] & 0xff;
+			if (c && !isprint(c))
+				c = '!';
+			info->volname[label_count] = c;
+			label_count++;
+		}
+		state->parts[i + 1].has_info = true;
+	}
+	kfree(ptes);
+	kfree(gpt);
+	strlcat(state->pp_buf, "\n", PAGE_SIZE);
+	return 1;
+}