Adding upstream version 4.2.upstream/4.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 220 insertions, 0 deletions

diff --git a/super-gpt.c b/super-gpt.c
new file mode 100644
index 0000000..a1e9aa9
--- /dev/null
+++ b/super-gpt.c
@@ -0,0 +1,220 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2010 Neil Brown <neilb@suse.de>
+ *
+ *
+ *    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
+ *
+ *    Author: Neil Brown
+ *    Email: <neil@brown.name>
+ *
+ */
+
+/*
+ * 'gpt' is a pseudo metadata type for devices which have a
+ * GPT partition table.
+ *
+ * Obviously arrays cannot be created or assembled for this type.
+ * It is used to allow a new bare device to have an partition table
+ * added so the member partitions can then be included in other
+ * arrays as relevant.
+ *
+ * The meaning operations are:
+ * examine_super, but not brief_examine_super or export_examine
+ * load_super
+ * store_super
+ */
+
+#include "mdadm.h"
+#include "part.h"
+
+static void free_gpt(struct supertype *st)
+{
+	free(st->sb);
+	st->sb = NULL;
+}
+
+static void examine_gpt(struct supertype *st, char *homehost)
+{
+	struct GPT *gpt = st->sb + 512;
+	struct GPT_part_entry *gpe = st->sb + 1024;
+	unsigned int i;
+
+	printf("    GPT Magic : %llx\n", (unsigned long long)__le64_to_cpu(gpt->magic));
+	printf(" GPT Revision : %ld\n", (long)__le32_to_cpu(gpt->revision));
+	for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
+		printf("  Partition[%02d] : %12llu sectors at %12llu\n",
+		       i,
+		       (unsigned long long)__le64_to_cpu(gpe[i].starting_lba),
+		       (unsigned long long)__le64_to_cpu(gpe[i].ending_lba)-
+		       (unsigned long long)__le64_to_cpu(gpe[i].starting_lba)
+		       +1
+			);
+	}
+}
+
+static int load_gpt(struct supertype *st, int fd, char *devname)
+{
+	struct MBR *super;
+	struct GPT *gpt_head;
+	int to_read;
+	unsigned int sector_size;
+
+	free_gpt(st);
+
+	if (posix_memalign((void**)&super, 4096, 32*512) != 0) {
+		pr_err("could not allocate superblock\n");
+		return 1;
+	}
+
+	if (!get_dev_sector_size(fd, devname, &sector_size)) {
+		free(super);
+		return 1;
+	}
+
+	lseek(fd, 0, 0);
+	if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
+	no_read:
+		if (devname)
+			pr_err("Cannot read partition table on %s\n",
+				devname);
+		free(super);
+		return 1;
+	}
+
+	if (super->magic != MBR_SIGNATURE_MAGIC ||
+	    super->parts[0].part_type != MBR_GPT_PARTITION_TYPE) {
+	not_found:
+		if (devname)
+			pr_err("No partition table found on %s\n",
+				devname);
+		free(super);
+		return 1;
+	}
+	/* Set offset to second block (GPT header) */
+	lseek(fd, sector_size, SEEK_SET);
+	/* Seem to have GPT, load the header */
+	gpt_head = (struct GPT*)(super+1);
+	if (read(fd, gpt_head, sizeof(*gpt_head)) != sizeof(*gpt_head))
+		goto no_read;
+	if (gpt_head->magic != GPT_SIGNATURE_MAGIC)
+		goto not_found;
+	if (__le32_to_cpu(gpt_head->part_cnt) >= 128)
+		goto not_found;
+
+	to_read = __le32_to_cpu(gpt_head->part_cnt) * sizeof(struct GPT_part_entry);
+	to_read =  ((to_read+511)/512) * 512;
+	/* Set offset to third block (GPT entries) */
+	lseek(fd, sector_size*2, SEEK_SET);
+	if (read(fd, gpt_head+1, to_read) != to_read)
+		goto no_read;
+
+	st->sb = super;
+
+	if (st->ss == NULL) {
+		st->ss = &gpt;
+		st->minor_version = 0;
+		st->max_devs = 1;
+		st->info = NULL;
+	}
+	return 0;
+}
+
+static int store_gpt(struct supertype *st, int fd)
+{
+	/* FIXME should I save the boot loader */
+	/* need to write two copies! */
+	/* FIXME allow for blocks != 512 bytes
+	 *etc
+	 */
+	struct MBR *super = st->sb;
+	struct GPT *gpt;
+	int to_write;
+
+	gpt = (struct GPT*)(super+1);
+
+	to_write = __le32_to_cpu(gpt->part_cnt) * sizeof(struct GPT_part_entry);
+	to_write =  ((to_write+511)/512) * 512;
+
+	lseek(fd, 0, 0);
+	if (write(fd, st->sb, to_write) != to_write)
+		return 4;
+
+	fsync(fd);
+	ioctl(fd, BLKRRPART, 0);
+	return 0;
+}
+
+static void getinfo_gpt(struct supertype *st, struct mdinfo *info, char *map)
+{
+	struct GPT *gpt = st->sb + 512;
+	struct GPT_part_entry *gpe = st->sb + 1024;
+	unsigned int i;
+
+	memset(&info->array, 0, sizeof(info->array));
+	memset(&info->disk, 0, sizeof(info->disk));
+	strcpy(info->text_version, "gpt");
+	strcpy(info->name, "gpt");
+	info->component_size = 0;
+
+	for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
+		unsigned long long last =
+			(unsigned long long)__le64_to_cpu(gpe[i].ending_lba);
+		if (last > info->component_size)
+			info->component_size = last;
+	}
+}
+
+static struct supertype *match_metadata_desc(char *arg)
+{
+	struct supertype *st = xmalloc(sizeof(*st));
+
+	if (!st)
+		return st;
+	if (strcmp(arg, "gpt") != 0) {
+		free(st);
+		return NULL;
+	}
+
+	st->ss = &gpt;
+	st->info = NULL;
+	st->minor_version = 0;
+	st->max_devs = 1;
+	st->sb = NULL;
+	return st;
+}
+
+static int validate_geometry(struct supertype *st, int level,
+			     int layout, int raiddisks,
+			     int *chunk, unsigned long long size,
+			     unsigned long long data_offset,
+			     char *subdev, unsigned long long *freesize,
+			     int consistency_policy, int verbose)
+{
+	pr_err("gpt metadata cannot be used this way\n");
+	return 0;
+}
+
+struct superswitch gpt = {
+	.examine_super = examine_gpt,
+	.validate_geometry = validate_geometry,
+	.match_metadata_desc = match_metadata_desc,
+	.load_super = load_gpt,
+	.store_super = store_gpt,
+	.getinfo_super = getinfo_gpt,
+	.free_super = free_gpt,
+	.name = "gpt",
+};