Add gpt pseudo-metadata
This allows mdadm to work with gpt metadata to a limited extent. Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
parent
0f22b998fb
commit
0592faeb5e
10
Makefile
10
Makefile
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@ -99,7 +99,7 @@ OBJS = mdadm.o config.o policy.o mdstat.o ReadMe.o util.o Manage.o Assemble.o
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Create.o Detail.o Examine.o Grow.o Monitor.o dlink.o Kill.o Query.o \
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Incremental.o \
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mdopen.o super0.o super1.o super-ddf.o super-intel.o bitmap.o \
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super-mbr.o \
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super-mbr.o super-gpt.o \
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restripe.o sysfs.o sha1.o mapfile.o crc32.o sg_io.o msg.o \
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platform-intel.o probe_roms.o
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@ -107,7 +107,7 @@ SRCS = mdadm.c config.c policy.c mdstat.c ReadMe.c util.c Manage.c Assemble.c
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Create.c Detail.c Examine.c Grow.c Monitor.c dlink.c Kill.c Query.c \
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Incremental.c \
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mdopen.c super0.c super1.c super-ddf.c super-intel.c bitmap.c \
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super-mbr.c \
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super-mbr.c super-gpt.c \
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restripe.c sysfs.c sha1.c mapfile.c crc32.c sg_io.c msg.c \
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platform-intel.c probe_roms.c
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@ -115,13 +115,13 @@ INCL = mdadm.h part.h bitmap.h
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MON_OBJS = mdmon.o monitor.o managemon.o util.o mdstat.o sysfs.o config.o policy.o \
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Kill.o sg_io.o dlink.o ReadMe.o super0.o super1.o super-intel.o \
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super-mbr.o \
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super-mbr.o super-gpt.o \
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super-ddf.o sha1.o crc32.o msg.o bitmap.o \
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platform-intel.o probe_roms.o
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MON_SRCS = mdmon.c monitor.c managemon.c util.c mdstat.c sysfs.c config.c policy.c \
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Kill.c sg_io.c dlink.c ReadMe.c super0.c super1.c super-intel.c \
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super-mbr.c \
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super-mbr.c super-gpt.c \
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super-ddf.c sha1.c crc32.c msg.c bitmap.c \
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platform-intel.c probe_roms.c
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@ -130,7 +130,7 @@ STATICOBJS = pwgr.o
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ASSEMBLE_SRCS := mdassemble.c Assemble.c Manage.c config.c policy.c dlink.c util.c \
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super0.c super1.c super-ddf.c super-intel.c sha1.c crc32.c sg_io.c mdstat.c \
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platform-intel.c probe_roms.c sysfs.c super-mbr.c
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platform-intel.c probe_roms.c sysfs.c super-mbr.c super-gpt.c
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ASSEMBLE_AUTO_SRCS := mdopen.c
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ASSEMBLE_FLAGS:= $(CFLAGS) -DMDASSEMBLE
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ifdef MDASSEMBLE_AUTO
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2
mdadm.h
2
mdadm.h
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@ -675,7 +675,7 @@ extern struct superswitch {
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extern struct superswitch super0, super1;
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extern struct superswitch super_imsm, super_ddf;
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extern struct superswitch mbr;
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extern struct superswitch mbr, gpt;
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struct metadata_update {
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int len;
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@ -0,0 +1,219 @@
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/*
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2010 Neil Brown <neilb@suse.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Neil Brown
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* Email: <neil@brown.name>
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*
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*/
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/*
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* 'gpt' is a pseudo metadata type for devices which have a
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* GPT partition table.
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*
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* Obviously arrays cannot be created or assembled for this type.
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* It is used to allow a new bare device to have an partition table
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* added so the member partitions can then be included in other
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* arrays as relevant.
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*
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* The meaning operations are:
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* examine_super, but not brief_examine_super or export_examine
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* load_super
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* store_super
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*/
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#include "mdadm.h"
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#include "part.h"
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static void free_gpt(struct supertype *st)
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{
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free(st->sb);
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st->sb = NULL;
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}
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#ifndef MDASSEMBLE
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static void examine_gpt(struct supertype *st, char *homehost)
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{
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struct GPT *gpt = st->sb + 512;
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struct GPT_part_entry *gpe = st->sb + 1024;
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unsigned int i;
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printf(" GPT Magic : %llx\n", (unsigned long long)__le64_to_cpu(gpt->magic));
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printf(" GPT Revision : %ld\n", (long)__le32_to_cpu(gpt->revision));
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for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
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printf(" Partition[%02d] : %12llu sectors at %12llu\n",
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i,
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(unsigned long long)__le64_to_cpu(gpe[i].starting_lba),
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(unsigned long long)__le64_to_cpu(gpe[i].ending_lba)-
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(unsigned long long)__le64_to_cpu(gpe[i].starting_lba)
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+1
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);
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}
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}
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#endif /* MDASSEMBLE */
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static int load_gpt(struct supertype *st, int fd, char *devname)
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{
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struct MBR *super;
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struct GPT *gpt_head;
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int to_read;
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free_gpt(st);
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if (st->subarray[0])
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return 1;
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if (posix_memalign((void**)&super, 512, 32*512) != 0) {
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fprintf(stderr, Name ": %s could not allocate superblock\n",
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__func__);
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return 1;
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}
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ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
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lseek(fd, 0, 0);
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if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
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no_read:
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if (devname)
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fprintf(stderr, Name ": Cannot read partition table on %s\n",
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devname);
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free(super);
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return 1;
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}
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if (super->magic != MBR_SIGNATURE_MAGIC ||
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super->parts[0].part_type != MBR_GPT_PARTITION_TYPE) {
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not_found:
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if (devname)
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fprintf(stderr, Name ": No partition table found on %s\n",
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devname);
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free(super);
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return 1;
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}
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/* Seem to have GPT, load the header */
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gpt_head = (struct GPT*)(super+1);
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if (read(fd, gpt_head, sizeof(*gpt_head)) != sizeof(*gpt_head))
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goto no_read;
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if (gpt_head->magic != GPT_SIGNATURE_MAGIC)
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goto not_found;
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if (__le32_to_cpu(gpt_head->part_cnt) >= 128)
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goto not_found;
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to_read = __le32_to_cpu(gpt_head->part_cnt) * sizeof(struct GPT_part_entry);
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to_read = ((to_read+511)/512) * 512;
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if (read(fd, gpt_head+1, to_read) != to_read)
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goto no_read;
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st->sb = super;
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if (st->ss == NULL) {
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st->ss = &gpt;
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st->minor_version = 0;
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st->max_devs = 1;
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st->info = NULL;
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}
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return 0;
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}
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static int store_gpt(struct supertype *st, int fd)
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{
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/* FIXME should I save the boot loader */
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/* need to write two copies! */
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/* FIXME allow for blocks != 512 bytes
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*etc
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*/
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struct MBR *super = st->sb;
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struct GPT *gpt;
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int to_write;
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gpt = (struct GPT*)(super+1);
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to_write = __le32_to_cpu(gpt->part_cnt) * sizeof(struct GPT_part_entry);
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to_write = ((to_write+511)/512) * 512;
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lseek(fd, 0, 0);
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if (write(fd, st->sb, to_write) != to_write)
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return 4;
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fsync(fd);
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ioctl(fd, BLKRRPART, 0);
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return 0;
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}
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static void getinfo_gpt(struct supertype *st, struct mdinfo *info)
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{
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struct GPT *gpt = st->sb + 512;
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struct GPT_part_entry *gpe = st->sb + 1024;
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unsigned int i;
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memset(&info->array, 0, sizeof(info->array));
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memset(&info->disk, 0, sizeof(info->disk));
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strcpy(info->text_version, "gpt");
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strcpy(info->name, "gpt");
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info->component_size = 0;
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for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
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unsigned long long last =
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(unsigned long long)__le64_to_cpu(gpe[i].ending_lba);
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if (last > info->component_size)
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info->component_size = last;
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}
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}
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static struct supertype *match_metadata_desc(char *arg)
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{
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struct supertype *st = malloc(sizeof(*st));
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if (!st)
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return st;
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if (strcmp(arg, "gpt") != 0)
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return NULL;
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st->ss = &gpt;
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st->info = NULL;
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st->minor_version = 0;
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st->max_devs = 1;
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st->sb = NULL;
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return st;
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}
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#ifndef MDASSEMBLE
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static int validate_geometry(struct supertype *st, int level,
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int layout, int raiddisks,
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int chunk, unsigned long long size,
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char *subdev, unsigned long long *freesize,
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int verbose)
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{
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fprintf(stderr, Name ": gpt metadata cannot be used this way\n");
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return 0;
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}
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#endif
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struct superswitch gpt = {
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#ifndef MDASSEMBLE
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.examine_super = examine_gpt,
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#endif
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.validate_geometry = validate_geometry,
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.match_metadata_desc = match_metadata_desc,
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.load_super = load_gpt,
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.store_super = store_gpt,
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.getinfo_super = getinfo_gpt,
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.free_super = free_gpt,
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.name = "gpt",
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};
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