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/*
*
* (C) Copyright IBM Corp. 2001, 2003
*
* 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
*
* Module: libgpt.so
*
* File: commit.c
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <plugin.h>
#include "gpt.h"
#include "checks.h"
#include "helpers.h"
#include "commit.h"
/*
* Called to convert a GPT header from disk format to the arch specific
* format.
*/
static void cpu_gpt_header_to_disk( gpt_header *gh )
{
gh->signature = CPU_TO_DISK64(gh->signature);
gh->version = CPU_TO_DISK32(gh->version);
gh->size = CPU_TO_DISK32(gh->size);
gh->crc = CPU_TO_DISK32(gh->crc);
gh->reserve = CPU_TO_DISK32(gh->reserve);
gh->my_lba = CPU_TO_DISK64(gh->my_lba);
gh->alternate_lba = CPU_TO_DISK64(gh->alternate_lba);
gh->start_useable = CPU_TO_DISK64(gh->start_useable);
gh->end_useable = CPU_TO_DISK64(gh->end_useable);
gh->disk_id.time_low = CPU_TO_DISK32(gh->disk_id.time_low);
gh->disk_id.time_mid = CPU_TO_DISK16(gh->disk_id.time_mid);
gh->disk_id.time_high = CPU_TO_DISK16(gh->disk_id.time_high);
gh->ptable_lba = CPU_TO_DISK64(gh->ptable_lba);
gh->ptable_count = CPU_TO_DISK32(gh->ptable_count);
gh->ptable_entry_size = CPU_TO_DISK32(gh->ptable_entry_size);
gh->ptable_crc = CPU_TO_DISK32(gh->ptable_crc);
}
/* UNCOMMENT FOR DEBUGGING
static void Display_GPT_Partition_Record( gpt_partition *part, int i)
{
if (part) {
LOG_DEBUG("GPT PARTITION INFO ...Minor= %d\n", i);
LOG_DEBUG(" Type ... \n");
LOG_DEBUG(" Time Low = 0x%X\n", DISK_TO_CPU32(part->type.time_low) );
LOG_DEBUG(" Time Mid = 0x%X\n", DISK_TO_CPU16(part->type.time_mid) );
LOG_DEBUG(" Time High = 0x%X\n", DISK_TO_CPU16(part->type.time_high) );
LOG_DEBUG(" Clk High = 0x%X\n", part->type.clock_seq_high );
LOG_DEBUG(" Clk Low = 0x%X\n", part->type.clock_seq_low );
LOG_DEBUG(" Node = %X %X %X %X %X %X\n",
part->type.node[0], part->type.node[1], part->type.node[2],
part->type.node[3], part->type.node[4], part->type.node[5] );
LOG_DEBUG(" ID ... \n");
LOG_DEBUG(" Time Low = 0x%X\n", DISK_TO_CPU32(part->id.time_low) );
LOG_DEBUG(" Time Mid = 0x%X\n", DISK_TO_CPU16(part->id.time_mid) );
LOG_DEBUG(" Time High = 0x%X\n", DISK_TO_CPU16(part->id.time_high) );
LOG_DEBUG(" Clk High = 0x%X\n", part->id.clock_seq_high );
LOG_DEBUG(" Clk Low = 0x%X\n", part->id.clock_seq_low );
LOG_DEBUG(" Node = %X %X %X %X %X %X\n",
part->id.node[0], part->id.node[1], part->id.node[2],
part->id.node[3], part->id.node[4], part->id.node[5] );
LOG_DEBUG(" Start LBA = %"PRIu64"\n", DISK_TO_CPU64(part->start));
LOG_DEBUG(" End LBA = %"PRIu64"\n", DISK_TO_CPU64(part->end));
}
}
*/
/*
* Called to walk a segment storage object list and return
* the metadata segment that corresponds to the commit phase.
*
* Returns: metadata segment ptr if successful
* null ptr if not successful
*/
static int build_gpt_partition_table_from_seglist( list_anchor_t seglist,
gpt_header *gh,
gpt_partition *ptable )
{
int rc = ENOSYS;
DISKSEG *seg=NULL;
SEG_PRIVATE_DATA *pdata=NULL;
gpt_partition *part=(gpt_partition *)malloc(gh->ptable_entry_size);
char *cptr=(char *)ptable;
list_element_t iter;
LOG_ENTRY();
if (seglist!=NULL && gh!=NULL && ptable !=NULL) {
rc = 0;
}
LIST_FOR_EACH( seglist, iter, seg ) {
if ( seg->data_type == DATA_TYPE ) {
memset(part,0,gh->ptable_entry_size);
pdata = (SEG_PRIVATE_DATA *)seg->private_data;
memcpy( &part->type, &pdata->guid_type, sizeof(guid_t) );
cpu_guid_to_disk( &part->type );
memcpy( &part->id, &pdata->guid_id, sizeof(guid_t) );
cpu_guid_to_disk( &part->id );
memcpy( &part->name, &pdata->name, sizeof(utf16_char_t)*GPT_PNAME_SIZE );
part->attributes = CPU_TO_DISK64(pdata->attributes);
part->start = CPU_TO_DISK64(seg->start);
part->end = CPU_TO_DISK64(seg->start + seg->size - 1);
cptr = ((char *)(ptable)) + (gh->ptable_entry_size * (pdata->minor-1));
memcpy(cptr, part, gh->ptable_entry_size);
}
}
/* UNCOMMENT FOR DEBUGGING
{
int i;
for (i=0, part=ptable; i<gh->ptable_count; i++) {
if (part->end != 0) {
Display_GPT_Partition_Record( part, i+1);
}
++part;
}
}
*/
LOG_EXIT_INT(rc);
return rc;
}
/*
* Called to walk a segment storage object list and return
* the metadata segment that corresponds to the commit phase.
*
* Returns: metadata segment ptr if successful
* null ptr if not successful
*/
static DISKSEG * get_metadata_seg_from_seglist( list_anchor_t seglist, uint phase )
{
DISKSEG *metadata=NULL;
DISKSEG *seg;
char *mstring;
list_element_t iter;
LIST_FOR_EACH( seglist, iter, seg ) {
if ( seg->data_type == META_DATA_TYPE ) {
mstring = strstr( seg->name, "metadata" ); // object called xxx_metadataN ?
if (mstring) {
if ( atoi(&mstring[8]) == phase) { // N == commit phase ?
metadata = seg;
break;
}
}
}
}
return metadata;
}
/*
* Called to commit a copy of the gpt header along with
* its corresponding partition table.
*
* Returns: 0 if successful
* error codes otherwise
*/
static int write_metadata(LOGICALDISK *ld, DISK_PRIVATE_DATA *disk_pdata,
storage_object_t *parent, uint phase, boolean backup)
{
int rc = EINVAL;
gpt_header *gh=NULL;
gpt_partition *ptable=NULL;
struct plugin_functions_s *DevFuncs;
u_int32_t crc;
DISKSEG *md;
u_int32_t gh_size = 0;
LOG_ENTRY();
//
// get metadata segment corresponding to the commit phase
// and use it to get gpt header
//
md = get_metadata_seg_from_seglist( ld->parent_objects, phase);
if (md) {
gh = (void *) calloc(1, EVMS_VSECTOR_SIZE );
if (gh) {
memcpy( gh,
((SEG_PRIVATE_DATA *)md->private_data)->gh,
((SEG_PRIVATE_DATA *)md->private_data)->gh->size );
}
}
if (gh) {
// build the gpt partition table
ptable = (gpt_partition *) calloc( 1, (md->size-1)*EVMS_VSECTOR_SIZE );
if (ptable) {
rc = build_gpt_partition_table_from_seglist( ld->parent_objects, gh, ptable );
}
else {
rc = ENOMEM;
}
DevFuncs = (struct plugin_functions_s *) ld->plugin->functions.plugin;
// commit the partition table
if (rc == 0) {
if (backup) {
rc = EngFncs->save_metadata( parent->name, ld->name,
gh->ptable_lba, (md->size - 1), ptable );
} else {
rc = DevFuncs->write( ld, gh->ptable_lba, (md->size - 1), (void *) ptable );
}
}
// commit the gpt header
if (rc == 0) {
crc = EngFncs->calculate_CRC( EVMS_INITIAL_CRC,
ptable,
gh->ptable_count * gh->ptable_entry_size);
gh->ptable_crc = ~crc;
gh_size = gh->size;
cpu_gpt_header_to_disk( gh );
gh->crc = 0;
crc = EngFncs->calculate_CRC( EVMS_INITIAL_CRC,
gh,
gh_size );
gh->crc = CPU_TO_DISK32(~crc);
if (backup) {
rc = EngFncs->save_metadata( parent->name, ld->name,
DISK_TO_CPU64(gh->my_lba), 1, gh );
} else {
rc = DevFuncs->write( ld, DISK_TO_CPU64(gh->my_lba), 1, (void *) gh );
}
}
}
if (ptable) free(ptable);
if (gh) free(gh);
LOG_EXIT_INT(rc);
return rc;
}
/*
* Called to commit the PMBR on the specified disk.
*
* Returns: 0 if successful
* error codes otherwise
*/
static int write_protective_mbr( LOGICALDISK *ld,
storage_object_t *parent,
boolean backup )
{
master_boot_record *boot_sector;
struct plugin_functions_s *DevFuncs=NULL;
int rc,i;
msdos_partition *part;
chs_t chs;
LOG_ENTRY();
boot_sector = (master_boot_record *) malloc(EVMS_VSECTOR_SIZE);
if (boot_sector) {
DevFuncs = (struct plugin_functions_s *) ld->plugin->functions.plugin;
rc = DevFuncs->read( ld, 0, 1, (void *) boot_sector );
if (rc == 0) {
boot_sector->signature = CPU_TO_DISK16(MSDOS_DISKMAGIC); // just to be sure
for (i=0; i<4; i++) memset(&boot_sector->partition_table[i], 0, sizeof(msdos_partition));
part = &boot_sector->partition_table[0];
SYS_IND(part) = GPT_PARTITION;
BOOT_IND(part) = 0;
START_LBA(part) = CPU_TO_DISK32( 1 );
NR_SECTS(part) = CPU_TO_DISK32( ld->size - 1 );
LBA_to_Ptable_CHS(ld, 1, &chs);
START_CYL(part) = (unsigned char) ( chs.cylinder & 0x000000ff);
START_HEADS(part) = (unsigned char) ( chs.head & 0x000000ff);
START_SECT(part) = (unsigned char) ( chs.sector & 0x0000003f ) |
(( chs.cylinder >> 2 ) & 0xC0) ;
LBA_to_Ptable_CHS(ld, (ld->size - 1 ) , &chs);
END_CYL(part) = (unsigned char) ( chs.cylinder & 0x000000ff);
END_HEADS(part) = (unsigned char) ( chs.head & 0x000000ff);
END_SECT(part) = (unsigned char) ( chs.sector & 0x0000003f ) |
(( chs.cylinder >> 2 ) & 0xC0) ;
LOG_DEBUG("Committing PMBR to disk ...\n");
if (backup) {
rc = EngFncs->save_metadata( parent->name, ld->name,
0, 1, boot_sector );
} else {
rc = DevFuncs->write( ld, 0, 1, (void *) boot_sector );
}
}
}
else {
rc = ENOMEM;
}
LOG_EXIT_INT(rc);
return rc;
}
/*
* Called by SEG_COMMIT() to write out partition tables and dlat tables for
* the specified disk.
*/
int commit_guid_partition_tables( LOGICALDISK *ld, storage_object_t *parent,
uint commit_phase, boolean backup )
{
int rc=0;
DISK_PRIVATE_DATA *disk_pdata;
LOG_ENTRY();
disk_pdata = get_gpt_disk_private_data(ld);
if (disk_pdata) {
switch (commit_phase) {
case 1:
rc = write_protective_mbr( ld, parent, backup );
if (rc == 0) {
rc = write_metadata(ld, disk_pdata, parent,
commit_phase, backup);
}
break;
case 2:
rc = write_metadata(ld, disk_pdata, parent,
commit_phase, backup);
break;
default:
LOG_DEBUG("nothing to do, commit phase = %d\n", commit_phase );
rc = 0;
break;
}
}
LOG_EXIT_INT(rc);
return rc;
}
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