ddf1_lib.c

/*
 * SNIA DDF1 v1.0 metadata format handler.
 *
 * Copyright (C) 2005-2006 IBM, All rights reserved.
 * Written by Darrick Wong <djwong@us.ibm.com>
 *
 * Copyright (C) 2006 Heinz Mauelshagen, Red Hat GmbH
 *                    All rights reserved.
 *
 * See file LICENSE at the top of this source tree for license information.
 */

#include "internal.h"

#define     FORMAT_HANDLER
#include "ddf1.h"
#include "ddf1_lib.h"

#define DM_BYTEORDER_SWAB
#include <datastruct/byteorder.h>

/* Figure out what endian conversions we need */
int ddf1_endianness(struct lib_context *lc, struct ddf1 *ddf1)
{
      uint8_t *ptr = (uint8_t*) &ddf1->anchor.signature;

      if (ptr[0] == 0xDE && ptr[1] == 0x11)
            return BIG_ENDIAN;
      else if (ptr[0] == 0x11 && ptr[1] == 0xDE)
            return LITTLE_ENDIAN;
      else
            LOG_ERR(lc, -EINVAL, "Can't figure out endianness!");
}

/* Find the beginning of all DDF metadata */
uint64_t ddf1_beginning(struct ddf1 *ddf1)
{
      uint64_t start;
      struct ddf1_header *h = &ddf1->anchor;

      start = ddf1->anchor_offset;
      if (h->primary_table_lba < start)
            start = h->primary_table_lba;
      if (h->secondary_table_lba < start)
            start = h->secondary_table_lba;
#ifdef WORKSPACE_IS_PART_OF_DDF
      if (ddf1->primary->workspace_lba < start)
            start = ddf1->primary->workspace_lba;
#endif

      return start;
}

/* Helper for CR_OFF */
uint16_t ddf1_cr_off_maxpds_helper(struct ddf1 *ddf1)
{
      struct ddf1_header *h = ddf1->primary;

      /* The 0xFFFF nonsense is a weird Adaptec quirk */
//    bz211016
//    return (h->max_primary_elements == 0xFFFF && ddf1->adaptec_mode) ?
      return (h->max_primary_elements == 0xFFFF) ?
            h->max_phys_drives : h->max_primary_elements;
}

/* Process DDF1 records depending on type */
int ddf1_process_records(struct lib_context *lc, struct dev_info *di,
                   struct ddf1_record_handler *handler,
                   struct ddf1 *ddf1, int in_cpu_format)
{
      unsigned int i, cfgs = NUM_CONFIG_ENTRIES(ddf1);
      uint32_t x;

      for (i = 0; i < cfgs; i++) {
            x = *((uint32_t*) CR(ddf1, i));
            if (!in_cpu_format &&
                BYTE_ORDER != ddf1->disk_format)
                  CVT32(x);

            switch (x) {
                  case DDF1_VD_CONFIG_REC:
                        if (!handler->vd(lc, di, ddf1, i))
                              return 0;

                        break;

                  case DDF1_SPARE_REC:
                        if (!handler->spare(lc, di, ddf1, i))
                              return 0;

                        break;

                  case 0: /* Adaptec puts zero in this field??? */
                  case DDF1_INVALID:
                        break;

                  default:
                        log_warn(lc, "%s: Unknown config record %d.",
                               di->path, x);
            }
      }

      return 1;
}