~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2005 MySQL AB & Innobase Oy

   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; version 2 of the License.

   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 */

/*

  InnoDB offline file checksum utility.  85% of the code in this file

  was taken wholesale fron the InnoDB codebase.

  The final 15% was originally written by Mark Smith of Danga

  Interactive, Inc. <junior@danga.com>

  Published with a permission.

*/

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <stdint.h>

#include <inttypes.h>

/* all of these ripped from InnoDB code from MySQL 4.0.22 */

#define UT_HASH_RANDOM_MASK     1463735687

#define UT_HASH_RANDOM_MASK2    1653893711

#define FIL_PAGE_LSN          16 

#define FIL_PAGE_FILE_FLUSH_LSN 26

#define FIL_PAGE_OFFSET     4

#define FIL_PAGE_DATA       38

#define FIL_PAGE_END_LSN_OLD_CHKSUM 8

#define FIL_PAGE_SPACE_OR_CHKSUM 0

#define UNIV_PAGE_SIZE          (2 * 8192)

/* command line argument to do page checks (that's it) */

/* another argument to specify page ranges... seek to right spot and go from there */

/* innodb function in name; modified slightly to not have the ASM version (lots of #ifs that didn't apply) */

static uint32_t mach_read_from_4(unsigned char *b)

{

  return( ((uint32_t)(b[0]) << 24)

          + ((uint32_t)(b[1]) << 16)

          + ((uint32_t)(b[2]) << 8)

          + (uint32_t)(b[3])

          );

}

static uint32_t

ut_fold_uint32_t_pair(

/*===============*/

            /* out: folded value */

    uint32_t   n1, /* in: uint32_t */

    uint32_t   n2) /* in: uint32_t */

{

    return(((((n1 ^ n2 ^ UT_HASH_RANDOM_MASK2) << 8) + n1)

                        ^ UT_HASH_RANDOM_MASK) + n2);

}

static uint32_t

ut_fold_binary(

/*===========*/

            /* out: folded value */

    unsigned char*   str,    /* in: string of bytes */

    uint32_t   len)    /* in: length */

{

    uint32_t   i;

    uint32_t   fold= 0;

    for (i= 0; i < len; i++)

    {

      fold= ut_fold_uint32_t_pair(fold, (uint32_t)(*str));

      str++;

    }

    return(fold);

}

static uint32_t

buf_calc_page_new_checksum(

/*=======================*/

               /* out: checksum */

    unsigned char*    page) /* in: buffer page */

{

    uint32_t checksum;

    /* Since the fields FIL_PAGE_FILE_FLUSH_LSN and ..._ARCH_LOG_NO

    are written outside the buffer pool to the first pages of data

    files, we have to skip them in the page checksum calculation.

    We must also skip the field FIL_PAGE_SPACE_OR_CHKSUM where the

    checksum is stored, and also the last 8 bytes of page because

    there we store the old formula checksum. */

    checksum= ut_fold_binary(page + FIL_PAGE_OFFSET,

                             FIL_PAGE_FILE_FLUSH_LSN - FIL_PAGE_OFFSET)

            + ut_fold_binary(page + FIL_PAGE_DATA,

                             UNIV_PAGE_SIZE - FIL_PAGE_DATA

                             - FIL_PAGE_END_LSN_OLD_CHKSUM);

    checksum= checksum & 0xFFFFFFFF;

    return(checksum);

}

static uint32_t

buf_calc_page_old_checksum(

/*=======================*/

               /* out: checksum */

    unsigned char*    page) /* in: buffer page */

{

    uint32_t checksum;

    checksum= ut_fold_binary(page, FIL_PAGE_FILE_FLUSH_LSN);

    checksum= checksum & 0xFFFFFFFF;

    return(checksum);

}

int main(int argc, char **argv)

{

  FILE *f;                     /* our input file */

  unsigned char *p;                     /* storage of pages read */

  int bytes;                   /* bytes read count */

  uint32_t ct;                    /* current page number (0 based) */

  int now;                     /* current time */

  int lastt;                   /* last time */

  uint32_t oldcsum, oldcsumfield, csum, csumfield, logseq, logseqfield; /* uint32_ts for checksum storage */

  struct stat st;              /* for stat, if you couldn't guess */

  uint64_t size; /* size of file (has to be 64 bits) */

  uint32_t pages;                 /* number of pages in file */

  uint32_t start_page= 0, end_page= 0, use_end_page= 0; /* for starting and ending at certain pages */

  off_t offset= 0;

  int just_count= 0;          /* if true, just print page count */

  int verbose= 0;

  int debug= 0;

  int c;

  int fd;

  /* remove arguments */

  while ((c= getopt(argc, argv, "cvds:e:p:")) != -1)

  {

    switch (c)

    {

    case 'v':

      verbose= 1;

      break;

    case 'c':

      just_count= 1;

      break;

    case 's':

      start_page= atoi(optarg);

      break;

    case 'e':

      end_page= atoi(optarg);

      use_end_page= 1;

      break;

    case 'p':

      start_page= atoi(optarg);

      end_page= atoi(optarg);

      use_end_page= 1;

      break;

    case 'd':

      debug= 1;

      break;

    case ':':

      fprintf(stderr, "option -%c requires an argument\n", optopt);

      return 1;

      break;

    case '?':

      fprintf(stderr, "unrecognized option: -%c\n", optopt);

      return 1;

      break;

    }

  }

  /* debug implies verbose... */

  if (debug) verbose= 1;

  /* make sure we have the right arguments */

  if (optind >= argc)

  {

    printf("InnoDB offline file checksum utility.\n");

    printf("usage: %s [-c] [-s <start page>] [-e <end page>] [-p <page>] [-v] [-d] <filename>\n", argv[0]);

    printf("\t-c\tprint the count of pages in the file\n");

    printf("\t-s n\tstart on this page number (0 based)\n");

    printf("\t-e n\tend at this page number (0 based)\n");

    printf("\t-p n\tcheck only this page (0 based)\n");

    printf("\t-v\tverbose (prints progress every 5 seconds)\n");

    printf("\t-d\tdebug mode (prints checksums for each page)\n");

    return 1;

  }

  /* stat the file to get size and page count */

  if (stat(argv[optind], &st))

  {

    perror("error statting file");

    return 1;

  }

  size= st.st_size;

  pages= size / UNIV_PAGE_SIZE;

  if (just_count)

  {

    printf("%u\n", pages);

    return 0;

  }

  else if (verbose)

  {

    printf("file %s= %"PRIu64" bytes (%u pages)...\n", argv[1], size, pages);

    printf("checking pages in range %u to %u\n", start_page, use_end_page ? end_page : (pages - 1));

  }

  /* open the file for reading */

  f= fopen(argv[optind], "r");

  if (!f)

  {

    perror("error opening file");

    return 1;

  }

  /* seek to the necessary position */

  if (start_page)

  {

    fd= fileno(f);

    if (!fd)

    {

      perror("unable to obtain file descriptor number");

      return 1;

    }

    offset= (off_t)start_page * (off_t)UNIV_PAGE_SIZE;

    if (lseek(fd, offset, SEEK_SET) != offset)

    {

      perror("unable to seek to necessary offset");

      return 1;

    }

  }

  /* allocate buffer for reading (so we don't realloc every time) */

  p= (unsigned char *)malloc(UNIV_PAGE_SIZE);

  /* main checksumming loop */

  ct= start_page;

  lastt= 0;

  while (!feof(f))

  {

    bytes= fread(p, 1, UNIV_PAGE_SIZE, f);

    if (!bytes && feof(f)) return 0;

    if (bytes != UNIV_PAGE_SIZE)

    {

      fprintf(stderr, "bytes read (%d) doesn't match universal page size (%d)\n", bytes, UNIV_PAGE_SIZE);

      return 1;

    }

    /* check the "stored log sequence numbers" */

    logseq= mach_read_from_4(p + FIL_PAGE_LSN + 4);

    logseqfield= mach_read_from_4(p + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN_OLD_CHKSUM + 4);

    if (debug)

      printf("page %u: log sequence number: first = %u; second = %u\n", ct, logseq, logseqfield);

    if (logseq != logseqfield)

    {

      fprintf(stderr, "page %u invalid (fails log sequence number check)\n", ct);

      return 1;

    }

    /* check old method of checksumming */

    oldcsum= buf_calc_page_old_checksum(p);

    oldcsumfield= mach_read_from_4(p + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN_OLD_CHKSUM);

    if (debug)

      printf("page %u: old style: calculated = %u; recorded = %u\n", ct, oldcsum, oldcsumfield);

    if (oldcsumfield != mach_read_from_4(p + FIL_PAGE_LSN) && oldcsumfield != oldcsum)

    {

      fprintf(stderr, "page %u invalid (fails old style checksum)\n", ct);

      return 1;

    }

    /* now check the new method */

    csum= buf_calc_page_new_checksum(p);

    csumfield= mach_read_from_4(p + FIL_PAGE_SPACE_OR_CHKSUM);

    if (debug)

      printf("page %u: new style: calculated = %u; recorded = %u\n", ct, csum, csumfield);

    if (csumfield != 0 && csum != csumfield)

    {

      fprintf(stderr, "page %u invalid (fails new style checksum)\n", ct);

      return 1;

    }

    /* end if this was the last page we were supposed to check */

    if (use_end_page && (ct >= end_page))

      return 0;

    /* do counter increase and progress printing */

    ct++;

    if (verbose)

    {

      if (ct % 64 == 0)

      {

        now= time(0);

        if (!lastt) lastt= now;

        if (now - lastt >= 1)

        {

          printf("page %u okay: %.3f%% done\n", (ct - 1), (float) ct / pages * 100);

          lastt= now;

        }

      }

    }

  }

  return 0;

}