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getsize.c

/*
 * getsize.c --- get the size of a partition.
 * 
 * Copyright (C) 1995, 1995 Theodore Ts'o.
 * Copyright (C) 2003 VMware, Inc.
 *
 * Windows version of ext2fs_get_device_size by Chris Li, VMware.
 * 
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

/* Modified for OCFS2 by Manish Singh <manish.singh@oracle.com> */

#define HAVE_UNISTD_H 1
#define HAVE_ERRNO_H 1
#define HAVE_LINUX_FD_H 1
#define HAVE_OPEN64 1
#define HAVE_SYS_IOCTL_H 1
#define HAVE_SYS_STAT_H 1
#define HAVE_FSTAT64 1

#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE

#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_LINUX_FD_H
#include <linux/fd.h>
#endif
#ifdef HAVE_SYS_DISKLABEL_H
#include <sys/disklabel.h>
#endif
#ifdef HAVE_SYS_DISK_H
#ifdef HAVE_SYS_QUEUE_H
#include <sys/queue.h> /* for LIST_HEAD */
#endif
#include <sys/disk.h>
#endif
#ifdef __linux__
#include <sys/utsname.h>
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE)
#define BLKGETSIZE _IO(0x12,96)     /* return device size */
#endif

#if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)
#define BLKGETSIZE64 _IOR(0x12,114,size_t)      /* return device size in bytes (u64 *arg) */
#endif

#ifdef APPLE_DARWIN
#define BLKGETSIZE DKIOCGETBLOCKCOUNT32
#endif /* APPLE_DARWIN */

#include "ocfs2.h"

#if defined(__CYGWIN__) || defined (WIN32)
#include "windows.h"
#include "winioctl.h"

#if (_WIN32_WINNT >= 0x0500)
#define HAVE_GET_FILE_SIZE_EX 1
#endif

errcode_t ocfs2_get_device_size(const char *file, int blocksize,
                        uint64_t *retblocks)
{
      HANDLE dev;
      PARTITION_INFORMATION pi;
      DISK_GEOMETRY gi;
      DWORD retbytes;
#ifdef HAVE_GET_FILE_SIZE_EX
      LARGE_INTEGER filesize;
#else
      DWORD filesize;
#endif /* HAVE_GET_FILE_SIZE_EX */

      dev = CreateFile(file, GENERIC_READ, 
                   FILE_SHARE_READ | FILE_SHARE_WRITE ,
                   NULL,  OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,  NULL); 
 
      if (dev == INVALID_HANDLE_VALUE)
            return EBADF;
      if (DeviceIoControl(dev, IOCTL_DISK_GET_PARTITION_INFO,
                      &pi, sizeof(PARTITION_INFORMATION),
                      &pi, sizeof(PARTITION_INFORMATION),
                      &retbytes, NULL)) {

            *retblocks = pi.PartitionLength.QuadPart / blocksize;
      
      } else if (DeviceIoControl(dev, IOCTL_DISK_GET_DRIVE_GEOMETRY,
                        &gi, sizeof(DISK_GEOMETRY),
                        &gi, sizeof(DISK_GEOMETRY),
                        &retbytes, NULL)) {

            *retblocks = gi.BytesPerSector *
                       gi.SectorsPerTrack *
                       gi.TracksPerCylinder *
                       gi.Cylinders.QuadPart / blocksize;

#ifdef HAVE_GET_FILE_SIZE_EX
      } else if (GetFileSizeEx(dev, &filesize)) {
            *retblocks = filesize.QuadPart / blocksize;
      }
#else
      } else {
            filesize = GetFileSize(dev, NULL);
            if (INVALID_FILE_SIZE != filesize) {
                  *retblocks = filesize / blocksize;
            }
      }
#endif /* HAVE_GET_FILE_SIZE_EX */

      CloseHandle(dev);
      return 0;
}

#else

static int valid_offset (int fd, off64_t offset)
{
      char ch;

      if (lseek64 (fd, offset, 0) < 0)
            return 0;
      if (read (fd, &ch, 1) < 1)
            return 0;
      return 1;
}

/*
 * Returns the number of blocks in a partition
 */
errcode_t ocfs2_get_device_size(const char *file, int blocksize,
                        uint64_t *retblocks)
{
      int   fd, rc = 0;
      int valid_blkgetsize64 = 1;
#ifdef __linux__
      struct            utsname ut;
#endif
      unsigned long long size64;
      unsigned long     size;
      off64_t high, low;
#ifdef FDGETPRM
      struct floppy_struct this_floppy;
#endif
#ifdef HAVE_SYS_DISKLABEL_H
      int part;
      struct disklabel lab;
      struct partition *pp;
      char ch;
#endif /* HAVE_SYS_DISKLABEL_H */

#ifdef HAVE_OPEN64
      fd = open64(file, O_RDONLY);
#else
      fd = open(file, O_RDONLY);
#endif
      if (fd < 0)
            return errno;

#ifdef DKIOCGETBLOCKCOUNT     /* For Apple Darwin */
      if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {
            if ((sizeof(*retblocks) < sizeof(unsigned long long))
                && ((size64 / (blocksize / 512)) > 0xFFFFFFFF))
                  return EFBIG;
            *retblocks = size64 / (blocksize / 512);
            goto out;
      }
#endif

#ifdef BLKGETSIZE64
#ifdef __linux__
      if ((uname(&ut) == 0) &&
          ((ut.release[0] == '2') && (ut.release[1] == '.') &&
           (ut.release[2] < '6') && (ut.release[3] == '.')))
            valid_blkgetsize64 = 0;
#endif
      if (valid_blkgetsize64 &&
          ioctl(fd, BLKGETSIZE64, &size64) >= 0) {
            if ((sizeof(*retblocks) < sizeof(unsigned long long)) &&
                ((size64 / blocksize) > 0xFFFFFFFF)) {
                  rc = EFBIG;
                  goto out;
            }
            *retblocks = size64 / blocksize;
            goto out;
      }
#endif

#ifdef BLKGETSIZE
      if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
            *retblocks = size / (blocksize / 512);
            goto out;
      }
#endif

#ifdef FDGETPRM
      if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
            *retblocks = this_floppy.size / (blocksize / 512);
            goto out;
      }
#endif

#ifdef HAVE_SYS_DISKLABEL_H
#if defined(DIOCGMEDIASIZE)
      {
          off_t ms;
          u_int bs;
          if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
            *retblocks = ms / blocksize;
            goto out;
          }
      }
#elif defined(DIOCGDINFO)
      /* old disklabel interface */
      part = strlen(file) - 1;
      if (part >= 0) {
            ch = file[part];
            if (isdigit(ch))
                  part = 0;
            else if (ch >= 'a' && ch <= 'h')
                  part = ch - 'a';
            else
                  part = -1;
      }
      if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
            pp = &lab.d_partitions[part];
            if (pp->p_size) {
                  *retblocks = pp->p_size / (blocksize / 512);
                  goto out;
            }
      }
#endif /* defined(DIOCG*) */
#endif /* HAVE_SYS_DISKLABEL_H */

      {
#ifdef HAVE_FSTAT64
            struct stat64   st;
            if (fstat64(fd, &st) == 0)
#else
            struct stat st;
            if (fstat(fd, &st) == 0)
#endif
                  if (S_ISREG(st.st_mode)) {
                        *retblocks = st.st_size / blocksize;
                        goto out;
                  }
      }

      /*
       * OK, we couldn't figure it out by using a specialized ioctl,
       * which is generally the best way.  So do binary search to
       * find the size of the partition.
       */
      low = 0;
      for (high = 1024; valid_offset (fd, high); high *= 2)
            low = high;
      while (low < high - 1)
      {
            const off64_t mid = (low + high) / 2;

            if (valid_offset (fd, mid))
                  low = mid;
            else
                  high = mid;
      }
      valid_offset (fd, 0);
      size64 = low + 1;
      if ((sizeof(*retblocks) < sizeof(unsigned long long))
          && ((size64 / blocksize) > 0xFFFFFFFF))
            return EFBIG;
      *retblocks = size64 / blocksize;
out:
      close(fd);
      return rc;
}

#endif /* WIN32 */

#ifdef DEBUG_EXE
#include <inttypes.h>

int main(int argc, char **argv)
{
      uint64_t blocks;
      int    retval;
      
      if (argc < 2) {
            fprintf(stderr, "Usage: %s device\n", argv[0]);
            exit(1);
      }

      retval = ocfs2_get_device_size(argv[1], 1024, &blocks);
      if (retval) {
            com_err(argv[0], retval,
                  "while calling ocfs2_get_device_size");
            exit(1);
      }
      printf("Device %s has %"PRIu64" 1k blocks.\n", argv[1], blocks);
      exit(0);
}
#endif

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