/*

 * getsectsize.c --- get the sector size of a device.

 *

 * Copyright (C) 1995, 1995 Theodore Ts'o.

 * Copyright (C) 2003 VMware, Inc.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Library

 * General Public License, version 2.

 * %End-Header%

 */

#ifndef _LARGEFILE_SOURCE

#define _LARGEFILE_SOURCE

#endif

#ifndef _LARGEFILE64_SOURCE

#define _LARGEFILE64_SOURCE

#endif

#include "config.h"

#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_DISK_H

#include <sys/disk.h>

#endif

#ifdef HAVE_LINUX_FD_H

#include <sys/ioctl.h>

#include <linux/fd.h>

#endif

#if defined(__linux__) && defined(_IO)

#if !defined(BLKSSZGET)

#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */

#endif

#if !defined(BLKPBSZGET)

#define BLKPBSZGET _IO(0x12,123)/* get block physical sector size */

#endif

#endif

#include "ext2_fs.h"

#include "ext2fs.h"

/*

 * Returns the logical sector size of a device

 */

errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize)

{

#ifdef _WIN32

  *sectsize = 512; // just guessing

  return 0;

#else // not _WIN32

  int fd;

  fd = ext2fs_open_file(file, O_RDONLY, 0);

  if (fd < 0)

    return errno;

#ifdef BLKSSZGET

  if (ioctl(fd, BLKSSZGET, sectsize) >= 0) {

    close(fd);

    return 0;

  }

#endif

#ifdef DIOCGSECTORSIZE

  if (ioctl(fd, DIOCGSECTORSIZE, sectsize) >= 0) {

    close(fd);

    return 0;

  }

#endif

  *sectsize = 0;

  close(fd);

  return 0;

#endif // ifdef _WIN32

}

/*

 * Return desired alignment for direct I/O

 */

int ext2fs_get_dio_alignment(int fd)

{

  int align = 0;

#ifdef BLKSSZGET

  if (ioctl(fd, BLKSSZGET, &align) < 0)

    align = 0;

#endif

#ifdef DIOCGSECTORSIZE

  if (align <= 0 &&

      ioctl(fd, DIOCGSECTORSIZE, &align) < 0)

    align = 0;

#endif

#ifdef _SC_PAGESIZE

  if (align <= 0)

    align = sysconf(_SC_PAGESIZE);

#endif

#ifdef HAVE_GETPAGESIZE

  if (align <= 0)

    align = getpagesize();

#endif

  if (align <= 0)

    align = 4096;

  return align;

}

/*

 * Returns the physical sector size of a device

 */

errcode_t ext2fs_get_device_phys_sectsize(const char *file, int *sectsize)

{

#ifdef _WIN32

  return ext2fs_get_device_sectsize(file, sectsize);

#else // not _WIN32

  int fd;

  fd = ext2fs_open_file(file, O_RDONLY, 0);

  if (fd < 0)

    return errno;

#ifdef BLKPBSZGET

  if (ioctl(fd, BLKPBSZGET, sectsize) >= 0) {

    close(fd);

    return 0;

  }

#endif

#ifdef DIOCGSECTORSIZE

  /* This isn't really the physical sector size, but FreeBSD

   * doesn't seem to have this concept. */

  if (ioctl(fd, DIOCGSECTORSIZE, sectsize) >= 0) {

    close(fd);

    return 0;

  }

#endif

  *sectsize = 0;

  close(fd);

  return 0;

#endif // ifdef _WIN32

}