137 lines
2.4 KiB
C
137 lines
2.4 KiB
C
/*
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* getsectsize.c --- get the sector size of a device.
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*
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* Copyright (C) 1995, 1995 Theodore Ts'o.
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* Copyright (C) 2003 VMware, Inc.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#ifndef _LARGEFILE_SOURCE
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#define _LARGEFILE_SOURCE
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#endif
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#ifndef _LARGEFILE64_SOURCE
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#define _LARGEFILE64_SOURCE
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#endif
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#include "config.h"
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#include <stdio.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <fcntl.h>
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#ifdef HAVE_SYS_DISK_H
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#include <sys/disk.h>
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#endif
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#ifdef HAVE_LINUX_FD_H
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#include <sys/ioctl.h>
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#include <linux/fd.h>
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#endif
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#if defined(__linux__) && defined(_IO)
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#if !defined(BLKSSZGET)
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#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
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#endif
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#if !defined(BLKPBSZGET)
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#define BLKPBSZGET _IO(0x12,123)/* get block physical sector size */
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#endif
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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/*
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* Returns the logical sector size of a device
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*/
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errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize)
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{
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int fd;
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fd = ext2fs_open_file(file, O_RDONLY, 0);
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if (fd < 0)
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return errno;
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#ifdef BLKSSZGET
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if (ioctl(fd, BLKSSZGET, sectsize) >= 0) {
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close(fd);
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return 0;
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}
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#endif
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#ifdef DIOCGSECTORSIZE
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if (ioctl(fd, DIOCGSECTORSIZE, sectsize) >= 0) {
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close(fd);
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return 0;
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}
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#endif
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*sectsize = 0;
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close(fd);
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return 0;
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}
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/*
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* Return desired alignment for direct I/O
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*/
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int ext2fs_get_dio_alignment(int fd)
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{
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int align = 0;
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#ifdef BLKSSZGET
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if (ioctl(fd, BLKSSZGET, &align) < 0)
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align = 0;
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#endif
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#ifdef DIOCGSECTORSIZE
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if (align <= 0 &&
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ioctl(fd, DIOCGSECTORSIZE, &align) < 0)
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align = 0;
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#endif
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#ifdef _SC_PAGESIZE
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if (align <= 0)
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align = sysconf(_SC_PAGESIZE);
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#endif
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#ifdef HAVE_GETPAGESIZE
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if (align <= 0)
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align = getpagesize();
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#endif
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if (align <= 0)
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align = 4096;
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return align;
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}
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/*
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* Returns the physical sector size of a device
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*/
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errcode_t ext2fs_get_device_phys_sectsize(const char *file, int *sectsize)
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{
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int fd;
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fd = ext2fs_open_file(file, O_RDONLY, 0);
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if (fd < 0)
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return errno;
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#ifdef BLKPBSZGET
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if (ioctl(fd, BLKPBSZGET, sectsize) >= 0) {
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close(fd);
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return 0;
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}
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#endif
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#ifdef DIOCGSECTORSIZE
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/* This isn't really the physical sector size, but FreeBSD
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* doesn't seem to have this concept. */
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if (ioctl(fd, DIOCGSECTORSIZE, sectsize) >= 0) {
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close(fd);
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return 0;
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}
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#endif
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*sectsize = 0;
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close(fd);
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return 0;
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}
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