375 lines
7.2 KiB
C
375 lines
7.2 KiB
C
/*
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* No copyright is claimed. This code is in the public domain; do with
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* it what you wish.
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*
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* Written by Karel Zak <kzak@redhat.com>
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <stdint.h>
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#ifdef HAVE_LINUX_FD_H
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#include <linux/fd.h>
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#endif
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#ifdef HAVE_SYS_DISKLABEL_H
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#include <sys/disklabel.h>
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#endif
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#ifdef HAVE_SYS_DISK_H
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#ifdef HAVE_SYS_QUEUE_H
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#include <sys/queue.h> /* for LIST_HEAD */
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#endif
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#include <sys/disk.h>
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#endif
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#include "blkdev.h"
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#include "c.h"
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#include "linux_version.h"
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static long
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blkdev_valid_offset (int fd, off_t offset) {
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char ch;
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if (lseek (fd, offset, 0) < 0)
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return 0;
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if (read (fd, &ch, 1) < 1)
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return 0;
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return 1;
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}
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int is_blkdev(int fd)
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{
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struct stat st;
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return (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode));
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}
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off_t
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blkdev_find_size (int fd) {
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uintmax_t high, low = 0;
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for (high = 1024; blkdev_valid_offset (fd, high); ) {
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if (high == UINTMAX_MAX)
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return -1;
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low = high;
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if (high >= UINTMAX_MAX/2)
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high = UINTMAX_MAX;
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else
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high *= 2;
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}
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while (low < high - 1)
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{
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uintmax_t mid = (low + high) / 2;
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if (blkdev_valid_offset (fd, mid))
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low = mid;
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else
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high = mid;
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}
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blkdev_valid_offset (fd, 0);
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return (low + 1);
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}
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/* get size in bytes */
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int
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blkdev_get_size(int fd, unsigned long long *bytes)
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{
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#ifdef DKIOCGETBLOCKCOUNT
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/* Apple Darwin */
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if (ioctl(fd, DKIOCGETBLOCKCOUNT, bytes) >= 0) {
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*bytes <<= 9;
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return 0;
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}
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#endif
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#ifdef BLKGETSIZE64
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{
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#ifdef __linux__
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int ver = get_linux_version();
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/* kernels 2.4.15-2.4.17, had a broken BLKGETSIZE64 */
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if (ver >= KERNEL_VERSION (2,6,0) ||
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(ver >= KERNEL_VERSION (2,4,18) && ver < KERNEL_VERSION (2,5,0)))
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#endif
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if (ioctl(fd, BLKGETSIZE64, bytes) >= 0)
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return 0;
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}
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#endif /* BLKGETSIZE64 */
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#ifdef BLKGETSIZE
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{
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unsigned long size;
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if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
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*bytes = ((unsigned long long)size << 9);
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return 0;
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}
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}
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#endif /* BLKGETSIZE */
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#ifdef DIOCGMEDIASIZE
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/* FreeBSD */
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if (ioctl(fd, DIOCGMEDIASIZE, bytes) >= 0)
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return 0;
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#endif
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#ifdef FDGETPRM
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{
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struct floppy_struct this_floppy;
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if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
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*bytes = this_floppy.size << 9;
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return 0;
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}
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}
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#endif /* FDGETPRM */
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#ifdef HAVE_SYS_DISKLABEL_H
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{
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/*
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* This code works for FreeBSD 4.11 i386, except for the full device
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* (such as /dev/ad0). It doesn't work properly for newer FreeBSD
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* though. FreeBSD >= 5.0 should be covered by the DIOCGMEDIASIZE
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* above however.
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*
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* Note that FreeBSD >= 4.0 has disk devices as unbuffered (raw,
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* character) devices, so we need to check for S_ISCHR, too.
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*/
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int part = -1;
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struct disklabel lab;
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struct partition *pp;
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char ch;
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struct stat st;
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if ((fstat(fd, &st) >= 0) &&
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(S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)))
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part = st.st_rdev & 7;
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if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
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pp = &lab.d_partitions[part];
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if (pp->p_size) {
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*bytes = pp->p_size << 9;
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return 0;
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}
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}
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}
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#endif /* HAVE_SYS_DISKLABEL_H */
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{
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struct stat st;
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if (fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
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*bytes = st.st_size;
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return 0;
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}
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if (!S_ISBLK(st.st_mode))
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return -1;
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}
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*bytes = blkdev_find_size(fd);
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return 0;
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}
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/* get 512-byte sector count */
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int
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blkdev_get_sectors(int fd, unsigned long long *sectors)
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{
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unsigned long long bytes;
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if (blkdev_get_size(fd, &bytes) == 0) {
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*sectors = (bytes >> 9);
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return 0;
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}
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return -1;
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}
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/*
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* Get logical sector size.
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*
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* This is the smallest unit the storage device can
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* address. It is typically 512 bytes.
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*/
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int blkdev_get_sector_size(int fd, int *sector_size)
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{
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#ifdef BLKSSZGET
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if (ioctl(fd, BLKSSZGET, sector_size) >= 0)
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return 0;
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return -1;
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#else
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*sector_size = DEFAULT_SECTOR_SIZE;
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return 0;
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#endif
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}
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/*
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* Get physical block device size. The BLKPBSZGET is supported since Linux
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* 2.6.32. For old kernels is probably the best to assume that physical sector
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* size is the same as logical sector size.
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*
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* Example:
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*
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* rc = blkdev_get_physector_size(fd, &physec);
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* if (rc || physec == 0) {
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* rc = blkdev_get_sector_size(fd, &physec);
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* if (rc)
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* physec = DEFAULT_SECTOR_SIZE;
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* }
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*/
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int blkdev_get_physector_size(int fd, int *sector_size)
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{
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#ifdef BLKPBSZGET
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if (ioctl(fd, BLKPBSZGET, §or_size) >= 0)
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return 0;
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return -1;
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#else
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*sector_size = DEFAULT_SECTOR_SIZE;
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return 0;
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#endif
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}
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/*
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* Return the alignment status of a device
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*/
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int blkdev_is_misaligned(int fd)
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{
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#ifdef BLKALIGNOFF
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int aligned;
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if (ioctl(fd, BLKALIGNOFF, &aligned) < 0)
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return 0; /* probably kernel < 2.6.32 */
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/*
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* Note that kernel returns -1 as alignement offset if no compatible
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* sizes and alignments exist for stacked devices
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*/
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return aligned != 0 ? 1 : 0;
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#else
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return 0;
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#endif
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}
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int blkdev_is_cdrom(int fd)
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{
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#ifdef CDROM_GET_CAPABILITY
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int ret;
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if ((ret = ioctl(fd, CDROM_GET_CAPABILITY, NULL)) < 0)
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return 0;
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else
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return ret;
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#else
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return 0;
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#endif
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}
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/*
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* Get kernel's interpretation of the device's geometry.
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*
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* Returns the heads and sectors - but not cylinders
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* as it's truncated for disks with more than 65535 tracks.
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*
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* Note that this is deprecated in favor of LBA addressing.
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*/
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int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s)
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{
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#ifdef HDIO_GETGEO
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struct hd_geometry geometry;
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if (ioctl(fd, HDIO_GETGEO, &geometry) == 0) {
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*h = geometry.heads;
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*s = geometry.sectors;
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return 0;
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}
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#else
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*h = 0;
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*s = 0;
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#endif
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return -1;
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}
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/*
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* Convert scsi type to human readable string.
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*/
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const char *blkdev_scsi_type_to_name(int type)
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{
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switch (type) {
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case SCSI_TYPE_DISK:
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return "disk";
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case SCSI_TYPE_TAPE:
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return "tape";
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case SCSI_TYPE_PRINTER:
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return "printer";
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case SCSI_TYPE_PROCESSOR:
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return "processor";
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case SCSI_TYPE_WORM:
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return "worm";
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case SCSI_TYPE_ROM:
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return "rom";
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case SCSI_TYPE_SCANNER:
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return "scanner";
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case SCSI_TYPE_MOD:
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return "mo-disk";
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case SCSI_TYPE_MEDIUM_CHANGER:
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return "changer";
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case SCSI_TYPE_COMM:
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return "comm";
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case SCSI_TYPE_RAID:
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return "raid";
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case SCSI_TYPE_ENCLOSURE:
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return "enclosure";
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case SCSI_TYPE_RBC:
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return "rbc";
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case SCSI_TYPE_OSD:
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return "osd";
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case SCSI_TYPE_NO_LUN:
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return "no-lun";
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default:
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break;
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}
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return NULL;
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}
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#ifdef TEST_PROGRAM_BLKDEV
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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int
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main(int argc, char **argv)
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{
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unsigned long long bytes;
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unsigned long long sectors;
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int sector_size, phy_sector_size;
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int fd;
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if (argc != 2) {
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fprintf(stderr, "usage: %s device\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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if ((fd = open(argv[1], O_RDONLY|O_CLOEXEC)) < 0)
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err(EXIT_FAILURE, "open %s failed", argv[1]);
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if (blkdev_get_size(fd, &bytes) < 0)
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err(EXIT_FAILURE, "blkdev_get_size() failed");
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if (blkdev_get_sectors(fd, §ors) < 0)
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err(EXIT_FAILURE, "blkdev_get_sectors() failed");
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if (blkdev_get_sector_size(fd, §or_size) < 0)
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err(EXIT_FAILURE, "blkdev_get_sector_size() failed");
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if (blkdev_get_physector_size(fd, &phy_sector_size) < 0)
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err(EXIT_FAILURE, "blkdev_get_physector_size() failed");
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printf(" bytes: %llu\n", bytes);
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printf(" sectors: %llu\n", sectors);
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printf(" sector size: %d\n", sector_size);
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printf("phy-sector size: %d\n", phy_sector_size);
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return EXIT_SUCCESS;
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}
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#endif /* TEST_PROGRAM */
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