1 files changed, 324 insertions, 0 deletions
diff --git a/lib/ext2fs/getsize.c b/lib/ext2fs/getsize.c
new file mode 100644
index 0000000..bcf3020
--- /dev/null
+++ b/lib/ext2fs/getsize.c
@@ -0,0 +1,324 @@
+/*
+ * 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 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_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
+#include <sys/disk.h>
+#endif
+#ifdef __linux__
+#include <sys/utsname.h>
+#endif
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#include <ctype.h>
+
+#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 "ext2_fs.h"
+#include "ext2fs.h"
+
+#if defined(__CYGWIN__) || defined (WIN32)
+#include "windows.h"
+#include "winioctl.h"
+
+#if (_WIN32_WINNT >= 0x0500)
+#define HAVE_GET_FILE_SIZE_EX 1
+#endif
+
+HANDLE windows_get_handle(io_channel channel);
+
+errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
+				  blk64_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 */
+
+	io_channel data_io = 0;
+	int retval;
+
+	retval = windows_io_manager->open(file, 0, &data_io);
+	if (retval)
+		return retval;
+
+	dev = windows_get_handle(data_io);
+	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 */
+
+	windows_io_manager->close(data_io);
+
+	return 0;
+}
+
+#else
+
+static int valid_offset (int fd, ext2_loff_t offset)
+{
+	char ch;
+
+	if (ext2fs_llseek (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 ext2fs_get_device_size2(const char *file, int blocksize,
+				  blk64_t *retblocks)
+{
+	int	fd, rc = 0;
+	unsigned long long size64;
+	ext2_loff_t high, low;
+
+	fd = ext2fs_open_file(file, O_RDONLY, 0);
+	if (fd < 0)
+		return errno;
+
+#if defined DKIOCGETBLOCKCOUNT && defined DKIOCGETBLOCKSIZE	/* For Apple Darwin */
+	unsigned int size;
+
+	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0 &&
+	    ioctl(fd, DKIOCGETBLOCKSIZE, &size) >= 0) {
+		*retblocks = size64 * size / blocksize;
+		goto out;
+	}
+#endif
+
+#ifdef BLKGETSIZE64
+	{
+		int valid_blkgetsize64 = 1;
+#ifdef __linux__
+		struct utsname ut;
+
+		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) {
+			*retblocks = size64 / blocksize;
+			goto out;
+		}
+	}
+#endif /* BLKGETSIZE64 */
+
+#ifdef BLKGETSIZE
+	{
+		unsigned long	size;
+
+		if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
+			*retblocks = size / (blocksize / 512);
+			goto out;
+		}
+	}
+#endif
+
+#ifdef FDGETPRM
+	{
+		struct floppy_struct this_floppy;
+
+		if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
+			*retblocks = this_floppy.size / (blocksize / 512);
+			goto out;
+		}
+	}
+#endif
+
+#ifdef HAVE_SYS_DISKLABEL_H
+	{
+		int part;
+		struct disklabel lab;
+		struct partition *pp;
+		char ch;
+
+#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 */
+
+	{
+		ext2fs_struct_stat st;
+
+		if (ext2fs_fstat(fd, &st) == 0)
+			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 ext2_loff_t mid = (low + high) / 2;
+
+		if (valid_offset (fd, mid))
+			low = mid;
+		else
+			high = mid;
+	}
+	valid_offset(fd, 0);
+	size64 = low + 1;
+	*retblocks = size64 / blocksize;
+out:
+	close(fd);
+	return rc;
+}
+
+#endif /* WIN32 */
+
+errcode_t ext2fs_get_device_size(const char *file, int blocksize,
+				 blk_t *retblocks)
+{
+	errcode_t retval;
+	blk64_t	blocks;
+
+	retval = ext2fs_get_device_size2(file, blocksize, &blocks);
+	if (retval)
+		return retval;
+	if (blocks >= (1ULL << 32))
+		return EFBIG;
+	*retblocks = (blk_t) blocks;
+	return 0;
+}
+
+#ifdef DEBUG
+int main(int argc, char **argv)
+{
+	blk64_t	blocks;
+	int	retval;
+
+	if (argc < 2) {
+		fprintf(stderr, "Usage: %s device\n", argv[0]);
+		exit(1);
+	}
+
+	retval = ext2fs_get_device_size2(argv[1], 1024, &blocks);
+	if (retval) {
+		com_err(argv[0], retval,
+			"while calling ext2fs_get_device_size");
+		exit(1);
+	}
+	printf("Device %s has %llu 1k blocks.\n", argv[1],
+	       (unsigned long long) locks);
+	exit(0);
+}
+#endif