1 files changed, 290 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/getsize.c b/e2fsprogs/ext2fs/getsize.c
new file mode 100644
index 000000000..036d9260c
--- /dev/null
+++ b/e2fsprogs/ext2fs/getsize.c
@@ -0,0 +1,290 @@
+/*
+ * 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%
+ */
+
+#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 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
+
+errcode_t ext2fs_get_device_size(const char *file, int blocksize,
+                                 blk_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, 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_size(const char *file, int blocksize,
+                                 blk_t *retblocks)
+{
+        int     fd;
+        int valid_blkgetsize64 = 1;
+#ifdef __linux__
+        struct          utsname ut;
+#endif
+        unsigned long long size64;
+        unsigned long   size;
+        ext2_loff_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 CONFIG_LFS
+        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;
+                close(fd);
+                *retblocks = size64 / (blocksize / 512);
+                return 0;
+        }
+#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))
+                        return EFBIG;
+                close(fd);
+                *retblocks = size64 / blocksize;
+                return 0;
+        }
+#endif
+
+#ifdef BLKGETSIZE
+        if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
+                close(fd);
+                *retblocks = size / (blocksize / 512);
+                return 0;
+        }
+#endif
+
+#ifdef FDGETPRM
+        if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
+                close(fd);
+                *retblocks = this_floppy.size / (blocksize / 512);
+                return 0;
+        }
+#endif
+
+#ifdef HAVE_SYS_DISKLABEL_H
+#if defined(DIOCGMEDIASIZE)
+        {
+            off_t ms;
+            u_int bs;
+            if (ioctl(fd, DIOCGMEDIASIZE, &ms) >= 0) {
+                *retblocks = ms / blocksize;
+                return 0;
+            }
+        }
+#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) {
+                        close(fd);
+                        *retblocks = pp->p_size / (blocksize / 512);
+                        return 0;
+                }
+        }
+#endif /* defined(DIOCG*) */
+#endif /* HAVE_SYS_DISKLABEL_H */
+
+        /*
+         * 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);
+        close(fd);
+        size64 = low + 1;
+        if ((sizeof(*retblocks) < sizeof(unsigned long long))
+            && ((size64 / blocksize) > 0xFFFFFFFF))
+                return EFBIG;
+        *retblocks = size64 / blocksize;
+        return 0;
+}
+
+#endif /* WIN32 */
+
+#ifdef DEBUG
+int main(int argc, char **argv)
+{
+        blk_t   blocks;
+        int     retval;
+        
+        if (argc < 2) {
+                fprintf(stderr, "Usage: %s device\n", argv[0]);
+                exit(1);
+        }
+
+        retval = ext2fs_get_device_size(argv[1], 1024, &blocks);
+        if (retval) {
+                com_err(argv[0], retval,
+                        "while calling ext2fs_get_device_size");
+                exit(1);
+        }
+        printf("Device %s has %d 1k blocks.\n", argv[1], blocks);
+        exit(0);
+}
+#endif