a0f136e1c5
Use this for VHD and VMDK to avoid allocating space in the image for empty sectors. Note that this negatively affects performance because mkimg uses a temporary file for the intermediate storage. When mkimg has better internal book keeping, performance can be significantly improved.
231 lines
4.7 KiB
C
231 lines
4.7 KiB
C
/*-
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* Copyright (c) 2014 Juniper Networks, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "image.h"
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#include "mkimg.h"
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#define BUFFER_SIZE (1024*1024)
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static char image_tmpfile[PATH_MAX];
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static int image_fd = -1;
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static lba_t image_size;
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static void
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cleanup(void)
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{
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if (image_fd != -1)
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close(image_fd);
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unlink(image_tmpfile);
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}
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int
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image_copyin(lba_t blk, int fd, uint64_t *sizep)
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{
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char *buffer;
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uint64_t bytesize;
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ssize_t bcnt, rdsz;
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int error, partial;
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assert(BUFFER_SIZE % secsz == 0);
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buffer = malloc(BUFFER_SIZE);
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if (buffer == NULL)
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return (ENOMEM);
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bytesize = 0;
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partial = 0;
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while (1) {
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rdsz = read(fd, buffer, BUFFER_SIZE);
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if (rdsz <= 0) {
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error = (rdsz < 0) ? errno : 0;
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break;
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}
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if (partial)
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abort();
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bytesize += rdsz;
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bcnt = (rdsz + secsz - 1) / secsz;
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error = image_write(blk, buffer, bcnt);
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if (error)
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break;
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blk += bcnt;
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partial = ((ssize_t)(bcnt * secsz) != rdsz) ? 1 : 0;
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}
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free(buffer);
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if (sizep != NULL)
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*sizep = bytesize;
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return (error);
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}
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int
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image_copyout(int fd)
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{
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int error;
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error = image_copyout_region(fd, 0, image_size);
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if (!error)
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error = image_copyout_done(fd);
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return (error);
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}
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int
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image_copyout_done(int fd)
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{
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off_t ofs;
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int error;
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ofs = lseek(fd, 0L, SEEK_CUR);
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if (ofs == -1)
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return (0);
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error = (ftruncate(fd, ofs) == -1) ? errno : 0;
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return (error);
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}
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int
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image_copyout_region(int fd, lba_t blk, lba_t size)
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{
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char *buffer;
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off_t ofs;
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size_t sz;
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ssize_t rdsz, wrsz;
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int error;
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ofs = lseek(fd, 0L, SEEK_CUR);
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blk *= secsz;
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if (lseek(image_fd, blk, SEEK_SET) != blk)
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return (errno);
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buffer = malloc(BUFFER_SIZE);
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if (buffer == NULL)
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return (errno);
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error = 0;
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size *= secsz;
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while (size > 0) {
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sz = (BUFFER_SIZE < size) ? BUFFER_SIZE : size;
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rdsz = read(image_fd, buffer, sz);
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if (rdsz <= 0) {
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error = (rdsz < 0) ? errno : 0;
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break;
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}
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wrsz = (ofs == -1) ?
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write(fd, buffer, rdsz) :
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sparse_write(fd, buffer, rdsz);
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if (wrsz < 0) {
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error = errno;
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break;
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}
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assert(wrsz == rdsz);
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size -= rdsz;
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}
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free(buffer);
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return (error);
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}
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int
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image_data(lba_t blk, lba_t size)
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{
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char *buffer, *p;
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blk *= secsz;
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if (lseek(image_fd, blk, SEEK_SET) != blk)
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return (1);
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size *= secsz;
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buffer = malloc(size);
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if (buffer == NULL)
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return (1);
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if (read(image_fd, buffer, size) != (ssize_t)size) {
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free(buffer);
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return (1);
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}
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p = buffer;
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while (size > 0 && *p == '\0')
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size--, p++;
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free(buffer);
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return ((size == 0) ? 0 : 1);
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}
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lba_t
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image_get_size(void)
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{
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return (image_size);
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}
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int
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image_set_size(lba_t blk)
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{
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image_size = blk;
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if (ftruncate(image_fd, blk * secsz) == -1)
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return (errno);
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return (0);
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}
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int
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image_write(lba_t blk, void *buf, ssize_t len)
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{
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blk *= secsz;
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if (lseek(image_fd, blk, SEEK_SET) != blk)
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return (errno);
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len *= secsz;
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if (sparse_write(image_fd, buf, len) != len)
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return (errno);
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return (0);
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}
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int
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image_init(void)
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{
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const char *tmpdir;
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if (atexit(cleanup) == -1)
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return (errno);
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if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
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tmpdir = _PATH_TMP;
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snprintf(image_tmpfile, sizeof(image_tmpfile), "%s/mkimg-XXXXXX",
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tmpdir);
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image_fd = mkstemp(image_tmpfile);
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if (image_fd == -1)
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return (errno);
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return (0);
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}
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