summaryrefslogtreecommitdiffhomepage
path: root/e2fsprogs/ext2fs/imager.c
diff options
context:
space:
mode:
Diffstat (limited to 'e2fsprogs/ext2fs/imager.c')
-rw-r--r--e2fsprogs/ext2fs/imager.c377
1 files changed, 0 insertions, 377 deletions
diff --git a/e2fsprogs/ext2fs/imager.c b/e2fsprogs/ext2fs/imager.c
deleted file mode 100644
index e82321efa..000000000
--- a/e2fsprogs/ext2fs/imager.c
+++ /dev/null
@@ -1,377 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * image.c --- writes out the critical parts of the filesystem as a
- * flat file.
- *
- * Copyright (C) 2000 Theodore Ts'o.
- *
- * Note: this uses the POSIX IO interfaces, unlike most of the other
- * functions in this library. So sue me.
- *
- * %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
- * %End-Header%
- */
-
-#include <stdio.h>
-#include <string.h>
-#if HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#if HAVE_ERRNO_H
-#include <errno.h>
-#endif
-#include <fcntl.h>
-#include <time.h>
-#if HAVE_SYS_STAT_H
-#include <sys/stat.h>
-#endif
-#if HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-
-#include "ext2_fs.h"
-#include "ext2fs.h"
-
-#ifndef HAVE_TYPE_SSIZE_T
-typedef int ssize_t;
-#endif
-
-/*
- * This function returns 1 if the specified block is all zeros
- */
-static int check_zero_block(char *buf, int blocksize)
-{
- char *cp = buf;
- int left = blocksize;
-
- while (left > 0) {
- if (*cp++)
- return 0;
- left--;
- }
- return 1;
-}
-
-/*
- * Write the inode table out as a single block.
- */
-#define BUF_BLOCKS 32
-
-errcode_t ext2fs_image_inode_write(ext2_filsys fs, int fd, int flags)
-{
- unsigned int group, left, c, d;
- char *buf, *cp;
- blk_t blk;
- ssize_t actual;
- errcode_t retval;
-
- buf = xmalloc(fs->blocksize * BUF_BLOCKS);
-
- for (group = 0; group < fs->group_desc_count; group++) {
- blk = fs->group_desc[(unsigned)group].bg_inode_table;
- if (!blk)
- return EXT2_ET_MISSING_INODE_TABLE;
- left = fs->inode_blocks_per_group;
- while (left) {
- c = BUF_BLOCKS;
- if (c > left)
- c = left;
- retval = io_channel_read_blk(fs->io, blk, c, buf);
- if (retval)
- goto errout;
- cp = buf;
- while (c) {
- if (!(flags & IMAGER_FLAG_SPARSEWRITE)) {
- d = c;
- goto skip_sparse;
- }
- /* Skip zero blocks */
- if (check_zero_block(cp, fs->blocksize)) {
- c--;
- blk++;
- left--;
- cp += fs->blocksize;
- lseek(fd, fs->blocksize, SEEK_CUR);
- continue;
- }
- /* Find non-zero blocks */
- for (d=1; d < c; d++) {
- if (check_zero_block(cp + d*fs->blocksize, fs->blocksize))
- break;
- }
- skip_sparse:
- actual = write(fd, cp, fs->blocksize * d);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != (ssize_t) (fs->blocksize * d)) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
- blk += d;
- left -= d;
- cp += fs->blocksize * d;
- c -= d;
- }
- }
- }
- retval = 0;
-
-errout:
- free(buf);
- return retval;
-}
-
-/*
- * Read in the inode table and stuff it into place
- */
-errcode_t ext2fs_image_inode_read(ext2_filsys fs, int fd,
- int flags EXT2FS_ATTR((unused)))
-{
- unsigned int group, c, left;
- char *buf;
- blk_t blk;
- ssize_t actual;
- errcode_t retval;
-
- buf = xmalloc(fs->blocksize * BUF_BLOCKS);
-
- for (group = 0; group < fs->group_desc_count; group++) {
- blk = fs->group_desc[(unsigned)group].bg_inode_table;
- if (!blk) {
- retval = EXT2_ET_MISSING_INODE_TABLE;
- goto errout;
- }
- left = fs->inode_blocks_per_group;
- while (left) {
- c = BUF_BLOCKS;
- if (c > left)
- c = left;
- actual = read(fd, buf, fs->blocksize * c);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != (ssize_t) (fs->blocksize * c)) {
- retval = EXT2_ET_SHORT_READ;
- goto errout;
- }
- retval = io_channel_write_blk(fs->io, blk, c, buf);
- if (retval)
- goto errout;
-
- blk += c;
- left -= c;
- }
- }
- retval = ext2fs_flush_icache(fs);
-
-errout:
- free(buf);
- return retval;
-}
-
-/*
- * Write out superblock and group descriptors
- */
-errcode_t ext2fs_image_super_write(ext2_filsys fs, int fd,
- int flags EXT2FS_ATTR((unused)))
-{
- char *buf, *cp;
- ssize_t actual;
- errcode_t retval;
-
- buf = xmalloc(fs->blocksize);
-
- /*
- * Write out the superblock
- */
- memset(buf, 0, fs->blocksize);
- memcpy(buf, fs->super, SUPERBLOCK_SIZE);
- actual = write(fd, buf, fs->blocksize);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != (ssize_t) fs->blocksize) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
-
- /*
- * Now write out the block group descriptors
- */
- cp = (char *) fs->group_desc;
- actual = write(fd, cp, fs->blocksize * fs->desc_blocks);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != (ssize_t) (fs->blocksize * fs->desc_blocks)) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
-
- retval = 0;
-
-errout:
- free(buf);
- return retval;
-}
-
-/*
- * Read the superblock and group descriptors and overwrite them.
- */
-errcode_t ext2fs_image_super_read(ext2_filsys fs, int fd,
- int flags EXT2FS_ATTR((unused)))
-{
- char *buf;
- ssize_t actual, size;
- errcode_t retval;
-
- size = fs->blocksize * (fs->group_desc_count + 1);
- buf = xmalloc(size);
-
- /*
- * Read it all in.
- */
- actual = read(fd, buf, size);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != size) {
- retval = EXT2_ET_SHORT_READ;
- goto errout;
- }
-
- /*
- * Now copy in the superblock and group descriptors
- */
- memcpy(fs->super, buf, SUPERBLOCK_SIZE);
-
- memcpy(fs->group_desc, buf + fs->blocksize,
- fs->blocksize * fs->group_desc_count);
-
- retval = 0;
-
-errout:
- free(buf);
- return retval;
-}
-
-/*
- * Write the block/inode bitmaps.
- */
-errcode_t ext2fs_image_bitmap_write(ext2_filsys fs, int fd, int flags)
-{
- char *ptr;
- int c, size;
- char zero_buf[1024];
- ssize_t actual;
- errcode_t retval;
-
- if (flags & IMAGER_FLAG_INODEMAP) {
- if (!fs->inode_map) {
- retval = ext2fs_read_inode_bitmap(fs);
- if (retval)
- return retval;
- }
- ptr = fs->inode_map->bitmap;
- size = (EXT2_INODES_PER_GROUP(fs->super) / 8);
- } else {
- if (!fs->block_map) {
- retval = ext2fs_read_block_bitmap(fs);
- if (retval)
- return retval;
- }
- ptr = fs->block_map->bitmap;
- size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
- }
- size = size * fs->group_desc_count;
-
- actual = write(fd, ptr, size);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != size) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
- size = size % fs->blocksize;
- memset(zero_buf, 0, sizeof(zero_buf));
- if (size) {
- size = fs->blocksize - size;
- while (size) {
- c = size;
- if (c > (int) sizeof(zero_buf))
- c = sizeof(zero_buf);
- actual = write(fd, zero_buf, c);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != c) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
- size -= c;
- }
- }
- retval = 0;
-errout:
- return retval;
-}
-
-
-/*
- * Read the block/inode bitmaps.
- */
-errcode_t ext2fs_image_bitmap_read(ext2_filsys fs, int fd, int flags)
-{
- char *ptr, *buf = 0;
- int size;
- ssize_t actual;
- errcode_t retval;
-
- if (flags & IMAGER_FLAG_INODEMAP) {
- if (!fs->inode_map) {
- retval = ext2fs_read_inode_bitmap(fs);
- if (retval)
- return retval;
- }
- ptr = fs->inode_map->bitmap;
- size = (EXT2_INODES_PER_GROUP(fs->super) / 8);
- } else {
- if (!fs->block_map) {
- retval = ext2fs_read_block_bitmap(fs);
- if (retval)
- return retval;
- }
- ptr = fs->block_map->bitmap;
- size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
- }
- size = size * fs->group_desc_count;
-
- buf = xmalloc(size);
-
- actual = read(fd, buf, size);
- if (actual == -1) {
- retval = errno;
- goto errout;
- }
- if (actual != size) {
- retval = EXT2_ET_SHORT_WRITE;
- goto errout;
- }
- memcpy(ptr, buf, size);
-
- retval = 0;
-errout:
- free(buf);
- return retval;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 04:29:55 +0000