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/*
* This file is licensed under the terms of the GNU General Public License,
* version 2. See the file COPYING in the main directory for details.
*
* Copyright (C) 2000-2002 Florian Lohoff <flo@rfc822.org>
* Copyright (C) 2002,2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
*/
#include <ext2fs/ext2_fs.h>
/* ext2fs.h is b0rken, and we don't want to drag everything in. */
#define FILE int
#define _LINUX_TYPES_H
#include <ext2fs/ext2fs.h>
#include <et/com_err.h>
/* Hack! */
#define SIZE_T_DEFINED
#include "delo.h"
#include "stringops.h"
static int partition_start;
static ext2_filsys fs = 0;
static errcode_t delo_ext2_set_blksize(io_channel channel, int blksize);
static errcode_t delo_ext2_open(const char *name, int flags,
io_channel *channel);
static errcode_t delo_ext2_read_blk(io_channel channel, unsigned long block,
int count, void *data);
static errcode_t delo_ext2_close(io_channel channel);
static errcode_t delo_ext2_write_blk(io_channel channel, unsigned long block,
int count, const void *data);
static errcode_t delo_ext2_flush(io_channel channel);
static struct struct_io_manager delo_ext2_io_manager = {
EXT2_ET_MAGIC_IO_MANAGER,
"delo i/o manager",
delo_ext2_open,
delo_ext2_close,
delo_ext2_set_blksize,
delo_ext2_read_blk,
delo_ext2_write_blk,
delo_ext2_flush,
NULL,
{0, }
};
static errcode_t delo_ext2_open(const char *name,
UNUSED int flags,
io_channel *channel)
{
io_channel io;
int retval;
dprintf("delo_ext2_open: called\n");
retval = bootinit(NULL);
dprintf("delo_ext2_open: bootinit returned %d\n", retval);
if (retval)
return EXT2_ET_BAD_DEVICE_NAME;
/* This cant fail :) */
io = (io_channel)malloc(sizeof (struct struct_io_channel));
memset(io, 0, sizeof(struct struct_io_channel));
io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
io->manager = &delo_ext2_io_manager;
io->name = (char *)malloc(strlen(name) + 1);
strcpy(io->name, name);
io->block_size = SECTOR_SIZE;
io->read_error = 0;
io->write_error = 0;
*channel = io;
return 0;
}
static errcode_t delo_ext2_close(UNUSED io_channel channel)
{
dprintf("delo_ext2_close: called\n");
return 0;
}
static errcode_t delo_ext2_set_blksize(io_channel channel, int blksize)
{
channel->block_size = blksize;
dprintf("delo_ext2_set_blksize: called %d\n", blksize);
return 0;
}
static errcode_t delo_ext2_read_blk(io_channel channel, unsigned long block,
int count, void *data)
{
int offset;
/* FIXME: This is our partition start */
offset = block * (channel->block_size / SECTOR_SIZE)
+ partition_start;
/* If it is negative it means bytes -- positive -> blocks */
count = (count < 0) ? -count : count * channel->block_size;
dprintf("delo_ext2_read_blk: called for %d count %d to %p\n",
offset, count, data);
if (bootread(offset, data, count) != count)
return EXT2_ET_SHORT_READ;
return 0;
}
static errcode_t delo_ext2_write_blk(UNUSED io_channel channel,
UNUSED unsigned long block,
UNUSED int count,
UNUSED const void *data)
{
dprintf("delo_ext2_write_blk: called");
return 0;
}
static errcode_t delo_ext2_flush(UNUSED io_channel channel)
{
dprintf("delo_ext2_flush: called");
return 0;
}
static void ext2fs_error(char *funcname, int errcode)
{
com_err(funcname, errcode, NULL);
}
/*
* Get a extent list from an ext2/ext3 filesystem
*/
static blk_t oldblocknr;
static int extent;
static int ext_cnt;
static int ext2_build_extent_list(ext2_filsys fs, blk_t *blocknr,
UNUSED int blockcnt,
UNUSED void *private)
{
if (*blocknr != oldblocknr + 1) {
if (oldblocknr) {
if ((extentlist_add_tail(extent, ext_cnt))) {
extentlist_clear();
return BLOCK_ABORT;
}
}
extent = (*blocknr * (fs->io->block_size / SECTOR_SIZE)
+ partition_start);
ext_cnt = fs->io->block_size / SECTOR_SIZE;
} else
ext_cnt += fs->io->block_size / SECTOR_SIZE;
oldblocknr = *blocknr;
return 0;
}
int readext2blocks(char *partition, char *file)
{
int retval;
ext2_ino_t root = EXT2_ROOT_INO;
ext2_ino_t inode = 0;
char *block_buf;
dprintf("Getting partition info\n");
partition_start = getpartoffset(partition);
if (!partition_start) {
printf("Couldn't find partition %s\n", partition);
return 1;
}
retval = ext2fs_open(partition, 0, 0, 0, &delo_ext2_io_manager, &fs);
if (retval) {
ext2fs_error("extfs_open", retval);
return 1;
}
retval = ext2fs_namei_follow(fs, root, root, file, &inode);
if (retval) {
ext2fs_error("ext2fs_namei_follow", retval);
return 1;
}
/* Build extent list */
extentlist_clear();
block_buf = (char *)malloc(3 * fs->io->block_size);
oldblocknr = 0;
retval = ext2fs_block_iterate(fs, inode, BLOCK_FLAG_DATA_ONLY,
block_buf, ext2_build_extent_list, 0);
if (retval) {
ext2fs_error("ext2fs_block_iterate", retval);
return 1;
}
/* Add last extent */
if (oldblocknr) {
oldblocknr = 0;
if ((extentlist_add_tail(extent, ext_cnt))) {
extentlist_clear();
return 1;
}
}
return 0;
}
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