mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-11-28 06:04:16 +01:00
30bc03c9fa
-updated libext2fs to e2fsprogs 1.42 -updated libfat to R4883 Thanks to USB Loader GX for the new libs
293 lines
7.2 KiB
C
293 lines
7.2 KiB
C
/*
|
|
* inode_io.c --- This is allows an inode in an ext2 filesystem image
|
|
* to be accessed via the I/O manager interface.
|
|
*
|
|
* Copyright (C) 2002 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Library
|
|
* General Public License, version 2.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#if HAVE_ERRNO_H
|
|
#include <errno.h>
|
|
#endif
|
|
#include <time.h>
|
|
|
|
#include "ext2_fs.h"
|
|
#include "ext2fs.h"
|
|
|
|
/*
|
|
* For checking structure magic numbers...
|
|
*/
|
|
|
|
#define EXT2_CHECK_MAGIC(struct, code) \
|
|
if ((struct)->magic != (code)) return (code)
|
|
|
|
struct inode_private_data {
|
|
int magic;
|
|
char name[32];
|
|
ext2_file_t file;
|
|
ext2_filsys fs;
|
|
ext2_ino_t ino;
|
|
struct ext2_inode inode;
|
|
int flags;
|
|
struct inode_private_data *next;
|
|
};
|
|
|
|
#define CHANNEL_HAS_INODE 0x8000
|
|
|
|
static struct inode_private_data *top_intern;
|
|
static int ino_unique = 0;
|
|
|
|
static errcode_t inode_open(const char *name, int flags, io_channel *channel);
|
|
static errcode_t inode_close(io_channel channel);
|
|
static errcode_t inode_set_blksize(io_channel channel, int blksize);
|
|
static errcode_t inode_read_blk(io_channel channel, unsigned long block,
|
|
int count, void *data);
|
|
static errcode_t inode_write_blk(io_channel channel, unsigned long block,
|
|
int count, const void *data);
|
|
static errcode_t inode_flush(io_channel channel);
|
|
static errcode_t inode_write_byte(io_channel channel, unsigned long offset,
|
|
int size, const void *data);
|
|
static errcode_t inode_read_blk64(io_channel channel,
|
|
unsigned long long block, int count, void *data);
|
|
static errcode_t inode_write_blk64(io_channel channel,
|
|
unsigned long long block, int count, const void *data);
|
|
|
|
static struct struct_io_manager struct_inode_manager = {
|
|
EXT2_ET_MAGIC_IO_MANAGER,
|
|
"Inode I/O Manager",
|
|
inode_open,
|
|
inode_close,
|
|
inode_set_blksize,
|
|
inode_read_blk,
|
|
inode_write_blk,
|
|
inode_flush,
|
|
inode_write_byte,
|
|
NULL,
|
|
NULL,
|
|
inode_read_blk64,
|
|
inode_write_blk64
|
|
};
|
|
|
|
io_manager inode_io_manager = &struct_inode_manager;
|
|
|
|
errcode_t ext2fs_inode_io_intern2(ext2_filsys fs, ext2_ino_t ino,
|
|
struct ext2_inode *inode,
|
|
char **name)
|
|
{
|
|
struct inode_private_data *data;
|
|
errcode_t retval;
|
|
|
|
if ((retval = ext2fs_get_mem(sizeof(struct inode_private_data),
|
|
&data)))
|
|
return retval;
|
|
data->magic = EXT2_ET_MAGIC_INODE_IO_CHANNEL;
|
|
sprintf(data->name, "%u:%d", ino, ino_unique++);
|
|
data->file = 0;
|
|
data->fs = fs;
|
|
data->ino = ino;
|
|
data->flags = 0;
|
|
if (inode) {
|
|
memcpy(&data->inode, inode, sizeof(struct ext2_inode));
|
|
data->flags |= CHANNEL_HAS_INODE;
|
|
}
|
|
data->next = top_intern;
|
|
top_intern = data;
|
|
*name = data->name;
|
|
return 0;
|
|
}
|
|
|
|
errcode_t ext2fs_inode_io_intern(ext2_filsys fs, ext2_ino_t ino,
|
|
char **name)
|
|
{
|
|
return ext2fs_inode_io_intern2(fs, ino, NULL, name);
|
|
}
|
|
|
|
|
|
static errcode_t inode_open(const char *name, int flags, io_channel *channel)
|
|
{
|
|
io_channel io = NULL;
|
|
struct inode_private_data *prev, *data = NULL;
|
|
errcode_t retval;
|
|
int open_flags;
|
|
|
|
if (name == 0)
|
|
return EXT2_ET_BAD_DEVICE_NAME;
|
|
|
|
for (data = top_intern, prev = NULL; data;
|
|
prev = data, data = data->next)
|
|
if (strcmp(name, data->name) == 0)
|
|
break;
|
|
if (!data)
|
|
return ENOENT;
|
|
if (prev)
|
|
prev->next = data->next;
|
|
else
|
|
top_intern = data->next;
|
|
|
|
retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
|
|
if (retval)
|
|
goto cleanup;
|
|
memset(io, 0, sizeof(struct struct_io_channel));
|
|
|
|
io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
|
|
io->manager = inode_io_manager;
|
|
retval = ext2fs_get_mem(strlen(name)+1, &io->name);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
strcpy(io->name, name);
|
|
io->private_data = data;
|
|
io->block_size = 1024;
|
|
io->read_error = 0;
|
|
io->write_error = 0;
|
|
io->refcount = 1;
|
|
|
|
open_flags = (flags & IO_FLAG_RW) ? EXT2_FILE_WRITE : 0;
|
|
retval = ext2fs_file_open2(data->fs, data->ino,
|
|
(data->flags & CHANNEL_HAS_INODE) ?
|
|
&data->inode : 0, open_flags,
|
|
&data->file);
|
|
if (retval)
|
|
goto cleanup;
|
|
|
|
*channel = io;
|
|
return 0;
|
|
|
|
cleanup:
|
|
if (io && io->name)
|
|
ext2fs_free_mem(&io->name);
|
|
if (data)
|
|
ext2fs_free_mem(&data);
|
|
if (io)
|
|
ext2fs_free_mem(&io);
|
|
return retval;
|
|
}
|
|
|
|
static errcode_t inode_close(io_channel channel)
|
|
{
|
|
struct inode_private_data *data;
|
|
errcode_t retval = 0;
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
data = (struct inode_private_data *) channel->private_data;
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL);
|
|
|
|
if (--channel->refcount > 0)
|
|
return 0;
|
|
|
|
retval = ext2fs_file_close(data->file);
|
|
|
|
ext2fs_free_mem(&channel->private_data);
|
|
if (channel->name)
|
|
ext2fs_free_mem(&channel->name);
|
|
ext2fs_free_mem(&channel);
|
|
return retval;
|
|
}
|
|
|
|
static errcode_t inode_set_blksize(io_channel channel, int blksize)
|
|
{
|
|
struct inode_private_data *data;
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
data = (struct inode_private_data *) channel->private_data;
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL);
|
|
|
|
channel->block_size = blksize;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static errcode_t inode_read_blk64(io_channel channel,
|
|
unsigned long long block, int count, void *buf)
|
|
{
|
|
struct inode_private_data *data;
|
|
errcode_t retval;
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
data = (struct inode_private_data *) channel->private_data;
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL);
|
|
|
|
if ((retval = ext2fs_file_lseek(data->file,
|
|
block * channel->block_size,
|
|
EXT2_SEEK_SET, 0)))
|
|
return retval;
|
|
|
|
count = (count < 0) ? -count : (count * channel->block_size);
|
|
|
|
return ext2fs_file_read(data->file, buf, count, 0);
|
|
}
|
|
|
|
static errcode_t inode_read_blk(io_channel channel, unsigned long block,
|
|
int count, void *buf)
|
|
{
|
|
return inode_read_blk64(channel, block, count, buf);
|
|
}
|
|
|
|
static errcode_t inode_write_blk64(io_channel channel,
|
|
unsigned long long block, int count, const void *buf)
|
|
{
|
|
struct inode_private_data *data;
|
|
errcode_t retval;
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
data = (struct inode_private_data *) channel->private_data;
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL);
|
|
|
|
if ((retval = ext2fs_file_lseek(data->file,
|
|
block * channel->block_size,
|
|
EXT2_SEEK_SET, 0)))
|
|
return retval;
|
|
|
|
count = (count < 0) ? -count : (count * channel->block_size);
|
|
|
|
return ext2fs_file_write(data->file, buf, count, 0);
|
|
}
|
|
|
|
static errcode_t inode_write_blk(io_channel channel, unsigned long block,
|
|
int count, const void *buf)
|
|
{
|
|
return inode_write_blk64(channel, block, count, buf);
|
|
}
|
|
|
|
static errcode_t inode_write_byte(io_channel channel, unsigned long offset,
|
|
int size, const void *buf)
|
|
{
|
|
struct inode_private_data *data;
|
|
errcode_t retval = 0;
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
data = (struct inode_private_data *) channel->private_data;
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL);
|
|
|
|
if ((retval = ext2fs_file_lseek(data->file, offset,
|
|
EXT2_SEEK_SET, 0)))
|
|
return retval;
|
|
|
|
return ext2fs_file_write(data->file, buf, size, 0);
|
|
}
|
|
|
|
/*
|
|
* Flush data buffers to disk.
|
|
*/
|
|
static errcode_t inode_flush(io_channel channel)
|
|
{
|
|
struct inode_private_data *data;
|
|
|
|
EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
|
|
data = (struct inode_private_data *) channel->private_data;
|
|
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_INODE_IO_CHANNEL);
|
|
|
|
return ext2fs_file_flush(data->file);
|
|
}
|
|
|