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f9e5ee95e9b70033c242d92eee0d4c27286fcc66
pmt/jni/parted/libparted/fs/r/fat/resize.c
YZBruh a6c9feb4d6 pmt: initial 3.0.2 update
2024-12-14 11:17:56 +03:00

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/*
libparted
Copyright (C) 1998-2000, 2007-2014, 2019-2023 Free Software Foundation,
Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "fat.h"
#include "traverse.h"
#include "count.h"
#include "fatio.h"
#include "calc.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <stdarg.h>
#include <string.h>
#ifndef DISCOVER_ONLY
/* Recursively builds (i.e. makes consistent) the duplicated directory tree
* (leaving the original directory tree in tact)
*/
static int
fat_construct_directory (FatOpContext* ctx, FatTraverseInfo* trav_info)
{
FatTraverseInfo* sub_dir_info;
FatDirEntry* dir_entry;
FatCluster old_first_cluster;
while ( (dir_entry = fat_traverse_next_dir_entry (trav_info)) ) {
if (fat_dir_entry_is_null_term (dir_entry))
break;
if (!fat_dir_entry_has_first_cluster (dir_entry, ctx->old_fs))
continue;
fat_traverse_mark_dirty (trav_info);
old_first_cluster = fat_dir_entry_get_first_cluster (dir_entry,
ctx->old_fs);
fat_dir_entry_set_first_cluster (dir_entry, ctx->new_fs,
fat_op_context_map_cluster (ctx, old_first_cluster));
if (fat_dir_entry_is_directory (dir_entry)
&& dir_entry->name [0] != '.') {
sub_dir_info
= fat_traverse_directory (trav_info, dir_entry);
if (!sub_dir_info)
return 0;
if (!fat_construct_directory (ctx, sub_dir_info))
return 0;
}
}
/* remove "stale" entries at the end */
while ((dir_entry = fat_traverse_next_dir_entry (trav_info))) {
memset (dir_entry, 0, sizeof (FatDirEntry));
fat_traverse_mark_dirty (trav_info);
}
fat_traverse_complete (trav_info);
return 1;
}
static int
duplicate_legacy_root_dir (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
PED_ASSERT (old_fs_info->root_dir_sector_count
== new_fs_info->root_dir_sector_count);
if (!ped_geometry_read (ctx->old_fs->geom, old_fs_info->buffer,
old_fs_info->root_dir_offset,
old_fs_info->root_dir_sector_count))
return 0;
if (!ped_geometry_write (ctx->new_fs->geom, old_fs_info->buffer,
new_fs_info->root_dir_offset,
new_fs_info->root_dir_sector_count))
return 0;
return 1;
}
/*
Constructs the new directory tree for legacy (FAT16) file systems.
*/
static int
fat_construct_legacy_root (FatOpContext* ctx)
{
FatTraverseInfo* trav_info;
if (!duplicate_legacy_root_dir (ctx))
return 0;
trav_info = fat_traverse_begin (ctx->new_fs, FAT_ROOT, "\\");
return fat_construct_directory (ctx, trav_info);
}
/*
Constructs the new directory tree for new (FAT32) file systems.
*/
static int
fat_construct_root (FatOpContext* ctx)
{
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatTraverseInfo* trav_info;
trav_info = fat_traverse_begin (ctx->new_fs, new_fs_info->root_cluster,
"\\");
fat_construct_directory (ctx, trav_info);
return 1;
}
/* Converts the root directory between FAT16 and FAT32. NOTE: this code
* can also do no conversion. I'm leaving fat_construct_directory(), because
* it's really pretty :-) It also leaves a higher chance of deleted file
* recovery, because it doesn't remove redundant entries. (We do this here,
* because brain-damaged FAT16 has an arbitary limit on root directory entries,
* so we save room)
*/
static int
fat_convert_directory (FatOpContext* ctx, FatTraverseInfo* old_trav,
FatTraverseInfo* new_trav)
{
FatTraverseInfo* sub_old_dir_trav;
FatTraverseInfo* sub_new_dir_trav;
FatDirEntry* new_dir_entry;
FatDirEntry* old_dir_entry;
FatCluster old_first_cluster;
while ( (old_dir_entry = fat_traverse_next_dir_entry (old_trav)) ) {
if (fat_dir_entry_is_null_term (old_dir_entry))
break;
if (!fat_dir_entry_is_active (old_dir_entry))
continue;
new_dir_entry = fat_traverse_next_dir_entry (new_trav);
if (!new_dir_entry) {
return ped_exception_throw (PED_EXCEPTION_ERROR,
PED_EXCEPTION_IGNORE_CANCEL,
_("There's not enough room in the root "
"directory for all of the files. Either "
"cancel, or ignore to lose the files."))
== PED_EXCEPTION_IGNORE;
}
*new_dir_entry = *old_dir_entry;
fat_traverse_mark_dirty (new_trav);
if (!fat_dir_entry_has_first_cluster (old_dir_entry,
ctx->old_fs))
continue;
old_first_cluster = fat_dir_entry_get_first_cluster (
old_dir_entry, ctx->old_fs);
fat_dir_entry_set_first_cluster (new_dir_entry, ctx->new_fs,
fat_op_context_map_cluster (ctx, old_first_cluster));
if (fat_dir_entry_is_directory (old_dir_entry)
&& old_dir_entry->name [0] != '.') {
sub_old_dir_trav
= fat_traverse_directory (old_trav, old_dir_entry);
if (!sub_old_dir_trav) return 0;
sub_new_dir_trav
= fat_traverse_directory (new_trav, new_dir_entry);
if (!sub_new_dir_trav) {
fat_traverse_complete (sub_old_dir_trav);
return 0;
}
if (!fat_convert_directory (ctx, sub_old_dir_trav,
sub_new_dir_trav))
return 0;
}
}
/* remove "stale" entries at the end, just in case there is some
* overlap
*/
while ((new_dir_entry = fat_traverse_next_dir_entry (new_trav))) {
memset (new_dir_entry, 0, sizeof (FatDirEntry));
fat_traverse_mark_dirty (new_trav);
}
fat_traverse_complete (old_trav);
fat_traverse_complete (new_trav);
return 1;
}
static void
clear_cluster (PedFileSystem* fs, FatCluster cluster)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
memset (fs_info->buffer, 0, fs_info->cluster_size);
fat_write_cluster (fs, fs_info->buffer, cluster);
}
/* This MUST be called BEFORE the fat_construct_new_fat(), because cluster
* allocation depend on the old FAT. The reason is, old clusters may
* still be needed during the resize, (particularly clusters in the directory
* tree) even if they will be discarded later.
*/
static int
alloc_root_dir (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatCluster i;
FatCluster cluster;
FatCluster cluster_count;
PED_ASSERT (new_fs_info->fat_type == FAT_TYPE_FAT32);
cluster_count = ped_div_round_up (
PED_MAX (16, old_fs_info->root_dir_sector_count),
new_fs_info->cluster_sectors);
for (i = 0; i < cluster_count; i++) {
cluster = fat_table_alloc_check_cluster (new_fs_info->fat,
ctx->new_fs);
if (!cluster)
return 0;
ctx->new_root_dir [i] = cluster;
clear_cluster (ctx->new_fs, cluster);
}
ctx->new_root_dir [i] = 0;
new_fs_info->root_cluster = ctx->new_root_dir [0];
return 1;
}
/* when converting FAT32 -> FAT16
* fat_duplicate clusters() duplicated the root directory unnecessarily.
* Let's free it.
*
* This must be called AFTER fat_construct_new_fat(). (otherwise, our
* changes just get overwritten)
*/
static int
free_root_dir (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatCluster old_cluster;
FatFragment i;
PED_ASSERT (old_fs_info->fat_type == FAT_TYPE_FAT32);
PED_ASSERT (new_fs_info->fat_type == FAT_TYPE_FAT16);
for (old_cluster = old_fs_info->root_cluster;
!fat_table_is_eof (old_fs_info->fat, old_cluster);
old_cluster = fat_table_get (old_fs_info->fat, old_cluster)) {
FatFragment old_frag;
old_frag = fat_cluster_to_frag (ctx->old_fs, old_cluster);
for (i = 0; i < new_fs_info->cluster_frags; i++) {
FatFragment new_frag;
FatCluster new_clst;
new_frag = fat_op_context_map_fragment (ctx,
old_frag + i);
new_clst = fat_frag_to_cluster (ctx->old_fs, new_frag);
if (!fat_table_set_avail (new_fs_info->fat, new_clst))
return 0;
}
}
return 1;
}
static int
fat_clear_root_dir (PedFileSystem* fs)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
int i;
PED_ASSERT (fs_info->fat_type == FAT_TYPE_FAT16);
PED_ASSERT (fs_info->root_dir_sector_count);
memset (fs_info->buffer, 0, 512);
for (i = 0; i < fs_info->root_dir_sector_count; i++) {
if (!ped_geometry_write (fs->geom, fs_info->buffer,
fs_info->root_dir_offset + i, 1)) {
if (ped_exception_throw (PED_EXCEPTION_ERROR,
PED_EXCEPTION_IGNORE_CANCEL,
_("Error writing to the root directory."))
== PED_EXCEPTION_CANCEL)
return 0;
}
}
return 1;
}
static int
fat_construct_converted_tree (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatTraverseInfo* old_trav_info;
FatTraverseInfo* new_trav_info;
if (new_fs_info->fat_type == FAT_TYPE_FAT32) {
new_trav_info = fat_traverse_begin (ctx->new_fs,
new_fs_info->root_cluster, "\\");
if (!new_trav_info) return 0;
old_trav_info = fat_traverse_begin (ctx->old_fs, FAT_ROOT,
"\\");
} else {
fat_clear_root_dir (ctx->new_fs);
new_trav_info = fat_traverse_begin (ctx->new_fs, FAT_ROOT,
"\\");
if (!new_trav_info) return 0;
old_trav_info = fat_traverse_begin (ctx->old_fs,
old_fs_info->root_cluster, "\\");
}
if (!old_trav_info) {
fat_traverse_complete (new_trav_info);
return 0;
}
if (!fat_convert_directory (ctx, old_trav_info, new_trav_info))
return 0;
return 1;
}
/*
Constructs the new directory tree to match the new file locations.
*/
static int
fat_construct_dir_tree (FatOpContext* ctx)
{
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
if (new_fs_info->fat_type == old_fs_info->fat_type) {
switch (old_fs_info->fat_type) {
case FAT_TYPE_FAT12:
PED_ASSERT (0);
break;
case FAT_TYPE_FAT16:
return fat_construct_legacy_root (ctx);
case FAT_TYPE_FAT32:
return fat_construct_root (ctx);
}
} else {
return fat_construct_converted_tree (ctx);
}
return 0;
}
static FatFragment
_get_next_old_frag (FatOpContext* ctx, FatFragment frag)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatCluster cluster;
FatCluster next_cluster;
if ((frag + 1) % old_fs_info->cluster_frags != 0) {
if (fat_is_fragment_active (ctx->old_fs, frag + 1))
return frag + 1;
else
return -1;
} else {
cluster = fat_frag_to_cluster (ctx->old_fs, frag);
next_cluster = fat_table_get (old_fs_info->fat, cluster);
if (fat_table_is_eof (old_fs_info->fat, next_cluster))
return -1;
else
return fat_cluster_to_frag (ctx->old_fs, next_cluster);
}
}
/*
Constructs the new fat for the resized file system.
*/
static int
fat_construct_new_fat (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
FatFragment old_frag;
FatCluster new_cluster;
FatFragment new_frag;
FatFragment old_next_frag;
FatFragment new_next_frag;
FatCluster new_next_cluster;
FatClusterFlag flag;
int i;
fat_table_clear (new_fs_info->fat);
if (!fat_table_set_cluster_count (new_fs_info->fat,
new_fs_info->cluster_count))
return 0;
for (old_frag = 0; old_frag < old_fs_info->frag_count; old_frag++) {
flag = fat_get_fragment_flag (ctx->old_fs, old_frag);
if (flag == FAT_FLAG_FREE)
continue;
if (flag == FAT_FLAG_BAD) {
new_frag = fat_op_context_map_static_fragment (
ctx, old_frag);
if (new_frag == -1)
continue;
new_cluster = fat_frag_to_cluster (ctx->new_fs,
new_frag);
fat_table_set_bad (new_fs_info->fat, new_cluster);
continue;
}
new_frag = fat_op_context_map_fragment (ctx, old_frag);
new_cluster = fat_frag_to_cluster (ctx->new_fs, new_frag);
old_next_frag = _get_next_old_frag (ctx, old_frag);
if (old_next_frag == -1) {
fat_table_set_eof (new_fs_info->fat, new_cluster);
continue;
}
new_next_frag = fat_op_context_map_fragment (ctx,
old_next_frag);
PED_ASSERT (new_next_frag != -1);
new_next_cluster = fat_frag_to_cluster (ctx->new_fs,
new_next_frag);
PED_ASSERT (new_next_cluster != new_cluster);
fat_table_set (new_fs_info->fat, new_cluster, new_next_cluster);
}
if (old_fs_info->fat_type == FAT_TYPE_FAT32
&& new_fs_info->fat_type == FAT_TYPE_FAT32) {
new_fs_info->root_cluster
= fat_op_context_map_cluster (ctx,
old_fs_info->root_cluster);
}
if (old_fs_info->fat_type == FAT_TYPE_FAT16
&& new_fs_info->fat_type == FAT_TYPE_FAT32) {
for (i=0; ctx->new_root_dir[i+1]; i++) {
fat_table_set (new_fs_info->fat,
ctx->new_root_dir[i],
ctx->new_root_dir[i+1]);
}
fat_table_set_eof (new_fs_info->fat, ctx->new_root_dir[i]);
}
return 1;
}
static int
ask_type (PedFileSystem* fs, int fat16_ok, int fat32_ok, FatType* out_fat_type)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
PedExceptionOption status;
const char* fat16_msg;
const char* fat32_msg;
if (fs_info->fat_type == FAT_TYPE_FAT16)
fat16_msg = _("If you leave your file system as FAT16, "
"then you will have no problems.");
else
fat16_msg = _("If you convert to FAT16, and MS Windows "
"is installed on this partition, then "
"you must re-install the MS Windows boot "
"loader. If you want to do this, you "
"should consult the Parted manual (or "
"your distribution's manual).");
if (fs_info->fat_type == FAT_TYPE_FAT32)
fat32_msg = _("If you leave your file system as FAT32, "
"then you will not introduce any new "
"problems.");
else
fat32_msg = _("If you convert to FAT32, and MS Windows "
"is installed on this partition, then "
"you must re-install the MS Windows boot "
"loader. If you want to do this, you "
"should consult the Parted manual (or "
"your distribution's manual). Also, "
"converting to FAT32 will make the file "
"system unreadable by MS DOS, MS Windows "
"95a, and MS Windows NT.");
if (fat16_ok && fat32_ok) {
status = ped_exception_throw (
PED_EXCEPTION_INFORMATION,
PED_EXCEPTION_YES_NO_CANCEL,
_("%s %s %s"),
_("Would you like to use FAT32?"),
fat16_msg,
fat32_msg);
switch (status) {
case PED_EXCEPTION_YES:
*out_fat_type = FAT_TYPE_FAT32;
return 1;
case PED_EXCEPTION_NO:
*out_fat_type = FAT_TYPE_FAT16;
return 1;
case PED_EXCEPTION_UNHANDLED:
*out_fat_type = fs_info->fat_type;
return 1;
case PED_EXCEPTION_CANCEL:
return 0;
default:
PED_ASSERT (0);
break;
}
}
if (fat16_ok) {
if (fs_info->fat_type != FAT_TYPE_FAT16) {
status = ped_exception_throw (
PED_EXCEPTION_WARNING,
PED_EXCEPTION_OK_CANCEL,
_("%s %s"),
_("The file system can only be resized to this "
"size by converting to FAT16."),
fat16_msg);
if (status == PED_EXCEPTION_CANCEL)
return 0;
}
*out_fat_type = FAT_TYPE_FAT16;
return 1;
}
if (fat32_ok) {
if (fs_info->fat_type != FAT_TYPE_FAT32) {
status = ped_exception_throw (
PED_EXCEPTION_WARNING,
PED_EXCEPTION_OK_CANCEL,
_("%s %s"),
_("The file system can only be resized to this "
"size by converting to FAT32."),
fat32_msg);
if (status == PED_EXCEPTION_CANCEL)
return 0;
}
*out_fat_type = FAT_TYPE_FAT32;
return 1;
}
ped_exception_throw (
PED_EXCEPTION_NO_FEATURE,
PED_EXCEPTION_CANCEL,
_("GNU Parted cannot resize this partition to this size. "
"We're working on it!"));
return 0;
}
/* For resize operations: determine if the file system must be FAT16 or FAT32,
* or either. If the new file system must be FAT32, then query for
* confirmation. If either file system can be used, query for which one.
*/
static int
get_fat_type (PedFileSystem* fs, const PedGeometry* new_geom,
FatType* out_fat_type)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
PedSector fat16_cluster_sectors;
PedSector fat32_cluster_sectors;
FatCluster dummy_cluster_count;
PedSector dummy_fat_sectors;
int fat16_ok;
int fat32_ok;
fat16_ok = fat_calc_resize_sizes (
new_geom,
fs_info->cluster_sectors,
FAT_TYPE_FAT16,
fs_info->root_dir_sector_count,
fs_info->cluster_sectors,
&fat16_cluster_sectors,
&dummy_cluster_count,
&dummy_fat_sectors);
fat32_ok = fat_calc_resize_sizes (
new_geom,
fs_info->cluster_sectors,
FAT_TYPE_FAT32,
fs_info->root_dir_sector_count,
fs_info->cluster_sectors,
&fat32_cluster_sectors,
&dummy_cluster_count,
&dummy_fat_sectors);
return ask_type (fs, fat16_ok, fat32_ok, out_fat_type);
}
/* Creates the PedFileSystem struct for the new resized file system, and
sticks it in a FatOpContext. At the end of the process, the original
(ctx->old_fs) is destroyed, and replaced with the new one (ctx->new_fs).
*/
static FatOpContext*
create_resize_context (PedFileSystem* fs, const PedGeometry* new_geom)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
FatSpecific* new_fs_info;
PedFileSystem* new_fs;
PedSector new_cluster_sectors;
FatCluster new_cluster_count;
PedSector new_fat_sectors;
FatType new_fat_type;
PedSector root_dir_sector_count;
FatOpContext* context;
/* hypothetical number of root dir sectors, if we end up using
* FAT16
*/
if (fs_info->root_dir_sector_count)
root_dir_sector_count = fs_info->root_dir_sector_count;
else
root_dir_sector_count = FAT_ROOT_DIR_ENTRY_COUNT
* sizeof (FatDirEntry) / 512;
if (!get_fat_type (fs, new_geom, &new_fat_type))
return 0;
fat_calc_resize_sizes (new_geom, fs_info->cluster_sectors, new_fat_type,
root_dir_sector_count, fs_info->cluster_sectors,
&new_cluster_sectors, &new_cluster_count, &new_fat_sectors);
if (!fat_check_resize_geometry (fs, new_geom, new_cluster_sectors,
new_cluster_count))
goto error;
new_fs = fat_alloc (new_geom);
if (!new_fs)
goto error;
new_fs_info = FAT_SPECIFIC (new_fs);
if (!new_fs_info)
goto error_free_new_fs;
/* preserve boot code, etc. */
new_fs_info->boot_sector = ped_malloc (new_geom->dev->sector_size);
memcpy (new_fs_info->boot_sector, fs_info->boot_sector,
new_geom->dev->sector_size);
new_fs_info->info_sector = NULL;
if (fs_info->fat_type == FAT_TYPE_FAT32)
{
PED_ASSERT (fs_info->info_sector != NULL);
new_fs_info->info_sector =
ped_malloc (new_geom->dev->sector_size);
memcpy (new_fs_info->info_sector, fs_info->info_sector,
new_geom->dev->sector_size);
}
new_fs_info->logical_sector_size = fs_info->logical_sector_size;
new_fs_info->sector_count = new_geom->length;
new_fs_info->sectors_per_track = fs_info->sectors_per_track;
new_fs_info->heads = fs_info->heads;
new_fs_info->cluster_size = new_cluster_sectors * 512;
new_fs_info->cluster_sectors = new_cluster_sectors;
new_fs_info->cluster_count = new_cluster_count;
new_fs_info->dir_entries_per_cluster = fs_info->dir_entries_per_cluster;
new_fs_info->fat_type = new_fat_type;
new_fs_info->fat_table_count = 2;
new_fs_info->fat_sectors = new_fat_sectors;
/* what about copying? */
new_fs_info->serial_number = fs_info->serial_number;
if (new_fs_info->fat_type == FAT_TYPE_FAT32) {
new_fs_info->info_sector_offset = 1;
new_fs_info->boot_sector_backup_offset = 6;
new_fs_info->root_dir_offset = 0;
new_fs_info->root_dir_entry_count = 0;
new_fs_info->root_dir_sector_count = 0;
/* we add calc_align_sectors to push the cluster_offset
forward, to keep the clusters aligned between the new
and old file systems
*/
new_fs_info->fat_offset
= fat_min_reserved_sector_count (FAT_TYPE_FAT32)
+ fat_calc_align_sectors (new_fs, fs);
new_fs_info->cluster_offset
= new_fs_info->fat_offset
+ 2 * new_fs_info->fat_sectors;
} else {
new_fs_info->root_dir_sector_count = root_dir_sector_count;
new_fs_info->root_dir_entry_count
= root_dir_sector_count * 512 / sizeof (FatDirEntry);
new_fs_info->fat_offset
= fat_min_reserved_sector_count (FAT_TYPE_FAT16)
+ fat_calc_align_sectors (new_fs, fs);
new_fs_info->root_dir_offset = new_fs_info->fat_offset
+ 2 * new_fs_info->fat_sectors;
new_fs_info->cluster_offset = new_fs_info->root_dir_offset
+ new_fs_info->root_dir_sector_count;
}
new_fs_info->total_dir_clusters = fs_info->total_dir_clusters;
context = fat_op_context_new (new_fs, fs);
if (!context)
goto error_free_new_fs_info;
if (!fat_op_context_create_initial_fat (context))
goto error_free_context;
if (!fat_alloc_buffers (new_fs))
goto error_free_fat;
return context;
error_free_fat:
fat_table_destroy (new_fs_info->fat);
error_free_context:
free (context);
error_free_new_fs_info:
free (new_fs_info);
error_free_new_fs:
free (new_fs);
error:
return NULL;
}
static int
resize_context_assimilate (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
fat_free_buffers (ctx->old_fs);
fat_table_destroy (old_fs_info->fat);
free (old_fs_info);
ped_geometry_destroy (ctx->old_fs->geom);
ctx->old_fs->type_specific = ctx->new_fs->type_specific;
ctx->old_fs->geom = ctx->new_fs->geom;
ctx->old_fs->type = (new_fs_info->fat_type == FAT_TYPE_FAT16)
? &fat16_type
: &fat32_type;
free (ctx->new_fs);
fat_op_context_destroy (ctx);
return 1;
}
static int
resize_context_abort (FatOpContext* ctx)
{
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
fat_free_buffers (ctx->new_fs);
fat_table_destroy (new_fs_info->fat);
free (new_fs_info);
ped_geometry_destroy (ctx->new_fs->geom);
free (ctx->new_fs);
fat_op_context_destroy (ctx);
return 1;
}
/* copies the "hidden" sectors, between the boot sector and the FAT. Required,
* for the Windows 98 FAT32 boot loader
*/
int
_copy_hidden_sectors (FatOpContext* ctx)
{
FatSpecific* old_fs_info = FAT_SPECIFIC (ctx->old_fs);
FatSpecific* new_fs_info = FAT_SPECIFIC (ctx->new_fs);
PedSector first = 1;
PedSector last;
PedSector count;
/* nothing to copy for FAT16 */
if (old_fs_info->fat_type == FAT_TYPE_FAT16
|| new_fs_info->fat_type == FAT_TYPE_FAT16)
return 1;
last = PED_MIN (old_fs_info->fat_offset, new_fs_info->fat_offset) - 1;
count = last - first + 1;
PED_ASSERT (count < BUFFER_SIZE);
if (!ped_geometry_read (ctx->old_fs->geom, old_fs_info->buffer,
first, count))
return 0;
if (!ped_geometry_write (ctx->new_fs->geom, old_fs_info->buffer,
first, count))
return 0;
return 1;
}
int
fat_resize (PedFileSystem* fs, PedGeometry* geom, PedTimer* timer)
{
FatSpecific* fs_info = FAT_SPECIFIC (fs);
FatSpecific* new_fs_info;
FatOpContext* ctx;
PedFileSystem* new_fs;
ctx = create_resize_context (fs, geom);
if (!ctx)
goto error;
new_fs = ctx->new_fs;
new_fs_info = FAT_SPECIFIC (new_fs);
if (!fat_duplicate_clusters (ctx, timer))
goto error_abort_ctx;
if (fs_info->fat_type == FAT_TYPE_FAT16
&& new_fs_info->fat_type == FAT_TYPE_FAT32) {
if (!alloc_root_dir (ctx))
goto error_abort_ctx;
}
if (!fat_construct_new_fat (ctx))
goto error_abort_ctx;
if (fs_info->fat_type == FAT_TYPE_FAT32
&& new_fs_info->fat_type == FAT_TYPE_FAT16) {
if (!free_root_dir (ctx))
goto error_abort_ctx;
}
if (!fat_construct_dir_tree (ctx))
goto error_abort_ctx;
if (!fat_table_write_all (new_fs_info->fat, new_fs))
goto error_abort_ctx;
_copy_hidden_sectors (ctx);
fat_boot_sector_generate (&new_fs_info->boot_sector, new_fs);
fat_boot_sector_write (new_fs_info->boot_sector, new_fs);
if (new_fs_info->fat_type == FAT_TYPE_FAT32) {
fat_info_sector_generate (&new_fs_info->info_sector, new_fs);
fat_info_sector_write (new_fs_info->info_sector, new_fs);
}
if (!resize_context_assimilate (ctx))
goto error;
return 1;
error_abort_ctx:
resize_context_abort (ctx);
error:
return 0;
}
#endif /* !DISCOVER_ONLY */
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