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-rw-r--r--libparted/fs/r/fat/resize.c876
1 files changed, 876 insertions, 0 deletions
diff --git a/libparted/fs/r/fat/resize.c b/libparted/fs/r/fat/resize.c
new file mode 100644
index 0000000..78dede4
--- /dev/null
+++ b/libparted/fs/r/fat/resize.c
@@ -0,0 +1,876 @@
+/*
+ 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 */