parted-1.8.7/libparted/fs/hfs/advfs_plus.c - nest-learning-thermostat/5.1.8/parted - Git at Google

 /*
     libparted - a library for manipulating disk partitions
     Copyright (C) 2004, 2005 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 2 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, write to the Free Software
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

 #ifndef DISCOVER_ONLY

 #include <config.h>

 #include <parted/parted.h>
 #include <parted/endian.h>
 #include <parted/debug.h>

 #if ENABLE_NLS
 #  include <libintl.h>
 #  define _(String) dgettext (PACKAGE, String)
 #else
 #  define _(String) (String)
 #endif /* ENABLE_NLS */

 #include "hfs.h"
 #include "advfs.h"
 #include "file_plus.h"

 #include "advfs_plus.h"

 /* - if a < b, 0 if a == b, + if a > b */
 /* Comparaison is done in the following order : */
 /* CNID, then fork type, then start block */
 static int
 hfsplus_extent_key_cmp(HfsPPrivateGenericKey* a, HfsPPrivateGenericKey* b)
 {
 	HfsPExtentKey* key1 = (HfsPExtentKey*) a;
 	HfsPExtentKey* key2 = (HfsPExtentKey*) b;

 	if (key1->file_ID != key2->file_ID)
 		return PED_BE32_TO_CPU(key1->file_ID) <
 		       PED_BE32_TO_CPU(key2->file_ID) ?
 				-1 : +1;

 	if (key1->type != key2->type)
 		return (int)(key1->type - key2->type);

 	if (key1->start == key2->start)
 		return 0;
 	return PED_BE32_TO_CPU(key1->start) <
 	       PED_BE32_TO_CPU(key2->start) ?
 			-1 : +1;
 }

 /* do a B-Tree lookup */
 /* read the first record immediatly inferior or egal to the given key */
 /* return 0 on error */
 /* record_out _must_ be large enough to receive the whole record (key + data) */
 /* WARNING : the search function called only handle Extents BTree */
 /*	     so modify this function if you want to do lookup in */
 /* 	     other BTrees has well */
 int
 hfsplus_btree_search (HfsPPrivateFile* b_tree_file, HfsPPrivateGenericKey* key,
 		      void *record_out, unsigned int record_size,
 		      HfsCPrivateLeafRec* record_ref)
 {
 	uint8_t			node_1[PED_SECTOR_SIZE_DEFAULT];
 	uint8_t*		node;
 	HfsPHeaderRecord*	header;
 	HfsPNodeDescriptor*	desc = (HfsPNodeDescriptor*) node_1;
 	HfsPPrivateGenericKey*	record_key = NULL;
 	unsigned int		node_number, record_number, size, bsize;
 	int			i;

 	/* Read the header node */
 	if (!hfsplus_file_read_sector(b_tree_file, node_1, 0))
 		return 0;
 	header = (HfsPHeaderRecord*) (node_1 + HFS_FIRST_REC);

 	/* Get the node number of the root */
 	node_number = PED_BE32_TO_CPU (header->root_node);
 	if (!node_number)
 		return 0;

 	/* Get the size of a node in sectors and allocate buffer */
 	size = (bsize = PED_BE16_TO_CPU (header->node_size)) / PED_SECTOR_SIZE_DEFAULT;
 	node = (uint8_t*) ped_malloc (bsize);
 	if (!node)
 		return 0;
 	desc = (HfsPNodeDescriptor*) node;

 	/* Read the root node */
 	if (!hfsplus_file_read (b_tree_file, node,
 				(PedSector) node_number * size, size))
 		return 0;

 	/* Follow the white rabbit */
 	while (1) {
 		record_number = PED_BE16_TO_CPU (desc->rec_nb);
 		for (i = record_number; i; i--) {
 			record_key = (HfsPPrivateGenericKey*)
 			    (node + PED_BE16_TO_CPU(*((uint16_t *)
 					(node+(bsize - 2*i)))));
 			/* check for obvious error in FS */
 			if (((uint8_t*)record_key - node < HFS_FIRST_REC)
 			    || ((uint8_t*)record_key - node
 				>= (signed)bsize
 				   - 2 * (signed)(record_number+1))) {
 				ped_exception_throw (
 					PED_EXCEPTION_ERROR,
 					PED_EXCEPTION_CANCEL,
 					_("The file system contains errors."));
 				ped_free (node);
 				return 0;
 			}
 			if (hfsplus_extent_key_cmp(record_key, key) <= 0)
 				break;
 		}
 		if (!i) { ped_free (node); return 0; }
 		if (desc->type == HFS_IDX_NODE) {
 			unsigned int 	skip;

 			skip = ( 2 + PED_BE16_TO_CPU (record_key->key_length)
 			         + 1 ) & ~1;
 			node_number = PED_BE32_TO_CPU (*((uint32_t *)
 					(((uint8_t *) record_key) + skip)));
 			if (!hfsplus_file_read(b_tree_file, node,
 					       (PedSector) node_number * size,
 					       size)) {
 				ped_free (node);
 				return 0;
 			}
 		} else
 			break;
 	}

 	/* copy the result if needed */
 	if (record_size)
 		memcpy (record_out, record_key, record_size);

 	/* send record reference if needed */
 	if (record_ref) {
 		record_ref->node_size = size;	/* in sectors */
 		record_ref->node_number = node_number;
 		record_ref->record_pos = (uint8_t*)record_key - node;
 		record_ref->record_number = i;
 	}

 	/* success */
 	ped_free (node);
 	return 1;
 }

 /* free the bad blocks linked list */
 void
 hfsplus_free_bad_blocks_list(HfsPPrivateLinkExtent* first)
 {
 	HfsPPrivateLinkExtent*	next;

 	while (first) {
 		next = first->next;
 		ped_free (first);
 		first = next;
 	}
 }

 /* This function reads bad blocks extents in the extents file
    and store it in f.s. specific data of fs */
 int
 hfsplus_read_bad_blocks (const PedFileSystem *fs)
 {
 	HfsPPrivateFSData* 	priv_data = (HfsPPrivateFSData*)
 						    fs->type_specific;

 	if (priv_data->bad_blocks_loaded)
 		return 1;

 	{
 	uint8_t			record[sizeof (HfsPExtentKey)
 				       + sizeof (HfsPExtDataRec)];
 	HfsPExtentKey		search;
 	HfsPExtentKey*		ret_key = (HfsPExtentKey*) record;
 	HfsPExtDescriptor*	ret_cache = (HfsPExtDescriptor*)
 				    (record + sizeof (HfsPExtentKey));
 	int			block, first_pass = 1;
 	unsigned int		last_start;

 	search.key_length = sizeof (HfsExtentKey) - 2;
 	search.type = HFS_DATA_FORK;
 	search.pad = 0;
 	search.file_ID = PED_CPU_TO_BE32 (HFS_BAD_BLOCK_ID);

 	last_start = -1; block = 0;
 	while (1) {
 		int i;

 		search.start = PED_CPU_TO_BE32 (block);
 		if (!hfsplus_btree_search (priv_data->extents_file,
 					   (HfsPPrivateGenericKey*) &search,
 					   record, sizeof (record), NULL)
 		    || ret_key->file_ID != search.file_ID
 		    || ret_key->type != search.type) {
 			if (first_pass)
 				break;
 			else
 				goto errbbp;
 		}
 		if (PED_BE32_TO_CPU (ret_key->start) == last_start)
 			break;

 		last_start = PED_BE32_TO_CPU (ret_key->start);
 		for (i = 0; i < HFSP_EXT_NB; i++) {
 			if (ret_cache[i].block_count) {
 				HfsPPrivateLinkExtent*	new_xt =
 				  (HfsPPrivateLinkExtent*) ped_malloc (
 				    sizeof (HfsPPrivateLinkExtent));
 				if (!new_xt)
 					goto errbbp;
 				new_xt->next = priv_data->bad_blocks_xtent_list;
 				memcpy (&(new_xt->extent), ret_cache+i,
 					sizeof (HfsPExtDescriptor));
 				priv_data->bad_blocks_xtent_list = new_xt;
 				priv_data->bad_blocks_xtent_nb++;
 				block += PED_BE32_TO_CPU (
 						ret_cache[i].block_count);
 			}
 		}
 		first_pass = 0;
 	}

 	priv_data->bad_blocks_loaded = 1;
 	return 1;}

 errbbp: hfsplus_free_bad_blocks_list(priv_data->bad_blocks_xtent_list);
 	priv_data->bad_blocks_xtent_list=NULL;
 	priv_data->bad_blocks_xtent_nb=0;
 	return 0;
 }

 /* This function check if fblock is a bad block */
 int
 hfsplus_is_bad_block (const PedFileSystem *fs, unsigned int fblock)
 {
 	HfsPPrivateFSData* 	priv_data = (HfsPPrivateFSData*)
 						fs->type_specific;
 	HfsPPrivateLinkExtent*	walk;

 	for (walk = priv_data->bad_blocks_xtent_list; walk; walk = walk->next) {
 		/* Won't compile without the strange cast ! gcc bug ? */
 		/* or maybe C subtilties... */
 		if ((fblock >= PED_BE32_TO_CPU (walk->extent.start_block)) &&
 		    (fblock <  (unsigned int)(PED_BE32_TO_CPU (
 						walk->extent.start_block)
 			       + PED_BE32_TO_CPU (walk->extent.block_count))))
 			return 1;
 	}

 	return 0;
 }

 /* This function returns the first sector of the last free block of
    an HFS+ volume we can get after a hfsplus_pack_free_space_from_block call */
 PedSector
 hfsplus_get_empty_end (const PedFileSystem *fs)
 {
 	HfsPPrivateFSData* 	priv_data = (HfsPPrivateFSData*)
 						    fs->type_specific;
 	HfsPVolumeHeader* 	vh = priv_data->vh;
 	HfsPPrivateLinkExtent*	link;
 	unsigned int		block, last_bad, end_free_blocks;

 	/* find the next block to the last bad block of the volume */
 	if (!hfsplus_read_bad_blocks (fs)) {
 		ped_exception_throw (
 			PED_EXCEPTION_ERROR,
 			PED_EXCEPTION_CANCEL,
 			_("Bad blocks could not be read."));
 		return 0;
 	}

 	last_bad = 0;
 	for (link = priv_data->bad_blocks_xtent_list; link; link = link->next) {
 		if ((unsigned int) PED_BE32_TO_CPU (link->extent.start_block)
 		    + PED_BE32_TO_CPU (link->extent.block_count) > last_bad)
 			last_bad = PED_BE32_TO_CPU (link->extent.start_block)
 			           + PED_BE32_TO_CPU (link->extent.block_count);
 	}

 	/* Count the free blocks from last_bad to the end of the volume */
 	end_free_blocks = 0;
 	for (block = last_bad;
 	     block < PED_BE32_TO_CPU (vh->total_blocks);
 	     block++) {
 		if (!TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
 			end_free_blocks++;
 	}

 	/* Calculate the block that will by the first free at
 	   the end of the volume */
 	block = PED_BE32_TO_CPU (vh->total_blocks) - end_free_blocks;

 	return (PedSector) block * ( PED_BE32_TO_CPU (vh->block_size)
 				     / PED_SECTOR_SIZE_DEFAULT );
 }

 /* On error, returns 0 */
 PedSector
 hfsplus_get_min_size (const PedFileSystem *fs)
 {
 	HfsPPrivateFSData* 	priv_data = (HfsPPrivateFSData*)
 						fs->type_specific;
 	PedSector		min_size;

 	/* don't need to add anything because every sector
 	   can be part of allocation blocks in HFS+, and
 	   the last block _must_ be reserved */
 	min_size = hfsplus_get_empty_end(fs);
 	if (!min_size) return 0;

 	if (priv_data->wrapper) {
 		HfsPrivateFSData* 	hfs_priv_data = (HfsPrivateFSData*)
 					    priv_data->wrapper->type_specific;
 		unsigned int		hfs_sect_block;
 		PedSector		hgee;
 		hfs_sect_block =
 		    PED_BE32_TO_CPU (hfs_priv_data->mdb->block_size)
 		    / PED_SECTOR_SIZE_DEFAULT;
 		/*
 		 * if hfs+ is embedded in an hfs wrapper then the new size is :
 		 * the new size of the hfs+ volume rounded up to the size
 		 *     of hfs blocks
 		 * + the minimum size of the hfs wrapper without any hfs+
 		 *     modification
 		 * - the current size of the hfs+ volume in the hfs wrapper
 		 */
 		hgee = hfs_get_empty_end(priv_data->wrapper);
 		if (!hgee) return 0;
 		min_size = ((min_size + hfs_sect_block - 1) / hfs_sect_block)
 			   * hfs_sect_block
 			 + hgee + 2
 			 - (PedSector) PED_BE16_TO_CPU ( hfs_priv_data->mdb
 							->old_new.embedded
 							.location.block_count )
 			   * hfs_sect_block;
 	}

 	return min_size;
 }

 /* return the block which should be used to pack data to have
    at least free fblock blocks at the end of the volume */
 unsigned int
 hfsplus_find_start_pack (const PedFileSystem *fs, unsigned int fblock)
 {
 	HfsPPrivateFSData* 	priv_data = (HfsPPrivateFSData*)
 						fs->type_specific;
 	unsigned int		block;

 	for (block = PED_BE32_TO_CPU (priv_data->vh->total_blocks) - 1;
 	     block && fblock;
 	     block--) {
 		if (!TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
 			fblock--;
 	}

 	while (block && !TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
 		block--;
 	if (TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
 		block++;

 	return block;
 }

 #endif /* !DISCOVER_ONLY */
	/*
	libparted - a library for manipulating disk partitions
	Copyright (C) 2004, 2005 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 2 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, write to the Free Software
	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
	*/

	#ifndef DISCOVER_ONLY

	#include <config.h>

	#include <parted/parted.h>
	#include <parted/endian.h>
	#include <parted/debug.h>

	#if ENABLE_NLS
	# include <libintl.h>
	# define _(String) dgettext (PACKAGE, String)
	#else
	# define _(String) (String)
	#endif /* ENABLE_NLS */

	#include "hfs.h"
	#include "advfs.h"
	#include "file_plus.h"

	#include "advfs_plus.h"

	/* - if a < b, 0 if a == b, + if a > b */
	/* Comparaison is done in the following order : */
	/* CNID, then fork type, then start block */
	static int
	hfsplus_extent_key_cmp(HfsPPrivateGenericKey* a, HfsPPrivateGenericKey* b)
	{
	HfsPExtentKey* key1 = (HfsPExtentKey*) a;
	HfsPExtentKey* key2 = (HfsPExtentKey*) b;

	if (key1->file_ID != key2->file_ID)
	return PED_BE32_TO_CPU(key1->file_ID) <
	PED_BE32_TO_CPU(key2->file_ID) ?
	-1 : +1;

	if (key1->type != key2->type)
	return (int)(key1->type - key2->type);

	if (key1->start == key2->start)
	return 0;
	return PED_BE32_TO_CPU(key1->start) <
	PED_BE32_TO_CPU(key2->start) ?
	-1 : +1;
	}

	/* do a B-Tree lookup */
	/* read the first record immediatly inferior or egal to the given key */
	/* return 0 on error */
	/* record_out _must_ be large enough to receive the whole record (key + data) */
	/* WARNING : the search function called only handle Extents BTree */
	/* so modify this function if you want to do lookup in */
	/* other BTrees has well */
	int
	hfsplus_btree_search (HfsPPrivateFile* b_tree_file, HfsPPrivateGenericKey* key,
	void *record_out, unsigned int record_size,
	HfsCPrivateLeafRec* record_ref)
	{
	uint8_t node_1[PED_SECTOR_SIZE_DEFAULT];
	uint8_t* node;
	HfsPHeaderRecord* header;
	HfsPNodeDescriptor* desc = (HfsPNodeDescriptor*) node_1;
	HfsPPrivateGenericKey* record_key = NULL;
	unsigned int node_number, record_number, size, bsize;
	int i;

	/* Read the header node */
	if (!hfsplus_file_read_sector(b_tree_file, node_1, 0))
	return 0;
	header = (HfsPHeaderRecord*) (node_1 + HFS_FIRST_REC);

	/* Get the node number of the root */
	node_number = PED_BE32_TO_CPU (header->root_node);
	if (!node_number)
	return 0;

	/* Get the size of a node in sectors and allocate buffer */
	size = (bsize = PED_BE16_TO_CPU (header->node_size)) / PED_SECTOR_SIZE_DEFAULT;
	node = (uint8_t*) ped_malloc (bsize);
	if (!node)
	return 0;
	desc = (HfsPNodeDescriptor*) node;

	/* Read the root node */
	if (!hfsplus_file_read (b_tree_file, node,
	(PedSector) node_number * size, size))
	return 0;

	/* Follow the white rabbit */
	while (1) {
	record_number = PED_BE16_TO_CPU (desc->rec_nb);
	for (i = record_number; i; i--) {
	record_key = (HfsPPrivateGenericKey*)
	(node + PED_BE16_TO_CPU(((uint16_t )
	(node+(bsize - 2*i)))));
	/* check for obvious error in FS */
	if (((uint8_t*)record_key - node < HFS_FIRST_REC)
	\|\| ((uint8_t*)record_key - node
	>= (signed)bsize
	- 2 * (signed)(record_number+1))) {
	ped_exception_throw (
	PED_EXCEPTION_ERROR,
	PED_EXCEPTION_CANCEL,
	_("The file system contains errors."));
	ped_free (node);
	return 0;
	}
	if (hfsplus_extent_key_cmp(record_key, key) <= 0)
	break;
	}
	if (!i) { ped_free (node); return 0; }
	if (desc->type == HFS_IDX_NODE) {
	unsigned int skip;

	skip = ( 2 + PED_BE16_TO_CPU (record_key->key_length)
	+ 1 ) & ~1;
	node_number = PED_BE32_TO_CPU (((uint32_t )
	(((uint8_t *) record_key) + skip)));
	if (!hfsplus_file_read(b_tree_file, node,
	(PedSector) node_number * size,
	size)) {
	ped_free (node);
	return 0;
	}
	} else
	break;
	}

	/* copy the result if needed */
	if (record_size)
	memcpy (record_out, record_key, record_size);

	/* send record reference if needed */
	if (record_ref) {
	record_ref->node_size = size; /* in sectors */
	record_ref->node_number = node_number;
	record_ref->record_pos = (uint8_t*)record_key - node;
	record_ref->record_number = i;
	}

	/* success */
	ped_free (node);
	return 1;
	}

	/* free the bad blocks linked list */
	void
	hfsplus_free_bad_blocks_list(HfsPPrivateLinkExtent* first)
	{
	HfsPPrivateLinkExtent* next;

	while (first) {
	next = first->next;
	ped_free (first);
	first = next;
	}
	}

	/* This function reads bad blocks extents in the extents file
	and store it in f.s. specific data of fs */
	int
	hfsplus_read_bad_blocks (const PedFileSystem *fs)
	{
	HfsPPrivateFSData* priv_data = (HfsPPrivateFSData*)
	fs->type_specific;

	if (priv_data->bad_blocks_loaded)
	return 1;

	{
	uint8_t record[sizeof (HfsPExtentKey)
	+ sizeof (HfsPExtDataRec)];
	HfsPExtentKey search;
	HfsPExtentKey* ret_key = (HfsPExtentKey*) record;
	HfsPExtDescriptor* ret_cache = (HfsPExtDescriptor*)
	(record + sizeof (HfsPExtentKey));
	int block, first_pass = 1;
	unsigned int last_start;

	search.key_length = sizeof (HfsExtentKey) - 2;
	search.type = HFS_DATA_FORK;
	search.pad = 0;
	search.file_ID = PED_CPU_TO_BE32 (HFS_BAD_BLOCK_ID);

	last_start = -1; block = 0;
	while (1) {
	int i;

	search.start = PED_CPU_TO_BE32 (block);
	if (!hfsplus_btree_search (priv_data->extents_file,
	(HfsPPrivateGenericKey*) &search,
	record, sizeof (record), NULL)
	\|\| ret_key->file_ID != search.file_ID
	\|\| ret_key->type != search.type) {
	if (first_pass)
	break;
	else
	goto errbbp;
	}
	if (PED_BE32_TO_CPU (ret_key->start) == last_start)
	break;

	last_start = PED_BE32_TO_CPU (ret_key->start);
	for (i = 0; i < HFSP_EXT_NB; i++) {
	if (ret_cache[i].block_count) {
	HfsPPrivateLinkExtent* new_xt =
	(HfsPPrivateLinkExtent*) ped_malloc (
	sizeof (HfsPPrivateLinkExtent));
	if (!new_xt)
	goto errbbp;
	new_xt->next = priv_data->bad_blocks_xtent_list;
	memcpy (&(new_xt->extent), ret_cache+i,
	sizeof (HfsPExtDescriptor));
	priv_data->bad_blocks_xtent_list = new_xt;
	priv_data->bad_blocks_xtent_nb++;
	block += PED_BE32_TO_CPU (
	ret_cache[i].block_count);
	}
	}
	first_pass = 0;
	}

	priv_data->bad_blocks_loaded = 1;
	return 1;}

	errbbp: hfsplus_free_bad_blocks_list(priv_data->bad_blocks_xtent_list);
	priv_data->bad_blocks_xtent_list=NULL;
	priv_data->bad_blocks_xtent_nb=0;
	return 0;
	}

	/* This function check if fblock is a bad block */
	int
	hfsplus_is_bad_block (const PedFileSystem *fs, unsigned int fblock)
	{
	HfsPPrivateFSData* priv_data = (HfsPPrivateFSData*)
	fs->type_specific;
	HfsPPrivateLinkExtent* walk;

	for (walk = priv_data->bad_blocks_xtent_list; walk; walk = walk->next) {
	/* Won't compile without the strange cast ! gcc bug ? */
	/* or maybe C subtilties... */
	if ((fblock >= PED_BE32_TO_CPU (walk->extent.start_block)) &&
	(fblock < (unsigned int)(PED_BE32_TO_CPU (
	walk->extent.start_block)
	+ PED_BE32_TO_CPU (walk->extent.block_count))))
	return 1;
	}

	return 0;
	}

	/* This function returns the first sector of the last free block of
	an HFS+ volume we can get after a hfsplus_pack_free_space_from_block call */
	PedSector
	hfsplus_get_empty_end (const PedFileSystem *fs)
	{
	HfsPPrivateFSData* priv_data = (HfsPPrivateFSData*)
	fs->type_specific;
	HfsPVolumeHeader* vh = priv_data->vh;
	HfsPPrivateLinkExtent* link;
	unsigned int block, last_bad, end_free_blocks;

	/* find the next block to the last bad block of the volume */
	if (!hfsplus_read_bad_blocks (fs)) {
	ped_exception_throw (
	PED_EXCEPTION_ERROR,
	PED_EXCEPTION_CANCEL,
	_("Bad blocks could not be read."));
	return 0;
	}

	last_bad = 0;
	for (link = priv_data->bad_blocks_xtent_list; link; link = link->next) {
	if ((unsigned int) PED_BE32_TO_CPU (link->extent.start_block)
	+ PED_BE32_TO_CPU (link->extent.block_count) > last_bad)
	last_bad = PED_BE32_TO_CPU (link->extent.start_block)
	+ PED_BE32_TO_CPU (link->extent.block_count);
	}

	/* Count the free blocks from last_bad to the end of the volume */
	end_free_blocks = 0;
	for (block = last_bad;
	block < PED_BE32_TO_CPU (vh->total_blocks);
	block++) {
	if (!TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
	end_free_blocks++;
	}

	/* Calculate the block that will by the first free at
	the end of the volume */
	block = PED_BE32_TO_CPU (vh->total_blocks) - end_free_blocks;

	return (PedSector) block * ( PED_BE32_TO_CPU (vh->block_size)
	/ PED_SECTOR_SIZE_DEFAULT );
	}

	/* On error, returns 0 */
	PedSector
	hfsplus_get_min_size (const PedFileSystem *fs)
	{
	HfsPPrivateFSData* priv_data = (HfsPPrivateFSData*)
	fs->type_specific;
	PedSector min_size;

	/* don't need to add anything because every sector
	can be part of allocation blocks in HFS+, and
	the last block _must_ be reserved */
	min_size = hfsplus_get_empty_end(fs);
	if (!min_size) return 0;

	if (priv_data->wrapper) {
	HfsPrivateFSData* hfs_priv_data = (HfsPrivateFSData*)
	priv_data->wrapper->type_specific;
	unsigned int hfs_sect_block;
	PedSector hgee;
	hfs_sect_block =
	PED_BE32_TO_CPU (hfs_priv_data->mdb->block_size)
	/ PED_SECTOR_SIZE_DEFAULT;
	/*
	* if hfs+ is embedded in an hfs wrapper then the new size is :
	* the new size of the hfs+ volume rounded up to the size
	* of hfs blocks
	* + the minimum size of the hfs wrapper without any hfs+
	* modification
	* - the current size of the hfs+ volume in the hfs wrapper
	*/
	hgee = hfs_get_empty_end(priv_data->wrapper);
	if (!hgee) return 0;
	min_size = ((min_size + hfs_sect_block - 1) / hfs_sect_block)
	* hfs_sect_block
	+ hgee + 2
	- (PedSector) PED_BE16_TO_CPU ( hfs_priv_data->mdb
	->old_new.embedded
	.location.block_count )
	* hfs_sect_block;
	}

	return min_size;
	}

	/* return the block which should be used to pack data to have
	at least free fblock blocks at the end of the volume */
	unsigned int
	hfsplus_find_start_pack (const PedFileSystem *fs, unsigned int fblock)
	{
	HfsPPrivateFSData* priv_data = (HfsPPrivateFSData*)
	fs->type_specific;
	unsigned int block;

	for (block = PED_BE32_TO_CPU (priv_data->vh->total_blocks) - 1;
	block && fblock;
	block--) {
	if (!TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
	fblock--;
	}

	while (block && !TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
	block--;
	if (TST_BLOC_OCCUPATION(priv_data->alloc_map,block))
	block++;

	return block;
	}

	#endif /* !DISCOVER_ONLY */