fs/udf/partition.c - linux - Git at Google

 /*
  * partition.c
  *
  * PURPOSE
  *      Partition handling routines for the OSTA-UDF(tm) filesystem.
  *
  * COPYRIGHT
  *      This file is distributed under the terms of the GNU General Public
  *      License (GPL). Copies of the GPL can be obtained from:
  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  *      Each contributing author retains all rights to their own work.
  *
  *  (C) 1998-2001 Ben Fennema
  *
  * HISTORY
  *
  * 12/06/98 blf  Created file.
  *
  */

 #include "udfdecl.h"
 #include "udf_sb.h"
 #include "udf_i.h"

 #include <linux/fs.h>
 #include <linux/string.h>
 #include <linux/mutex.h>

 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
 			uint16_t partition, uint32_t offset)
 {
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct udf_part_map *map;
 	if (partition >= sbi->s_partitions) {
 		udf_debug("block=%u, partition=%u, offset=%u: invalid partition\n",
 			  block, partition, offset);
 		return 0xFFFFFFFF;
 	}
 	map = &sbi->s_partmaps[partition];
 	if (map->s_partition_func)
 		return map->s_partition_func(sb, block, partition, offset);
 	else
 		return map->s_partition_root + block + offset;
 }

 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
 			       uint16_t partition, uint32_t offset)
 {
 	struct buffer_head *bh = NULL;
 	uint32_t newblock;
 	uint32_t index;
 	uint32_t loc;
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct udf_part_map *map;
 	struct udf_virtual_data *vdata;
 	struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);

 	map = &sbi->s_partmaps[partition];
 	vdata = &map->s_type_specific.s_virtual;

 	if (block > vdata->s_num_entries) {
 		udf_debug("Trying to access block beyond end of VAT (%u max %u)\n",
 			  block, vdata->s_num_entries);
 		return 0xFFFFFFFF;
 	}

 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 		loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
 			vdata->s_start_offset))[block]);
 		goto translate;
 	}
 	index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
 	if (block >= index) {
 		block -= index;
 		newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
 		index = block % (sb->s_blocksize / sizeof(uint32_t));
 	} else {
 		newblock = 0;
 		index = vdata->s_start_offset / sizeof(uint32_t) + block;
 	}

 	loc = udf_block_map(sbi->s_vat_inode, newblock);

 	bh = sb_bread(sb, loc);
 	if (!bh) {
 		udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u) VAT: %u[%u]\n",
 			  sb, block, partition, loc, index);
 		return 0xFFFFFFFF;
 	}

 	loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);

 	brelse(bh);

 translate:
 	if (iinfo->i_location.partitionReferenceNum == partition) {
 		udf_debug("recursive call to udf_get_pblock!\n");
 		return 0xFFFFFFFF;
 	}

 	return udf_get_pblock(sb, loc,
 			      iinfo->i_location.partitionReferenceNum,
 			      offset);
 }

 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
 				      uint16_t partition, uint32_t offset)
 {
 	return udf_get_pblock_virt15(sb, block, partition, offset);
 }

 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
 			       uint16_t partition, uint32_t offset)
 {
 	int i;
 	struct sparingTable *st = NULL;
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct udf_part_map *map;
 	uint32_t packet;
 	struct udf_sparing_data *sdata;

 	map = &sbi->s_partmaps[partition];
 	sdata = &map->s_type_specific.s_sparing;
 	packet = (block + offset) & ~(sdata->s_packet_len - 1);

 	for (i = 0; i < 4; i++) {
 		if (sdata->s_spar_map[i] != NULL) {
 			st = (struct sparingTable *)
 					sdata->s_spar_map[i]->b_data;
 			break;
 		}
 	}

 	if (st) {
 		for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
 			struct sparingEntry *entry = &st->mapEntry[i];
 			u32 origLoc = le32_to_cpu(entry->origLocation);
 			if (origLoc >= 0xFFFFFFF0)
 				break;
 			else if (origLoc == packet)
 				return le32_to_cpu(entry->mappedLocation) +
 					((block + offset) &
 						(sdata->s_packet_len - 1));
 			else if (origLoc > packet)
 				break;
 		}
 	}

 	return map->s_partition_root + block + offset;
 }

 int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
 {
 	struct udf_sparing_data *sdata;
 	struct sparingTable *st = NULL;
 	struct sparingEntry mapEntry;
 	uint32_t packet;
 	int i, j, k, l;
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	u16 reallocationTableLen;
 	struct buffer_head *bh;
 	int ret = 0;

 	mutex_lock(&sbi->s_alloc_mutex);
 	for (i = 0; i < sbi->s_partitions; i++) {
 		struct udf_part_map *map = &sbi->s_partmaps[i];
 		if (old_block > map->s_partition_root &&
 		    old_block < map->s_partition_root + map->s_partition_len) {
 			sdata = &map->s_type_specific.s_sparing;
 			packet = (old_block - map->s_partition_root) &
 						~(sdata->s_packet_len - 1);

 			for (j = 0; j < 4; j++)
 				if (sdata->s_spar_map[j] != NULL) {
 					st = (struct sparingTable *)
 						sdata->s_spar_map[j]->b_data;
 					break;
 				}

 			if (!st) {
 				ret = 1;
 				goto out;
 			}

 			reallocationTableLen =
 					le16_to_cpu(st->reallocationTableLen);
 			for (k = 0; k < reallocationTableLen; k++) {
 				struct sparingEntry *entry = &st->mapEntry[k];
 				u32 origLoc = le32_to_cpu(entry->origLocation);

 				if (origLoc == 0xFFFFFFFF) {
 					for (; j < 4; j++) {
 						int len;
 						bh = sdata->s_spar_map[j];
 						if (!bh)
 							continue;

 						st = (struct sparingTable *)
 								bh->b_data;
 						entry->origLocation =
 							cpu_to_le32(packet);
 						len =
 						  sizeof(struct sparingTable) +
 						  reallocationTableLen *
 						  sizeof(struct sparingEntry);
 						udf_update_tag((char *)st, len);
 						mark_buffer_dirty(bh);
 					}
 					*new_block = le32_to_cpu(
 							entry->mappedLocation) +
 						     ((old_block -
 							map->s_partition_root) &
 						     (sdata->s_packet_len - 1));
 					ret = 0;
 					goto out;
 				} else if (origLoc == packet) {
 					*new_block = le32_to_cpu(
 							entry->mappedLocation) +
 						     ((old_block -
 							map->s_partition_root) &
 						     (sdata->s_packet_len - 1));
 					ret = 0;
 					goto out;
 				} else if (origLoc > packet)
 					break;
 			}

 			for (l = k; l < reallocationTableLen; l++) {
 				struct sparingEntry *entry = &st->mapEntry[l];
 				u32 origLoc = le32_to_cpu(entry->origLocation);

 				if (origLoc != 0xFFFFFFFF)
 					continue;

 				for (; j < 4; j++) {
 					bh = sdata->s_spar_map[j];
 					if (!bh)
 						continue;

 					st = (struct sparingTable *)bh->b_data;
 					mapEntry = st->mapEntry[l];
 					mapEntry.origLocation =
 							cpu_to_le32(packet);
 					memmove(&st->mapEntry[k + 1],
 						&st->mapEntry[k],
 						(l - k) *
 						sizeof(struct sparingEntry));
 					st->mapEntry[k] = mapEntry;
 					udf_update_tag((char *)st,
 						sizeof(struct sparingTable) +
 						reallocationTableLen *
 						sizeof(struct sparingEntry));
 					mark_buffer_dirty(bh);
 				}
 				*new_block =
 					le32_to_cpu(
 					      st->mapEntry[k].mappedLocation) +
 					((old_block - map->s_partition_root) &
 					 (sdata->s_packet_len - 1));
 				ret = 0;
 				goto out;
 			}

 			ret = 1;
 			goto out;
 		} /* if old_block */
 	}

 	if (i == sbi->s_partitions) {
 		/* outside of partitions */
 		/* for now, fail =) */
 		ret = 1;
 	}

 out:
 	mutex_unlock(&sbi->s_alloc_mutex);
 	return ret;
 }

 static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
 					uint16_t partition, uint32_t offset)
 {
 	struct super_block *sb = inode->i_sb;
 	struct udf_part_map *map;
 	struct kernel_lb_addr eloc;
 	uint32_t elen;
 	sector_t ext_offset;
 	struct extent_position epos = {};
 	uint32_t phyblock;

 	if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
 						(EXT_RECORDED_ALLOCATED >> 30))
 		phyblock = 0xFFFFFFFF;
 	else {
 		map = &UDF_SB(sb)->s_partmaps[partition];
 		/* map to sparable/physical partition desc */
 		phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
 			map->s_type_specific.s_metadata.s_phys_partition_ref,
 			ext_offset + offset);
 	}

 	brelse(epos.bh);
 	return phyblock;
 }

 uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
 				uint16_t partition, uint32_t offset)
 {
 	struct udf_sb_info *sbi = UDF_SB(sb);
 	struct udf_part_map *map;
 	struct udf_meta_data *mdata;
 	uint32_t retblk;
 	struct inode *inode;

 	udf_debug("READING from METADATA\n");

 	map = &sbi->s_partmaps[partition];
 	mdata = &map->s_type_specific.s_metadata;
 	inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;

 	if (!inode)
 		return 0xFFFFFFFF;

 	retblk = udf_try_read_meta(inode, block, partition, offset);
 	if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
 		udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
 		if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
 			mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
 				mdata->s_mirror_file_loc,
 				mdata->s_phys_partition_ref);
 			if (IS_ERR(mdata->s_mirror_fe))
 				mdata->s_mirror_fe = NULL;
 			mdata->s_flags |= MF_MIRROR_FE_LOADED;
 		}

 		inode = mdata->s_mirror_fe;
 		if (!inode)
 			return 0xFFFFFFFF;
 		retblk = udf_try_read_meta(inode, block, partition, offset);
 	}

 	return retblk;
 }
	/*
	* partition.c
	*
	* PURPOSE
	* Partition handling routines for the OSTA-UDF(tm) filesystem.
	*
	* COPYRIGHT
	* This file is distributed under the terms of the GNU General Public
	* License (GPL). Copies of the GPL can be obtained from:
	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	* Each contributing author retains all rights to their own work.
	*
	* (C) 1998-2001 Ben Fennema
	*
	* HISTORY
	*
	* 12/06/98 blf Created file.
	*
	*/

	#include "udfdecl.h"
	#include "udf_sb.h"
	#include "udf_i.h"

	#include <linux/fs.h>
	#include <linux/string.h>
	#include <linux/mutex.h>

	uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
	uint16_t partition, uint32_t offset)
	{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map;
	if (partition >= sbi->s_partitions) {
	udf_debug("block=%u, partition=%u, offset=%u: invalid partition\n",
	block, partition, offset);
	return 0xFFFFFFFF;
	}
	map = &sbi->s_partmaps[partition];
	if (map->s_partition_func)
	return map->s_partition_func(sb, block, partition, offset);
	else
	return map->s_partition_root + block + offset;
	}

	uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
	uint16_t partition, uint32_t offset)
	{
	struct buffer_head *bh = NULL;
	uint32_t newblock;
	uint32_t index;
	uint32_t loc;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map;
	struct udf_virtual_data *vdata;
	struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);

	map = &sbi->s_partmaps[partition];
	vdata = &map->s_type_specific.s_virtual;

	if (block > vdata->s_num_entries) {
	udf_debug("Trying to access block beyond end of VAT (%u max %u)\n",
	block, vdata->s_num_entries);
	return 0xFFFFFFFF;
	}

	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
	loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
	vdata->s_start_offset))[block]);
	goto translate;
	}
	index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
	if (block >= index) {
	block -= index;
	newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
	index = block % (sb->s_blocksize / sizeof(uint32_t));
	} else {
	newblock = 0;
	index = vdata->s_start_offset / sizeof(uint32_t) + block;
	}

	loc = udf_block_map(sbi->s_vat_inode, newblock);

	bh = sb_bread(sb, loc);
	if (!bh) {
	udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u) VAT: %u[%u]\n",
	sb, block, partition, loc, index);
	return 0xFFFFFFFF;
	}

	loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);

	brelse(bh);

	translate:
	if (iinfo->i_location.partitionReferenceNum == partition) {
	udf_debug("recursive call to udf_get_pblock!\n");
	return 0xFFFFFFFF;
	}

	return udf_get_pblock(sb, loc,
	iinfo->i_location.partitionReferenceNum,
	offset);
	}

	inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
	uint16_t partition, uint32_t offset)
	{
	return udf_get_pblock_virt15(sb, block, partition, offset);
	}

	uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
	uint16_t partition, uint32_t offset)
	{
	int i;
	struct sparingTable *st = NULL;
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map;
	uint32_t packet;
	struct udf_sparing_data *sdata;

	map = &sbi->s_partmaps[partition];
	sdata = &map->s_type_specific.s_sparing;
	packet = (block + offset) & ~(sdata->s_packet_len - 1);

	for (i = 0; i < 4; i++) {
	if (sdata->s_spar_map[i] != NULL) {
	st = (struct sparingTable *)
	sdata->s_spar_map[i]->b_data;
	break;
	}
	}

	if (st) {
	for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
	struct sparingEntry *entry = &st->mapEntry[i];
	u32 origLoc = le32_to_cpu(entry->origLocation);
	if (origLoc >= 0xFFFFFFF0)
	break;
	else if (origLoc == packet)
	return le32_to_cpu(entry->mappedLocation) +
	((block + offset) &
	(sdata->s_packet_len - 1));
	else if (origLoc > packet)
	break;
	}
	}

	return map->s_partition_root + block + offset;
	}

	int udf_relocate_blocks(struct super_block sb, long old_block, long new_block)
	{
	struct udf_sparing_data *sdata;
	struct sparingTable *st = NULL;
	struct sparingEntry mapEntry;
	uint32_t packet;
	int i, j, k, l;
	struct udf_sb_info *sbi = UDF_SB(sb);
	u16 reallocationTableLen;
	struct buffer_head *bh;
	int ret = 0;

	mutex_lock(&sbi->s_alloc_mutex);
	for (i = 0; i < sbi->s_partitions; i++) {
	struct udf_part_map *map = &sbi->s_partmaps[i];
	if (old_block > map->s_partition_root &&
	old_block < map->s_partition_root + map->s_partition_len) {
	sdata = &map->s_type_specific.s_sparing;
	packet = (old_block - map->s_partition_root) &
	~(sdata->s_packet_len - 1);

	for (j = 0; j < 4; j++)
	if (sdata->s_spar_map[j] != NULL) {
	st = (struct sparingTable *)
	sdata->s_spar_map[j]->b_data;
	break;
	}

	if (!st) {
	ret = 1;
	goto out;
	}

	reallocationTableLen =
	le16_to_cpu(st->reallocationTableLen);
	for (k = 0; k < reallocationTableLen; k++) {
	struct sparingEntry *entry = &st->mapEntry[k];
	u32 origLoc = le32_to_cpu(entry->origLocation);

	if (origLoc == 0xFFFFFFFF) {
	for (; j < 4; j++) {
	int len;
	bh = sdata->s_spar_map[j];
	if (!bh)
	continue;

	st = (struct sparingTable *)
	bh->b_data;
	entry->origLocation =
	cpu_to_le32(packet);
	len =
	sizeof(struct sparingTable) +
	reallocationTableLen *
	sizeof(struct sparingEntry);
	udf_update_tag((char *)st, len);
	mark_buffer_dirty(bh);
	}
	*new_block = le32_to_cpu(
	entry->mappedLocation) +
	((old_block -
	map->s_partition_root) &
	(sdata->s_packet_len - 1));
	ret = 0;
	goto out;
	} else if (origLoc == packet) {
	*new_block = le32_to_cpu(
	entry->mappedLocation) +
	((old_block -
	map->s_partition_root) &
	(sdata->s_packet_len - 1));
	ret = 0;
	goto out;
	} else if (origLoc > packet)
	break;
	}

	for (l = k; l < reallocationTableLen; l++) {
	struct sparingEntry *entry = &st->mapEntry[l];
	u32 origLoc = le32_to_cpu(entry->origLocation);

	if (origLoc != 0xFFFFFFFF)
	continue;

	for (; j < 4; j++) {
	bh = sdata->s_spar_map[j];
	if (!bh)
	continue;

	st = (struct sparingTable *)bh->b_data;
	mapEntry = st->mapEntry[l];
	mapEntry.origLocation =
	cpu_to_le32(packet);
	memmove(&st->mapEntry[k + 1],
	&st->mapEntry[k],
	(l - k) *
	sizeof(struct sparingEntry));
	st->mapEntry[k] = mapEntry;
	udf_update_tag((char *)st,
	sizeof(struct sparingTable) +
	reallocationTableLen *
	sizeof(struct sparingEntry));
	mark_buffer_dirty(bh);
	}
	*new_block =
	le32_to_cpu(
	st->mapEntry[k].mappedLocation) +
	((old_block - map->s_partition_root) &
	(sdata->s_packet_len - 1));
	ret = 0;
	goto out;
	}

	ret = 1;
	goto out;
	} /* if old_block */
	}

	if (i == sbi->s_partitions) {
	/* outside of partitions */
	/* for now, fail =) */
	ret = 1;
	}

	out:
	mutex_unlock(&sbi->s_alloc_mutex);
	return ret;
	}

	static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
	uint16_t partition, uint32_t offset)
	{
	struct super_block *sb = inode->i_sb;
	struct udf_part_map *map;
	struct kernel_lb_addr eloc;
	uint32_t elen;
	sector_t ext_offset;
	struct extent_position epos = {};
	uint32_t phyblock;

	if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
	(EXT_RECORDED_ALLOCATED >> 30))
	phyblock = 0xFFFFFFFF;
	else {
	map = &UDF_SB(sb)->s_partmaps[partition];
	/* map to sparable/physical partition desc */
	phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
	map->s_type_specific.s_metadata.s_phys_partition_ref,
	ext_offset + offset);
	}

	brelse(epos.bh);
	return phyblock;
	}

	uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
	uint16_t partition, uint32_t offset)
	{
	struct udf_sb_info *sbi = UDF_SB(sb);
	struct udf_part_map *map;
	struct udf_meta_data *mdata;
	uint32_t retblk;
	struct inode *inode;

	udf_debug("READING from METADATA\n");

	map = &sbi->s_partmaps[partition];
	mdata = &map->s_type_specific.s_metadata;
	inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;

	if (!inode)
	return 0xFFFFFFFF;

	retblk = udf_try_read_meta(inode, block, partition, offset);
	if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
	udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
	if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
	mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
	mdata->s_mirror_file_loc,
	mdata->s_phys_partition_ref);
	if (IS_ERR(mdata->s_mirror_fe))
	mdata->s_mirror_fe = NULL;
	mdata->s_flags \|= MF_MIRROR_FE_LOADED;
	}

	inode = mdata->s_mirror_fe;
	if (!inode)
	return 0xFFFFFFFF;
	retblk = udf_try_read_meta(inode, block, partition, offset);
	}

	return retblk;
	}