[mirror_ubuntu-artful-kernel.git] / fs / udf / partition.c

/*
 * 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=%d, partition=%d, offset=%d: 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 (%d max %d)\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,%d,%d) VAT: %d[%d]\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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* partition.c
	3	*
	4	* PURPOSE
	5	* Partition handling routines for the OSTA-UDF(tm) filesystem.
	6	*
1da177e4 LT	7	* COPYRIGHT
	8	* This file is distributed under the terms of the GNU General Public
	9	* License (GPL). Copies of the GPL can be obtained from:
	10	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	11	* Each contributing author retains all rights to their own work.
	12	*
	13	* (C) 1998-2001 Ben Fennema
	14	*
	15	* HISTORY
	16	*
28de7948	17	* 12/06/98 blf Created file.
1da177e4 LT	18	*
	19	*/
	20
	21	#include "udfdecl.h"
	22	#include "udf_sb.h"
	23	#include "udf_i.h"
	24
	25	#include <linux/fs.h>
	26	#include <linux/string.h>
7db09be6	27	#include <linux/mutex.h>
1da177e4	28
22ba0317 AB	29	uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
22ba0317 AB	30	uint16_t partition, uint32_t offset)
1da177e4	31	{
6c79e987 MS	32	struct udf_sb_info *sbi = UDF_SB(sb);
	33	struct udf_part_map *map;
	34	if (partition >= sbi->s_partitions) {
a983f368 JP	35	udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n",
a983f368 JP	36	block, partition, offset);
1da177e4 LT	37	return 0xFFFFFFFF;
1da177e4 LT	38	}
6c79e987 MS	39	map = &sbi->s_partmaps[partition];
	40	if (map->s_partition_func)
	41	return map->s_partition_func(sb, block, partition, offset);
1da177e4	42	else
6c79e987	43	return map->s_partition_root + block + offset;
1da177e4 LT	44	}
1da177e4 LT	45
28de7948	46	uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
cb00ea35	47	uint16_t partition, uint32_t offset)
1da177e4 LT	48	{
	49	struct buffer_head *bh = NULL;
	50	uint32_t newblock;
	51	uint32_t index;
	52	uint32_t loc;
6c79e987 MS	53	struct udf_sb_info *sbi = UDF_SB(sb);
6c79e987 MS	54	struct udf_part_map *map;
4b11111a	55	struct udf_virtual_data *vdata;
fa5e0815	56	struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
1da177e4	57
6c79e987	58	map = &sbi->s_partmaps[partition];
4b11111a	59	vdata = &map->s_type_specific.s_virtual;
1da177e4	60
4b11111a	61	if (block > vdata->s_num_entries) {
a983f368 JP	62	udf_debug("Trying to access block beyond end of VAT (%d max %d)\n",
a983f368 JP	63	block, vdata->s_num_entries);
1da177e4 LT	64	return 0xFFFFFFFF;
	65	}
	66
fa5e0815	67	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
47c9358a SM	68	loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
47c9358a SM	69	vdata->s_start_offset))[block]);
fa5e0815 JK	70	goto translate;
	71	}
	72	index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
cb00ea35	73	if (block >= index) {
1da177e4 LT	74	block -= index;
	75	newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
	76	index = block % (sb->s_blocksize / sizeof(uint32_t));
cb00ea35	77	} else {
1da177e4	78	newblock = 0;
4b11111a	79	index = vdata->s_start_offset / sizeof(uint32_t) + block;
1da177e4 LT	80	}
1da177e4 LT	81
6c79e987	82	loc = udf_block_map(sbi->s_vat_inode, newblock);
1da177e4	83
4b11111a MS	84	bh = sb_bread(sb, loc);
4b11111a MS	85	if (!bh) {
1da177e4	86	udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
cb00ea35	87	sb, block, partition, loc, index);
1da177e4 LT	88	return 0xFFFFFFFF;
	89	}
	90
28de7948	91	loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
1da177e4	92
3bf25cb4	93	brelse(bh);
1da177e4	94
fa5e0815	95	translate:
48d6d8ff	96	if (iinfo->i_location.partitionReferenceNum == partition) {
1da177e4 LT	97	udf_debug("recursive call to udf_get_pblock!\n");
	98	return 0xFFFFFFFF;
	99	}
	100
cb00ea35	101	return udf_get_pblock(sb, loc,
48d6d8ff	102	iinfo->i_location.partitionReferenceNum,
28de7948	103	offset);
1da177e4 LT	104	}
1da177e4 LT	105
4b11111a	106	inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
cb00ea35	107	uint16_t partition, uint32_t offset)
1da177e4 LT	108	{
	109	return udf_get_pblock_virt15(sb, block, partition, offset);
	110	}
	111
6c79e987	112	uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
cb00ea35	113	uint16_t partition, uint32_t offset)
1da177e4 LT	114	{
	115	int i;
	116	struct sparingTable *st = NULL;
6c79e987 MS	117	struct udf_sb_info *sbi = UDF_SB(sb);
	118	struct udf_part_map *map;
	119	uint32_t packet;
4b11111a	120	struct udf_sparing_data *sdata;
6c79e987 MS	121
6c79e987 MS	122	map = &sbi->s_partmaps[partition];
4b11111a MS	123	sdata = &map->s_type_specific.s_sparing;
4b11111a MS	124	packet = (block + offset) & ~(sdata->s_packet_len - 1);
1da177e4	125
cb00ea35	126	for (i = 0; i < 4; i++) {
4b11111a MS	127	if (sdata->s_spar_map[i] != NULL) {
	128	st = (struct sparingTable *)
	129	sdata->s_spar_map[i]->b_data;
1da177e4 LT	130	break;
	131	}
	132	}
	133
cb00ea35 CG	134	if (st) {
cb00ea35 CG	135	for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
4b11111a MS	136	struct sparingEntry *entry = &st->mapEntry[i];
	137	u32 origLoc = le32_to_cpu(entry->origLocation);
	138	if (origLoc >= 0xFFFFFFF0)
1da177e4	139	break;
4b11111a MS	140	else if (origLoc == packet)
	141	return le32_to_cpu(entry->mappedLocation) +
	142	((block + offset) &
	143	(sdata->s_packet_len - 1));
	144	else if (origLoc > packet)
1da177e4 LT	145	break;
	146	}
	147	}
28de7948	148
6c79e987	149	return map->s_partition_root + block + offset;
1da177e4 LT	150	}
	151
	152	int udf_relocate_blocks(struct super_block sb, long old_block, long new_block)
	153	{
	154	struct udf_sparing_data *sdata;
	155	struct sparingTable *st = NULL;
	156	struct sparingEntry mapEntry;
	157	uint32_t packet;
	158	int i, j, k, l;
6c79e987	159	struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a MS	160	u16 reallocationTableLen;
4b11111a MS	161	struct buffer_head *bh;
7db09be6	162	int ret = 0;
1da177e4	163
7db09be6	164	mutex_lock(&sbi->s_alloc_mutex);
6c79e987 MS	165	for (i = 0; i < sbi->s_partitions; i++) {
	166	struct udf_part_map *map = &sbi->s_partmaps[i];
	167	if (old_block > map->s_partition_root &&
	168	old_block < map->s_partition_root + map->s_partition_len) {
	169	sdata = &map->s_type_specific.s_sparing;
4b11111a MS	170	packet = (old_block - map->s_partition_root) &
4b11111a MS	171	~(sdata->s_packet_len - 1);
cb00ea35	172
4b11111a MS	173	for (j = 0; j < 4; j++)
	174	if (sdata->s_spar_map[j] != NULL) {
	175	st = (struct sparingTable *)
	176	sdata->s_spar_map[j]->b_data;
1da177e4 LT	177	break;
1da177e4 LT	178	}
1da177e4	179
7db09be6 AIB	180	if (!st) {
	181	ret = 1;
	182	goto out;
	183	}
1da177e4	184
4b11111a MS	185	reallocationTableLen =
	186	le16_to_cpu(st->reallocationTableLen);
	187	for (k = 0; k < reallocationTableLen; k++) {
	188	struct sparingEntry *entry = &st->mapEntry[k];
	189	u32 origLoc = le32_to_cpu(entry->origLocation);
	190
	191	if (origLoc == 0xFFFFFFFF) {
cb00ea35	192	for (; j < 4; j++) {
4b11111a MS	193	int len;
	194	bh = sdata->s_spar_map[j];
	195	if (!bh)
	196	continue;
	197
	198	st = (struct sparingTable *)
	199	bh->b_data;
	200	entry->origLocation =
	201	cpu_to_le32(packet);
	202	len =
	203	sizeof(struct sparingTable) +
	204	reallocationTableLen *
	205	sizeof(struct sparingEntry);
	206	udf_update_tag((char *)st, len);
	207	mark_buffer_dirty(bh);
1da177e4	208	}
4b11111a MS	209	*new_block = le32_to_cpu(
	210	entry->mappedLocation) +
	211	((old_block -
	212	map->s_partition_root) &
	213	(sdata->s_packet_len - 1));
7db09be6 AIB	214	ret = 0;
7db09be6 AIB	215	goto out;
4b11111a MS	216	} else if (origLoc == packet) {
	217	*new_block = le32_to_cpu(
	218	entry->mappedLocation) +
	219	((old_block -
	220	map->s_partition_root) &
	221	(sdata->s_packet_len - 1));
7db09be6 AIB	222	ret = 0;
7db09be6 AIB	223	goto out;
4b11111a	224	} else if (origLoc > packet)
1da177e4 LT	225	break;
1da177e4 LT	226	}
28de7948	227
4b11111a MS	228	for (l = k; l < reallocationTableLen; l++) {
	229	struct sparingEntry *entry = &st->mapEntry[l];
	230	u32 origLoc = le32_to_cpu(entry->origLocation);
	231
	232	if (origLoc != 0xFFFFFFFF)
	233	continue;
	234
	235	for (; j < 4; j++) {
	236	bh = sdata->s_spar_map[j];
	237	if (!bh)
	238	continue;
	239
	240	st = (struct sparingTable *)bh->b_data;
	241	mapEntry = st->mapEntry[l];
	242	mapEntry.origLocation =
	243	cpu_to_le32(packet);
	244	memmove(&st->mapEntry[k + 1],
	245	&st->mapEntry[k],
	246	(l - k) *
	247	sizeof(struct sparingEntry));
	248	st->mapEntry[k] = mapEntry;
	249	udf_update_tag((char *)st,
	250	sizeof(struct sparingTable) +
	251	reallocationTableLen *
	252	sizeof(struct sparingEntry));
	253	mark_buffer_dirty(bh);
1da177e4	254	}
4b11111a MS	255	*new_block =
	256	le32_to_cpu(
	257	st->mapEntry[k].mappedLocation) +
	258	((old_block - map->s_partition_root) &
	259	(sdata->s_packet_len - 1));
7db09be6 AIB	260	ret = 0;
7db09be6 AIB	261	goto out;
1da177e4	262	}
28de7948	263
7db09be6 AIB	264	ret = 1;
7db09be6 AIB	265	goto out;
28de7948	266	} /* if old_block */
1da177e4	267	}
28de7948	268
6c79e987	269	if (i == sbi->s_partitions) {
1da177e4 LT	270	/* outside of partitions */
1da177e4 LT	271	/* for now, fail =) */
7db09be6	272	ret = 1;
1da177e4 LT	273	}
1da177e4 LT	274
7db09be6 AIB	275	out:
	276	mutex_unlock(&sbi->s_alloc_mutex);
	277	return ret;
1da177e4	278	}
bfb257a5 JK	279
	280	static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
	281	uint16_t partition, uint32_t offset)
	282	{
	283	struct super_block *sb = inode->i_sb;
	284	struct udf_part_map *map;
5ca4e4be	285	struct kernel_lb_addr eloc;
bfb257a5 JK	286	uint32_t elen;
	287	sector_t ext_offset;
	288	struct extent_position epos = {};
	289	uint32_t phyblock;
	290
	291	if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
	292	(EXT_RECORDED_ALLOCATED >> 30))
	293	phyblock = 0xFFFFFFFF;
	294	else {
	295	map = &UDF_SB(sb)->s_partmaps[partition];
	296	/* map to sparable/physical partition desc */
	297	phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
7888824b AT	298	map->s_type_specific.s_metadata.s_phys_partition_ref,
7888824b AT	299	ext_offset + offset);
bfb257a5 JK	300	}
	301
	302	brelse(epos.bh);
	303	return phyblock;
	304	}
	305
	306	uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
	307	uint16_t partition, uint32_t offset)
	308	{
	309	struct udf_sb_info *sbi = UDF_SB(sb);
	310	struct udf_part_map *map;
	311	struct udf_meta_data *mdata;
	312	uint32_t retblk;
	313	struct inode *inode;
	314
	315	udf_debug("READING from METADATA\n");
	316
	317	map = &sbi->s_partmaps[partition];
	318	mdata = &map->s_type_specific.s_metadata;
	319	inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
	320
585d7000 AT	321	if (!inode)
	322	return 0xFFFFFFFF;
	323
bfb257a5	324	retblk = udf_try_read_meta(inode, block, partition, offset);
3080a74e	325	if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
a40ecd7b	326	udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
ed47a7d0	327	if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
3080a74e	328	mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
7888824b AT	329	mdata->s_mirror_file_loc,
7888824b AT	330	mdata->s_phys_partition_ref);
3743a03e AT	331	if (IS_ERR(mdata->s_mirror_fe))
3743a03e AT	332	mdata->s_mirror_fe = NULL;
ed47a7d0	333	mdata->s_flags \|= MF_MIRROR_FE_LOADED;
3080a74e NJ	334	}
3080a74e NJ	335
bfb257a5 JK	336	inode = mdata->s_mirror_fe;
	337	if (!inode)
	338	return 0xFFFFFFFF;
	339	retblk = udf_try_read_meta(inode, block, partition, offset);
	340	}
	341
	342	return retblk;
	343	}