[linux.git] / fs / udf / partition.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * partition.c
 *
 * PURPOSE
 *      Partition handling routines for the OSTA-UDF(tm) filesystem.
 *
 * COPYRIGHT
 *  (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);
	int err;

	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_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;
	}

	bh = udf_bread(sbi->s_vat_inode, newblock, 0, &err);
	if (!bh) {
		udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u)\n",
			  sb, block, partition);
		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
5ce34554	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* partition.c
	4	*
	5	* PURPOSE
	6	* Partition handling routines for the OSTA-UDF(tm) filesystem.
	7	*
1da177e4	8	* COPYRIGHT
1da177e4 LT	9	* (C) 1998-2001 Ben Fennema
	10	*
	11	* HISTORY
	12	*
28de7948	13	* 12/06/98 blf Created file.
1da177e4 LT	14	*
	15	*/
	16
	17	#include "udfdecl.h"
	18	#include "udf_sb.h"
	19	#include "udf_i.h"
	20
	21	#include <linux/fs.h>
	22	#include <linux/string.h>
7db09be6	23	#include <linux/mutex.h>
1da177e4	24
22ba0317 AB	25	uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
22ba0317 AB	26	uint16_t partition, uint32_t offset)
1da177e4	27	{
6c79e987 MS	28	struct udf_sb_info *sbi = UDF_SB(sb);
	29	struct udf_part_map *map;
	30	if (partition >= sbi->s_partitions) {
fcbf7637	31	udf_debug("block=%u, partition=%u, offset=%u: invalid partition\n",
a983f368	32	block, partition, offset);
1da177e4 LT	33	return 0xFFFFFFFF;
1da177e4 LT	34	}
6c79e987 MS	35	map = &sbi->s_partmaps[partition];
	36	if (map->s_partition_func)
	37	return map->s_partition_func(sb, block, partition, offset);
1da177e4	38	else
6c79e987	39	return map->s_partition_root + block + offset;
1da177e4 LT	40	}
1da177e4 LT	41
28de7948	42	uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
cb00ea35	43	uint16_t partition, uint32_t offset)
1da177e4 LT	44	{
	45	struct buffer_head *bh = NULL;
	46	uint32_t newblock;
	47	uint32_t index;
	48	uint32_t loc;
6c79e987 MS	49	struct udf_sb_info *sbi = UDF_SB(sb);
6c79e987 MS	50	struct udf_part_map *map;
4b11111a	51	struct udf_virtual_data *vdata;
fa5e0815	52	struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
4215db46	53	int err;
1da177e4	54
6c79e987	55	map = &sbi->s_partmaps[partition];
4b11111a	56	vdata = &map->s_type_specific.s_virtual;
1da177e4	57
4b11111a	58	if (block > vdata->s_num_entries) {
fcbf7637	59	udf_debug("Trying to access block beyond end of VAT (%u max %u)\n",
a983f368	60	block, vdata->s_num_entries);
1da177e4 LT	61	return 0xFFFFFFFF;
	62	}
	63
fa5e0815	64	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
382a2287	65	loc = le32_to_cpu(((__le32 *)(iinfo->i_data +
47c9358a	66	vdata->s_start_offset))[block]);
fa5e0815 JK	67	goto translate;
	68	}
	69	index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
cb00ea35	70	if (block >= index) {
1da177e4 LT	71	block -= index;
	72	newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
	73	index = block % (sb->s_blocksize / sizeof(uint32_t));
cb00ea35	74	} else {
1da177e4	75	newblock = 0;
4b11111a	76	index = vdata->s_start_offset / sizeof(uint32_t) + block;
1da177e4 LT	77	}
1da177e4 LT	78
4215db46	79	bh = udf_bread(sbi->s_vat_inode, newblock, 0, &err);
4b11111a	80	if (!bh) {
f8d0dd0b TR	81	udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u)\n",
f8d0dd0b TR	82	sb, block, partition);
1da177e4 LT	83	return 0xFFFFFFFF;
	84	}
	85
28de7948	86	loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
1da177e4	87
3bf25cb4	88	brelse(bh);
1da177e4	89
fa5e0815	90	translate:
48d6d8ff	91	if (iinfo->i_location.partitionReferenceNum == partition) {
1da177e4 LT	92	udf_debug("recursive call to udf_get_pblock!\n");
	93	return 0xFFFFFFFF;
	94	}
	95
cb00ea35	96	return udf_get_pblock(sb, loc,
48d6d8ff	97	iinfo->i_location.partitionReferenceNum,
28de7948	98	offset);
1da177e4 LT	99	}
1da177e4 LT	100
4b11111a	101	inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
cb00ea35	102	uint16_t partition, uint32_t offset)
1da177e4 LT	103	{
	104	return udf_get_pblock_virt15(sb, block, partition, offset);
	105	}
	106
6c79e987	107	uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
cb00ea35	108	uint16_t partition, uint32_t offset)
1da177e4 LT	109	{
	110	int i;
	111	struct sparingTable *st = NULL;
6c79e987 MS	112	struct udf_sb_info *sbi = UDF_SB(sb);
	113	struct udf_part_map *map;
	114	uint32_t packet;
4b11111a	115	struct udf_sparing_data *sdata;
6c79e987 MS	116
6c79e987 MS	117	map = &sbi->s_partmaps[partition];
4b11111a MS	118	sdata = &map->s_type_specific.s_sparing;
4b11111a MS	119	packet = (block + offset) & ~(sdata->s_packet_len - 1);
1da177e4	120
cb00ea35	121	for (i = 0; i < 4; i++) {
4b11111a MS	122	if (sdata->s_spar_map[i] != NULL) {
	123	st = (struct sparingTable *)
	124	sdata->s_spar_map[i]->b_data;
1da177e4 LT	125	break;
	126	}
	127	}
	128
cb00ea35 CG	129	if (st) {
cb00ea35 CG	130	for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
4b11111a MS	131	struct sparingEntry *entry = &st->mapEntry[i];
	132	u32 origLoc = le32_to_cpu(entry->origLocation);
	133	if (origLoc >= 0xFFFFFFF0)
1da177e4	134	break;
4b11111a MS	135	else if (origLoc == packet)
	136	return le32_to_cpu(entry->mappedLocation) +
	137	((block + offset) &
	138	(sdata->s_packet_len - 1));
	139	else if (origLoc > packet)
1da177e4 LT	140	break;
	141	}
	142	}
28de7948	143
6c79e987	144	return map->s_partition_root + block + offset;
1da177e4 LT	145	}
	146
	147	int udf_relocate_blocks(struct super_block sb, long old_block, long new_block)
	148	{
	149	struct udf_sparing_data *sdata;
	150	struct sparingTable *st = NULL;
	151	struct sparingEntry mapEntry;
	152	uint32_t packet;
	153	int i, j, k, l;
6c79e987	154	struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a MS	155	u16 reallocationTableLen;
4b11111a MS	156	struct buffer_head *bh;
7db09be6	157	int ret = 0;
1da177e4	158
7db09be6	159	mutex_lock(&sbi->s_alloc_mutex);
6c79e987 MS	160	for (i = 0; i < sbi->s_partitions; i++) {
	161	struct udf_part_map *map = &sbi->s_partmaps[i];
	162	if (old_block > map->s_partition_root &&
	163	old_block < map->s_partition_root + map->s_partition_len) {
	164	sdata = &map->s_type_specific.s_sparing;
4b11111a MS	165	packet = (old_block - map->s_partition_root) &
4b11111a MS	166	~(sdata->s_packet_len - 1);
cb00ea35	167
4b11111a MS	168	for (j = 0; j < 4; j++)
	169	if (sdata->s_spar_map[j] != NULL) {
	170	st = (struct sparingTable *)
	171	sdata->s_spar_map[j]->b_data;
1da177e4 LT	172	break;
1da177e4 LT	173	}
1da177e4	174
7db09be6 AIB	175	if (!st) {
	176	ret = 1;
	177	goto out;
	178	}
1da177e4	179
4b11111a MS	180	reallocationTableLen =
	181	le16_to_cpu(st->reallocationTableLen);
	182	for (k = 0; k < reallocationTableLen; k++) {
	183	struct sparingEntry *entry = &st->mapEntry[k];
	184	u32 origLoc = le32_to_cpu(entry->origLocation);
	185
	186	if (origLoc == 0xFFFFFFFF) {
cb00ea35	187	for (; j < 4; j++) {
4b11111a MS	188	int len;
	189	bh = sdata->s_spar_map[j];
	190	if (!bh)
	191	continue;
	192
	193	st = (struct sparingTable *)
	194	bh->b_data;
	195	entry->origLocation =
	196	cpu_to_le32(packet);
	197	len =
	198	sizeof(struct sparingTable) +
	199	reallocationTableLen *
	200	sizeof(struct sparingEntry);
	201	udf_update_tag((char *)st, len);
	202	mark_buffer_dirty(bh);
1da177e4	203	}
4b11111a MS	204	*new_block = le32_to_cpu(
	205	entry->mappedLocation) +
	206	((old_block -
	207	map->s_partition_root) &
	208	(sdata->s_packet_len - 1));
7db09be6 AIB	209	ret = 0;
7db09be6 AIB	210	goto out;
4b11111a MS	211	} else if (origLoc == packet) {
	212	*new_block = le32_to_cpu(
	213	entry->mappedLocation) +
	214	((old_block -
	215	map->s_partition_root) &
	216	(sdata->s_packet_len - 1));
7db09be6 AIB	217	ret = 0;
7db09be6 AIB	218	goto out;
4b11111a	219	} else if (origLoc > packet)
1da177e4 LT	220	break;
1da177e4 LT	221	}
28de7948	222
4b11111a MS	223	for (l = k; l < reallocationTableLen; l++) {
	224	struct sparingEntry *entry = &st->mapEntry[l];
	225	u32 origLoc = le32_to_cpu(entry->origLocation);
	226
	227	if (origLoc != 0xFFFFFFFF)
	228	continue;
	229
	230	for (; j < 4; j++) {
	231	bh = sdata->s_spar_map[j];
	232	if (!bh)
	233	continue;
	234
	235	st = (struct sparingTable *)bh->b_data;
	236	mapEntry = st->mapEntry[l];
	237	mapEntry.origLocation =
	238	cpu_to_le32(packet);
	239	memmove(&st->mapEntry[k + 1],
	240	&st->mapEntry[k],
	241	(l - k) *
	242	sizeof(struct sparingEntry));
	243	st->mapEntry[k] = mapEntry;
	244	udf_update_tag((char *)st,
	245	sizeof(struct sparingTable) +
	246	reallocationTableLen *
	247	sizeof(struct sparingEntry));
	248	mark_buffer_dirty(bh);
1da177e4	249	}
4b11111a MS	250	*new_block =
	251	le32_to_cpu(
	252	st->mapEntry[k].mappedLocation) +
	253	((old_block - map->s_partition_root) &
	254	(sdata->s_packet_len - 1));
7db09be6 AIB	255	ret = 0;
7db09be6 AIB	256	goto out;
1da177e4	257	}
28de7948	258
7db09be6 AIB	259	ret = 1;
7db09be6 AIB	260	goto out;
28de7948	261	} /* if old_block */
1da177e4	262	}
28de7948	263
6c79e987	264	if (i == sbi->s_partitions) {
1da177e4 LT	265	/* outside of partitions */
1da177e4 LT	266	/* for now, fail =) */
7db09be6	267	ret = 1;
1da177e4 LT	268	}
1da177e4 LT	269
7db09be6 AIB	270	out:
	271	mutex_unlock(&sbi->s_alloc_mutex);
	272	return ret;
1da177e4	273	}
bfb257a5 JK	274
	275	static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
	276	uint16_t partition, uint32_t offset)
	277	{
	278	struct super_block *sb = inode->i_sb;
	279	struct udf_part_map *map;
5ca4e4be	280	struct kernel_lb_addr eloc;
bfb257a5 JK	281	uint32_t elen;
	282	sector_t ext_offset;
	283	struct extent_position epos = {};
	284	uint32_t phyblock;
	285
	286	if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
	287	(EXT_RECORDED_ALLOCATED >> 30))
	288	phyblock = 0xFFFFFFFF;
	289	else {
	290	map = &UDF_SB(sb)->s_partmaps[partition];
	291	/* map to sparable/physical partition desc */
	292	phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
7888824b AT	293	map->s_type_specific.s_metadata.s_phys_partition_ref,
7888824b AT	294	ext_offset + offset);
bfb257a5 JK	295	}
	296
	297	brelse(epos.bh);
	298	return phyblock;
	299	}
	300
	301	uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
	302	uint16_t partition, uint32_t offset)
	303	{
	304	struct udf_sb_info *sbi = UDF_SB(sb);
	305	struct udf_part_map *map;
	306	struct udf_meta_data *mdata;
	307	uint32_t retblk;
	308	struct inode *inode;
	309
	310	udf_debug("READING from METADATA\n");
	311
	312	map = &sbi->s_partmaps[partition];
	313	mdata = &map->s_type_specific.s_metadata;
	314	inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
	315
585d7000 AT	316	if (!inode)
	317	return 0xFFFFFFFF;
	318
bfb257a5	319	retblk = udf_try_read_meta(inode, block, partition, offset);
3080a74e	320	if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
a40ecd7b	321	udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
ed47a7d0	322	if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
3080a74e	323	mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
7888824b AT	324	mdata->s_mirror_file_loc,
7888824b AT	325	mdata->s_phys_partition_ref);
3743a03e AT	326	if (IS_ERR(mdata->s_mirror_fe))
3743a03e AT	327	mdata->s_mirror_fe = NULL;
ed47a7d0	328	mdata->s_flags \|= MF_MIRROR_FE_LOADED;
3080a74e NJ	329	}
3080a74e NJ	330
bfb257a5 JK	331	inode = mdata->s_mirror_fe;
	332	if (!inode)
	333	return 0xFFFFFFFF;
	334	retblk = udf_try_read_meta(inode, block, partition, offset);
	335	}
	336
	337	return retblk;
	338	}