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Commit | Line | Data |
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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> | |
27 | #include <linux/udf_fs.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/buffer_head.h> | |
30 | ||
cb00ea35 CG |
31 | inline uint32_t udf_get_pblock(struct super_block *sb, uint32_t block, |
32 | uint16_t partition, uint32_t offset) | |
1da177e4 | 33 | { |
cb00ea35 | 34 | if (partition >= UDF_SB_NUMPARTS(sb)) { |
28de7948 CG |
35 | udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n", |
36 | block, partition, offset); | |
1da177e4 LT |
37 | return 0xFFFFFFFF; |
38 | } | |
39 | if (UDF_SB_PARTFUNC(sb, partition)) | |
28de7948 | 40 | return UDF_SB_PARTFUNC(sb, partition)(sb, block, partition, offset); |
1da177e4 LT |
41 | else |
42 | return UDF_SB_PARTROOT(sb, partition) + block + offset; | |
43 | } | |
44 | ||
28de7948 | 45 | uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block, |
cb00ea35 | 46 | uint16_t partition, uint32_t offset) |
1da177e4 LT |
47 | { |
48 | struct buffer_head *bh = NULL; | |
49 | uint32_t newblock; | |
50 | uint32_t index; | |
51 | uint32_t loc; | |
52 | ||
28de7948 | 53 | index = (sb->s_blocksize - UDF_SB_TYPEVIRT(sb,partition).s_start_offset) / sizeof(uint32_t); |
1da177e4 | 54 | |
28de7948 CG |
55 | if (block > UDF_SB_TYPEVIRT(sb,partition).s_num_entries) { |
56 | udf_debug("Trying to access block beyond end of VAT (%d max %d)\n", | |
57 | block, UDF_SB_TYPEVIRT(sb,partition).s_num_entries); | |
1da177e4 LT |
58 | return 0xFFFFFFFF; |
59 | } | |
60 | ||
cb00ea35 | 61 | if (block >= index) { |
1da177e4 LT |
62 | block -= index; |
63 | newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t))); | |
64 | index = block % (sb->s_blocksize / sizeof(uint32_t)); | |
cb00ea35 | 65 | } else { |
1da177e4 | 66 | newblock = 0; |
28de7948 | 67 | index = UDF_SB_TYPEVIRT(sb,partition).s_start_offset / sizeof(uint32_t) + block; |
1da177e4 LT |
68 | } |
69 | ||
70 | loc = udf_block_map(UDF_SB_VAT(sb), newblock); | |
71 | ||
cb00ea35 | 72 | if (!(bh = sb_bread(sb, loc))) { |
1da177e4 | 73 | udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n", |
cb00ea35 | 74 | sb, block, partition, loc, index); |
1da177e4 LT |
75 | return 0xFFFFFFFF; |
76 | } | |
77 | ||
28de7948 | 78 | loc = le32_to_cpu(((__le32 *)bh->b_data)[index]); |
1da177e4 | 79 | |
3bf25cb4 | 80 | brelse(bh); |
1da177e4 | 81 | |
cb00ea35 | 82 | if (UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum == partition) { |
1da177e4 LT |
83 | udf_debug("recursive call to udf_get_pblock!\n"); |
84 | return 0xFFFFFFFF; | |
85 | } | |
86 | ||
cb00ea35 | 87 | return udf_get_pblock(sb, loc, |
28de7948 CG |
88 | UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum, |
89 | offset); | |
1da177e4 LT |
90 | } |
91 | ||
cb00ea35 CG |
92 | inline uint32_t udf_get_pblock_virt20(struct super_block * sb, uint32_t block, |
93 | uint16_t partition, uint32_t offset) | |
1da177e4 LT |
94 | { |
95 | return udf_get_pblock_virt15(sb, block, partition, offset); | |
96 | } | |
97 | ||
cb00ea35 CG |
98 | uint32_t udf_get_pblock_spar15(struct super_block * sb, uint32_t block, |
99 | uint16_t partition, uint32_t offset) | |
1da177e4 LT |
100 | { |
101 | int i; | |
102 | struct sparingTable *st = NULL; | |
28de7948 | 103 | uint32_t packet = (block + offset) & ~(UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1); |
1da177e4 | 104 | |
cb00ea35 | 105 | for (i = 0; i < 4; i++) { |
28de7948 CG |
106 | if (UDF_SB_TYPESPAR(sb,partition).s_spar_map[i] != NULL) { |
107 | st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,partition).s_spar_map[i]->b_data; | |
1da177e4 LT |
108 | break; |
109 | } | |
110 | } | |
111 | ||
cb00ea35 CG |
112 | if (st) { |
113 | for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) { | |
28de7948 | 114 | if (le32_to_cpu(st->mapEntry[i].origLocation) >= 0xFFFFFFF0) { |
1da177e4 | 115 | break; |
28de7948 CG |
116 | } else if (le32_to_cpu(st->mapEntry[i].origLocation) == packet) { |
117 | return le32_to_cpu(st->mapEntry[i].mappedLocation) + | |
118 | ((block + offset) & (UDF_SB_TYPESPAR(sb,partition).s_packet_len - 1)); | |
119 | } else if (le32_to_cpu(st->mapEntry[i].origLocation) > packet) { | |
1da177e4 | 120 | break; |
28de7948 | 121 | } |
1da177e4 LT |
122 | } |
123 | } | |
28de7948 CG |
124 | |
125 | return UDF_SB_PARTROOT(sb,partition) + block + offset; | |
1da177e4 LT |
126 | } |
127 | ||
128 | int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block) | |
129 | { | |
130 | struct udf_sparing_data *sdata; | |
131 | struct sparingTable *st = NULL; | |
132 | struct sparingEntry mapEntry; | |
133 | uint32_t packet; | |
134 | int i, j, k, l; | |
135 | ||
cb00ea35 | 136 | for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) { |
28de7948 CG |
137 | if (old_block > UDF_SB_PARTROOT(sb,i) && |
138 | old_block < UDF_SB_PARTROOT(sb,i) + UDF_SB_PARTLEN(sb,i)) { | |
139 | sdata = &UDF_SB_TYPESPAR(sb,i); | |
140 | packet = (old_block - UDF_SB_PARTROOT(sb,i)) & ~(sdata->s_packet_len - 1); | |
cb00ea35 CG |
141 | |
142 | for (j = 0; j < 4; j++) { | |
28de7948 CG |
143 | if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) { |
144 | st = (struct sparingTable *)sdata->s_spar_map[j]->b_data; | |
1da177e4 LT |
145 | break; |
146 | } | |
147 | } | |
148 | ||
149 | if (!st) | |
150 | return 1; | |
151 | ||
28de7948 CG |
152 | for (k = 0; k < le16_to_cpu(st->reallocationTableLen); k++) { |
153 | if (le32_to_cpu(st->mapEntry[k].origLocation) == 0xFFFFFFFF) { | |
cb00ea35 CG |
154 | for (; j < 4; j++) { |
155 | if (sdata->s_spar_map[j]) { | |
28de7948 CG |
156 | st = (struct sparingTable *)sdata->s_spar_map[j]->b_data; |
157 | st->mapEntry[k].origLocation = cpu_to_le32(packet); | |
158 | udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry)); | |
159 | mark_buffer_dirty(sdata->s_spar_map[j]); | |
1da177e4 LT |
160 | } |
161 | } | |
28de7948 CG |
162 | *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) + |
163 | ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1)); | |
1da177e4 | 164 | return 0; |
28de7948 CG |
165 | } else if (le32_to_cpu(st->mapEntry[k].origLocation) == packet) { |
166 | *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) + | |
167 | ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1)); | |
1da177e4 | 168 | return 0; |
28de7948 | 169 | } else if (le32_to_cpu(st->mapEntry[k].origLocation) > packet) { |
1da177e4 | 170 | break; |
28de7948 | 171 | } |
1da177e4 | 172 | } |
28de7948 CG |
173 | |
174 | for (l = k; l < le16_to_cpu(st->reallocationTableLen); l++) { | |
175 | if (le32_to_cpu(st->mapEntry[l].origLocation) == 0xFFFFFFFF) { | |
cb00ea35 CG |
176 | for (; j < 4; j++) { |
177 | if (sdata->s_spar_map[j]) { | |
28de7948 CG |
178 | st = (struct sparingTable *)sdata->s_spar_map[j]->b_data; |
179 | mapEntry = st->mapEntry[l]; | |
180 | mapEntry.origLocation = cpu_to_le32(packet); | |
181 | memmove(&st->mapEntry[k + 1], &st->mapEntry[k], (l - k) * sizeof(struct sparingEntry)); | |
182 | st->mapEntry[k] = mapEntry; | |
183 | udf_update_tag((char *)st, sizeof(struct sparingTable) + le16_to_cpu(st->reallocationTableLen) * sizeof(struct sparingEntry)); | |
184 | mark_buffer_dirty(sdata->s_spar_map[j]); | |
1da177e4 LT |
185 | } |
186 | } | |
28de7948 CG |
187 | *new_block = le32_to_cpu(st->mapEntry[k].mappedLocation) + |
188 | ((old_block - UDF_SB_PARTROOT(sb,i)) & (sdata->s_packet_len - 1)); | |
1da177e4 LT |
189 | return 0; |
190 | } | |
191 | } | |
28de7948 | 192 | |
1da177e4 | 193 | return 1; |
28de7948 | 194 | } /* if old_block */ |
1da177e4 | 195 | } |
28de7948 | 196 | |
cb00ea35 | 197 | if (i == UDF_SB_NUMPARTS(sb)) { |
1da177e4 LT |
198 | /* outside of partitions */ |
199 | /* for now, fail =) */ | |
200 | return 1; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } |