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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * partition.c
3 *
4 * PURPOSE
5 * Partition handling routines for the OSTA-UDF(tm) filesystem.
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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 *
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070017 * 12/06/98 blf Created file.
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/buffer_head.h>
28
Adrian Bunk22ba0312008-04-28 18:38:49 +030029uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
30 uint16_t partition, uint32_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
Marcin Slusarz6c79e982008-02-08 04:20:30 -080032 struct udf_sb_info *sbi = UDF_SB(sb);
33 struct udf_part_map *map;
34 if (partition >= sbi->s_partitions) {
Marcin Slusarz4b111112008-02-08 04:20:36 -080035 udf_debug("block=%d, partition=%d, offset=%d: "
36 "invalid partition\n", block, partition, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 return 0xFFFFFFFF;
38 }
Marcin Slusarz6c79e982008-02-08 04:20:30 -080039 map = &sbi->s_partmaps[partition];
40 if (map->s_partition_func)
41 return map->s_partition_func(sb, block, partition, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 else
Marcin Slusarz6c79e982008-02-08 04:20:30 -080043 return map->s_partition_root + block + offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044}
45
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070046uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070047 uint16_t partition, uint32_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048{
49 struct buffer_head *bh = NULL;
50 uint32_t newblock;
51 uint32_t index;
52 uint32_t loc;
Marcin Slusarz6c79e982008-02-08 04:20:30 -080053 struct udf_sb_info *sbi = UDF_SB(sb);
54 struct udf_part_map *map;
Marcin Slusarz4b111112008-02-08 04:20:36 -080055 struct udf_virtual_data *vdata;
Jan Karafa5e0812008-04-08 02:08:53 +020056 struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Marcin Slusarz6c79e982008-02-08 04:20:30 -080058 map = &sbi->s_partmaps[partition];
Marcin Slusarz4b111112008-02-08 04:20:36 -080059 vdata = &map->s_type_specific.s_virtual;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Marcin Slusarz4b111112008-02-08 04:20:36 -080061 if (block > vdata->s_num_entries) {
62 udf_debug("Trying to access block beyond end of VAT "
63 "(%d max %d)\n", block, vdata->s_num_entries);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 return 0xFFFFFFFF;
65 }
66
Jan Karafa5e0812008-04-08 02:08:53 +020067 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Sebastian Manciulea47c93582008-04-14 17:06:36 +020068 loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
69 vdata->s_start_offset))[block]);
Jan Karafa5e0812008-04-08 02:08:53 +020070 goto translate;
71 }
72 index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070073 if (block >= index) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 block -= index;
75 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
76 index = block % (sb->s_blocksize / sizeof(uint32_t));
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070077 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 newblock = 0;
Marcin Slusarz4b111112008-02-08 04:20:36 -080079 index = vdata->s_start_offset / sizeof(uint32_t) + block;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 }
81
Marcin Slusarz6c79e982008-02-08 04:20:30 -080082 loc = udf_block_map(sbi->s_vat_inode, newblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Marcin Slusarz4b111112008-02-08 04:20:36 -080084 bh = sb_bread(sb, loc);
85 if (!bh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070087 sb, block, partition, loc, index);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return 0xFFFFFFFF;
89 }
90
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070091 loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Jan Kara3bf25cb2007-05-08 00:35:16 -070093 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Jan Karafa5e0812008-04-08 02:08:53 +020095translate:
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080096 if (iinfo->i_location.partitionReferenceNum == partition) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 udf_debug("recursive call to udf_get_pblock!\n");
98 return 0xFFFFFFFF;
99 }
100
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700101 return udf_get_pblock(sb, loc,
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -0800102 iinfo->i_location.partitionReferenceNum,
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700103 offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
Marcin Slusarz4b111112008-02-08 04:20:36 -0800106inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700107 uint16_t partition, uint32_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109 return udf_get_pblock_virt15(sb, block, partition, offset);
110}
111
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800112uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700113 uint16_t partition, uint32_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
115 int i;
116 struct sparingTable *st = NULL;
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800117 struct udf_sb_info *sbi = UDF_SB(sb);
118 struct udf_part_map *map;
119 uint32_t packet;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800120 struct udf_sparing_data *sdata;
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800121
122 map = &sbi->s_partmaps[partition];
Marcin Slusarz4b111112008-02-08 04:20:36 -0800123 sdata = &map->s_type_specific.s_sparing;
124 packet = (block + offset) & ~(sdata->s_packet_len - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700126 for (i = 0; i < 4; i++) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800127 if (sdata->s_spar_map[i] != NULL) {
128 st = (struct sparingTable *)
129 sdata->s_spar_map[i]->b_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 break;
131 }
132 }
133
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700134 if (st) {
135 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800136 struct sparingEntry *entry = &st->mapEntry[i];
137 u32 origLoc = le32_to_cpu(entry->origLocation);
138 if (origLoc >= 0xFFFFFFF0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 break;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800140 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 break;
146 }
147 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700148
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800149 return map->s_partition_root + block + offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
152int 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;
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800159 struct udf_sb_info *sbi = UDF_SB(sb);
Marcin Slusarz4b111112008-02-08 04:20:36 -0800160 u16 reallocationTableLen;
161 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800163 for (i = 0; i < sbi->s_partitions; i++) {
164 struct udf_part_map *map = &sbi->s_partmaps[i];
165 if (old_block > map->s_partition_root &&
166 old_block < map->s_partition_root + map->s_partition_len) {
167 sdata = &map->s_type_specific.s_sparing;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800168 packet = (old_block - map->s_partition_root) &
169 ~(sdata->s_packet_len - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Marcin Slusarz4b111112008-02-08 04:20:36 -0800171 for (j = 0; j < 4; j++)
172 if (sdata->s_spar_map[j] != NULL) {
173 st = (struct sparingTable *)
174 sdata->s_spar_map[j]->b_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 break;
176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 if (!st)
179 return 1;
180
Marcin Slusarz4b111112008-02-08 04:20:36 -0800181 reallocationTableLen =
182 le16_to_cpu(st->reallocationTableLen);
183 for (k = 0; k < reallocationTableLen; k++) {
184 struct sparingEntry *entry = &st->mapEntry[k];
185 u32 origLoc = le32_to_cpu(entry->origLocation);
186
187 if (origLoc == 0xFFFFFFFF) {
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700188 for (; j < 4; j++) {
Marcin Slusarz4b111112008-02-08 04:20:36 -0800189 int len;
190 bh = sdata->s_spar_map[j];
191 if (!bh)
192 continue;
193
194 st = (struct sparingTable *)
195 bh->b_data;
196 entry->origLocation =
197 cpu_to_le32(packet);
198 len =
199 sizeof(struct sparingTable) +
200 reallocationTableLen *
201 sizeof(struct sparingEntry);
202 udf_update_tag((char *)st, len);
203 mark_buffer_dirty(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800205 *new_block = le32_to_cpu(
206 entry->mappedLocation) +
207 ((old_block -
208 map->s_partition_root) &
209 (sdata->s_packet_len - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return 0;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800211 } 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 return 0;
Marcin Slusarz4b111112008-02-08 04:20:36 -0800218 } else if (origLoc > packet)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 break;
220 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700221
Marcin Slusarz4b111112008-02-08 04:20:36 -0800222 for (l = k; l < reallocationTableLen; l++) {
223 struct sparingEntry *entry = &st->mapEntry[l];
224 u32 origLoc = le32_to_cpu(entry->origLocation);
225
226 if (origLoc != 0xFFFFFFFF)
227 continue;
228
229 for (; j < 4; j++) {
230 bh = sdata->s_spar_map[j];
231 if (!bh)
232 continue;
233
234 st = (struct sparingTable *)bh->b_data;
235 mapEntry = st->mapEntry[l];
236 mapEntry.origLocation =
237 cpu_to_le32(packet);
238 memmove(&st->mapEntry[k + 1],
239 &st->mapEntry[k],
240 (l - k) *
241 sizeof(struct sparingEntry));
242 st->mapEntry[k] = mapEntry;
243 udf_update_tag((char *)st,
244 sizeof(struct sparingTable) +
245 reallocationTableLen *
246 sizeof(struct sparingEntry));
247 mark_buffer_dirty(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 }
Marcin Slusarz4b111112008-02-08 04:20:36 -0800249 *new_block =
250 le32_to_cpu(
251 st->mapEntry[k].mappedLocation) +
252 ((old_block - map->s_partition_root) &
253 (sdata->s_packet_len - 1));
254 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return 1;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700258 } /* if old_block */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700260
Marcin Slusarz6c79e982008-02-08 04:20:30 -0800261 if (i == sbi->s_partitions) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 /* outside of partitions */
263 /* for now, fail =) */
264 return 1;
265 }
266
267 return 0;
268}
Jan Karabfb257a2008-04-08 20:37:21 +0200269
270static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
271 uint16_t partition, uint32_t offset)
272{
273 struct super_block *sb = inode->i_sb;
274 struct udf_part_map *map;
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200275 struct kernel_lb_addr eloc;
Jan Karabfb257a2008-04-08 20:37:21 +0200276 uint32_t elen;
277 sector_t ext_offset;
278 struct extent_position epos = {};
279 uint32_t phyblock;
280
281 if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
282 (EXT_RECORDED_ALLOCATED >> 30))
283 phyblock = 0xFFFFFFFF;
284 else {
285 map = &UDF_SB(sb)->s_partmaps[partition];
286 /* map to sparable/physical partition desc */
287 phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
288 map->s_partition_num, ext_offset + offset);
289 }
290
291 brelse(epos.bh);
292 return phyblock;
293}
294
295uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
296 uint16_t partition, uint32_t offset)
297{
298 struct udf_sb_info *sbi = UDF_SB(sb);
299 struct udf_part_map *map;
300 struct udf_meta_data *mdata;
301 uint32_t retblk;
302 struct inode *inode;
303
304 udf_debug("READING from METADATA\n");
305
306 map = &sbi->s_partmaps[partition];
307 mdata = &map->s_type_specific.s_metadata;
308 inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
309
310 /* We shouldn't mount such media... */
311 BUG_ON(!inode);
312 retblk = udf_try_read_meta(inode, block, partition, offset);
313 if (retblk == 0xFFFFFFFF) {
314 udf_warning(sb, __func__, "error reading from METADATA, "
315 "trying to read from MIRROR");
316 inode = mdata->s_mirror_fe;
317 if (!inode)
318 return 0xFFFFFFFF;
319 retblk = udf_try_read_meta(inode, block, partition, offset);
320 }
321
322 return retblk;
323}