1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * partition.c
4 *
5 * PURPOSE
6 * Partition handling routines for the OSTA-UDF(tm) filesystem.
7 *
8 * COPYRIGHT
9 * (C) 1998-2001 Ben Fennema
10 *
11 * HISTORY
12 *
13 * 12/06/98 blf Created file.
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>
23 #include <linux/mutex.h>
24
25 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
26 uint16_t partition, uint32_t offset)
27 {
28 struct udf_sb_info *sbi = UDF_SB(sb);
29 struct udf_part_map *map;
30 if (partition >= sbi->s_partitions) {
31 udf_debug("block=%u, partition=%u, offset=%u: invalid partition\n",
32 block, partition, offset);
33 return 0xFFFFFFFF;
34 }
35 map = &sbi->s_partmaps[partition];
36 if (map->s_partition_func)
37 return map->s_partition_func(sb, block, partition, offset);
38 else
39 return map->s_partition_root + block + offset;
40 }
41
42 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
43 uint16_t partition, uint32_t offset)
44 {
45 struct buffer_head *bh = NULL;
46 uint32_t newblock;
47 uint32_t index;
48 uint32_t loc;
49 struct udf_sb_info *sbi = UDF_SB(sb);
50 struct udf_part_map *map;
51 struct udf_virtual_data *vdata;
52 struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
53 int err;
54
55 map = &sbi->s_partmaps[partition];
56 vdata = &map->s_type_specific.s_virtual;
57
58 if (block > vdata->s_num_entries) {
59 udf_debug("Trying to access block beyond end of VAT (%u max %u)\n",
60 block, vdata->s_num_entries);
61 return 0xFFFFFFFF;
62 }
63
64 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
65 loc = le32_to_cpu(((__le32 *)(iinfo->i_data +
66 vdata->s_start_offset))[block]);
67 goto translate;
68 }
69 index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
70 if (block >= index) {
71 block -= index;
72 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
73 index = block % (sb->s_blocksize / sizeof(uint32_t));
74 } else {
75 newblock = 0;
76 index = vdata->s_start_offset / sizeof(uint32_t) + block;
77 }
78
79 bh = udf_bread(sbi->s_vat_inode, newblock, 0, &err);
80 if (!bh) {
81 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%u,%u)\n",
82 sb, block, partition);
83 return 0xFFFFFFFF;
84 }
85
86 loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
87
88 brelse(bh);
89
90 translate:
91 if (iinfo->i_location.partitionReferenceNum == partition) {
92 udf_debug("recursive call to udf_get_pblock!\n");
93 return 0xFFFFFFFF;
94 }
95
96 return udf_get_pblock(sb, loc,
97 iinfo->i_location.partitionReferenceNum,
98 offset);
99 }
100
101 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
102 uint16_t partition, uint32_t offset)
103 {
104 return udf_get_pblock_virt15(sb, block, partition, offset);
105 }
106
107 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
108 uint16_t partition, uint32_t offset)
109 {
110 int i;
111 struct sparingTable *st = NULL;
112 struct udf_sb_info *sbi = UDF_SB(sb);
113 struct udf_part_map *map;
114 uint32_t packet;
115 struct udf_sparing_data *sdata;
116
117 map = &sbi->s_partmaps[partition];
118 sdata = &map->s_type_specific.s_sparing;
119 packet = (block + offset) & ~(sdata->s_packet_len - 1);
120
121 for (i = 0; i < 4; i++) {
122 if (sdata->s_spar_map[i] != NULL) {
123 st = (struct sparingTable *)
124 sdata->s_spar_map[i]->b_data;
125 break;
126 }
127 }
128
129 if (st) {
130 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
131 struct sparingEntry *entry = &st->mapEntry[i];
132 u32 origLoc = le32_to_cpu(entry->origLocation);
133 if (origLoc >= 0xFFFFFFF0)
134 break;
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)
140 break;
141 }
142 }
143
144 return map->s_partition_root + block + offset;
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;
154 struct udf_sb_info *sbi = UDF_SB(sb);
155 u16 reallocationTableLen;
156 struct buffer_head *bh;
157 int ret = 0;
158
159 mutex_lock(&sbi->s_alloc_mutex);
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;
165 packet = (old_block - map->s_partition_root) &
166 ~(sdata->s_packet_len - 1);
167
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;
172 break;
173 }
174
175 if (!st) {
176 ret = 1;
177 goto out;
178 }
179
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) {
187 for (; j < 4; j++) {
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);
203 }
204 *new_block = le32_to_cpu(
205 entry->mappedLocation) +
206 ((old_block -
207 map->s_partition_root) &
208 (sdata->s_packet_len - 1));
209 ret = 0;
210 goto out;
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));
217 ret = 0;
218 goto out;
219 } else if (origLoc > packet)
220 break;
221 }
222
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);
249 }
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));
255 ret = 0;
256 goto out;
257 }
258
259 ret = 1;
260 goto out;
261 } /* if old_block */
262 }
263
264 if (i == sbi->s_partitions) {
265 /* outside of partitions */
266 /* for now, fail =) */
267 ret = 1;
268 }
269
270 out:
271 mutex_unlock(&sbi->s_alloc_mutex);
272 return ret;
273 }
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;
280 struct kernel_lb_addr eloc;
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,
293 map->s_type_specific.s_metadata.s_phys_partition_ref,
294 ext_offset + offset);
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
316 if (!inode)
317 return 0xFFFFFFFF;
318
319 retblk = udf_try_read_meta(inode, block, partition, offset);
320 if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
321 udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
322 if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
323 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
324 mdata->s_mirror_file_loc,
325 mdata->s_phys_partition_ref);
326 if (IS_ERR(mdata->s_mirror_fe))
327 mdata->s_mirror_fe = NULL;
328 mdata->s_flags |= MF_MIRROR_FE_LOADED;
329 }
330
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 }
339
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