Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[firefly-linux-kernel-4.4.55.git] / fs / udf / partition.c
1 /*
2  * partition.c
3  *
4  * PURPOSE
5  *      Partition handling routines for the OSTA-UDF(tm) filesystem.
6  *
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  *
17  * 12/06/98 blf  Created file.
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/mutex.h>
28
29 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
30                         uint16_t partition, uint32_t offset)
31 {
32         struct udf_sb_info *sbi = UDF_SB(sb);
33         struct udf_part_map *map;
34         if (partition >= sbi->s_partitions) {
35                 udf_debug("block=%d, partition=%d, offset=%d: invalid partition\n",
36                           block, partition, offset);
37                 return 0xFFFFFFFF;
38         }
39         map = &sbi->s_partmaps[partition];
40         if (map->s_partition_func)
41                 return map->s_partition_func(sb, block, partition, offset);
42         else
43                 return map->s_partition_root + block + offset;
44 }
45
46 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
47                                uint16_t partition, uint32_t offset)
48 {
49         struct buffer_head *bh = NULL;
50         uint32_t newblock;
51         uint32_t index;
52         uint32_t loc;
53         struct udf_sb_info *sbi = UDF_SB(sb);
54         struct udf_part_map *map;
55         struct udf_virtual_data *vdata;
56         struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
57
58         map = &sbi->s_partmaps[partition];
59         vdata = &map->s_type_specific.s_virtual;
60
61         if (block > vdata->s_num_entries) {
62                 udf_debug("Trying to access block beyond end of VAT (%d max %d)\n",
63                           block, vdata->s_num_entries);
64                 return 0xFFFFFFFF;
65         }
66
67         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
68                 loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
69                         vdata->s_start_offset))[block]);
70                 goto translate;
71         }
72         index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
73         if (block >= index) {
74                 block -= index;
75                 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
76                 index = block % (sb->s_blocksize / sizeof(uint32_t));
77         } else {
78                 newblock = 0;
79                 index = vdata->s_start_offset / sizeof(uint32_t) + block;
80         }
81
82         loc = udf_block_map(sbi->s_vat_inode, newblock);
83
84         bh = sb_bread(sb, loc);
85         if (!bh) {
86                 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
87                           sb, block, partition, loc, index);
88                 return 0xFFFFFFFF;
89         }
90
91         loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
92
93         brelse(bh);
94
95 translate:
96         if (iinfo->i_location.partitionReferenceNum == partition) {
97                 udf_debug("recursive call to udf_get_pblock!\n");
98                 return 0xFFFFFFFF;
99         }
100
101         return udf_get_pblock(sb, loc,
102                               iinfo->i_location.partitionReferenceNum,
103                               offset);
104 }
105
106 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
107                                       uint16_t partition, uint32_t offset)
108 {
109         return udf_get_pblock_virt15(sb, block, partition, offset);
110 }
111
112 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
113                                uint16_t partition, uint32_t offset)
114 {
115         int i;
116         struct sparingTable *st = NULL;
117         struct udf_sb_info *sbi = UDF_SB(sb);
118         struct udf_part_map *map;
119         uint32_t packet;
120         struct udf_sparing_data *sdata;
121
122         map = &sbi->s_partmaps[partition];
123         sdata = &map->s_type_specific.s_sparing;
124         packet = (block + offset) & ~(sdata->s_packet_len - 1);
125
126         for (i = 0; i < 4; i++) {
127                 if (sdata->s_spar_map[i] != NULL) {
128                         st = (struct sparingTable *)
129                                         sdata->s_spar_map[i]->b_data;
130                         break;
131                 }
132         }
133
134         if (st) {
135                 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
136                         struct sparingEntry *entry = &st->mapEntry[i];
137                         u32 origLoc = le32_to_cpu(entry->origLocation);
138                         if (origLoc >= 0xFFFFFFF0)
139                                 break;
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)
145                                 break;
146                 }
147         }
148
149         return map->s_partition_root + block + offset;
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;
159         struct udf_sb_info *sbi = UDF_SB(sb);
160         u16 reallocationTableLen;
161         struct buffer_head *bh;
162         int ret = 0;
163
164         mutex_lock(&sbi->s_alloc_mutex);
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;
170                         packet = (old_block - map->s_partition_root) &
171                                                 ~(sdata->s_packet_len - 1);
172
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;
177                                         break;
178                                 }
179
180                         if (!st) {
181                                 ret = 1;
182                                 goto out;
183                         }
184
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) {
192                                         for (; j < 4; j++) {
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);
208                                         }
209                                         *new_block = le32_to_cpu(
210                                                         entry->mappedLocation) +
211                                                      ((old_block -
212                                                         map->s_partition_root) &
213                                                      (sdata->s_packet_len - 1));
214                                         ret = 0;
215                                         goto out;
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));
222                                         ret = 0;
223                                         goto out;
224                                 } else if (origLoc > packet)
225                                         break;
226                         }
227
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);
254                                 }
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));
260                                 ret = 0;
261                                 goto out;
262                         }
263
264                         ret = 1;
265                         goto out;
266                 } /* if old_block */
267         }
268
269         if (i == sbi->s_partitions) {
270                 /* outside of partitions */
271                 /* for now, fail =) */
272                 ret = 1;
273         }
274
275 out:
276         mutex_unlock(&sbi->s_alloc_mutex);
277         return ret;
278 }
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;
285         struct kernel_lb_addr eloc;
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,
298                         map->s_partition_num, ext_offset + offset);
299         }
300
301         brelse(epos.bh);
302         return phyblock;
303 }
304
305 uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
306                                 uint16_t partition, uint32_t offset)
307 {
308         struct udf_sb_info *sbi = UDF_SB(sb);
309         struct udf_part_map *map;
310         struct udf_meta_data *mdata;
311         uint32_t retblk;
312         struct inode *inode;
313
314         udf_debug("READING from METADATA\n");
315
316         map = &sbi->s_partmaps[partition];
317         mdata = &map->s_type_specific.s_metadata;
318         inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
319
320         /* We shouldn't mount such media... */
321         BUG_ON(!inode);
322         retblk = udf_try_read_meta(inode, block, partition, offset);
323         if (retblk == 0xFFFFFFFF && mdata->s_metadata_fe) {
324                 udf_warn(sb, "error reading from METADATA, trying to read from MIRROR\n");
325                 if (!(mdata->s_flags & MF_MIRROR_FE_LOADED)) {
326                         mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
327                                 mdata->s_mirror_file_loc, map->s_partition_num);
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 }