oom: move oom_adj value from task_struct to mm_struct
[linux-2.6] / 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/slab.h>
28 #include <linux/buffer_head.h>
29
30 uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
31                         uint16_t partition, uint32_t offset)
32 {
33         struct udf_sb_info *sbi = UDF_SB(sb);
34         struct udf_part_map *map;
35         if (partition >= sbi->s_partitions) {
36                 udf_debug("block=%d, partition=%d, offset=%d: "
37                           "invalid partition\n", block, partition, offset);
38                 return 0xFFFFFFFF;
39         }
40         map = &sbi->s_partmaps[partition];
41         if (map->s_partition_func)
42                 return map->s_partition_func(sb, block, partition, offset);
43         else
44                 return map->s_partition_root + block + offset;
45 }
46
47 uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block,
48                                uint16_t partition, uint32_t offset)
49 {
50         struct buffer_head *bh = NULL;
51         uint32_t newblock;
52         uint32_t index;
53         uint32_t loc;
54         struct udf_sb_info *sbi = UDF_SB(sb);
55         struct udf_part_map *map;
56         struct udf_virtual_data *vdata;
57         struct udf_inode_info *iinfo = UDF_I(sbi->s_vat_inode);
58
59         map = &sbi->s_partmaps[partition];
60         vdata = &map->s_type_specific.s_virtual;
61
62         if (block > vdata->s_num_entries) {
63                 udf_debug("Trying to access block beyond end of VAT "
64                           "(%d max %d)\n", block, vdata->s_num_entries);
65                 return 0xFFFFFFFF;
66         }
67
68         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
69                 loc = le32_to_cpu(((__le32 *)(iinfo->i_ext.i_data +
70                         vdata->s_start_offset))[block]);
71                 goto translate;
72         }
73         index = (sb->s_blocksize - vdata->s_start_offset) / sizeof(uint32_t);
74         if (block >= index) {
75                 block -= index;
76                 newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
77                 index = block % (sb->s_blocksize / sizeof(uint32_t));
78         } else {
79                 newblock = 0;
80                 index = vdata->s_start_offset / sizeof(uint32_t) + block;
81         }
82
83         loc = udf_block_map(sbi->s_vat_inode, newblock);
84
85         bh = sb_bread(sb, loc);
86         if (!bh) {
87                 udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
88                           sb, block, partition, loc, index);
89                 return 0xFFFFFFFF;
90         }
91
92         loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
93
94         brelse(bh);
95
96 translate:
97         if (iinfo->i_location.partitionReferenceNum == partition) {
98                 udf_debug("recursive call to udf_get_pblock!\n");
99                 return 0xFFFFFFFF;
100         }
101
102         return udf_get_pblock(sb, loc,
103                               iinfo->i_location.partitionReferenceNum,
104                               offset);
105 }
106
107 inline uint32_t udf_get_pblock_virt20(struct super_block *sb, uint32_t block,
108                                       uint16_t partition, uint32_t offset)
109 {
110         return udf_get_pblock_virt15(sb, block, partition, offset);
111 }
112
113 uint32_t udf_get_pblock_spar15(struct super_block *sb, uint32_t block,
114                                uint16_t partition, uint32_t offset)
115 {
116         int i;
117         struct sparingTable *st = NULL;
118         struct udf_sb_info *sbi = UDF_SB(sb);
119         struct udf_part_map *map;
120         uint32_t packet;
121         struct udf_sparing_data *sdata;
122
123         map = &sbi->s_partmaps[partition];
124         sdata = &map->s_type_specific.s_sparing;
125         packet = (block + offset) & ~(sdata->s_packet_len - 1);
126
127         for (i = 0; i < 4; i++) {
128                 if (sdata->s_spar_map[i] != NULL) {
129                         st = (struct sparingTable *)
130                                         sdata->s_spar_map[i]->b_data;
131                         break;
132                 }
133         }
134
135         if (st) {
136                 for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {
137                         struct sparingEntry *entry = &st->mapEntry[i];
138                         u32 origLoc = le32_to_cpu(entry->origLocation);
139                         if (origLoc >= 0xFFFFFFF0)
140                                 break;
141                         else if (origLoc == packet)
142                                 return le32_to_cpu(entry->mappedLocation) +
143                                         ((block + offset) &
144                                                 (sdata->s_packet_len - 1));
145                         else if (origLoc > packet)
146                                 break;
147                 }
148         }
149
150         return map->s_partition_root + block + offset;
151 }
152
153 int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
154 {
155         struct udf_sparing_data *sdata;
156         struct sparingTable *st = NULL;
157         struct sparingEntry mapEntry;
158         uint32_t packet;
159         int i, j, k, l;
160         struct udf_sb_info *sbi = UDF_SB(sb);
161         u16 reallocationTableLen;
162         struct buffer_head *bh;
163
164         for (i = 0; i < sbi->s_partitions; i++) {
165                 struct udf_part_map *map = &sbi->s_partmaps[i];
166                 if (old_block > map->s_partition_root &&
167                     old_block < map->s_partition_root + map->s_partition_len) {
168                         sdata = &map->s_type_specific.s_sparing;
169                         packet = (old_block - map->s_partition_root) &
170                                                 ~(sdata->s_packet_len - 1);
171
172                         for (j = 0; j < 4; j++)
173                                 if (sdata->s_spar_map[j] != NULL) {
174                                         st = (struct sparingTable *)
175                                                 sdata->s_spar_map[j]->b_data;
176                                         break;
177                                 }
178
179                         if (!st)
180                                 return 1;
181
182                         reallocationTableLen =
183                                         le16_to_cpu(st->reallocationTableLen);
184                         for (k = 0; k < reallocationTableLen; k++) {
185                                 struct sparingEntry *entry = &st->mapEntry[k];
186                                 u32 origLoc = le32_to_cpu(entry->origLocation);
187
188                                 if (origLoc == 0xFFFFFFFF) {
189                                         for (; j < 4; j++) {
190                                                 int len;
191                                                 bh = sdata->s_spar_map[j];
192                                                 if (!bh)
193                                                         continue;
194
195                                                 st = (struct sparingTable *)
196                                                                 bh->b_data;
197                                                 entry->origLocation =
198                                                         cpu_to_le32(packet);
199                                                 len =
200                                                   sizeof(struct sparingTable) +
201                                                   reallocationTableLen *
202                                                   sizeof(struct sparingEntry);
203                                                 udf_update_tag((char *)st, len);
204                                                 mark_buffer_dirty(bh);
205                                         }
206                                         *new_block = le32_to_cpu(
207                                                         entry->mappedLocation) +
208                                                      ((old_block -
209                                                         map->s_partition_root) &
210                                                      (sdata->s_packet_len - 1));
211                                         return 0;
212                                 } else if (origLoc == packet) {
213                                         *new_block = le32_to_cpu(
214                                                         entry->mappedLocation) +
215                                                      ((old_block -
216                                                         map->s_partition_root) &
217                                                      (sdata->s_packet_len - 1));
218                                         return 0;
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                                 return 0;
256                         }
257
258                         return 1;
259                 } /* if old_block */
260         }
261
262         if (i == sbi->s_partitions) {
263                 /* outside of partitions */
264                 /* for now, fail =) */
265                 return 1;
266         }
267
268         return 0;
269 }
270
271 static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
272                                         uint16_t partition, uint32_t offset)
273 {
274         struct super_block *sb = inode->i_sb;
275         struct udf_part_map *map;
276         struct kernel_lb_addr eloc;
277         uint32_t elen;
278         sector_t ext_offset;
279         struct extent_position epos = {};
280         uint32_t phyblock;
281
282         if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
283                                                 (EXT_RECORDED_ALLOCATED >> 30))
284                 phyblock = 0xFFFFFFFF;
285         else {
286                 map = &UDF_SB(sb)->s_partmaps[partition];
287                 /* map to sparable/physical partition desc */
288                 phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
289                         map->s_partition_num, ext_offset + offset);
290         }
291
292         brelse(epos.bh);
293         return phyblock;
294 }
295
296 uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
297                                 uint16_t partition, uint32_t offset)
298 {
299         struct udf_sb_info *sbi = UDF_SB(sb);
300         struct udf_part_map *map;
301         struct udf_meta_data *mdata;
302         uint32_t retblk;
303         struct inode *inode;
304
305         udf_debug("READING from METADATA\n");
306
307         map = &sbi->s_partmaps[partition];
308         mdata = &map->s_type_specific.s_metadata;
309         inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
310
311         /* We shouldn't mount such media... */
312         BUG_ON(!inode);
313         retblk = udf_try_read_meta(inode, block, partition, offset);
314         if (retblk == 0xFFFFFFFF) {
315                 udf_warning(sb, __func__, "error reading from METADATA, "
316                         "trying to read from MIRROR");
317                 inode = mdata->s_mirror_fe;
318                 if (!inode)
319                         return 0xFFFFFFFF;
320                 retblk = udf_try_read_meta(inode, block, partition, offset);
321         }
322
323         return retblk;
324 }