Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * balloc.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Block allocation 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) 1999-2001 Ben Fennema | |
14 | * (C) 1999 Stelias Computing Inc | |
15 | * | |
16 | * HISTORY | |
17 | * | |
18 | * 02/24/99 blf Created. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "udfdecl.h" | |
23 | ||
1da177e4 LT |
24 | #include <linux/bitops.h> |
25 | ||
26 | #include "udf_i.h" | |
27 | #include "udf_sb.h" | |
28 | ||
9ad1e1e4 AM |
29 | #define udf_clear_bit __test_and_clear_bit_le |
30 | #define udf_set_bit __test_and_set_bit_le | |
31 | #define udf_test_bit test_bit_le | |
32 | #define udf_find_next_one_bit find_next_bit_le | |
1da177e4 | 33 | |
cb00ea35 CG |
34 | static int read_block_bitmap(struct super_block *sb, |
35 | struct udf_bitmap *bitmap, unsigned int block, | |
36 | unsigned long bitmap_nr) | |
1da177e4 LT |
37 | { |
38 | struct buffer_head *bh = NULL; | |
39 | int retval = 0; | |
5ca4e4be | 40 | struct kernel_lb_addr loc; |
1da177e4 LT |
41 | |
42 | loc.logicalBlockNum = bitmap->s_extPosition; | |
6c79e987 | 43 | loc.partitionReferenceNum = UDF_SB(sb)->s_partition; |
1da177e4 | 44 | |
97e961fd | 45 | bh = udf_tread(sb, udf_get_lb_pblock(sb, &loc, block)); |
4b11111a | 46 | if (!bh) |
1da177e4 | 47 | retval = -EIO; |
4b11111a | 48 | |
1da177e4 LT |
49 | bitmap->s_block_bitmap[bitmap_nr] = bh; |
50 | return retval; | |
51 | } | |
52 | ||
cb00ea35 CG |
53 | static int __load_block_bitmap(struct super_block *sb, |
54 | struct udf_bitmap *bitmap, | |
55 | unsigned int block_group) | |
1da177e4 LT |
56 | { |
57 | int retval = 0; | |
58 | int nr_groups = bitmap->s_nr_groups; | |
59 | ||
cb00ea35 | 60 | if (block_group >= nr_groups) { |
a983f368 JP |
61 | udf_debug("block_group (%d) > nr_groups (%d)\n", |
62 | block_group, nr_groups); | |
1da177e4 LT |
63 | } |
64 | ||
6fbaad87 | 65 | if (bitmap->s_block_bitmap[block_group]) |
1da177e4 | 66 | return block_group; |
6fbaad87 FF |
67 | |
68 | retval = read_block_bitmap(sb, bitmap, block_group, block_group); | |
69 | if (retval < 0) | |
70 | return retval; | |
71 | ||
72 | return block_group; | |
1da177e4 LT |
73 | } |
74 | ||
cb00ea35 CG |
75 | static inline int load_block_bitmap(struct super_block *sb, |
76 | struct udf_bitmap *bitmap, | |
77 | unsigned int block_group) | |
1da177e4 LT |
78 | { |
79 | int slot; | |
80 | ||
81 | slot = __load_block_bitmap(sb, bitmap, block_group); | |
82 | ||
83 | if (slot < 0) | |
84 | return slot; | |
85 | ||
86 | if (!bitmap->s_block_bitmap[slot]) | |
87 | return -EIO; | |
88 | ||
89 | return slot; | |
90 | } | |
91 | ||
146bca72 | 92 | static void udf_add_free_space(struct super_block *sb, u16 partition, u32 cnt) |
742ba02a | 93 | { |
146bca72 | 94 | struct udf_sb_info *sbi = UDF_SB(sb); |
742ba02a MS |
95 | struct logicalVolIntegrityDesc *lvid; |
96 | ||
146bca72 JK |
97 | if (!sbi->s_lvid_bh) |
98 | return; | |
742ba02a MS |
99 | |
100 | lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data; | |
c2104fda | 101 | le32_add_cpu(&lvid->freeSpaceTable[partition], cnt); |
146bca72 | 102 | udf_updated_lvid(sb); |
742ba02a MS |
103 | } |
104 | ||
cb00ea35 | 105 | static void udf_bitmap_free_blocks(struct super_block *sb, |
cb00ea35 | 106 | struct udf_bitmap *bitmap, |
97e961fd PE |
107 | struct kernel_lb_addr *bloc, |
108 | uint32_t offset, | |
cb00ea35 | 109 | uint32_t count) |
1da177e4 LT |
110 | { |
111 | struct udf_sb_info *sbi = UDF_SB(sb); | |
cb00ea35 | 112 | struct buffer_head *bh = NULL; |
97e961fd | 113 | struct udf_part_map *partmap; |
1da177e4 LT |
114 | unsigned long block; |
115 | unsigned long block_group; | |
116 | unsigned long bit; | |
117 | unsigned long i; | |
118 | int bitmap_nr; | |
119 | unsigned long overflow; | |
120 | ||
1e7933de | 121 | mutex_lock(&sbi->s_alloc_mutex); |
97e961fd | 122 | partmap = &sbi->s_partmaps[bloc->partitionReferenceNum]; |
69ecbbed DC |
123 | if (bloc->logicalBlockNum + count < count || |
124 | (bloc->logicalBlockNum + count) > partmap->s_partition_len) { | |
28de7948 | 125 | udf_debug("%d < %d || %d + %d > %d\n", |
a983f368 JP |
126 | bloc->logicalBlockNum, 0, |
127 | bloc->logicalBlockNum, count, | |
128 | partmap->s_partition_len); | |
1da177e4 LT |
129 | goto error_return; |
130 | } | |
131 | ||
97e961fd | 132 | block = bloc->logicalBlockNum + offset + |
4b11111a | 133 | (sizeof(struct spaceBitmapDesc) << 3); |
1da177e4 | 134 | |
4daa1b87 MS |
135 | do { |
136 | overflow = 0; | |
137 | block_group = block >> (sb->s_blocksize_bits + 3); | |
138 | bit = block % (sb->s_blocksize << 3); | |
139 | ||
140 | /* | |
141 | * Check to see if we are freeing blocks across a group boundary. | |
142 | */ | |
143 | if (bit + count > (sb->s_blocksize << 3)) { | |
144 | overflow = bit + count - (sb->s_blocksize << 3); | |
145 | count -= overflow; | |
1da177e4 | 146 | } |
4daa1b87 MS |
147 | bitmap_nr = load_block_bitmap(sb, bitmap, block_group); |
148 | if (bitmap_nr < 0) | |
149 | goto error_return; | |
150 | ||
151 | bh = bitmap->s_block_bitmap[bitmap_nr]; | |
152 | for (i = 0; i < count; i++) { | |
153 | if (udf_set_bit(bit + i, bh->b_data)) { | |
154 | udf_debug("bit %ld already set\n", bit + i); | |
155 | udf_debug("byte=%2x\n", | |
a983f368 | 156 | ((char *)bh->b_data)[(bit + i) >> 3]); |
4daa1b87 MS |
157 | } |
158 | } | |
7abc2e45 | 159 | udf_add_free_space(sb, sbi->s_partition, count); |
4daa1b87 MS |
160 | mark_buffer_dirty(bh); |
161 | if (overflow) { | |
162 | block += count; | |
163 | count = overflow; | |
164 | } | |
165 | } while (overflow); | |
166 | ||
28de7948 | 167 | error_return: |
1e7933de | 168 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
169 | } |
170 | ||
cb00ea35 | 171 | static int udf_bitmap_prealloc_blocks(struct super_block *sb, |
cb00ea35 CG |
172 | struct udf_bitmap *bitmap, |
173 | uint16_t partition, uint32_t first_block, | |
174 | uint32_t block_count) | |
1da177e4 LT |
175 | { |
176 | struct udf_sb_info *sbi = UDF_SB(sb); | |
177 | int alloc_count = 0; | |
178 | int bit, block, block_group, group_start; | |
179 | int nr_groups, bitmap_nr; | |
180 | struct buffer_head *bh; | |
6c79e987 | 181 | __u32 part_len; |
1da177e4 | 182 | |
1e7933de | 183 | mutex_lock(&sbi->s_alloc_mutex); |
6c79e987 | 184 | part_len = sbi->s_partmaps[partition].s_partition_len; |
3391faa4 | 185 | if (first_block >= part_len) |
1da177e4 LT |
186 | goto out; |
187 | ||
6c79e987 MS |
188 | if (first_block + block_count > part_len) |
189 | block_count = part_len - first_block; | |
1da177e4 | 190 | |
4daa1b87 MS |
191 | do { |
192 | nr_groups = udf_compute_nr_groups(sb, partition); | |
193 | block = first_block + (sizeof(struct spaceBitmapDesc) << 3); | |
194 | block_group = block >> (sb->s_blocksize_bits + 3); | |
195 | group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc); | |
1da177e4 | 196 | |
4daa1b87 MS |
197 | bitmap_nr = load_block_bitmap(sb, bitmap, block_group); |
198 | if (bitmap_nr < 0) | |
199 | goto out; | |
200 | bh = bitmap->s_block_bitmap[bitmap_nr]; | |
1da177e4 | 201 | |
4daa1b87 | 202 | bit = block % (sb->s_blocksize << 3); |
1da177e4 | 203 | |
4daa1b87 | 204 | while (bit < (sb->s_blocksize << 3) && block_count > 0) { |
36350462 | 205 | if (!udf_clear_bit(bit, bh->b_data)) |
4daa1b87 | 206 | goto out; |
4daa1b87 MS |
207 | block_count--; |
208 | alloc_count++; | |
209 | bit++; | |
210 | block++; | |
1da177e4 | 211 | } |
4daa1b87 MS |
212 | mark_buffer_dirty(bh); |
213 | } while (block_count > 0); | |
214 | ||
28de7948 | 215 | out: |
146bca72 | 216 | udf_add_free_space(sb, partition, -alloc_count); |
1e7933de | 217 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
218 | return alloc_count; |
219 | } | |
220 | ||
cb00ea35 | 221 | static int udf_bitmap_new_block(struct super_block *sb, |
cb00ea35 CG |
222 | struct udf_bitmap *bitmap, uint16_t partition, |
223 | uint32_t goal, int *err) | |
1da177e4 LT |
224 | { |
225 | struct udf_sb_info *sbi = UDF_SB(sb); | |
cb00ea35 | 226 | int newbit, bit = 0, block, block_group, group_start; |
1da177e4 LT |
227 | int end_goal, nr_groups, bitmap_nr, i; |
228 | struct buffer_head *bh = NULL; | |
229 | char *ptr; | |
230 | int newblock = 0; | |
231 | ||
232 | *err = -ENOSPC; | |
1e7933de | 233 | mutex_lock(&sbi->s_alloc_mutex); |
1da177e4 | 234 | |
28de7948 | 235 | repeat: |
3391faa4 | 236 | if (goal >= sbi->s_partmaps[partition].s_partition_len) |
1da177e4 LT |
237 | goal = 0; |
238 | ||
239 | nr_groups = bitmap->s_nr_groups; | |
240 | block = goal + (sizeof(struct spaceBitmapDesc) << 3); | |
241 | block_group = block >> (sb->s_blocksize_bits + 3); | |
242 | group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc); | |
243 | ||
244 | bitmap_nr = load_block_bitmap(sb, bitmap, block_group); | |
245 | if (bitmap_nr < 0) | |
246 | goto error_return; | |
247 | bh = bitmap->s_block_bitmap[bitmap_nr]; | |
28de7948 CG |
248 | ptr = memscan((char *)bh->b_data + group_start, 0xFF, |
249 | sb->s_blocksize - group_start); | |
1da177e4 | 250 | |
cb00ea35 | 251 | if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) { |
1da177e4 | 252 | bit = block % (sb->s_blocksize << 3); |
28de7948 | 253 | if (udf_test_bit(bit, bh->b_data)) |
1da177e4 | 254 | goto got_block; |
28de7948 | 255 | |
1da177e4 LT |
256 | end_goal = (bit + 63) & ~63; |
257 | bit = udf_find_next_one_bit(bh->b_data, end_goal, bit); | |
258 | if (bit < end_goal) | |
259 | goto got_block; | |
28de7948 | 260 | |
4b11111a MS |
261 | ptr = memscan((char *)bh->b_data + (bit >> 3), 0xFF, |
262 | sb->s_blocksize - ((bit + 7) >> 3)); | |
1da177e4 | 263 | newbit = (ptr - ((char *)bh->b_data)) << 3; |
cb00ea35 | 264 | if (newbit < sb->s_blocksize << 3) { |
1da177e4 LT |
265 | bit = newbit; |
266 | goto search_back; | |
267 | } | |
28de7948 | 268 | |
4b11111a MS |
269 | newbit = udf_find_next_one_bit(bh->b_data, |
270 | sb->s_blocksize << 3, bit); | |
cb00ea35 | 271 | if (newbit < sb->s_blocksize << 3) { |
1da177e4 LT |
272 | bit = newbit; |
273 | goto got_block; | |
274 | } | |
275 | } | |
276 | ||
cb00ea35 CG |
277 | for (i = 0; i < (nr_groups * 2); i++) { |
278 | block_group++; | |
1da177e4 LT |
279 | if (block_group >= nr_groups) |
280 | block_group = 0; | |
281 | group_start = block_group ? 0 : sizeof(struct spaceBitmapDesc); | |
282 | ||
283 | bitmap_nr = load_block_bitmap(sb, bitmap, block_group); | |
284 | if (bitmap_nr < 0) | |
285 | goto error_return; | |
286 | bh = bitmap->s_block_bitmap[bitmap_nr]; | |
cb00ea35 | 287 | if (i < nr_groups) { |
28de7948 CG |
288 | ptr = memscan((char *)bh->b_data + group_start, 0xFF, |
289 | sb->s_blocksize - group_start); | |
cb00ea35 | 290 | if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) { |
1da177e4 LT |
291 | bit = (ptr - ((char *)bh->b_data)) << 3; |
292 | break; | |
293 | } | |
cb00ea35 | 294 | } else { |
6f644e5f | 295 | bit = udf_find_next_one_bit(bh->b_data, |
28de7948 CG |
296 | sb->s_blocksize << 3, |
297 | group_start << 3); | |
1da177e4 LT |
298 | if (bit < sb->s_blocksize << 3) |
299 | break; | |
300 | } | |
301 | } | |
cb00ea35 | 302 | if (i >= (nr_groups * 2)) { |
1e7933de | 303 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
304 | return newblock; |
305 | } | |
306 | if (bit < sb->s_blocksize << 3) | |
307 | goto search_back; | |
308 | else | |
4b11111a MS |
309 | bit = udf_find_next_one_bit(bh->b_data, sb->s_blocksize << 3, |
310 | group_start << 3); | |
cb00ea35 | 311 | if (bit >= sb->s_blocksize << 3) { |
1e7933de | 312 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
313 | return 0; |
314 | } | |
315 | ||
28de7948 | 316 | search_back: |
4b11111a MS |
317 | i = 0; |
318 | while (i < 7 && bit > (group_start << 3) && | |
319 | udf_test_bit(bit - 1, bh->b_data)) { | |
320 | ++i; | |
321 | --bit; | |
322 | } | |
1da177e4 | 323 | |
28de7948 | 324 | got_block: |
1da177e4 | 325 | newblock = bit + (block_group << (sb->s_blocksize_bits + 3)) - |
28de7948 | 326 | (sizeof(struct spaceBitmapDesc) << 3); |
1da177e4 | 327 | |
cb00ea35 | 328 | if (!udf_clear_bit(bit, bh->b_data)) { |
1da177e4 LT |
329 | udf_debug("bit already cleared for block %d\n", bit); |
330 | goto repeat; | |
331 | } | |
332 | ||
333 | mark_buffer_dirty(bh); | |
334 | ||
146bca72 | 335 | udf_add_free_space(sb, partition, -1); |
1e7933de | 336 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
337 | *err = 0; |
338 | return newblock; | |
339 | ||
28de7948 | 340 | error_return: |
1da177e4 | 341 | *err = -EIO; |
1e7933de | 342 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
343 | return 0; |
344 | } | |
345 | ||
cb00ea35 | 346 | static void udf_table_free_blocks(struct super_block *sb, |
cb00ea35 | 347 | struct inode *table, |
97e961fd PE |
348 | struct kernel_lb_addr *bloc, |
349 | uint32_t offset, | |
cb00ea35 | 350 | uint32_t count) |
1da177e4 LT |
351 | { |
352 | struct udf_sb_info *sbi = UDF_SB(sb); | |
97e961fd | 353 | struct udf_part_map *partmap; |
1da177e4 | 354 | uint32_t start, end; |
ff116fc8 | 355 | uint32_t elen; |
5ca4e4be | 356 | struct kernel_lb_addr eloc; |
ff116fc8 | 357 | struct extent_position oepos, epos; |
1da177e4 | 358 | int8_t etype; |
48d6d8ff | 359 | struct udf_inode_info *iinfo; |
1da177e4 | 360 | |
1e7933de | 361 | mutex_lock(&sbi->s_alloc_mutex); |
97e961fd | 362 | partmap = &sbi->s_partmaps[bloc->partitionReferenceNum]; |
69ecbbed DC |
363 | if (bloc->logicalBlockNum + count < count || |
364 | (bloc->logicalBlockNum + count) > partmap->s_partition_len) { | |
28de7948 | 365 | udf_debug("%d < %d || %d + %d > %d\n", |
a983f368 JP |
366 | bloc->logicalBlockNum, 0, |
367 | bloc->logicalBlockNum, count, | |
97e961fd | 368 | partmap->s_partition_len); |
1da177e4 LT |
369 | goto error_return; |
370 | } | |
371 | ||
48d6d8ff | 372 | iinfo = UDF_I(table); |
146bca72 | 373 | udf_add_free_space(sb, sbi->s_partition, count); |
1da177e4 | 374 | |
97e961fd PE |
375 | start = bloc->logicalBlockNum + offset; |
376 | end = bloc->logicalBlockNum + offset + count - 1; | |
1da177e4 | 377 | |
ff116fc8 | 378 | epos.offset = oepos.offset = sizeof(struct unallocSpaceEntry); |
1da177e4 | 379 | elen = 0; |
48d6d8ff | 380 | epos.block = oepos.block = iinfo->i_location; |
ff116fc8 | 381 | epos.bh = oepos.bh = NULL; |
1da177e4 | 382 | |
28de7948 CG |
383 | while (count && |
384 | (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) { | |
4b11111a MS |
385 | if (((eloc.logicalBlockNum + |
386 | (elen >> sb->s_blocksize_bits)) == start)) { | |
387 | if ((0x3FFFFFFF - elen) < | |
388 | (count << sb->s_blocksize_bits)) { | |
389 | uint32_t tmp = ((0x3FFFFFFF - elen) >> | |
390 | sb->s_blocksize_bits); | |
391 | count -= tmp; | |
392 | start += tmp; | |
393 | elen = (etype << 30) | | |
394 | (0x40000000 - sb->s_blocksize); | |
cb00ea35 | 395 | } else { |
4b11111a MS |
396 | elen = (etype << 30) | |
397 | (elen + | |
398 | (count << sb->s_blocksize_bits)); | |
1da177e4 LT |
399 | start += count; |
400 | count = 0; | |
401 | } | |
97e961fd | 402 | udf_write_aext(table, &oepos, &eloc, elen, 1); |
cb00ea35 | 403 | } else if (eloc.logicalBlockNum == (end + 1)) { |
4b11111a MS |
404 | if ((0x3FFFFFFF - elen) < |
405 | (count << sb->s_blocksize_bits)) { | |
406 | uint32_t tmp = ((0x3FFFFFFF - elen) >> | |
407 | sb->s_blocksize_bits); | |
408 | count -= tmp; | |
409 | end -= tmp; | |
410 | eloc.logicalBlockNum -= tmp; | |
411 | elen = (etype << 30) | | |
412 | (0x40000000 - sb->s_blocksize); | |
cb00ea35 | 413 | } else { |
1da177e4 | 414 | eloc.logicalBlockNum = start; |
4b11111a MS |
415 | elen = (etype << 30) | |
416 | (elen + | |
417 | (count << sb->s_blocksize_bits)); | |
1da177e4 LT |
418 | end -= count; |
419 | count = 0; | |
420 | } | |
97e961fd | 421 | udf_write_aext(table, &oepos, &eloc, elen, 1); |
1da177e4 LT |
422 | } |
423 | ||
cb00ea35 | 424 | if (epos.bh != oepos.bh) { |
ff116fc8 | 425 | oepos.block = epos.block; |
3bf25cb4 JK |
426 | brelse(oepos.bh); |
427 | get_bh(epos.bh); | |
ff116fc8 JK |
428 | oepos.bh = epos.bh; |
429 | oepos.offset = 0; | |
28de7948 | 430 | } else { |
ff116fc8 | 431 | oepos.offset = epos.offset; |
28de7948 | 432 | } |
1da177e4 LT |
433 | } |
434 | ||
cb00ea35 | 435 | if (count) { |
28de7948 | 436 | /* |
4b11111a MS |
437 | * NOTE: we CANNOT use udf_add_aext here, as it can try to |
438 | * allocate a new block, and since we hold the super block | |
439 | * lock already very bad things would happen :) | |
28de7948 CG |
440 | * |
441 | * We copy the behavior of udf_add_aext, but instead of | |
442 | * trying to allocate a new block close to the existing one, | |
443 | * we just steal a block from the extent we are trying to add. | |
444 | * | |
445 | * It would be nice if the blocks were close together, but it | |
446 | * isn't required. | |
cb00ea35 | 447 | */ |
1da177e4 LT |
448 | |
449 | int adsize; | |
5ca4e4be PE |
450 | struct short_ad *sad = NULL; |
451 | struct long_ad *lad = NULL; | |
1da177e4 LT |
452 | struct allocExtDesc *aed; |
453 | ||
454 | eloc.logicalBlockNum = start; | |
28de7948 CG |
455 | elen = EXT_RECORDED_ALLOCATED | |
456 | (count << sb->s_blocksize_bits); | |
1da177e4 | 457 | |
48d6d8ff | 458 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
5ca4e4be | 459 | adsize = sizeof(struct short_ad); |
48d6d8ff | 460 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
5ca4e4be | 461 | adsize = sizeof(struct long_ad); |
48d6d8ff | 462 | else { |
3bf25cb4 JK |
463 | brelse(oepos.bh); |
464 | brelse(epos.bh); | |
1da177e4 LT |
465 | goto error_return; |
466 | } | |
467 | ||
cb00ea35 | 468 | if (epos.offset + (2 * adsize) > sb->s_blocksize) { |
391e8bbd | 469 | unsigned char *sptr, *dptr; |
1da177e4 | 470 | int loffset; |
cb00ea35 | 471 | |
3bf25cb4 | 472 | brelse(oepos.bh); |
ff116fc8 | 473 | oepos = epos; |
1da177e4 LT |
474 | |
475 | /* Steal a block from the extent being free'd */ | |
ff116fc8 | 476 | epos.block.logicalBlockNum = eloc.logicalBlockNum; |
cb00ea35 | 477 | eloc.logicalBlockNum++; |
1da177e4 LT |
478 | elen -= sb->s_blocksize; |
479 | ||
4b11111a | 480 | epos.bh = udf_tread(sb, |
97e961fd | 481 | udf_get_lb_pblock(sb, &epos.block, 0)); |
4b11111a | 482 | if (!epos.bh) { |
3bf25cb4 | 483 | brelse(oepos.bh); |
1da177e4 LT |
484 | goto error_return; |
485 | } | |
ff116fc8 | 486 | aed = (struct allocExtDesc *)(epos.bh->b_data); |
4b11111a MS |
487 | aed->previousAllocExtLocation = |
488 | cpu_to_le32(oepos.block.logicalBlockNum); | |
cb00ea35 | 489 | if (epos.offset + adsize > sb->s_blocksize) { |
ff116fc8 | 490 | loffset = epos.offset; |
1da177e4 | 491 | aed->lengthAllocDescs = cpu_to_le32(adsize); |
48d6d8ff | 492 | sptr = iinfo->i_ext.i_data + epos.offset |
c0b34438 | 493 | - adsize; |
4b11111a MS |
494 | dptr = epos.bh->b_data + |
495 | sizeof(struct allocExtDesc); | |
1da177e4 | 496 | memcpy(dptr, sptr, adsize); |
4b11111a MS |
497 | epos.offset = sizeof(struct allocExtDesc) + |
498 | adsize; | |
cb00ea35 | 499 | } else { |
ff116fc8 | 500 | loffset = epos.offset + adsize; |
1da177e4 | 501 | aed->lengthAllocDescs = cpu_to_le32(0); |
cb00ea35 | 502 | if (oepos.bh) { |
f5cc15da | 503 | sptr = oepos.bh->b_data + epos.offset; |
4b11111a MS |
504 | aed = (struct allocExtDesc *) |
505 | oepos.bh->b_data; | |
c2104fda | 506 | le32_add_cpu(&aed->lengthAllocDescs, |
507 | adsize); | |
cb00ea35 | 508 | } else { |
48d6d8ff | 509 | sptr = iinfo->i_ext.i_data + |
c0b34438 | 510 | epos.offset; |
48d6d8ff | 511 | iinfo->i_lenAlloc += adsize; |
1da177e4 LT |
512 | mark_inode_dirty(table); |
513 | } | |
f5cc15da | 514 | epos.offset = sizeof(struct allocExtDesc); |
1da177e4 | 515 | } |
6c79e987 | 516 | if (sbi->s_udfrev >= 0x0200) |
4b11111a MS |
517 | udf_new_tag(epos.bh->b_data, TAG_IDENT_AED, |
518 | 3, 1, epos.block.logicalBlockNum, | |
5ca4e4be | 519 | sizeof(struct tag)); |
1da177e4 | 520 | else |
4b11111a MS |
521 | udf_new_tag(epos.bh->b_data, TAG_IDENT_AED, |
522 | 2, 1, epos.block.logicalBlockNum, | |
5ca4e4be | 523 | sizeof(struct tag)); |
28de7948 | 524 | |
48d6d8ff | 525 | switch (iinfo->i_alloc_type) { |
4b11111a | 526 | case ICBTAG_FLAG_AD_SHORT: |
5ca4e4be | 527 | sad = (struct short_ad *)sptr; |
4b11111a MS |
528 | sad->extLength = cpu_to_le32( |
529 | EXT_NEXT_EXTENT_ALLOCDECS | | |
530 | sb->s_blocksize); | |
531 | sad->extPosition = | |
532 | cpu_to_le32(epos.block.logicalBlockNum); | |
533 | break; | |
534 | case ICBTAG_FLAG_AD_LONG: | |
5ca4e4be | 535 | lad = (struct long_ad *)sptr; |
4b11111a MS |
536 | lad->extLength = cpu_to_le32( |
537 | EXT_NEXT_EXTENT_ALLOCDECS | | |
538 | sb->s_blocksize); | |
539 | lad->extLocation = | |
540 | cpu_to_lelb(epos.block); | |
541 | break; | |
1da177e4 | 542 | } |
cb00ea35 | 543 | if (oepos.bh) { |
ff116fc8 JK |
544 | udf_update_tag(oepos.bh->b_data, loffset); |
545 | mark_buffer_dirty(oepos.bh); | |
28de7948 | 546 | } else { |
1da177e4 | 547 | mark_inode_dirty(table); |
28de7948 | 548 | } |
1da177e4 LT |
549 | } |
550 | ||
4b11111a MS |
551 | /* It's possible that stealing the block emptied the extent */ |
552 | if (elen) { | |
97e961fd | 553 | udf_write_aext(table, &epos, &eloc, elen, 1); |
1da177e4 | 554 | |
cb00ea35 | 555 | if (!epos.bh) { |
48d6d8ff | 556 | iinfo->i_lenAlloc += adsize; |
1da177e4 | 557 | mark_inode_dirty(table); |
cb00ea35 | 558 | } else { |
ff116fc8 | 559 | aed = (struct allocExtDesc *)epos.bh->b_data; |
c2104fda | 560 | le32_add_cpu(&aed->lengthAllocDescs, adsize); |
ff116fc8 JK |
561 | udf_update_tag(epos.bh->b_data, epos.offset); |
562 | mark_buffer_dirty(epos.bh); | |
1da177e4 LT |
563 | } |
564 | } | |
565 | } | |
566 | ||
3bf25cb4 JK |
567 | brelse(epos.bh); |
568 | brelse(oepos.bh); | |
1da177e4 | 569 | |
28de7948 | 570 | error_return: |
1e7933de | 571 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
572 | return; |
573 | } | |
574 | ||
cb00ea35 | 575 | static int udf_table_prealloc_blocks(struct super_block *sb, |
cb00ea35 CG |
576 | struct inode *table, uint16_t partition, |
577 | uint32_t first_block, uint32_t block_count) | |
1da177e4 LT |
578 | { |
579 | struct udf_sb_info *sbi = UDF_SB(sb); | |
580 | int alloc_count = 0; | |
ff116fc8 | 581 | uint32_t elen, adsize; |
5ca4e4be | 582 | struct kernel_lb_addr eloc; |
ff116fc8 | 583 | struct extent_position epos; |
1da177e4 | 584 | int8_t etype = -1; |
48d6d8ff | 585 | struct udf_inode_info *iinfo; |
1da177e4 | 586 | |
3391faa4 | 587 | if (first_block >= sbi->s_partmaps[partition].s_partition_len) |
1da177e4 LT |
588 | return 0; |
589 | ||
48d6d8ff MS |
590 | iinfo = UDF_I(table); |
591 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) | |
5ca4e4be | 592 | adsize = sizeof(struct short_ad); |
48d6d8ff | 593 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
5ca4e4be | 594 | adsize = sizeof(struct long_ad); |
1da177e4 LT |
595 | else |
596 | return 0; | |
597 | ||
1e7933de | 598 | mutex_lock(&sbi->s_alloc_mutex); |
ff116fc8 | 599 | epos.offset = sizeof(struct unallocSpaceEntry); |
48d6d8ff | 600 | epos.block = iinfo->i_location; |
ff116fc8 | 601 | epos.bh = NULL; |
1da177e4 LT |
602 | eloc.logicalBlockNum = 0xFFFFFFFF; |
603 | ||
28de7948 CG |
604 | while (first_block != eloc.logicalBlockNum && |
605 | (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) { | |
1da177e4 | 606 | udf_debug("eloc=%d, elen=%d, first_block=%d\n", |
cb00ea35 | 607 | eloc.logicalBlockNum, elen, first_block); |
28de7948 | 608 | ; /* empty loop body */ |
1da177e4 LT |
609 | } |
610 | ||
cb00ea35 | 611 | if (first_block == eloc.logicalBlockNum) { |
ff116fc8 | 612 | epos.offset -= adsize; |
1da177e4 LT |
613 | |
614 | alloc_count = (elen >> sb->s_blocksize_bits); | |
36350462 | 615 | if (alloc_count > block_count) { |
1da177e4 LT |
616 | alloc_count = block_count; |
617 | eloc.logicalBlockNum += alloc_count; | |
618 | elen -= (alloc_count << sb->s_blocksize_bits); | |
97e961fd | 619 | udf_write_aext(table, &epos, &eloc, |
4b11111a MS |
620 | (etype << 30) | elen, 1); |
621 | } else | |
622 | udf_delete_aext(table, epos, eloc, | |
623 | (etype << 30) | elen); | |
28de7948 | 624 | } else { |
1da177e4 | 625 | alloc_count = 0; |
28de7948 | 626 | } |
1da177e4 | 627 | |
3bf25cb4 | 628 | brelse(epos.bh); |
1da177e4 | 629 | |
146bca72 JK |
630 | if (alloc_count) |
631 | udf_add_free_space(sb, partition, -alloc_count); | |
1e7933de | 632 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
633 | return alloc_count; |
634 | } | |
635 | ||
cb00ea35 | 636 | static int udf_table_new_block(struct super_block *sb, |
cb00ea35 CG |
637 | struct inode *table, uint16_t partition, |
638 | uint32_t goal, int *err) | |
1da177e4 LT |
639 | { |
640 | struct udf_sb_info *sbi = UDF_SB(sb); | |
641 | uint32_t spread = 0xFFFFFFFF, nspread = 0xFFFFFFFF; | |
642 | uint32_t newblock = 0, adsize; | |
ff116fc8 | 643 | uint32_t elen, goal_elen = 0; |
5ca4e4be | 644 | struct kernel_lb_addr eloc, uninitialized_var(goal_eloc); |
ff116fc8 | 645 | struct extent_position epos, goal_epos; |
1da177e4 | 646 | int8_t etype; |
48d6d8ff | 647 | struct udf_inode_info *iinfo = UDF_I(table); |
1da177e4 LT |
648 | |
649 | *err = -ENOSPC; | |
650 | ||
48d6d8ff | 651 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
5ca4e4be | 652 | adsize = sizeof(struct short_ad); |
48d6d8ff | 653 | else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
5ca4e4be | 654 | adsize = sizeof(struct long_ad); |
1da177e4 LT |
655 | else |
656 | return newblock; | |
657 | ||
1e7933de | 658 | mutex_lock(&sbi->s_alloc_mutex); |
3391faa4 | 659 | if (goal >= sbi->s_partmaps[partition].s_partition_len) |
1da177e4 LT |
660 | goal = 0; |
661 | ||
4b11111a MS |
662 | /* We search for the closest matching block to goal. If we find |
663 | a exact hit, we stop. Otherwise we keep going till we run out | |
664 | of extents. We store the buffer_head, bloc, and extoffset | |
665 | of the current closest match and use that when we are done. | |
cb00ea35 | 666 | */ |
ff116fc8 | 667 | epos.offset = sizeof(struct unallocSpaceEntry); |
48d6d8ff | 668 | epos.block = iinfo->i_location; |
ff116fc8 | 669 | epos.bh = goal_epos.bh = NULL; |
1da177e4 | 670 | |
28de7948 CG |
671 | while (spread && |
672 | (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) { | |
cb00ea35 | 673 | if (goal >= eloc.logicalBlockNum) { |
4b11111a MS |
674 | if (goal < eloc.logicalBlockNum + |
675 | (elen >> sb->s_blocksize_bits)) | |
1da177e4 LT |
676 | nspread = 0; |
677 | else | |
678 | nspread = goal - eloc.logicalBlockNum - | |
28de7948 CG |
679 | (elen >> sb->s_blocksize_bits); |
680 | } else { | |
1da177e4 | 681 | nspread = eloc.logicalBlockNum - goal; |
28de7948 | 682 | } |
1da177e4 | 683 | |
cb00ea35 | 684 | if (nspread < spread) { |
1da177e4 | 685 | spread = nspread; |
cb00ea35 | 686 | if (goal_epos.bh != epos.bh) { |
3bf25cb4 | 687 | brelse(goal_epos.bh); |
ff116fc8 | 688 | goal_epos.bh = epos.bh; |
3bf25cb4 | 689 | get_bh(goal_epos.bh); |
1da177e4 | 690 | } |
ff116fc8 JK |
691 | goal_epos.block = epos.block; |
692 | goal_epos.offset = epos.offset - adsize; | |
1da177e4 LT |
693 | goal_eloc = eloc; |
694 | goal_elen = (etype << 30) | elen; | |
695 | } | |
696 | } | |
697 | ||
3bf25cb4 | 698 | brelse(epos.bh); |
1da177e4 | 699 | |
cb00ea35 | 700 | if (spread == 0xFFFFFFFF) { |
3bf25cb4 | 701 | brelse(goal_epos.bh); |
1e7933de | 702 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
703 | return 0; |
704 | } | |
705 | ||
706 | /* Only allocate blocks from the beginning of the extent. | |
707 | That way, we only delete (empty) extents, never have to insert an | |
708 | extent because of splitting */ | |
709 | /* This works, but very poorly.... */ | |
710 | ||
711 | newblock = goal_eloc.logicalBlockNum; | |
cb00ea35 | 712 | goal_eloc.logicalBlockNum++; |
1da177e4 | 713 | goal_elen -= sb->s_blocksize; |
1da177e4 LT |
714 | |
715 | if (goal_elen) | |
97e961fd | 716 | udf_write_aext(table, &goal_epos, &goal_eloc, goal_elen, 1); |
1da177e4 | 717 | else |
ff116fc8 | 718 | udf_delete_aext(table, goal_epos, goal_eloc, goal_elen); |
3bf25cb4 | 719 | brelse(goal_epos.bh); |
1da177e4 | 720 | |
146bca72 | 721 | udf_add_free_space(sb, partition, -1); |
1da177e4 | 722 | |
1e7933de | 723 | mutex_unlock(&sbi->s_alloc_mutex); |
1da177e4 LT |
724 | *err = 0; |
725 | return newblock; | |
726 | } | |
727 | ||
97e961fd PE |
728 | void udf_free_blocks(struct super_block *sb, struct inode *inode, |
729 | struct kernel_lb_addr *bloc, uint32_t offset, | |
730 | uint32_t count) | |
1da177e4 | 731 | { |
97e961fd | 732 | uint16_t partition = bloc->partitionReferenceNum; |
6c79e987 | 733 | struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; |
1da177e4 | 734 | |
6c79e987 | 735 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { |
fd4287db | 736 | udf_bitmap_free_blocks(sb, map->s_uspace.s_bitmap, |
e650b94a | 737 | bloc, offset, count); |
6c79e987 | 738 | } else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { |
fd4287db | 739 | udf_table_free_blocks(sb, map->s_uspace.s_table, |
e650b94a | 740 | bloc, offset, count); |
6c79e987 | 741 | } else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) { |
fd4287db | 742 | udf_bitmap_free_blocks(sb, map->s_fspace.s_bitmap, |
e650b94a | 743 | bloc, offset, count); |
6c79e987 | 744 | } else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) { |
fd4287db | 745 | udf_table_free_blocks(sb, map->s_fspace.s_table, |
e650b94a | 746 | bloc, offset, count); |
28de7948 | 747 | } |
fd4287db JK |
748 | |
749 | if (inode) { | |
750 | inode_sub_bytes(inode, | |
751 | ((sector_t)count) << sb->s_blocksize_bits); | |
752 | } | |
1da177e4 LT |
753 | } |
754 | ||
cb00ea35 CG |
755 | inline int udf_prealloc_blocks(struct super_block *sb, |
756 | struct inode *inode, | |
757 | uint16_t partition, uint32_t first_block, | |
758 | uint32_t block_count) | |
1da177e4 | 759 | { |
6c79e987 | 760 | struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; |
1be440de | 761 | int allocated; |
6c79e987 | 762 | |
4b11111a | 763 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) |
fd4287db JK |
764 | allocated = udf_bitmap_prealloc_blocks(sb, |
765 | map->s_uspace.s_bitmap, | |
766 | partition, first_block, | |
767 | block_count); | |
4b11111a | 768 | else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) |
fd4287db JK |
769 | allocated = udf_table_prealloc_blocks(sb, |
770 | map->s_uspace.s_table, | |
771 | partition, first_block, | |
772 | block_count); | |
4b11111a | 773 | else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) |
fd4287db JK |
774 | allocated = udf_bitmap_prealloc_blocks(sb, |
775 | map->s_fspace.s_bitmap, | |
776 | partition, first_block, | |
777 | block_count); | |
4b11111a | 778 | else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) |
fd4287db JK |
779 | allocated = udf_table_prealloc_blocks(sb, |
780 | map->s_fspace.s_table, | |
781 | partition, first_block, | |
782 | block_count); | |
4b11111a | 783 | else |
1da177e4 | 784 | return 0; |
fd4287db JK |
785 | |
786 | if (inode && allocated > 0) | |
787 | inode_add_bytes(inode, allocated << sb->s_blocksize_bits); | |
788 | return allocated; | |
1da177e4 LT |
789 | } |
790 | ||
cb00ea35 CG |
791 | inline int udf_new_block(struct super_block *sb, |
792 | struct inode *inode, | |
793 | uint16_t partition, uint32_t goal, int *err) | |
1da177e4 | 794 | { |
6c79e987 | 795 | struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; |
fd4287db | 796 | int block; |
3bf25cb4 | 797 | |
4b11111a | 798 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) |
fd4287db JK |
799 | block = udf_bitmap_new_block(sb, |
800 | map->s_uspace.s_bitmap, | |
801 | partition, goal, err); | |
4b11111a | 802 | else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) |
fd4287db JK |
803 | block = udf_table_new_block(sb, |
804 | map->s_uspace.s_table, | |
28de7948 | 805 | partition, goal, err); |
fd4287db JK |
806 | else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) |
807 | block = udf_bitmap_new_block(sb, | |
808 | map->s_fspace.s_bitmap, | |
809 | partition, goal, err); | |
4b11111a | 810 | else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) |
fd4287db JK |
811 | block = udf_table_new_block(sb, |
812 | map->s_fspace.s_table, | |
813 | partition, goal, err); | |
4b11111a | 814 | else { |
1da177e4 LT |
815 | *err = -EIO; |
816 | return 0; | |
817 | } | |
fd4287db JK |
818 | if (inode && block) |
819 | inode_add_bytes(inode, sb->s_blocksize); | |
820 | return block; | |
1da177e4 | 821 | } |