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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / fs / udf / balloc.c
blob6d6a96b4e73fe20ba15edc1213564613cb201bbd
1 /*
2 * balloc.c
3 *
4 * PURPOSE
5 * Block allocation 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) 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
24 #include <linux/bitops.h>
25
26 #include "udf_i.h"
27 #include "udf_sb.h"
28
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
33
34 static int read_block_bitmap(struct super_block *sb,
35 struct udf_bitmap *bitmap, unsigned int block,
36 unsigned long bitmap_nr)
37 {
38 struct buffer_head *bh = NULL;
39 int retval = 0;
40 struct kernel_lb_addr loc;
41
42 loc.logicalBlockNum = bitmap->s_extPosition;
43 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
44
45 bh = udf_tread(sb, udf_get_lb_pblock(sb, &loc, block));
46 if (!bh)
47 retval = -EIO;
48
49 bitmap->s_block_bitmap[bitmap_nr] = bh;
50 return retval;
51 }
52
53 static int __load_block_bitmap(struct super_block *sb,
54 struct udf_bitmap *bitmap,
55 unsigned int block_group)
56 {
57 int retval = 0;
58 int nr_groups = bitmap->s_nr_groups;
59
60 if (block_group >= nr_groups) {
61 udf_debug("block_group (%d) > nr_groups (%d)\n",
62 block_group, nr_groups);
63 }
64
65 if (bitmap->s_block_bitmap[block_group])
66 return block_group;
67
68 retval = read_block_bitmap(sb, bitmap, block_group, block_group);
69 if (retval < 0)
70 return retval;
71
72 return block_group;
73 }
74
75 static inline int load_block_bitmap(struct super_block *sb,
76 struct udf_bitmap *bitmap,
77 unsigned int block_group)
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
92 static void udf_add_free_space(struct super_block *sb, u16 partition, u32 cnt)
93 {
94 struct udf_sb_info *sbi = UDF_SB(sb);
95 struct logicalVolIntegrityDesc *lvid;
96
97 if (!sbi->s_lvid_bh)
98 return;
99
100 lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
101 le32_add_cpu(&lvid->freeSpaceTable[partition], cnt);
102 udf_updated_lvid(sb);
103 }
104
105 static void udf_bitmap_free_blocks(struct super_block *sb,
106 struct udf_bitmap *bitmap,
107 struct kernel_lb_addr *bloc,
108 uint32_t offset,
109 uint32_t count)
110 {
111 struct udf_sb_info *sbi = UDF_SB(sb);
112 struct buffer_head *bh = NULL;
113 struct udf_part_map *partmap;
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
121 mutex_lock(&sbi->s_alloc_mutex);
122 partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
123 if (bloc->logicalBlockNum + count < count ||
124 (bloc->logicalBlockNum + count) > partmap->s_partition_len) {
125 udf_debug("%d < %d || %d + %d > %d\n",
126 bloc->logicalBlockNum, 0,
127 bloc->logicalBlockNum, count,
128 partmap->s_partition_len);
129 goto error_return;
130 }
131
132 block = bloc->logicalBlockNum + offset +
133 (sizeof(struct spaceBitmapDesc) << 3);
134
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;
146 }
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",
156 ((char *)bh->b_data)[(bit + i) >> 3]);
157 }
158 }
159 udf_add_free_space(sb, sbi->s_partition, count);
160 mark_buffer_dirty(bh);
161 if (overflow) {
162 block += count;
163 count = overflow;
164 }
165 } while (overflow);
166
167 error_return:
168 mutex_unlock(&sbi->s_alloc_mutex);
169 }
170
171 static int udf_bitmap_prealloc_blocks(struct super_block *sb,
172 struct udf_bitmap *bitmap,
173 uint16_t partition, uint32_t first_block,
174 uint32_t block_count)
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;
181 __u32 part_len;
182
183 mutex_lock(&sbi->s_alloc_mutex);
184 part_len = sbi->s_partmaps[partition].s_partition_len;
185 if (first_block >= part_len)
186 goto out;
187
188 if (first_block + block_count > part_len)
189 block_count = part_len - first_block;
190
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);
196
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];
201
202 bit = block % (sb->s_blocksize << 3);
203
204 while (bit < (sb->s_blocksize << 3) && block_count > 0) {
205 if (!udf_clear_bit(bit, bh->b_data))
206 goto out;
207 block_count--;
208 alloc_count++;
209 bit++;
210 block++;
211 }
212 mark_buffer_dirty(bh);
213 } while (block_count > 0);
214
215 out:
216 udf_add_free_space(sb, partition, -alloc_count);
217 mutex_unlock(&sbi->s_alloc_mutex);
218 return alloc_count;
219 }
220
221 static int udf_bitmap_new_block(struct super_block *sb,
222 struct udf_bitmap *bitmap, uint16_t partition,
223 uint32_t goal, int *err)
224 {
225 struct udf_sb_info *sbi = UDF_SB(sb);
226 int newbit, bit = 0, block, block_group, group_start;
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;
233 mutex_lock(&sbi->s_alloc_mutex);
234
235 repeat:
236 if (goal >= sbi->s_partmaps[partition].s_partition_len)
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];
248 ptr = memscan((char *)bh->b_data + group_start, 0xFF,
249 sb->s_blocksize - group_start);
250
251 if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) {
252 bit = block % (sb->s_blocksize << 3);
253 if (udf_test_bit(bit, bh->b_data))
254 goto got_block;
255
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;
260
261 ptr = memscan((char *)bh->b_data + (bit >> 3), 0xFF,
262 sb->s_blocksize - ((bit + 7) >> 3));
263 newbit = (ptr - ((char *)bh->b_data)) << 3;
264 if (newbit < sb->s_blocksize << 3) {
265 bit = newbit;
266 goto search_back;
267 }
268
269 newbit = udf_find_next_one_bit(bh->b_data,
270 sb->s_blocksize << 3, bit);
271 if (newbit < sb->s_blocksize << 3) {
272 bit = newbit;
273 goto got_block;
274 }
275 }
276
277 for (i = 0; i < (nr_groups * 2); i++) {
278 block_group++;
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];
287 if (i < nr_groups) {
288 ptr = memscan((char *)bh->b_data + group_start, 0xFF,
289 sb->s_blocksize - group_start);
290 if ((ptr - ((char *)bh->b_data)) < sb->s_blocksize) {
291 bit = (ptr - ((char *)bh->b_data)) << 3;
292 break;
293 }
294 } else {
295 bit = udf_find_next_one_bit(bh->b_data,
296 sb->s_blocksize << 3,
297 group_start << 3);
298 if (bit < sb->s_blocksize << 3)
299 break;
300 }
301 }
302 if (i >= (nr_groups * 2)) {
303 mutex_unlock(&sbi->s_alloc_mutex);
304 return newblock;
305 }
306 if (bit < sb->s_blocksize << 3)
307 goto search_back;
308 else
309 bit = udf_find_next_one_bit(bh->b_data, sb->s_blocksize << 3,
310 group_start << 3);
311 if (bit >= sb->s_blocksize << 3) {
312 mutex_unlock(&sbi->s_alloc_mutex);
313 return 0;
314 }
315
316 search_back:
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 }
323
324 got_block:
325 newblock = bit + (block_group << (sb->s_blocksize_bits + 3)) -
326 (sizeof(struct spaceBitmapDesc) << 3);
327
328 if (!udf_clear_bit(bit, bh->b_data)) {
329 udf_debug("bit already cleared for block %d\n", bit);
330 goto repeat;
331 }
332
333 mark_buffer_dirty(bh);
334
335 udf_add_free_space(sb, partition, -1);
336 mutex_unlock(&sbi->s_alloc_mutex);
337 *err = 0;
338 return newblock;
339
340 error_return:
341 *err = -EIO;
342 mutex_unlock(&sbi->s_alloc_mutex);
343 return 0;
344 }
345
346 static void udf_table_free_blocks(struct super_block *sb,
347 struct inode *table,
348 struct kernel_lb_addr *bloc,
349 uint32_t offset,
350 uint32_t count)
351 {
352 struct udf_sb_info *sbi = UDF_SB(sb);
353 struct udf_part_map *partmap;
354 uint32_t start, end;
355 uint32_t elen;
356 struct kernel_lb_addr eloc;
357 struct extent_position oepos, epos;
358 int8_t etype;
359 struct udf_inode_info *iinfo;
360
361 mutex_lock(&sbi->s_alloc_mutex);
362 partmap = &sbi->s_partmaps[bloc->partitionReferenceNum];
363 if (bloc->logicalBlockNum + count < count ||
364 (bloc->logicalBlockNum + count) > partmap->s_partition_len) {
365 udf_debug("%d < %d || %d + %d > %d\n",
366 bloc->logicalBlockNum, 0,
367 bloc->logicalBlockNum, count,
368 partmap->s_partition_len);
369 goto error_return;
370 }
371
372 iinfo = UDF_I(table);
373 udf_add_free_space(sb, sbi->s_partition, count);
374
375 start = bloc->logicalBlockNum + offset;
376 end = bloc->logicalBlockNum + offset + count - 1;
377
378 epos.offset = oepos.offset = sizeof(struct unallocSpaceEntry);
379 elen = 0;
380 epos.block = oepos.block = iinfo->i_location;
381 epos.bh = oepos.bh = NULL;
382
383 while (count &&
384 (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
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);
395 } else {
396 elen = (etype << 30) |
397 (elen +
398 (count << sb->s_blocksize_bits));
399 start += count;
400 count = 0;
401 }
402 udf_write_aext(table, &oepos, &eloc, elen, 1);
403 } else if (eloc.logicalBlockNum == (end + 1)) {
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);
413 } else {
414 eloc.logicalBlockNum = start;
415 elen = (etype << 30) |
416 (elen +
417 (count << sb->s_blocksize_bits));
418 end -= count;
419 count = 0;
420 }
421 udf_write_aext(table, &oepos, &eloc, elen, 1);
422 }
423
424 if (epos.bh != oepos.bh) {
425 oepos.block = epos.block;
426 brelse(oepos.bh);
427 get_bh(epos.bh);
428 oepos.bh = epos.bh;
429 oepos.offset = 0;
430 } else {
431 oepos.offset = epos.offset;
432 }
433 }
434
435 if (count) {
436 /*
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 :)
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.
447 */
448
449 int adsize;
450 struct short_ad *sad = NULL;
451 struct long_ad *lad = NULL;
452 struct allocExtDesc *aed;
453
454 eloc.logicalBlockNum = start;
455 elen = EXT_RECORDED_ALLOCATED |
456 (count << sb->s_blocksize_bits);
457
458 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
459 adsize = sizeof(struct short_ad);
460 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
461 adsize = sizeof(struct long_ad);
462 else {
463 brelse(oepos.bh);
464 brelse(epos.bh);
465 goto error_return;
466 }
467
468 if (epos.offset + (2 * adsize) > sb->s_blocksize) {
469 unsigned char *sptr, *dptr;
470 int loffset;
471
472 brelse(oepos.bh);
473 oepos = epos;
474
475 /* Steal a block from the extent being free'd */
476 epos.block.logicalBlockNum = eloc.logicalBlockNum;
477 eloc.logicalBlockNum++;
478 elen -= sb->s_blocksize;
479
480 epos.bh = udf_tread(sb,
481 udf_get_lb_pblock(sb, &epos.block, 0));
482 if (!epos.bh) {
483 brelse(oepos.bh);
484 goto error_return;
485 }
486 aed = (struct allocExtDesc *)(epos.bh->b_data);
487 aed->previousAllocExtLocation =
488 cpu_to_le32(oepos.block.logicalBlockNum);
489 if (epos.offset + adsize > sb->s_blocksize) {
490 loffset = epos.offset;
491 aed->lengthAllocDescs = cpu_to_le32(adsize);
492 sptr = iinfo->i_ext.i_data + epos.offset
493 - adsize;
494 dptr = epos.bh->b_data +
495 sizeof(struct allocExtDesc);
496 memcpy(dptr, sptr, adsize);
497 epos.offset = sizeof(struct allocExtDesc) +
498 adsize;
499 } else {
500 loffset = epos.offset + adsize;
501 aed->lengthAllocDescs = cpu_to_le32(0);
502 if (oepos.bh) {
503 sptr = oepos.bh->b_data + epos.offset;
504 aed = (struct allocExtDesc *)
505 oepos.bh->b_data;
506 le32_add_cpu(&aed->lengthAllocDescs,
507 adsize);
508 } else {
509 sptr = iinfo->i_ext.i_data +
510 epos.offset;
511 iinfo->i_lenAlloc += adsize;
512 mark_inode_dirty(table);
513 }
514 epos.offset = sizeof(struct allocExtDesc);
515 }
516 if (sbi->s_udfrev >= 0x0200)
517 udf_new_tag(epos.bh->b_data, TAG_IDENT_AED,
518 3, 1, epos.block.logicalBlockNum,
519 sizeof(struct tag));
520 else
521 udf_new_tag(epos.bh->b_data, TAG_IDENT_AED,
522 2, 1, epos.block.logicalBlockNum,
523 sizeof(struct tag));
524
525 switch (iinfo->i_alloc_type) {
526 case ICBTAG_FLAG_AD_SHORT:
527 sad = (struct short_ad *)sptr;
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:
535 lad = (struct long_ad *)sptr;
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;
542 }
543 if (oepos.bh) {
544 udf_update_tag(oepos.bh->b_data, loffset);
545 mark_buffer_dirty(oepos.bh);
546 } else {
547 mark_inode_dirty(table);
548 }
549 }
550
551 /* It's possible that stealing the block emptied the extent */
552 if (elen) {
553 udf_write_aext(table, &epos, &eloc, elen, 1);
554
555 if (!epos.bh) {
556 iinfo->i_lenAlloc += adsize;
557 mark_inode_dirty(table);
558 } else {
559 aed = (struct allocExtDesc *)epos.bh->b_data;
560 le32_add_cpu(&aed->lengthAllocDescs, adsize);
561 udf_update_tag(epos.bh->b_data, epos.offset);
562 mark_buffer_dirty(epos.bh);
563 }
564 }
565 }
566
567 brelse(epos.bh);
568 brelse(oepos.bh);
569
570 error_return:
571 mutex_unlock(&sbi->s_alloc_mutex);
572 return;
573 }
574
575 static int udf_table_prealloc_blocks(struct super_block *sb,
576 struct inode *table, uint16_t partition,
577 uint32_t first_block, uint32_t block_count)
578 {
579 struct udf_sb_info *sbi = UDF_SB(sb);
580 int alloc_count = 0;
581 uint32_t elen, adsize;
582 struct kernel_lb_addr eloc;
583 struct extent_position epos;
584 int8_t etype = -1;
585 struct udf_inode_info *iinfo;
586
587 if (first_block >= sbi->s_partmaps[partition].s_partition_len)
588 return 0;
589
590 iinfo = UDF_I(table);
591 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
592 adsize = sizeof(struct short_ad);
593 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
594 adsize = sizeof(struct long_ad);
595 else
596 return 0;
597
598 mutex_lock(&sbi->s_alloc_mutex);
599 epos.offset = sizeof(struct unallocSpaceEntry);
600 epos.block = iinfo->i_location;
601 epos.bh = NULL;
602 eloc.logicalBlockNum = 0xFFFFFFFF;
603
604 while (first_block != eloc.logicalBlockNum &&
605 (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
606 udf_debug("eloc=%d, elen=%d, first_block=%d\n",
607 eloc.logicalBlockNum, elen, first_block);
608 ; /* empty loop body */
609 }
610
611 if (first_block == eloc.logicalBlockNum) {
612 epos.offset -= adsize;
613
614 alloc_count = (elen >> sb->s_blocksize_bits);
615 if (alloc_count > block_count) {
616 alloc_count = block_count;
617 eloc.logicalBlockNum += alloc_count;
618 elen -= (alloc_count << sb->s_blocksize_bits);
619 udf_write_aext(table, &epos, &eloc,
620 (etype << 30) | elen, 1);
621 } else
622 udf_delete_aext(table, epos, eloc,
623 (etype << 30) | elen);
624 } else {
625 alloc_count = 0;
626 }
627
628 brelse(epos.bh);
629
630 if (alloc_count)
631 udf_add_free_space(sb, partition, -alloc_count);
632 mutex_unlock(&sbi->s_alloc_mutex);
633 return alloc_count;
634 }
635
636 static int udf_table_new_block(struct super_block *sb,
637 struct inode *table, uint16_t partition,
638 uint32_t goal, int *err)
639 {
640 struct udf_sb_info *sbi = UDF_SB(sb);
641 uint32_t spread = 0xFFFFFFFF, nspread = 0xFFFFFFFF;
642 uint32_t newblock = 0, adsize;
643 uint32_t elen, goal_elen = 0;
644 struct kernel_lb_addr eloc, uninitialized_var(goal_eloc);
645 struct extent_position epos, goal_epos;
646 int8_t etype;
647 struct udf_inode_info *iinfo = UDF_I(table);
648
649 *err = -ENOSPC;
650
651 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
652 adsize = sizeof(struct short_ad);
653 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
654 adsize = sizeof(struct long_ad);
655 else
656 return newblock;
657
658 mutex_lock(&sbi->s_alloc_mutex);
659 if (goal >= sbi->s_partmaps[partition].s_partition_len)
660 goal = 0;
661
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.
666 */
667 epos.offset = sizeof(struct unallocSpaceEntry);
668 epos.block = iinfo->i_location;
669 epos.bh = goal_epos.bh = NULL;
670
671 while (spread &&
672 (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
673 if (goal >= eloc.logicalBlockNum) {
674 if (goal < eloc.logicalBlockNum +
675 (elen >> sb->s_blocksize_bits))
676 nspread = 0;
677 else
678 nspread = goal - eloc.logicalBlockNum -
679 (elen >> sb->s_blocksize_bits);
680 } else {
681 nspread = eloc.logicalBlockNum - goal;
682 }
683
684 if (nspread < spread) {
685 spread = nspread;
686 if (goal_epos.bh != epos.bh) {
687 brelse(goal_epos.bh);
688 goal_epos.bh = epos.bh;
689 get_bh(goal_epos.bh);
690 }
691 goal_epos.block = epos.block;
692 goal_epos.offset = epos.offset - adsize;
693 goal_eloc = eloc;
694 goal_elen = (etype << 30) | elen;
695 }
696 }
697
698 brelse(epos.bh);
699
700 if (spread == 0xFFFFFFFF) {
701 brelse(goal_epos.bh);
702 mutex_unlock(&sbi->s_alloc_mutex);
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;
712 goal_eloc.logicalBlockNum++;
713 goal_elen -= sb->s_blocksize;
714
715 if (goal_elen)
716 udf_write_aext(table, &goal_epos, &goal_eloc, goal_elen, 1);
717 else
718 udf_delete_aext(table, goal_epos, goal_eloc, goal_elen);
719 brelse(goal_epos.bh);
720
721 udf_add_free_space(sb, partition, -1);
722
723 mutex_unlock(&sbi->s_alloc_mutex);
724 *err = 0;
725 return newblock;
726 }
727
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)
731 {
732 uint16_t partition = bloc->partitionReferenceNum;
733 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
734
735 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
736 udf_bitmap_free_blocks(sb, map->s_uspace.s_bitmap,
737 bloc, offset, count);
738 } else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
739 udf_table_free_blocks(sb, map->s_uspace.s_table,
740 bloc, offset, count);
741 } else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
742 udf_bitmap_free_blocks(sb, map->s_fspace.s_bitmap,
743 bloc, offset, count);
744 } else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
745 udf_table_free_blocks(sb, map->s_fspace.s_table,
746 bloc, offset, count);
747 }
748
749 if (inode) {
750 inode_sub_bytes(inode,
751 ((sector_t)count) << sb->s_blocksize_bits);
752 }
753 }
754
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)
759 {
760 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
761 int allocated;
762
763 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
764 allocated = udf_bitmap_prealloc_blocks(sb,
765 map->s_uspace.s_bitmap,
766 partition, first_block,
767 block_count);
768 else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
769 allocated = udf_table_prealloc_blocks(sb,
770 map->s_uspace.s_table,
771 partition, first_block,
772 block_count);
773 else if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
774 allocated = udf_bitmap_prealloc_blocks(sb,
775 map->s_fspace.s_bitmap,
776 partition, first_block,
777 block_count);
778 else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
779 allocated = udf_table_prealloc_blocks(sb,
780 map->s_fspace.s_table,
781 partition, first_block,
782 block_count);
783 else
784 return 0;
785
786 if (inode && allocated > 0)
787 inode_add_bytes(inode, allocated << sb->s_blocksize_bits);
788 return allocated;
789 }
790
791 inline int udf_new_block(struct super_block *sb,
792 struct inode *inode,
793 uint16_t partition, uint32_t goal, int *err)
794 {
795 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
796 int block;
797
798 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
799 block = udf_bitmap_new_block(sb,
800 map->s_uspace.s_bitmap,
801 partition, goal, err);
802 else if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
803 block = udf_table_new_block(sb,
804 map->s_uspace.s_table,
805 partition, goal, err);
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);
810 else if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
811 block = udf_table_new_block(sb,
812 map->s_fspace.s_table,
813 partition, goal, err);
814 else {
815 *err = -EIO;
816 return 0;
817 }
818 if (inode && block)
819 inode_add_bytes(inode, sb->s_blocksize);
820 return block;
821 }
Linux with added FPC-III support