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replace some function names
[linux-2.6/zen-sources.git] / fs / udf / inode.c
blob30ebde490f7f5ebc3a4b79331191706c180b5a8f
1 /*
2 * inode.c
3 *
4 * PURPOSE
5 * Inode 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 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
16 *
17 * HISTORY
18 *
19 * 10/04/98 dgb Added rudimentary directory functions
20 * 10/07/98 Fully working udf_block_map! It works!
21 * 11/25/98 bmap altered to better support extents
22 * 12/06/98 blf partition support in udf_iget, udf_block_map
23 * and udf_read_inode
24 * 12/12/98 rewrote udf_block_map to handle next extents and descs across
25 * block boundaries (which is not actually allowed)
26 * 12/20/98 added support for strategy 4096
27 * 03/07/99 rewrote udf_block_map (again)
28 * New funcs, inode_bmap, udf_next_aext
29 * 04/19/99 Support for writing device EA's for major/minor #
30 */
31
32 #include "udfdecl.h"
33 #include <linux/mm.h>
34 #include <linux/smp_lock.h>
35 #include <linux/module.h>
36 #include <linux/pagemap.h>
37 #include <linux/buffer_head.h>
38 #include <linux/writeback.h>
39 #include <linux/slab.h>
40 #include <linux/crc-itu-t.h>
41
42 #include "udf_i.h"
43 #include "udf_sb.h"
44
45 MODULE_AUTHOR("Ben Fennema");
46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
47 MODULE_LICENSE("GPL");
48
49 #define EXTENT_MERGE_SIZE 5
50
51 static mode_t udf_convert_permissions(struct fileEntry *);
52 static int udf_update_inode(struct inode *, int);
53 static void udf_fill_inode(struct inode *, struct buffer_head *);
54 static int udf_alloc_i_data(struct inode *inode, size_t size);
55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
56 sector_t *, int *);
57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
58 kernel_lb_addr, uint32_t);
59 static void udf_split_extents(struct inode *, int *, int, int,
60 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
61 static void udf_prealloc_extents(struct inode *, int, int,
62 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
63 static void udf_merge_extents(struct inode *,
64 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
65 static void udf_update_extents(struct inode *,
66 kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
67 struct extent_position *);
68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
69
70
71 void udf_delete_inode(struct inode *inode)
72 {
73 truncate_inode_pages(&inode->i_data, 0);
74
75 if (is_bad_inode(inode))
76 goto no_delete;
77
78 inode->i_size = 0;
79 udf_truncate(inode);
80 lock_kernel();
81
82 udf_update_inode(inode, IS_SYNC(inode));
83 udf_free_inode(inode);
84
85 unlock_kernel();
86 return;
87
88 no_delete:
89 clear_inode(inode);
90 }
91
92 /*
93 * If we are going to release inode from memory, we discard preallocation and
94 * truncate last inode extent to proper length. We could use drop_inode() but
95 * it's called under inode_lock and thus we cannot mark inode dirty there. We
96 * use clear_inode() but we have to make sure to write inode as it's not written
97 * automatically.
98 */
99 void udf_clear_inode(struct inode *inode)
100 {
101 struct udf_inode_info *iinfo;
102 if (!(inode->i_sb->s_flags & MS_RDONLY)) {
103 lock_kernel();
104 /* Discard preallocation for directories, symlinks, etc. */
105 udf_discard_prealloc(inode);
106 udf_truncate_tail_extent(inode);
107 unlock_kernel();
108 write_inode_now(inode, 0);
109 invalidate_inode_buffers(inode);
110 }
111 iinfo = UDF_I(inode);
112 kfree(iinfo->i_ext.i_data);
113 iinfo->i_ext.i_data = NULL;
114 }
115
116 static int udf_writepage(struct page *page, struct writeback_control *wbc)
117 {
118 return block_write_full_page(page, udf_get_block, wbc);
119 }
120
121 static int udf_readpage(struct file *file, struct page *page)
122 {
123 return block_read_full_page(page, udf_get_block);
124 }
125
126 static int udf_write_begin(struct file *file, struct address_space *mapping,
127 loff_t pos, unsigned len, unsigned flags,
128 struct page **pagep, void **fsdata)
129 {
130 *pagep = NULL;
131 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
132 udf_get_block);
133 }
134
135 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
136 {
137 return generic_block_bmap(mapping, block, udf_get_block);
138 }
139
140 const struct address_space_operations udf_aops = {
141 .readpage = udf_readpage,
142 .writepage = udf_writepage,
143 .sync_page = block_sync_page,
144 .write_begin = udf_write_begin,
145 .write_end = generic_write_end,
146 .bmap = udf_bmap,
147 };
148
149 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
150 {
151 struct page *page;
152 char *kaddr;
153 struct udf_inode_info *iinfo = UDF_I(inode);
154 struct writeback_control udf_wbc = {
155 .sync_mode = WB_SYNC_NONE,
156 .nr_to_write = 1,
157 };
158
159 /* from now on we have normal address_space methods */
160 inode->i_data.a_ops = &udf_aops;
161
162 if (!iinfo->i_lenAlloc) {
163 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
164 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
165 else
166 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
167 mark_inode_dirty(inode);
168 return;
169 }
170
171 page = grab_cache_page(inode->i_mapping, 0);
172 BUG_ON(!PageLocked(page));
173
174 if (!PageUptodate(page)) {
175 kaddr = kmap(page);
176 memset(kaddr + iinfo->i_lenAlloc, 0x00,
177 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
178 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
179 iinfo->i_lenAlloc);
180 flush_dcache_page(page);
181 SetPageUptodate(page);
182 kunmap(page);
183 }
184 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
185 iinfo->i_lenAlloc);
186 iinfo->i_lenAlloc = 0;
187 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
188 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
189 else
190 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
191
192 inode->i_data.a_ops->writepage(page, &udf_wbc);
193 page_cache_release(page);
194
195 mark_inode_dirty(inode);
196 }
197
198 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
199 int *err)
200 {
201 int newblock;
202 struct buffer_head *dbh = NULL;
203 kernel_lb_addr eloc;
204 uint32_t elen;
205 uint8_t alloctype;
206 struct extent_position epos;
207
208 struct udf_fileident_bh sfibh, dfibh;
209 loff_t f_pos = udf_ext0_offset(inode);
210 int size = udf_ext0_offset(inode) + inode->i_size;
211 struct fileIdentDesc cfi, *sfi, *dfi;
212 struct udf_inode_info *iinfo = UDF_I(inode);
213
214 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
215 alloctype = ICBTAG_FLAG_AD_SHORT;
216 else
217 alloctype = ICBTAG_FLAG_AD_LONG;
218
219 if (!inode->i_size) {
220 iinfo->i_alloc_type = alloctype;
221 mark_inode_dirty(inode);
222 return NULL;
223 }
224
225 /* alloc block, and copy data to it */
226 *block = udf_new_block(inode->i_sb, inode,
227 iinfo->i_location.partitionReferenceNum,
228 iinfo->i_location.logicalBlockNum, err);
229 if (!(*block))
230 return NULL;
231 newblock = udf_get_pblock(inode->i_sb, *block,
232 iinfo->i_location.partitionReferenceNum,
233 0);
234 if (!newblock)
235 return NULL;
236 dbh = udf_tgetblk(inode->i_sb, newblock);
237 if (!dbh)
238 return NULL;
239 lock_buffer(dbh);
240 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
241 set_buffer_uptodate(dbh);
242 unlock_buffer(dbh);
243 mark_buffer_dirty_inode(dbh, inode);
244
245 sfibh.soffset = sfibh.eoffset =
246 f_pos & (inode->i_sb->s_blocksize - 1);
247 sfibh.sbh = sfibh.ebh = NULL;
248 dfibh.soffset = dfibh.eoffset = 0;
249 dfibh.sbh = dfibh.ebh = dbh;
250 while (f_pos < size) {
251 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
252 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
253 NULL, NULL, NULL);
254 if (!sfi) {
255 brelse(dbh);
256 return NULL;
257 }
258 iinfo->i_alloc_type = alloctype;
259 sfi->descTag.tagLocation = cpu_to_le32(*block);
260 dfibh.soffset = dfibh.eoffset;
261 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
262 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
263 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
264 sfi->fileIdent +
265 le16_to_cpu(sfi->lengthOfImpUse))) {
266 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
267 brelse(dbh);
268 return NULL;
269 }
270 }
271 mark_buffer_dirty_inode(dbh, inode);
272
273 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
274 iinfo->i_lenAlloc);
275 iinfo->i_lenAlloc = 0;
276 eloc.logicalBlockNum = *block;
277 eloc.partitionReferenceNum =
278 iinfo->i_location.partitionReferenceNum;
279 elen = inode->i_sb->s_blocksize;
280 iinfo->i_lenExtents = elen;
281 epos.bh = NULL;
282 epos.block = iinfo->i_location;
283 epos.offset = udf_file_entry_alloc_offset(inode);
284 udf_add_aext(inode, &epos, eloc, elen, 0);
285 /* UniqueID stuff */
286
287 brelse(epos.bh);
288 mark_inode_dirty(inode);
289 return dbh;
290 }
291
292 static int udf_get_block(struct inode *inode, sector_t block,
293 struct buffer_head *bh_result, int create)
294 {
295 int err, new;
296 struct buffer_head *bh;
297 sector_t phys = 0;
298 struct udf_inode_info *iinfo;
299
300 if (!create) {
301 phys = udf_block_map(inode, block);
302 if (phys)
303 map_bh(bh_result, inode->i_sb, phys);
304 return 0;
305 }
306
307 err = -EIO;
308 new = 0;
309 bh = NULL;
310
311 lock_kernel();
312
313 iinfo = UDF_I(inode);
314 if (block == iinfo->i_next_alloc_block + 1) {
315 iinfo->i_next_alloc_block++;
316 iinfo->i_next_alloc_goal++;
317 }
318
319 err = 0;
320
321 bh = inode_getblk(inode, block, &err, &phys, &new);
322 BUG_ON(bh);
323 if (err)
324 goto abort;
325 BUG_ON(!phys);
326
327 if (new)
328 set_buffer_new(bh_result);
329 map_bh(bh_result, inode->i_sb, phys);
330
331 abort:
332 unlock_kernel();
333 return err;
334 }
335
336 static struct buffer_head *udf_getblk(struct inode *inode, long block,
337 int create, int *err)
338 {
339 struct buffer_head *bh;
340 struct buffer_head dummy;
341
342 dummy.b_state = 0;
343 dummy.b_blocknr = -1000;
344 *err = udf_get_block(inode, block, &dummy, create);
345 if (!*err && buffer_mapped(&dummy)) {
346 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
347 if (buffer_new(&dummy)) {
348 lock_buffer(bh);
349 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
350 set_buffer_uptodate(bh);
351 unlock_buffer(bh);
352 mark_buffer_dirty_inode(bh, inode);
353 }
354 return bh;
355 }
356
357 return NULL;
358 }
359
360 /* Extend the file by 'blocks' blocks, return the number of extents added */
361 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
362 kernel_long_ad *last_ext, sector_t blocks)
363 {
364 sector_t add;
365 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
366 struct super_block *sb = inode->i_sb;
367 kernel_lb_addr prealloc_loc = {};
368 int prealloc_len = 0;
369 struct udf_inode_info *iinfo;
370
371 /* The previous extent is fake and we should not extend by anything
372 * - there's nothing to do... */
373 if (!blocks && fake)
374 return 0;
375
376 iinfo = UDF_I(inode);
377 /* Round the last extent up to a multiple of block size */
378 if (last_ext->extLength & (sb->s_blocksize - 1)) {
379 last_ext->extLength =
380 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
381 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
382 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
383 iinfo->i_lenExtents =
384 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
385 ~(sb->s_blocksize - 1);
386 }
387
388 /* Last extent are just preallocated blocks? */
389 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
390 EXT_NOT_RECORDED_ALLOCATED) {
391 /* Save the extent so that we can reattach it to the end */
392 prealloc_loc = last_ext->extLocation;
393 prealloc_len = last_ext->extLength;
394 /* Mark the extent as a hole */
395 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
396 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
397 last_ext->extLocation.logicalBlockNum = 0;
398 last_ext->extLocation.partitionReferenceNum = 0;
399 }
400
401 /* Can we merge with the previous extent? */
402 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
403 EXT_NOT_RECORDED_NOT_ALLOCATED) {
404 add = ((1 << 30) - sb->s_blocksize -
405 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
406 sb->s_blocksize_bits;
407 if (add > blocks)
408 add = blocks;
409 blocks -= add;
410 last_ext->extLength += add << sb->s_blocksize_bits;
411 }
412
413 if (fake) {
414 udf_add_aext(inode, last_pos, last_ext->extLocation,
415 last_ext->extLength, 1);
416 count++;
417 } else
418 udf_write_aext(inode, last_pos, last_ext->extLocation,
419 last_ext->extLength, 1);
420
421 /* Managed to do everything necessary? */
422 if (!blocks)
423 goto out;
424
425 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
426 last_ext->extLocation.logicalBlockNum = 0;
427 last_ext->extLocation.partitionReferenceNum = 0;
428 add = (1 << (30-sb->s_blocksize_bits)) - 1;
429 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
430 (add << sb->s_blocksize_bits);
431
432 /* Create enough extents to cover the whole hole */
433 while (blocks > add) {
434 blocks -= add;
435 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
436 last_ext->extLength, 1) == -1)
437 return -1;
438 count++;
439 }
440 if (blocks) {
441 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
442 (blocks << sb->s_blocksize_bits);
443 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
444 last_ext->extLength, 1) == -1)
445 return -1;
446 count++;
447 }
448
449 out:
450 /* Do we have some preallocated blocks saved? */
451 if (prealloc_len) {
452 if (udf_add_aext(inode, last_pos, prealloc_loc,
453 prealloc_len, 1) == -1)
454 return -1;
455 last_ext->extLocation = prealloc_loc;
456 last_ext->extLength = prealloc_len;
457 count++;
458 }
459
460 /* last_pos should point to the last written extent... */
461 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
462 last_pos->offset -= sizeof(short_ad);
463 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
464 last_pos->offset -= sizeof(long_ad);
465 else
466 return -1;
467
468 return count;
469 }
470
471 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
472 int *err, sector_t *phys, int *new)
473 {
474 static sector_t last_block;
475 struct buffer_head *result = NULL;
476 kernel_long_ad laarr[EXTENT_MERGE_SIZE];
477 struct extent_position prev_epos, cur_epos, next_epos;
478 int count = 0, startnum = 0, endnum = 0;
479 uint32_t elen = 0, tmpelen;
480 kernel_lb_addr eloc, tmpeloc;
481 int c = 1;
482 loff_t lbcount = 0, b_off = 0;
483 uint32_t newblocknum, newblock;
484 sector_t offset = 0;
485 int8_t etype;
486 struct udf_inode_info *iinfo = UDF_I(inode);
487 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
488 int lastblock = 0;
489
490 prev_epos.offset = udf_file_entry_alloc_offset(inode);
491 prev_epos.block = iinfo->i_location;
492 prev_epos.bh = NULL;
493 cur_epos = next_epos = prev_epos;
494 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
495
496 /* find the extent which contains the block we are looking for.
497 alternate between laarr[0] and laarr[1] for locations of the
498 current extent, and the previous extent */
499 do {
500 if (prev_epos.bh != cur_epos.bh) {
501 brelse(prev_epos.bh);
502 get_bh(cur_epos.bh);
503 prev_epos.bh = cur_epos.bh;
504 }
505 if (cur_epos.bh != next_epos.bh) {
506 brelse(cur_epos.bh);
507 get_bh(next_epos.bh);
508 cur_epos.bh = next_epos.bh;
509 }
510
511 lbcount += elen;
512
513 prev_epos.block = cur_epos.block;
514 cur_epos.block = next_epos.block;
515
516 prev_epos.offset = cur_epos.offset;
517 cur_epos.offset = next_epos.offset;
518
519 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
520 if (etype == -1)
521 break;
522
523 c = !c;
524
525 laarr[c].extLength = (etype << 30) | elen;
526 laarr[c].extLocation = eloc;
527
528 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
529 pgoal = eloc.logicalBlockNum +
530 ((elen + inode->i_sb->s_blocksize - 1) >>
531 inode->i_sb->s_blocksize_bits);
532
533 count++;
534 } while (lbcount + elen <= b_off);
535
536 b_off -= lbcount;
537 offset = b_off >> inode->i_sb->s_blocksize_bits;
538 /*
539 * Move prev_epos and cur_epos into indirect extent if we are at
540 * the pointer to it
541 */
542 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
543 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
544
545 /* if the extent is allocated and recorded, return the block
546 if the extent is not a multiple of the blocksize, round up */
547
548 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
549 if (elen & (inode->i_sb->s_blocksize - 1)) {
550 elen = EXT_RECORDED_ALLOCATED |
551 ((elen + inode->i_sb->s_blocksize - 1) &
552 ~(inode->i_sb->s_blocksize - 1));
553 etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
554 }
555 brelse(prev_epos.bh);
556 brelse(cur_epos.bh);
557 brelse(next_epos.bh);
558 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
559 *phys = newblock;
560 return NULL;
561 }
562
563 last_block = block;
564 /* Are we beyond EOF? */
565 if (etype == -1) {
566 int ret;
567
568 if (count) {
569 if (c)
570 laarr[0] = laarr[1];
571 startnum = 1;
572 } else {
573 /* Create a fake extent when there's not one */
574 memset(&laarr[0].extLocation, 0x00,
575 sizeof(kernel_lb_addr));
576 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
577 /* Will udf_extend_file() create real extent from
578 a fake one? */
579 startnum = (offset > 0);
580 }
581 /* Create extents for the hole between EOF and offset */
582 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
583 if (ret == -1) {
584 brelse(prev_epos.bh);
585 brelse(cur_epos.bh);
586 brelse(next_epos.bh);
587 /* We don't really know the error here so we just make
588 * something up */
589 *err = -ENOSPC;
590 return NULL;
591 }
592 c = 0;
593 offset = 0;
594 count += ret;
595 /* We are not covered by a preallocated extent? */
596 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
597 EXT_NOT_RECORDED_ALLOCATED) {
598 /* Is there any real extent? - otherwise we overwrite
599 * the fake one... */
600 if (count)
601 c = !c;
602 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
603 inode->i_sb->s_blocksize;
604 memset(&laarr[c].extLocation, 0x00,
605 sizeof(kernel_lb_addr));
606 count++;
607 endnum++;
608 }
609 endnum = c + 1;
610 lastblock = 1;
611 } else {
612 endnum = startnum = ((count > 2) ? 2 : count);
613
614 /* if the current extent is in position 0,
615 swap it with the previous */
616 if (!c && count != 1) {
617 laarr[2] = laarr[0];
618 laarr[0] = laarr[1];
619 laarr[1] = laarr[2];
620 c = 1;
621 }
622
623 /* if the current block is located in an extent,
624 read the next extent */
625 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
626 if (etype != -1) {
627 laarr[c + 1].extLength = (etype << 30) | elen;
628 laarr[c + 1].extLocation = eloc;
629 count++;
630 startnum++;
631 endnum++;
632 } else
633 lastblock = 1;
634 }
635
636 /* if the current extent is not recorded but allocated, get the
637 * block in the extent corresponding to the requested block */
638 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
639 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
640 else { /* otherwise, allocate a new block */
641 if (iinfo->i_next_alloc_block == block)
642 goal = iinfo->i_next_alloc_goal;
643
644 if (!goal) {
645 if (!(goal = pgoal)) /* XXX: what was intended here? */
646 goal = iinfo->i_location.logicalBlockNum + 1;
647 }
648
649 newblocknum = udf_new_block(inode->i_sb, inode,
650 iinfo->i_location.partitionReferenceNum,
651 goal, err);
652 if (!newblocknum) {
653 brelse(prev_epos.bh);
654 *err = -ENOSPC;
655 return NULL;
656 }
657 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
658 }
659
660 /* if the extent the requsted block is located in contains multiple
661 * blocks, split the extent into at most three extents. blocks prior
662 * to requested block, requested block, and blocks after requested
663 * block */
664 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
665
666 #ifdef UDF_PREALLOCATE
667 /* preallocate blocks */
668 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
669 #endif
670
671 /* merge any continuous blocks in laarr */
672 udf_merge_extents(inode, laarr, &endnum);
673
674 /* write back the new extents, inserting new extents if the new number
675 * of extents is greater than the old number, and deleting extents if
676 * the new number of extents is less than the old number */
677 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
678
679 brelse(prev_epos.bh);
680
681 newblock = udf_get_pblock(inode->i_sb, newblocknum,
682 iinfo->i_location.partitionReferenceNum, 0);
683 if (!newblock)
684 return NULL;
685 *phys = newblock;
686 *err = 0;
687 *new = 1;
688 iinfo->i_next_alloc_block = block;
689 iinfo->i_next_alloc_goal = newblocknum;
690 inode->i_ctime = current_fs_time(inode->i_sb);
691
692 if (IS_SYNC(inode))
693 udf_sync_inode(inode);
694 else
695 mark_inode_dirty(inode);
696
697 return result;
698 }
699
700 static void udf_split_extents(struct inode *inode, int *c, int offset,
701 int newblocknum,
702 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
703 int *endnum)
704 {
705 unsigned long blocksize = inode->i_sb->s_blocksize;
706 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
707
708 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
709 (laarr[*c].extLength >> 30) ==
710 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
711 int curr = *c;
712 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
713 blocksize - 1) >> blocksize_bits;
714 int8_t etype = (laarr[curr].extLength >> 30);
715
716 if (blen == 1)
717 ;
718 else if (!offset || blen == offset + 1) {
719 laarr[curr + 2] = laarr[curr + 1];
720 laarr[curr + 1] = laarr[curr];
721 } else {
722 laarr[curr + 3] = laarr[curr + 1];
723 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
724 }
725
726 if (offset) {
727 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
728 udf_free_blocks(inode->i_sb, inode,
729 laarr[curr].extLocation,
730 0, offset);
731 laarr[curr].extLength =
732 EXT_NOT_RECORDED_NOT_ALLOCATED |
733 (offset << blocksize_bits);
734 laarr[curr].extLocation.logicalBlockNum = 0;
735 laarr[curr].extLocation.
736 partitionReferenceNum = 0;
737 } else
738 laarr[curr].extLength = (etype << 30) |
739 (offset << blocksize_bits);
740 curr++;
741 (*c)++;
742 (*endnum)++;
743 }
744
745 laarr[curr].extLocation.logicalBlockNum = newblocknum;
746 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
747 laarr[curr].extLocation.partitionReferenceNum =
748 UDF_I(inode)->i_location.partitionReferenceNum;
749 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
750 blocksize;
751 curr++;
752
753 if (blen != offset + 1) {
754 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
755 laarr[curr].extLocation.logicalBlockNum +=
756 offset + 1;
757 laarr[curr].extLength = (etype << 30) |
758 ((blen - (offset + 1)) << blocksize_bits);
759 curr++;
760 (*endnum)++;
761 }
762 }
763 }
764
765 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
766 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
767 int *endnum)
768 {
769 int start, length = 0, currlength = 0, i;
770
771 if (*endnum >= (c + 1)) {
772 if (!lastblock)
773 return;
774 else
775 start = c;
776 } else {
777 if ((laarr[c + 1].extLength >> 30) ==
778 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
779 start = c + 1;
780 length = currlength =
781 (((laarr[c + 1].extLength &
782 UDF_EXTENT_LENGTH_MASK) +
783 inode->i_sb->s_blocksize - 1) >>
784 inode->i_sb->s_blocksize_bits);
785 } else
786 start = c;
787 }
788
789 for (i = start + 1; i <= *endnum; i++) {
790 if (i == *endnum) {
791 if (lastblock)
792 length += UDF_DEFAULT_PREALLOC_BLOCKS;
793 } else if ((laarr[i].extLength >> 30) ==
794 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
795 length += (((laarr[i].extLength &
796 UDF_EXTENT_LENGTH_MASK) +
797 inode->i_sb->s_blocksize - 1) >>
798 inode->i_sb->s_blocksize_bits);
799 } else
800 break;
801 }
802
803 if (length) {
804 int next = laarr[start].extLocation.logicalBlockNum +
805 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
806 inode->i_sb->s_blocksize - 1) >>
807 inode->i_sb->s_blocksize_bits);
808 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
809 laarr[start].extLocation.partitionReferenceNum,
810 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
811 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
812 currlength);
813 if (numalloc) {
814 if (start == (c + 1))
815 laarr[start].extLength +=
816 (numalloc <<
817 inode->i_sb->s_blocksize_bits);
818 else {
819 memmove(&laarr[c + 2], &laarr[c + 1],
820 sizeof(long_ad) * (*endnum - (c + 1)));
821 (*endnum)++;
822 laarr[c + 1].extLocation.logicalBlockNum = next;
823 laarr[c + 1].extLocation.partitionReferenceNum =
824 laarr[c].extLocation.
825 partitionReferenceNum;
826 laarr[c + 1].extLength =
827 EXT_NOT_RECORDED_ALLOCATED |
828 (numalloc <<
829 inode->i_sb->s_blocksize_bits);
830 start = c + 1;
831 }
832
833 for (i = start + 1; numalloc && i < *endnum; i++) {
834 int elen = ((laarr[i].extLength &
835 UDF_EXTENT_LENGTH_MASK) +
836 inode->i_sb->s_blocksize - 1) >>
837 inode->i_sb->s_blocksize_bits;
838
839 if (elen > numalloc) {
840 laarr[i].extLength -=
841 (numalloc <<
842 inode->i_sb->s_blocksize_bits);
843 numalloc = 0;
844 } else {
845 numalloc -= elen;
846 if (*endnum > (i + 1))
847 memmove(&laarr[i],
848 &laarr[i + 1],
849 sizeof(long_ad) *
850 (*endnum - (i + 1)));
851 i--;
852 (*endnum)--;
853 }
854 }
855 UDF_I(inode)->i_lenExtents +=
856 numalloc << inode->i_sb->s_blocksize_bits;
857 }
858 }
859 }
860
861 static void udf_merge_extents(struct inode *inode,
862 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
863 int *endnum)
864 {
865 int i;
866 unsigned long blocksize = inode->i_sb->s_blocksize;
867 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
868
869 for (i = 0; i < (*endnum - 1); i++) {
870 kernel_long_ad *li /*l[i]*/ = &laarr[i];
871 kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
872
873 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
874 (((li->extLength >> 30) ==
875 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
876 ((lip1->extLocation.logicalBlockNum -
877 li->extLocation.logicalBlockNum) ==
878 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
879 blocksize - 1) >> blocksize_bits)))) {
880
881 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
882 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
883 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
884 lip1->extLength = (lip1->extLength -
885 (li->extLength &
886 UDF_EXTENT_LENGTH_MASK) +
887 UDF_EXTENT_LENGTH_MASK) &
888 ~(blocksize - 1);
889 li->extLength = (li->extLength &
890 UDF_EXTENT_FLAG_MASK) +
891 (UDF_EXTENT_LENGTH_MASK + 1) -
892 blocksize;
893 lip1->extLocation.logicalBlockNum =
894 li->extLocation.logicalBlockNum +
895 ((li->extLength &
896 UDF_EXTENT_LENGTH_MASK) >>
897 blocksize_bits);
898 } else {
899 li->extLength = lip1->extLength +
900 (((li->extLength &
901 UDF_EXTENT_LENGTH_MASK) +
902 blocksize - 1) & ~(blocksize - 1));
903 if (*endnum > (i + 2))
904 memmove(&laarr[i + 1], &laarr[i + 2],
905 sizeof(long_ad) *
906 (*endnum - (i + 2)));
907 i--;
908 (*endnum)--;
909 }
910 } else if (((li->extLength >> 30) ==
911 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
912 ((lip1->extLength >> 30) ==
913 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
914 udf_free_blocks(inode->i_sb, inode, li->extLocation, 0,
915 ((li->extLength &
916 UDF_EXTENT_LENGTH_MASK) +
917 blocksize - 1) >> blocksize_bits);
918 li->extLocation.logicalBlockNum = 0;
919 li->extLocation.partitionReferenceNum = 0;
920
921 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
922 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
923 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
924 lip1->extLength = (lip1->extLength -
925 (li->extLength &
926 UDF_EXTENT_LENGTH_MASK) +
927 UDF_EXTENT_LENGTH_MASK) &
928 ~(blocksize - 1);
929 li->extLength = (li->extLength &
930 UDF_EXTENT_FLAG_MASK) +
931 (UDF_EXTENT_LENGTH_MASK + 1) -
932 blocksize;
933 } else {
934 li->extLength = lip1->extLength +
935 (((li->extLength &
936 UDF_EXTENT_LENGTH_MASK) +
937 blocksize - 1) & ~(blocksize - 1));
938 if (*endnum > (i + 2))
939 memmove(&laarr[i + 1], &laarr[i + 2],
940 sizeof(long_ad) *
941 (*endnum - (i + 2)));
942 i--;
943 (*endnum)--;
944 }
945 } else if ((li->extLength >> 30) ==
946 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
947 udf_free_blocks(inode->i_sb, inode,
948 li->extLocation, 0,
949 ((li->extLength &
950 UDF_EXTENT_LENGTH_MASK) +
951 blocksize - 1) >> blocksize_bits);
952 li->extLocation.logicalBlockNum = 0;
953 li->extLocation.partitionReferenceNum = 0;
954 li->extLength = (li->extLength &
955 UDF_EXTENT_LENGTH_MASK) |
956 EXT_NOT_RECORDED_NOT_ALLOCATED;
957 }
958 }
959 }
960
961 static void udf_update_extents(struct inode *inode,
962 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
963 int startnum, int endnum,
964 struct extent_position *epos)
965 {
966 int start = 0, i;
967 kernel_lb_addr tmploc;
968 uint32_t tmplen;
969
970 if (startnum > endnum) {
971 for (i = 0; i < (startnum - endnum); i++)
972 udf_delete_aext(inode, *epos, laarr[i].extLocation,
973 laarr[i].extLength);
974 } else if (startnum < endnum) {
975 for (i = 0; i < (endnum - startnum); i++) {
976 udf_insert_aext(inode, *epos, laarr[i].extLocation,
977 laarr[i].extLength);
978 udf_next_aext(inode, epos, &laarr[i].extLocation,
979 &laarr[i].extLength, 1);
980 start++;
981 }
982 }
983
984 for (i = start; i < endnum; i++) {
985 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
986 udf_write_aext(inode, epos, laarr[i].extLocation,
987 laarr[i].extLength, 1);
988 }
989 }
990
991 struct buffer_head *udf_bread(struct inode *inode, int block,
992 int create, int *err)
993 {
994 struct buffer_head *bh = NULL;
995
996 bh = udf_getblk(inode, block, create, err);
997 if (!bh)
998 return NULL;
999
1000 if (buffer_uptodate(bh))
1001 return bh;
1002
1003 ll_rw_block(READ, 1, &bh);
1004
1005 wait_on_buffer(bh);
1006 if (buffer_uptodate(bh))
1007 return bh;
1008
1009 brelse(bh);
1010 *err = -EIO;
1011 return NULL;
1012 }
1013
1014 void udf_truncate(struct inode *inode)
1015 {
1016 int offset;
1017 int err;
1018 struct udf_inode_info *iinfo;
1019
1020 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1021 S_ISLNK(inode->i_mode)))
1022 return;
1023 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1024 return;
1025
1026 lock_kernel();
1027 iinfo = UDF_I(inode);
1028 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1029 if (inode->i_sb->s_blocksize <
1030 (udf_file_entry_alloc_offset(inode) +
1031 inode->i_size)) {
1032 udf_expand_file_adinicb(inode, inode->i_size, &err);
1033 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1034 inode->i_size = iinfo->i_lenAlloc;
1035 unlock_kernel();
1036 return;
1037 } else
1038 udf_truncate_extents(inode);
1039 } else {
1040 offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1041 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1042 0x00, inode->i_sb->s_blocksize -
1043 offset - udf_file_entry_alloc_offset(inode));
1044 iinfo->i_lenAlloc = inode->i_size;
1045 }
1046 } else {
1047 block_truncate_page(inode->i_mapping, inode->i_size,
1048 udf_get_block);
1049 udf_truncate_extents(inode);
1050 }
1051
1052 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1053 if (IS_SYNC(inode))
1054 udf_sync_inode(inode);
1055 else
1056 mark_inode_dirty(inode);
1057 unlock_kernel();
1058 }
1059
1060 static void __udf_read_inode(struct inode *inode)
1061 {
1062 struct buffer_head *bh = NULL;
1063 struct fileEntry *fe;
1064 uint16_t ident;
1065 struct udf_inode_info *iinfo = UDF_I(inode);
1066
1067 /*
1068 * Set defaults, but the inode is still incomplete!
1069 * Note: get_new_inode() sets the following on a new inode:
1070 * i_sb = sb
1071 * i_no = ino
1072 * i_flags = sb->s_flags
1073 * i_state = 0
1074 * clean_inode(): zero fills and sets
1075 * i_count = 1
1076 * i_nlink = 1
1077 * i_op = NULL;
1078 */
1079 bh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 0, &ident);
1080 if (!bh) {
1081 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1082 inode->i_ino);
1083 make_bad_inode(inode);
1084 return;
1085 }
1086
1087 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1088 ident != TAG_IDENT_USE) {
1089 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1090 "failed ident=%d\n", inode->i_ino, ident);
1091 brelse(bh);
1092 make_bad_inode(inode);
1093 return;
1094 }
1095
1096 fe = (struct fileEntry *)bh->b_data;
1097
1098 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1099 struct buffer_head *ibh;
1100
1101 ibh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 1,
1102 &ident);
1103 if (ident == TAG_IDENT_IE && ibh) {
1104 struct buffer_head *nbh = NULL;
1105 kernel_lb_addr loc;
1106 struct indirectEntry *ie;
1107
1108 ie = (struct indirectEntry *)ibh->b_data;
1109 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1110
1111 if (ie->indirectICB.extLength &&
1112 (nbh = udf_read_ptagged(inode->i_sb, loc, 0,
1113 &ident))) {
1114 if (ident == TAG_IDENT_FE ||
1115 ident == TAG_IDENT_EFE) {
1116 memcpy(&iinfo->i_location,
1117 &loc,
1118 sizeof(kernel_lb_addr));
1119 brelse(bh);
1120 brelse(ibh);
1121 brelse(nbh);
1122 __udf_read_inode(inode);
1123 return;
1124 }
1125 brelse(nbh);
1126 }
1127 }
1128 brelse(ibh);
1129 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1130 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1131 le16_to_cpu(fe->icbTag.strategyType));
1132 brelse(bh);
1133 make_bad_inode(inode);
1134 return;
1135 }
1136 udf_fill_inode(inode, bh);
1137
1138 brelse(bh);
1139 }
1140
1141 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1142 {
1143 struct fileEntry *fe;
1144 struct extendedFileEntry *efe;
1145 int offset;
1146 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1147 struct udf_inode_info *iinfo = UDF_I(inode);
1148
1149 fe = (struct fileEntry *)bh->b_data;
1150 efe = (struct extendedFileEntry *)bh->b_data;
1151
1152 if (fe->icbTag.strategyType == cpu_to_le16(4))
1153 iinfo->i_strat4096 = 0;
1154 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1155 iinfo->i_strat4096 = 1;
1156
1157 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1158 ICBTAG_FLAG_AD_MASK;
1159 iinfo->i_unique = 0;
1160 iinfo->i_lenEAttr = 0;
1161 iinfo->i_lenExtents = 0;
1162 iinfo->i_lenAlloc = 0;
1163 iinfo->i_next_alloc_block = 0;
1164 iinfo->i_next_alloc_goal = 0;
1165 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1166 iinfo->i_efe = 1;
1167 iinfo->i_use = 0;
1168 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1169 sizeof(struct extendedFileEntry))) {
1170 make_bad_inode(inode);
1171 return;
1172 }
1173 memcpy(iinfo->i_ext.i_data,
1174 bh->b_data + sizeof(struct extendedFileEntry),
1175 inode->i_sb->s_blocksize -
1176 sizeof(struct extendedFileEntry));
1177 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1178 iinfo->i_efe = 0;
1179 iinfo->i_use = 0;
1180 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1181 sizeof(struct fileEntry))) {
1182 make_bad_inode(inode);
1183 return;
1184 }
1185 memcpy(iinfo->i_ext.i_data,
1186 bh->b_data + sizeof(struct fileEntry),
1187 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1188 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1189 iinfo->i_efe = 0;
1190 iinfo->i_use = 1;
1191 iinfo->i_lenAlloc = le32_to_cpu(
1192 ((struct unallocSpaceEntry *)bh->b_data)->
1193 lengthAllocDescs);
1194 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1195 sizeof(struct unallocSpaceEntry))) {
1196 make_bad_inode(inode);
1197 return;
1198 }
1199 memcpy(iinfo->i_ext.i_data,
1200 bh->b_data + sizeof(struct unallocSpaceEntry),
1201 inode->i_sb->s_blocksize -
1202 sizeof(struct unallocSpaceEntry));
1203 return;
1204 }
1205
1206 inode->i_uid = le32_to_cpu(fe->uid);
1207 if (inode->i_uid == -1 ||
1208 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1209 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1210 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1211
1212 inode->i_gid = le32_to_cpu(fe->gid);
1213 if (inode->i_gid == -1 ||
1214 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1215 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1216 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1217
1218 inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1219 if (!inode->i_nlink)
1220 inode->i_nlink = 1;
1221
1222 inode->i_size = le64_to_cpu(fe->informationLength);
1223 iinfo->i_lenExtents = inode->i_size;
1224
1225 inode->i_mode = udf_convert_permissions(fe);
1226 inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1227
1228 if (iinfo->i_efe == 0) {
1229 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1230 (inode->i_sb->s_blocksize_bits - 9);
1231
1232 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1233 inode->i_atime = sbi->s_record_time;
1234
1235 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1236 fe->modificationTime))
1237 inode->i_mtime = sbi->s_record_time;
1238
1239 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1240 inode->i_ctime = sbi->s_record_time;
1241
1242 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1243 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1244 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1245 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1246 } else {
1247 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1248 (inode->i_sb->s_blocksize_bits - 9);
1249
1250 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1251 inode->i_atime = sbi->s_record_time;
1252
1253 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1254 efe->modificationTime))
1255 inode->i_mtime = sbi->s_record_time;
1256
1257 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1258 iinfo->i_crtime = sbi->s_record_time;
1259
1260 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1261 inode->i_ctime = sbi->s_record_time;
1262
1263 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1264 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1265 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1266 offset = sizeof(struct extendedFileEntry) +
1267 iinfo->i_lenEAttr;
1268 }
1269
1270 switch (fe->icbTag.fileType) {
1271 case ICBTAG_FILE_TYPE_DIRECTORY:
1272 inode->i_op = &udf_dir_inode_operations;
1273 inode->i_fop = &udf_dir_operations;
1274 inode->i_mode |= S_IFDIR;
1275 inc_nlink(inode);
1276 break;
1277 case ICBTAG_FILE_TYPE_REALTIME:
1278 case ICBTAG_FILE_TYPE_REGULAR:
1279 case ICBTAG_FILE_TYPE_UNDEF:
1280 case ICBTAG_FILE_TYPE_VAT20:
1281 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1282 inode->i_data.a_ops = &udf_adinicb_aops;
1283 else
1284 inode->i_data.a_ops = &udf_aops;
1285 inode->i_op = &udf_file_inode_operations;
1286 inode->i_fop = &udf_file_operations;
1287 inode->i_mode |= S_IFREG;
1288 break;
1289 case ICBTAG_FILE_TYPE_BLOCK:
1290 inode->i_mode |= S_IFBLK;
1291 break;
1292 case ICBTAG_FILE_TYPE_CHAR:
1293 inode->i_mode |= S_IFCHR;
1294 break;
1295 case ICBTAG_FILE_TYPE_FIFO:
1296 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1297 break;
1298 case ICBTAG_FILE_TYPE_SOCKET:
1299 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1300 break;
1301 case ICBTAG_FILE_TYPE_SYMLINK:
1302 inode->i_data.a_ops = &udf_symlink_aops;
1303 inode->i_op = &page_symlink_inode_operations;
1304 inode->i_mode = S_IFLNK | S_IRWXUGO;
1305 break;
1306 case ICBTAG_FILE_TYPE_MAIN:
1307 udf_debug("METADATA FILE-----\n");
1308 break;
1309 case ICBTAG_FILE_TYPE_MIRROR:
1310 udf_debug("METADATA MIRROR FILE-----\n");
1311 break;
1312 case ICBTAG_FILE_TYPE_BITMAP:
1313 udf_debug("METADATA BITMAP FILE-----\n");
1314 break;
1315 default:
1316 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1317 "file type=%d\n", inode->i_ino,
1318 fe->icbTag.fileType);
1319 make_bad_inode(inode);
1320 return;
1321 }
1322 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1323 struct deviceSpec *dsea =
1324 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1325 if (dsea) {
1326 init_special_inode(inode, inode->i_mode,
1327 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1328 le32_to_cpu(dsea->minorDeviceIdent)));
1329 /* Developer ID ??? */
1330 } else
1331 make_bad_inode(inode);
1332 }
1333 }
1334
1335 static int udf_alloc_i_data(struct inode *inode, size_t size)
1336 {
1337 struct udf_inode_info *iinfo = UDF_I(inode);
1338 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1339
1340 if (!iinfo->i_ext.i_data) {
1341 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1342 "no free memory\n", inode->i_ino);
1343 return -ENOMEM;
1344 }
1345
1346 return 0;
1347 }
1348
1349 static mode_t udf_convert_permissions(struct fileEntry *fe)
1350 {
1351 mode_t mode;
1352 uint32_t permissions;
1353 uint32_t flags;
1354
1355 permissions = le32_to_cpu(fe->permissions);
1356 flags = le16_to_cpu(fe->icbTag.flags);
1357
1358 mode = ((permissions) & S_IRWXO) |
1359 ((permissions >> 2) & S_IRWXG) |
1360 ((permissions >> 4) & S_IRWXU) |
1361 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1362 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1363 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1364
1365 return mode;
1366 }
1367
1368 int udf_write_inode(struct inode *inode, int sync)
1369 {
1370 int ret;
1371
1372 lock_kernel();
1373 ret = udf_update_inode(inode, sync);
1374 unlock_kernel();
1375
1376 return ret;
1377 }
1378
1379 int udf_sync_inode(struct inode *inode)
1380 {
1381 return udf_update_inode(inode, 1);
1382 }
1383
1384 static int udf_update_inode(struct inode *inode, int do_sync)
1385 {
1386 struct buffer_head *bh = NULL;
1387 struct fileEntry *fe;
1388 struct extendedFileEntry *efe;
1389 uint32_t udfperms;
1390 uint16_t icbflags;
1391 uint16_t crclen;
1392 int err = 0;
1393 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1394 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1395 struct udf_inode_info *iinfo = UDF_I(inode);
1396
1397 bh = udf_tread(inode->i_sb,
1398 udf_get_lb_pblock(inode->i_sb,
1399 iinfo->i_location, 0));
1400 if (!bh) {
1401 udf_debug("bread failure\n");
1402 return -EIO;
1403 }
1404
1405 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1406
1407 fe = (struct fileEntry *)bh->b_data;
1408 efe = (struct extendedFileEntry *)bh->b_data;
1409
1410 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1411 struct unallocSpaceEntry *use =
1412 (struct unallocSpaceEntry *)bh->b_data;
1413
1414 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1415 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1416 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1417 sizeof(struct unallocSpaceEntry));
1418 crclen = sizeof(struct unallocSpaceEntry) +
1419 iinfo->i_lenAlloc - sizeof(tag);
1420 use->descTag.tagLocation = cpu_to_le32(
1421 iinfo->i_location.
1422 logicalBlockNum);
1423 use->descTag.descCRCLength = cpu_to_le16(crclen);
1424 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1425 sizeof(tag),
1426 crclen));
1427 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1428
1429 mark_buffer_dirty(bh);
1430 brelse(bh);
1431 return err;
1432 }
1433
1434 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1435 fe->uid = cpu_to_le32(-1);
1436 else
1437 fe->uid = cpu_to_le32(inode->i_uid);
1438
1439 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1440 fe->gid = cpu_to_le32(-1);
1441 else
1442 fe->gid = cpu_to_le32(inode->i_gid);
1443
1444 udfperms = ((inode->i_mode & S_IRWXO)) |
1445 ((inode->i_mode & S_IRWXG) << 2) |
1446 ((inode->i_mode & S_IRWXU) << 4);
1447
1448 udfperms |= (le32_to_cpu(fe->permissions) &
1449 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1450 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1451 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1452 fe->permissions = cpu_to_le32(udfperms);
1453
1454 if (S_ISDIR(inode->i_mode))
1455 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1456 else
1457 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1458
1459 fe->informationLength = cpu_to_le64(inode->i_size);
1460
1461 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1462 regid *eid;
1463 struct deviceSpec *dsea =
1464 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1465 if (!dsea) {
1466 dsea = (struct deviceSpec *)
1467 udf_add_extendedattr(inode,
1468 sizeof(struct deviceSpec) +
1469 sizeof(regid), 12, 0x3);
1470 dsea->attrType = cpu_to_le32(12);
1471 dsea->attrSubtype = 1;
1472 dsea->attrLength = cpu_to_le32(
1473 sizeof(struct deviceSpec) +
1474 sizeof(regid));
1475 dsea->impUseLength = cpu_to_le32(sizeof(regid));
1476 }
1477 eid = (regid *)dsea->impUse;
1478 memset(eid, 0, sizeof(regid));
1479 strcpy(eid->ident, UDF_ID_DEVELOPER);
1480 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1481 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1482 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1483 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1484 }
1485
1486 if (iinfo->i_efe == 0) {
1487 memcpy(bh->b_data + sizeof(struct fileEntry),
1488 iinfo->i_ext.i_data,
1489 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1490 fe->logicalBlocksRecorded = cpu_to_le64(
1491 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1492 (blocksize_bits - 9));
1493
1494 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1495 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1496 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1497 memset(&(fe->impIdent), 0, sizeof(regid));
1498 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1499 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1500 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1501 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1502 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1503 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1504 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1505 crclen = sizeof(struct fileEntry);
1506 } else {
1507 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1508 iinfo->i_ext.i_data,
1509 inode->i_sb->s_blocksize -
1510 sizeof(struct extendedFileEntry));
1511 efe->objectSize = cpu_to_le64(inode->i_size);
1512 efe->logicalBlocksRecorded = cpu_to_le64(
1513 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1514 (blocksize_bits - 9));
1515
1516 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1517 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1518 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1519 iinfo->i_crtime = inode->i_atime;
1520
1521 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1522 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1523 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1524 iinfo->i_crtime = inode->i_mtime;
1525
1526 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1527 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1528 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1529 iinfo->i_crtime = inode->i_ctime;
1530
1531 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1532 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1533 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1534 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1535
1536 memset(&(efe->impIdent), 0, sizeof(regid));
1537 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1538 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1539 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1540 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1541 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1542 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1543 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1544 crclen = sizeof(struct extendedFileEntry);
1545 }
1546 if (iinfo->i_strat4096) {
1547 fe->icbTag.strategyType = cpu_to_le16(4096);
1548 fe->icbTag.strategyParameter = cpu_to_le16(1);
1549 fe->icbTag.numEntries = cpu_to_le16(2);
1550 } else {
1551 fe->icbTag.strategyType = cpu_to_le16(4);
1552 fe->icbTag.numEntries = cpu_to_le16(1);
1553 }
1554
1555 if (S_ISDIR(inode->i_mode))
1556 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1557 else if (S_ISREG(inode->i_mode))
1558 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1559 else if (S_ISLNK(inode->i_mode))
1560 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1561 else if (S_ISBLK(inode->i_mode))
1562 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1563 else if (S_ISCHR(inode->i_mode))
1564 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1565 else if (S_ISFIFO(inode->i_mode))
1566 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1567 else if (S_ISSOCK(inode->i_mode))
1568 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1569
1570 icbflags = iinfo->i_alloc_type |
1571 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1572 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1573 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1574 (le16_to_cpu(fe->icbTag.flags) &
1575 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1576 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1577
1578 fe->icbTag.flags = cpu_to_le16(icbflags);
1579 if (sbi->s_udfrev >= 0x0200)
1580 fe->descTag.descVersion = cpu_to_le16(3);
1581 else
1582 fe->descTag.descVersion = cpu_to_le16(2);
1583 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1584 fe->descTag.tagLocation = cpu_to_le32(
1585 iinfo->i_location.logicalBlockNum);
1586 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1587 sizeof(tag);
1588 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1589 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(tag),
1590 crclen));
1591 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1592
1593 /* write the data blocks */
1594 mark_buffer_dirty(bh);
1595 if (do_sync) {
1596 sync_dirty_buffer(bh);
1597 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1598 printk(KERN_WARNING "IO error syncing udf inode "
1599 "[%s:%08lx]\n", inode->i_sb->s_id,
1600 inode->i_ino);
1601 err = -EIO;
1602 }
1603 }
1604 brelse(bh);
1605
1606 return err;
1607 }
1608
1609 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1610 {
1611 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1612 struct inode *inode = iget_locked(sb, block);
1613
1614 if (!inode)
1615 return NULL;
1616
1617 if (inode->i_state & I_NEW) {
1618 memcpy(&UDF_I(inode)->i_location, &ino, sizeof(kernel_lb_addr));
1619 __udf_read_inode(inode);
1620 unlock_new_inode(inode);
1621 }
1622
1623 if (is_bad_inode(inode))
1624 goto out_iput;
1625
1626 if (ino.logicalBlockNum >= UDF_SB(sb)->
1627 s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1628 udf_debug("block=%d, partition=%d out of range\n",
1629 ino.logicalBlockNum, ino.partitionReferenceNum);
1630 make_bad_inode(inode);
1631 goto out_iput;
1632 }
1633
1634 return inode;
1635
1636 out_iput:
1637 iput(inode);
1638 return NULL;
1639 }
1640
1641 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1642 kernel_lb_addr eloc, uint32_t elen, int inc)
1643 {
1644 int adsize;
1645 short_ad *sad = NULL;
1646 long_ad *lad = NULL;
1647 struct allocExtDesc *aed;
1648 int8_t etype;
1649 uint8_t *ptr;
1650 struct udf_inode_info *iinfo = UDF_I(inode);
1651
1652 if (!epos->bh)
1653 ptr = iinfo->i_ext.i_data + epos->offset -
1654 udf_file_entry_alloc_offset(inode) +
1655 iinfo->i_lenEAttr;
1656 else
1657 ptr = epos->bh->b_data + epos->offset;
1658
1659 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1660 adsize = sizeof(short_ad);
1661 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1662 adsize = sizeof(long_ad);
1663 else
1664 return -1;
1665
1666 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1667 char *sptr, *dptr;
1668 struct buffer_head *nbh;
1669 int err, loffset;
1670 kernel_lb_addr obloc = epos->block;
1671
1672 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1673 obloc.partitionReferenceNum,
1674 obloc.logicalBlockNum, &err);
1675 if (!epos->block.logicalBlockNum)
1676 return -1;
1677 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1678 epos->block,
1679 0));
1680 if (!nbh)
1681 return -1;
1682 lock_buffer(nbh);
1683 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1684 set_buffer_uptodate(nbh);
1685 unlock_buffer(nbh);
1686 mark_buffer_dirty_inode(nbh, inode);
1687
1688 aed = (struct allocExtDesc *)(nbh->b_data);
1689 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1690 aed->previousAllocExtLocation =
1691 cpu_to_le32(obloc.logicalBlockNum);
1692 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1693 loffset = epos->offset;
1694 aed->lengthAllocDescs = cpu_to_le32(adsize);
1695 sptr = ptr - adsize;
1696 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1697 memcpy(dptr, sptr, adsize);
1698 epos->offset = sizeof(struct allocExtDesc) + adsize;
1699 } else {
1700 loffset = epos->offset + adsize;
1701 aed->lengthAllocDescs = cpu_to_le32(0);
1702 sptr = ptr;
1703 epos->offset = sizeof(struct allocExtDesc);
1704
1705 if (epos->bh) {
1706 aed = (struct allocExtDesc *)epos->bh->b_data;
1707 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1708 } else {
1709 iinfo->i_lenAlloc += adsize;
1710 mark_inode_dirty(inode);
1711 }
1712 }
1713 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1714 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1715 epos->block.logicalBlockNum, sizeof(tag));
1716 else
1717 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1718 epos->block.logicalBlockNum, sizeof(tag));
1719 switch (iinfo->i_alloc_type) {
1720 case ICBTAG_FLAG_AD_SHORT:
1721 sad = (short_ad *)sptr;
1722 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1723 inode->i_sb->s_blocksize);
1724 sad->extPosition =
1725 cpu_to_le32(epos->block.logicalBlockNum);
1726 break;
1727 case ICBTAG_FLAG_AD_LONG:
1728 lad = (long_ad *)sptr;
1729 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1730 inode->i_sb->s_blocksize);
1731 lad->extLocation = cpu_to_lelb(epos->block);
1732 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1733 break;
1734 }
1735 if (epos->bh) {
1736 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1737 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1738 udf_update_tag(epos->bh->b_data, loffset);
1739 else
1740 udf_update_tag(epos->bh->b_data,
1741 sizeof(struct allocExtDesc));
1742 mark_buffer_dirty_inode(epos->bh, inode);
1743 brelse(epos->bh);
1744 } else {
1745 mark_inode_dirty(inode);
1746 }
1747 epos->bh = nbh;
1748 }
1749
1750 etype = udf_write_aext(inode, epos, eloc, elen, inc);
1751
1752 if (!epos->bh) {
1753 iinfo->i_lenAlloc += adsize;
1754 mark_inode_dirty(inode);
1755 } else {
1756 aed = (struct allocExtDesc *)epos->bh->b_data;
1757 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1758 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1759 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1760 udf_update_tag(epos->bh->b_data,
1761 epos->offset + (inc ? 0 : adsize));
1762 else
1763 udf_update_tag(epos->bh->b_data,
1764 sizeof(struct allocExtDesc));
1765 mark_buffer_dirty_inode(epos->bh, inode);
1766 }
1767
1768 return etype;
1769 }
1770
1771 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1772 kernel_lb_addr eloc, uint32_t elen, int inc)
1773 {
1774 int adsize;
1775 uint8_t *ptr;
1776 short_ad *sad;
1777 long_ad *lad;
1778 struct udf_inode_info *iinfo = UDF_I(inode);
1779
1780 if (!epos->bh)
1781 ptr = iinfo->i_ext.i_data + epos->offset -
1782 udf_file_entry_alloc_offset(inode) +
1783 iinfo->i_lenEAttr;
1784 else
1785 ptr = epos->bh->b_data + epos->offset;
1786
1787 switch (iinfo->i_alloc_type) {
1788 case ICBTAG_FLAG_AD_SHORT:
1789 sad = (short_ad *)ptr;
1790 sad->extLength = cpu_to_le32(elen);
1791 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1792 adsize = sizeof(short_ad);
1793 break;
1794 case ICBTAG_FLAG_AD_LONG:
1795 lad = (long_ad *)ptr;
1796 lad->extLength = cpu_to_le32(elen);
1797 lad->extLocation = cpu_to_lelb(eloc);
1798 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1799 adsize = sizeof(long_ad);
1800 break;
1801 default:
1802 return -1;
1803 }
1804
1805 if (epos->bh) {
1806 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1807 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1808 struct allocExtDesc *aed =
1809 (struct allocExtDesc *)epos->bh->b_data;
1810 udf_update_tag(epos->bh->b_data,
1811 le32_to_cpu(aed->lengthAllocDescs) +
1812 sizeof(struct allocExtDesc));
1813 }
1814 mark_buffer_dirty_inode(epos->bh, inode);
1815 } else {
1816 mark_inode_dirty(inode);
1817 }
1818
1819 if (inc)
1820 epos->offset += adsize;
1821
1822 return (elen >> 30);
1823 }
1824
1825 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1826 kernel_lb_addr *eloc, uint32_t *elen, int inc)
1827 {
1828 int8_t etype;
1829
1830 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1831 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1832 int block;
1833 epos->block = *eloc;
1834 epos->offset = sizeof(struct allocExtDesc);
1835 brelse(epos->bh);
1836 block = udf_get_lb_pblock(inode->i_sb, epos->block, 0);
1837 epos->bh = udf_tread(inode->i_sb, block);
1838 if (!epos->bh) {
1839 udf_debug("reading block %d failed!\n", block);
1840 return -1;
1841 }
1842 }
1843
1844 return etype;
1845 }
1846
1847 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1848 kernel_lb_addr *eloc, uint32_t *elen, int inc)
1849 {
1850 int alen;
1851 int8_t etype;
1852 uint8_t *ptr;
1853 short_ad *sad;
1854 long_ad *lad;
1855 struct udf_inode_info *iinfo = UDF_I(inode);
1856
1857 if (!epos->bh) {
1858 if (!epos->offset)
1859 epos->offset = udf_file_entry_alloc_offset(inode);
1860 ptr = iinfo->i_ext.i_data + epos->offset -
1861 udf_file_entry_alloc_offset(inode) +
1862 iinfo->i_lenEAttr;
1863 alen = udf_file_entry_alloc_offset(inode) +
1864 iinfo->i_lenAlloc;
1865 } else {
1866 if (!epos->offset)
1867 epos->offset = sizeof(struct allocExtDesc);
1868 ptr = epos->bh->b_data + epos->offset;
1869 alen = sizeof(struct allocExtDesc) +
1870 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1871 lengthAllocDescs);
1872 }
1873
1874 switch (iinfo->i_alloc_type) {
1875 case ICBTAG_FLAG_AD_SHORT:
1876 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1877 if (!sad)
1878 return -1;
1879 etype = le32_to_cpu(sad->extLength) >> 30;
1880 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1881 eloc->partitionReferenceNum =
1882 iinfo->i_location.partitionReferenceNum;
1883 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1884 break;
1885 case ICBTAG_FLAG_AD_LONG:
1886 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1887 if (!lad)
1888 return -1;
1889 etype = le32_to_cpu(lad->extLength) >> 30;
1890 *eloc = lelb_to_cpu(lad->extLocation);
1891 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1892 break;
1893 default:
1894 udf_debug("alloc_type = %d unsupported\n",
1895 iinfo->i_alloc_type);
1896 return -1;
1897 }
1898
1899 return etype;
1900 }
1901
1902 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1903 kernel_lb_addr neloc, uint32_t nelen)
1904 {
1905 kernel_lb_addr oeloc;
1906 uint32_t oelen;
1907 int8_t etype;
1908
1909 if (epos.bh)
1910 get_bh(epos.bh);
1911
1912 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1913 udf_write_aext(inode, &epos, neloc, nelen, 1);
1914 neloc = oeloc;
1915 nelen = (etype << 30) | oelen;
1916 }
1917 udf_add_aext(inode, &epos, neloc, nelen, 1);
1918 brelse(epos.bh);
1919
1920 return (nelen >> 30);
1921 }
1922
1923 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1924 kernel_lb_addr eloc, uint32_t elen)
1925 {
1926 struct extent_position oepos;
1927 int adsize;
1928 int8_t etype;
1929 struct allocExtDesc *aed;
1930 struct udf_inode_info *iinfo;
1931
1932 if (epos.bh) {
1933 get_bh(epos.bh);
1934 get_bh(epos.bh);
1935 }
1936
1937 iinfo = UDF_I(inode);
1938 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1939 adsize = sizeof(short_ad);
1940 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1941 adsize = sizeof(long_ad);
1942 else
1943 adsize = 0;
1944
1945 oepos = epos;
1946 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1947 return -1;
1948
1949 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1950 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1951 if (oepos.bh != epos.bh) {
1952 oepos.block = epos.block;
1953 brelse(oepos.bh);
1954 get_bh(epos.bh);
1955 oepos.bh = epos.bh;
1956 oepos.offset = epos.offset - adsize;
1957 }
1958 }
1959 memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1960 elen = 0;
1961
1962 if (epos.bh != oepos.bh) {
1963 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
1964 udf_write_aext(inode, &oepos, eloc, elen, 1);
1965 udf_write_aext(inode, &oepos, eloc, elen, 1);
1966 if (!oepos.bh) {
1967 iinfo->i_lenAlloc -= (adsize * 2);
1968 mark_inode_dirty(inode);
1969 } else {
1970 aed = (struct allocExtDesc *)oepos.bh->b_data;
1971 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1972 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1973 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1974 udf_update_tag(oepos.bh->b_data,
1975 oepos.offset - (2 * adsize));
1976 else
1977 udf_update_tag(oepos.bh->b_data,
1978 sizeof(struct allocExtDesc));
1979 mark_buffer_dirty_inode(oepos.bh, inode);
1980 }
1981 } else {
1982 udf_write_aext(inode, &oepos, eloc, elen, 1);
1983 if (!oepos.bh) {
1984 iinfo->i_lenAlloc -= adsize;
1985 mark_inode_dirty(inode);
1986 } else {
1987 aed = (struct allocExtDesc *)oepos.bh->b_data;
1988 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1989 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1990 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1991 udf_update_tag(oepos.bh->b_data,
1992 epos.offset - adsize);
1993 else
1994 udf_update_tag(oepos.bh->b_data,
1995 sizeof(struct allocExtDesc));
1996 mark_buffer_dirty_inode(oepos.bh, inode);
1997 }
1998 }
1999
2000 brelse(epos.bh);
2001 brelse(oepos.bh);
2002
2003 return (elen >> 30);
2004 }
2005
2006 int8_t inode_bmap(struct inode *inode, sector_t block,
2007 struct extent_position *pos, kernel_lb_addr *eloc,
2008 uint32_t *elen, sector_t *offset)
2009 {
2010 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2011 loff_t lbcount = 0, bcount =
2012 (loff_t) block << blocksize_bits;
2013 int8_t etype;
2014 struct udf_inode_info *iinfo;
2015
2016 iinfo = UDF_I(inode);
2017 pos->offset = 0;
2018 pos->block = iinfo->i_location;
2019 pos->bh = NULL;
2020 *elen = 0;
2021
2022 do {
2023 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2024 if (etype == -1) {
2025 *offset = (bcount - lbcount) >> blocksize_bits;
2026 iinfo->i_lenExtents = lbcount;
2027 return -1;
2028 }
2029 lbcount += *elen;
2030 } while (lbcount <= bcount);
2031
2032 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2033
2034 return etype;
2035 }
2036
2037 long udf_block_map(struct inode *inode, sector_t block)
2038 {
2039 kernel_lb_addr eloc;
2040 uint32_t elen;
2041 sector_t offset;
2042 struct extent_position epos = {};
2043 int ret;
2044
2045 lock_kernel();
2046
2047 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2048 (EXT_RECORDED_ALLOCATED >> 30))
2049 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2050 else
2051 ret = 0;
2052
2053 unlock_kernel();
2054 brelse(epos.bh);
2055
2056 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2057 return udf_fixed_to_variable(ret);
2058 else
2059 return ret;
2060 }
Stable & featurefull patchset based on Linus's git branch