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udf: udf_get_block, inode_bmap - remove unneeded checks
[linux-2.6/btrfs-unstable.git] / fs / udf / inode.c
blobfb92476fcdd9e260670cc2fe546fecc842a7f10c
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
41 #include "udf_i.h"
42 #include "udf_sb.h"
43
44 MODULE_AUTHOR("Ben Fennema");
45 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
46 MODULE_LICENSE("GPL");
47
48 #define EXTENT_MERGE_SIZE 5
49
50 static mode_t udf_convert_permissions(struct fileEntry *);
51 static int udf_update_inode(struct inode *, int);
52 static void udf_fill_inode(struct inode *, struct buffer_head *);
53 static int udf_alloc_i_data(struct inode *inode, size_t size);
54 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
55 sector_t *, int *);
56 static int8_t udf_insert_aext(struct inode *, struct extent_position,
57 kernel_lb_addr, uint32_t);
58 static void udf_split_extents(struct inode *, int *, int, int,
59 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
60 static void udf_prealloc_extents(struct inode *, int, int,
61 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
62 static void udf_merge_extents(struct inode *,
63 kernel_long_ad[EXTENT_MERGE_SIZE], int *);
64 static void udf_update_extents(struct inode *,
65 kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
66 struct extent_position *);
67 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
68
69
70 void udf_delete_inode(struct inode *inode)
71 {
72 truncate_inode_pages(&inode->i_data, 0);
73
74 if (is_bad_inode(inode))
75 goto no_delete;
76
77 inode->i_size = 0;
78 udf_truncate(inode);
79 lock_kernel();
80
81 udf_update_inode(inode, IS_SYNC(inode));
82 udf_free_inode(inode);
83
84 unlock_kernel();
85 return;
86
87 no_delete:
88 clear_inode(inode);
89 }
90
91 /*
92 * If we are going to release inode from memory, we discard preallocation and
93 * truncate last inode extent to proper length. We could use drop_inode() but
94 * it's called under inode_lock and thus we cannot mark inode dirty there. We
95 * use clear_inode() but we have to make sure to write inode as it's not written
96 * automatically.
97 */
98 void udf_clear_inode(struct inode *inode)
99 {
100 struct udf_inode_info *iinfo;
101 if (!(inode->i_sb->s_flags & MS_RDONLY)) {
102 lock_kernel();
103 /* Discard preallocation for directories, symlinks, etc. */
104 udf_discard_prealloc(inode);
105 udf_truncate_tail_extent(inode);
106 unlock_kernel();
107 write_inode_now(inode, 0);
108 }
109 iinfo = UDF_I(inode);
110 kfree(iinfo->i_ext.i_data);
111 iinfo->i_ext.i_data = NULL;
112 }
113
114 static int udf_writepage(struct page *page, struct writeback_control *wbc)
115 {
116 return block_write_full_page(page, udf_get_block, wbc);
117 }
118
119 static int udf_readpage(struct file *file, struct page *page)
120 {
121 return block_read_full_page(page, udf_get_block);
122 }
123
124 static int udf_write_begin(struct file *file, struct address_space *mapping,
125 loff_t pos, unsigned len, unsigned flags,
126 struct page **pagep, void **fsdata)
127 {
128 *pagep = NULL;
129 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
130 udf_get_block);
131 }
132
133 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
134 {
135 return generic_block_bmap(mapping, block, udf_get_block);
136 }
137
138 const struct address_space_operations udf_aops = {
139 .readpage = udf_readpage,
140 .writepage = udf_writepage,
141 .sync_page = block_sync_page,
142 .write_begin = udf_write_begin,
143 .write_end = generic_write_end,
144 .bmap = udf_bmap,
145 };
146
147 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
148 {
149 struct page *page;
150 char *kaddr;
151 struct udf_inode_info *iinfo = UDF_I(inode);
152 struct writeback_control udf_wbc = {
153 .sync_mode = WB_SYNC_NONE,
154 .nr_to_write = 1,
155 };
156
157 /* from now on we have normal address_space methods */
158 inode->i_data.a_ops = &udf_aops;
159
160 if (!iinfo->i_lenAlloc) {
161 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
162 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
163 else
164 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
165 mark_inode_dirty(inode);
166 return;
167 }
168
169 page = grab_cache_page(inode->i_mapping, 0);
170 BUG_ON(!PageLocked(page));
171
172 if (!PageUptodate(page)) {
173 kaddr = kmap(page);
174 memset(kaddr + iinfo->i_lenAlloc, 0x00,
175 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
176 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
177 iinfo->i_lenAlloc);
178 flush_dcache_page(page);
179 SetPageUptodate(page);
180 kunmap(page);
181 }
182 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
183 iinfo->i_lenAlloc);
184 iinfo->i_lenAlloc = 0;
185 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
186 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
187 else
188 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
189
190 inode->i_data.a_ops->writepage(page, &udf_wbc);
191 page_cache_release(page);
192
193 mark_inode_dirty(inode);
194 }
195
196 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
197 int *err)
198 {
199 int newblock;
200 struct buffer_head *dbh = NULL;
201 kernel_lb_addr eloc;
202 uint32_t elen;
203 uint8_t alloctype;
204 struct extent_position epos;
205
206 struct udf_fileident_bh sfibh, dfibh;
207 loff_t f_pos = udf_ext0_offset(inode);
208 int size = udf_ext0_offset(inode) + inode->i_size;
209 struct fileIdentDesc cfi, *sfi, *dfi;
210 struct udf_inode_info *iinfo = UDF_I(inode);
211
212 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
213 alloctype = ICBTAG_FLAG_AD_SHORT;
214 else
215 alloctype = ICBTAG_FLAG_AD_LONG;
216
217 if (!inode->i_size) {
218 iinfo->i_alloc_type = alloctype;
219 mark_inode_dirty(inode);
220 return NULL;
221 }
222
223 /* alloc block, and copy data to it */
224 *block = udf_new_block(inode->i_sb, inode,
225 iinfo->i_location.partitionReferenceNum,
226 iinfo->i_location.logicalBlockNum, err);
227 if (!(*block))
228 return NULL;
229 newblock = udf_get_pblock(inode->i_sb, *block,
230 iinfo->i_location.partitionReferenceNum,
231 0);
232 if (!newblock)
233 return NULL;
234 dbh = udf_tgetblk(inode->i_sb, newblock);
235 if (!dbh)
236 return NULL;
237 lock_buffer(dbh);
238 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
239 set_buffer_uptodate(dbh);
240 unlock_buffer(dbh);
241 mark_buffer_dirty_inode(dbh, inode);
242
243 sfibh.soffset = sfibh.eoffset =
244 f_pos & (inode->i_sb->s_blocksize - 1);
245 sfibh.sbh = sfibh.ebh = NULL;
246 dfibh.soffset = dfibh.eoffset = 0;
247 dfibh.sbh = dfibh.ebh = dbh;
248 while (f_pos < size) {
249 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
250 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
251 NULL, NULL, NULL);
252 if (!sfi) {
253 brelse(dbh);
254 return NULL;
255 }
256 iinfo->i_alloc_type = alloctype;
257 sfi->descTag.tagLocation = cpu_to_le32(*block);
258 dfibh.soffset = dfibh.eoffset;
259 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
260 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
261 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
262 sfi->fileIdent +
263 le16_to_cpu(sfi->lengthOfImpUse))) {
264 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
265 brelse(dbh);
266 return NULL;
267 }
268 }
269 mark_buffer_dirty_inode(dbh, inode);
270
271 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
272 iinfo->i_lenAlloc);
273 iinfo->i_lenAlloc = 0;
274 eloc.logicalBlockNum = *block;
275 eloc.partitionReferenceNum =
276 iinfo->i_location.partitionReferenceNum;
277 elen = inode->i_sb->s_blocksize;
278 iinfo->i_lenExtents = elen;
279 epos.bh = NULL;
280 epos.block = iinfo->i_location;
281 epos.offset = udf_file_entry_alloc_offset(inode);
282 udf_add_aext(inode, &epos, eloc, elen, 0);
283 /* UniqueID stuff */
284
285 brelse(epos.bh);
286 mark_inode_dirty(inode);
287 return dbh;
288 }
289
290 static int udf_get_block(struct inode *inode, sector_t block,
291 struct buffer_head *bh_result, int create)
292 {
293 int err, new;
294 struct buffer_head *bh;
295 sector_t phys = 0;
296 struct udf_inode_info *iinfo;
297
298 if (!create) {
299 phys = udf_block_map(inode, block);
300 if (phys)
301 map_bh(bh_result, inode->i_sb, phys);
302 return 0;
303 }
304
305 err = -EIO;
306 new = 0;
307 bh = NULL;
308
309 lock_kernel();
310
311 iinfo = UDF_I(inode);
312 if (block == iinfo->i_next_alloc_block + 1) {
313 iinfo->i_next_alloc_block++;
314 iinfo->i_next_alloc_goal++;
315 }
316
317 err = 0;
318
319 bh = inode_getblk(inode, block, &err, &phys, &new);
320 BUG_ON(bh);
321 if (err)
322 goto abort;
323 BUG_ON(!phys);
324
325 if (new)
326 set_buffer_new(bh_result);
327 map_bh(bh_result, inode->i_sb, phys);
328
329 abort:
330 unlock_kernel();
331 return err;
332 }
333
334 static struct buffer_head *udf_getblk(struct inode *inode, long block,
335 int create, int *err)
336 {
337 struct buffer_head *bh;
338 struct buffer_head dummy;
339
340 dummy.b_state = 0;
341 dummy.b_blocknr = -1000;
342 *err = udf_get_block(inode, block, &dummy, create);
343 if (!*err && buffer_mapped(&dummy)) {
344 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
345 if (buffer_new(&dummy)) {
346 lock_buffer(bh);
347 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
348 set_buffer_uptodate(bh);
349 unlock_buffer(bh);
350 mark_buffer_dirty_inode(bh, inode);
351 }
352 return bh;
353 }
354
355 return NULL;
356 }
357
358 /* Extend the file by 'blocks' blocks, return the number of extents added */
359 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
360 kernel_long_ad *last_ext, sector_t blocks)
361 {
362 sector_t add;
363 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
364 struct super_block *sb = inode->i_sb;
365 kernel_lb_addr prealloc_loc = {};
366 int prealloc_len = 0;
367 struct udf_inode_info *iinfo;
368
369 /* The previous extent is fake and we should not extend by anything
370 * - there's nothing to do... */
371 if (!blocks && fake)
372 return 0;
373
374 iinfo = UDF_I(inode);
375 /* Round the last extent up to a multiple of block size */
376 if (last_ext->extLength & (sb->s_blocksize - 1)) {
377 last_ext->extLength =
378 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
379 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
380 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
381 iinfo->i_lenExtents =
382 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
383 ~(sb->s_blocksize - 1);
384 }
385
386 /* Last extent are just preallocated blocks? */
387 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
388 EXT_NOT_RECORDED_ALLOCATED) {
389 /* Save the extent so that we can reattach it to the end */
390 prealloc_loc = last_ext->extLocation;
391 prealloc_len = last_ext->extLength;
392 /* Mark the extent as a hole */
393 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
394 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
395 last_ext->extLocation.logicalBlockNum = 0;
396 last_ext->extLocation.partitionReferenceNum = 0;
397 }
398
399 /* Can we merge with the previous extent? */
400 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
401 EXT_NOT_RECORDED_NOT_ALLOCATED) {
402 add = ((1 << 30) - sb->s_blocksize -
403 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
404 sb->s_blocksize_bits;
405 if (add > blocks)
406 add = blocks;
407 blocks -= add;
408 last_ext->extLength += add << sb->s_blocksize_bits;
409 }
410
411 if (fake) {
412 udf_add_aext(inode, last_pos, last_ext->extLocation,
413 last_ext->extLength, 1);
414 count++;
415 } else
416 udf_write_aext(inode, last_pos, last_ext->extLocation,
417 last_ext->extLength, 1);
418
419 /* Managed to do everything necessary? */
420 if (!blocks)
421 goto out;
422
423 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
424 last_ext->extLocation.logicalBlockNum = 0;
425 last_ext->extLocation.partitionReferenceNum = 0;
426 add = (1 << (30-sb->s_blocksize_bits)) - 1;
427 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
428 (add << sb->s_blocksize_bits);
429
430 /* Create enough extents to cover the whole hole */
431 while (blocks > add) {
432 blocks -= add;
433 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
434 last_ext->extLength, 1) == -1)
435 return -1;
436 count++;
437 }
438 if (blocks) {
439 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
440 (blocks << sb->s_blocksize_bits);
441 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
442 last_ext->extLength, 1) == -1)
443 return -1;
444 count++;
445 }
446
447 out:
448 /* Do we have some preallocated blocks saved? */
449 if (prealloc_len) {
450 if (udf_add_aext(inode, last_pos, prealloc_loc,
451 prealloc_len, 1) == -1)
452 return -1;
453 last_ext->extLocation = prealloc_loc;
454 last_ext->extLength = prealloc_len;
455 count++;
456 }
457
458 /* last_pos should point to the last written extent... */
459 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
460 last_pos->offset -= sizeof(short_ad);
461 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
462 last_pos->offset -= sizeof(long_ad);
463 else
464 return -1;
465
466 return count;
467 }
468
469 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
470 int *err, sector_t *phys, int *new)
471 {
472 static sector_t last_block;
473 struct buffer_head *result = NULL;
474 kernel_long_ad laarr[EXTENT_MERGE_SIZE];
475 struct extent_position prev_epos, cur_epos, next_epos;
476 int count = 0, startnum = 0, endnum = 0;
477 uint32_t elen = 0, tmpelen;
478 kernel_lb_addr eloc, tmpeloc;
479 int c = 1;
480 loff_t lbcount = 0, b_off = 0;
481 uint32_t newblocknum, newblock;
482 sector_t offset = 0;
483 int8_t etype;
484 struct udf_inode_info *iinfo = UDF_I(inode);
485 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
486 int lastblock = 0;
487
488 prev_epos.offset = udf_file_entry_alloc_offset(inode);
489 prev_epos.block = iinfo->i_location;
490 prev_epos.bh = NULL;
491 cur_epos = next_epos = prev_epos;
492 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
493
494 /* find the extent which contains the block we are looking for.
495 alternate between laarr[0] and laarr[1] for locations of the
496 current extent, and the previous extent */
497 do {
498 if (prev_epos.bh != cur_epos.bh) {
499 brelse(prev_epos.bh);
500 get_bh(cur_epos.bh);
501 prev_epos.bh = cur_epos.bh;
502 }
503 if (cur_epos.bh != next_epos.bh) {
504 brelse(cur_epos.bh);
505 get_bh(next_epos.bh);
506 cur_epos.bh = next_epos.bh;
507 }
508
509 lbcount += elen;
510
511 prev_epos.block = cur_epos.block;
512 cur_epos.block = next_epos.block;
513
514 prev_epos.offset = cur_epos.offset;
515 cur_epos.offset = next_epos.offset;
516
517 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
518 if (etype == -1)
519 break;
520
521 c = !c;
522
523 laarr[c].extLength = (etype << 30) | elen;
524 laarr[c].extLocation = eloc;
525
526 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
527 pgoal = eloc.logicalBlockNum +
528 ((elen + inode->i_sb->s_blocksize - 1) >>
529 inode->i_sb->s_blocksize_bits);
530
531 count++;
532 } while (lbcount + elen <= b_off);
533
534 b_off -= lbcount;
535 offset = b_off >> inode->i_sb->s_blocksize_bits;
536 /*
537 * Move prev_epos and cur_epos into indirect extent if we are at
538 * the pointer to it
539 */
540 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
541 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
542
543 /* if the extent is allocated and recorded, return the block
544 if the extent is not a multiple of the blocksize, round up */
545
546 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
547 if (elen & (inode->i_sb->s_blocksize - 1)) {
548 elen = EXT_RECORDED_ALLOCATED |
549 ((elen + inode->i_sb->s_blocksize - 1) &
550 ~(inode->i_sb->s_blocksize - 1));
551 etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
552 }
553 brelse(prev_epos.bh);
554 brelse(cur_epos.bh);
555 brelse(next_epos.bh);
556 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
557 *phys = newblock;
558 return NULL;
559 }
560
561 last_block = block;
562 /* Are we beyond EOF? */
563 if (etype == -1) {
564 int ret;
565
566 if (count) {
567 if (c)
568 laarr[0] = laarr[1];
569 startnum = 1;
570 } else {
571 /* Create a fake extent when there's not one */
572 memset(&laarr[0].extLocation, 0x00,
573 sizeof(kernel_lb_addr));
574 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
575 /* Will udf_extend_file() create real extent from
576 a fake one? */
577 startnum = (offset > 0);
578 }
579 /* Create extents for the hole between EOF and offset */
580 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
581 if (ret == -1) {
582 brelse(prev_epos.bh);
583 brelse(cur_epos.bh);
584 brelse(next_epos.bh);
585 /* We don't really know the error here so we just make
586 * something up */
587 *err = -ENOSPC;
588 return NULL;
589 }
590 c = 0;
591 offset = 0;
592 count += ret;
593 /* We are not covered by a preallocated extent? */
594 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
595 EXT_NOT_RECORDED_ALLOCATED) {
596 /* Is there any real extent? - otherwise we overwrite
597 * the fake one... */
598 if (count)
599 c = !c;
600 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
601 inode->i_sb->s_blocksize;
602 memset(&laarr[c].extLocation, 0x00,
603 sizeof(kernel_lb_addr));
604 count++;
605 endnum++;
606 }
607 endnum = c + 1;
608 lastblock = 1;
609 } else {
610 endnum = startnum = ((count > 2) ? 2 : count);
611
612 /* if the current extent is in position 0,
613 swap it with the previous */
614 if (!c && count != 1) {
615 laarr[2] = laarr[0];
616 laarr[0] = laarr[1];
617 laarr[1] = laarr[2];
618 c = 1;
619 }
620
621 /* if the current block is located in an extent,
622 read the next extent */
623 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
624 if (etype != -1) {
625 laarr[c + 1].extLength = (etype << 30) | elen;
626 laarr[c + 1].extLocation = eloc;
627 count++;
628 startnum++;
629 endnum++;
630 } else
631 lastblock = 1;
632 }
633
634 /* if the current extent is not recorded but allocated, get the
635 * block in the extent corresponding to the requested block */
636 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
637 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
638 else { /* otherwise, allocate a new block */
639 if (iinfo->i_next_alloc_block == block)
640 goal = iinfo->i_next_alloc_goal;
641
642 if (!goal) {
643 if (!(goal = pgoal)) /* XXX: what was intended here? */
644 goal = iinfo->i_location.logicalBlockNum + 1;
645 }
646
647 newblocknum = udf_new_block(inode->i_sb, inode,
648 iinfo->i_location.partitionReferenceNum,
649 goal, err);
650 if (!newblocknum) {
651 brelse(prev_epos.bh);
652 *err = -ENOSPC;
653 return NULL;
654 }
655 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
656 }
657
658 /* if the extent the requsted block is located in contains multiple
659 * blocks, split the extent into at most three extents. blocks prior
660 * to requested block, requested block, and blocks after requested
661 * block */
662 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
663
664 #ifdef UDF_PREALLOCATE
665 /* preallocate blocks */
666 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
667 #endif
668
669 /* merge any continuous blocks in laarr */
670 udf_merge_extents(inode, laarr, &endnum);
671
672 /* write back the new extents, inserting new extents if the new number
673 * of extents is greater than the old number, and deleting extents if
674 * the new number of extents is less than the old number */
675 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
676
677 brelse(prev_epos.bh);
678
679 newblock = udf_get_pblock(inode->i_sb, newblocknum,
680 iinfo->i_location.partitionReferenceNum, 0);
681 if (!newblock)
682 return NULL;
683 *phys = newblock;
684 *err = 0;
685 *new = 1;
686 iinfo->i_next_alloc_block = block;
687 iinfo->i_next_alloc_goal = newblocknum;
688 inode->i_ctime = current_fs_time(inode->i_sb);
689
690 if (IS_SYNC(inode))
691 udf_sync_inode(inode);
692 else
693 mark_inode_dirty(inode);
694
695 return result;
696 }
697
698 static void udf_split_extents(struct inode *inode, int *c, int offset,
699 int newblocknum,
700 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
701 int *endnum)
702 {
703 unsigned long blocksize = inode->i_sb->s_blocksize;
704 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
705
706 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
707 (laarr[*c].extLength >> 30) ==
708 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
709 int curr = *c;
710 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
711 blocksize - 1) >> blocksize_bits;
712 int8_t etype = (laarr[curr].extLength >> 30);
713
714 if (blen == 1)
715 ;
716 else if (!offset || blen == offset + 1) {
717 laarr[curr + 2] = laarr[curr + 1];
718 laarr[curr + 1] = laarr[curr];
719 } else {
720 laarr[curr + 3] = laarr[curr + 1];
721 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
722 }
723
724 if (offset) {
725 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
726 udf_free_blocks(inode->i_sb, inode,
727 laarr[curr].extLocation,
728 0, offset);
729 laarr[curr].extLength =
730 EXT_NOT_RECORDED_NOT_ALLOCATED |
731 (offset << blocksize_bits);
732 laarr[curr].extLocation.logicalBlockNum = 0;
733 laarr[curr].extLocation.
734 partitionReferenceNum = 0;
735 } else
736 laarr[curr].extLength = (etype << 30) |
737 (offset << blocksize_bits);
738 curr++;
739 (*c)++;
740 (*endnum)++;
741 }
742
743 laarr[curr].extLocation.logicalBlockNum = newblocknum;
744 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
745 laarr[curr].extLocation.partitionReferenceNum =
746 UDF_I(inode)->i_location.partitionReferenceNum;
747 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
748 blocksize;
749 curr++;
750
751 if (blen != offset + 1) {
752 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
753 laarr[curr].extLocation.logicalBlockNum +=
754 offset + 1;
755 laarr[curr].extLength = (etype << 30) |
756 ((blen - (offset + 1)) << blocksize_bits);
757 curr++;
758 (*endnum)++;
759 }
760 }
761 }
762
763 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
764 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
765 int *endnum)
766 {
767 int start, length = 0, currlength = 0, i;
768
769 if (*endnum >= (c + 1)) {
770 if (!lastblock)
771 return;
772 else
773 start = c;
774 } else {
775 if ((laarr[c + 1].extLength >> 30) ==
776 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
777 start = c + 1;
778 length = currlength =
779 (((laarr[c + 1].extLength &
780 UDF_EXTENT_LENGTH_MASK) +
781 inode->i_sb->s_blocksize - 1) >>
782 inode->i_sb->s_blocksize_bits);
783 } else
784 start = c;
785 }
786
787 for (i = start + 1; i <= *endnum; i++) {
788 if (i == *endnum) {
789 if (lastblock)
790 length += UDF_DEFAULT_PREALLOC_BLOCKS;
791 } else if ((laarr[i].extLength >> 30) ==
792 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
793 length += (((laarr[i].extLength &
794 UDF_EXTENT_LENGTH_MASK) +
795 inode->i_sb->s_blocksize - 1) >>
796 inode->i_sb->s_blocksize_bits);
797 } else
798 break;
799 }
800
801 if (length) {
802 int next = laarr[start].extLocation.logicalBlockNum +
803 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
804 inode->i_sb->s_blocksize - 1) >>
805 inode->i_sb->s_blocksize_bits);
806 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
807 laarr[start].extLocation.partitionReferenceNum,
808 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
809 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
810 currlength);
811 if (numalloc) {
812 if (start == (c + 1))
813 laarr[start].extLength +=
814 (numalloc <<
815 inode->i_sb->s_blocksize_bits);
816 else {
817 memmove(&laarr[c + 2], &laarr[c + 1],
818 sizeof(long_ad) * (*endnum - (c + 1)));
819 (*endnum)++;
820 laarr[c + 1].extLocation.logicalBlockNum = next;
821 laarr[c + 1].extLocation.partitionReferenceNum =
822 laarr[c].extLocation.
823 partitionReferenceNum;
824 laarr[c + 1].extLength =
825 EXT_NOT_RECORDED_ALLOCATED |
826 (numalloc <<
827 inode->i_sb->s_blocksize_bits);
828 start = c + 1;
829 }
830
831 for (i = start + 1; numalloc && i < *endnum; i++) {
832 int elen = ((laarr[i].extLength &
833 UDF_EXTENT_LENGTH_MASK) +
834 inode->i_sb->s_blocksize - 1) >>
835 inode->i_sb->s_blocksize_bits;
836
837 if (elen > numalloc) {
838 laarr[i].extLength -=
839 (numalloc <<
840 inode->i_sb->s_blocksize_bits);
841 numalloc = 0;
842 } else {
843 numalloc -= elen;
844 if (*endnum > (i + 1))
845 memmove(&laarr[i],
846 &laarr[i + 1],
847 sizeof(long_ad) *
848 (*endnum - (i + 1)));
849 i--;
850 (*endnum)--;
851 }
852 }
853 UDF_I(inode)->i_lenExtents +=
854 numalloc << inode->i_sb->s_blocksize_bits;
855 }
856 }
857 }
858
859 static void udf_merge_extents(struct inode *inode,
860 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
861 int *endnum)
862 {
863 int i;
864 unsigned long blocksize = inode->i_sb->s_blocksize;
865 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
866
867 for (i = 0; i < (*endnum - 1); i++) {
868 kernel_long_ad *li /*l[i]*/ = &laarr[i];
869 kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
870
871 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
872 (((li->extLength >> 30) ==
873 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
874 ((lip1->extLocation.logicalBlockNum -
875 li->extLocation.logicalBlockNum) ==
876 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
877 blocksize - 1) >> blocksize_bits)))) {
878
879 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
880 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
881 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
882 lip1->extLength = (lip1->extLength -
883 (li->extLength &
884 UDF_EXTENT_LENGTH_MASK) +
885 UDF_EXTENT_LENGTH_MASK) &
886 ~(blocksize - 1);
887 li->extLength = (li->extLength &
888 UDF_EXTENT_FLAG_MASK) +
889 (UDF_EXTENT_LENGTH_MASK + 1) -
890 blocksize;
891 lip1->extLocation.logicalBlockNum =
892 li->extLocation.logicalBlockNum +
893 ((li->extLength &
894 UDF_EXTENT_LENGTH_MASK) >>
895 blocksize_bits);
896 } else {
897 li->extLength = lip1->extLength +
898 (((li->extLength &
899 UDF_EXTENT_LENGTH_MASK) +
900 blocksize - 1) & ~(blocksize - 1));
901 if (*endnum > (i + 2))
902 memmove(&laarr[i + 1], &laarr[i + 2],
903 sizeof(long_ad) *
904 (*endnum - (i + 2)));
905 i--;
906 (*endnum)--;
907 }
908 } else if (((li->extLength >> 30) ==
909 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
910 ((lip1->extLength >> 30) ==
911 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
912 udf_free_blocks(inode->i_sb, inode, li->extLocation, 0,
913 ((li->extLength &
914 UDF_EXTENT_LENGTH_MASK) +
915 blocksize - 1) >> blocksize_bits);
916 li->extLocation.logicalBlockNum = 0;
917 li->extLocation.partitionReferenceNum = 0;
918
919 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
920 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
921 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
922 lip1->extLength = (lip1->extLength -
923 (li->extLength &
924 UDF_EXTENT_LENGTH_MASK) +
925 UDF_EXTENT_LENGTH_MASK) &
926 ~(blocksize - 1);
927 li->extLength = (li->extLength &
928 UDF_EXTENT_FLAG_MASK) +
929 (UDF_EXTENT_LENGTH_MASK + 1) -
930 blocksize;
931 } else {
932 li->extLength = lip1->extLength +
933 (((li->extLength &
934 UDF_EXTENT_LENGTH_MASK) +
935 blocksize - 1) & ~(blocksize - 1));
936 if (*endnum > (i + 2))
937 memmove(&laarr[i + 1], &laarr[i + 2],
938 sizeof(long_ad) *
939 (*endnum - (i + 2)));
940 i--;
941 (*endnum)--;
942 }
943 } else if ((li->extLength >> 30) ==
944 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
945 udf_free_blocks(inode->i_sb, inode,
946 li->extLocation, 0,
947 ((li->extLength &
948 UDF_EXTENT_LENGTH_MASK) +
949 blocksize - 1) >> blocksize_bits);
950 li->extLocation.logicalBlockNum = 0;
951 li->extLocation.partitionReferenceNum = 0;
952 li->extLength = (li->extLength &
953 UDF_EXTENT_LENGTH_MASK) |
954 EXT_NOT_RECORDED_NOT_ALLOCATED;
955 }
956 }
957 }
958
959 static void udf_update_extents(struct inode *inode,
960 kernel_long_ad laarr[EXTENT_MERGE_SIZE],
961 int startnum, int endnum,
962 struct extent_position *epos)
963 {
964 int start = 0, i;
965 kernel_lb_addr tmploc;
966 uint32_t tmplen;
967
968 if (startnum > endnum) {
969 for (i = 0; i < (startnum - endnum); i++)
970 udf_delete_aext(inode, *epos, laarr[i].extLocation,
971 laarr[i].extLength);
972 } else if (startnum < endnum) {
973 for (i = 0; i < (endnum - startnum); i++) {
974 udf_insert_aext(inode, *epos, laarr[i].extLocation,
975 laarr[i].extLength);
976 udf_next_aext(inode, epos, &laarr[i].extLocation,
977 &laarr[i].extLength, 1);
978 start++;
979 }
980 }
981
982 for (i = start; i < endnum; i++) {
983 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
984 udf_write_aext(inode, epos, laarr[i].extLocation,
985 laarr[i].extLength, 1);
986 }
987 }
988
989 struct buffer_head *udf_bread(struct inode *inode, int block,
990 int create, int *err)
991 {
992 struct buffer_head *bh = NULL;
993
994 bh = udf_getblk(inode, block, create, err);
995 if (!bh)
996 return NULL;
997
998 if (buffer_uptodate(bh))
999 return bh;
1000
1001 ll_rw_block(READ, 1, &bh);
1002
1003 wait_on_buffer(bh);
1004 if (buffer_uptodate(bh))
1005 return bh;
1006
1007 brelse(bh);
1008 *err = -EIO;
1009 return NULL;
1010 }
1011
1012 void udf_truncate(struct inode *inode)
1013 {
1014 int offset;
1015 int err;
1016 struct udf_inode_info *iinfo;
1017
1018 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1019 S_ISLNK(inode->i_mode)))
1020 return;
1021 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1022 return;
1023
1024 lock_kernel();
1025 iinfo = UDF_I(inode);
1026 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1027 if (inode->i_sb->s_blocksize <
1028 (udf_file_entry_alloc_offset(inode) +
1029 inode->i_size)) {
1030 udf_expand_file_adinicb(inode, inode->i_size, &err);
1031 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1032 inode->i_size = iinfo->i_lenAlloc;
1033 unlock_kernel();
1034 return;
1035 } else
1036 udf_truncate_extents(inode);
1037 } else {
1038 offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1039 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1040 0x00, inode->i_sb->s_blocksize -
1041 offset - udf_file_entry_alloc_offset(inode));
1042 iinfo->i_lenAlloc = inode->i_size;
1043 }
1044 } else {
1045 block_truncate_page(inode->i_mapping, inode->i_size,
1046 udf_get_block);
1047 udf_truncate_extents(inode);
1048 }
1049
1050 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1051 if (IS_SYNC(inode))
1052 udf_sync_inode(inode);
1053 else
1054 mark_inode_dirty(inode);
1055 unlock_kernel();
1056 }
1057
1058 static void __udf_read_inode(struct inode *inode)
1059 {
1060 struct buffer_head *bh = NULL;
1061 struct fileEntry *fe;
1062 uint16_t ident;
1063 struct udf_inode_info *iinfo = UDF_I(inode);
1064
1065 /*
1066 * Set defaults, but the inode is still incomplete!
1067 * Note: get_new_inode() sets the following on a new inode:
1068 * i_sb = sb
1069 * i_no = ino
1070 * i_flags = sb->s_flags
1071 * i_state = 0
1072 * clean_inode(): zero fills and sets
1073 * i_count = 1
1074 * i_nlink = 1
1075 * i_op = NULL;
1076 */
1077 bh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 0, &ident);
1078 if (!bh) {
1079 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1080 inode->i_ino);
1081 make_bad_inode(inode);
1082 return;
1083 }
1084
1085 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1086 ident != TAG_IDENT_USE) {
1087 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1088 "failed ident=%d\n", inode->i_ino, ident);
1089 brelse(bh);
1090 make_bad_inode(inode);
1091 return;
1092 }
1093
1094 fe = (struct fileEntry *)bh->b_data;
1095
1096 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1097 struct buffer_head *ibh;
1098
1099 ibh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 1,
1100 &ident);
1101 if (ident == TAG_IDENT_IE && ibh) {
1102 struct buffer_head *nbh = NULL;
1103 kernel_lb_addr loc;
1104 struct indirectEntry *ie;
1105
1106 ie = (struct indirectEntry *)ibh->b_data;
1107 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1108
1109 if (ie->indirectICB.extLength &&
1110 (nbh = udf_read_ptagged(inode->i_sb, loc, 0,
1111 &ident))) {
1112 if (ident == TAG_IDENT_FE ||
1113 ident == TAG_IDENT_EFE) {
1114 memcpy(&iinfo->i_location,
1115 &loc,
1116 sizeof(kernel_lb_addr));
1117 brelse(bh);
1118 brelse(ibh);
1119 brelse(nbh);
1120 __udf_read_inode(inode);
1121 return;
1122 }
1123 brelse(nbh);
1124 }
1125 }
1126 brelse(ibh);
1127 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1128 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1129 le16_to_cpu(fe->icbTag.strategyType));
1130 brelse(bh);
1131 make_bad_inode(inode);
1132 return;
1133 }
1134 udf_fill_inode(inode, bh);
1135
1136 brelse(bh);
1137 }
1138
1139 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1140 {
1141 struct fileEntry *fe;
1142 struct extendedFileEntry *efe;
1143 time_t convtime;
1144 long convtime_usec;
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_stamp_to_time(&convtime, &convtime_usec,
1233 lets_to_cpu(fe->accessTime))) {
1234 inode->i_atime.tv_sec = convtime;
1235 inode->i_atime.tv_nsec = convtime_usec * 1000;
1236 } else {
1237 inode->i_atime = sbi->s_record_time;
1238 }
1239
1240 if (udf_stamp_to_time(&convtime, &convtime_usec,
1241 lets_to_cpu(fe->modificationTime))) {
1242 inode->i_mtime.tv_sec = convtime;
1243 inode->i_mtime.tv_nsec = convtime_usec * 1000;
1244 } else {
1245 inode->i_mtime = sbi->s_record_time;
1246 }
1247
1248 if (udf_stamp_to_time(&convtime, &convtime_usec,
1249 lets_to_cpu(fe->attrTime))) {
1250 inode->i_ctime.tv_sec = convtime;
1251 inode->i_ctime.tv_nsec = convtime_usec * 1000;
1252 } else {
1253 inode->i_ctime = sbi->s_record_time;
1254 }
1255
1256 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1257 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1258 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1259 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1260 } else {
1261 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1262 (inode->i_sb->s_blocksize_bits - 9);
1263
1264 if (udf_stamp_to_time(&convtime, &convtime_usec,
1265 lets_to_cpu(efe->accessTime))) {
1266 inode->i_atime.tv_sec = convtime;
1267 inode->i_atime.tv_nsec = convtime_usec * 1000;
1268 } else {
1269 inode->i_atime = sbi->s_record_time;
1270 }
1271
1272 if (udf_stamp_to_time(&convtime, &convtime_usec,
1273 lets_to_cpu(efe->modificationTime))) {
1274 inode->i_mtime.tv_sec = convtime;
1275 inode->i_mtime.tv_nsec = convtime_usec * 1000;
1276 } else {
1277 inode->i_mtime = sbi->s_record_time;
1278 }
1279
1280 if (udf_stamp_to_time(&convtime, &convtime_usec,
1281 lets_to_cpu(efe->createTime))) {
1282 iinfo->i_crtime.tv_sec = convtime;
1283 iinfo->i_crtime.tv_nsec = convtime_usec * 1000;
1284 } else {
1285 iinfo->i_crtime = sbi->s_record_time;
1286 }
1287
1288 if (udf_stamp_to_time(&convtime, &convtime_usec,
1289 lets_to_cpu(efe->attrTime))) {
1290 inode->i_ctime.tv_sec = convtime;
1291 inode->i_ctime.tv_nsec = convtime_usec * 1000;
1292 } else {
1293 inode->i_ctime = sbi->s_record_time;
1294 }
1295
1296 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1297 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1298 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1299 offset = sizeof(struct extendedFileEntry) +
1300 iinfo->i_lenEAttr;
1301 }
1302
1303 switch (fe->icbTag.fileType) {
1304 case ICBTAG_FILE_TYPE_DIRECTORY:
1305 inode->i_op = &udf_dir_inode_operations;
1306 inode->i_fop = &udf_dir_operations;
1307 inode->i_mode |= S_IFDIR;
1308 inc_nlink(inode);
1309 break;
1310 case ICBTAG_FILE_TYPE_REALTIME:
1311 case ICBTAG_FILE_TYPE_REGULAR:
1312 case ICBTAG_FILE_TYPE_UNDEF:
1313 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1314 inode->i_data.a_ops = &udf_adinicb_aops;
1315 else
1316 inode->i_data.a_ops = &udf_aops;
1317 inode->i_op = &udf_file_inode_operations;
1318 inode->i_fop = &udf_file_operations;
1319 inode->i_mode |= S_IFREG;
1320 break;
1321 case ICBTAG_FILE_TYPE_BLOCK:
1322 inode->i_mode |= S_IFBLK;
1323 break;
1324 case ICBTAG_FILE_TYPE_CHAR:
1325 inode->i_mode |= S_IFCHR;
1326 break;
1327 case ICBTAG_FILE_TYPE_FIFO:
1328 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1329 break;
1330 case ICBTAG_FILE_TYPE_SOCKET:
1331 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1332 break;
1333 case ICBTAG_FILE_TYPE_SYMLINK:
1334 inode->i_data.a_ops = &udf_symlink_aops;
1335 inode->i_op = &page_symlink_inode_operations;
1336 inode->i_mode = S_IFLNK | S_IRWXUGO;
1337 break;
1338 default:
1339 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1340 "file type=%d\n", inode->i_ino,
1341 fe->icbTag.fileType);
1342 make_bad_inode(inode);
1343 return;
1344 }
1345 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1346 struct deviceSpec *dsea =
1347 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1348 if (dsea) {
1349 init_special_inode(inode, inode->i_mode,
1350 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1351 le32_to_cpu(dsea->minorDeviceIdent)));
1352 /* Developer ID ??? */
1353 } else
1354 make_bad_inode(inode);
1355 }
1356 }
1357
1358 static int udf_alloc_i_data(struct inode *inode, size_t size)
1359 {
1360 struct udf_inode_info *iinfo = UDF_I(inode);
1361 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1362
1363 if (!iinfo->i_ext.i_data) {
1364 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1365 "no free memory\n", inode->i_ino);
1366 return -ENOMEM;
1367 }
1368
1369 return 0;
1370 }
1371
1372 static mode_t udf_convert_permissions(struct fileEntry *fe)
1373 {
1374 mode_t mode;
1375 uint32_t permissions;
1376 uint32_t flags;
1377
1378 permissions = le32_to_cpu(fe->permissions);
1379 flags = le16_to_cpu(fe->icbTag.flags);
1380
1381 mode = ((permissions) & S_IRWXO) |
1382 ((permissions >> 2) & S_IRWXG) |
1383 ((permissions >> 4) & S_IRWXU) |
1384 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1385 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1386 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1387
1388 return mode;
1389 }
1390
1391 int udf_write_inode(struct inode *inode, int sync)
1392 {
1393 int ret;
1394
1395 lock_kernel();
1396 ret = udf_update_inode(inode, sync);
1397 unlock_kernel();
1398
1399 return ret;
1400 }
1401
1402 int udf_sync_inode(struct inode *inode)
1403 {
1404 return udf_update_inode(inode, 1);
1405 }
1406
1407 static int udf_update_inode(struct inode *inode, int do_sync)
1408 {
1409 struct buffer_head *bh = NULL;
1410 struct fileEntry *fe;
1411 struct extendedFileEntry *efe;
1412 uint32_t udfperms;
1413 uint16_t icbflags;
1414 uint16_t crclen;
1415 kernel_timestamp cpu_time;
1416 int err = 0;
1417 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1418 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1419 struct udf_inode_info *iinfo = UDF_I(inode);
1420
1421 bh = udf_tread(inode->i_sb,
1422 udf_get_lb_pblock(inode->i_sb,
1423 iinfo->i_location, 0));
1424 if (!bh) {
1425 udf_debug("bread failure\n");
1426 return -EIO;
1427 }
1428
1429 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1430
1431 fe = (struct fileEntry *)bh->b_data;
1432 efe = (struct extendedFileEntry *)bh->b_data;
1433
1434 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1435 struct unallocSpaceEntry *use =
1436 (struct unallocSpaceEntry *)bh->b_data;
1437
1438 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1439 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1440 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1441 sizeof(struct unallocSpaceEntry));
1442 crclen = sizeof(struct unallocSpaceEntry) +
1443 iinfo->i_lenAlloc - sizeof(tag);
1444 use->descTag.tagLocation = cpu_to_le32(
1445 iinfo->i_location.
1446 logicalBlockNum);
1447 use->descTag.descCRCLength = cpu_to_le16(crclen);
1448 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use +
1449 sizeof(tag), crclen,
1450 0));
1451 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1452
1453 mark_buffer_dirty(bh);
1454 brelse(bh);
1455 return err;
1456 }
1457
1458 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1459 fe->uid = cpu_to_le32(-1);
1460 else
1461 fe->uid = cpu_to_le32(inode->i_uid);
1462
1463 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1464 fe->gid = cpu_to_le32(-1);
1465 else
1466 fe->gid = cpu_to_le32(inode->i_gid);
1467
1468 udfperms = ((inode->i_mode & S_IRWXO)) |
1469 ((inode->i_mode & S_IRWXG) << 2) |
1470 ((inode->i_mode & S_IRWXU) << 4);
1471
1472 udfperms |= (le32_to_cpu(fe->permissions) &
1473 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1474 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1475 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1476 fe->permissions = cpu_to_le32(udfperms);
1477
1478 if (S_ISDIR(inode->i_mode))
1479 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1480 else
1481 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1482
1483 fe->informationLength = cpu_to_le64(inode->i_size);
1484
1485 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1486 regid *eid;
1487 struct deviceSpec *dsea =
1488 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1489 if (!dsea) {
1490 dsea = (struct deviceSpec *)
1491 udf_add_extendedattr(inode,
1492 sizeof(struct deviceSpec) +
1493 sizeof(regid), 12, 0x3);
1494 dsea->attrType = cpu_to_le32(12);
1495 dsea->attrSubtype = 1;
1496 dsea->attrLength = cpu_to_le32(
1497 sizeof(struct deviceSpec) +
1498 sizeof(regid));
1499 dsea->impUseLength = cpu_to_le32(sizeof(regid));
1500 }
1501 eid = (regid *)dsea->impUse;
1502 memset(eid, 0, sizeof(regid));
1503 strcpy(eid->ident, UDF_ID_DEVELOPER);
1504 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1505 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1506 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1507 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1508 }
1509
1510 if (iinfo->i_efe == 0) {
1511 memcpy(bh->b_data + sizeof(struct fileEntry),
1512 iinfo->i_ext.i_data,
1513 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1514 fe->logicalBlocksRecorded = cpu_to_le64(
1515 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1516 (blocksize_bits - 9));
1517
1518 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1519 fe->accessTime = cpu_to_lets(cpu_time);
1520 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1521 fe->modificationTime = cpu_to_lets(cpu_time);
1522 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1523 fe->attrTime = cpu_to_lets(cpu_time);
1524 memset(&(fe->impIdent), 0, sizeof(regid));
1525 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1526 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1527 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1528 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1529 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1530 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1531 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1532 crclen = sizeof(struct fileEntry);
1533 } else {
1534 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1535 iinfo->i_ext.i_data,
1536 inode->i_sb->s_blocksize -
1537 sizeof(struct extendedFileEntry));
1538 efe->objectSize = cpu_to_le64(inode->i_size);
1539 efe->logicalBlocksRecorded = cpu_to_le64(
1540 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1541 (blocksize_bits - 9));
1542
1543 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1544 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1545 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1546 iinfo->i_crtime = inode->i_atime;
1547
1548 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1549 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1550 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1551 iinfo->i_crtime = inode->i_mtime;
1552
1553 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1554 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1555 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1556 iinfo->i_crtime = inode->i_ctime;
1557
1558 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1559 efe->accessTime = cpu_to_lets(cpu_time);
1560 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1561 efe->modificationTime = cpu_to_lets(cpu_time);
1562 if (udf_time_to_stamp(&cpu_time, iinfo->i_crtime))
1563 efe->createTime = cpu_to_lets(cpu_time);
1564 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1565 efe->attrTime = cpu_to_lets(cpu_time);
1566
1567 memset(&(efe->impIdent), 0, sizeof(regid));
1568 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1569 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1570 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1571 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1572 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1573 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1574 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1575 crclen = sizeof(struct extendedFileEntry);
1576 }
1577 if (iinfo->i_strat4096) {
1578 fe->icbTag.strategyType = cpu_to_le16(4096);
1579 fe->icbTag.strategyParameter = cpu_to_le16(1);
1580 fe->icbTag.numEntries = cpu_to_le16(2);
1581 } else {
1582 fe->icbTag.strategyType = cpu_to_le16(4);
1583 fe->icbTag.numEntries = cpu_to_le16(1);
1584 }
1585
1586 if (S_ISDIR(inode->i_mode))
1587 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1588 else if (S_ISREG(inode->i_mode))
1589 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1590 else if (S_ISLNK(inode->i_mode))
1591 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1592 else if (S_ISBLK(inode->i_mode))
1593 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1594 else if (S_ISCHR(inode->i_mode))
1595 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1596 else if (S_ISFIFO(inode->i_mode))
1597 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1598 else if (S_ISSOCK(inode->i_mode))
1599 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1600
1601 icbflags = iinfo->i_alloc_type |
1602 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1603 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1604 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1605 (le16_to_cpu(fe->icbTag.flags) &
1606 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1607 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1608
1609 fe->icbTag.flags = cpu_to_le16(icbflags);
1610 if (sbi->s_udfrev >= 0x0200)
1611 fe->descTag.descVersion = cpu_to_le16(3);
1612 else
1613 fe->descTag.descVersion = cpu_to_le16(2);
1614 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1615 fe->descTag.tagLocation = cpu_to_le32(
1616 iinfo->i_location.logicalBlockNum);
1617 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1618 sizeof(tag);
1619 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1620 fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag),
1621 crclen, 0));
1622 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1623
1624 /* write the data blocks */
1625 mark_buffer_dirty(bh);
1626 if (do_sync) {
1627 sync_dirty_buffer(bh);
1628 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1629 printk(KERN_WARNING "IO error syncing udf inode "
1630 "[%s:%08lx]\n", inode->i_sb->s_id,
1631 inode->i_ino);
1632 err = -EIO;
1633 }
1634 }
1635 brelse(bh);
1636
1637 return err;
1638 }
1639
1640 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1641 {
1642 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1643 struct inode *inode = iget_locked(sb, block);
1644
1645 if (!inode)
1646 return NULL;
1647
1648 if (inode->i_state & I_NEW) {
1649 memcpy(&UDF_I(inode)->i_location, &ino, sizeof(kernel_lb_addr));
1650 __udf_read_inode(inode);
1651 unlock_new_inode(inode);
1652 }
1653
1654 if (is_bad_inode(inode))
1655 goto out_iput;
1656
1657 if (ino.logicalBlockNum >= UDF_SB(sb)->
1658 s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1659 udf_debug("block=%d, partition=%d out of range\n",
1660 ino.logicalBlockNum, ino.partitionReferenceNum);
1661 make_bad_inode(inode);
1662 goto out_iput;
1663 }
1664
1665 return inode;
1666
1667 out_iput:
1668 iput(inode);
1669 return NULL;
1670 }
1671
1672 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1673 kernel_lb_addr eloc, uint32_t elen, int inc)
1674 {
1675 int adsize;
1676 short_ad *sad = NULL;
1677 long_ad *lad = NULL;
1678 struct allocExtDesc *aed;
1679 int8_t etype;
1680 uint8_t *ptr;
1681 struct udf_inode_info *iinfo = UDF_I(inode);
1682
1683 if (!epos->bh)
1684 ptr = iinfo->i_ext.i_data + epos->offset -
1685 udf_file_entry_alloc_offset(inode) +
1686 iinfo->i_lenEAttr;
1687 else
1688 ptr = epos->bh->b_data + epos->offset;
1689
1690 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1691 adsize = sizeof(short_ad);
1692 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1693 adsize = sizeof(long_ad);
1694 else
1695 return -1;
1696
1697 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1698 char *sptr, *dptr;
1699 struct buffer_head *nbh;
1700 int err, loffset;
1701 kernel_lb_addr obloc = epos->block;
1702
1703 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1704 obloc.partitionReferenceNum,
1705 obloc.logicalBlockNum, &err);
1706 if (!epos->block.logicalBlockNum)
1707 return -1;
1708 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1709 epos->block,
1710 0));
1711 if (!nbh)
1712 return -1;
1713 lock_buffer(nbh);
1714 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1715 set_buffer_uptodate(nbh);
1716 unlock_buffer(nbh);
1717 mark_buffer_dirty_inode(nbh, inode);
1718
1719 aed = (struct allocExtDesc *)(nbh->b_data);
1720 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1721 aed->previousAllocExtLocation =
1722 cpu_to_le32(obloc.logicalBlockNum);
1723 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1724 loffset = epos->offset;
1725 aed->lengthAllocDescs = cpu_to_le32(adsize);
1726 sptr = ptr - adsize;
1727 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1728 memcpy(dptr, sptr, adsize);
1729 epos->offset = sizeof(struct allocExtDesc) + adsize;
1730 } else {
1731 loffset = epos->offset + adsize;
1732 aed->lengthAllocDescs = cpu_to_le32(0);
1733 sptr = ptr;
1734 epos->offset = sizeof(struct allocExtDesc);
1735
1736 if (epos->bh) {
1737 aed = (struct allocExtDesc *)epos->bh->b_data;
1738 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1739 } else {
1740 iinfo->i_lenAlloc += adsize;
1741 mark_inode_dirty(inode);
1742 }
1743 }
1744 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1745 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1746 epos->block.logicalBlockNum, sizeof(tag));
1747 else
1748 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1749 epos->block.logicalBlockNum, sizeof(tag));
1750 switch (iinfo->i_alloc_type) {
1751 case ICBTAG_FLAG_AD_SHORT:
1752 sad = (short_ad *)sptr;
1753 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1754 inode->i_sb->s_blocksize);
1755 sad->extPosition =
1756 cpu_to_le32(epos->block.logicalBlockNum);
1757 break;
1758 case ICBTAG_FLAG_AD_LONG:
1759 lad = (long_ad *)sptr;
1760 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1761 inode->i_sb->s_blocksize);
1762 lad->extLocation = cpu_to_lelb(epos->block);
1763 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1764 break;
1765 }
1766 if (epos->bh) {
1767 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1768 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1769 udf_update_tag(epos->bh->b_data, loffset);
1770 else
1771 udf_update_tag(epos->bh->b_data,
1772 sizeof(struct allocExtDesc));
1773 mark_buffer_dirty_inode(epos->bh, inode);
1774 brelse(epos->bh);
1775 } else {
1776 mark_inode_dirty(inode);
1777 }
1778 epos->bh = nbh;
1779 }
1780
1781 etype = udf_write_aext(inode, epos, eloc, elen, inc);
1782
1783 if (!epos->bh) {
1784 iinfo->i_lenAlloc += adsize;
1785 mark_inode_dirty(inode);
1786 } else {
1787 aed = (struct allocExtDesc *)epos->bh->b_data;
1788 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1789 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1790 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1791 udf_update_tag(epos->bh->b_data,
1792 epos->offset + (inc ? 0 : adsize));
1793 else
1794 udf_update_tag(epos->bh->b_data,
1795 sizeof(struct allocExtDesc));
1796 mark_buffer_dirty_inode(epos->bh, inode);
1797 }
1798
1799 return etype;
1800 }
1801
1802 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1803 kernel_lb_addr eloc, uint32_t elen, int inc)
1804 {
1805 int adsize;
1806 uint8_t *ptr;
1807 short_ad *sad;
1808 long_ad *lad;
1809 struct udf_inode_info *iinfo = UDF_I(inode);
1810
1811 if (!epos->bh)
1812 ptr = iinfo->i_ext.i_data + epos->offset -
1813 udf_file_entry_alloc_offset(inode) +
1814 iinfo->i_lenEAttr;
1815 else
1816 ptr = epos->bh->b_data + epos->offset;
1817
1818 switch (iinfo->i_alloc_type) {
1819 case ICBTAG_FLAG_AD_SHORT:
1820 sad = (short_ad *)ptr;
1821 sad->extLength = cpu_to_le32(elen);
1822 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1823 adsize = sizeof(short_ad);
1824 break;
1825 case ICBTAG_FLAG_AD_LONG:
1826 lad = (long_ad *)ptr;
1827 lad->extLength = cpu_to_le32(elen);
1828 lad->extLocation = cpu_to_lelb(eloc);
1829 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1830 adsize = sizeof(long_ad);
1831 break;
1832 default:
1833 return -1;
1834 }
1835
1836 if (epos->bh) {
1837 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1838 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1839 struct allocExtDesc *aed =
1840 (struct allocExtDesc *)epos->bh->b_data;
1841 udf_update_tag(epos->bh->b_data,
1842 le32_to_cpu(aed->lengthAllocDescs) +
1843 sizeof(struct allocExtDesc));
1844 }
1845 mark_buffer_dirty_inode(epos->bh, inode);
1846 } else {
1847 mark_inode_dirty(inode);
1848 }
1849
1850 if (inc)
1851 epos->offset += adsize;
1852
1853 return (elen >> 30);
1854 }
1855
1856 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1857 kernel_lb_addr *eloc, uint32_t *elen, int inc)
1858 {
1859 int8_t etype;
1860
1861 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1862 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1863 int block;
1864 epos->block = *eloc;
1865 epos->offset = sizeof(struct allocExtDesc);
1866 brelse(epos->bh);
1867 block = udf_get_lb_pblock(inode->i_sb, epos->block, 0);
1868 epos->bh = udf_tread(inode->i_sb, block);
1869 if (!epos->bh) {
1870 udf_debug("reading block %d failed!\n", block);
1871 return -1;
1872 }
1873 }
1874
1875 return etype;
1876 }
1877
1878 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1879 kernel_lb_addr *eloc, uint32_t *elen, int inc)
1880 {
1881 int alen;
1882 int8_t etype;
1883 uint8_t *ptr;
1884 short_ad *sad;
1885 long_ad *lad;
1886 struct udf_inode_info *iinfo = UDF_I(inode);
1887
1888 if (!epos->bh) {
1889 if (!epos->offset)
1890 epos->offset = udf_file_entry_alloc_offset(inode);
1891 ptr = iinfo->i_ext.i_data + epos->offset -
1892 udf_file_entry_alloc_offset(inode) +
1893 iinfo->i_lenEAttr;
1894 alen = udf_file_entry_alloc_offset(inode) +
1895 iinfo->i_lenAlloc;
1896 } else {
1897 if (!epos->offset)
1898 epos->offset = sizeof(struct allocExtDesc);
1899 ptr = epos->bh->b_data + epos->offset;
1900 alen = sizeof(struct allocExtDesc) +
1901 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1902 lengthAllocDescs);
1903 }
1904
1905 switch (iinfo->i_alloc_type) {
1906 case ICBTAG_FLAG_AD_SHORT:
1907 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1908 if (!sad)
1909 return -1;
1910 etype = le32_to_cpu(sad->extLength) >> 30;
1911 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1912 eloc->partitionReferenceNum =
1913 iinfo->i_location.partitionReferenceNum;
1914 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1915 break;
1916 case ICBTAG_FLAG_AD_LONG:
1917 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1918 if (!lad)
1919 return -1;
1920 etype = le32_to_cpu(lad->extLength) >> 30;
1921 *eloc = lelb_to_cpu(lad->extLocation);
1922 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1923 break;
1924 default:
1925 udf_debug("alloc_type = %d unsupported\n",
1926 iinfo->i_alloc_type);
1927 return -1;
1928 }
1929
1930 return etype;
1931 }
1932
1933 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1934 kernel_lb_addr neloc, uint32_t nelen)
1935 {
1936 kernel_lb_addr oeloc;
1937 uint32_t oelen;
1938 int8_t etype;
1939
1940 if (epos.bh)
1941 get_bh(epos.bh);
1942
1943 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1944 udf_write_aext(inode, &epos, neloc, nelen, 1);
1945 neloc = oeloc;
1946 nelen = (etype << 30) | oelen;
1947 }
1948 udf_add_aext(inode, &epos, neloc, nelen, 1);
1949 brelse(epos.bh);
1950
1951 return (nelen >> 30);
1952 }
1953
1954 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1955 kernel_lb_addr eloc, uint32_t elen)
1956 {
1957 struct extent_position oepos;
1958 int adsize;
1959 int8_t etype;
1960 struct allocExtDesc *aed;
1961 struct udf_inode_info *iinfo;
1962
1963 if (epos.bh) {
1964 get_bh(epos.bh);
1965 get_bh(epos.bh);
1966 }
1967
1968 iinfo = UDF_I(inode);
1969 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1970 adsize = sizeof(short_ad);
1971 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1972 adsize = sizeof(long_ad);
1973 else
1974 adsize = 0;
1975
1976 oepos = epos;
1977 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1978 return -1;
1979
1980 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1981 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1982 if (oepos.bh != epos.bh) {
1983 oepos.block = epos.block;
1984 brelse(oepos.bh);
1985 get_bh(epos.bh);
1986 oepos.bh = epos.bh;
1987 oepos.offset = epos.offset - adsize;
1988 }
1989 }
1990 memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1991 elen = 0;
1992
1993 if (epos.bh != oepos.bh) {
1994 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
1995 udf_write_aext(inode, &oepos, eloc, elen, 1);
1996 udf_write_aext(inode, &oepos, eloc, elen, 1);
1997 if (!oepos.bh) {
1998 iinfo->i_lenAlloc -= (adsize * 2);
1999 mark_inode_dirty(inode);
2000 } else {
2001 aed = (struct allocExtDesc *)oepos.bh->b_data;
2002 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2003 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2004 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2005 udf_update_tag(oepos.bh->b_data,
2006 oepos.offset - (2 * adsize));
2007 else
2008 udf_update_tag(oepos.bh->b_data,
2009 sizeof(struct allocExtDesc));
2010 mark_buffer_dirty_inode(oepos.bh, inode);
2011 }
2012 } else {
2013 udf_write_aext(inode, &oepos, eloc, elen, 1);
2014 if (!oepos.bh) {
2015 iinfo->i_lenAlloc -= adsize;
2016 mark_inode_dirty(inode);
2017 } else {
2018 aed = (struct allocExtDesc *)oepos.bh->b_data;
2019 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2020 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2021 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2022 udf_update_tag(oepos.bh->b_data,
2023 epos.offset - adsize);
2024 else
2025 udf_update_tag(oepos.bh->b_data,
2026 sizeof(struct allocExtDesc));
2027 mark_buffer_dirty_inode(oepos.bh, inode);
2028 }
2029 }
2030
2031 brelse(epos.bh);
2032 brelse(oepos.bh);
2033
2034 return (elen >> 30);
2035 }
2036
2037 int8_t inode_bmap(struct inode *inode, sector_t block,
2038 struct extent_position *pos, kernel_lb_addr *eloc,
2039 uint32_t *elen, sector_t *offset)
2040 {
2041 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2042 loff_t lbcount = 0, bcount =
2043 (loff_t) block << blocksize_bits;
2044 int8_t etype;
2045 struct udf_inode_info *iinfo;
2046
2047 iinfo = UDF_I(inode);
2048 pos->offset = 0;
2049 pos->block = iinfo->i_location;
2050 pos->bh = NULL;
2051 *elen = 0;
2052
2053 do {
2054 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2055 if (etype == -1) {
2056 *offset = (bcount - lbcount) >> blocksize_bits;
2057 iinfo->i_lenExtents = lbcount;
2058 return -1;
2059 }
2060 lbcount += *elen;
2061 } while (lbcount <= bcount);
2062
2063 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2064
2065 return etype;
2066 }
2067
2068 long udf_block_map(struct inode *inode, sector_t block)
2069 {
2070 kernel_lb_addr eloc;
2071 uint32_t elen;
2072 sector_t offset;
2073 struct extent_position epos = {};
2074 int ret;
2075
2076 lock_kernel();
2077
2078 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2079 (EXT_RECORDED_ALLOCATED >> 30))
2080 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2081 else
2082 ret = 0;
2083
2084 unlock_kernel();
2085 brelse(epos.bh);
2086
2087 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2088 return udf_fixed_to_variable(ret);
2089 else
2090 return ret;
2091 }
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