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dquot: move dquot drop responsibility into the filesystem
[linux-2.6/kvm.git] / fs / udf / inode.c
blob859389a3832bdbd2602373758152c209662e6cbb
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 struct kernel_lb_addr, uint32_t);
59 static void udf_split_extents(struct inode *, int *, int, int,
60 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
61 static void udf_prealloc_extents(struct inode *, int, int,
62 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
63 static void udf_merge_extents(struct inode *,
64 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
65 static void udf_update_extents(struct inode *,
66 struct 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 truncate last inode extent
94 * to proper length. We could use drop_inode() but it's called under inode_lock
95 * and thus we cannot mark inode dirty there. We use clear_inode() but we have
96 * to make sure to write inode as it's not written automatically.
97 */
98 void udf_clear_inode(struct inode *inode)
99 {
100 struct udf_inode_info *iinfo = UDF_I(inode);
101
102 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
103 inode->i_size != iinfo->i_lenExtents) {
104 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
105 "inode size %llu different from extent lenght %llu. "
106 "Filesystem need not be standards compliant.\n",
107 inode->i_sb->s_id, inode->i_ino, inode->i_mode,
108 (unsigned long long)inode->i_size,
109 (unsigned long long)iinfo->i_lenExtents);
110 }
111
112 vfs_dq_drop(inode);
113 kfree(iinfo->i_ext.i_data);
114 iinfo->i_ext.i_data = NULL;
115 }
116
117 static int udf_writepage(struct page *page, struct writeback_control *wbc)
118 {
119 return block_write_full_page(page, udf_get_block, wbc);
120 }
121
122 static int udf_readpage(struct file *file, struct page *page)
123 {
124 return block_read_full_page(page, udf_get_block);
125 }
126
127 static int udf_write_begin(struct file *file, struct address_space *mapping,
128 loff_t pos, unsigned len, unsigned flags,
129 struct page **pagep, void **fsdata)
130 {
131 *pagep = NULL;
132 return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
133 udf_get_block);
134 }
135
136 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
137 {
138 return generic_block_bmap(mapping, block, udf_get_block);
139 }
140
141 const struct address_space_operations udf_aops = {
142 .readpage = udf_readpage,
143 .writepage = udf_writepage,
144 .sync_page = block_sync_page,
145 .write_begin = udf_write_begin,
146 .write_end = generic_write_end,
147 .bmap = udf_bmap,
148 };
149
150 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
151 {
152 struct page *page;
153 char *kaddr;
154 struct udf_inode_info *iinfo = UDF_I(inode);
155 struct writeback_control udf_wbc = {
156 .sync_mode = WB_SYNC_NONE,
157 .nr_to_write = 1,
158 };
159
160 /* from now on we have normal address_space methods */
161 inode->i_data.a_ops = &udf_aops;
162
163 if (!iinfo->i_lenAlloc) {
164 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
165 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
166 else
167 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
168 mark_inode_dirty(inode);
169 return;
170 }
171
172 page = grab_cache_page(inode->i_mapping, 0);
173 BUG_ON(!PageLocked(page));
174
175 if (!PageUptodate(page)) {
176 kaddr = kmap(page);
177 memset(kaddr + iinfo->i_lenAlloc, 0x00,
178 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
179 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
180 iinfo->i_lenAlloc);
181 flush_dcache_page(page);
182 SetPageUptodate(page);
183 kunmap(page);
184 }
185 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
186 iinfo->i_lenAlloc);
187 iinfo->i_lenAlloc = 0;
188 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
189 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
190 else
191 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
192
193 inode->i_data.a_ops->writepage(page, &udf_wbc);
194 page_cache_release(page);
195
196 mark_inode_dirty(inode);
197 }
198
199 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
200 int *err)
201 {
202 int newblock;
203 struct buffer_head *dbh = NULL;
204 struct kernel_lb_addr eloc;
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 iinfo->i_lenExtents = inode->i_size;
280 epos.bh = NULL;
281 epos.block = iinfo->i_location;
282 epos.offset = udf_file_entry_alloc_offset(inode);
283 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
284 /* UniqueID stuff */
285
286 brelse(epos.bh);
287 mark_inode_dirty(inode);
288 return dbh;
289 }
290
291 static int udf_get_block(struct inode *inode, sector_t block,
292 struct buffer_head *bh_result, int create)
293 {
294 int err, new;
295 struct buffer_head *bh;
296 sector_t phys = 0;
297 struct udf_inode_info *iinfo;
298
299 if (!create) {
300 phys = udf_block_map(inode, block);
301 if (phys)
302 map_bh(bh_result, inode->i_sb, phys);
303 return 0;
304 }
305
306 err = -EIO;
307 new = 0;
308 bh = NULL;
309
310 lock_kernel();
311
312 iinfo = UDF_I(inode);
313 if (block == iinfo->i_next_alloc_block + 1) {
314 iinfo->i_next_alloc_block++;
315 iinfo->i_next_alloc_goal++;
316 }
317
318 err = 0;
319
320 bh = inode_getblk(inode, block, &err, &phys, &new);
321 BUG_ON(bh);
322 if (err)
323 goto abort;
324 BUG_ON(!phys);
325
326 if (new)
327 set_buffer_new(bh_result);
328 map_bh(bh_result, inode->i_sb, phys);
329
330 abort:
331 unlock_kernel();
332 return err;
333 }
334
335 static struct buffer_head *udf_getblk(struct inode *inode, long block,
336 int create, int *err)
337 {
338 struct buffer_head *bh;
339 struct buffer_head dummy;
340
341 dummy.b_state = 0;
342 dummy.b_blocknr = -1000;
343 *err = udf_get_block(inode, block, &dummy, create);
344 if (!*err && buffer_mapped(&dummy)) {
345 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
346 if (buffer_new(&dummy)) {
347 lock_buffer(bh);
348 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
349 set_buffer_uptodate(bh);
350 unlock_buffer(bh);
351 mark_buffer_dirty_inode(bh, inode);
352 }
353 return bh;
354 }
355
356 return NULL;
357 }
358
359 /* Extend the file by 'blocks' blocks, return the number of extents added */
360 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
361 struct kernel_long_ad *last_ext, sector_t blocks)
362 {
363 sector_t add;
364 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
365 struct super_block *sb = inode->i_sb;
366 struct kernel_lb_addr prealloc_loc = {};
367 int prealloc_len = 0;
368 struct udf_inode_info *iinfo;
369
370 /* The previous extent is fake and we should not extend by anything
371 * - there's nothing to do... */
372 if (!blocks && fake)
373 return 0;
374
375 iinfo = UDF_I(inode);
376 /* Round the last extent up to a multiple of block size */
377 if (last_ext->extLength & (sb->s_blocksize - 1)) {
378 last_ext->extLength =
379 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
380 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
381 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
382 iinfo->i_lenExtents =
383 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
384 ~(sb->s_blocksize - 1);
385 }
386
387 /* Last extent are just preallocated blocks? */
388 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
389 EXT_NOT_RECORDED_ALLOCATED) {
390 /* Save the extent so that we can reattach it to the end */
391 prealloc_loc = last_ext->extLocation;
392 prealloc_len = last_ext->extLength;
393 /* Mark the extent as a hole */
394 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
395 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
396 last_ext->extLocation.logicalBlockNum = 0;
397 last_ext->extLocation.partitionReferenceNum = 0;
398 }
399
400 /* Can we merge with the previous extent? */
401 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
402 EXT_NOT_RECORDED_NOT_ALLOCATED) {
403 add = ((1 << 30) - sb->s_blocksize -
404 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
405 sb->s_blocksize_bits;
406 if (add > blocks)
407 add = blocks;
408 blocks -= add;
409 last_ext->extLength += add << sb->s_blocksize_bits;
410 }
411
412 if (fake) {
413 udf_add_aext(inode, last_pos, &last_ext->extLocation,
414 last_ext->extLength, 1);
415 count++;
416 } else
417 udf_write_aext(inode, last_pos, &last_ext->extLocation,
418 last_ext->extLength, 1);
419
420 /* Managed to do everything necessary? */
421 if (!blocks)
422 goto out;
423
424 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
425 last_ext->extLocation.logicalBlockNum = 0;
426 last_ext->extLocation.partitionReferenceNum = 0;
427 add = (1 << (30-sb->s_blocksize_bits)) - 1;
428 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
429 (add << sb->s_blocksize_bits);
430
431 /* Create enough extents to cover the whole hole */
432 while (blocks > add) {
433 blocks -= add;
434 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
435 last_ext->extLength, 1) == -1)
436 return -1;
437 count++;
438 }
439 if (blocks) {
440 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
441 (blocks << sb->s_blocksize_bits);
442 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
443 last_ext->extLength, 1) == -1)
444 return -1;
445 count++;
446 }
447
448 out:
449 /* Do we have some preallocated blocks saved? */
450 if (prealloc_len) {
451 if (udf_add_aext(inode, last_pos, &prealloc_loc,
452 prealloc_len, 1) == -1)
453 return -1;
454 last_ext->extLocation = prealloc_loc;
455 last_ext->extLength = prealloc_len;
456 count++;
457 }
458
459 /* last_pos should point to the last written extent... */
460 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
461 last_pos->offset -= sizeof(struct short_ad);
462 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
463 last_pos->offset -= sizeof(struct long_ad);
464 else
465 return -1;
466
467 return count;
468 }
469
470 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
471 int *err, sector_t *phys, int *new)
472 {
473 static sector_t last_block;
474 struct buffer_head *result = NULL;
475 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
476 struct extent_position prev_epos, cur_epos, next_epos;
477 int count = 0, startnum = 0, endnum = 0;
478 uint32_t elen = 0, tmpelen;
479 struct kernel_lb_addr eloc, tmpeloc;
480 int c = 1;
481 loff_t lbcount = 0, b_off = 0;
482 uint32_t newblocknum, newblock;
483 sector_t offset = 0;
484 int8_t etype;
485 struct udf_inode_info *iinfo = UDF_I(inode);
486 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
487 int lastblock = 0;
488
489 prev_epos.offset = udf_file_entry_alloc_offset(inode);
490 prev_epos.block = iinfo->i_location;
491 prev_epos.bh = NULL;
492 cur_epos = next_epos = prev_epos;
493 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
494
495 /* find the extent which contains the block we are looking for.
496 alternate between laarr[0] and laarr[1] for locations of the
497 current extent, and the previous extent */
498 do {
499 if (prev_epos.bh != cur_epos.bh) {
500 brelse(prev_epos.bh);
501 get_bh(cur_epos.bh);
502 prev_epos.bh = cur_epos.bh;
503 }
504 if (cur_epos.bh != next_epos.bh) {
505 brelse(cur_epos.bh);
506 get_bh(next_epos.bh);
507 cur_epos.bh = next_epos.bh;
508 }
509
510 lbcount += elen;
511
512 prev_epos.block = cur_epos.block;
513 cur_epos.block = next_epos.block;
514
515 prev_epos.offset = cur_epos.offset;
516 cur_epos.offset = next_epos.offset;
517
518 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
519 if (etype == -1)
520 break;
521
522 c = !c;
523
524 laarr[c].extLength = (etype << 30) | elen;
525 laarr[c].extLocation = eloc;
526
527 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
528 pgoal = eloc.logicalBlockNum +
529 ((elen + inode->i_sb->s_blocksize - 1) >>
530 inode->i_sb->s_blocksize_bits);
531
532 count++;
533 } while (lbcount + elen <= b_off);
534
535 b_off -= lbcount;
536 offset = b_off >> inode->i_sb->s_blocksize_bits;
537 /*
538 * Move prev_epos and cur_epos into indirect extent if we are at
539 * the pointer to it
540 */
541 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
542 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
543
544 /* if the extent is allocated and recorded, return the block
545 if the extent is not a multiple of the blocksize, round up */
546
547 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
548 if (elen & (inode->i_sb->s_blocksize - 1)) {
549 elen = EXT_RECORDED_ALLOCATED |
550 ((elen + inode->i_sb->s_blocksize - 1) &
551 ~(inode->i_sb->s_blocksize - 1));
552 etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
553 }
554 brelse(prev_epos.bh);
555 brelse(cur_epos.bh);
556 brelse(next_epos.bh);
557 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
558 *phys = newblock;
559 return NULL;
560 }
561
562 last_block = block;
563 /* Are we beyond EOF? */
564 if (etype == -1) {
565 int ret;
566
567 if (count) {
568 if (c)
569 laarr[0] = laarr[1];
570 startnum = 1;
571 } else {
572 /* Create a fake extent when there's not one */
573 memset(&laarr[0].extLocation, 0x00,
574 sizeof(struct kernel_lb_addr));
575 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
576 /* Will udf_extend_file() create real extent from
577 a fake one? */
578 startnum = (offset > 0);
579 }
580 /* Create extents for the hole between EOF and offset */
581 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
582 if (ret == -1) {
583 brelse(prev_epos.bh);
584 brelse(cur_epos.bh);
585 brelse(next_epos.bh);
586 /* We don't really know the error here so we just make
587 * something up */
588 *err = -ENOSPC;
589 return NULL;
590 }
591 c = 0;
592 offset = 0;
593 count += ret;
594 /* We are not covered by a preallocated extent? */
595 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
596 EXT_NOT_RECORDED_ALLOCATED) {
597 /* Is there any real extent? - otherwise we overwrite
598 * the fake one... */
599 if (count)
600 c = !c;
601 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
602 inode->i_sb->s_blocksize;
603 memset(&laarr[c].extLocation, 0x00,
604 sizeof(struct kernel_lb_addr));
605 count++;
606 endnum++;
607 }
608 endnum = c + 1;
609 lastblock = 1;
610 } else {
611 endnum = startnum = ((count > 2) ? 2 : count);
612
613 /* if the current extent is in position 0,
614 swap it with the previous */
615 if (!c && count != 1) {
616 laarr[2] = laarr[0];
617 laarr[0] = laarr[1];
618 laarr[1] = laarr[2];
619 c = 1;
620 }
621
622 /* if the current block is located in an extent,
623 read the next extent */
624 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
625 if (etype != -1) {
626 laarr[c + 1].extLength = (etype << 30) | elen;
627 laarr[c + 1].extLocation = eloc;
628 count++;
629 startnum++;
630 endnum++;
631 } else
632 lastblock = 1;
633 }
634
635 /* if the current extent is not recorded but allocated, get the
636 * block in the extent corresponding to the requested block */
637 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
638 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
639 else { /* otherwise, allocate a new block */
640 if (iinfo->i_next_alloc_block == block)
641 goal = iinfo->i_next_alloc_goal;
642
643 if (!goal) {
644 if (!(goal = pgoal)) /* XXX: what was intended here? */
645 goal = iinfo->i_location.logicalBlockNum + 1;
646 }
647
648 newblocknum = udf_new_block(inode->i_sb, inode,
649 iinfo->i_location.partitionReferenceNum,
650 goal, err);
651 if (!newblocknum) {
652 brelse(prev_epos.bh);
653 *err = -ENOSPC;
654 return NULL;
655 }
656 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
657 }
658
659 /* if the extent the requsted block is located in contains multiple
660 * blocks, split the extent into at most three extents. blocks prior
661 * to requested block, requested block, and blocks after requested
662 * block */
663 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
664
665 #ifdef UDF_PREALLOCATE
666 /* We preallocate blocks only for regular files. It also makes sense
667 * for directories but there's a problem when to drop the
668 * preallocation. We might use some delayed work for that but I feel
669 * it's overengineering for a filesystem like UDF. */
670 if (S_ISREG(inode->i_mode))
671 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
672 #endif
673
674 /* merge any continuous blocks in laarr */
675 udf_merge_extents(inode, laarr, &endnum);
676
677 /* write back the new extents, inserting new extents if the new number
678 * of extents is greater than the old number, and deleting extents if
679 * the new number of extents is less than the old number */
680 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
681
682 brelse(prev_epos.bh);
683
684 newblock = udf_get_pblock(inode->i_sb, newblocknum,
685 iinfo->i_location.partitionReferenceNum, 0);
686 if (!newblock)
687 return NULL;
688 *phys = newblock;
689 *err = 0;
690 *new = 1;
691 iinfo->i_next_alloc_block = block;
692 iinfo->i_next_alloc_goal = newblocknum;
693 inode->i_ctime = current_fs_time(inode->i_sb);
694
695 if (IS_SYNC(inode))
696 udf_sync_inode(inode);
697 else
698 mark_inode_dirty(inode);
699
700 return result;
701 }
702
703 static void udf_split_extents(struct inode *inode, int *c, int offset,
704 int newblocknum,
705 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
706 int *endnum)
707 {
708 unsigned long blocksize = inode->i_sb->s_blocksize;
709 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
710
711 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
712 (laarr[*c].extLength >> 30) ==
713 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
714 int curr = *c;
715 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
716 blocksize - 1) >> blocksize_bits;
717 int8_t etype = (laarr[curr].extLength >> 30);
718
719 if (blen == 1)
720 ;
721 else if (!offset || blen == offset + 1) {
722 laarr[curr + 2] = laarr[curr + 1];
723 laarr[curr + 1] = laarr[curr];
724 } else {
725 laarr[curr + 3] = laarr[curr + 1];
726 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
727 }
728
729 if (offset) {
730 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
731 udf_free_blocks(inode->i_sb, inode,
732 &laarr[curr].extLocation,
733 0, offset);
734 laarr[curr].extLength =
735 EXT_NOT_RECORDED_NOT_ALLOCATED |
736 (offset << blocksize_bits);
737 laarr[curr].extLocation.logicalBlockNum = 0;
738 laarr[curr].extLocation.
739 partitionReferenceNum = 0;
740 } else
741 laarr[curr].extLength = (etype << 30) |
742 (offset << blocksize_bits);
743 curr++;
744 (*c)++;
745 (*endnum)++;
746 }
747
748 laarr[curr].extLocation.logicalBlockNum = newblocknum;
749 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
750 laarr[curr].extLocation.partitionReferenceNum =
751 UDF_I(inode)->i_location.partitionReferenceNum;
752 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
753 blocksize;
754 curr++;
755
756 if (blen != offset + 1) {
757 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
758 laarr[curr].extLocation.logicalBlockNum +=
759 offset + 1;
760 laarr[curr].extLength = (etype << 30) |
761 ((blen - (offset + 1)) << blocksize_bits);
762 curr++;
763 (*endnum)++;
764 }
765 }
766 }
767
768 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
769 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
770 int *endnum)
771 {
772 int start, length = 0, currlength = 0, i;
773
774 if (*endnum >= (c + 1)) {
775 if (!lastblock)
776 return;
777 else
778 start = c;
779 } else {
780 if ((laarr[c + 1].extLength >> 30) ==
781 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
782 start = c + 1;
783 length = currlength =
784 (((laarr[c + 1].extLength &
785 UDF_EXTENT_LENGTH_MASK) +
786 inode->i_sb->s_blocksize - 1) >>
787 inode->i_sb->s_blocksize_bits);
788 } else
789 start = c;
790 }
791
792 for (i = start + 1; i <= *endnum; i++) {
793 if (i == *endnum) {
794 if (lastblock)
795 length += UDF_DEFAULT_PREALLOC_BLOCKS;
796 } else if ((laarr[i].extLength >> 30) ==
797 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
798 length += (((laarr[i].extLength &
799 UDF_EXTENT_LENGTH_MASK) +
800 inode->i_sb->s_blocksize - 1) >>
801 inode->i_sb->s_blocksize_bits);
802 } else
803 break;
804 }
805
806 if (length) {
807 int next = laarr[start].extLocation.logicalBlockNum +
808 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
809 inode->i_sb->s_blocksize - 1) >>
810 inode->i_sb->s_blocksize_bits);
811 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
812 laarr[start].extLocation.partitionReferenceNum,
813 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
814 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
815 currlength);
816 if (numalloc) {
817 if (start == (c + 1))
818 laarr[start].extLength +=
819 (numalloc <<
820 inode->i_sb->s_blocksize_bits);
821 else {
822 memmove(&laarr[c + 2], &laarr[c + 1],
823 sizeof(struct long_ad) * (*endnum - (c + 1)));
824 (*endnum)++;
825 laarr[c + 1].extLocation.logicalBlockNum = next;
826 laarr[c + 1].extLocation.partitionReferenceNum =
827 laarr[c].extLocation.
828 partitionReferenceNum;
829 laarr[c + 1].extLength =
830 EXT_NOT_RECORDED_ALLOCATED |
831 (numalloc <<
832 inode->i_sb->s_blocksize_bits);
833 start = c + 1;
834 }
835
836 for (i = start + 1; numalloc && i < *endnum; i++) {
837 int elen = ((laarr[i].extLength &
838 UDF_EXTENT_LENGTH_MASK) +
839 inode->i_sb->s_blocksize - 1) >>
840 inode->i_sb->s_blocksize_bits;
841
842 if (elen > numalloc) {
843 laarr[i].extLength -=
844 (numalloc <<
845 inode->i_sb->s_blocksize_bits);
846 numalloc = 0;
847 } else {
848 numalloc -= elen;
849 if (*endnum > (i + 1))
850 memmove(&laarr[i],
851 &laarr[i + 1],
852 sizeof(struct long_ad) *
853 (*endnum - (i + 1)));
854 i--;
855 (*endnum)--;
856 }
857 }
858 UDF_I(inode)->i_lenExtents +=
859 numalloc << inode->i_sb->s_blocksize_bits;
860 }
861 }
862 }
863
864 static void udf_merge_extents(struct inode *inode,
865 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
866 int *endnum)
867 {
868 int i;
869 unsigned long blocksize = inode->i_sb->s_blocksize;
870 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
871
872 for (i = 0; i < (*endnum - 1); i++) {
873 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
874 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
875
876 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
877 (((li->extLength >> 30) ==
878 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
879 ((lip1->extLocation.logicalBlockNum -
880 li->extLocation.logicalBlockNum) ==
881 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
882 blocksize - 1) >> blocksize_bits)))) {
883
884 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
885 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
886 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
887 lip1->extLength = (lip1->extLength -
888 (li->extLength &
889 UDF_EXTENT_LENGTH_MASK) +
890 UDF_EXTENT_LENGTH_MASK) &
891 ~(blocksize - 1);
892 li->extLength = (li->extLength &
893 UDF_EXTENT_FLAG_MASK) +
894 (UDF_EXTENT_LENGTH_MASK + 1) -
895 blocksize;
896 lip1->extLocation.logicalBlockNum =
897 li->extLocation.logicalBlockNum +
898 ((li->extLength &
899 UDF_EXTENT_LENGTH_MASK) >>
900 blocksize_bits);
901 } else {
902 li->extLength = lip1->extLength +
903 (((li->extLength &
904 UDF_EXTENT_LENGTH_MASK) +
905 blocksize - 1) & ~(blocksize - 1));
906 if (*endnum > (i + 2))
907 memmove(&laarr[i + 1], &laarr[i + 2],
908 sizeof(struct long_ad) *
909 (*endnum - (i + 2)));
910 i--;
911 (*endnum)--;
912 }
913 } else if (((li->extLength >> 30) ==
914 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
915 ((lip1->extLength >> 30) ==
916 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
917 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
918 ((li->extLength &
919 UDF_EXTENT_LENGTH_MASK) +
920 blocksize - 1) >> blocksize_bits);
921 li->extLocation.logicalBlockNum = 0;
922 li->extLocation.partitionReferenceNum = 0;
923
924 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
925 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
926 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
927 lip1->extLength = (lip1->extLength -
928 (li->extLength &
929 UDF_EXTENT_LENGTH_MASK) +
930 UDF_EXTENT_LENGTH_MASK) &
931 ~(blocksize - 1);
932 li->extLength = (li->extLength &
933 UDF_EXTENT_FLAG_MASK) +
934 (UDF_EXTENT_LENGTH_MASK + 1) -
935 blocksize;
936 } else {
937 li->extLength = lip1->extLength +
938 (((li->extLength &
939 UDF_EXTENT_LENGTH_MASK) +
940 blocksize - 1) & ~(blocksize - 1));
941 if (*endnum > (i + 2))
942 memmove(&laarr[i + 1], &laarr[i + 2],
943 sizeof(struct long_ad) *
944 (*endnum - (i + 2)));
945 i--;
946 (*endnum)--;
947 }
948 } else if ((li->extLength >> 30) ==
949 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
950 udf_free_blocks(inode->i_sb, inode,
951 &li->extLocation, 0,
952 ((li->extLength &
953 UDF_EXTENT_LENGTH_MASK) +
954 blocksize - 1) >> blocksize_bits);
955 li->extLocation.logicalBlockNum = 0;
956 li->extLocation.partitionReferenceNum = 0;
957 li->extLength = (li->extLength &
958 UDF_EXTENT_LENGTH_MASK) |
959 EXT_NOT_RECORDED_NOT_ALLOCATED;
960 }
961 }
962 }
963
964 static void udf_update_extents(struct inode *inode,
965 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
966 int startnum, int endnum,
967 struct extent_position *epos)
968 {
969 int start = 0, i;
970 struct kernel_lb_addr tmploc;
971 uint32_t tmplen;
972
973 if (startnum > endnum) {
974 for (i = 0; i < (startnum - endnum); i++)
975 udf_delete_aext(inode, *epos, laarr[i].extLocation,
976 laarr[i].extLength);
977 } else if (startnum < endnum) {
978 for (i = 0; i < (endnum - startnum); i++) {
979 udf_insert_aext(inode, *epos, laarr[i].extLocation,
980 laarr[i].extLength);
981 udf_next_aext(inode, epos, &laarr[i].extLocation,
982 &laarr[i].extLength, 1);
983 start++;
984 }
985 }
986
987 for (i = start; i < endnum; i++) {
988 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
989 udf_write_aext(inode, epos, &laarr[i].extLocation,
990 laarr[i].extLength, 1);
991 }
992 }
993
994 struct buffer_head *udf_bread(struct inode *inode, int block,
995 int create, int *err)
996 {
997 struct buffer_head *bh = NULL;
998
999 bh = udf_getblk(inode, block, create, err);
1000 if (!bh)
1001 return NULL;
1002
1003 if (buffer_uptodate(bh))
1004 return bh;
1005
1006 ll_rw_block(READ, 1, &bh);
1007
1008 wait_on_buffer(bh);
1009 if (buffer_uptodate(bh))
1010 return bh;
1011
1012 brelse(bh);
1013 *err = -EIO;
1014 return NULL;
1015 }
1016
1017 void udf_truncate(struct inode *inode)
1018 {
1019 int offset;
1020 int err;
1021 struct udf_inode_info *iinfo;
1022
1023 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1024 S_ISLNK(inode->i_mode)))
1025 return;
1026 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1027 return;
1028
1029 lock_kernel();
1030 iinfo = UDF_I(inode);
1031 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1032 if (inode->i_sb->s_blocksize <
1033 (udf_file_entry_alloc_offset(inode) +
1034 inode->i_size)) {
1035 udf_expand_file_adinicb(inode, inode->i_size, &err);
1036 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1037 inode->i_size = iinfo->i_lenAlloc;
1038 unlock_kernel();
1039 return;
1040 } else
1041 udf_truncate_extents(inode);
1042 } else {
1043 offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1044 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1045 0x00, inode->i_sb->s_blocksize -
1046 offset - udf_file_entry_alloc_offset(inode));
1047 iinfo->i_lenAlloc = inode->i_size;
1048 }
1049 } else {
1050 block_truncate_page(inode->i_mapping, inode->i_size,
1051 udf_get_block);
1052 udf_truncate_extents(inode);
1053 }
1054
1055 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1056 if (IS_SYNC(inode))
1057 udf_sync_inode(inode);
1058 else
1059 mark_inode_dirty(inode);
1060 unlock_kernel();
1061 }
1062
1063 static void __udf_read_inode(struct inode *inode)
1064 {
1065 struct buffer_head *bh = NULL;
1066 struct fileEntry *fe;
1067 uint16_t ident;
1068 struct udf_inode_info *iinfo = UDF_I(inode);
1069
1070 /*
1071 * Set defaults, but the inode is still incomplete!
1072 * Note: get_new_inode() sets the following on a new inode:
1073 * i_sb = sb
1074 * i_no = ino
1075 * i_flags = sb->s_flags
1076 * i_state = 0
1077 * clean_inode(): zero fills and sets
1078 * i_count = 1
1079 * i_nlink = 1
1080 * i_op = NULL;
1081 */
1082 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1083 if (!bh) {
1084 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1085 inode->i_ino);
1086 make_bad_inode(inode);
1087 return;
1088 }
1089
1090 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1091 ident != TAG_IDENT_USE) {
1092 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1093 "failed ident=%d\n", inode->i_ino, ident);
1094 brelse(bh);
1095 make_bad_inode(inode);
1096 return;
1097 }
1098
1099 fe = (struct fileEntry *)bh->b_data;
1100
1101 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1102 struct buffer_head *ibh;
1103
1104 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1105 &ident);
1106 if (ident == TAG_IDENT_IE && ibh) {
1107 struct buffer_head *nbh = NULL;
1108 struct kernel_lb_addr loc;
1109 struct indirectEntry *ie;
1110
1111 ie = (struct indirectEntry *)ibh->b_data;
1112 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1113
1114 if (ie->indirectICB.extLength &&
1115 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1116 &ident))) {
1117 if (ident == TAG_IDENT_FE ||
1118 ident == TAG_IDENT_EFE) {
1119 memcpy(&iinfo->i_location,
1120 &loc,
1121 sizeof(struct kernel_lb_addr));
1122 brelse(bh);
1123 brelse(ibh);
1124 brelse(nbh);
1125 __udf_read_inode(inode);
1126 return;
1127 }
1128 brelse(nbh);
1129 }
1130 }
1131 brelse(ibh);
1132 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1133 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1134 le16_to_cpu(fe->icbTag.strategyType));
1135 brelse(bh);
1136 make_bad_inode(inode);
1137 return;
1138 }
1139 udf_fill_inode(inode, bh);
1140
1141 brelse(bh);
1142 }
1143
1144 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1145 {
1146 struct fileEntry *fe;
1147 struct extendedFileEntry *efe;
1148 int offset;
1149 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1150 struct udf_inode_info *iinfo = UDF_I(inode);
1151
1152 fe = (struct fileEntry *)bh->b_data;
1153 efe = (struct extendedFileEntry *)bh->b_data;
1154
1155 if (fe->icbTag.strategyType == cpu_to_le16(4))
1156 iinfo->i_strat4096 = 0;
1157 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1158 iinfo->i_strat4096 = 1;
1159
1160 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1161 ICBTAG_FLAG_AD_MASK;
1162 iinfo->i_unique = 0;
1163 iinfo->i_lenEAttr = 0;
1164 iinfo->i_lenExtents = 0;
1165 iinfo->i_lenAlloc = 0;
1166 iinfo->i_next_alloc_block = 0;
1167 iinfo->i_next_alloc_goal = 0;
1168 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1169 iinfo->i_efe = 1;
1170 iinfo->i_use = 0;
1171 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1172 sizeof(struct extendedFileEntry))) {
1173 make_bad_inode(inode);
1174 return;
1175 }
1176 memcpy(iinfo->i_ext.i_data,
1177 bh->b_data + sizeof(struct extendedFileEntry),
1178 inode->i_sb->s_blocksize -
1179 sizeof(struct extendedFileEntry));
1180 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1181 iinfo->i_efe = 0;
1182 iinfo->i_use = 0;
1183 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1184 sizeof(struct fileEntry))) {
1185 make_bad_inode(inode);
1186 return;
1187 }
1188 memcpy(iinfo->i_ext.i_data,
1189 bh->b_data + sizeof(struct fileEntry),
1190 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1191 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1192 iinfo->i_efe = 0;
1193 iinfo->i_use = 1;
1194 iinfo->i_lenAlloc = le32_to_cpu(
1195 ((struct unallocSpaceEntry *)bh->b_data)->
1196 lengthAllocDescs);
1197 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1198 sizeof(struct unallocSpaceEntry))) {
1199 make_bad_inode(inode);
1200 return;
1201 }
1202 memcpy(iinfo->i_ext.i_data,
1203 bh->b_data + sizeof(struct unallocSpaceEntry),
1204 inode->i_sb->s_blocksize -
1205 sizeof(struct unallocSpaceEntry));
1206 return;
1207 }
1208
1209 inode->i_uid = le32_to_cpu(fe->uid);
1210 if (inode->i_uid == -1 ||
1211 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1212 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1213 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1214
1215 inode->i_gid = le32_to_cpu(fe->gid);
1216 if (inode->i_gid == -1 ||
1217 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1218 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1219 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1220
1221 inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1222 if (!inode->i_nlink)
1223 inode->i_nlink = 1;
1224
1225 inode->i_size = le64_to_cpu(fe->informationLength);
1226 iinfo->i_lenExtents = inode->i_size;
1227
1228 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1229 sbi->s_fmode != UDF_INVALID_MODE)
1230 inode->i_mode = sbi->s_fmode;
1231 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1232 sbi->s_dmode != UDF_INVALID_MODE)
1233 inode->i_mode = sbi->s_dmode;
1234 else
1235 inode->i_mode = udf_convert_permissions(fe);
1236 inode->i_mode &= ~sbi->s_umask;
1237
1238 if (iinfo->i_efe == 0) {
1239 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1240 (inode->i_sb->s_blocksize_bits - 9);
1241
1242 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1243 inode->i_atime = sbi->s_record_time;
1244
1245 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1246 fe->modificationTime))
1247 inode->i_mtime = sbi->s_record_time;
1248
1249 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1250 inode->i_ctime = sbi->s_record_time;
1251
1252 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1253 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1254 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1255 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1256 } else {
1257 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1258 (inode->i_sb->s_blocksize_bits - 9);
1259
1260 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1261 inode->i_atime = sbi->s_record_time;
1262
1263 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1264 efe->modificationTime))
1265 inode->i_mtime = sbi->s_record_time;
1266
1267 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1268 iinfo->i_crtime = sbi->s_record_time;
1269
1270 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1271 inode->i_ctime = sbi->s_record_time;
1272
1273 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1274 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1275 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1276 offset = sizeof(struct extendedFileEntry) +
1277 iinfo->i_lenEAttr;
1278 }
1279
1280 switch (fe->icbTag.fileType) {
1281 case ICBTAG_FILE_TYPE_DIRECTORY:
1282 inode->i_op = &udf_dir_inode_operations;
1283 inode->i_fop = &udf_dir_operations;
1284 inode->i_mode |= S_IFDIR;
1285 inc_nlink(inode);
1286 break;
1287 case ICBTAG_FILE_TYPE_REALTIME:
1288 case ICBTAG_FILE_TYPE_REGULAR:
1289 case ICBTAG_FILE_TYPE_UNDEF:
1290 case ICBTAG_FILE_TYPE_VAT20:
1291 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1292 inode->i_data.a_ops = &udf_adinicb_aops;
1293 else
1294 inode->i_data.a_ops = &udf_aops;
1295 inode->i_op = &udf_file_inode_operations;
1296 inode->i_fop = &udf_file_operations;
1297 inode->i_mode |= S_IFREG;
1298 break;
1299 case ICBTAG_FILE_TYPE_BLOCK:
1300 inode->i_mode |= S_IFBLK;
1301 break;
1302 case ICBTAG_FILE_TYPE_CHAR:
1303 inode->i_mode |= S_IFCHR;
1304 break;
1305 case ICBTAG_FILE_TYPE_FIFO:
1306 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1307 break;
1308 case ICBTAG_FILE_TYPE_SOCKET:
1309 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1310 break;
1311 case ICBTAG_FILE_TYPE_SYMLINK:
1312 inode->i_data.a_ops = &udf_symlink_aops;
1313 inode->i_op = &page_symlink_inode_operations;
1314 inode->i_mode = S_IFLNK | S_IRWXUGO;
1315 break;
1316 case ICBTAG_FILE_TYPE_MAIN:
1317 udf_debug("METADATA FILE-----\n");
1318 break;
1319 case ICBTAG_FILE_TYPE_MIRROR:
1320 udf_debug("METADATA MIRROR FILE-----\n");
1321 break;
1322 case ICBTAG_FILE_TYPE_BITMAP:
1323 udf_debug("METADATA BITMAP FILE-----\n");
1324 break;
1325 default:
1326 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1327 "file type=%d\n", inode->i_ino,
1328 fe->icbTag.fileType);
1329 make_bad_inode(inode);
1330 return;
1331 }
1332 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1333 struct deviceSpec *dsea =
1334 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1335 if (dsea) {
1336 init_special_inode(inode, inode->i_mode,
1337 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1338 le32_to_cpu(dsea->minorDeviceIdent)));
1339 /* Developer ID ??? */
1340 } else
1341 make_bad_inode(inode);
1342 }
1343 }
1344
1345 static int udf_alloc_i_data(struct inode *inode, size_t size)
1346 {
1347 struct udf_inode_info *iinfo = UDF_I(inode);
1348 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1349
1350 if (!iinfo->i_ext.i_data) {
1351 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1352 "no free memory\n", inode->i_ino);
1353 return -ENOMEM;
1354 }
1355
1356 return 0;
1357 }
1358
1359 static mode_t udf_convert_permissions(struct fileEntry *fe)
1360 {
1361 mode_t mode;
1362 uint32_t permissions;
1363 uint32_t flags;
1364
1365 permissions = le32_to_cpu(fe->permissions);
1366 flags = le16_to_cpu(fe->icbTag.flags);
1367
1368 mode = ((permissions) & S_IRWXO) |
1369 ((permissions >> 2) & S_IRWXG) |
1370 ((permissions >> 4) & S_IRWXU) |
1371 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1372 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1373 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1374
1375 return mode;
1376 }
1377
1378 int udf_write_inode(struct inode *inode, int sync)
1379 {
1380 int ret;
1381
1382 lock_kernel();
1383 ret = udf_update_inode(inode, sync);
1384 unlock_kernel();
1385
1386 return ret;
1387 }
1388
1389 int udf_sync_inode(struct inode *inode)
1390 {
1391 return udf_update_inode(inode, 1);
1392 }
1393
1394 static int udf_update_inode(struct inode *inode, int do_sync)
1395 {
1396 struct buffer_head *bh = NULL;
1397 struct fileEntry *fe;
1398 struct extendedFileEntry *efe;
1399 uint32_t udfperms;
1400 uint16_t icbflags;
1401 uint16_t crclen;
1402 int err = 0;
1403 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1404 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1405 struct udf_inode_info *iinfo = UDF_I(inode);
1406
1407 bh = udf_tread(inode->i_sb,
1408 udf_get_lb_pblock(inode->i_sb,
1409 &iinfo->i_location, 0));
1410 if (!bh) {
1411 udf_debug("bread failure\n");
1412 return -EIO;
1413 }
1414
1415 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1416
1417 fe = (struct fileEntry *)bh->b_data;
1418 efe = (struct extendedFileEntry *)bh->b_data;
1419
1420 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1421 struct unallocSpaceEntry *use =
1422 (struct unallocSpaceEntry *)bh->b_data;
1423
1424 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1425 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1426 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1427 sizeof(struct unallocSpaceEntry));
1428 crclen = sizeof(struct unallocSpaceEntry) +
1429 iinfo->i_lenAlloc - sizeof(struct tag);
1430 use->descTag.tagLocation = cpu_to_le32(
1431 iinfo->i_location.
1432 logicalBlockNum);
1433 use->descTag.descCRCLength = cpu_to_le16(crclen);
1434 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1435 sizeof(struct tag),
1436 crclen));
1437 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1438
1439 mark_buffer_dirty(bh);
1440 brelse(bh);
1441 return err;
1442 }
1443
1444 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1445 fe->uid = cpu_to_le32(-1);
1446 else
1447 fe->uid = cpu_to_le32(inode->i_uid);
1448
1449 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1450 fe->gid = cpu_to_le32(-1);
1451 else
1452 fe->gid = cpu_to_le32(inode->i_gid);
1453
1454 udfperms = ((inode->i_mode & S_IRWXO)) |
1455 ((inode->i_mode & S_IRWXG) << 2) |
1456 ((inode->i_mode & S_IRWXU) << 4);
1457
1458 udfperms |= (le32_to_cpu(fe->permissions) &
1459 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1460 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1461 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1462 fe->permissions = cpu_to_le32(udfperms);
1463
1464 if (S_ISDIR(inode->i_mode))
1465 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1466 else
1467 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1468
1469 fe->informationLength = cpu_to_le64(inode->i_size);
1470
1471 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1472 struct regid *eid;
1473 struct deviceSpec *dsea =
1474 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1475 if (!dsea) {
1476 dsea = (struct deviceSpec *)
1477 udf_add_extendedattr(inode,
1478 sizeof(struct deviceSpec) +
1479 sizeof(struct regid), 12, 0x3);
1480 dsea->attrType = cpu_to_le32(12);
1481 dsea->attrSubtype = 1;
1482 dsea->attrLength = cpu_to_le32(
1483 sizeof(struct deviceSpec) +
1484 sizeof(struct regid));
1485 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1486 }
1487 eid = (struct regid *)dsea->impUse;
1488 memset(eid, 0, sizeof(struct regid));
1489 strcpy(eid->ident, UDF_ID_DEVELOPER);
1490 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1491 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1492 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1493 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1494 }
1495
1496 if (iinfo->i_efe == 0) {
1497 memcpy(bh->b_data + sizeof(struct fileEntry),
1498 iinfo->i_ext.i_data,
1499 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1500 fe->logicalBlocksRecorded = cpu_to_le64(
1501 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1502 (blocksize_bits - 9));
1503
1504 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1505 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1506 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1507 memset(&(fe->impIdent), 0, sizeof(struct regid));
1508 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1509 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1510 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1511 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1512 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1513 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1514 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1515 crclen = sizeof(struct fileEntry);
1516 } else {
1517 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1518 iinfo->i_ext.i_data,
1519 inode->i_sb->s_blocksize -
1520 sizeof(struct extendedFileEntry));
1521 efe->objectSize = cpu_to_le64(inode->i_size);
1522 efe->logicalBlocksRecorded = cpu_to_le64(
1523 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1524 (blocksize_bits - 9));
1525
1526 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1527 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1528 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1529 iinfo->i_crtime = inode->i_atime;
1530
1531 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1532 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1533 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1534 iinfo->i_crtime = inode->i_mtime;
1535
1536 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1537 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1538 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1539 iinfo->i_crtime = inode->i_ctime;
1540
1541 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1542 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1543 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1544 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1545
1546 memset(&(efe->impIdent), 0, sizeof(struct regid));
1547 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1548 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1549 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1550 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1551 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1552 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1553 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1554 crclen = sizeof(struct extendedFileEntry);
1555 }
1556 if (iinfo->i_strat4096) {
1557 fe->icbTag.strategyType = cpu_to_le16(4096);
1558 fe->icbTag.strategyParameter = cpu_to_le16(1);
1559 fe->icbTag.numEntries = cpu_to_le16(2);
1560 } else {
1561 fe->icbTag.strategyType = cpu_to_le16(4);
1562 fe->icbTag.numEntries = cpu_to_le16(1);
1563 }
1564
1565 if (S_ISDIR(inode->i_mode))
1566 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1567 else if (S_ISREG(inode->i_mode))
1568 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1569 else if (S_ISLNK(inode->i_mode))
1570 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1571 else if (S_ISBLK(inode->i_mode))
1572 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1573 else if (S_ISCHR(inode->i_mode))
1574 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1575 else if (S_ISFIFO(inode->i_mode))
1576 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1577 else if (S_ISSOCK(inode->i_mode))
1578 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1579
1580 icbflags = iinfo->i_alloc_type |
1581 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1582 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1583 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1584 (le16_to_cpu(fe->icbTag.flags) &
1585 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1586 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1587
1588 fe->icbTag.flags = cpu_to_le16(icbflags);
1589 if (sbi->s_udfrev >= 0x0200)
1590 fe->descTag.descVersion = cpu_to_le16(3);
1591 else
1592 fe->descTag.descVersion = cpu_to_le16(2);
1593 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1594 fe->descTag.tagLocation = cpu_to_le32(
1595 iinfo->i_location.logicalBlockNum);
1596 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1597 sizeof(struct tag);
1598 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1599 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1600 crclen));
1601 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1602
1603 /* write the data blocks */
1604 mark_buffer_dirty(bh);
1605 if (do_sync) {
1606 sync_dirty_buffer(bh);
1607 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1608 printk(KERN_WARNING "IO error syncing udf inode "
1609 "[%s:%08lx]\n", inode->i_sb->s_id,
1610 inode->i_ino);
1611 err = -EIO;
1612 }
1613 }
1614 brelse(bh);
1615
1616 return err;
1617 }
1618
1619 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1620 {
1621 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1622 struct inode *inode = iget_locked(sb, block);
1623
1624 if (!inode)
1625 return NULL;
1626
1627 if (inode->i_state & I_NEW) {
1628 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1629 __udf_read_inode(inode);
1630 unlock_new_inode(inode);
1631 }
1632
1633 if (is_bad_inode(inode))
1634 goto out_iput;
1635
1636 if (ino->logicalBlockNum >= UDF_SB(sb)->
1637 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1638 udf_debug("block=%d, partition=%d out of range\n",
1639 ino->logicalBlockNum, ino->partitionReferenceNum);
1640 make_bad_inode(inode);
1641 goto out_iput;
1642 }
1643
1644 return inode;
1645
1646 out_iput:
1647 iput(inode);
1648 return NULL;
1649 }
1650
1651 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1652 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1653 {
1654 int adsize;
1655 struct short_ad *sad = NULL;
1656 struct long_ad *lad = NULL;
1657 struct allocExtDesc *aed;
1658 int8_t etype;
1659 uint8_t *ptr;
1660 struct udf_inode_info *iinfo = UDF_I(inode);
1661
1662 if (!epos->bh)
1663 ptr = iinfo->i_ext.i_data + epos->offset -
1664 udf_file_entry_alloc_offset(inode) +
1665 iinfo->i_lenEAttr;
1666 else
1667 ptr = epos->bh->b_data + epos->offset;
1668
1669 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1670 adsize = sizeof(struct short_ad);
1671 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1672 adsize = sizeof(struct long_ad);
1673 else
1674 return -1;
1675
1676 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1677 char *sptr, *dptr;
1678 struct buffer_head *nbh;
1679 int err, loffset;
1680 struct kernel_lb_addr obloc = epos->block;
1681
1682 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1683 obloc.partitionReferenceNum,
1684 obloc.logicalBlockNum, &err);
1685 if (!epos->block.logicalBlockNum)
1686 return -1;
1687 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1688 &epos->block,
1689 0));
1690 if (!nbh)
1691 return -1;
1692 lock_buffer(nbh);
1693 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1694 set_buffer_uptodate(nbh);
1695 unlock_buffer(nbh);
1696 mark_buffer_dirty_inode(nbh, inode);
1697
1698 aed = (struct allocExtDesc *)(nbh->b_data);
1699 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1700 aed->previousAllocExtLocation =
1701 cpu_to_le32(obloc.logicalBlockNum);
1702 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1703 loffset = epos->offset;
1704 aed->lengthAllocDescs = cpu_to_le32(adsize);
1705 sptr = ptr - adsize;
1706 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1707 memcpy(dptr, sptr, adsize);
1708 epos->offset = sizeof(struct allocExtDesc) + adsize;
1709 } else {
1710 loffset = epos->offset + adsize;
1711 aed->lengthAllocDescs = cpu_to_le32(0);
1712 sptr = ptr;
1713 epos->offset = sizeof(struct allocExtDesc);
1714
1715 if (epos->bh) {
1716 aed = (struct allocExtDesc *)epos->bh->b_data;
1717 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1718 } else {
1719 iinfo->i_lenAlloc += adsize;
1720 mark_inode_dirty(inode);
1721 }
1722 }
1723 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1724 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1725 epos->block.logicalBlockNum, sizeof(struct tag));
1726 else
1727 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1728 epos->block.logicalBlockNum, sizeof(struct tag));
1729 switch (iinfo->i_alloc_type) {
1730 case ICBTAG_FLAG_AD_SHORT:
1731 sad = (struct short_ad *)sptr;
1732 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1733 inode->i_sb->s_blocksize);
1734 sad->extPosition =
1735 cpu_to_le32(epos->block.logicalBlockNum);
1736 break;
1737 case ICBTAG_FLAG_AD_LONG:
1738 lad = (struct long_ad *)sptr;
1739 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1740 inode->i_sb->s_blocksize);
1741 lad->extLocation = cpu_to_lelb(epos->block);
1742 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1743 break;
1744 }
1745 if (epos->bh) {
1746 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1747 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1748 udf_update_tag(epos->bh->b_data, loffset);
1749 else
1750 udf_update_tag(epos->bh->b_data,
1751 sizeof(struct allocExtDesc));
1752 mark_buffer_dirty_inode(epos->bh, inode);
1753 brelse(epos->bh);
1754 } else {
1755 mark_inode_dirty(inode);
1756 }
1757 epos->bh = nbh;
1758 }
1759
1760 etype = udf_write_aext(inode, epos, eloc, elen, inc);
1761
1762 if (!epos->bh) {
1763 iinfo->i_lenAlloc += adsize;
1764 mark_inode_dirty(inode);
1765 } else {
1766 aed = (struct allocExtDesc *)epos->bh->b_data;
1767 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1768 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1769 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1770 udf_update_tag(epos->bh->b_data,
1771 epos->offset + (inc ? 0 : adsize));
1772 else
1773 udf_update_tag(epos->bh->b_data,
1774 sizeof(struct allocExtDesc));
1775 mark_buffer_dirty_inode(epos->bh, inode);
1776 }
1777
1778 return etype;
1779 }
1780
1781 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1782 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1783 {
1784 int adsize;
1785 uint8_t *ptr;
1786 struct short_ad *sad;
1787 struct long_ad *lad;
1788 struct udf_inode_info *iinfo = UDF_I(inode);
1789
1790 if (!epos->bh)
1791 ptr = iinfo->i_ext.i_data + epos->offset -
1792 udf_file_entry_alloc_offset(inode) +
1793 iinfo->i_lenEAttr;
1794 else
1795 ptr = epos->bh->b_data + epos->offset;
1796
1797 switch (iinfo->i_alloc_type) {
1798 case ICBTAG_FLAG_AD_SHORT:
1799 sad = (struct short_ad *)ptr;
1800 sad->extLength = cpu_to_le32(elen);
1801 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1802 adsize = sizeof(struct short_ad);
1803 break;
1804 case ICBTAG_FLAG_AD_LONG:
1805 lad = (struct long_ad *)ptr;
1806 lad->extLength = cpu_to_le32(elen);
1807 lad->extLocation = cpu_to_lelb(*eloc);
1808 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1809 adsize = sizeof(struct long_ad);
1810 break;
1811 default:
1812 return -1;
1813 }
1814
1815 if (epos->bh) {
1816 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1817 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1818 struct allocExtDesc *aed =
1819 (struct allocExtDesc *)epos->bh->b_data;
1820 udf_update_tag(epos->bh->b_data,
1821 le32_to_cpu(aed->lengthAllocDescs) +
1822 sizeof(struct allocExtDesc));
1823 }
1824 mark_buffer_dirty_inode(epos->bh, inode);
1825 } else {
1826 mark_inode_dirty(inode);
1827 }
1828
1829 if (inc)
1830 epos->offset += adsize;
1831
1832 return (elen >> 30);
1833 }
1834
1835 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1836 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1837 {
1838 int8_t etype;
1839
1840 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1841 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1842 int block;
1843 epos->block = *eloc;
1844 epos->offset = sizeof(struct allocExtDesc);
1845 brelse(epos->bh);
1846 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1847 epos->bh = udf_tread(inode->i_sb, block);
1848 if (!epos->bh) {
1849 udf_debug("reading block %d failed!\n", block);
1850 return -1;
1851 }
1852 }
1853
1854 return etype;
1855 }
1856
1857 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1858 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1859 {
1860 int alen;
1861 int8_t etype;
1862 uint8_t *ptr;
1863 struct short_ad *sad;
1864 struct long_ad *lad;
1865 struct udf_inode_info *iinfo = UDF_I(inode);
1866
1867 if (!epos->bh) {
1868 if (!epos->offset)
1869 epos->offset = udf_file_entry_alloc_offset(inode);
1870 ptr = iinfo->i_ext.i_data + epos->offset -
1871 udf_file_entry_alloc_offset(inode) +
1872 iinfo->i_lenEAttr;
1873 alen = udf_file_entry_alloc_offset(inode) +
1874 iinfo->i_lenAlloc;
1875 } else {
1876 if (!epos->offset)
1877 epos->offset = sizeof(struct allocExtDesc);
1878 ptr = epos->bh->b_data + epos->offset;
1879 alen = sizeof(struct allocExtDesc) +
1880 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1881 lengthAllocDescs);
1882 }
1883
1884 switch (iinfo->i_alloc_type) {
1885 case ICBTAG_FLAG_AD_SHORT:
1886 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1887 if (!sad)
1888 return -1;
1889 etype = le32_to_cpu(sad->extLength) >> 30;
1890 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1891 eloc->partitionReferenceNum =
1892 iinfo->i_location.partitionReferenceNum;
1893 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1894 break;
1895 case ICBTAG_FLAG_AD_LONG:
1896 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1897 if (!lad)
1898 return -1;
1899 etype = le32_to_cpu(lad->extLength) >> 30;
1900 *eloc = lelb_to_cpu(lad->extLocation);
1901 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1902 break;
1903 default:
1904 udf_debug("alloc_type = %d unsupported\n",
1905 iinfo->i_alloc_type);
1906 return -1;
1907 }
1908
1909 return etype;
1910 }
1911
1912 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1913 struct kernel_lb_addr neloc, uint32_t nelen)
1914 {
1915 struct kernel_lb_addr oeloc;
1916 uint32_t oelen;
1917 int8_t etype;
1918
1919 if (epos.bh)
1920 get_bh(epos.bh);
1921
1922 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1923 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1924 neloc = oeloc;
1925 nelen = (etype << 30) | oelen;
1926 }
1927 udf_add_aext(inode, &epos, &neloc, nelen, 1);
1928 brelse(epos.bh);
1929
1930 return (nelen >> 30);
1931 }
1932
1933 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1934 struct kernel_lb_addr eloc, uint32_t elen)
1935 {
1936 struct extent_position oepos;
1937 int adsize;
1938 int8_t etype;
1939 struct allocExtDesc *aed;
1940 struct udf_inode_info *iinfo;
1941
1942 if (epos.bh) {
1943 get_bh(epos.bh);
1944 get_bh(epos.bh);
1945 }
1946
1947 iinfo = UDF_I(inode);
1948 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1949 adsize = sizeof(struct short_ad);
1950 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1951 adsize = sizeof(struct long_ad);
1952 else
1953 adsize = 0;
1954
1955 oepos = epos;
1956 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1957 return -1;
1958
1959 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1960 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
1961 if (oepos.bh != epos.bh) {
1962 oepos.block = epos.block;
1963 brelse(oepos.bh);
1964 get_bh(epos.bh);
1965 oepos.bh = epos.bh;
1966 oepos.offset = epos.offset - adsize;
1967 }
1968 }
1969 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1970 elen = 0;
1971
1972 if (epos.bh != oepos.bh) {
1973 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
1974 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1975 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1976 if (!oepos.bh) {
1977 iinfo->i_lenAlloc -= (adsize * 2);
1978 mark_inode_dirty(inode);
1979 } else {
1980 aed = (struct allocExtDesc *)oepos.bh->b_data;
1981 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1982 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1983 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1984 udf_update_tag(oepos.bh->b_data,
1985 oepos.offset - (2 * adsize));
1986 else
1987 udf_update_tag(oepos.bh->b_data,
1988 sizeof(struct allocExtDesc));
1989 mark_buffer_dirty_inode(oepos.bh, inode);
1990 }
1991 } else {
1992 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1993 if (!oepos.bh) {
1994 iinfo->i_lenAlloc -= adsize;
1995 mark_inode_dirty(inode);
1996 } else {
1997 aed = (struct allocExtDesc *)oepos.bh->b_data;
1998 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1999 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2000 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2001 udf_update_tag(oepos.bh->b_data,
2002 epos.offset - adsize);
2003 else
2004 udf_update_tag(oepos.bh->b_data,
2005 sizeof(struct allocExtDesc));
2006 mark_buffer_dirty_inode(oepos.bh, inode);
2007 }
2008 }
2009
2010 brelse(epos.bh);
2011 brelse(oepos.bh);
2012
2013 return (elen >> 30);
2014 }
2015
2016 int8_t inode_bmap(struct inode *inode, sector_t block,
2017 struct extent_position *pos, struct kernel_lb_addr *eloc,
2018 uint32_t *elen, sector_t *offset)
2019 {
2020 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2021 loff_t lbcount = 0, bcount =
2022 (loff_t) block << blocksize_bits;
2023 int8_t etype;
2024 struct udf_inode_info *iinfo;
2025
2026 iinfo = UDF_I(inode);
2027 pos->offset = 0;
2028 pos->block = iinfo->i_location;
2029 pos->bh = NULL;
2030 *elen = 0;
2031
2032 do {
2033 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2034 if (etype == -1) {
2035 *offset = (bcount - lbcount) >> blocksize_bits;
2036 iinfo->i_lenExtents = lbcount;
2037 return -1;
2038 }
2039 lbcount += *elen;
2040 } while (lbcount <= bcount);
2041
2042 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2043
2044 return etype;
2045 }
2046
2047 long udf_block_map(struct inode *inode, sector_t block)
2048 {
2049 struct kernel_lb_addr eloc;
2050 uint32_t elen;
2051 sector_t offset;
2052 struct extent_position epos = {};
2053 int ret;
2054
2055 lock_kernel();
2056
2057 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2058 (EXT_RECORDED_ALLOCATED >> 30))
2059 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2060 else
2061 ret = 0;
2062
2063 unlock_kernel();
2064 brelse(epos.bh);
2065
2066 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2067 return udf_fixed_to_variable(ret);
2068 else
2069 return ret;
2070 }
kernel-based virtual machine