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[mirror_ubuntu-artful-kernel.git] / fs / udf / inode.c
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/module.h>
35 #include <linux/pagemap.h>
36 #include <linux/buffer_head.h>
37 #include <linux/writeback.h>
38 #include <linux/slab.h>
39 #include <linux/crc-itu-t.h>
40 #include <linux/mpage.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_sync_inode(struct inode *inode);
55 static int udf_alloc_i_data(struct inode *inode, size_t size);
56 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
57 sector_t *, int *);
58 static int8_t udf_insert_aext(struct inode *, struct extent_position,
59 struct kernel_lb_addr, uint32_t);
60 static void udf_split_extents(struct inode *, int *, int, int,
61 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
62 static void udf_prealloc_extents(struct inode *, int, int,
63 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
64 static void udf_merge_extents(struct inode *,
65 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
66 static void udf_update_extents(struct inode *,
67 struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
68 struct extent_position *);
69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
70
71
72 void udf_evict_inode(struct inode *inode)
73 {
74 struct udf_inode_info *iinfo = UDF_I(inode);
75 int want_delete = 0;
76
77 if (!inode->i_nlink && !is_bad_inode(inode)) {
78 want_delete = 1;
79 udf_setsize(inode, 0);
80 udf_update_inode(inode, IS_SYNC(inode));
81 } else
82 truncate_inode_pages(&inode->i_data, 0);
83 invalidate_inode_buffers(inode);
84 end_writeback(inode);
85 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
86 inode->i_size != iinfo->i_lenExtents) {
87 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
88 inode->i_ino, inode->i_mode,
89 (unsigned long long)inode->i_size,
90 (unsigned long long)iinfo->i_lenExtents);
91 }
92 kfree(iinfo->i_ext.i_data);
93 iinfo->i_ext.i_data = NULL;
94 if (want_delete) {
95 udf_free_inode(inode);
96 }
97 }
98
99 static int udf_writepage(struct page *page, struct writeback_control *wbc)
100 {
101 return block_write_full_page(page, udf_get_block, wbc);
102 }
103
104 static int udf_readpage(struct file *file, struct page *page)
105 {
106 return mpage_readpage(page, udf_get_block);
107 }
108
109 static int udf_readpages(struct file *file, struct address_space *mapping,
110 struct list_head *pages, unsigned nr_pages)
111 {
112 return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
113 }
114
115 static int udf_write_begin(struct file *file, struct address_space *mapping,
116 loff_t pos, unsigned len, unsigned flags,
117 struct page **pagep, void **fsdata)
118 {
119 int ret;
120
121 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
122 if (unlikely(ret)) {
123 struct inode *inode = mapping->host;
124 struct udf_inode_info *iinfo = UDF_I(inode);
125 loff_t isize = inode->i_size;
126
127 if (pos + len > isize) {
128 truncate_pagecache(inode, pos + len, isize);
129 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
130 down_write(&iinfo->i_data_sem);
131 udf_truncate_extents(inode);
132 up_write(&iinfo->i_data_sem);
133 }
134 }
135 }
136
137 return ret;
138 }
139
140 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
141 {
142 return generic_block_bmap(mapping, block, udf_get_block);
143 }
144
145 const struct address_space_operations udf_aops = {
146 .readpage = udf_readpage,
147 .readpages = udf_readpages,
148 .writepage = udf_writepage,
149 .write_begin = udf_write_begin,
150 .write_end = generic_write_end,
151 .bmap = udf_bmap,
152 };
153
154 int udf_expand_file_adinicb(struct inode *inode)
155 {
156 struct page *page;
157 char *kaddr;
158 struct udf_inode_info *iinfo = UDF_I(inode);
159 int err;
160 struct writeback_control udf_wbc = {
161 .sync_mode = WB_SYNC_NONE,
162 .nr_to_write = 1,
163 };
164
165 if (!iinfo->i_lenAlloc) {
166 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
167 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
168 else
169 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
170 /* from now on we have normal address_space methods */
171 inode->i_data.a_ops = &udf_aops;
172 mark_inode_dirty(inode);
173 return 0;
174 }
175
176 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
177 if (!page)
178 return -ENOMEM;
179
180 if (!PageUptodate(page)) {
181 kaddr = kmap(page);
182 memset(kaddr + iinfo->i_lenAlloc, 0x00,
183 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
184 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
185 iinfo->i_lenAlloc);
186 flush_dcache_page(page);
187 SetPageUptodate(page);
188 kunmap(page);
189 }
190 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
191 iinfo->i_lenAlloc);
192 iinfo->i_lenAlloc = 0;
193 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
194 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
195 else
196 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
197 /* from now on we have normal address_space methods */
198 inode->i_data.a_ops = &udf_aops;
199 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
200 if (err) {
201 /* Restore everything back so that we don't lose data... */
202 lock_page(page);
203 kaddr = kmap(page);
204 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
205 inode->i_size);
206 kunmap(page);
207 unlock_page(page);
208 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
209 inode->i_data.a_ops = &udf_adinicb_aops;
210 }
211 page_cache_release(page);
212 mark_inode_dirty(inode);
213
214 return err;
215 }
216
217 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
218 int *err)
219 {
220 int newblock;
221 struct buffer_head *dbh = NULL;
222 struct kernel_lb_addr eloc;
223 uint8_t alloctype;
224 struct extent_position epos;
225
226 struct udf_fileident_bh sfibh, dfibh;
227 loff_t f_pos = udf_ext0_offset(inode);
228 int size = udf_ext0_offset(inode) + inode->i_size;
229 struct fileIdentDesc cfi, *sfi, *dfi;
230 struct udf_inode_info *iinfo = UDF_I(inode);
231
232 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
233 alloctype = ICBTAG_FLAG_AD_SHORT;
234 else
235 alloctype = ICBTAG_FLAG_AD_LONG;
236
237 if (!inode->i_size) {
238 iinfo->i_alloc_type = alloctype;
239 mark_inode_dirty(inode);
240 return NULL;
241 }
242
243 /* alloc block, and copy data to it */
244 *block = udf_new_block(inode->i_sb, inode,
245 iinfo->i_location.partitionReferenceNum,
246 iinfo->i_location.logicalBlockNum, err);
247 if (!(*block))
248 return NULL;
249 newblock = udf_get_pblock(inode->i_sb, *block,
250 iinfo->i_location.partitionReferenceNum,
251 0);
252 if (!newblock)
253 return NULL;
254 dbh = udf_tgetblk(inode->i_sb, newblock);
255 if (!dbh)
256 return NULL;
257 lock_buffer(dbh);
258 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
259 set_buffer_uptodate(dbh);
260 unlock_buffer(dbh);
261 mark_buffer_dirty_inode(dbh, inode);
262
263 sfibh.soffset = sfibh.eoffset =
264 f_pos & (inode->i_sb->s_blocksize - 1);
265 sfibh.sbh = sfibh.ebh = NULL;
266 dfibh.soffset = dfibh.eoffset = 0;
267 dfibh.sbh = dfibh.ebh = dbh;
268 while (f_pos < size) {
269 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
270 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
271 NULL, NULL, NULL);
272 if (!sfi) {
273 brelse(dbh);
274 return NULL;
275 }
276 iinfo->i_alloc_type = alloctype;
277 sfi->descTag.tagLocation = cpu_to_le32(*block);
278 dfibh.soffset = dfibh.eoffset;
279 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
280 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
281 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
282 sfi->fileIdent +
283 le16_to_cpu(sfi->lengthOfImpUse))) {
284 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
285 brelse(dbh);
286 return NULL;
287 }
288 }
289 mark_buffer_dirty_inode(dbh, inode);
290
291 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
292 iinfo->i_lenAlloc);
293 iinfo->i_lenAlloc = 0;
294 eloc.logicalBlockNum = *block;
295 eloc.partitionReferenceNum =
296 iinfo->i_location.partitionReferenceNum;
297 iinfo->i_lenExtents = inode->i_size;
298 epos.bh = NULL;
299 epos.block = iinfo->i_location;
300 epos.offset = udf_file_entry_alloc_offset(inode);
301 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
302 /* UniqueID stuff */
303
304 brelse(epos.bh);
305 mark_inode_dirty(inode);
306 return dbh;
307 }
308
309 static int udf_get_block(struct inode *inode, sector_t block,
310 struct buffer_head *bh_result, int create)
311 {
312 int err, new;
313 struct buffer_head *bh;
314 sector_t phys = 0;
315 struct udf_inode_info *iinfo;
316
317 if (!create) {
318 phys = udf_block_map(inode, block);
319 if (phys)
320 map_bh(bh_result, inode->i_sb, phys);
321 return 0;
322 }
323
324 err = -EIO;
325 new = 0;
326 bh = NULL;
327 iinfo = UDF_I(inode);
328
329 down_write(&iinfo->i_data_sem);
330 if (block == iinfo->i_next_alloc_block + 1) {
331 iinfo->i_next_alloc_block++;
332 iinfo->i_next_alloc_goal++;
333 }
334
335 err = 0;
336
337 bh = inode_getblk(inode, block, &err, &phys, &new);
338 BUG_ON(bh);
339 if (err)
340 goto abort;
341 BUG_ON(!phys);
342
343 if (new)
344 set_buffer_new(bh_result);
345 map_bh(bh_result, inode->i_sb, phys);
346
347 abort:
348 up_write(&iinfo->i_data_sem);
349 return err;
350 }
351
352 static struct buffer_head *udf_getblk(struct inode *inode, long block,
353 int create, int *err)
354 {
355 struct buffer_head *bh;
356 struct buffer_head dummy;
357
358 dummy.b_state = 0;
359 dummy.b_blocknr = -1000;
360 *err = udf_get_block(inode, block, &dummy, create);
361 if (!*err && buffer_mapped(&dummy)) {
362 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
363 if (buffer_new(&dummy)) {
364 lock_buffer(bh);
365 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
366 set_buffer_uptodate(bh);
367 unlock_buffer(bh);
368 mark_buffer_dirty_inode(bh, inode);
369 }
370 return bh;
371 }
372
373 return NULL;
374 }
375
376 /* Extend the file by 'blocks' blocks, return the number of extents added */
377 static int udf_do_extend_file(struct inode *inode,
378 struct extent_position *last_pos,
379 struct kernel_long_ad *last_ext,
380 sector_t blocks)
381 {
382 sector_t add;
383 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
384 struct super_block *sb = inode->i_sb;
385 struct kernel_lb_addr prealloc_loc = {};
386 int prealloc_len = 0;
387 struct udf_inode_info *iinfo;
388 int err;
389
390 /* The previous extent is fake and we should not extend by anything
391 * - there's nothing to do... */
392 if (!blocks && fake)
393 return 0;
394
395 iinfo = UDF_I(inode);
396 /* Round the last extent up to a multiple of block size */
397 if (last_ext->extLength & (sb->s_blocksize - 1)) {
398 last_ext->extLength =
399 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
400 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
401 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
402 iinfo->i_lenExtents =
403 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
404 ~(sb->s_blocksize - 1);
405 }
406
407 /* Last extent are just preallocated blocks? */
408 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
409 EXT_NOT_RECORDED_ALLOCATED) {
410 /* Save the extent so that we can reattach it to the end */
411 prealloc_loc = last_ext->extLocation;
412 prealloc_len = last_ext->extLength;
413 /* Mark the extent as a hole */
414 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
415 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
416 last_ext->extLocation.logicalBlockNum = 0;
417 last_ext->extLocation.partitionReferenceNum = 0;
418 }
419
420 /* Can we merge with the previous extent? */
421 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
422 EXT_NOT_RECORDED_NOT_ALLOCATED) {
423 add = ((1 << 30) - sb->s_blocksize -
424 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
425 sb->s_blocksize_bits;
426 if (add > blocks)
427 add = blocks;
428 blocks -= add;
429 last_ext->extLength += add << sb->s_blocksize_bits;
430 }
431
432 if (fake) {
433 udf_add_aext(inode, last_pos, &last_ext->extLocation,
434 last_ext->extLength, 1);
435 count++;
436 } else
437 udf_write_aext(inode, last_pos, &last_ext->extLocation,
438 last_ext->extLength, 1);
439
440 /* Managed to do everything necessary? */
441 if (!blocks)
442 goto out;
443
444 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
445 last_ext->extLocation.logicalBlockNum = 0;
446 last_ext->extLocation.partitionReferenceNum = 0;
447 add = (1 << (30-sb->s_blocksize_bits)) - 1;
448 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
449 (add << sb->s_blocksize_bits);
450
451 /* Create enough extents to cover the whole hole */
452 while (blocks > add) {
453 blocks -= add;
454 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
455 last_ext->extLength, 1);
456 if (err)
457 return err;
458 count++;
459 }
460 if (blocks) {
461 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
462 (blocks << sb->s_blocksize_bits);
463 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
464 last_ext->extLength, 1);
465 if (err)
466 return err;
467 count++;
468 }
469
470 out:
471 /* Do we have some preallocated blocks saved? */
472 if (prealloc_len) {
473 err = udf_add_aext(inode, last_pos, &prealloc_loc,
474 prealloc_len, 1);
475 if (err)
476 return err;
477 last_ext->extLocation = prealloc_loc;
478 last_ext->extLength = prealloc_len;
479 count++;
480 }
481
482 /* last_pos should point to the last written extent... */
483 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
484 last_pos->offset -= sizeof(struct short_ad);
485 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
486 last_pos->offset -= sizeof(struct long_ad);
487 else
488 return -EIO;
489
490 return count;
491 }
492
493 static int udf_extend_file(struct inode *inode, loff_t newsize)
494 {
495
496 struct extent_position epos;
497 struct kernel_lb_addr eloc;
498 uint32_t elen;
499 int8_t etype;
500 struct super_block *sb = inode->i_sb;
501 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
502 int adsize;
503 struct udf_inode_info *iinfo = UDF_I(inode);
504 struct kernel_long_ad extent;
505 int err;
506
507 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
508 adsize = sizeof(struct short_ad);
509 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
510 adsize = sizeof(struct long_ad);
511 else
512 BUG();
513
514 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
515
516 /* File has extent covering the new size (could happen when extending
517 * inside a block)? */
518 if (etype != -1)
519 return 0;
520 if (newsize & (sb->s_blocksize - 1))
521 offset++;
522 /* Extended file just to the boundary of the last file block? */
523 if (offset == 0)
524 return 0;
525
526 /* Truncate is extending the file by 'offset' blocks */
527 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
528 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
529 /* File has no extents at all or has empty last
530 * indirect extent! Create a fake extent... */
531 extent.extLocation.logicalBlockNum = 0;
532 extent.extLocation.partitionReferenceNum = 0;
533 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
534 } else {
535 epos.offset -= adsize;
536 etype = udf_next_aext(inode, &epos, &extent.extLocation,
537 &extent.extLength, 0);
538 extent.extLength |= etype << 30;
539 }
540 err = udf_do_extend_file(inode, &epos, &extent, offset);
541 if (err < 0)
542 goto out;
543 err = 0;
544 iinfo->i_lenExtents = newsize;
545 out:
546 brelse(epos.bh);
547 return err;
548 }
549
550 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
551 int *err, sector_t *phys, int *new)
552 {
553 static sector_t last_block;
554 struct buffer_head *result = NULL;
555 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
556 struct extent_position prev_epos, cur_epos, next_epos;
557 int count = 0, startnum = 0, endnum = 0;
558 uint32_t elen = 0, tmpelen;
559 struct kernel_lb_addr eloc, tmpeloc;
560 int c = 1;
561 loff_t lbcount = 0, b_off = 0;
562 uint32_t newblocknum, newblock;
563 sector_t offset = 0;
564 int8_t etype;
565 struct udf_inode_info *iinfo = UDF_I(inode);
566 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
567 int lastblock = 0;
568
569 prev_epos.offset = udf_file_entry_alloc_offset(inode);
570 prev_epos.block = iinfo->i_location;
571 prev_epos.bh = NULL;
572 cur_epos = next_epos = prev_epos;
573 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
574
575 /* find the extent which contains the block we are looking for.
576 alternate between laarr[0] and laarr[1] for locations of the
577 current extent, and the previous extent */
578 do {
579 if (prev_epos.bh != cur_epos.bh) {
580 brelse(prev_epos.bh);
581 get_bh(cur_epos.bh);
582 prev_epos.bh = cur_epos.bh;
583 }
584 if (cur_epos.bh != next_epos.bh) {
585 brelse(cur_epos.bh);
586 get_bh(next_epos.bh);
587 cur_epos.bh = next_epos.bh;
588 }
589
590 lbcount += elen;
591
592 prev_epos.block = cur_epos.block;
593 cur_epos.block = next_epos.block;
594
595 prev_epos.offset = cur_epos.offset;
596 cur_epos.offset = next_epos.offset;
597
598 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
599 if (etype == -1)
600 break;
601
602 c = !c;
603
604 laarr[c].extLength = (etype << 30) | elen;
605 laarr[c].extLocation = eloc;
606
607 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
608 pgoal = eloc.logicalBlockNum +
609 ((elen + inode->i_sb->s_blocksize - 1) >>
610 inode->i_sb->s_blocksize_bits);
611
612 count++;
613 } while (lbcount + elen <= b_off);
614
615 b_off -= lbcount;
616 offset = b_off >> inode->i_sb->s_blocksize_bits;
617 /*
618 * Move prev_epos and cur_epos into indirect extent if we are at
619 * the pointer to it
620 */
621 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
622 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
623
624 /* if the extent is allocated and recorded, return the block
625 if the extent is not a multiple of the blocksize, round up */
626
627 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
628 if (elen & (inode->i_sb->s_blocksize - 1)) {
629 elen = EXT_RECORDED_ALLOCATED |
630 ((elen + inode->i_sb->s_blocksize - 1) &
631 ~(inode->i_sb->s_blocksize - 1));
632 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
633 }
634 brelse(prev_epos.bh);
635 brelse(cur_epos.bh);
636 brelse(next_epos.bh);
637 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
638 *phys = newblock;
639 return NULL;
640 }
641
642 last_block = block;
643 /* Are we beyond EOF? */
644 if (etype == -1) {
645 int ret;
646
647 if (count) {
648 if (c)
649 laarr[0] = laarr[1];
650 startnum = 1;
651 } else {
652 /* Create a fake extent when there's not one */
653 memset(&laarr[0].extLocation, 0x00,
654 sizeof(struct kernel_lb_addr));
655 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
656 /* Will udf_do_extend_file() create real extent from
657 a fake one? */
658 startnum = (offset > 0);
659 }
660 /* Create extents for the hole between EOF and offset */
661 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
662 if (ret < 0) {
663 brelse(prev_epos.bh);
664 brelse(cur_epos.bh);
665 brelse(next_epos.bh);
666 *err = ret;
667 return NULL;
668 }
669 c = 0;
670 offset = 0;
671 count += ret;
672 /* We are not covered by a preallocated extent? */
673 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
674 EXT_NOT_RECORDED_ALLOCATED) {
675 /* Is there any real extent? - otherwise we overwrite
676 * the fake one... */
677 if (count)
678 c = !c;
679 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
680 inode->i_sb->s_blocksize;
681 memset(&laarr[c].extLocation, 0x00,
682 sizeof(struct kernel_lb_addr));
683 count++;
684 endnum++;
685 }
686 endnum = c + 1;
687 lastblock = 1;
688 } else {
689 endnum = startnum = ((count > 2) ? 2 : count);
690
691 /* if the current extent is in position 0,
692 swap it with the previous */
693 if (!c && count != 1) {
694 laarr[2] = laarr[0];
695 laarr[0] = laarr[1];
696 laarr[1] = laarr[2];
697 c = 1;
698 }
699
700 /* if the current block is located in an extent,
701 read the next extent */
702 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
703 if (etype != -1) {
704 laarr[c + 1].extLength = (etype << 30) | elen;
705 laarr[c + 1].extLocation = eloc;
706 count++;
707 startnum++;
708 endnum++;
709 } else
710 lastblock = 1;
711 }
712
713 /* if the current extent is not recorded but allocated, get the
714 * block in the extent corresponding to the requested block */
715 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
716 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
717 else { /* otherwise, allocate a new block */
718 if (iinfo->i_next_alloc_block == block)
719 goal = iinfo->i_next_alloc_goal;
720
721 if (!goal) {
722 if (!(goal = pgoal)) /* XXX: what was intended here? */
723 goal = iinfo->i_location.logicalBlockNum + 1;
724 }
725
726 newblocknum = udf_new_block(inode->i_sb, inode,
727 iinfo->i_location.partitionReferenceNum,
728 goal, err);
729 if (!newblocknum) {
730 brelse(prev_epos.bh);
731 *err = -ENOSPC;
732 return NULL;
733 }
734 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
735 }
736
737 /* if the extent the requsted block is located in contains multiple
738 * blocks, split the extent into at most three extents. blocks prior
739 * to requested block, requested block, and blocks after requested
740 * block */
741 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
742
743 #ifdef UDF_PREALLOCATE
744 /* We preallocate blocks only for regular files. It also makes sense
745 * for directories but there's a problem when to drop the
746 * preallocation. We might use some delayed work for that but I feel
747 * it's overengineering for a filesystem like UDF. */
748 if (S_ISREG(inode->i_mode))
749 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
750 #endif
751
752 /* merge any continuous blocks in laarr */
753 udf_merge_extents(inode, laarr, &endnum);
754
755 /* write back the new extents, inserting new extents if the new number
756 * of extents is greater than the old number, and deleting extents if
757 * the new number of extents is less than the old number */
758 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
759
760 brelse(prev_epos.bh);
761
762 newblock = udf_get_pblock(inode->i_sb, newblocknum,
763 iinfo->i_location.partitionReferenceNum, 0);
764 if (!newblock)
765 return NULL;
766 *phys = newblock;
767 *err = 0;
768 *new = 1;
769 iinfo->i_next_alloc_block = block;
770 iinfo->i_next_alloc_goal = newblocknum;
771 inode->i_ctime = current_fs_time(inode->i_sb);
772
773 if (IS_SYNC(inode))
774 udf_sync_inode(inode);
775 else
776 mark_inode_dirty(inode);
777
778 return result;
779 }
780
781 static void udf_split_extents(struct inode *inode, int *c, int offset,
782 int newblocknum,
783 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
784 int *endnum)
785 {
786 unsigned long blocksize = inode->i_sb->s_blocksize;
787 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
788
789 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
790 (laarr[*c].extLength >> 30) ==
791 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
792 int curr = *c;
793 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
794 blocksize - 1) >> blocksize_bits;
795 int8_t etype = (laarr[curr].extLength >> 30);
796
797 if (blen == 1)
798 ;
799 else if (!offset || blen == offset + 1) {
800 laarr[curr + 2] = laarr[curr + 1];
801 laarr[curr + 1] = laarr[curr];
802 } else {
803 laarr[curr + 3] = laarr[curr + 1];
804 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
805 }
806
807 if (offset) {
808 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
809 udf_free_blocks(inode->i_sb, inode,
810 &laarr[curr].extLocation,
811 0, offset);
812 laarr[curr].extLength =
813 EXT_NOT_RECORDED_NOT_ALLOCATED |
814 (offset << blocksize_bits);
815 laarr[curr].extLocation.logicalBlockNum = 0;
816 laarr[curr].extLocation.
817 partitionReferenceNum = 0;
818 } else
819 laarr[curr].extLength = (etype << 30) |
820 (offset << blocksize_bits);
821 curr++;
822 (*c)++;
823 (*endnum)++;
824 }
825
826 laarr[curr].extLocation.logicalBlockNum = newblocknum;
827 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
828 laarr[curr].extLocation.partitionReferenceNum =
829 UDF_I(inode)->i_location.partitionReferenceNum;
830 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
831 blocksize;
832 curr++;
833
834 if (blen != offset + 1) {
835 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
836 laarr[curr].extLocation.logicalBlockNum +=
837 offset + 1;
838 laarr[curr].extLength = (etype << 30) |
839 ((blen - (offset + 1)) << blocksize_bits);
840 curr++;
841 (*endnum)++;
842 }
843 }
844 }
845
846 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
847 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
848 int *endnum)
849 {
850 int start, length = 0, currlength = 0, i;
851
852 if (*endnum >= (c + 1)) {
853 if (!lastblock)
854 return;
855 else
856 start = c;
857 } else {
858 if ((laarr[c + 1].extLength >> 30) ==
859 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
860 start = c + 1;
861 length = currlength =
862 (((laarr[c + 1].extLength &
863 UDF_EXTENT_LENGTH_MASK) +
864 inode->i_sb->s_blocksize - 1) >>
865 inode->i_sb->s_blocksize_bits);
866 } else
867 start = c;
868 }
869
870 for (i = start + 1; i <= *endnum; i++) {
871 if (i == *endnum) {
872 if (lastblock)
873 length += UDF_DEFAULT_PREALLOC_BLOCKS;
874 } else if ((laarr[i].extLength >> 30) ==
875 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
876 length += (((laarr[i].extLength &
877 UDF_EXTENT_LENGTH_MASK) +
878 inode->i_sb->s_blocksize - 1) >>
879 inode->i_sb->s_blocksize_bits);
880 } else
881 break;
882 }
883
884 if (length) {
885 int next = laarr[start].extLocation.logicalBlockNum +
886 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
887 inode->i_sb->s_blocksize - 1) >>
888 inode->i_sb->s_blocksize_bits);
889 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
890 laarr[start].extLocation.partitionReferenceNum,
891 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
892 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
893 currlength);
894 if (numalloc) {
895 if (start == (c + 1))
896 laarr[start].extLength +=
897 (numalloc <<
898 inode->i_sb->s_blocksize_bits);
899 else {
900 memmove(&laarr[c + 2], &laarr[c + 1],
901 sizeof(struct long_ad) * (*endnum - (c + 1)));
902 (*endnum)++;
903 laarr[c + 1].extLocation.logicalBlockNum = next;
904 laarr[c + 1].extLocation.partitionReferenceNum =
905 laarr[c].extLocation.
906 partitionReferenceNum;
907 laarr[c + 1].extLength =
908 EXT_NOT_RECORDED_ALLOCATED |
909 (numalloc <<
910 inode->i_sb->s_blocksize_bits);
911 start = c + 1;
912 }
913
914 for (i = start + 1; numalloc && i < *endnum; i++) {
915 int elen = ((laarr[i].extLength &
916 UDF_EXTENT_LENGTH_MASK) +
917 inode->i_sb->s_blocksize - 1) >>
918 inode->i_sb->s_blocksize_bits;
919
920 if (elen > numalloc) {
921 laarr[i].extLength -=
922 (numalloc <<
923 inode->i_sb->s_blocksize_bits);
924 numalloc = 0;
925 } else {
926 numalloc -= elen;
927 if (*endnum > (i + 1))
928 memmove(&laarr[i],
929 &laarr[i + 1],
930 sizeof(struct long_ad) *
931 (*endnum - (i + 1)));
932 i--;
933 (*endnum)--;
934 }
935 }
936 UDF_I(inode)->i_lenExtents +=
937 numalloc << inode->i_sb->s_blocksize_bits;
938 }
939 }
940 }
941
942 static void udf_merge_extents(struct inode *inode,
943 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
944 int *endnum)
945 {
946 int i;
947 unsigned long blocksize = inode->i_sb->s_blocksize;
948 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
949
950 for (i = 0; i < (*endnum - 1); i++) {
951 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
952 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
953
954 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
955 (((li->extLength >> 30) ==
956 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
957 ((lip1->extLocation.logicalBlockNum -
958 li->extLocation.logicalBlockNum) ==
959 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
960 blocksize - 1) >> blocksize_bits)))) {
961
962 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
963 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
964 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
965 lip1->extLength = (lip1->extLength -
966 (li->extLength &
967 UDF_EXTENT_LENGTH_MASK) +
968 UDF_EXTENT_LENGTH_MASK) &
969 ~(blocksize - 1);
970 li->extLength = (li->extLength &
971 UDF_EXTENT_FLAG_MASK) +
972 (UDF_EXTENT_LENGTH_MASK + 1) -
973 blocksize;
974 lip1->extLocation.logicalBlockNum =
975 li->extLocation.logicalBlockNum +
976 ((li->extLength &
977 UDF_EXTENT_LENGTH_MASK) >>
978 blocksize_bits);
979 } else {
980 li->extLength = lip1->extLength +
981 (((li->extLength &
982 UDF_EXTENT_LENGTH_MASK) +
983 blocksize - 1) & ~(blocksize - 1));
984 if (*endnum > (i + 2))
985 memmove(&laarr[i + 1], &laarr[i + 2],
986 sizeof(struct long_ad) *
987 (*endnum - (i + 2)));
988 i--;
989 (*endnum)--;
990 }
991 } else if (((li->extLength >> 30) ==
992 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
993 ((lip1->extLength >> 30) ==
994 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
995 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
996 ((li->extLength &
997 UDF_EXTENT_LENGTH_MASK) +
998 blocksize - 1) >> blocksize_bits);
999 li->extLocation.logicalBlockNum = 0;
1000 li->extLocation.partitionReferenceNum = 0;
1001
1002 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1003 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1004 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1005 lip1->extLength = (lip1->extLength -
1006 (li->extLength &
1007 UDF_EXTENT_LENGTH_MASK) +
1008 UDF_EXTENT_LENGTH_MASK) &
1009 ~(blocksize - 1);
1010 li->extLength = (li->extLength &
1011 UDF_EXTENT_FLAG_MASK) +
1012 (UDF_EXTENT_LENGTH_MASK + 1) -
1013 blocksize;
1014 } else {
1015 li->extLength = lip1->extLength +
1016 (((li->extLength &
1017 UDF_EXTENT_LENGTH_MASK) +
1018 blocksize - 1) & ~(blocksize - 1));
1019 if (*endnum > (i + 2))
1020 memmove(&laarr[i + 1], &laarr[i + 2],
1021 sizeof(struct long_ad) *
1022 (*endnum - (i + 2)));
1023 i--;
1024 (*endnum)--;
1025 }
1026 } else if ((li->extLength >> 30) ==
1027 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1028 udf_free_blocks(inode->i_sb, inode,
1029 &li->extLocation, 0,
1030 ((li->extLength &
1031 UDF_EXTENT_LENGTH_MASK) +
1032 blocksize - 1) >> blocksize_bits);
1033 li->extLocation.logicalBlockNum = 0;
1034 li->extLocation.partitionReferenceNum = 0;
1035 li->extLength = (li->extLength &
1036 UDF_EXTENT_LENGTH_MASK) |
1037 EXT_NOT_RECORDED_NOT_ALLOCATED;
1038 }
1039 }
1040 }
1041
1042 static void udf_update_extents(struct inode *inode,
1043 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1044 int startnum, int endnum,
1045 struct extent_position *epos)
1046 {
1047 int start = 0, i;
1048 struct kernel_lb_addr tmploc;
1049 uint32_t tmplen;
1050
1051 if (startnum > endnum) {
1052 for (i = 0; i < (startnum - endnum); i++)
1053 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1054 laarr[i].extLength);
1055 } else if (startnum < endnum) {
1056 for (i = 0; i < (endnum - startnum); i++) {
1057 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1058 laarr[i].extLength);
1059 udf_next_aext(inode, epos, &laarr[i].extLocation,
1060 &laarr[i].extLength, 1);
1061 start++;
1062 }
1063 }
1064
1065 for (i = start; i < endnum; i++) {
1066 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1067 udf_write_aext(inode, epos, &laarr[i].extLocation,
1068 laarr[i].extLength, 1);
1069 }
1070 }
1071
1072 struct buffer_head *udf_bread(struct inode *inode, int block,
1073 int create, int *err)
1074 {
1075 struct buffer_head *bh = NULL;
1076
1077 bh = udf_getblk(inode, block, create, err);
1078 if (!bh)
1079 return NULL;
1080
1081 if (buffer_uptodate(bh))
1082 return bh;
1083
1084 ll_rw_block(READ, 1, &bh);
1085
1086 wait_on_buffer(bh);
1087 if (buffer_uptodate(bh))
1088 return bh;
1089
1090 brelse(bh);
1091 *err = -EIO;
1092 return NULL;
1093 }
1094
1095 int udf_setsize(struct inode *inode, loff_t newsize)
1096 {
1097 int err;
1098 struct udf_inode_info *iinfo;
1099 int bsize = 1 << inode->i_blkbits;
1100
1101 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1102 S_ISLNK(inode->i_mode)))
1103 return -EINVAL;
1104 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1105 return -EPERM;
1106
1107 iinfo = UDF_I(inode);
1108 if (newsize > inode->i_size) {
1109 down_write(&iinfo->i_data_sem);
1110 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1111 if (bsize <
1112 (udf_file_entry_alloc_offset(inode) + newsize)) {
1113 err = udf_expand_file_adinicb(inode);
1114 if (err) {
1115 up_write(&iinfo->i_data_sem);
1116 return err;
1117 }
1118 } else
1119 iinfo->i_lenAlloc = newsize;
1120 }
1121 err = udf_extend_file(inode, newsize);
1122 if (err) {
1123 up_write(&iinfo->i_data_sem);
1124 return err;
1125 }
1126 truncate_setsize(inode, newsize);
1127 up_write(&iinfo->i_data_sem);
1128 } else {
1129 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1130 down_write(&iinfo->i_data_sem);
1131 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1132 0x00, bsize - newsize -
1133 udf_file_entry_alloc_offset(inode));
1134 iinfo->i_lenAlloc = newsize;
1135 truncate_setsize(inode, newsize);
1136 up_write(&iinfo->i_data_sem);
1137 goto update_time;
1138 }
1139 err = block_truncate_page(inode->i_mapping, newsize,
1140 udf_get_block);
1141 if (err)
1142 return err;
1143 down_write(&iinfo->i_data_sem);
1144 truncate_setsize(inode, newsize);
1145 udf_truncate_extents(inode);
1146 up_write(&iinfo->i_data_sem);
1147 }
1148 update_time:
1149 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1150 if (IS_SYNC(inode))
1151 udf_sync_inode(inode);
1152 else
1153 mark_inode_dirty(inode);
1154 return 0;
1155 }
1156
1157 static void __udf_read_inode(struct inode *inode)
1158 {
1159 struct buffer_head *bh = NULL;
1160 struct fileEntry *fe;
1161 uint16_t ident;
1162 struct udf_inode_info *iinfo = UDF_I(inode);
1163
1164 /*
1165 * Set defaults, but the inode is still incomplete!
1166 * Note: get_new_inode() sets the following on a new inode:
1167 * i_sb = sb
1168 * i_no = ino
1169 * i_flags = sb->s_flags
1170 * i_state = 0
1171 * clean_inode(): zero fills and sets
1172 * i_count = 1
1173 * i_nlink = 1
1174 * i_op = NULL;
1175 */
1176 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1177 if (!bh) {
1178 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1179 make_bad_inode(inode);
1180 return;
1181 }
1182
1183 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1184 ident != TAG_IDENT_USE) {
1185 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1186 inode->i_ino, ident);
1187 brelse(bh);
1188 make_bad_inode(inode);
1189 return;
1190 }
1191
1192 fe = (struct fileEntry *)bh->b_data;
1193
1194 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1195 struct buffer_head *ibh;
1196
1197 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1198 &ident);
1199 if (ident == TAG_IDENT_IE && ibh) {
1200 struct buffer_head *nbh = NULL;
1201 struct kernel_lb_addr loc;
1202 struct indirectEntry *ie;
1203
1204 ie = (struct indirectEntry *)ibh->b_data;
1205 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1206
1207 if (ie->indirectICB.extLength &&
1208 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1209 &ident))) {
1210 if (ident == TAG_IDENT_FE ||
1211 ident == TAG_IDENT_EFE) {
1212 memcpy(&iinfo->i_location,
1213 &loc,
1214 sizeof(struct kernel_lb_addr));
1215 brelse(bh);
1216 brelse(ibh);
1217 brelse(nbh);
1218 __udf_read_inode(inode);
1219 return;
1220 }
1221 brelse(nbh);
1222 }
1223 }
1224 brelse(ibh);
1225 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1226 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1227 le16_to_cpu(fe->icbTag.strategyType));
1228 brelse(bh);
1229 make_bad_inode(inode);
1230 return;
1231 }
1232 udf_fill_inode(inode, bh);
1233
1234 brelse(bh);
1235 }
1236
1237 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1238 {
1239 struct fileEntry *fe;
1240 struct extendedFileEntry *efe;
1241 int offset;
1242 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1243 struct udf_inode_info *iinfo = UDF_I(inode);
1244 unsigned int link_count;
1245
1246 fe = (struct fileEntry *)bh->b_data;
1247 efe = (struct extendedFileEntry *)bh->b_data;
1248
1249 if (fe->icbTag.strategyType == cpu_to_le16(4))
1250 iinfo->i_strat4096 = 0;
1251 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1252 iinfo->i_strat4096 = 1;
1253
1254 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1255 ICBTAG_FLAG_AD_MASK;
1256 iinfo->i_unique = 0;
1257 iinfo->i_lenEAttr = 0;
1258 iinfo->i_lenExtents = 0;
1259 iinfo->i_lenAlloc = 0;
1260 iinfo->i_next_alloc_block = 0;
1261 iinfo->i_next_alloc_goal = 0;
1262 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1263 iinfo->i_efe = 1;
1264 iinfo->i_use = 0;
1265 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1266 sizeof(struct extendedFileEntry))) {
1267 make_bad_inode(inode);
1268 return;
1269 }
1270 memcpy(iinfo->i_ext.i_data,
1271 bh->b_data + sizeof(struct extendedFileEntry),
1272 inode->i_sb->s_blocksize -
1273 sizeof(struct extendedFileEntry));
1274 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1275 iinfo->i_efe = 0;
1276 iinfo->i_use = 0;
1277 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1278 sizeof(struct fileEntry))) {
1279 make_bad_inode(inode);
1280 return;
1281 }
1282 memcpy(iinfo->i_ext.i_data,
1283 bh->b_data + sizeof(struct fileEntry),
1284 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1285 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1286 iinfo->i_efe = 0;
1287 iinfo->i_use = 1;
1288 iinfo->i_lenAlloc = le32_to_cpu(
1289 ((struct unallocSpaceEntry *)bh->b_data)->
1290 lengthAllocDescs);
1291 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1292 sizeof(struct unallocSpaceEntry))) {
1293 make_bad_inode(inode);
1294 return;
1295 }
1296 memcpy(iinfo->i_ext.i_data,
1297 bh->b_data + sizeof(struct unallocSpaceEntry),
1298 inode->i_sb->s_blocksize -
1299 sizeof(struct unallocSpaceEntry));
1300 return;
1301 }
1302
1303 read_lock(&sbi->s_cred_lock);
1304 inode->i_uid = le32_to_cpu(fe->uid);
1305 if (inode->i_uid == -1 ||
1306 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1307 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1308 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1309
1310 inode->i_gid = le32_to_cpu(fe->gid);
1311 if (inode->i_gid == -1 ||
1312 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1313 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1314 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1315
1316 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1317 sbi->s_fmode != UDF_INVALID_MODE)
1318 inode->i_mode = sbi->s_fmode;
1319 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1320 sbi->s_dmode != UDF_INVALID_MODE)
1321 inode->i_mode = sbi->s_dmode;
1322 else
1323 inode->i_mode = udf_convert_permissions(fe);
1324 inode->i_mode &= ~sbi->s_umask;
1325 read_unlock(&sbi->s_cred_lock);
1326
1327 link_count = le16_to_cpu(fe->fileLinkCount);
1328 if (!link_count)
1329 link_count = 1;
1330 set_nlink(inode, link_count);
1331
1332 inode->i_size = le64_to_cpu(fe->informationLength);
1333 iinfo->i_lenExtents = inode->i_size;
1334
1335 if (iinfo->i_efe == 0) {
1336 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1337 (inode->i_sb->s_blocksize_bits - 9);
1338
1339 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1340 inode->i_atime = sbi->s_record_time;
1341
1342 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1343 fe->modificationTime))
1344 inode->i_mtime = sbi->s_record_time;
1345
1346 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1347 inode->i_ctime = sbi->s_record_time;
1348
1349 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1350 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1351 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1352 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1353 } else {
1354 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1355 (inode->i_sb->s_blocksize_bits - 9);
1356
1357 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1358 inode->i_atime = sbi->s_record_time;
1359
1360 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1361 efe->modificationTime))
1362 inode->i_mtime = sbi->s_record_time;
1363
1364 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1365 iinfo->i_crtime = sbi->s_record_time;
1366
1367 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1368 inode->i_ctime = sbi->s_record_time;
1369
1370 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1371 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1372 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1373 offset = sizeof(struct extendedFileEntry) +
1374 iinfo->i_lenEAttr;
1375 }
1376
1377 switch (fe->icbTag.fileType) {
1378 case ICBTAG_FILE_TYPE_DIRECTORY:
1379 inode->i_op = &udf_dir_inode_operations;
1380 inode->i_fop = &udf_dir_operations;
1381 inode->i_mode |= S_IFDIR;
1382 inc_nlink(inode);
1383 break;
1384 case ICBTAG_FILE_TYPE_REALTIME:
1385 case ICBTAG_FILE_TYPE_REGULAR:
1386 case ICBTAG_FILE_TYPE_UNDEF:
1387 case ICBTAG_FILE_TYPE_VAT20:
1388 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1389 inode->i_data.a_ops = &udf_adinicb_aops;
1390 else
1391 inode->i_data.a_ops = &udf_aops;
1392 inode->i_op = &udf_file_inode_operations;
1393 inode->i_fop = &udf_file_operations;
1394 inode->i_mode |= S_IFREG;
1395 break;
1396 case ICBTAG_FILE_TYPE_BLOCK:
1397 inode->i_mode |= S_IFBLK;
1398 break;
1399 case ICBTAG_FILE_TYPE_CHAR:
1400 inode->i_mode |= S_IFCHR;
1401 break;
1402 case ICBTAG_FILE_TYPE_FIFO:
1403 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1404 break;
1405 case ICBTAG_FILE_TYPE_SOCKET:
1406 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1407 break;
1408 case ICBTAG_FILE_TYPE_SYMLINK:
1409 inode->i_data.a_ops = &udf_symlink_aops;
1410 inode->i_op = &udf_symlink_inode_operations;
1411 inode->i_mode = S_IFLNK | S_IRWXUGO;
1412 break;
1413 case ICBTAG_FILE_TYPE_MAIN:
1414 udf_debug("METADATA FILE-----\n");
1415 break;
1416 case ICBTAG_FILE_TYPE_MIRROR:
1417 udf_debug("METADATA MIRROR FILE-----\n");
1418 break;
1419 case ICBTAG_FILE_TYPE_BITMAP:
1420 udf_debug("METADATA BITMAP FILE-----\n");
1421 break;
1422 default:
1423 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1424 inode->i_ino, fe->icbTag.fileType);
1425 make_bad_inode(inode);
1426 return;
1427 }
1428 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1429 struct deviceSpec *dsea =
1430 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1431 if (dsea) {
1432 init_special_inode(inode, inode->i_mode,
1433 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1434 le32_to_cpu(dsea->minorDeviceIdent)));
1435 /* Developer ID ??? */
1436 } else
1437 make_bad_inode(inode);
1438 }
1439 }
1440
1441 static int udf_alloc_i_data(struct inode *inode, size_t size)
1442 {
1443 struct udf_inode_info *iinfo = UDF_I(inode);
1444 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1445
1446 if (!iinfo->i_ext.i_data) {
1447 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1448 inode->i_ino);
1449 return -ENOMEM;
1450 }
1451
1452 return 0;
1453 }
1454
1455 static mode_t udf_convert_permissions(struct fileEntry *fe)
1456 {
1457 mode_t mode;
1458 uint32_t permissions;
1459 uint32_t flags;
1460
1461 permissions = le32_to_cpu(fe->permissions);
1462 flags = le16_to_cpu(fe->icbTag.flags);
1463
1464 mode = ((permissions) & S_IRWXO) |
1465 ((permissions >> 2) & S_IRWXG) |
1466 ((permissions >> 4) & S_IRWXU) |
1467 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1468 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1469 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1470
1471 return mode;
1472 }
1473
1474 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1475 {
1476 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1477 }
1478
1479 static int udf_sync_inode(struct inode *inode)
1480 {
1481 return udf_update_inode(inode, 1);
1482 }
1483
1484 static int udf_update_inode(struct inode *inode, int do_sync)
1485 {
1486 struct buffer_head *bh = NULL;
1487 struct fileEntry *fe;
1488 struct extendedFileEntry *efe;
1489 uint32_t udfperms;
1490 uint16_t icbflags;
1491 uint16_t crclen;
1492 int err = 0;
1493 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1494 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1495 struct udf_inode_info *iinfo = UDF_I(inode);
1496
1497 bh = udf_tgetblk(inode->i_sb,
1498 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1499 if (!bh) {
1500 udf_debug("getblk failure\n");
1501 return -ENOMEM;
1502 }
1503
1504 lock_buffer(bh);
1505 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1506 fe = (struct fileEntry *)bh->b_data;
1507 efe = (struct extendedFileEntry *)bh->b_data;
1508
1509 if (iinfo->i_use) {
1510 struct unallocSpaceEntry *use =
1511 (struct unallocSpaceEntry *)bh->b_data;
1512
1513 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1514 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1515 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1516 sizeof(struct unallocSpaceEntry));
1517 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1518 use->descTag.tagLocation =
1519 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1520 crclen = sizeof(struct unallocSpaceEntry) +
1521 iinfo->i_lenAlloc - sizeof(struct tag);
1522 use->descTag.descCRCLength = cpu_to_le16(crclen);
1523 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1524 sizeof(struct tag),
1525 crclen));
1526 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1527
1528 goto out;
1529 }
1530
1531 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1532 fe->uid = cpu_to_le32(-1);
1533 else
1534 fe->uid = cpu_to_le32(inode->i_uid);
1535
1536 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1537 fe->gid = cpu_to_le32(-1);
1538 else
1539 fe->gid = cpu_to_le32(inode->i_gid);
1540
1541 udfperms = ((inode->i_mode & S_IRWXO)) |
1542 ((inode->i_mode & S_IRWXG) << 2) |
1543 ((inode->i_mode & S_IRWXU) << 4);
1544
1545 udfperms |= (le32_to_cpu(fe->permissions) &
1546 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1547 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1548 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1549 fe->permissions = cpu_to_le32(udfperms);
1550
1551 if (S_ISDIR(inode->i_mode))
1552 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1553 else
1554 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1555
1556 fe->informationLength = cpu_to_le64(inode->i_size);
1557
1558 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1559 struct regid *eid;
1560 struct deviceSpec *dsea =
1561 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1562 if (!dsea) {
1563 dsea = (struct deviceSpec *)
1564 udf_add_extendedattr(inode,
1565 sizeof(struct deviceSpec) +
1566 sizeof(struct regid), 12, 0x3);
1567 dsea->attrType = cpu_to_le32(12);
1568 dsea->attrSubtype = 1;
1569 dsea->attrLength = cpu_to_le32(
1570 sizeof(struct deviceSpec) +
1571 sizeof(struct regid));
1572 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1573 }
1574 eid = (struct regid *)dsea->impUse;
1575 memset(eid, 0, sizeof(struct regid));
1576 strcpy(eid->ident, UDF_ID_DEVELOPER);
1577 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1578 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1579 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1580 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1581 }
1582
1583 if (iinfo->i_efe == 0) {
1584 memcpy(bh->b_data + sizeof(struct fileEntry),
1585 iinfo->i_ext.i_data,
1586 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1587 fe->logicalBlocksRecorded = cpu_to_le64(
1588 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1589 (blocksize_bits - 9));
1590
1591 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1592 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1593 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1594 memset(&(fe->impIdent), 0, sizeof(struct regid));
1595 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1596 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1597 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1598 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1599 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1600 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1601 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1602 crclen = sizeof(struct fileEntry);
1603 } else {
1604 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1605 iinfo->i_ext.i_data,
1606 inode->i_sb->s_blocksize -
1607 sizeof(struct extendedFileEntry));
1608 efe->objectSize = cpu_to_le64(inode->i_size);
1609 efe->logicalBlocksRecorded = cpu_to_le64(
1610 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1611 (blocksize_bits - 9));
1612
1613 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1614 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1615 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1616 iinfo->i_crtime = inode->i_atime;
1617
1618 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1619 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1620 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1621 iinfo->i_crtime = inode->i_mtime;
1622
1623 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1624 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1625 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1626 iinfo->i_crtime = inode->i_ctime;
1627
1628 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1629 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1630 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1631 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1632
1633 memset(&(efe->impIdent), 0, sizeof(struct regid));
1634 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1635 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1636 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1637 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1638 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1639 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1640 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1641 crclen = sizeof(struct extendedFileEntry);
1642 }
1643 if (iinfo->i_strat4096) {
1644 fe->icbTag.strategyType = cpu_to_le16(4096);
1645 fe->icbTag.strategyParameter = cpu_to_le16(1);
1646 fe->icbTag.numEntries = cpu_to_le16(2);
1647 } else {
1648 fe->icbTag.strategyType = cpu_to_le16(4);
1649 fe->icbTag.numEntries = cpu_to_le16(1);
1650 }
1651
1652 if (S_ISDIR(inode->i_mode))
1653 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1654 else if (S_ISREG(inode->i_mode))
1655 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1656 else if (S_ISLNK(inode->i_mode))
1657 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1658 else if (S_ISBLK(inode->i_mode))
1659 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1660 else if (S_ISCHR(inode->i_mode))
1661 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1662 else if (S_ISFIFO(inode->i_mode))
1663 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1664 else if (S_ISSOCK(inode->i_mode))
1665 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1666
1667 icbflags = iinfo->i_alloc_type |
1668 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1669 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1670 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1671 (le16_to_cpu(fe->icbTag.flags) &
1672 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1673 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1674
1675 fe->icbTag.flags = cpu_to_le16(icbflags);
1676 if (sbi->s_udfrev >= 0x0200)
1677 fe->descTag.descVersion = cpu_to_le16(3);
1678 else
1679 fe->descTag.descVersion = cpu_to_le16(2);
1680 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1681 fe->descTag.tagLocation = cpu_to_le32(
1682 iinfo->i_location.logicalBlockNum);
1683 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1684 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1685 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1686 crclen));
1687 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1688
1689 out:
1690 set_buffer_uptodate(bh);
1691 unlock_buffer(bh);
1692
1693 /* write the data blocks */
1694 mark_buffer_dirty(bh);
1695 if (do_sync) {
1696 sync_dirty_buffer(bh);
1697 if (buffer_write_io_error(bh)) {
1698 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1699 inode->i_ino);
1700 err = -EIO;
1701 }
1702 }
1703 brelse(bh);
1704
1705 return err;
1706 }
1707
1708 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1709 {
1710 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1711 struct inode *inode = iget_locked(sb, block);
1712
1713 if (!inode)
1714 return NULL;
1715
1716 if (inode->i_state & I_NEW) {
1717 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1718 __udf_read_inode(inode);
1719 unlock_new_inode(inode);
1720 }
1721
1722 if (is_bad_inode(inode))
1723 goto out_iput;
1724
1725 if (ino->logicalBlockNum >= UDF_SB(sb)->
1726 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1727 udf_debug("block=%d, partition=%d out of range\n",
1728 ino->logicalBlockNum, ino->partitionReferenceNum);
1729 make_bad_inode(inode);
1730 goto out_iput;
1731 }
1732
1733 return inode;
1734
1735 out_iput:
1736 iput(inode);
1737 return NULL;
1738 }
1739
1740 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1741 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1742 {
1743 int adsize;
1744 struct short_ad *sad = NULL;
1745 struct long_ad *lad = NULL;
1746 struct allocExtDesc *aed;
1747 uint8_t *ptr;
1748 struct udf_inode_info *iinfo = UDF_I(inode);
1749
1750 if (!epos->bh)
1751 ptr = iinfo->i_ext.i_data + epos->offset -
1752 udf_file_entry_alloc_offset(inode) +
1753 iinfo->i_lenEAttr;
1754 else
1755 ptr = epos->bh->b_data + epos->offset;
1756
1757 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1758 adsize = sizeof(struct short_ad);
1759 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1760 adsize = sizeof(struct long_ad);
1761 else
1762 return -EIO;
1763
1764 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1765 unsigned char *sptr, *dptr;
1766 struct buffer_head *nbh;
1767 int err, loffset;
1768 struct kernel_lb_addr obloc = epos->block;
1769
1770 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1771 obloc.partitionReferenceNum,
1772 obloc.logicalBlockNum, &err);
1773 if (!epos->block.logicalBlockNum)
1774 return -ENOSPC;
1775 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1776 &epos->block,
1777 0));
1778 if (!nbh)
1779 return -EIO;
1780 lock_buffer(nbh);
1781 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1782 set_buffer_uptodate(nbh);
1783 unlock_buffer(nbh);
1784 mark_buffer_dirty_inode(nbh, inode);
1785
1786 aed = (struct allocExtDesc *)(nbh->b_data);
1787 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1788 aed->previousAllocExtLocation =
1789 cpu_to_le32(obloc.logicalBlockNum);
1790 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1791 loffset = epos->offset;
1792 aed->lengthAllocDescs = cpu_to_le32(adsize);
1793 sptr = ptr - adsize;
1794 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1795 memcpy(dptr, sptr, adsize);
1796 epos->offset = sizeof(struct allocExtDesc) + adsize;
1797 } else {
1798 loffset = epos->offset + adsize;
1799 aed->lengthAllocDescs = cpu_to_le32(0);
1800 sptr = ptr;
1801 epos->offset = sizeof(struct allocExtDesc);
1802
1803 if (epos->bh) {
1804 aed = (struct allocExtDesc *)epos->bh->b_data;
1805 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1806 } else {
1807 iinfo->i_lenAlloc += adsize;
1808 mark_inode_dirty(inode);
1809 }
1810 }
1811 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1812 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1813 epos->block.logicalBlockNum, sizeof(struct tag));
1814 else
1815 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1816 epos->block.logicalBlockNum, sizeof(struct tag));
1817 switch (iinfo->i_alloc_type) {
1818 case ICBTAG_FLAG_AD_SHORT:
1819 sad = (struct short_ad *)sptr;
1820 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1821 inode->i_sb->s_blocksize);
1822 sad->extPosition =
1823 cpu_to_le32(epos->block.logicalBlockNum);
1824 break;
1825 case ICBTAG_FLAG_AD_LONG:
1826 lad = (struct long_ad *)sptr;
1827 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1828 inode->i_sb->s_blocksize);
1829 lad->extLocation = cpu_to_lelb(epos->block);
1830 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1831 break;
1832 }
1833 if (epos->bh) {
1834 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1835 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1836 udf_update_tag(epos->bh->b_data, loffset);
1837 else
1838 udf_update_tag(epos->bh->b_data,
1839 sizeof(struct allocExtDesc));
1840 mark_buffer_dirty_inode(epos->bh, inode);
1841 brelse(epos->bh);
1842 } else {
1843 mark_inode_dirty(inode);
1844 }
1845 epos->bh = nbh;
1846 }
1847
1848 udf_write_aext(inode, epos, eloc, elen, inc);
1849
1850 if (!epos->bh) {
1851 iinfo->i_lenAlloc += adsize;
1852 mark_inode_dirty(inode);
1853 } else {
1854 aed = (struct allocExtDesc *)epos->bh->b_data;
1855 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1856 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1857 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1858 udf_update_tag(epos->bh->b_data,
1859 epos->offset + (inc ? 0 : adsize));
1860 else
1861 udf_update_tag(epos->bh->b_data,
1862 sizeof(struct allocExtDesc));
1863 mark_buffer_dirty_inode(epos->bh, inode);
1864 }
1865
1866 return 0;
1867 }
1868
1869 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1870 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1871 {
1872 int adsize;
1873 uint8_t *ptr;
1874 struct short_ad *sad;
1875 struct long_ad *lad;
1876 struct udf_inode_info *iinfo = UDF_I(inode);
1877
1878 if (!epos->bh)
1879 ptr = iinfo->i_ext.i_data + epos->offset -
1880 udf_file_entry_alloc_offset(inode) +
1881 iinfo->i_lenEAttr;
1882 else
1883 ptr = epos->bh->b_data + epos->offset;
1884
1885 switch (iinfo->i_alloc_type) {
1886 case ICBTAG_FLAG_AD_SHORT:
1887 sad = (struct short_ad *)ptr;
1888 sad->extLength = cpu_to_le32(elen);
1889 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1890 adsize = sizeof(struct short_ad);
1891 break;
1892 case ICBTAG_FLAG_AD_LONG:
1893 lad = (struct long_ad *)ptr;
1894 lad->extLength = cpu_to_le32(elen);
1895 lad->extLocation = cpu_to_lelb(*eloc);
1896 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1897 adsize = sizeof(struct long_ad);
1898 break;
1899 default:
1900 return;
1901 }
1902
1903 if (epos->bh) {
1904 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1905 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1906 struct allocExtDesc *aed =
1907 (struct allocExtDesc *)epos->bh->b_data;
1908 udf_update_tag(epos->bh->b_data,
1909 le32_to_cpu(aed->lengthAllocDescs) +
1910 sizeof(struct allocExtDesc));
1911 }
1912 mark_buffer_dirty_inode(epos->bh, inode);
1913 } else {
1914 mark_inode_dirty(inode);
1915 }
1916
1917 if (inc)
1918 epos->offset += adsize;
1919 }
1920
1921 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1922 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1923 {
1924 int8_t etype;
1925
1926 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1927 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1928 int block;
1929 epos->block = *eloc;
1930 epos->offset = sizeof(struct allocExtDesc);
1931 brelse(epos->bh);
1932 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1933 epos->bh = udf_tread(inode->i_sb, block);
1934 if (!epos->bh) {
1935 udf_debug("reading block %d failed!\n", block);
1936 return -1;
1937 }
1938 }
1939
1940 return etype;
1941 }
1942
1943 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1944 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1945 {
1946 int alen;
1947 int8_t etype;
1948 uint8_t *ptr;
1949 struct short_ad *sad;
1950 struct long_ad *lad;
1951 struct udf_inode_info *iinfo = UDF_I(inode);
1952
1953 if (!epos->bh) {
1954 if (!epos->offset)
1955 epos->offset = udf_file_entry_alloc_offset(inode);
1956 ptr = iinfo->i_ext.i_data + epos->offset -
1957 udf_file_entry_alloc_offset(inode) +
1958 iinfo->i_lenEAttr;
1959 alen = udf_file_entry_alloc_offset(inode) +
1960 iinfo->i_lenAlloc;
1961 } else {
1962 if (!epos->offset)
1963 epos->offset = sizeof(struct allocExtDesc);
1964 ptr = epos->bh->b_data + epos->offset;
1965 alen = sizeof(struct allocExtDesc) +
1966 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1967 lengthAllocDescs);
1968 }
1969
1970 switch (iinfo->i_alloc_type) {
1971 case ICBTAG_FLAG_AD_SHORT:
1972 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1973 if (!sad)
1974 return -1;
1975 etype = le32_to_cpu(sad->extLength) >> 30;
1976 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1977 eloc->partitionReferenceNum =
1978 iinfo->i_location.partitionReferenceNum;
1979 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1980 break;
1981 case ICBTAG_FLAG_AD_LONG:
1982 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1983 if (!lad)
1984 return -1;
1985 etype = le32_to_cpu(lad->extLength) >> 30;
1986 *eloc = lelb_to_cpu(lad->extLocation);
1987 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1988 break;
1989 default:
1990 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
1991 return -1;
1992 }
1993
1994 return etype;
1995 }
1996
1997 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1998 struct kernel_lb_addr neloc, uint32_t nelen)
1999 {
2000 struct kernel_lb_addr oeloc;
2001 uint32_t oelen;
2002 int8_t etype;
2003
2004 if (epos.bh)
2005 get_bh(epos.bh);
2006
2007 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2008 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2009 neloc = oeloc;
2010 nelen = (etype << 30) | oelen;
2011 }
2012 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2013 brelse(epos.bh);
2014
2015 return (nelen >> 30);
2016 }
2017
2018 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2019 struct kernel_lb_addr eloc, uint32_t elen)
2020 {
2021 struct extent_position oepos;
2022 int adsize;
2023 int8_t etype;
2024 struct allocExtDesc *aed;
2025 struct udf_inode_info *iinfo;
2026
2027 if (epos.bh) {
2028 get_bh(epos.bh);
2029 get_bh(epos.bh);
2030 }
2031
2032 iinfo = UDF_I(inode);
2033 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2034 adsize = sizeof(struct short_ad);
2035 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2036 adsize = sizeof(struct long_ad);
2037 else
2038 adsize = 0;
2039
2040 oepos = epos;
2041 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2042 return -1;
2043
2044 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2045 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2046 if (oepos.bh != epos.bh) {
2047 oepos.block = epos.block;
2048 brelse(oepos.bh);
2049 get_bh(epos.bh);
2050 oepos.bh = epos.bh;
2051 oepos.offset = epos.offset - adsize;
2052 }
2053 }
2054 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2055 elen = 0;
2056
2057 if (epos.bh != oepos.bh) {
2058 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2059 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2060 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2061 if (!oepos.bh) {
2062 iinfo->i_lenAlloc -= (adsize * 2);
2063 mark_inode_dirty(inode);
2064 } else {
2065 aed = (struct allocExtDesc *)oepos.bh->b_data;
2066 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2067 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2068 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2069 udf_update_tag(oepos.bh->b_data,
2070 oepos.offset - (2 * adsize));
2071 else
2072 udf_update_tag(oepos.bh->b_data,
2073 sizeof(struct allocExtDesc));
2074 mark_buffer_dirty_inode(oepos.bh, inode);
2075 }
2076 } else {
2077 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2078 if (!oepos.bh) {
2079 iinfo->i_lenAlloc -= adsize;
2080 mark_inode_dirty(inode);
2081 } else {
2082 aed = (struct allocExtDesc *)oepos.bh->b_data;
2083 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2084 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2085 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2086 udf_update_tag(oepos.bh->b_data,
2087 epos.offset - adsize);
2088 else
2089 udf_update_tag(oepos.bh->b_data,
2090 sizeof(struct allocExtDesc));
2091 mark_buffer_dirty_inode(oepos.bh, inode);
2092 }
2093 }
2094
2095 brelse(epos.bh);
2096 brelse(oepos.bh);
2097
2098 return (elen >> 30);
2099 }
2100
2101 int8_t inode_bmap(struct inode *inode, sector_t block,
2102 struct extent_position *pos, struct kernel_lb_addr *eloc,
2103 uint32_t *elen, sector_t *offset)
2104 {
2105 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2106 loff_t lbcount = 0, bcount =
2107 (loff_t) block << blocksize_bits;
2108 int8_t etype;
2109 struct udf_inode_info *iinfo;
2110
2111 iinfo = UDF_I(inode);
2112 pos->offset = 0;
2113 pos->block = iinfo->i_location;
2114 pos->bh = NULL;
2115 *elen = 0;
2116
2117 do {
2118 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2119 if (etype == -1) {
2120 *offset = (bcount - lbcount) >> blocksize_bits;
2121 iinfo->i_lenExtents = lbcount;
2122 return -1;
2123 }
2124 lbcount += *elen;
2125 } while (lbcount <= bcount);
2126
2127 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2128
2129 return etype;
2130 }
2131
2132 long udf_block_map(struct inode *inode, sector_t block)
2133 {
2134 struct kernel_lb_addr eloc;
2135 uint32_t elen;
2136 sector_t offset;
2137 struct extent_position epos = {};
2138 int ret;
2139
2140 down_read(&UDF_I(inode)->i_data_sem);
2141
2142 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2143 (EXT_RECORDED_ALLOCATED >> 30))
2144 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2145 else
2146 ret = 0;
2147
2148 up_read(&UDF_I(inode)->i_data_sem);
2149 brelse(epos.bh);
2150
2151 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2152 return udf_fixed_to_variable(ret);
2153 else
2154 return ret;
2155 }
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