1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * inode.c
4 *
5 * PURPOSE
6 * Inode handling routines for the OSTA-UDF(tm) filesystem.
7 *
8 * COPYRIGHT
9 * (C) 1998 Dave Boynton
10 * (C) 1998-2004 Ben Fennema
11 * (C) 1999-2000 Stelias Computing Inc
12 *
13 * HISTORY
14 *
15 * 10/04/98 dgb Added rudimentary directory functions
16 * 10/07/98 Fully working udf_block_map! It works!
17 * 11/25/98 bmap altered to better support extents
18 * 12/06/98 blf partition support in udf_iget, udf_block_map
19 * and udf_read_inode
20 * 12/12/98 rewrote udf_block_map to handle next extents and descs across
21 * block boundaries (which is not actually allowed)
22 * 12/20/98 added support for strategy 4096
23 * 03/07/99 rewrote udf_block_map (again)
24 * New funcs, inode_bmap, udf_next_aext
25 * 04/19/99 Support for writing device EA's for major/minor #
26 */
27
28 #include "udfdecl.h"
29 #include <linux/mm.h>
30 #include <linux/module.h>
31 #include <linux/pagemap.h>
32 #include <linux/writeback.h>
33 #include <linux/slab.h>
34 #include <linux/crc-itu-t.h>
35 #include <linux/mpage.h>
36 #include <linux/uio.h>
37 #include <linux/bio.h>
38
39 #include "udf_i.h"
40 #include "udf_sb.h"
41
42 #define EXTENT_MERGE_SIZE 5
43
44 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
45 FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
46 FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
47
48 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
49 FE_PERM_O_DELETE)
50
51 struct udf_map_rq;
52
53 static umode_t udf_convert_permissions(struct fileEntry *);
54 static int udf_update_inode(struct inode *, int);
55 static int udf_sync_inode(struct inode *inode);
56 static int udf_alloc_i_data(struct inode *inode, size_t size);
57 static int inode_getblk(struct inode *inode, struct udf_map_rq *map);
58 static int 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, udf_pblk_t,
61 struct kernel_long_ad *, int *);
62 static void udf_prealloc_extents(struct inode *, int, int,
63 struct kernel_long_ad *, int *);
64 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
65 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
66 int, struct extent_position *);
67 static int udf_get_block_wb(struct inode *inode, sector_t block,
68 struct buffer_head *bh_result, int create);
69
70 static void __udf_clear_extent_cache(struct inode *inode)
71 {
72 struct udf_inode_info *iinfo = UDF_I(inode);
73
74 if (iinfo->cached_extent.lstart != -1) {
75 brelse(iinfo->cached_extent.epos.bh);
76 iinfo->cached_extent.lstart = -1;
77 }
78 }
79
80 /* Invalidate extent cache */
81 static void udf_clear_extent_cache(struct inode *inode)
82 {
83 struct udf_inode_info *iinfo = UDF_I(inode);
84
85 spin_lock(&iinfo->i_extent_cache_lock);
86 __udf_clear_extent_cache(inode);
87 spin_unlock(&iinfo->i_extent_cache_lock);
88 }
89
90 /* Return contents of extent cache */
91 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
92 loff_t *lbcount, struct extent_position *pos)
93 {
94 struct udf_inode_info *iinfo = UDF_I(inode);
95 int ret = 0;
96
97 spin_lock(&iinfo->i_extent_cache_lock);
98 if ((iinfo->cached_extent.lstart <= bcount) &&
99 (iinfo->cached_extent.lstart != -1)) {
100 /* Cache hit */
101 *lbcount = iinfo->cached_extent.lstart;
102 memcpy(pos, &iinfo->cached_extent.epos,
103 sizeof(struct extent_position));
104 if (pos->bh)
105 get_bh(pos->bh);
106 ret = 1;
107 }
108 spin_unlock(&iinfo->i_extent_cache_lock);
109 return ret;
110 }
111
112 /* Add extent to extent cache */
113 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
114 struct extent_position *pos)
115 {
116 struct udf_inode_info *iinfo = UDF_I(inode);
117
118 spin_lock(&iinfo->i_extent_cache_lock);
119 /* Invalidate previously cached extent */
120 __udf_clear_extent_cache(inode);
121 if (pos->bh)
122 get_bh(pos->bh);
123 memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
124 iinfo->cached_extent.lstart = estart;
125 switch (iinfo->i_alloc_type) {
126 case ICBTAG_FLAG_AD_SHORT:
127 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
128 break;
129 case ICBTAG_FLAG_AD_LONG:
130 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
131 break;
132 }
133 spin_unlock(&iinfo->i_extent_cache_lock);
134 }
135
136 void udf_evict_inode(struct inode *inode)
137 {
138 struct udf_inode_info *iinfo = UDF_I(inode);
139 int want_delete = 0;
140
141 if (!is_bad_inode(inode)) {
142 if (!inode->i_nlink) {
143 want_delete = 1;
144 udf_setsize(inode, 0);
145 udf_update_inode(inode, IS_SYNC(inode));
146 }
147 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
148 inode->i_size != iinfo->i_lenExtents) {
149 udf_warn(inode->i_sb,
150 "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
151 inode->i_ino, inode->i_mode,
152 (unsigned long long)inode->i_size,
153 (unsigned long long)iinfo->i_lenExtents);
154 }
155 }
156 truncate_inode_pages_final(&inode->i_data);
157 invalidate_inode_buffers(inode);
158 clear_inode(inode);
159 kfree(iinfo->i_data);
160 iinfo->i_data = NULL;
161 udf_clear_extent_cache(inode);
162 if (want_delete) {
163 udf_free_inode(inode);
164 }
165 }
166
167 static void udf_write_failed(struct address_space *mapping, loff_t to)
168 {
169 struct inode *inode = mapping->host;
170 struct udf_inode_info *iinfo = UDF_I(inode);
171 loff_t isize = inode->i_size;
172
173 if (to > isize) {
174 truncate_pagecache(inode, isize);
175 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
176 down_write(&iinfo->i_data_sem);
177 udf_clear_extent_cache(inode);
178 udf_truncate_extents(inode);
179 up_write(&iinfo->i_data_sem);
180 }
181 }
182 }
183
184 static int udf_adinicb_writepage(struct folio *folio,
185 struct writeback_control *wbc, void *data)
186 {
187 struct inode *inode = folio->mapping->host;
188 struct udf_inode_info *iinfo = UDF_I(inode);
189
190 BUG_ON(!folio_test_locked(folio));
191 BUG_ON(folio->index != 0);
192 memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 0,
193 i_size_read(inode));
194 folio_unlock(folio);
195 mark_inode_dirty(inode);
196
197 return 0;
198 }
199
200 static int udf_writepages(struct address_space *mapping,
201 struct writeback_control *wbc)
202 {
203 struct inode *inode = mapping->host;
204 struct udf_inode_info *iinfo = UDF_I(inode);
205
206 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
207 return mpage_writepages(mapping, wbc, udf_get_block_wb);
208 return write_cache_pages(mapping, wbc, udf_adinicb_writepage, NULL);
209 }
210
211 static void udf_adinicb_read_folio(struct folio *folio)
212 {
213 struct inode *inode = folio->mapping->host;
214 struct udf_inode_info *iinfo = UDF_I(inode);
215 loff_t isize = i_size_read(inode);
216
217 folio_fill_tail(folio, 0, iinfo->i_data + iinfo->i_lenEAttr, isize);
218 folio_mark_uptodate(folio);
219 }
220
221 static int udf_read_folio(struct file *file, struct folio *folio)
222 {
223 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
224
225 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
226 udf_adinicb_read_folio(folio);
227 folio_unlock(folio);
228 return 0;
229 }
230 return mpage_read_folio(folio, udf_get_block);
231 }
232
233 static void udf_readahead(struct readahead_control *rac)
234 {
235 struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
236
237 /*
238 * No readahead needed for in-ICB files and udf_get_block() would get
239 * confused for such file anyway.
240 */
241 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
242 return;
243
244 mpage_readahead(rac, udf_get_block);
245 }
246
247 static int udf_write_begin(struct file *file, struct address_space *mapping,
248 loff_t pos, unsigned len,
249 struct page **pagep, void **fsdata)
250 {
251 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
252 struct folio *folio;
253 int ret;
254
255 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
256 ret = block_write_begin(mapping, pos, len, pagep,
257 udf_get_block);
258 if (unlikely(ret))
259 udf_write_failed(mapping, pos + len);
260 return ret;
261 }
262 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
263 return -EIO;
264 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
265 mapping_gfp_mask(mapping));
266 if (IS_ERR(folio))
267 return PTR_ERR(folio);
268 *pagep = &folio->page;
269 if (!folio_test_uptodate(folio))
270 udf_adinicb_read_folio(folio);
271 return 0;
272 }
273
274 static int udf_write_end(struct file *file, struct address_space *mapping,
275 loff_t pos, unsigned len, unsigned copied,
276 struct page *page, void *fsdata)
277 {
278 struct inode *inode = file_inode(file);
279 struct folio *folio;
280 loff_t last_pos;
281
282 if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
283 return generic_write_end(file, mapping, pos, len, copied, page,
284 fsdata);
285 folio = page_folio(page);
286 last_pos = pos + copied;
287 if (last_pos > inode->i_size)
288 i_size_write(inode, last_pos);
289 folio_mark_dirty(folio);
290 folio_unlock(folio);
291 folio_put(folio);
292
293 return copied;
294 }
295
296 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
297 {
298 struct file *file = iocb->ki_filp;
299 struct address_space *mapping = file->f_mapping;
300 struct inode *inode = mapping->host;
301 size_t count = iov_iter_count(iter);
302 ssize_t ret;
303
304 /* Fallback to buffered IO for in-ICB files */
305 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
306 return 0;
307 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
308 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
309 udf_write_failed(mapping, iocb->ki_pos + count);
310 return ret;
311 }
312
313 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
314 {
315 struct udf_inode_info *iinfo = UDF_I(mapping->host);
316
317 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
318 return -EINVAL;
319 return generic_block_bmap(mapping, block, udf_get_block);
320 }
321
322 const struct address_space_operations udf_aops = {
323 .dirty_folio = block_dirty_folio,
324 .invalidate_folio = block_invalidate_folio,
325 .read_folio = udf_read_folio,
326 .readahead = udf_readahead,
327 .writepages = udf_writepages,
328 .write_begin = udf_write_begin,
329 .write_end = udf_write_end,
330 .direct_IO = udf_direct_IO,
331 .bmap = udf_bmap,
332 .migrate_folio = buffer_migrate_folio,
333 };
334
335 /*
336 * Expand file stored in ICB to a normal one-block-file
337 *
338 * This function requires i_mutex held
339 */
340 int udf_expand_file_adinicb(struct inode *inode)
341 {
342 struct folio *folio;
343 struct udf_inode_info *iinfo = UDF_I(inode);
344 int err;
345
346 WARN_ON_ONCE(!inode_is_locked(inode));
347 if (!iinfo->i_lenAlloc) {
348 down_write(&iinfo->i_data_sem);
349 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
350 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
351 else
352 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
353 up_write(&iinfo->i_data_sem);
354 mark_inode_dirty(inode);
355 return 0;
356 }
357
358 folio = __filemap_get_folio(inode->i_mapping, 0,
359 FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL);
360 if (IS_ERR(folio))
361 return PTR_ERR(folio);
362
363 if (!folio_test_uptodate(folio))
364 udf_adinicb_read_folio(folio);
365 down_write(&iinfo->i_data_sem);
366 memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
367 iinfo->i_lenAlloc);
368 iinfo->i_lenAlloc = 0;
369 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
370 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
371 else
372 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
373 folio_mark_dirty(folio);
374 folio_unlock(folio);
375 up_write(&iinfo->i_data_sem);
376 err = filemap_fdatawrite(inode->i_mapping);
377 if (err) {
378 /* Restore everything back so that we don't lose data... */
379 folio_lock(folio);
380 down_write(&iinfo->i_data_sem);
381 memcpy_from_folio(iinfo->i_data + iinfo->i_lenEAttr,
382 folio, 0, inode->i_size);
383 folio_unlock(folio);
384 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
385 iinfo->i_lenAlloc = inode->i_size;
386 up_write(&iinfo->i_data_sem);
387 }
388 folio_put(folio);
389 mark_inode_dirty(inode);
390
391 return err;
392 }
393
394 #define UDF_MAP_CREATE 0x01 /* Mapping can allocate new blocks */
395 #define UDF_MAP_NOPREALLOC 0x02 /* Do not preallocate blocks */
396
397 #define UDF_BLK_MAPPED 0x01 /* Block was successfully mapped */
398 #define UDF_BLK_NEW 0x02 /* Block was freshly allocated */
399
400 struct udf_map_rq {
401 sector_t lblk;
402 udf_pblk_t pblk;
403 int iflags; /* UDF_MAP_ flags determining behavior */
404 int oflags; /* UDF_BLK_ flags reporting results */
405 };
406
407 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
408 {
409 int err;
410 struct udf_inode_info *iinfo = UDF_I(inode);
411
412 if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
413 return -EFSCORRUPTED;
414
415 map->oflags = 0;
416 if (!(map->iflags & UDF_MAP_CREATE)) {
417 struct kernel_lb_addr eloc;
418 uint32_t elen;
419 sector_t offset;
420 struct extent_position epos = {};
421
422 down_read(&iinfo->i_data_sem);
423 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
424 == (EXT_RECORDED_ALLOCATED >> 30)) {
425 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
426 offset);
427 map->oflags |= UDF_BLK_MAPPED;
428 }
429 up_read(&iinfo->i_data_sem);
430 brelse(epos.bh);
431
432 return 0;
433 }
434
435 down_write(&iinfo->i_data_sem);
436 /*
437 * Block beyond EOF and prealloc extents? Just discard preallocation
438 * as it is not useful and complicates things.
439 */
440 if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
441 udf_discard_prealloc(inode);
442 udf_clear_extent_cache(inode);
443 err = inode_getblk(inode, map);
444 up_write(&iinfo->i_data_sem);
445 return err;
446 }
447
448 static int __udf_get_block(struct inode *inode, sector_t block,
449 struct buffer_head *bh_result, int flags)
450 {
451 int err;
452 struct udf_map_rq map = {
453 .lblk = block,
454 .iflags = flags,
455 };
456
457 err = udf_map_block(inode, &map);
458 if (err < 0)
459 return err;
460 if (map.oflags & UDF_BLK_MAPPED) {
461 map_bh(bh_result, inode->i_sb, map.pblk);
462 if (map.oflags & UDF_BLK_NEW)
463 set_buffer_new(bh_result);
464 }
465 return 0;
466 }
467
468 int udf_get_block(struct inode *inode, sector_t block,
469 struct buffer_head *bh_result, int create)
470 {
471 int flags = create ? UDF_MAP_CREATE : 0;
472
473 /*
474 * We preallocate blocks only for regular files. It also makes sense
475 * for directories but there's a problem when to drop the
476 * preallocation. We might use some delayed work for that but I feel
477 * it's overengineering for a filesystem like UDF.
478 */
479 if (!S_ISREG(inode->i_mode))
480 flags |= UDF_MAP_NOPREALLOC;
481 return __udf_get_block(inode, block, bh_result, flags);
482 }
483
484 /*
485 * We shouldn't be allocating blocks on page writeback since we allocate them
486 * on page fault. We can spot dirty buffers without allocated blocks though
487 * when truncate expands file. These however don't have valid data so we can
488 * safely ignore them. So never allocate blocks from page writeback.
489 */
490 static int udf_get_block_wb(struct inode *inode, sector_t block,
491 struct buffer_head *bh_result, int create)
492 {
493 return __udf_get_block(inode, block, bh_result, 0);
494 }
495
496 /* Extend the file with new blocks totaling 'new_block_bytes',
497 * return the number of extents added
498 */
499 static int udf_do_extend_file(struct inode *inode,
500 struct extent_position *last_pos,
501 struct kernel_long_ad *last_ext,
502 loff_t new_block_bytes)
503 {
504 uint32_t add;
505 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
506 struct super_block *sb = inode->i_sb;
507 struct udf_inode_info *iinfo;
508 int err;
509
510 /* The previous extent is fake and we should not extend by anything
511 * - there's nothing to do... */
512 if (!new_block_bytes && fake)
513 return 0;
514
515 iinfo = UDF_I(inode);
516 /* Round the last extent up to a multiple of block size */
517 if (last_ext->extLength & (sb->s_blocksize - 1)) {
518 last_ext->extLength =
519 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
520 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
521 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
522 iinfo->i_lenExtents =
523 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
524 ~(sb->s_blocksize - 1);
525 }
526
527 add = 0;
528 /* Can we merge with the previous extent? */
529 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
530 EXT_NOT_RECORDED_NOT_ALLOCATED) {
531 add = (1 << 30) - sb->s_blocksize -
532 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
533 if (add > new_block_bytes)
534 add = new_block_bytes;
535 new_block_bytes -= add;
536 last_ext->extLength += add;
537 }
538
539 if (fake) {
540 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
541 last_ext->extLength, 1);
542 if (err < 0)
543 goto out_err;
544 count++;
545 } else {
546 struct kernel_lb_addr tmploc;
547 uint32_t tmplen;
548
549 udf_write_aext(inode, last_pos, &last_ext->extLocation,
550 last_ext->extLength, 1);
551
552 /*
553 * We've rewritten the last extent. If we are going to add
554 * more extents, we may need to enter possible following
555 * empty indirect extent.
556 */
557 if (new_block_bytes)
558 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
559 }
560 iinfo->i_lenExtents += add;
561
562 /* Managed to do everything necessary? */
563 if (!new_block_bytes)
564 goto out;
565
566 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
567 last_ext->extLocation.logicalBlockNum = 0;
568 last_ext->extLocation.partitionReferenceNum = 0;
569 add = (1 << 30) - sb->s_blocksize;
570 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
571
572 /* Create enough extents to cover the whole hole */
573 while (new_block_bytes > add) {
574 new_block_bytes -= add;
575 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
576 last_ext->extLength, 1);
577 if (err)
578 goto out_err;
579 iinfo->i_lenExtents += add;
580 count++;
581 }
582 if (new_block_bytes) {
583 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
584 new_block_bytes;
585 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
586 last_ext->extLength, 1);
587 if (err)
588 goto out_err;
589 iinfo->i_lenExtents += new_block_bytes;
590 count++;
591 }
592
593 out:
594 /* last_pos should point to the last written extent... */
595 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
596 last_pos->offset -= sizeof(struct short_ad);
597 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
598 last_pos->offset -= sizeof(struct long_ad);
599 else
600 return -EIO;
601
602 return count;
603 out_err:
604 /* Remove extents we've created so far */
605 udf_clear_extent_cache(inode);
606 udf_truncate_extents(inode);
607 return err;
608 }
609
610 /* Extend the final block of the file to final_block_len bytes */
611 static void udf_do_extend_final_block(struct inode *inode,
612 struct extent_position *last_pos,
613 struct kernel_long_ad *last_ext,
614 uint32_t new_elen)
615 {
616 uint32_t added_bytes;
617
618 /*
619 * Extent already large enough? It may be already rounded up to block
620 * size...
621 */
622 if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
623 return;
624 added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
625 last_ext->extLength += added_bytes;
626 UDF_I(inode)->i_lenExtents += added_bytes;
627
628 udf_write_aext(inode, last_pos, &last_ext->extLocation,
629 last_ext->extLength, 1);
630 }
631
632 static int udf_extend_file(struct inode *inode, loff_t newsize)
633 {
634
635 struct extent_position epos;
636 struct kernel_lb_addr eloc;
637 uint32_t elen;
638 int8_t etype;
639 struct super_block *sb = inode->i_sb;
640 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
641 loff_t new_elen;
642 int adsize;
643 struct udf_inode_info *iinfo = UDF_I(inode);
644 struct kernel_long_ad extent;
645 int err = 0;
646 bool within_last_ext;
647
648 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
649 adsize = sizeof(struct short_ad);
650 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
651 adsize = sizeof(struct long_ad);
652 else
653 BUG();
654
655 down_write(&iinfo->i_data_sem);
656 /*
657 * When creating hole in file, just don't bother with preserving
658 * preallocation. It likely won't be very useful anyway.
659 */
660 udf_discard_prealloc(inode);
661
662 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
663 within_last_ext = (etype != -1);
664 /* We don't expect extents past EOF... */
665 WARN_ON_ONCE(within_last_ext &&
666 elen > ((loff_t)offset + 1) << inode->i_blkbits);
667
668 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
669 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
670 /* File has no extents at all or has empty last
671 * indirect extent! Create a fake extent... */
672 extent.extLocation.logicalBlockNum = 0;
673 extent.extLocation.partitionReferenceNum = 0;
674 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
675 } else {
676 epos.offset -= adsize;
677 etype = udf_next_aext(inode, &epos, &extent.extLocation,
678 &extent.extLength, 0);
679 extent.extLength |= etype << 30;
680 }
681
682 new_elen = ((loff_t)offset << inode->i_blkbits) |
683 (newsize & (sb->s_blocksize - 1));
684
685 /* File has extent covering the new size (could happen when extending
686 * inside a block)?
687 */
688 if (within_last_ext) {
689 /* Extending file within the last file block */
690 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
691 } else {
692 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
693 }
694
695 if (err < 0)
696 goto out;
697 err = 0;
698 out:
699 brelse(epos.bh);
700 up_write(&iinfo->i_data_sem);
701 return err;
702 }
703
704 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
705 {
706 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
707 struct extent_position prev_epos, cur_epos, next_epos;
708 int count = 0, startnum = 0, endnum = 0;
709 uint32_t elen = 0, tmpelen;
710 struct kernel_lb_addr eloc, tmpeloc;
711 int c = 1;
712 loff_t lbcount = 0, b_off = 0;
713 udf_pblk_t newblocknum;
714 sector_t offset = 0;
715 int8_t etype;
716 struct udf_inode_info *iinfo = UDF_I(inode);
717 udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
718 int lastblock = 0;
719 bool isBeyondEOF;
720 int ret = 0;
721
722 prev_epos.offset = udf_file_entry_alloc_offset(inode);
723 prev_epos.block = iinfo->i_location;
724 prev_epos.bh = NULL;
725 cur_epos = next_epos = prev_epos;
726 b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
727
728 /* find the extent which contains the block we are looking for.
729 alternate between laarr[0] and laarr[1] for locations of the
730 current extent, and the previous extent */
731 do {
732 if (prev_epos.bh != cur_epos.bh) {
733 brelse(prev_epos.bh);
734 get_bh(cur_epos.bh);
735 prev_epos.bh = cur_epos.bh;
736 }
737 if (cur_epos.bh != next_epos.bh) {
738 brelse(cur_epos.bh);
739 get_bh(next_epos.bh);
740 cur_epos.bh = next_epos.bh;
741 }
742
743 lbcount += elen;
744
745 prev_epos.block = cur_epos.block;
746 cur_epos.block = next_epos.block;
747
748 prev_epos.offset = cur_epos.offset;
749 cur_epos.offset = next_epos.offset;
750
751 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
752 if (etype == -1)
753 break;
754
755 c = !c;
756
757 laarr[c].extLength = (etype << 30) | elen;
758 laarr[c].extLocation = eloc;
759
760 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
761 pgoal = eloc.logicalBlockNum +
762 ((elen + inode->i_sb->s_blocksize - 1) >>
763 inode->i_sb->s_blocksize_bits);
764
765 count++;
766 } while (lbcount + elen <= b_off);
767
768 b_off -= lbcount;
769 offset = b_off >> inode->i_sb->s_blocksize_bits;
770 /*
771 * Move prev_epos and cur_epos into indirect extent if we are at
772 * the pointer to it
773 */
774 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
775 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
776
777 /* if the extent is allocated and recorded, return the block
778 if the extent is not a multiple of the blocksize, round up */
779
780 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
781 if (elen & (inode->i_sb->s_blocksize - 1)) {
782 elen = EXT_RECORDED_ALLOCATED |
783 ((elen + inode->i_sb->s_blocksize - 1) &
784 ~(inode->i_sb->s_blocksize - 1));
785 iinfo->i_lenExtents =
786 ALIGN(iinfo->i_lenExtents,
787 inode->i_sb->s_blocksize);
788 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
789 }
790 map->oflags = UDF_BLK_MAPPED;
791 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
792 goto out_free;
793 }
794
795 /* Are we beyond EOF and preallocated extent? */
796 if (etype == -1) {
797 loff_t hole_len;
798
799 isBeyondEOF = true;
800 if (count) {
801 if (c)
802 laarr[0] = laarr[1];
803 startnum = 1;
804 } else {
805 /* Create a fake extent when there's not one */
806 memset(&laarr[0].extLocation, 0x00,
807 sizeof(struct kernel_lb_addr));
808 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
809 /* Will udf_do_extend_file() create real extent from
810 a fake one? */
811 startnum = (offset > 0);
812 }
813 /* Create extents for the hole between EOF and offset */
814 hole_len = (loff_t)offset << inode->i_blkbits;
815 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
816 if (ret < 0)
817 goto out_free;
818 c = 0;
819 offset = 0;
820 count += ret;
821 /*
822 * Is there any real extent? - otherwise we overwrite the fake
823 * one...
824 */
825 if (count)
826 c = !c;
827 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
828 inode->i_sb->s_blocksize;
829 memset(&laarr[c].extLocation, 0x00,
830 sizeof(struct kernel_lb_addr));
831 count++;
832 endnum = c + 1;
833 lastblock = 1;
834 } else {
835 isBeyondEOF = false;
836 endnum = startnum = ((count > 2) ? 2 : count);
837
838 /* if the current extent is in position 0,
839 swap it with the previous */
840 if (!c && count != 1) {
841 laarr[2] = laarr[0];
842 laarr[0] = laarr[1];
843 laarr[1] = laarr[2];
844 c = 1;
845 }
846
847 /* if the current block is located in an extent,
848 read the next extent */
849 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
850 if (etype != -1) {
851 laarr[c + 1].extLength = (etype << 30) | elen;
852 laarr[c + 1].extLocation = eloc;
853 count++;
854 startnum++;
855 endnum++;
856 } else
857 lastblock = 1;
858 }
859
860 /* if the current extent is not recorded but allocated, get the
861 * block in the extent corresponding to the requested block */
862 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
863 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
864 else { /* otherwise, allocate a new block */
865 if (iinfo->i_next_alloc_block == map->lblk)
866 goal = iinfo->i_next_alloc_goal;
867
868 if (!goal) {
869 if (!(goal = pgoal)) /* XXX: what was intended here? */
870 goal = iinfo->i_location.logicalBlockNum + 1;
871 }
872
873 newblocknum = udf_new_block(inode->i_sb, inode,
874 iinfo->i_location.partitionReferenceNum,
875 goal, &ret);
876 if (!newblocknum)
877 goto out_free;
878 if (isBeyondEOF)
879 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
880 }
881
882 /* if the extent the requsted block is located in contains multiple
883 * blocks, split the extent into at most three extents. blocks prior
884 * to requested block, requested block, and blocks after requested
885 * block */
886 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
887
888 if (!(map->iflags & UDF_MAP_NOPREALLOC))
889 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
890
891 /* merge any continuous blocks in laarr */
892 udf_merge_extents(inode, laarr, &endnum);
893
894 /* write back the new extents, inserting new extents if the new number
895 * of extents is greater than the old number, and deleting extents if
896 * the new number of extents is less than the old number */
897 ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
898 if (ret < 0)
899 goto out_free;
900
901 map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
902 iinfo->i_location.partitionReferenceNum, 0);
903 if (!map->pblk) {
904 ret = -EFSCORRUPTED;
905 goto out_free;
906 }
907 map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
908 iinfo->i_next_alloc_block = map->lblk + 1;
909 iinfo->i_next_alloc_goal = newblocknum + 1;
910 inode_set_ctime_current(inode);
911
912 if (IS_SYNC(inode))
913 udf_sync_inode(inode);
914 else
915 mark_inode_dirty(inode);
916 ret = 0;
917 out_free:
918 brelse(prev_epos.bh);
919 brelse(cur_epos.bh);
920 brelse(next_epos.bh);
921 return ret;
922 }
923
924 static void udf_split_extents(struct inode *inode, int *c, int offset,
925 udf_pblk_t newblocknum,
926 struct kernel_long_ad *laarr, int *endnum)
927 {
928 unsigned long blocksize = inode->i_sb->s_blocksize;
929 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
930
931 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
932 (laarr[*c].extLength >> 30) ==
933 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
934 int curr = *c;
935 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
936 blocksize - 1) >> blocksize_bits;
937 int8_t etype = (laarr[curr].extLength >> 30);
938
939 if (blen == 1)
940 ;
941 else if (!offset || blen == offset + 1) {
942 laarr[curr + 2] = laarr[curr + 1];
943 laarr[curr + 1] = laarr[curr];
944 } else {
945 laarr[curr + 3] = laarr[curr + 1];
946 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
947 }
948
949 if (offset) {
950 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
951 udf_free_blocks(inode->i_sb, inode,
952 &laarr[curr].extLocation,
953 0, offset);
954 laarr[curr].extLength =
955 EXT_NOT_RECORDED_NOT_ALLOCATED |
956 (offset << blocksize_bits);
957 laarr[curr].extLocation.logicalBlockNum = 0;
958 laarr[curr].extLocation.
959 partitionReferenceNum = 0;
960 } else
961 laarr[curr].extLength = (etype << 30) |
962 (offset << blocksize_bits);
963 curr++;
964 (*c)++;
965 (*endnum)++;
966 }
967
968 laarr[curr].extLocation.logicalBlockNum = newblocknum;
969 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
970 laarr[curr].extLocation.partitionReferenceNum =
971 UDF_I(inode)->i_location.partitionReferenceNum;
972 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
973 blocksize;
974 curr++;
975
976 if (blen != offset + 1) {
977 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
978 laarr[curr].extLocation.logicalBlockNum +=
979 offset + 1;
980 laarr[curr].extLength = (etype << 30) |
981 ((blen - (offset + 1)) << blocksize_bits);
982 curr++;
983 (*endnum)++;
984 }
985 }
986 }
987
988 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
989 struct kernel_long_ad *laarr,
990 int *endnum)
991 {
992 int start, length = 0, currlength = 0, i;
993
994 if (*endnum >= (c + 1)) {
995 if (!lastblock)
996 return;
997 else
998 start = c;
999 } else {
1000 if ((laarr[c + 1].extLength >> 30) ==
1001 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1002 start = c + 1;
1003 length = currlength =
1004 (((laarr[c + 1].extLength &
1005 UDF_EXTENT_LENGTH_MASK) +
1006 inode->i_sb->s_blocksize - 1) >>
1007 inode->i_sb->s_blocksize_bits);
1008 } else
1009 start = c;
1010 }
1011
1012 for (i = start + 1; i <= *endnum; i++) {
1013 if (i == *endnum) {
1014 if (lastblock)
1015 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1016 } else if ((laarr[i].extLength >> 30) ==
1017 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1018 length += (((laarr[i].extLength &
1019 UDF_EXTENT_LENGTH_MASK) +
1020 inode->i_sb->s_blocksize - 1) >>
1021 inode->i_sb->s_blocksize_bits);
1022 } else
1023 break;
1024 }
1025
1026 if (length) {
1027 int next = laarr[start].extLocation.logicalBlockNum +
1028 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1029 inode->i_sb->s_blocksize - 1) >>
1030 inode->i_sb->s_blocksize_bits);
1031 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1032 laarr[start].extLocation.partitionReferenceNum,
1033 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1034 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1035 currlength);
1036 if (numalloc) {
1037 if (start == (c + 1))
1038 laarr[start].extLength +=
1039 (numalloc <<
1040 inode->i_sb->s_blocksize_bits);
1041 else {
1042 memmove(&laarr[c + 2], &laarr[c + 1],
1043 sizeof(struct long_ad) * (*endnum - (c + 1)));
1044 (*endnum)++;
1045 laarr[c + 1].extLocation.logicalBlockNum = next;
1046 laarr[c + 1].extLocation.partitionReferenceNum =
1047 laarr[c].extLocation.
1048 partitionReferenceNum;
1049 laarr[c + 1].extLength =
1050 EXT_NOT_RECORDED_ALLOCATED |
1051 (numalloc <<
1052 inode->i_sb->s_blocksize_bits);
1053 start = c + 1;
1054 }
1055
1056 for (i = start + 1; numalloc && i < *endnum; i++) {
1057 int elen = ((laarr[i].extLength &
1058 UDF_EXTENT_LENGTH_MASK) +
1059 inode->i_sb->s_blocksize - 1) >>
1060 inode->i_sb->s_blocksize_bits;
1061
1062 if (elen > numalloc) {
1063 laarr[i].extLength -=
1064 (numalloc <<
1065 inode->i_sb->s_blocksize_bits);
1066 numalloc = 0;
1067 } else {
1068 numalloc -= elen;
1069 if (*endnum > (i + 1))
1070 memmove(&laarr[i],
1071 &laarr[i + 1],
1072 sizeof(struct long_ad) *
1073 (*endnum - (i + 1)));
1074 i--;
1075 (*endnum)--;
1076 }
1077 }
1078 UDF_I(inode)->i_lenExtents +=
1079 numalloc << inode->i_sb->s_blocksize_bits;
1080 }
1081 }
1082 }
1083
1084 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1085 int *endnum)
1086 {
1087 int i;
1088 unsigned long blocksize = inode->i_sb->s_blocksize;
1089 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1090
1091 for (i = 0; i < (*endnum - 1); i++) {
1092 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1093 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1094
1095 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1096 (((li->extLength >> 30) ==
1097 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1098 ((lip1->extLocation.logicalBlockNum -
1099 li->extLocation.logicalBlockNum) ==
1100 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1101 blocksize - 1) >> blocksize_bits)))) {
1102
1103 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1104 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1105 blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1106 li->extLength = lip1->extLength +
1107 (((li->extLength &
1108 UDF_EXTENT_LENGTH_MASK) +
1109 blocksize - 1) & ~(blocksize - 1));
1110 if (*endnum > (i + 2))
1111 memmove(&laarr[i + 1], &laarr[i + 2],
1112 sizeof(struct long_ad) *
1113 (*endnum - (i + 2)));
1114 i--;
1115 (*endnum)--;
1116 }
1117 } else if (((li->extLength >> 30) ==
1118 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1119 ((lip1->extLength >> 30) ==
1120 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1121 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1122 ((li->extLength &
1123 UDF_EXTENT_LENGTH_MASK) +
1124 blocksize - 1) >> blocksize_bits);
1125 li->extLocation.logicalBlockNum = 0;
1126 li->extLocation.partitionReferenceNum = 0;
1127
1128 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1129 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1130 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1131 lip1->extLength = (lip1->extLength -
1132 (li->extLength &
1133 UDF_EXTENT_LENGTH_MASK) +
1134 UDF_EXTENT_LENGTH_MASK) &
1135 ~(blocksize - 1);
1136 li->extLength = (li->extLength &
1137 UDF_EXTENT_FLAG_MASK) +
1138 (UDF_EXTENT_LENGTH_MASK + 1) -
1139 blocksize;
1140 } else {
1141 li->extLength = lip1->extLength +
1142 (((li->extLength &
1143 UDF_EXTENT_LENGTH_MASK) +
1144 blocksize - 1) & ~(blocksize - 1));
1145 if (*endnum > (i + 2))
1146 memmove(&laarr[i + 1], &laarr[i + 2],
1147 sizeof(struct long_ad) *
1148 (*endnum - (i + 2)));
1149 i--;
1150 (*endnum)--;
1151 }
1152 } else if ((li->extLength >> 30) ==
1153 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1154 udf_free_blocks(inode->i_sb, inode,
1155 &li->extLocation, 0,
1156 ((li->extLength &
1157 UDF_EXTENT_LENGTH_MASK) +
1158 blocksize - 1) >> blocksize_bits);
1159 li->extLocation.logicalBlockNum = 0;
1160 li->extLocation.partitionReferenceNum = 0;
1161 li->extLength = (li->extLength &
1162 UDF_EXTENT_LENGTH_MASK) |
1163 EXT_NOT_RECORDED_NOT_ALLOCATED;
1164 }
1165 }
1166 }
1167
1168 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1169 int startnum, int endnum,
1170 struct extent_position *epos)
1171 {
1172 int start = 0, i;
1173 struct kernel_lb_addr tmploc;
1174 uint32_t tmplen;
1175 int err;
1176
1177 if (startnum > endnum) {
1178 for (i = 0; i < (startnum - endnum); i++)
1179 udf_delete_aext(inode, *epos);
1180 } else if (startnum < endnum) {
1181 for (i = 0; i < (endnum - startnum); i++) {
1182 err = udf_insert_aext(inode, *epos,
1183 laarr[i].extLocation,
1184 laarr[i].extLength);
1185 /*
1186 * If we fail here, we are likely corrupting the extent
1187 * list and leaking blocks. At least stop early to
1188 * limit the damage.
1189 */
1190 if (err < 0)
1191 return err;
1192 udf_next_aext(inode, epos, &laarr[i].extLocation,
1193 &laarr[i].extLength, 1);
1194 start++;
1195 }
1196 }
1197
1198 for (i = start; i < endnum; i++) {
1199 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1200 udf_write_aext(inode, epos, &laarr[i].extLocation,
1201 laarr[i].extLength, 1);
1202 }
1203 return 0;
1204 }
1205
1206 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1207 int create, int *err)
1208 {
1209 struct buffer_head *bh = NULL;
1210 struct udf_map_rq map = {
1211 .lblk = block,
1212 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1213 };
1214
1215 *err = udf_map_block(inode, &map);
1216 if (*err || !(map.oflags & UDF_BLK_MAPPED))
1217 return NULL;
1218
1219 bh = sb_getblk(inode->i_sb, map.pblk);
1220 if (!bh) {
1221 *err = -ENOMEM;
1222 return NULL;
1223 }
1224 if (map.oflags & UDF_BLK_NEW) {
1225 lock_buffer(bh);
1226 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1227 set_buffer_uptodate(bh);
1228 unlock_buffer(bh);
1229 mark_buffer_dirty_inode(bh, inode);
1230 return bh;
1231 }
1232
1233 if (bh_read(bh, 0) >= 0)
1234 return bh;
1235
1236 brelse(bh);
1237 *err = -EIO;
1238 return NULL;
1239 }
1240
1241 int udf_setsize(struct inode *inode, loff_t newsize)
1242 {
1243 int err = 0;
1244 struct udf_inode_info *iinfo;
1245 unsigned int bsize = i_blocksize(inode);
1246
1247 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1248 S_ISLNK(inode->i_mode)))
1249 return -EINVAL;
1250
1251 iinfo = UDF_I(inode);
1252 if (newsize > inode->i_size) {
1253 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1254 if (bsize >=
1255 (udf_file_entry_alloc_offset(inode) + newsize)) {
1256 down_write(&iinfo->i_data_sem);
1257 iinfo->i_lenAlloc = newsize;
1258 up_write(&iinfo->i_data_sem);
1259 goto set_size;
1260 }
1261 err = udf_expand_file_adinicb(inode);
1262 if (err)
1263 return err;
1264 }
1265 err = udf_extend_file(inode, newsize);
1266 if (err)
1267 return err;
1268 set_size:
1269 truncate_setsize(inode, newsize);
1270 } else {
1271 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1272 down_write(&iinfo->i_data_sem);
1273 udf_clear_extent_cache(inode);
1274 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1275 0x00, bsize - newsize -
1276 udf_file_entry_alloc_offset(inode));
1277 iinfo->i_lenAlloc = newsize;
1278 truncate_setsize(inode, newsize);
1279 up_write(&iinfo->i_data_sem);
1280 goto update_time;
1281 }
1282 err = block_truncate_page(inode->i_mapping, newsize,
1283 udf_get_block);
1284 if (err)
1285 return err;
1286 truncate_setsize(inode, newsize);
1287 down_write(&iinfo->i_data_sem);
1288 udf_clear_extent_cache(inode);
1289 err = udf_truncate_extents(inode);
1290 up_write(&iinfo->i_data_sem);
1291 if (err)
1292 return err;
1293 }
1294 update_time:
1295 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1296 if (IS_SYNC(inode))
1297 udf_sync_inode(inode);
1298 else
1299 mark_inode_dirty(inode);
1300 return err;
1301 }
1302
1303 /*
1304 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1305 * arbitrary - just that we hopefully don't limit any real use of rewritten
1306 * inode on write-once media but avoid looping for too long on corrupted media.
1307 */
1308 #define UDF_MAX_ICB_NESTING 1024
1309
1310 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1311 {
1312 struct buffer_head *bh = NULL;
1313 struct fileEntry *fe;
1314 struct extendedFileEntry *efe;
1315 uint16_t ident;
1316 struct udf_inode_info *iinfo = UDF_I(inode);
1317 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1318 struct kernel_lb_addr *iloc = &iinfo->i_location;
1319 unsigned int link_count;
1320 unsigned int indirections = 0;
1321 int bs = inode->i_sb->s_blocksize;
1322 int ret = -EIO;
1323 uint32_t uid, gid;
1324 struct timespec64 ts;
1325
1326 reread:
1327 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1328 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1329 iloc->partitionReferenceNum, sbi->s_partitions);
1330 return -EIO;
1331 }
1332
1333 if (iloc->logicalBlockNum >=
1334 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1335 udf_debug("block=%u, partition=%u out of range\n",
1336 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1337 return -EIO;
1338 }
1339
1340 /*
1341 * Set defaults, but the inode is still incomplete!
1342 * Note: get_new_inode() sets the following on a new inode:
1343 * i_sb = sb
1344 * i_no = ino
1345 * i_flags = sb->s_flags
1346 * i_state = 0
1347 * clean_inode(): zero fills and sets
1348 * i_count = 1
1349 * i_nlink = 1
1350 * i_op = NULL;
1351 */
1352 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1353 if (!bh) {
1354 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1355 return -EIO;
1356 }
1357
1358 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1359 ident != TAG_IDENT_USE) {
1360 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1361 inode->i_ino, ident);
1362 goto out;
1363 }
1364
1365 fe = (struct fileEntry *)bh->b_data;
1366 efe = (struct extendedFileEntry *)bh->b_data;
1367
1368 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1369 struct buffer_head *ibh;
1370
1371 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1372 if (ident == TAG_IDENT_IE && ibh) {
1373 struct kernel_lb_addr loc;
1374 struct indirectEntry *ie;
1375
1376 ie = (struct indirectEntry *)ibh->b_data;
1377 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1378
1379 if (ie->indirectICB.extLength) {
1380 brelse(ibh);
1381 memcpy(&iinfo->i_location, &loc,
1382 sizeof(struct kernel_lb_addr));
1383 if (++indirections > UDF_MAX_ICB_NESTING) {
1384 udf_err(inode->i_sb,
1385 "too many ICBs in ICB hierarchy"
1386 " (max %d supported)\n",
1387 UDF_MAX_ICB_NESTING);
1388 goto out;
1389 }
1390 brelse(bh);
1391 goto reread;
1392 }
1393 }
1394 brelse(ibh);
1395 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1396 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1397 le16_to_cpu(fe->icbTag.strategyType));
1398 goto out;
1399 }
1400 if (fe->icbTag.strategyType == cpu_to_le16(4))
1401 iinfo->i_strat4096 = 0;
1402 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1403 iinfo->i_strat4096 = 1;
1404
1405 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1406 ICBTAG_FLAG_AD_MASK;
1407 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1408 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1409 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1410 ret = -EIO;
1411 goto out;
1412 }
1413 iinfo->i_hidden = hidden_inode;
1414 iinfo->i_unique = 0;
1415 iinfo->i_lenEAttr = 0;
1416 iinfo->i_lenExtents = 0;
1417 iinfo->i_lenAlloc = 0;
1418 iinfo->i_next_alloc_block = 0;
1419 iinfo->i_next_alloc_goal = 0;
1420 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1421 iinfo->i_efe = 1;
1422 iinfo->i_use = 0;
1423 ret = udf_alloc_i_data(inode, bs -
1424 sizeof(struct extendedFileEntry));
1425 if (ret)
1426 goto out;
1427 memcpy(iinfo->i_data,
1428 bh->b_data + sizeof(struct extendedFileEntry),
1429 bs - sizeof(struct extendedFileEntry));
1430 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1431 iinfo->i_efe = 0;
1432 iinfo->i_use = 0;
1433 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1434 if (ret)
1435 goto out;
1436 memcpy(iinfo->i_data,
1437 bh->b_data + sizeof(struct fileEntry),
1438 bs - sizeof(struct fileEntry));
1439 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1440 iinfo->i_efe = 0;
1441 iinfo->i_use = 1;
1442 iinfo->i_lenAlloc = le32_to_cpu(
1443 ((struct unallocSpaceEntry *)bh->b_data)->
1444 lengthAllocDescs);
1445 ret = udf_alloc_i_data(inode, bs -
1446 sizeof(struct unallocSpaceEntry));
1447 if (ret)
1448 goto out;
1449 memcpy(iinfo->i_data,
1450 bh->b_data + sizeof(struct unallocSpaceEntry),
1451 bs - sizeof(struct unallocSpaceEntry));
1452 return 0;
1453 }
1454
1455 ret = -EIO;
1456 read_lock(&sbi->s_cred_lock);
1457 uid = le32_to_cpu(fe->uid);
1458 if (uid == UDF_INVALID_ID ||
1459 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1460 inode->i_uid = sbi->s_uid;
1461 else
1462 i_uid_write(inode, uid);
1463
1464 gid = le32_to_cpu(fe->gid);
1465 if (gid == UDF_INVALID_ID ||
1466 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1467 inode->i_gid = sbi->s_gid;
1468 else
1469 i_gid_write(inode, gid);
1470
1471 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1472 sbi->s_fmode != UDF_INVALID_MODE)
1473 inode->i_mode = sbi->s_fmode;
1474 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1475 sbi->s_dmode != UDF_INVALID_MODE)
1476 inode->i_mode = sbi->s_dmode;
1477 else
1478 inode->i_mode = udf_convert_permissions(fe);
1479 inode->i_mode &= ~sbi->s_umask;
1480 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1481
1482 read_unlock(&sbi->s_cred_lock);
1483
1484 link_count = le16_to_cpu(fe->fileLinkCount);
1485 if (!link_count) {
1486 if (!hidden_inode) {
1487 ret = -ESTALE;
1488 goto out;
1489 }
1490 link_count = 1;
1491 }
1492 set_nlink(inode, link_count);
1493
1494 inode->i_size = le64_to_cpu(fe->informationLength);
1495 iinfo->i_lenExtents = inode->i_size;
1496
1497 if (iinfo->i_efe == 0) {
1498 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1499 (inode->i_sb->s_blocksize_bits - 9);
1500
1501 udf_disk_stamp_to_time(&ts, fe->accessTime);
1502 inode_set_atime_to_ts(inode, ts);
1503 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1504 inode_set_mtime_to_ts(inode, ts);
1505 udf_disk_stamp_to_time(&ts, fe->attrTime);
1506 inode_set_ctime_to_ts(inode, ts);
1507
1508 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1509 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1510 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1511 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1512 iinfo->i_streamdir = 0;
1513 iinfo->i_lenStreams = 0;
1514 } else {
1515 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1516 (inode->i_sb->s_blocksize_bits - 9);
1517
1518 udf_disk_stamp_to_time(&ts, efe->accessTime);
1519 inode_set_atime_to_ts(inode, ts);
1520 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1521 inode_set_mtime_to_ts(inode, ts);
1522 udf_disk_stamp_to_time(&ts, efe->attrTime);
1523 inode_set_ctime_to_ts(inode, ts);
1524 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1525
1526 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1527 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1528 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1529 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1530
1531 /* Named streams */
1532 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1533 iinfo->i_locStreamdir =
1534 lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1535 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1536 if (iinfo->i_lenStreams >= inode->i_size)
1537 iinfo->i_lenStreams -= inode->i_size;
1538 else
1539 iinfo->i_lenStreams = 0;
1540 }
1541 inode->i_generation = iinfo->i_unique;
1542
1543 /*
1544 * Sanity check length of allocation descriptors and extended attrs to
1545 * avoid integer overflows
1546 */
1547 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1548 goto out;
1549 /* Now do exact checks */
1550 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1551 goto out;
1552 /* Sanity checks for files in ICB so that we don't get confused later */
1553 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1554 /*
1555 * For file in ICB data is stored in allocation descriptor
1556 * so sizes should match
1557 */
1558 if (iinfo->i_lenAlloc != inode->i_size)
1559 goto out;
1560 /* File in ICB has to fit in there... */
1561 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1562 goto out;
1563 }
1564
1565 switch (fe->icbTag.fileType) {
1566 case ICBTAG_FILE_TYPE_DIRECTORY:
1567 inode->i_op = &udf_dir_inode_operations;
1568 inode->i_fop = &udf_dir_operations;
1569 inode->i_mode |= S_IFDIR;
1570 inc_nlink(inode);
1571 break;
1572 case ICBTAG_FILE_TYPE_REALTIME:
1573 case ICBTAG_FILE_TYPE_REGULAR:
1574 case ICBTAG_FILE_TYPE_UNDEF:
1575 case ICBTAG_FILE_TYPE_VAT20:
1576 inode->i_data.a_ops = &udf_aops;
1577 inode->i_op = &udf_file_inode_operations;
1578 inode->i_fop = &udf_file_operations;
1579 inode->i_mode |= S_IFREG;
1580 break;
1581 case ICBTAG_FILE_TYPE_BLOCK:
1582 inode->i_mode |= S_IFBLK;
1583 break;
1584 case ICBTAG_FILE_TYPE_CHAR:
1585 inode->i_mode |= S_IFCHR;
1586 break;
1587 case ICBTAG_FILE_TYPE_FIFO:
1588 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1589 break;
1590 case ICBTAG_FILE_TYPE_SOCKET:
1591 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1592 break;
1593 case ICBTAG_FILE_TYPE_SYMLINK:
1594 inode->i_data.a_ops = &udf_symlink_aops;
1595 inode->i_op = &udf_symlink_inode_operations;
1596 inode_nohighmem(inode);
1597 inode->i_mode = S_IFLNK | 0777;
1598 break;
1599 case ICBTAG_FILE_TYPE_MAIN:
1600 udf_debug("METADATA FILE-----\n");
1601 break;
1602 case ICBTAG_FILE_TYPE_MIRROR:
1603 udf_debug("METADATA MIRROR FILE-----\n");
1604 break;
1605 case ICBTAG_FILE_TYPE_BITMAP:
1606 udf_debug("METADATA BITMAP FILE-----\n");
1607 break;
1608 default:
1609 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1610 inode->i_ino, fe->icbTag.fileType);
1611 goto out;
1612 }
1613 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1614 struct deviceSpec *dsea =
1615 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1616 if (dsea) {
1617 init_special_inode(inode, inode->i_mode,
1618 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1619 le32_to_cpu(dsea->minorDeviceIdent)));
1620 /* Developer ID ??? */
1621 } else
1622 goto out;
1623 }
1624 ret = 0;
1625 out:
1626 brelse(bh);
1627 return ret;
1628 }
1629
1630 static int udf_alloc_i_data(struct inode *inode, size_t size)
1631 {
1632 struct udf_inode_info *iinfo = UDF_I(inode);
1633 iinfo->i_data = kmalloc(size, GFP_KERNEL);
1634 if (!iinfo->i_data)
1635 return -ENOMEM;
1636 return 0;
1637 }
1638
1639 static umode_t udf_convert_permissions(struct fileEntry *fe)
1640 {
1641 umode_t mode;
1642 uint32_t permissions;
1643 uint32_t flags;
1644
1645 permissions = le32_to_cpu(fe->permissions);
1646 flags = le16_to_cpu(fe->icbTag.flags);
1647
1648 mode = ((permissions) & 0007) |
1649 ((permissions >> 2) & 0070) |
1650 ((permissions >> 4) & 0700) |
1651 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1652 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1653 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1654
1655 return mode;
1656 }
1657
1658 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1659 {
1660 struct udf_inode_info *iinfo = UDF_I(inode);
1661
1662 /*
1663 * UDF 2.01 sec. 3.3.3.3 Note 2:
1664 * In Unix, delete permission tracks write
1665 */
1666 iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1667 if (mode & 0200)
1668 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1669 if (mode & 0020)
1670 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1671 if (mode & 0002)
1672 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1673 }
1674
1675 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1676 {
1677 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1678 }
1679
1680 static int udf_sync_inode(struct inode *inode)
1681 {
1682 return udf_update_inode(inode, 1);
1683 }
1684
1685 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1686 {
1687 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1688 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1689 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1690 iinfo->i_crtime = time;
1691 }
1692
1693 static int udf_update_inode(struct inode *inode, int do_sync)
1694 {
1695 struct buffer_head *bh = NULL;
1696 struct fileEntry *fe;
1697 struct extendedFileEntry *efe;
1698 uint64_t lb_recorded;
1699 uint32_t udfperms;
1700 uint16_t icbflags;
1701 uint16_t crclen;
1702 int err = 0;
1703 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1704 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1705 struct udf_inode_info *iinfo = UDF_I(inode);
1706
1707 bh = sb_getblk(inode->i_sb,
1708 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1709 if (!bh) {
1710 udf_debug("getblk failure\n");
1711 return -EIO;
1712 }
1713
1714 lock_buffer(bh);
1715 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1716 fe = (struct fileEntry *)bh->b_data;
1717 efe = (struct extendedFileEntry *)bh->b_data;
1718
1719 if (iinfo->i_use) {
1720 struct unallocSpaceEntry *use =
1721 (struct unallocSpaceEntry *)bh->b_data;
1722
1723 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1724 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1725 iinfo->i_data, inode->i_sb->s_blocksize -
1726 sizeof(struct unallocSpaceEntry));
1727 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1728 crclen = sizeof(struct unallocSpaceEntry);
1729
1730 goto finish;
1731 }
1732
1733 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1734 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1735 else
1736 fe->uid = cpu_to_le32(i_uid_read(inode));
1737
1738 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1739 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1740 else
1741 fe->gid = cpu_to_le32(i_gid_read(inode));
1742
1743 udfperms = ((inode->i_mode & 0007)) |
1744 ((inode->i_mode & 0070) << 2) |
1745 ((inode->i_mode & 0700) << 4);
1746
1747 udfperms |= iinfo->i_extraPerms;
1748 fe->permissions = cpu_to_le32(udfperms);
1749
1750 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1751 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1752 else {
1753 if (iinfo->i_hidden)
1754 fe->fileLinkCount = cpu_to_le16(0);
1755 else
1756 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1757 }
1758
1759 fe->informationLength = cpu_to_le64(inode->i_size);
1760
1761 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1762 struct regid *eid;
1763 struct deviceSpec *dsea =
1764 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1765 if (!dsea) {
1766 dsea = (struct deviceSpec *)
1767 udf_add_extendedattr(inode,
1768 sizeof(struct deviceSpec) +
1769 sizeof(struct regid), 12, 0x3);
1770 dsea->attrType = cpu_to_le32(12);
1771 dsea->attrSubtype = 1;
1772 dsea->attrLength = cpu_to_le32(
1773 sizeof(struct deviceSpec) +
1774 sizeof(struct regid));
1775 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1776 }
1777 eid = (struct regid *)dsea->impUse;
1778 memset(eid, 0, sizeof(*eid));
1779 strcpy(eid->ident, UDF_ID_DEVELOPER);
1780 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1781 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1782 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1783 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1784 }
1785
1786 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1787 lb_recorded = 0; /* No extents => no blocks! */
1788 else
1789 lb_recorded =
1790 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1791 (blocksize_bits - 9);
1792
1793 if (iinfo->i_efe == 0) {
1794 memcpy(bh->b_data + sizeof(struct fileEntry),
1795 iinfo->i_data,
1796 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1797 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1798
1799 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1800 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
1801 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1802 memset(&(fe->impIdent), 0, sizeof(struct regid));
1803 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1804 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1805 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1806 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1807 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1808 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1809 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1810 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1811 crclen = sizeof(struct fileEntry);
1812 } else {
1813 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1814 iinfo->i_data,
1815 inode->i_sb->s_blocksize -
1816 sizeof(struct extendedFileEntry));
1817 efe->objectSize =
1818 cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1819 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1820
1821 if (iinfo->i_streamdir) {
1822 struct long_ad *icb_lad = &efe->streamDirectoryICB;
1823
1824 icb_lad->extLocation =
1825 cpu_to_lelb(iinfo->i_locStreamdir);
1826 icb_lad->extLength =
1827 cpu_to_le32(inode->i_sb->s_blocksize);
1828 }
1829
1830 udf_adjust_time(iinfo, inode_get_atime(inode));
1831 udf_adjust_time(iinfo, inode_get_mtime(inode));
1832 udf_adjust_time(iinfo, inode_get_ctime(inode));
1833
1834 udf_time_to_disk_stamp(&efe->accessTime,
1835 inode_get_atime(inode));
1836 udf_time_to_disk_stamp(&efe->modificationTime,
1837 inode_get_mtime(inode));
1838 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1839 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1840
1841 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1842 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1843 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1844 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1845 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1846 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1847 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1848 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1849 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1850 crclen = sizeof(struct extendedFileEntry);
1851 }
1852
1853 finish:
1854 if (iinfo->i_strat4096) {
1855 fe->icbTag.strategyType = cpu_to_le16(4096);
1856 fe->icbTag.strategyParameter = cpu_to_le16(1);
1857 fe->icbTag.numEntries = cpu_to_le16(2);
1858 } else {
1859 fe->icbTag.strategyType = cpu_to_le16(4);
1860 fe->icbTag.numEntries = cpu_to_le16(1);
1861 }
1862
1863 if (iinfo->i_use)
1864 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1865 else if (S_ISDIR(inode->i_mode))
1866 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1867 else if (S_ISREG(inode->i_mode))
1868 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1869 else if (S_ISLNK(inode->i_mode))
1870 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1871 else if (S_ISBLK(inode->i_mode))
1872 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1873 else if (S_ISCHR(inode->i_mode))
1874 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1875 else if (S_ISFIFO(inode->i_mode))
1876 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1877 else if (S_ISSOCK(inode->i_mode))
1878 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1879
1880 icbflags = iinfo->i_alloc_type |
1881 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1882 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1883 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1884 (le16_to_cpu(fe->icbTag.flags) &
1885 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1886 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1887
1888 fe->icbTag.flags = cpu_to_le16(icbflags);
1889 if (sbi->s_udfrev >= 0x0200)
1890 fe->descTag.descVersion = cpu_to_le16(3);
1891 else
1892 fe->descTag.descVersion = cpu_to_le16(2);
1893 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1894 fe->descTag.tagLocation = cpu_to_le32(
1895 iinfo->i_location.logicalBlockNum);
1896 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1897 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1898 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1899 crclen));
1900 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1901
1902 set_buffer_uptodate(bh);
1903 unlock_buffer(bh);
1904
1905 /* write the data blocks */
1906 mark_buffer_dirty(bh);
1907 if (do_sync) {
1908 sync_dirty_buffer(bh);
1909 if (buffer_write_io_error(bh)) {
1910 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1911 inode->i_ino);
1912 err = -EIO;
1913 }
1914 }
1915 brelse(bh);
1916
1917 return err;
1918 }
1919
1920 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1921 bool hidden_inode)
1922 {
1923 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1924 struct inode *inode = iget_locked(sb, block);
1925 int err;
1926
1927 if (!inode)
1928 return ERR_PTR(-ENOMEM);
1929
1930 if (!(inode->i_state & I_NEW)) {
1931 if (UDF_I(inode)->i_hidden != hidden_inode) {
1932 iput(inode);
1933 return ERR_PTR(-EFSCORRUPTED);
1934 }
1935 return inode;
1936 }
1937
1938 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1939 err = udf_read_inode(inode, hidden_inode);
1940 if (err < 0) {
1941 iget_failed(inode);
1942 return ERR_PTR(err);
1943 }
1944 unlock_new_inode(inode);
1945
1946 return inode;
1947 }
1948
1949 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1950 struct extent_position *epos)
1951 {
1952 struct super_block *sb = inode->i_sb;
1953 struct buffer_head *bh;
1954 struct allocExtDesc *aed;
1955 struct extent_position nepos;
1956 struct kernel_lb_addr neloc;
1957 int ver, adsize;
1958
1959 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1960 adsize = sizeof(struct short_ad);
1961 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1962 adsize = sizeof(struct long_ad);
1963 else
1964 return -EIO;
1965
1966 neloc.logicalBlockNum = block;
1967 neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1968
1969 bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1970 if (!bh)
1971 return -EIO;
1972 lock_buffer(bh);
1973 memset(bh->b_data, 0x00, sb->s_blocksize);
1974 set_buffer_uptodate(bh);
1975 unlock_buffer(bh);
1976 mark_buffer_dirty_inode(bh, inode);
1977
1978 aed = (struct allocExtDesc *)(bh->b_data);
1979 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1980 aed->previousAllocExtLocation =
1981 cpu_to_le32(epos->block.logicalBlockNum);
1982 }
1983 aed->lengthAllocDescs = cpu_to_le32(0);
1984 if (UDF_SB(sb)->s_udfrev >= 0x0200)
1985 ver = 3;
1986 else
1987 ver = 2;
1988 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1989 sizeof(struct tag));
1990
1991 nepos.block = neloc;
1992 nepos.offset = sizeof(struct allocExtDesc);
1993 nepos.bh = bh;
1994
1995 /*
1996 * Do we have to copy current last extent to make space for indirect
1997 * one?
1998 */
1999 if (epos->offset + adsize > sb->s_blocksize) {
2000 struct kernel_lb_addr cp_loc;
2001 uint32_t cp_len;
2002 int cp_type;
2003
2004 epos->offset -= adsize;
2005 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2006 cp_len |= ((uint32_t)cp_type) << 30;
2007
2008 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2009 udf_write_aext(inode, epos, &nepos.block,
2010 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2011 } else {
2012 __udf_add_aext(inode, epos, &nepos.block,
2013 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2014 }
2015
2016 brelse(epos->bh);
2017 *epos = nepos;
2018
2019 return 0;
2020 }
2021
2022 /*
2023 * Append extent at the given position - should be the first free one in inode
2024 * / indirect extent. This function assumes there is enough space in the inode
2025 * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2026 */
2027 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2028 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2029 {
2030 struct udf_inode_info *iinfo = UDF_I(inode);
2031 struct allocExtDesc *aed;
2032 int adsize;
2033
2034 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2035 adsize = sizeof(struct short_ad);
2036 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2037 adsize = sizeof(struct long_ad);
2038 else
2039 return -EIO;
2040
2041 if (!epos->bh) {
2042 WARN_ON(iinfo->i_lenAlloc !=
2043 epos->offset - udf_file_entry_alloc_offset(inode));
2044 } else {
2045 aed = (struct allocExtDesc *)epos->bh->b_data;
2046 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2047 epos->offset - sizeof(struct allocExtDesc));
2048 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2049 }
2050
2051 udf_write_aext(inode, epos, eloc, elen, inc);
2052
2053 if (!epos->bh) {
2054 iinfo->i_lenAlloc += adsize;
2055 mark_inode_dirty(inode);
2056 } else {
2057 aed = (struct allocExtDesc *)epos->bh->b_data;
2058 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2059 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2060 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2061 udf_update_tag(epos->bh->b_data,
2062 epos->offset + (inc ? 0 : adsize));
2063 else
2064 udf_update_tag(epos->bh->b_data,
2065 sizeof(struct allocExtDesc));
2066 mark_buffer_dirty_inode(epos->bh, inode);
2067 }
2068
2069 return 0;
2070 }
2071
2072 /*
2073 * Append extent at given position - should be the first free one in inode
2074 * / indirect extent. Takes care of allocating and linking indirect blocks.
2075 */
2076 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2077 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2078 {
2079 int adsize;
2080 struct super_block *sb = inode->i_sb;
2081
2082 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2083 adsize = sizeof(struct short_ad);
2084 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2085 adsize = sizeof(struct long_ad);
2086 else
2087 return -EIO;
2088
2089 if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2090 int err;
2091 udf_pblk_t new_block;
2092
2093 new_block = udf_new_block(sb, NULL,
2094 epos->block.partitionReferenceNum,
2095 epos->block.logicalBlockNum, &err);
2096 if (!new_block)
2097 return -ENOSPC;
2098
2099 err = udf_setup_indirect_aext(inode, new_block, epos);
2100 if (err)
2101 return err;
2102 }
2103
2104 return __udf_add_aext(inode, epos, eloc, elen, inc);
2105 }
2106
2107 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2108 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2109 {
2110 int adsize;
2111 uint8_t *ptr;
2112 struct short_ad *sad;
2113 struct long_ad *lad;
2114 struct udf_inode_info *iinfo = UDF_I(inode);
2115
2116 if (!epos->bh)
2117 ptr = iinfo->i_data + epos->offset -
2118 udf_file_entry_alloc_offset(inode) +
2119 iinfo->i_lenEAttr;
2120 else
2121 ptr = epos->bh->b_data + epos->offset;
2122
2123 switch (iinfo->i_alloc_type) {
2124 case ICBTAG_FLAG_AD_SHORT:
2125 sad = (struct short_ad *)ptr;
2126 sad->extLength = cpu_to_le32(elen);
2127 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2128 adsize = sizeof(struct short_ad);
2129 break;
2130 case ICBTAG_FLAG_AD_LONG:
2131 lad = (struct long_ad *)ptr;
2132 lad->extLength = cpu_to_le32(elen);
2133 lad->extLocation = cpu_to_lelb(*eloc);
2134 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2135 adsize = sizeof(struct long_ad);
2136 break;
2137 default:
2138 return;
2139 }
2140
2141 if (epos->bh) {
2142 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2143 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2144 struct allocExtDesc *aed =
2145 (struct allocExtDesc *)epos->bh->b_data;
2146 udf_update_tag(epos->bh->b_data,
2147 le32_to_cpu(aed->lengthAllocDescs) +
2148 sizeof(struct allocExtDesc));
2149 }
2150 mark_buffer_dirty_inode(epos->bh, inode);
2151 } else {
2152 mark_inode_dirty(inode);
2153 }
2154
2155 if (inc)
2156 epos->offset += adsize;
2157 }
2158
2159 /*
2160 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2161 * someone does some weird stuff.
2162 */
2163 #define UDF_MAX_INDIR_EXTS 16
2164
2165 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2166 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2167 {
2168 int8_t etype;
2169 unsigned int indirections = 0;
2170
2171 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2172 (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2173 udf_pblk_t block;
2174
2175 if (++indirections > UDF_MAX_INDIR_EXTS) {
2176 udf_err(inode->i_sb,
2177 "too many indirect extents in inode %lu\n",
2178 inode->i_ino);
2179 return -1;
2180 }
2181
2182 epos->block = *eloc;
2183 epos->offset = sizeof(struct allocExtDesc);
2184 brelse(epos->bh);
2185 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2186 epos->bh = sb_bread(inode->i_sb, block);
2187 if (!epos->bh) {
2188 udf_debug("reading block %u failed!\n", block);
2189 return -1;
2190 }
2191 }
2192
2193 return etype;
2194 }
2195
2196 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2197 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2198 {
2199 int alen;
2200 int8_t etype;
2201 uint8_t *ptr;
2202 struct short_ad *sad;
2203 struct long_ad *lad;
2204 struct udf_inode_info *iinfo = UDF_I(inode);
2205
2206 if (!epos->bh) {
2207 if (!epos->offset)
2208 epos->offset = udf_file_entry_alloc_offset(inode);
2209 ptr = iinfo->i_data + epos->offset -
2210 udf_file_entry_alloc_offset(inode) +
2211 iinfo->i_lenEAttr;
2212 alen = udf_file_entry_alloc_offset(inode) +
2213 iinfo->i_lenAlloc;
2214 } else {
2215 if (!epos->offset)
2216 epos->offset = sizeof(struct allocExtDesc);
2217 ptr = epos->bh->b_data + epos->offset;
2218 alen = sizeof(struct allocExtDesc) +
2219 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2220 lengthAllocDescs);
2221 }
2222
2223 switch (iinfo->i_alloc_type) {
2224 case ICBTAG_FLAG_AD_SHORT:
2225 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2226 if (!sad)
2227 return -1;
2228 etype = le32_to_cpu(sad->extLength) >> 30;
2229 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2230 eloc->partitionReferenceNum =
2231 iinfo->i_location.partitionReferenceNum;
2232 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2233 break;
2234 case ICBTAG_FLAG_AD_LONG:
2235 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2236 if (!lad)
2237 return -1;
2238 etype = le32_to_cpu(lad->extLength) >> 30;
2239 *eloc = lelb_to_cpu(lad->extLocation);
2240 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2241 break;
2242 default:
2243 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2244 return -1;
2245 }
2246
2247 return etype;
2248 }
2249
2250 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2251 struct kernel_lb_addr neloc, uint32_t nelen)
2252 {
2253 struct kernel_lb_addr oeloc;
2254 uint32_t oelen;
2255 int8_t etype;
2256 int err;
2257
2258 if (epos.bh)
2259 get_bh(epos.bh);
2260
2261 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2262 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2263 neloc = oeloc;
2264 nelen = (etype << 30) | oelen;
2265 }
2266 err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2267 brelse(epos.bh);
2268
2269 return err;
2270 }
2271
2272 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2273 {
2274 struct extent_position oepos;
2275 int adsize;
2276 int8_t etype;
2277 struct allocExtDesc *aed;
2278 struct udf_inode_info *iinfo;
2279 struct kernel_lb_addr eloc;
2280 uint32_t elen;
2281
2282 if (epos.bh) {
2283 get_bh(epos.bh);
2284 get_bh(epos.bh);
2285 }
2286
2287 iinfo = UDF_I(inode);
2288 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2289 adsize = sizeof(struct short_ad);
2290 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2291 adsize = sizeof(struct long_ad);
2292 else
2293 adsize = 0;
2294
2295 oepos = epos;
2296 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2297 return -1;
2298
2299 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2300 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2301 if (oepos.bh != epos.bh) {
2302 oepos.block = epos.block;
2303 brelse(oepos.bh);
2304 get_bh(epos.bh);
2305 oepos.bh = epos.bh;
2306 oepos.offset = epos.offset - adsize;
2307 }
2308 }
2309 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2310 elen = 0;
2311
2312 if (epos.bh != oepos.bh) {
2313 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2314 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2315 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2316 if (!oepos.bh) {
2317 iinfo->i_lenAlloc -= (adsize * 2);
2318 mark_inode_dirty(inode);
2319 } else {
2320 aed = (struct allocExtDesc *)oepos.bh->b_data;
2321 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2322 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2323 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2324 udf_update_tag(oepos.bh->b_data,
2325 oepos.offset - (2 * adsize));
2326 else
2327 udf_update_tag(oepos.bh->b_data,
2328 sizeof(struct allocExtDesc));
2329 mark_buffer_dirty_inode(oepos.bh, inode);
2330 }
2331 } else {
2332 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2333 if (!oepos.bh) {
2334 iinfo->i_lenAlloc -= adsize;
2335 mark_inode_dirty(inode);
2336 } else {
2337 aed = (struct allocExtDesc *)oepos.bh->b_data;
2338 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2339 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2340 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2341 udf_update_tag(oepos.bh->b_data,
2342 epos.offset - adsize);
2343 else
2344 udf_update_tag(oepos.bh->b_data,
2345 sizeof(struct allocExtDesc));
2346 mark_buffer_dirty_inode(oepos.bh, inode);
2347 }
2348 }
2349
2350 brelse(epos.bh);
2351 brelse(oepos.bh);
2352
2353 return (elen >> 30);
2354 }
2355
2356 int8_t inode_bmap(struct inode *inode, sector_t block,
2357 struct extent_position *pos, struct kernel_lb_addr *eloc,
2358 uint32_t *elen, sector_t *offset)
2359 {
2360 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2361 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2362 int8_t etype;
2363 struct udf_inode_info *iinfo;
2364
2365 iinfo = UDF_I(inode);
2366 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2367 pos->offset = 0;
2368 pos->block = iinfo->i_location;
2369 pos->bh = NULL;
2370 }
2371 *elen = 0;
2372 do {
2373 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2374 if (etype == -1) {
2375 *offset = (bcount - lbcount) >> blocksize_bits;
2376 iinfo->i_lenExtents = lbcount;
2377 return -1;
2378 }
2379 lbcount += *elen;
2380 } while (lbcount <= bcount);
2381 /* update extent cache */
2382 udf_update_extent_cache(inode, lbcount - *elen, pos);
2383 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2384
2385 return etype;
2386 }
2387
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