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HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
[linux/fpc-iii.git] / fs / udf / inode.c
blob3876448ec0dcb13a61c3be16960fc3e6a5a5522b
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/writeback.h>
37 #include <linux/slab.h>
38 #include <linux/crc-itu-t.h>
39 #include <linux/mpage.h>
40 #include <linux/uio.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 umode_t udf_convert_permissions(struct fileEntry *);
52 static int udf_update_inode(struct inode *, int);
53 static int udf_sync_inode(struct inode *inode);
54 static int udf_alloc_i_data(struct inode *inode, size_t size);
55 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
56 static int8_t udf_insert_aext(struct inode *, struct extent_position,
57 struct kernel_lb_addr, uint32_t);
58 static void udf_split_extents(struct inode *, int *, int, int,
59 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
60 static void udf_prealloc_extents(struct inode *, int, int,
61 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
62 static void udf_merge_extents(struct inode *,
63 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
64 static void udf_update_extents(struct inode *,
65 struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
66 struct extent_position *);
67 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
68
69 static void __udf_clear_extent_cache(struct inode *inode)
70 {
71 struct udf_inode_info *iinfo = UDF_I(inode);
72
73 if (iinfo->cached_extent.lstart != -1) {
74 brelse(iinfo->cached_extent.epos.bh);
75 iinfo->cached_extent.lstart = -1;
76 }
77 }
78
79 /* Invalidate extent cache */
80 static void udf_clear_extent_cache(struct inode *inode)
81 {
82 struct udf_inode_info *iinfo = UDF_I(inode);
83
84 spin_lock(&iinfo->i_extent_cache_lock);
85 __udf_clear_extent_cache(inode);
86 spin_unlock(&iinfo->i_extent_cache_lock);
87 }
88
89 /* Return contents of extent cache */
90 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
91 loff_t *lbcount, struct extent_position *pos)
92 {
93 struct udf_inode_info *iinfo = UDF_I(inode);
94 int ret = 0;
95
96 spin_lock(&iinfo->i_extent_cache_lock);
97 if ((iinfo->cached_extent.lstart <= bcount) &&
98 (iinfo->cached_extent.lstart != -1)) {
99 /* Cache hit */
100 *lbcount = iinfo->cached_extent.lstart;
101 memcpy(pos, &iinfo->cached_extent.epos,
102 sizeof(struct extent_position));
103 if (pos->bh)
104 get_bh(pos->bh);
105 ret = 1;
106 }
107 spin_unlock(&iinfo->i_extent_cache_lock);
108 return ret;
109 }
110
111 /* Add extent to extent cache */
112 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
113 struct extent_position *pos, int next_epos)
114 {
115 struct udf_inode_info *iinfo = UDF_I(inode);
116
117 spin_lock(&iinfo->i_extent_cache_lock);
118 /* Invalidate previously cached extent */
119 __udf_clear_extent_cache(inode);
120 if (pos->bh)
121 get_bh(pos->bh);
122 memcpy(&iinfo->cached_extent.epos, pos,
123 sizeof(struct extent_position));
124 iinfo->cached_extent.lstart = estart;
125 if (next_epos)
126 switch (iinfo->i_alloc_type) {
127 case ICBTAG_FLAG_AD_SHORT:
128 iinfo->cached_extent.epos.offset -=
129 sizeof(struct short_ad);
130 break;
131 case ICBTAG_FLAG_AD_LONG:
132 iinfo->cached_extent.epos.offset -=
133 sizeof(struct long_ad);
134 }
135 spin_unlock(&iinfo->i_extent_cache_lock);
136 }
137
138 void udf_evict_inode(struct inode *inode)
139 {
140 struct udf_inode_info *iinfo = UDF_I(inode);
141 int want_delete = 0;
142
143 if (!inode->i_nlink && !is_bad_inode(inode)) {
144 want_delete = 1;
145 udf_setsize(inode, 0);
146 udf_update_inode(inode, IS_SYNC(inode));
147 }
148 truncate_inode_pages_final(&inode->i_data);
149 invalidate_inode_buffers(inode);
150 clear_inode(inode);
151 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
152 inode->i_size != iinfo->i_lenExtents) {
153 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",
154 inode->i_ino, inode->i_mode,
155 (unsigned long long)inode->i_size,
156 (unsigned long long)iinfo->i_lenExtents);
157 }
158 kfree(iinfo->i_ext.i_data);
159 iinfo->i_ext.i_data = NULL;
160 udf_clear_extent_cache(inode);
161 if (want_delete) {
162 udf_free_inode(inode);
163 }
164 }
165
166 static void udf_write_failed(struct address_space *mapping, loff_t to)
167 {
168 struct inode *inode = mapping->host;
169 struct udf_inode_info *iinfo = UDF_I(inode);
170 loff_t isize = inode->i_size;
171
172 if (to > isize) {
173 truncate_pagecache(inode, isize);
174 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
175 down_write(&iinfo->i_data_sem);
176 udf_clear_extent_cache(inode);
177 udf_truncate_extents(inode);
178 up_write(&iinfo->i_data_sem);
179 }
180 }
181 }
182
183 static int udf_writepage(struct page *page, struct writeback_control *wbc)
184 {
185 return block_write_full_page(page, udf_get_block, wbc);
186 }
187
188 static int udf_writepages(struct address_space *mapping,
189 struct writeback_control *wbc)
190 {
191 return mpage_writepages(mapping, wbc, udf_get_block);
192 }
193
194 static int udf_readpage(struct file *file, struct page *page)
195 {
196 return mpage_readpage(page, udf_get_block);
197 }
198
199 static int udf_readpages(struct file *file, struct address_space *mapping,
200 struct list_head *pages, unsigned nr_pages)
201 {
202 return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
203 }
204
205 static int udf_write_begin(struct file *file, struct address_space *mapping,
206 loff_t pos, unsigned len, unsigned flags,
207 struct page **pagep, void **fsdata)
208 {
209 int ret;
210
211 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
212 if (unlikely(ret))
213 udf_write_failed(mapping, pos + len);
214 return ret;
215 }
216
217 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
218 loff_t offset)
219 {
220 struct file *file = iocb->ki_filp;
221 struct address_space *mapping = file->f_mapping;
222 struct inode *inode = mapping->host;
223 size_t count = iov_iter_count(iter);
224 ssize_t ret;
225
226 ret = blockdev_direct_IO(iocb, inode, iter, offset, udf_get_block);
227 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
228 udf_write_failed(mapping, offset + count);
229 return ret;
230 }
231
232 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
233 {
234 return generic_block_bmap(mapping, block, udf_get_block);
235 }
236
237 const struct address_space_operations udf_aops = {
238 .readpage = udf_readpage,
239 .readpages = udf_readpages,
240 .writepage = udf_writepage,
241 .writepages = udf_writepages,
242 .write_begin = udf_write_begin,
243 .write_end = generic_write_end,
244 .direct_IO = udf_direct_IO,
245 .bmap = udf_bmap,
246 };
247
248 /*
249 * Expand file stored in ICB to a normal one-block-file
250 *
251 * This function requires i_data_sem for writing and releases it.
252 * This function requires i_mutex held
253 */
254 int udf_expand_file_adinicb(struct inode *inode)
255 {
256 struct page *page;
257 char *kaddr;
258 struct udf_inode_info *iinfo = UDF_I(inode);
259 int err;
260 struct writeback_control udf_wbc = {
261 .sync_mode = WB_SYNC_NONE,
262 .nr_to_write = 1,
263 };
264
265 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
266 if (!iinfo->i_lenAlloc) {
267 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
268 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
269 else
270 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
271 /* from now on we have normal address_space methods */
272 inode->i_data.a_ops = &udf_aops;
273 up_write(&iinfo->i_data_sem);
274 mark_inode_dirty(inode);
275 return 0;
276 }
277 /*
278 * Release i_data_sem so that we can lock a page - page lock ranks
279 * above i_data_sem. i_mutex still protects us against file changes.
280 */
281 up_write(&iinfo->i_data_sem);
282
283 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
284 if (!page)
285 return -ENOMEM;
286
287 if (!PageUptodate(page)) {
288 kaddr = kmap(page);
289 memset(kaddr + iinfo->i_lenAlloc, 0x00,
290 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
291 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
292 iinfo->i_lenAlloc);
293 flush_dcache_page(page);
294 SetPageUptodate(page);
295 kunmap(page);
296 }
297 down_write(&iinfo->i_data_sem);
298 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
299 iinfo->i_lenAlloc);
300 iinfo->i_lenAlloc = 0;
301 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
302 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
303 else
304 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
305 /* from now on we have normal address_space methods */
306 inode->i_data.a_ops = &udf_aops;
307 up_write(&iinfo->i_data_sem);
308 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
309 if (err) {
310 /* Restore everything back so that we don't lose data... */
311 lock_page(page);
312 kaddr = kmap(page);
313 down_write(&iinfo->i_data_sem);
314 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
315 inode->i_size);
316 kunmap(page);
317 unlock_page(page);
318 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
319 inode->i_data.a_ops = &udf_adinicb_aops;
320 up_write(&iinfo->i_data_sem);
321 }
322 page_cache_release(page);
323 mark_inode_dirty(inode);
324
325 return err;
326 }
327
328 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
329 int *err)
330 {
331 int newblock;
332 struct buffer_head *dbh = NULL;
333 struct kernel_lb_addr eloc;
334 uint8_t alloctype;
335 struct extent_position epos;
336
337 struct udf_fileident_bh sfibh, dfibh;
338 loff_t f_pos = udf_ext0_offset(inode);
339 int size = udf_ext0_offset(inode) + inode->i_size;
340 struct fileIdentDesc cfi, *sfi, *dfi;
341 struct udf_inode_info *iinfo = UDF_I(inode);
342
343 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
344 alloctype = ICBTAG_FLAG_AD_SHORT;
345 else
346 alloctype = ICBTAG_FLAG_AD_LONG;
347
348 if (!inode->i_size) {
349 iinfo->i_alloc_type = alloctype;
350 mark_inode_dirty(inode);
351 return NULL;
352 }
353
354 /* alloc block, and copy data to it */
355 *block = udf_new_block(inode->i_sb, inode,
356 iinfo->i_location.partitionReferenceNum,
357 iinfo->i_location.logicalBlockNum, err);
358 if (!(*block))
359 return NULL;
360 newblock = udf_get_pblock(inode->i_sb, *block,
361 iinfo->i_location.partitionReferenceNum,
362 0);
363 if (!newblock)
364 return NULL;
365 dbh = udf_tgetblk(inode->i_sb, newblock);
366 if (!dbh)
367 return NULL;
368 lock_buffer(dbh);
369 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
370 set_buffer_uptodate(dbh);
371 unlock_buffer(dbh);
372 mark_buffer_dirty_inode(dbh, inode);
373
374 sfibh.soffset = sfibh.eoffset =
375 f_pos & (inode->i_sb->s_blocksize - 1);
376 sfibh.sbh = sfibh.ebh = NULL;
377 dfibh.soffset = dfibh.eoffset = 0;
378 dfibh.sbh = dfibh.ebh = dbh;
379 while (f_pos < size) {
380 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
381 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
382 NULL, NULL, NULL);
383 if (!sfi) {
384 brelse(dbh);
385 return NULL;
386 }
387 iinfo->i_alloc_type = alloctype;
388 sfi->descTag.tagLocation = cpu_to_le32(*block);
389 dfibh.soffset = dfibh.eoffset;
390 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
391 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
392 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
393 sfi->fileIdent +
394 le16_to_cpu(sfi->lengthOfImpUse))) {
395 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
396 brelse(dbh);
397 return NULL;
398 }
399 }
400 mark_buffer_dirty_inode(dbh, inode);
401
402 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
403 iinfo->i_lenAlloc);
404 iinfo->i_lenAlloc = 0;
405 eloc.logicalBlockNum = *block;
406 eloc.partitionReferenceNum =
407 iinfo->i_location.partitionReferenceNum;
408 iinfo->i_lenExtents = inode->i_size;
409 epos.bh = NULL;
410 epos.block = iinfo->i_location;
411 epos.offset = udf_file_entry_alloc_offset(inode);
412 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
413 /* UniqueID stuff */
414
415 brelse(epos.bh);
416 mark_inode_dirty(inode);
417 return dbh;
418 }
419
420 static int udf_get_block(struct inode *inode, sector_t block,
421 struct buffer_head *bh_result, int create)
422 {
423 int err, new;
424 sector_t phys = 0;
425 struct udf_inode_info *iinfo;
426
427 if (!create) {
428 phys = udf_block_map(inode, block);
429 if (phys)
430 map_bh(bh_result, inode->i_sb, phys);
431 return 0;
432 }
433
434 err = -EIO;
435 new = 0;
436 iinfo = UDF_I(inode);
437
438 down_write(&iinfo->i_data_sem);
439 if (block == iinfo->i_next_alloc_block + 1) {
440 iinfo->i_next_alloc_block++;
441 iinfo->i_next_alloc_goal++;
442 }
443
444 udf_clear_extent_cache(inode);
445 phys = inode_getblk(inode, block, &err, &new);
446 if (!phys)
447 goto abort;
448
449 if (new)
450 set_buffer_new(bh_result);
451 map_bh(bh_result, inode->i_sb, phys);
452
453 abort:
454 up_write(&iinfo->i_data_sem);
455 return err;
456 }
457
458 static struct buffer_head *udf_getblk(struct inode *inode, long block,
459 int create, int *err)
460 {
461 struct buffer_head *bh;
462 struct buffer_head dummy;
463
464 dummy.b_state = 0;
465 dummy.b_blocknr = -1000;
466 *err = udf_get_block(inode, block, &dummy, create);
467 if (!*err && buffer_mapped(&dummy)) {
468 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
469 if (buffer_new(&dummy)) {
470 lock_buffer(bh);
471 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
472 set_buffer_uptodate(bh);
473 unlock_buffer(bh);
474 mark_buffer_dirty_inode(bh, inode);
475 }
476 return bh;
477 }
478
479 return NULL;
480 }
481
482 /* Extend the file with new blocks totaling 'new_block_bytes',
483 * return the number of extents added
484 */
485 static int udf_do_extend_file(struct inode *inode,
486 struct extent_position *last_pos,
487 struct kernel_long_ad *last_ext,
488 loff_t new_block_bytes)
489 {
490 uint32_t add;
491 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
492 struct super_block *sb = inode->i_sb;
493 struct kernel_lb_addr prealloc_loc = {};
494 int prealloc_len = 0;
495 struct udf_inode_info *iinfo;
496 int err;
497
498 /* The previous extent is fake and we should not extend by anything
499 * - there's nothing to do... */
500 if (!new_block_bytes && fake)
501 return 0;
502
503 iinfo = UDF_I(inode);
504 /* Round the last extent up to a multiple of block size */
505 if (last_ext->extLength & (sb->s_blocksize - 1)) {
506 last_ext->extLength =
507 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
508 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
509 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
510 iinfo->i_lenExtents =
511 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
512 ~(sb->s_blocksize - 1);
513 }
514
515 /* Last extent are just preallocated blocks? */
516 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
517 EXT_NOT_RECORDED_ALLOCATED) {
518 /* Save the extent so that we can reattach it to the end */
519 prealloc_loc = last_ext->extLocation;
520 prealloc_len = last_ext->extLength;
521 /* Mark the extent as a hole */
522 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
523 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
524 last_ext->extLocation.logicalBlockNum = 0;
525 last_ext->extLocation.partitionReferenceNum = 0;
526 }
527
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 udf_add_aext(inode, last_pos, &last_ext->extLocation,
541 last_ext->extLength, 1);
542 count++;
543 } else
544 udf_write_aext(inode, last_pos, &last_ext->extLocation,
545 last_ext->extLength, 1);
546
547 /* Managed to do everything necessary? */
548 if (!new_block_bytes)
549 goto out;
550
551 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
552 last_ext->extLocation.logicalBlockNum = 0;
553 last_ext->extLocation.partitionReferenceNum = 0;
554 add = (1 << 30) - sb->s_blocksize;
555 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
556
557 /* Create enough extents to cover the whole hole */
558 while (new_block_bytes > add) {
559 new_block_bytes -= add;
560 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
561 last_ext->extLength, 1);
562 if (err)
563 return err;
564 count++;
565 }
566 if (new_block_bytes) {
567 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
568 new_block_bytes;
569 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
570 last_ext->extLength, 1);
571 if (err)
572 return err;
573 count++;
574 }
575
576 out:
577 /* Do we have some preallocated blocks saved? */
578 if (prealloc_len) {
579 err = udf_add_aext(inode, last_pos, &prealloc_loc,
580 prealloc_len, 1);
581 if (err)
582 return err;
583 last_ext->extLocation = prealloc_loc;
584 last_ext->extLength = prealloc_len;
585 count++;
586 }
587
588 /* last_pos should point to the last written extent... */
589 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
590 last_pos->offset -= sizeof(struct short_ad);
591 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
592 last_pos->offset -= sizeof(struct long_ad);
593 else
594 return -EIO;
595
596 return count;
597 }
598
599 /* Extend the final block of the file to final_block_len bytes */
600 static void udf_do_extend_final_block(struct inode *inode,
601 struct extent_position *last_pos,
602 struct kernel_long_ad *last_ext,
603 uint32_t final_block_len)
604 {
605 struct super_block *sb = inode->i_sb;
606 uint32_t added_bytes;
607
608 added_bytes = final_block_len -
609 (last_ext->extLength & (sb->s_blocksize - 1));
610 last_ext->extLength += added_bytes;
611 UDF_I(inode)->i_lenExtents += added_bytes;
612
613 udf_write_aext(inode, last_pos, &last_ext->extLocation,
614 last_ext->extLength, 1);
615 }
616
617 static int udf_extend_file(struct inode *inode, loff_t newsize)
618 {
619
620 struct extent_position epos;
621 struct kernel_lb_addr eloc;
622 uint32_t elen;
623 int8_t etype;
624 struct super_block *sb = inode->i_sb;
625 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
626 unsigned long partial_final_block;
627 int adsize;
628 struct udf_inode_info *iinfo = UDF_I(inode);
629 struct kernel_long_ad extent;
630 int err = 0;
631 int within_final_block;
632
633 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
634 adsize = sizeof(struct short_ad);
635 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
636 adsize = sizeof(struct long_ad);
637 else
638 BUG();
639
640 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
641 within_final_block = (etype != -1);
642
643 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
644 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
645 /* File has no extents at all or has empty last
646 * indirect extent! Create a fake extent... */
647 extent.extLocation.logicalBlockNum = 0;
648 extent.extLocation.partitionReferenceNum = 0;
649 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
650 } else {
651 epos.offset -= adsize;
652 etype = udf_next_aext(inode, &epos, &extent.extLocation,
653 &extent.extLength, 0);
654 extent.extLength |= etype << 30;
655 }
656
657 partial_final_block = newsize & (sb->s_blocksize - 1);
658
659 /* File has extent covering the new size (could happen when extending
660 * inside a block)?
661 */
662 if (within_final_block) {
663 /* Extending file within the last file block */
664 udf_do_extend_final_block(inode, &epos, &extent,
665 partial_final_block);
666 } else {
667 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
668 partial_final_block;
669 err = udf_do_extend_file(inode, &epos, &extent, add);
670 }
671
672 if (err < 0)
673 goto out;
674 err = 0;
675 iinfo->i_lenExtents = newsize;
676 out:
677 brelse(epos.bh);
678 return err;
679 }
680
681 static sector_t inode_getblk(struct inode *inode, sector_t block,
682 int *err, int *new)
683 {
684 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
685 struct extent_position prev_epos, cur_epos, next_epos;
686 int count = 0, startnum = 0, endnum = 0;
687 uint32_t elen = 0, tmpelen;
688 struct kernel_lb_addr eloc, tmpeloc;
689 int c = 1;
690 loff_t lbcount = 0, b_off = 0;
691 uint32_t newblocknum, newblock;
692 sector_t offset = 0;
693 int8_t etype;
694 struct udf_inode_info *iinfo = UDF_I(inode);
695 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
696 int lastblock = 0;
697 bool isBeyondEOF;
698
699 *err = 0;
700 *new = 0;
701 prev_epos.offset = udf_file_entry_alloc_offset(inode);
702 prev_epos.block = iinfo->i_location;
703 prev_epos.bh = NULL;
704 cur_epos = next_epos = prev_epos;
705 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
706
707 /* find the extent which contains the block we are looking for.
708 alternate between laarr[0] and laarr[1] for locations of the
709 current extent, and the previous extent */
710 do {
711 if (prev_epos.bh != cur_epos.bh) {
712 brelse(prev_epos.bh);
713 get_bh(cur_epos.bh);
714 prev_epos.bh = cur_epos.bh;
715 }
716 if (cur_epos.bh != next_epos.bh) {
717 brelse(cur_epos.bh);
718 get_bh(next_epos.bh);
719 cur_epos.bh = next_epos.bh;
720 }
721
722 lbcount += elen;
723
724 prev_epos.block = cur_epos.block;
725 cur_epos.block = next_epos.block;
726
727 prev_epos.offset = cur_epos.offset;
728 cur_epos.offset = next_epos.offset;
729
730 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
731 if (etype == -1)
732 break;
733
734 c = !c;
735
736 laarr[c].extLength = (etype << 30) | elen;
737 laarr[c].extLocation = eloc;
738
739 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
740 pgoal = eloc.logicalBlockNum +
741 ((elen + inode->i_sb->s_blocksize - 1) >>
742 inode->i_sb->s_blocksize_bits);
743
744 count++;
745 } while (lbcount + elen <= b_off);
746
747 b_off -= lbcount;
748 offset = b_off >> inode->i_sb->s_blocksize_bits;
749 /*
750 * Move prev_epos and cur_epos into indirect extent if we are at
751 * the pointer to it
752 */
753 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
754 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
755
756 /* if the extent is allocated and recorded, return the block
757 if the extent is not a multiple of the blocksize, round up */
758
759 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
760 if (elen & (inode->i_sb->s_blocksize - 1)) {
761 elen = EXT_RECORDED_ALLOCATED |
762 ((elen + inode->i_sb->s_blocksize - 1) &
763 ~(inode->i_sb->s_blocksize - 1));
764 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
765 }
766 brelse(prev_epos.bh);
767 brelse(cur_epos.bh);
768 brelse(next_epos.bh);
769 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
770 return newblock;
771 }
772
773 /* Are we beyond EOF? */
774 if (etype == -1) {
775 int ret;
776 loff_t hole_len;
777 isBeyondEOF = true;
778 if (count) {
779 if (c)
780 laarr[0] = laarr[1];
781 startnum = 1;
782 } else {
783 /* Create a fake extent when there's not one */
784 memset(&laarr[0].extLocation, 0x00,
785 sizeof(struct kernel_lb_addr));
786 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
787 /* Will udf_do_extend_file() create real extent from
788 a fake one? */
789 startnum = (offset > 0);
790 }
791 /* Create extents for the hole between EOF and offset */
792 hole_len = (loff_t)offset << inode->i_blkbits;
793 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
794 if (ret < 0) {
795 brelse(prev_epos.bh);
796 brelse(cur_epos.bh);
797 brelse(next_epos.bh);
798 *err = ret;
799 return 0;
800 }
801 c = 0;
802 offset = 0;
803 count += ret;
804 /* We are not covered by a preallocated extent? */
805 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
806 EXT_NOT_RECORDED_ALLOCATED) {
807 /* Is there any real extent? - otherwise we overwrite
808 * the fake one... */
809 if (count)
810 c = !c;
811 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
812 inode->i_sb->s_blocksize;
813 memset(&laarr[c].extLocation, 0x00,
814 sizeof(struct kernel_lb_addr));
815 count++;
816 }
817 endnum = c + 1;
818 lastblock = 1;
819 } else {
820 isBeyondEOF = false;
821 endnum = startnum = ((count > 2) ? 2 : count);
822
823 /* if the current extent is in position 0,
824 swap it with the previous */
825 if (!c && count != 1) {
826 laarr[2] = laarr[0];
827 laarr[0] = laarr[1];
828 laarr[1] = laarr[2];
829 c = 1;
830 }
831
832 /* if the current block is located in an extent,
833 read the next extent */
834 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
835 if (etype != -1) {
836 laarr[c + 1].extLength = (etype << 30) | elen;
837 laarr[c + 1].extLocation = eloc;
838 count++;
839 startnum++;
840 endnum++;
841 } else
842 lastblock = 1;
843 }
844
845 /* if the current extent is not recorded but allocated, get the
846 * block in the extent corresponding to the requested block */
847 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
848 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
849 else { /* otherwise, allocate a new block */
850 if (iinfo->i_next_alloc_block == block)
851 goal = iinfo->i_next_alloc_goal;
852
853 if (!goal) {
854 if (!(goal = pgoal)) /* XXX: what was intended here? */
855 goal = iinfo->i_location.logicalBlockNum + 1;
856 }
857
858 newblocknum = udf_new_block(inode->i_sb, inode,
859 iinfo->i_location.partitionReferenceNum,
860 goal, err);
861 if (!newblocknum) {
862 brelse(prev_epos.bh);
863 brelse(cur_epos.bh);
864 brelse(next_epos.bh);
865 *err = -ENOSPC;
866 return 0;
867 }
868 if (isBeyondEOF)
869 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
870 }
871
872 /* if the extent the requsted block is located in contains multiple
873 * blocks, split the extent into at most three extents. blocks prior
874 * to requested block, requested block, and blocks after requested
875 * block */
876 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
877
878 #ifdef UDF_PREALLOCATE
879 /* We preallocate blocks only for regular files. It also makes sense
880 * for directories but there's a problem when to drop the
881 * preallocation. We might use some delayed work for that but I feel
882 * it's overengineering for a filesystem like UDF. */
883 if (S_ISREG(inode->i_mode))
884 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
885 #endif
886
887 /* merge any continuous blocks in laarr */
888 udf_merge_extents(inode, laarr, &endnum);
889
890 /* write back the new extents, inserting new extents if the new number
891 * of extents is greater than the old number, and deleting extents if
892 * the new number of extents is less than the old number */
893 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
894
895 brelse(prev_epos.bh);
896 brelse(cur_epos.bh);
897 brelse(next_epos.bh);
898
899 newblock = udf_get_pblock(inode->i_sb, newblocknum,
900 iinfo->i_location.partitionReferenceNum, 0);
901 if (!newblock) {
902 *err = -EIO;
903 return 0;
904 }
905 *new = 1;
906 iinfo->i_next_alloc_block = block;
907 iinfo->i_next_alloc_goal = newblocknum;
908 inode->i_ctime = current_fs_time(inode->i_sb);
909
910 if (IS_SYNC(inode))
911 udf_sync_inode(inode);
912 else
913 mark_inode_dirty(inode);
914
915 return newblock;
916 }
917
918 static void udf_split_extents(struct inode *inode, int *c, int offset,
919 int newblocknum,
920 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
921 int *endnum)
922 {
923 unsigned long blocksize = inode->i_sb->s_blocksize;
924 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
925
926 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
927 (laarr[*c].extLength >> 30) ==
928 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
929 int curr = *c;
930 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
931 blocksize - 1) >> blocksize_bits;
932 int8_t etype = (laarr[curr].extLength >> 30);
933
934 if (blen == 1)
935 ;
936 else if (!offset || blen == offset + 1) {
937 laarr[curr + 2] = laarr[curr + 1];
938 laarr[curr + 1] = laarr[curr];
939 } else {
940 laarr[curr + 3] = laarr[curr + 1];
941 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
942 }
943
944 if (offset) {
945 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
946 udf_free_blocks(inode->i_sb, inode,
947 &laarr[curr].extLocation,
948 0, offset);
949 laarr[curr].extLength =
950 EXT_NOT_RECORDED_NOT_ALLOCATED |
951 (offset << blocksize_bits);
952 laarr[curr].extLocation.logicalBlockNum = 0;
953 laarr[curr].extLocation.
954 partitionReferenceNum = 0;
955 } else
956 laarr[curr].extLength = (etype << 30) |
957 (offset << blocksize_bits);
958 curr++;
959 (*c)++;
960 (*endnum)++;
961 }
962
963 laarr[curr].extLocation.logicalBlockNum = newblocknum;
964 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
965 laarr[curr].extLocation.partitionReferenceNum =
966 UDF_I(inode)->i_location.partitionReferenceNum;
967 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
968 blocksize;
969 curr++;
970
971 if (blen != offset + 1) {
972 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
973 laarr[curr].extLocation.logicalBlockNum +=
974 offset + 1;
975 laarr[curr].extLength = (etype << 30) |
976 ((blen - (offset + 1)) << blocksize_bits);
977 curr++;
978 (*endnum)++;
979 }
980 }
981 }
982
983 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
984 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
985 int *endnum)
986 {
987 int start, length = 0, currlength = 0, i;
988
989 if (*endnum >= (c + 1)) {
990 if (!lastblock)
991 return;
992 else
993 start = c;
994 } else {
995 if ((laarr[c + 1].extLength >> 30) ==
996 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
997 start = c + 1;
998 length = currlength =
999 (((laarr[c + 1].extLength &
1000 UDF_EXTENT_LENGTH_MASK) +
1001 inode->i_sb->s_blocksize - 1) >>
1002 inode->i_sb->s_blocksize_bits);
1003 } else
1004 start = c;
1005 }
1006
1007 for (i = start + 1; i <= *endnum; i++) {
1008 if (i == *endnum) {
1009 if (lastblock)
1010 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1011 } else if ((laarr[i].extLength >> 30) ==
1012 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1013 length += (((laarr[i].extLength &
1014 UDF_EXTENT_LENGTH_MASK) +
1015 inode->i_sb->s_blocksize - 1) >>
1016 inode->i_sb->s_blocksize_bits);
1017 } else
1018 break;
1019 }
1020
1021 if (length) {
1022 int next = laarr[start].extLocation.logicalBlockNum +
1023 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1024 inode->i_sb->s_blocksize - 1) >>
1025 inode->i_sb->s_blocksize_bits);
1026 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1027 laarr[start].extLocation.partitionReferenceNum,
1028 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1029 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1030 currlength);
1031 if (numalloc) {
1032 if (start == (c + 1))
1033 laarr[start].extLength +=
1034 (numalloc <<
1035 inode->i_sb->s_blocksize_bits);
1036 else {
1037 memmove(&laarr[c + 2], &laarr[c + 1],
1038 sizeof(struct long_ad) * (*endnum - (c + 1)));
1039 (*endnum)++;
1040 laarr[c + 1].extLocation.logicalBlockNum = next;
1041 laarr[c + 1].extLocation.partitionReferenceNum =
1042 laarr[c].extLocation.
1043 partitionReferenceNum;
1044 laarr[c + 1].extLength =
1045 EXT_NOT_RECORDED_ALLOCATED |
1046 (numalloc <<
1047 inode->i_sb->s_blocksize_bits);
1048 start = c + 1;
1049 }
1050
1051 for (i = start + 1; numalloc && i < *endnum; i++) {
1052 int elen = ((laarr[i].extLength &
1053 UDF_EXTENT_LENGTH_MASK) +
1054 inode->i_sb->s_blocksize - 1) >>
1055 inode->i_sb->s_blocksize_bits;
1056
1057 if (elen > numalloc) {
1058 laarr[i].extLength -=
1059 (numalloc <<
1060 inode->i_sb->s_blocksize_bits);
1061 numalloc = 0;
1062 } else {
1063 numalloc -= elen;
1064 if (*endnum > (i + 1))
1065 memmove(&laarr[i],
1066 &laarr[i + 1],
1067 sizeof(struct long_ad) *
1068 (*endnum - (i + 1)));
1069 i--;
1070 (*endnum)--;
1071 }
1072 }
1073 UDF_I(inode)->i_lenExtents +=
1074 numalloc << inode->i_sb->s_blocksize_bits;
1075 }
1076 }
1077 }
1078
1079 static void udf_merge_extents(struct inode *inode,
1080 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1081 int *endnum)
1082 {
1083 int i;
1084 unsigned long blocksize = inode->i_sb->s_blocksize;
1085 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1086
1087 for (i = 0; i < (*endnum - 1); i++) {
1088 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1089 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1090
1091 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1092 (((li->extLength >> 30) ==
1093 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1094 ((lip1->extLocation.logicalBlockNum -
1095 li->extLocation.logicalBlockNum) ==
1096 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1097 blocksize - 1) >> blocksize_bits)))) {
1098
1099 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1100 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1101 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1102 lip1->extLength = (lip1->extLength -
1103 (li->extLength &
1104 UDF_EXTENT_LENGTH_MASK) +
1105 UDF_EXTENT_LENGTH_MASK) &
1106 ~(blocksize - 1);
1107 li->extLength = (li->extLength &
1108 UDF_EXTENT_FLAG_MASK) +
1109 (UDF_EXTENT_LENGTH_MASK + 1) -
1110 blocksize;
1111 lip1->extLocation.logicalBlockNum =
1112 li->extLocation.logicalBlockNum +
1113 ((li->extLength &
1114 UDF_EXTENT_LENGTH_MASK) >>
1115 blocksize_bits);
1116 } else {
1117 li->extLength = lip1->extLength +
1118 (((li->extLength &
1119 UDF_EXTENT_LENGTH_MASK) +
1120 blocksize - 1) & ~(blocksize - 1));
1121 if (*endnum > (i + 2))
1122 memmove(&laarr[i + 1], &laarr[i + 2],
1123 sizeof(struct long_ad) *
1124 (*endnum - (i + 2)));
1125 i--;
1126 (*endnum)--;
1127 }
1128 } else if (((li->extLength >> 30) ==
1129 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1130 ((lip1->extLength >> 30) ==
1131 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1132 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1133 ((li->extLength &
1134 UDF_EXTENT_LENGTH_MASK) +
1135 blocksize - 1) >> blocksize_bits);
1136 li->extLocation.logicalBlockNum = 0;
1137 li->extLocation.partitionReferenceNum = 0;
1138
1139 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1140 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1141 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1142 lip1->extLength = (lip1->extLength -
1143 (li->extLength &
1144 UDF_EXTENT_LENGTH_MASK) +
1145 UDF_EXTENT_LENGTH_MASK) &
1146 ~(blocksize - 1);
1147 li->extLength = (li->extLength &
1148 UDF_EXTENT_FLAG_MASK) +
1149 (UDF_EXTENT_LENGTH_MASK + 1) -
1150 blocksize;
1151 } else {
1152 li->extLength = lip1->extLength +
1153 (((li->extLength &
1154 UDF_EXTENT_LENGTH_MASK) +
1155 blocksize - 1) & ~(blocksize - 1));
1156 if (*endnum > (i + 2))
1157 memmove(&laarr[i + 1], &laarr[i + 2],
1158 sizeof(struct long_ad) *
1159 (*endnum - (i + 2)));
1160 i--;
1161 (*endnum)--;
1162 }
1163 } else if ((li->extLength >> 30) ==
1164 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1165 udf_free_blocks(inode->i_sb, inode,
1166 &li->extLocation, 0,
1167 ((li->extLength &
1168 UDF_EXTENT_LENGTH_MASK) +
1169 blocksize - 1) >> blocksize_bits);
1170 li->extLocation.logicalBlockNum = 0;
1171 li->extLocation.partitionReferenceNum = 0;
1172 li->extLength = (li->extLength &
1173 UDF_EXTENT_LENGTH_MASK) |
1174 EXT_NOT_RECORDED_NOT_ALLOCATED;
1175 }
1176 }
1177 }
1178
1179 static void udf_update_extents(struct inode *inode,
1180 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1181 int startnum, int endnum,
1182 struct extent_position *epos)
1183 {
1184 int start = 0, i;
1185 struct kernel_lb_addr tmploc;
1186 uint32_t tmplen;
1187
1188 if (startnum > endnum) {
1189 for (i = 0; i < (startnum - endnum); i++)
1190 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1191 laarr[i].extLength);
1192 } else if (startnum < endnum) {
1193 for (i = 0; i < (endnum - startnum); i++) {
1194 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1195 laarr[i].extLength);
1196 udf_next_aext(inode, epos, &laarr[i].extLocation,
1197 &laarr[i].extLength, 1);
1198 start++;
1199 }
1200 }
1201
1202 for (i = start; i < endnum; i++) {
1203 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1204 udf_write_aext(inode, epos, &laarr[i].extLocation,
1205 laarr[i].extLength, 1);
1206 }
1207 }
1208
1209 struct buffer_head *udf_bread(struct inode *inode, int block,
1210 int create, int *err)
1211 {
1212 struct buffer_head *bh = NULL;
1213
1214 bh = udf_getblk(inode, block, create, err);
1215 if (!bh)
1216 return NULL;
1217
1218 if (buffer_uptodate(bh))
1219 return bh;
1220
1221 ll_rw_block(READ, 1, &bh);
1222
1223 wait_on_buffer(bh);
1224 if (buffer_uptodate(bh))
1225 return bh;
1226
1227 brelse(bh);
1228 *err = -EIO;
1229 return NULL;
1230 }
1231
1232 int udf_setsize(struct inode *inode, loff_t newsize)
1233 {
1234 int err;
1235 struct udf_inode_info *iinfo;
1236 int bsize = i_blocksize(inode);
1237
1238 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1239 S_ISLNK(inode->i_mode)))
1240 return -EINVAL;
1241 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1242 return -EPERM;
1243
1244 iinfo = UDF_I(inode);
1245 if (newsize > inode->i_size) {
1246 down_write(&iinfo->i_data_sem);
1247 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1248 if (bsize <
1249 (udf_file_entry_alloc_offset(inode) + newsize)) {
1250 err = udf_expand_file_adinicb(inode);
1251 if (err)
1252 return err;
1253 down_write(&iinfo->i_data_sem);
1254 } else {
1255 iinfo->i_lenAlloc = newsize;
1256 goto set_size;
1257 }
1258 }
1259 err = udf_extend_file(inode, newsize);
1260 if (err) {
1261 up_write(&iinfo->i_data_sem);
1262 return err;
1263 }
1264 set_size:
1265 up_write(&iinfo->i_data_sem);
1266 truncate_setsize(inode, newsize);
1267 } else {
1268 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1269 down_write(&iinfo->i_data_sem);
1270 udf_clear_extent_cache(inode);
1271 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1272 0x00, bsize - newsize -
1273 udf_file_entry_alloc_offset(inode));
1274 iinfo->i_lenAlloc = newsize;
1275 truncate_setsize(inode, newsize);
1276 up_write(&iinfo->i_data_sem);
1277 goto update_time;
1278 }
1279 err = block_truncate_page(inode->i_mapping, newsize,
1280 udf_get_block);
1281 if (err)
1282 return err;
1283 truncate_setsize(inode, newsize);
1284 down_write(&iinfo->i_data_sem);
1285 udf_clear_extent_cache(inode);
1286 udf_truncate_extents(inode);
1287 up_write(&iinfo->i_data_sem);
1288 }
1289 update_time:
1290 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1291 if (IS_SYNC(inode))
1292 udf_sync_inode(inode);
1293 else
1294 mark_inode_dirty(inode);
1295 return 0;
1296 }
1297
1298 /*
1299 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1300 * arbitrary - just that we hopefully don't limit any real use of rewritten
1301 * inode on write-once media but avoid looping for too long on corrupted media.
1302 */
1303 #define UDF_MAX_ICB_NESTING 1024
1304
1305 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1306 {
1307 struct buffer_head *bh = NULL;
1308 struct fileEntry *fe;
1309 struct extendedFileEntry *efe;
1310 uint16_t ident;
1311 struct udf_inode_info *iinfo = UDF_I(inode);
1312 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1313 struct kernel_lb_addr *iloc = &iinfo->i_location;
1314 unsigned int link_count;
1315 unsigned int indirections = 0;
1316 int bs = inode->i_sb->s_blocksize;
1317 int ret = -EIO;
1318
1319 reread:
1320 if (iloc->logicalBlockNum >=
1321 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1322 udf_debug("block=%d, partition=%d out of range\n",
1323 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1324 return -EIO;
1325 }
1326
1327 /*
1328 * Set defaults, but the inode is still incomplete!
1329 * Note: get_new_inode() sets the following on a new inode:
1330 * i_sb = sb
1331 * i_no = ino
1332 * i_flags = sb->s_flags
1333 * i_state = 0
1334 * clean_inode(): zero fills and sets
1335 * i_count = 1
1336 * i_nlink = 1
1337 * i_op = NULL;
1338 */
1339 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1340 if (!bh) {
1341 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1342 return -EIO;
1343 }
1344
1345 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1346 ident != TAG_IDENT_USE) {
1347 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1348 inode->i_ino, ident);
1349 goto out;
1350 }
1351
1352 fe = (struct fileEntry *)bh->b_data;
1353 efe = (struct extendedFileEntry *)bh->b_data;
1354
1355 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1356 struct buffer_head *ibh;
1357
1358 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1359 if (ident == TAG_IDENT_IE && ibh) {
1360 struct kernel_lb_addr loc;
1361 struct indirectEntry *ie;
1362
1363 ie = (struct indirectEntry *)ibh->b_data;
1364 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1365
1366 if (ie->indirectICB.extLength) {
1367 brelse(ibh);
1368 memcpy(&iinfo->i_location, &loc,
1369 sizeof(struct kernel_lb_addr));
1370 if (++indirections > UDF_MAX_ICB_NESTING) {
1371 udf_err(inode->i_sb,
1372 "too many ICBs in ICB hierarchy"
1373 " (max %d supported)\n",
1374 UDF_MAX_ICB_NESTING);
1375 goto out;
1376 }
1377 brelse(bh);
1378 goto reread;
1379 }
1380 }
1381 brelse(ibh);
1382 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1383 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1384 le16_to_cpu(fe->icbTag.strategyType));
1385 goto out;
1386 }
1387 if (fe->icbTag.strategyType == cpu_to_le16(4))
1388 iinfo->i_strat4096 = 0;
1389 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1390 iinfo->i_strat4096 = 1;
1391
1392 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1393 ICBTAG_FLAG_AD_MASK;
1394 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1395 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1396 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1397 ret = -EIO;
1398 goto out;
1399 }
1400 iinfo->i_unique = 0;
1401 iinfo->i_lenEAttr = 0;
1402 iinfo->i_lenExtents = 0;
1403 iinfo->i_lenAlloc = 0;
1404 iinfo->i_next_alloc_block = 0;
1405 iinfo->i_next_alloc_goal = 0;
1406 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1407 iinfo->i_efe = 1;
1408 iinfo->i_use = 0;
1409 ret = udf_alloc_i_data(inode, bs -
1410 sizeof(struct extendedFileEntry));
1411 if (ret)
1412 goto out;
1413 memcpy(iinfo->i_ext.i_data,
1414 bh->b_data + sizeof(struct extendedFileEntry),
1415 bs - sizeof(struct extendedFileEntry));
1416 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1417 iinfo->i_efe = 0;
1418 iinfo->i_use = 0;
1419 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1420 if (ret)
1421 goto out;
1422 memcpy(iinfo->i_ext.i_data,
1423 bh->b_data + sizeof(struct fileEntry),
1424 bs - sizeof(struct fileEntry));
1425 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1426 iinfo->i_efe = 0;
1427 iinfo->i_use = 1;
1428 iinfo->i_lenAlloc = le32_to_cpu(
1429 ((struct unallocSpaceEntry *)bh->b_data)->
1430 lengthAllocDescs);
1431 ret = udf_alloc_i_data(inode, bs -
1432 sizeof(struct unallocSpaceEntry));
1433 if (ret)
1434 goto out;
1435 memcpy(iinfo->i_ext.i_data,
1436 bh->b_data + sizeof(struct unallocSpaceEntry),
1437 bs - sizeof(struct unallocSpaceEntry));
1438 return 0;
1439 }
1440
1441 ret = -EIO;
1442 read_lock(&sbi->s_cred_lock);
1443 i_uid_write(inode, le32_to_cpu(fe->uid));
1444 if (!uid_valid(inode->i_uid) ||
1445 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1446 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1447 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1448
1449 i_gid_write(inode, le32_to_cpu(fe->gid));
1450 if (!gid_valid(inode->i_gid) ||
1451 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1452 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1453 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1454
1455 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1456 sbi->s_fmode != UDF_INVALID_MODE)
1457 inode->i_mode = sbi->s_fmode;
1458 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1459 sbi->s_dmode != UDF_INVALID_MODE)
1460 inode->i_mode = sbi->s_dmode;
1461 else
1462 inode->i_mode = udf_convert_permissions(fe);
1463 inode->i_mode &= ~sbi->s_umask;
1464 read_unlock(&sbi->s_cred_lock);
1465
1466 link_count = le16_to_cpu(fe->fileLinkCount);
1467 if (!link_count) {
1468 if (!hidden_inode) {
1469 ret = -ESTALE;
1470 goto out;
1471 }
1472 link_count = 1;
1473 }
1474 set_nlink(inode, link_count);
1475
1476 inode->i_size = le64_to_cpu(fe->informationLength);
1477 iinfo->i_lenExtents = inode->i_size;
1478
1479 if (iinfo->i_efe == 0) {
1480 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1481 (inode->i_sb->s_blocksize_bits - 9);
1482
1483 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1484 inode->i_atime = sbi->s_record_time;
1485
1486 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1487 fe->modificationTime))
1488 inode->i_mtime = sbi->s_record_time;
1489
1490 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1491 inode->i_ctime = sbi->s_record_time;
1492
1493 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1494 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1495 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1496 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1497 } else {
1498 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1499 (inode->i_sb->s_blocksize_bits - 9);
1500
1501 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1502 inode->i_atime = sbi->s_record_time;
1503
1504 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1505 efe->modificationTime))
1506 inode->i_mtime = sbi->s_record_time;
1507
1508 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1509 iinfo->i_crtime = sbi->s_record_time;
1510
1511 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1512 inode->i_ctime = sbi->s_record_time;
1513
1514 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1515 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1516 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1517 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1518 }
1519 inode->i_generation = iinfo->i_unique;
1520
1521 /*
1522 * Sanity check length of allocation descriptors and extended attrs to
1523 * avoid integer overflows
1524 */
1525 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1526 goto out;
1527 /* Now do exact checks */
1528 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1529 goto out;
1530 /* Sanity checks for files in ICB so that we don't get confused later */
1531 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1532 /*
1533 * For file in ICB data is stored in allocation descriptor
1534 * so sizes should match
1535 */
1536 if (iinfo->i_lenAlloc != inode->i_size)
1537 goto out;
1538 /* File in ICB has to fit in there... */
1539 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1540 goto out;
1541 }
1542
1543 switch (fe->icbTag.fileType) {
1544 case ICBTAG_FILE_TYPE_DIRECTORY:
1545 inode->i_op = &udf_dir_inode_operations;
1546 inode->i_fop = &udf_dir_operations;
1547 inode->i_mode |= S_IFDIR;
1548 inc_nlink(inode);
1549 break;
1550 case ICBTAG_FILE_TYPE_REALTIME:
1551 case ICBTAG_FILE_TYPE_REGULAR:
1552 case ICBTAG_FILE_TYPE_UNDEF:
1553 case ICBTAG_FILE_TYPE_VAT20:
1554 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1555 inode->i_data.a_ops = &udf_adinicb_aops;
1556 else
1557 inode->i_data.a_ops = &udf_aops;
1558 inode->i_op = &udf_file_inode_operations;
1559 inode->i_fop = &udf_file_operations;
1560 inode->i_mode |= S_IFREG;
1561 break;
1562 case ICBTAG_FILE_TYPE_BLOCK:
1563 inode->i_mode |= S_IFBLK;
1564 break;
1565 case ICBTAG_FILE_TYPE_CHAR:
1566 inode->i_mode |= S_IFCHR;
1567 break;
1568 case ICBTAG_FILE_TYPE_FIFO:
1569 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1570 break;
1571 case ICBTAG_FILE_TYPE_SOCKET:
1572 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1573 break;
1574 case ICBTAG_FILE_TYPE_SYMLINK:
1575 inode->i_data.a_ops = &udf_symlink_aops;
1576 inode->i_op = &udf_symlink_inode_operations;
1577 inode->i_mode = S_IFLNK | S_IRWXUGO;
1578 break;
1579 case ICBTAG_FILE_TYPE_MAIN:
1580 udf_debug("METADATA FILE-----\n");
1581 break;
1582 case ICBTAG_FILE_TYPE_MIRROR:
1583 udf_debug("METADATA MIRROR FILE-----\n");
1584 break;
1585 case ICBTAG_FILE_TYPE_BITMAP:
1586 udf_debug("METADATA BITMAP FILE-----\n");
1587 break;
1588 default:
1589 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1590 inode->i_ino, fe->icbTag.fileType);
1591 goto out;
1592 }
1593 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1594 struct deviceSpec *dsea =
1595 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1596 if (dsea) {
1597 init_special_inode(inode, inode->i_mode,
1598 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1599 le32_to_cpu(dsea->minorDeviceIdent)));
1600 /* Developer ID ??? */
1601 } else
1602 goto out;
1603 }
1604 ret = 0;
1605 out:
1606 brelse(bh);
1607 return ret;
1608 }
1609
1610 static int udf_alloc_i_data(struct inode *inode, size_t size)
1611 {
1612 struct udf_inode_info *iinfo = UDF_I(inode);
1613 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1614
1615 if (!iinfo->i_ext.i_data) {
1616 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1617 inode->i_ino);
1618 return -ENOMEM;
1619 }
1620
1621 return 0;
1622 }
1623
1624 static umode_t udf_convert_permissions(struct fileEntry *fe)
1625 {
1626 umode_t mode;
1627 uint32_t permissions;
1628 uint32_t flags;
1629
1630 permissions = le32_to_cpu(fe->permissions);
1631 flags = le16_to_cpu(fe->icbTag.flags);
1632
1633 mode = ((permissions) & S_IRWXO) |
1634 ((permissions >> 2) & S_IRWXG) |
1635 ((permissions >> 4) & S_IRWXU) |
1636 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1637 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1638 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1639
1640 return mode;
1641 }
1642
1643 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1644 {
1645 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1646 }
1647
1648 static int udf_sync_inode(struct inode *inode)
1649 {
1650 return udf_update_inode(inode, 1);
1651 }
1652
1653 static int udf_update_inode(struct inode *inode, int do_sync)
1654 {
1655 struct buffer_head *bh = NULL;
1656 struct fileEntry *fe;
1657 struct extendedFileEntry *efe;
1658 uint64_t lb_recorded;
1659 uint32_t udfperms;
1660 uint16_t icbflags;
1661 uint16_t crclen;
1662 int err = 0;
1663 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1664 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1665 struct udf_inode_info *iinfo = UDF_I(inode);
1666
1667 bh = udf_tgetblk(inode->i_sb,
1668 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1669 if (!bh) {
1670 udf_debug("getblk failure\n");
1671 return -EIO;
1672 }
1673
1674 lock_buffer(bh);
1675 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1676 fe = (struct fileEntry *)bh->b_data;
1677 efe = (struct extendedFileEntry *)bh->b_data;
1678
1679 if (iinfo->i_use) {
1680 struct unallocSpaceEntry *use =
1681 (struct unallocSpaceEntry *)bh->b_data;
1682
1683 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1684 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1685 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1686 sizeof(struct unallocSpaceEntry));
1687 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1688 crclen = sizeof(struct unallocSpaceEntry);
1689
1690 goto finish;
1691 }
1692
1693 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1694 fe->uid = cpu_to_le32(-1);
1695 else
1696 fe->uid = cpu_to_le32(i_uid_read(inode));
1697
1698 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1699 fe->gid = cpu_to_le32(-1);
1700 else
1701 fe->gid = cpu_to_le32(i_gid_read(inode));
1702
1703 udfperms = ((inode->i_mode & S_IRWXO)) |
1704 ((inode->i_mode & S_IRWXG) << 2) |
1705 ((inode->i_mode & S_IRWXU) << 4);
1706
1707 udfperms |= (le32_to_cpu(fe->permissions) &
1708 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1709 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1710 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1711 fe->permissions = cpu_to_le32(udfperms);
1712
1713 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1714 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1715 else
1716 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1717
1718 fe->informationLength = cpu_to_le64(inode->i_size);
1719
1720 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1721 struct regid *eid;
1722 struct deviceSpec *dsea =
1723 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1724 if (!dsea) {
1725 dsea = (struct deviceSpec *)
1726 udf_add_extendedattr(inode,
1727 sizeof(struct deviceSpec) +
1728 sizeof(struct regid), 12, 0x3);
1729 dsea->attrType = cpu_to_le32(12);
1730 dsea->attrSubtype = 1;
1731 dsea->attrLength = cpu_to_le32(
1732 sizeof(struct deviceSpec) +
1733 sizeof(struct regid));
1734 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1735 }
1736 eid = (struct regid *)dsea->impUse;
1737 memset(eid, 0, sizeof(struct regid));
1738 strcpy(eid->ident, UDF_ID_DEVELOPER);
1739 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1740 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1741 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1742 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1743 }
1744
1745 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1746 lb_recorded = 0; /* No extents => no blocks! */
1747 else
1748 lb_recorded =
1749 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1750 (blocksize_bits - 9);
1751
1752 if (iinfo->i_efe == 0) {
1753 memcpy(bh->b_data + sizeof(struct fileEntry),
1754 iinfo->i_ext.i_data,
1755 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1756 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1757
1758 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1759 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1760 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1761 memset(&(fe->impIdent), 0, sizeof(struct regid));
1762 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1763 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1764 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1765 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1766 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1767 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1768 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1769 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1770 crclen = sizeof(struct fileEntry);
1771 } else {
1772 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1773 iinfo->i_ext.i_data,
1774 inode->i_sb->s_blocksize -
1775 sizeof(struct extendedFileEntry));
1776 efe->objectSize = cpu_to_le64(inode->i_size);
1777 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1778
1779 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1780 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1781 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1782 iinfo->i_crtime = inode->i_atime;
1783
1784 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1785 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1786 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1787 iinfo->i_crtime = inode->i_mtime;
1788
1789 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1790 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1791 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1792 iinfo->i_crtime = inode->i_ctime;
1793
1794 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1795 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1796 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1797 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1798
1799 memset(&(efe->impIdent), 0, sizeof(struct regid));
1800 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1801 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1802 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1803 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1804 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1805 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1806 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1807 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1808 crclen = sizeof(struct extendedFileEntry);
1809 }
1810
1811 finish:
1812 if (iinfo->i_strat4096) {
1813 fe->icbTag.strategyType = cpu_to_le16(4096);
1814 fe->icbTag.strategyParameter = cpu_to_le16(1);
1815 fe->icbTag.numEntries = cpu_to_le16(2);
1816 } else {
1817 fe->icbTag.strategyType = cpu_to_le16(4);
1818 fe->icbTag.numEntries = cpu_to_le16(1);
1819 }
1820
1821 if (iinfo->i_use)
1822 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1823 else if (S_ISDIR(inode->i_mode))
1824 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1825 else if (S_ISREG(inode->i_mode))
1826 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1827 else if (S_ISLNK(inode->i_mode))
1828 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1829 else if (S_ISBLK(inode->i_mode))
1830 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1831 else if (S_ISCHR(inode->i_mode))
1832 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1833 else if (S_ISFIFO(inode->i_mode))
1834 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1835 else if (S_ISSOCK(inode->i_mode))
1836 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1837
1838 icbflags = iinfo->i_alloc_type |
1839 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1840 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1841 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1842 (le16_to_cpu(fe->icbTag.flags) &
1843 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1844 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1845
1846 fe->icbTag.flags = cpu_to_le16(icbflags);
1847 if (sbi->s_udfrev >= 0x0200)
1848 fe->descTag.descVersion = cpu_to_le16(3);
1849 else
1850 fe->descTag.descVersion = cpu_to_le16(2);
1851 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1852 fe->descTag.tagLocation = cpu_to_le32(
1853 iinfo->i_location.logicalBlockNum);
1854 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1855 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1856 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1857 crclen));
1858 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1859
1860 set_buffer_uptodate(bh);
1861 unlock_buffer(bh);
1862
1863 /* write the data blocks */
1864 mark_buffer_dirty(bh);
1865 if (do_sync) {
1866 sync_dirty_buffer(bh);
1867 if (buffer_write_io_error(bh)) {
1868 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1869 inode->i_ino);
1870 err = -EIO;
1871 }
1872 }
1873 brelse(bh);
1874
1875 return err;
1876 }
1877
1878 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1879 bool hidden_inode)
1880 {
1881 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1882 struct inode *inode = iget_locked(sb, block);
1883 int err;
1884
1885 if (!inode)
1886 return ERR_PTR(-ENOMEM);
1887
1888 if (!(inode->i_state & I_NEW))
1889 return inode;
1890
1891 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1892 err = udf_read_inode(inode, hidden_inode);
1893 if (err < 0) {
1894 iget_failed(inode);
1895 return ERR_PTR(err);
1896 }
1897 unlock_new_inode(inode);
1898
1899 return inode;
1900 }
1901
1902 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1903 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1904 {
1905 int adsize;
1906 struct short_ad *sad = NULL;
1907 struct long_ad *lad = NULL;
1908 struct allocExtDesc *aed;
1909 uint8_t *ptr;
1910 struct udf_inode_info *iinfo = UDF_I(inode);
1911
1912 if (!epos->bh)
1913 ptr = iinfo->i_ext.i_data + epos->offset -
1914 udf_file_entry_alloc_offset(inode) +
1915 iinfo->i_lenEAttr;
1916 else
1917 ptr = epos->bh->b_data + epos->offset;
1918
1919 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1920 adsize = sizeof(struct short_ad);
1921 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1922 adsize = sizeof(struct long_ad);
1923 else
1924 return -EIO;
1925
1926 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1927 unsigned char *sptr, *dptr;
1928 struct buffer_head *nbh;
1929 int err, loffset;
1930 struct kernel_lb_addr obloc = epos->block;
1931
1932 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1933 obloc.partitionReferenceNum,
1934 obloc.logicalBlockNum, &err);
1935 if (!epos->block.logicalBlockNum)
1936 return -ENOSPC;
1937 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1938 &epos->block,
1939 0));
1940 if (!nbh)
1941 return -EIO;
1942 lock_buffer(nbh);
1943 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1944 set_buffer_uptodate(nbh);
1945 unlock_buffer(nbh);
1946 mark_buffer_dirty_inode(nbh, inode);
1947
1948 aed = (struct allocExtDesc *)(nbh->b_data);
1949 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1950 aed->previousAllocExtLocation =
1951 cpu_to_le32(obloc.logicalBlockNum);
1952 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1953 loffset = epos->offset;
1954 aed->lengthAllocDescs = cpu_to_le32(adsize);
1955 sptr = ptr - adsize;
1956 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1957 memcpy(dptr, sptr, adsize);
1958 epos->offset = sizeof(struct allocExtDesc) + adsize;
1959 } else {
1960 loffset = epos->offset + adsize;
1961 aed->lengthAllocDescs = cpu_to_le32(0);
1962 sptr = ptr;
1963 epos->offset = sizeof(struct allocExtDesc);
1964
1965 if (epos->bh) {
1966 aed = (struct allocExtDesc *)epos->bh->b_data;
1967 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1968 } else {
1969 iinfo->i_lenAlloc += adsize;
1970 mark_inode_dirty(inode);
1971 }
1972 }
1973 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1974 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1975 epos->block.logicalBlockNum, sizeof(struct tag));
1976 else
1977 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1978 epos->block.logicalBlockNum, sizeof(struct tag));
1979 switch (iinfo->i_alloc_type) {
1980 case ICBTAG_FLAG_AD_SHORT:
1981 sad = (struct short_ad *)sptr;
1982 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1983 inode->i_sb->s_blocksize);
1984 sad->extPosition =
1985 cpu_to_le32(epos->block.logicalBlockNum);
1986 break;
1987 case ICBTAG_FLAG_AD_LONG:
1988 lad = (struct long_ad *)sptr;
1989 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1990 inode->i_sb->s_blocksize);
1991 lad->extLocation = cpu_to_lelb(epos->block);
1992 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1993 break;
1994 }
1995 if (epos->bh) {
1996 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1997 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1998 udf_update_tag(epos->bh->b_data, loffset);
1999 else
2000 udf_update_tag(epos->bh->b_data,
2001 sizeof(struct allocExtDesc));
2002 mark_buffer_dirty_inode(epos->bh, inode);
2003 brelse(epos->bh);
2004 } else {
2005 mark_inode_dirty(inode);
2006 }
2007 epos->bh = nbh;
2008 }
2009
2010 udf_write_aext(inode, epos, eloc, elen, inc);
2011
2012 if (!epos->bh) {
2013 iinfo->i_lenAlloc += adsize;
2014 mark_inode_dirty(inode);
2015 } else {
2016 aed = (struct allocExtDesc *)epos->bh->b_data;
2017 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2018 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2019 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2020 udf_update_tag(epos->bh->b_data,
2021 epos->offset + (inc ? 0 : adsize));
2022 else
2023 udf_update_tag(epos->bh->b_data,
2024 sizeof(struct allocExtDesc));
2025 mark_buffer_dirty_inode(epos->bh, inode);
2026 }
2027
2028 return 0;
2029 }
2030
2031 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2032 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2033 {
2034 int adsize;
2035 uint8_t *ptr;
2036 struct short_ad *sad;
2037 struct long_ad *lad;
2038 struct udf_inode_info *iinfo = UDF_I(inode);
2039
2040 if (!epos->bh)
2041 ptr = iinfo->i_ext.i_data + epos->offset -
2042 udf_file_entry_alloc_offset(inode) +
2043 iinfo->i_lenEAttr;
2044 else
2045 ptr = epos->bh->b_data + epos->offset;
2046
2047 switch (iinfo->i_alloc_type) {
2048 case ICBTAG_FLAG_AD_SHORT:
2049 sad = (struct short_ad *)ptr;
2050 sad->extLength = cpu_to_le32(elen);
2051 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2052 adsize = sizeof(struct short_ad);
2053 break;
2054 case ICBTAG_FLAG_AD_LONG:
2055 lad = (struct long_ad *)ptr;
2056 lad->extLength = cpu_to_le32(elen);
2057 lad->extLocation = cpu_to_lelb(*eloc);
2058 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2059 adsize = sizeof(struct long_ad);
2060 break;
2061 default:
2062 return;
2063 }
2064
2065 if (epos->bh) {
2066 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2067 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2068 struct allocExtDesc *aed =
2069 (struct allocExtDesc *)epos->bh->b_data;
2070 udf_update_tag(epos->bh->b_data,
2071 le32_to_cpu(aed->lengthAllocDescs) +
2072 sizeof(struct allocExtDesc));
2073 }
2074 mark_buffer_dirty_inode(epos->bh, inode);
2075 } else {
2076 mark_inode_dirty(inode);
2077 }
2078
2079 if (inc)
2080 epos->offset += adsize;
2081 }
2082
2083 /*
2084 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2085 * someone does some weird stuff.
2086 */
2087 #define UDF_MAX_INDIR_EXTS 16
2088
2089 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2090 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2091 {
2092 int8_t etype;
2093 unsigned int indirections = 0;
2094
2095 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2096 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2097 int block;
2098
2099 if (++indirections > UDF_MAX_INDIR_EXTS) {
2100 udf_err(inode->i_sb,
2101 "too many indirect extents in inode %lu\n",
2102 inode->i_ino);
2103 return -1;
2104 }
2105
2106 epos->block = *eloc;
2107 epos->offset = sizeof(struct allocExtDesc);
2108 brelse(epos->bh);
2109 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2110 epos->bh = udf_tread(inode->i_sb, block);
2111 if (!epos->bh) {
2112 udf_debug("reading block %d failed!\n", block);
2113 return -1;
2114 }
2115 }
2116
2117 return etype;
2118 }
2119
2120 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2121 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2122 {
2123 int alen;
2124 int8_t etype;
2125 uint8_t *ptr;
2126 struct short_ad *sad;
2127 struct long_ad *lad;
2128 struct udf_inode_info *iinfo = UDF_I(inode);
2129
2130 if (!epos->bh) {
2131 if (!epos->offset)
2132 epos->offset = udf_file_entry_alloc_offset(inode);
2133 ptr = iinfo->i_ext.i_data + epos->offset -
2134 udf_file_entry_alloc_offset(inode) +
2135 iinfo->i_lenEAttr;
2136 alen = udf_file_entry_alloc_offset(inode) +
2137 iinfo->i_lenAlloc;
2138 } else {
2139 if (!epos->offset)
2140 epos->offset = sizeof(struct allocExtDesc);
2141 ptr = epos->bh->b_data + epos->offset;
2142 alen = sizeof(struct allocExtDesc) +
2143 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2144 lengthAllocDescs);
2145 }
2146
2147 switch (iinfo->i_alloc_type) {
2148 case ICBTAG_FLAG_AD_SHORT:
2149 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2150 if (!sad)
2151 return -1;
2152 etype = le32_to_cpu(sad->extLength) >> 30;
2153 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2154 eloc->partitionReferenceNum =
2155 iinfo->i_location.partitionReferenceNum;
2156 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2157 break;
2158 case ICBTAG_FLAG_AD_LONG:
2159 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2160 if (!lad)
2161 return -1;
2162 etype = le32_to_cpu(lad->extLength) >> 30;
2163 *eloc = lelb_to_cpu(lad->extLocation);
2164 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2165 break;
2166 default:
2167 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2168 return -1;
2169 }
2170
2171 return etype;
2172 }
2173
2174 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2175 struct kernel_lb_addr neloc, uint32_t nelen)
2176 {
2177 struct kernel_lb_addr oeloc;
2178 uint32_t oelen;
2179 int8_t etype;
2180
2181 if (epos.bh)
2182 get_bh(epos.bh);
2183
2184 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2185 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2186 neloc = oeloc;
2187 nelen = (etype << 30) | oelen;
2188 }
2189 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2190 brelse(epos.bh);
2191
2192 return (nelen >> 30);
2193 }
2194
2195 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2196 struct kernel_lb_addr eloc, uint32_t elen)
2197 {
2198 struct extent_position oepos;
2199 int adsize;
2200 int8_t etype;
2201 struct allocExtDesc *aed;
2202 struct udf_inode_info *iinfo;
2203
2204 if (epos.bh) {
2205 get_bh(epos.bh);
2206 get_bh(epos.bh);
2207 }
2208
2209 iinfo = UDF_I(inode);
2210 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2211 adsize = sizeof(struct short_ad);
2212 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2213 adsize = sizeof(struct long_ad);
2214 else
2215 adsize = 0;
2216
2217 oepos = epos;
2218 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2219 return -1;
2220
2221 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2222 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2223 if (oepos.bh != epos.bh) {
2224 oepos.block = epos.block;
2225 brelse(oepos.bh);
2226 get_bh(epos.bh);
2227 oepos.bh = epos.bh;
2228 oepos.offset = epos.offset - adsize;
2229 }
2230 }
2231 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2232 elen = 0;
2233
2234 if (epos.bh != oepos.bh) {
2235 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2236 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2237 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2238 if (!oepos.bh) {
2239 iinfo->i_lenAlloc -= (adsize * 2);
2240 mark_inode_dirty(inode);
2241 } else {
2242 aed = (struct allocExtDesc *)oepos.bh->b_data;
2243 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2244 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2245 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2246 udf_update_tag(oepos.bh->b_data,
2247 oepos.offset - (2 * adsize));
2248 else
2249 udf_update_tag(oepos.bh->b_data,
2250 sizeof(struct allocExtDesc));
2251 mark_buffer_dirty_inode(oepos.bh, inode);
2252 }
2253 } else {
2254 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2255 if (!oepos.bh) {
2256 iinfo->i_lenAlloc -= adsize;
2257 mark_inode_dirty(inode);
2258 } else {
2259 aed = (struct allocExtDesc *)oepos.bh->b_data;
2260 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2261 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2262 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2263 udf_update_tag(oepos.bh->b_data,
2264 epos.offset - adsize);
2265 else
2266 udf_update_tag(oepos.bh->b_data,
2267 sizeof(struct allocExtDesc));
2268 mark_buffer_dirty_inode(oepos.bh, inode);
2269 }
2270 }
2271
2272 brelse(epos.bh);
2273 brelse(oepos.bh);
2274
2275 return (elen >> 30);
2276 }
2277
2278 int8_t inode_bmap(struct inode *inode, sector_t block,
2279 struct extent_position *pos, struct kernel_lb_addr *eloc,
2280 uint32_t *elen, sector_t *offset)
2281 {
2282 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2283 loff_t lbcount = 0, bcount =
2284 (loff_t) block << blocksize_bits;
2285 int8_t etype;
2286 struct udf_inode_info *iinfo;
2287
2288 iinfo = UDF_I(inode);
2289 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2290 pos->offset = 0;
2291 pos->block = iinfo->i_location;
2292 pos->bh = NULL;
2293 }
2294 *elen = 0;
2295 do {
2296 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2297 if (etype == -1) {
2298 *offset = (bcount - lbcount) >> blocksize_bits;
2299 iinfo->i_lenExtents = lbcount;
2300 return -1;
2301 }
2302 lbcount += *elen;
2303 } while (lbcount <= bcount);
2304 /* update extent cache */
2305 udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2306 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2307
2308 return etype;
2309 }
2310
2311 long udf_block_map(struct inode *inode, sector_t block)
2312 {
2313 struct kernel_lb_addr eloc;
2314 uint32_t elen;
2315 sector_t offset;
2316 struct extent_position epos = {};
2317 int ret;
2318
2319 down_read(&UDF_I(inode)->i_data_sem);
2320
2321 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2322 (EXT_RECORDED_ALLOCATED >> 30))
2323 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2324 else
2325 ret = 0;
2326
2327 up_read(&UDF_I(inode)->i_data_sem);
2328 brelse(epos.bh);
2329
2330 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2331 return udf_fixed_to_variable(ret);
2332 else
2333 return ret;
2334 }
Linux with added FPC-III support