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
__udf_clear_extent_cache(struct inode * inode)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 */
udf_clear_extent_cache(struct inode * inode)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 */
udf_read_extent_cache(struct inode * inode,loff_t bcount,loff_t * lbcount,struct extent_position * pos)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 */
udf_update_extent_cache(struct inode * inode,loff_t estart,struct extent_position * pos)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
udf_evict_inode(struct inode * inode)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
udf_write_failed(struct address_space * mapping,loff_t to)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
udf_adinicb_writepage(struct folio * folio,struct writeback_control * wbc,void * data)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
udf_writepages(struct address_space * mapping,struct writeback_control * wbc)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
udf_adinicb_readpage(struct page * page)211 static void udf_adinicb_readpage(struct page *page)
212 {
213 struct inode *inode = page->mapping->host;
214 char *kaddr;
215 struct udf_inode_info *iinfo = UDF_I(inode);
216 loff_t isize = i_size_read(inode);
217
218 kaddr = kmap_local_page(page);
219 memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr, isize);
220 memset(kaddr + isize, 0, PAGE_SIZE - isize);
221 flush_dcache_page(page);
222 SetPageUptodate(page);
223 kunmap_local(kaddr);
224 }
225
udf_read_folio(struct file * file,struct folio * folio)226 static int udf_read_folio(struct file *file, struct folio *folio)
227 {
228 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
229
230 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
231 udf_adinicb_readpage(&folio->page);
232 folio_unlock(folio);
233 return 0;
234 }
235 return mpage_read_folio(folio, udf_get_block);
236 }
237
udf_readahead(struct readahead_control * rac)238 static void udf_readahead(struct readahead_control *rac)
239 {
240 struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
241
242 /*
243 * No readahead needed for in-ICB files and udf_get_block() would get
244 * confused for such file anyway.
245 */
246 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
247 return;
248
249 mpage_readahead(rac, udf_get_block);
250 }
251
udf_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)252 static int udf_write_begin(struct file *file, struct address_space *mapping,
253 loff_t pos, unsigned len,
254 struct page **pagep, void **fsdata)
255 {
256 struct udf_inode_info *iinfo = UDF_I(file_inode(file));
257 struct page *page;
258 int ret;
259
260 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
261 ret = block_write_begin(mapping, pos, len, pagep,
262 udf_get_block);
263 if (unlikely(ret))
264 udf_write_failed(mapping, pos + len);
265 return ret;
266 }
267 if (WARN_ON_ONCE(pos >= PAGE_SIZE))
268 return -EIO;
269 page = grab_cache_page_write_begin(mapping, 0);
270 if (!page)
271 return -ENOMEM;
272 *pagep = page;
273 if (!PageUptodate(page))
274 udf_adinicb_readpage(page);
275 return 0;
276 }
277
udf_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct page * page,void * fsdata)278 static int udf_write_end(struct file *file, struct address_space *mapping,
279 loff_t pos, unsigned len, unsigned copied,
280 struct page *page, void *fsdata)
281 {
282 struct inode *inode = file_inode(file);
283 loff_t last_pos;
284
285 if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
286 return generic_write_end(file, mapping, pos, len, copied, page,
287 fsdata);
288 last_pos = pos + copied;
289 if (last_pos > inode->i_size)
290 i_size_write(inode, last_pos);
291 set_page_dirty(page);
292 unlock_page(page);
293 put_page(page);
294
295 return copied;
296 }
297
udf_direct_IO(struct kiocb * iocb,struct iov_iter * iter)298 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
299 {
300 struct file *file = iocb->ki_filp;
301 struct address_space *mapping = file->f_mapping;
302 struct inode *inode = mapping->host;
303 size_t count = iov_iter_count(iter);
304 ssize_t ret;
305
306 /* Fallback to buffered IO for in-ICB files */
307 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
308 return 0;
309 ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
310 if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
311 udf_write_failed(mapping, iocb->ki_pos + count);
312 return ret;
313 }
314
udf_bmap(struct address_space * mapping,sector_t block)315 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
316 {
317 struct udf_inode_info *iinfo = UDF_I(mapping->host);
318
319 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
320 return -EINVAL;
321 return generic_block_bmap(mapping, block, udf_get_block);
322 }
323
324 const struct address_space_operations udf_aops = {
325 .dirty_folio = block_dirty_folio,
326 .invalidate_folio = block_invalidate_folio,
327 .read_folio = udf_read_folio,
328 .readahead = udf_readahead,
329 .writepages = udf_writepages,
330 .write_begin = udf_write_begin,
331 .write_end = udf_write_end,
332 .direct_IO = udf_direct_IO,
333 .bmap = udf_bmap,
334 .migrate_folio = buffer_migrate_folio,
335 };
336
337 /*
338 * Expand file stored in ICB to a normal one-block-file
339 *
340 * This function requires i_mutex held
341 */
udf_expand_file_adinicb(struct inode * inode)342 int udf_expand_file_adinicb(struct inode *inode)
343 {
344 struct page *page;
345 struct udf_inode_info *iinfo = UDF_I(inode);
346 int err;
347
348 WARN_ON_ONCE(!inode_is_locked(inode));
349 if (!iinfo->i_lenAlloc) {
350 down_write(&iinfo->i_data_sem);
351 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
352 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
353 else
354 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
355 up_write(&iinfo->i_data_sem);
356 mark_inode_dirty(inode);
357 return 0;
358 }
359
360 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
361 if (!page)
362 return -ENOMEM;
363
364 if (!PageUptodate(page))
365 udf_adinicb_readpage(page);
366 down_write(&iinfo->i_data_sem);
367 memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
368 iinfo->i_lenAlloc);
369 iinfo->i_lenAlloc = 0;
370 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
371 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
372 else
373 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
374 set_page_dirty(page);
375 unlock_page(page);
376 up_write(&iinfo->i_data_sem);
377 err = filemap_fdatawrite(inode->i_mapping);
378 if (err) {
379 /* Restore everything back so that we don't lose data... */
380 lock_page(page);
381 down_write(&iinfo->i_data_sem);
382 memcpy_to_page(page, 0, iinfo->i_data + iinfo->i_lenEAttr,
383 inode->i_size);
384 unlock_page(page);
385 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
386 iinfo->i_lenAlloc = inode->i_size;
387 up_write(&iinfo->i_data_sem);
388 }
389 put_page(page);
390 mark_inode_dirty(inode);
391
392 return err;
393 }
394
395 #define UDF_MAP_CREATE 0x01 /* Mapping can allocate new blocks */
396 #define UDF_MAP_NOPREALLOC 0x02 /* Do not preallocate blocks */
397
398 #define UDF_BLK_MAPPED 0x01 /* Block was successfully mapped */
399 #define UDF_BLK_NEW 0x02 /* Block was freshly allocated */
400
401 struct udf_map_rq {
402 sector_t lblk;
403 udf_pblk_t pblk;
404 int iflags; /* UDF_MAP_ flags determining behavior */
405 int oflags; /* UDF_BLK_ flags reporting results */
406 };
407
udf_map_block(struct inode * inode,struct udf_map_rq * map)408 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
409 {
410 int err;
411 struct udf_inode_info *iinfo = UDF_I(inode);
412
413 if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
414 return -EFSCORRUPTED;
415
416 map->oflags = 0;
417 if (!(map->iflags & UDF_MAP_CREATE)) {
418 struct kernel_lb_addr eloc;
419 uint32_t elen;
420 sector_t offset;
421 struct extent_position epos = {};
422
423 down_read(&iinfo->i_data_sem);
424 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
425 == (EXT_RECORDED_ALLOCATED >> 30)) {
426 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
427 offset);
428 map->oflags |= UDF_BLK_MAPPED;
429 }
430 up_read(&iinfo->i_data_sem);
431 brelse(epos.bh);
432
433 return 0;
434 }
435
436 down_write(&iinfo->i_data_sem);
437 /*
438 * Block beyond EOF and prealloc extents? Just discard preallocation
439 * as it is not useful and complicates things.
440 */
441 if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
442 udf_discard_prealloc(inode);
443 udf_clear_extent_cache(inode);
444 err = inode_getblk(inode, map);
445 up_write(&iinfo->i_data_sem);
446 return err;
447 }
448
__udf_get_block(struct inode * inode,sector_t block,struct buffer_head * bh_result,int flags)449 static int __udf_get_block(struct inode *inode, sector_t block,
450 struct buffer_head *bh_result, int flags)
451 {
452 int err;
453 struct udf_map_rq map = {
454 .lblk = block,
455 .iflags = flags,
456 };
457
458 err = udf_map_block(inode, &map);
459 if (err < 0)
460 return err;
461 if (map.oflags & UDF_BLK_MAPPED) {
462 map_bh(bh_result, inode->i_sb, map.pblk);
463 if (map.oflags & UDF_BLK_NEW)
464 set_buffer_new(bh_result);
465 }
466 return 0;
467 }
468
udf_get_block(struct inode * inode,sector_t block,struct buffer_head * bh_result,int create)469 int udf_get_block(struct inode *inode, sector_t block,
470 struct buffer_head *bh_result, int create)
471 {
472 int flags = create ? UDF_MAP_CREATE : 0;
473
474 /*
475 * We preallocate blocks only for regular files. It also makes sense
476 * for directories but there's a problem when to drop the
477 * preallocation. We might use some delayed work for that but I feel
478 * it's overengineering for a filesystem like UDF.
479 */
480 if (!S_ISREG(inode->i_mode))
481 flags |= UDF_MAP_NOPREALLOC;
482 return __udf_get_block(inode, block, bh_result, flags);
483 }
484
485 /*
486 * We shouldn't be allocating blocks on page writeback since we allocate them
487 * on page fault. We can spot dirty buffers without allocated blocks though
488 * when truncate expands file. These however don't have valid data so we can
489 * safely ignore them. So never allocate blocks from page writeback.
490 */
udf_get_block_wb(struct inode * inode,sector_t block,struct buffer_head * bh_result,int create)491 static int udf_get_block_wb(struct inode *inode, sector_t block,
492 struct buffer_head *bh_result, int create)
493 {
494 return __udf_get_block(inode, block, bh_result, 0);
495 }
496
497 /* Extend the file with new blocks totaling 'new_block_bytes',
498 * return the number of extents added
499 */
udf_do_extend_file(struct inode * inode,struct extent_position * last_pos,struct kernel_long_ad * last_ext,loff_t new_block_bytes)500 static int udf_do_extend_file(struct inode *inode,
501 struct extent_position *last_pos,
502 struct kernel_long_ad *last_ext,
503 loff_t new_block_bytes)
504 {
505 uint32_t add;
506 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
507 struct super_block *sb = inode->i_sb;
508 struct udf_inode_info *iinfo;
509 int err;
510
511 /* The previous extent is fake and we should not extend by anything
512 * - there's nothing to do... */
513 if (!new_block_bytes && fake)
514 return 0;
515
516 iinfo = UDF_I(inode);
517 /* Round the last extent up to a multiple of block size */
518 if (last_ext->extLength & (sb->s_blocksize - 1)) {
519 last_ext->extLength =
520 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
521 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
522 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
523 iinfo->i_lenExtents =
524 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
525 ~(sb->s_blocksize - 1);
526 }
527
528 add = 0;
529 /* Can we merge with the previous extent? */
530 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
531 EXT_NOT_RECORDED_NOT_ALLOCATED) {
532 add = (1 << 30) - sb->s_blocksize -
533 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
534 if (add > new_block_bytes)
535 add = new_block_bytes;
536 new_block_bytes -= add;
537 last_ext->extLength += add;
538 }
539
540 if (fake) {
541 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
542 last_ext->extLength, 1);
543 if (err < 0)
544 goto out_err;
545 count++;
546 } else {
547 struct kernel_lb_addr tmploc;
548 uint32_t tmplen;
549
550 udf_write_aext(inode, last_pos, &last_ext->extLocation,
551 last_ext->extLength, 1);
552
553 /*
554 * We've rewritten the last extent. If we are going to add
555 * more extents, we may need to enter possible following
556 * empty indirect extent.
557 */
558 if (new_block_bytes)
559 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
560 }
561 iinfo->i_lenExtents += add;
562
563 /* Managed to do everything necessary? */
564 if (!new_block_bytes)
565 goto out;
566
567 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
568 last_ext->extLocation.logicalBlockNum = 0;
569 last_ext->extLocation.partitionReferenceNum = 0;
570 add = (1 << 30) - sb->s_blocksize;
571 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
572
573 /* Create enough extents to cover the whole hole */
574 while (new_block_bytes > add) {
575 new_block_bytes -= add;
576 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
577 last_ext->extLength, 1);
578 if (err)
579 goto out_err;
580 iinfo->i_lenExtents += add;
581 count++;
582 }
583 if (new_block_bytes) {
584 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
585 new_block_bytes;
586 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
587 last_ext->extLength, 1);
588 if (err)
589 goto out_err;
590 iinfo->i_lenExtents += new_block_bytes;
591 count++;
592 }
593
594 out:
595 /* last_pos should point to the last written extent... */
596 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
597 last_pos->offset -= sizeof(struct short_ad);
598 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
599 last_pos->offset -= sizeof(struct long_ad);
600 else
601 return -EIO;
602
603 return count;
604 out_err:
605 /* Remove extents we've created so far */
606 udf_clear_extent_cache(inode);
607 udf_truncate_extents(inode);
608 return err;
609 }
610
611 /* Extend the final block of the file to final_block_len bytes */
udf_do_extend_final_block(struct inode * inode,struct extent_position * last_pos,struct kernel_long_ad * last_ext,uint32_t new_elen)612 static void udf_do_extend_final_block(struct inode *inode,
613 struct extent_position *last_pos,
614 struct kernel_long_ad *last_ext,
615 uint32_t new_elen)
616 {
617 uint32_t added_bytes;
618
619 /*
620 * Extent already large enough? It may be already rounded up to block
621 * size...
622 */
623 if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
624 return;
625 added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
626 last_ext->extLength += added_bytes;
627 UDF_I(inode)->i_lenExtents += added_bytes;
628
629 udf_write_aext(inode, last_pos, &last_ext->extLocation,
630 last_ext->extLength, 1);
631 }
632
udf_extend_file(struct inode * inode,loff_t newsize)633 static int udf_extend_file(struct inode *inode, loff_t newsize)
634 {
635
636 struct extent_position epos;
637 struct kernel_lb_addr eloc;
638 uint32_t elen;
639 int8_t etype;
640 struct super_block *sb = inode->i_sb;
641 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
642 loff_t new_elen;
643 int adsize;
644 struct udf_inode_info *iinfo = UDF_I(inode);
645 struct kernel_long_ad extent;
646 int err = 0;
647 bool within_last_ext;
648
649 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
650 adsize = sizeof(struct short_ad);
651 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
652 adsize = sizeof(struct long_ad);
653 else
654 BUG();
655
656 down_write(&iinfo->i_data_sem);
657 /*
658 * When creating hole in file, just don't bother with preserving
659 * preallocation. It likely won't be very useful anyway.
660 */
661 udf_discard_prealloc(inode);
662
663 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
664 within_last_ext = (etype != -1);
665 /* We don't expect extents past EOF... */
666 WARN_ON_ONCE(within_last_ext &&
667 elen > ((loff_t)offset + 1) << inode->i_blkbits);
668
669 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
670 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
671 /* File has no extents at all or has empty last
672 * indirect extent! Create a fake extent... */
673 extent.extLocation.logicalBlockNum = 0;
674 extent.extLocation.partitionReferenceNum = 0;
675 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
676 } else {
677 epos.offset -= adsize;
678 etype = udf_next_aext(inode, &epos, &extent.extLocation,
679 &extent.extLength, 0);
680 extent.extLength |= etype << 30;
681 }
682
683 new_elen = ((loff_t)offset << inode->i_blkbits) |
684 (newsize & (sb->s_blocksize - 1));
685
686 /* File has extent covering the new size (could happen when extending
687 * inside a block)?
688 */
689 if (within_last_ext) {
690 /* Extending file within the last file block */
691 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
692 } else {
693 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
694 }
695
696 if (err < 0)
697 goto out;
698 err = 0;
699 out:
700 brelse(epos.bh);
701 up_write(&iinfo->i_data_sem);
702 return err;
703 }
704
inode_getblk(struct inode * inode,struct udf_map_rq * map)705 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
706 {
707 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
708 struct extent_position prev_epos, cur_epos, next_epos;
709 int count = 0, startnum = 0, endnum = 0;
710 uint32_t elen = 0, tmpelen;
711 struct kernel_lb_addr eloc, tmpeloc;
712 int c = 1;
713 loff_t lbcount = 0, b_off = 0;
714 udf_pblk_t newblocknum;
715 sector_t offset = 0;
716 int8_t etype;
717 struct udf_inode_info *iinfo = UDF_I(inode);
718 udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
719 int lastblock = 0;
720 bool isBeyondEOF;
721 int ret = 0;
722
723 prev_epos.offset = udf_file_entry_alloc_offset(inode);
724 prev_epos.block = iinfo->i_location;
725 prev_epos.bh = NULL;
726 cur_epos = next_epos = prev_epos;
727 b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
728
729 /* find the extent which contains the block we are looking for.
730 alternate between laarr[0] and laarr[1] for locations of the
731 current extent, and the previous extent */
732 do {
733 if (prev_epos.bh != cur_epos.bh) {
734 brelse(prev_epos.bh);
735 get_bh(cur_epos.bh);
736 prev_epos.bh = cur_epos.bh;
737 }
738 if (cur_epos.bh != next_epos.bh) {
739 brelse(cur_epos.bh);
740 get_bh(next_epos.bh);
741 cur_epos.bh = next_epos.bh;
742 }
743
744 lbcount += elen;
745
746 prev_epos.block = cur_epos.block;
747 cur_epos.block = next_epos.block;
748
749 prev_epos.offset = cur_epos.offset;
750 cur_epos.offset = next_epos.offset;
751
752 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
753 if (etype == -1)
754 break;
755
756 c = !c;
757
758 laarr[c].extLength = (etype << 30) | elen;
759 laarr[c].extLocation = eloc;
760
761 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
762 pgoal = eloc.logicalBlockNum +
763 ((elen + inode->i_sb->s_blocksize - 1) >>
764 inode->i_sb->s_blocksize_bits);
765
766 count++;
767 } while (lbcount + elen <= b_off);
768
769 b_off -= lbcount;
770 offset = b_off >> inode->i_sb->s_blocksize_bits;
771 /*
772 * Move prev_epos and cur_epos into indirect extent if we are at
773 * the pointer to it
774 */
775 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
776 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
777
778 /* if the extent is allocated and recorded, return the block
779 if the extent is not a multiple of the blocksize, round up */
780
781 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
782 if (elen & (inode->i_sb->s_blocksize - 1)) {
783 elen = EXT_RECORDED_ALLOCATED |
784 ((elen + inode->i_sb->s_blocksize - 1) &
785 ~(inode->i_sb->s_blocksize - 1));
786 iinfo->i_lenExtents =
787 ALIGN(iinfo->i_lenExtents,
788 inode->i_sb->s_blocksize);
789 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
790 }
791 map->oflags = UDF_BLK_MAPPED;
792 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
793 goto out_free;
794 }
795
796 /* Are we beyond EOF and preallocated extent? */
797 if (etype == -1) {
798 loff_t hole_len;
799
800 isBeyondEOF = true;
801 if (count) {
802 if (c)
803 laarr[0] = laarr[1];
804 startnum = 1;
805 } else {
806 /* Create a fake extent when there's not one */
807 memset(&laarr[0].extLocation, 0x00,
808 sizeof(struct kernel_lb_addr));
809 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
810 /* Will udf_do_extend_file() create real extent from
811 a fake one? */
812 startnum = (offset > 0);
813 }
814 /* Create extents for the hole between EOF and offset */
815 hole_len = (loff_t)offset << inode->i_blkbits;
816 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
817 if (ret < 0)
818 goto out_free;
819 c = 0;
820 offset = 0;
821 count += ret;
822 /*
823 * Is there any real extent? - otherwise we overwrite the fake
824 * one...
825 */
826 if (count)
827 c = !c;
828 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
829 inode->i_sb->s_blocksize;
830 memset(&laarr[c].extLocation, 0x00,
831 sizeof(struct kernel_lb_addr));
832 count++;
833 endnum = c + 1;
834 lastblock = 1;
835 } else {
836 isBeyondEOF = false;
837 endnum = startnum = ((count > 2) ? 2 : count);
838
839 /* if the current extent is in position 0,
840 swap it with the previous */
841 if (!c && count != 1) {
842 laarr[2] = laarr[0];
843 laarr[0] = laarr[1];
844 laarr[1] = laarr[2];
845 c = 1;
846 }
847
848 /* if the current block is located in an extent,
849 read the next extent */
850 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
851 if (etype != -1) {
852 laarr[c + 1].extLength = (etype << 30) | elen;
853 laarr[c + 1].extLocation = eloc;
854 count++;
855 startnum++;
856 endnum++;
857 } else
858 lastblock = 1;
859 }
860
861 /* if the current extent is not recorded but allocated, get the
862 * block in the extent corresponding to the requested block */
863 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
864 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
865 else { /* otherwise, allocate a new block */
866 if (iinfo->i_next_alloc_block == map->lblk)
867 goal = iinfo->i_next_alloc_goal;
868
869 if (!goal) {
870 if (!(goal = pgoal)) /* XXX: what was intended here? */
871 goal = iinfo->i_location.logicalBlockNum + 1;
872 }
873
874 newblocknum = udf_new_block(inode->i_sb, inode,
875 iinfo->i_location.partitionReferenceNum,
876 goal, &ret);
877 if (!newblocknum)
878 goto out_free;
879 if (isBeyondEOF)
880 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
881 }
882
883 /* if the extent the requsted block is located in contains multiple
884 * blocks, split the extent into at most three extents. blocks prior
885 * to requested block, requested block, and blocks after requested
886 * block */
887 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
888
889 if (!(map->iflags & UDF_MAP_NOPREALLOC))
890 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
891
892 /* merge any continuous blocks in laarr */
893 udf_merge_extents(inode, laarr, &endnum);
894
895 /* write back the new extents, inserting new extents if the new number
896 * of extents is greater than the old number, and deleting extents if
897 * the new number of extents is less than the old number */
898 ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
899 if (ret < 0)
900 goto out_free;
901
902 map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
903 iinfo->i_location.partitionReferenceNum, 0);
904 if (!map->pblk) {
905 ret = -EFSCORRUPTED;
906 goto out_free;
907 }
908 map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
909 iinfo->i_next_alloc_block = map->lblk + 1;
910 iinfo->i_next_alloc_goal = newblocknum + 1;
911 inode_set_ctime_current(inode);
912
913 if (IS_SYNC(inode))
914 udf_sync_inode(inode);
915 else
916 mark_inode_dirty(inode);
917 ret = 0;
918 out_free:
919 brelse(prev_epos.bh);
920 brelse(cur_epos.bh);
921 brelse(next_epos.bh);
922 return ret;
923 }
924
udf_split_extents(struct inode * inode,int * c,int offset,udf_pblk_t newblocknum,struct kernel_long_ad * laarr,int * endnum)925 static void udf_split_extents(struct inode *inode, int *c, int offset,
926 udf_pblk_t newblocknum,
927 struct kernel_long_ad *laarr, int *endnum)
928 {
929 unsigned long blocksize = inode->i_sb->s_blocksize;
930 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
931
932 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
933 (laarr[*c].extLength >> 30) ==
934 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
935 int curr = *c;
936 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
937 blocksize - 1) >> blocksize_bits;
938 int8_t etype = (laarr[curr].extLength >> 30);
939
940 if (blen == 1)
941 ;
942 else if (!offset || blen == offset + 1) {
943 laarr[curr + 2] = laarr[curr + 1];
944 laarr[curr + 1] = laarr[curr];
945 } else {
946 laarr[curr + 3] = laarr[curr + 1];
947 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
948 }
949
950 if (offset) {
951 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
952 udf_free_blocks(inode->i_sb, inode,
953 &laarr[curr].extLocation,
954 0, offset);
955 laarr[curr].extLength =
956 EXT_NOT_RECORDED_NOT_ALLOCATED |
957 (offset << blocksize_bits);
958 laarr[curr].extLocation.logicalBlockNum = 0;
959 laarr[curr].extLocation.
960 partitionReferenceNum = 0;
961 } else
962 laarr[curr].extLength = (etype << 30) |
963 (offset << blocksize_bits);
964 curr++;
965 (*c)++;
966 (*endnum)++;
967 }
968
969 laarr[curr].extLocation.logicalBlockNum = newblocknum;
970 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
971 laarr[curr].extLocation.partitionReferenceNum =
972 UDF_I(inode)->i_location.partitionReferenceNum;
973 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
974 blocksize;
975 curr++;
976
977 if (blen != offset + 1) {
978 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
979 laarr[curr].extLocation.logicalBlockNum +=
980 offset + 1;
981 laarr[curr].extLength = (etype << 30) |
982 ((blen - (offset + 1)) << blocksize_bits);
983 curr++;
984 (*endnum)++;
985 }
986 }
987 }
988
udf_prealloc_extents(struct inode * inode,int c,int lastblock,struct kernel_long_ad * laarr,int * endnum)989 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
990 struct kernel_long_ad *laarr,
991 int *endnum)
992 {
993 int start, length = 0, currlength = 0, i;
994
995 if (*endnum >= (c + 1)) {
996 if (!lastblock)
997 return;
998 else
999 start = c;
1000 } else {
1001 if ((laarr[c + 1].extLength >> 30) ==
1002 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1003 start = c + 1;
1004 length = currlength =
1005 (((laarr[c + 1].extLength &
1006 UDF_EXTENT_LENGTH_MASK) +
1007 inode->i_sb->s_blocksize - 1) >>
1008 inode->i_sb->s_blocksize_bits);
1009 } else
1010 start = c;
1011 }
1012
1013 for (i = start + 1; i <= *endnum; i++) {
1014 if (i == *endnum) {
1015 if (lastblock)
1016 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1017 } else if ((laarr[i].extLength >> 30) ==
1018 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1019 length += (((laarr[i].extLength &
1020 UDF_EXTENT_LENGTH_MASK) +
1021 inode->i_sb->s_blocksize - 1) >>
1022 inode->i_sb->s_blocksize_bits);
1023 } else
1024 break;
1025 }
1026
1027 if (length) {
1028 int next = laarr[start].extLocation.logicalBlockNum +
1029 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1030 inode->i_sb->s_blocksize - 1) >>
1031 inode->i_sb->s_blocksize_bits);
1032 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1033 laarr[start].extLocation.partitionReferenceNum,
1034 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1035 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1036 currlength);
1037 if (numalloc) {
1038 if (start == (c + 1))
1039 laarr[start].extLength +=
1040 (numalloc <<
1041 inode->i_sb->s_blocksize_bits);
1042 else {
1043 memmove(&laarr[c + 2], &laarr[c + 1],
1044 sizeof(struct long_ad) * (*endnum - (c + 1)));
1045 (*endnum)++;
1046 laarr[c + 1].extLocation.logicalBlockNum = next;
1047 laarr[c + 1].extLocation.partitionReferenceNum =
1048 laarr[c].extLocation.
1049 partitionReferenceNum;
1050 laarr[c + 1].extLength =
1051 EXT_NOT_RECORDED_ALLOCATED |
1052 (numalloc <<
1053 inode->i_sb->s_blocksize_bits);
1054 start = c + 1;
1055 }
1056
1057 for (i = start + 1; numalloc && i < *endnum; i++) {
1058 int elen = ((laarr[i].extLength &
1059 UDF_EXTENT_LENGTH_MASK) +
1060 inode->i_sb->s_blocksize - 1) >>
1061 inode->i_sb->s_blocksize_bits;
1062
1063 if (elen > numalloc) {
1064 laarr[i].extLength -=
1065 (numalloc <<
1066 inode->i_sb->s_blocksize_bits);
1067 numalloc = 0;
1068 } else {
1069 numalloc -= elen;
1070 if (*endnum > (i + 1))
1071 memmove(&laarr[i],
1072 &laarr[i + 1],
1073 sizeof(struct long_ad) *
1074 (*endnum - (i + 1)));
1075 i--;
1076 (*endnum)--;
1077 }
1078 }
1079 UDF_I(inode)->i_lenExtents +=
1080 numalloc << inode->i_sb->s_blocksize_bits;
1081 }
1082 }
1083 }
1084
udf_merge_extents(struct inode * inode,struct kernel_long_ad * laarr,int * endnum)1085 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1086 int *endnum)
1087 {
1088 int i;
1089 unsigned long blocksize = inode->i_sb->s_blocksize;
1090 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1091
1092 for (i = 0; i < (*endnum - 1); i++) {
1093 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1094 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1095
1096 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1097 (((li->extLength >> 30) ==
1098 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1099 ((lip1->extLocation.logicalBlockNum -
1100 li->extLocation.logicalBlockNum) ==
1101 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1102 blocksize - 1) >> blocksize_bits)))) {
1103
1104 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1105 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1106 blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1107 li->extLength = lip1->extLength +
1108 (((li->extLength &
1109 UDF_EXTENT_LENGTH_MASK) +
1110 blocksize - 1) & ~(blocksize - 1));
1111 if (*endnum > (i + 2))
1112 memmove(&laarr[i + 1], &laarr[i + 2],
1113 sizeof(struct long_ad) *
1114 (*endnum - (i + 2)));
1115 i--;
1116 (*endnum)--;
1117 }
1118 } else if (((li->extLength >> 30) ==
1119 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1120 ((lip1->extLength >> 30) ==
1121 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1122 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1123 ((li->extLength &
1124 UDF_EXTENT_LENGTH_MASK) +
1125 blocksize - 1) >> blocksize_bits);
1126 li->extLocation.logicalBlockNum = 0;
1127 li->extLocation.partitionReferenceNum = 0;
1128
1129 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1130 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1131 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1132 lip1->extLength = (lip1->extLength -
1133 (li->extLength &
1134 UDF_EXTENT_LENGTH_MASK) +
1135 UDF_EXTENT_LENGTH_MASK) &
1136 ~(blocksize - 1);
1137 li->extLength = (li->extLength &
1138 UDF_EXTENT_FLAG_MASK) +
1139 (UDF_EXTENT_LENGTH_MASK + 1) -
1140 blocksize;
1141 } else {
1142 li->extLength = lip1->extLength +
1143 (((li->extLength &
1144 UDF_EXTENT_LENGTH_MASK) +
1145 blocksize - 1) & ~(blocksize - 1));
1146 if (*endnum > (i + 2))
1147 memmove(&laarr[i + 1], &laarr[i + 2],
1148 sizeof(struct long_ad) *
1149 (*endnum - (i + 2)));
1150 i--;
1151 (*endnum)--;
1152 }
1153 } else if ((li->extLength >> 30) ==
1154 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1155 udf_free_blocks(inode->i_sb, inode,
1156 &li->extLocation, 0,
1157 ((li->extLength &
1158 UDF_EXTENT_LENGTH_MASK) +
1159 blocksize - 1) >> blocksize_bits);
1160 li->extLocation.logicalBlockNum = 0;
1161 li->extLocation.partitionReferenceNum = 0;
1162 li->extLength = (li->extLength &
1163 UDF_EXTENT_LENGTH_MASK) |
1164 EXT_NOT_RECORDED_NOT_ALLOCATED;
1165 }
1166 }
1167 }
1168
udf_update_extents(struct inode * inode,struct kernel_long_ad * laarr,int startnum,int endnum,struct extent_position * epos)1169 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1170 int startnum, int endnum,
1171 struct extent_position *epos)
1172 {
1173 int start = 0, i;
1174 struct kernel_lb_addr tmploc;
1175 uint32_t tmplen;
1176 int err;
1177
1178 if (startnum > endnum) {
1179 for (i = 0; i < (startnum - endnum); i++)
1180 udf_delete_aext(inode, *epos);
1181 } else if (startnum < endnum) {
1182 for (i = 0; i < (endnum - startnum); i++) {
1183 err = udf_insert_aext(inode, *epos,
1184 laarr[i].extLocation,
1185 laarr[i].extLength);
1186 /*
1187 * If we fail here, we are likely corrupting the extent
1188 * list and leaking blocks. At least stop early to
1189 * limit the damage.
1190 */
1191 if (err < 0)
1192 return err;
1193 udf_next_aext(inode, epos, &laarr[i].extLocation,
1194 &laarr[i].extLength, 1);
1195 start++;
1196 }
1197 }
1198
1199 for (i = start; i < endnum; i++) {
1200 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1201 udf_write_aext(inode, epos, &laarr[i].extLocation,
1202 laarr[i].extLength, 1);
1203 }
1204 return 0;
1205 }
1206
udf_bread(struct inode * inode,udf_pblk_t block,int create,int * err)1207 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1208 int create, int *err)
1209 {
1210 struct buffer_head *bh = NULL;
1211 struct udf_map_rq map = {
1212 .lblk = block,
1213 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1214 };
1215
1216 *err = udf_map_block(inode, &map);
1217 if (*err || !(map.oflags & UDF_BLK_MAPPED))
1218 return NULL;
1219
1220 bh = sb_getblk(inode->i_sb, map.pblk);
1221 if (!bh) {
1222 *err = -ENOMEM;
1223 return NULL;
1224 }
1225 if (map.oflags & UDF_BLK_NEW) {
1226 lock_buffer(bh);
1227 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1228 set_buffer_uptodate(bh);
1229 unlock_buffer(bh);
1230 mark_buffer_dirty_inode(bh, inode);
1231 return bh;
1232 }
1233
1234 if (bh_read(bh, 0) >= 0)
1235 return bh;
1236
1237 brelse(bh);
1238 *err = -EIO;
1239 return NULL;
1240 }
1241
udf_setsize(struct inode * inode,loff_t newsize)1242 int udf_setsize(struct inode *inode, loff_t newsize)
1243 {
1244 int err = 0;
1245 struct udf_inode_info *iinfo;
1246 unsigned int bsize = i_blocksize(inode);
1247
1248 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1249 S_ISLNK(inode->i_mode)))
1250 return -EINVAL;
1251 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1252 return -EPERM;
1253
1254 filemap_invalidate_lock(inode->i_mapping);
1255 iinfo = UDF_I(inode);
1256 if (newsize > inode->i_size) {
1257 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1258 if (bsize >=
1259 (udf_file_entry_alloc_offset(inode) + newsize)) {
1260 down_write(&iinfo->i_data_sem);
1261 iinfo->i_lenAlloc = newsize;
1262 up_write(&iinfo->i_data_sem);
1263 goto set_size;
1264 }
1265 err = udf_expand_file_adinicb(inode);
1266 if (err)
1267 goto out_unlock;
1268 }
1269 err = udf_extend_file(inode, newsize);
1270 if (err)
1271 goto out_unlock;
1272 set_size:
1273 truncate_setsize(inode, newsize);
1274 } else {
1275 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1276 down_write(&iinfo->i_data_sem);
1277 udf_clear_extent_cache(inode);
1278 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1279 0x00, bsize - newsize -
1280 udf_file_entry_alloc_offset(inode));
1281 iinfo->i_lenAlloc = newsize;
1282 truncate_setsize(inode, newsize);
1283 up_write(&iinfo->i_data_sem);
1284 goto update_time;
1285 }
1286 err = block_truncate_page(inode->i_mapping, newsize,
1287 udf_get_block);
1288 if (err)
1289 goto out_unlock;
1290 truncate_setsize(inode, newsize);
1291 down_write(&iinfo->i_data_sem);
1292 udf_clear_extent_cache(inode);
1293 err = udf_truncate_extents(inode);
1294 up_write(&iinfo->i_data_sem);
1295 if (err)
1296 goto out_unlock;
1297 }
1298 update_time:
1299 inode->i_mtime = inode_set_ctime_current(inode);
1300 if (IS_SYNC(inode))
1301 udf_sync_inode(inode);
1302 else
1303 mark_inode_dirty(inode);
1304 out_unlock:
1305 filemap_invalidate_unlock(inode->i_mapping);
1306 return err;
1307 }
1308
1309 /*
1310 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1311 * arbitrary - just that we hopefully don't limit any real use of rewritten
1312 * inode on write-once media but avoid looping for too long on corrupted media.
1313 */
1314 #define UDF_MAX_ICB_NESTING 1024
1315
udf_read_inode(struct inode * inode,bool hidden_inode)1316 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1317 {
1318 struct buffer_head *bh = NULL;
1319 struct fileEntry *fe;
1320 struct extendedFileEntry *efe;
1321 uint16_t ident;
1322 struct udf_inode_info *iinfo = UDF_I(inode);
1323 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1324 struct kernel_lb_addr *iloc = &iinfo->i_location;
1325 unsigned int link_count;
1326 unsigned int indirections = 0;
1327 int bs = inode->i_sb->s_blocksize;
1328 int ret = -EIO;
1329 uint32_t uid, gid;
1330 struct timespec64 ctime;
1331
1332 reread:
1333 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1334 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1335 iloc->partitionReferenceNum, sbi->s_partitions);
1336 return -EIO;
1337 }
1338
1339 if (iloc->logicalBlockNum >=
1340 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1341 udf_debug("block=%u, partition=%u out of range\n",
1342 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1343 return -EIO;
1344 }
1345
1346 /*
1347 * Set defaults, but the inode is still incomplete!
1348 * Note: get_new_inode() sets the following on a new inode:
1349 * i_sb = sb
1350 * i_no = ino
1351 * i_flags = sb->s_flags
1352 * i_state = 0
1353 * clean_inode(): zero fills and sets
1354 * i_count = 1
1355 * i_nlink = 1
1356 * i_op = NULL;
1357 */
1358 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1359 if (!bh) {
1360 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1361 return -EIO;
1362 }
1363
1364 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1365 ident != TAG_IDENT_USE) {
1366 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1367 inode->i_ino, ident);
1368 goto out;
1369 }
1370
1371 fe = (struct fileEntry *)bh->b_data;
1372 efe = (struct extendedFileEntry *)bh->b_data;
1373
1374 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1375 struct buffer_head *ibh;
1376
1377 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1378 if (ident == TAG_IDENT_IE && ibh) {
1379 struct kernel_lb_addr loc;
1380 struct indirectEntry *ie;
1381
1382 ie = (struct indirectEntry *)ibh->b_data;
1383 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1384
1385 if (ie->indirectICB.extLength) {
1386 brelse(ibh);
1387 memcpy(&iinfo->i_location, &loc,
1388 sizeof(struct kernel_lb_addr));
1389 if (++indirections > UDF_MAX_ICB_NESTING) {
1390 udf_err(inode->i_sb,
1391 "too many ICBs in ICB hierarchy"
1392 " (max %d supported)\n",
1393 UDF_MAX_ICB_NESTING);
1394 goto out;
1395 }
1396 brelse(bh);
1397 goto reread;
1398 }
1399 }
1400 brelse(ibh);
1401 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1402 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1403 le16_to_cpu(fe->icbTag.strategyType));
1404 goto out;
1405 }
1406 if (fe->icbTag.strategyType == cpu_to_le16(4))
1407 iinfo->i_strat4096 = 0;
1408 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1409 iinfo->i_strat4096 = 1;
1410
1411 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1412 ICBTAG_FLAG_AD_MASK;
1413 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1414 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1415 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1416 ret = -EIO;
1417 goto out;
1418 }
1419 iinfo->i_hidden = hidden_inode;
1420 iinfo->i_unique = 0;
1421 iinfo->i_lenEAttr = 0;
1422 iinfo->i_lenExtents = 0;
1423 iinfo->i_lenAlloc = 0;
1424 iinfo->i_next_alloc_block = 0;
1425 iinfo->i_next_alloc_goal = 0;
1426 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1427 iinfo->i_efe = 1;
1428 iinfo->i_use = 0;
1429 ret = udf_alloc_i_data(inode, bs -
1430 sizeof(struct extendedFileEntry));
1431 if (ret)
1432 goto out;
1433 memcpy(iinfo->i_data,
1434 bh->b_data + sizeof(struct extendedFileEntry),
1435 bs - sizeof(struct extendedFileEntry));
1436 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1437 iinfo->i_efe = 0;
1438 iinfo->i_use = 0;
1439 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1440 if (ret)
1441 goto out;
1442 memcpy(iinfo->i_data,
1443 bh->b_data + sizeof(struct fileEntry),
1444 bs - sizeof(struct fileEntry));
1445 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1446 iinfo->i_efe = 0;
1447 iinfo->i_use = 1;
1448 iinfo->i_lenAlloc = le32_to_cpu(
1449 ((struct unallocSpaceEntry *)bh->b_data)->
1450 lengthAllocDescs);
1451 ret = udf_alloc_i_data(inode, bs -
1452 sizeof(struct unallocSpaceEntry));
1453 if (ret)
1454 goto out;
1455 memcpy(iinfo->i_data,
1456 bh->b_data + sizeof(struct unallocSpaceEntry),
1457 bs - sizeof(struct unallocSpaceEntry));
1458 return 0;
1459 }
1460
1461 ret = -EIO;
1462 read_lock(&sbi->s_cred_lock);
1463 uid = le32_to_cpu(fe->uid);
1464 if (uid == UDF_INVALID_ID ||
1465 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1466 inode->i_uid = sbi->s_uid;
1467 else
1468 i_uid_write(inode, uid);
1469
1470 gid = le32_to_cpu(fe->gid);
1471 if (gid == UDF_INVALID_ID ||
1472 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1473 inode->i_gid = sbi->s_gid;
1474 else
1475 i_gid_write(inode, gid);
1476
1477 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1478 sbi->s_fmode != UDF_INVALID_MODE)
1479 inode->i_mode = sbi->s_fmode;
1480 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1481 sbi->s_dmode != UDF_INVALID_MODE)
1482 inode->i_mode = sbi->s_dmode;
1483 else
1484 inode->i_mode = udf_convert_permissions(fe);
1485 inode->i_mode &= ~sbi->s_umask;
1486 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1487
1488 read_unlock(&sbi->s_cred_lock);
1489
1490 link_count = le16_to_cpu(fe->fileLinkCount);
1491 if (!link_count) {
1492 if (!hidden_inode) {
1493 ret = -ESTALE;
1494 goto out;
1495 }
1496 link_count = 1;
1497 }
1498 set_nlink(inode, link_count);
1499
1500 inode->i_size = le64_to_cpu(fe->informationLength);
1501 iinfo->i_lenExtents = inode->i_size;
1502
1503 if (iinfo->i_efe == 0) {
1504 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1505 (inode->i_sb->s_blocksize_bits - 9);
1506
1507 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1508 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1509 udf_disk_stamp_to_time(&ctime, fe->attrTime);
1510 inode_set_ctime_to_ts(inode, ctime);
1511
1512 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1513 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1514 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1515 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1516 iinfo->i_streamdir = 0;
1517 iinfo->i_lenStreams = 0;
1518 } else {
1519 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1520 (inode->i_sb->s_blocksize_bits - 9);
1521
1522 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1523 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1524 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1525 udf_disk_stamp_to_time(&ctime, efe->attrTime);
1526 inode_set_ctime_to_ts(inode, ctime);
1527
1528 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1529 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1530 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1531 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1532
1533 /* Named streams */
1534 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1535 iinfo->i_locStreamdir =
1536 lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1537 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1538 if (iinfo->i_lenStreams >= inode->i_size)
1539 iinfo->i_lenStreams -= inode->i_size;
1540 else
1541 iinfo->i_lenStreams = 0;
1542 }
1543 inode->i_generation = iinfo->i_unique;
1544
1545 /*
1546 * Sanity check length of allocation descriptors and extended attrs to
1547 * avoid integer overflows
1548 */
1549 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1550 goto out;
1551 /* Now do exact checks */
1552 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1553 goto out;
1554 /* Sanity checks for files in ICB so that we don't get confused later */
1555 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1556 /*
1557 * For file in ICB data is stored in allocation descriptor
1558 * so sizes should match
1559 */
1560 if (iinfo->i_lenAlloc != inode->i_size)
1561 goto out;
1562 /* File in ICB has to fit in there... */
1563 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1564 goto out;
1565 }
1566
1567 switch (fe->icbTag.fileType) {
1568 case ICBTAG_FILE_TYPE_DIRECTORY:
1569 inode->i_op = &udf_dir_inode_operations;
1570 inode->i_fop = &udf_dir_operations;
1571 inode->i_mode |= S_IFDIR;
1572 inc_nlink(inode);
1573 break;
1574 case ICBTAG_FILE_TYPE_REALTIME:
1575 case ICBTAG_FILE_TYPE_REGULAR:
1576 case ICBTAG_FILE_TYPE_UNDEF:
1577 case ICBTAG_FILE_TYPE_VAT20:
1578 inode->i_data.a_ops = &udf_aops;
1579 inode->i_op = &udf_file_inode_operations;
1580 inode->i_fop = &udf_file_operations;
1581 inode->i_mode |= S_IFREG;
1582 break;
1583 case ICBTAG_FILE_TYPE_BLOCK:
1584 inode->i_mode |= S_IFBLK;
1585 break;
1586 case ICBTAG_FILE_TYPE_CHAR:
1587 inode->i_mode |= S_IFCHR;
1588 break;
1589 case ICBTAG_FILE_TYPE_FIFO:
1590 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1591 break;
1592 case ICBTAG_FILE_TYPE_SOCKET:
1593 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1594 break;
1595 case ICBTAG_FILE_TYPE_SYMLINK:
1596 inode->i_data.a_ops = &udf_symlink_aops;
1597 inode->i_op = &udf_symlink_inode_operations;
1598 inode_nohighmem(inode);
1599 inode->i_mode = S_IFLNK | 0777;
1600 break;
1601 case ICBTAG_FILE_TYPE_MAIN:
1602 udf_debug("METADATA FILE-----\n");
1603 break;
1604 case ICBTAG_FILE_TYPE_MIRROR:
1605 udf_debug("METADATA MIRROR FILE-----\n");
1606 break;
1607 case ICBTAG_FILE_TYPE_BITMAP:
1608 udf_debug("METADATA BITMAP FILE-----\n");
1609 break;
1610 default:
1611 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1612 inode->i_ino, fe->icbTag.fileType);
1613 goto out;
1614 }
1615 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1616 struct deviceSpec *dsea =
1617 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1618 if (dsea) {
1619 init_special_inode(inode, inode->i_mode,
1620 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1621 le32_to_cpu(dsea->minorDeviceIdent)));
1622 /* Developer ID ??? */
1623 } else
1624 goto out;
1625 }
1626 ret = 0;
1627 out:
1628 brelse(bh);
1629 return ret;
1630 }
1631
udf_alloc_i_data(struct inode * inode,size_t size)1632 static int udf_alloc_i_data(struct inode *inode, size_t size)
1633 {
1634 struct udf_inode_info *iinfo = UDF_I(inode);
1635 iinfo->i_data = kmalloc(size, GFP_KERNEL);
1636 if (!iinfo->i_data)
1637 return -ENOMEM;
1638 return 0;
1639 }
1640
udf_convert_permissions(struct fileEntry * fe)1641 static umode_t udf_convert_permissions(struct fileEntry *fe)
1642 {
1643 umode_t mode;
1644 uint32_t permissions;
1645 uint32_t flags;
1646
1647 permissions = le32_to_cpu(fe->permissions);
1648 flags = le16_to_cpu(fe->icbTag.flags);
1649
1650 mode = ((permissions) & 0007) |
1651 ((permissions >> 2) & 0070) |
1652 ((permissions >> 4) & 0700) |
1653 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1654 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1655 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1656
1657 return mode;
1658 }
1659
udf_update_extra_perms(struct inode * inode,umode_t mode)1660 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1661 {
1662 struct udf_inode_info *iinfo = UDF_I(inode);
1663
1664 /*
1665 * UDF 2.01 sec. 3.3.3.3 Note 2:
1666 * In Unix, delete permission tracks write
1667 */
1668 iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1669 if (mode & 0200)
1670 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1671 if (mode & 0020)
1672 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1673 if (mode & 0002)
1674 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1675 }
1676
udf_write_inode(struct inode * inode,struct writeback_control * wbc)1677 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1678 {
1679 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1680 }
1681
udf_sync_inode(struct inode * inode)1682 static int udf_sync_inode(struct inode *inode)
1683 {
1684 return udf_update_inode(inode, 1);
1685 }
1686
udf_adjust_time(struct udf_inode_info * iinfo,struct timespec64 time)1687 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1688 {
1689 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1690 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1691 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1692 iinfo->i_crtime = time;
1693 }
1694
udf_update_inode(struct inode * inode,int do_sync)1695 static int udf_update_inode(struct inode *inode, int do_sync)
1696 {
1697 struct buffer_head *bh = NULL;
1698 struct fileEntry *fe;
1699 struct extendedFileEntry *efe;
1700 uint64_t lb_recorded;
1701 uint32_t udfperms;
1702 uint16_t icbflags;
1703 uint16_t crclen;
1704 int err = 0;
1705 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1706 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1707 struct udf_inode_info *iinfo = UDF_I(inode);
1708
1709 bh = sb_getblk(inode->i_sb,
1710 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1711 if (!bh) {
1712 udf_debug("getblk failure\n");
1713 return -EIO;
1714 }
1715
1716 lock_buffer(bh);
1717 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1718 fe = (struct fileEntry *)bh->b_data;
1719 efe = (struct extendedFileEntry *)bh->b_data;
1720
1721 if (iinfo->i_use) {
1722 struct unallocSpaceEntry *use =
1723 (struct unallocSpaceEntry *)bh->b_data;
1724
1725 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1726 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1727 iinfo->i_data, inode->i_sb->s_blocksize -
1728 sizeof(struct unallocSpaceEntry));
1729 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1730 crclen = sizeof(struct unallocSpaceEntry);
1731
1732 goto finish;
1733 }
1734
1735 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1736 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1737 else
1738 fe->uid = cpu_to_le32(i_uid_read(inode));
1739
1740 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1741 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1742 else
1743 fe->gid = cpu_to_le32(i_gid_read(inode));
1744
1745 udfperms = ((inode->i_mode & 0007)) |
1746 ((inode->i_mode & 0070) << 2) |
1747 ((inode->i_mode & 0700) << 4);
1748
1749 udfperms |= iinfo->i_extraPerms;
1750 fe->permissions = cpu_to_le32(udfperms);
1751
1752 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1753 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1754 else {
1755 if (iinfo->i_hidden)
1756 fe->fileLinkCount = cpu_to_le16(0);
1757 else
1758 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1759 }
1760
1761 fe->informationLength = cpu_to_le64(inode->i_size);
1762
1763 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1764 struct regid *eid;
1765 struct deviceSpec *dsea =
1766 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1767 if (!dsea) {
1768 dsea = (struct deviceSpec *)
1769 udf_add_extendedattr(inode,
1770 sizeof(struct deviceSpec) +
1771 sizeof(struct regid), 12, 0x3);
1772 dsea->attrType = cpu_to_le32(12);
1773 dsea->attrSubtype = 1;
1774 dsea->attrLength = cpu_to_le32(
1775 sizeof(struct deviceSpec) +
1776 sizeof(struct regid));
1777 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1778 }
1779 eid = (struct regid *)dsea->impUse;
1780 memset(eid, 0, sizeof(*eid));
1781 strcpy(eid->ident, UDF_ID_DEVELOPER);
1782 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1783 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1784 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1785 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1786 }
1787
1788 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1789 lb_recorded = 0; /* No extents => no blocks! */
1790 else
1791 lb_recorded =
1792 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1793 (blocksize_bits - 9);
1794
1795 if (iinfo->i_efe == 0) {
1796 memcpy(bh->b_data + sizeof(struct fileEntry),
1797 iinfo->i_data,
1798 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1799 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1800
1801 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1802 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1803 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1804 memset(&(fe->impIdent), 0, sizeof(struct regid));
1805 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1806 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1807 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1808 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1809 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1810 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1811 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1812 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1813 crclen = sizeof(struct fileEntry);
1814 } else {
1815 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1816 iinfo->i_data,
1817 inode->i_sb->s_blocksize -
1818 sizeof(struct extendedFileEntry));
1819 efe->objectSize =
1820 cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1821 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1822
1823 if (iinfo->i_streamdir) {
1824 struct long_ad *icb_lad = &efe->streamDirectoryICB;
1825
1826 icb_lad->extLocation =
1827 cpu_to_lelb(iinfo->i_locStreamdir);
1828 icb_lad->extLength =
1829 cpu_to_le32(inode->i_sb->s_blocksize);
1830 }
1831
1832 udf_adjust_time(iinfo, inode->i_atime);
1833 udf_adjust_time(iinfo, inode->i_mtime);
1834 udf_adjust_time(iinfo, inode_get_ctime(inode));
1835
1836 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1837 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
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
__udf_iget(struct super_block * sb,struct kernel_lb_addr * ino,bool hidden_inode)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
udf_setup_indirect_aext(struct inode * inode,udf_pblk_t block,struct extent_position * epos)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 */
__udf_add_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t elen,int inc)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 */
udf_add_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t elen,int inc)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
udf_write_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t elen,int inc)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
udf_next_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t * elen,int inc)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
udf_current_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t * elen,int inc)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
udf_insert_aext(struct inode * inode,struct extent_position epos,struct kernel_lb_addr neloc,uint32_t nelen)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
udf_delete_aext(struct inode * inode,struct extent_position epos)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
inode_bmap(struct inode * inode,sector_t block,struct extent_position * pos,struct kernel_lb_addr * eloc,uint32_t * elen,sector_t * offset)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
