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