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