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 filemap_invalidate_lock(inode->i_mapping);
1256 iinfo = UDF_I(inode);
1257 if (newsize > inode->i_size) {
1258 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1259 if (bsize >=
1260 (udf_file_entry_alloc_offset(inode) + newsize)) {
1261 down_write(&iinfo->i_data_sem);
1262 iinfo->i_lenAlloc = newsize;
1263 up_write(&iinfo->i_data_sem);
1264 goto set_size;
1265 }
1266 err = udf_expand_file_adinicb(inode);
1267 if (err)
1268 goto out_unlock;
1269 }
1270 err = udf_extend_file(inode, newsize);
1271 if (err)
1272 goto out_unlock;
1273 set_size:
1274 truncate_setsize(inode, newsize);
1275 } else {
1276 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1277 down_write(&iinfo->i_data_sem);
1278 udf_clear_extent_cache(inode);
1279 memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1280 0x00, bsize - newsize -
1281 udf_file_entry_alloc_offset(inode));
1282 iinfo->i_lenAlloc = newsize;
1283 truncate_setsize(inode, newsize);
1284 up_write(&iinfo->i_data_sem);
1285 goto update_time;
1286 }
1287 err = block_truncate_page(inode->i_mapping, newsize,
1288 udf_get_block);
1289 if (err)
1290 goto out_unlock;
1291 truncate_setsize(inode, newsize);
1292 down_write(&iinfo->i_data_sem);
1293 udf_clear_extent_cache(inode);
1294 err = udf_truncate_extents(inode);
1295 up_write(&iinfo->i_data_sem);
1296 if (err)
1297 goto out_unlock;
1298 }
1299 update_time:
1300 inode->i_mtime = inode_set_ctime_current(inode);
1301 if (IS_SYNC(inode))
1302 udf_sync_inode(inode);
1303 else
1304 mark_inode_dirty(inode);
1305 out_unlock:
1306 filemap_invalidate_unlock(inode->i_mapping);
1307 return err;
1308 }
1309
1310 /*
1311 * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1312 * arbitrary - just that we hopefully don't limit any real use of rewritten
1313 * inode on write-once media but avoid looping for too long on corrupted media.
1314 */
1315 #define UDF_MAX_ICB_NESTING 1024
1316
udf_read_inode(struct inode * inode,bool hidden_inode)1317 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1318 {
1319 struct buffer_head *bh = NULL;
1320 struct fileEntry *fe;
1321 struct extendedFileEntry *efe;
1322 uint16_t ident;
1323 struct udf_inode_info *iinfo = UDF_I(inode);
1324 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1325 struct kernel_lb_addr *iloc = &iinfo->i_location;
1326 unsigned int link_count;
1327 unsigned int indirections = 0;
1328 int bs = inode->i_sb->s_blocksize;
1329 int ret = -EIO;
1330 uint32_t uid, gid;
1331 struct timespec64 ctime;
1332
1333 reread:
1334 if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1335 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1336 iloc->partitionReferenceNum, sbi->s_partitions);
1337 return -EIO;
1338 }
1339
1340 if (iloc->logicalBlockNum >=
1341 sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1342 udf_debug("block=%u, partition=%u out of range\n",
1343 iloc->logicalBlockNum, iloc->partitionReferenceNum);
1344 return -EIO;
1345 }
1346
1347 /*
1348 * Set defaults, but the inode is still incomplete!
1349 * Note: get_new_inode() sets the following on a new inode:
1350 * i_sb = sb
1351 * i_no = ino
1352 * i_flags = sb->s_flags
1353 * i_state = 0
1354 * clean_inode(): zero fills and sets
1355 * i_count = 1
1356 * i_nlink = 1
1357 * i_op = NULL;
1358 */
1359 bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1360 if (!bh) {
1361 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1362 return -EIO;
1363 }
1364
1365 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1366 ident != TAG_IDENT_USE) {
1367 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1368 inode->i_ino, ident);
1369 goto out;
1370 }
1371
1372 fe = (struct fileEntry *)bh->b_data;
1373 efe = (struct extendedFileEntry *)bh->b_data;
1374
1375 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1376 struct buffer_head *ibh;
1377
1378 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1379 if (ident == TAG_IDENT_IE && ibh) {
1380 struct kernel_lb_addr loc;
1381 struct indirectEntry *ie;
1382
1383 ie = (struct indirectEntry *)ibh->b_data;
1384 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1385
1386 if (ie->indirectICB.extLength) {
1387 brelse(ibh);
1388 memcpy(&iinfo->i_location, &loc,
1389 sizeof(struct kernel_lb_addr));
1390 if (++indirections > UDF_MAX_ICB_NESTING) {
1391 udf_err(inode->i_sb,
1392 "too many ICBs in ICB hierarchy"
1393 " (max %d supported)\n",
1394 UDF_MAX_ICB_NESTING);
1395 goto out;
1396 }
1397 brelse(bh);
1398 goto reread;
1399 }
1400 }
1401 brelse(ibh);
1402 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1403 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1404 le16_to_cpu(fe->icbTag.strategyType));
1405 goto out;
1406 }
1407 if (fe->icbTag.strategyType == cpu_to_le16(4))
1408 iinfo->i_strat4096 = 0;
1409 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1410 iinfo->i_strat4096 = 1;
1411
1412 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1413 ICBTAG_FLAG_AD_MASK;
1414 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1415 iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1416 iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1417 ret = -EIO;
1418 goto out;
1419 }
1420 iinfo->i_hidden = hidden_inode;
1421 iinfo->i_unique = 0;
1422 iinfo->i_lenEAttr = 0;
1423 iinfo->i_lenExtents = 0;
1424 iinfo->i_lenAlloc = 0;
1425 iinfo->i_next_alloc_block = 0;
1426 iinfo->i_next_alloc_goal = 0;
1427 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1428 iinfo->i_efe = 1;
1429 iinfo->i_use = 0;
1430 ret = udf_alloc_i_data(inode, bs -
1431 sizeof(struct extendedFileEntry));
1432 if (ret)
1433 goto out;
1434 memcpy(iinfo->i_data,
1435 bh->b_data + sizeof(struct extendedFileEntry),
1436 bs - sizeof(struct extendedFileEntry));
1437 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1438 iinfo->i_efe = 0;
1439 iinfo->i_use = 0;
1440 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1441 if (ret)
1442 goto out;
1443 memcpy(iinfo->i_data,
1444 bh->b_data + sizeof(struct fileEntry),
1445 bs - sizeof(struct fileEntry));
1446 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1447 iinfo->i_efe = 0;
1448 iinfo->i_use = 1;
1449 iinfo->i_lenAlloc = le32_to_cpu(
1450 ((struct unallocSpaceEntry *)bh->b_data)->
1451 lengthAllocDescs);
1452 ret = udf_alloc_i_data(inode, bs -
1453 sizeof(struct unallocSpaceEntry));
1454 if (ret)
1455 goto out;
1456 memcpy(iinfo->i_data,
1457 bh->b_data + sizeof(struct unallocSpaceEntry),
1458 bs - sizeof(struct unallocSpaceEntry));
1459 return 0;
1460 }
1461
1462 ret = -EIO;
1463 read_lock(&sbi->s_cred_lock);
1464 uid = le32_to_cpu(fe->uid);
1465 if (uid == UDF_INVALID_ID ||
1466 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1467 inode->i_uid = sbi->s_uid;
1468 else
1469 i_uid_write(inode, uid);
1470
1471 gid = le32_to_cpu(fe->gid);
1472 if (gid == UDF_INVALID_ID ||
1473 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1474 inode->i_gid = sbi->s_gid;
1475 else
1476 i_gid_write(inode, gid);
1477
1478 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1479 sbi->s_fmode != UDF_INVALID_MODE)
1480 inode->i_mode = sbi->s_fmode;
1481 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1482 sbi->s_dmode != UDF_INVALID_MODE)
1483 inode->i_mode = sbi->s_dmode;
1484 else
1485 inode->i_mode = udf_convert_permissions(fe);
1486 inode->i_mode &= ~sbi->s_umask;
1487 iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1488
1489 read_unlock(&sbi->s_cred_lock);
1490
1491 link_count = le16_to_cpu(fe->fileLinkCount);
1492 if (!link_count) {
1493 if (!hidden_inode) {
1494 ret = -ESTALE;
1495 goto out;
1496 }
1497 link_count = 1;
1498 }
1499 set_nlink(inode, link_count);
1500
1501 inode->i_size = le64_to_cpu(fe->informationLength);
1502 iinfo->i_lenExtents = inode->i_size;
1503
1504 if (iinfo->i_efe == 0) {
1505 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1506 (inode->i_sb->s_blocksize_bits - 9);
1507
1508 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1509 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1510 udf_disk_stamp_to_time(&ctime, fe->attrTime);
1511 inode_set_ctime_to_ts(inode, ctime);
1512
1513 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1514 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1515 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1516 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1517 iinfo->i_streamdir = 0;
1518 iinfo->i_lenStreams = 0;
1519 } else {
1520 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1521 (inode->i_sb->s_blocksize_bits - 9);
1522
1523 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1524 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1525 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1526 udf_disk_stamp_to_time(&ctime, efe->attrTime);
1527 inode_set_ctime_to_ts(inode, ctime);
1528
1529 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1530 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1531 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1532 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1533
1534 /* Named streams */
1535 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1536 iinfo->i_locStreamdir =
1537 lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1538 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1539 if (iinfo->i_lenStreams >= inode->i_size)
1540 iinfo->i_lenStreams -= inode->i_size;
1541 else
1542 iinfo->i_lenStreams = 0;
1543 }
1544 inode->i_generation = iinfo->i_unique;
1545
1546 /*
1547 * Sanity check length of allocation descriptors and extended attrs to
1548 * avoid integer overflows
1549 */
1550 if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1551 goto out;
1552 /* Now do exact checks */
1553 if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1554 goto out;
1555 /* Sanity checks for files in ICB so that we don't get confused later */
1556 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1557 /*
1558 * For file in ICB data is stored in allocation descriptor
1559 * so sizes should match
1560 */
1561 if (iinfo->i_lenAlloc != inode->i_size)
1562 goto out;
1563 /* File in ICB has to fit in there... */
1564 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1565 goto out;
1566 }
1567
1568 switch (fe->icbTag.fileType) {
1569 case ICBTAG_FILE_TYPE_DIRECTORY:
1570 inode->i_op = &udf_dir_inode_operations;
1571 inode->i_fop = &udf_dir_operations;
1572 inode->i_mode |= S_IFDIR;
1573 inc_nlink(inode);
1574 break;
1575 case ICBTAG_FILE_TYPE_REALTIME:
1576 case ICBTAG_FILE_TYPE_REGULAR:
1577 case ICBTAG_FILE_TYPE_UNDEF:
1578 case ICBTAG_FILE_TYPE_VAT20:
1579 inode->i_data.a_ops = &udf_aops;
1580 inode->i_op = &udf_file_inode_operations;
1581 inode->i_fop = &udf_file_operations;
1582 inode->i_mode |= S_IFREG;
1583 break;
1584 case ICBTAG_FILE_TYPE_BLOCK:
1585 inode->i_mode |= S_IFBLK;
1586 break;
1587 case ICBTAG_FILE_TYPE_CHAR:
1588 inode->i_mode |= S_IFCHR;
1589 break;
1590 case ICBTAG_FILE_TYPE_FIFO:
1591 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1592 break;
1593 case ICBTAG_FILE_TYPE_SOCKET:
1594 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1595 break;
1596 case ICBTAG_FILE_TYPE_SYMLINK:
1597 inode->i_data.a_ops = &udf_symlink_aops;
1598 inode->i_op = &udf_symlink_inode_operations;
1599 inode_nohighmem(inode);
1600 inode->i_mode = S_IFLNK | 0777;
1601 break;
1602 case ICBTAG_FILE_TYPE_MAIN:
1603 udf_debug("METADATA FILE-----\n");
1604 break;
1605 case ICBTAG_FILE_TYPE_MIRROR:
1606 udf_debug("METADATA MIRROR FILE-----\n");
1607 break;
1608 case ICBTAG_FILE_TYPE_BITMAP:
1609 udf_debug("METADATA BITMAP FILE-----\n");
1610 break;
1611 default:
1612 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1613 inode->i_ino, fe->icbTag.fileType);
1614 goto out;
1615 }
1616 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1617 struct deviceSpec *dsea =
1618 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1619 if (dsea) {
1620 init_special_inode(inode, inode->i_mode,
1621 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1622 le32_to_cpu(dsea->minorDeviceIdent)));
1623 /* Developer ID ??? */
1624 } else
1625 goto out;
1626 }
1627 ret = 0;
1628 out:
1629 brelse(bh);
1630 return ret;
1631 }
1632
udf_alloc_i_data(struct inode * inode,size_t size)1633 static int udf_alloc_i_data(struct inode *inode, size_t size)
1634 {
1635 struct udf_inode_info *iinfo = UDF_I(inode);
1636 iinfo->i_data = kmalloc(size, GFP_KERNEL);
1637 if (!iinfo->i_data)
1638 return -ENOMEM;
1639 return 0;
1640 }
1641
udf_convert_permissions(struct fileEntry * fe)1642 static umode_t udf_convert_permissions(struct fileEntry *fe)
1643 {
1644 umode_t mode;
1645 uint32_t permissions;
1646 uint32_t flags;
1647
1648 permissions = le32_to_cpu(fe->permissions);
1649 flags = le16_to_cpu(fe->icbTag.flags);
1650
1651 mode = ((permissions) & 0007) |
1652 ((permissions >> 2) & 0070) |
1653 ((permissions >> 4) & 0700) |
1654 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1655 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1656 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1657
1658 return mode;
1659 }
1660
udf_update_extra_perms(struct inode * inode,umode_t mode)1661 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1662 {
1663 struct udf_inode_info *iinfo = UDF_I(inode);
1664
1665 /*
1666 * UDF 2.01 sec. 3.3.3.3 Note 2:
1667 * In Unix, delete permission tracks write
1668 */
1669 iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1670 if (mode & 0200)
1671 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1672 if (mode & 0020)
1673 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1674 if (mode & 0002)
1675 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1676 }
1677
udf_write_inode(struct inode * inode,struct writeback_control * wbc)1678 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1679 {
1680 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1681 }
1682
udf_sync_inode(struct inode * inode)1683 static int udf_sync_inode(struct inode *inode)
1684 {
1685 return udf_update_inode(inode, 1);
1686 }
1687
udf_adjust_time(struct udf_inode_info * iinfo,struct timespec64 time)1688 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1689 {
1690 if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1691 (iinfo->i_crtime.tv_sec == time.tv_sec &&
1692 iinfo->i_crtime.tv_nsec > time.tv_nsec))
1693 iinfo->i_crtime = time;
1694 }
1695
udf_update_inode(struct inode * inode,int do_sync)1696 static int udf_update_inode(struct inode *inode, int do_sync)
1697 {
1698 struct buffer_head *bh = NULL;
1699 struct fileEntry *fe;
1700 struct extendedFileEntry *efe;
1701 uint64_t lb_recorded;
1702 uint32_t udfperms;
1703 uint16_t icbflags;
1704 uint16_t crclen;
1705 int err = 0;
1706 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1707 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1708 struct udf_inode_info *iinfo = UDF_I(inode);
1709
1710 bh = sb_getblk(inode->i_sb,
1711 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1712 if (!bh) {
1713 udf_debug("getblk failure\n");
1714 return -EIO;
1715 }
1716
1717 lock_buffer(bh);
1718 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1719 fe = (struct fileEntry *)bh->b_data;
1720 efe = (struct extendedFileEntry *)bh->b_data;
1721
1722 if (iinfo->i_use) {
1723 struct unallocSpaceEntry *use =
1724 (struct unallocSpaceEntry *)bh->b_data;
1725
1726 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1727 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1728 iinfo->i_data, inode->i_sb->s_blocksize -
1729 sizeof(struct unallocSpaceEntry));
1730 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1731 crclen = sizeof(struct unallocSpaceEntry);
1732
1733 goto finish;
1734 }
1735
1736 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1737 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1738 else
1739 fe->uid = cpu_to_le32(i_uid_read(inode));
1740
1741 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1742 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1743 else
1744 fe->gid = cpu_to_le32(i_gid_read(inode));
1745
1746 udfperms = ((inode->i_mode & 0007)) |
1747 ((inode->i_mode & 0070) << 2) |
1748 ((inode->i_mode & 0700) << 4);
1749
1750 udfperms |= iinfo->i_extraPerms;
1751 fe->permissions = cpu_to_le32(udfperms);
1752
1753 if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1754 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1755 else {
1756 if (iinfo->i_hidden)
1757 fe->fileLinkCount = cpu_to_le16(0);
1758 else
1759 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1760 }
1761
1762 fe->informationLength = cpu_to_le64(inode->i_size);
1763
1764 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1765 struct regid *eid;
1766 struct deviceSpec *dsea =
1767 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1768 if (!dsea) {
1769 dsea = (struct deviceSpec *)
1770 udf_add_extendedattr(inode,
1771 sizeof(struct deviceSpec) +
1772 sizeof(struct regid), 12, 0x3);
1773 dsea->attrType = cpu_to_le32(12);
1774 dsea->attrSubtype = 1;
1775 dsea->attrLength = cpu_to_le32(
1776 sizeof(struct deviceSpec) +
1777 sizeof(struct regid));
1778 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1779 }
1780 eid = (struct regid *)dsea->impUse;
1781 memset(eid, 0, sizeof(*eid));
1782 strcpy(eid->ident, UDF_ID_DEVELOPER);
1783 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1784 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1785 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1786 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1787 }
1788
1789 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1790 lb_recorded = 0; /* No extents => no blocks! */
1791 else
1792 lb_recorded =
1793 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1794 (blocksize_bits - 9);
1795
1796 if (iinfo->i_efe == 0) {
1797 memcpy(bh->b_data + sizeof(struct fileEntry),
1798 iinfo->i_data,
1799 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1800 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1801
1802 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1803 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1804 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1805 memset(&(fe->impIdent), 0, sizeof(struct regid));
1806 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1807 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1808 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1809 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1810 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1811 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1812 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1813 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1814 crclen = sizeof(struct fileEntry);
1815 } else {
1816 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1817 iinfo->i_data,
1818 inode->i_sb->s_blocksize -
1819 sizeof(struct extendedFileEntry));
1820 efe->objectSize =
1821 cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1822 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1823
1824 if (iinfo->i_streamdir) {
1825 struct long_ad *icb_lad = &efe->streamDirectoryICB;
1826
1827 icb_lad->extLocation =
1828 cpu_to_lelb(iinfo->i_locStreamdir);
1829 icb_lad->extLength =
1830 cpu_to_le32(inode->i_sb->s_blocksize);
1831 }
1832
1833 udf_adjust_time(iinfo, inode->i_atime);
1834 udf_adjust_time(iinfo, inode->i_mtime);
1835 udf_adjust_time(iinfo, inode_get_ctime(inode));
1836
1837 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1838 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1839 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1840 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1841
1842 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1843 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1844 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1845 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1846 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1847 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1848 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1849 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1850 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1851 crclen = sizeof(struct extendedFileEntry);
1852 }
1853
1854 finish:
1855 if (iinfo->i_strat4096) {
1856 fe->icbTag.strategyType = cpu_to_le16(4096);
1857 fe->icbTag.strategyParameter = cpu_to_le16(1);
1858 fe->icbTag.numEntries = cpu_to_le16(2);
1859 } else {
1860 fe->icbTag.strategyType = cpu_to_le16(4);
1861 fe->icbTag.numEntries = cpu_to_le16(1);
1862 }
1863
1864 if (iinfo->i_use)
1865 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1866 else if (S_ISDIR(inode->i_mode))
1867 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1868 else if (S_ISREG(inode->i_mode))
1869 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1870 else if (S_ISLNK(inode->i_mode))
1871 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1872 else if (S_ISBLK(inode->i_mode))
1873 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1874 else if (S_ISCHR(inode->i_mode))
1875 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1876 else if (S_ISFIFO(inode->i_mode))
1877 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1878 else if (S_ISSOCK(inode->i_mode))
1879 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1880
1881 icbflags = iinfo->i_alloc_type |
1882 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1883 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1884 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1885 (le16_to_cpu(fe->icbTag.flags) &
1886 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1887 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1888
1889 fe->icbTag.flags = cpu_to_le16(icbflags);
1890 if (sbi->s_udfrev >= 0x0200)
1891 fe->descTag.descVersion = cpu_to_le16(3);
1892 else
1893 fe->descTag.descVersion = cpu_to_le16(2);
1894 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1895 fe->descTag.tagLocation = cpu_to_le32(
1896 iinfo->i_location.logicalBlockNum);
1897 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1898 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1899 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1900 crclen));
1901 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1902
1903 set_buffer_uptodate(bh);
1904 unlock_buffer(bh);
1905
1906 /* write the data blocks */
1907 mark_buffer_dirty(bh);
1908 if (do_sync) {
1909 sync_dirty_buffer(bh);
1910 if (buffer_write_io_error(bh)) {
1911 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1912 inode->i_ino);
1913 err = -EIO;
1914 }
1915 }
1916 brelse(bh);
1917
1918 return err;
1919 }
1920
__udf_iget(struct super_block * sb,struct kernel_lb_addr * ino,bool hidden_inode)1921 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1922 bool hidden_inode)
1923 {
1924 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1925 struct inode *inode = iget_locked(sb, block);
1926 int err;
1927
1928 if (!inode)
1929 return ERR_PTR(-ENOMEM);
1930
1931 if (!(inode->i_state & I_NEW)) {
1932 if (UDF_I(inode)->i_hidden != hidden_inode) {
1933 iput(inode);
1934 return ERR_PTR(-EFSCORRUPTED);
1935 }
1936 return inode;
1937 }
1938
1939 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1940 err = udf_read_inode(inode, hidden_inode);
1941 if (err < 0) {
1942 iget_failed(inode);
1943 return ERR_PTR(err);
1944 }
1945 unlock_new_inode(inode);
1946
1947 return inode;
1948 }
1949
udf_setup_indirect_aext(struct inode * inode,udf_pblk_t block,struct extent_position * epos)1950 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1951 struct extent_position *epos)
1952 {
1953 struct super_block *sb = inode->i_sb;
1954 struct buffer_head *bh;
1955 struct allocExtDesc *aed;
1956 struct extent_position nepos;
1957 struct kernel_lb_addr neloc;
1958 int ver, adsize;
1959
1960 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1961 adsize = sizeof(struct short_ad);
1962 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1963 adsize = sizeof(struct long_ad);
1964 else
1965 return -EIO;
1966
1967 neloc.logicalBlockNum = block;
1968 neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1969
1970 bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1971 if (!bh)
1972 return -EIO;
1973 lock_buffer(bh);
1974 memset(bh->b_data, 0x00, sb->s_blocksize);
1975 set_buffer_uptodate(bh);
1976 unlock_buffer(bh);
1977 mark_buffer_dirty_inode(bh, inode);
1978
1979 aed = (struct allocExtDesc *)(bh->b_data);
1980 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1981 aed->previousAllocExtLocation =
1982 cpu_to_le32(epos->block.logicalBlockNum);
1983 }
1984 aed->lengthAllocDescs = cpu_to_le32(0);
1985 if (UDF_SB(sb)->s_udfrev >= 0x0200)
1986 ver = 3;
1987 else
1988 ver = 2;
1989 udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1990 sizeof(struct tag));
1991
1992 nepos.block = neloc;
1993 nepos.offset = sizeof(struct allocExtDesc);
1994 nepos.bh = bh;
1995
1996 /*
1997 * Do we have to copy current last extent to make space for indirect
1998 * one?
1999 */
2000 if (epos->offset + adsize > sb->s_blocksize) {
2001 struct kernel_lb_addr cp_loc;
2002 uint32_t cp_len;
2003 int cp_type;
2004
2005 epos->offset -= adsize;
2006 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2007 cp_len |= ((uint32_t)cp_type) << 30;
2008
2009 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2010 udf_write_aext(inode, epos, &nepos.block,
2011 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2012 } else {
2013 __udf_add_aext(inode, epos, &nepos.block,
2014 sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2015 }
2016
2017 brelse(epos->bh);
2018 *epos = nepos;
2019
2020 return 0;
2021 }
2022
2023 /*
2024 * Append extent at the given position - should be the first free one in inode
2025 * / indirect extent. This function assumes there is enough space in the inode
2026 * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2027 */
__udf_add_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t elen,int inc)2028 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2029 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2030 {
2031 struct udf_inode_info *iinfo = UDF_I(inode);
2032 struct allocExtDesc *aed;
2033 int adsize;
2034
2035 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2036 adsize = sizeof(struct short_ad);
2037 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2038 adsize = sizeof(struct long_ad);
2039 else
2040 return -EIO;
2041
2042 if (!epos->bh) {
2043 WARN_ON(iinfo->i_lenAlloc !=
2044 epos->offset - udf_file_entry_alloc_offset(inode));
2045 } else {
2046 aed = (struct allocExtDesc *)epos->bh->b_data;
2047 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2048 epos->offset - sizeof(struct allocExtDesc));
2049 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2050 }
2051
2052 udf_write_aext(inode, epos, eloc, elen, inc);
2053
2054 if (!epos->bh) {
2055 iinfo->i_lenAlloc += adsize;
2056 mark_inode_dirty(inode);
2057 } else {
2058 aed = (struct allocExtDesc *)epos->bh->b_data;
2059 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2060 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2061 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2062 udf_update_tag(epos->bh->b_data,
2063 epos->offset + (inc ? 0 : adsize));
2064 else
2065 udf_update_tag(epos->bh->b_data,
2066 sizeof(struct allocExtDesc));
2067 mark_buffer_dirty_inode(epos->bh, inode);
2068 }
2069
2070 return 0;
2071 }
2072
2073 /*
2074 * Append extent at given position - should be the first free one in inode
2075 * / indirect extent. Takes care of allocating and linking indirect blocks.
2076 */
udf_add_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t elen,int inc)2077 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2078 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2079 {
2080 int adsize;
2081 struct super_block *sb = inode->i_sb;
2082
2083 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2084 adsize = sizeof(struct short_ad);
2085 else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2086 adsize = sizeof(struct long_ad);
2087 else
2088 return -EIO;
2089
2090 if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2091 int err;
2092 udf_pblk_t new_block;
2093
2094 new_block = udf_new_block(sb, NULL,
2095 epos->block.partitionReferenceNum,
2096 epos->block.logicalBlockNum, &err);
2097 if (!new_block)
2098 return -ENOSPC;
2099
2100 err = udf_setup_indirect_aext(inode, new_block, epos);
2101 if (err)
2102 return err;
2103 }
2104
2105 return __udf_add_aext(inode, epos, eloc, elen, inc);
2106 }
2107
udf_write_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t elen,int inc)2108 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2109 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2110 {
2111 int adsize;
2112 uint8_t *ptr;
2113 struct short_ad *sad;
2114 struct long_ad *lad;
2115 struct udf_inode_info *iinfo = UDF_I(inode);
2116
2117 if (!epos->bh)
2118 ptr = iinfo->i_data + epos->offset -
2119 udf_file_entry_alloc_offset(inode) +
2120 iinfo->i_lenEAttr;
2121 else
2122 ptr = epos->bh->b_data + epos->offset;
2123
2124 switch (iinfo->i_alloc_type) {
2125 case ICBTAG_FLAG_AD_SHORT:
2126 sad = (struct short_ad *)ptr;
2127 sad->extLength = cpu_to_le32(elen);
2128 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2129 adsize = sizeof(struct short_ad);
2130 break;
2131 case ICBTAG_FLAG_AD_LONG:
2132 lad = (struct long_ad *)ptr;
2133 lad->extLength = cpu_to_le32(elen);
2134 lad->extLocation = cpu_to_lelb(*eloc);
2135 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2136 adsize = sizeof(struct long_ad);
2137 break;
2138 default:
2139 return;
2140 }
2141
2142 if (epos->bh) {
2143 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2144 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2145 struct allocExtDesc *aed =
2146 (struct allocExtDesc *)epos->bh->b_data;
2147 udf_update_tag(epos->bh->b_data,
2148 le32_to_cpu(aed->lengthAllocDescs) +
2149 sizeof(struct allocExtDesc));
2150 }
2151 mark_buffer_dirty_inode(epos->bh, inode);
2152 } else {
2153 mark_inode_dirty(inode);
2154 }
2155
2156 if (inc)
2157 epos->offset += adsize;
2158 }
2159
2160 /*
2161 * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2162 * someone does some weird stuff.
2163 */
2164 #define UDF_MAX_INDIR_EXTS 16
2165
udf_next_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t * elen,int inc)2166 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2167 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2168 {
2169 int8_t etype;
2170 unsigned int indirections = 0;
2171
2172 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2173 (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2174 udf_pblk_t block;
2175
2176 if (++indirections > UDF_MAX_INDIR_EXTS) {
2177 udf_err(inode->i_sb,
2178 "too many indirect extents in inode %lu\n",
2179 inode->i_ino);
2180 return -1;
2181 }
2182
2183 epos->block = *eloc;
2184 epos->offset = sizeof(struct allocExtDesc);
2185 brelse(epos->bh);
2186 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2187 epos->bh = sb_bread(inode->i_sb, block);
2188 if (!epos->bh) {
2189 udf_debug("reading block %u failed!\n", block);
2190 return -1;
2191 }
2192 }
2193
2194 return etype;
2195 }
2196
udf_current_aext(struct inode * inode,struct extent_position * epos,struct kernel_lb_addr * eloc,uint32_t * elen,int inc)2197 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2198 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2199 {
2200 int alen;
2201 int8_t etype;
2202 uint8_t *ptr;
2203 struct short_ad *sad;
2204 struct long_ad *lad;
2205 struct udf_inode_info *iinfo = UDF_I(inode);
2206
2207 if (!epos->bh) {
2208 if (!epos->offset)
2209 epos->offset = udf_file_entry_alloc_offset(inode);
2210 ptr = iinfo->i_data + epos->offset -
2211 udf_file_entry_alloc_offset(inode) +
2212 iinfo->i_lenEAttr;
2213 alen = udf_file_entry_alloc_offset(inode) +
2214 iinfo->i_lenAlloc;
2215 } else {
2216 if (!epos->offset)
2217 epos->offset = sizeof(struct allocExtDesc);
2218 ptr = epos->bh->b_data + epos->offset;
2219 alen = sizeof(struct allocExtDesc) +
2220 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2221 lengthAllocDescs);
2222 }
2223
2224 switch (iinfo->i_alloc_type) {
2225 case ICBTAG_FLAG_AD_SHORT:
2226 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2227 if (!sad)
2228 return -1;
2229 etype = le32_to_cpu(sad->extLength) >> 30;
2230 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2231 eloc->partitionReferenceNum =
2232 iinfo->i_location.partitionReferenceNum;
2233 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2234 break;
2235 case ICBTAG_FLAG_AD_LONG:
2236 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2237 if (!lad)
2238 return -1;
2239 etype = le32_to_cpu(lad->extLength) >> 30;
2240 *eloc = lelb_to_cpu(lad->extLocation);
2241 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2242 break;
2243 default:
2244 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2245 return -1;
2246 }
2247
2248 return etype;
2249 }
2250
udf_insert_aext(struct inode * inode,struct extent_position epos,struct kernel_lb_addr neloc,uint32_t nelen)2251 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2252 struct kernel_lb_addr neloc, uint32_t nelen)
2253 {
2254 struct kernel_lb_addr oeloc;
2255 uint32_t oelen;
2256 int8_t etype;
2257 int err;
2258
2259 if (epos.bh)
2260 get_bh(epos.bh);
2261
2262 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2263 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2264 neloc = oeloc;
2265 nelen = (etype << 30) | oelen;
2266 }
2267 err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2268 brelse(epos.bh);
2269
2270 return err;
2271 }
2272
udf_delete_aext(struct inode * inode,struct extent_position epos)2273 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2274 {
2275 struct extent_position oepos;
2276 int adsize;
2277 int8_t etype;
2278 struct allocExtDesc *aed;
2279 struct udf_inode_info *iinfo;
2280 struct kernel_lb_addr eloc;
2281 uint32_t elen;
2282
2283 if (epos.bh) {
2284 get_bh(epos.bh);
2285 get_bh(epos.bh);
2286 }
2287
2288 iinfo = UDF_I(inode);
2289 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2290 adsize = sizeof(struct short_ad);
2291 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2292 adsize = sizeof(struct long_ad);
2293 else
2294 adsize = 0;
2295
2296 oepos = epos;
2297 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2298 return -1;
2299
2300 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2301 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2302 if (oepos.bh != epos.bh) {
2303 oepos.block = epos.block;
2304 brelse(oepos.bh);
2305 get_bh(epos.bh);
2306 oepos.bh = epos.bh;
2307 oepos.offset = epos.offset - adsize;
2308 }
2309 }
2310 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2311 elen = 0;
2312
2313 if (epos.bh != oepos.bh) {
2314 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2315 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2316 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2317 if (!oepos.bh) {
2318 iinfo->i_lenAlloc -= (adsize * 2);
2319 mark_inode_dirty(inode);
2320 } else {
2321 aed = (struct allocExtDesc *)oepos.bh->b_data;
2322 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2323 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2324 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2325 udf_update_tag(oepos.bh->b_data,
2326 oepos.offset - (2 * adsize));
2327 else
2328 udf_update_tag(oepos.bh->b_data,
2329 sizeof(struct allocExtDesc));
2330 mark_buffer_dirty_inode(oepos.bh, inode);
2331 }
2332 } else {
2333 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2334 if (!oepos.bh) {
2335 iinfo->i_lenAlloc -= adsize;
2336 mark_inode_dirty(inode);
2337 } else {
2338 aed = (struct allocExtDesc *)oepos.bh->b_data;
2339 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2340 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2341 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2342 udf_update_tag(oepos.bh->b_data,
2343 epos.offset - adsize);
2344 else
2345 udf_update_tag(oepos.bh->b_data,
2346 sizeof(struct allocExtDesc));
2347 mark_buffer_dirty_inode(oepos.bh, inode);
2348 }
2349 }
2350
2351 brelse(epos.bh);
2352 brelse(oepos.bh);
2353
2354 return (elen >> 30);
2355 }
2356
inode_bmap(struct inode * inode,sector_t block,struct extent_position * pos,struct kernel_lb_addr * eloc,uint32_t * elen,sector_t * offset)2357 int8_t inode_bmap(struct inode *inode, sector_t block,
2358 struct extent_position *pos, struct kernel_lb_addr *eloc,
2359 uint32_t *elen, sector_t *offset)
2360 {
2361 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2362 loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2363 int8_t etype;
2364 struct udf_inode_info *iinfo;
2365
2366 iinfo = UDF_I(inode);
2367 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2368 pos->offset = 0;
2369 pos->block = iinfo->i_location;
2370 pos->bh = NULL;
2371 }
2372 *elen = 0;
2373 do {
2374 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2375 if (etype == -1) {
2376 *offset = (bcount - lbcount) >> blocksize_bits;
2377 iinfo->i_lenExtents = lbcount;
2378 return -1;
2379 }
2380 lbcount += *elen;
2381 } while (lbcount <= bcount);
2382 /* update extent cache */
2383 udf_update_extent_cache(inode, lbcount - *elen, pos);
2384 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2385
2386 return etype;
2387 }
2388