?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
lockdep: Consolidate bug messages into a single print_lockdep_off() function
[linux-2.6.git] / fs / udf / inode.c
blob7a12e48ad8196d51273fcc2ca66e89d077eb66ee
1 /*
2 * inode.c
3 *
4 * PURPOSE
5 * Inode handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
16 *
17 * HISTORY
18 *
19 * 10/04/98 dgb Added rudimentary directory functions
20 * 10/07/98 Fully working udf_block_map! It works!
21 * 11/25/98 bmap altered to better support extents
22 * 12/06/98 blf partition support in udf_iget, udf_block_map
23 * and udf_read_inode
24 * 12/12/98 rewrote udf_block_map to handle next extents and descs across
25 * block boundaries (which is not actually allowed)
26 * 12/20/98 added support for strategy 4096
27 * 03/07/99 rewrote udf_block_map (again)
28 * New funcs, inode_bmap, udf_next_aext
29 * 04/19/99 Support for writing device EA's for major/minor #
30 */
31
32 #include "udfdecl.h"
33 #include <linux/mm.h>
34 #include <linux/module.h>
35 #include <linux/pagemap.h>
36 #include <linux/buffer_head.h>
37 #include <linux/writeback.h>
38 #include <linux/slab.h>
39 #include <linux/crc-itu-t.h>
40 #include <linux/mpage.h>
41
42 #include "udf_i.h"
43 #include "udf_sb.h"
44
45 MODULE_AUTHOR("Ben Fennema");
46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
47 MODULE_LICENSE("GPL");
48
49 #define EXTENT_MERGE_SIZE 5
50
51 static umode_t udf_convert_permissions(struct fileEntry *);
52 static int udf_update_inode(struct inode *, int);
53 static void udf_fill_inode(struct inode *, struct buffer_head *);
54 static int udf_sync_inode(struct inode *inode);
55 static int udf_alloc_i_data(struct inode *inode, size_t size);
56 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
58 struct kernel_lb_addr, uint32_t);
59 static void udf_split_extents(struct inode *, int *, int, int,
60 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
61 static void udf_prealloc_extents(struct inode *, int, int,
62 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
63 static void udf_merge_extents(struct inode *,
64 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
65 static void udf_update_extents(struct inode *,
66 struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
67 struct extent_position *);
68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
69
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 */
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 */
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 */
113 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
114 struct extent_position *pos, int next_epos)
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,
124 sizeof(struct extent_position));
125 iinfo->cached_extent.lstart = estart;
126 if (next_epos)
127 switch (iinfo->i_alloc_type) {
128 case ICBTAG_FLAG_AD_SHORT:
129 iinfo->cached_extent.epos.offset -=
130 sizeof(struct short_ad);
131 break;
132 case ICBTAG_FLAG_AD_LONG:
133 iinfo->cached_extent.epos.offset -=
134 sizeof(struct long_ad);
135 }
136 spin_unlock(&iinfo->i_extent_cache_lock);
137 }
138
139 void udf_evict_inode(struct inode *inode)
140 {
141 struct udf_inode_info *iinfo = UDF_I(inode);
142 int want_delete = 0;
143
144 if (!inode->i_nlink && !is_bad_inode(inode)) {
145 want_delete = 1;
146 udf_setsize(inode, 0);
147 udf_update_inode(inode, IS_SYNC(inode));
148 } else
149 truncate_inode_pages(&inode->i_data, 0);
150 invalidate_inode_buffers(inode);
151 clear_inode(inode);
152 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
153 inode->i_size != iinfo->i_lenExtents) {
154 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
155 inode->i_ino, inode->i_mode,
156 (unsigned long long)inode->i_size,
157 (unsigned long long)iinfo->i_lenExtents);
158 }
159 kfree(iinfo->i_ext.i_data);
160 iinfo->i_ext.i_data = NULL;
161 udf_clear_extent_cache(inode);
162 if (want_delete) {
163 udf_free_inode(inode);
164 }
165 }
166
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, to, 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
184 static int udf_writepage(struct page *page, struct writeback_control *wbc)
185 {
186 return block_write_full_page(page, udf_get_block, wbc);
187 }
188
189 static int udf_writepages(struct address_space *mapping,
190 struct writeback_control *wbc)
191 {
192 return mpage_writepages(mapping, wbc, udf_get_block);
193 }
194
195 static int udf_readpage(struct file *file, struct page *page)
196 {
197 return mpage_readpage(page, udf_get_block);
198 }
199
200 static int udf_readpages(struct file *file, struct address_space *mapping,
201 struct list_head *pages, unsigned nr_pages)
202 {
203 return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
204 }
205
206 static int udf_write_begin(struct file *file, struct address_space *mapping,
207 loff_t pos, unsigned len, unsigned flags,
208 struct page **pagep, void **fsdata)
209 {
210 int ret;
211
212 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
213 if (unlikely(ret))
214 udf_write_failed(mapping, pos + len);
215 return ret;
216 }
217
218 static ssize_t udf_direct_IO(int rw, struct kiocb *iocb,
219 const struct iovec *iov,
220 loff_t offset, unsigned long nr_segs)
221 {
222 struct file *file = iocb->ki_filp;
223 struct address_space *mapping = file->f_mapping;
224 struct inode *inode = mapping->host;
225 ssize_t ret;
226
227 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
228 udf_get_block);
229 if (unlikely(ret < 0 && (rw & WRITE)))
230 udf_write_failed(mapping, offset + iov_length(iov, nr_segs));
231 return ret;
232 }
233
234 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
235 {
236 return generic_block_bmap(mapping, block, udf_get_block);
237 }
238
239 const struct address_space_operations udf_aops = {
240 .readpage = udf_readpage,
241 .readpages = udf_readpages,
242 .writepage = udf_writepage,
243 .writepages = udf_writepages,
244 .write_begin = udf_write_begin,
245 .write_end = generic_write_end,
246 .direct_IO = udf_direct_IO,
247 .bmap = udf_bmap,
248 };
249
250 /*
251 * Expand file stored in ICB to a normal one-block-file
252 *
253 * This function requires i_data_sem for writing and releases it.
254 * This function requires i_mutex held
255 */
256 int udf_expand_file_adinicb(struct inode *inode)
257 {
258 struct page *page;
259 char *kaddr;
260 struct udf_inode_info *iinfo = UDF_I(inode);
261 int err;
262 struct writeback_control udf_wbc = {
263 .sync_mode = WB_SYNC_NONE,
264 .nr_to_write = 1,
265 };
266
267 if (!iinfo->i_lenAlloc) {
268 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
269 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
270 else
271 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
272 /* from now on we have normal address_space methods */
273 inode->i_data.a_ops = &udf_aops;
274 up_write(&iinfo->i_data_sem);
275 mark_inode_dirty(inode);
276 return 0;
277 }
278 /*
279 * Release i_data_sem so that we can lock a page - page lock ranks
280 * above i_data_sem. i_mutex still protects us against file changes.
281 */
282 up_write(&iinfo->i_data_sem);
283
284 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
285 if (!page)
286 return -ENOMEM;
287
288 if (!PageUptodate(page)) {
289 kaddr = kmap(page);
290 memset(kaddr + iinfo->i_lenAlloc, 0x00,
291 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
292 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
293 iinfo->i_lenAlloc);
294 flush_dcache_page(page);
295 SetPageUptodate(page);
296 kunmap(page);
297 }
298 down_write(&iinfo->i_data_sem);
299 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
300 iinfo->i_lenAlloc);
301 iinfo->i_lenAlloc = 0;
302 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
303 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
304 else
305 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
306 /* from now on we have normal address_space methods */
307 inode->i_data.a_ops = &udf_aops;
308 up_write(&iinfo->i_data_sem);
309 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
310 if (err) {
311 /* Restore everything back so that we don't lose data... */
312 lock_page(page);
313 kaddr = kmap(page);
314 down_write(&iinfo->i_data_sem);
315 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
316 inode->i_size);
317 kunmap(page);
318 unlock_page(page);
319 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
320 inode->i_data.a_ops = &udf_adinicb_aops;
321 up_write(&iinfo->i_data_sem);
322 }
323 page_cache_release(page);
324 mark_inode_dirty(inode);
325
326 return err;
327 }
328
329 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
330 int *err)
331 {
332 int newblock;
333 struct buffer_head *dbh = NULL;
334 struct kernel_lb_addr eloc;
335 uint8_t alloctype;
336 struct extent_position epos;
337
338 struct udf_fileident_bh sfibh, dfibh;
339 loff_t f_pos = udf_ext0_offset(inode);
340 int size = udf_ext0_offset(inode) + inode->i_size;
341 struct fileIdentDesc cfi, *sfi, *dfi;
342 struct udf_inode_info *iinfo = UDF_I(inode);
343
344 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
345 alloctype = ICBTAG_FLAG_AD_SHORT;
346 else
347 alloctype = ICBTAG_FLAG_AD_LONG;
348
349 if (!inode->i_size) {
350 iinfo->i_alloc_type = alloctype;
351 mark_inode_dirty(inode);
352 return NULL;
353 }
354
355 /* alloc block, and copy data to it */
356 *block = udf_new_block(inode->i_sb, inode,
357 iinfo->i_location.partitionReferenceNum,
358 iinfo->i_location.logicalBlockNum, err);
359 if (!(*block))
360 return NULL;
361 newblock = udf_get_pblock(inode->i_sb, *block,
362 iinfo->i_location.partitionReferenceNum,
363 0);
364 if (!newblock)
365 return NULL;
366 dbh = udf_tgetblk(inode->i_sb, newblock);
367 if (!dbh)
368 return NULL;
369 lock_buffer(dbh);
370 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
371 set_buffer_uptodate(dbh);
372 unlock_buffer(dbh);
373 mark_buffer_dirty_inode(dbh, inode);
374
375 sfibh.soffset = sfibh.eoffset =
376 f_pos & (inode->i_sb->s_blocksize - 1);
377 sfibh.sbh = sfibh.ebh = NULL;
378 dfibh.soffset = dfibh.eoffset = 0;
379 dfibh.sbh = dfibh.ebh = dbh;
380 while (f_pos < size) {
381 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
382 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
383 NULL, NULL, NULL);
384 if (!sfi) {
385 brelse(dbh);
386 return NULL;
387 }
388 iinfo->i_alloc_type = alloctype;
389 sfi->descTag.tagLocation = cpu_to_le32(*block);
390 dfibh.soffset = dfibh.eoffset;
391 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
392 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
393 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
394 sfi->fileIdent +
395 le16_to_cpu(sfi->lengthOfImpUse))) {
396 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
397 brelse(dbh);
398 return NULL;
399 }
400 }
401 mark_buffer_dirty_inode(dbh, inode);
402
403 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
404 iinfo->i_lenAlloc);
405 iinfo->i_lenAlloc = 0;
406 eloc.logicalBlockNum = *block;
407 eloc.partitionReferenceNum =
408 iinfo->i_location.partitionReferenceNum;
409 iinfo->i_lenExtents = inode->i_size;
410 epos.bh = NULL;
411 epos.block = iinfo->i_location;
412 epos.offset = udf_file_entry_alloc_offset(inode);
413 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
414 /* UniqueID stuff */
415
416 brelse(epos.bh);
417 mark_inode_dirty(inode);
418 return dbh;
419 }
420
421 static int udf_get_block(struct inode *inode, sector_t block,
422 struct buffer_head *bh_result, int create)
423 {
424 int err, new;
425 sector_t phys = 0;
426 struct udf_inode_info *iinfo;
427
428 if (!create) {
429 phys = udf_block_map(inode, block);
430 if (phys)
431 map_bh(bh_result, inode->i_sb, phys);
432 return 0;
433 }
434
435 err = -EIO;
436 new = 0;
437 iinfo = UDF_I(inode);
438
439 down_write(&iinfo->i_data_sem);
440 if (block == iinfo->i_next_alloc_block + 1) {
441 iinfo->i_next_alloc_block++;
442 iinfo->i_next_alloc_goal++;
443 }
444
445 udf_clear_extent_cache(inode);
446 phys = inode_getblk(inode, block, &err, &new);
447 if (!phys)
448 goto abort;
449
450 if (new)
451 set_buffer_new(bh_result);
452 map_bh(bh_result, inode->i_sb, phys);
453
454 abort:
455 up_write(&iinfo->i_data_sem);
456 return err;
457 }
458
459 static struct buffer_head *udf_getblk(struct inode *inode, long block,
460 int create, int *err)
461 {
462 struct buffer_head *bh;
463 struct buffer_head dummy;
464
465 dummy.b_state = 0;
466 dummy.b_blocknr = -1000;
467 *err = udf_get_block(inode, block, &dummy, create);
468 if (!*err && buffer_mapped(&dummy)) {
469 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
470 if (buffer_new(&dummy)) {
471 lock_buffer(bh);
472 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
473 set_buffer_uptodate(bh);
474 unlock_buffer(bh);
475 mark_buffer_dirty_inode(bh, inode);
476 }
477 return bh;
478 }
479
480 return NULL;
481 }
482
483 /* Extend the file by 'blocks' blocks, return the number of extents added */
484 static int udf_do_extend_file(struct inode *inode,
485 struct extent_position *last_pos,
486 struct kernel_long_ad *last_ext,
487 sector_t blocks)
488 {
489 sector_t add;
490 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
491 struct super_block *sb = inode->i_sb;
492 struct kernel_lb_addr prealloc_loc = {};
493 int prealloc_len = 0;
494 struct udf_inode_info *iinfo;
495 int err;
496
497 /* The previous extent is fake and we should not extend by anything
498 * - there's nothing to do... */
499 if (!blocks && fake)
500 return 0;
501
502 iinfo = UDF_I(inode);
503 /* Round the last extent up to a multiple of block size */
504 if (last_ext->extLength & (sb->s_blocksize - 1)) {
505 last_ext->extLength =
506 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
507 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
508 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
509 iinfo->i_lenExtents =
510 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
511 ~(sb->s_blocksize - 1);
512 }
513
514 /* Last extent are just preallocated blocks? */
515 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
516 EXT_NOT_RECORDED_ALLOCATED) {
517 /* Save the extent so that we can reattach it to the end */
518 prealloc_loc = last_ext->extLocation;
519 prealloc_len = last_ext->extLength;
520 /* Mark the extent as a hole */
521 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
522 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
523 last_ext->extLocation.logicalBlockNum = 0;
524 last_ext->extLocation.partitionReferenceNum = 0;
525 }
526
527 /* Can we merge with the previous extent? */
528 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
529 EXT_NOT_RECORDED_NOT_ALLOCATED) {
530 add = ((1 << 30) - sb->s_blocksize -
531 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
532 sb->s_blocksize_bits;
533 if (add > blocks)
534 add = blocks;
535 blocks -= add;
536 last_ext->extLength += add << sb->s_blocksize_bits;
537 }
538
539 if (fake) {
540 udf_add_aext(inode, last_pos, &last_ext->extLocation,
541 last_ext->extLength, 1);
542 count++;
543 } else
544 udf_write_aext(inode, last_pos, &last_ext->extLocation,
545 last_ext->extLength, 1);
546
547 /* Managed to do everything necessary? */
548 if (!blocks)
549 goto out;
550
551 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
552 last_ext->extLocation.logicalBlockNum = 0;
553 last_ext->extLocation.partitionReferenceNum = 0;
554 add = (1 << (30-sb->s_blocksize_bits)) - 1;
555 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
556 (add << sb->s_blocksize_bits);
557
558 /* Create enough extents to cover the whole hole */
559 while (blocks > add) {
560 blocks -= add;
561 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
562 last_ext->extLength, 1);
563 if (err)
564 return err;
565 count++;
566 }
567 if (blocks) {
568 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
569 (blocks << sb->s_blocksize_bits);
570 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
571 last_ext->extLength, 1);
572 if (err)
573 return err;
574 count++;
575 }
576
577 out:
578 /* Do we have some preallocated blocks saved? */
579 if (prealloc_len) {
580 err = udf_add_aext(inode, last_pos, &prealloc_loc,
581 prealloc_len, 1);
582 if (err)
583 return err;
584 last_ext->extLocation = prealloc_loc;
585 last_ext->extLength = prealloc_len;
586 count++;
587 }
588
589 /* last_pos should point to the last written extent... */
590 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
591 last_pos->offset -= sizeof(struct short_ad);
592 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
593 last_pos->offset -= sizeof(struct long_ad);
594 else
595 return -EIO;
596
597 return count;
598 }
599
600 static int udf_extend_file(struct inode *inode, loff_t newsize)
601 {
602
603 struct extent_position epos;
604 struct kernel_lb_addr eloc;
605 uint32_t elen;
606 int8_t etype;
607 struct super_block *sb = inode->i_sb;
608 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
609 int adsize;
610 struct udf_inode_info *iinfo = UDF_I(inode);
611 struct kernel_long_ad extent;
612 int err;
613
614 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
615 adsize = sizeof(struct short_ad);
616 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
617 adsize = sizeof(struct long_ad);
618 else
619 BUG();
620
621 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
622
623 /* File has extent covering the new size (could happen when extending
624 * inside a block)? */
625 if (etype != -1)
626 return 0;
627 if (newsize & (sb->s_blocksize - 1))
628 offset++;
629 /* Extended file just to the boundary of the last file block? */
630 if (offset == 0)
631 return 0;
632
633 /* Truncate is extending the file by 'offset' blocks */
634 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
635 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
636 /* File has no extents at all or has empty last
637 * indirect extent! Create a fake extent... */
638 extent.extLocation.logicalBlockNum = 0;
639 extent.extLocation.partitionReferenceNum = 0;
640 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
641 } else {
642 epos.offset -= adsize;
643 etype = udf_next_aext(inode, &epos, &extent.extLocation,
644 &extent.extLength, 0);
645 extent.extLength |= etype << 30;
646 }
647 err = udf_do_extend_file(inode, &epos, &extent, offset);
648 if (err < 0)
649 goto out;
650 err = 0;
651 iinfo->i_lenExtents = newsize;
652 out:
653 brelse(epos.bh);
654 return err;
655 }
656
657 static sector_t inode_getblk(struct inode *inode, sector_t block,
658 int *err, int *new)
659 {
660 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
661 struct extent_position prev_epos, cur_epos, next_epos;
662 int count = 0, startnum = 0, endnum = 0;
663 uint32_t elen = 0, tmpelen;
664 struct kernel_lb_addr eloc, tmpeloc;
665 int c = 1;
666 loff_t lbcount = 0, b_off = 0;
667 uint32_t newblocknum, newblock;
668 sector_t offset = 0;
669 int8_t etype;
670 struct udf_inode_info *iinfo = UDF_I(inode);
671 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
672 int lastblock = 0;
673 bool isBeyondEOF;
674
675 *err = 0;
676 *new = 0;
677 prev_epos.offset = udf_file_entry_alloc_offset(inode);
678 prev_epos.block = iinfo->i_location;
679 prev_epos.bh = NULL;
680 cur_epos = next_epos = prev_epos;
681 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
682
683 /* find the extent which contains the block we are looking for.
684 alternate between laarr[0] and laarr[1] for locations of the
685 current extent, and the previous extent */
686 do {
687 if (prev_epos.bh != cur_epos.bh) {
688 brelse(prev_epos.bh);
689 get_bh(cur_epos.bh);
690 prev_epos.bh = cur_epos.bh;
691 }
692 if (cur_epos.bh != next_epos.bh) {
693 brelse(cur_epos.bh);
694 get_bh(next_epos.bh);
695 cur_epos.bh = next_epos.bh;
696 }
697
698 lbcount += elen;
699
700 prev_epos.block = cur_epos.block;
701 cur_epos.block = next_epos.block;
702
703 prev_epos.offset = cur_epos.offset;
704 cur_epos.offset = next_epos.offset;
705
706 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
707 if (etype == -1)
708 break;
709
710 c = !c;
711
712 laarr[c].extLength = (etype << 30) | elen;
713 laarr[c].extLocation = eloc;
714
715 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
716 pgoal = eloc.logicalBlockNum +
717 ((elen + inode->i_sb->s_blocksize - 1) >>
718 inode->i_sb->s_blocksize_bits);
719
720 count++;
721 } while (lbcount + elen <= b_off);
722
723 b_off -= lbcount;
724 offset = b_off >> inode->i_sb->s_blocksize_bits;
725 /*
726 * Move prev_epos and cur_epos into indirect extent if we are at
727 * the pointer to it
728 */
729 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
730 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
731
732 /* if the extent is allocated and recorded, return the block
733 if the extent is not a multiple of the blocksize, round up */
734
735 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
736 if (elen & (inode->i_sb->s_blocksize - 1)) {
737 elen = EXT_RECORDED_ALLOCATED |
738 ((elen + inode->i_sb->s_blocksize - 1) &
739 ~(inode->i_sb->s_blocksize - 1));
740 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
741 }
742 brelse(prev_epos.bh);
743 brelse(cur_epos.bh);
744 brelse(next_epos.bh);
745 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
746 return newblock;
747 }
748
749 /* Are we beyond EOF? */
750 if (etype == -1) {
751 int ret;
752 isBeyondEOF = 1;
753 if (count) {
754 if (c)
755 laarr[0] = laarr[1];
756 startnum = 1;
757 } else {
758 /* Create a fake extent when there's not one */
759 memset(&laarr[0].extLocation, 0x00,
760 sizeof(struct kernel_lb_addr));
761 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
762 /* Will udf_do_extend_file() create real extent from
763 a fake one? */
764 startnum = (offset > 0);
765 }
766 /* Create extents for the hole between EOF and offset */
767 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
768 if (ret < 0) {
769 brelse(prev_epos.bh);
770 brelse(cur_epos.bh);
771 brelse(next_epos.bh);
772 *err = ret;
773 return 0;
774 }
775 c = 0;
776 offset = 0;
777 count += ret;
778 /* We are not covered by a preallocated extent? */
779 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
780 EXT_NOT_RECORDED_ALLOCATED) {
781 /* Is there any real extent? - otherwise we overwrite
782 * the fake one... */
783 if (count)
784 c = !c;
785 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
786 inode->i_sb->s_blocksize;
787 memset(&laarr[c].extLocation, 0x00,
788 sizeof(struct kernel_lb_addr));
789 count++;
790 }
791 endnum = c + 1;
792 lastblock = 1;
793 } else {
794 isBeyondEOF = 0;
795 endnum = startnum = ((count > 2) ? 2 : count);
796
797 /* if the current extent is in position 0,
798 swap it with the previous */
799 if (!c && count != 1) {
800 laarr[2] = laarr[0];
801 laarr[0] = laarr[1];
802 laarr[1] = laarr[2];
803 c = 1;
804 }
805
806 /* if the current block is located in an extent,
807 read the next extent */
808 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
809 if (etype != -1) {
810 laarr[c + 1].extLength = (etype << 30) | elen;
811 laarr[c + 1].extLocation = eloc;
812 count++;
813 startnum++;
814 endnum++;
815 } else
816 lastblock = 1;
817 }
818
819 /* if the current extent is not recorded but allocated, get the
820 * block in the extent corresponding to the requested block */
821 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
822 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
823 else { /* otherwise, allocate a new block */
824 if (iinfo->i_next_alloc_block == block)
825 goal = iinfo->i_next_alloc_goal;
826
827 if (!goal) {
828 if (!(goal = pgoal)) /* XXX: what was intended here? */
829 goal = iinfo->i_location.logicalBlockNum + 1;
830 }
831
832 newblocknum = udf_new_block(inode->i_sb, inode,
833 iinfo->i_location.partitionReferenceNum,
834 goal, err);
835 if (!newblocknum) {
836 brelse(prev_epos.bh);
837 brelse(cur_epos.bh);
838 brelse(next_epos.bh);
839 *err = -ENOSPC;
840 return 0;
841 }
842 if (isBeyondEOF)
843 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
844 }
845
846 /* if the extent the requsted block is located in contains multiple
847 * blocks, split the extent into at most three extents. blocks prior
848 * to requested block, requested block, and blocks after requested
849 * block */
850 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
851
852 #ifdef UDF_PREALLOCATE
853 /* We preallocate blocks only for regular files. It also makes sense
854 * for directories but there's a problem when to drop the
855 * preallocation. We might use some delayed work for that but I feel
856 * it's overengineering for a filesystem like UDF. */
857 if (S_ISREG(inode->i_mode))
858 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
859 #endif
860
861 /* merge any continuous blocks in laarr */
862 udf_merge_extents(inode, laarr, &endnum);
863
864 /* write back the new extents, inserting new extents if the new number
865 * of extents is greater than the old number, and deleting extents if
866 * the new number of extents is less than the old number */
867 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
868
869 brelse(prev_epos.bh);
870 brelse(cur_epos.bh);
871 brelse(next_epos.bh);
872
873 newblock = udf_get_pblock(inode->i_sb, newblocknum,
874 iinfo->i_location.partitionReferenceNum, 0);
875 if (!newblock) {
876 *err = -EIO;
877 return 0;
878 }
879 *new = 1;
880 iinfo->i_next_alloc_block = block;
881 iinfo->i_next_alloc_goal = newblocknum;
882 inode->i_ctime = current_fs_time(inode->i_sb);
883
884 if (IS_SYNC(inode))
885 udf_sync_inode(inode);
886 else
887 mark_inode_dirty(inode);
888
889 return newblock;
890 }
891
892 static void udf_split_extents(struct inode *inode, int *c, int offset,
893 int newblocknum,
894 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
895 int *endnum)
896 {
897 unsigned long blocksize = inode->i_sb->s_blocksize;
898 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
899
900 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
901 (laarr[*c].extLength >> 30) ==
902 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
903 int curr = *c;
904 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
905 blocksize - 1) >> blocksize_bits;
906 int8_t etype = (laarr[curr].extLength >> 30);
907
908 if (blen == 1)
909 ;
910 else if (!offset || blen == offset + 1) {
911 laarr[curr + 2] = laarr[curr + 1];
912 laarr[curr + 1] = laarr[curr];
913 } else {
914 laarr[curr + 3] = laarr[curr + 1];
915 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
916 }
917
918 if (offset) {
919 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
920 udf_free_blocks(inode->i_sb, inode,
921 &laarr[curr].extLocation,
922 0, offset);
923 laarr[curr].extLength =
924 EXT_NOT_RECORDED_NOT_ALLOCATED |
925 (offset << blocksize_bits);
926 laarr[curr].extLocation.logicalBlockNum = 0;
927 laarr[curr].extLocation.
928 partitionReferenceNum = 0;
929 } else
930 laarr[curr].extLength = (etype << 30) |
931 (offset << blocksize_bits);
932 curr++;
933 (*c)++;
934 (*endnum)++;
935 }
936
937 laarr[curr].extLocation.logicalBlockNum = newblocknum;
938 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
939 laarr[curr].extLocation.partitionReferenceNum =
940 UDF_I(inode)->i_location.partitionReferenceNum;
941 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
942 blocksize;
943 curr++;
944
945 if (blen != offset + 1) {
946 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
947 laarr[curr].extLocation.logicalBlockNum +=
948 offset + 1;
949 laarr[curr].extLength = (etype << 30) |
950 ((blen - (offset + 1)) << blocksize_bits);
951 curr++;
952 (*endnum)++;
953 }
954 }
955 }
956
957 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
958 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
959 int *endnum)
960 {
961 int start, length = 0, currlength = 0, i;
962
963 if (*endnum >= (c + 1)) {
964 if (!lastblock)
965 return;
966 else
967 start = c;
968 } else {
969 if ((laarr[c + 1].extLength >> 30) ==
970 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
971 start = c + 1;
972 length = currlength =
973 (((laarr[c + 1].extLength &
974 UDF_EXTENT_LENGTH_MASK) +
975 inode->i_sb->s_blocksize - 1) >>
976 inode->i_sb->s_blocksize_bits);
977 } else
978 start = c;
979 }
980
981 for (i = start + 1; i <= *endnum; i++) {
982 if (i == *endnum) {
983 if (lastblock)
984 length += UDF_DEFAULT_PREALLOC_BLOCKS;
985 } else if ((laarr[i].extLength >> 30) ==
986 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
987 length += (((laarr[i].extLength &
988 UDF_EXTENT_LENGTH_MASK) +
989 inode->i_sb->s_blocksize - 1) >>
990 inode->i_sb->s_blocksize_bits);
991 } else
992 break;
993 }
994
995 if (length) {
996 int next = laarr[start].extLocation.logicalBlockNum +
997 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
998 inode->i_sb->s_blocksize - 1) >>
999 inode->i_sb->s_blocksize_bits);
1000 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1001 laarr[start].extLocation.partitionReferenceNum,
1002 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1003 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1004 currlength);
1005 if (numalloc) {
1006 if (start == (c + 1))
1007 laarr[start].extLength +=
1008 (numalloc <<
1009 inode->i_sb->s_blocksize_bits);
1010 else {
1011 memmove(&laarr[c + 2], &laarr[c + 1],
1012 sizeof(struct long_ad) * (*endnum - (c + 1)));
1013 (*endnum)++;
1014 laarr[c + 1].extLocation.logicalBlockNum = next;
1015 laarr[c + 1].extLocation.partitionReferenceNum =
1016 laarr[c].extLocation.
1017 partitionReferenceNum;
1018 laarr[c + 1].extLength =
1019 EXT_NOT_RECORDED_ALLOCATED |
1020 (numalloc <<
1021 inode->i_sb->s_blocksize_bits);
1022 start = c + 1;
1023 }
1024
1025 for (i = start + 1; numalloc && i < *endnum; i++) {
1026 int elen = ((laarr[i].extLength &
1027 UDF_EXTENT_LENGTH_MASK) +
1028 inode->i_sb->s_blocksize - 1) >>
1029 inode->i_sb->s_blocksize_bits;
1030
1031 if (elen > numalloc) {
1032 laarr[i].extLength -=
1033 (numalloc <<
1034 inode->i_sb->s_blocksize_bits);
1035 numalloc = 0;
1036 } else {
1037 numalloc -= elen;
1038 if (*endnum > (i + 1))
1039 memmove(&laarr[i],
1040 &laarr[i + 1],
1041 sizeof(struct long_ad) *
1042 (*endnum - (i + 1)));
1043 i--;
1044 (*endnum)--;
1045 }
1046 }
1047 UDF_I(inode)->i_lenExtents +=
1048 numalloc << inode->i_sb->s_blocksize_bits;
1049 }
1050 }
1051 }
1052
1053 static void udf_merge_extents(struct inode *inode,
1054 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1055 int *endnum)
1056 {
1057 int i;
1058 unsigned long blocksize = inode->i_sb->s_blocksize;
1059 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1060
1061 for (i = 0; i < (*endnum - 1); i++) {
1062 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1063 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1064
1065 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1066 (((li->extLength >> 30) ==
1067 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1068 ((lip1->extLocation.logicalBlockNum -
1069 li->extLocation.logicalBlockNum) ==
1070 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1071 blocksize - 1) >> blocksize_bits)))) {
1072
1073 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1074 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1075 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1076 lip1->extLength = (lip1->extLength -
1077 (li->extLength &
1078 UDF_EXTENT_LENGTH_MASK) +
1079 UDF_EXTENT_LENGTH_MASK) &
1080 ~(blocksize - 1);
1081 li->extLength = (li->extLength &
1082 UDF_EXTENT_FLAG_MASK) +
1083 (UDF_EXTENT_LENGTH_MASK + 1) -
1084 blocksize;
1085 lip1->extLocation.logicalBlockNum =
1086 li->extLocation.logicalBlockNum +
1087 ((li->extLength &
1088 UDF_EXTENT_LENGTH_MASK) >>
1089 blocksize_bits);
1090 } else {
1091 li->extLength = lip1->extLength +
1092 (((li->extLength &
1093 UDF_EXTENT_LENGTH_MASK) +
1094 blocksize - 1) & ~(blocksize - 1));
1095 if (*endnum > (i + 2))
1096 memmove(&laarr[i + 1], &laarr[i + 2],
1097 sizeof(struct long_ad) *
1098 (*endnum - (i + 2)));
1099 i--;
1100 (*endnum)--;
1101 }
1102 } else if (((li->extLength >> 30) ==
1103 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1104 ((lip1->extLength >> 30) ==
1105 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1106 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1107 ((li->extLength &
1108 UDF_EXTENT_LENGTH_MASK) +
1109 blocksize - 1) >> blocksize_bits);
1110 li->extLocation.logicalBlockNum = 0;
1111 li->extLocation.partitionReferenceNum = 0;
1112
1113 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1114 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1115 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1116 lip1->extLength = (lip1->extLength -
1117 (li->extLength &
1118 UDF_EXTENT_LENGTH_MASK) +
1119 UDF_EXTENT_LENGTH_MASK) &
1120 ~(blocksize - 1);
1121 li->extLength = (li->extLength &
1122 UDF_EXTENT_FLAG_MASK) +
1123 (UDF_EXTENT_LENGTH_MASK + 1) -
1124 blocksize;
1125 } else {
1126 li->extLength = lip1->extLength +
1127 (((li->extLength &
1128 UDF_EXTENT_LENGTH_MASK) +
1129 blocksize - 1) & ~(blocksize - 1));
1130 if (*endnum > (i + 2))
1131 memmove(&laarr[i + 1], &laarr[i + 2],
1132 sizeof(struct long_ad) *
1133 (*endnum - (i + 2)));
1134 i--;
1135 (*endnum)--;
1136 }
1137 } else if ((li->extLength >> 30) ==
1138 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1139 udf_free_blocks(inode->i_sb, inode,
1140 &li->extLocation, 0,
1141 ((li->extLength &
1142 UDF_EXTENT_LENGTH_MASK) +
1143 blocksize - 1) >> blocksize_bits);
1144 li->extLocation.logicalBlockNum = 0;
1145 li->extLocation.partitionReferenceNum = 0;
1146 li->extLength = (li->extLength &
1147 UDF_EXTENT_LENGTH_MASK) |
1148 EXT_NOT_RECORDED_NOT_ALLOCATED;
1149 }
1150 }
1151 }
1152
1153 static void udf_update_extents(struct inode *inode,
1154 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1155 int startnum, int endnum,
1156 struct extent_position *epos)
1157 {
1158 int start = 0, i;
1159 struct kernel_lb_addr tmploc;
1160 uint32_t tmplen;
1161
1162 if (startnum > endnum) {
1163 for (i = 0; i < (startnum - endnum); i++)
1164 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1165 laarr[i].extLength);
1166 } else if (startnum < endnum) {
1167 for (i = 0; i < (endnum - startnum); i++) {
1168 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1169 laarr[i].extLength);
1170 udf_next_aext(inode, epos, &laarr[i].extLocation,
1171 &laarr[i].extLength, 1);
1172 start++;
1173 }
1174 }
1175
1176 for (i = start; i < endnum; i++) {
1177 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1178 udf_write_aext(inode, epos, &laarr[i].extLocation,
1179 laarr[i].extLength, 1);
1180 }
1181 }
1182
1183 struct buffer_head *udf_bread(struct inode *inode, int block,
1184 int create, int *err)
1185 {
1186 struct buffer_head *bh = NULL;
1187
1188 bh = udf_getblk(inode, block, create, err);
1189 if (!bh)
1190 return NULL;
1191
1192 if (buffer_uptodate(bh))
1193 return bh;
1194
1195 ll_rw_block(READ, 1, &bh);
1196
1197 wait_on_buffer(bh);
1198 if (buffer_uptodate(bh))
1199 return bh;
1200
1201 brelse(bh);
1202 *err = -EIO;
1203 return NULL;
1204 }
1205
1206 int udf_setsize(struct inode *inode, loff_t newsize)
1207 {
1208 int err;
1209 struct udf_inode_info *iinfo;
1210 int bsize = 1 << inode->i_blkbits;
1211
1212 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1213 S_ISLNK(inode->i_mode)))
1214 return -EINVAL;
1215 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1216 return -EPERM;
1217
1218 iinfo = UDF_I(inode);
1219 if (newsize > inode->i_size) {
1220 down_write(&iinfo->i_data_sem);
1221 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1222 if (bsize <
1223 (udf_file_entry_alloc_offset(inode) + newsize)) {
1224 err = udf_expand_file_adinicb(inode);
1225 if (err)
1226 return err;
1227 down_write(&iinfo->i_data_sem);
1228 } else {
1229 iinfo->i_lenAlloc = newsize;
1230 goto set_size;
1231 }
1232 }
1233 err = udf_extend_file(inode, newsize);
1234 if (err) {
1235 up_write(&iinfo->i_data_sem);
1236 return err;
1237 }
1238 set_size:
1239 truncate_setsize(inode, newsize);
1240 up_write(&iinfo->i_data_sem);
1241 } else {
1242 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1243 down_write(&iinfo->i_data_sem);
1244 udf_clear_extent_cache(inode);
1245 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1246 0x00, bsize - newsize -
1247 udf_file_entry_alloc_offset(inode));
1248 iinfo->i_lenAlloc = newsize;
1249 truncate_setsize(inode, newsize);
1250 up_write(&iinfo->i_data_sem);
1251 goto update_time;
1252 }
1253 err = block_truncate_page(inode->i_mapping, newsize,
1254 udf_get_block);
1255 if (err)
1256 return err;
1257 down_write(&iinfo->i_data_sem);
1258 udf_clear_extent_cache(inode);
1259 truncate_setsize(inode, newsize);
1260 udf_truncate_extents(inode);
1261 up_write(&iinfo->i_data_sem);
1262 }
1263 update_time:
1264 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1265 if (IS_SYNC(inode))
1266 udf_sync_inode(inode);
1267 else
1268 mark_inode_dirty(inode);
1269 return 0;
1270 }
1271
1272 static void __udf_read_inode(struct inode *inode)
1273 {
1274 struct buffer_head *bh = NULL;
1275 struct fileEntry *fe;
1276 uint16_t ident;
1277 struct udf_inode_info *iinfo = UDF_I(inode);
1278
1279 /*
1280 * Set defaults, but the inode is still incomplete!
1281 * Note: get_new_inode() sets the following on a new inode:
1282 * i_sb = sb
1283 * i_no = ino
1284 * i_flags = sb->s_flags
1285 * i_state = 0
1286 * clean_inode(): zero fills and sets
1287 * i_count = 1
1288 * i_nlink = 1
1289 * i_op = NULL;
1290 */
1291 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1292 if (!bh) {
1293 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1294 make_bad_inode(inode);
1295 return;
1296 }
1297
1298 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1299 ident != TAG_IDENT_USE) {
1300 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1301 inode->i_ino, ident);
1302 brelse(bh);
1303 make_bad_inode(inode);
1304 return;
1305 }
1306
1307 fe = (struct fileEntry *)bh->b_data;
1308
1309 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1310 struct buffer_head *ibh;
1311
1312 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1313 &ident);
1314 if (ident == TAG_IDENT_IE && ibh) {
1315 struct buffer_head *nbh = NULL;
1316 struct kernel_lb_addr loc;
1317 struct indirectEntry *ie;
1318
1319 ie = (struct indirectEntry *)ibh->b_data;
1320 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1321
1322 if (ie->indirectICB.extLength &&
1323 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1324 &ident))) {
1325 if (ident == TAG_IDENT_FE ||
1326 ident == TAG_IDENT_EFE) {
1327 memcpy(&iinfo->i_location,
1328 &loc,
1329 sizeof(struct kernel_lb_addr));
1330 brelse(bh);
1331 brelse(ibh);
1332 brelse(nbh);
1333 __udf_read_inode(inode);
1334 return;
1335 }
1336 brelse(nbh);
1337 }
1338 }
1339 brelse(ibh);
1340 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1341 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1342 le16_to_cpu(fe->icbTag.strategyType));
1343 brelse(bh);
1344 make_bad_inode(inode);
1345 return;
1346 }
1347 udf_fill_inode(inode, bh);
1348
1349 brelse(bh);
1350 }
1351
1352 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1353 {
1354 struct fileEntry *fe;
1355 struct extendedFileEntry *efe;
1356 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1357 struct udf_inode_info *iinfo = UDF_I(inode);
1358 unsigned int link_count;
1359
1360 fe = (struct fileEntry *)bh->b_data;
1361 efe = (struct extendedFileEntry *)bh->b_data;
1362
1363 if (fe->icbTag.strategyType == cpu_to_le16(4))
1364 iinfo->i_strat4096 = 0;
1365 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1366 iinfo->i_strat4096 = 1;
1367
1368 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1369 ICBTAG_FLAG_AD_MASK;
1370 iinfo->i_unique = 0;
1371 iinfo->i_lenEAttr = 0;
1372 iinfo->i_lenExtents = 0;
1373 iinfo->i_lenAlloc = 0;
1374 iinfo->i_next_alloc_block = 0;
1375 iinfo->i_next_alloc_goal = 0;
1376 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1377 iinfo->i_efe = 1;
1378 iinfo->i_use = 0;
1379 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1380 sizeof(struct extendedFileEntry))) {
1381 make_bad_inode(inode);
1382 return;
1383 }
1384 memcpy(iinfo->i_ext.i_data,
1385 bh->b_data + sizeof(struct extendedFileEntry),
1386 inode->i_sb->s_blocksize -
1387 sizeof(struct extendedFileEntry));
1388 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1389 iinfo->i_efe = 0;
1390 iinfo->i_use = 0;
1391 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1392 sizeof(struct fileEntry))) {
1393 make_bad_inode(inode);
1394 return;
1395 }
1396 memcpy(iinfo->i_ext.i_data,
1397 bh->b_data + sizeof(struct fileEntry),
1398 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1399 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1400 iinfo->i_efe = 0;
1401 iinfo->i_use = 1;
1402 iinfo->i_lenAlloc = le32_to_cpu(
1403 ((struct unallocSpaceEntry *)bh->b_data)->
1404 lengthAllocDescs);
1405 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1406 sizeof(struct unallocSpaceEntry))) {
1407 make_bad_inode(inode);
1408 return;
1409 }
1410 memcpy(iinfo->i_ext.i_data,
1411 bh->b_data + sizeof(struct unallocSpaceEntry),
1412 inode->i_sb->s_blocksize -
1413 sizeof(struct unallocSpaceEntry));
1414 return;
1415 }
1416
1417 read_lock(&sbi->s_cred_lock);
1418 i_uid_write(inode, le32_to_cpu(fe->uid));
1419 if (!uid_valid(inode->i_uid) ||
1420 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1421 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1422 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1423
1424 i_gid_write(inode, le32_to_cpu(fe->gid));
1425 if (!gid_valid(inode->i_gid) ||
1426 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1427 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1428 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1429
1430 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1431 sbi->s_fmode != UDF_INVALID_MODE)
1432 inode->i_mode = sbi->s_fmode;
1433 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1434 sbi->s_dmode != UDF_INVALID_MODE)
1435 inode->i_mode = sbi->s_dmode;
1436 else
1437 inode->i_mode = udf_convert_permissions(fe);
1438 inode->i_mode &= ~sbi->s_umask;
1439 read_unlock(&sbi->s_cred_lock);
1440
1441 link_count = le16_to_cpu(fe->fileLinkCount);
1442 if (!link_count)
1443 link_count = 1;
1444 set_nlink(inode, link_count);
1445
1446 inode->i_size = le64_to_cpu(fe->informationLength);
1447 iinfo->i_lenExtents = inode->i_size;
1448
1449 if (iinfo->i_efe == 0) {
1450 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1451 (inode->i_sb->s_blocksize_bits - 9);
1452
1453 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1454 inode->i_atime = sbi->s_record_time;
1455
1456 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1457 fe->modificationTime))
1458 inode->i_mtime = sbi->s_record_time;
1459
1460 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1461 inode->i_ctime = sbi->s_record_time;
1462
1463 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1464 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1465 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1466 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1467 } else {
1468 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1469 (inode->i_sb->s_blocksize_bits - 9);
1470
1471 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1472 inode->i_atime = sbi->s_record_time;
1473
1474 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1475 efe->modificationTime))
1476 inode->i_mtime = sbi->s_record_time;
1477
1478 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1479 iinfo->i_crtime = sbi->s_record_time;
1480
1481 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1482 inode->i_ctime = sbi->s_record_time;
1483
1484 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1485 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1486 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1487 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1488 }
1489
1490 switch (fe->icbTag.fileType) {
1491 case ICBTAG_FILE_TYPE_DIRECTORY:
1492 inode->i_op = &udf_dir_inode_operations;
1493 inode->i_fop = &udf_dir_operations;
1494 inode->i_mode |= S_IFDIR;
1495 inc_nlink(inode);
1496 break;
1497 case ICBTAG_FILE_TYPE_REALTIME:
1498 case ICBTAG_FILE_TYPE_REGULAR:
1499 case ICBTAG_FILE_TYPE_UNDEF:
1500 case ICBTAG_FILE_TYPE_VAT20:
1501 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1502 inode->i_data.a_ops = &udf_adinicb_aops;
1503 else
1504 inode->i_data.a_ops = &udf_aops;
1505 inode->i_op = &udf_file_inode_operations;
1506 inode->i_fop = &udf_file_operations;
1507 inode->i_mode |= S_IFREG;
1508 break;
1509 case ICBTAG_FILE_TYPE_BLOCK:
1510 inode->i_mode |= S_IFBLK;
1511 break;
1512 case ICBTAG_FILE_TYPE_CHAR:
1513 inode->i_mode |= S_IFCHR;
1514 break;
1515 case ICBTAG_FILE_TYPE_FIFO:
1516 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1517 break;
1518 case ICBTAG_FILE_TYPE_SOCKET:
1519 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1520 break;
1521 case ICBTAG_FILE_TYPE_SYMLINK:
1522 inode->i_data.a_ops = &udf_symlink_aops;
1523 inode->i_op = &udf_symlink_inode_operations;
1524 inode->i_mode = S_IFLNK | S_IRWXUGO;
1525 break;
1526 case ICBTAG_FILE_TYPE_MAIN:
1527 udf_debug("METADATA FILE-----\n");
1528 break;
1529 case ICBTAG_FILE_TYPE_MIRROR:
1530 udf_debug("METADATA MIRROR FILE-----\n");
1531 break;
1532 case ICBTAG_FILE_TYPE_BITMAP:
1533 udf_debug("METADATA BITMAP FILE-----\n");
1534 break;
1535 default:
1536 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1537 inode->i_ino, fe->icbTag.fileType);
1538 make_bad_inode(inode);
1539 return;
1540 }
1541 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1542 struct deviceSpec *dsea =
1543 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1544 if (dsea) {
1545 init_special_inode(inode, inode->i_mode,
1546 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1547 le32_to_cpu(dsea->minorDeviceIdent)));
1548 /* Developer ID ??? */
1549 } else
1550 make_bad_inode(inode);
1551 }
1552 }
1553
1554 static int udf_alloc_i_data(struct inode *inode, size_t size)
1555 {
1556 struct udf_inode_info *iinfo = UDF_I(inode);
1557 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1558
1559 if (!iinfo->i_ext.i_data) {
1560 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1561 inode->i_ino);
1562 return -ENOMEM;
1563 }
1564
1565 return 0;
1566 }
1567
1568 static umode_t udf_convert_permissions(struct fileEntry *fe)
1569 {
1570 umode_t mode;
1571 uint32_t permissions;
1572 uint32_t flags;
1573
1574 permissions = le32_to_cpu(fe->permissions);
1575 flags = le16_to_cpu(fe->icbTag.flags);
1576
1577 mode = ((permissions) & S_IRWXO) |
1578 ((permissions >> 2) & S_IRWXG) |
1579 ((permissions >> 4) & S_IRWXU) |
1580 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1581 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1582 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1583
1584 return mode;
1585 }
1586
1587 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1588 {
1589 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1590 }
1591
1592 static int udf_sync_inode(struct inode *inode)
1593 {
1594 return udf_update_inode(inode, 1);
1595 }
1596
1597 static int udf_update_inode(struct inode *inode, int do_sync)
1598 {
1599 struct buffer_head *bh = NULL;
1600 struct fileEntry *fe;
1601 struct extendedFileEntry *efe;
1602 uint64_t lb_recorded;
1603 uint32_t udfperms;
1604 uint16_t icbflags;
1605 uint16_t crclen;
1606 int err = 0;
1607 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1608 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1609 struct udf_inode_info *iinfo = UDF_I(inode);
1610
1611 bh = udf_tgetblk(inode->i_sb,
1612 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1613 if (!bh) {
1614 udf_debug("getblk failure\n");
1615 return -ENOMEM;
1616 }
1617
1618 lock_buffer(bh);
1619 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1620 fe = (struct fileEntry *)bh->b_data;
1621 efe = (struct extendedFileEntry *)bh->b_data;
1622
1623 if (iinfo->i_use) {
1624 struct unallocSpaceEntry *use =
1625 (struct unallocSpaceEntry *)bh->b_data;
1626
1627 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1628 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1629 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1630 sizeof(struct unallocSpaceEntry));
1631 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1632 use->descTag.tagLocation =
1633 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1634 crclen = sizeof(struct unallocSpaceEntry) +
1635 iinfo->i_lenAlloc - sizeof(struct tag);
1636 use->descTag.descCRCLength = cpu_to_le16(crclen);
1637 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1638 sizeof(struct tag),
1639 crclen));
1640 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1641
1642 goto out;
1643 }
1644
1645 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1646 fe->uid = cpu_to_le32(-1);
1647 else
1648 fe->uid = cpu_to_le32(i_uid_read(inode));
1649
1650 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1651 fe->gid = cpu_to_le32(-1);
1652 else
1653 fe->gid = cpu_to_le32(i_gid_read(inode));
1654
1655 udfperms = ((inode->i_mode & S_IRWXO)) |
1656 ((inode->i_mode & S_IRWXG) << 2) |
1657 ((inode->i_mode & S_IRWXU) << 4);
1658
1659 udfperms |= (le32_to_cpu(fe->permissions) &
1660 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1661 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1662 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1663 fe->permissions = cpu_to_le32(udfperms);
1664
1665 if (S_ISDIR(inode->i_mode))
1666 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1667 else
1668 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1669
1670 fe->informationLength = cpu_to_le64(inode->i_size);
1671
1672 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1673 struct regid *eid;
1674 struct deviceSpec *dsea =
1675 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1676 if (!dsea) {
1677 dsea = (struct deviceSpec *)
1678 udf_add_extendedattr(inode,
1679 sizeof(struct deviceSpec) +
1680 sizeof(struct regid), 12, 0x3);
1681 dsea->attrType = cpu_to_le32(12);
1682 dsea->attrSubtype = 1;
1683 dsea->attrLength = cpu_to_le32(
1684 sizeof(struct deviceSpec) +
1685 sizeof(struct regid));
1686 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1687 }
1688 eid = (struct regid *)dsea->impUse;
1689 memset(eid, 0, sizeof(struct regid));
1690 strcpy(eid->ident, UDF_ID_DEVELOPER);
1691 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1692 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1693 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1694 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1695 }
1696
1697 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1698 lb_recorded = 0; /* No extents => no blocks! */
1699 else
1700 lb_recorded =
1701 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1702 (blocksize_bits - 9);
1703
1704 if (iinfo->i_efe == 0) {
1705 memcpy(bh->b_data + sizeof(struct fileEntry),
1706 iinfo->i_ext.i_data,
1707 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1708 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1709
1710 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1711 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1712 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1713 memset(&(fe->impIdent), 0, sizeof(struct regid));
1714 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1715 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1716 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1717 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1718 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1719 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1720 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1721 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1722 crclen = sizeof(struct fileEntry);
1723 } else {
1724 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1725 iinfo->i_ext.i_data,
1726 inode->i_sb->s_blocksize -
1727 sizeof(struct extendedFileEntry));
1728 efe->objectSize = cpu_to_le64(inode->i_size);
1729 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1730
1731 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1732 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1733 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1734 iinfo->i_crtime = inode->i_atime;
1735
1736 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1737 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1738 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1739 iinfo->i_crtime = inode->i_mtime;
1740
1741 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1742 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1743 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1744 iinfo->i_crtime = inode->i_ctime;
1745
1746 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1747 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1748 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1749 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1750
1751 memset(&(efe->impIdent), 0, sizeof(struct regid));
1752 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1753 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1754 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1755 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1756 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1757 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1758 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1759 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1760 crclen = sizeof(struct extendedFileEntry);
1761 }
1762 if (iinfo->i_strat4096) {
1763 fe->icbTag.strategyType = cpu_to_le16(4096);
1764 fe->icbTag.strategyParameter = cpu_to_le16(1);
1765 fe->icbTag.numEntries = cpu_to_le16(2);
1766 } else {
1767 fe->icbTag.strategyType = cpu_to_le16(4);
1768 fe->icbTag.numEntries = cpu_to_le16(1);
1769 }
1770
1771 if (S_ISDIR(inode->i_mode))
1772 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1773 else if (S_ISREG(inode->i_mode))
1774 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1775 else if (S_ISLNK(inode->i_mode))
1776 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1777 else if (S_ISBLK(inode->i_mode))
1778 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1779 else if (S_ISCHR(inode->i_mode))
1780 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1781 else if (S_ISFIFO(inode->i_mode))
1782 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1783 else if (S_ISSOCK(inode->i_mode))
1784 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1785
1786 icbflags = iinfo->i_alloc_type |
1787 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1788 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1789 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1790 (le16_to_cpu(fe->icbTag.flags) &
1791 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1792 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1793
1794 fe->icbTag.flags = cpu_to_le16(icbflags);
1795 if (sbi->s_udfrev >= 0x0200)
1796 fe->descTag.descVersion = cpu_to_le16(3);
1797 else
1798 fe->descTag.descVersion = cpu_to_le16(2);
1799 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1800 fe->descTag.tagLocation = cpu_to_le32(
1801 iinfo->i_location.logicalBlockNum);
1802 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1803 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1804 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1805 crclen));
1806 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1807
1808 out:
1809 set_buffer_uptodate(bh);
1810 unlock_buffer(bh);
1811
1812 /* write the data blocks */
1813 mark_buffer_dirty(bh);
1814 if (do_sync) {
1815 sync_dirty_buffer(bh);
1816 if (buffer_write_io_error(bh)) {
1817 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1818 inode->i_ino);
1819 err = -EIO;
1820 }
1821 }
1822 brelse(bh);
1823
1824 return err;
1825 }
1826
1827 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1828 {
1829 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1830 struct inode *inode = iget_locked(sb, block);
1831
1832 if (!inode)
1833 return NULL;
1834
1835 if (inode->i_state & I_NEW) {
1836 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1837 __udf_read_inode(inode);
1838 unlock_new_inode(inode);
1839 }
1840
1841 if (is_bad_inode(inode))
1842 goto out_iput;
1843
1844 if (ino->logicalBlockNum >= UDF_SB(sb)->
1845 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1846 udf_debug("block=%d, partition=%d out of range\n",
1847 ino->logicalBlockNum, ino->partitionReferenceNum);
1848 make_bad_inode(inode);
1849 goto out_iput;
1850 }
1851
1852 return inode;
1853
1854 out_iput:
1855 iput(inode);
1856 return NULL;
1857 }
1858
1859 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1860 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1861 {
1862 int adsize;
1863 struct short_ad *sad = NULL;
1864 struct long_ad *lad = NULL;
1865 struct allocExtDesc *aed;
1866 uint8_t *ptr;
1867 struct udf_inode_info *iinfo = UDF_I(inode);
1868
1869 if (!epos->bh)
1870 ptr = iinfo->i_ext.i_data + epos->offset -
1871 udf_file_entry_alloc_offset(inode) +
1872 iinfo->i_lenEAttr;
1873 else
1874 ptr = epos->bh->b_data + epos->offset;
1875
1876 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1877 adsize = sizeof(struct short_ad);
1878 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1879 adsize = sizeof(struct long_ad);
1880 else
1881 return -EIO;
1882
1883 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1884 unsigned char *sptr, *dptr;
1885 struct buffer_head *nbh;
1886 int err, loffset;
1887 struct kernel_lb_addr obloc = epos->block;
1888
1889 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1890 obloc.partitionReferenceNum,
1891 obloc.logicalBlockNum, &err);
1892 if (!epos->block.logicalBlockNum)
1893 return -ENOSPC;
1894 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1895 &epos->block,
1896 0));
1897 if (!nbh)
1898 return -EIO;
1899 lock_buffer(nbh);
1900 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1901 set_buffer_uptodate(nbh);
1902 unlock_buffer(nbh);
1903 mark_buffer_dirty_inode(nbh, inode);
1904
1905 aed = (struct allocExtDesc *)(nbh->b_data);
1906 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1907 aed->previousAllocExtLocation =
1908 cpu_to_le32(obloc.logicalBlockNum);
1909 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1910 loffset = epos->offset;
1911 aed->lengthAllocDescs = cpu_to_le32(adsize);
1912 sptr = ptr - adsize;
1913 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1914 memcpy(dptr, sptr, adsize);
1915 epos->offset = sizeof(struct allocExtDesc) + adsize;
1916 } else {
1917 loffset = epos->offset + adsize;
1918 aed->lengthAllocDescs = cpu_to_le32(0);
1919 sptr = ptr;
1920 epos->offset = sizeof(struct allocExtDesc);
1921
1922 if (epos->bh) {
1923 aed = (struct allocExtDesc *)epos->bh->b_data;
1924 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1925 } else {
1926 iinfo->i_lenAlloc += adsize;
1927 mark_inode_dirty(inode);
1928 }
1929 }
1930 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1931 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1932 epos->block.logicalBlockNum, sizeof(struct tag));
1933 else
1934 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1935 epos->block.logicalBlockNum, sizeof(struct tag));
1936 switch (iinfo->i_alloc_type) {
1937 case ICBTAG_FLAG_AD_SHORT:
1938 sad = (struct short_ad *)sptr;
1939 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1940 inode->i_sb->s_blocksize);
1941 sad->extPosition =
1942 cpu_to_le32(epos->block.logicalBlockNum);
1943 break;
1944 case ICBTAG_FLAG_AD_LONG:
1945 lad = (struct long_ad *)sptr;
1946 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1947 inode->i_sb->s_blocksize);
1948 lad->extLocation = cpu_to_lelb(epos->block);
1949 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1950 break;
1951 }
1952 if (epos->bh) {
1953 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1954 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1955 udf_update_tag(epos->bh->b_data, loffset);
1956 else
1957 udf_update_tag(epos->bh->b_data,
1958 sizeof(struct allocExtDesc));
1959 mark_buffer_dirty_inode(epos->bh, inode);
1960 brelse(epos->bh);
1961 } else {
1962 mark_inode_dirty(inode);
1963 }
1964 epos->bh = nbh;
1965 }
1966
1967 udf_write_aext(inode, epos, eloc, elen, inc);
1968
1969 if (!epos->bh) {
1970 iinfo->i_lenAlloc += adsize;
1971 mark_inode_dirty(inode);
1972 } else {
1973 aed = (struct allocExtDesc *)epos->bh->b_data;
1974 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1975 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1976 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1977 udf_update_tag(epos->bh->b_data,
1978 epos->offset + (inc ? 0 : adsize));
1979 else
1980 udf_update_tag(epos->bh->b_data,
1981 sizeof(struct allocExtDesc));
1982 mark_buffer_dirty_inode(epos->bh, inode);
1983 }
1984
1985 return 0;
1986 }
1987
1988 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1989 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1990 {
1991 int adsize;
1992 uint8_t *ptr;
1993 struct short_ad *sad;
1994 struct long_ad *lad;
1995 struct udf_inode_info *iinfo = UDF_I(inode);
1996
1997 if (!epos->bh)
1998 ptr = iinfo->i_ext.i_data + epos->offset -
1999 udf_file_entry_alloc_offset(inode) +
2000 iinfo->i_lenEAttr;
2001 else
2002 ptr = epos->bh->b_data + epos->offset;
2003
2004 switch (iinfo->i_alloc_type) {
2005 case ICBTAG_FLAG_AD_SHORT:
2006 sad = (struct short_ad *)ptr;
2007 sad->extLength = cpu_to_le32(elen);
2008 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2009 adsize = sizeof(struct short_ad);
2010 break;
2011 case ICBTAG_FLAG_AD_LONG:
2012 lad = (struct long_ad *)ptr;
2013 lad->extLength = cpu_to_le32(elen);
2014 lad->extLocation = cpu_to_lelb(*eloc);
2015 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2016 adsize = sizeof(struct long_ad);
2017 break;
2018 default:
2019 return;
2020 }
2021
2022 if (epos->bh) {
2023 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2024 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2025 struct allocExtDesc *aed =
2026 (struct allocExtDesc *)epos->bh->b_data;
2027 udf_update_tag(epos->bh->b_data,
2028 le32_to_cpu(aed->lengthAllocDescs) +
2029 sizeof(struct allocExtDesc));
2030 }
2031 mark_buffer_dirty_inode(epos->bh, inode);
2032 } else {
2033 mark_inode_dirty(inode);
2034 }
2035
2036 if (inc)
2037 epos->offset += adsize;
2038 }
2039
2040 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2041 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2042 {
2043 int8_t etype;
2044
2045 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2046 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2047 int block;
2048 epos->block = *eloc;
2049 epos->offset = sizeof(struct allocExtDesc);
2050 brelse(epos->bh);
2051 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2052 epos->bh = udf_tread(inode->i_sb, block);
2053 if (!epos->bh) {
2054 udf_debug("reading block %d failed!\n", block);
2055 return -1;
2056 }
2057 }
2058
2059 return etype;
2060 }
2061
2062 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2063 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2064 {
2065 int alen;
2066 int8_t etype;
2067 uint8_t *ptr;
2068 struct short_ad *sad;
2069 struct long_ad *lad;
2070 struct udf_inode_info *iinfo = UDF_I(inode);
2071
2072 if (!epos->bh) {
2073 if (!epos->offset)
2074 epos->offset = udf_file_entry_alloc_offset(inode);
2075 ptr = iinfo->i_ext.i_data + epos->offset -
2076 udf_file_entry_alloc_offset(inode) +
2077 iinfo->i_lenEAttr;
2078 alen = udf_file_entry_alloc_offset(inode) +
2079 iinfo->i_lenAlloc;
2080 } else {
2081 if (!epos->offset)
2082 epos->offset = sizeof(struct allocExtDesc);
2083 ptr = epos->bh->b_data + epos->offset;
2084 alen = sizeof(struct allocExtDesc) +
2085 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2086 lengthAllocDescs);
2087 }
2088
2089 switch (iinfo->i_alloc_type) {
2090 case ICBTAG_FLAG_AD_SHORT:
2091 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2092 if (!sad)
2093 return -1;
2094 etype = le32_to_cpu(sad->extLength) >> 30;
2095 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2096 eloc->partitionReferenceNum =
2097 iinfo->i_location.partitionReferenceNum;
2098 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2099 break;
2100 case ICBTAG_FLAG_AD_LONG:
2101 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2102 if (!lad)
2103 return -1;
2104 etype = le32_to_cpu(lad->extLength) >> 30;
2105 *eloc = lelb_to_cpu(lad->extLocation);
2106 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2107 break;
2108 default:
2109 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2110 return -1;
2111 }
2112
2113 return etype;
2114 }
2115
2116 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2117 struct kernel_lb_addr neloc, uint32_t nelen)
2118 {
2119 struct kernel_lb_addr oeloc;
2120 uint32_t oelen;
2121 int8_t etype;
2122
2123 if (epos.bh)
2124 get_bh(epos.bh);
2125
2126 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2127 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2128 neloc = oeloc;
2129 nelen = (etype << 30) | oelen;
2130 }
2131 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2132 brelse(epos.bh);
2133
2134 return (nelen >> 30);
2135 }
2136
2137 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2138 struct kernel_lb_addr eloc, uint32_t elen)
2139 {
2140 struct extent_position oepos;
2141 int adsize;
2142 int8_t etype;
2143 struct allocExtDesc *aed;
2144 struct udf_inode_info *iinfo;
2145
2146 if (epos.bh) {
2147 get_bh(epos.bh);
2148 get_bh(epos.bh);
2149 }
2150
2151 iinfo = UDF_I(inode);
2152 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2153 adsize = sizeof(struct short_ad);
2154 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2155 adsize = sizeof(struct long_ad);
2156 else
2157 adsize = 0;
2158
2159 oepos = epos;
2160 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2161 return -1;
2162
2163 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2164 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2165 if (oepos.bh != epos.bh) {
2166 oepos.block = epos.block;
2167 brelse(oepos.bh);
2168 get_bh(epos.bh);
2169 oepos.bh = epos.bh;
2170 oepos.offset = epos.offset - adsize;
2171 }
2172 }
2173 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2174 elen = 0;
2175
2176 if (epos.bh != oepos.bh) {
2177 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2178 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2179 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2180 if (!oepos.bh) {
2181 iinfo->i_lenAlloc -= (adsize * 2);
2182 mark_inode_dirty(inode);
2183 } else {
2184 aed = (struct allocExtDesc *)oepos.bh->b_data;
2185 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2186 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2187 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2188 udf_update_tag(oepos.bh->b_data,
2189 oepos.offset - (2 * adsize));
2190 else
2191 udf_update_tag(oepos.bh->b_data,
2192 sizeof(struct allocExtDesc));
2193 mark_buffer_dirty_inode(oepos.bh, inode);
2194 }
2195 } else {
2196 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2197 if (!oepos.bh) {
2198 iinfo->i_lenAlloc -= adsize;
2199 mark_inode_dirty(inode);
2200 } else {
2201 aed = (struct allocExtDesc *)oepos.bh->b_data;
2202 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2203 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2204 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2205 udf_update_tag(oepos.bh->b_data,
2206 epos.offset - adsize);
2207 else
2208 udf_update_tag(oepos.bh->b_data,
2209 sizeof(struct allocExtDesc));
2210 mark_buffer_dirty_inode(oepos.bh, inode);
2211 }
2212 }
2213
2214 brelse(epos.bh);
2215 brelse(oepos.bh);
2216
2217 return (elen >> 30);
2218 }
2219
2220 int8_t inode_bmap(struct inode *inode, sector_t block,
2221 struct extent_position *pos, struct kernel_lb_addr *eloc,
2222 uint32_t *elen, sector_t *offset)
2223 {
2224 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2225 loff_t lbcount = 0, bcount =
2226 (loff_t) block << blocksize_bits;
2227 int8_t etype;
2228 struct udf_inode_info *iinfo;
2229
2230 iinfo = UDF_I(inode);
2231 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2232 pos->offset = 0;
2233 pos->block = iinfo->i_location;
2234 pos->bh = NULL;
2235 }
2236 *elen = 0;
2237 do {
2238 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2239 if (etype == -1) {
2240 *offset = (bcount - lbcount) >> blocksize_bits;
2241 iinfo->i_lenExtents = lbcount;
2242 return -1;
2243 }
2244 lbcount += *elen;
2245 } while (lbcount <= bcount);
2246 /* update extent cache */
2247 udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2248 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2249
2250 return etype;
2251 }
2252
2253 long udf_block_map(struct inode *inode, sector_t block)
2254 {
2255 struct kernel_lb_addr eloc;
2256 uint32_t elen;
2257 sector_t offset;
2258 struct extent_position epos = {};
2259 int ret;
2260
2261 down_read(&UDF_I(inode)->i_data_sem);
2262
2263 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2264 (EXT_RECORDED_ALLOCATED >> 30))
2265 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2266 else
2267 ret = 0;
2268
2269 up_read(&UDF_I(inode)->i_data_sem);
2270 brelse(epos.bh);
2271
2272 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2273 return udf_fixed_to_variable(ret);
2274 else
2275 return ret;
2276 }
Linus' kernel tree