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Merge branch 'pm-sleep'
[deliverable/linux.git] / fs / udf / inode.c
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
71 void udf_evict_inode(struct inode *inode)
72 {
73 struct udf_inode_info *iinfo = UDF_I(inode);
74 int want_delete = 0;
75
76 if (!inode->i_nlink && !is_bad_inode(inode)) {
77 want_delete = 1;
78 udf_setsize(inode, 0);
79 udf_update_inode(inode, IS_SYNC(inode));
80 } else
81 truncate_inode_pages(&inode->i_data, 0);
82 invalidate_inode_buffers(inode);
83 clear_inode(inode);
84 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
85 inode->i_size != iinfo->i_lenExtents) {
86 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",
87 inode->i_ino, inode->i_mode,
88 (unsigned long long)inode->i_size,
89 (unsigned long long)iinfo->i_lenExtents);
90 }
91 kfree(iinfo->i_ext.i_data);
92 iinfo->i_ext.i_data = NULL;
93 if (want_delete) {
94 udf_free_inode(inode);
95 }
96 }
97
98 static int udf_writepage(struct page *page, struct writeback_control *wbc)
99 {
100 return block_write_full_page(page, udf_get_block, wbc);
101 }
102
103 static int udf_readpage(struct file *file, struct page *page)
104 {
105 return mpage_readpage(page, udf_get_block);
106 }
107
108 static int udf_readpages(struct file *file, struct address_space *mapping,
109 struct list_head *pages, unsigned nr_pages)
110 {
111 return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
112 }
113
114 static int udf_write_begin(struct file *file, struct address_space *mapping,
115 loff_t pos, unsigned len, unsigned flags,
116 struct page **pagep, void **fsdata)
117 {
118 int ret;
119
120 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
121 if (unlikely(ret)) {
122 struct inode *inode = mapping->host;
123 struct udf_inode_info *iinfo = UDF_I(inode);
124 loff_t isize = inode->i_size;
125
126 if (pos + len > isize) {
127 truncate_pagecache(inode, pos + len, isize);
128 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
129 down_write(&iinfo->i_data_sem);
130 udf_truncate_extents(inode);
131 up_write(&iinfo->i_data_sem);
132 }
133 }
134 }
135
136 return ret;
137 }
138
139 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
140 {
141 return generic_block_bmap(mapping, block, udf_get_block);
142 }
143
144 const struct address_space_operations udf_aops = {
145 .readpage = udf_readpage,
146 .readpages = udf_readpages,
147 .writepage = udf_writepage,
148 .write_begin = udf_write_begin,
149 .write_end = generic_write_end,
150 .bmap = udf_bmap,
151 };
152
153 /*
154 * Expand file stored in ICB to a normal one-block-file
155 *
156 * This function requires i_data_sem for writing and releases it.
157 * This function requires i_mutex held
158 */
159 int udf_expand_file_adinicb(struct inode *inode)
160 {
161 struct page *page;
162 char *kaddr;
163 struct udf_inode_info *iinfo = UDF_I(inode);
164 int err;
165 struct writeback_control udf_wbc = {
166 .sync_mode = WB_SYNC_NONE,
167 .nr_to_write = 1,
168 };
169
170 if (!iinfo->i_lenAlloc) {
171 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
172 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
173 else
174 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
175 /* from now on we have normal address_space methods */
176 inode->i_data.a_ops = &udf_aops;
177 up_write(&iinfo->i_data_sem);
178 mark_inode_dirty(inode);
179 return 0;
180 }
181 /*
182 * Release i_data_sem so that we can lock a page - page lock ranks
183 * above i_data_sem. i_mutex still protects us against file changes.
184 */
185 up_write(&iinfo->i_data_sem);
186
187 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
188 if (!page)
189 return -ENOMEM;
190
191 if (!PageUptodate(page)) {
192 kaddr = kmap(page);
193 memset(kaddr + iinfo->i_lenAlloc, 0x00,
194 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
195 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
196 iinfo->i_lenAlloc);
197 flush_dcache_page(page);
198 SetPageUptodate(page);
199 kunmap(page);
200 }
201 down_write(&iinfo->i_data_sem);
202 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
203 iinfo->i_lenAlloc);
204 iinfo->i_lenAlloc = 0;
205 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
206 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
207 else
208 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
209 /* from now on we have normal address_space methods */
210 inode->i_data.a_ops = &udf_aops;
211 up_write(&iinfo->i_data_sem);
212 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
213 if (err) {
214 /* Restore everything back so that we don't lose data... */
215 lock_page(page);
216 kaddr = kmap(page);
217 down_write(&iinfo->i_data_sem);
218 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
219 inode->i_size);
220 kunmap(page);
221 unlock_page(page);
222 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
223 inode->i_data.a_ops = &udf_adinicb_aops;
224 up_write(&iinfo->i_data_sem);
225 }
226 page_cache_release(page);
227 mark_inode_dirty(inode);
228
229 return err;
230 }
231
232 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
233 int *err)
234 {
235 int newblock;
236 struct buffer_head *dbh = NULL;
237 struct kernel_lb_addr eloc;
238 uint8_t alloctype;
239 struct extent_position epos;
240
241 struct udf_fileident_bh sfibh, dfibh;
242 loff_t f_pos = udf_ext0_offset(inode);
243 int size = udf_ext0_offset(inode) + inode->i_size;
244 struct fileIdentDesc cfi, *sfi, *dfi;
245 struct udf_inode_info *iinfo = UDF_I(inode);
246
247 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
248 alloctype = ICBTAG_FLAG_AD_SHORT;
249 else
250 alloctype = ICBTAG_FLAG_AD_LONG;
251
252 if (!inode->i_size) {
253 iinfo->i_alloc_type = alloctype;
254 mark_inode_dirty(inode);
255 return NULL;
256 }
257
258 /* alloc block, and copy data to it */
259 *block = udf_new_block(inode->i_sb, inode,
260 iinfo->i_location.partitionReferenceNum,
261 iinfo->i_location.logicalBlockNum, err);
262 if (!(*block))
263 return NULL;
264 newblock = udf_get_pblock(inode->i_sb, *block,
265 iinfo->i_location.partitionReferenceNum,
266 0);
267 if (!newblock)
268 return NULL;
269 dbh = udf_tgetblk(inode->i_sb, newblock);
270 if (!dbh)
271 return NULL;
272 lock_buffer(dbh);
273 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
274 set_buffer_uptodate(dbh);
275 unlock_buffer(dbh);
276 mark_buffer_dirty_inode(dbh, inode);
277
278 sfibh.soffset = sfibh.eoffset =
279 f_pos & (inode->i_sb->s_blocksize - 1);
280 sfibh.sbh = sfibh.ebh = NULL;
281 dfibh.soffset = dfibh.eoffset = 0;
282 dfibh.sbh = dfibh.ebh = dbh;
283 while (f_pos < size) {
284 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
285 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
286 NULL, NULL, NULL);
287 if (!sfi) {
288 brelse(dbh);
289 return NULL;
290 }
291 iinfo->i_alloc_type = alloctype;
292 sfi->descTag.tagLocation = cpu_to_le32(*block);
293 dfibh.soffset = dfibh.eoffset;
294 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
295 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
296 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
297 sfi->fileIdent +
298 le16_to_cpu(sfi->lengthOfImpUse))) {
299 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
300 brelse(dbh);
301 return NULL;
302 }
303 }
304 mark_buffer_dirty_inode(dbh, inode);
305
306 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
307 iinfo->i_lenAlloc);
308 iinfo->i_lenAlloc = 0;
309 eloc.logicalBlockNum = *block;
310 eloc.partitionReferenceNum =
311 iinfo->i_location.partitionReferenceNum;
312 iinfo->i_lenExtents = inode->i_size;
313 epos.bh = NULL;
314 epos.block = iinfo->i_location;
315 epos.offset = udf_file_entry_alloc_offset(inode);
316 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
317 /* UniqueID stuff */
318
319 brelse(epos.bh);
320 mark_inode_dirty(inode);
321 return dbh;
322 }
323
324 static int udf_get_block(struct inode *inode, sector_t block,
325 struct buffer_head *bh_result, int create)
326 {
327 int err, new;
328 sector_t phys = 0;
329 struct udf_inode_info *iinfo;
330
331 if (!create) {
332 phys = udf_block_map(inode, block);
333 if (phys)
334 map_bh(bh_result, inode->i_sb, phys);
335 return 0;
336 }
337
338 err = -EIO;
339 new = 0;
340 iinfo = UDF_I(inode);
341
342 down_write(&iinfo->i_data_sem);
343 if (block == iinfo->i_next_alloc_block + 1) {
344 iinfo->i_next_alloc_block++;
345 iinfo->i_next_alloc_goal++;
346 }
347
348
349 phys = inode_getblk(inode, block, &err, &new);
350 if (!phys)
351 goto abort;
352
353 if (new)
354 set_buffer_new(bh_result);
355 map_bh(bh_result, inode->i_sb, phys);
356
357 abort:
358 up_write(&iinfo->i_data_sem);
359 return err;
360 }
361
362 static struct buffer_head *udf_getblk(struct inode *inode, long block,
363 int create, int *err)
364 {
365 struct buffer_head *bh;
366 struct buffer_head dummy;
367
368 dummy.b_state = 0;
369 dummy.b_blocknr = -1000;
370 *err = udf_get_block(inode, block, &dummy, create);
371 if (!*err && buffer_mapped(&dummy)) {
372 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
373 if (buffer_new(&dummy)) {
374 lock_buffer(bh);
375 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
376 set_buffer_uptodate(bh);
377 unlock_buffer(bh);
378 mark_buffer_dirty_inode(bh, inode);
379 }
380 return bh;
381 }
382
383 return NULL;
384 }
385
386 /* Extend the file by 'blocks' blocks, return the number of extents added */
387 static int udf_do_extend_file(struct inode *inode,
388 struct extent_position *last_pos,
389 struct kernel_long_ad *last_ext,
390 sector_t blocks)
391 {
392 sector_t add;
393 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
394 struct super_block *sb = inode->i_sb;
395 struct kernel_lb_addr prealloc_loc = {};
396 int prealloc_len = 0;
397 struct udf_inode_info *iinfo;
398 int err;
399
400 /* The previous extent is fake and we should not extend by anything
401 * - there's nothing to do... */
402 if (!blocks && fake)
403 return 0;
404
405 iinfo = UDF_I(inode);
406 /* Round the last extent up to a multiple of block size */
407 if (last_ext->extLength & (sb->s_blocksize - 1)) {
408 last_ext->extLength =
409 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
410 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
411 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
412 iinfo->i_lenExtents =
413 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
414 ~(sb->s_blocksize - 1);
415 }
416
417 /* Last extent are just preallocated blocks? */
418 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
419 EXT_NOT_RECORDED_ALLOCATED) {
420 /* Save the extent so that we can reattach it to the end */
421 prealloc_loc = last_ext->extLocation;
422 prealloc_len = last_ext->extLength;
423 /* Mark the extent as a hole */
424 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
425 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
426 last_ext->extLocation.logicalBlockNum = 0;
427 last_ext->extLocation.partitionReferenceNum = 0;
428 }
429
430 /* Can we merge with the previous extent? */
431 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
432 EXT_NOT_RECORDED_NOT_ALLOCATED) {
433 add = ((1 << 30) - sb->s_blocksize -
434 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
435 sb->s_blocksize_bits;
436 if (add > blocks)
437 add = blocks;
438 blocks -= add;
439 last_ext->extLength += add << sb->s_blocksize_bits;
440 }
441
442 if (fake) {
443 udf_add_aext(inode, last_pos, &last_ext->extLocation,
444 last_ext->extLength, 1);
445 count++;
446 } else
447 udf_write_aext(inode, last_pos, &last_ext->extLocation,
448 last_ext->extLength, 1);
449
450 /* Managed to do everything necessary? */
451 if (!blocks)
452 goto out;
453
454 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
455 last_ext->extLocation.logicalBlockNum = 0;
456 last_ext->extLocation.partitionReferenceNum = 0;
457 add = (1 << (30-sb->s_blocksize_bits)) - 1;
458 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
459 (add << sb->s_blocksize_bits);
460
461 /* Create enough extents to cover the whole hole */
462 while (blocks > add) {
463 blocks -= add;
464 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
465 last_ext->extLength, 1);
466 if (err)
467 return err;
468 count++;
469 }
470 if (blocks) {
471 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
472 (blocks << sb->s_blocksize_bits);
473 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
474 last_ext->extLength, 1);
475 if (err)
476 return err;
477 count++;
478 }
479
480 out:
481 /* Do we have some preallocated blocks saved? */
482 if (prealloc_len) {
483 err = udf_add_aext(inode, last_pos, &prealloc_loc,
484 prealloc_len, 1);
485 if (err)
486 return err;
487 last_ext->extLocation = prealloc_loc;
488 last_ext->extLength = prealloc_len;
489 count++;
490 }
491
492 /* last_pos should point to the last written extent... */
493 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
494 last_pos->offset -= sizeof(struct short_ad);
495 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
496 last_pos->offset -= sizeof(struct long_ad);
497 else
498 return -EIO;
499
500 return count;
501 }
502
503 static int udf_extend_file(struct inode *inode, loff_t newsize)
504 {
505
506 struct extent_position epos;
507 struct kernel_lb_addr eloc;
508 uint32_t elen;
509 int8_t etype;
510 struct super_block *sb = inode->i_sb;
511 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
512 int adsize;
513 struct udf_inode_info *iinfo = UDF_I(inode);
514 struct kernel_long_ad extent;
515 int err;
516
517 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
518 adsize = sizeof(struct short_ad);
519 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
520 adsize = sizeof(struct long_ad);
521 else
522 BUG();
523
524 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
525
526 /* File has extent covering the new size (could happen when extending
527 * inside a block)? */
528 if (etype != -1)
529 return 0;
530 if (newsize & (sb->s_blocksize - 1))
531 offset++;
532 /* Extended file just to the boundary of the last file block? */
533 if (offset == 0)
534 return 0;
535
536 /* Truncate is extending the file by 'offset' blocks */
537 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
538 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
539 /* File has no extents at all or has empty last
540 * indirect extent! Create a fake extent... */
541 extent.extLocation.logicalBlockNum = 0;
542 extent.extLocation.partitionReferenceNum = 0;
543 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
544 } else {
545 epos.offset -= adsize;
546 etype = udf_next_aext(inode, &epos, &extent.extLocation,
547 &extent.extLength, 0);
548 extent.extLength |= etype << 30;
549 }
550 err = udf_do_extend_file(inode, &epos, &extent, offset);
551 if (err < 0)
552 goto out;
553 err = 0;
554 iinfo->i_lenExtents = newsize;
555 out:
556 brelse(epos.bh);
557 return err;
558 }
559
560 static sector_t inode_getblk(struct inode *inode, sector_t block,
561 int *err, int *new)
562 {
563 static sector_t last_block;
564 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
565 struct extent_position prev_epos, cur_epos, next_epos;
566 int count = 0, startnum = 0, endnum = 0;
567 uint32_t elen = 0, tmpelen;
568 struct kernel_lb_addr eloc, tmpeloc;
569 int c = 1;
570 loff_t lbcount = 0, b_off = 0;
571 uint32_t newblocknum, newblock;
572 sector_t offset = 0;
573 int8_t etype;
574 struct udf_inode_info *iinfo = UDF_I(inode);
575 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
576 int lastblock = 0;
577
578 *err = 0;
579 *new = 0;
580 prev_epos.offset = udf_file_entry_alloc_offset(inode);
581 prev_epos.block = iinfo->i_location;
582 prev_epos.bh = NULL;
583 cur_epos = next_epos = prev_epos;
584 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
585
586 /* find the extent which contains the block we are looking for.
587 alternate between laarr[0] and laarr[1] for locations of the
588 current extent, and the previous extent */
589 do {
590 if (prev_epos.bh != cur_epos.bh) {
591 brelse(prev_epos.bh);
592 get_bh(cur_epos.bh);
593 prev_epos.bh = cur_epos.bh;
594 }
595 if (cur_epos.bh != next_epos.bh) {
596 brelse(cur_epos.bh);
597 get_bh(next_epos.bh);
598 cur_epos.bh = next_epos.bh;
599 }
600
601 lbcount += elen;
602
603 prev_epos.block = cur_epos.block;
604 cur_epos.block = next_epos.block;
605
606 prev_epos.offset = cur_epos.offset;
607 cur_epos.offset = next_epos.offset;
608
609 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
610 if (etype == -1)
611 break;
612
613 c = !c;
614
615 laarr[c].extLength = (etype << 30) | elen;
616 laarr[c].extLocation = eloc;
617
618 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
619 pgoal = eloc.logicalBlockNum +
620 ((elen + inode->i_sb->s_blocksize - 1) >>
621 inode->i_sb->s_blocksize_bits);
622
623 count++;
624 } while (lbcount + elen <= b_off);
625
626 b_off -= lbcount;
627 offset = b_off >> inode->i_sb->s_blocksize_bits;
628 /*
629 * Move prev_epos and cur_epos into indirect extent if we are at
630 * the pointer to it
631 */
632 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
633 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
634
635 /* if the extent is allocated and recorded, return the block
636 if the extent is not a multiple of the blocksize, round up */
637
638 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
639 if (elen & (inode->i_sb->s_blocksize - 1)) {
640 elen = EXT_RECORDED_ALLOCATED |
641 ((elen + inode->i_sb->s_blocksize - 1) &
642 ~(inode->i_sb->s_blocksize - 1));
643 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
644 }
645 brelse(prev_epos.bh);
646 brelse(cur_epos.bh);
647 brelse(next_epos.bh);
648 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
649 return newblock;
650 }
651
652 last_block = block;
653 /* Are we beyond EOF? */
654 if (etype == -1) {
655 int ret;
656
657 if (count) {
658 if (c)
659 laarr[0] = laarr[1];
660 startnum = 1;
661 } else {
662 /* Create a fake extent when there's not one */
663 memset(&laarr[0].extLocation, 0x00,
664 sizeof(struct kernel_lb_addr));
665 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
666 /* Will udf_do_extend_file() create real extent from
667 a fake one? */
668 startnum = (offset > 0);
669 }
670 /* Create extents for the hole between EOF and offset */
671 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
672 if (ret < 0) {
673 brelse(prev_epos.bh);
674 brelse(cur_epos.bh);
675 brelse(next_epos.bh);
676 *err = ret;
677 return 0;
678 }
679 c = 0;
680 offset = 0;
681 count += ret;
682 /* We are not covered by a preallocated extent? */
683 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
684 EXT_NOT_RECORDED_ALLOCATED) {
685 /* Is there any real extent? - otherwise we overwrite
686 * the fake one... */
687 if (count)
688 c = !c;
689 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
690 inode->i_sb->s_blocksize;
691 memset(&laarr[c].extLocation, 0x00,
692 sizeof(struct kernel_lb_addr));
693 count++;
694 endnum++;
695 }
696 endnum = c + 1;
697 lastblock = 1;
698 } else {
699 endnum = startnum = ((count > 2) ? 2 : count);
700
701 /* if the current extent is in position 0,
702 swap it with the previous */
703 if (!c && count != 1) {
704 laarr[2] = laarr[0];
705 laarr[0] = laarr[1];
706 laarr[1] = laarr[2];
707 c = 1;
708 }
709
710 /* if the current block is located in an extent,
711 read the next extent */
712 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
713 if (etype != -1) {
714 laarr[c + 1].extLength = (etype << 30) | elen;
715 laarr[c + 1].extLocation = eloc;
716 count++;
717 startnum++;
718 endnum++;
719 } else
720 lastblock = 1;
721 }
722
723 /* if the current extent is not recorded but allocated, get the
724 * block in the extent corresponding to the requested block */
725 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
726 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
727 else { /* otherwise, allocate a new block */
728 if (iinfo->i_next_alloc_block == block)
729 goal = iinfo->i_next_alloc_goal;
730
731 if (!goal) {
732 if (!(goal = pgoal)) /* XXX: what was intended here? */
733 goal = iinfo->i_location.logicalBlockNum + 1;
734 }
735
736 newblocknum = udf_new_block(inode->i_sb, inode,
737 iinfo->i_location.partitionReferenceNum,
738 goal, err);
739 if (!newblocknum) {
740 brelse(prev_epos.bh);
741 *err = -ENOSPC;
742 return 0;
743 }
744 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
745 }
746
747 /* if the extent the requsted block is located in contains multiple
748 * blocks, split the extent into at most three extents. blocks prior
749 * to requested block, requested block, and blocks after requested
750 * block */
751 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
752
753 #ifdef UDF_PREALLOCATE
754 /* We preallocate blocks only for regular files. It also makes sense
755 * for directories but there's a problem when to drop the
756 * preallocation. We might use some delayed work for that but I feel
757 * it's overengineering for a filesystem like UDF. */
758 if (S_ISREG(inode->i_mode))
759 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
760 #endif
761
762 /* merge any continuous blocks in laarr */
763 udf_merge_extents(inode, laarr, &endnum);
764
765 /* write back the new extents, inserting new extents if the new number
766 * of extents is greater than the old number, and deleting extents if
767 * the new number of extents is less than the old number */
768 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
769
770 brelse(prev_epos.bh);
771
772 newblock = udf_get_pblock(inode->i_sb, newblocknum,
773 iinfo->i_location.partitionReferenceNum, 0);
774 if (!newblock) {
775 *err = -EIO;
776 return 0;
777 }
778 *new = 1;
779 iinfo->i_next_alloc_block = block;
780 iinfo->i_next_alloc_goal = newblocknum;
781 inode->i_ctime = current_fs_time(inode->i_sb);
782
783 if (IS_SYNC(inode))
784 udf_sync_inode(inode);
785 else
786 mark_inode_dirty(inode);
787
788 return newblock;
789 }
790
791 static void udf_split_extents(struct inode *inode, int *c, int offset,
792 int newblocknum,
793 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
794 int *endnum)
795 {
796 unsigned long blocksize = inode->i_sb->s_blocksize;
797 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
798
799 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
800 (laarr[*c].extLength >> 30) ==
801 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
802 int curr = *c;
803 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
804 blocksize - 1) >> blocksize_bits;
805 int8_t etype = (laarr[curr].extLength >> 30);
806
807 if (blen == 1)
808 ;
809 else if (!offset || blen == offset + 1) {
810 laarr[curr + 2] = laarr[curr + 1];
811 laarr[curr + 1] = laarr[curr];
812 } else {
813 laarr[curr + 3] = laarr[curr + 1];
814 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
815 }
816
817 if (offset) {
818 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
819 udf_free_blocks(inode->i_sb, inode,
820 &laarr[curr].extLocation,
821 0, offset);
822 laarr[curr].extLength =
823 EXT_NOT_RECORDED_NOT_ALLOCATED |
824 (offset << blocksize_bits);
825 laarr[curr].extLocation.logicalBlockNum = 0;
826 laarr[curr].extLocation.
827 partitionReferenceNum = 0;
828 } else
829 laarr[curr].extLength = (etype << 30) |
830 (offset << blocksize_bits);
831 curr++;
832 (*c)++;
833 (*endnum)++;
834 }
835
836 laarr[curr].extLocation.logicalBlockNum = newblocknum;
837 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
838 laarr[curr].extLocation.partitionReferenceNum =
839 UDF_I(inode)->i_location.partitionReferenceNum;
840 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
841 blocksize;
842 curr++;
843
844 if (blen != offset + 1) {
845 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
846 laarr[curr].extLocation.logicalBlockNum +=
847 offset + 1;
848 laarr[curr].extLength = (etype << 30) |
849 ((blen - (offset + 1)) << blocksize_bits);
850 curr++;
851 (*endnum)++;
852 }
853 }
854 }
855
856 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
857 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
858 int *endnum)
859 {
860 int start, length = 0, currlength = 0, i;
861
862 if (*endnum >= (c + 1)) {
863 if (!lastblock)
864 return;
865 else
866 start = c;
867 } else {
868 if ((laarr[c + 1].extLength >> 30) ==
869 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
870 start = c + 1;
871 length = currlength =
872 (((laarr[c + 1].extLength &
873 UDF_EXTENT_LENGTH_MASK) +
874 inode->i_sb->s_blocksize - 1) >>
875 inode->i_sb->s_blocksize_bits);
876 } else
877 start = c;
878 }
879
880 for (i = start + 1; i <= *endnum; i++) {
881 if (i == *endnum) {
882 if (lastblock)
883 length += UDF_DEFAULT_PREALLOC_BLOCKS;
884 } else if ((laarr[i].extLength >> 30) ==
885 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
886 length += (((laarr[i].extLength &
887 UDF_EXTENT_LENGTH_MASK) +
888 inode->i_sb->s_blocksize - 1) >>
889 inode->i_sb->s_blocksize_bits);
890 } else
891 break;
892 }
893
894 if (length) {
895 int next = laarr[start].extLocation.logicalBlockNum +
896 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
897 inode->i_sb->s_blocksize - 1) >>
898 inode->i_sb->s_blocksize_bits);
899 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
900 laarr[start].extLocation.partitionReferenceNum,
901 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
902 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
903 currlength);
904 if (numalloc) {
905 if (start == (c + 1))
906 laarr[start].extLength +=
907 (numalloc <<
908 inode->i_sb->s_blocksize_bits);
909 else {
910 memmove(&laarr[c + 2], &laarr[c + 1],
911 sizeof(struct long_ad) * (*endnum - (c + 1)));
912 (*endnum)++;
913 laarr[c + 1].extLocation.logicalBlockNum = next;
914 laarr[c + 1].extLocation.partitionReferenceNum =
915 laarr[c].extLocation.
916 partitionReferenceNum;
917 laarr[c + 1].extLength =
918 EXT_NOT_RECORDED_ALLOCATED |
919 (numalloc <<
920 inode->i_sb->s_blocksize_bits);
921 start = c + 1;
922 }
923
924 for (i = start + 1; numalloc && i < *endnum; i++) {
925 int elen = ((laarr[i].extLength &
926 UDF_EXTENT_LENGTH_MASK) +
927 inode->i_sb->s_blocksize - 1) >>
928 inode->i_sb->s_blocksize_bits;
929
930 if (elen > numalloc) {
931 laarr[i].extLength -=
932 (numalloc <<
933 inode->i_sb->s_blocksize_bits);
934 numalloc = 0;
935 } else {
936 numalloc -= elen;
937 if (*endnum > (i + 1))
938 memmove(&laarr[i],
939 &laarr[i + 1],
940 sizeof(struct long_ad) *
941 (*endnum - (i + 1)));
942 i--;
943 (*endnum)--;
944 }
945 }
946 UDF_I(inode)->i_lenExtents +=
947 numalloc << inode->i_sb->s_blocksize_bits;
948 }
949 }
950 }
951
952 static void udf_merge_extents(struct inode *inode,
953 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
954 int *endnum)
955 {
956 int i;
957 unsigned long blocksize = inode->i_sb->s_blocksize;
958 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
959
960 for (i = 0; i < (*endnum - 1); i++) {
961 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
962 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
963
964 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
965 (((li->extLength >> 30) ==
966 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
967 ((lip1->extLocation.logicalBlockNum -
968 li->extLocation.logicalBlockNum) ==
969 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
970 blocksize - 1) >> blocksize_bits)))) {
971
972 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
973 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
974 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
975 lip1->extLength = (lip1->extLength -
976 (li->extLength &
977 UDF_EXTENT_LENGTH_MASK) +
978 UDF_EXTENT_LENGTH_MASK) &
979 ~(blocksize - 1);
980 li->extLength = (li->extLength &
981 UDF_EXTENT_FLAG_MASK) +
982 (UDF_EXTENT_LENGTH_MASK + 1) -
983 blocksize;
984 lip1->extLocation.logicalBlockNum =
985 li->extLocation.logicalBlockNum +
986 ((li->extLength &
987 UDF_EXTENT_LENGTH_MASK) >>
988 blocksize_bits);
989 } else {
990 li->extLength = lip1->extLength +
991 (((li->extLength &
992 UDF_EXTENT_LENGTH_MASK) +
993 blocksize - 1) & ~(blocksize - 1));
994 if (*endnum > (i + 2))
995 memmove(&laarr[i + 1], &laarr[i + 2],
996 sizeof(struct long_ad) *
997 (*endnum - (i + 2)));
998 i--;
999 (*endnum)--;
1000 }
1001 } else if (((li->extLength >> 30) ==
1002 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1003 ((lip1->extLength >> 30) ==
1004 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1005 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1006 ((li->extLength &
1007 UDF_EXTENT_LENGTH_MASK) +
1008 blocksize - 1) >> blocksize_bits);
1009 li->extLocation.logicalBlockNum = 0;
1010 li->extLocation.partitionReferenceNum = 0;
1011
1012 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1013 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1014 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1015 lip1->extLength = (lip1->extLength -
1016 (li->extLength &
1017 UDF_EXTENT_LENGTH_MASK) +
1018 UDF_EXTENT_LENGTH_MASK) &
1019 ~(blocksize - 1);
1020 li->extLength = (li->extLength &
1021 UDF_EXTENT_FLAG_MASK) +
1022 (UDF_EXTENT_LENGTH_MASK + 1) -
1023 blocksize;
1024 } else {
1025 li->extLength = lip1->extLength +
1026 (((li->extLength &
1027 UDF_EXTENT_LENGTH_MASK) +
1028 blocksize - 1) & ~(blocksize - 1));
1029 if (*endnum > (i + 2))
1030 memmove(&laarr[i + 1], &laarr[i + 2],
1031 sizeof(struct long_ad) *
1032 (*endnum - (i + 2)));
1033 i--;
1034 (*endnum)--;
1035 }
1036 } else if ((li->extLength >> 30) ==
1037 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1038 udf_free_blocks(inode->i_sb, inode,
1039 &li->extLocation, 0,
1040 ((li->extLength &
1041 UDF_EXTENT_LENGTH_MASK) +
1042 blocksize - 1) >> blocksize_bits);
1043 li->extLocation.logicalBlockNum = 0;
1044 li->extLocation.partitionReferenceNum = 0;
1045 li->extLength = (li->extLength &
1046 UDF_EXTENT_LENGTH_MASK) |
1047 EXT_NOT_RECORDED_NOT_ALLOCATED;
1048 }
1049 }
1050 }
1051
1052 static void udf_update_extents(struct inode *inode,
1053 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1054 int startnum, int endnum,
1055 struct extent_position *epos)
1056 {
1057 int start = 0, i;
1058 struct kernel_lb_addr tmploc;
1059 uint32_t tmplen;
1060
1061 if (startnum > endnum) {
1062 for (i = 0; i < (startnum - endnum); i++)
1063 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1064 laarr[i].extLength);
1065 } else if (startnum < endnum) {
1066 for (i = 0; i < (endnum - startnum); i++) {
1067 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1068 laarr[i].extLength);
1069 udf_next_aext(inode, epos, &laarr[i].extLocation,
1070 &laarr[i].extLength, 1);
1071 start++;
1072 }
1073 }
1074
1075 for (i = start; i < endnum; i++) {
1076 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1077 udf_write_aext(inode, epos, &laarr[i].extLocation,
1078 laarr[i].extLength, 1);
1079 }
1080 }
1081
1082 struct buffer_head *udf_bread(struct inode *inode, int block,
1083 int create, int *err)
1084 {
1085 struct buffer_head *bh = NULL;
1086
1087 bh = udf_getblk(inode, block, create, err);
1088 if (!bh)
1089 return NULL;
1090
1091 if (buffer_uptodate(bh))
1092 return bh;
1093
1094 ll_rw_block(READ, 1, &bh);
1095
1096 wait_on_buffer(bh);
1097 if (buffer_uptodate(bh))
1098 return bh;
1099
1100 brelse(bh);
1101 *err = -EIO;
1102 return NULL;
1103 }
1104
1105 int udf_setsize(struct inode *inode, loff_t newsize)
1106 {
1107 int err;
1108 struct udf_inode_info *iinfo;
1109 int bsize = 1 << inode->i_blkbits;
1110
1111 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1112 S_ISLNK(inode->i_mode)))
1113 return -EINVAL;
1114 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1115 return -EPERM;
1116
1117 iinfo = UDF_I(inode);
1118 if (newsize > inode->i_size) {
1119 down_write(&iinfo->i_data_sem);
1120 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1121 if (bsize <
1122 (udf_file_entry_alloc_offset(inode) + newsize)) {
1123 err = udf_expand_file_adinicb(inode);
1124 if (err)
1125 return err;
1126 down_write(&iinfo->i_data_sem);
1127 } else {
1128 iinfo->i_lenAlloc = newsize;
1129 goto set_size;
1130 }
1131 }
1132 err = udf_extend_file(inode, newsize);
1133 if (err) {
1134 up_write(&iinfo->i_data_sem);
1135 return err;
1136 }
1137 set_size:
1138 truncate_setsize(inode, newsize);
1139 up_write(&iinfo->i_data_sem);
1140 } else {
1141 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1142 down_write(&iinfo->i_data_sem);
1143 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1144 0x00, bsize - newsize -
1145 udf_file_entry_alloc_offset(inode));
1146 iinfo->i_lenAlloc = newsize;
1147 truncate_setsize(inode, newsize);
1148 up_write(&iinfo->i_data_sem);
1149 goto update_time;
1150 }
1151 err = block_truncate_page(inode->i_mapping, newsize,
1152 udf_get_block);
1153 if (err)
1154 return err;
1155 down_write(&iinfo->i_data_sem);
1156 truncate_setsize(inode, newsize);
1157 udf_truncate_extents(inode);
1158 up_write(&iinfo->i_data_sem);
1159 }
1160 update_time:
1161 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1162 if (IS_SYNC(inode))
1163 udf_sync_inode(inode);
1164 else
1165 mark_inode_dirty(inode);
1166 return 0;
1167 }
1168
1169 static void __udf_read_inode(struct inode *inode)
1170 {
1171 struct buffer_head *bh = NULL;
1172 struct fileEntry *fe;
1173 uint16_t ident;
1174 struct udf_inode_info *iinfo = UDF_I(inode);
1175
1176 /*
1177 * Set defaults, but the inode is still incomplete!
1178 * Note: get_new_inode() sets the following on a new inode:
1179 * i_sb = sb
1180 * i_no = ino
1181 * i_flags = sb->s_flags
1182 * i_state = 0
1183 * clean_inode(): zero fills and sets
1184 * i_count = 1
1185 * i_nlink = 1
1186 * i_op = NULL;
1187 */
1188 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1189 if (!bh) {
1190 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1191 make_bad_inode(inode);
1192 return;
1193 }
1194
1195 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1196 ident != TAG_IDENT_USE) {
1197 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1198 inode->i_ino, ident);
1199 brelse(bh);
1200 make_bad_inode(inode);
1201 return;
1202 }
1203
1204 fe = (struct fileEntry *)bh->b_data;
1205
1206 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1207 struct buffer_head *ibh;
1208
1209 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1210 &ident);
1211 if (ident == TAG_IDENT_IE && ibh) {
1212 struct buffer_head *nbh = NULL;
1213 struct kernel_lb_addr loc;
1214 struct indirectEntry *ie;
1215
1216 ie = (struct indirectEntry *)ibh->b_data;
1217 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1218
1219 if (ie->indirectICB.extLength &&
1220 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1221 &ident))) {
1222 if (ident == TAG_IDENT_FE ||
1223 ident == TAG_IDENT_EFE) {
1224 memcpy(&iinfo->i_location,
1225 &loc,
1226 sizeof(struct kernel_lb_addr));
1227 brelse(bh);
1228 brelse(ibh);
1229 brelse(nbh);
1230 __udf_read_inode(inode);
1231 return;
1232 }
1233 brelse(nbh);
1234 }
1235 }
1236 brelse(ibh);
1237 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1238 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1239 le16_to_cpu(fe->icbTag.strategyType));
1240 brelse(bh);
1241 make_bad_inode(inode);
1242 return;
1243 }
1244 udf_fill_inode(inode, bh);
1245
1246 brelse(bh);
1247 }
1248
1249 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1250 {
1251 struct fileEntry *fe;
1252 struct extendedFileEntry *efe;
1253 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1254 struct udf_inode_info *iinfo = UDF_I(inode);
1255 unsigned int link_count;
1256
1257 fe = (struct fileEntry *)bh->b_data;
1258 efe = (struct extendedFileEntry *)bh->b_data;
1259
1260 if (fe->icbTag.strategyType == cpu_to_le16(4))
1261 iinfo->i_strat4096 = 0;
1262 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1263 iinfo->i_strat4096 = 1;
1264
1265 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1266 ICBTAG_FLAG_AD_MASK;
1267 iinfo->i_unique = 0;
1268 iinfo->i_lenEAttr = 0;
1269 iinfo->i_lenExtents = 0;
1270 iinfo->i_lenAlloc = 0;
1271 iinfo->i_next_alloc_block = 0;
1272 iinfo->i_next_alloc_goal = 0;
1273 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1274 iinfo->i_efe = 1;
1275 iinfo->i_use = 0;
1276 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1277 sizeof(struct extendedFileEntry))) {
1278 make_bad_inode(inode);
1279 return;
1280 }
1281 memcpy(iinfo->i_ext.i_data,
1282 bh->b_data + sizeof(struct extendedFileEntry),
1283 inode->i_sb->s_blocksize -
1284 sizeof(struct extendedFileEntry));
1285 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1286 iinfo->i_efe = 0;
1287 iinfo->i_use = 0;
1288 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1289 sizeof(struct fileEntry))) {
1290 make_bad_inode(inode);
1291 return;
1292 }
1293 memcpy(iinfo->i_ext.i_data,
1294 bh->b_data + sizeof(struct fileEntry),
1295 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1296 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1297 iinfo->i_efe = 0;
1298 iinfo->i_use = 1;
1299 iinfo->i_lenAlloc = le32_to_cpu(
1300 ((struct unallocSpaceEntry *)bh->b_data)->
1301 lengthAllocDescs);
1302 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1303 sizeof(struct unallocSpaceEntry))) {
1304 make_bad_inode(inode);
1305 return;
1306 }
1307 memcpy(iinfo->i_ext.i_data,
1308 bh->b_data + sizeof(struct unallocSpaceEntry),
1309 inode->i_sb->s_blocksize -
1310 sizeof(struct unallocSpaceEntry));
1311 return;
1312 }
1313
1314 read_lock(&sbi->s_cred_lock);
1315 inode->i_uid = le32_to_cpu(fe->uid);
1316 if (inode->i_uid == -1 ||
1317 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1318 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1319 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1320
1321 inode->i_gid = le32_to_cpu(fe->gid);
1322 if (inode->i_gid == -1 ||
1323 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1324 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1325 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1326
1327 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1328 sbi->s_fmode != UDF_INVALID_MODE)
1329 inode->i_mode = sbi->s_fmode;
1330 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1331 sbi->s_dmode != UDF_INVALID_MODE)
1332 inode->i_mode = sbi->s_dmode;
1333 else
1334 inode->i_mode = udf_convert_permissions(fe);
1335 inode->i_mode &= ~sbi->s_umask;
1336 read_unlock(&sbi->s_cred_lock);
1337
1338 link_count = le16_to_cpu(fe->fileLinkCount);
1339 if (!link_count)
1340 link_count = 1;
1341 set_nlink(inode, link_count);
1342
1343 inode->i_size = le64_to_cpu(fe->informationLength);
1344 iinfo->i_lenExtents = inode->i_size;
1345
1346 if (iinfo->i_efe == 0) {
1347 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1348 (inode->i_sb->s_blocksize_bits - 9);
1349
1350 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1351 inode->i_atime = sbi->s_record_time;
1352
1353 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1354 fe->modificationTime))
1355 inode->i_mtime = sbi->s_record_time;
1356
1357 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1358 inode->i_ctime = sbi->s_record_time;
1359
1360 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1361 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1362 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1363 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1364 } else {
1365 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1366 (inode->i_sb->s_blocksize_bits - 9);
1367
1368 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1369 inode->i_atime = sbi->s_record_time;
1370
1371 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1372 efe->modificationTime))
1373 inode->i_mtime = sbi->s_record_time;
1374
1375 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1376 iinfo->i_crtime = sbi->s_record_time;
1377
1378 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1379 inode->i_ctime = sbi->s_record_time;
1380
1381 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1382 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1383 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1384 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1385 }
1386
1387 switch (fe->icbTag.fileType) {
1388 case ICBTAG_FILE_TYPE_DIRECTORY:
1389 inode->i_op = &udf_dir_inode_operations;
1390 inode->i_fop = &udf_dir_operations;
1391 inode->i_mode |= S_IFDIR;
1392 inc_nlink(inode);
1393 break;
1394 case ICBTAG_FILE_TYPE_REALTIME:
1395 case ICBTAG_FILE_TYPE_REGULAR:
1396 case ICBTAG_FILE_TYPE_UNDEF:
1397 case ICBTAG_FILE_TYPE_VAT20:
1398 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1399 inode->i_data.a_ops = &udf_adinicb_aops;
1400 else
1401 inode->i_data.a_ops = &udf_aops;
1402 inode->i_op = &udf_file_inode_operations;
1403 inode->i_fop = &udf_file_operations;
1404 inode->i_mode |= S_IFREG;
1405 break;
1406 case ICBTAG_FILE_TYPE_BLOCK:
1407 inode->i_mode |= S_IFBLK;
1408 break;
1409 case ICBTAG_FILE_TYPE_CHAR:
1410 inode->i_mode |= S_IFCHR;
1411 break;
1412 case ICBTAG_FILE_TYPE_FIFO:
1413 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1414 break;
1415 case ICBTAG_FILE_TYPE_SOCKET:
1416 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1417 break;
1418 case ICBTAG_FILE_TYPE_SYMLINK:
1419 inode->i_data.a_ops = &udf_symlink_aops;
1420 inode->i_op = &udf_symlink_inode_operations;
1421 inode->i_mode = S_IFLNK | S_IRWXUGO;
1422 break;
1423 case ICBTAG_FILE_TYPE_MAIN:
1424 udf_debug("METADATA FILE-----\n");
1425 break;
1426 case ICBTAG_FILE_TYPE_MIRROR:
1427 udf_debug("METADATA MIRROR FILE-----\n");
1428 break;
1429 case ICBTAG_FILE_TYPE_BITMAP:
1430 udf_debug("METADATA BITMAP FILE-----\n");
1431 break;
1432 default:
1433 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1434 inode->i_ino, fe->icbTag.fileType);
1435 make_bad_inode(inode);
1436 return;
1437 }
1438 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1439 struct deviceSpec *dsea =
1440 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1441 if (dsea) {
1442 init_special_inode(inode, inode->i_mode,
1443 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1444 le32_to_cpu(dsea->minorDeviceIdent)));
1445 /* Developer ID ??? */
1446 } else
1447 make_bad_inode(inode);
1448 }
1449 }
1450
1451 static int udf_alloc_i_data(struct inode *inode, size_t size)
1452 {
1453 struct udf_inode_info *iinfo = UDF_I(inode);
1454 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1455
1456 if (!iinfo->i_ext.i_data) {
1457 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1458 inode->i_ino);
1459 return -ENOMEM;
1460 }
1461
1462 return 0;
1463 }
1464
1465 static umode_t udf_convert_permissions(struct fileEntry *fe)
1466 {
1467 umode_t mode;
1468 uint32_t permissions;
1469 uint32_t flags;
1470
1471 permissions = le32_to_cpu(fe->permissions);
1472 flags = le16_to_cpu(fe->icbTag.flags);
1473
1474 mode = ((permissions) & S_IRWXO) |
1475 ((permissions >> 2) & S_IRWXG) |
1476 ((permissions >> 4) & S_IRWXU) |
1477 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1478 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1479 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1480
1481 return mode;
1482 }
1483
1484 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1485 {
1486 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1487 }
1488
1489 static int udf_sync_inode(struct inode *inode)
1490 {
1491 return udf_update_inode(inode, 1);
1492 }
1493
1494 static int udf_update_inode(struct inode *inode, int do_sync)
1495 {
1496 struct buffer_head *bh = NULL;
1497 struct fileEntry *fe;
1498 struct extendedFileEntry *efe;
1499 uint64_t lb_recorded;
1500 uint32_t udfperms;
1501 uint16_t icbflags;
1502 uint16_t crclen;
1503 int err = 0;
1504 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1505 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1506 struct udf_inode_info *iinfo = UDF_I(inode);
1507
1508 bh = udf_tgetblk(inode->i_sb,
1509 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1510 if (!bh) {
1511 udf_debug("getblk failure\n");
1512 return -ENOMEM;
1513 }
1514
1515 lock_buffer(bh);
1516 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1517 fe = (struct fileEntry *)bh->b_data;
1518 efe = (struct extendedFileEntry *)bh->b_data;
1519
1520 if (iinfo->i_use) {
1521 struct unallocSpaceEntry *use =
1522 (struct unallocSpaceEntry *)bh->b_data;
1523
1524 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1525 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1526 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1527 sizeof(struct unallocSpaceEntry));
1528 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1529 use->descTag.tagLocation =
1530 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1531 crclen = sizeof(struct unallocSpaceEntry) +
1532 iinfo->i_lenAlloc - sizeof(struct tag);
1533 use->descTag.descCRCLength = cpu_to_le16(crclen);
1534 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1535 sizeof(struct tag),
1536 crclen));
1537 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1538
1539 goto out;
1540 }
1541
1542 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1543 fe->uid = cpu_to_le32(-1);
1544 else
1545 fe->uid = cpu_to_le32(inode->i_uid);
1546
1547 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1548 fe->gid = cpu_to_le32(-1);
1549 else
1550 fe->gid = cpu_to_le32(inode->i_gid);
1551
1552 udfperms = ((inode->i_mode & S_IRWXO)) |
1553 ((inode->i_mode & S_IRWXG) << 2) |
1554 ((inode->i_mode & S_IRWXU) << 4);
1555
1556 udfperms |= (le32_to_cpu(fe->permissions) &
1557 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1558 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1559 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1560 fe->permissions = cpu_to_le32(udfperms);
1561
1562 if (S_ISDIR(inode->i_mode))
1563 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1564 else
1565 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1566
1567 fe->informationLength = cpu_to_le64(inode->i_size);
1568
1569 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1570 struct regid *eid;
1571 struct deviceSpec *dsea =
1572 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1573 if (!dsea) {
1574 dsea = (struct deviceSpec *)
1575 udf_add_extendedattr(inode,
1576 sizeof(struct deviceSpec) +
1577 sizeof(struct regid), 12, 0x3);
1578 dsea->attrType = cpu_to_le32(12);
1579 dsea->attrSubtype = 1;
1580 dsea->attrLength = cpu_to_le32(
1581 sizeof(struct deviceSpec) +
1582 sizeof(struct regid));
1583 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1584 }
1585 eid = (struct regid *)dsea->impUse;
1586 memset(eid, 0, sizeof(struct regid));
1587 strcpy(eid->ident, UDF_ID_DEVELOPER);
1588 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1589 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1590 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1591 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1592 }
1593
1594 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1595 lb_recorded = 0; /* No extents => no blocks! */
1596 else
1597 lb_recorded =
1598 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1599 (blocksize_bits - 9);
1600
1601 if (iinfo->i_efe == 0) {
1602 memcpy(bh->b_data + sizeof(struct fileEntry),
1603 iinfo->i_ext.i_data,
1604 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1605 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1606
1607 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1608 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1609 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1610 memset(&(fe->impIdent), 0, sizeof(struct regid));
1611 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1612 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1613 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1614 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1615 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1616 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1617 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1618 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1619 crclen = sizeof(struct fileEntry);
1620 } else {
1621 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1622 iinfo->i_ext.i_data,
1623 inode->i_sb->s_blocksize -
1624 sizeof(struct extendedFileEntry));
1625 efe->objectSize = cpu_to_le64(inode->i_size);
1626 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1627
1628 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1629 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1630 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1631 iinfo->i_crtime = inode->i_atime;
1632
1633 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1634 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1635 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1636 iinfo->i_crtime = inode->i_mtime;
1637
1638 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1639 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1640 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1641 iinfo->i_crtime = inode->i_ctime;
1642
1643 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1644 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1645 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1646 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1647
1648 memset(&(efe->impIdent), 0, sizeof(struct regid));
1649 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1650 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1651 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1652 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1653 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1654 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1655 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1656 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1657 crclen = sizeof(struct extendedFileEntry);
1658 }
1659 if (iinfo->i_strat4096) {
1660 fe->icbTag.strategyType = cpu_to_le16(4096);
1661 fe->icbTag.strategyParameter = cpu_to_le16(1);
1662 fe->icbTag.numEntries = cpu_to_le16(2);
1663 } else {
1664 fe->icbTag.strategyType = cpu_to_le16(4);
1665 fe->icbTag.numEntries = cpu_to_le16(1);
1666 }
1667
1668 if (S_ISDIR(inode->i_mode))
1669 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1670 else if (S_ISREG(inode->i_mode))
1671 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1672 else if (S_ISLNK(inode->i_mode))
1673 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1674 else if (S_ISBLK(inode->i_mode))
1675 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1676 else if (S_ISCHR(inode->i_mode))
1677 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1678 else if (S_ISFIFO(inode->i_mode))
1679 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1680 else if (S_ISSOCK(inode->i_mode))
1681 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1682
1683 icbflags = iinfo->i_alloc_type |
1684 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1685 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1686 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1687 (le16_to_cpu(fe->icbTag.flags) &
1688 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1689 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1690
1691 fe->icbTag.flags = cpu_to_le16(icbflags);
1692 if (sbi->s_udfrev >= 0x0200)
1693 fe->descTag.descVersion = cpu_to_le16(3);
1694 else
1695 fe->descTag.descVersion = cpu_to_le16(2);
1696 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1697 fe->descTag.tagLocation = cpu_to_le32(
1698 iinfo->i_location.logicalBlockNum);
1699 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1700 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1701 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1702 crclen));
1703 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1704
1705 out:
1706 set_buffer_uptodate(bh);
1707 unlock_buffer(bh);
1708
1709 /* write the data blocks */
1710 mark_buffer_dirty(bh);
1711 if (do_sync) {
1712 sync_dirty_buffer(bh);
1713 if (buffer_write_io_error(bh)) {
1714 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1715 inode->i_ino);
1716 err = -EIO;
1717 }
1718 }
1719 brelse(bh);
1720
1721 return err;
1722 }
1723
1724 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1725 {
1726 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1727 struct inode *inode = iget_locked(sb, block);
1728
1729 if (!inode)
1730 return NULL;
1731
1732 if (inode->i_state & I_NEW) {
1733 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1734 __udf_read_inode(inode);
1735 unlock_new_inode(inode);
1736 }
1737
1738 if (is_bad_inode(inode))
1739 goto out_iput;
1740
1741 if (ino->logicalBlockNum >= UDF_SB(sb)->
1742 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1743 udf_debug("block=%d, partition=%d out of range\n",
1744 ino->logicalBlockNum, ino->partitionReferenceNum);
1745 make_bad_inode(inode);
1746 goto out_iput;
1747 }
1748
1749 return inode;
1750
1751 out_iput:
1752 iput(inode);
1753 return NULL;
1754 }
1755
1756 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1757 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1758 {
1759 int adsize;
1760 struct short_ad *sad = NULL;
1761 struct long_ad *lad = NULL;
1762 struct allocExtDesc *aed;
1763 uint8_t *ptr;
1764 struct udf_inode_info *iinfo = UDF_I(inode);
1765
1766 if (!epos->bh)
1767 ptr = iinfo->i_ext.i_data + epos->offset -
1768 udf_file_entry_alloc_offset(inode) +
1769 iinfo->i_lenEAttr;
1770 else
1771 ptr = epos->bh->b_data + epos->offset;
1772
1773 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1774 adsize = sizeof(struct short_ad);
1775 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1776 adsize = sizeof(struct long_ad);
1777 else
1778 return -EIO;
1779
1780 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1781 unsigned char *sptr, *dptr;
1782 struct buffer_head *nbh;
1783 int err, loffset;
1784 struct kernel_lb_addr obloc = epos->block;
1785
1786 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1787 obloc.partitionReferenceNum,
1788 obloc.logicalBlockNum, &err);
1789 if (!epos->block.logicalBlockNum)
1790 return -ENOSPC;
1791 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1792 &epos->block,
1793 0));
1794 if (!nbh)
1795 return -EIO;
1796 lock_buffer(nbh);
1797 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1798 set_buffer_uptodate(nbh);
1799 unlock_buffer(nbh);
1800 mark_buffer_dirty_inode(nbh, inode);
1801
1802 aed = (struct allocExtDesc *)(nbh->b_data);
1803 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1804 aed->previousAllocExtLocation =
1805 cpu_to_le32(obloc.logicalBlockNum);
1806 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1807 loffset = epos->offset;
1808 aed->lengthAllocDescs = cpu_to_le32(adsize);
1809 sptr = ptr - adsize;
1810 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1811 memcpy(dptr, sptr, adsize);
1812 epos->offset = sizeof(struct allocExtDesc) + adsize;
1813 } else {
1814 loffset = epos->offset + adsize;
1815 aed->lengthAllocDescs = cpu_to_le32(0);
1816 sptr = ptr;
1817 epos->offset = sizeof(struct allocExtDesc);
1818
1819 if (epos->bh) {
1820 aed = (struct allocExtDesc *)epos->bh->b_data;
1821 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1822 } else {
1823 iinfo->i_lenAlloc += adsize;
1824 mark_inode_dirty(inode);
1825 }
1826 }
1827 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1828 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1829 epos->block.logicalBlockNum, sizeof(struct tag));
1830 else
1831 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1832 epos->block.logicalBlockNum, sizeof(struct tag));
1833 switch (iinfo->i_alloc_type) {
1834 case ICBTAG_FLAG_AD_SHORT:
1835 sad = (struct short_ad *)sptr;
1836 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1837 inode->i_sb->s_blocksize);
1838 sad->extPosition =
1839 cpu_to_le32(epos->block.logicalBlockNum);
1840 break;
1841 case ICBTAG_FLAG_AD_LONG:
1842 lad = (struct long_ad *)sptr;
1843 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1844 inode->i_sb->s_blocksize);
1845 lad->extLocation = cpu_to_lelb(epos->block);
1846 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1847 break;
1848 }
1849 if (epos->bh) {
1850 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1851 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1852 udf_update_tag(epos->bh->b_data, loffset);
1853 else
1854 udf_update_tag(epos->bh->b_data,
1855 sizeof(struct allocExtDesc));
1856 mark_buffer_dirty_inode(epos->bh, inode);
1857 brelse(epos->bh);
1858 } else {
1859 mark_inode_dirty(inode);
1860 }
1861 epos->bh = nbh;
1862 }
1863
1864 udf_write_aext(inode, epos, eloc, elen, inc);
1865
1866 if (!epos->bh) {
1867 iinfo->i_lenAlloc += adsize;
1868 mark_inode_dirty(inode);
1869 } else {
1870 aed = (struct allocExtDesc *)epos->bh->b_data;
1871 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1872 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1873 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1874 udf_update_tag(epos->bh->b_data,
1875 epos->offset + (inc ? 0 : adsize));
1876 else
1877 udf_update_tag(epos->bh->b_data,
1878 sizeof(struct allocExtDesc));
1879 mark_buffer_dirty_inode(epos->bh, inode);
1880 }
1881
1882 return 0;
1883 }
1884
1885 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1886 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1887 {
1888 int adsize;
1889 uint8_t *ptr;
1890 struct short_ad *sad;
1891 struct long_ad *lad;
1892 struct udf_inode_info *iinfo = UDF_I(inode);
1893
1894 if (!epos->bh)
1895 ptr = iinfo->i_ext.i_data + epos->offset -
1896 udf_file_entry_alloc_offset(inode) +
1897 iinfo->i_lenEAttr;
1898 else
1899 ptr = epos->bh->b_data + epos->offset;
1900
1901 switch (iinfo->i_alloc_type) {
1902 case ICBTAG_FLAG_AD_SHORT:
1903 sad = (struct short_ad *)ptr;
1904 sad->extLength = cpu_to_le32(elen);
1905 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1906 adsize = sizeof(struct short_ad);
1907 break;
1908 case ICBTAG_FLAG_AD_LONG:
1909 lad = (struct long_ad *)ptr;
1910 lad->extLength = cpu_to_le32(elen);
1911 lad->extLocation = cpu_to_lelb(*eloc);
1912 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1913 adsize = sizeof(struct long_ad);
1914 break;
1915 default:
1916 return;
1917 }
1918
1919 if (epos->bh) {
1920 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1921 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1922 struct allocExtDesc *aed =
1923 (struct allocExtDesc *)epos->bh->b_data;
1924 udf_update_tag(epos->bh->b_data,
1925 le32_to_cpu(aed->lengthAllocDescs) +
1926 sizeof(struct allocExtDesc));
1927 }
1928 mark_buffer_dirty_inode(epos->bh, inode);
1929 } else {
1930 mark_inode_dirty(inode);
1931 }
1932
1933 if (inc)
1934 epos->offset += adsize;
1935 }
1936
1937 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1938 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1939 {
1940 int8_t etype;
1941
1942 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1943 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1944 int block;
1945 epos->block = *eloc;
1946 epos->offset = sizeof(struct allocExtDesc);
1947 brelse(epos->bh);
1948 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1949 epos->bh = udf_tread(inode->i_sb, block);
1950 if (!epos->bh) {
1951 udf_debug("reading block %d failed!\n", block);
1952 return -1;
1953 }
1954 }
1955
1956 return etype;
1957 }
1958
1959 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1960 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1961 {
1962 int alen;
1963 int8_t etype;
1964 uint8_t *ptr;
1965 struct short_ad *sad;
1966 struct long_ad *lad;
1967 struct udf_inode_info *iinfo = UDF_I(inode);
1968
1969 if (!epos->bh) {
1970 if (!epos->offset)
1971 epos->offset = udf_file_entry_alloc_offset(inode);
1972 ptr = iinfo->i_ext.i_data + epos->offset -
1973 udf_file_entry_alloc_offset(inode) +
1974 iinfo->i_lenEAttr;
1975 alen = udf_file_entry_alloc_offset(inode) +
1976 iinfo->i_lenAlloc;
1977 } else {
1978 if (!epos->offset)
1979 epos->offset = sizeof(struct allocExtDesc);
1980 ptr = epos->bh->b_data + epos->offset;
1981 alen = sizeof(struct allocExtDesc) +
1982 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1983 lengthAllocDescs);
1984 }
1985
1986 switch (iinfo->i_alloc_type) {
1987 case ICBTAG_FLAG_AD_SHORT:
1988 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1989 if (!sad)
1990 return -1;
1991 etype = le32_to_cpu(sad->extLength) >> 30;
1992 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1993 eloc->partitionReferenceNum =
1994 iinfo->i_location.partitionReferenceNum;
1995 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1996 break;
1997 case ICBTAG_FLAG_AD_LONG:
1998 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1999 if (!lad)
2000 return -1;
2001 etype = le32_to_cpu(lad->extLength) >> 30;
2002 *eloc = lelb_to_cpu(lad->extLocation);
2003 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2004 break;
2005 default:
2006 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2007 return -1;
2008 }
2009
2010 return etype;
2011 }
2012
2013 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2014 struct kernel_lb_addr neloc, uint32_t nelen)
2015 {
2016 struct kernel_lb_addr oeloc;
2017 uint32_t oelen;
2018 int8_t etype;
2019
2020 if (epos.bh)
2021 get_bh(epos.bh);
2022
2023 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2024 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2025 neloc = oeloc;
2026 nelen = (etype << 30) | oelen;
2027 }
2028 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2029 brelse(epos.bh);
2030
2031 return (nelen >> 30);
2032 }
2033
2034 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2035 struct kernel_lb_addr eloc, uint32_t elen)
2036 {
2037 struct extent_position oepos;
2038 int adsize;
2039 int8_t etype;
2040 struct allocExtDesc *aed;
2041 struct udf_inode_info *iinfo;
2042
2043 if (epos.bh) {
2044 get_bh(epos.bh);
2045 get_bh(epos.bh);
2046 }
2047
2048 iinfo = UDF_I(inode);
2049 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2050 adsize = sizeof(struct short_ad);
2051 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2052 adsize = sizeof(struct long_ad);
2053 else
2054 adsize = 0;
2055
2056 oepos = epos;
2057 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2058 return -1;
2059
2060 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2061 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2062 if (oepos.bh != epos.bh) {
2063 oepos.block = epos.block;
2064 brelse(oepos.bh);
2065 get_bh(epos.bh);
2066 oepos.bh = epos.bh;
2067 oepos.offset = epos.offset - adsize;
2068 }
2069 }
2070 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2071 elen = 0;
2072
2073 if (epos.bh != oepos.bh) {
2074 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2075 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2076 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2077 if (!oepos.bh) {
2078 iinfo->i_lenAlloc -= (adsize * 2);
2079 mark_inode_dirty(inode);
2080 } else {
2081 aed = (struct allocExtDesc *)oepos.bh->b_data;
2082 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2083 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2084 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2085 udf_update_tag(oepos.bh->b_data,
2086 oepos.offset - (2 * adsize));
2087 else
2088 udf_update_tag(oepos.bh->b_data,
2089 sizeof(struct allocExtDesc));
2090 mark_buffer_dirty_inode(oepos.bh, inode);
2091 }
2092 } else {
2093 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2094 if (!oepos.bh) {
2095 iinfo->i_lenAlloc -= adsize;
2096 mark_inode_dirty(inode);
2097 } else {
2098 aed = (struct allocExtDesc *)oepos.bh->b_data;
2099 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2100 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2101 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2102 udf_update_tag(oepos.bh->b_data,
2103 epos.offset - adsize);
2104 else
2105 udf_update_tag(oepos.bh->b_data,
2106 sizeof(struct allocExtDesc));
2107 mark_buffer_dirty_inode(oepos.bh, inode);
2108 }
2109 }
2110
2111 brelse(epos.bh);
2112 brelse(oepos.bh);
2113
2114 return (elen >> 30);
2115 }
2116
2117 int8_t inode_bmap(struct inode *inode, sector_t block,
2118 struct extent_position *pos, struct kernel_lb_addr *eloc,
2119 uint32_t *elen, sector_t *offset)
2120 {
2121 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2122 loff_t lbcount = 0, bcount =
2123 (loff_t) block << blocksize_bits;
2124 int8_t etype;
2125 struct udf_inode_info *iinfo;
2126
2127 iinfo = UDF_I(inode);
2128 pos->offset = 0;
2129 pos->block = iinfo->i_location;
2130 pos->bh = NULL;
2131 *elen = 0;
2132
2133 do {
2134 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2135 if (etype == -1) {
2136 *offset = (bcount - lbcount) >> blocksize_bits;
2137 iinfo->i_lenExtents = lbcount;
2138 return -1;
2139 }
2140 lbcount += *elen;
2141 } while (lbcount <= bcount);
2142
2143 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2144
2145 return etype;
2146 }
2147
2148 long udf_block_map(struct inode *inode, sector_t block)
2149 {
2150 struct kernel_lb_addr eloc;
2151 uint32_t elen;
2152 sector_t offset;
2153 struct extent_position epos = {};
2154 int ret;
2155
2156 down_read(&UDF_I(inode)->i_data_sem);
2157
2158 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2159 (EXT_RECORDED_ALLOCATED >> 30))
2160 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2161 else
2162 ret = 0;
2163
2164 up_read(&UDF_I(inode)->i_data_sem);
2165 brelse(epos.bh);
2166
2167 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2168 return udf_fixed_to_variable(ret);
2169 else
2170 return ret;
2171 }
Linux kernel - Deliverables
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