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udf: Convert UDF to new truncate calling sequence
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / inode.c
blobccc81432141411aadb24aa10b076d82e376ae5c4
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
41 #include "udf_i.h"
42 #include "udf_sb.h"
43
44 MODULE_AUTHOR("Ben Fennema");
45 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
46 MODULE_LICENSE("GPL");
47
48 #define EXTENT_MERGE_SIZE 5
49
50 static mode_t udf_convert_permissions(struct fileEntry *);
51 static int udf_update_inode(struct inode *, int);
52 static void udf_fill_inode(struct inode *, struct buffer_head *);
53 static int udf_sync_inode(struct inode *inode);
54 static int udf_alloc_i_data(struct inode *inode, size_t size);
55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
56 sector_t *, 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 end_writeback(inode);
84 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
85 inode->i_size != iinfo->i_lenExtents) {
86 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
87 "inode size %llu different from extent length %llu. "
88 "Filesystem need not be standards compliant.\n",
89 inode->i_sb->s_id, inode->i_ino, inode->i_mode,
90 (unsigned long long)inode->i_size,
91 (unsigned long long)iinfo->i_lenExtents);
92 }
93 kfree(iinfo->i_ext.i_data);
94 iinfo->i_ext.i_data = NULL;
95 if (want_delete) {
96 udf_free_inode(inode);
97 }
98 }
99
100 static int udf_writepage(struct page *page, struct writeback_control *wbc)
101 {
102 return block_write_full_page(page, udf_get_block, wbc);
103 }
104
105 static int udf_readpage(struct file *file, struct page *page)
106 {
107 return block_read_full_page(page, udf_get_block);
108 }
109
110 static int udf_write_begin(struct file *file, struct address_space *mapping,
111 loff_t pos, unsigned len, unsigned flags,
112 struct page **pagep, void **fsdata)
113 {
114 int ret;
115
116 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
117 if (unlikely(ret)) {
118 struct inode *inode = mapping->host;
119 struct udf_inode_info *iinfo = UDF_I(inode);
120 loff_t isize = inode->i_size;
121
122 if (pos + len > isize) {
123 truncate_pagecache(inode, pos + len, isize);
124 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
125 down_write(&iinfo->i_data_sem);
126 udf_truncate_extents(inode);
127 up_write(&iinfo->i_data_sem);
128 }
129 }
130 }
131
132 return ret;
133 }
134
135 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
136 {
137 return generic_block_bmap(mapping, block, udf_get_block);
138 }
139
140 const struct address_space_operations udf_aops = {
141 .readpage = udf_readpage,
142 .writepage = udf_writepage,
143 .sync_page = block_sync_page,
144 .write_begin = udf_write_begin,
145 .write_end = generic_write_end,
146 .bmap = udf_bmap,
147 };
148
149 int udf_expand_file_adinicb(struct inode *inode)
150 {
151 struct page *page;
152 char *kaddr;
153 struct udf_inode_info *iinfo = UDF_I(inode);
154 int err;
155 struct writeback_control udf_wbc = {
156 .sync_mode = WB_SYNC_NONE,
157 .nr_to_write = 1,
158 };
159
160 if (!iinfo->i_lenAlloc) {
161 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
162 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
163 else
164 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
165 /* from now on we have normal address_space methods */
166 inode->i_data.a_ops = &udf_aops;
167 mark_inode_dirty(inode);
168 return 0;
169 }
170
171 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
172 if (!page)
173 return -ENOMEM;
174
175 if (!PageUptodate(page)) {
176 kaddr = kmap(page);
177 memset(kaddr + iinfo->i_lenAlloc, 0x00,
178 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
179 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
180 iinfo->i_lenAlloc);
181 flush_dcache_page(page);
182 SetPageUptodate(page);
183 kunmap(page);
184 }
185 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
186 iinfo->i_lenAlloc);
187 iinfo->i_lenAlloc = 0;
188 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
189 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
190 else
191 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
192 /* from now on we have normal address_space methods */
193 inode->i_data.a_ops = &udf_aops;
194 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
195 if (err) {
196 /* Restore everything back so that we don't lose data... */
197 lock_page(page);
198 kaddr = kmap(page);
199 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
200 inode->i_size);
201 kunmap(page);
202 unlock_page(page);
203 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
204 inode->i_data.a_ops = &udf_adinicb_aops;
205 }
206 page_cache_release(page);
207 mark_inode_dirty(inode);
208
209 return err;
210 }
211
212 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
213 int *err)
214 {
215 int newblock;
216 struct buffer_head *dbh = NULL;
217 struct kernel_lb_addr eloc;
218 uint8_t alloctype;
219 struct extent_position epos;
220
221 struct udf_fileident_bh sfibh, dfibh;
222 loff_t f_pos = udf_ext0_offset(inode);
223 int size = udf_ext0_offset(inode) + inode->i_size;
224 struct fileIdentDesc cfi, *sfi, *dfi;
225 struct udf_inode_info *iinfo = UDF_I(inode);
226
227 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
228 alloctype = ICBTAG_FLAG_AD_SHORT;
229 else
230 alloctype = ICBTAG_FLAG_AD_LONG;
231
232 if (!inode->i_size) {
233 iinfo->i_alloc_type = alloctype;
234 mark_inode_dirty(inode);
235 return NULL;
236 }
237
238 /* alloc block, and copy data to it */
239 *block = udf_new_block(inode->i_sb, inode,
240 iinfo->i_location.partitionReferenceNum,
241 iinfo->i_location.logicalBlockNum, err);
242 if (!(*block))
243 return NULL;
244 newblock = udf_get_pblock(inode->i_sb, *block,
245 iinfo->i_location.partitionReferenceNum,
246 0);
247 if (!newblock)
248 return NULL;
249 dbh = udf_tgetblk(inode->i_sb, newblock);
250 if (!dbh)
251 return NULL;
252 lock_buffer(dbh);
253 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
254 set_buffer_uptodate(dbh);
255 unlock_buffer(dbh);
256 mark_buffer_dirty_inode(dbh, inode);
257
258 sfibh.soffset = sfibh.eoffset =
259 f_pos & (inode->i_sb->s_blocksize - 1);
260 sfibh.sbh = sfibh.ebh = NULL;
261 dfibh.soffset = dfibh.eoffset = 0;
262 dfibh.sbh = dfibh.ebh = dbh;
263 while (f_pos < size) {
264 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
265 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
266 NULL, NULL, NULL);
267 if (!sfi) {
268 brelse(dbh);
269 return NULL;
270 }
271 iinfo->i_alloc_type = alloctype;
272 sfi->descTag.tagLocation = cpu_to_le32(*block);
273 dfibh.soffset = dfibh.eoffset;
274 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
275 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
276 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
277 sfi->fileIdent +
278 le16_to_cpu(sfi->lengthOfImpUse))) {
279 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
280 brelse(dbh);
281 return NULL;
282 }
283 }
284 mark_buffer_dirty_inode(dbh, inode);
285
286 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
287 iinfo->i_lenAlloc);
288 iinfo->i_lenAlloc = 0;
289 eloc.logicalBlockNum = *block;
290 eloc.partitionReferenceNum =
291 iinfo->i_location.partitionReferenceNum;
292 iinfo->i_lenExtents = inode->i_size;
293 epos.bh = NULL;
294 epos.block = iinfo->i_location;
295 epos.offset = udf_file_entry_alloc_offset(inode);
296 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
297 /* UniqueID stuff */
298
299 brelse(epos.bh);
300 mark_inode_dirty(inode);
301 return dbh;
302 }
303
304 static int udf_get_block(struct inode *inode, sector_t block,
305 struct buffer_head *bh_result, int create)
306 {
307 int err, new;
308 struct buffer_head *bh;
309 sector_t phys = 0;
310 struct udf_inode_info *iinfo;
311
312 if (!create) {
313 phys = udf_block_map(inode, block);
314 if (phys)
315 map_bh(bh_result, inode->i_sb, phys);
316 return 0;
317 }
318
319 err = -EIO;
320 new = 0;
321 bh = NULL;
322 iinfo = UDF_I(inode);
323
324 down_write(&iinfo->i_data_sem);
325 if (block == iinfo->i_next_alloc_block + 1) {
326 iinfo->i_next_alloc_block++;
327 iinfo->i_next_alloc_goal++;
328 }
329
330 err = 0;
331
332 bh = inode_getblk(inode, block, &err, &phys, &new);
333 BUG_ON(bh);
334 if (err)
335 goto abort;
336 BUG_ON(!phys);
337
338 if (new)
339 set_buffer_new(bh_result);
340 map_bh(bh_result, inode->i_sb, phys);
341
342 abort:
343 up_write(&iinfo->i_data_sem);
344 return err;
345 }
346
347 static struct buffer_head *udf_getblk(struct inode *inode, long block,
348 int create, int *err)
349 {
350 struct buffer_head *bh;
351 struct buffer_head dummy;
352
353 dummy.b_state = 0;
354 dummy.b_blocknr = -1000;
355 *err = udf_get_block(inode, block, &dummy, create);
356 if (!*err && buffer_mapped(&dummy)) {
357 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
358 if (buffer_new(&dummy)) {
359 lock_buffer(bh);
360 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
361 set_buffer_uptodate(bh);
362 unlock_buffer(bh);
363 mark_buffer_dirty_inode(bh, inode);
364 }
365 return bh;
366 }
367
368 return NULL;
369 }
370
371 /* Extend the file by 'blocks' blocks, return the number of extents added */
372 static int udf_do_extend_file(struct inode *inode,
373 struct extent_position *last_pos,
374 struct kernel_long_ad *last_ext,
375 sector_t blocks)
376 {
377 sector_t add;
378 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
379 struct super_block *sb = inode->i_sb;
380 struct kernel_lb_addr prealloc_loc = {};
381 int prealloc_len = 0;
382 struct udf_inode_info *iinfo;
383 int err;
384
385 /* The previous extent is fake and we should not extend by anything
386 * - there's nothing to do... */
387 if (!blocks && fake)
388 return 0;
389
390 iinfo = UDF_I(inode);
391 /* Round the last extent up to a multiple of block size */
392 if (last_ext->extLength & (sb->s_blocksize - 1)) {
393 last_ext->extLength =
394 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
395 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
396 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
397 iinfo->i_lenExtents =
398 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
399 ~(sb->s_blocksize - 1);
400 }
401
402 /* Last extent are just preallocated blocks? */
403 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
404 EXT_NOT_RECORDED_ALLOCATED) {
405 /* Save the extent so that we can reattach it to the end */
406 prealloc_loc = last_ext->extLocation;
407 prealloc_len = last_ext->extLength;
408 /* Mark the extent as a hole */
409 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
410 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
411 last_ext->extLocation.logicalBlockNum = 0;
412 last_ext->extLocation.partitionReferenceNum = 0;
413 }
414
415 /* Can we merge with the previous extent? */
416 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
417 EXT_NOT_RECORDED_NOT_ALLOCATED) {
418 add = ((1 << 30) - sb->s_blocksize -
419 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
420 sb->s_blocksize_bits;
421 if (add > blocks)
422 add = blocks;
423 blocks -= add;
424 last_ext->extLength += add << sb->s_blocksize_bits;
425 }
426
427 if (fake) {
428 udf_add_aext(inode, last_pos, &last_ext->extLocation,
429 last_ext->extLength, 1);
430 count++;
431 } else
432 udf_write_aext(inode, last_pos, &last_ext->extLocation,
433 last_ext->extLength, 1);
434
435 /* Managed to do everything necessary? */
436 if (!blocks)
437 goto out;
438
439 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
440 last_ext->extLocation.logicalBlockNum = 0;
441 last_ext->extLocation.partitionReferenceNum = 0;
442 add = (1 << (30-sb->s_blocksize_bits)) - 1;
443 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
444 (add << sb->s_blocksize_bits);
445
446 /* Create enough extents to cover the whole hole */
447 while (blocks > add) {
448 blocks -= add;
449 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
450 last_ext->extLength, 1);
451 if (err)
452 return err;
453 count++;
454 }
455 if (blocks) {
456 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
457 (blocks << sb->s_blocksize_bits);
458 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
459 last_ext->extLength, 1);
460 if (err)
461 return err;
462 count++;
463 }
464
465 out:
466 /* Do we have some preallocated blocks saved? */
467 if (prealloc_len) {
468 err = udf_add_aext(inode, last_pos, &prealloc_loc,
469 prealloc_len, 1);
470 if (err)
471 return err;
472 last_ext->extLocation = prealloc_loc;
473 last_ext->extLength = prealloc_len;
474 count++;
475 }
476
477 /* last_pos should point to the last written extent... */
478 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
479 last_pos->offset -= sizeof(struct short_ad);
480 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
481 last_pos->offset -= sizeof(struct long_ad);
482 else
483 return -EIO;
484
485 return count;
486 }
487
488 static int udf_extend_file(struct inode *inode, loff_t newsize)
489 {
490
491 struct extent_position epos;
492 struct kernel_lb_addr eloc;
493 uint32_t elen;
494 int8_t etype;
495 struct super_block *sb = inode->i_sb;
496 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
497 int adsize;
498 struct udf_inode_info *iinfo = UDF_I(inode);
499 struct kernel_long_ad extent;
500 int err;
501
502 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
503 adsize = sizeof(struct short_ad);
504 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
505 adsize = sizeof(struct long_ad);
506 else
507 BUG();
508
509 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
510
511 /* File has extent covering the new size (could happen when extending
512 * inside a block)? */
513 if (etype != -1)
514 return 0;
515 if (newsize & (sb->s_blocksize - 1))
516 offset++;
517 /* Extended file just to the boundary of the last file block? */
518 if (offset == 0)
519 return 0;
520
521 /* Truncate is extending the file by 'offset' blocks */
522 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
523 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
524 /* File has no extents at all or has empty last
525 * indirect extent! Create a fake extent... */
526 extent.extLocation.logicalBlockNum = 0;
527 extent.extLocation.partitionReferenceNum = 0;
528 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
529 } else {
530 epos.offset -= adsize;
531 etype = udf_next_aext(inode, &epos, &extent.extLocation,
532 &extent.extLength, 0);
533 extent.extLength |= etype << 30;
534 }
535 err = udf_do_extend_file(inode, &epos, &extent, offset);
536 if (err < 0)
537 goto out;
538 err = 0;
539 iinfo->i_lenExtents = newsize;
540 out:
541 brelse(epos.bh);
542 return err;
543 }
544
545 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
546 int *err, sector_t *phys, int *new)
547 {
548 static sector_t last_block;
549 struct buffer_head *result = NULL;
550 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
551 struct extent_position prev_epos, cur_epos, next_epos;
552 int count = 0, startnum = 0, endnum = 0;
553 uint32_t elen = 0, tmpelen;
554 struct kernel_lb_addr eloc, tmpeloc;
555 int c = 1;
556 loff_t lbcount = 0, b_off = 0;
557 uint32_t newblocknum, newblock;
558 sector_t offset = 0;
559 int8_t etype;
560 struct udf_inode_info *iinfo = UDF_I(inode);
561 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
562 int lastblock = 0;
563
564 prev_epos.offset = udf_file_entry_alloc_offset(inode);
565 prev_epos.block = iinfo->i_location;
566 prev_epos.bh = NULL;
567 cur_epos = next_epos = prev_epos;
568 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
569
570 /* find the extent which contains the block we are looking for.
571 alternate between laarr[0] and laarr[1] for locations of the
572 current extent, and the previous extent */
573 do {
574 if (prev_epos.bh != cur_epos.bh) {
575 brelse(prev_epos.bh);
576 get_bh(cur_epos.bh);
577 prev_epos.bh = cur_epos.bh;
578 }
579 if (cur_epos.bh != next_epos.bh) {
580 brelse(cur_epos.bh);
581 get_bh(next_epos.bh);
582 cur_epos.bh = next_epos.bh;
583 }
584
585 lbcount += elen;
586
587 prev_epos.block = cur_epos.block;
588 cur_epos.block = next_epos.block;
589
590 prev_epos.offset = cur_epos.offset;
591 cur_epos.offset = next_epos.offset;
592
593 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
594 if (etype == -1)
595 break;
596
597 c = !c;
598
599 laarr[c].extLength = (etype << 30) | elen;
600 laarr[c].extLocation = eloc;
601
602 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
603 pgoal = eloc.logicalBlockNum +
604 ((elen + inode->i_sb->s_blocksize - 1) >>
605 inode->i_sb->s_blocksize_bits);
606
607 count++;
608 } while (lbcount + elen <= b_off);
609
610 b_off -= lbcount;
611 offset = b_off >> inode->i_sb->s_blocksize_bits;
612 /*
613 * Move prev_epos and cur_epos into indirect extent if we are at
614 * the pointer to it
615 */
616 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
617 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
618
619 /* if the extent is allocated and recorded, return the block
620 if the extent is not a multiple of the blocksize, round up */
621
622 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
623 if (elen & (inode->i_sb->s_blocksize - 1)) {
624 elen = EXT_RECORDED_ALLOCATED |
625 ((elen + inode->i_sb->s_blocksize - 1) &
626 ~(inode->i_sb->s_blocksize - 1));
627 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
628 }
629 brelse(prev_epos.bh);
630 brelse(cur_epos.bh);
631 brelse(next_epos.bh);
632 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
633 *phys = newblock;
634 return NULL;
635 }
636
637 last_block = block;
638 /* Are we beyond EOF? */
639 if (etype == -1) {
640 int ret;
641
642 if (count) {
643 if (c)
644 laarr[0] = laarr[1];
645 startnum = 1;
646 } else {
647 /* Create a fake extent when there's not one */
648 memset(&laarr[0].extLocation, 0x00,
649 sizeof(struct kernel_lb_addr));
650 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
651 /* Will udf_do_extend_file() create real extent from
652 a fake one? */
653 startnum = (offset > 0);
654 }
655 /* Create extents for the hole between EOF and offset */
656 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
657 if (ret < 0) {
658 brelse(prev_epos.bh);
659 brelse(cur_epos.bh);
660 brelse(next_epos.bh);
661 *err = ret;
662 return NULL;
663 }
664 c = 0;
665 offset = 0;
666 count += ret;
667 /* We are not covered by a preallocated extent? */
668 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
669 EXT_NOT_RECORDED_ALLOCATED) {
670 /* Is there any real extent? - otherwise we overwrite
671 * the fake one... */
672 if (count)
673 c = !c;
674 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
675 inode->i_sb->s_blocksize;
676 memset(&laarr[c].extLocation, 0x00,
677 sizeof(struct kernel_lb_addr));
678 count++;
679 endnum++;
680 }
681 endnum = c + 1;
682 lastblock = 1;
683 } else {
684 endnum = startnum = ((count > 2) ? 2 : count);
685
686 /* if the current extent is in position 0,
687 swap it with the previous */
688 if (!c && count != 1) {
689 laarr[2] = laarr[0];
690 laarr[0] = laarr[1];
691 laarr[1] = laarr[2];
692 c = 1;
693 }
694
695 /* if the current block is located in an extent,
696 read the next extent */
697 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
698 if (etype != -1) {
699 laarr[c + 1].extLength = (etype << 30) | elen;
700 laarr[c + 1].extLocation = eloc;
701 count++;
702 startnum++;
703 endnum++;
704 } else
705 lastblock = 1;
706 }
707
708 /* if the current extent is not recorded but allocated, get the
709 * block in the extent corresponding to the requested block */
710 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
711 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
712 else { /* otherwise, allocate a new block */
713 if (iinfo->i_next_alloc_block == block)
714 goal = iinfo->i_next_alloc_goal;
715
716 if (!goal) {
717 if (!(goal = pgoal)) /* XXX: what was intended here? */
718 goal = iinfo->i_location.logicalBlockNum + 1;
719 }
720
721 newblocknum = udf_new_block(inode->i_sb, inode,
722 iinfo->i_location.partitionReferenceNum,
723 goal, err);
724 if (!newblocknum) {
725 brelse(prev_epos.bh);
726 *err = -ENOSPC;
727 return NULL;
728 }
729 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
730 }
731
732 /* if the extent the requsted block is located in contains multiple
733 * blocks, split the extent into at most three extents. blocks prior
734 * to requested block, requested block, and blocks after requested
735 * block */
736 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
737
738 #ifdef UDF_PREALLOCATE
739 /* We preallocate blocks only for regular files. It also makes sense
740 * for directories but there's a problem when to drop the
741 * preallocation. We might use some delayed work for that but I feel
742 * it's overengineering for a filesystem like UDF. */
743 if (S_ISREG(inode->i_mode))
744 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
745 #endif
746
747 /* merge any continuous blocks in laarr */
748 udf_merge_extents(inode, laarr, &endnum);
749
750 /* write back the new extents, inserting new extents if the new number
751 * of extents is greater than the old number, and deleting extents if
752 * the new number of extents is less than the old number */
753 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
754
755 brelse(prev_epos.bh);
756
757 newblock = udf_get_pblock(inode->i_sb, newblocknum,
758 iinfo->i_location.partitionReferenceNum, 0);
759 if (!newblock)
760 return NULL;
761 *phys = newblock;
762 *err = 0;
763 *new = 1;
764 iinfo->i_next_alloc_block = block;
765 iinfo->i_next_alloc_goal = newblocknum;
766 inode->i_ctime = current_fs_time(inode->i_sb);
767
768 if (IS_SYNC(inode))
769 udf_sync_inode(inode);
770 else
771 mark_inode_dirty(inode);
772
773 return result;
774 }
775
776 static void udf_split_extents(struct inode *inode, int *c, int offset,
777 int newblocknum,
778 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
779 int *endnum)
780 {
781 unsigned long blocksize = inode->i_sb->s_blocksize;
782 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
783
784 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
785 (laarr[*c].extLength >> 30) ==
786 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
787 int curr = *c;
788 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
789 blocksize - 1) >> blocksize_bits;
790 int8_t etype = (laarr[curr].extLength >> 30);
791
792 if (blen == 1)
793 ;
794 else if (!offset || blen == offset + 1) {
795 laarr[curr + 2] = laarr[curr + 1];
796 laarr[curr + 1] = laarr[curr];
797 } else {
798 laarr[curr + 3] = laarr[curr + 1];
799 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
800 }
801
802 if (offset) {
803 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
804 udf_free_blocks(inode->i_sb, inode,
805 &laarr[curr].extLocation,
806 0, offset);
807 laarr[curr].extLength =
808 EXT_NOT_RECORDED_NOT_ALLOCATED |
809 (offset << blocksize_bits);
810 laarr[curr].extLocation.logicalBlockNum = 0;
811 laarr[curr].extLocation.
812 partitionReferenceNum = 0;
813 } else
814 laarr[curr].extLength = (etype << 30) |
815 (offset << blocksize_bits);
816 curr++;
817 (*c)++;
818 (*endnum)++;
819 }
820
821 laarr[curr].extLocation.logicalBlockNum = newblocknum;
822 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
823 laarr[curr].extLocation.partitionReferenceNum =
824 UDF_I(inode)->i_location.partitionReferenceNum;
825 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
826 blocksize;
827 curr++;
828
829 if (blen != offset + 1) {
830 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
831 laarr[curr].extLocation.logicalBlockNum +=
832 offset + 1;
833 laarr[curr].extLength = (etype << 30) |
834 ((blen - (offset + 1)) << blocksize_bits);
835 curr++;
836 (*endnum)++;
837 }
838 }
839 }
840
841 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
842 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
843 int *endnum)
844 {
845 int start, length = 0, currlength = 0, i;
846
847 if (*endnum >= (c + 1)) {
848 if (!lastblock)
849 return;
850 else
851 start = c;
852 } else {
853 if ((laarr[c + 1].extLength >> 30) ==
854 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
855 start = c + 1;
856 length = currlength =
857 (((laarr[c + 1].extLength &
858 UDF_EXTENT_LENGTH_MASK) +
859 inode->i_sb->s_blocksize - 1) >>
860 inode->i_sb->s_blocksize_bits);
861 } else
862 start = c;
863 }
864
865 for (i = start + 1; i <= *endnum; i++) {
866 if (i == *endnum) {
867 if (lastblock)
868 length += UDF_DEFAULT_PREALLOC_BLOCKS;
869 } else if ((laarr[i].extLength >> 30) ==
870 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
871 length += (((laarr[i].extLength &
872 UDF_EXTENT_LENGTH_MASK) +
873 inode->i_sb->s_blocksize - 1) >>
874 inode->i_sb->s_blocksize_bits);
875 } else
876 break;
877 }
878
879 if (length) {
880 int next = laarr[start].extLocation.logicalBlockNum +
881 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
882 inode->i_sb->s_blocksize - 1) >>
883 inode->i_sb->s_blocksize_bits);
884 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
885 laarr[start].extLocation.partitionReferenceNum,
886 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
887 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
888 currlength);
889 if (numalloc) {
890 if (start == (c + 1))
891 laarr[start].extLength +=
892 (numalloc <<
893 inode->i_sb->s_blocksize_bits);
894 else {
895 memmove(&laarr[c + 2], &laarr[c + 1],
896 sizeof(struct long_ad) * (*endnum - (c + 1)));
897 (*endnum)++;
898 laarr[c + 1].extLocation.logicalBlockNum = next;
899 laarr[c + 1].extLocation.partitionReferenceNum =
900 laarr[c].extLocation.
901 partitionReferenceNum;
902 laarr[c + 1].extLength =
903 EXT_NOT_RECORDED_ALLOCATED |
904 (numalloc <<
905 inode->i_sb->s_blocksize_bits);
906 start = c + 1;
907 }
908
909 for (i = start + 1; numalloc && i < *endnum; i++) {
910 int elen = ((laarr[i].extLength &
911 UDF_EXTENT_LENGTH_MASK) +
912 inode->i_sb->s_blocksize - 1) >>
913 inode->i_sb->s_blocksize_bits;
914
915 if (elen > numalloc) {
916 laarr[i].extLength -=
917 (numalloc <<
918 inode->i_sb->s_blocksize_bits);
919 numalloc = 0;
920 } else {
921 numalloc -= elen;
922 if (*endnum > (i + 1))
923 memmove(&laarr[i],
924 &laarr[i + 1],
925 sizeof(struct long_ad) *
926 (*endnum - (i + 1)));
927 i--;
928 (*endnum)--;
929 }
930 }
931 UDF_I(inode)->i_lenExtents +=
932 numalloc << inode->i_sb->s_blocksize_bits;
933 }
934 }
935 }
936
937 static void udf_merge_extents(struct inode *inode,
938 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
939 int *endnum)
940 {
941 int i;
942 unsigned long blocksize = inode->i_sb->s_blocksize;
943 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
944
945 for (i = 0; i < (*endnum - 1); i++) {
946 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
947 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
948
949 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
950 (((li->extLength >> 30) ==
951 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
952 ((lip1->extLocation.logicalBlockNum -
953 li->extLocation.logicalBlockNum) ==
954 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
955 blocksize - 1) >> blocksize_bits)))) {
956
957 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
958 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
959 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
960 lip1->extLength = (lip1->extLength -
961 (li->extLength &
962 UDF_EXTENT_LENGTH_MASK) +
963 UDF_EXTENT_LENGTH_MASK) &
964 ~(blocksize - 1);
965 li->extLength = (li->extLength &
966 UDF_EXTENT_FLAG_MASK) +
967 (UDF_EXTENT_LENGTH_MASK + 1) -
968 blocksize;
969 lip1->extLocation.logicalBlockNum =
970 li->extLocation.logicalBlockNum +
971 ((li->extLength &
972 UDF_EXTENT_LENGTH_MASK) >>
973 blocksize_bits);
974 } else {
975 li->extLength = lip1->extLength +
976 (((li->extLength &
977 UDF_EXTENT_LENGTH_MASK) +
978 blocksize - 1) & ~(blocksize - 1));
979 if (*endnum > (i + 2))
980 memmove(&laarr[i + 1], &laarr[i + 2],
981 sizeof(struct long_ad) *
982 (*endnum - (i + 2)));
983 i--;
984 (*endnum)--;
985 }
986 } else if (((li->extLength >> 30) ==
987 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
988 ((lip1->extLength >> 30) ==
989 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
990 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
991 ((li->extLength &
992 UDF_EXTENT_LENGTH_MASK) +
993 blocksize - 1) >> blocksize_bits);
994 li->extLocation.logicalBlockNum = 0;
995 li->extLocation.partitionReferenceNum = 0;
996
997 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
998 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
999 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1000 lip1->extLength = (lip1->extLength -
1001 (li->extLength &
1002 UDF_EXTENT_LENGTH_MASK) +
1003 UDF_EXTENT_LENGTH_MASK) &
1004 ~(blocksize - 1);
1005 li->extLength = (li->extLength &
1006 UDF_EXTENT_FLAG_MASK) +
1007 (UDF_EXTENT_LENGTH_MASK + 1) -
1008 blocksize;
1009 } else {
1010 li->extLength = lip1->extLength +
1011 (((li->extLength &
1012 UDF_EXTENT_LENGTH_MASK) +
1013 blocksize - 1) & ~(blocksize - 1));
1014 if (*endnum > (i + 2))
1015 memmove(&laarr[i + 1], &laarr[i + 2],
1016 sizeof(struct long_ad) *
1017 (*endnum - (i + 2)));
1018 i--;
1019 (*endnum)--;
1020 }
1021 } else if ((li->extLength >> 30) ==
1022 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1023 udf_free_blocks(inode->i_sb, inode,
1024 &li->extLocation, 0,
1025 ((li->extLength &
1026 UDF_EXTENT_LENGTH_MASK) +
1027 blocksize - 1) >> blocksize_bits);
1028 li->extLocation.logicalBlockNum = 0;
1029 li->extLocation.partitionReferenceNum = 0;
1030 li->extLength = (li->extLength &
1031 UDF_EXTENT_LENGTH_MASK) |
1032 EXT_NOT_RECORDED_NOT_ALLOCATED;
1033 }
1034 }
1035 }
1036
1037 static void udf_update_extents(struct inode *inode,
1038 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1039 int startnum, int endnum,
1040 struct extent_position *epos)
1041 {
1042 int start = 0, i;
1043 struct kernel_lb_addr tmploc;
1044 uint32_t tmplen;
1045
1046 if (startnum > endnum) {
1047 for (i = 0; i < (startnum - endnum); i++)
1048 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1049 laarr[i].extLength);
1050 } else if (startnum < endnum) {
1051 for (i = 0; i < (endnum - startnum); i++) {
1052 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1053 laarr[i].extLength);
1054 udf_next_aext(inode, epos, &laarr[i].extLocation,
1055 &laarr[i].extLength, 1);
1056 start++;
1057 }
1058 }
1059
1060 for (i = start; i < endnum; i++) {
1061 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1062 udf_write_aext(inode, epos, &laarr[i].extLocation,
1063 laarr[i].extLength, 1);
1064 }
1065 }
1066
1067 struct buffer_head *udf_bread(struct inode *inode, int block,
1068 int create, int *err)
1069 {
1070 struct buffer_head *bh = NULL;
1071
1072 bh = udf_getblk(inode, block, create, err);
1073 if (!bh)
1074 return NULL;
1075
1076 if (buffer_uptodate(bh))
1077 return bh;
1078
1079 ll_rw_block(READ, 1, &bh);
1080
1081 wait_on_buffer(bh);
1082 if (buffer_uptodate(bh))
1083 return bh;
1084
1085 brelse(bh);
1086 *err = -EIO;
1087 return NULL;
1088 }
1089
1090 int udf_setsize(struct inode *inode, loff_t newsize)
1091 {
1092 int err;
1093 struct udf_inode_info *iinfo;
1094 int bsize = 1 << inode->i_blkbits;
1095
1096 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1097 S_ISLNK(inode->i_mode)))
1098 return -EINVAL;
1099 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1100 return -EPERM;
1101
1102 iinfo = UDF_I(inode);
1103 if (newsize > inode->i_size) {
1104 down_write(&iinfo->i_data_sem);
1105 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1106 if (bsize <
1107 (udf_file_entry_alloc_offset(inode) + newsize)) {
1108 err = udf_expand_file_adinicb(inode);
1109 if (err) {
1110 up_write(&iinfo->i_data_sem);
1111 return err;
1112 }
1113 } else
1114 iinfo->i_lenAlloc = newsize;
1115 }
1116 err = udf_extend_file(inode, newsize);
1117 if (err) {
1118 up_write(&iinfo->i_data_sem);
1119 return err;
1120 }
1121 truncate_setsize(inode, newsize);
1122 up_write(&iinfo->i_data_sem);
1123 } else {
1124 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1125 down_write(&iinfo->i_data_sem);
1126 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1127 0x00, bsize - newsize -
1128 udf_file_entry_alloc_offset(inode));
1129 iinfo->i_lenAlloc = newsize;
1130 truncate_setsize(inode, newsize);
1131 up_write(&iinfo->i_data_sem);
1132 goto update_time;
1133 }
1134 err = block_truncate_page(inode->i_mapping, newsize,
1135 udf_get_block);
1136 if (err)
1137 return err;
1138 down_write(&iinfo->i_data_sem);
1139 truncate_setsize(inode, newsize);
1140 udf_truncate_extents(inode);
1141 up_write(&iinfo->i_data_sem);
1142 }
1143 update_time:
1144 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1145 if (IS_SYNC(inode))
1146 udf_sync_inode(inode);
1147 else
1148 mark_inode_dirty(inode);
1149 return 0;
1150 }
1151
1152 static void __udf_read_inode(struct inode *inode)
1153 {
1154 struct buffer_head *bh = NULL;
1155 struct fileEntry *fe;
1156 uint16_t ident;
1157 struct udf_inode_info *iinfo = UDF_I(inode);
1158
1159 /*
1160 * Set defaults, but the inode is still incomplete!
1161 * Note: get_new_inode() sets the following on a new inode:
1162 * i_sb = sb
1163 * i_no = ino
1164 * i_flags = sb->s_flags
1165 * i_state = 0
1166 * clean_inode(): zero fills and sets
1167 * i_count = 1
1168 * i_nlink = 1
1169 * i_op = NULL;
1170 */
1171 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1172 if (!bh) {
1173 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1174 inode->i_ino);
1175 make_bad_inode(inode);
1176 return;
1177 }
1178
1179 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1180 ident != TAG_IDENT_USE) {
1181 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1182 "failed ident=%d\n", inode->i_ino, ident);
1183 brelse(bh);
1184 make_bad_inode(inode);
1185 return;
1186 }
1187
1188 fe = (struct fileEntry *)bh->b_data;
1189
1190 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1191 struct buffer_head *ibh;
1192
1193 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1194 &ident);
1195 if (ident == TAG_IDENT_IE && ibh) {
1196 struct buffer_head *nbh = NULL;
1197 struct kernel_lb_addr loc;
1198 struct indirectEntry *ie;
1199
1200 ie = (struct indirectEntry *)ibh->b_data;
1201 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1202
1203 if (ie->indirectICB.extLength &&
1204 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1205 &ident))) {
1206 if (ident == TAG_IDENT_FE ||
1207 ident == TAG_IDENT_EFE) {
1208 memcpy(&iinfo->i_location,
1209 &loc,
1210 sizeof(struct kernel_lb_addr));
1211 brelse(bh);
1212 brelse(ibh);
1213 brelse(nbh);
1214 __udf_read_inode(inode);
1215 return;
1216 }
1217 brelse(nbh);
1218 }
1219 }
1220 brelse(ibh);
1221 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1222 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1223 le16_to_cpu(fe->icbTag.strategyType));
1224 brelse(bh);
1225 make_bad_inode(inode);
1226 return;
1227 }
1228 udf_fill_inode(inode, bh);
1229
1230 brelse(bh);
1231 }
1232
1233 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1234 {
1235 struct fileEntry *fe;
1236 struct extendedFileEntry *efe;
1237 int offset;
1238 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1239 struct udf_inode_info *iinfo = UDF_I(inode);
1240
1241 fe = (struct fileEntry *)bh->b_data;
1242 efe = (struct extendedFileEntry *)bh->b_data;
1243
1244 if (fe->icbTag.strategyType == cpu_to_le16(4))
1245 iinfo->i_strat4096 = 0;
1246 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1247 iinfo->i_strat4096 = 1;
1248
1249 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1250 ICBTAG_FLAG_AD_MASK;
1251 iinfo->i_unique = 0;
1252 iinfo->i_lenEAttr = 0;
1253 iinfo->i_lenExtents = 0;
1254 iinfo->i_lenAlloc = 0;
1255 iinfo->i_next_alloc_block = 0;
1256 iinfo->i_next_alloc_goal = 0;
1257 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1258 iinfo->i_efe = 1;
1259 iinfo->i_use = 0;
1260 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1261 sizeof(struct extendedFileEntry))) {
1262 make_bad_inode(inode);
1263 return;
1264 }
1265 memcpy(iinfo->i_ext.i_data,
1266 bh->b_data + sizeof(struct extendedFileEntry),
1267 inode->i_sb->s_blocksize -
1268 sizeof(struct extendedFileEntry));
1269 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1270 iinfo->i_efe = 0;
1271 iinfo->i_use = 0;
1272 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1273 sizeof(struct fileEntry))) {
1274 make_bad_inode(inode);
1275 return;
1276 }
1277 memcpy(iinfo->i_ext.i_data,
1278 bh->b_data + sizeof(struct fileEntry),
1279 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1280 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1281 iinfo->i_efe = 0;
1282 iinfo->i_use = 1;
1283 iinfo->i_lenAlloc = le32_to_cpu(
1284 ((struct unallocSpaceEntry *)bh->b_data)->
1285 lengthAllocDescs);
1286 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1287 sizeof(struct unallocSpaceEntry))) {
1288 make_bad_inode(inode);
1289 return;
1290 }
1291 memcpy(iinfo->i_ext.i_data,
1292 bh->b_data + sizeof(struct unallocSpaceEntry),
1293 inode->i_sb->s_blocksize -
1294 sizeof(struct unallocSpaceEntry));
1295 return;
1296 }
1297
1298 read_lock(&sbi->s_cred_lock);
1299 inode->i_uid = le32_to_cpu(fe->uid);
1300 if (inode->i_uid == -1 ||
1301 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1302 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1303 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1304
1305 inode->i_gid = le32_to_cpu(fe->gid);
1306 if (inode->i_gid == -1 ||
1307 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1308 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1309 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1310
1311 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1312 sbi->s_fmode != UDF_INVALID_MODE)
1313 inode->i_mode = sbi->s_fmode;
1314 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1315 sbi->s_dmode != UDF_INVALID_MODE)
1316 inode->i_mode = sbi->s_dmode;
1317 else
1318 inode->i_mode = udf_convert_permissions(fe);
1319 inode->i_mode &= ~sbi->s_umask;
1320 read_unlock(&sbi->s_cred_lock);
1321
1322 inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1323 if (!inode->i_nlink)
1324 inode->i_nlink = 1;
1325
1326 inode->i_size = le64_to_cpu(fe->informationLength);
1327 iinfo->i_lenExtents = inode->i_size;
1328
1329 if (iinfo->i_efe == 0) {
1330 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1331 (inode->i_sb->s_blocksize_bits - 9);
1332
1333 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1334 inode->i_atime = sbi->s_record_time;
1335
1336 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1337 fe->modificationTime))
1338 inode->i_mtime = sbi->s_record_time;
1339
1340 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1341 inode->i_ctime = sbi->s_record_time;
1342
1343 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1344 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1345 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1346 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1347 } else {
1348 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1349 (inode->i_sb->s_blocksize_bits - 9);
1350
1351 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1352 inode->i_atime = sbi->s_record_time;
1353
1354 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1355 efe->modificationTime))
1356 inode->i_mtime = sbi->s_record_time;
1357
1358 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1359 iinfo->i_crtime = sbi->s_record_time;
1360
1361 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1362 inode->i_ctime = sbi->s_record_time;
1363
1364 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1365 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1366 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1367 offset = sizeof(struct extendedFileEntry) +
1368 iinfo->i_lenEAttr;
1369 }
1370
1371 switch (fe->icbTag.fileType) {
1372 case ICBTAG_FILE_TYPE_DIRECTORY:
1373 inode->i_op = &udf_dir_inode_operations;
1374 inode->i_fop = &udf_dir_operations;
1375 inode->i_mode |= S_IFDIR;
1376 inc_nlink(inode);
1377 break;
1378 case ICBTAG_FILE_TYPE_REALTIME:
1379 case ICBTAG_FILE_TYPE_REGULAR:
1380 case ICBTAG_FILE_TYPE_UNDEF:
1381 case ICBTAG_FILE_TYPE_VAT20:
1382 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1383 inode->i_data.a_ops = &udf_adinicb_aops;
1384 else
1385 inode->i_data.a_ops = &udf_aops;
1386 inode->i_op = &udf_file_inode_operations;
1387 inode->i_fop = &udf_file_operations;
1388 inode->i_mode |= S_IFREG;
1389 break;
1390 case ICBTAG_FILE_TYPE_BLOCK:
1391 inode->i_mode |= S_IFBLK;
1392 break;
1393 case ICBTAG_FILE_TYPE_CHAR:
1394 inode->i_mode |= S_IFCHR;
1395 break;
1396 case ICBTAG_FILE_TYPE_FIFO:
1397 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1398 break;
1399 case ICBTAG_FILE_TYPE_SOCKET:
1400 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1401 break;
1402 case ICBTAG_FILE_TYPE_SYMLINK:
1403 inode->i_data.a_ops = &udf_symlink_aops;
1404 inode->i_op = &udf_symlink_inode_operations;
1405 inode->i_mode = S_IFLNK | S_IRWXUGO;
1406 break;
1407 case ICBTAG_FILE_TYPE_MAIN:
1408 udf_debug("METADATA FILE-----\n");
1409 break;
1410 case ICBTAG_FILE_TYPE_MIRROR:
1411 udf_debug("METADATA MIRROR FILE-----\n");
1412 break;
1413 case ICBTAG_FILE_TYPE_BITMAP:
1414 udf_debug("METADATA BITMAP FILE-----\n");
1415 break;
1416 default:
1417 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1418 "file type=%d\n", inode->i_ino,
1419 fe->icbTag.fileType);
1420 make_bad_inode(inode);
1421 return;
1422 }
1423 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1424 struct deviceSpec *dsea =
1425 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1426 if (dsea) {
1427 init_special_inode(inode, inode->i_mode,
1428 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1429 le32_to_cpu(dsea->minorDeviceIdent)));
1430 /* Developer ID ??? */
1431 } else
1432 make_bad_inode(inode);
1433 }
1434 }
1435
1436 static int udf_alloc_i_data(struct inode *inode, size_t size)
1437 {
1438 struct udf_inode_info *iinfo = UDF_I(inode);
1439 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1440
1441 if (!iinfo->i_ext.i_data) {
1442 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1443 "no free memory\n", inode->i_ino);
1444 return -ENOMEM;
1445 }
1446
1447 return 0;
1448 }
1449
1450 static mode_t udf_convert_permissions(struct fileEntry *fe)
1451 {
1452 mode_t mode;
1453 uint32_t permissions;
1454 uint32_t flags;
1455
1456 permissions = le32_to_cpu(fe->permissions);
1457 flags = le16_to_cpu(fe->icbTag.flags);
1458
1459 mode = ((permissions) & S_IRWXO) |
1460 ((permissions >> 2) & S_IRWXG) |
1461 ((permissions >> 4) & S_IRWXU) |
1462 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1463 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1464 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1465
1466 return mode;
1467 }
1468
1469 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1470 {
1471 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1472 }
1473
1474 static int udf_sync_inode(struct inode *inode)
1475 {
1476 return udf_update_inode(inode, 1);
1477 }
1478
1479 static int udf_update_inode(struct inode *inode, int do_sync)
1480 {
1481 struct buffer_head *bh = NULL;
1482 struct fileEntry *fe;
1483 struct extendedFileEntry *efe;
1484 uint32_t udfperms;
1485 uint16_t icbflags;
1486 uint16_t crclen;
1487 int err = 0;
1488 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1489 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1490 struct udf_inode_info *iinfo = UDF_I(inode);
1491
1492 bh = udf_tgetblk(inode->i_sb,
1493 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1494 if (!bh) {
1495 udf_debug("getblk failure\n");
1496 return -ENOMEM;
1497 }
1498
1499 lock_buffer(bh);
1500 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1501 fe = (struct fileEntry *)bh->b_data;
1502 efe = (struct extendedFileEntry *)bh->b_data;
1503
1504 if (iinfo->i_use) {
1505 struct unallocSpaceEntry *use =
1506 (struct unallocSpaceEntry *)bh->b_data;
1507
1508 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1509 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1510 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1511 sizeof(struct unallocSpaceEntry));
1512 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1513 use->descTag.tagLocation =
1514 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1515 crclen = sizeof(struct unallocSpaceEntry) +
1516 iinfo->i_lenAlloc - sizeof(struct tag);
1517 use->descTag.descCRCLength = cpu_to_le16(crclen);
1518 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1519 sizeof(struct tag),
1520 crclen));
1521 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1522
1523 goto out;
1524 }
1525
1526 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1527 fe->uid = cpu_to_le32(-1);
1528 else
1529 fe->uid = cpu_to_le32(inode->i_uid);
1530
1531 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1532 fe->gid = cpu_to_le32(-1);
1533 else
1534 fe->gid = cpu_to_le32(inode->i_gid);
1535
1536 udfperms = ((inode->i_mode & S_IRWXO)) |
1537 ((inode->i_mode & S_IRWXG) << 2) |
1538 ((inode->i_mode & S_IRWXU) << 4);
1539
1540 udfperms |= (le32_to_cpu(fe->permissions) &
1541 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1542 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1543 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1544 fe->permissions = cpu_to_le32(udfperms);
1545
1546 if (S_ISDIR(inode->i_mode))
1547 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1548 else
1549 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1550
1551 fe->informationLength = cpu_to_le64(inode->i_size);
1552
1553 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1554 struct regid *eid;
1555 struct deviceSpec *dsea =
1556 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1557 if (!dsea) {
1558 dsea = (struct deviceSpec *)
1559 udf_add_extendedattr(inode,
1560 sizeof(struct deviceSpec) +
1561 sizeof(struct regid), 12, 0x3);
1562 dsea->attrType = cpu_to_le32(12);
1563 dsea->attrSubtype = 1;
1564 dsea->attrLength = cpu_to_le32(
1565 sizeof(struct deviceSpec) +
1566 sizeof(struct regid));
1567 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1568 }
1569 eid = (struct regid *)dsea->impUse;
1570 memset(eid, 0, sizeof(struct regid));
1571 strcpy(eid->ident, UDF_ID_DEVELOPER);
1572 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1573 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1574 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1575 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1576 }
1577
1578 if (iinfo->i_efe == 0) {
1579 memcpy(bh->b_data + sizeof(struct fileEntry),
1580 iinfo->i_ext.i_data,
1581 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1582 fe->logicalBlocksRecorded = cpu_to_le64(
1583 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1584 (blocksize_bits - 9));
1585
1586 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1587 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1588 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1589 memset(&(fe->impIdent), 0, sizeof(struct regid));
1590 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1591 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1592 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1593 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1594 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1595 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1596 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1597 crclen = sizeof(struct fileEntry);
1598 } else {
1599 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1600 iinfo->i_ext.i_data,
1601 inode->i_sb->s_blocksize -
1602 sizeof(struct extendedFileEntry));
1603 efe->objectSize = cpu_to_le64(inode->i_size);
1604 efe->logicalBlocksRecorded = cpu_to_le64(
1605 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1606 (blocksize_bits - 9));
1607
1608 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1609 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1610 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1611 iinfo->i_crtime = inode->i_atime;
1612
1613 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1614 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1615 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1616 iinfo->i_crtime = inode->i_mtime;
1617
1618 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1619 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1620 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1621 iinfo->i_crtime = inode->i_ctime;
1622
1623 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1624 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1625 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1626 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1627
1628 memset(&(efe->impIdent), 0, sizeof(struct regid));
1629 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1630 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1631 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1632 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1633 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1634 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1635 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1636 crclen = sizeof(struct extendedFileEntry);
1637 }
1638 if (iinfo->i_strat4096) {
1639 fe->icbTag.strategyType = cpu_to_le16(4096);
1640 fe->icbTag.strategyParameter = cpu_to_le16(1);
1641 fe->icbTag.numEntries = cpu_to_le16(2);
1642 } else {
1643 fe->icbTag.strategyType = cpu_to_le16(4);
1644 fe->icbTag.numEntries = cpu_to_le16(1);
1645 }
1646
1647 if (S_ISDIR(inode->i_mode))
1648 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1649 else if (S_ISREG(inode->i_mode))
1650 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1651 else if (S_ISLNK(inode->i_mode))
1652 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1653 else if (S_ISBLK(inode->i_mode))
1654 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1655 else if (S_ISCHR(inode->i_mode))
1656 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1657 else if (S_ISFIFO(inode->i_mode))
1658 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1659 else if (S_ISSOCK(inode->i_mode))
1660 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1661
1662 icbflags = iinfo->i_alloc_type |
1663 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1664 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1665 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1666 (le16_to_cpu(fe->icbTag.flags) &
1667 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1668 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1669
1670 fe->icbTag.flags = cpu_to_le16(icbflags);
1671 if (sbi->s_udfrev >= 0x0200)
1672 fe->descTag.descVersion = cpu_to_le16(3);
1673 else
1674 fe->descTag.descVersion = cpu_to_le16(2);
1675 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1676 fe->descTag.tagLocation = cpu_to_le32(
1677 iinfo->i_location.logicalBlockNum);
1678 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1679 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1680 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1681 crclen));
1682 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1683
1684 out:
1685 set_buffer_uptodate(bh);
1686 unlock_buffer(bh);
1687
1688 /* write the data blocks */
1689 mark_buffer_dirty(bh);
1690 if (do_sync) {
1691 sync_dirty_buffer(bh);
1692 if (buffer_write_io_error(bh)) {
1693 printk(KERN_WARNING "IO error syncing udf inode "
1694 "[%s:%08lx]\n", inode->i_sb->s_id,
1695 inode->i_ino);
1696 err = -EIO;
1697 }
1698 }
1699 brelse(bh);
1700
1701 return err;
1702 }
1703
1704 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1705 {
1706 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1707 struct inode *inode = iget_locked(sb, block);
1708
1709 if (!inode)
1710 return NULL;
1711
1712 if (inode->i_state & I_NEW) {
1713 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1714 __udf_read_inode(inode);
1715 unlock_new_inode(inode);
1716 }
1717
1718 if (is_bad_inode(inode))
1719 goto out_iput;
1720
1721 if (ino->logicalBlockNum >= UDF_SB(sb)->
1722 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1723 udf_debug("block=%d, partition=%d out of range\n",
1724 ino->logicalBlockNum, ino->partitionReferenceNum);
1725 make_bad_inode(inode);
1726 goto out_iput;
1727 }
1728
1729 return inode;
1730
1731 out_iput:
1732 iput(inode);
1733 return NULL;
1734 }
1735
1736 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1737 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1738 {
1739 int adsize;
1740 struct short_ad *sad = NULL;
1741 struct long_ad *lad = NULL;
1742 struct allocExtDesc *aed;
1743 uint8_t *ptr;
1744 struct udf_inode_info *iinfo = UDF_I(inode);
1745
1746 if (!epos->bh)
1747 ptr = iinfo->i_ext.i_data + epos->offset -
1748 udf_file_entry_alloc_offset(inode) +
1749 iinfo->i_lenEAttr;
1750 else
1751 ptr = epos->bh->b_data + epos->offset;
1752
1753 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1754 adsize = sizeof(struct short_ad);
1755 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1756 adsize = sizeof(struct long_ad);
1757 else
1758 return -EIO;
1759
1760 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1761 unsigned char *sptr, *dptr;
1762 struct buffer_head *nbh;
1763 int err, loffset;
1764 struct kernel_lb_addr obloc = epos->block;
1765
1766 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1767 obloc.partitionReferenceNum,
1768 obloc.logicalBlockNum, &err);
1769 if (!epos->block.logicalBlockNum)
1770 return -ENOSPC;
1771 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1772 &epos->block,
1773 0));
1774 if (!nbh)
1775 return -EIO;
1776 lock_buffer(nbh);
1777 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1778 set_buffer_uptodate(nbh);
1779 unlock_buffer(nbh);
1780 mark_buffer_dirty_inode(nbh, inode);
1781
1782 aed = (struct allocExtDesc *)(nbh->b_data);
1783 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1784 aed->previousAllocExtLocation =
1785 cpu_to_le32(obloc.logicalBlockNum);
1786 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1787 loffset = epos->offset;
1788 aed->lengthAllocDescs = cpu_to_le32(adsize);
1789 sptr = ptr - adsize;
1790 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1791 memcpy(dptr, sptr, adsize);
1792 epos->offset = sizeof(struct allocExtDesc) + adsize;
1793 } else {
1794 loffset = epos->offset + adsize;
1795 aed->lengthAllocDescs = cpu_to_le32(0);
1796 sptr = ptr;
1797 epos->offset = sizeof(struct allocExtDesc);
1798
1799 if (epos->bh) {
1800 aed = (struct allocExtDesc *)epos->bh->b_data;
1801 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1802 } else {
1803 iinfo->i_lenAlloc += adsize;
1804 mark_inode_dirty(inode);
1805 }
1806 }
1807 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1808 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1809 epos->block.logicalBlockNum, sizeof(struct tag));
1810 else
1811 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1812 epos->block.logicalBlockNum, sizeof(struct tag));
1813 switch (iinfo->i_alloc_type) {
1814 case ICBTAG_FLAG_AD_SHORT:
1815 sad = (struct short_ad *)sptr;
1816 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1817 inode->i_sb->s_blocksize);
1818 sad->extPosition =
1819 cpu_to_le32(epos->block.logicalBlockNum);
1820 break;
1821 case ICBTAG_FLAG_AD_LONG:
1822 lad = (struct long_ad *)sptr;
1823 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1824 inode->i_sb->s_blocksize);
1825 lad->extLocation = cpu_to_lelb(epos->block);
1826 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1827 break;
1828 }
1829 if (epos->bh) {
1830 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1831 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1832 udf_update_tag(epos->bh->b_data, loffset);
1833 else
1834 udf_update_tag(epos->bh->b_data,
1835 sizeof(struct allocExtDesc));
1836 mark_buffer_dirty_inode(epos->bh, inode);
1837 brelse(epos->bh);
1838 } else {
1839 mark_inode_dirty(inode);
1840 }
1841 epos->bh = nbh;
1842 }
1843
1844 udf_write_aext(inode, epos, eloc, elen, inc);
1845
1846 if (!epos->bh) {
1847 iinfo->i_lenAlloc += adsize;
1848 mark_inode_dirty(inode);
1849 } else {
1850 aed = (struct allocExtDesc *)epos->bh->b_data;
1851 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1852 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1853 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1854 udf_update_tag(epos->bh->b_data,
1855 epos->offset + (inc ? 0 : adsize));
1856 else
1857 udf_update_tag(epos->bh->b_data,
1858 sizeof(struct allocExtDesc));
1859 mark_buffer_dirty_inode(epos->bh, inode);
1860 }
1861
1862 return 0;
1863 }
1864
1865 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1866 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1867 {
1868 int adsize;
1869 uint8_t *ptr;
1870 struct short_ad *sad;
1871 struct long_ad *lad;
1872 struct udf_inode_info *iinfo = UDF_I(inode);
1873
1874 if (!epos->bh)
1875 ptr = iinfo->i_ext.i_data + epos->offset -
1876 udf_file_entry_alloc_offset(inode) +
1877 iinfo->i_lenEAttr;
1878 else
1879 ptr = epos->bh->b_data + epos->offset;
1880
1881 switch (iinfo->i_alloc_type) {
1882 case ICBTAG_FLAG_AD_SHORT:
1883 sad = (struct short_ad *)ptr;
1884 sad->extLength = cpu_to_le32(elen);
1885 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1886 adsize = sizeof(struct short_ad);
1887 break;
1888 case ICBTAG_FLAG_AD_LONG:
1889 lad = (struct long_ad *)ptr;
1890 lad->extLength = cpu_to_le32(elen);
1891 lad->extLocation = cpu_to_lelb(*eloc);
1892 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1893 adsize = sizeof(struct long_ad);
1894 break;
1895 default:
1896 return;
1897 }
1898
1899 if (epos->bh) {
1900 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1901 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1902 struct allocExtDesc *aed =
1903 (struct allocExtDesc *)epos->bh->b_data;
1904 udf_update_tag(epos->bh->b_data,
1905 le32_to_cpu(aed->lengthAllocDescs) +
1906 sizeof(struct allocExtDesc));
1907 }
1908 mark_buffer_dirty_inode(epos->bh, inode);
1909 } else {
1910 mark_inode_dirty(inode);
1911 }
1912
1913 if (inc)
1914 epos->offset += adsize;
1915 }
1916
1917 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1918 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1919 {
1920 int8_t etype;
1921
1922 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1923 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1924 int block;
1925 epos->block = *eloc;
1926 epos->offset = sizeof(struct allocExtDesc);
1927 brelse(epos->bh);
1928 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1929 epos->bh = udf_tread(inode->i_sb, block);
1930 if (!epos->bh) {
1931 udf_debug("reading block %d failed!\n", block);
1932 return -1;
1933 }
1934 }
1935
1936 return etype;
1937 }
1938
1939 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1940 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1941 {
1942 int alen;
1943 int8_t etype;
1944 uint8_t *ptr;
1945 struct short_ad *sad;
1946 struct long_ad *lad;
1947 struct udf_inode_info *iinfo = UDF_I(inode);
1948
1949 if (!epos->bh) {
1950 if (!epos->offset)
1951 epos->offset = udf_file_entry_alloc_offset(inode);
1952 ptr = iinfo->i_ext.i_data + epos->offset -
1953 udf_file_entry_alloc_offset(inode) +
1954 iinfo->i_lenEAttr;
1955 alen = udf_file_entry_alloc_offset(inode) +
1956 iinfo->i_lenAlloc;
1957 } else {
1958 if (!epos->offset)
1959 epos->offset = sizeof(struct allocExtDesc);
1960 ptr = epos->bh->b_data + epos->offset;
1961 alen = sizeof(struct allocExtDesc) +
1962 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1963 lengthAllocDescs);
1964 }
1965
1966 switch (iinfo->i_alloc_type) {
1967 case ICBTAG_FLAG_AD_SHORT:
1968 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1969 if (!sad)
1970 return -1;
1971 etype = le32_to_cpu(sad->extLength) >> 30;
1972 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1973 eloc->partitionReferenceNum =
1974 iinfo->i_location.partitionReferenceNum;
1975 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1976 break;
1977 case ICBTAG_FLAG_AD_LONG:
1978 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1979 if (!lad)
1980 return -1;
1981 etype = le32_to_cpu(lad->extLength) >> 30;
1982 *eloc = lelb_to_cpu(lad->extLocation);
1983 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1984 break;
1985 default:
1986 udf_debug("alloc_type = %d unsupported\n",
1987 iinfo->i_alloc_type);
1988 return -1;
1989 }
1990
1991 return etype;
1992 }
1993
1994 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1995 struct kernel_lb_addr neloc, uint32_t nelen)
1996 {
1997 struct kernel_lb_addr oeloc;
1998 uint32_t oelen;
1999 int8_t etype;
2000
2001 if (epos.bh)
2002 get_bh(epos.bh);
2003
2004 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2005 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2006 neloc = oeloc;
2007 nelen = (etype << 30) | oelen;
2008 }
2009 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2010 brelse(epos.bh);
2011
2012 return (nelen >> 30);
2013 }
2014
2015 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2016 struct kernel_lb_addr eloc, uint32_t elen)
2017 {
2018 struct extent_position oepos;
2019 int adsize;
2020 int8_t etype;
2021 struct allocExtDesc *aed;
2022 struct udf_inode_info *iinfo;
2023
2024 if (epos.bh) {
2025 get_bh(epos.bh);
2026 get_bh(epos.bh);
2027 }
2028
2029 iinfo = UDF_I(inode);
2030 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2031 adsize = sizeof(struct short_ad);
2032 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2033 adsize = sizeof(struct long_ad);
2034 else
2035 adsize = 0;
2036
2037 oepos = epos;
2038 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2039 return -1;
2040
2041 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2042 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2043 if (oepos.bh != epos.bh) {
2044 oepos.block = epos.block;
2045 brelse(oepos.bh);
2046 get_bh(epos.bh);
2047 oepos.bh = epos.bh;
2048 oepos.offset = epos.offset - adsize;
2049 }
2050 }
2051 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2052 elen = 0;
2053
2054 if (epos.bh != oepos.bh) {
2055 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2056 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2057 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2058 if (!oepos.bh) {
2059 iinfo->i_lenAlloc -= (adsize * 2);
2060 mark_inode_dirty(inode);
2061 } else {
2062 aed = (struct allocExtDesc *)oepos.bh->b_data;
2063 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2064 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2065 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2066 udf_update_tag(oepos.bh->b_data,
2067 oepos.offset - (2 * adsize));
2068 else
2069 udf_update_tag(oepos.bh->b_data,
2070 sizeof(struct allocExtDesc));
2071 mark_buffer_dirty_inode(oepos.bh, inode);
2072 }
2073 } else {
2074 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2075 if (!oepos.bh) {
2076 iinfo->i_lenAlloc -= adsize;
2077 mark_inode_dirty(inode);
2078 } else {
2079 aed = (struct allocExtDesc *)oepos.bh->b_data;
2080 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2081 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2082 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2083 udf_update_tag(oepos.bh->b_data,
2084 epos.offset - adsize);
2085 else
2086 udf_update_tag(oepos.bh->b_data,
2087 sizeof(struct allocExtDesc));
2088 mark_buffer_dirty_inode(oepos.bh, inode);
2089 }
2090 }
2091
2092 brelse(epos.bh);
2093 brelse(oepos.bh);
2094
2095 return (elen >> 30);
2096 }
2097
2098 int8_t inode_bmap(struct inode *inode, sector_t block,
2099 struct extent_position *pos, struct kernel_lb_addr *eloc,
2100 uint32_t *elen, sector_t *offset)
2101 {
2102 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2103 loff_t lbcount = 0, bcount =
2104 (loff_t) block << blocksize_bits;
2105 int8_t etype;
2106 struct udf_inode_info *iinfo;
2107
2108 iinfo = UDF_I(inode);
2109 pos->offset = 0;
2110 pos->block = iinfo->i_location;
2111 pos->bh = NULL;
2112 *elen = 0;
2113
2114 do {
2115 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2116 if (etype == -1) {
2117 *offset = (bcount - lbcount) >> blocksize_bits;
2118 iinfo->i_lenExtents = lbcount;
2119 return -1;
2120 }
2121 lbcount += *elen;
2122 } while (lbcount <= bcount);
2123
2124 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2125
2126 return etype;
2127 }
2128
2129 long udf_block_map(struct inode *inode, sector_t block)
2130 {
2131 struct kernel_lb_addr eloc;
2132 uint32_t elen;
2133 sector_t offset;
2134 struct extent_position epos = {};
2135 int ret;
2136
2137 down_read(&UDF_I(inode)->i_data_sem);
2138
2139 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2140 (EXT_RECORDED_ALLOCATED >> 30))
2141 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2142 else
2143 ret = 0;
2144
2145 up_read(&UDF_I(inode)->i_data_sem);
2146 brelse(epos.bh);
2147
2148 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2149 return udf_fixed_to_variable(ret);
2150 else
2151 return ret;
2152 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree