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udf: Protect default inode credentials by rwlock
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / inode.c
blobfa3c1541151c114e856f32b2e1e187d689b3efb8
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/smp_lock.h>
35 #include <linux/module.h>
36 #include <linux/pagemap.h>
37 #include <linux/buffer_head.h>
38 #include <linux/writeback.h>
39 #include <linux/slab.h>
40 #include <linux/crc-itu-t.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 mode_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 struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
57 sector_t *, int *);
58 static int8_t udf_insert_aext(struct inode *, struct extent_position,
59 struct kernel_lb_addr, uint32_t);
60 static void udf_split_extents(struct inode *, int *, int, int,
61 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
62 static void udf_prealloc_extents(struct inode *, int, int,
63 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
64 static void udf_merge_extents(struct inode *,
65 struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
66 static void udf_update_extents(struct inode *,
67 struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
68 struct extent_position *);
69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
70
71
72 void udf_evict_inode(struct inode *inode)
73 {
74 struct udf_inode_info *iinfo = UDF_I(inode);
75 int want_delete = 0;
76
77 truncate_inode_pages(&inode->i_data, 0);
78
79 if (!inode->i_nlink && !is_bad_inode(inode)) {
80 want_delete = 1;
81 inode->i_size = 0;
82 udf_truncate(inode);
83 udf_update_inode(inode, IS_SYNC(inode));
84 }
85 invalidate_inode_buffers(inode);
86 end_writeback(inode);
87 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
88 inode->i_size != iinfo->i_lenExtents) {
89 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
90 "inode size %llu different from extent length %llu. "
91 "Filesystem need not be standards compliant.\n",
92 inode->i_sb->s_id, inode->i_ino, inode->i_mode,
93 (unsigned long long)inode->i_size,
94 (unsigned long long)iinfo->i_lenExtents);
95 }
96 kfree(iinfo->i_ext.i_data);
97 iinfo->i_ext.i_data = NULL;
98 if (want_delete) {
99 lock_kernel();
100 udf_free_inode(inode);
101 unlock_kernel();
102 }
103 }
104
105 static int udf_writepage(struct page *page, struct writeback_control *wbc)
106 {
107 return block_write_full_page(page, udf_get_block, wbc);
108 }
109
110 static int udf_readpage(struct file *file, struct page *page)
111 {
112 return block_read_full_page(page, udf_get_block);
113 }
114
115 static int udf_write_begin(struct file *file, struct address_space *mapping,
116 loff_t pos, unsigned len, unsigned flags,
117 struct page **pagep, void **fsdata)
118 {
119 int ret;
120
121 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
122 if (unlikely(ret)) {
123 loff_t isize = mapping->host->i_size;
124 if (pos + len > isize)
125 vmtruncate(mapping->host, isize);
126 }
127
128 return ret;
129 }
130
131 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
132 {
133 return generic_block_bmap(mapping, block, udf_get_block);
134 }
135
136 const struct address_space_operations udf_aops = {
137 .readpage = udf_readpage,
138 .writepage = udf_writepage,
139 .sync_page = block_sync_page,
140 .write_begin = udf_write_begin,
141 .write_end = generic_write_end,
142 .bmap = udf_bmap,
143 };
144
145 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
146 {
147 struct page *page;
148 char *kaddr;
149 struct udf_inode_info *iinfo = UDF_I(inode);
150 struct writeback_control udf_wbc = {
151 .sync_mode = WB_SYNC_NONE,
152 .nr_to_write = 1,
153 };
154
155 /* from now on we have normal address_space methods */
156 inode->i_data.a_ops = &udf_aops;
157
158 if (!iinfo->i_lenAlloc) {
159 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
160 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
161 else
162 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
163 mark_inode_dirty(inode);
164 return;
165 }
166
167 page = grab_cache_page(inode->i_mapping, 0);
168 BUG_ON(!PageLocked(page));
169
170 if (!PageUptodate(page)) {
171 kaddr = kmap(page);
172 memset(kaddr + iinfo->i_lenAlloc, 0x00,
173 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
174 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
175 iinfo->i_lenAlloc);
176 flush_dcache_page(page);
177 SetPageUptodate(page);
178 kunmap(page);
179 }
180 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
181 iinfo->i_lenAlloc);
182 iinfo->i_lenAlloc = 0;
183 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
184 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
185 else
186 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
187
188 inode->i_data.a_ops->writepage(page, &udf_wbc);
189 page_cache_release(page);
190
191 mark_inode_dirty(inode);
192 }
193
194 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
195 int *err)
196 {
197 int newblock;
198 struct buffer_head *dbh = NULL;
199 struct kernel_lb_addr eloc;
200 uint8_t alloctype;
201 struct extent_position epos;
202
203 struct udf_fileident_bh sfibh, dfibh;
204 loff_t f_pos = udf_ext0_offset(inode);
205 int size = udf_ext0_offset(inode) + inode->i_size;
206 struct fileIdentDesc cfi, *sfi, *dfi;
207 struct udf_inode_info *iinfo = UDF_I(inode);
208
209 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
210 alloctype = ICBTAG_FLAG_AD_SHORT;
211 else
212 alloctype = ICBTAG_FLAG_AD_LONG;
213
214 if (!inode->i_size) {
215 iinfo->i_alloc_type = alloctype;
216 mark_inode_dirty(inode);
217 return NULL;
218 }
219
220 /* alloc block, and copy data to it */
221 *block = udf_new_block(inode->i_sb, inode,
222 iinfo->i_location.partitionReferenceNum,
223 iinfo->i_location.logicalBlockNum, err);
224 if (!(*block))
225 return NULL;
226 newblock = udf_get_pblock(inode->i_sb, *block,
227 iinfo->i_location.partitionReferenceNum,
228 0);
229 if (!newblock)
230 return NULL;
231 dbh = udf_tgetblk(inode->i_sb, newblock);
232 if (!dbh)
233 return NULL;
234 lock_buffer(dbh);
235 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
236 set_buffer_uptodate(dbh);
237 unlock_buffer(dbh);
238 mark_buffer_dirty_inode(dbh, inode);
239
240 sfibh.soffset = sfibh.eoffset =
241 f_pos & (inode->i_sb->s_blocksize - 1);
242 sfibh.sbh = sfibh.ebh = NULL;
243 dfibh.soffset = dfibh.eoffset = 0;
244 dfibh.sbh = dfibh.ebh = dbh;
245 while (f_pos < size) {
246 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
247 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
248 NULL, NULL, NULL);
249 if (!sfi) {
250 brelse(dbh);
251 return NULL;
252 }
253 iinfo->i_alloc_type = alloctype;
254 sfi->descTag.tagLocation = cpu_to_le32(*block);
255 dfibh.soffset = dfibh.eoffset;
256 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
257 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
258 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
259 sfi->fileIdent +
260 le16_to_cpu(sfi->lengthOfImpUse))) {
261 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
262 brelse(dbh);
263 return NULL;
264 }
265 }
266 mark_buffer_dirty_inode(dbh, inode);
267
268 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
269 iinfo->i_lenAlloc);
270 iinfo->i_lenAlloc = 0;
271 eloc.logicalBlockNum = *block;
272 eloc.partitionReferenceNum =
273 iinfo->i_location.partitionReferenceNum;
274 iinfo->i_lenExtents = inode->i_size;
275 epos.bh = NULL;
276 epos.block = iinfo->i_location;
277 epos.offset = udf_file_entry_alloc_offset(inode);
278 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
279 /* UniqueID stuff */
280
281 brelse(epos.bh);
282 mark_inode_dirty(inode);
283 return dbh;
284 }
285
286 static int udf_get_block(struct inode *inode, sector_t block,
287 struct buffer_head *bh_result, int create)
288 {
289 int err, new;
290 struct buffer_head *bh;
291 sector_t phys = 0;
292 struct udf_inode_info *iinfo;
293
294 if (!create) {
295 phys = udf_block_map(inode, block);
296 if (phys)
297 map_bh(bh_result, inode->i_sb, phys);
298 return 0;
299 }
300
301 err = -EIO;
302 new = 0;
303 bh = NULL;
304
305 lock_kernel();
306
307 iinfo = UDF_I(inode);
308 if (block == iinfo->i_next_alloc_block + 1) {
309 iinfo->i_next_alloc_block++;
310 iinfo->i_next_alloc_goal++;
311 }
312
313 err = 0;
314
315 bh = inode_getblk(inode, block, &err, &phys, &new);
316 BUG_ON(bh);
317 if (err)
318 goto abort;
319 BUG_ON(!phys);
320
321 if (new)
322 set_buffer_new(bh_result);
323 map_bh(bh_result, inode->i_sb, phys);
324
325 abort:
326 unlock_kernel();
327 return err;
328 }
329
330 static struct buffer_head *udf_getblk(struct inode *inode, long block,
331 int create, int *err)
332 {
333 struct buffer_head *bh;
334 struct buffer_head dummy;
335
336 dummy.b_state = 0;
337 dummy.b_blocknr = -1000;
338 *err = udf_get_block(inode, block, &dummy, create);
339 if (!*err && buffer_mapped(&dummy)) {
340 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
341 if (buffer_new(&dummy)) {
342 lock_buffer(bh);
343 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
344 set_buffer_uptodate(bh);
345 unlock_buffer(bh);
346 mark_buffer_dirty_inode(bh, inode);
347 }
348 return bh;
349 }
350
351 return NULL;
352 }
353
354 /* Extend the file by 'blocks' blocks, return the number of extents added */
355 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
356 struct kernel_long_ad *last_ext, sector_t blocks)
357 {
358 sector_t add;
359 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
360 struct super_block *sb = inode->i_sb;
361 struct kernel_lb_addr prealloc_loc = {};
362 int prealloc_len = 0;
363 struct udf_inode_info *iinfo;
364
365 /* The previous extent is fake and we should not extend by anything
366 * - there's nothing to do... */
367 if (!blocks && fake)
368 return 0;
369
370 iinfo = UDF_I(inode);
371 /* Round the last extent up to a multiple of block size */
372 if (last_ext->extLength & (sb->s_blocksize - 1)) {
373 last_ext->extLength =
374 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
375 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
376 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
377 iinfo->i_lenExtents =
378 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
379 ~(sb->s_blocksize - 1);
380 }
381
382 /* Last extent are just preallocated blocks? */
383 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
384 EXT_NOT_RECORDED_ALLOCATED) {
385 /* Save the extent so that we can reattach it to the end */
386 prealloc_loc = last_ext->extLocation;
387 prealloc_len = last_ext->extLength;
388 /* Mark the extent as a hole */
389 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
390 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
391 last_ext->extLocation.logicalBlockNum = 0;
392 last_ext->extLocation.partitionReferenceNum = 0;
393 }
394
395 /* Can we merge with the previous extent? */
396 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
397 EXT_NOT_RECORDED_NOT_ALLOCATED) {
398 add = ((1 << 30) - sb->s_blocksize -
399 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
400 sb->s_blocksize_bits;
401 if (add > blocks)
402 add = blocks;
403 blocks -= add;
404 last_ext->extLength += add << sb->s_blocksize_bits;
405 }
406
407 if (fake) {
408 udf_add_aext(inode, last_pos, &last_ext->extLocation,
409 last_ext->extLength, 1);
410 count++;
411 } else
412 udf_write_aext(inode, last_pos, &last_ext->extLocation,
413 last_ext->extLength, 1);
414
415 /* Managed to do everything necessary? */
416 if (!blocks)
417 goto out;
418
419 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
420 last_ext->extLocation.logicalBlockNum = 0;
421 last_ext->extLocation.partitionReferenceNum = 0;
422 add = (1 << (30-sb->s_blocksize_bits)) - 1;
423 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
424 (add << sb->s_blocksize_bits);
425
426 /* Create enough extents to cover the whole hole */
427 while (blocks > add) {
428 blocks -= add;
429 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
430 last_ext->extLength, 1) == -1)
431 return -1;
432 count++;
433 }
434 if (blocks) {
435 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
436 (blocks << sb->s_blocksize_bits);
437 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
438 last_ext->extLength, 1) == -1)
439 return -1;
440 count++;
441 }
442
443 out:
444 /* Do we have some preallocated blocks saved? */
445 if (prealloc_len) {
446 if (udf_add_aext(inode, last_pos, &prealloc_loc,
447 prealloc_len, 1) == -1)
448 return -1;
449 last_ext->extLocation = prealloc_loc;
450 last_ext->extLength = prealloc_len;
451 count++;
452 }
453
454 /* last_pos should point to the last written extent... */
455 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
456 last_pos->offset -= sizeof(struct short_ad);
457 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
458 last_pos->offset -= sizeof(struct long_ad);
459 else
460 return -1;
461
462 return count;
463 }
464
465 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
466 int *err, sector_t *phys, int *new)
467 {
468 static sector_t last_block;
469 struct buffer_head *result = NULL;
470 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
471 struct extent_position prev_epos, cur_epos, next_epos;
472 int count = 0, startnum = 0, endnum = 0;
473 uint32_t elen = 0, tmpelen;
474 struct kernel_lb_addr eloc, tmpeloc;
475 int c = 1;
476 loff_t lbcount = 0, b_off = 0;
477 uint32_t newblocknum, newblock;
478 sector_t offset = 0;
479 int8_t etype;
480 struct udf_inode_info *iinfo = UDF_I(inode);
481 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
482 int lastblock = 0;
483
484 prev_epos.offset = udf_file_entry_alloc_offset(inode);
485 prev_epos.block = iinfo->i_location;
486 prev_epos.bh = NULL;
487 cur_epos = next_epos = prev_epos;
488 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
489
490 /* find the extent which contains the block we are looking for.
491 alternate between laarr[0] and laarr[1] for locations of the
492 current extent, and the previous extent */
493 do {
494 if (prev_epos.bh != cur_epos.bh) {
495 brelse(prev_epos.bh);
496 get_bh(cur_epos.bh);
497 prev_epos.bh = cur_epos.bh;
498 }
499 if (cur_epos.bh != next_epos.bh) {
500 brelse(cur_epos.bh);
501 get_bh(next_epos.bh);
502 cur_epos.bh = next_epos.bh;
503 }
504
505 lbcount += elen;
506
507 prev_epos.block = cur_epos.block;
508 cur_epos.block = next_epos.block;
509
510 prev_epos.offset = cur_epos.offset;
511 cur_epos.offset = next_epos.offset;
512
513 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
514 if (etype == -1)
515 break;
516
517 c = !c;
518
519 laarr[c].extLength = (etype << 30) | elen;
520 laarr[c].extLocation = eloc;
521
522 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
523 pgoal = eloc.logicalBlockNum +
524 ((elen + inode->i_sb->s_blocksize - 1) >>
525 inode->i_sb->s_blocksize_bits);
526
527 count++;
528 } while (lbcount + elen <= b_off);
529
530 b_off -= lbcount;
531 offset = b_off >> inode->i_sb->s_blocksize_bits;
532 /*
533 * Move prev_epos and cur_epos into indirect extent if we are at
534 * the pointer to it
535 */
536 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
537 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
538
539 /* if the extent is allocated and recorded, return the block
540 if the extent is not a multiple of the blocksize, round up */
541
542 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
543 if (elen & (inode->i_sb->s_blocksize - 1)) {
544 elen = EXT_RECORDED_ALLOCATED |
545 ((elen + inode->i_sb->s_blocksize - 1) &
546 ~(inode->i_sb->s_blocksize - 1));
547 etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
548 }
549 brelse(prev_epos.bh);
550 brelse(cur_epos.bh);
551 brelse(next_epos.bh);
552 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
553 *phys = newblock;
554 return NULL;
555 }
556
557 last_block = block;
558 /* Are we beyond EOF? */
559 if (etype == -1) {
560 int ret;
561
562 if (count) {
563 if (c)
564 laarr[0] = laarr[1];
565 startnum = 1;
566 } else {
567 /* Create a fake extent when there's not one */
568 memset(&laarr[0].extLocation, 0x00,
569 sizeof(struct kernel_lb_addr));
570 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
571 /* Will udf_extend_file() create real extent from
572 a fake one? */
573 startnum = (offset > 0);
574 }
575 /* Create extents for the hole between EOF and offset */
576 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
577 if (ret == -1) {
578 brelse(prev_epos.bh);
579 brelse(cur_epos.bh);
580 brelse(next_epos.bh);
581 /* We don't really know the error here so we just make
582 * something up */
583 *err = -ENOSPC;
584 return NULL;
585 }
586 c = 0;
587 offset = 0;
588 count += ret;
589 /* We are not covered by a preallocated extent? */
590 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
591 EXT_NOT_RECORDED_ALLOCATED) {
592 /* Is there any real extent? - otherwise we overwrite
593 * the fake one... */
594 if (count)
595 c = !c;
596 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
597 inode->i_sb->s_blocksize;
598 memset(&laarr[c].extLocation, 0x00,
599 sizeof(struct kernel_lb_addr));
600 count++;
601 endnum++;
602 }
603 endnum = c + 1;
604 lastblock = 1;
605 } else {
606 endnum = startnum = ((count > 2) ? 2 : count);
607
608 /* if the current extent is in position 0,
609 swap it with the previous */
610 if (!c && count != 1) {
611 laarr[2] = laarr[0];
612 laarr[0] = laarr[1];
613 laarr[1] = laarr[2];
614 c = 1;
615 }
616
617 /* if the current block is located in an extent,
618 read the next extent */
619 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
620 if (etype != -1) {
621 laarr[c + 1].extLength = (etype << 30) | elen;
622 laarr[c + 1].extLocation = eloc;
623 count++;
624 startnum++;
625 endnum++;
626 } else
627 lastblock = 1;
628 }
629
630 /* if the current extent is not recorded but allocated, get the
631 * block in the extent corresponding to the requested block */
632 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
633 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
634 else { /* otherwise, allocate a new block */
635 if (iinfo->i_next_alloc_block == block)
636 goal = iinfo->i_next_alloc_goal;
637
638 if (!goal) {
639 if (!(goal = pgoal)) /* XXX: what was intended here? */
640 goal = iinfo->i_location.logicalBlockNum + 1;
641 }
642
643 newblocknum = udf_new_block(inode->i_sb, inode,
644 iinfo->i_location.partitionReferenceNum,
645 goal, err);
646 if (!newblocknum) {
647 brelse(prev_epos.bh);
648 *err = -ENOSPC;
649 return NULL;
650 }
651 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
652 }
653
654 /* if the extent the requsted block is located in contains multiple
655 * blocks, split the extent into at most three extents. blocks prior
656 * to requested block, requested block, and blocks after requested
657 * block */
658 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
659
660 #ifdef UDF_PREALLOCATE
661 /* We preallocate blocks only for regular files. It also makes sense
662 * for directories but there's a problem when to drop the
663 * preallocation. We might use some delayed work for that but I feel
664 * it's overengineering for a filesystem like UDF. */
665 if (S_ISREG(inode->i_mode))
666 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
667 #endif
668
669 /* merge any continuous blocks in laarr */
670 udf_merge_extents(inode, laarr, &endnum);
671
672 /* write back the new extents, inserting new extents if the new number
673 * of extents is greater than the old number, and deleting extents if
674 * the new number of extents is less than the old number */
675 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
676
677 brelse(prev_epos.bh);
678
679 newblock = udf_get_pblock(inode->i_sb, newblocknum,
680 iinfo->i_location.partitionReferenceNum, 0);
681 if (!newblock)
682 return NULL;
683 *phys = newblock;
684 *err = 0;
685 *new = 1;
686 iinfo->i_next_alloc_block = block;
687 iinfo->i_next_alloc_goal = newblocknum;
688 inode->i_ctime = current_fs_time(inode->i_sb);
689
690 if (IS_SYNC(inode))
691 udf_sync_inode(inode);
692 else
693 mark_inode_dirty(inode);
694
695 return result;
696 }
697
698 static void udf_split_extents(struct inode *inode, int *c, int offset,
699 int newblocknum,
700 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
701 int *endnum)
702 {
703 unsigned long blocksize = inode->i_sb->s_blocksize;
704 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
705
706 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
707 (laarr[*c].extLength >> 30) ==
708 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
709 int curr = *c;
710 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
711 blocksize - 1) >> blocksize_bits;
712 int8_t etype = (laarr[curr].extLength >> 30);
713
714 if (blen == 1)
715 ;
716 else if (!offset || blen == offset + 1) {
717 laarr[curr + 2] = laarr[curr + 1];
718 laarr[curr + 1] = laarr[curr];
719 } else {
720 laarr[curr + 3] = laarr[curr + 1];
721 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
722 }
723
724 if (offset) {
725 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
726 udf_free_blocks(inode->i_sb, inode,
727 &laarr[curr].extLocation,
728 0, offset);
729 laarr[curr].extLength =
730 EXT_NOT_RECORDED_NOT_ALLOCATED |
731 (offset << blocksize_bits);
732 laarr[curr].extLocation.logicalBlockNum = 0;
733 laarr[curr].extLocation.
734 partitionReferenceNum = 0;
735 } else
736 laarr[curr].extLength = (etype << 30) |
737 (offset << blocksize_bits);
738 curr++;
739 (*c)++;
740 (*endnum)++;
741 }
742
743 laarr[curr].extLocation.logicalBlockNum = newblocknum;
744 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
745 laarr[curr].extLocation.partitionReferenceNum =
746 UDF_I(inode)->i_location.partitionReferenceNum;
747 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
748 blocksize;
749 curr++;
750
751 if (blen != offset + 1) {
752 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
753 laarr[curr].extLocation.logicalBlockNum +=
754 offset + 1;
755 laarr[curr].extLength = (etype << 30) |
756 ((blen - (offset + 1)) << blocksize_bits);
757 curr++;
758 (*endnum)++;
759 }
760 }
761 }
762
763 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
764 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
765 int *endnum)
766 {
767 int start, length = 0, currlength = 0, i;
768
769 if (*endnum >= (c + 1)) {
770 if (!lastblock)
771 return;
772 else
773 start = c;
774 } else {
775 if ((laarr[c + 1].extLength >> 30) ==
776 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
777 start = c + 1;
778 length = currlength =
779 (((laarr[c + 1].extLength &
780 UDF_EXTENT_LENGTH_MASK) +
781 inode->i_sb->s_blocksize - 1) >>
782 inode->i_sb->s_blocksize_bits);
783 } else
784 start = c;
785 }
786
787 for (i = start + 1; i <= *endnum; i++) {
788 if (i == *endnum) {
789 if (lastblock)
790 length += UDF_DEFAULT_PREALLOC_BLOCKS;
791 } else if ((laarr[i].extLength >> 30) ==
792 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
793 length += (((laarr[i].extLength &
794 UDF_EXTENT_LENGTH_MASK) +
795 inode->i_sb->s_blocksize - 1) >>
796 inode->i_sb->s_blocksize_bits);
797 } else
798 break;
799 }
800
801 if (length) {
802 int next = laarr[start].extLocation.logicalBlockNum +
803 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
804 inode->i_sb->s_blocksize - 1) >>
805 inode->i_sb->s_blocksize_bits);
806 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
807 laarr[start].extLocation.partitionReferenceNum,
808 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
809 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
810 currlength);
811 if (numalloc) {
812 if (start == (c + 1))
813 laarr[start].extLength +=
814 (numalloc <<
815 inode->i_sb->s_blocksize_bits);
816 else {
817 memmove(&laarr[c + 2], &laarr[c + 1],
818 sizeof(struct long_ad) * (*endnum - (c + 1)));
819 (*endnum)++;
820 laarr[c + 1].extLocation.logicalBlockNum = next;
821 laarr[c + 1].extLocation.partitionReferenceNum =
822 laarr[c].extLocation.
823 partitionReferenceNum;
824 laarr[c + 1].extLength =
825 EXT_NOT_RECORDED_ALLOCATED |
826 (numalloc <<
827 inode->i_sb->s_blocksize_bits);
828 start = c + 1;
829 }
830
831 for (i = start + 1; numalloc && i < *endnum; i++) {
832 int elen = ((laarr[i].extLength &
833 UDF_EXTENT_LENGTH_MASK) +
834 inode->i_sb->s_blocksize - 1) >>
835 inode->i_sb->s_blocksize_bits;
836
837 if (elen > numalloc) {
838 laarr[i].extLength -=
839 (numalloc <<
840 inode->i_sb->s_blocksize_bits);
841 numalloc = 0;
842 } else {
843 numalloc -= elen;
844 if (*endnum > (i + 1))
845 memmove(&laarr[i],
846 &laarr[i + 1],
847 sizeof(struct long_ad) *
848 (*endnum - (i + 1)));
849 i--;
850 (*endnum)--;
851 }
852 }
853 UDF_I(inode)->i_lenExtents +=
854 numalloc << inode->i_sb->s_blocksize_bits;
855 }
856 }
857 }
858
859 static void udf_merge_extents(struct inode *inode,
860 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
861 int *endnum)
862 {
863 int i;
864 unsigned long blocksize = inode->i_sb->s_blocksize;
865 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
866
867 for (i = 0; i < (*endnum - 1); i++) {
868 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
869 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
870
871 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
872 (((li->extLength >> 30) ==
873 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
874 ((lip1->extLocation.logicalBlockNum -
875 li->extLocation.logicalBlockNum) ==
876 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
877 blocksize - 1) >> blocksize_bits)))) {
878
879 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
880 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
881 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
882 lip1->extLength = (lip1->extLength -
883 (li->extLength &
884 UDF_EXTENT_LENGTH_MASK) +
885 UDF_EXTENT_LENGTH_MASK) &
886 ~(blocksize - 1);
887 li->extLength = (li->extLength &
888 UDF_EXTENT_FLAG_MASK) +
889 (UDF_EXTENT_LENGTH_MASK + 1) -
890 blocksize;
891 lip1->extLocation.logicalBlockNum =
892 li->extLocation.logicalBlockNum +
893 ((li->extLength &
894 UDF_EXTENT_LENGTH_MASK) >>
895 blocksize_bits);
896 } else {
897 li->extLength = lip1->extLength +
898 (((li->extLength &
899 UDF_EXTENT_LENGTH_MASK) +
900 blocksize - 1) & ~(blocksize - 1));
901 if (*endnum > (i + 2))
902 memmove(&laarr[i + 1], &laarr[i + 2],
903 sizeof(struct long_ad) *
904 (*endnum - (i + 2)));
905 i--;
906 (*endnum)--;
907 }
908 } else if (((li->extLength >> 30) ==
909 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
910 ((lip1->extLength >> 30) ==
911 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
912 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
913 ((li->extLength &
914 UDF_EXTENT_LENGTH_MASK) +
915 blocksize - 1) >> blocksize_bits);
916 li->extLocation.logicalBlockNum = 0;
917 li->extLocation.partitionReferenceNum = 0;
918
919 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
920 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
921 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
922 lip1->extLength = (lip1->extLength -
923 (li->extLength &
924 UDF_EXTENT_LENGTH_MASK) +
925 UDF_EXTENT_LENGTH_MASK) &
926 ~(blocksize - 1);
927 li->extLength = (li->extLength &
928 UDF_EXTENT_FLAG_MASK) +
929 (UDF_EXTENT_LENGTH_MASK + 1) -
930 blocksize;
931 } else {
932 li->extLength = lip1->extLength +
933 (((li->extLength &
934 UDF_EXTENT_LENGTH_MASK) +
935 blocksize - 1) & ~(blocksize - 1));
936 if (*endnum > (i + 2))
937 memmove(&laarr[i + 1], &laarr[i + 2],
938 sizeof(struct long_ad) *
939 (*endnum - (i + 2)));
940 i--;
941 (*endnum)--;
942 }
943 } else if ((li->extLength >> 30) ==
944 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
945 udf_free_blocks(inode->i_sb, inode,
946 &li->extLocation, 0,
947 ((li->extLength &
948 UDF_EXTENT_LENGTH_MASK) +
949 blocksize - 1) >> blocksize_bits);
950 li->extLocation.logicalBlockNum = 0;
951 li->extLocation.partitionReferenceNum = 0;
952 li->extLength = (li->extLength &
953 UDF_EXTENT_LENGTH_MASK) |
954 EXT_NOT_RECORDED_NOT_ALLOCATED;
955 }
956 }
957 }
958
959 static void udf_update_extents(struct inode *inode,
960 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
961 int startnum, int endnum,
962 struct extent_position *epos)
963 {
964 int start = 0, i;
965 struct kernel_lb_addr tmploc;
966 uint32_t tmplen;
967
968 if (startnum > endnum) {
969 for (i = 0; i < (startnum - endnum); i++)
970 udf_delete_aext(inode, *epos, laarr[i].extLocation,
971 laarr[i].extLength);
972 } else if (startnum < endnum) {
973 for (i = 0; i < (endnum - startnum); i++) {
974 udf_insert_aext(inode, *epos, laarr[i].extLocation,
975 laarr[i].extLength);
976 udf_next_aext(inode, epos, &laarr[i].extLocation,
977 &laarr[i].extLength, 1);
978 start++;
979 }
980 }
981
982 for (i = start; i < endnum; i++) {
983 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
984 udf_write_aext(inode, epos, &laarr[i].extLocation,
985 laarr[i].extLength, 1);
986 }
987 }
988
989 struct buffer_head *udf_bread(struct inode *inode, int block,
990 int create, int *err)
991 {
992 struct buffer_head *bh = NULL;
993
994 bh = udf_getblk(inode, block, create, err);
995 if (!bh)
996 return NULL;
997
998 if (buffer_uptodate(bh))
999 return bh;
1000
1001 ll_rw_block(READ, 1, &bh);
1002
1003 wait_on_buffer(bh);
1004 if (buffer_uptodate(bh))
1005 return bh;
1006
1007 brelse(bh);
1008 *err = -EIO;
1009 return NULL;
1010 }
1011
1012 void udf_truncate(struct inode *inode)
1013 {
1014 int offset;
1015 int err;
1016 struct udf_inode_info *iinfo;
1017
1018 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1019 S_ISLNK(inode->i_mode)))
1020 return;
1021 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1022 return;
1023
1024 lock_kernel();
1025 iinfo = UDF_I(inode);
1026 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1027 if (inode->i_sb->s_blocksize <
1028 (udf_file_entry_alloc_offset(inode) +
1029 inode->i_size)) {
1030 udf_expand_file_adinicb(inode, inode->i_size, &err);
1031 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1032 inode->i_size = iinfo->i_lenAlloc;
1033 unlock_kernel();
1034 return;
1035 } else
1036 udf_truncate_extents(inode);
1037 } else {
1038 offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1039 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1040 0x00, inode->i_sb->s_blocksize -
1041 offset - udf_file_entry_alloc_offset(inode));
1042 iinfo->i_lenAlloc = inode->i_size;
1043 }
1044 } else {
1045 block_truncate_page(inode->i_mapping, inode->i_size,
1046 udf_get_block);
1047 udf_truncate_extents(inode);
1048 }
1049
1050 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1051 if (IS_SYNC(inode))
1052 udf_sync_inode(inode);
1053 else
1054 mark_inode_dirty(inode);
1055 unlock_kernel();
1056 }
1057
1058 static void __udf_read_inode(struct inode *inode)
1059 {
1060 struct buffer_head *bh = NULL;
1061 struct fileEntry *fe;
1062 uint16_t ident;
1063 struct udf_inode_info *iinfo = UDF_I(inode);
1064
1065 /*
1066 * Set defaults, but the inode is still incomplete!
1067 * Note: get_new_inode() sets the following on a new inode:
1068 * i_sb = sb
1069 * i_no = ino
1070 * i_flags = sb->s_flags
1071 * i_state = 0
1072 * clean_inode(): zero fills and sets
1073 * i_count = 1
1074 * i_nlink = 1
1075 * i_op = NULL;
1076 */
1077 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1078 if (!bh) {
1079 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1080 inode->i_ino);
1081 make_bad_inode(inode);
1082 return;
1083 }
1084
1085 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1086 ident != TAG_IDENT_USE) {
1087 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1088 "failed ident=%d\n", inode->i_ino, ident);
1089 brelse(bh);
1090 make_bad_inode(inode);
1091 return;
1092 }
1093
1094 fe = (struct fileEntry *)bh->b_data;
1095
1096 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1097 struct buffer_head *ibh;
1098
1099 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1100 &ident);
1101 if (ident == TAG_IDENT_IE && ibh) {
1102 struct buffer_head *nbh = NULL;
1103 struct kernel_lb_addr loc;
1104 struct indirectEntry *ie;
1105
1106 ie = (struct indirectEntry *)ibh->b_data;
1107 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1108
1109 if (ie->indirectICB.extLength &&
1110 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1111 &ident))) {
1112 if (ident == TAG_IDENT_FE ||
1113 ident == TAG_IDENT_EFE) {
1114 memcpy(&iinfo->i_location,
1115 &loc,
1116 sizeof(struct kernel_lb_addr));
1117 brelse(bh);
1118 brelse(ibh);
1119 brelse(nbh);
1120 __udf_read_inode(inode);
1121 return;
1122 }
1123 brelse(nbh);
1124 }
1125 }
1126 brelse(ibh);
1127 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1128 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1129 le16_to_cpu(fe->icbTag.strategyType));
1130 brelse(bh);
1131 make_bad_inode(inode);
1132 return;
1133 }
1134 udf_fill_inode(inode, bh);
1135
1136 brelse(bh);
1137 }
1138
1139 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1140 {
1141 struct fileEntry *fe;
1142 struct extendedFileEntry *efe;
1143 int offset;
1144 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1145 struct udf_inode_info *iinfo = UDF_I(inode);
1146
1147 fe = (struct fileEntry *)bh->b_data;
1148 efe = (struct extendedFileEntry *)bh->b_data;
1149
1150 if (fe->icbTag.strategyType == cpu_to_le16(4))
1151 iinfo->i_strat4096 = 0;
1152 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1153 iinfo->i_strat4096 = 1;
1154
1155 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1156 ICBTAG_FLAG_AD_MASK;
1157 iinfo->i_unique = 0;
1158 iinfo->i_lenEAttr = 0;
1159 iinfo->i_lenExtents = 0;
1160 iinfo->i_lenAlloc = 0;
1161 iinfo->i_next_alloc_block = 0;
1162 iinfo->i_next_alloc_goal = 0;
1163 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1164 iinfo->i_efe = 1;
1165 iinfo->i_use = 0;
1166 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1167 sizeof(struct extendedFileEntry))) {
1168 make_bad_inode(inode);
1169 return;
1170 }
1171 memcpy(iinfo->i_ext.i_data,
1172 bh->b_data + sizeof(struct extendedFileEntry),
1173 inode->i_sb->s_blocksize -
1174 sizeof(struct extendedFileEntry));
1175 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1176 iinfo->i_efe = 0;
1177 iinfo->i_use = 0;
1178 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1179 sizeof(struct fileEntry))) {
1180 make_bad_inode(inode);
1181 return;
1182 }
1183 memcpy(iinfo->i_ext.i_data,
1184 bh->b_data + sizeof(struct fileEntry),
1185 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1186 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1187 iinfo->i_efe = 0;
1188 iinfo->i_use = 1;
1189 iinfo->i_lenAlloc = le32_to_cpu(
1190 ((struct unallocSpaceEntry *)bh->b_data)->
1191 lengthAllocDescs);
1192 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1193 sizeof(struct unallocSpaceEntry))) {
1194 make_bad_inode(inode);
1195 return;
1196 }
1197 memcpy(iinfo->i_ext.i_data,
1198 bh->b_data + sizeof(struct unallocSpaceEntry),
1199 inode->i_sb->s_blocksize -
1200 sizeof(struct unallocSpaceEntry));
1201 return;
1202 }
1203
1204 read_lock(&sbi->s_cred_lock);
1205 inode->i_uid = le32_to_cpu(fe->uid);
1206 if (inode->i_uid == -1 ||
1207 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1208 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1209 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1210
1211 inode->i_gid = le32_to_cpu(fe->gid);
1212 if (inode->i_gid == -1 ||
1213 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1214 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1215 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1216
1217 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1218 sbi->s_fmode != UDF_INVALID_MODE)
1219 inode->i_mode = sbi->s_fmode;
1220 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1221 sbi->s_dmode != UDF_INVALID_MODE)
1222 inode->i_mode = sbi->s_dmode;
1223 else
1224 inode->i_mode = udf_convert_permissions(fe);
1225 inode->i_mode &= ~sbi->s_umask;
1226 read_unlock(&sbi->s_cred_lock);
1227
1228 inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1229 if (!inode->i_nlink)
1230 inode->i_nlink = 1;
1231
1232 inode->i_size = le64_to_cpu(fe->informationLength);
1233 iinfo->i_lenExtents = inode->i_size;
1234
1235 if (iinfo->i_efe == 0) {
1236 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1237 (inode->i_sb->s_blocksize_bits - 9);
1238
1239 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1240 inode->i_atime = sbi->s_record_time;
1241
1242 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1243 fe->modificationTime))
1244 inode->i_mtime = sbi->s_record_time;
1245
1246 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1247 inode->i_ctime = sbi->s_record_time;
1248
1249 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1250 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1251 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1252 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1253 } else {
1254 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1255 (inode->i_sb->s_blocksize_bits - 9);
1256
1257 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1258 inode->i_atime = sbi->s_record_time;
1259
1260 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1261 efe->modificationTime))
1262 inode->i_mtime = sbi->s_record_time;
1263
1264 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1265 iinfo->i_crtime = sbi->s_record_time;
1266
1267 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1268 inode->i_ctime = sbi->s_record_time;
1269
1270 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1271 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1272 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1273 offset = sizeof(struct extendedFileEntry) +
1274 iinfo->i_lenEAttr;
1275 }
1276
1277 switch (fe->icbTag.fileType) {
1278 case ICBTAG_FILE_TYPE_DIRECTORY:
1279 inode->i_op = &udf_dir_inode_operations;
1280 inode->i_fop = &udf_dir_operations;
1281 inode->i_mode |= S_IFDIR;
1282 inc_nlink(inode);
1283 break;
1284 case ICBTAG_FILE_TYPE_REALTIME:
1285 case ICBTAG_FILE_TYPE_REGULAR:
1286 case ICBTAG_FILE_TYPE_UNDEF:
1287 case ICBTAG_FILE_TYPE_VAT20:
1288 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1289 inode->i_data.a_ops = &udf_adinicb_aops;
1290 else
1291 inode->i_data.a_ops = &udf_aops;
1292 inode->i_op = &udf_file_inode_operations;
1293 inode->i_fop = &udf_file_operations;
1294 inode->i_mode |= S_IFREG;
1295 break;
1296 case ICBTAG_FILE_TYPE_BLOCK:
1297 inode->i_mode |= S_IFBLK;
1298 break;
1299 case ICBTAG_FILE_TYPE_CHAR:
1300 inode->i_mode |= S_IFCHR;
1301 break;
1302 case ICBTAG_FILE_TYPE_FIFO:
1303 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1304 break;
1305 case ICBTAG_FILE_TYPE_SOCKET:
1306 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1307 break;
1308 case ICBTAG_FILE_TYPE_SYMLINK:
1309 inode->i_data.a_ops = &udf_symlink_aops;
1310 inode->i_op = &udf_symlink_inode_operations;
1311 inode->i_mode = S_IFLNK | S_IRWXUGO;
1312 break;
1313 case ICBTAG_FILE_TYPE_MAIN:
1314 udf_debug("METADATA FILE-----\n");
1315 break;
1316 case ICBTAG_FILE_TYPE_MIRROR:
1317 udf_debug("METADATA MIRROR FILE-----\n");
1318 break;
1319 case ICBTAG_FILE_TYPE_BITMAP:
1320 udf_debug("METADATA BITMAP FILE-----\n");
1321 break;
1322 default:
1323 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1324 "file type=%d\n", inode->i_ino,
1325 fe->icbTag.fileType);
1326 make_bad_inode(inode);
1327 return;
1328 }
1329 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1330 struct deviceSpec *dsea =
1331 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1332 if (dsea) {
1333 init_special_inode(inode, inode->i_mode,
1334 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1335 le32_to_cpu(dsea->minorDeviceIdent)));
1336 /* Developer ID ??? */
1337 } else
1338 make_bad_inode(inode);
1339 }
1340 }
1341
1342 static int udf_alloc_i_data(struct inode *inode, size_t size)
1343 {
1344 struct udf_inode_info *iinfo = UDF_I(inode);
1345 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1346
1347 if (!iinfo->i_ext.i_data) {
1348 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1349 "no free memory\n", inode->i_ino);
1350 return -ENOMEM;
1351 }
1352
1353 return 0;
1354 }
1355
1356 static mode_t udf_convert_permissions(struct fileEntry *fe)
1357 {
1358 mode_t mode;
1359 uint32_t permissions;
1360 uint32_t flags;
1361
1362 permissions = le32_to_cpu(fe->permissions);
1363 flags = le16_to_cpu(fe->icbTag.flags);
1364
1365 mode = ((permissions) & S_IRWXO) |
1366 ((permissions >> 2) & S_IRWXG) |
1367 ((permissions >> 4) & S_IRWXU) |
1368 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1369 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1370 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1371
1372 return mode;
1373 }
1374
1375 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1376 {
1377 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1378 }
1379
1380 static int udf_sync_inode(struct inode *inode)
1381 {
1382 return udf_update_inode(inode, 1);
1383 }
1384
1385 static int udf_update_inode(struct inode *inode, int do_sync)
1386 {
1387 struct buffer_head *bh = NULL;
1388 struct fileEntry *fe;
1389 struct extendedFileEntry *efe;
1390 uint32_t udfperms;
1391 uint16_t icbflags;
1392 uint16_t crclen;
1393 int err = 0;
1394 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1395 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1396 struct udf_inode_info *iinfo = UDF_I(inode);
1397
1398 bh = udf_tgetblk(inode->i_sb,
1399 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1400 if (!bh) {
1401 udf_debug("getblk failure\n");
1402 return -ENOMEM;
1403 }
1404
1405 lock_buffer(bh);
1406 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1407 fe = (struct fileEntry *)bh->b_data;
1408 efe = (struct extendedFileEntry *)bh->b_data;
1409
1410 if (iinfo->i_use) {
1411 struct unallocSpaceEntry *use =
1412 (struct unallocSpaceEntry *)bh->b_data;
1413
1414 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1415 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1416 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1417 sizeof(struct unallocSpaceEntry));
1418 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1419 use->descTag.tagLocation =
1420 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1421 crclen = sizeof(struct unallocSpaceEntry) +
1422 iinfo->i_lenAlloc - sizeof(struct tag);
1423 use->descTag.descCRCLength = cpu_to_le16(crclen);
1424 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1425 sizeof(struct tag),
1426 crclen));
1427 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1428
1429 goto out;
1430 }
1431
1432 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1433 fe->uid = cpu_to_le32(-1);
1434 else
1435 fe->uid = cpu_to_le32(inode->i_uid);
1436
1437 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1438 fe->gid = cpu_to_le32(-1);
1439 else
1440 fe->gid = cpu_to_le32(inode->i_gid);
1441
1442 udfperms = ((inode->i_mode & S_IRWXO)) |
1443 ((inode->i_mode & S_IRWXG) << 2) |
1444 ((inode->i_mode & S_IRWXU) << 4);
1445
1446 udfperms |= (le32_to_cpu(fe->permissions) &
1447 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1448 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1449 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1450 fe->permissions = cpu_to_le32(udfperms);
1451
1452 if (S_ISDIR(inode->i_mode))
1453 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1454 else
1455 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1456
1457 fe->informationLength = cpu_to_le64(inode->i_size);
1458
1459 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1460 struct regid *eid;
1461 struct deviceSpec *dsea =
1462 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1463 if (!dsea) {
1464 dsea = (struct deviceSpec *)
1465 udf_add_extendedattr(inode,
1466 sizeof(struct deviceSpec) +
1467 sizeof(struct regid), 12, 0x3);
1468 dsea->attrType = cpu_to_le32(12);
1469 dsea->attrSubtype = 1;
1470 dsea->attrLength = cpu_to_le32(
1471 sizeof(struct deviceSpec) +
1472 sizeof(struct regid));
1473 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1474 }
1475 eid = (struct regid *)dsea->impUse;
1476 memset(eid, 0, sizeof(struct regid));
1477 strcpy(eid->ident, UDF_ID_DEVELOPER);
1478 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1479 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1480 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1481 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1482 }
1483
1484 if (iinfo->i_efe == 0) {
1485 memcpy(bh->b_data + sizeof(struct fileEntry),
1486 iinfo->i_ext.i_data,
1487 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1488 fe->logicalBlocksRecorded = cpu_to_le64(
1489 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1490 (blocksize_bits - 9));
1491
1492 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1493 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1494 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1495 memset(&(fe->impIdent), 0, sizeof(struct regid));
1496 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1497 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1498 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1499 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1500 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1501 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1502 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1503 crclen = sizeof(struct fileEntry);
1504 } else {
1505 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1506 iinfo->i_ext.i_data,
1507 inode->i_sb->s_blocksize -
1508 sizeof(struct extendedFileEntry));
1509 efe->objectSize = cpu_to_le64(inode->i_size);
1510 efe->logicalBlocksRecorded = cpu_to_le64(
1511 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1512 (blocksize_bits - 9));
1513
1514 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1515 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1516 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1517 iinfo->i_crtime = inode->i_atime;
1518
1519 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1520 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1521 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1522 iinfo->i_crtime = inode->i_mtime;
1523
1524 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1525 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1526 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1527 iinfo->i_crtime = inode->i_ctime;
1528
1529 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1530 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1531 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1532 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1533
1534 memset(&(efe->impIdent), 0, sizeof(struct regid));
1535 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1536 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1537 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1538 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1539 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1540 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1541 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1542 crclen = sizeof(struct extendedFileEntry);
1543 }
1544 if (iinfo->i_strat4096) {
1545 fe->icbTag.strategyType = cpu_to_le16(4096);
1546 fe->icbTag.strategyParameter = cpu_to_le16(1);
1547 fe->icbTag.numEntries = cpu_to_le16(2);
1548 } else {
1549 fe->icbTag.strategyType = cpu_to_le16(4);
1550 fe->icbTag.numEntries = cpu_to_le16(1);
1551 }
1552
1553 if (S_ISDIR(inode->i_mode))
1554 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1555 else if (S_ISREG(inode->i_mode))
1556 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1557 else if (S_ISLNK(inode->i_mode))
1558 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1559 else if (S_ISBLK(inode->i_mode))
1560 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1561 else if (S_ISCHR(inode->i_mode))
1562 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1563 else if (S_ISFIFO(inode->i_mode))
1564 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1565 else if (S_ISSOCK(inode->i_mode))
1566 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1567
1568 icbflags = iinfo->i_alloc_type |
1569 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1570 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1571 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1572 (le16_to_cpu(fe->icbTag.flags) &
1573 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1574 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1575
1576 fe->icbTag.flags = cpu_to_le16(icbflags);
1577 if (sbi->s_udfrev >= 0x0200)
1578 fe->descTag.descVersion = cpu_to_le16(3);
1579 else
1580 fe->descTag.descVersion = cpu_to_le16(2);
1581 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1582 fe->descTag.tagLocation = cpu_to_le32(
1583 iinfo->i_location.logicalBlockNum);
1584 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1585 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1586 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1587 crclen));
1588 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1589
1590 out:
1591 set_buffer_uptodate(bh);
1592 unlock_buffer(bh);
1593
1594 /* write the data blocks */
1595 mark_buffer_dirty(bh);
1596 if (do_sync) {
1597 sync_dirty_buffer(bh);
1598 if (buffer_write_io_error(bh)) {
1599 printk(KERN_WARNING "IO error syncing udf inode "
1600 "[%s:%08lx]\n", inode->i_sb->s_id,
1601 inode->i_ino);
1602 err = -EIO;
1603 }
1604 }
1605 brelse(bh);
1606
1607 return err;
1608 }
1609
1610 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1611 {
1612 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1613 struct inode *inode = iget_locked(sb, block);
1614
1615 if (!inode)
1616 return NULL;
1617
1618 if (inode->i_state & I_NEW) {
1619 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1620 __udf_read_inode(inode);
1621 unlock_new_inode(inode);
1622 }
1623
1624 if (is_bad_inode(inode))
1625 goto out_iput;
1626
1627 if (ino->logicalBlockNum >= UDF_SB(sb)->
1628 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1629 udf_debug("block=%d, partition=%d out of range\n",
1630 ino->logicalBlockNum, ino->partitionReferenceNum);
1631 make_bad_inode(inode);
1632 goto out_iput;
1633 }
1634
1635 return inode;
1636
1637 out_iput:
1638 iput(inode);
1639 return NULL;
1640 }
1641
1642 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1643 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1644 {
1645 int adsize;
1646 struct short_ad *sad = NULL;
1647 struct long_ad *lad = NULL;
1648 struct allocExtDesc *aed;
1649 int8_t etype;
1650 uint8_t *ptr;
1651 struct udf_inode_info *iinfo = UDF_I(inode);
1652
1653 if (!epos->bh)
1654 ptr = iinfo->i_ext.i_data + epos->offset -
1655 udf_file_entry_alloc_offset(inode) +
1656 iinfo->i_lenEAttr;
1657 else
1658 ptr = epos->bh->b_data + epos->offset;
1659
1660 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1661 adsize = sizeof(struct short_ad);
1662 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1663 adsize = sizeof(struct long_ad);
1664 else
1665 return -1;
1666
1667 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1668 unsigned char *sptr, *dptr;
1669 struct buffer_head *nbh;
1670 int err, loffset;
1671 struct kernel_lb_addr obloc = epos->block;
1672
1673 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1674 obloc.partitionReferenceNum,
1675 obloc.logicalBlockNum, &err);
1676 if (!epos->block.logicalBlockNum)
1677 return -1;
1678 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1679 &epos->block,
1680 0));
1681 if (!nbh)
1682 return -1;
1683 lock_buffer(nbh);
1684 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1685 set_buffer_uptodate(nbh);
1686 unlock_buffer(nbh);
1687 mark_buffer_dirty_inode(nbh, inode);
1688
1689 aed = (struct allocExtDesc *)(nbh->b_data);
1690 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1691 aed->previousAllocExtLocation =
1692 cpu_to_le32(obloc.logicalBlockNum);
1693 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1694 loffset = epos->offset;
1695 aed->lengthAllocDescs = cpu_to_le32(adsize);
1696 sptr = ptr - adsize;
1697 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1698 memcpy(dptr, sptr, adsize);
1699 epos->offset = sizeof(struct allocExtDesc) + adsize;
1700 } else {
1701 loffset = epos->offset + adsize;
1702 aed->lengthAllocDescs = cpu_to_le32(0);
1703 sptr = ptr;
1704 epos->offset = sizeof(struct allocExtDesc);
1705
1706 if (epos->bh) {
1707 aed = (struct allocExtDesc *)epos->bh->b_data;
1708 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1709 } else {
1710 iinfo->i_lenAlloc += adsize;
1711 mark_inode_dirty(inode);
1712 }
1713 }
1714 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1715 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1716 epos->block.logicalBlockNum, sizeof(struct tag));
1717 else
1718 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1719 epos->block.logicalBlockNum, sizeof(struct tag));
1720 switch (iinfo->i_alloc_type) {
1721 case ICBTAG_FLAG_AD_SHORT:
1722 sad = (struct short_ad *)sptr;
1723 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1724 inode->i_sb->s_blocksize);
1725 sad->extPosition =
1726 cpu_to_le32(epos->block.logicalBlockNum);
1727 break;
1728 case ICBTAG_FLAG_AD_LONG:
1729 lad = (struct long_ad *)sptr;
1730 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1731 inode->i_sb->s_blocksize);
1732 lad->extLocation = cpu_to_lelb(epos->block);
1733 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1734 break;
1735 }
1736 if (epos->bh) {
1737 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1738 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1739 udf_update_tag(epos->bh->b_data, loffset);
1740 else
1741 udf_update_tag(epos->bh->b_data,
1742 sizeof(struct allocExtDesc));
1743 mark_buffer_dirty_inode(epos->bh, inode);
1744 brelse(epos->bh);
1745 } else {
1746 mark_inode_dirty(inode);
1747 }
1748 epos->bh = nbh;
1749 }
1750
1751 etype = udf_write_aext(inode, epos, eloc, elen, inc);
1752
1753 if (!epos->bh) {
1754 iinfo->i_lenAlloc += adsize;
1755 mark_inode_dirty(inode);
1756 } else {
1757 aed = (struct allocExtDesc *)epos->bh->b_data;
1758 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1759 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1760 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1761 udf_update_tag(epos->bh->b_data,
1762 epos->offset + (inc ? 0 : adsize));
1763 else
1764 udf_update_tag(epos->bh->b_data,
1765 sizeof(struct allocExtDesc));
1766 mark_buffer_dirty_inode(epos->bh, inode);
1767 }
1768
1769 return etype;
1770 }
1771
1772 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1773 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1774 {
1775 int adsize;
1776 uint8_t *ptr;
1777 struct short_ad *sad;
1778 struct long_ad *lad;
1779 struct udf_inode_info *iinfo = UDF_I(inode);
1780
1781 if (!epos->bh)
1782 ptr = iinfo->i_ext.i_data + epos->offset -
1783 udf_file_entry_alloc_offset(inode) +
1784 iinfo->i_lenEAttr;
1785 else
1786 ptr = epos->bh->b_data + epos->offset;
1787
1788 switch (iinfo->i_alloc_type) {
1789 case ICBTAG_FLAG_AD_SHORT:
1790 sad = (struct short_ad *)ptr;
1791 sad->extLength = cpu_to_le32(elen);
1792 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1793 adsize = sizeof(struct short_ad);
1794 break;
1795 case ICBTAG_FLAG_AD_LONG:
1796 lad = (struct long_ad *)ptr;
1797 lad->extLength = cpu_to_le32(elen);
1798 lad->extLocation = cpu_to_lelb(*eloc);
1799 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1800 adsize = sizeof(struct long_ad);
1801 break;
1802 default:
1803 return -1;
1804 }
1805
1806 if (epos->bh) {
1807 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1808 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1809 struct allocExtDesc *aed =
1810 (struct allocExtDesc *)epos->bh->b_data;
1811 udf_update_tag(epos->bh->b_data,
1812 le32_to_cpu(aed->lengthAllocDescs) +
1813 sizeof(struct allocExtDesc));
1814 }
1815 mark_buffer_dirty_inode(epos->bh, inode);
1816 } else {
1817 mark_inode_dirty(inode);
1818 }
1819
1820 if (inc)
1821 epos->offset += adsize;
1822
1823 return (elen >> 30);
1824 }
1825
1826 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1827 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1828 {
1829 int8_t etype;
1830
1831 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1832 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1833 int block;
1834 epos->block = *eloc;
1835 epos->offset = sizeof(struct allocExtDesc);
1836 brelse(epos->bh);
1837 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1838 epos->bh = udf_tread(inode->i_sb, block);
1839 if (!epos->bh) {
1840 udf_debug("reading block %d failed!\n", block);
1841 return -1;
1842 }
1843 }
1844
1845 return etype;
1846 }
1847
1848 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1849 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1850 {
1851 int alen;
1852 int8_t etype;
1853 uint8_t *ptr;
1854 struct short_ad *sad;
1855 struct long_ad *lad;
1856 struct udf_inode_info *iinfo = UDF_I(inode);
1857
1858 if (!epos->bh) {
1859 if (!epos->offset)
1860 epos->offset = udf_file_entry_alloc_offset(inode);
1861 ptr = iinfo->i_ext.i_data + epos->offset -
1862 udf_file_entry_alloc_offset(inode) +
1863 iinfo->i_lenEAttr;
1864 alen = udf_file_entry_alloc_offset(inode) +
1865 iinfo->i_lenAlloc;
1866 } else {
1867 if (!epos->offset)
1868 epos->offset = sizeof(struct allocExtDesc);
1869 ptr = epos->bh->b_data + epos->offset;
1870 alen = sizeof(struct allocExtDesc) +
1871 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1872 lengthAllocDescs);
1873 }
1874
1875 switch (iinfo->i_alloc_type) {
1876 case ICBTAG_FLAG_AD_SHORT:
1877 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1878 if (!sad)
1879 return -1;
1880 etype = le32_to_cpu(sad->extLength) >> 30;
1881 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1882 eloc->partitionReferenceNum =
1883 iinfo->i_location.partitionReferenceNum;
1884 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1885 break;
1886 case ICBTAG_FLAG_AD_LONG:
1887 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1888 if (!lad)
1889 return -1;
1890 etype = le32_to_cpu(lad->extLength) >> 30;
1891 *eloc = lelb_to_cpu(lad->extLocation);
1892 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1893 break;
1894 default:
1895 udf_debug("alloc_type = %d unsupported\n",
1896 iinfo->i_alloc_type);
1897 return -1;
1898 }
1899
1900 return etype;
1901 }
1902
1903 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1904 struct kernel_lb_addr neloc, uint32_t nelen)
1905 {
1906 struct kernel_lb_addr oeloc;
1907 uint32_t oelen;
1908 int8_t etype;
1909
1910 if (epos.bh)
1911 get_bh(epos.bh);
1912
1913 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1914 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1915 neloc = oeloc;
1916 nelen = (etype << 30) | oelen;
1917 }
1918 udf_add_aext(inode, &epos, &neloc, nelen, 1);
1919 brelse(epos.bh);
1920
1921 return (nelen >> 30);
1922 }
1923
1924 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1925 struct kernel_lb_addr eloc, uint32_t elen)
1926 {
1927 struct extent_position oepos;
1928 int adsize;
1929 int8_t etype;
1930 struct allocExtDesc *aed;
1931 struct udf_inode_info *iinfo;
1932
1933 if (epos.bh) {
1934 get_bh(epos.bh);
1935 get_bh(epos.bh);
1936 }
1937
1938 iinfo = UDF_I(inode);
1939 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1940 adsize = sizeof(struct short_ad);
1941 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1942 adsize = sizeof(struct long_ad);
1943 else
1944 adsize = 0;
1945
1946 oepos = epos;
1947 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1948 return -1;
1949
1950 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1951 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
1952 if (oepos.bh != epos.bh) {
1953 oepos.block = epos.block;
1954 brelse(oepos.bh);
1955 get_bh(epos.bh);
1956 oepos.bh = epos.bh;
1957 oepos.offset = epos.offset - adsize;
1958 }
1959 }
1960 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1961 elen = 0;
1962
1963 if (epos.bh != oepos.bh) {
1964 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
1965 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1966 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1967 if (!oepos.bh) {
1968 iinfo->i_lenAlloc -= (adsize * 2);
1969 mark_inode_dirty(inode);
1970 } else {
1971 aed = (struct allocExtDesc *)oepos.bh->b_data;
1972 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1973 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1974 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1975 udf_update_tag(oepos.bh->b_data,
1976 oepos.offset - (2 * adsize));
1977 else
1978 udf_update_tag(oepos.bh->b_data,
1979 sizeof(struct allocExtDesc));
1980 mark_buffer_dirty_inode(oepos.bh, inode);
1981 }
1982 } else {
1983 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1984 if (!oepos.bh) {
1985 iinfo->i_lenAlloc -= adsize;
1986 mark_inode_dirty(inode);
1987 } else {
1988 aed = (struct allocExtDesc *)oepos.bh->b_data;
1989 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1990 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1991 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1992 udf_update_tag(oepos.bh->b_data,
1993 epos.offset - adsize);
1994 else
1995 udf_update_tag(oepos.bh->b_data,
1996 sizeof(struct allocExtDesc));
1997 mark_buffer_dirty_inode(oepos.bh, inode);
1998 }
1999 }
2000
2001 brelse(epos.bh);
2002 brelse(oepos.bh);
2003
2004 return (elen >> 30);
2005 }
2006
2007 int8_t inode_bmap(struct inode *inode, sector_t block,
2008 struct extent_position *pos, struct kernel_lb_addr *eloc,
2009 uint32_t *elen, sector_t *offset)
2010 {
2011 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2012 loff_t lbcount = 0, bcount =
2013 (loff_t) block << blocksize_bits;
2014 int8_t etype;
2015 struct udf_inode_info *iinfo;
2016
2017 iinfo = UDF_I(inode);
2018 pos->offset = 0;
2019 pos->block = iinfo->i_location;
2020 pos->bh = NULL;
2021 *elen = 0;
2022
2023 do {
2024 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2025 if (etype == -1) {
2026 *offset = (bcount - lbcount) >> blocksize_bits;
2027 iinfo->i_lenExtents = lbcount;
2028 return -1;
2029 }
2030 lbcount += *elen;
2031 } while (lbcount <= bcount);
2032
2033 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2034
2035 return etype;
2036 }
2037
2038 long udf_block_map(struct inode *inode, sector_t block)
2039 {
2040 struct kernel_lb_addr eloc;
2041 uint32_t elen;
2042 sector_t offset;
2043 struct extent_position epos = {};
2044 int ret;
2045
2046 lock_kernel();
2047
2048 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2049 (EXT_RECORDED_ALLOCATED >> 30))
2050 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2051 else
2052 ret = 0;
2053
2054 unlock_kernel();
2055 brelse(epos.bh);
2056
2057 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2058 return udf_fixed_to_variable(ret);
2059 else
2060 return ret;
2061 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree