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SHM_UNLOCK: fix Unevictable pages stranded after swap
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / inode.c
blobe2787d05fd9a96ff07309cafff6848f82a10c04c
1 /*
2 * inode.c
3 *
4 * PURPOSE
5 * Inode handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998 Dave Boynton
14 * (C) 1998-2004 Ben Fennema
15 * (C) 1999-2000 Stelias Computing Inc
16 *
17 * HISTORY
18 *
19 * 10/04/98 dgb Added rudimentary directory functions
20 * 10/07/98 Fully working udf_block_map! It works!
21 * 11/25/98 bmap altered to better support extents
22 * 12/06/98 blf partition support in udf_iget, udf_block_map
23 * and udf_read_inode
24 * 12/12/98 rewrote udf_block_map to handle next extents and descs across
25 * block boundaries (which is not actually allowed)
26 * 12/20/98 added support for strategy 4096
27 * 03/07/99 rewrote udf_block_map (again)
28 * New funcs, inode_bmap, udf_next_aext
29 * 04/19/99 Support for writing device EA's for major/minor #
30 */
31
32 #include "udfdecl.h"
33 #include <linux/mm.h>
34 #include <linux/module.h>
35 #include <linux/pagemap.h>
36 #include <linux/buffer_head.h>
37 #include <linux/writeback.h>
38 #include <linux/slab.h>
39 #include <linux/crc-itu-t.h>
40 #include <linux/mpage.h>
41
42 #include "udf_i.h"
43 #include "udf_sb.h"
44
45 MODULE_AUTHOR("Ben Fennema");
46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
47 MODULE_LICENSE("GPL");
48
49 #define EXTENT_MERGE_SIZE 5
50
51 static 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 if (!inode->i_nlink && !is_bad_inode(inode)) {
78 want_delete = 1;
79 udf_setsize(inode, 0);
80 udf_update_inode(inode, IS_SYNC(inode));
81 } else
82 truncate_inode_pages(&inode->i_data, 0);
83 invalidate_inode_buffers(inode);
84 end_writeback(inode);
85 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
86 inode->i_size != iinfo->i_lenExtents) {
87 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
88 inode->i_ino, inode->i_mode,
89 (unsigned long long)inode->i_size,
90 (unsigned long long)iinfo->i_lenExtents);
91 }
92 kfree(iinfo->i_ext.i_data);
93 iinfo->i_ext.i_data = NULL;
94 if (want_delete) {
95 udf_free_inode(inode);
96 }
97 }
98
99 static int udf_writepage(struct page *page, struct writeback_control *wbc)
100 {
101 return block_write_full_page(page, udf_get_block, wbc);
102 }
103
104 static int udf_readpage(struct file *file, struct page *page)
105 {
106 return mpage_readpage(page, udf_get_block);
107 }
108
109 static int udf_readpages(struct file *file, struct address_space *mapping,
110 struct list_head *pages, unsigned nr_pages)
111 {
112 return mpage_readpages(mapping, pages, nr_pages, 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 struct inode *inode = mapping->host;
124 struct udf_inode_info *iinfo = UDF_I(inode);
125 loff_t isize = inode->i_size;
126
127 if (pos + len > isize) {
128 truncate_pagecache(inode, pos + len, isize);
129 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
130 down_write(&iinfo->i_data_sem);
131 udf_truncate_extents(inode);
132 up_write(&iinfo->i_data_sem);
133 }
134 }
135 }
136
137 return ret;
138 }
139
140 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
141 {
142 return generic_block_bmap(mapping, block, udf_get_block);
143 }
144
145 const struct address_space_operations udf_aops = {
146 .readpage = udf_readpage,
147 .readpages = udf_readpages,
148 .writepage = udf_writepage,
149 .write_begin = udf_write_begin,
150 .write_end = generic_write_end,
151 .bmap = udf_bmap,
152 };
153
154 /*
155 * Expand file stored in ICB to a normal one-block-file
156 *
157 * This function requires i_data_sem for writing and releases it.
158 * This function requires i_mutex held
159 */
160 int udf_expand_file_adinicb(struct inode *inode)
161 {
162 struct page *page;
163 char *kaddr;
164 struct udf_inode_info *iinfo = UDF_I(inode);
165 int err;
166 struct writeback_control udf_wbc = {
167 .sync_mode = WB_SYNC_NONE,
168 .nr_to_write = 1,
169 };
170
171 if (!iinfo->i_lenAlloc) {
172 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
173 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
174 else
175 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
176 /* from now on we have normal address_space methods */
177 inode->i_data.a_ops = &udf_aops;
178 up_write(&iinfo->i_data_sem);
179 mark_inode_dirty(inode);
180 return 0;
181 }
182 /*
183 * Release i_data_sem so that we can lock a page - page lock ranks
184 * above i_data_sem. i_mutex still protects us against file changes.
185 */
186 up_write(&iinfo->i_data_sem);
187
188 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
189 if (!page)
190 return -ENOMEM;
191
192 if (!PageUptodate(page)) {
193 kaddr = kmap(page);
194 memset(kaddr + iinfo->i_lenAlloc, 0x00,
195 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
196 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
197 iinfo->i_lenAlloc);
198 flush_dcache_page(page);
199 SetPageUptodate(page);
200 kunmap(page);
201 }
202 down_write(&iinfo->i_data_sem);
203 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
204 iinfo->i_lenAlloc);
205 iinfo->i_lenAlloc = 0;
206 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
207 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
208 else
209 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
210 /* from now on we have normal address_space methods */
211 inode->i_data.a_ops = &udf_aops;
212 up_write(&iinfo->i_data_sem);
213 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
214 if (err) {
215 /* Restore everything back so that we don't lose data... */
216 lock_page(page);
217 kaddr = kmap(page);
218 down_write(&iinfo->i_data_sem);
219 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
220 inode->i_size);
221 kunmap(page);
222 unlock_page(page);
223 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
224 inode->i_data.a_ops = &udf_adinicb_aops;
225 up_write(&iinfo->i_data_sem);
226 }
227 page_cache_release(page);
228 mark_inode_dirty(inode);
229
230 return err;
231 }
232
233 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
234 int *err)
235 {
236 int newblock;
237 struct buffer_head *dbh = NULL;
238 struct kernel_lb_addr eloc;
239 uint8_t alloctype;
240 struct extent_position epos;
241
242 struct udf_fileident_bh sfibh, dfibh;
243 loff_t f_pos = udf_ext0_offset(inode);
244 int size = udf_ext0_offset(inode) + inode->i_size;
245 struct fileIdentDesc cfi, *sfi, *dfi;
246 struct udf_inode_info *iinfo = UDF_I(inode);
247
248 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
249 alloctype = ICBTAG_FLAG_AD_SHORT;
250 else
251 alloctype = ICBTAG_FLAG_AD_LONG;
252
253 if (!inode->i_size) {
254 iinfo->i_alloc_type = alloctype;
255 mark_inode_dirty(inode);
256 return NULL;
257 }
258
259 /* alloc block, and copy data to it */
260 *block = udf_new_block(inode->i_sb, inode,
261 iinfo->i_location.partitionReferenceNum,
262 iinfo->i_location.logicalBlockNum, err);
263 if (!(*block))
264 return NULL;
265 newblock = udf_get_pblock(inode->i_sb, *block,
266 iinfo->i_location.partitionReferenceNum,
267 0);
268 if (!newblock)
269 return NULL;
270 dbh = udf_tgetblk(inode->i_sb, newblock);
271 if (!dbh)
272 return NULL;
273 lock_buffer(dbh);
274 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
275 set_buffer_uptodate(dbh);
276 unlock_buffer(dbh);
277 mark_buffer_dirty_inode(dbh, inode);
278
279 sfibh.soffset = sfibh.eoffset =
280 f_pos & (inode->i_sb->s_blocksize - 1);
281 sfibh.sbh = sfibh.ebh = NULL;
282 dfibh.soffset = dfibh.eoffset = 0;
283 dfibh.sbh = dfibh.ebh = dbh;
284 while (f_pos < size) {
285 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
286 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
287 NULL, NULL, NULL);
288 if (!sfi) {
289 brelse(dbh);
290 return NULL;
291 }
292 iinfo->i_alloc_type = alloctype;
293 sfi->descTag.tagLocation = cpu_to_le32(*block);
294 dfibh.soffset = dfibh.eoffset;
295 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
296 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
297 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
298 sfi->fileIdent +
299 le16_to_cpu(sfi->lengthOfImpUse))) {
300 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
301 brelse(dbh);
302 return NULL;
303 }
304 }
305 mark_buffer_dirty_inode(dbh, inode);
306
307 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
308 iinfo->i_lenAlloc);
309 iinfo->i_lenAlloc = 0;
310 eloc.logicalBlockNum = *block;
311 eloc.partitionReferenceNum =
312 iinfo->i_location.partitionReferenceNum;
313 iinfo->i_lenExtents = inode->i_size;
314 epos.bh = NULL;
315 epos.block = iinfo->i_location;
316 epos.offset = udf_file_entry_alloc_offset(inode);
317 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
318 /* UniqueID stuff */
319
320 brelse(epos.bh);
321 mark_inode_dirty(inode);
322 return dbh;
323 }
324
325 static int udf_get_block(struct inode *inode, sector_t block,
326 struct buffer_head *bh_result, int create)
327 {
328 int err, new;
329 struct buffer_head *bh;
330 sector_t phys = 0;
331 struct udf_inode_info *iinfo;
332
333 if (!create) {
334 phys = udf_block_map(inode, block);
335 if (phys)
336 map_bh(bh_result, inode->i_sb, phys);
337 return 0;
338 }
339
340 err = -EIO;
341 new = 0;
342 bh = NULL;
343 iinfo = UDF_I(inode);
344
345 down_write(&iinfo->i_data_sem);
346 if (block == iinfo->i_next_alloc_block + 1) {
347 iinfo->i_next_alloc_block++;
348 iinfo->i_next_alloc_goal++;
349 }
350
351 err = 0;
352
353 bh = inode_getblk(inode, block, &err, &phys, &new);
354 BUG_ON(bh);
355 if (err)
356 goto abort;
357 BUG_ON(!phys);
358
359 if (new)
360 set_buffer_new(bh_result);
361 map_bh(bh_result, inode->i_sb, phys);
362
363 abort:
364 up_write(&iinfo->i_data_sem);
365 return err;
366 }
367
368 static struct buffer_head *udf_getblk(struct inode *inode, long block,
369 int create, int *err)
370 {
371 struct buffer_head *bh;
372 struct buffer_head dummy;
373
374 dummy.b_state = 0;
375 dummy.b_blocknr = -1000;
376 *err = udf_get_block(inode, block, &dummy, create);
377 if (!*err && buffer_mapped(&dummy)) {
378 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
379 if (buffer_new(&dummy)) {
380 lock_buffer(bh);
381 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
382 set_buffer_uptodate(bh);
383 unlock_buffer(bh);
384 mark_buffer_dirty_inode(bh, inode);
385 }
386 return bh;
387 }
388
389 return NULL;
390 }
391
392 /* Extend the file by 'blocks' blocks, return the number of extents added */
393 static int udf_do_extend_file(struct inode *inode,
394 struct extent_position *last_pos,
395 struct kernel_long_ad *last_ext,
396 sector_t blocks)
397 {
398 sector_t add;
399 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
400 struct super_block *sb = inode->i_sb;
401 struct kernel_lb_addr prealloc_loc = {};
402 int prealloc_len = 0;
403 struct udf_inode_info *iinfo;
404 int err;
405
406 /* The previous extent is fake and we should not extend by anything
407 * - there's nothing to do... */
408 if (!blocks && fake)
409 return 0;
410
411 iinfo = UDF_I(inode);
412 /* Round the last extent up to a multiple of block size */
413 if (last_ext->extLength & (sb->s_blocksize - 1)) {
414 last_ext->extLength =
415 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
416 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
417 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
418 iinfo->i_lenExtents =
419 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
420 ~(sb->s_blocksize - 1);
421 }
422
423 /* Last extent are just preallocated blocks? */
424 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
425 EXT_NOT_RECORDED_ALLOCATED) {
426 /* Save the extent so that we can reattach it to the end */
427 prealloc_loc = last_ext->extLocation;
428 prealloc_len = last_ext->extLength;
429 /* Mark the extent as a hole */
430 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
431 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
432 last_ext->extLocation.logicalBlockNum = 0;
433 last_ext->extLocation.partitionReferenceNum = 0;
434 }
435
436 /* Can we merge with the previous extent? */
437 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
438 EXT_NOT_RECORDED_NOT_ALLOCATED) {
439 add = ((1 << 30) - sb->s_blocksize -
440 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
441 sb->s_blocksize_bits;
442 if (add > blocks)
443 add = blocks;
444 blocks -= add;
445 last_ext->extLength += add << sb->s_blocksize_bits;
446 }
447
448 if (fake) {
449 udf_add_aext(inode, last_pos, &last_ext->extLocation,
450 last_ext->extLength, 1);
451 count++;
452 } else
453 udf_write_aext(inode, last_pos, &last_ext->extLocation,
454 last_ext->extLength, 1);
455
456 /* Managed to do everything necessary? */
457 if (!blocks)
458 goto out;
459
460 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
461 last_ext->extLocation.logicalBlockNum = 0;
462 last_ext->extLocation.partitionReferenceNum = 0;
463 add = (1 << (30-sb->s_blocksize_bits)) - 1;
464 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
465 (add << sb->s_blocksize_bits);
466
467 /* Create enough extents to cover the whole hole */
468 while (blocks > add) {
469 blocks -= add;
470 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
471 last_ext->extLength, 1);
472 if (err)
473 return err;
474 count++;
475 }
476 if (blocks) {
477 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
478 (blocks << sb->s_blocksize_bits);
479 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
480 last_ext->extLength, 1);
481 if (err)
482 return err;
483 count++;
484 }
485
486 out:
487 /* Do we have some preallocated blocks saved? */
488 if (prealloc_len) {
489 err = udf_add_aext(inode, last_pos, &prealloc_loc,
490 prealloc_len, 1);
491 if (err)
492 return err;
493 last_ext->extLocation = prealloc_loc;
494 last_ext->extLength = prealloc_len;
495 count++;
496 }
497
498 /* last_pos should point to the last written extent... */
499 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
500 last_pos->offset -= sizeof(struct short_ad);
501 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
502 last_pos->offset -= sizeof(struct long_ad);
503 else
504 return -EIO;
505
506 return count;
507 }
508
509 static int udf_extend_file(struct inode *inode, loff_t newsize)
510 {
511
512 struct extent_position epos;
513 struct kernel_lb_addr eloc;
514 uint32_t elen;
515 int8_t etype;
516 struct super_block *sb = inode->i_sb;
517 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
518 int adsize;
519 struct udf_inode_info *iinfo = UDF_I(inode);
520 struct kernel_long_ad extent;
521 int err;
522
523 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
524 adsize = sizeof(struct short_ad);
525 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
526 adsize = sizeof(struct long_ad);
527 else
528 BUG();
529
530 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
531
532 /* File has extent covering the new size (could happen when extending
533 * inside a block)? */
534 if (etype != -1)
535 return 0;
536 if (newsize & (sb->s_blocksize - 1))
537 offset++;
538 /* Extended file just to the boundary of the last file block? */
539 if (offset == 0)
540 return 0;
541
542 /* Truncate is extending the file by 'offset' blocks */
543 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
544 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
545 /* File has no extents at all or has empty last
546 * indirect extent! Create a fake extent... */
547 extent.extLocation.logicalBlockNum = 0;
548 extent.extLocation.partitionReferenceNum = 0;
549 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
550 } else {
551 epos.offset -= adsize;
552 etype = udf_next_aext(inode, &epos, &extent.extLocation,
553 &extent.extLength, 0);
554 extent.extLength |= etype << 30;
555 }
556 err = udf_do_extend_file(inode, &epos, &extent, offset);
557 if (err < 0)
558 goto out;
559 err = 0;
560 iinfo->i_lenExtents = newsize;
561 out:
562 brelse(epos.bh);
563 return err;
564 }
565
566 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
567 int *err, sector_t *phys, int *new)
568 {
569 static sector_t last_block;
570 struct buffer_head *result = NULL;
571 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
572 struct extent_position prev_epos, cur_epos, next_epos;
573 int count = 0, startnum = 0, endnum = 0;
574 uint32_t elen = 0, tmpelen;
575 struct kernel_lb_addr eloc, tmpeloc;
576 int c = 1;
577 loff_t lbcount = 0, b_off = 0;
578 uint32_t newblocknum, newblock;
579 sector_t offset = 0;
580 int8_t etype;
581 struct udf_inode_info *iinfo = UDF_I(inode);
582 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
583 int lastblock = 0;
584
585 prev_epos.offset = udf_file_entry_alloc_offset(inode);
586 prev_epos.block = iinfo->i_location;
587 prev_epos.bh = NULL;
588 cur_epos = next_epos = prev_epos;
589 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
590
591 /* find the extent which contains the block we are looking for.
592 alternate between laarr[0] and laarr[1] for locations of the
593 current extent, and the previous extent */
594 do {
595 if (prev_epos.bh != cur_epos.bh) {
596 brelse(prev_epos.bh);
597 get_bh(cur_epos.bh);
598 prev_epos.bh = cur_epos.bh;
599 }
600 if (cur_epos.bh != next_epos.bh) {
601 brelse(cur_epos.bh);
602 get_bh(next_epos.bh);
603 cur_epos.bh = next_epos.bh;
604 }
605
606 lbcount += elen;
607
608 prev_epos.block = cur_epos.block;
609 cur_epos.block = next_epos.block;
610
611 prev_epos.offset = cur_epos.offset;
612 cur_epos.offset = next_epos.offset;
613
614 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
615 if (etype == -1)
616 break;
617
618 c = !c;
619
620 laarr[c].extLength = (etype << 30) | elen;
621 laarr[c].extLocation = eloc;
622
623 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
624 pgoal = eloc.logicalBlockNum +
625 ((elen + inode->i_sb->s_blocksize - 1) >>
626 inode->i_sb->s_blocksize_bits);
627
628 count++;
629 } while (lbcount + elen <= b_off);
630
631 b_off -= lbcount;
632 offset = b_off >> inode->i_sb->s_blocksize_bits;
633 /*
634 * Move prev_epos and cur_epos into indirect extent if we are at
635 * the pointer to it
636 */
637 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
638 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
639
640 /* if the extent is allocated and recorded, return the block
641 if the extent is not a multiple of the blocksize, round up */
642
643 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
644 if (elen & (inode->i_sb->s_blocksize - 1)) {
645 elen = EXT_RECORDED_ALLOCATED |
646 ((elen + inode->i_sb->s_blocksize - 1) &
647 ~(inode->i_sb->s_blocksize - 1));
648 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
649 }
650 brelse(prev_epos.bh);
651 brelse(cur_epos.bh);
652 brelse(next_epos.bh);
653 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
654 *phys = newblock;
655 return NULL;
656 }
657
658 last_block = block;
659 /* Are we beyond EOF? */
660 if (etype == -1) {
661 int ret;
662
663 if (count) {
664 if (c)
665 laarr[0] = laarr[1];
666 startnum = 1;
667 } else {
668 /* Create a fake extent when there's not one */
669 memset(&laarr[0].extLocation, 0x00,
670 sizeof(struct kernel_lb_addr));
671 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
672 /* Will udf_do_extend_file() create real extent from
673 a fake one? */
674 startnum = (offset > 0);
675 }
676 /* Create extents for the hole between EOF and offset */
677 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
678 if (ret < 0) {
679 brelse(prev_epos.bh);
680 brelse(cur_epos.bh);
681 brelse(next_epos.bh);
682 *err = ret;
683 return NULL;
684 }
685 c = 0;
686 offset = 0;
687 count += ret;
688 /* We are not covered by a preallocated extent? */
689 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
690 EXT_NOT_RECORDED_ALLOCATED) {
691 /* Is there any real extent? - otherwise we overwrite
692 * the fake one... */
693 if (count)
694 c = !c;
695 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
696 inode->i_sb->s_blocksize;
697 memset(&laarr[c].extLocation, 0x00,
698 sizeof(struct kernel_lb_addr));
699 count++;
700 endnum++;
701 }
702 endnum = c + 1;
703 lastblock = 1;
704 } else {
705 endnum = startnum = ((count > 2) ? 2 : count);
706
707 /* if the current extent is in position 0,
708 swap it with the previous */
709 if (!c && count != 1) {
710 laarr[2] = laarr[0];
711 laarr[0] = laarr[1];
712 laarr[1] = laarr[2];
713 c = 1;
714 }
715
716 /* if the current block is located in an extent,
717 read the next extent */
718 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
719 if (etype != -1) {
720 laarr[c + 1].extLength = (etype << 30) | elen;
721 laarr[c + 1].extLocation = eloc;
722 count++;
723 startnum++;
724 endnum++;
725 } else
726 lastblock = 1;
727 }
728
729 /* if the current extent is not recorded but allocated, get the
730 * block in the extent corresponding to the requested block */
731 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
732 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
733 else { /* otherwise, allocate a new block */
734 if (iinfo->i_next_alloc_block == block)
735 goal = iinfo->i_next_alloc_goal;
736
737 if (!goal) {
738 if (!(goal = pgoal)) /* XXX: what was intended here? */
739 goal = iinfo->i_location.logicalBlockNum + 1;
740 }
741
742 newblocknum = udf_new_block(inode->i_sb, inode,
743 iinfo->i_location.partitionReferenceNum,
744 goal, err);
745 if (!newblocknum) {
746 brelse(prev_epos.bh);
747 *err = -ENOSPC;
748 return NULL;
749 }
750 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
751 }
752
753 /* if the extent the requsted block is located in contains multiple
754 * blocks, split the extent into at most three extents. blocks prior
755 * to requested block, requested block, and blocks after requested
756 * block */
757 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
758
759 #ifdef UDF_PREALLOCATE
760 /* We preallocate blocks only for regular files. It also makes sense
761 * for directories but there's a problem when to drop the
762 * preallocation. We might use some delayed work for that but I feel
763 * it's overengineering for a filesystem like UDF. */
764 if (S_ISREG(inode->i_mode))
765 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
766 #endif
767
768 /* merge any continuous blocks in laarr */
769 udf_merge_extents(inode, laarr, &endnum);
770
771 /* write back the new extents, inserting new extents if the new number
772 * of extents is greater than the old number, and deleting extents if
773 * the new number of extents is less than the old number */
774 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
775
776 brelse(prev_epos.bh);
777
778 newblock = udf_get_pblock(inode->i_sb, newblocknum,
779 iinfo->i_location.partitionReferenceNum, 0);
780 if (!newblock)
781 return NULL;
782 *phys = newblock;
783 *err = 0;
784 *new = 1;
785 iinfo->i_next_alloc_block = block;
786 iinfo->i_next_alloc_goal = newblocknum;
787 inode->i_ctime = current_fs_time(inode->i_sb);
788
789 if (IS_SYNC(inode))
790 udf_sync_inode(inode);
791 else
792 mark_inode_dirty(inode);
793
794 return result;
795 }
796
797 static void udf_split_extents(struct inode *inode, int *c, int offset,
798 int newblocknum,
799 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
800 int *endnum)
801 {
802 unsigned long blocksize = inode->i_sb->s_blocksize;
803 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
804
805 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
806 (laarr[*c].extLength >> 30) ==
807 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
808 int curr = *c;
809 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
810 blocksize - 1) >> blocksize_bits;
811 int8_t etype = (laarr[curr].extLength >> 30);
812
813 if (blen == 1)
814 ;
815 else if (!offset || blen == offset + 1) {
816 laarr[curr + 2] = laarr[curr + 1];
817 laarr[curr + 1] = laarr[curr];
818 } else {
819 laarr[curr + 3] = laarr[curr + 1];
820 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
821 }
822
823 if (offset) {
824 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
825 udf_free_blocks(inode->i_sb, inode,
826 &laarr[curr].extLocation,
827 0, offset);
828 laarr[curr].extLength =
829 EXT_NOT_RECORDED_NOT_ALLOCATED |
830 (offset << blocksize_bits);
831 laarr[curr].extLocation.logicalBlockNum = 0;
832 laarr[curr].extLocation.
833 partitionReferenceNum = 0;
834 } else
835 laarr[curr].extLength = (etype << 30) |
836 (offset << blocksize_bits);
837 curr++;
838 (*c)++;
839 (*endnum)++;
840 }
841
842 laarr[curr].extLocation.logicalBlockNum = newblocknum;
843 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
844 laarr[curr].extLocation.partitionReferenceNum =
845 UDF_I(inode)->i_location.partitionReferenceNum;
846 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
847 blocksize;
848 curr++;
849
850 if (blen != offset + 1) {
851 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
852 laarr[curr].extLocation.logicalBlockNum +=
853 offset + 1;
854 laarr[curr].extLength = (etype << 30) |
855 ((blen - (offset + 1)) << blocksize_bits);
856 curr++;
857 (*endnum)++;
858 }
859 }
860 }
861
862 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
863 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
864 int *endnum)
865 {
866 int start, length = 0, currlength = 0, i;
867
868 if (*endnum >= (c + 1)) {
869 if (!lastblock)
870 return;
871 else
872 start = c;
873 } else {
874 if ((laarr[c + 1].extLength >> 30) ==
875 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
876 start = c + 1;
877 length = currlength =
878 (((laarr[c + 1].extLength &
879 UDF_EXTENT_LENGTH_MASK) +
880 inode->i_sb->s_blocksize - 1) >>
881 inode->i_sb->s_blocksize_bits);
882 } else
883 start = c;
884 }
885
886 for (i = start + 1; i <= *endnum; i++) {
887 if (i == *endnum) {
888 if (lastblock)
889 length += UDF_DEFAULT_PREALLOC_BLOCKS;
890 } else if ((laarr[i].extLength >> 30) ==
891 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
892 length += (((laarr[i].extLength &
893 UDF_EXTENT_LENGTH_MASK) +
894 inode->i_sb->s_blocksize - 1) >>
895 inode->i_sb->s_blocksize_bits);
896 } else
897 break;
898 }
899
900 if (length) {
901 int next = laarr[start].extLocation.logicalBlockNum +
902 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
903 inode->i_sb->s_blocksize - 1) >>
904 inode->i_sb->s_blocksize_bits);
905 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
906 laarr[start].extLocation.partitionReferenceNum,
907 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
908 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
909 currlength);
910 if (numalloc) {
911 if (start == (c + 1))
912 laarr[start].extLength +=
913 (numalloc <<
914 inode->i_sb->s_blocksize_bits);
915 else {
916 memmove(&laarr[c + 2], &laarr[c + 1],
917 sizeof(struct long_ad) * (*endnum - (c + 1)));
918 (*endnum)++;
919 laarr[c + 1].extLocation.logicalBlockNum = next;
920 laarr[c + 1].extLocation.partitionReferenceNum =
921 laarr[c].extLocation.
922 partitionReferenceNum;
923 laarr[c + 1].extLength =
924 EXT_NOT_RECORDED_ALLOCATED |
925 (numalloc <<
926 inode->i_sb->s_blocksize_bits);
927 start = c + 1;
928 }
929
930 for (i = start + 1; numalloc && i < *endnum; i++) {
931 int elen = ((laarr[i].extLength &
932 UDF_EXTENT_LENGTH_MASK) +
933 inode->i_sb->s_blocksize - 1) >>
934 inode->i_sb->s_blocksize_bits;
935
936 if (elen > numalloc) {
937 laarr[i].extLength -=
938 (numalloc <<
939 inode->i_sb->s_blocksize_bits);
940 numalloc = 0;
941 } else {
942 numalloc -= elen;
943 if (*endnum > (i + 1))
944 memmove(&laarr[i],
945 &laarr[i + 1],
946 sizeof(struct long_ad) *
947 (*endnum - (i + 1)));
948 i--;
949 (*endnum)--;
950 }
951 }
952 UDF_I(inode)->i_lenExtents +=
953 numalloc << inode->i_sb->s_blocksize_bits;
954 }
955 }
956 }
957
958 static void udf_merge_extents(struct inode *inode,
959 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
960 int *endnum)
961 {
962 int i;
963 unsigned long blocksize = inode->i_sb->s_blocksize;
964 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
965
966 for (i = 0; i < (*endnum - 1); i++) {
967 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
968 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
969
970 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
971 (((li->extLength >> 30) ==
972 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
973 ((lip1->extLocation.logicalBlockNum -
974 li->extLocation.logicalBlockNum) ==
975 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
976 blocksize - 1) >> blocksize_bits)))) {
977
978 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
979 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
980 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
981 lip1->extLength = (lip1->extLength -
982 (li->extLength &
983 UDF_EXTENT_LENGTH_MASK) +
984 UDF_EXTENT_LENGTH_MASK) &
985 ~(blocksize - 1);
986 li->extLength = (li->extLength &
987 UDF_EXTENT_FLAG_MASK) +
988 (UDF_EXTENT_LENGTH_MASK + 1) -
989 blocksize;
990 lip1->extLocation.logicalBlockNum =
991 li->extLocation.logicalBlockNum +
992 ((li->extLength &
993 UDF_EXTENT_LENGTH_MASK) >>
994 blocksize_bits);
995 } else {
996 li->extLength = lip1->extLength +
997 (((li->extLength &
998 UDF_EXTENT_LENGTH_MASK) +
999 blocksize - 1) & ~(blocksize - 1));
1000 if (*endnum > (i + 2))
1001 memmove(&laarr[i + 1], &laarr[i + 2],
1002 sizeof(struct long_ad) *
1003 (*endnum - (i + 2)));
1004 i--;
1005 (*endnum)--;
1006 }
1007 } else if (((li->extLength >> 30) ==
1008 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1009 ((lip1->extLength >> 30) ==
1010 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1011 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1012 ((li->extLength &
1013 UDF_EXTENT_LENGTH_MASK) +
1014 blocksize - 1) >> blocksize_bits);
1015 li->extLocation.logicalBlockNum = 0;
1016 li->extLocation.partitionReferenceNum = 0;
1017
1018 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1019 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1020 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1021 lip1->extLength = (lip1->extLength -
1022 (li->extLength &
1023 UDF_EXTENT_LENGTH_MASK) +
1024 UDF_EXTENT_LENGTH_MASK) &
1025 ~(blocksize - 1);
1026 li->extLength = (li->extLength &
1027 UDF_EXTENT_FLAG_MASK) +
1028 (UDF_EXTENT_LENGTH_MASK + 1) -
1029 blocksize;
1030 } else {
1031 li->extLength = lip1->extLength +
1032 (((li->extLength &
1033 UDF_EXTENT_LENGTH_MASK) +
1034 blocksize - 1) & ~(blocksize - 1));
1035 if (*endnum > (i + 2))
1036 memmove(&laarr[i + 1], &laarr[i + 2],
1037 sizeof(struct long_ad) *
1038 (*endnum - (i + 2)));
1039 i--;
1040 (*endnum)--;
1041 }
1042 } else if ((li->extLength >> 30) ==
1043 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1044 udf_free_blocks(inode->i_sb, inode,
1045 &li->extLocation, 0,
1046 ((li->extLength &
1047 UDF_EXTENT_LENGTH_MASK) +
1048 blocksize - 1) >> blocksize_bits);
1049 li->extLocation.logicalBlockNum = 0;
1050 li->extLocation.partitionReferenceNum = 0;
1051 li->extLength = (li->extLength &
1052 UDF_EXTENT_LENGTH_MASK) |
1053 EXT_NOT_RECORDED_NOT_ALLOCATED;
1054 }
1055 }
1056 }
1057
1058 static void udf_update_extents(struct inode *inode,
1059 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1060 int startnum, int endnum,
1061 struct extent_position *epos)
1062 {
1063 int start = 0, i;
1064 struct kernel_lb_addr tmploc;
1065 uint32_t tmplen;
1066
1067 if (startnum > endnum) {
1068 for (i = 0; i < (startnum - endnum); i++)
1069 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1070 laarr[i].extLength);
1071 } else if (startnum < endnum) {
1072 for (i = 0; i < (endnum - startnum); i++) {
1073 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1074 laarr[i].extLength);
1075 udf_next_aext(inode, epos, &laarr[i].extLocation,
1076 &laarr[i].extLength, 1);
1077 start++;
1078 }
1079 }
1080
1081 for (i = start; i < endnum; i++) {
1082 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1083 udf_write_aext(inode, epos, &laarr[i].extLocation,
1084 laarr[i].extLength, 1);
1085 }
1086 }
1087
1088 struct buffer_head *udf_bread(struct inode *inode, int block,
1089 int create, int *err)
1090 {
1091 struct buffer_head *bh = NULL;
1092
1093 bh = udf_getblk(inode, block, create, err);
1094 if (!bh)
1095 return NULL;
1096
1097 if (buffer_uptodate(bh))
1098 return bh;
1099
1100 ll_rw_block(READ, 1, &bh);
1101
1102 wait_on_buffer(bh);
1103 if (buffer_uptodate(bh))
1104 return bh;
1105
1106 brelse(bh);
1107 *err = -EIO;
1108 return NULL;
1109 }
1110
1111 int udf_setsize(struct inode *inode, loff_t newsize)
1112 {
1113 int err;
1114 struct udf_inode_info *iinfo;
1115 int bsize = 1 << inode->i_blkbits;
1116
1117 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1118 S_ISLNK(inode->i_mode)))
1119 return -EINVAL;
1120 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1121 return -EPERM;
1122
1123 iinfo = UDF_I(inode);
1124 if (newsize > inode->i_size) {
1125 down_write(&iinfo->i_data_sem);
1126 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1127 if (bsize <
1128 (udf_file_entry_alloc_offset(inode) + newsize)) {
1129 err = udf_expand_file_adinicb(inode);
1130 if (err)
1131 return err;
1132 down_write(&iinfo->i_data_sem);
1133 } else
1134 iinfo->i_lenAlloc = newsize;
1135 }
1136 err = udf_extend_file(inode, newsize);
1137 if (err) {
1138 up_write(&iinfo->i_data_sem);
1139 return err;
1140 }
1141 truncate_setsize(inode, newsize);
1142 up_write(&iinfo->i_data_sem);
1143 } else {
1144 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1145 down_write(&iinfo->i_data_sem);
1146 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1147 0x00, bsize - newsize -
1148 udf_file_entry_alloc_offset(inode));
1149 iinfo->i_lenAlloc = newsize;
1150 truncate_setsize(inode, newsize);
1151 up_write(&iinfo->i_data_sem);
1152 goto update_time;
1153 }
1154 err = block_truncate_page(inode->i_mapping, newsize,
1155 udf_get_block);
1156 if (err)
1157 return err;
1158 down_write(&iinfo->i_data_sem);
1159 truncate_setsize(inode, newsize);
1160 udf_truncate_extents(inode);
1161 up_write(&iinfo->i_data_sem);
1162 }
1163 update_time:
1164 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1165 if (IS_SYNC(inode))
1166 udf_sync_inode(inode);
1167 else
1168 mark_inode_dirty(inode);
1169 return 0;
1170 }
1171
1172 static void __udf_read_inode(struct inode *inode)
1173 {
1174 struct buffer_head *bh = NULL;
1175 struct fileEntry *fe;
1176 uint16_t ident;
1177 struct udf_inode_info *iinfo = UDF_I(inode);
1178
1179 /*
1180 * Set defaults, but the inode is still incomplete!
1181 * Note: get_new_inode() sets the following on a new inode:
1182 * i_sb = sb
1183 * i_no = ino
1184 * i_flags = sb->s_flags
1185 * i_state = 0
1186 * clean_inode(): zero fills and sets
1187 * i_count = 1
1188 * i_nlink = 1
1189 * i_op = NULL;
1190 */
1191 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1192 if (!bh) {
1193 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1194 make_bad_inode(inode);
1195 return;
1196 }
1197
1198 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1199 ident != TAG_IDENT_USE) {
1200 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1201 inode->i_ino, ident);
1202 brelse(bh);
1203 make_bad_inode(inode);
1204 return;
1205 }
1206
1207 fe = (struct fileEntry *)bh->b_data;
1208
1209 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1210 struct buffer_head *ibh;
1211
1212 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1213 &ident);
1214 if (ident == TAG_IDENT_IE && ibh) {
1215 struct buffer_head *nbh = NULL;
1216 struct kernel_lb_addr loc;
1217 struct indirectEntry *ie;
1218
1219 ie = (struct indirectEntry *)ibh->b_data;
1220 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1221
1222 if (ie->indirectICB.extLength &&
1223 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1224 &ident))) {
1225 if (ident == TAG_IDENT_FE ||
1226 ident == TAG_IDENT_EFE) {
1227 memcpy(&iinfo->i_location,
1228 &loc,
1229 sizeof(struct kernel_lb_addr));
1230 brelse(bh);
1231 brelse(ibh);
1232 brelse(nbh);
1233 __udf_read_inode(inode);
1234 return;
1235 }
1236 brelse(nbh);
1237 }
1238 }
1239 brelse(ibh);
1240 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1241 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1242 le16_to_cpu(fe->icbTag.strategyType));
1243 brelse(bh);
1244 make_bad_inode(inode);
1245 return;
1246 }
1247 udf_fill_inode(inode, bh);
1248
1249 brelse(bh);
1250 }
1251
1252 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1253 {
1254 struct fileEntry *fe;
1255 struct extendedFileEntry *efe;
1256 int offset;
1257 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1258 struct udf_inode_info *iinfo = UDF_I(inode);
1259 unsigned int link_count;
1260
1261 fe = (struct fileEntry *)bh->b_data;
1262 efe = (struct extendedFileEntry *)bh->b_data;
1263
1264 if (fe->icbTag.strategyType == cpu_to_le16(4))
1265 iinfo->i_strat4096 = 0;
1266 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1267 iinfo->i_strat4096 = 1;
1268
1269 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1270 ICBTAG_FLAG_AD_MASK;
1271 iinfo->i_unique = 0;
1272 iinfo->i_lenEAttr = 0;
1273 iinfo->i_lenExtents = 0;
1274 iinfo->i_lenAlloc = 0;
1275 iinfo->i_next_alloc_block = 0;
1276 iinfo->i_next_alloc_goal = 0;
1277 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1278 iinfo->i_efe = 1;
1279 iinfo->i_use = 0;
1280 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1281 sizeof(struct extendedFileEntry))) {
1282 make_bad_inode(inode);
1283 return;
1284 }
1285 memcpy(iinfo->i_ext.i_data,
1286 bh->b_data + sizeof(struct extendedFileEntry),
1287 inode->i_sb->s_blocksize -
1288 sizeof(struct extendedFileEntry));
1289 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1290 iinfo->i_efe = 0;
1291 iinfo->i_use = 0;
1292 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1293 sizeof(struct fileEntry))) {
1294 make_bad_inode(inode);
1295 return;
1296 }
1297 memcpy(iinfo->i_ext.i_data,
1298 bh->b_data + sizeof(struct fileEntry),
1299 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1300 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1301 iinfo->i_efe = 0;
1302 iinfo->i_use = 1;
1303 iinfo->i_lenAlloc = le32_to_cpu(
1304 ((struct unallocSpaceEntry *)bh->b_data)->
1305 lengthAllocDescs);
1306 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1307 sizeof(struct unallocSpaceEntry))) {
1308 make_bad_inode(inode);
1309 return;
1310 }
1311 memcpy(iinfo->i_ext.i_data,
1312 bh->b_data + sizeof(struct unallocSpaceEntry),
1313 inode->i_sb->s_blocksize -
1314 sizeof(struct unallocSpaceEntry));
1315 return;
1316 }
1317
1318 read_lock(&sbi->s_cred_lock);
1319 inode->i_uid = le32_to_cpu(fe->uid);
1320 if (inode->i_uid == -1 ||
1321 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1322 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1323 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1324
1325 inode->i_gid = le32_to_cpu(fe->gid);
1326 if (inode->i_gid == -1 ||
1327 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1328 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1329 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1330
1331 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1332 sbi->s_fmode != UDF_INVALID_MODE)
1333 inode->i_mode = sbi->s_fmode;
1334 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1335 sbi->s_dmode != UDF_INVALID_MODE)
1336 inode->i_mode = sbi->s_dmode;
1337 else
1338 inode->i_mode = udf_convert_permissions(fe);
1339 inode->i_mode &= ~sbi->s_umask;
1340 read_unlock(&sbi->s_cred_lock);
1341
1342 link_count = le16_to_cpu(fe->fileLinkCount);
1343 if (!link_count)
1344 link_count = 1;
1345 set_nlink(inode, link_count);
1346
1347 inode->i_size = le64_to_cpu(fe->informationLength);
1348 iinfo->i_lenExtents = inode->i_size;
1349
1350 if (iinfo->i_efe == 0) {
1351 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1352 (inode->i_sb->s_blocksize_bits - 9);
1353
1354 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1355 inode->i_atime = sbi->s_record_time;
1356
1357 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1358 fe->modificationTime))
1359 inode->i_mtime = sbi->s_record_time;
1360
1361 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1362 inode->i_ctime = sbi->s_record_time;
1363
1364 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1365 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1366 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1367 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1368 } else {
1369 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1370 (inode->i_sb->s_blocksize_bits - 9);
1371
1372 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1373 inode->i_atime = sbi->s_record_time;
1374
1375 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1376 efe->modificationTime))
1377 inode->i_mtime = sbi->s_record_time;
1378
1379 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1380 iinfo->i_crtime = sbi->s_record_time;
1381
1382 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1383 inode->i_ctime = sbi->s_record_time;
1384
1385 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1386 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1387 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1388 offset = sizeof(struct extendedFileEntry) +
1389 iinfo->i_lenEAttr;
1390 }
1391
1392 switch (fe->icbTag.fileType) {
1393 case ICBTAG_FILE_TYPE_DIRECTORY:
1394 inode->i_op = &udf_dir_inode_operations;
1395 inode->i_fop = &udf_dir_operations;
1396 inode->i_mode |= S_IFDIR;
1397 inc_nlink(inode);
1398 break;
1399 case ICBTAG_FILE_TYPE_REALTIME:
1400 case ICBTAG_FILE_TYPE_REGULAR:
1401 case ICBTAG_FILE_TYPE_UNDEF:
1402 case ICBTAG_FILE_TYPE_VAT20:
1403 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1404 inode->i_data.a_ops = &udf_adinicb_aops;
1405 else
1406 inode->i_data.a_ops = &udf_aops;
1407 inode->i_op = &udf_file_inode_operations;
1408 inode->i_fop = &udf_file_operations;
1409 inode->i_mode |= S_IFREG;
1410 break;
1411 case ICBTAG_FILE_TYPE_BLOCK:
1412 inode->i_mode |= S_IFBLK;
1413 break;
1414 case ICBTAG_FILE_TYPE_CHAR:
1415 inode->i_mode |= S_IFCHR;
1416 break;
1417 case ICBTAG_FILE_TYPE_FIFO:
1418 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1419 break;
1420 case ICBTAG_FILE_TYPE_SOCKET:
1421 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1422 break;
1423 case ICBTAG_FILE_TYPE_SYMLINK:
1424 inode->i_data.a_ops = &udf_symlink_aops;
1425 inode->i_op = &udf_symlink_inode_operations;
1426 inode->i_mode = S_IFLNK | S_IRWXUGO;
1427 break;
1428 case ICBTAG_FILE_TYPE_MAIN:
1429 udf_debug("METADATA FILE-----\n");
1430 break;
1431 case ICBTAG_FILE_TYPE_MIRROR:
1432 udf_debug("METADATA MIRROR FILE-----\n");
1433 break;
1434 case ICBTAG_FILE_TYPE_BITMAP:
1435 udf_debug("METADATA BITMAP FILE-----\n");
1436 break;
1437 default:
1438 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1439 inode->i_ino, fe->icbTag.fileType);
1440 make_bad_inode(inode);
1441 return;
1442 }
1443 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1444 struct deviceSpec *dsea =
1445 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1446 if (dsea) {
1447 init_special_inode(inode, inode->i_mode,
1448 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1449 le32_to_cpu(dsea->minorDeviceIdent)));
1450 /* Developer ID ??? */
1451 } else
1452 make_bad_inode(inode);
1453 }
1454 }
1455
1456 static int udf_alloc_i_data(struct inode *inode, size_t size)
1457 {
1458 struct udf_inode_info *iinfo = UDF_I(inode);
1459 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1460
1461 if (!iinfo->i_ext.i_data) {
1462 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1463 inode->i_ino);
1464 return -ENOMEM;
1465 }
1466
1467 return 0;
1468 }
1469
1470 static mode_t udf_convert_permissions(struct fileEntry *fe)
1471 {
1472 mode_t mode;
1473 uint32_t permissions;
1474 uint32_t flags;
1475
1476 permissions = le32_to_cpu(fe->permissions);
1477 flags = le16_to_cpu(fe->icbTag.flags);
1478
1479 mode = ((permissions) & S_IRWXO) |
1480 ((permissions >> 2) & S_IRWXG) |
1481 ((permissions >> 4) & S_IRWXU) |
1482 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1483 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1484 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1485
1486 return mode;
1487 }
1488
1489 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1490 {
1491 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1492 }
1493
1494 static int udf_sync_inode(struct inode *inode)
1495 {
1496 return udf_update_inode(inode, 1);
1497 }
1498
1499 static int udf_update_inode(struct inode *inode, int do_sync)
1500 {
1501 struct buffer_head *bh = NULL;
1502 struct fileEntry *fe;
1503 struct extendedFileEntry *efe;
1504 uint32_t udfperms;
1505 uint16_t icbflags;
1506 uint16_t crclen;
1507 int err = 0;
1508 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1509 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1510 struct udf_inode_info *iinfo = UDF_I(inode);
1511
1512 bh = udf_tgetblk(inode->i_sb,
1513 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1514 if (!bh) {
1515 udf_debug("getblk failure\n");
1516 return -ENOMEM;
1517 }
1518
1519 lock_buffer(bh);
1520 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1521 fe = (struct fileEntry *)bh->b_data;
1522 efe = (struct extendedFileEntry *)bh->b_data;
1523
1524 if (iinfo->i_use) {
1525 struct unallocSpaceEntry *use =
1526 (struct unallocSpaceEntry *)bh->b_data;
1527
1528 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1529 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1530 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1531 sizeof(struct unallocSpaceEntry));
1532 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1533 use->descTag.tagLocation =
1534 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1535 crclen = sizeof(struct unallocSpaceEntry) +
1536 iinfo->i_lenAlloc - sizeof(struct tag);
1537 use->descTag.descCRCLength = cpu_to_le16(crclen);
1538 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1539 sizeof(struct tag),
1540 crclen));
1541 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1542
1543 goto out;
1544 }
1545
1546 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1547 fe->uid = cpu_to_le32(-1);
1548 else
1549 fe->uid = cpu_to_le32(inode->i_uid);
1550
1551 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1552 fe->gid = cpu_to_le32(-1);
1553 else
1554 fe->gid = cpu_to_le32(inode->i_gid);
1555
1556 udfperms = ((inode->i_mode & S_IRWXO)) |
1557 ((inode->i_mode & S_IRWXG) << 2) |
1558 ((inode->i_mode & S_IRWXU) << 4);
1559
1560 udfperms |= (le32_to_cpu(fe->permissions) &
1561 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1562 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1563 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1564 fe->permissions = cpu_to_le32(udfperms);
1565
1566 if (S_ISDIR(inode->i_mode))
1567 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1568 else
1569 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1570
1571 fe->informationLength = cpu_to_le64(inode->i_size);
1572
1573 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1574 struct regid *eid;
1575 struct deviceSpec *dsea =
1576 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1577 if (!dsea) {
1578 dsea = (struct deviceSpec *)
1579 udf_add_extendedattr(inode,
1580 sizeof(struct deviceSpec) +
1581 sizeof(struct regid), 12, 0x3);
1582 dsea->attrType = cpu_to_le32(12);
1583 dsea->attrSubtype = 1;
1584 dsea->attrLength = cpu_to_le32(
1585 sizeof(struct deviceSpec) +
1586 sizeof(struct regid));
1587 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1588 }
1589 eid = (struct regid *)dsea->impUse;
1590 memset(eid, 0, sizeof(struct regid));
1591 strcpy(eid->ident, UDF_ID_DEVELOPER);
1592 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1593 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1594 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1595 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1596 }
1597
1598 if (iinfo->i_efe == 0) {
1599 memcpy(bh->b_data + sizeof(struct fileEntry),
1600 iinfo->i_ext.i_data,
1601 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1602 fe->logicalBlocksRecorded = cpu_to_le64(
1603 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1604 (blocksize_bits - 9));
1605
1606 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1607 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1608 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1609 memset(&(fe->impIdent), 0, sizeof(struct regid));
1610 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1611 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1612 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1613 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1614 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1615 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1616 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1617 crclen = sizeof(struct fileEntry);
1618 } else {
1619 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1620 iinfo->i_ext.i_data,
1621 inode->i_sb->s_blocksize -
1622 sizeof(struct extendedFileEntry));
1623 efe->objectSize = cpu_to_le64(inode->i_size);
1624 efe->logicalBlocksRecorded = cpu_to_le64(
1625 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1626 (blocksize_bits - 9));
1627
1628 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1629 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1630 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1631 iinfo->i_crtime = inode->i_atime;
1632
1633 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1634 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1635 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1636 iinfo->i_crtime = inode->i_mtime;
1637
1638 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1639 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1640 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1641 iinfo->i_crtime = inode->i_ctime;
1642
1643 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1644 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1645 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1646 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1647
1648 memset(&(efe->impIdent), 0, sizeof(struct regid));
1649 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1650 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1651 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1652 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1653 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1654 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1655 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1656 crclen = sizeof(struct extendedFileEntry);
1657 }
1658 if (iinfo->i_strat4096) {
1659 fe->icbTag.strategyType = cpu_to_le16(4096);
1660 fe->icbTag.strategyParameter = cpu_to_le16(1);
1661 fe->icbTag.numEntries = cpu_to_le16(2);
1662 } else {
1663 fe->icbTag.strategyType = cpu_to_le16(4);
1664 fe->icbTag.numEntries = cpu_to_le16(1);
1665 }
1666
1667 if (S_ISDIR(inode->i_mode))
1668 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1669 else if (S_ISREG(inode->i_mode))
1670 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1671 else if (S_ISLNK(inode->i_mode))
1672 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1673 else if (S_ISBLK(inode->i_mode))
1674 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1675 else if (S_ISCHR(inode->i_mode))
1676 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1677 else if (S_ISFIFO(inode->i_mode))
1678 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1679 else if (S_ISSOCK(inode->i_mode))
1680 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1681
1682 icbflags = iinfo->i_alloc_type |
1683 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1684 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1685 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1686 (le16_to_cpu(fe->icbTag.flags) &
1687 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1688 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1689
1690 fe->icbTag.flags = cpu_to_le16(icbflags);
1691 if (sbi->s_udfrev >= 0x0200)
1692 fe->descTag.descVersion = cpu_to_le16(3);
1693 else
1694 fe->descTag.descVersion = cpu_to_le16(2);
1695 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1696 fe->descTag.tagLocation = cpu_to_le32(
1697 iinfo->i_location.logicalBlockNum);
1698 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1699 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1700 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1701 crclen));
1702 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1703
1704 out:
1705 set_buffer_uptodate(bh);
1706 unlock_buffer(bh);
1707
1708 /* write the data blocks */
1709 mark_buffer_dirty(bh);
1710 if (do_sync) {
1711 sync_dirty_buffer(bh);
1712 if (buffer_write_io_error(bh)) {
1713 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1714 inode->i_ino);
1715 err = -EIO;
1716 }
1717 }
1718 brelse(bh);
1719
1720 return err;
1721 }
1722
1723 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1724 {
1725 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1726 struct inode *inode = iget_locked(sb, block);
1727
1728 if (!inode)
1729 return NULL;
1730
1731 if (inode->i_state & I_NEW) {
1732 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1733 __udf_read_inode(inode);
1734 unlock_new_inode(inode);
1735 }
1736
1737 if (is_bad_inode(inode))
1738 goto out_iput;
1739
1740 if (ino->logicalBlockNum >= UDF_SB(sb)->
1741 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1742 udf_debug("block=%d, partition=%d out of range\n",
1743 ino->logicalBlockNum, ino->partitionReferenceNum);
1744 make_bad_inode(inode);
1745 goto out_iput;
1746 }
1747
1748 return inode;
1749
1750 out_iput:
1751 iput(inode);
1752 return NULL;
1753 }
1754
1755 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1756 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1757 {
1758 int adsize;
1759 struct short_ad *sad = NULL;
1760 struct long_ad *lad = NULL;
1761 struct allocExtDesc *aed;
1762 uint8_t *ptr;
1763 struct udf_inode_info *iinfo = UDF_I(inode);
1764
1765 if (!epos->bh)
1766 ptr = iinfo->i_ext.i_data + epos->offset -
1767 udf_file_entry_alloc_offset(inode) +
1768 iinfo->i_lenEAttr;
1769 else
1770 ptr = epos->bh->b_data + epos->offset;
1771
1772 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1773 adsize = sizeof(struct short_ad);
1774 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1775 adsize = sizeof(struct long_ad);
1776 else
1777 return -EIO;
1778
1779 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1780 unsigned char *sptr, *dptr;
1781 struct buffer_head *nbh;
1782 int err, loffset;
1783 struct kernel_lb_addr obloc = epos->block;
1784
1785 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1786 obloc.partitionReferenceNum,
1787 obloc.logicalBlockNum, &err);
1788 if (!epos->block.logicalBlockNum)
1789 return -ENOSPC;
1790 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1791 &epos->block,
1792 0));
1793 if (!nbh)
1794 return -EIO;
1795 lock_buffer(nbh);
1796 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1797 set_buffer_uptodate(nbh);
1798 unlock_buffer(nbh);
1799 mark_buffer_dirty_inode(nbh, inode);
1800
1801 aed = (struct allocExtDesc *)(nbh->b_data);
1802 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1803 aed->previousAllocExtLocation =
1804 cpu_to_le32(obloc.logicalBlockNum);
1805 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1806 loffset = epos->offset;
1807 aed->lengthAllocDescs = cpu_to_le32(adsize);
1808 sptr = ptr - adsize;
1809 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1810 memcpy(dptr, sptr, adsize);
1811 epos->offset = sizeof(struct allocExtDesc) + adsize;
1812 } else {
1813 loffset = epos->offset + adsize;
1814 aed->lengthAllocDescs = cpu_to_le32(0);
1815 sptr = ptr;
1816 epos->offset = sizeof(struct allocExtDesc);
1817
1818 if (epos->bh) {
1819 aed = (struct allocExtDesc *)epos->bh->b_data;
1820 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1821 } else {
1822 iinfo->i_lenAlloc += adsize;
1823 mark_inode_dirty(inode);
1824 }
1825 }
1826 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1827 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1828 epos->block.logicalBlockNum, sizeof(struct tag));
1829 else
1830 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1831 epos->block.logicalBlockNum, sizeof(struct tag));
1832 switch (iinfo->i_alloc_type) {
1833 case ICBTAG_FLAG_AD_SHORT:
1834 sad = (struct short_ad *)sptr;
1835 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1836 inode->i_sb->s_blocksize);
1837 sad->extPosition =
1838 cpu_to_le32(epos->block.logicalBlockNum);
1839 break;
1840 case ICBTAG_FLAG_AD_LONG:
1841 lad = (struct long_ad *)sptr;
1842 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1843 inode->i_sb->s_blocksize);
1844 lad->extLocation = cpu_to_lelb(epos->block);
1845 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1846 break;
1847 }
1848 if (epos->bh) {
1849 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1850 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1851 udf_update_tag(epos->bh->b_data, loffset);
1852 else
1853 udf_update_tag(epos->bh->b_data,
1854 sizeof(struct allocExtDesc));
1855 mark_buffer_dirty_inode(epos->bh, inode);
1856 brelse(epos->bh);
1857 } else {
1858 mark_inode_dirty(inode);
1859 }
1860 epos->bh = nbh;
1861 }
1862
1863 udf_write_aext(inode, epos, eloc, elen, inc);
1864
1865 if (!epos->bh) {
1866 iinfo->i_lenAlloc += adsize;
1867 mark_inode_dirty(inode);
1868 } else {
1869 aed = (struct allocExtDesc *)epos->bh->b_data;
1870 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1871 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1872 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1873 udf_update_tag(epos->bh->b_data,
1874 epos->offset + (inc ? 0 : adsize));
1875 else
1876 udf_update_tag(epos->bh->b_data,
1877 sizeof(struct allocExtDesc));
1878 mark_buffer_dirty_inode(epos->bh, inode);
1879 }
1880
1881 return 0;
1882 }
1883
1884 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1885 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1886 {
1887 int adsize;
1888 uint8_t *ptr;
1889 struct short_ad *sad;
1890 struct long_ad *lad;
1891 struct udf_inode_info *iinfo = UDF_I(inode);
1892
1893 if (!epos->bh)
1894 ptr = iinfo->i_ext.i_data + epos->offset -
1895 udf_file_entry_alloc_offset(inode) +
1896 iinfo->i_lenEAttr;
1897 else
1898 ptr = epos->bh->b_data + epos->offset;
1899
1900 switch (iinfo->i_alloc_type) {
1901 case ICBTAG_FLAG_AD_SHORT:
1902 sad = (struct short_ad *)ptr;
1903 sad->extLength = cpu_to_le32(elen);
1904 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1905 adsize = sizeof(struct short_ad);
1906 break;
1907 case ICBTAG_FLAG_AD_LONG:
1908 lad = (struct long_ad *)ptr;
1909 lad->extLength = cpu_to_le32(elen);
1910 lad->extLocation = cpu_to_lelb(*eloc);
1911 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1912 adsize = sizeof(struct long_ad);
1913 break;
1914 default:
1915 return;
1916 }
1917
1918 if (epos->bh) {
1919 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1920 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1921 struct allocExtDesc *aed =
1922 (struct allocExtDesc *)epos->bh->b_data;
1923 udf_update_tag(epos->bh->b_data,
1924 le32_to_cpu(aed->lengthAllocDescs) +
1925 sizeof(struct allocExtDesc));
1926 }
1927 mark_buffer_dirty_inode(epos->bh, inode);
1928 } else {
1929 mark_inode_dirty(inode);
1930 }
1931
1932 if (inc)
1933 epos->offset += adsize;
1934 }
1935
1936 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1937 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1938 {
1939 int8_t etype;
1940
1941 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1942 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1943 int block;
1944 epos->block = *eloc;
1945 epos->offset = sizeof(struct allocExtDesc);
1946 brelse(epos->bh);
1947 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1948 epos->bh = udf_tread(inode->i_sb, block);
1949 if (!epos->bh) {
1950 udf_debug("reading block %d failed!\n", block);
1951 return -1;
1952 }
1953 }
1954
1955 return etype;
1956 }
1957
1958 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1959 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1960 {
1961 int alen;
1962 int8_t etype;
1963 uint8_t *ptr;
1964 struct short_ad *sad;
1965 struct long_ad *lad;
1966 struct udf_inode_info *iinfo = UDF_I(inode);
1967
1968 if (!epos->bh) {
1969 if (!epos->offset)
1970 epos->offset = udf_file_entry_alloc_offset(inode);
1971 ptr = iinfo->i_ext.i_data + epos->offset -
1972 udf_file_entry_alloc_offset(inode) +
1973 iinfo->i_lenEAttr;
1974 alen = udf_file_entry_alloc_offset(inode) +
1975 iinfo->i_lenAlloc;
1976 } else {
1977 if (!epos->offset)
1978 epos->offset = sizeof(struct allocExtDesc);
1979 ptr = epos->bh->b_data + epos->offset;
1980 alen = sizeof(struct allocExtDesc) +
1981 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1982 lengthAllocDescs);
1983 }
1984
1985 switch (iinfo->i_alloc_type) {
1986 case ICBTAG_FLAG_AD_SHORT:
1987 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1988 if (!sad)
1989 return -1;
1990 etype = le32_to_cpu(sad->extLength) >> 30;
1991 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1992 eloc->partitionReferenceNum =
1993 iinfo->i_location.partitionReferenceNum;
1994 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1995 break;
1996 case ICBTAG_FLAG_AD_LONG:
1997 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1998 if (!lad)
1999 return -1;
2000 etype = le32_to_cpu(lad->extLength) >> 30;
2001 *eloc = lelb_to_cpu(lad->extLocation);
2002 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2003 break;
2004 default:
2005 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2006 return -1;
2007 }
2008
2009 return etype;
2010 }
2011
2012 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2013 struct kernel_lb_addr neloc, uint32_t nelen)
2014 {
2015 struct kernel_lb_addr oeloc;
2016 uint32_t oelen;
2017 int8_t etype;
2018
2019 if (epos.bh)
2020 get_bh(epos.bh);
2021
2022 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2023 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2024 neloc = oeloc;
2025 nelen = (etype << 30) | oelen;
2026 }
2027 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2028 brelse(epos.bh);
2029
2030 return (nelen >> 30);
2031 }
2032
2033 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2034 struct kernel_lb_addr eloc, uint32_t elen)
2035 {
2036 struct extent_position oepos;
2037 int adsize;
2038 int8_t etype;
2039 struct allocExtDesc *aed;
2040 struct udf_inode_info *iinfo;
2041
2042 if (epos.bh) {
2043 get_bh(epos.bh);
2044 get_bh(epos.bh);
2045 }
2046
2047 iinfo = UDF_I(inode);
2048 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2049 adsize = sizeof(struct short_ad);
2050 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2051 adsize = sizeof(struct long_ad);
2052 else
2053 adsize = 0;
2054
2055 oepos = epos;
2056 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2057 return -1;
2058
2059 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2060 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2061 if (oepos.bh != epos.bh) {
2062 oepos.block = epos.block;
2063 brelse(oepos.bh);
2064 get_bh(epos.bh);
2065 oepos.bh = epos.bh;
2066 oepos.offset = epos.offset - adsize;
2067 }
2068 }
2069 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2070 elen = 0;
2071
2072 if (epos.bh != oepos.bh) {
2073 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2074 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2075 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2076 if (!oepos.bh) {
2077 iinfo->i_lenAlloc -= (adsize * 2);
2078 mark_inode_dirty(inode);
2079 } else {
2080 aed = (struct allocExtDesc *)oepos.bh->b_data;
2081 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2082 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2083 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2084 udf_update_tag(oepos.bh->b_data,
2085 oepos.offset - (2 * adsize));
2086 else
2087 udf_update_tag(oepos.bh->b_data,
2088 sizeof(struct allocExtDesc));
2089 mark_buffer_dirty_inode(oepos.bh, inode);
2090 }
2091 } else {
2092 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2093 if (!oepos.bh) {
2094 iinfo->i_lenAlloc -= adsize;
2095 mark_inode_dirty(inode);
2096 } else {
2097 aed = (struct allocExtDesc *)oepos.bh->b_data;
2098 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2099 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2100 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2101 udf_update_tag(oepos.bh->b_data,
2102 epos.offset - adsize);
2103 else
2104 udf_update_tag(oepos.bh->b_data,
2105 sizeof(struct allocExtDesc));
2106 mark_buffer_dirty_inode(oepos.bh, inode);
2107 }
2108 }
2109
2110 brelse(epos.bh);
2111 brelse(oepos.bh);
2112
2113 return (elen >> 30);
2114 }
2115
2116 int8_t inode_bmap(struct inode *inode, sector_t block,
2117 struct extent_position *pos, struct kernel_lb_addr *eloc,
2118 uint32_t *elen, sector_t *offset)
2119 {
2120 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2121 loff_t lbcount = 0, bcount =
2122 (loff_t) block << blocksize_bits;
2123 int8_t etype;
2124 struct udf_inode_info *iinfo;
2125
2126 iinfo = UDF_I(inode);
2127 pos->offset = 0;
2128 pos->block = iinfo->i_location;
2129 pos->bh = NULL;
2130 *elen = 0;
2131
2132 do {
2133 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2134 if (etype == -1) {
2135 *offset = (bcount - lbcount) >> blocksize_bits;
2136 iinfo->i_lenExtents = lbcount;
2137 return -1;
2138 }
2139 lbcount += *elen;
2140 } while (lbcount <= bcount);
2141
2142 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2143
2144 return etype;
2145 }
2146
2147 long udf_block_map(struct inode *inode, sector_t block)
2148 {
2149 struct kernel_lb_addr eloc;
2150 uint32_t elen;
2151 sector_t offset;
2152 struct extent_position epos = {};
2153 int ret;
2154
2155 down_read(&UDF_I(inode)->i_data_sem);
2156
2157 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2158 (EXT_RECORDED_ALLOCATED >> 30))
2159 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2160 else
2161 ret = 0;
2162
2163 up_read(&UDF_I(inode)->i_data_sem);
2164 brelse(epos.bh);
2165
2166 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2167 return udf_fixed_to_variable(ret);
2168 else
2169 return ret;
2170 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree