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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / fs / udf / inode.c
blob062b7925bca04c02949919ac37aab790d7b982a2
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 #include <linux/aio.h>
42
43 #include "udf_i.h"
44 #include "udf_sb.h"
45
46 MODULE_AUTHOR("Ben Fennema");
47 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
48 MODULE_LICENSE("GPL");
49
50 #define EXTENT_MERGE_SIZE 5
51
52 static umode_t udf_convert_permissions(struct fileEntry *);
53 static int udf_update_inode(struct inode *, int);
54 static void udf_fill_inode(struct inode *, struct buffer_head *);
55 static int udf_sync_inode(struct inode *inode);
56 static int udf_alloc_i_data(struct inode *inode, size_t size);
57 static sector_t inode_getblk(struct inode *, sector_t, int *, 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 static void __udf_clear_extent_cache(struct inode *inode)
72 {
73 struct udf_inode_info *iinfo = UDF_I(inode);
74
75 if (iinfo->cached_extent.lstart != -1) {
76 brelse(iinfo->cached_extent.epos.bh);
77 iinfo->cached_extent.lstart = -1;
78 }
79 }
80
81 /* Invalidate extent cache */
82 static void udf_clear_extent_cache(struct inode *inode)
83 {
84 struct udf_inode_info *iinfo = UDF_I(inode);
85
86 spin_lock(&iinfo->i_extent_cache_lock);
87 __udf_clear_extent_cache(inode);
88 spin_unlock(&iinfo->i_extent_cache_lock);
89 }
90
91 /* Return contents of extent cache */
92 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
93 loff_t *lbcount, struct extent_position *pos)
94 {
95 struct udf_inode_info *iinfo = UDF_I(inode);
96 int ret = 0;
97
98 spin_lock(&iinfo->i_extent_cache_lock);
99 if ((iinfo->cached_extent.lstart <= bcount) &&
100 (iinfo->cached_extent.lstart != -1)) {
101 /* Cache hit */
102 *lbcount = iinfo->cached_extent.lstart;
103 memcpy(pos, &iinfo->cached_extent.epos,
104 sizeof(struct extent_position));
105 if (pos->bh)
106 get_bh(pos->bh);
107 ret = 1;
108 }
109 spin_unlock(&iinfo->i_extent_cache_lock);
110 return ret;
111 }
112
113 /* Add extent to extent cache */
114 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
115 struct extent_position *pos, int next_epos)
116 {
117 struct udf_inode_info *iinfo = UDF_I(inode);
118
119 spin_lock(&iinfo->i_extent_cache_lock);
120 /* Invalidate previously cached extent */
121 __udf_clear_extent_cache(inode);
122 if (pos->bh)
123 get_bh(pos->bh);
124 memcpy(&iinfo->cached_extent.epos, pos,
125 sizeof(struct extent_position));
126 iinfo->cached_extent.lstart = estart;
127 if (next_epos)
128 switch (iinfo->i_alloc_type) {
129 case ICBTAG_FLAG_AD_SHORT:
130 iinfo->cached_extent.epos.offset -=
131 sizeof(struct short_ad);
132 break;
133 case ICBTAG_FLAG_AD_LONG:
134 iinfo->cached_extent.epos.offset -=
135 sizeof(struct long_ad);
136 }
137 spin_unlock(&iinfo->i_extent_cache_lock);
138 }
139
140 void udf_evict_inode(struct inode *inode)
141 {
142 struct udf_inode_info *iinfo = UDF_I(inode);
143 int want_delete = 0;
144
145 if (!inode->i_nlink && !is_bad_inode(inode)) {
146 want_delete = 1;
147 udf_setsize(inode, 0);
148 udf_update_inode(inode, IS_SYNC(inode));
149 } else
150 truncate_inode_pages(&inode->i_data, 0);
151 invalidate_inode_buffers(inode);
152 clear_inode(inode);
153 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
154 inode->i_size != iinfo->i_lenExtents) {
155 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",
156 inode->i_ino, inode->i_mode,
157 (unsigned long long)inode->i_size,
158 (unsigned long long)iinfo->i_lenExtents);
159 }
160 kfree(iinfo->i_ext.i_data);
161 iinfo->i_ext.i_data = NULL;
162 udf_clear_extent_cache(inode);
163 if (want_delete) {
164 udf_free_inode(inode);
165 }
166 }
167
168 static void udf_write_failed(struct address_space *mapping, loff_t to)
169 {
170 struct inode *inode = mapping->host;
171 struct udf_inode_info *iinfo = UDF_I(inode);
172 loff_t isize = inode->i_size;
173
174 if (to > isize) {
175 truncate_pagecache(inode, isize);
176 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
177 down_write(&iinfo->i_data_sem);
178 udf_clear_extent_cache(inode);
179 udf_truncate_extents(inode);
180 up_write(&iinfo->i_data_sem);
181 }
182 }
183 }
184
185 static int udf_writepage(struct page *page, struct writeback_control *wbc)
186 {
187 return block_write_full_page(page, udf_get_block, wbc);
188 }
189
190 static int udf_writepages(struct address_space *mapping,
191 struct writeback_control *wbc)
192 {
193 return mpage_writepages(mapping, wbc, udf_get_block);
194 }
195
196 static int udf_readpage(struct file *file, struct page *page)
197 {
198 return mpage_readpage(page, udf_get_block);
199 }
200
201 static int udf_readpages(struct file *file, struct address_space *mapping,
202 struct list_head *pages, unsigned nr_pages)
203 {
204 return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
205 }
206
207 static int udf_write_begin(struct file *file, struct address_space *mapping,
208 loff_t pos, unsigned len, unsigned flags,
209 struct page **pagep, void **fsdata)
210 {
211 int ret;
212
213 ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
214 if (unlikely(ret))
215 udf_write_failed(mapping, pos + len);
216 return ret;
217 }
218
219 static ssize_t udf_direct_IO(int rw, struct kiocb *iocb,
220 const struct iovec *iov,
221 loff_t offset, unsigned long nr_segs)
222 {
223 struct file *file = iocb->ki_filp;
224 struct address_space *mapping = file->f_mapping;
225 struct inode *inode = mapping->host;
226 ssize_t ret;
227
228 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
229 udf_get_block);
230 if (unlikely(ret < 0 && (rw & WRITE)))
231 udf_write_failed(mapping, offset + iov_length(iov, nr_segs));
232 return ret;
233 }
234
235 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
236 {
237 return generic_block_bmap(mapping, block, udf_get_block);
238 }
239
240 const struct address_space_operations udf_aops = {
241 .readpage = udf_readpage,
242 .readpages = udf_readpages,
243 .writepage = udf_writepage,
244 .writepages = udf_writepages,
245 .write_begin = udf_write_begin,
246 .write_end = generic_write_end,
247 .direct_IO = udf_direct_IO,
248 .bmap = udf_bmap,
249 };
250
251 /*
252 * Expand file stored in ICB to a normal one-block-file
253 *
254 * This function requires i_data_sem for writing and releases it.
255 * This function requires i_mutex held
256 */
257 int udf_expand_file_adinicb(struct inode *inode)
258 {
259 struct page *page;
260 char *kaddr;
261 struct udf_inode_info *iinfo = UDF_I(inode);
262 int err;
263 struct writeback_control udf_wbc = {
264 .sync_mode = WB_SYNC_NONE,
265 .nr_to_write = 1,
266 };
267
268 if (!iinfo->i_lenAlloc) {
269 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
270 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
271 else
272 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
273 /* from now on we have normal address_space methods */
274 inode->i_data.a_ops = &udf_aops;
275 up_write(&iinfo->i_data_sem);
276 mark_inode_dirty(inode);
277 return 0;
278 }
279 /*
280 * Release i_data_sem so that we can lock a page - page lock ranks
281 * above i_data_sem. i_mutex still protects us against file changes.
282 */
283 up_write(&iinfo->i_data_sem);
284
285 page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
286 if (!page)
287 return -ENOMEM;
288
289 if (!PageUptodate(page)) {
290 kaddr = kmap(page);
291 memset(kaddr + iinfo->i_lenAlloc, 0x00,
292 PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
293 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
294 iinfo->i_lenAlloc);
295 flush_dcache_page(page);
296 SetPageUptodate(page);
297 kunmap(page);
298 }
299 down_write(&iinfo->i_data_sem);
300 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
301 iinfo->i_lenAlloc);
302 iinfo->i_lenAlloc = 0;
303 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
304 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
305 else
306 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
307 /* from now on we have normal address_space methods */
308 inode->i_data.a_ops = &udf_aops;
309 up_write(&iinfo->i_data_sem);
310 err = inode->i_data.a_ops->writepage(page, &udf_wbc);
311 if (err) {
312 /* Restore everything back so that we don't lose data... */
313 lock_page(page);
314 kaddr = kmap(page);
315 down_write(&iinfo->i_data_sem);
316 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
317 inode->i_size);
318 kunmap(page);
319 unlock_page(page);
320 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
321 inode->i_data.a_ops = &udf_adinicb_aops;
322 up_write(&iinfo->i_data_sem);
323 }
324 page_cache_release(page);
325 mark_inode_dirty(inode);
326
327 return err;
328 }
329
330 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
331 int *err)
332 {
333 int newblock;
334 struct buffer_head *dbh = NULL;
335 struct kernel_lb_addr eloc;
336 uint8_t alloctype;
337 struct extent_position epos;
338
339 struct udf_fileident_bh sfibh, dfibh;
340 loff_t f_pos = udf_ext0_offset(inode);
341 int size = udf_ext0_offset(inode) + inode->i_size;
342 struct fileIdentDesc cfi, *sfi, *dfi;
343 struct udf_inode_info *iinfo = UDF_I(inode);
344
345 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
346 alloctype = ICBTAG_FLAG_AD_SHORT;
347 else
348 alloctype = ICBTAG_FLAG_AD_LONG;
349
350 if (!inode->i_size) {
351 iinfo->i_alloc_type = alloctype;
352 mark_inode_dirty(inode);
353 return NULL;
354 }
355
356 /* alloc block, and copy data to it */
357 *block = udf_new_block(inode->i_sb, inode,
358 iinfo->i_location.partitionReferenceNum,
359 iinfo->i_location.logicalBlockNum, err);
360 if (!(*block))
361 return NULL;
362 newblock = udf_get_pblock(inode->i_sb, *block,
363 iinfo->i_location.partitionReferenceNum,
364 0);
365 if (!newblock)
366 return NULL;
367 dbh = udf_tgetblk(inode->i_sb, newblock);
368 if (!dbh)
369 return NULL;
370 lock_buffer(dbh);
371 memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
372 set_buffer_uptodate(dbh);
373 unlock_buffer(dbh);
374 mark_buffer_dirty_inode(dbh, inode);
375
376 sfibh.soffset = sfibh.eoffset =
377 f_pos & (inode->i_sb->s_blocksize - 1);
378 sfibh.sbh = sfibh.ebh = NULL;
379 dfibh.soffset = dfibh.eoffset = 0;
380 dfibh.sbh = dfibh.ebh = dbh;
381 while (f_pos < size) {
382 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
383 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
384 NULL, NULL, NULL);
385 if (!sfi) {
386 brelse(dbh);
387 return NULL;
388 }
389 iinfo->i_alloc_type = alloctype;
390 sfi->descTag.tagLocation = cpu_to_le32(*block);
391 dfibh.soffset = dfibh.eoffset;
392 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
393 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
394 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
395 sfi->fileIdent +
396 le16_to_cpu(sfi->lengthOfImpUse))) {
397 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
398 brelse(dbh);
399 return NULL;
400 }
401 }
402 mark_buffer_dirty_inode(dbh, inode);
403
404 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
405 iinfo->i_lenAlloc);
406 iinfo->i_lenAlloc = 0;
407 eloc.logicalBlockNum = *block;
408 eloc.partitionReferenceNum =
409 iinfo->i_location.partitionReferenceNum;
410 iinfo->i_lenExtents = inode->i_size;
411 epos.bh = NULL;
412 epos.block = iinfo->i_location;
413 epos.offset = udf_file_entry_alloc_offset(inode);
414 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
415 /* UniqueID stuff */
416
417 brelse(epos.bh);
418 mark_inode_dirty(inode);
419 return dbh;
420 }
421
422 static int udf_get_block(struct inode *inode, sector_t block,
423 struct buffer_head *bh_result, int create)
424 {
425 int err, new;
426 sector_t phys = 0;
427 struct udf_inode_info *iinfo;
428
429 if (!create) {
430 phys = udf_block_map(inode, block);
431 if (phys)
432 map_bh(bh_result, inode->i_sb, phys);
433 return 0;
434 }
435
436 err = -EIO;
437 new = 0;
438 iinfo = UDF_I(inode);
439
440 down_write(&iinfo->i_data_sem);
441 if (block == iinfo->i_next_alloc_block + 1) {
442 iinfo->i_next_alloc_block++;
443 iinfo->i_next_alloc_goal++;
444 }
445
446 udf_clear_extent_cache(inode);
447 phys = inode_getblk(inode, block, &err, &new);
448 if (!phys)
449 goto abort;
450
451 if (new)
452 set_buffer_new(bh_result);
453 map_bh(bh_result, inode->i_sb, phys);
454
455 abort:
456 up_write(&iinfo->i_data_sem);
457 return err;
458 }
459
460 static struct buffer_head *udf_getblk(struct inode *inode, long block,
461 int create, int *err)
462 {
463 struct buffer_head *bh;
464 struct buffer_head dummy;
465
466 dummy.b_state = 0;
467 dummy.b_blocknr = -1000;
468 *err = udf_get_block(inode, block, &dummy, create);
469 if (!*err && buffer_mapped(&dummy)) {
470 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
471 if (buffer_new(&dummy)) {
472 lock_buffer(bh);
473 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
474 set_buffer_uptodate(bh);
475 unlock_buffer(bh);
476 mark_buffer_dirty_inode(bh, inode);
477 }
478 return bh;
479 }
480
481 return NULL;
482 }
483
484 /* Extend the file by 'blocks' blocks, return the number of extents added */
485 static int udf_do_extend_file(struct inode *inode,
486 struct extent_position *last_pos,
487 struct kernel_long_ad *last_ext,
488 sector_t blocks)
489 {
490 sector_t add;
491 int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
492 struct super_block *sb = inode->i_sb;
493 struct kernel_lb_addr prealloc_loc = {};
494 int prealloc_len = 0;
495 struct udf_inode_info *iinfo;
496 int err;
497
498 /* The previous extent is fake and we should not extend by anything
499 * - there's nothing to do... */
500 if (!blocks && fake)
501 return 0;
502
503 iinfo = UDF_I(inode);
504 /* Round the last extent up to a multiple of block size */
505 if (last_ext->extLength & (sb->s_blocksize - 1)) {
506 last_ext->extLength =
507 (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
508 (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
509 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
510 iinfo->i_lenExtents =
511 (iinfo->i_lenExtents + sb->s_blocksize - 1) &
512 ~(sb->s_blocksize - 1);
513 }
514
515 /* Last extent are just preallocated blocks? */
516 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
517 EXT_NOT_RECORDED_ALLOCATED) {
518 /* Save the extent so that we can reattach it to the end */
519 prealloc_loc = last_ext->extLocation;
520 prealloc_len = last_ext->extLength;
521 /* Mark the extent as a hole */
522 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
523 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
524 last_ext->extLocation.logicalBlockNum = 0;
525 last_ext->extLocation.partitionReferenceNum = 0;
526 }
527
528 /* Can we merge with the previous extent? */
529 if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
530 EXT_NOT_RECORDED_NOT_ALLOCATED) {
531 add = ((1 << 30) - sb->s_blocksize -
532 (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
533 sb->s_blocksize_bits;
534 if (add > blocks)
535 add = blocks;
536 blocks -= add;
537 last_ext->extLength += add << sb->s_blocksize_bits;
538 }
539
540 if (fake) {
541 udf_add_aext(inode, last_pos, &last_ext->extLocation,
542 last_ext->extLength, 1);
543 count++;
544 } else
545 udf_write_aext(inode, last_pos, &last_ext->extLocation,
546 last_ext->extLength, 1);
547
548 /* Managed to do everything necessary? */
549 if (!blocks)
550 goto out;
551
552 /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
553 last_ext->extLocation.logicalBlockNum = 0;
554 last_ext->extLocation.partitionReferenceNum = 0;
555 add = (1 << (30-sb->s_blocksize_bits)) - 1;
556 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
557 (add << sb->s_blocksize_bits);
558
559 /* Create enough extents to cover the whole hole */
560 while (blocks > add) {
561 blocks -= add;
562 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
563 last_ext->extLength, 1);
564 if (err)
565 return err;
566 count++;
567 }
568 if (blocks) {
569 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
570 (blocks << sb->s_blocksize_bits);
571 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
572 last_ext->extLength, 1);
573 if (err)
574 return err;
575 count++;
576 }
577
578 out:
579 /* Do we have some preallocated blocks saved? */
580 if (prealloc_len) {
581 err = udf_add_aext(inode, last_pos, &prealloc_loc,
582 prealloc_len, 1);
583 if (err)
584 return err;
585 last_ext->extLocation = prealloc_loc;
586 last_ext->extLength = prealloc_len;
587 count++;
588 }
589
590 /* last_pos should point to the last written extent... */
591 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
592 last_pos->offset -= sizeof(struct short_ad);
593 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
594 last_pos->offset -= sizeof(struct long_ad);
595 else
596 return -EIO;
597
598 return count;
599 }
600
601 static int udf_extend_file(struct inode *inode, loff_t newsize)
602 {
603
604 struct extent_position epos;
605 struct kernel_lb_addr eloc;
606 uint32_t elen;
607 int8_t etype;
608 struct super_block *sb = inode->i_sb;
609 sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
610 int adsize;
611 struct udf_inode_info *iinfo = UDF_I(inode);
612 struct kernel_long_ad extent;
613 int err;
614
615 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
616 adsize = sizeof(struct short_ad);
617 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
618 adsize = sizeof(struct long_ad);
619 else
620 BUG();
621
622 etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
623
624 /* File has extent covering the new size (could happen when extending
625 * inside a block)? */
626 if (etype != -1)
627 return 0;
628 if (newsize & (sb->s_blocksize - 1))
629 offset++;
630 /* Extended file just to the boundary of the last file block? */
631 if (offset == 0)
632 return 0;
633
634 /* Truncate is extending the file by 'offset' blocks */
635 if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
636 (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
637 /* File has no extents at all or has empty last
638 * indirect extent! Create a fake extent... */
639 extent.extLocation.logicalBlockNum = 0;
640 extent.extLocation.partitionReferenceNum = 0;
641 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
642 } else {
643 epos.offset -= adsize;
644 etype = udf_next_aext(inode, &epos, &extent.extLocation,
645 &extent.extLength, 0);
646 extent.extLength |= etype << 30;
647 }
648 err = udf_do_extend_file(inode, &epos, &extent, offset);
649 if (err < 0)
650 goto out;
651 err = 0;
652 iinfo->i_lenExtents = newsize;
653 out:
654 brelse(epos.bh);
655 return err;
656 }
657
658 static sector_t inode_getblk(struct inode *inode, sector_t block,
659 int *err, int *new)
660 {
661 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
662 struct extent_position prev_epos, cur_epos, next_epos;
663 int count = 0, startnum = 0, endnum = 0;
664 uint32_t elen = 0, tmpelen;
665 struct kernel_lb_addr eloc, tmpeloc;
666 int c = 1;
667 loff_t lbcount = 0, b_off = 0;
668 uint32_t newblocknum, newblock;
669 sector_t offset = 0;
670 int8_t etype;
671 struct udf_inode_info *iinfo = UDF_I(inode);
672 int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
673 int lastblock = 0;
674 bool isBeyondEOF;
675
676 *err = 0;
677 *new = 0;
678 prev_epos.offset = udf_file_entry_alloc_offset(inode);
679 prev_epos.block = iinfo->i_location;
680 prev_epos.bh = NULL;
681 cur_epos = next_epos = prev_epos;
682 b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
683
684 /* find the extent which contains the block we are looking for.
685 alternate between laarr[0] and laarr[1] for locations of the
686 current extent, and the previous extent */
687 do {
688 if (prev_epos.bh != cur_epos.bh) {
689 brelse(prev_epos.bh);
690 get_bh(cur_epos.bh);
691 prev_epos.bh = cur_epos.bh;
692 }
693 if (cur_epos.bh != next_epos.bh) {
694 brelse(cur_epos.bh);
695 get_bh(next_epos.bh);
696 cur_epos.bh = next_epos.bh;
697 }
698
699 lbcount += elen;
700
701 prev_epos.block = cur_epos.block;
702 cur_epos.block = next_epos.block;
703
704 prev_epos.offset = cur_epos.offset;
705 cur_epos.offset = next_epos.offset;
706
707 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
708 if (etype == -1)
709 break;
710
711 c = !c;
712
713 laarr[c].extLength = (etype << 30) | elen;
714 laarr[c].extLocation = eloc;
715
716 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
717 pgoal = eloc.logicalBlockNum +
718 ((elen + inode->i_sb->s_blocksize - 1) >>
719 inode->i_sb->s_blocksize_bits);
720
721 count++;
722 } while (lbcount + elen <= b_off);
723
724 b_off -= lbcount;
725 offset = b_off >> inode->i_sb->s_blocksize_bits;
726 /*
727 * Move prev_epos and cur_epos into indirect extent if we are at
728 * the pointer to it
729 */
730 udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
731 udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
732
733 /* if the extent is allocated and recorded, return the block
734 if the extent is not a multiple of the blocksize, round up */
735
736 if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
737 if (elen & (inode->i_sb->s_blocksize - 1)) {
738 elen = EXT_RECORDED_ALLOCATED |
739 ((elen + inode->i_sb->s_blocksize - 1) &
740 ~(inode->i_sb->s_blocksize - 1));
741 udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
742 }
743 brelse(prev_epos.bh);
744 brelse(cur_epos.bh);
745 brelse(next_epos.bh);
746 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
747 return newblock;
748 }
749
750 /* Are we beyond EOF? */
751 if (etype == -1) {
752 int ret;
753 isBeyondEOF = 1;
754 if (count) {
755 if (c)
756 laarr[0] = laarr[1];
757 startnum = 1;
758 } else {
759 /* Create a fake extent when there's not one */
760 memset(&laarr[0].extLocation, 0x00,
761 sizeof(struct kernel_lb_addr));
762 laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
763 /* Will udf_do_extend_file() create real extent from
764 a fake one? */
765 startnum = (offset > 0);
766 }
767 /* Create extents for the hole between EOF and offset */
768 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
769 if (ret < 0) {
770 brelse(prev_epos.bh);
771 brelse(cur_epos.bh);
772 brelse(next_epos.bh);
773 *err = ret;
774 return 0;
775 }
776 c = 0;
777 offset = 0;
778 count += ret;
779 /* We are not covered by a preallocated extent? */
780 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
781 EXT_NOT_RECORDED_ALLOCATED) {
782 /* Is there any real extent? - otherwise we overwrite
783 * the fake one... */
784 if (count)
785 c = !c;
786 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
787 inode->i_sb->s_blocksize;
788 memset(&laarr[c].extLocation, 0x00,
789 sizeof(struct kernel_lb_addr));
790 count++;
791 }
792 endnum = c + 1;
793 lastblock = 1;
794 } else {
795 isBeyondEOF = 0;
796 endnum = startnum = ((count > 2) ? 2 : count);
797
798 /* if the current extent is in position 0,
799 swap it with the previous */
800 if (!c && count != 1) {
801 laarr[2] = laarr[0];
802 laarr[0] = laarr[1];
803 laarr[1] = laarr[2];
804 c = 1;
805 }
806
807 /* if the current block is located in an extent,
808 read the next extent */
809 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
810 if (etype != -1) {
811 laarr[c + 1].extLength = (etype << 30) | elen;
812 laarr[c + 1].extLocation = eloc;
813 count++;
814 startnum++;
815 endnum++;
816 } else
817 lastblock = 1;
818 }
819
820 /* if the current extent is not recorded but allocated, get the
821 * block in the extent corresponding to the requested block */
822 if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
823 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
824 else { /* otherwise, allocate a new block */
825 if (iinfo->i_next_alloc_block == block)
826 goal = iinfo->i_next_alloc_goal;
827
828 if (!goal) {
829 if (!(goal = pgoal)) /* XXX: what was intended here? */
830 goal = iinfo->i_location.logicalBlockNum + 1;
831 }
832
833 newblocknum = udf_new_block(inode->i_sb, inode,
834 iinfo->i_location.partitionReferenceNum,
835 goal, err);
836 if (!newblocknum) {
837 brelse(prev_epos.bh);
838 brelse(cur_epos.bh);
839 brelse(next_epos.bh);
840 *err = -ENOSPC;
841 return 0;
842 }
843 if (isBeyondEOF)
844 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
845 }
846
847 /* if the extent the requsted block is located in contains multiple
848 * blocks, split the extent into at most three extents. blocks prior
849 * to requested block, requested block, and blocks after requested
850 * block */
851 udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
852
853 #ifdef UDF_PREALLOCATE
854 /* We preallocate blocks only for regular files. It also makes sense
855 * for directories but there's a problem when to drop the
856 * preallocation. We might use some delayed work for that but I feel
857 * it's overengineering for a filesystem like UDF. */
858 if (S_ISREG(inode->i_mode))
859 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
860 #endif
861
862 /* merge any continuous blocks in laarr */
863 udf_merge_extents(inode, laarr, &endnum);
864
865 /* write back the new extents, inserting new extents if the new number
866 * of extents is greater than the old number, and deleting extents if
867 * the new number of extents is less than the old number */
868 udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
869
870 brelse(prev_epos.bh);
871 brelse(cur_epos.bh);
872 brelse(next_epos.bh);
873
874 newblock = udf_get_pblock(inode->i_sb, newblocknum,
875 iinfo->i_location.partitionReferenceNum, 0);
876 if (!newblock) {
877 *err = -EIO;
878 return 0;
879 }
880 *new = 1;
881 iinfo->i_next_alloc_block = block;
882 iinfo->i_next_alloc_goal = newblocknum;
883 inode->i_ctime = current_fs_time(inode->i_sb);
884
885 if (IS_SYNC(inode))
886 udf_sync_inode(inode);
887 else
888 mark_inode_dirty(inode);
889
890 return newblock;
891 }
892
893 static void udf_split_extents(struct inode *inode, int *c, int offset,
894 int newblocknum,
895 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
896 int *endnum)
897 {
898 unsigned long blocksize = inode->i_sb->s_blocksize;
899 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
900
901 if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
902 (laarr[*c].extLength >> 30) ==
903 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
904 int curr = *c;
905 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
906 blocksize - 1) >> blocksize_bits;
907 int8_t etype = (laarr[curr].extLength >> 30);
908
909 if (blen == 1)
910 ;
911 else if (!offset || blen == offset + 1) {
912 laarr[curr + 2] = laarr[curr + 1];
913 laarr[curr + 1] = laarr[curr];
914 } else {
915 laarr[curr + 3] = laarr[curr + 1];
916 laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
917 }
918
919 if (offset) {
920 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
921 udf_free_blocks(inode->i_sb, inode,
922 &laarr[curr].extLocation,
923 0, offset);
924 laarr[curr].extLength =
925 EXT_NOT_RECORDED_NOT_ALLOCATED |
926 (offset << blocksize_bits);
927 laarr[curr].extLocation.logicalBlockNum = 0;
928 laarr[curr].extLocation.
929 partitionReferenceNum = 0;
930 } else
931 laarr[curr].extLength = (etype << 30) |
932 (offset << blocksize_bits);
933 curr++;
934 (*c)++;
935 (*endnum)++;
936 }
937
938 laarr[curr].extLocation.logicalBlockNum = newblocknum;
939 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
940 laarr[curr].extLocation.partitionReferenceNum =
941 UDF_I(inode)->i_location.partitionReferenceNum;
942 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
943 blocksize;
944 curr++;
945
946 if (blen != offset + 1) {
947 if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
948 laarr[curr].extLocation.logicalBlockNum +=
949 offset + 1;
950 laarr[curr].extLength = (etype << 30) |
951 ((blen - (offset + 1)) << blocksize_bits);
952 curr++;
953 (*endnum)++;
954 }
955 }
956 }
957
958 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
959 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
960 int *endnum)
961 {
962 int start, length = 0, currlength = 0, i;
963
964 if (*endnum >= (c + 1)) {
965 if (!lastblock)
966 return;
967 else
968 start = c;
969 } else {
970 if ((laarr[c + 1].extLength >> 30) ==
971 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
972 start = c + 1;
973 length = currlength =
974 (((laarr[c + 1].extLength &
975 UDF_EXTENT_LENGTH_MASK) +
976 inode->i_sb->s_blocksize - 1) >>
977 inode->i_sb->s_blocksize_bits);
978 } else
979 start = c;
980 }
981
982 for (i = start + 1; i <= *endnum; i++) {
983 if (i == *endnum) {
984 if (lastblock)
985 length += UDF_DEFAULT_PREALLOC_BLOCKS;
986 } else if ((laarr[i].extLength >> 30) ==
987 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
988 length += (((laarr[i].extLength &
989 UDF_EXTENT_LENGTH_MASK) +
990 inode->i_sb->s_blocksize - 1) >>
991 inode->i_sb->s_blocksize_bits);
992 } else
993 break;
994 }
995
996 if (length) {
997 int next = laarr[start].extLocation.logicalBlockNum +
998 (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
999 inode->i_sb->s_blocksize - 1) >>
1000 inode->i_sb->s_blocksize_bits);
1001 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1002 laarr[start].extLocation.partitionReferenceNum,
1003 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1004 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1005 currlength);
1006 if (numalloc) {
1007 if (start == (c + 1))
1008 laarr[start].extLength +=
1009 (numalloc <<
1010 inode->i_sb->s_blocksize_bits);
1011 else {
1012 memmove(&laarr[c + 2], &laarr[c + 1],
1013 sizeof(struct long_ad) * (*endnum - (c + 1)));
1014 (*endnum)++;
1015 laarr[c + 1].extLocation.logicalBlockNum = next;
1016 laarr[c + 1].extLocation.partitionReferenceNum =
1017 laarr[c].extLocation.
1018 partitionReferenceNum;
1019 laarr[c + 1].extLength =
1020 EXT_NOT_RECORDED_ALLOCATED |
1021 (numalloc <<
1022 inode->i_sb->s_blocksize_bits);
1023 start = c + 1;
1024 }
1025
1026 for (i = start + 1; numalloc && i < *endnum; i++) {
1027 int elen = ((laarr[i].extLength &
1028 UDF_EXTENT_LENGTH_MASK) +
1029 inode->i_sb->s_blocksize - 1) >>
1030 inode->i_sb->s_blocksize_bits;
1031
1032 if (elen > numalloc) {
1033 laarr[i].extLength -=
1034 (numalloc <<
1035 inode->i_sb->s_blocksize_bits);
1036 numalloc = 0;
1037 } else {
1038 numalloc -= elen;
1039 if (*endnum > (i + 1))
1040 memmove(&laarr[i],
1041 &laarr[i + 1],
1042 sizeof(struct long_ad) *
1043 (*endnum - (i + 1)));
1044 i--;
1045 (*endnum)--;
1046 }
1047 }
1048 UDF_I(inode)->i_lenExtents +=
1049 numalloc << inode->i_sb->s_blocksize_bits;
1050 }
1051 }
1052 }
1053
1054 static void udf_merge_extents(struct inode *inode,
1055 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1056 int *endnum)
1057 {
1058 int i;
1059 unsigned long blocksize = inode->i_sb->s_blocksize;
1060 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1061
1062 for (i = 0; i < (*endnum - 1); i++) {
1063 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1064 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1065
1066 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1067 (((li->extLength >> 30) ==
1068 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1069 ((lip1->extLocation.logicalBlockNum -
1070 li->extLocation.logicalBlockNum) ==
1071 (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1072 blocksize - 1) >> blocksize_bits)))) {
1073
1074 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1075 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1076 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1077 lip1->extLength = (lip1->extLength -
1078 (li->extLength &
1079 UDF_EXTENT_LENGTH_MASK) +
1080 UDF_EXTENT_LENGTH_MASK) &
1081 ~(blocksize - 1);
1082 li->extLength = (li->extLength &
1083 UDF_EXTENT_FLAG_MASK) +
1084 (UDF_EXTENT_LENGTH_MASK + 1) -
1085 blocksize;
1086 lip1->extLocation.logicalBlockNum =
1087 li->extLocation.logicalBlockNum +
1088 ((li->extLength &
1089 UDF_EXTENT_LENGTH_MASK) >>
1090 blocksize_bits);
1091 } else {
1092 li->extLength = lip1->extLength +
1093 (((li->extLength &
1094 UDF_EXTENT_LENGTH_MASK) +
1095 blocksize - 1) & ~(blocksize - 1));
1096 if (*endnum > (i + 2))
1097 memmove(&laarr[i + 1], &laarr[i + 2],
1098 sizeof(struct long_ad) *
1099 (*endnum - (i + 2)));
1100 i--;
1101 (*endnum)--;
1102 }
1103 } else if (((li->extLength >> 30) ==
1104 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1105 ((lip1->extLength >> 30) ==
1106 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1107 udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1108 ((li->extLength &
1109 UDF_EXTENT_LENGTH_MASK) +
1110 blocksize - 1) >> blocksize_bits);
1111 li->extLocation.logicalBlockNum = 0;
1112 li->extLocation.partitionReferenceNum = 0;
1113
1114 if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1115 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1116 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1117 lip1->extLength = (lip1->extLength -
1118 (li->extLength &
1119 UDF_EXTENT_LENGTH_MASK) +
1120 UDF_EXTENT_LENGTH_MASK) &
1121 ~(blocksize - 1);
1122 li->extLength = (li->extLength &
1123 UDF_EXTENT_FLAG_MASK) +
1124 (UDF_EXTENT_LENGTH_MASK + 1) -
1125 blocksize;
1126 } else {
1127 li->extLength = lip1->extLength +
1128 (((li->extLength &
1129 UDF_EXTENT_LENGTH_MASK) +
1130 blocksize - 1) & ~(blocksize - 1));
1131 if (*endnum > (i + 2))
1132 memmove(&laarr[i + 1], &laarr[i + 2],
1133 sizeof(struct long_ad) *
1134 (*endnum - (i + 2)));
1135 i--;
1136 (*endnum)--;
1137 }
1138 } else if ((li->extLength >> 30) ==
1139 (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1140 udf_free_blocks(inode->i_sb, inode,
1141 &li->extLocation, 0,
1142 ((li->extLength &
1143 UDF_EXTENT_LENGTH_MASK) +
1144 blocksize - 1) >> blocksize_bits);
1145 li->extLocation.logicalBlockNum = 0;
1146 li->extLocation.partitionReferenceNum = 0;
1147 li->extLength = (li->extLength &
1148 UDF_EXTENT_LENGTH_MASK) |
1149 EXT_NOT_RECORDED_NOT_ALLOCATED;
1150 }
1151 }
1152 }
1153
1154 static void udf_update_extents(struct inode *inode,
1155 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1156 int startnum, int endnum,
1157 struct extent_position *epos)
1158 {
1159 int start = 0, i;
1160 struct kernel_lb_addr tmploc;
1161 uint32_t tmplen;
1162
1163 if (startnum > endnum) {
1164 for (i = 0; i < (startnum - endnum); i++)
1165 udf_delete_aext(inode, *epos, laarr[i].extLocation,
1166 laarr[i].extLength);
1167 } else if (startnum < endnum) {
1168 for (i = 0; i < (endnum - startnum); i++) {
1169 udf_insert_aext(inode, *epos, laarr[i].extLocation,
1170 laarr[i].extLength);
1171 udf_next_aext(inode, epos, &laarr[i].extLocation,
1172 &laarr[i].extLength, 1);
1173 start++;
1174 }
1175 }
1176
1177 for (i = start; i < endnum; i++) {
1178 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1179 udf_write_aext(inode, epos, &laarr[i].extLocation,
1180 laarr[i].extLength, 1);
1181 }
1182 }
1183
1184 struct buffer_head *udf_bread(struct inode *inode, int block,
1185 int create, int *err)
1186 {
1187 struct buffer_head *bh = NULL;
1188
1189 bh = udf_getblk(inode, block, create, err);
1190 if (!bh)
1191 return NULL;
1192
1193 if (buffer_uptodate(bh))
1194 return bh;
1195
1196 ll_rw_block(READ, 1, &bh);
1197
1198 wait_on_buffer(bh);
1199 if (buffer_uptodate(bh))
1200 return bh;
1201
1202 brelse(bh);
1203 *err = -EIO;
1204 return NULL;
1205 }
1206
1207 int udf_setsize(struct inode *inode, loff_t newsize)
1208 {
1209 int err;
1210 struct udf_inode_info *iinfo;
1211 int bsize = 1 << inode->i_blkbits;
1212
1213 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1214 S_ISLNK(inode->i_mode)))
1215 return -EINVAL;
1216 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1217 return -EPERM;
1218
1219 iinfo = UDF_I(inode);
1220 if (newsize > inode->i_size) {
1221 down_write(&iinfo->i_data_sem);
1222 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1223 if (bsize <
1224 (udf_file_entry_alloc_offset(inode) + newsize)) {
1225 err = udf_expand_file_adinicb(inode);
1226 if (err)
1227 return err;
1228 down_write(&iinfo->i_data_sem);
1229 } else {
1230 iinfo->i_lenAlloc = newsize;
1231 goto set_size;
1232 }
1233 }
1234 err = udf_extend_file(inode, newsize);
1235 if (err) {
1236 up_write(&iinfo->i_data_sem);
1237 return err;
1238 }
1239 set_size:
1240 truncate_setsize(inode, newsize);
1241 up_write(&iinfo->i_data_sem);
1242 } else {
1243 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1244 down_write(&iinfo->i_data_sem);
1245 udf_clear_extent_cache(inode);
1246 memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1247 0x00, bsize - newsize -
1248 udf_file_entry_alloc_offset(inode));
1249 iinfo->i_lenAlloc = newsize;
1250 truncate_setsize(inode, newsize);
1251 up_write(&iinfo->i_data_sem);
1252 goto update_time;
1253 }
1254 err = block_truncate_page(inode->i_mapping, newsize,
1255 udf_get_block);
1256 if (err)
1257 return err;
1258 down_write(&iinfo->i_data_sem);
1259 udf_clear_extent_cache(inode);
1260 truncate_setsize(inode, newsize);
1261 udf_truncate_extents(inode);
1262 up_write(&iinfo->i_data_sem);
1263 }
1264 update_time:
1265 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1266 if (IS_SYNC(inode))
1267 udf_sync_inode(inode);
1268 else
1269 mark_inode_dirty(inode);
1270 return 0;
1271 }
1272
1273 static void __udf_read_inode(struct inode *inode)
1274 {
1275 struct buffer_head *bh = NULL;
1276 struct fileEntry *fe;
1277 uint16_t ident;
1278 struct udf_inode_info *iinfo = UDF_I(inode);
1279
1280 /*
1281 * Set defaults, but the inode is still incomplete!
1282 * Note: get_new_inode() sets the following on a new inode:
1283 * i_sb = sb
1284 * i_no = ino
1285 * i_flags = sb->s_flags
1286 * i_state = 0
1287 * clean_inode(): zero fills and sets
1288 * i_count = 1
1289 * i_nlink = 1
1290 * i_op = NULL;
1291 */
1292 bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1293 if (!bh) {
1294 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1295 make_bad_inode(inode);
1296 return;
1297 }
1298
1299 if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1300 ident != TAG_IDENT_USE) {
1301 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1302 inode->i_ino, ident);
1303 brelse(bh);
1304 make_bad_inode(inode);
1305 return;
1306 }
1307
1308 fe = (struct fileEntry *)bh->b_data;
1309
1310 if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1311 struct buffer_head *ibh;
1312
1313 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1314 &ident);
1315 if (ident == TAG_IDENT_IE && ibh) {
1316 struct buffer_head *nbh = NULL;
1317 struct kernel_lb_addr loc;
1318 struct indirectEntry *ie;
1319
1320 ie = (struct indirectEntry *)ibh->b_data;
1321 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1322
1323 if (ie->indirectICB.extLength &&
1324 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1325 &ident))) {
1326 if (ident == TAG_IDENT_FE ||
1327 ident == TAG_IDENT_EFE) {
1328 memcpy(&iinfo->i_location,
1329 &loc,
1330 sizeof(struct kernel_lb_addr));
1331 brelse(bh);
1332 brelse(ibh);
1333 brelse(nbh);
1334 __udf_read_inode(inode);
1335 return;
1336 }
1337 brelse(nbh);
1338 }
1339 }
1340 brelse(ibh);
1341 } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1342 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1343 le16_to_cpu(fe->icbTag.strategyType));
1344 brelse(bh);
1345 make_bad_inode(inode);
1346 return;
1347 }
1348 udf_fill_inode(inode, bh);
1349
1350 brelse(bh);
1351 }
1352
1353 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1354 {
1355 struct fileEntry *fe;
1356 struct extendedFileEntry *efe;
1357 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1358 struct udf_inode_info *iinfo = UDF_I(inode);
1359 unsigned int link_count;
1360
1361 fe = (struct fileEntry *)bh->b_data;
1362 efe = (struct extendedFileEntry *)bh->b_data;
1363
1364 if (fe->icbTag.strategyType == cpu_to_le16(4))
1365 iinfo->i_strat4096 = 0;
1366 else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1367 iinfo->i_strat4096 = 1;
1368
1369 iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1370 ICBTAG_FLAG_AD_MASK;
1371 iinfo->i_unique = 0;
1372 iinfo->i_lenEAttr = 0;
1373 iinfo->i_lenExtents = 0;
1374 iinfo->i_lenAlloc = 0;
1375 iinfo->i_next_alloc_block = 0;
1376 iinfo->i_next_alloc_goal = 0;
1377 if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1378 iinfo->i_efe = 1;
1379 iinfo->i_use = 0;
1380 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1381 sizeof(struct extendedFileEntry))) {
1382 make_bad_inode(inode);
1383 return;
1384 }
1385 memcpy(iinfo->i_ext.i_data,
1386 bh->b_data + sizeof(struct extendedFileEntry),
1387 inode->i_sb->s_blocksize -
1388 sizeof(struct extendedFileEntry));
1389 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1390 iinfo->i_efe = 0;
1391 iinfo->i_use = 0;
1392 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1393 sizeof(struct fileEntry))) {
1394 make_bad_inode(inode);
1395 return;
1396 }
1397 memcpy(iinfo->i_ext.i_data,
1398 bh->b_data + sizeof(struct fileEntry),
1399 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1400 } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1401 iinfo->i_efe = 0;
1402 iinfo->i_use = 1;
1403 iinfo->i_lenAlloc = le32_to_cpu(
1404 ((struct unallocSpaceEntry *)bh->b_data)->
1405 lengthAllocDescs);
1406 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1407 sizeof(struct unallocSpaceEntry))) {
1408 make_bad_inode(inode);
1409 return;
1410 }
1411 memcpy(iinfo->i_ext.i_data,
1412 bh->b_data + sizeof(struct unallocSpaceEntry),
1413 inode->i_sb->s_blocksize -
1414 sizeof(struct unallocSpaceEntry));
1415 return;
1416 }
1417
1418 read_lock(&sbi->s_cred_lock);
1419 i_uid_write(inode, le32_to_cpu(fe->uid));
1420 if (!uid_valid(inode->i_uid) ||
1421 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1422 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1423 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1424
1425 i_gid_write(inode, le32_to_cpu(fe->gid));
1426 if (!gid_valid(inode->i_gid) ||
1427 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1428 UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1429 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1430
1431 if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1432 sbi->s_fmode != UDF_INVALID_MODE)
1433 inode->i_mode = sbi->s_fmode;
1434 else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1435 sbi->s_dmode != UDF_INVALID_MODE)
1436 inode->i_mode = sbi->s_dmode;
1437 else
1438 inode->i_mode = udf_convert_permissions(fe);
1439 inode->i_mode &= ~sbi->s_umask;
1440 read_unlock(&sbi->s_cred_lock);
1441
1442 link_count = le16_to_cpu(fe->fileLinkCount);
1443 if (!link_count)
1444 link_count = 1;
1445 set_nlink(inode, link_count);
1446
1447 inode->i_size = le64_to_cpu(fe->informationLength);
1448 iinfo->i_lenExtents = inode->i_size;
1449
1450 if (iinfo->i_efe == 0) {
1451 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1452 (inode->i_sb->s_blocksize_bits - 9);
1453
1454 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1455 inode->i_atime = sbi->s_record_time;
1456
1457 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1458 fe->modificationTime))
1459 inode->i_mtime = sbi->s_record_time;
1460
1461 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1462 inode->i_ctime = sbi->s_record_time;
1463
1464 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1465 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1466 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1467 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1468 } else {
1469 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1470 (inode->i_sb->s_blocksize_bits - 9);
1471
1472 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1473 inode->i_atime = sbi->s_record_time;
1474
1475 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1476 efe->modificationTime))
1477 inode->i_mtime = sbi->s_record_time;
1478
1479 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1480 iinfo->i_crtime = sbi->s_record_time;
1481
1482 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1483 inode->i_ctime = sbi->s_record_time;
1484
1485 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1486 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1487 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1488 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1489 }
1490
1491 switch (fe->icbTag.fileType) {
1492 case ICBTAG_FILE_TYPE_DIRECTORY:
1493 inode->i_op = &udf_dir_inode_operations;
1494 inode->i_fop = &udf_dir_operations;
1495 inode->i_mode |= S_IFDIR;
1496 inc_nlink(inode);
1497 break;
1498 case ICBTAG_FILE_TYPE_REALTIME:
1499 case ICBTAG_FILE_TYPE_REGULAR:
1500 case ICBTAG_FILE_TYPE_UNDEF:
1501 case ICBTAG_FILE_TYPE_VAT20:
1502 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1503 inode->i_data.a_ops = &udf_adinicb_aops;
1504 else
1505 inode->i_data.a_ops = &udf_aops;
1506 inode->i_op = &udf_file_inode_operations;
1507 inode->i_fop = &udf_file_operations;
1508 inode->i_mode |= S_IFREG;
1509 break;
1510 case ICBTAG_FILE_TYPE_BLOCK:
1511 inode->i_mode |= S_IFBLK;
1512 break;
1513 case ICBTAG_FILE_TYPE_CHAR:
1514 inode->i_mode |= S_IFCHR;
1515 break;
1516 case ICBTAG_FILE_TYPE_FIFO:
1517 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1518 break;
1519 case ICBTAG_FILE_TYPE_SOCKET:
1520 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1521 break;
1522 case ICBTAG_FILE_TYPE_SYMLINK:
1523 inode->i_data.a_ops = &udf_symlink_aops;
1524 inode->i_op = &udf_symlink_inode_operations;
1525 inode->i_mode = S_IFLNK | S_IRWXUGO;
1526 break;
1527 case ICBTAG_FILE_TYPE_MAIN:
1528 udf_debug("METADATA FILE-----\n");
1529 break;
1530 case ICBTAG_FILE_TYPE_MIRROR:
1531 udf_debug("METADATA MIRROR FILE-----\n");
1532 break;
1533 case ICBTAG_FILE_TYPE_BITMAP:
1534 udf_debug("METADATA BITMAP FILE-----\n");
1535 break;
1536 default:
1537 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1538 inode->i_ino, fe->icbTag.fileType);
1539 make_bad_inode(inode);
1540 return;
1541 }
1542 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1543 struct deviceSpec *dsea =
1544 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1545 if (dsea) {
1546 init_special_inode(inode, inode->i_mode,
1547 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1548 le32_to_cpu(dsea->minorDeviceIdent)));
1549 /* Developer ID ??? */
1550 } else
1551 make_bad_inode(inode);
1552 }
1553 }
1554
1555 static int udf_alloc_i_data(struct inode *inode, size_t size)
1556 {
1557 struct udf_inode_info *iinfo = UDF_I(inode);
1558 iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1559
1560 if (!iinfo->i_ext.i_data) {
1561 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1562 inode->i_ino);
1563 return -ENOMEM;
1564 }
1565
1566 return 0;
1567 }
1568
1569 static umode_t udf_convert_permissions(struct fileEntry *fe)
1570 {
1571 umode_t mode;
1572 uint32_t permissions;
1573 uint32_t flags;
1574
1575 permissions = le32_to_cpu(fe->permissions);
1576 flags = le16_to_cpu(fe->icbTag.flags);
1577
1578 mode = ((permissions) & S_IRWXO) |
1579 ((permissions >> 2) & S_IRWXG) |
1580 ((permissions >> 4) & S_IRWXU) |
1581 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1582 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1583 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1584
1585 return mode;
1586 }
1587
1588 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1589 {
1590 return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1591 }
1592
1593 static int udf_sync_inode(struct inode *inode)
1594 {
1595 return udf_update_inode(inode, 1);
1596 }
1597
1598 static int udf_update_inode(struct inode *inode, int do_sync)
1599 {
1600 struct buffer_head *bh = NULL;
1601 struct fileEntry *fe;
1602 struct extendedFileEntry *efe;
1603 uint64_t lb_recorded;
1604 uint32_t udfperms;
1605 uint16_t icbflags;
1606 uint16_t crclen;
1607 int err = 0;
1608 struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1609 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1610 struct udf_inode_info *iinfo = UDF_I(inode);
1611
1612 bh = udf_tgetblk(inode->i_sb,
1613 udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1614 if (!bh) {
1615 udf_debug("getblk failure\n");
1616 return -ENOMEM;
1617 }
1618
1619 lock_buffer(bh);
1620 memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1621 fe = (struct fileEntry *)bh->b_data;
1622 efe = (struct extendedFileEntry *)bh->b_data;
1623
1624 if (iinfo->i_use) {
1625 struct unallocSpaceEntry *use =
1626 (struct unallocSpaceEntry *)bh->b_data;
1627
1628 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1629 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1630 iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1631 sizeof(struct unallocSpaceEntry));
1632 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1633 use->descTag.tagLocation =
1634 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1635 crclen = sizeof(struct unallocSpaceEntry) +
1636 iinfo->i_lenAlloc - sizeof(struct tag);
1637 use->descTag.descCRCLength = cpu_to_le16(crclen);
1638 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1639 sizeof(struct tag),
1640 crclen));
1641 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1642
1643 goto out;
1644 }
1645
1646 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1647 fe->uid = cpu_to_le32(-1);
1648 else
1649 fe->uid = cpu_to_le32(i_uid_read(inode));
1650
1651 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1652 fe->gid = cpu_to_le32(-1);
1653 else
1654 fe->gid = cpu_to_le32(i_gid_read(inode));
1655
1656 udfperms = ((inode->i_mode & S_IRWXO)) |
1657 ((inode->i_mode & S_IRWXG) << 2) |
1658 ((inode->i_mode & S_IRWXU) << 4);
1659
1660 udfperms |= (le32_to_cpu(fe->permissions) &
1661 (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1662 FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1663 FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1664 fe->permissions = cpu_to_le32(udfperms);
1665
1666 if (S_ISDIR(inode->i_mode))
1667 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1668 else
1669 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1670
1671 fe->informationLength = cpu_to_le64(inode->i_size);
1672
1673 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1674 struct regid *eid;
1675 struct deviceSpec *dsea =
1676 (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1677 if (!dsea) {
1678 dsea = (struct deviceSpec *)
1679 udf_add_extendedattr(inode,
1680 sizeof(struct deviceSpec) +
1681 sizeof(struct regid), 12, 0x3);
1682 dsea->attrType = cpu_to_le32(12);
1683 dsea->attrSubtype = 1;
1684 dsea->attrLength = cpu_to_le32(
1685 sizeof(struct deviceSpec) +
1686 sizeof(struct regid));
1687 dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1688 }
1689 eid = (struct regid *)dsea->impUse;
1690 memset(eid, 0, sizeof(struct regid));
1691 strcpy(eid->ident, UDF_ID_DEVELOPER);
1692 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1693 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1694 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1695 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1696 }
1697
1698 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1699 lb_recorded = 0; /* No extents => no blocks! */
1700 else
1701 lb_recorded =
1702 (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1703 (blocksize_bits - 9);
1704
1705 if (iinfo->i_efe == 0) {
1706 memcpy(bh->b_data + sizeof(struct fileEntry),
1707 iinfo->i_ext.i_data,
1708 inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1709 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1710
1711 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1712 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1713 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1714 memset(&(fe->impIdent), 0, sizeof(struct regid));
1715 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1716 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1717 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1718 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1719 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1720 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1721 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1722 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1723 crclen = sizeof(struct fileEntry);
1724 } else {
1725 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1726 iinfo->i_ext.i_data,
1727 inode->i_sb->s_blocksize -
1728 sizeof(struct extendedFileEntry));
1729 efe->objectSize = cpu_to_le64(inode->i_size);
1730 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1731
1732 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1733 (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1734 iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1735 iinfo->i_crtime = inode->i_atime;
1736
1737 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1738 (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1739 iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1740 iinfo->i_crtime = inode->i_mtime;
1741
1742 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1743 (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1744 iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1745 iinfo->i_crtime = inode->i_ctime;
1746
1747 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1748 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1749 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1750 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1751
1752 memset(&(efe->impIdent), 0, sizeof(struct regid));
1753 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1754 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1755 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1756 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1757 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1758 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1759 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1760 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1761 crclen = sizeof(struct extendedFileEntry);
1762 }
1763 if (iinfo->i_strat4096) {
1764 fe->icbTag.strategyType = cpu_to_le16(4096);
1765 fe->icbTag.strategyParameter = cpu_to_le16(1);
1766 fe->icbTag.numEntries = cpu_to_le16(2);
1767 } else {
1768 fe->icbTag.strategyType = cpu_to_le16(4);
1769 fe->icbTag.numEntries = cpu_to_le16(1);
1770 }
1771
1772 if (S_ISDIR(inode->i_mode))
1773 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1774 else if (S_ISREG(inode->i_mode))
1775 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1776 else if (S_ISLNK(inode->i_mode))
1777 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1778 else if (S_ISBLK(inode->i_mode))
1779 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1780 else if (S_ISCHR(inode->i_mode))
1781 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1782 else if (S_ISFIFO(inode->i_mode))
1783 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1784 else if (S_ISSOCK(inode->i_mode))
1785 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1786
1787 icbflags = iinfo->i_alloc_type |
1788 ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1789 ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1790 ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1791 (le16_to_cpu(fe->icbTag.flags) &
1792 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1793 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1794
1795 fe->icbTag.flags = cpu_to_le16(icbflags);
1796 if (sbi->s_udfrev >= 0x0200)
1797 fe->descTag.descVersion = cpu_to_le16(3);
1798 else
1799 fe->descTag.descVersion = cpu_to_le16(2);
1800 fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1801 fe->descTag.tagLocation = cpu_to_le32(
1802 iinfo->i_location.logicalBlockNum);
1803 crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1804 fe->descTag.descCRCLength = cpu_to_le16(crclen);
1805 fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1806 crclen));
1807 fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1808
1809 out:
1810 set_buffer_uptodate(bh);
1811 unlock_buffer(bh);
1812
1813 /* write the data blocks */
1814 mark_buffer_dirty(bh);
1815 if (do_sync) {
1816 sync_dirty_buffer(bh);
1817 if (buffer_write_io_error(bh)) {
1818 udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1819 inode->i_ino);
1820 err = -EIO;
1821 }
1822 }
1823 brelse(bh);
1824
1825 return err;
1826 }
1827
1828 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1829 {
1830 unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1831 struct inode *inode = iget_locked(sb, block);
1832
1833 if (!inode)
1834 return NULL;
1835
1836 if (inode->i_state & I_NEW) {
1837 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1838 __udf_read_inode(inode);
1839 unlock_new_inode(inode);
1840 }
1841
1842 if (is_bad_inode(inode))
1843 goto out_iput;
1844
1845 if (ino->logicalBlockNum >= UDF_SB(sb)->
1846 s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1847 udf_debug("block=%d, partition=%d out of range\n",
1848 ino->logicalBlockNum, ino->partitionReferenceNum);
1849 make_bad_inode(inode);
1850 goto out_iput;
1851 }
1852
1853 return inode;
1854
1855 out_iput:
1856 iput(inode);
1857 return NULL;
1858 }
1859
1860 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1861 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1862 {
1863 int adsize;
1864 struct short_ad *sad = NULL;
1865 struct long_ad *lad = NULL;
1866 struct allocExtDesc *aed;
1867 uint8_t *ptr;
1868 struct udf_inode_info *iinfo = UDF_I(inode);
1869
1870 if (!epos->bh)
1871 ptr = iinfo->i_ext.i_data + epos->offset -
1872 udf_file_entry_alloc_offset(inode) +
1873 iinfo->i_lenEAttr;
1874 else
1875 ptr = epos->bh->b_data + epos->offset;
1876
1877 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1878 adsize = sizeof(struct short_ad);
1879 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1880 adsize = sizeof(struct long_ad);
1881 else
1882 return -EIO;
1883
1884 if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1885 unsigned char *sptr, *dptr;
1886 struct buffer_head *nbh;
1887 int err, loffset;
1888 struct kernel_lb_addr obloc = epos->block;
1889
1890 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1891 obloc.partitionReferenceNum,
1892 obloc.logicalBlockNum, &err);
1893 if (!epos->block.logicalBlockNum)
1894 return -ENOSPC;
1895 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1896 &epos->block,
1897 0));
1898 if (!nbh)
1899 return -EIO;
1900 lock_buffer(nbh);
1901 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1902 set_buffer_uptodate(nbh);
1903 unlock_buffer(nbh);
1904 mark_buffer_dirty_inode(nbh, inode);
1905
1906 aed = (struct allocExtDesc *)(nbh->b_data);
1907 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1908 aed->previousAllocExtLocation =
1909 cpu_to_le32(obloc.logicalBlockNum);
1910 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1911 loffset = epos->offset;
1912 aed->lengthAllocDescs = cpu_to_le32(adsize);
1913 sptr = ptr - adsize;
1914 dptr = nbh->b_data + sizeof(struct allocExtDesc);
1915 memcpy(dptr, sptr, adsize);
1916 epos->offset = sizeof(struct allocExtDesc) + adsize;
1917 } else {
1918 loffset = epos->offset + adsize;
1919 aed->lengthAllocDescs = cpu_to_le32(0);
1920 sptr = ptr;
1921 epos->offset = sizeof(struct allocExtDesc);
1922
1923 if (epos->bh) {
1924 aed = (struct allocExtDesc *)epos->bh->b_data;
1925 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1926 } else {
1927 iinfo->i_lenAlloc += adsize;
1928 mark_inode_dirty(inode);
1929 }
1930 }
1931 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1932 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1933 epos->block.logicalBlockNum, sizeof(struct tag));
1934 else
1935 udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1936 epos->block.logicalBlockNum, sizeof(struct tag));
1937 switch (iinfo->i_alloc_type) {
1938 case ICBTAG_FLAG_AD_SHORT:
1939 sad = (struct short_ad *)sptr;
1940 sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1941 inode->i_sb->s_blocksize);
1942 sad->extPosition =
1943 cpu_to_le32(epos->block.logicalBlockNum);
1944 break;
1945 case ICBTAG_FLAG_AD_LONG:
1946 lad = (struct long_ad *)sptr;
1947 lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1948 inode->i_sb->s_blocksize);
1949 lad->extLocation = cpu_to_lelb(epos->block);
1950 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1951 break;
1952 }
1953 if (epos->bh) {
1954 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1955 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1956 udf_update_tag(epos->bh->b_data, loffset);
1957 else
1958 udf_update_tag(epos->bh->b_data,
1959 sizeof(struct allocExtDesc));
1960 mark_buffer_dirty_inode(epos->bh, inode);
1961 brelse(epos->bh);
1962 } else {
1963 mark_inode_dirty(inode);
1964 }
1965 epos->bh = nbh;
1966 }
1967
1968 udf_write_aext(inode, epos, eloc, elen, inc);
1969
1970 if (!epos->bh) {
1971 iinfo->i_lenAlloc += adsize;
1972 mark_inode_dirty(inode);
1973 } else {
1974 aed = (struct allocExtDesc *)epos->bh->b_data;
1975 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1976 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1977 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1978 udf_update_tag(epos->bh->b_data,
1979 epos->offset + (inc ? 0 : adsize));
1980 else
1981 udf_update_tag(epos->bh->b_data,
1982 sizeof(struct allocExtDesc));
1983 mark_buffer_dirty_inode(epos->bh, inode);
1984 }
1985
1986 return 0;
1987 }
1988
1989 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1990 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1991 {
1992 int adsize;
1993 uint8_t *ptr;
1994 struct short_ad *sad;
1995 struct long_ad *lad;
1996 struct udf_inode_info *iinfo = UDF_I(inode);
1997
1998 if (!epos->bh)
1999 ptr = iinfo->i_ext.i_data + epos->offset -
2000 udf_file_entry_alloc_offset(inode) +
2001 iinfo->i_lenEAttr;
2002 else
2003 ptr = epos->bh->b_data + epos->offset;
2004
2005 switch (iinfo->i_alloc_type) {
2006 case ICBTAG_FLAG_AD_SHORT:
2007 sad = (struct short_ad *)ptr;
2008 sad->extLength = cpu_to_le32(elen);
2009 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2010 adsize = sizeof(struct short_ad);
2011 break;
2012 case ICBTAG_FLAG_AD_LONG:
2013 lad = (struct long_ad *)ptr;
2014 lad->extLength = cpu_to_le32(elen);
2015 lad->extLocation = cpu_to_lelb(*eloc);
2016 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2017 adsize = sizeof(struct long_ad);
2018 break;
2019 default:
2020 return;
2021 }
2022
2023 if (epos->bh) {
2024 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2025 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2026 struct allocExtDesc *aed =
2027 (struct allocExtDesc *)epos->bh->b_data;
2028 udf_update_tag(epos->bh->b_data,
2029 le32_to_cpu(aed->lengthAllocDescs) +
2030 sizeof(struct allocExtDesc));
2031 }
2032 mark_buffer_dirty_inode(epos->bh, inode);
2033 } else {
2034 mark_inode_dirty(inode);
2035 }
2036
2037 if (inc)
2038 epos->offset += adsize;
2039 }
2040
2041 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2042 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2043 {
2044 int8_t etype;
2045
2046 while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2047 (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2048 int block;
2049 epos->block = *eloc;
2050 epos->offset = sizeof(struct allocExtDesc);
2051 brelse(epos->bh);
2052 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2053 epos->bh = udf_tread(inode->i_sb, block);
2054 if (!epos->bh) {
2055 udf_debug("reading block %d failed!\n", block);
2056 return -1;
2057 }
2058 }
2059
2060 return etype;
2061 }
2062
2063 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2064 struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2065 {
2066 int alen;
2067 int8_t etype;
2068 uint8_t *ptr;
2069 struct short_ad *sad;
2070 struct long_ad *lad;
2071 struct udf_inode_info *iinfo = UDF_I(inode);
2072
2073 if (!epos->bh) {
2074 if (!epos->offset)
2075 epos->offset = udf_file_entry_alloc_offset(inode);
2076 ptr = iinfo->i_ext.i_data + epos->offset -
2077 udf_file_entry_alloc_offset(inode) +
2078 iinfo->i_lenEAttr;
2079 alen = udf_file_entry_alloc_offset(inode) +
2080 iinfo->i_lenAlloc;
2081 } else {
2082 if (!epos->offset)
2083 epos->offset = sizeof(struct allocExtDesc);
2084 ptr = epos->bh->b_data + epos->offset;
2085 alen = sizeof(struct allocExtDesc) +
2086 le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2087 lengthAllocDescs);
2088 }
2089
2090 switch (iinfo->i_alloc_type) {
2091 case ICBTAG_FLAG_AD_SHORT:
2092 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2093 if (!sad)
2094 return -1;
2095 etype = le32_to_cpu(sad->extLength) >> 30;
2096 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2097 eloc->partitionReferenceNum =
2098 iinfo->i_location.partitionReferenceNum;
2099 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2100 break;
2101 case ICBTAG_FLAG_AD_LONG:
2102 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2103 if (!lad)
2104 return -1;
2105 etype = le32_to_cpu(lad->extLength) >> 30;
2106 *eloc = lelb_to_cpu(lad->extLocation);
2107 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2108 break;
2109 default:
2110 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2111 return -1;
2112 }
2113
2114 return etype;
2115 }
2116
2117 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2118 struct kernel_lb_addr neloc, uint32_t nelen)
2119 {
2120 struct kernel_lb_addr oeloc;
2121 uint32_t oelen;
2122 int8_t etype;
2123
2124 if (epos.bh)
2125 get_bh(epos.bh);
2126
2127 while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2128 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2129 neloc = oeloc;
2130 nelen = (etype << 30) | oelen;
2131 }
2132 udf_add_aext(inode, &epos, &neloc, nelen, 1);
2133 brelse(epos.bh);
2134
2135 return (nelen >> 30);
2136 }
2137
2138 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2139 struct kernel_lb_addr eloc, uint32_t elen)
2140 {
2141 struct extent_position oepos;
2142 int adsize;
2143 int8_t etype;
2144 struct allocExtDesc *aed;
2145 struct udf_inode_info *iinfo;
2146
2147 if (epos.bh) {
2148 get_bh(epos.bh);
2149 get_bh(epos.bh);
2150 }
2151
2152 iinfo = UDF_I(inode);
2153 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2154 adsize = sizeof(struct short_ad);
2155 else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2156 adsize = sizeof(struct long_ad);
2157 else
2158 adsize = 0;
2159
2160 oepos = epos;
2161 if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2162 return -1;
2163
2164 while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2165 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2166 if (oepos.bh != epos.bh) {
2167 oepos.block = epos.block;
2168 brelse(oepos.bh);
2169 get_bh(epos.bh);
2170 oepos.bh = epos.bh;
2171 oepos.offset = epos.offset - adsize;
2172 }
2173 }
2174 memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2175 elen = 0;
2176
2177 if (epos.bh != oepos.bh) {
2178 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2179 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2180 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2181 if (!oepos.bh) {
2182 iinfo->i_lenAlloc -= (adsize * 2);
2183 mark_inode_dirty(inode);
2184 } else {
2185 aed = (struct allocExtDesc *)oepos.bh->b_data;
2186 le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2187 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2188 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2189 udf_update_tag(oepos.bh->b_data,
2190 oepos.offset - (2 * adsize));
2191 else
2192 udf_update_tag(oepos.bh->b_data,
2193 sizeof(struct allocExtDesc));
2194 mark_buffer_dirty_inode(oepos.bh, inode);
2195 }
2196 } else {
2197 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2198 if (!oepos.bh) {
2199 iinfo->i_lenAlloc -= adsize;
2200 mark_inode_dirty(inode);
2201 } else {
2202 aed = (struct allocExtDesc *)oepos.bh->b_data;
2203 le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2204 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2205 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2206 udf_update_tag(oepos.bh->b_data,
2207 epos.offset - adsize);
2208 else
2209 udf_update_tag(oepos.bh->b_data,
2210 sizeof(struct allocExtDesc));
2211 mark_buffer_dirty_inode(oepos.bh, inode);
2212 }
2213 }
2214
2215 brelse(epos.bh);
2216 brelse(oepos.bh);
2217
2218 return (elen >> 30);
2219 }
2220
2221 int8_t inode_bmap(struct inode *inode, sector_t block,
2222 struct extent_position *pos, struct kernel_lb_addr *eloc,
2223 uint32_t *elen, sector_t *offset)
2224 {
2225 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2226 loff_t lbcount = 0, bcount =
2227 (loff_t) block << blocksize_bits;
2228 int8_t etype;
2229 struct udf_inode_info *iinfo;
2230
2231 iinfo = UDF_I(inode);
2232 if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2233 pos->offset = 0;
2234 pos->block = iinfo->i_location;
2235 pos->bh = NULL;
2236 }
2237 *elen = 0;
2238 do {
2239 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2240 if (etype == -1) {
2241 *offset = (bcount - lbcount) >> blocksize_bits;
2242 iinfo->i_lenExtents = lbcount;
2243 return -1;
2244 }
2245 lbcount += *elen;
2246 } while (lbcount <= bcount);
2247 /* update extent cache */
2248 udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2249 *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2250
2251 return etype;
2252 }
2253
2254 long udf_block_map(struct inode *inode, sector_t block)
2255 {
2256 struct kernel_lb_addr eloc;
2257 uint32_t elen;
2258 sector_t offset;
2259 struct extent_position epos = {};
2260 int ret;
2261
2262 down_read(&UDF_I(inode)->i_data_sem);
2263
2264 if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2265 (EXT_RECORDED_ALLOCATED >> 30))
2266 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2267 else
2268 ret = 0;
2269
2270 up_read(&UDF_I(inode)->i_data_sem);
2271 brelse(epos.bh);
2272
2273 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2274 return udf_fixed_to_variable(ret);
2275 else
2276 return ret;
2277 }
Linus' kernel tree