xref: /openbmc/linux/fs/udf/inode.c (revision d2999e1b)
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 	}
150 	truncate_inode_pages_final(&inode->i_data);
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 			     struct iov_iter *iter,
221 			     loff_t offset)
222 {
223 	struct file *file = iocb->ki_filp;
224 	struct address_space *mapping = file->f_mapping;
225 	struct inode *inode = mapping->host;
226 	size_t count = iov_iter_count(iter);
227 	ssize_t ret;
228 
229 	ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, udf_get_block);
230 	if (unlikely(ret < 0 && (rw & WRITE)))
231 		udf_write_failed(mapping, offset + count);
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 	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
269 	if (!iinfo->i_lenAlloc) {
270 		if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
271 			iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
272 		else
273 			iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
274 		/* from now on we have normal address_space methods */
275 		inode->i_data.a_ops = &udf_aops;
276 		up_write(&iinfo->i_data_sem);
277 		mark_inode_dirty(inode);
278 		return 0;
279 	}
280 	/*
281 	 * Release i_data_sem so that we can lock a page - page lock ranks
282 	 * above i_data_sem. i_mutex still protects us against file changes.
283 	 */
284 	up_write(&iinfo->i_data_sem);
285 
286 	page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
287 	if (!page)
288 		return -ENOMEM;
289 
290 	if (!PageUptodate(page)) {
291 		kaddr = kmap(page);
292 		memset(kaddr + iinfo->i_lenAlloc, 0x00,
293 		       PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
294 		memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
295 			iinfo->i_lenAlloc);
296 		flush_dcache_page(page);
297 		SetPageUptodate(page);
298 		kunmap(page);
299 	}
300 	down_write(&iinfo->i_data_sem);
301 	memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
302 	       iinfo->i_lenAlloc);
303 	iinfo->i_lenAlloc = 0;
304 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
305 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
306 	else
307 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
308 	/* from now on we have normal address_space methods */
309 	inode->i_data.a_ops = &udf_aops;
310 	up_write(&iinfo->i_data_sem);
311 	err = inode->i_data.a_ops->writepage(page, &udf_wbc);
312 	if (err) {
313 		/* Restore everything back so that we don't lose data... */
314 		lock_page(page);
315 		kaddr = kmap(page);
316 		down_write(&iinfo->i_data_sem);
317 		memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
318 		       inode->i_size);
319 		kunmap(page);
320 		unlock_page(page);
321 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
322 		inode->i_data.a_ops = &udf_adinicb_aops;
323 		up_write(&iinfo->i_data_sem);
324 	}
325 	page_cache_release(page);
326 	mark_inode_dirty(inode);
327 
328 	return err;
329 }
330 
331 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
332 					   int *err)
333 {
334 	int newblock;
335 	struct buffer_head *dbh = NULL;
336 	struct kernel_lb_addr eloc;
337 	uint8_t alloctype;
338 	struct extent_position epos;
339 
340 	struct udf_fileident_bh sfibh, dfibh;
341 	loff_t f_pos = udf_ext0_offset(inode);
342 	int size = udf_ext0_offset(inode) + inode->i_size;
343 	struct fileIdentDesc cfi, *sfi, *dfi;
344 	struct udf_inode_info *iinfo = UDF_I(inode);
345 
346 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
347 		alloctype = ICBTAG_FLAG_AD_SHORT;
348 	else
349 		alloctype = ICBTAG_FLAG_AD_LONG;
350 
351 	if (!inode->i_size) {
352 		iinfo->i_alloc_type = alloctype;
353 		mark_inode_dirty(inode);
354 		return NULL;
355 	}
356 
357 	/* alloc block, and copy data to it */
358 	*block = udf_new_block(inode->i_sb, inode,
359 			       iinfo->i_location.partitionReferenceNum,
360 			       iinfo->i_location.logicalBlockNum, err);
361 	if (!(*block))
362 		return NULL;
363 	newblock = udf_get_pblock(inode->i_sb, *block,
364 				  iinfo->i_location.partitionReferenceNum,
365 				0);
366 	if (!newblock)
367 		return NULL;
368 	dbh = udf_tgetblk(inode->i_sb, newblock);
369 	if (!dbh)
370 		return NULL;
371 	lock_buffer(dbh);
372 	memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
373 	set_buffer_uptodate(dbh);
374 	unlock_buffer(dbh);
375 	mark_buffer_dirty_inode(dbh, inode);
376 
377 	sfibh.soffset = sfibh.eoffset =
378 			f_pos & (inode->i_sb->s_blocksize - 1);
379 	sfibh.sbh = sfibh.ebh = NULL;
380 	dfibh.soffset = dfibh.eoffset = 0;
381 	dfibh.sbh = dfibh.ebh = dbh;
382 	while (f_pos < size) {
383 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
384 		sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
385 					 NULL, NULL, NULL);
386 		if (!sfi) {
387 			brelse(dbh);
388 			return NULL;
389 		}
390 		iinfo->i_alloc_type = alloctype;
391 		sfi->descTag.tagLocation = cpu_to_le32(*block);
392 		dfibh.soffset = dfibh.eoffset;
393 		dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
394 		dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
395 		if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
396 				 sfi->fileIdent +
397 					le16_to_cpu(sfi->lengthOfImpUse))) {
398 			iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
399 			brelse(dbh);
400 			return NULL;
401 		}
402 	}
403 	mark_buffer_dirty_inode(dbh, inode);
404 
405 	memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
406 		iinfo->i_lenAlloc);
407 	iinfo->i_lenAlloc = 0;
408 	eloc.logicalBlockNum = *block;
409 	eloc.partitionReferenceNum =
410 				iinfo->i_location.partitionReferenceNum;
411 	iinfo->i_lenExtents = inode->i_size;
412 	epos.bh = NULL;
413 	epos.block = iinfo->i_location;
414 	epos.offset = udf_file_entry_alloc_offset(inode);
415 	udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
416 	/* UniqueID stuff */
417 
418 	brelse(epos.bh);
419 	mark_inode_dirty(inode);
420 	return dbh;
421 }
422 
423 static int udf_get_block(struct inode *inode, sector_t block,
424 			 struct buffer_head *bh_result, int create)
425 {
426 	int err, new;
427 	sector_t phys = 0;
428 	struct udf_inode_info *iinfo;
429 
430 	if (!create) {
431 		phys = udf_block_map(inode, block);
432 		if (phys)
433 			map_bh(bh_result, inode->i_sb, phys);
434 		return 0;
435 	}
436 
437 	err = -EIO;
438 	new = 0;
439 	iinfo = UDF_I(inode);
440 
441 	down_write(&iinfo->i_data_sem);
442 	if (block == iinfo->i_next_alloc_block + 1) {
443 		iinfo->i_next_alloc_block++;
444 		iinfo->i_next_alloc_goal++;
445 	}
446 
447 	udf_clear_extent_cache(inode);
448 	phys = inode_getblk(inode, block, &err, &new);
449 	if (!phys)
450 		goto abort;
451 
452 	if (new)
453 		set_buffer_new(bh_result);
454 	map_bh(bh_result, inode->i_sb, phys);
455 
456 abort:
457 	up_write(&iinfo->i_data_sem);
458 	return err;
459 }
460 
461 static struct buffer_head *udf_getblk(struct inode *inode, long block,
462 				      int create, int *err)
463 {
464 	struct buffer_head *bh;
465 	struct buffer_head dummy;
466 
467 	dummy.b_state = 0;
468 	dummy.b_blocknr = -1000;
469 	*err = udf_get_block(inode, block, &dummy, create);
470 	if (!*err && buffer_mapped(&dummy)) {
471 		bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
472 		if (buffer_new(&dummy)) {
473 			lock_buffer(bh);
474 			memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
475 			set_buffer_uptodate(bh);
476 			unlock_buffer(bh);
477 			mark_buffer_dirty_inode(bh, inode);
478 		}
479 		return bh;
480 	}
481 
482 	return NULL;
483 }
484 
485 /* Extend the file by 'blocks' blocks, return the number of extents added */
486 static int udf_do_extend_file(struct inode *inode,
487 			      struct extent_position *last_pos,
488 			      struct kernel_long_ad *last_ext,
489 			      sector_t blocks)
490 {
491 	sector_t add;
492 	int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
493 	struct super_block *sb = inode->i_sb;
494 	struct kernel_lb_addr prealloc_loc = {};
495 	int prealloc_len = 0;
496 	struct udf_inode_info *iinfo;
497 	int err;
498 
499 	/* The previous extent is fake and we should not extend by anything
500 	 * - there's nothing to do... */
501 	if (!blocks && fake)
502 		return 0;
503 
504 	iinfo = UDF_I(inode);
505 	/* Round the last extent up to a multiple of block size */
506 	if (last_ext->extLength & (sb->s_blocksize - 1)) {
507 		last_ext->extLength =
508 			(last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
509 			(((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
510 			  sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
511 		iinfo->i_lenExtents =
512 			(iinfo->i_lenExtents + sb->s_blocksize - 1) &
513 			~(sb->s_blocksize - 1);
514 	}
515 
516 	/* Last extent are just preallocated blocks? */
517 	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
518 						EXT_NOT_RECORDED_ALLOCATED) {
519 		/* Save the extent so that we can reattach it to the end */
520 		prealloc_loc = last_ext->extLocation;
521 		prealloc_len = last_ext->extLength;
522 		/* Mark the extent as a hole */
523 		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
524 			(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
525 		last_ext->extLocation.logicalBlockNum = 0;
526 		last_ext->extLocation.partitionReferenceNum = 0;
527 	}
528 
529 	/* Can we merge with the previous extent? */
530 	if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
531 					EXT_NOT_RECORDED_NOT_ALLOCATED) {
532 		add = ((1 << 30) - sb->s_blocksize -
533 			(last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
534 			sb->s_blocksize_bits;
535 		if (add > blocks)
536 			add = blocks;
537 		blocks -= add;
538 		last_ext->extLength += add << sb->s_blocksize_bits;
539 	}
540 
541 	if (fake) {
542 		udf_add_aext(inode, last_pos, &last_ext->extLocation,
543 			     last_ext->extLength, 1);
544 		count++;
545 	} else
546 		udf_write_aext(inode, last_pos, &last_ext->extLocation,
547 				last_ext->extLength, 1);
548 
549 	/* Managed to do everything necessary? */
550 	if (!blocks)
551 		goto out;
552 
553 	/* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
554 	last_ext->extLocation.logicalBlockNum = 0;
555 	last_ext->extLocation.partitionReferenceNum = 0;
556 	add = (1 << (30-sb->s_blocksize_bits)) - 1;
557 	last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
558 				(add << sb->s_blocksize_bits);
559 
560 	/* Create enough extents to cover the whole hole */
561 	while (blocks > add) {
562 		blocks -= add;
563 		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
564 				   last_ext->extLength, 1);
565 		if (err)
566 			return err;
567 		count++;
568 	}
569 	if (blocks) {
570 		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
571 			(blocks << sb->s_blocksize_bits);
572 		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
573 				   last_ext->extLength, 1);
574 		if (err)
575 			return err;
576 		count++;
577 	}
578 
579 out:
580 	/* Do we have some preallocated blocks saved? */
581 	if (prealloc_len) {
582 		err = udf_add_aext(inode, last_pos, &prealloc_loc,
583 				   prealloc_len, 1);
584 		if (err)
585 			return err;
586 		last_ext->extLocation = prealloc_loc;
587 		last_ext->extLength = prealloc_len;
588 		count++;
589 	}
590 
591 	/* last_pos should point to the last written extent... */
592 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
593 		last_pos->offset -= sizeof(struct short_ad);
594 	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
595 		last_pos->offset -= sizeof(struct long_ad);
596 	else
597 		return -EIO;
598 
599 	return count;
600 }
601 
602 static int udf_extend_file(struct inode *inode, loff_t newsize)
603 {
604 
605 	struct extent_position epos;
606 	struct kernel_lb_addr eloc;
607 	uint32_t elen;
608 	int8_t etype;
609 	struct super_block *sb = inode->i_sb;
610 	sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
611 	int adsize;
612 	struct udf_inode_info *iinfo = UDF_I(inode);
613 	struct kernel_long_ad extent;
614 	int err;
615 
616 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
617 		adsize = sizeof(struct short_ad);
618 	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
619 		adsize = sizeof(struct long_ad);
620 	else
621 		BUG();
622 
623 	etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
624 
625 	/* File has extent covering the new size (could happen when extending
626 	 * inside a block)? */
627 	if (etype != -1)
628 		return 0;
629 	if (newsize & (sb->s_blocksize - 1))
630 		offset++;
631 	/* Extended file just to the boundary of the last file block? */
632 	if (offset == 0)
633 		return 0;
634 
635 	/* Truncate is extending the file by 'offset' blocks */
636 	if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
637 	    (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
638 		/* File has no extents at all or has empty last
639 		 * indirect extent! Create a fake extent... */
640 		extent.extLocation.logicalBlockNum = 0;
641 		extent.extLocation.partitionReferenceNum = 0;
642 		extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
643 	} else {
644 		epos.offset -= adsize;
645 		etype = udf_next_aext(inode, &epos, &extent.extLocation,
646 				      &extent.extLength, 0);
647 		extent.extLength |= etype << 30;
648 	}
649 	err = udf_do_extend_file(inode, &epos, &extent, offset);
650 	if (err < 0)
651 		goto out;
652 	err = 0;
653 	iinfo->i_lenExtents = newsize;
654 out:
655 	brelse(epos.bh);
656 	return err;
657 }
658 
659 static sector_t inode_getblk(struct inode *inode, sector_t block,
660 			     int *err, int *new)
661 {
662 	struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
663 	struct extent_position prev_epos, cur_epos, next_epos;
664 	int count = 0, startnum = 0, endnum = 0;
665 	uint32_t elen = 0, tmpelen;
666 	struct kernel_lb_addr eloc, tmpeloc;
667 	int c = 1;
668 	loff_t lbcount = 0, b_off = 0;
669 	uint32_t newblocknum, newblock;
670 	sector_t offset = 0;
671 	int8_t etype;
672 	struct udf_inode_info *iinfo = UDF_I(inode);
673 	int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
674 	int lastblock = 0;
675 	bool isBeyondEOF;
676 
677 	*err = 0;
678 	*new = 0;
679 	prev_epos.offset = udf_file_entry_alloc_offset(inode);
680 	prev_epos.block = iinfo->i_location;
681 	prev_epos.bh = NULL;
682 	cur_epos = next_epos = prev_epos;
683 	b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
684 
685 	/* find the extent which contains the block we are looking for.
686 	   alternate between laarr[0] and laarr[1] for locations of the
687 	   current extent, and the previous extent */
688 	do {
689 		if (prev_epos.bh != cur_epos.bh) {
690 			brelse(prev_epos.bh);
691 			get_bh(cur_epos.bh);
692 			prev_epos.bh = cur_epos.bh;
693 		}
694 		if (cur_epos.bh != next_epos.bh) {
695 			brelse(cur_epos.bh);
696 			get_bh(next_epos.bh);
697 			cur_epos.bh = next_epos.bh;
698 		}
699 
700 		lbcount += elen;
701 
702 		prev_epos.block = cur_epos.block;
703 		cur_epos.block = next_epos.block;
704 
705 		prev_epos.offset = cur_epos.offset;
706 		cur_epos.offset = next_epos.offset;
707 
708 		etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
709 		if (etype == -1)
710 			break;
711 
712 		c = !c;
713 
714 		laarr[c].extLength = (etype << 30) | elen;
715 		laarr[c].extLocation = eloc;
716 
717 		if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
718 			pgoal = eloc.logicalBlockNum +
719 				((elen + inode->i_sb->s_blocksize - 1) >>
720 				 inode->i_sb->s_blocksize_bits);
721 
722 		count++;
723 	} while (lbcount + elen <= b_off);
724 
725 	b_off -= lbcount;
726 	offset = b_off >> inode->i_sb->s_blocksize_bits;
727 	/*
728 	 * Move prev_epos and cur_epos into indirect extent if we are at
729 	 * the pointer to it
730 	 */
731 	udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
732 	udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
733 
734 	/* if the extent is allocated and recorded, return the block
735 	   if the extent is not a multiple of the blocksize, round up */
736 
737 	if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
738 		if (elen & (inode->i_sb->s_blocksize - 1)) {
739 			elen = EXT_RECORDED_ALLOCATED |
740 				((elen + inode->i_sb->s_blocksize - 1) &
741 				 ~(inode->i_sb->s_blocksize - 1));
742 			udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
743 		}
744 		brelse(prev_epos.bh);
745 		brelse(cur_epos.bh);
746 		brelse(next_epos.bh);
747 		newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
748 		return newblock;
749 	}
750 
751 	/* Are we beyond EOF? */
752 	if (etype == -1) {
753 		int ret;
754 		isBeyondEOF = 1;
755 		if (count) {
756 			if (c)
757 				laarr[0] = laarr[1];
758 			startnum = 1;
759 		} else {
760 			/* Create a fake extent when there's not one */
761 			memset(&laarr[0].extLocation, 0x00,
762 				sizeof(struct kernel_lb_addr));
763 			laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
764 			/* Will udf_do_extend_file() create real extent from
765 			   a fake one? */
766 			startnum = (offset > 0);
767 		}
768 		/* Create extents for the hole between EOF and offset */
769 		ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
770 		if (ret < 0) {
771 			brelse(prev_epos.bh);
772 			brelse(cur_epos.bh);
773 			brelse(next_epos.bh);
774 			*err = ret;
775 			return 0;
776 		}
777 		c = 0;
778 		offset = 0;
779 		count += ret;
780 		/* We are not covered by a preallocated extent? */
781 		if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
782 						EXT_NOT_RECORDED_ALLOCATED) {
783 			/* Is there any real extent? - otherwise we overwrite
784 			 * the fake one... */
785 			if (count)
786 				c = !c;
787 			laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
788 				inode->i_sb->s_blocksize;
789 			memset(&laarr[c].extLocation, 0x00,
790 				sizeof(struct kernel_lb_addr));
791 			count++;
792 		}
793 		endnum = c + 1;
794 		lastblock = 1;
795 	} else {
796 		isBeyondEOF = 0;
797 		endnum = startnum = ((count > 2) ? 2 : count);
798 
799 		/* if the current extent is in position 0,
800 		   swap it with the previous */
801 		if (!c && count != 1) {
802 			laarr[2] = laarr[0];
803 			laarr[0] = laarr[1];
804 			laarr[1] = laarr[2];
805 			c = 1;
806 		}
807 
808 		/* if the current block is located in an extent,
809 		   read the next extent */
810 		etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
811 		if (etype != -1) {
812 			laarr[c + 1].extLength = (etype << 30) | elen;
813 			laarr[c + 1].extLocation = eloc;
814 			count++;
815 			startnum++;
816 			endnum++;
817 		} else
818 			lastblock = 1;
819 	}
820 
821 	/* if the current extent is not recorded but allocated, get the
822 	 * block in the extent corresponding to the requested block */
823 	if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
824 		newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
825 	else { /* otherwise, allocate a new block */
826 		if (iinfo->i_next_alloc_block == block)
827 			goal = iinfo->i_next_alloc_goal;
828 
829 		if (!goal) {
830 			if (!(goal = pgoal)) /* XXX: what was intended here? */
831 				goal = iinfo->i_location.logicalBlockNum + 1;
832 		}
833 
834 		newblocknum = udf_new_block(inode->i_sb, inode,
835 				iinfo->i_location.partitionReferenceNum,
836 				goal, err);
837 		if (!newblocknum) {
838 			brelse(prev_epos.bh);
839 			brelse(cur_epos.bh);
840 			brelse(next_epos.bh);
841 			*err = -ENOSPC;
842 			return 0;
843 		}
844 		if (isBeyondEOF)
845 			iinfo->i_lenExtents += inode->i_sb->s_blocksize;
846 	}
847 
848 	/* if the extent the requsted block is located in contains multiple
849 	 * blocks, split the extent into at most three extents. blocks prior
850 	 * to requested block, requested block, and blocks after requested
851 	 * block */
852 	udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
853 
854 #ifdef UDF_PREALLOCATE
855 	/* We preallocate blocks only for regular files. It also makes sense
856 	 * for directories but there's a problem when to drop the
857 	 * preallocation. We might use some delayed work for that but I feel
858 	 * it's overengineering for a filesystem like UDF. */
859 	if (S_ISREG(inode->i_mode))
860 		udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
861 #endif
862 
863 	/* merge any continuous blocks in laarr */
864 	udf_merge_extents(inode, laarr, &endnum);
865 
866 	/* write back the new extents, inserting new extents if the new number
867 	 * of extents is greater than the old number, and deleting extents if
868 	 * the new number of extents is less than the old number */
869 	udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
870 
871 	brelse(prev_epos.bh);
872 	brelse(cur_epos.bh);
873 	brelse(next_epos.bh);
874 
875 	newblock = udf_get_pblock(inode->i_sb, newblocknum,
876 				iinfo->i_location.partitionReferenceNum, 0);
877 	if (!newblock) {
878 		*err = -EIO;
879 		return 0;
880 	}
881 	*new = 1;
882 	iinfo->i_next_alloc_block = block;
883 	iinfo->i_next_alloc_goal = newblocknum;
884 	inode->i_ctime = current_fs_time(inode->i_sb);
885 
886 	if (IS_SYNC(inode))
887 		udf_sync_inode(inode);
888 	else
889 		mark_inode_dirty(inode);
890 
891 	return newblock;
892 }
893 
894 static void udf_split_extents(struct inode *inode, int *c, int offset,
895 			      int newblocknum,
896 			      struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
897 			      int *endnum)
898 {
899 	unsigned long blocksize = inode->i_sb->s_blocksize;
900 	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
901 
902 	if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
903 	    (laarr[*c].extLength >> 30) ==
904 				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
905 		int curr = *c;
906 		int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
907 			    blocksize - 1) >> blocksize_bits;
908 		int8_t etype = (laarr[curr].extLength >> 30);
909 
910 		if (blen == 1)
911 			;
912 		else if (!offset || blen == offset + 1) {
913 			laarr[curr + 2] = laarr[curr + 1];
914 			laarr[curr + 1] = laarr[curr];
915 		} else {
916 			laarr[curr + 3] = laarr[curr + 1];
917 			laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
918 		}
919 
920 		if (offset) {
921 			if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
922 				udf_free_blocks(inode->i_sb, inode,
923 						&laarr[curr].extLocation,
924 						0, offset);
925 				laarr[curr].extLength =
926 					EXT_NOT_RECORDED_NOT_ALLOCATED |
927 					(offset << blocksize_bits);
928 				laarr[curr].extLocation.logicalBlockNum = 0;
929 				laarr[curr].extLocation.
930 						partitionReferenceNum = 0;
931 			} else
932 				laarr[curr].extLength = (etype << 30) |
933 					(offset << blocksize_bits);
934 			curr++;
935 			(*c)++;
936 			(*endnum)++;
937 		}
938 
939 		laarr[curr].extLocation.logicalBlockNum = newblocknum;
940 		if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
941 			laarr[curr].extLocation.partitionReferenceNum =
942 				UDF_I(inode)->i_location.partitionReferenceNum;
943 		laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
944 			blocksize;
945 		curr++;
946 
947 		if (blen != offset + 1) {
948 			if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
949 				laarr[curr].extLocation.logicalBlockNum +=
950 								offset + 1;
951 			laarr[curr].extLength = (etype << 30) |
952 				((blen - (offset + 1)) << blocksize_bits);
953 			curr++;
954 			(*endnum)++;
955 		}
956 	}
957 }
958 
959 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
960 				 struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
961 				 int *endnum)
962 {
963 	int start, length = 0, currlength = 0, i;
964 
965 	if (*endnum >= (c + 1)) {
966 		if (!lastblock)
967 			return;
968 		else
969 			start = c;
970 	} else {
971 		if ((laarr[c + 1].extLength >> 30) ==
972 					(EXT_NOT_RECORDED_ALLOCATED >> 30)) {
973 			start = c + 1;
974 			length = currlength =
975 				(((laarr[c + 1].extLength &
976 					UDF_EXTENT_LENGTH_MASK) +
977 				inode->i_sb->s_blocksize - 1) >>
978 				inode->i_sb->s_blocksize_bits);
979 		} else
980 			start = c;
981 	}
982 
983 	for (i = start + 1; i <= *endnum; i++) {
984 		if (i == *endnum) {
985 			if (lastblock)
986 				length += UDF_DEFAULT_PREALLOC_BLOCKS;
987 		} else if ((laarr[i].extLength >> 30) ==
988 				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
989 			length += (((laarr[i].extLength &
990 						UDF_EXTENT_LENGTH_MASK) +
991 				    inode->i_sb->s_blocksize - 1) >>
992 				    inode->i_sb->s_blocksize_bits);
993 		} else
994 			break;
995 	}
996 
997 	if (length) {
998 		int next = laarr[start].extLocation.logicalBlockNum +
999 			(((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1000 			  inode->i_sb->s_blocksize - 1) >>
1001 			  inode->i_sb->s_blocksize_bits);
1002 		int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1003 				laarr[start].extLocation.partitionReferenceNum,
1004 				next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1005 				length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1006 				currlength);
1007 		if (numalloc) 	{
1008 			if (start == (c + 1))
1009 				laarr[start].extLength +=
1010 					(numalloc <<
1011 					 inode->i_sb->s_blocksize_bits);
1012 			else {
1013 				memmove(&laarr[c + 2], &laarr[c + 1],
1014 					sizeof(struct long_ad) * (*endnum - (c + 1)));
1015 				(*endnum)++;
1016 				laarr[c + 1].extLocation.logicalBlockNum = next;
1017 				laarr[c + 1].extLocation.partitionReferenceNum =
1018 					laarr[c].extLocation.
1019 							partitionReferenceNum;
1020 				laarr[c + 1].extLength =
1021 					EXT_NOT_RECORDED_ALLOCATED |
1022 					(numalloc <<
1023 					 inode->i_sb->s_blocksize_bits);
1024 				start = c + 1;
1025 			}
1026 
1027 			for (i = start + 1; numalloc && i < *endnum; i++) {
1028 				int elen = ((laarr[i].extLength &
1029 						UDF_EXTENT_LENGTH_MASK) +
1030 					    inode->i_sb->s_blocksize - 1) >>
1031 					    inode->i_sb->s_blocksize_bits;
1032 
1033 				if (elen > numalloc) {
1034 					laarr[i].extLength -=
1035 						(numalloc <<
1036 						 inode->i_sb->s_blocksize_bits);
1037 					numalloc = 0;
1038 				} else {
1039 					numalloc -= elen;
1040 					if (*endnum > (i + 1))
1041 						memmove(&laarr[i],
1042 							&laarr[i + 1],
1043 							sizeof(struct long_ad) *
1044 							(*endnum - (i + 1)));
1045 					i--;
1046 					(*endnum)--;
1047 				}
1048 			}
1049 			UDF_I(inode)->i_lenExtents +=
1050 				numalloc << inode->i_sb->s_blocksize_bits;
1051 		}
1052 	}
1053 }
1054 
1055 static void udf_merge_extents(struct inode *inode,
1056 			      struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1057 			      int *endnum)
1058 {
1059 	int i;
1060 	unsigned long blocksize = inode->i_sb->s_blocksize;
1061 	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1062 
1063 	for (i = 0; i < (*endnum - 1); i++) {
1064 		struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1065 		struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1066 
1067 		if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1068 			(((li->extLength >> 30) ==
1069 				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1070 			((lip1->extLocation.logicalBlockNum -
1071 			  li->extLocation.logicalBlockNum) ==
1072 			(((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1073 			blocksize - 1) >> blocksize_bits)))) {
1074 
1075 			if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1076 				(lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1077 				blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1078 				lip1->extLength = (lip1->extLength -
1079 						  (li->extLength &
1080 						   UDF_EXTENT_LENGTH_MASK) +
1081 						   UDF_EXTENT_LENGTH_MASK) &
1082 							~(blocksize - 1);
1083 				li->extLength = (li->extLength &
1084 						 UDF_EXTENT_FLAG_MASK) +
1085 						(UDF_EXTENT_LENGTH_MASK + 1) -
1086 						blocksize;
1087 				lip1->extLocation.logicalBlockNum =
1088 					li->extLocation.logicalBlockNum +
1089 					((li->extLength &
1090 						UDF_EXTENT_LENGTH_MASK) >>
1091 						blocksize_bits);
1092 			} else {
1093 				li->extLength = lip1->extLength +
1094 					(((li->extLength &
1095 						UDF_EXTENT_LENGTH_MASK) +
1096 					 blocksize - 1) & ~(blocksize - 1));
1097 				if (*endnum > (i + 2))
1098 					memmove(&laarr[i + 1], &laarr[i + 2],
1099 						sizeof(struct long_ad) *
1100 						(*endnum - (i + 2)));
1101 				i--;
1102 				(*endnum)--;
1103 			}
1104 		} else if (((li->extLength >> 30) ==
1105 				(EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1106 			   ((lip1->extLength >> 30) ==
1107 				(EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1108 			udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1109 					((li->extLength &
1110 					  UDF_EXTENT_LENGTH_MASK) +
1111 					 blocksize - 1) >> blocksize_bits);
1112 			li->extLocation.logicalBlockNum = 0;
1113 			li->extLocation.partitionReferenceNum = 0;
1114 
1115 			if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1116 			     (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1117 			     blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1118 				lip1->extLength = (lip1->extLength -
1119 						   (li->extLength &
1120 						   UDF_EXTENT_LENGTH_MASK) +
1121 						   UDF_EXTENT_LENGTH_MASK) &
1122 						   ~(blocksize - 1);
1123 				li->extLength = (li->extLength &
1124 						 UDF_EXTENT_FLAG_MASK) +
1125 						(UDF_EXTENT_LENGTH_MASK + 1) -
1126 						blocksize;
1127 			} else {
1128 				li->extLength = lip1->extLength +
1129 					(((li->extLength &
1130 						UDF_EXTENT_LENGTH_MASK) +
1131 					  blocksize - 1) & ~(blocksize - 1));
1132 				if (*endnum > (i + 2))
1133 					memmove(&laarr[i + 1], &laarr[i + 2],
1134 						sizeof(struct long_ad) *
1135 						(*endnum - (i + 2)));
1136 				i--;
1137 				(*endnum)--;
1138 			}
1139 		} else if ((li->extLength >> 30) ==
1140 					(EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1141 			udf_free_blocks(inode->i_sb, inode,
1142 					&li->extLocation, 0,
1143 					((li->extLength &
1144 						UDF_EXTENT_LENGTH_MASK) +
1145 					 blocksize - 1) >> blocksize_bits);
1146 			li->extLocation.logicalBlockNum = 0;
1147 			li->extLocation.partitionReferenceNum = 0;
1148 			li->extLength = (li->extLength &
1149 						UDF_EXTENT_LENGTH_MASK) |
1150 						EXT_NOT_RECORDED_NOT_ALLOCATED;
1151 		}
1152 	}
1153 }
1154 
1155 static void udf_update_extents(struct inode *inode,
1156 			       struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1157 			       int startnum, int endnum,
1158 			       struct extent_position *epos)
1159 {
1160 	int start = 0, i;
1161 	struct kernel_lb_addr tmploc;
1162 	uint32_t tmplen;
1163 
1164 	if (startnum > endnum) {
1165 		for (i = 0; i < (startnum - endnum); i++)
1166 			udf_delete_aext(inode, *epos, laarr[i].extLocation,
1167 					laarr[i].extLength);
1168 	} else if (startnum < endnum) {
1169 		for (i = 0; i < (endnum - startnum); i++) {
1170 			udf_insert_aext(inode, *epos, laarr[i].extLocation,
1171 					laarr[i].extLength);
1172 			udf_next_aext(inode, epos, &laarr[i].extLocation,
1173 				      &laarr[i].extLength, 1);
1174 			start++;
1175 		}
1176 	}
1177 
1178 	for (i = start; i < endnum; i++) {
1179 		udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1180 		udf_write_aext(inode, epos, &laarr[i].extLocation,
1181 			       laarr[i].extLength, 1);
1182 	}
1183 }
1184 
1185 struct buffer_head *udf_bread(struct inode *inode, int block,
1186 			      int create, int *err)
1187 {
1188 	struct buffer_head *bh = NULL;
1189 
1190 	bh = udf_getblk(inode, block, create, err);
1191 	if (!bh)
1192 		return NULL;
1193 
1194 	if (buffer_uptodate(bh))
1195 		return bh;
1196 
1197 	ll_rw_block(READ, 1, &bh);
1198 
1199 	wait_on_buffer(bh);
1200 	if (buffer_uptodate(bh))
1201 		return bh;
1202 
1203 	brelse(bh);
1204 	*err = -EIO;
1205 	return NULL;
1206 }
1207 
1208 int udf_setsize(struct inode *inode, loff_t newsize)
1209 {
1210 	int err;
1211 	struct udf_inode_info *iinfo;
1212 	int bsize = 1 << inode->i_blkbits;
1213 
1214 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1215 	      S_ISLNK(inode->i_mode)))
1216 		return -EINVAL;
1217 	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1218 		return -EPERM;
1219 
1220 	iinfo = UDF_I(inode);
1221 	if (newsize > inode->i_size) {
1222 		down_write(&iinfo->i_data_sem);
1223 		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1224 			if (bsize <
1225 			    (udf_file_entry_alloc_offset(inode) + newsize)) {
1226 				err = udf_expand_file_adinicb(inode);
1227 				if (err)
1228 					return err;
1229 				down_write(&iinfo->i_data_sem);
1230 			} else {
1231 				iinfo->i_lenAlloc = newsize;
1232 				goto set_size;
1233 			}
1234 		}
1235 		err = udf_extend_file(inode, newsize);
1236 		if (err) {
1237 			up_write(&iinfo->i_data_sem);
1238 			return err;
1239 		}
1240 set_size:
1241 		truncate_setsize(inode, newsize);
1242 		up_write(&iinfo->i_data_sem);
1243 	} else {
1244 		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1245 			down_write(&iinfo->i_data_sem);
1246 			udf_clear_extent_cache(inode);
1247 			memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1248 			       0x00, bsize - newsize -
1249 			       udf_file_entry_alloc_offset(inode));
1250 			iinfo->i_lenAlloc = newsize;
1251 			truncate_setsize(inode, newsize);
1252 			up_write(&iinfo->i_data_sem);
1253 			goto update_time;
1254 		}
1255 		err = block_truncate_page(inode->i_mapping, newsize,
1256 					  udf_get_block);
1257 		if (err)
1258 			return err;
1259 		down_write(&iinfo->i_data_sem);
1260 		udf_clear_extent_cache(inode);
1261 		truncate_setsize(inode, newsize);
1262 		udf_truncate_extents(inode);
1263 		up_write(&iinfo->i_data_sem);
1264 	}
1265 update_time:
1266 	inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1267 	if (IS_SYNC(inode))
1268 		udf_sync_inode(inode);
1269 	else
1270 		mark_inode_dirty(inode);
1271 	return 0;
1272 }
1273 
1274 static void __udf_read_inode(struct inode *inode)
1275 {
1276 	struct buffer_head *bh = NULL;
1277 	struct fileEntry *fe;
1278 	uint16_t ident;
1279 	struct udf_inode_info *iinfo = UDF_I(inode);
1280 
1281 	/*
1282 	 * Set defaults, but the inode is still incomplete!
1283 	 * Note: get_new_inode() sets the following on a new inode:
1284 	 *      i_sb = sb
1285 	 *      i_no = ino
1286 	 *      i_flags = sb->s_flags
1287 	 *      i_state = 0
1288 	 * clean_inode(): zero fills and sets
1289 	 *      i_count = 1
1290 	 *      i_nlink = 1
1291 	 *      i_op = NULL;
1292 	 */
1293 	bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1294 	if (!bh) {
1295 		udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1296 		make_bad_inode(inode);
1297 		return;
1298 	}
1299 
1300 	if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1301 	    ident != TAG_IDENT_USE) {
1302 		udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1303 			inode->i_ino, ident);
1304 		brelse(bh);
1305 		make_bad_inode(inode);
1306 		return;
1307 	}
1308 
1309 	fe = (struct fileEntry *)bh->b_data;
1310 
1311 	if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1312 		struct buffer_head *ibh;
1313 
1314 		ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1315 					&ident);
1316 		if (ident == TAG_IDENT_IE && ibh) {
1317 			struct buffer_head *nbh = NULL;
1318 			struct kernel_lb_addr loc;
1319 			struct indirectEntry *ie;
1320 
1321 			ie = (struct indirectEntry *)ibh->b_data;
1322 			loc = lelb_to_cpu(ie->indirectICB.extLocation);
1323 
1324 			if (ie->indirectICB.extLength &&
1325 				(nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1326 							&ident))) {
1327 				if (ident == TAG_IDENT_FE ||
1328 					ident == TAG_IDENT_EFE) {
1329 					memcpy(&iinfo->i_location,
1330 						&loc,
1331 						sizeof(struct kernel_lb_addr));
1332 					brelse(bh);
1333 					brelse(ibh);
1334 					brelse(nbh);
1335 					__udf_read_inode(inode);
1336 					return;
1337 				}
1338 				brelse(nbh);
1339 			}
1340 		}
1341 		brelse(ibh);
1342 	} else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1343 		udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1344 			le16_to_cpu(fe->icbTag.strategyType));
1345 		brelse(bh);
1346 		make_bad_inode(inode);
1347 		return;
1348 	}
1349 	udf_fill_inode(inode, bh);
1350 
1351 	brelse(bh);
1352 }
1353 
1354 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1355 {
1356 	struct fileEntry *fe;
1357 	struct extendedFileEntry *efe;
1358 	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1359 	struct udf_inode_info *iinfo = UDF_I(inode);
1360 	unsigned int link_count;
1361 
1362 	fe = (struct fileEntry *)bh->b_data;
1363 	efe = (struct extendedFileEntry *)bh->b_data;
1364 
1365 	if (fe->icbTag.strategyType == cpu_to_le16(4))
1366 		iinfo->i_strat4096 = 0;
1367 	else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1368 		iinfo->i_strat4096 = 1;
1369 
1370 	iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1371 							ICBTAG_FLAG_AD_MASK;
1372 	iinfo->i_unique = 0;
1373 	iinfo->i_lenEAttr = 0;
1374 	iinfo->i_lenExtents = 0;
1375 	iinfo->i_lenAlloc = 0;
1376 	iinfo->i_next_alloc_block = 0;
1377 	iinfo->i_next_alloc_goal = 0;
1378 	if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1379 		iinfo->i_efe = 1;
1380 		iinfo->i_use = 0;
1381 		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1382 					sizeof(struct extendedFileEntry))) {
1383 			make_bad_inode(inode);
1384 			return;
1385 		}
1386 		memcpy(iinfo->i_ext.i_data,
1387 		       bh->b_data + sizeof(struct extendedFileEntry),
1388 		       inode->i_sb->s_blocksize -
1389 					sizeof(struct extendedFileEntry));
1390 	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1391 		iinfo->i_efe = 0;
1392 		iinfo->i_use = 0;
1393 		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1394 						sizeof(struct fileEntry))) {
1395 			make_bad_inode(inode);
1396 			return;
1397 		}
1398 		memcpy(iinfo->i_ext.i_data,
1399 		       bh->b_data + sizeof(struct fileEntry),
1400 		       inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1401 	} else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1402 		iinfo->i_efe = 0;
1403 		iinfo->i_use = 1;
1404 		iinfo->i_lenAlloc = le32_to_cpu(
1405 				((struct unallocSpaceEntry *)bh->b_data)->
1406 				 lengthAllocDescs);
1407 		if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1408 					sizeof(struct unallocSpaceEntry))) {
1409 			make_bad_inode(inode);
1410 			return;
1411 		}
1412 		memcpy(iinfo->i_ext.i_data,
1413 		       bh->b_data + sizeof(struct unallocSpaceEntry),
1414 		       inode->i_sb->s_blocksize -
1415 					sizeof(struct unallocSpaceEntry));
1416 		return;
1417 	}
1418 
1419 	read_lock(&sbi->s_cred_lock);
1420 	i_uid_write(inode, le32_to_cpu(fe->uid));
1421 	if (!uid_valid(inode->i_uid) ||
1422 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1423 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1424 		inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1425 
1426 	i_gid_write(inode, le32_to_cpu(fe->gid));
1427 	if (!gid_valid(inode->i_gid) ||
1428 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1429 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1430 		inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1431 
1432 	if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1433 			sbi->s_fmode != UDF_INVALID_MODE)
1434 		inode->i_mode = sbi->s_fmode;
1435 	else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1436 			sbi->s_dmode != UDF_INVALID_MODE)
1437 		inode->i_mode = sbi->s_dmode;
1438 	else
1439 		inode->i_mode = udf_convert_permissions(fe);
1440 	inode->i_mode &= ~sbi->s_umask;
1441 	read_unlock(&sbi->s_cred_lock);
1442 
1443 	link_count = le16_to_cpu(fe->fileLinkCount);
1444 	if (!link_count)
1445 		link_count = 1;
1446 	set_nlink(inode, link_count);
1447 
1448 	inode->i_size = le64_to_cpu(fe->informationLength);
1449 	iinfo->i_lenExtents = inode->i_size;
1450 
1451 	if (iinfo->i_efe == 0) {
1452 		inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1453 			(inode->i_sb->s_blocksize_bits - 9);
1454 
1455 		if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1456 			inode->i_atime = sbi->s_record_time;
1457 
1458 		if (!udf_disk_stamp_to_time(&inode->i_mtime,
1459 					    fe->modificationTime))
1460 			inode->i_mtime = sbi->s_record_time;
1461 
1462 		if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1463 			inode->i_ctime = sbi->s_record_time;
1464 
1465 		iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1466 		iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1467 		iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1468 		iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1469 	} else {
1470 		inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1471 		    (inode->i_sb->s_blocksize_bits - 9);
1472 
1473 		if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1474 			inode->i_atime = sbi->s_record_time;
1475 
1476 		if (!udf_disk_stamp_to_time(&inode->i_mtime,
1477 					    efe->modificationTime))
1478 			inode->i_mtime = sbi->s_record_time;
1479 
1480 		if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1481 			iinfo->i_crtime = sbi->s_record_time;
1482 
1483 		if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1484 			inode->i_ctime = sbi->s_record_time;
1485 
1486 		iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1487 		iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1488 		iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1489 		iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1490 	}
1491 
1492 	switch (fe->icbTag.fileType) {
1493 	case ICBTAG_FILE_TYPE_DIRECTORY:
1494 		inode->i_op = &udf_dir_inode_operations;
1495 		inode->i_fop = &udf_dir_operations;
1496 		inode->i_mode |= S_IFDIR;
1497 		inc_nlink(inode);
1498 		break;
1499 	case ICBTAG_FILE_TYPE_REALTIME:
1500 	case ICBTAG_FILE_TYPE_REGULAR:
1501 	case ICBTAG_FILE_TYPE_UNDEF:
1502 	case ICBTAG_FILE_TYPE_VAT20:
1503 		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1504 			inode->i_data.a_ops = &udf_adinicb_aops;
1505 		else
1506 			inode->i_data.a_ops = &udf_aops;
1507 		inode->i_op = &udf_file_inode_operations;
1508 		inode->i_fop = &udf_file_operations;
1509 		inode->i_mode |= S_IFREG;
1510 		break;
1511 	case ICBTAG_FILE_TYPE_BLOCK:
1512 		inode->i_mode |= S_IFBLK;
1513 		break;
1514 	case ICBTAG_FILE_TYPE_CHAR:
1515 		inode->i_mode |= S_IFCHR;
1516 		break;
1517 	case ICBTAG_FILE_TYPE_FIFO:
1518 		init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1519 		break;
1520 	case ICBTAG_FILE_TYPE_SOCKET:
1521 		init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1522 		break;
1523 	case ICBTAG_FILE_TYPE_SYMLINK:
1524 		inode->i_data.a_ops = &udf_symlink_aops;
1525 		inode->i_op = &udf_symlink_inode_operations;
1526 		inode->i_mode = S_IFLNK | S_IRWXUGO;
1527 		break;
1528 	case ICBTAG_FILE_TYPE_MAIN:
1529 		udf_debug("METADATA FILE-----\n");
1530 		break;
1531 	case ICBTAG_FILE_TYPE_MIRROR:
1532 		udf_debug("METADATA MIRROR FILE-----\n");
1533 		break;
1534 	case ICBTAG_FILE_TYPE_BITMAP:
1535 		udf_debug("METADATA BITMAP FILE-----\n");
1536 		break;
1537 	default:
1538 		udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1539 			inode->i_ino, fe->icbTag.fileType);
1540 		make_bad_inode(inode);
1541 		return;
1542 	}
1543 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1544 		struct deviceSpec *dsea =
1545 			(struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1546 		if (dsea) {
1547 			init_special_inode(inode, inode->i_mode,
1548 				MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1549 				      le32_to_cpu(dsea->minorDeviceIdent)));
1550 			/* Developer ID ??? */
1551 		} else
1552 			make_bad_inode(inode);
1553 	}
1554 }
1555 
1556 static int udf_alloc_i_data(struct inode *inode, size_t size)
1557 {
1558 	struct udf_inode_info *iinfo = UDF_I(inode);
1559 	iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1560 
1561 	if (!iinfo->i_ext.i_data) {
1562 		udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1563 			inode->i_ino);
1564 		return -ENOMEM;
1565 	}
1566 
1567 	return 0;
1568 }
1569 
1570 static umode_t udf_convert_permissions(struct fileEntry *fe)
1571 {
1572 	umode_t mode;
1573 	uint32_t permissions;
1574 	uint32_t flags;
1575 
1576 	permissions = le32_to_cpu(fe->permissions);
1577 	flags = le16_to_cpu(fe->icbTag.flags);
1578 
1579 	mode =	((permissions) & S_IRWXO) |
1580 		((permissions >> 2) & S_IRWXG) |
1581 		((permissions >> 4) & S_IRWXU) |
1582 		((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1583 		((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1584 		((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1585 
1586 	return mode;
1587 }
1588 
1589 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1590 {
1591 	return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1592 }
1593 
1594 static int udf_sync_inode(struct inode *inode)
1595 {
1596 	return udf_update_inode(inode, 1);
1597 }
1598 
1599 static int udf_update_inode(struct inode *inode, int do_sync)
1600 {
1601 	struct buffer_head *bh = NULL;
1602 	struct fileEntry *fe;
1603 	struct extendedFileEntry *efe;
1604 	uint64_t lb_recorded;
1605 	uint32_t udfperms;
1606 	uint16_t icbflags;
1607 	uint16_t crclen;
1608 	int err = 0;
1609 	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1610 	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1611 	struct udf_inode_info *iinfo = UDF_I(inode);
1612 
1613 	bh = udf_tgetblk(inode->i_sb,
1614 			udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1615 	if (!bh) {
1616 		udf_debug("getblk failure\n");
1617 		return -ENOMEM;
1618 	}
1619 
1620 	lock_buffer(bh);
1621 	memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1622 	fe = (struct fileEntry *)bh->b_data;
1623 	efe = (struct extendedFileEntry *)bh->b_data;
1624 
1625 	if (iinfo->i_use) {
1626 		struct unallocSpaceEntry *use =
1627 			(struct unallocSpaceEntry *)bh->b_data;
1628 
1629 		use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1630 		memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1631 		       iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1632 					sizeof(struct unallocSpaceEntry));
1633 		use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1634 		use->descTag.tagLocation =
1635 				cpu_to_le32(iinfo->i_location.logicalBlockNum);
1636 		crclen = sizeof(struct unallocSpaceEntry) +
1637 				iinfo->i_lenAlloc - sizeof(struct tag);
1638 		use->descTag.descCRCLength = cpu_to_le16(crclen);
1639 		use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1640 							   sizeof(struct tag),
1641 							   crclen));
1642 		use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1643 
1644 		goto out;
1645 	}
1646 
1647 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1648 		fe->uid = cpu_to_le32(-1);
1649 	else
1650 		fe->uid = cpu_to_le32(i_uid_read(inode));
1651 
1652 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1653 		fe->gid = cpu_to_le32(-1);
1654 	else
1655 		fe->gid = cpu_to_le32(i_gid_read(inode));
1656 
1657 	udfperms = ((inode->i_mode & S_IRWXO)) |
1658 		   ((inode->i_mode & S_IRWXG) << 2) |
1659 		   ((inode->i_mode & S_IRWXU) << 4);
1660 
1661 	udfperms |= (le32_to_cpu(fe->permissions) &
1662 		    (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1663 		     FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1664 		     FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1665 	fe->permissions = cpu_to_le32(udfperms);
1666 
1667 	if (S_ISDIR(inode->i_mode))
1668 		fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1669 	else
1670 		fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1671 
1672 	fe->informationLength = cpu_to_le64(inode->i_size);
1673 
1674 	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1675 		struct regid *eid;
1676 		struct deviceSpec *dsea =
1677 			(struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1678 		if (!dsea) {
1679 			dsea = (struct deviceSpec *)
1680 				udf_add_extendedattr(inode,
1681 						     sizeof(struct deviceSpec) +
1682 						     sizeof(struct regid), 12, 0x3);
1683 			dsea->attrType = cpu_to_le32(12);
1684 			dsea->attrSubtype = 1;
1685 			dsea->attrLength = cpu_to_le32(
1686 						sizeof(struct deviceSpec) +
1687 						sizeof(struct regid));
1688 			dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1689 		}
1690 		eid = (struct regid *)dsea->impUse;
1691 		memset(eid, 0, sizeof(struct regid));
1692 		strcpy(eid->ident, UDF_ID_DEVELOPER);
1693 		eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1694 		eid->identSuffix[1] = UDF_OS_ID_LINUX;
1695 		dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1696 		dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1697 	}
1698 
1699 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1700 		lb_recorded = 0; /* No extents => no blocks! */
1701 	else
1702 		lb_recorded =
1703 			(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1704 			(blocksize_bits - 9);
1705 
1706 	if (iinfo->i_efe == 0) {
1707 		memcpy(bh->b_data + sizeof(struct fileEntry),
1708 		       iinfo->i_ext.i_data,
1709 		       inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1710 		fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1711 
1712 		udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1713 		udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1714 		udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1715 		memset(&(fe->impIdent), 0, sizeof(struct regid));
1716 		strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1717 		fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1718 		fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1719 		fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1720 		fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1721 		fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1722 		fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1723 		fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1724 		crclen = sizeof(struct fileEntry);
1725 	} else {
1726 		memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1727 		       iinfo->i_ext.i_data,
1728 		       inode->i_sb->s_blocksize -
1729 					sizeof(struct extendedFileEntry));
1730 		efe->objectSize = cpu_to_le64(inode->i_size);
1731 		efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1732 
1733 		if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1734 		    (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1735 		     iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1736 			iinfo->i_crtime = inode->i_atime;
1737 
1738 		if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1739 		    (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1740 		     iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1741 			iinfo->i_crtime = inode->i_mtime;
1742 
1743 		if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1744 		    (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1745 		     iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1746 			iinfo->i_crtime = inode->i_ctime;
1747 
1748 		udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1749 		udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1750 		udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1751 		udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1752 
1753 		memset(&(efe->impIdent), 0, sizeof(struct regid));
1754 		strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1755 		efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1756 		efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1757 		efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1758 		efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1759 		efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1760 		efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1761 		efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1762 		crclen = sizeof(struct extendedFileEntry);
1763 	}
1764 	if (iinfo->i_strat4096) {
1765 		fe->icbTag.strategyType = cpu_to_le16(4096);
1766 		fe->icbTag.strategyParameter = cpu_to_le16(1);
1767 		fe->icbTag.numEntries = cpu_to_le16(2);
1768 	} else {
1769 		fe->icbTag.strategyType = cpu_to_le16(4);
1770 		fe->icbTag.numEntries = cpu_to_le16(1);
1771 	}
1772 
1773 	if (S_ISDIR(inode->i_mode))
1774 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1775 	else if (S_ISREG(inode->i_mode))
1776 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1777 	else if (S_ISLNK(inode->i_mode))
1778 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1779 	else if (S_ISBLK(inode->i_mode))
1780 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1781 	else if (S_ISCHR(inode->i_mode))
1782 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1783 	else if (S_ISFIFO(inode->i_mode))
1784 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1785 	else if (S_ISSOCK(inode->i_mode))
1786 		fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1787 
1788 	icbflags =	iinfo->i_alloc_type |
1789 			((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1790 			((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1791 			((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1792 			(le16_to_cpu(fe->icbTag.flags) &
1793 				~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1794 				ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1795 
1796 	fe->icbTag.flags = cpu_to_le16(icbflags);
1797 	if (sbi->s_udfrev >= 0x0200)
1798 		fe->descTag.descVersion = cpu_to_le16(3);
1799 	else
1800 		fe->descTag.descVersion = cpu_to_le16(2);
1801 	fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1802 	fe->descTag.tagLocation = cpu_to_le32(
1803 					iinfo->i_location.logicalBlockNum);
1804 	crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1805 	fe->descTag.descCRCLength = cpu_to_le16(crclen);
1806 	fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1807 						  crclen));
1808 	fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1809 
1810 out:
1811 	set_buffer_uptodate(bh);
1812 	unlock_buffer(bh);
1813 
1814 	/* write the data blocks */
1815 	mark_buffer_dirty(bh);
1816 	if (do_sync) {
1817 		sync_dirty_buffer(bh);
1818 		if (buffer_write_io_error(bh)) {
1819 			udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1820 				 inode->i_ino);
1821 			err = -EIO;
1822 		}
1823 	}
1824 	brelse(bh);
1825 
1826 	return err;
1827 }
1828 
1829 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1830 {
1831 	unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1832 	struct inode *inode = iget_locked(sb, block);
1833 
1834 	if (!inode)
1835 		return NULL;
1836 
1837 	if (inode->i_state & I_NEW) {
1838 		memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1839 		__udf_read_inode(inode);
1840 		unlock_new_inode(inode);
1841 	}
1842 
1843 	if (is_bad_inode(inode))
1844 		goto out_iput;
1845 
1846 	if (ino->logicalBlockNum >= UDF_SB(sb)->
1847 			s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1848 		udf_debug("block=%d, partition=%d out of range\n",
1849 			  ino->logicalBlockNum, ino->partitionReferenceNum);
1850 		make_bad_inode(inode);
1851 		goto out_iput;
1852 	}
1853 
1854 	return inode;
1855 
1856  out_iput:
1857 	iput(inode);
1858 	return NULL;
1859 }
1860 
1861 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1862 		 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1863 {
1864 	int adsize;
1865 	struct short_ad *sad = NULL;
1866 	struct long_ad *lad = NULL;
1867 	struct allocExtDesc *aed;
1868 	uint8_t *ptr;
1869 	struct udf_inode_info *iinfo = UDF_I(inode);
1870 
1871 	if (!epos->bh)
1872 		ptr = iinfo->i_ext.i_data + epos->offset -
1873 			udf_file_entry_alloc_offset(inode) +
1874 			iinfo->i_lenEAttr;
1875 	else
1876 		ptr = epos->bh->b_data + epos->offset;
1877 
1878 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1879 		adsize = sizeof(struct short_ad);
1880 	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1881 		adsize = sizeof(struct long_ad);
1882 	else
1883 		return -EIO;
1884 
1885 	if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1886 		unsigned char *sptr, *dptr;
1887 		struct buffer_head *nbh;
1888 		int err, loffset;
1889 		struct kernel_lb_addr obloc = epos->block;
1890 
1891 		epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1892 						obloc.partitionReferenceNum,
1893 						obloc.logicalBlockNum, &err);
1894 		if (!epos->block.logicalBlockNum)
1895 			return -ENOSPC;
1896 		nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1897 								 &epos->block,
1898 								 0));
1899 		if (!nbh)
1900 			return -EIO;
1901 		lock_buffer(nbh);
1902 		memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1903 		set_buffer_uptodate(nbh);
1904 		unlock_buffer(nbh);
1905 		mark_buffer_dirty_inode(nbh, inode);
1906 
1907 		aed = (struct allocExtDesc *)(nbh->b_data);
1908 		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1909 			aed->previousAllocExtLocation =
1910 					cpu_to_le32(obloc.logicalBlockNum);
1911 		if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1912 			loffset = epos->offset;
1913 			aed->lengthAllocDescs = cpu_to_le32(adsize);
1914 			sptr = ptr - adsize;
1915 			dptr = nbh->b_data + sizeof(struct allocExtDesc);
1916 			memcpy(dptr, sptr, adsize);
1917 			epos->offset = sizeof(struct allocExtDesc) + adsize;
1918 		} else {
1919 			loffset = epos->offset + adsize;
1920 			aed->lengthAllocDescs = cpu_to_le32(0);
1921 			sptr = ptr;
1922 			epos->offset = sizeof(struct allocExtDesc);
1923 
1924 			if (epos->bh) {
1925 				aed = (struct allocExtDesc *)epos->bh->b_data;
1926 				le32_add_cpu(&aed->lengthAllocDescs, adsize);
1927 			} else {
1928 				iinfo->i_lenAlloc += adsize;
1929 				mark_inode_dirty(inode);
1930 			}
1931 		}
1932 		if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1933 			udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1934 				    epos->block.logicalBlockNum, sizeof(struct tag));
1935 		else
1936 			udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1937 				    epos->block.logicalBlockNum, sizeof(struct tag));
1938 		switch (iinfo->i_alloc_type) {
1939 		case ICBTAG_FLAG_AD_SHORT:
1940 			sad = (struct short_ad *)sptr;
1941 			sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1942 						     inode->i_sb->s_blocksize);
1943 			sad->extPosition =
1944 				cpu_to_le32(epos->block.logicalBlockNum);
1945 			break;
1946 		case ICBTAG_FLAG_AD_LONG:
1947 			lad = (struct long_ad *)sptr;
1948 			lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1949 						     inode->i_sb->s_blocksize);
1950 			lad->extLocation = cpu_to_lelb(epos->block);
1951 			memset(lad->impUse, 0x00, sizeof(lad->impUse));
1952 			break;
1953 		}
1954 		if (epos->bh) {
1955 			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1956 			    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1957 				udf_update_tag(epos->bh->b_data, loffset);
1958 			else
1959 				udf_update_tag(epos->bh->b_data,
1960 						sizeof(struct allocExtDesc));
1961 			mark_buffer_dirty_inode(epos->bh, inode);
1962 			brelse(epos->bh);
1963 		} else {
1964 			mark_inode_dirty(inode);
1965 		}
1966 		epos->bh = nbh;
1967 	}
1968 
1969 	udf_write_aext(inode, epos, eloc, elen, inc);
1970 
1971 	if (!epos->bh) {
1972 		iinfo->i_lenAlloc += adsize;
1973 		mark_inode_dirty(inode);
1974 	} else {
1975 		aed = (struct allocExtDesc *)epos->bh->b_data;
1976 		le32_add_cpu(&aed->lengthAllocDescs, adsize);
1977 		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1978 				UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1979 			udf_update_tag(epos->bh->b_data,
1980 					epos->offset + (inc ? 0 : adsize));
1981 		else
1982 			udf_update_tag(epos->bh->b_data,
1983 					sizeof(struct allocExtDesc));
1984 		mark_buffer_dirty_inode(epos->bh, inode);
1985 	}
1986 
1987 	return 0;
1988 }
1989 
1990 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1991 		    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1992 {
1993 	int adsize;
1994 	uint8_t *ptr;
1995 	struct short_ad *sad;
1996 	struct long_ad *lad;
1997 	struct udf_inode_info *iinfo = UDF_I(inode);
1998 
1999 	if (!epos->bh)
2000 		ptr = iinfo->i_ext.i_data + epos->offset -
2001 			udf_file_entry_alloc_offset(inode) +
2002 			iinfo->i_lenEAttr;
2003 	else
2004 		ptr = epos->bh->b_data + epos->offset;
2005 
2006 	switch (iinfo->i_alloc_type) {
2007 	case ICBTAG_FLAG_AD_SHORT:
2008 		sad = (struct short_ad *)ptr;
2009 		sad->extLength = cpu_to_le32(elen);
2010 		sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2011 		adsize = sizeof(struct short_ad);
2012 		break;
2013 	case ICBTAG_FLAG_AD_LONG:
2014 		lad = (struct long_ad *)ptr;
2015 		lad->extLength = cpu_to_le32(elen);
2016 		lad->extLocation = cpu_to_lelb(*eloc);
2017 		memset(lad->impUse, 0x00, sizeof(lad->impUse));
2018 		adsize = sizeof(struct long_ad);
2019 		break;
2020 	default:
2021 		return;
2022 	}
2023 
2024 	if (epos->bh) {
2025 		if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2026 		    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2027 			struct allocExtDesc *aed =
2028 				(struct allocExtDesc *)epos->bh->b_data;
2029 			udf_update_tag(epos->bh->b_data,
2030 				       le32_to_cpu(aed->lengthAllocDescs) +
2031 				       sizeof(struct allocExtDesc));
2032 		}
2033 		mark_buffer_dirty_inode(epos->bh, inode);
2034 	} else {
2035 		mark_inode_dirty(inode);
2036 	}
2037 
2038 	if (inc)
2039 		epos->offset += adsize;
2040 }
2041 
2042 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2043 		     struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2044 {
2045 	int8_t etype;
2046 
2047 	while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2048 	       (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2049 		int block;
2050 		epos->block = *eloc;
2051 		epos->offset = sizeof(struct allocExtDesc);
2052 		brelse(epos->bh);
2053 		block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2054 		epos->bh = udf_tread(inode->i_sb, block);
2055 		if (!epos->bh) {
2056 			udf_debug("reading block %d failed!\n", block);
2057 			return -1;
2058 		}
2059 	}
2060 
2061 	return etype;
2062 }
2063 
2064 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2065 			struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2066 {
2067 	int alen;
2068 	int8_t etype;
2069 	uint8_t *ptr;
2070 	struct short_ad *sad;
2071 	struct long_ad *lad;
2072 	struct udf_inode_info *iinfo = UDF_I(inode);
2073 
2074 	if (!epos->bh) {
2075 		if (!epos->offset)
2076 			epos->offset = udf_file_entry_alloc_offset(inode);
2077 		ptr = iinfo->i_ext.i_data + epos->offset -
2078 			udf_file_entry_alloc_offset(inode) +
2079 			iinfo->i_lenEAttr;
2080 		alen = udf_file_entry_alloc_offset(inode) +
2081 							iinfo->i_lenAlloc;
2082 	} else {
2083 		if (!epos->offset)
2084 			epos->offset = sizeof(struct allocExtDesc);
2085 		ptr = epos->bh->b_data + epos->offset;
2086 		alen = sizeof(struct allocExtDesc) +
2087 			le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2088 							lengthAllocDescs);
2089 	}
2090 
2091 	switch (iinfo->i_alloc_type) {
2092 	case ICBTAG_FLAG_AD_SHORT:
2093 		sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2094 		if (!sad)
2095 			return -1;
2096 		etype = le32_to_cpu(sad->extLength) >> 30;
2097 		eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2098 		eloc->partitionReferenceNum =
2099 				iinfo->i_location.partitionReferenceNum;
2100 		*elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2101 		break;
2102 	case ICBTAG_FLAG_AD_LONG:
2103 		lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2104 		if (!lad)
2105 			return -1;
2106 		etype = le32_to_cpu(lad->extLength) >> 30;
2107 		*eloc = lelb_to_cpu(lad->extLocation);
2108 		*elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2109 		break;
2110 	default:
2111 		udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2112 		return -1;
2113 	}
2114 
2115 	return etype;
2116 }
2117 
2118 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2119 			      struct kernel_lb_addr neloc, uint32_t nelen)
2120 {
2121 	struct kernel_lb_addr oeloc;
2122 	uint32_t oelen;
2123 	int8_t etype;
2124 
2125 	if (epos.bh)
2126 		get_bh(epos.bh);
2127 
2128 	while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2129 		udf_write_aext(inode, &epos, &neloc, nelen, 1);
2130 		neloc = oeloc;
2131 		nelen = (etype << 30) | oelen;
2132 	}
2133 	udf_add_aext(inode, &epos, &neloc, nelen, 1);
2134 	brelse(epos.bh);
2135 
2136 	return (nelen >> 30);
2137 }
2138 
2139 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2140 		       struct kernel_lb_addr eloc, uint32_t elen)
2141 {
2142 	struct extent_position oepos;
2143 	int adsize;
2144 	int8_t etype;
2145 	struct allocExtDesc *aed;
2146 	struct udf_inode_info *iinfo;
2147 
2148 	if (epos.bh) {
2149 		get_bh(epos.bh);
2150 		get_bh(epos.bh);
2151 	}
2152 
2153 	iinfo = UDF_I(inode);
2154 	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2155 		adsize = sizeof(struct short_ad);
2156 	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2157 		adsize = sizeof(struct long_ad);
2158 	else
2159 		adsize = 0;
2160 
2161 	oepos = epos;
2162 	if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2163 		return -1;
2164 
2165 	while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2166 		udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2167 		if (oepos.bh != epos.bh) {
2168 			oepos.block = epos.block;
2169 			brelse(oepos.bh);
2170 			get_bh(epos.bh);
2171 			oepos.bh = epos.bh;
2172 			oepos.offset = epos.offset - adsize;
2173 		}
2174 	}
2175 	memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2176 	elen = 0;
2177 
2178 	if (epos.bh != oepos.bh) {
2179 		udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2180 		udf_write_aext(inode, &oepos, &eloc, elen, 1);
2181 		udf_write_aext(inode, &oepos, &eloc, elen, 1);
2182 		if (!oepos.bh) {
2183 			iinfo->i_lenAlloc -= (adsize * 2);
2184 			mark_inode_dirty(inode);
2185 		} else {
2186 			aed = (struct allocExtDesc *)oepos.bh->b_data;
2187 			le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2188 			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2189 			    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2190 				udf_update_tag(oepos.bh->b_data,
2191 						oepos.offset - (2 * adsize));
2192 			else
2193 				udf_update_tag(oepos.bh->b_data,
2194 						sizeof(struct allocExtDesc));
2195 			mark_buffer_dirty_inode(oepos.bh, inode);
2196 		}
2197 	} else {
2198 		udf_write_aext(inode, &oepos, &eloc, elen, 1);
2199 		if (!oepos.bh) {
2200 			iinfo->i_lenAlloc -= adsize;
2201 			mark_inode_dirty(inode);
2202 		} else {
2203 			aed = (struct allocExtDesc *)oepos.bh->b_data;
2204 			le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2205 			if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2206 			    UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2207 				udf_update_tag(oepos.bh->b_data,
2208 						epos.offset - adsize);
2209 			else
2210 				udf_update_tag(oepos.bh->b_data,
2211 						sizeof(struct allocExtDesc));
2212 			mark_buffer_dirty_inode(oepos.bh, inode);
2213 		}
2214 	}
2215 
2216 	brelse(epos.bh);
2217 	brelse(oepos.bh);
2218 
2219 	return (elen >> 30);
2220 }
2221 
2222 int8_t inode_bmap(struct inode *inode, sector_t block,
2223 		  struct extent_position *pos, struct kernel_lb_addr *eloc,
2224 		  uint32_t *elen, sector_t *offset)
2225 {
2226 	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2227 	loff_t lbcount = 0, bcount =
2228 	    (loff_t) block << blocksize_bits;
2229 	int8_t etype;
2230 	struct udf_inode_info *iinfo;
2231 
2232 	iinfo = UDF_I(inode);
2233 	if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2234 		pos->offset = 0;
2235 		pos->block = iinfo->i_location;
2236 		pos->bh = NULL;
2237 	}
2238 	*elen = 0;
2239 	do {
2240 		etype = udf_next_aext(inode, pos, eloc, elen, 1);
2241 		if (etype == -1) {
2242 			*offset = (bcount - lbcount) >> blocksize_bits;
2243 			iinfo->i_lenExtents = lbcount;
2244 			return -1;
2245 		}
2246 		lbcount += *elen;
2247 	} while (lbcount <= bcount);
2248 	/* update extent cache */
2249 	udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2250 	*offset = (bcount + *elen - lbcount) >> blocksize_bits;
2251 
2252 	return etype;
2253 }
2254 
2255 long udf_block_map(struct inode *inode, sector_t block)
2256 {
2257 	struct kernel_lb_addr eloc;
2258 	uint32_t elen;
2259 	sector_t offset;
2260 	struct extent_position epos = {};
2261 	int ret;
2262 
2263 	down_read(&UDF_I(inode)->i_data_sem);
2264 
2265 	if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2266 						(EXT_RECORDED_ALLOCATED >> 30))
2267 		ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2268 	else
2269 		ret = 0;
2270 
2271 	up_read(&UDF_I(inode)->i_data_sem);
2272 	brelse(epos.bh);
2273 
2274 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2275 		return udf_fixed_to_variable(ret);
2276 	else
2277 		return ret;
2278 }
2279