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TOMOYO Linux Cross Reference
Linux/fs/udf/inode.c

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  1 /*
  2  * inode.c
  3  *
  4  * PURPOSE
  5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
  6  *
  7  * COPYRIGHT
  8  *  This file is distributed under the terms of the GNU General Public
  9  *  License (GPL). Copies of the GPL can be obtained from:
 10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
 11  *  Each contributing author retains all rights to their own work.
 12  *
 13  *  (C) 1998 Dave Boynton
 14  *  (C) 1998-2004 Ben Fennema
 15  *  (C) 1999-2000 Stelias Computing Inc
 16  *
 17  * HISTORY
 18  *
 19  *  10/04/98 dgb  Added rudimentary directory functions
 20  *  10/07/98      Fully working udf_block_map! It works!
 21  *  11/25/98      bmap altered to better support extents
 22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
 23  *                and udf_read_inode
 24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
 25  *                block boundaries (which is not actually allowed)
 26  *  12/20/98      added support for strategy 4096
 27  *  03/07/99      rewrote udf_block_map (again)
 28  *                New funcs, inode_bmap, udf_next_aext
 29  *  04/19/99      Support for writing device EA's for major/minor #
 30  */
 31 
 32 #include "udfdecl.h"
 33 #include <linux/mm.h>
 34 #include <linux/module.h>
 35 #include <linux/pagemap.h>
 36 #include <linux/buffer_head.h>
 37 #include <linux/writeback.h>
 38 #include <linux/slab.h>
 39 #include <linux/crc-itu-t.h>
 40 #include <linux/mpage.h>
 41 
 42 #include "udf_i.h"
 43 #include "udf_sb.h"
 44 
 45 MODULE_AUTHOR("Ben Fennema");
 46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
 47 MODULE_LICENSE("GPL");
 48 
 49 #define EXTENT_MERGE_SIZE 5
 50 
 51 static umode_t udf_convert_permissions(struct fileEntry *);
 52 static int udf_update_inode(struct inode *, int);
 53 static void udf_fill_inode(struct inode *, struct buffer_head *);
 54 static int udf_sync_inode(struct inode *inode);
 55 static int udf_alloc_i_data(struct inode *inode, size_t size);
 56 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
 57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
 58                               struct kernel_lb_addr, uint32_t);
 59 static void udf_split_extents(struct inode *, int *, int, int,
 60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
 61 static void udf_prealloc_extents(struct inode *, int, int,
 62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
 63 static void udf_merge_extents(struct inode *,
 64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
 65 static void udf_update_extents(struct inode *,
 66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
 67                                struct extent_position *);
 68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
 69 
 70 
 71 void udf_evict_inode(struct inode *inode)
 72 {
 73         struct udf_inode_info *iinfo = UDF_I(inode);
 74         int want_delete = 0;
 75 
 76         if (!inode->i_nlink && !is_bad_inode(inode)) {
 77                 want_delete = 1;
 78                 udf_setsize(inode, 0);
 79                 udf_update_inode(inode, IS_SYNC(inode));
 80         } else
 81                 truncate_inode_pages(&inode->i_data, 0);
 82         invalidate_inode_buffers(inode);
 83         end_writeback(inode);
 84         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 85             inode->i_size != iinfo->i_lenExtents) {
 86                 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",
 87                          inode->i_ino, inode->i_mode,
 88                          (unsigned long long)inode->i_size,
 89                          (unsigned long long)iinfo->i_lenExtents);
 90         }
 91         kfree(iinfo->i_ext.i_data);
 92         iinfo->i_ext.i_data = NULL;
 93         if (want_delete) {
 94                 udf_free_inode(inode);
 95         }
 96 }
 97 
 98 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 99 {
100         return block_write_full_page(page, udf_get_block, wbc);
101 }
102 
103 static int udf_readpage(struct file *file, struct page *page)
104 {
105         return mpage_readpage(page, udf_get_block);
106 }
107 
108 static int udf_readpages(struct file *file, struct address_space *mapping,
109                         struct list_head *pages, unsigned nr_pages)
110 {
111         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
112 }
113 
114 static int udf_write_begin(struct file *file, struct address_space *mapping,
115                         loff_t pos, unsigned len, unsigned flags,
116                         struct page **pagep, void **fsdata)
117 {
118         int ret;
119 
120         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
121         if (unlikely(ret)) {
122                 struct inode *inode = mapping->host;
123                 struct udf_inode_info *iinfo = UDF_I(inode);
124                 loff_t isize = inode->i_size;
125 
126                 if (pos + len > isize) {
127                         truncate_pagecache(inode, pos + len, isize);
128                         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
129                                 down_write(&iinfo->i_data_sem);
130                                 udf_truncate_extents(inode);
131                                 up_write(&iinfo->i_data_sem);
132                         }
133                 }
134         }
135 
136         return ret;
137 }
138 
139 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
140 {
141         return generic_block_bmap(mapping, block, udf_get_block);
142 }
143 
144 const struct address_space_operations udf_aops = {
145         .readpage       = udf_readpage,
146         .readpages      = udf_readpages,
147         .writepage      = udf_writepage,
148         .write_begin            = udf_write_begin,
149         .write_end              = generic_write_end,
150         .bmap           = udf_bmap,
151 };
152 
153 /*
154  * Expand file stored in ICB to a normal one-block-file
155  *
156  * This function requires i_data_sem for writing and releases it.
157  * This function requires i_mutex held
158  */
159 int udf_expand_file_adinicb(struct inode *inode)
160 {
161         struct page *page;
162         char *kaddr;
163         struct udf_inode_info *iinfo = UDF_I(inode);
164         int err;
165         struct writeback_control udf_wbc = {
166                 .sync_mode = WB_SYNC_NONE,
167                 .nr_to_write = 1,
168         };
169 
170         if (!iinfo->i_lenAlloc) {
171                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
172                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
173                 else
174                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
175                 /* from now on we have normal address_space methods */
176                 inode->i_data.a_ops = &udf_aops;
177                 up_write(&iinfo->i_data_sem);
178                 mark_inode_dirty(inode);
179                 return 0;
180         }
181         /*
182          * Release i_data_sem so that we can lock a page - page lock ranks
183          * above i_data_sem. i_mutex still protects us against file changes.
184          */
185         up_write(&iinfo->i_data_sem);
186 
187         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
188         if (!page)
189                 return -ENOMEM;
190 
191         if (!PageUptodate(page)) {
192                 kaddr = kmap(page);
193                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
194                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
195                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
196                         iinfo->i_lenAlloc);
197                 flush_dcache_page(page);
198                 SetPageUptodate(page);
199                 kunmap(page);
200         }
201         down_write(&iinfo->i_data_sem);
202         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
203                iinfo->i_lenAlloc);
204         iinfo->i_lenAlloc = 0;
205         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
206                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
207         else
208                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
209         /* from now on we have normal address_space methods */
210         inode->i_data.a_ops = &udf_aops;
211         up_write(&iinfo->i_data_sem);
212         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
213         if (err) {
214                 /* Restore everything back so that we don't lose data... */
215                 lock_page(page);
216                 kaddr = kmap(page);
217                 down_write(&iinfo->i_data_sem);
218                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
219                        inode->i_size);
220                 kunmap(page);
221                 unlock_page(page);
222                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
223                 inode->i_data.a_ops = &udf_adinicb_aops;
224                 up_write(&iinfo->i_data_sem);
225         }
226         page_cache_release(page);
227         mark_inode_dirty(inode);
228 
229         return err;
230 }
231 
232 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
233                                            int *err)
234 {
235         int newblock;
236         struct buffer_head *dbh = NULL;
237         struct kernel_lb_addr eloc;
238         uint8_t alloctype;
239         struct extent_position epos;
240 
241         struct udf_fileident_bh sfibh, dfibh;
242         loff_t f_pos = udf_ext0_offset(inode);
243         int size = udf_ext0_offset(inode) + inode->i_size;
244         struct fileIdentDesc cfi, *sfi, *dfi;
245         struct udf_inode_info *iinfo = UDF_I(inode);
246 
247         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
248                 alloctype = ICBTAG_FLAG_AD_SHORT;
249         else
250                 alloctype = ICBTAG_FLAG_AD_LONG;
251 
252         if (!inode->i_size) {
253                 iinfo->i_alloc_type = alloctype;
254                 mark_inode_dirty(inode);
255                 return NULL;
256         }
257 
258         /* alloc block, and copy data to it */
259         *block = udf_new_block(inode->i_sb, inode,
260                                iinfo->i_location.partitionReferenceNum,
261                                iinfo->i_location.logicalBlockNum, err);
262         if (!(*block))
263                 return NULL;
264         newblock = udf_get_pblock(inode->i_sb, *block,
265                                   iinfo->i_location.partitionReferenceNum,
266                                 0);
267         if (!newblock)
268                 return NULL;
269         dbh = udf_tgetblk(inode->i_sb, newblock);
270         if (!dbh)
271                 return NULL;
272         lock_buffer(dbh);
273         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
274         set_buffer_uptodate(dbh);
275         unlock_buffer(dbh);
276         mark_buffer_dirty_inode(dbh, inode);
277 
278         sfibh.soffset = sfibh.eoffset =
279                         f_pos & (inode->i_sb->s_blocksize - 1);
280         sfibh.sbh = sfibh.ebh = NULL;
281         dfibh.soffset = dfibh.eoffset = 0;
282         dfibh.sbh = dfibh.ebh = dbh;
283         while (f_pos < size) {
284                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
285                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
286                                          NULL, NULL, NULL);
287                 if (!sfi) {
288                         brelse(dbh);
289                         return NULL;
290                 }
291                 iinfo->i_alloc_type = alloctype;
292                 sfi->descTag.tagLocation = cpu_to_le32(*block);
293                 dfibh.soffset = dfibh.eoffset;
294                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
295                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
296                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
297                                  sfi->fileIdent +
298                                         le16_to_cpu(sfi->lengthOfImpUse))) {
299                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
300                         brelse(dbh);
301                         return NULL;
302                 }
303         }
304         mark_buffer_dirty_inode(dbh, inode);
305 
306         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
307                 iinfo->i_lenAlloc);
308         iinfo->i_lenAlloc = 0;
309         eloc.logicalBlockNum = *block;
310         eloc.partitionReferenceNum =
311                                 iinfo->i_location.partitionReferenceNum;
312         iinfo->i_lenExtents = inode->i_size;
313         epos.bh = NULL;
314         epos.block = iinfo->i_location;
315         epos.offset = udf_file_entry_alloc_offset(inode);
316         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
317         /* UniqueID stuff */
318 
319         brelse(epos.bh);
320         mark_inode_dirty(inode);
321         return dbh;
322 }
323 
324 static int udf_get_block(struct inode *inode, sector_t block,
325                          struct buffer_head *bh_result, int create)
326 {
327         int err, new;
328         sector_t phys = 0;
329         struct udf_inode_info *iinfo;
330 
331         if (!create) {
332                 phys = udf_block_map(inode, block);
333                 if (phys)
334                         map_bh(bh_result, inode->i_sb, phys);
335                 return 0;
336         }
337 
338         err = -EIO;
339         new = 0;
340         iinfo = UDF_I(inode);
341 
342         down_write(&iinfo->i_data_sem);
343         if (block == iinfo->i_next_alloc_block + 1) {
344                 iinfo->i_next_alloc_block++;
345                 iinfo->i_next_alloc_goal++;
346         }
347 
348 
349         phys = inode_getblk(inode, block, &err, &new);
350         if (!phys)
351                 goto abort;
352 
353         if (new)
354                 set_buffer_new(bh_result);
355         map_bh(bh_result, inode->i_sb, phys);
356 
357 abort:
358         up_write(&iinfo->i_data_sem);
359         return err;
360 }
361 
362 static struct buffer_head *udf_getblk(struct inode *inode, long block,
363                                       int create, int *err)
364 {
365         struct buffer_head *bh;
366         struct buffer_head dummy;
367 
368         dummy.b_state = 0;
369         dummy.b_blocknr = -1000;
370         *err = udf_get_block(inode, block, &dummy, create);
371         if (!*err && buffer_mapped(&dummy)) {
372                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
373                 if (buffer_new(&dummy)) {
374                         lock_buffer(bh);
375                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
376                         set_buffer_uptodate(bh);
377                         unlock_buffer(bh);
378                         mark_buffer_dirty_inode(bh, inode);
379                 }
380                 return bh;
381         }
382 
383         return NULL;
384 }
385 
386 /* Extend the file by 'blocks' blocks, return the number of extents added */
387 static int udf_do_extend_file(struct inode *inode,
388                               struct extent_position *last_pos,
389                               struct kernel_long_ad *last_ext,
390                               sector_t blocks)
391 {
392         sector_t add;
393         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
394         struct super_block *sb = inode->i_sb;
395         struct kernel_lb_addr prealloc_loc = {};
396         int prealloc_len = 0;
397         struct udf_inode_info *iinfo;
398         int err;
399 
400         /* The previous extent is fake and we should not extend by anything
401          * - there's nothing to do... */
402         if (!blocks && fake)
403                 return 0;
404 
405         iinfo = UDF_I(inode);
406         /* Round the last extent up to a multiple of block size */
407         if (last_ext->extLength & (sb->s_blocksize - 1)) {
408                 last_ext->extLength =
409                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
410                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
411                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
412                 iinfo->i_lenExtents =
413                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
414                         ~(sb->s_blocksize - 1);
415         }
416 
417         /* Last extent are just preallocated blocks? */
418         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
419                                                 EXT_NOT_RECORDED_ALLOCATED) {
420                 /* Save the extent so that we can reattach it to the end */
421                 prealloc_loc = last_ext->extLocation;
422                 prealloc_len = last_ext->extLength;
423                 /* Mark the extent as a hole */
424                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
425                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
426                 last_ext->extLocation.logicalBlockNum = 0;
427                 last_ext->extLocation.partitionReferenceNum = 0;
428         }
429 
430         /* Can we merge with the previous extent? */
431         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
432                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
433                 add = ((1 << 30) - sb->s_blocksize -
434                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
435                         sb->s_blocksize_bits;
436                 if (add > blocks)
437                         add = blocks;
438                 blocks -= add;
439                 last_ext->extLength += add << sb->s_blocksize_bits;
440         }
441 
442         if (fake) {
443                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
444                              last_ext->extLength, 1);
445                 count++;
446         } else
447                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
448                                 last_ext->extLength, 1);
449 
450         /* Managed to do everything necessary? */
451         if (!blocks)
452                 goto out;
453 
454         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
455         last_ext->extLocation.logicalBlockNum = 0;
456         last_ext->extLocation.partitionReferenceNum = 0;
457         add = (1 << (30-sb->s_blocksize_bits)) - 1;
458         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
459                                 (add << sb->s_blocksize_bits);
460 
461         /* Create enough extents to cover the whole hole */
462         while (blocks > add) {
463                 blocks -= add;
464                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
465                                    last_ext->extLength, 1);
466                 if (err)
467                         return err;
468                 count++;
469         }
470         if (blocks) {
471                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
472                         (blocks << sb->s_blocksize_bits);
473                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
474                                    last_ext->extLength, 1);
475                 if (err)
476                         return err;
477                 count++;
478         }
479 
480 out:
481         /* Do we have some preallocated blocks saved? */
482         if (prealloc_len) {
483                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
484                                    prealloc_len, 1);
485                 if (err)
486                         return err;
487                 last_ext->extLocation = prealloc_loc;
488                 last_ext->extLength = prealloc_len;
489                 count++;
490         }
491 
492         /* last_pos should point to the last written extent... */
493         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
494                 last_pos->offset -= sizeof(struct short_ad);
495         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
496                 last_pos->offset -= sizeof(struct long_ad);
497         else
498                 return -EIO;
499 
500         return count;
501 }
502 
503 static int udf_extend_file(struct inode *inode, loff_t newsize)
504 {
505 
506         struct extent_position epos;
507         struct kernel_lb_addr eloc;
508         uint32_t elen;
509         int8_t etype;
510         struct super_block *sb = inode->i_sb;
511         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
512         int adsize;
513         struct udf_inode_info *iinfo = UDF_I(inode);
514         struct kernel_long_ad extent;
515         int err;
516 
517         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
518                 adsize = sizeof(struct short_ad);
519         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
520                 adsize = sizeof(struct long_ad);
521         else
522                 BUG();
523 
524         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
525 
526         /* File has extent covering the new size (could happen when extending
527          * inside a block)? */
528         if (etype != -1)
529                 return 0;
530         if (newsize & (sb->s_blocksize - 1))
531                 offset++;
532         /* Extended file just to the boundary of the last file block? */
533         if (offset == 0)
534                 return 0;
535 
536         /* Truncate is extending the file by 'offset' blocks */
537         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
538             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
539                 /* File has no extents at all or has empty last
540                  * indirect extent! Create a fake extent... */
541                 extent.extLocation.logicalBlockNum = 0;
542                 extent.extLocation.partitionReferenceNum = 0;
543                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
544         } else {
545                 epos.offset -= adsize;
546                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
547                                       &extent.extLength, 0);
548                 extent.extLength |= etype << 30;
549         }
550         err = udf_do_extend_file(inode, &epos, &extent, offset);
551         if (err < 0)
552                 goto out;
553         err = 0;
554         iinfo->i_lenExtents = newsize;
555 out:
556         brelse(epos.bh);
557         return err;
558 }
559 
560 static sector_t inode_getblk(struct inode *inode, sector_t block,
561                              int *err, int *new)
562 {
563         static sector_t last_block;
564         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
565         struct extent_position prev_epos, cur_epos, next_epos;
566         int count = 0, startnum = 0, endnum = 0;
567         uint32_t elen = 0, tmpelen;
568         struct kernel_lb_addr eloc, tmpeloc;
569         int c = 1;
570         loff_t lbcount = 0, b_off = 0;
571         uint32_t newblocknum, newblock;
572         sector_t offset = 0;
573         int8_t etype;
574         struct udf_inode_info *iinfo = UDF_I(inode);
575         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
576         int lastblock = 0;
577         bool isBeyondEOF;
578 
579         *err = 0;
580         *new = 0;
581         prev_epos.offset = udf_file_entry_alloc_offset(inode);
582         prev_epos.block = iinfo->i_location;
583         prev_epos.bh = NULL;
584         cur_epos = next_epos = prev_epos;
585         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
586 
587         /* find the extent which contains the block we are looking for.
588            alternate between laarr[0] and laarr[1] for locations of the
589            current extent, and the previous extent */
590         do {
591                 if (prev_epos.bh != cur_epos.bh) {
592                         brelse(prev_epos.bh);
593                         get_bh(cur_epos.bh);
594                         prev_epos.bh = cur_epos.bh;
595                 }
596                 if (cur_epos.bh != next_epos.bh) {
597                         brelse(cur_epos.bh);
598                         get_bh(next_epos.bh);
599                         cur_epos.bh = next_epos.bh;
600                 }
601 
602                 lbcount += elen;
603 
604                 prev_epos.block = cur_epos.block;
605                 cur_epos.block = next_epos.block;
606 
607                 prev_epos.offset = cur_epos.offset;
608                 cur_epos.offset = next_epos.offset;
609 
610                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
611                 if (etype == -1)
612                         break;
613 
614                 c = !c;
615 
616                 laarr[c].extLength = (etype << 30) | elen;
617                 laarr[c].extLocation = eloc;
618 
619                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
620                         pgoal = eloc.logicalBlockNum +
621                                 ((elen + inode->i_sb->s_blocksize - 1) >>
622                                  inode->i_sb->s_blocksize_bits);
623 
624                 count++;
625         } while (lbcount + elen <= b_off);
626 
627         b_off -= lbcount;
628         offset = b_off >> inode->i_sb->s_blocksize_bits;
629         /*
630          * Move prev_epos and cur_epos into indirect extent if we are at
631          * the pointer to it
632          */
633         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
634         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
635 
636         /* if the extent is allocated and recorded, return the block
637            if the extent is not a multiple of the blocksize, round up */
638 
639         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
640                 if (elen & (inode->i_sb->s_blocksize - 1)) {
641                         elen = EXT_RECORDED_ALLOCATED |
642                                 ((elen + inode->i_sb->s_blocksize - 1) &
643                                  ~(inode->i_sb->s_blocksize - 1));
644                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
645                 }
646                 brelse(prev_epos.bh);
647                 brelse(cur_epos.bh);
648                 brelse(next_epos.bh);
649                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
650                 return newblock;
651         }
652 
653         last_block = block;
654         /* Are we beyond EOF? */
655         if (etype == -1) {
656                 int ret;
657                 isBeyondEOF = 1;
658                 if (count) {
659                         if (c)
660                                 laarr[0] = laarr[1];
661                         startnum = 1;
662                 } else {
663                         /* Create a fake extent when there's not one */
664                         memset(&laarr[0].extLocation, 0x00,
665                                 sizeof(struct kernel_lb_addr));
666                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
667                         /* Will udf_do_extend_file() create real extent from
668                            a fake one? */
669                         startnum = (offset > 0);
670                 }
671                 /* Create extents for the hole between EOF and offset */
672                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
673                 if (ret < 0) {
674                         brelse(prev_epos.bh);
675                         brelse(cur_epos.bh);
676                         brelse(next_epos.bh);
677                         *err = ret;
678                         return 0;
679                 }
680                 c = 0;
681                 offset = 0;
682                 count += ret;
683                 /* We are not covered by a preallocated extent? */
684                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
685                                                 EXT_NOT_RECORDED_ALLOCATED) {
686                         /* Is there any real extent? - otherwise we overwrite
687                          * the fake one... */
688                         if (count)
689                                 c = !c;
690                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
691                                 inode->i_sb->s_blocksize;
692                         memset(&laarr[c].extLocation, 0x00,
693                                 sizeof(struct kernel_lb_addr));
694                         count++;
695                         endnum++;
696                 }
697                 endnum = c + 1;
698                 lastblock = 1;
699         } else {
700                 isBeyondEOF = 0;
701                 endnum = startnum = ((count > 2) ? 2 : count);
702 
703                 /* if the current extent is in position 0,
704                    swap it with the previous */
705                 if (!c && count != 1) {
706                         laarr[2] = laarr[0];
707                         laarr[0] = laarr[1];
708                         laarr[1] = laarr[2];
709                         c = 1;
710                 }
711 
712                 /* if the current block is located in an extent,
713                    read the next extent */
714                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
715                 if (etype != -1) {
716                         laarr[c + 1].extLength = (etype << 30) | elen;
717                         laarr[c + 1].extLocation = eloc;
718                         count++;
719                         startnum++;
720                         endnum++;
721                 } else
722                         lastblock = 1;
723         }
724 
725         /* if the current extent is not recorded but allocated, get the
726          * block in the extent corresponding to the requested block */
727         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
728                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
729         else { /* otherwise, allocate a new block */
730                 if (iinfo->i_next_alloc_block == block)
731                         goal = iinfo->i_next_alloc_goal;
732 
733                 if (!goal) {
734                         if (!(goal = pgoal)) /* XXX: what was intended here? */
735                                 goal = iinfo->i_location.logicalBlockNum + 1;
736                 }
737 
738                 newblocknum = udf_new_block(inode->i_sb, inode,
739                                 iinfo->i_location.partitionReferenceNum,
740                                 goal, err);
741                 if (!newblocknum) {
742                         brelse(prev_epos.bh);
743                         brelse(cur_epos.bh);
744                         brelse(next_epos.bh);
745                         *err = -ENOSPC;
746                         return 0;
747                 }
748                 if (isBeyondEOF)
749                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
750         }
751 
752         /* if the extent the requsted block is located in contains multiple
753          * blocks, split the extent into at most three extents. blocks prior
754          * to requested block, requested block, and blocks after requested
755          * block */
756         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
757 
758 #ifdef UDF_PREALLOCATE
759         /* We preallocate blocks only for regular files. It also makes sense
760          * for directories but there's a problem when to drop the
761          * preallocation. We might use some delayed work for that but I feel
762          * it's overengineering for a filesystem like UDF. */
763         if (S_ISREG(inode->i_mode))
764                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
765 #endif
766 
767         /* merge any continuous blocks in laarr */
768         udf_merge_extents(inode, laarr, &endnum);
769 
770         /* write back the new extents, inserting new extents if the new number
771          * of extents is greater than the old number, and deleting extents if
772          * the new number of extents is less than the old number */
773         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
774 
775         brelse(prev_epos.bh);
776         brelse(cur_epos.bh);
777         brelse(next_epos.bh);
778 
779         newblock = udf_get_pblock(inode->i_sb, newblocknum,
780                                 iinfo->i_location.partitionReferenceNum, 0);
781         if (!newblock) {
782                 *err = -EIO;
783                 return 0;
784         }
785         *new = 1;
786         iinfo->i_next_alloc_block = block;
787         iinfo->i_next_alloc_goal = newblocknum;
788         inode->i_ctime = current_fs_time(inode->i_sb);
789 
790         if (IS_SYNC(inode))
791                 udf_sync_inode(inode);
792         else
793                 mark_inode_dirty(inode);
794 
795         return newblock;
796 }
797 
798 static void udf_split_extents(struct inode *inode, int *c, int offset,
799                               int newblocknum,
800                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
801                               int *endnum)
802 {
803         unsigned long blocksize = inode->i_sb->s_blocksize;
804         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
805 
806         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
807             (laarr[*c].extLength >> 30) ==
808                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
809                 int curr = *c;
810                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
811                             blocksize - 1) >> blocksize_bits;
812                 int8_t etype = (laarr[curr].extLength >> 30);
813 
814                 if (blen == 1)
815                         ;
816                 else if (!offset || blen == offset + 1) {
817                         laarr[curr + 2] = laarr[curr + 1];
818                         laarr[curr + 1] = laarr[curr];
819                 } else {
820                         laarr[curr + 3] = laarr[curr + 1];
821                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
822                 }
823 
824                 if (offset) {
825                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
826                                 udf_free_blocks(inode->i_sb, inode,
827                                                 &laarr[curr].extLocation,
828                                                 0, offset);
829                                 laarr[curr].extLength =
830                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
831                                         (offset << blocksize_bits);
832                                 laarr[curr].extLocation.logicalBlockNum = 0;
833                                 laarr[curr].extLocation.
834                                                 partitionReferenceNum = 0;
835                         } else
836                                 laarr[curr].extLength = (etype << 30) |
837                                         (offset << blocksize_bits);
838                         curr++;
839                         (*c)++;
840                         (*endnum)++;
841                 }
842 
843                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
844                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
845                         laarr[curr].extLocation.partitionReferenceNum =
846                                 UDF_I(inode)->i_location.partitionReferenceNum;
847                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
848                         blocksize;
849                 curr++;
850 
851                 if (blen != offset + 1) {
852                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
853                                 laarr[curr].extLocation.logicalBlockNum +=
854                                                                 offset + 1;
855                         laarr[curr].extLength = (etype << 30) |
856                                 ((blen - (offset + 1)) << blocksize_bits);
857                         curr++;
858                         (*endnum)++;
859                 }
860         }
861 }
862 
863 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
864                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
865                                  int *endnum)
866 {
867         int start, length = 0, currlength = 0, i;
868 
869         if (*endnum >= (c + 1)) {
870                 if (!lastblock)
871                         return;
872                 else
873                         start = c;
874         } else {
875                 if ((laarr[c + 1].extLength >> 30) ==
876                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
877                         start = c + 1;
878                         length = currlength =
879                                 (((laarr[c + 1].extLength &
880                                         UDF_EXTENT_LENGTH_MASK) +
881                                 inode->i_sb->s_blocksize - 1) >>
882                                 inode->i_sb->s_blocksize_bits);
883                 } else
884                         start = c;
885         }
886 
887         for (i = start + 1; i <= *endnum; i++) {
888                 if (i == *endnum) {
889                         if (lastblock)
890                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
891                 } else if ((laarr[i].extLength >> 30) ==
892                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
893                         length += (((laarr[i].extLength &
894                                                 UDF_EXTENT_LENGTH_MASK) +
895                                     inode->i_sb->s_blocksize - 1) >>
896                                     inode->i_sb->s_blocksize_bits);
897                 } else
898                         break;
899         }
900 
901         if (length) {
902                 int next = laarr[start].extLocation.logicalBlockNum +
903                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
904                           inode->i_sb->s_blocksize - 1) >>
905                           inode->i_sb->s_blocksize_bits);
906                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
907                                 laarr[start].extLocation.partitionReferenceNum,
908                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
909                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
910                                 currlength);
911                 if (numalloc)   {
912                         if (start == (c + 1))
913                                 laarr[start].extLength +=
914                                         (numalloc <<
915                                          inode->i_sb->s_blocksize_bits);
916                         else {
917                                 memmove(&laarr[c + 2], &laarr[c + 1],
918                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
919                                 (*endnum)++;
920                                 laarr[c + 1].extLocation.logicalBlockNum = next;
921                                 laarr[c + 1].extLocation.partitionReferenceNum =
922                                         laarr[c].extLocation.
923                                                         partitionReferenceNum;
924                                 laarr[c + 1].extLength =
925                                         EXT_NOT_RECORDED_ALLOCATED |
926                                         (numalloc <<
927                                          inode->i_sb->s_blocksize_bits);
928                                 start = c + 1;
929                         }
930 
931                         for (i = start + 1; numalloc && i < *endnum; i++) {
932                                 int elen = ((laarr[i].extLength &
933                                                 UDF_EXTENT_LENGTH_MASK) +
934                                             inode->i_sb->s_blocksize - 1) >>
935                                             inode->i_sb->s_blocksize_bits;
936 
937                                 if (elen > numalloc) {
938                                         laarr[i].extLength -=
939                                                 (numalloc <<
940                                                  inode->i_sb->s_blocksize_bits);
941                                         numalloc = 0;
942                                 } else {
943                                         numalloc -= elen;
944                                         if (*endnum > (i + 1))
945                                                 memmove(&laarr[i],
946                                                         &laarr[i + 1],
947                                                         sizeof(struct long_ad) *
948                                                         (*endnum - (i + 1)));
949                                         i--;
950                                         (*endnum)--;
951                                 }
952                         }
953                         UDF_I(inode)->i_lenExtents +=
954                                 numalloc << inode->i_sb->s_blocksize_bits;
955                 }
956         }
957 }
958 
959 static void udf_merge_extents(struct inode *inode,
960                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
961                               int *endnum)
962 {
963         int i;
964         unsigned long blocksize = inode->i_sb->s_blocksize;
965         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
966 
967         for (i = 0; i < (*endnum - 1); i++) {
968                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
969                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
970 
971                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
972                         (((li->extLength >> 30) ==
973                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
974                         ((lip1->extLocation.logicalBlockNum -
975                           li->extLocation.logicalBlockNum) ==
976                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
977                         blocksize - 1) >> blocksize_bits)))) {
978 
979                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
980                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
981                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
982                                 lip1->extLength = (lip1->extLength -
983                                                   (li->extLength &
984                                                    UDF_EXTENT_LENGTH_MASK) +
985                                                    UDF_EXTENT_LENGTH_MASK) &
986                                                         ~(blocksize - 1);
987                                 li->extLength = (li->extLength &
988                                                  UDF_EXTENT_FLAG_MASK) +
989                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
990                                                 blocksize;
991                                 lip1->extLocation.logicalBlockNum =
992                                         li->extLocation.logicalBlockNum +
993                                         ((li->extLength &
994                                                 UDF_EXTENT_LENGTH_MASK) >>
995                                                 blocksize_bits);
996                         } else {
997                                 li->extLength = lip1->extLength +
998                                         (((li->extLength &
999                                                 UDF_EXTENT_LENGTH_MASK) +
1000                                          blocksize - 1) & ~(blocksize - 1));
1001                                 if (*endnum > (i + 2))
1002                                         memmove(&laarr[i + 1], &laarr[i + 2],
1003                                                 sizeof(struct long_ad) *
1004                                                 (*endnum - (i + 2)));
1005                                 i--;
1006                                 (*endnum)--;
1007                         }
1008                 } else if (((li->extLength >> 30) ==
1009                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1010                            ((lip1->extLength >> 30) ==
1011                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1012                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1013                                         ((li->extLength &
1014                                           UDF_EXTENT_LENGTH_MASK) +
1015                                          blocksize - 1) >> blocksize_bits);
1016                         li->extLocation.logicalBlockNum = 0;
1017                         li->extLocation.partitionReferenceNum = 0;
1018 
1019                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1020                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1021                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1022                                 lip1->extLength = (lip1->extLength -
1023                                                    (li->extLength &
1024                                                    UDF_EXTENT_LENGTH_MASK) +
1025                                                    UDF_EXTENT_LENGTH_MASK) &
1026                                                    ~(blocksize - 1);
1027                                 li->extLength = (li->extLength &
1028                                                  UDF_EXTENT_FLAG_MASK) +
1029                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1030                                                 blocksize;
1031                         } else {
1032                                 li->extLength = lip1->extLength +
1033                                         (((li->extLength &
1034                                                 UDF_EXTENT_LENGTH_MASK) +
1035                                           blocksize - 1) & ~(blocksize - 1));
1036                                 if (*endnum > (i + 2))
1037                                         memmove(&laarr[i + 1], &laarr[i + 2],
1038                                                 sizeof(struct long_ad) *
1039                                                 (*endnum - (i + 2)));
1040                                 i--;
1041                                 (*endnum)--;
1042                         }
1043                 } else if ((li->extLength >> 30) ==
1044                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1045                         udf_free_blocks(inode->i_sb, inode,
1046                                         &li->extLocation, 0,
1047                                         ((li->extLength &
1048                                                 UDF_EXTENT_LENGTH_MASK) +
1049                                          blocksize - 1) >> blocksize_bits);
1050                         li->extLocation.logicalBlockNum = 0;
1051                         li->extLocation.partitionReferenceNum = 0;
1052                         li->extLength = (li->extLength &
1053                                                 UDF_EXTENT_LENGTH_MASK) |
1054                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1055                 }
1056         }
1057 }
1058 
1059 static void udf_update_extents(struct inode *inode,
1060                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1061                                int startnum, int endnum,
1062                                struct extent_position *epos)
1063 {
1064         int start = 0, i;
1065         struct kernel_lb_addr tmploc;
1066         uint32_t tmplen;
1067 
1068         if (startnum > endnum) {
1069                 for (i = 0; i < (startnum - endnum); i++)
1070                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1071                                         laarr[i].extLength);
1072         } else if (startnum < endnum) {
1073                 for (i = 0; i < (endnum - startnum); i++) {
1074                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1075                                         laarr[i].extLength);
1076                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1077                                       &laarr[i].extLength, 1);
1078                         start++;
1079                 }
1080         }
1081 
1082         for (i = start; i < endnum; i++) {
1083                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1084                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1085                                laarr[i].extLength, 1);
1086         }
1087 }
1088 
1089 struct buffer_head *udf_bread(struct inode *inode, int block,
1090                               int create, int *err)
1091 {
1092         struct buffer_head *bh = NULL;
1093 
1094         bh = udf_getblk(inode, block, create, err);
1095         if (!bh)
1096                 return NULL;
1097 
1098         if (buffer_uptodate(bh))
1099                 return bh;
1100 
1101         ll_rw_block(READ, 1, &bh);
1102 
1103         wait_on_buffer(bh);
1104         if (buffer_uptodate(bh))
1105                 return bh;
1106 
1107         brelse(bh);
1108         *err = -EIO;
1109         return NULL;
1110 }
1111 
1112 int udf_setsize(struct inode *inode, loff_t newsize)
1113 {
1114         int err;
1115         struct udf_inode_info *iinfo;
1116         int bsize = 1 << inode->i_blkbits;
1117 
1118         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1119               S_ISLNK(inode->i_mode)))
1120                 return -EINVAL;
1121         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1122                 return -EPERM;
1123 
1124         iinfo = UDF_I(inode);
1125         if (newsize > inode->i_size) {
1126                 down_write(&iinfo->i_data_sem);
1127                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1128                         if (bsize <
1129                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1130                                 err = udf_expand_file_adinicb(inode);
1131                                 if (err)
1132                                         return err;
1133                                 down_write(&iinfo->i_data_sem);
1134                         } else
1135                                 iinfo->i_lenAlloc = newsize;
1136                 }
1137                 err = udf_extend_file(inode, newsize);
1138                 if (err) {
1139                         up_write(&iinfo->i_data_sem);
1140                         return err;
1141                 }
1142                 truncate_setsize(inode, newsize);
1143                 up_write(&iinfo->i_data_sem);
1144         } else {
1145                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1146                         down_write(&iinfo->i_data_sem);
1147                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1148                                0x00, bsize - newsize -
1149                                udf_file_entry_alloc_offset(inode));
1150                         iinfo->i_lenAlloc = newsize;
1151                         truncate_setsize(inode, newsize);
1152                         up_write(&iinfo->i_data_sem);
1153                         goto update_time;
1154                 }
1155                 err = block_truncate_page(inode->i_mapping, newsize,
1156                                           udf_get_block);
1157                 if (err)
1158                         return err;
1159                 down_write(&iinfo->i_data_sem);
1160                 truncate_setsize(inode, newsize);
1161                 udf_truncate_extents(inode);
1162                 up_write(&iinfo->i_data_sem);
1163         }
1164 update_time:
1165         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1166         if (IS_SYNC(inode))
1167                 udf_sync_inode(inode);
1168         else
1169                 mark_inode_dirty(inode);
1170         return 0;
1171 }
1172 
1173 static void __udf_read_inode(struct inode *inode)
1174 {
1175         struct buffer_head *bh = NULL;
1176         struct fileEntry *fe;
1177         uint16_t ident;
1178         struct udf_inode_info *iinfo = UDF_I(inode);
1179 
1180         /*
1181          * Set defaults, but the inode is still incomplete!
1182          * Note: get_new_inode() sets the following on a new inode:
1183          *      i_sb = sb
1184          *      i_no = ino
1185          *      i_flags = sb->s_flags
1186          *      i_state = 0
1187          * clean_inode(): zero fills and sets
1188          *      i_count = 1
1189          *      i_nlink = 1
1190          *      i_op = NULL;
1191          */
1192         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1193         if (!bh) {
1194                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1195                 make_bad_inode(inode);
1196                 return;
1197         }
1198 
1199         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1200             ident != TAG_IDENT_USE) {
1201                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1202                         inode->i_ino, ident);
1203                 brelse(bh);
1204                 make_bad_inode(inode);
1205                 return;
1206         }
1207 
1208         fe = (struct fileEntry *)bh->b_data;
1209 
1210         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1211                 struct buffer_head *ibh;
1212 
1213                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1214                                         &ident);
1215                 if (ident == TAG_IDENT_IE && ibh) {
1216                         struct buffer_head *nbh = NULL;
1217                         struct kernel_lb_addr loc;
1218                         struct indirectEntry *ie;
1219 
1220                         ie = (struct indirectEntry *)ibh->b_data;
1221                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1222 
1223                         if (ie->indirectICB.extLength &&
1224                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1225                                                         &ident))) {
1226                                 if (ident == TAG_IDENT_FE ||
1227                                         ident == TAG_IDENT_EFE) {
1228                                         memcpy(&iinfo->i_location,
1229                                                 &loc,
1230                                                 sizeof(struct kernel_lb_addr));
1231                                         brelse(bh);
1232                                         brelse(ibh);
1233                                         brelse(nbh);
1234                                         __udf_read_inode(inode);
1235                                         return;
1236                                 }
1237                                 brelse(nbh);
1238                         }
1239                 }
1240                 brelse(ibh);
1241         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1242                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1243                         le16_to_cpu(fe->icbTag.strategyType));
1244                 brelse(bh);
1245                 make_bad_inode(inode);
1246                 return;
1247         }
1248         udf_fill_inode(inode, bh);
1249 
1250         brelse(bh);
1251 }
1252 
1253 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1254 {
1255         struct fileEntry *fe;
1256         struct extendedFileEntry *efe;
1257         int offset;
1258         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1259         struct udf_inode_info *iinfo = UDF_I(inode);
1260         unsigned int link_count;
1261 
1262         fe = (struct fileEntry *)bh->b_data;
1263         efe = (struct extendedFileEntry *)bh->b_data;
1264 
1265         if (fe->icbTag.strategyType == cpu_to_le16(4))
1266                 iinfo->i_strat4096 = 0;
1267         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1268                 iinfo->i_strat4096 = 1;
1269 
1270         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1271                                                         ICBTAG_FLAG_AD_MASK;
1272         iinfo->i_unique = 0;
1273         iinfo->i_lenEAttr = 0;
1274         iinfo->i_lenExtents = 0;
1275         iinfo->i_lenAlloc = 0;
1276         iinfo->i_next_alloc_block = 0;
1277         iinfo->i_next_alloc_goal = 0;
1278         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1279                 iinfo->i_efe = 1;
1280                 iinfo->i_use = 0;
1281                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1282                                         sizeof(struct extendedFileEntry))) {
1283                         make_bad_inode(inode);
1284                         return;
1285                 }
1286                 memcpy(iinfo->i_ext.i_data,
1287                        bh->b_data + sizeof(struct extendedFileEntry),
1288                        inode->i_sb->s_blocksize -
1289                                         sizeof(struct extendedFileEntry));
1290         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1291                 iinfo->i_efe = 0;
1292                 iinfo->i_use = 0;
1293                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1294                                                 sizeof(struct fileEntry))) {
1295                         make_bad_inode(inode);
1296                         return;
1297                 }
1298                 memcpy(iinfo->i_ext.i_data,
1299                        bh->b_data + sizeof(struct fileEntry),
1300                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1301         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1302                 iinfo->i_efe = 0;
1303                 iinfo->i_use = 1;
1304                 iinfo->i_lenAlloc = le32_to_cpu(
1305                                 ((struct unallocSpaceEntry *)bh->b_data)->
1306                                  lengthAllocDescs);
1307                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1308                                         sizeof(struct unallocSpaceEntry))) {
1309                         make_bad_inode(inode);
1310                         return;
1311                 }
1312                 memcpy(iinfo->i_ext.i_data,
1313                        bh->b_data + sizeof(struct unallocSpaceEntry),
1314                        inode->i_sb->s_blocksize -
1315                                         sizeof(struct unallocSpaceEntry));
1316                 return;
1317         }
1318 
1319         read_lock(&sbi->s_cred_lock);
1320         inode->i_uid = le32_to_cpu(fe->uid);
1321         if (inode->i_uid == -1 ||
1322             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1323             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1324                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1325 
1326         inode->i_gid = le32_to_cpu(fe->gid);
1327         if (inode->i_gid == -1 ||
1328             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1329             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1330                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1331 
1332         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1333                         sbi->s_fmode != UDF_INVALID_MODE)
1334                 inode->i_mode = sbi->s_fmode;
1335         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1336                         sbi->s_dmode != UDF_INVALID_MODE)
1337                 inode->i_mode = sbi->s_dmode;
1338         else
1339                 inode->i_mode = udf_convert_permissions(fe);
1340         inode->i_mode &= ~sbi->s_umask;
1341         read_unlock(&sbi->s_cred_lock);
1342 
1343         link_count = le16_to_cpu(fe->fileLinkCount);
1344         if (!link_count)
1345                 link_count = 1;
1346         set_nlink(inode, link_count);
1347 
1348         inode->i_size = le64_to_cpu(fe->informationLength);
1349         iinfo->i_lenExtents = inode->i_size;
1350 
1351         if (iinfo->i_efe == 0) {
1352                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1353                         (inode->i_sb->s_blocksize_bits - 9);
1354 
1355                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1356                         inode->i_atime = sbi->s_record_time;
1357 
1358                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1359                                             fe->modificationTime))
1360                         inode->i_mtime = sbi->s_record_time;
1361 
1362                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1363                         inode->i_ctime = sbi->s_record_time;
1364 
1365                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1366                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1367                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1368                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1369                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1370         } else {
1371                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1372                     (inode->i_sb->s_blocksize_bits - 9);
1373 
1374                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1375                         inode->i_atime = sbi->s_record_time;
1376 
1377                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1378                                             efe->modificationTime))
1379                         inode->i_mtime = sbi->s_record_time;
1380 
1381                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1382                         iinfo->i_crtime = sbi->s_record_time;
1383 
1384                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1385                         inode->i_ctime = sbi->s_record_time;
1386 
1387                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1388                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1389                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1390                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1391                 offset = sizeof(struct extendedFileEntry) +
1392                                                         iinfo->i_lenEAttr;
1393         }
1394 
1395         /*
1396          * Sanity check length of allocation descriptors and extended attrs to
1397          * avoid integer overflows
1398          */
1399         if (iinfo->i_lenEAttr > inode->i_sb->s_blocksize || iinfo->i_lenAlloc > inode->i_sb->s_blocksize) {
1400                 make_bad_inode(inode);
1401                 return;
1402         }
1403         /* Now do exact checks */
1404         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > inode->i_sb->s_blocksize) {
1405                 make_bad_inode(inode);
1406                 return;
1407         }
1408         /* Sanity checks for files in ICB so that we don't get confused later */
1409         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1410                 /*
1411                  * For file in ICB data is stored in allocation descriptor
1412                  * so sizes should match
1413                  */
1414                 if (iinfo->i_lenAlloc != inode->i_size)
1415                         return;
1416                 /* File in ICB has to fit in there... */
1417                 if (inode->i_size > inode->i_sb->s_blocksize -
1418                                         udf_file_entry_alloc_offset(inode))
1419                         return;
1420         }
1421 
1422         switch (fe->icbTag.fileType) {
1423         case ICBTAG_FILE_TYPE_DIRECTORY:
1424                 inode->i_op = &udf_dir_inode_operations;
1425                 inode->i_fop = &udf_dir_operations;
1426                 inode->i_mode |= S_IFDIR;
1427                 inc_nlink(inode);
1428                 break;
1429         case ICBTAG_FILE_TYPE_REALTIME:
1430         case ICBTAG_FILE_TYPE_REGULAR:
1431         case ICBTAG_FILE_TYPE_UNDEF:
1432         case ICBTAG_FILE_TYPE_VAT20:
1433                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1434                         inode->i_data.a_ops = &udf_adinicb_aops;
1435                 else
1436                         inode->i_data.a_ops = &udf_aops;
1437                 inode->i_op = &udf_file_inode_operations;
1438                 inode->i_fop = &udf_file_operations;
1439                 inode->i_mode |= S_IFREG;
1440                 break;
1441         case ICBTAG_FILE_TYPE_BLOCK:
1442                 inode->i_mode |= S_IFBLK;
1443                 break;
1444         case ICBTAG_FILE_TYPE_CHAR:
1445                 inode->i_mode |= S_IFCHR;
1446                 break;
1447         case ICBTAG_FILE_TYPE_FIFO:
1448                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1449                 break;
1450         case ICBTAG_FILE_TYPE_SOCKET:
1451                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1452                 break;
1453         case ICBTAG_FILE_TYPE_SYMLINK:
1454                 inode->i_data.a_ops = &udf_symlink_aops;
1455                 inode->i_op = &udf_symlink_inode_operations;
1456                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1457                 break;
1458         case ICBTAG_FILE_TYPE_MAIN:
1459                 udf_debug("METADATA FILE-----\n");
1460                 break;
1461         case ICBTAG_FILE_TYPE_MIRROR:
1462                 udf_debug("METADATA MIRROR FILE-----\n");
1463                 break;
1464         case ICBTAG_FILE_TYPE_BITMAP:
1465                 udf_debug("METADATA BITMAP FILE-----\n");
1466                 break;
1467         default:
1468                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1469                         inode->i_ino, fe->icbTag.fileType);
1470                 make_bad_inode(inode);
1471                 return;
1472         }
1473         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1474                 struct deviceSpec *dsea =
1475                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1476                 if (dsea) {
1477                         init_special_inode(inode, inode->i_mode,
1478                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1479                                       le32_to_cpu(dsea->minorDeviceIdent)));
1480                         /* Developer ID ??? */
1481                 } else
1482                         make_bad_inode(inode);
1483         }
1484 }
1485 
1486 static int udf_alloc_i_data(struct inode *inode, size_t size)
1487 {
1488         struct udf_inode_info *iinfo = UDF_I(inode);
1489         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1490 
1491         if (!iinfo->i_ext.i_data) {
1492                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1493                         inode->i_ino);
1494                 return -ENOMEM;
1495         }
1496 
1497         return 0;
1498 }
1499 
1500 static umode_t udf_convert_permissions(struct fileEntry *fe)
1501 {
1502         umode_t mode;
1503         uint32_t permissions;
1504         uint32_t flags;
1505 
1506         permissions = le32_to_cpu(fe->permissions);
1507         flags = le16_to_cpu(fe->icbTag.flags);
1508 
1509         mode =  ((permissions) & S_IRWXO) |
1510                 ((permissions >> 2) & S_IRWXG) |
1511                 ((permissions >> 4) & S_IRWXU) |
1512                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1513                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1514                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1515 
1516         return mode;
1517 }
1518 
1519 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1520 {
1521         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1522 }
1523 
1524 static int udf_sync_inode(struct inode *inode)
1525 {
1526         return udf_update_inode(inode, 1);
1527 }
1528 
1529 static int udf_update_inode(struct inode *inode, int do_sync)
1530 {
1531         struct buffer_head *bh = NULL;
1532         struct fileEntry *fe;
1533         struct extendedFileEntry *efe;
1534         uint64_t lb_recorded;
1535         uint32_t udfperms;
1536         uint16_t icbflags;
1537         uint16_t crclen;
1538         int err = 0;
1539         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1540         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1541         struct udf_inode_info *iinfo = UDF_I(inode);
1542 
1543         bh = udf_tgetblk(inode->i_sb,
1544                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1545         if (!bh) {
1546                 udf_debug("getblk failure\n");
1547                 return -ENOMEM;
1548         }
1549 
1550         lock_buffer(bh);
1551         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1552         fe = (struct fileEntry *)bh->b_data;
1553         efe = (struct extendedFileEntry *)bh->b_data;
1554 
1555         if (iinfo->i_use) {
1556                 struct unallocSpaceEntry *use =
1557                         (struct unallocSpaceEntry *)bh->b_data;
1558 
1559                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1560                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1561                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1562                                         sizeof(struct unallocSpaceEntry));
1563                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1564                 use->descTag.tagLocation =
1565                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1566                 crclen = sizeof(struct unallocSpaceEntry) +
1567                                 iinfo->i_lenAlloc - sizeof(struct tag);
1568                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1569                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1570                                                            sizeof(struct tag),
1571                                                            crclen));
1572                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1573 
1574                 goto out;
1575         }
1576 
1577         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1578                 fe->uid = cpu_to_le32(-1);
1579         else
1580                 fe->uid = cpu_to_le32(inode->i_uid);
1581 
1582         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1583                 fe->gid = cpu_to_le32(-1);
1584         else
1585                 fe->gid = cpu_to_le32(inode->i_gid);
1586 
1587         udfperms = ((inode->i_mode & S_IRWXO)) |
1588                    ((inode->i_mode & S_IRWXG) << 2) |
1589                    ((inode->i_mode & S_IRWXU) << 4);
1590 
1591         udfperms |= (le32_to_cpu(fe->permissions) &
1592                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1593                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1594                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1595         fe->permissions = cpu_to_le32(udfperms);
1596 
1597         if (S_ISDIR(inode->i_mode))
1598                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1599         else
1600                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1601 
1602         fe->informationLength = cpu_to_le64(inode->i_size);
1603 
1604         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1605                 struct regid *eid;
1606                 struct deviceSpec *dsea =
1607                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1608                 if (!dsea) {
1609                         dsea = (struct deviceSpec *)
1610                                 udf_add_extendedattr(inode,
1611                                                      sizeof(struct deviceSpec) +
1612                                                      sizeof(struct regid), 12, 0x3);
1613                         dsea->attrType = cpu_to_le32(12);
1614                         dsea->attrSubtype = 1;
1615                         dsea->attrLength = cpu_to_le32(
1616                                                 sizeof(struct deviceSpec) +
1617                                                 sizeof(struct regid));
1618                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1619                 }
1620                 eid = (struct regid *)dsea->impUse;
1621                 memset(eid, 0, sizeof(struct regid));
1622                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1623                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1624                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1625                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1626                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1627         }
1628 
1629         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1630                 lb_recorded = 0; /* No extents => no blocks! */
1631         else
1632                 lb_recorded =
1633                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1634                         (blocksize_bits - 9);
1635 
1636         if (iinfo->i_efe == 0) {
1637                 memcpy(bh->b_data + sizeof(struct fileEntry),
1638                        iinfo->i_ext.i_data,
1639                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1640                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1641 
1642                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1643                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1644                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1645                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1646                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1647                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1648                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1649                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1650                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1651                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1652                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1653                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1654                 crclen = sizeof(struct fileEntry);
1655         } else {
1656                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1657                        iinfo->i_ext.i_data,
1658                        inode->i_sb->s_blocksize -
1659                                         sizeof(struct extendedFileEntry));
1660                 efe->objectSize = cpu_to_le64(inode->i_size);
1661                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1662 
1663                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1664                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1665                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1666                         iinfo->i_crtime = inode->i_atime;
1667 
1668                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1669                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1670                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1671                         iinfo->i_crtime = inode->i_mtime;
1672 
1673                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1674                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1675                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1676                         iinfo->i_crtime = inode->i_ctime;
1677 
1678                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1679                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1680                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1681                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1682 
1683                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1684                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1685                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1686                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1687                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1688                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1689                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1690                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1691                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1692                 crclen = sizeof(struct extendedFileEntry);
1693         }
1694         if (iinfo->i_strat4096) {
1695                 fe->icbTag.strategyType = cpu_to_le16(4096);
1696                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1697                 fe->icbTag.numEntries = cpu_to_le16(2);
1698         } else {
1699                 fe->icbTag.strategyType = cpu_to_le16(4);
1700                 fe->icbTag.numEntries = cpu_to_le16(1);
1701         }
1702 
1703         if (S_ISDIR(inode->i_mode))
1704                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1705         else if (S_ISREG(inode->i_mode))
1706                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1707         else if (S_ISLNK(inode->i_mode))
1708                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1709         else if (S_ISBLK(inode->i_mode))
1710                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1711         else if (S_ISCHR(inode->i_mode))
1712                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1713         else if (S_ISFIFO(inode->i_mode))
1714                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1715         else if (S_ISSOCK(inode->i_mode))
1716                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1717 
1718         icbflags =      iinfo->i_alloc_type |
1719                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1720                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1721                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1722                         (le16_to_cpu(fe->icbTag.flags) &
1723                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1724                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1725 
1726         fe->icbTag.flags = cpu_to_le16(icbflags);
1727         if (sbi->s_udfrev >= 0x0200)
1728                 fe->descTag.descVersion = cpu_to_le16(3);
1729         else
1730                 fe->descTag.descVersion = cpu_to_le16(2);
1731         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1732         fe->descTag.tagLocation = cpu_to_le32(
1733                                         iinfo->i_location.logicalBlockNum);
1734         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1735         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1736         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1737                                                   crclen));
1738         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1739 
1740 out:
1741         set_buffer_uptodate(bh);
1742         unlock_buffer(bh);
1743 
1744         /* write the data blocks */
1745         mark_buffer_dirty(bh);
1746         if (do_sync) {
1747                 sync_dirty_buffer(bh);
1748                 if (buffer_write_io_error(bh)) {
1749                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1750                                  inode->i_ino);
1751                         err = -EIO;
1752                 }
1753         }
1754         brelse(bh);
1755 
1756         return err;
1757 }
1758 
1759 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1760 {
1761         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1762         struct inode *inode = iget_locked(sb, block);
1763 
1764         if (!inode)
1765                 return NULL;
1766 
1767         if (inode->i_state & I_NEW) {
1768                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1769                 __udf_read_inode(inode);
1770                 unlock_new_inode(inode);
1771         }
1772 
1773         if (is_bad_inode(inode))
1774                 goto out_iput;
1775 
1776         if (ino->logicalBlockNum >= UDF_SB(sb)->
1777                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1778                 udf_debug("block=%d, partition=%d out of range\n",
1779                           ino->logicalBlockNum, ino->partitionReferenceNum);
1780                 make_bad_inode(inode);
1781                 goto out_iput;
1782         }
1783 
1784         return inode;
1785 
1786  out_iput:
1787         iput(inode);
1788         return NULL;
1789 }
1790 
1791 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1792                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1793 {
1794         int adsize;
1795         struct short_ad *sad = NULL;
1796         struct long_ad *lad = NULL;
1797         struct allocExtDesc *aed;
1798         uint8_t *ptr;
1799         struct udf_inode_info *iinfo = UDF_I(inode);
1800 
1801         if (!epos->bh)
1802                 ptr = iinfo->i_ext.i_data + epos->offset -
1803                         udf_file_entry_alloc_offset(inode) +
1804                         iinfo->i_lenEAttr;
1805         else
1806                 ptr = epos->bh->b_data + epos->offset;
1807 
1808         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1809                 adsize = sizeof(struct short_ad);
1810         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1811                 adsize = sizeof(struct long_ad);
1812         else
1813                 return -EIO;
1814 
1815         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1816                 unsigned char *sptr, *dptr;
1817                 struct buffer_head *nbh;
1818                 int err, loffset;
1819                 struct kernel_lb_addr obloc = epos->block;
1820 
1821                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1822                                                 obloc.partitionReferenceNum,
1823                                                 obloc.logicalBlockNum, &err);
1824                 if (!epos->block.logicalBlockNum)
1825                         return -ENOSPC;
1826                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1827                                                                  &epos->block,
1828                                                                  0));
1829                 if (!nbh)
1830                         return -EIO;
1831                 lock_buffer(nbh);
1832                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1833                 set_buffer_uptodate(nbh);
1834                 unlock_buffer(nbh);
1835                 mark_buffer_dirty_inode(nbh, inode);
1836 
1837                 aed = (struct allocExtDesc *)(nbh->b_data);
1838                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1839                         aed->previousAllocExtLocation =
1840                                         cpu_to_le32(obloc.logicalBlockNum);
1841                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1842                         loffset = epos->offset;
1843                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1844                         sptr = ptr - adsize;
1845                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1846                         memcpy(dptr, sptr, adsize);
1847                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1848                 } else {
1849                         loffset = epos->offset + adsize;
1850                         aed->lengthAllocDescs = cpu_to_le32(0);
1851                         sptr = ptr;
1852                         epos->offset = sizeof(struct allocExtDesc);
1853 
1854                         if (epos->bh) {
1855                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1856                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1857                         } else {
1858                                 iinfo->i_lenAlloc += adsize;
1859                                 mark_inode_dirty(inode);
1860                         }
1861                 }
1862                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1863                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1864                                     epos->block.logicalBlockNum, sizeof(struct tag));
1865                 else
1866                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1867                                     epos->block.logicalBlockNum, sizeof(struct tag));
1868                 switch (iinfo->i_alloc_type) {
1869                 case ICBTAG_FLAG_AD_SHORT:
1870                         sad = (struct short_ad *)sptr;
1871                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1872                                                      inode->i_sb->s_blocksize);
1873                         sad->extPosition =
1874                                 cpu_to_le32(epos->block.logicalBlockNum);
1875                         break;
1876                 case ICBTAG_FLAG_AD_LONG:
1877                         lad = (struct long_ad *)sptr;
1878                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1879                                                      inode->i_sb->s_blocksize);
1880                         lad->extLocation = cpu_to_lelb(epos->block);
1881                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1882                         break;
1883                 }
1884                 if (epos->bh) {
1885                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1886                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1887                                 udf_update_tag(epos->bh->b_data, loffset);
1888                         else
1889                                 udf_update_tag(epos->bh->b_data,
1890                                                 sizeof(struct allocExtDesc));
1891                         mark_buffer_dirty_inode(epos->bh, inode);
1892                         brelse(epos->bh);
1893                 } else {
1894                         mark_inode_dirty(inode);
1895                 }
1896                 epos->bh = nbh;
1897         }
1898 
1899         udf_write_aext(inode, epos, eloc, elen, inc);
1900 
1901         if (!epos->bh) {
1902                 iinfo->i_lenAlloc += adsize;
1903                 mark_inode_dirty(inode);
1904         } else {
1905                 aed = (struct allocExtDesc *)epos->bh->b_data;
1906                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1907                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1908                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1909                         udf_update_tag(epos->bh->b_data,
1910                                         epos->offset + (inc ? 0 : adsize));
1911                 else
1912                         udf_update_tag(epos->bh->b_data,
1913                                         sizeof(struct allocExtDesc));
1914                 mark_buffer_dirty_inode(epos->bh, inode);
1915         }
1916 
1917         return 0;
1918 }
1919 
1920 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1921                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1922 {
1923         int adsize;
1924         uint8_t *ptr;
1925         struct short_ad *sad;
1926         struct long_ad *lad;
1927         struct udf_inode_info *iinfo = UDF_I(inode);
1928 
1929         if (!epos->bh)
1930                 ptr = iinfo->i_ext.i_data + epos->offset -
1931                         udf_file_entry_alloc_offset(inode) +
1932                         iinfo->i_lenEAttr;
1933         else
1934                 ptr = epos->bh->b_data + epos->offset;
1935 
1936         switch (iinfo->i_alloc_type) {
1937         case ICBTAG_FLAG_AD_SHORT:
1938                 sad = (struct short_ad *)ptr;
1939                 sad->extLength = cpu_to_le32(elen);
1940                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1941                 adsize = sizeof(struct short_ad);
1942                 break;
1943         case ICBTAG_FLAG_AD_LONG:
1944                 lad = (struct long_ad *)ptr;
1945                 lad->extLength = cpu_to_le32(elen);
1946                 lad->extLocation = cpu_to_lelb(*eloc);
1947                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1948                 adsize = sizeof(struct long_ad);
1949                 break;
1950         default:
1951                 return;
1952         }
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                         struct allocExtDesc *aed =
1958                                 (struct allocExtDesc *)epos->bh->b_data;
1959                         udf_update_tag(epos->bh->b_data,
1960                                        le32_to_cpu(aed->lengthAllocDescs) +
1961                                        sizeof(struct allocExtDesc));
1962                 }
1963                 mark_buffer_dirty_inode(epos->bh, inode);
1964         } else {
1965                 mark_inode_dirty(inode);
1966         }
1967 
1968         if (inc)
1969                 epos->offset += adsize;
1970 }
1971 
1972 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1973                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1974 {
1975         int8_t etype;
1976 
1977         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1978                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1979                 int block;
1980                 epos->block = *eloc;
1981                 epos->offset = sizeof(struct allocExtDesc);
1982                 brelse(epos->bh);
1983                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1984                 epos->bh = udf_tread(inode->i_sb, block);
1985                 if (!epos->bh) {
1986                         udf_debug("reading block %d failed!\n", block);
1987                         return -1;
1988                 }
1989         }
1990 
1991         return etype;
1992 }
1993 
1994 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1995                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1996 {
1997         int alen;
1998         int8_t etype;
1999         uint8_t *ptr;
2000         struct short_ad *sad;
2001         struct long_ad *lad;
2002         struct udf_inode_info *iinfo = UDF_I(inode);
2003 
2004         if (!epos->bh) {
2005                 if (!epos->offset)
2006                         epos->offset = udf_file_entry_alloc_offset(inode);
2007                 ptr = iinfo->i_ext.i_data + epos->offset -
2008                         udf_file_entry_alloc_offset(inode) +
2009                         iinfo->i_lenEAttr;
2010                 alen = udf_file_entry_alloc_offset(inode) +
2011                                                         iinfo->i_lenAlloc;
2012         } else {
2013                 if (!epos->offset)
2014                         epos->offset = sizeof(struct allocExtDesc);
2015                 ptr = epos->bh->b_data + epos->offset;
2016                 alen = sizeof(struct allocExtDesc) +
2017                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2018                                                         lengthAllocDescs);
2019         }
2020 
2021         switch (iinfo->i_alloc_type) {
2022         case ICBTAG_FLAG_AD_SHORT:
2023                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2024                 if (!sad)
2025                         return -1;
2026                 etype = le32_to_cpu(sad->extLength) >> 30;
2027                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2028                 eloc->partitionReferenceNum =
2029                                 iinfo->i_location.partitionReferenceNum;
2030                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2031                 break;
2032         case ICBTAG_FLAG_AD_LONG:
2033                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2034                 if (!lad)
2035                         return -1;
2036                 etype = le32_to_cpu(lad->extLength) >> 30;
2037                 *eloc = lelb_to_cpu(lad->extLocation);
2038                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2039                 break;
2040         default:
2041                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2042                 return -1;
2043         }
2044 
2045         return etype;
2046 }
2047 
2048 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2049                               struct kernel_lb_addr neloc, uint32_t nelen)
2050 {
2051         struct kernel_lb_addr oeloc;
2052         uint32_t oelen;
2053         int8_t etype;
2054 
2055         if (epos.bh)
2056                 get_bh(epos.bh);
2057 
2058         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2059                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2060                 neloc = oeloc;
2061                 nelen = (etype << 30) | oelen;
2062         }
2063         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2064         brelse(epos.bh);
2065 
2066         return (nelen >> 30);
2067 }
2068 
2069 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2070                        struct kernel_lb_addr eloc, uint32_t elen)
2071 {
2072         struct extent_position oepos;
2073         int adsize;
2074         int8_t etype;
2075         struct allocExtDesc *aed;
2076         struct udf_inode_info *iinfo;
2077 
2078         if (epos.bh) {
2079                 get_bh(epos.bh);
2080                 get_bh(epos.bh);
2081         }
2082 
2083         iinfo = UDF_I(inode);
2084         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2085                 adsize = sizeof(struct short_ad);
2086         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2087                 adsize = sizeof(struct long_ad);
2088         else
2089                 adsize = 0;
2090 
2091         oepos = epos;
2092         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2093                 return -1;
2094 
2095         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2096                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2097                 if (oepos.bh != epos.bh) {
2098                         oepos.block = epos.block;
2099                         brelse(oepos.bh);
2100                         get_bh(epos.bh);
2101                         oepos.bh = epos.bh;
2102                         oepos.offset = epos.offset - adsize;
2103                 }
2104         }
2105         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2106         elen = 0;
2107 
2108         if (epos.bh != oepos.bh) {
2109                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2110                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2111                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2112                 if (!oepos.bh) {
2113                         iinfo->i_lenAlloc -= (adsize * 2);
2114                         mark_inode_dirty(inode);
2115                 } else {
2116                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2117                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2118                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2119                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2120                                 udf_update_tag(oepos.bh->b_data,
2121                                                 oepos.offset - (2 * adsize));
2122                         else
2123                                 udf_update_tag(oepos.bh->b_data,
2124                                                 sizeof(struct allocExtDesc));
2125                         mark_buffer_dirty_inode(oepos.bh, inode);
2126                 }
2127         } else {
2128                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2129                 if (!oepos.bh) {
2130                         iinfo->i_lenAlloc -= adsize;
2131                         mark_inode_dirty(inode);
2132                 } else {
2133                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2134                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2135                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2136                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2137                                 udf_update_tag(oepos.bh->b_data,
2138                                                 epos.offset - adsize);
2139                         else
2140                                 udf_update_tag(oepos.bh->b_data,
2141                                                 sizeof(struct allocExtDesc));
2142                         mark_buffer_dirty_inode(oepos.bh, inode);
2143                 }
2144         }
2145 
2146         brelse(epos.bh);
2147         brelse(oepos.bh);
2148 
2149         return (elen >> 30);
2150 }
2151 
2152 int8_t inode_bmap(struct inode *inode, sector_t block,
2153                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2154                   uint32_t *elen, sector_t *offset)
2155 {
2156         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2157         loff_t lbcount = 0, bcount =
2158             (loff_t) block << blocksize_bits;
2159         int8_t etype;
2160         struct udf_inode_info *iinfo;
2161 
2162         iinfo = UDF_I(inode);
2163         pos->offset = 0;
2164         pos->block = iinfo->i_location;
2165         pos->bh = NULL;
2166         *elen = 0;
2167 
2168         do {
2169                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2170                 if (etype == -1) {
2171                         *offset = (bcount - lbcount) >> blocksize_bits;
2172                         iinfo->i_lenExtents = lbcount;
2173                         return -1;
2174                 }
2175                 lbcount += *elen;
2176         } while (lbcount <= bcount);
2177 
2178         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2179 
2180         return etype;
2181 }
2182 
2183 long udf_block_map(struct inode *inode, sector_t block)
2184 {
2185         struct kernel_lb_addr eloc;
2186         uint32_t elen;
2187         sector_t offset;
2188         struct extent_position epos = {};
2189         int ret;
2190 
2191         down_read(&UDF_I(inode)->i_data_sem);
2192 
2193         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2194                                                 (EXT_RECORDED_ALLOCATED >> 30))
2195                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2196         else
2197                 ret = 0;
2198 
2199         up_read(&UDF_I(inode)->i_data_sem);
2200         brelse(epos.bh);
2201 
2202         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2203                 return udf_fixed_to_variable(ret);
2204         else
2205                 return ret;
2206 }
2207 

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