Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
[linux-drm-fsl-dcu.git] / fs / udf / inode.c
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         clear_inode(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
578         *err = 0;
579         *new = 0;
580         prev_epos.offset = udf_file_entry_alloc_offset(inode);
581         prev_epos.block = iinfo->i_location;
582         prev_epos.bh = NULL;
583         cur_epos = next_epos = prev_epos;
584         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
585
586         /* find the extent which contains the block we are looking for.
587            alternate between laarr[0] and laarr[1] for locations of the
588            current extent, and the previous extent */
589         do {
590                 if (prev_epos.bh != cur_epos.bh) {
591                         brelse(prev_epos.bh);
592                         get_bh(cur_epos.bh);
593                         prev_epos.bh = cur_epos.bh;
594                 }
595                 if (cur_epos.bh != next_epos.bh) {
596                         brelse(cur_epos.bh);
597                         get_bh(next_epos.bh);
598                         cur_epos.bh = next_epos.bh;
599                 }
600
601                 lbcount += elen;
602
603                 prev_epos.block = cur_epos.block;
604                 cur_epos.block = next_epos.block;
605
606                 prev_epos.offset = cur_epos.offset;
607                 cur_epos.offset = next_epos.offset;
608
609                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
610                 if (etype == -1)
611                         break;
612
613                 c = !c;
614
615                 laarr[c].extLength = (etype << 30) | elen;
616                 laarr[c].extLocation = eloc;
617
618                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
619                         pgoal = eloc.logicalBlockNum +
620                                 ((elen + inode->i_sb->s_blocksize - 1) >>
621                                  inode->i_sb->s_blocksize_bits);
622
623                 count++;
624         } while (lbcount + elen <= b_off);
625
626         b_off -= lbcount;
627         offset = b_off >> inode->i_sb->s_blocksize_bits;
628         /*
629          * Move prev_epos and cur_epos into indirect extent if we are at
630          * the pointer to it
631          */
632         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
633         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
634
635         /* if the extent is allocated and recorded, return the block
636            if the extent is not a multiple of the blocksize, round up */
637
638         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
639                 if (elen & (inode->i_sb->s_blocksize - 1)) {
640                         elen = EXT_RECORDED_ALLOCATED |
641                                 ((elen + inode->i_sb->s_blocksize - 1) &
642                                  ~(inode->i_sb->s_blocksize - 1));
643                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
644                 }
645                 brelse(prev_epos.bh);
646                 brelse(cur_epos.bh);
647                 brelse(next_epos.bh);
648                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
649                 return newblock;
650         }
651
652         last_block = block;
653         /* Are we beyond EOF? */
654         if (etype == -1) {
655                 int ret;
656
657                 if (count) {
658                         if (c)
659                                 laarr[0] = laarr[1];
660                         startnum = 1;
661                 } else {
662                         /* Create a fake extent when there's not one */
663                         memset(&laarr[0].extLocation, 0x00,
664                                 sizeof(struct kernel_lb_addr));
665                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
666                         /* Will udf_do_extend_file() create real extent from
667                            a fake one? */
668                         startnum = (offset > 0);
669                 }
670                 /* Create extents for the hole between EOF and offset */
671                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
672                 if (ret < 0) {
673                         brelse(prev_epos.bh);
674                         brelse(cur_epos.bh);
675                         brelse(next_epos.bh);
676                         *err = ret;
677                         return 0;
678                 }
679                 c = 0;
680                 offset = 0;
681                 count += ret;
682                 /* We are not covered by a preallocated extent? */
683                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
684                                                 EXT_NOT_RECORDED_ALLOCATED) {
685                         /* Is there any real extent? - otherwise we overwrite
686                          * the fake one... */
687                         if (count)
688                                 c = !c;
689                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
690                                 inode->i_sb->s_blocksize;
691                         memset(&laarr[c].extLocation, 0x00,
692                                 sizeof(struct kernel_lb_addr));
693                         count++;
694                         endnum++;
695                 }
696                 endnum = c + 1;
697                 lastblock = 1;
698         } else {
699                 endnum = startnum = ((count > 2) ? 2 : count);
700
701                 /* if the current extent is in position 0,
702                    swap it with the previous */
703                 if (!c && count != 1) {
704                         laarr[2] = laarr[0];
705                         laarr[0] = laarr[1];
706                         laarr[1] = laarr[2];
707                         c = 1;
708                 }
709
710                 /* if the current block is located in an extent,
711                    read the next extent */
712                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
713                 if (etype != -1) {
714                         laarr[c + 1].extLength = (etype << 30) | elen;
715                         laarr[c + 1].extLocation = eloc;
716                         count++;
717                         startnum++;
718                         endnum++;
719                 } else
720                         lastblock = 1;
721         }
722
723         /* if the current extent is not recorded but allocated, get the
724          * block in the extent corresponding to the requested block */
725         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
726                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
727         else { /* otherwise, allocate a new block */
728                 if (iinfo->i_next_alloc_block == block)
729                         goal = iinfo->i_next_alloc_goal;
730
731                 if (!goal) {
732                         if (!(goal = pgoal)) /* XXX: what was intended here? */
733                                 goal = iinfo->i_location.logicalBlockNum + 1;
734                 }
735
736                 newblocknum = udf_new_block(inode->i_sb, inode,
737                                 iinfo->i_location.partitionReferenceNum,
738                                 goal, err);
739                 if (!newblocknum) {
740                         brelse(prev_epos.bh);
741                         *err = -ENOSPC;
742                         return 0;
743                 }
744                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
745         }
746
747         /* if the extent the requsted block is located in contains multiple
748          * blocks, split the extent into at most three extents. blocks prior
749          * to requested block, requested block, and blocks after requested
750          * block */
751         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
752
753 #ifdef UDF_PREALLOCATE
754         /* We preallocate blocks only for regular files. It also makes sense
755          * for directories but there's a problem when to drop the
756          * preallocation. We might use some delayed work for that but I feel
757          * it's overengineering for a filesystem like UDF. */
758         if (S_ISREG(inode->i_mode))
759                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
760 #endif
761
762         /* merge any continuous blocks in laarr */
763         udf_merge_extents(inode, laarr, &endnum);
764
765         /* write back the new extents, inserting new extents if the new number
766          * of extents is greater than the old number, and deleting extents if
767          * the new number of extents is less than the old number */
768         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
769
770         brelse(prev_epos.bh);
771
772         newblock = udf_get_pblock(inode->i_sb, newblocknum,
773                                 iinfo->i_location.partitionReferenceNum, 0);
774         if (!newblock) {
775                 *err = -EIO;
776                 return 0;
777         }
778         *new = 1;
779         iinfo->i_next_alloc_block = block;
780         iinfo->i_next_alloc_goal = newblocknum;
781         inode->i_ctime = current_fs_time(inode->i_sb);
782
783         if (IS_SYNC(inode))
784                 udf_sync_inode(inode);
785         else
786                 mark_inode_dirty(inode);
787
788         return newblock;
789 }
790
791 static void udf_split_extents(struct inode *inode, int *c, int offset,
792                               int newblocknum,
793                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
794                               int *endnum)
795 {
796         unsigned long blocksize = inode->i_sb->s_blocksize;
797         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
798
799         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
800             (laarr[*c].extLength >> 30) ==
801                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
802                 int curr = *c;
803                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
804                             blocksize - 1) >> blocksize_bits;
805                 int8_t etype = (laarr[curr].extLength >> 30);
806
807                 if (blen == 1)
808                         ;
809                 else if (!offset || blen == offset + 1) {
810                         laarr[curr + 2] = laarr[curr + 1];
811                         laarr[curr + 1] = laarr[curr];
812                 } else {
813                         laarr[curr + 3] = laarr[curr + 1];
814                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
815                 }
816
817                 if (offset) {
818                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
819                                 udf_free_blocks(inode->i_sb, inode,
820                                                 &laarr[curr].extLocation,
821                                                 0, offset);
822                                 laarr[curr].extLength =
823                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
824                                         (offset << blocksize_bits);
825                                 laarr[curr].extLocation.logicalBlockNum = 0;
826                                 laarr[curr].extLocation.
827                                                 partitionReferenceNum = 0;
828                         } else
829                                 laarr[curr].extLength = (etype << 30) |
830                                         (offset << blocksize_bits);
831                         curr++;
832                         (*c)++;
833                         (*endnum)++;
834                 }
835
836                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
837                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
838                         laarr[curr].extLocation.partitionReferenceNum =
839                                 UDF_I(inode)->i_location.partitionReferenceNum;
840                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
841                         blocksize;
842                 curr++;
843
844                 if (blen != offset + 1) {
845                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
846                                 laarr[curr].extLocation.logicalBlockNum +=
847                                                                 offset + 1;
848                         laarr[curr].extLength = (etype << 30) |
849                                 ((blen - (offset + 1)) << blocksize_bits);
850                         curr++;
851                         (*endnum)++;
852                 }
853         }
854 }
855
856 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
857                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
858                                  int *endnum)
859 {
860         int start, length = 0, currlength = 0, i;
861
862         if (*endnum >= (c + 1)) {
863                 if (!lastblock)
864                         return;
865                 else
866                         start = c;
867         } else {
868                 if ((laarr[c + 1].extLength >> 30) ==
869                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
870                         start = c + 1;
871                         length = currlength =
872                                 (((laarr[c + 1].extLength &
873                                         UDF_EXTENT_LENGTH_MASK) +
874                                 inode->i_sb->s_blocksize - 1) >>
875                                 inode->i_sb->s_blocksize_bits);
876                 } else
877                         start = c;
878         }
879
880         for (i = start + 1; i <= *endnum; i++) {
881                 if (i == *endnum) {
882                         if (lastblock)
883                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
884                 } else if ((laarr[i].extLength >> 30) ==
885                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
886                         length += (((laarr[i].extLength &
887                                                 UDF_EXTENT_LENGTH_MASK) +
888                                     inode->i_sb->s_blocksize - 1) >>
889                                     inode->i_sb->s_blocksize_bits);
890                 } else
891                         break;
892         }
893
894         if (length) {
895                 int next = laarr[start].extLocation.logicalBlockNum +
896                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
897                           inode->i_sb->s_blocksize - 1) >>
898                           inode->i_sb->s_blocksize_bits);
899                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
900                                 laarr[start].extLocation.partitionReferenceNum,
901                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
902                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
903                                 currlength);
904                 if (numalloc)   {
905                         if (start == (c + 1))
906                                 laarr[start].extLength +=
907                                         (numalloc <<
908                                          inode->i_sb->s_blocksize_bits);
909                         else {
910                                 memmove(&laarr[c + 2], &laarr[c + 1],
911                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
912                                 (*endnum)++;
913                                 laarr[c + 1].extLocation.logicalBlockNum = next;
914                                 laarr[c + 1].extLocation.partitionReferenceNum =
915                                         laarr[c].extLocation.
916                                                         partitionReferenceNum;
917                                 laarr[c + 1].extLength =
918                                         EXT_NOT_RECORDED_ALLOCATED |
919                                         (numalloc <<
920                                          inode->i_sb->s_blocksize_bits);
921                                 start = c + 1;
922                         }
923
924                         for (i = start + 1; numalloc && i < *endnum; i++) {
925                                 int elen = ((laarr[i].extLength &
926                                                 UDF_EXTENT_LENGTH_MASK) +
927                                             inode->i_sb->s_blocksize - 1) >>
928                                             inode->i_sb->s_blocksize_bits;
929
930                                 if (elen > numalloc) {
931                                         laarr[i].extLength -=
932                                                 (numalloc <<
933                                                  inode->i_sb->s_blocksize_bits);
934                                         numalloc = 0;
935                                 } else {
936                                         numalloc -= elen;
937                                         if (*endnum > (i + 1))
938                                                 memmove(&laarr[i],
939                                                         &laarr[i + 1],
940                                                         sizeof(struct long_ad) *
941                                                         (*endnum - (i + 1)));
942                                         i--;
943                                         (*endnum)--;
944                                 }
945                         }
946                         UDF_I(inode)->i_lenExtents +=
947                                 numalloc << inode->i_sb->s_blocksize_bits;
948                 }
949         }
950 }
951
952 static void udf_merge_extents(struct inode *inode,
953                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
954                               int *endnum)
955 {
956         int i;
957         unsigned long blocksize = inode->i_sb->s_blocksize;
958         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
959
960         for (i = 0; i < (*endnum - 1); i++) {
961                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
962                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
963
964                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
965                         (((li->extLength >> 30) ==
966                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
967                         ((lip1->extLocation.logicalBlockNum -
968                           li->extLocation.logicalBlockNum) ==
969                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
970                         blocksize - 1) >> blocksize_bits)))) {
971
972                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
973                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
974                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
975                                 lip1->extLength = (lip1->extLength -
976                                                   (li->extLength &
977                                                    UDF_EXTENT_LENGTH_MASK) +
978                                                    UDF_EXTENT_LENGTH_MASK) &
979                                                         ~(blocksize - 1);
980                                 li->extLength = (li->extLength &
981                                                  UDF_EXTENT_FLAG_MASK) +
982                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
983                                                 blocksize;
984                                 lip1->extLocation.logicalBlockNum =
985                                         li->extLocation.logicalBlockNum +
986                                         ((li->extLength &
987                                                 UDF_EXTENT_LENGTH_MASK) >>
988                                                 blocksize_bits);
989                         } else {
990                                 li->extLength = lip1->extLength +
991                                         (((li->extLength &
992                                                 UDF_EXTENT_LENGTH_MASK) +
993                                          blocksize - 1) & ~(blocksize - 1));
994                                 if (*endnum > (i + 2))
995                                         memmove(&laarr[i + 1], &laarr[i + 2],
996                                                 sizeof(struct long_ad) *
997                                                 (*endnum - (i + 2)));
998                                 i--;
999                                 (*endnum)--;
1000                         }
1001                 } else if (((li->extLength >> 30) ==
1002                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1003                            ((lip1->extLength >> 30) ==
1004                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1005                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1006                                         ((li->extLength &
1007                                           UDF_EXTENT_LENGTH_MASK) +
1008                                          blocksize - 1) >> blocksize_bits);
1009                         li->extLocation.logicalBlockNum = 0;
1010                         li->extLocation.partitionReferenceNum = 0;
1011
1012                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1013                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1014                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1015                                 lip1->extLength = (lip1->extLength -
1016                                                    (li->extLength &
1017                                                    UDF_EXTENT_LENGTH_MASK) +
1018                                                    UDF_EXTENT_LENGTH_MASK) &
1019                                                    ~(blocksize - 1);
1020                                 li->extLength = (li->extLength &
1021                                                  UDF_EXTENT_FLAG_MASK) +
1022                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1023                                                 blocksize;
1024                         } else {
1025                                 li->extLength = lip1->extLength +
1026                                         (((li->extLength &
1027                                                 UDF_EXTENT_LENGTH_MASK) +
1028                                           blocksize - 1) & ~(blocksize - 1));
1029                                 if (*endnum > (i + 2))
1030                                         memmove(&laarr[i + 1], &laarr[i + 2],
1031                                                 sizeof(struct long_ad) *
1032                                                 (*endnum - (i + 2)));
1033                                 i--;
1034                                 (*endnum)--;
1035                         }
1036                 } else if ((li->extLength >> 30) ==
1037                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1038                         udf_free_blocks(inode->i_sb, inode,
1039                                         &li->extLocation, 0,
1040                                         ((li->extLength &
1041                                                 UDF_EXTENT_LENGTH_MASK) +
1042                                          blocksize - 1) >> blocksize_bits);
1043                         li->extLocation.logicalBlockNum = 0;
1044                         li->extLocation.partitionReferenceNum = 0;
1045                         li->extLength = (li->extLength &
1046                                                 UDF_EXTENT_LENGTH_MASK) |
1047                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1048                 }
1049         }
1050 }
1051
1052 static void udf_update_extents(struct inode *inode,
1053                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1054                                int startnum, int endnum,
1055                                struct extent_position *epos)
1056 {
1057         int start = 0, i;
1058         struct kernel_lb_addr tmploc;
1059         uint32_t tmplen;
1060
1061         if (startnum > endnum) {
1062                 for (i = 0; i < (startnum - endnum); i++)
1063                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1064                                         laarr[i].extLength);
1065         } else if (startnum < endnum) {
1066                 for (i = 0; i < (endnum - startnum); i++) {
1067                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1068                                         laarr[i].extLength);
1069                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1070                                       &laarr[i].extLength, 1);
1071                         start++;
1072                 }
1073         }
1074
1075         for (i = start; i < endnum; i++) {
1076                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1077                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1078                                laarr[i].extLength, 1);
1079         }
1080 }
1081
1082 struct buffer_head *udf_bread(struct inode *inode, int block,
1083                               int create, int *err)
1084 {
1085         struct buffer_head *bh = NULL;
1086
1087         bh = udf_getblk(inode, block, create, err);
1088         if (!bh)
1089                 return NULL;
1090
1091         if (buffer_uptodate(bh))
1092                 return bh;
1093
1094         ll_rw_block(READ, 1, &bh);
1095
1096         wait_on_buffer(bh);
1097         if (buffer_uptodate(bh))
1098                 return bh;
1099
1100         brelse(bh);
1101         *err = -EIO;
1102         return NULL;
1103 }
1104
1105 int udf_setsize(struct inode *inode, loff_t newsize)
1106 {
1107         int err;
1108         struct udf_inode_info *iinfo;
1109         int bsize = 1 << inode->i_blkbits;
1110
1111         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1112               S_ISLNK(inode->i_mode)))
1113                 return -EINVAL;
1114         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1115                 return -EPERM;
1116
1117         iinfo = UDF_I(inode);
1118         if (newsize > inode->i_size) {
1119                 down_write(&iinfo->i_data_sem);
1120                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1121                         if (bsize <
1122                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1123                                 err = udf_expand_file_adinicb(inode);
1124                                 if (err)
1125                                         return err;
1126                                 down_write(&iinfo->i_data_sem);
1127                         } else
1128                                 iinfo->i_lenAlloc = newsize;
1129                 }
1130                 err = udf_extend_file(inode, newsize);
1131                 if (err) {
1132                         up_write(&iinfo->i_data_sem);
1133                         return err;
1134                 }
1135                 truncate_setsize(inode, newsize);
1136                 up_write(&iinfo->i_data_sem);
1137         } else {
1138                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1139                         down_write(&iinfo->i_data_sem);
1140                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1141                                0x00, bsize - newsize -
1142                                udf_file_entry_alloc_offset(inode));
1143                         iinfo->i_lenAlloc = newsize;
1144                         truncate_setsize(inode, newsize);
1145                         up_write(&iinfo->i_data_sem);
1146                         goto update_time;
1147                 }
1148                 err = block_truncate_page(inode->i_mapping, newsize,
1149                                           udf_get_block);
1150                 if (err)
1151                         return err;
1152                 down_write(&iinfo->i_data_sem);
1153                 truncate_setsize(inode, newsize);
1154                 udf_truncate_extents(inode);
1155                 up_write(&iinfo->i_data_sem);
1156         }
1157 update_time:
1158         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1159         if (IS_SYNC(inode))
1160                 udf_sync_inode(inode);
1161         else
1162                 mark_inode_dirty(inode);
1163         return 0;
1164 }
1165
1166 static void __udf_read_inode(struct inode *inode)
1167 {
1168         struct buffer_head *bh = NULL;
1169         struct fileEntry *fe;
1170         uint16_t ident;
1171         struct udf_inode_info *iinfo = UDF_I(inode);
1172
1173         /*
1174          * Set defaults, but the inode is still incomplete!
1175          * Note: get_new_inode() sets the following on a new inode:
1176          *      i_sb = sb
1177          *      i_no = ino
1178          *      i_flags = sb->s_flags
1179          *      i_state = 0
1180          * clean_inode(): zero fills and sets
1181          *      i_count = 1
1182          *      i_nlink = 1
1183          *      i_op = NULL;
1184          */
1185         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1186         if (!bh) {
1187                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1188                 make_bad_inode(inode);
1189                 return;
1190         }
1191
1192         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1193             ident != TAG_IDENT_USE) {
1194                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1195                         inode->i_ino, ident);
1196                 brelse(bh);
1197                 make_bad_inode(inode);
1198                 return;
1199         }
1200
1201         fe = (struct fileEntry *)bh->b_data;
1202
1203         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1204                 struct buffer_head *ibh;
1205
1206                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1207                                         &ident);
1208                 if (ident == TAG_IDENT_IE && ibh) {
1209                         struct buffer_head *nbh = NULL;
1210                         struct kernel_lb_addr loc;
1211                         struct indirectEntry *ie;
1212
1213                         ie = (struct indirectEntry *)ibh->b_data;
1214                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1215
1216                         if (ie->indirectICB.extLength &&
1217                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1218                                                         &ident))) {
1219                                 if (ident == TAG_IDENT_FE ||
1220                                         ident == TAG_IDENT_EFE) {
1221                                         memcpy(&iinfo->i_location,
1222                                                 &loc,
1223                                                 sizeof(struct kernel_lb_addr));
1224                                         brelse(bh);
1225                                         brelse(ibh);
1226                                         brelse(nbh);
1227                                         __udf_read_inode(inode);
1228                                         return;
1229                                 }
1230                                 brelse(nbh);
1231                         }
1232                 }
1233                 brelse(ibh);
1234         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1235                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1236                         le16_to_cpu(fe->icbTag.strategyType));
1237                 brelse(bh);
1238                 make_bad_inode(inode);
1239                 return;
1240         }
1241         udf_fill_inode(inode, bh);
1242
1243         brelse(bh);
1244 }
1245
1246 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1247 {
1248         struct fileEntry *fe;
1249         struct extendedFileEntry *efe;
1250         int offset;
1251         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1252         struct udf_inode_info *iinfo = UDF_I(inode);
1253         unsigned int link_count;
1254
1255         fe = (struct fileEntry *)bh->b_data;
1256         efe = (struct extendedFileEntry *)bh->b_data;
1257
1258         if (fe->icbTag.strategyType == cpu_to_le16(4))
1259                 iinfo->i_strat4096 = 0;
1260         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1261                 iinfo->i_strat4096 = 1;
1262
1263         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1264                                                         ICBTAG_FLAG_AD_MASK;
1265         iinfo->i_unique = 0;
1266         iinfo->i_lenEAttr = 0;
1267         iinfo->i_lenExtents = 0;
1268         iinfo->i_lenAlloc = 0;
1269         iinfo->i_next_alloc_block = 0;
1270         iinfo->i_next_alloc_goal = 0;
1271         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1272                 iinfo->i_efe = 1;
1273                 iinfo->i_use = 0;
1274                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1275                                         sizeof(struct extendedFileEntry))) {
1276                         make_bad_inode(inode);
1277                         return;
1278                 }
1279                 memcpy(iinfo->i_ext.i_data,
1280                        bh->b_data + sizeof(struct extendedFileEntry),
1281                        inode->i_sb->s_blocksize -
1282                                         sizeof(struct extendedFileEntry));
1283         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1284                 iinfo->i_efe = 0;
1285                 iinfo->i_use = 0;
1286                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1287                                                 sizeof(struct fileEntry))) {
1288                         make_bad_inode(inode);
1289                         return;
1290                 }
1291                 memcpy(iinfo->i_ext.i_data,
1292                        bh->b_data + sizeof(struct fileEntry),
1293                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1294         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1295                 iinfo->i_efe = 0;
1296                 iinfo->i_use = 1;
1297                 iinfo->i_lenAlloc = le32_to_cpu(
1298                                 ((struct unallocSpaceEntry *)bh->b_data)->
1299                                  lengthAllocDescs);
1300                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1301                                         sizeof(struct unallocSpaceEntry))) {
1302                         make_bad_inode(inode);
1303                         return;
1304                 }
1305                 memcpy(iinfo->i_ext.i_data,
1306                        bh->b_data + sizeof(struct unallocSpaceEntry),
1307                        inode->i_sb->s_blocksize -
1308                                         sizeof(struct unallocSpaceEntry));
1309                 return;
1310         }
1311
1312         read_lock(&sbi->s_cred_lock);
1313         inode->i_uid = le32_to_cpu(fe->uid);
1314         if (inode->i_uid == -1 ||
1315             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1316             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1317                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1318
1319         inode->i_gid = le32_to_cpu(fe->gid);
1320         if (inode->i_gid == -1 ||
1321             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1322             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1323                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1324
1325         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1326                         sbi->s_fmode != UDF_INVALID_MODE)
1327                 inode->i_mode = sbi->s_fmode;
1328         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1329                         sbi->s_dmode != UDF_INVALID_MODE)
1330                 inode->i_mode = sbi->s_dmode;
1331         else
1332                 inode->i_mode = udf_convert_permissions(fe);
1333         inode->i_mode &= ~sbi->s_umask;
1334         read_unlock(&sbi->s_cred_lock);
1335
1336         link_count = le16_to_cpu(fe->fileLinkCount);
1337         if (!link_count)
1338                 link_count = 1;
1339         set_nlink(inode, link_count);
1340
1341         inode->i_size = le64_to_cpu(fe->informationLength);
1342         iinfo->i_lenExtents = inode->i_size;
1343
1344         if (iinfo->i_efe == 0) {
1345                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1346                         (inode->i_sb->s_blocksize_bits - 9);
1347
1348                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1349                         inode->i_atime = sbi->s_record_time;
1350
1351                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1352                                             fe->modificationTime))
1353                         inode->i_mtime = sbi->s_record_time;
1354
1355                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1356                         inode->i_ctime = sbi->s_record_time;
1357
1358                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1359                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1360                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1361                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1362                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1363         } else {
1364                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1365                     (inode->i_sb->s_blocksize_bits - 9);
1366
1367                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1368                         inode->i_atime = sbi->s_record_time;
1369
1370                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1371                                             efe->modificationTime))
1372                         inode->i_mtime = sbi->s_record_time;
1373
1374                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1375                         iinfo->i_crtime = sbi->s_record_time;
1376
1377                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1378                         inode->i_ctime = sbi->s_record_time;
1379
1380                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1381                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1382                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1383                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1384                 offset = sizeof(struct extendedFileEntry) +
1385                                                         iinfo->i_lenEAttr;
1386         }
1387
1388         switch (fe->icbTag.fileType) {
1389         case ICBTAG_FILE_TYPE_DIRECTORY:
1390                 inode->i_op = &udf_dir_inode_operations;
1391                 inode->i_fop = &udf_dir_operations;
1392                 inode->i_mode |= S_IFDIR;
1393                 inc_nlink(inode);
1394                 break;
1395         case ICBTAG_FILE_TYPE_REALTIME:
1396         case ICBTAG_FILE_TYPE_REGULAR:
1397         case ICBTAG_FILE_TYPE_UNDEF:
1398         case ICBTAG_FILE_TYPE_VAT20:
1399                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1400                         inode->i_data.a_ops = &udf_adinicb_aops;
1401                 else
1402                         inode->i_data.a_ops = &udf_aops;
1403                 inode->i_op = &udf_file_inode_operations;
1404                 inode->i_fop = &udf_file_operations;
1405                 inode->i_mode |= S_IFREG;
1406                 break;
1407         case ICBTAG_FILE_TYPE_BLOCK:
1408                 inode->i_mode |= S_IFBLK;
1409                 break;
1410         case ICBTAG_FILE_TYPE_CHAR:
1411                 inode->i_mode |= S_IFCHR;
1412                 break;
1413         case ICBTAG_FILE_TYPE_FIFO:
1414                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1415                 break;
1416         case ICBTAG_FILE_TYPE_SOCKET:
1417                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1418                 break;
1419         case ICBTAG_FILE_TYPE_SYMLINK:
1420                 inode->i_data.a_ops = &udf_symlink_aops;
1421                 inode->i_op = &udf_symlink_inode_operations;
1422                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1423                 break;
1424         case ICBTAG_FILE_TYPE_MAIN:
1425                 udf_debug("METADATA FILE-----\n");
1426                 break;
1427         case ICBTAG_FILE_TYPE_MIRROR:
1428                 udf_debug("METADATA MIRROR FILE-----\n");
1429                 break;
1430         case ICBTAG_FILE_TYPE_BITMAP:
1431                 udf_debug("METADATA BITMAP FILE-----\n");
1432                 break;
1433         default:
1434                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1435                         inode->i_ino, fe->icbTag.fileType);
1436                 make_bad_inode(inode);
1437                 return;
1438         }
1439         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1440                 struct deviceSpec *dsea =
1441                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1442                 if (dsea) {
1443                         init_special_inode(inode, inode->i_mode,
1444                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1445                                       le32_to_cpu(dsea->minorDeviceIdent)));
1446                         /* Developer ID ??? */
1447                 } else
1448                         make_bad_inode(inode);
1449         }
1450 }
1451
1452 static int udf_alloc_i_data(struct inode *inode, size_t size)
1453 {
1454         struct udf_inode_info *iinfo = UDF_I(inode);
1455         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1456
1457         if (!iinfo->i_ext.i_data) {
1458                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1459                         inode->i_ino);
1460                 return -ENOMEM;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static umode_t udf_convert_permissions(struct fileEntry *fe)
1467 {
1468         umode_t mode;
1469         uint32_t permissions;
1470         uint32_t flags;
1471
1472         permissions = le32_to_cpu(fe->permissions);
1473         flags = le16_to_cpu(fe->icbTag.flags);
1474
1475         mode =  ((permissions) & S_IRWXO) |
1476                 ((permissions >> 2) & S_IRWXG) |
1477                 ((permissions >> 4) & S_IRWXU) |
1478                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1479                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1480                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1481
1482         return mode;
1483 }
1484
1485 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1486 {
1487         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1488 }
1489
1490 static int udf_sync_inode(struct inode *inode)
1491 {
1492         return udf_update_inode(inode, 1);
1493 }
1494
1495 static int udf_update_inode(struct inode *inode, int do_sync)
1496 {
1497         struct buffer_head *bh = NULL;
1498         struct fileEntry *fe;
1499         struct extendedFileEntry *efe;
1500         uint64_t lb_recorded;
1501         uint32_t udfperms;
1502         uint16_t icbflags;
1503         uint16_t crclen;
1504         int err = 0;
1505         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1506         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1507         struct udf_inode_info *iinfo = UDF_I(inode);
1508
1509         bh = udf_tgetblk(inode->i_sb,
1510                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1511         if (!bh) {
1512                 udf_debug("getblk failure\n");
1513                 return -ENOMEM;
1514         }
1515
1516         lock_buffer(bh);
1517         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1518         fe = (struct fileEntry *)bh->b_data;
1519         efe = (struct extendedFileEntry *)bh->b_data;
1520
1521         if (iinfo->i_use) {
1522                 struct unallocSpaceEntry *use =
1523                         (struct unallocSpaceEntry *)bh->b_data;
1524
1525                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1526                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1527                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1528                                         sizeof(struct unallocSpaceEntry));
1529                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1530                 use->descTag.tagLocation =
1531                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1532                 crclen = sizeof(struct unallocSpaceEntry) +
1533                                 iinfo->i_lenAlloc - sizeof(struct tag);
1534                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1535                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1536                                                            sizeof(struct tag),
1537                                                            crclen));
1538                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1539
1540                 goto out;
1541         }
1542
1543         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1544                 fe->uid = cpu_to_le32(-1);
1545         else
1546                 fe->uid = cpu_to_le32(inode->i_uid);
1547
1548         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1549                 fe->gid = cpu_to_le32(-1);
1550         else
1551                 fe->gid = cpu_to_le32(inode->i_gid);
1552
1553         udfperms = ((inode->i_mode & S_IRWXO)) |
1554                    ((inode->i_mode & S_IRWXG) << 2) |
1555                    ((inode->i_mode & S_IRWXU) << 4);
1556
1557         udfperms |= (le32_to_cpu(fe->permissions) &
1558                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1559                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1560                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1561         fe->permissions = cpu_to_le32(udfperms);
1562
1563         if (S_ISDIR(inode->i_mode))
1564                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1565         else
1566                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1567
1568         fe->informationLength = cpu_to_le64(inode->i_size);
1569
1570         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1571                 struct regid *eid;
1572                 struct deviceSpec *dsea =
1573                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1574                 if (!dsea) {
1575                         dsea = (struct deviceSpec *)
1576                                 udf_add_extendedattr(inode,
1577                                                      sizeof(struct deviceSpec) +
1578                                                      sizeof(struct regid), 12, 0x3);
1579                         dsea->attrType = cpu_to_le32(12);
1580                         dsea->attrSubtype = 1;
1581                         dsea->attrLength = cpu_to_le32(
1582                                                 sizeof(struct deviceSpec) +
1583                                                 sizeof(struct regid));
1584                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1585                 }
1586                 eid = (struct regid *)dsea->impUse;
1587                 memset(eid, 0, sizeof(struct regid));
1588                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1589                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1590                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1591                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1592                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1593         }
1594
1595         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1596                 lb_recorded = 0; /* No extents => no blocks! */
1597         else
1598                 lb_recorded =
1599                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1600                         (blocksize_bits - 9);
1601
1602         if (iinfo->i_efe == 0) {
1603                 memcpy(bh->b_data + sizeof(struct fileEntry),
1604                        iinfo->i_ext.i_data,
1605                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1606                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1607
1608                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1609                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1610                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1611                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1612                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1613                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1614                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1615                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1616                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1617                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1618                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1619                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1620                 crclen = sizeof(struct fileEntry);
1621         } else {
1622                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1623                        iinfo->i_ext.i_data,
1624                        inode->i_sb->s_blocksize -
1625                                         sizeof(struct extendedFileEntry));
1626                 efe->objectSize = cpu_to_le64(inode->i_size);
1627                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1628
1629                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1630                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1631                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1632                         iinfo->i_crtime = inode->i_atime;
1633
1634                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1635                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1636                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1637                         iinfo->i_crtime = inode->i_mtime;
1638
1639                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1640                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1641                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1642                         iinfo->i_crtime = inode->i_ctime;
1643
1644                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1645                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1646                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1647                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1648
1649                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1650                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1651                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1652                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1653                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1654                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1655                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1656                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1657                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1658                 crclen = sizeof(struct extendedFileEntry);
1659         }
1660         if (iinfo->i_strat4096) {
1661                 fe->icbTag.strategyType = cpu_to_le16(4096);
1662                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1663                 fe->icbTag.numEntries = cpu_to_le16(2);
1664         } else {
1665                 fe->icbTag.strategyType = cpu_to_le16(4);
1666                 fe->icbTag.numEntries = cpu_to_le16(1);
1667         }
1668
1669         if (S_ISDIR(inode->i_mode))
1670                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1671         else if (S_ISREG(inode->i_mode))
1672                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1673         else if (S_ISLNK(inode->i_mode))
1674                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1675         else if (S_ISBLK(inode->i_mode))
1676                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1677         else if (S_ISCHR(inode->i_mode))
1678                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1679         else if (S_ISFIFO(inode->i_mode))
1680                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1681         else if (S_ISSOCK(inode->i_mode))
1682                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1683
1684         icbflags =      iinfo->i_alloc_type |
1685                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1686                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1687                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1688                         (le16_to_cpu(fe->icbTag.flags) &
1689                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1690                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1691
1692         fe->icbTag.flags = cpu_to_le16(icbflags);
1693         if (sbi->s_udfrev >= 0x0200)
1694                 fe->descTag.descVersion = cpu_to_le16(3);
1695         else
1696                 fe->descTag.descVersion = cpu_to_le16(2);
1697         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1698         fe->descTag.tagLocation = cpu_to_le32(
1699                                         iinfo->i_location.logicalBlockNum);
1700         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1701         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1702         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1703                                                   crclen));
1704         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1705
1706 out:
1707         set_buffer_uptodate(bh);
1708         unlock_buffer(bh);
1709
1710         /* write the data blocks */
1711         mark_buffer_dirty(bh);
1712         if (do_sync) {
1713                 sync_dirty_buffer(bh);
1714                 if (buffer_write_io_error(bh)) {
1715                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1716                                  inode->i_ino);
1717                         err = -EIO;
1718                 }
1719         }
1720         brelse(bh);
1721
1722         return err;
1723 }
1724
1725 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1726 {
1727         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1728         struct inode *inode = iget_locked(sb, block);
1729
1730         if (!inode)
1731                 return NULL;
1732
1733         if (inode->i_state & I_NEW) {
1734                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1735                 __udf_read_inode(inode);
1736                 unlock_new_inode(inode);
1737         }
1738
1739         if (is_bad_inode(inode))
1740                 goto out_iput;
1741
1742         if (ino->logicalBlockNum >= UDF_SB(sb)->
1743                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1744                 udf_debug("block=%d, partition=%d out of range\n",
1745                           ino->logicalBlockNum, ino->partitionReferenceNum);
1746                 make_bad_inode(inode);
1747                 goto out_iput;
1748         }
1749
1750         return inode;
1751
1752  out_iput:
1753         iput(inode);
1754         return NULL;
1755 }
1756
1757 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1758                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1759 {
1760         int adsize;
1761         struct short_ad *sad = NULL;
1762         struct long_ad *lad = NULL;
1763         struct allocExtDesc *aed;
1764         uint8_t *ptr;
1765         struct udf_inode_info *iinfo = UDF_I(inode);
1766
1767         if (!epos->bh)
1768                 ptr = iinfo->i_ext.i_data + epos->offset -
1769                         udf_file_entry_alloc_offset(inode) +
1770                         iinfo->i_lenEAttr;
1771         else
1772                 ptr = epos->bh->b_data + epos->offset;
1773
1774         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1775                 adsize = sizeof(struct short_ad);
1776         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1777                 adsize = sizeof(struct long_ad);
1778         else
1779                 return -EIO;
1780
1781         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1782                 unsigned char *sptr, *dptr;
1783                 struct buffer_head *nbh;
1784                 int err, loffset;
1785                 struct kernel_lb_addr obloc = epos->block;
1786
1787                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1788                                                 obloc.partitionReferenceNum,
1789                                                 obloc.logicalBlockNum, &err);
1790                 if (!epos->block.logicalBlockNum)
1791                         return -ENOSPC;
1792                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1793                                                                  &epos->block,
1794                                                                  0));
1795                 if (!nbh)
1796                         return -EIO;
1797                 lock_buffer(nbh);
1798                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1799                 set_buffer_uptodate(nbh);
1800                 unlock_buffer(nbh);
1801                 mark_buffer_dirty_inode(nbh, inode);
1802
1803                 aed = (struct allocExtDesc *)(nbh->b_data);
1804                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1805                         aed->previousAllocExtLocation =
1806                                         cpu_to_le32(obloc.logicalBlockNum);
1807                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1808                         loffset = epos->offset;
1809                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1810                         sptr = ptr - adsize;
1811                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1812                         memcpy(dptr, sptr, adsize);
1813                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1814                 } else {
1815                         loffset = epos->offset + adsize;
1816                         aed->lengthAllocDescs = cpu_to_le32(0);
1817                         sptr = ptr;
1818                         epos->offset = sizeof(struct allocExtDesc);
1819
1820                         if (epos->bh) {
1821                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1822                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1823                         } else {
1824                                 iinfo->i_lenAlloc += adsize;
1825                                 mark_inode_dirty(inode);
1826                         }
1827                 }
1828                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1829                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1830                                     epos->block.logicalBlockNum, sizeof(struct tag));
1831                 else
1832                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1833                                     epos->block.logicalBlockNum, sizeof(struct tag));
1834                 switch (iinfo->i_alloc_type) {
1835                 case ICBTAG_FLAG_AD_SHORT:
1836                         sad = (struct short_ad *)sptr;
1837                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1838                                                      inode->i_sb->s_blocksize);
1839                         sad->extPosition =
1840                                 cpu_to_le32(epos->block.logicalBlockNum);
1841                         break;
1842                 case ICBTAG_FLAG_AD_LONG:
1843                         lad = (struct long_ad *)sptr;
1844                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1845                                                      inode->i_sb->s_blocksize);
1846                         lad->extLocation = cpu_to_lelb(epos->block);
1847                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1848                         break;
1849                 }
1850                 if (epos->bh) {
1851                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1852                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1853                                 udf_update_tag(epos->bh->b_data, loffset);
1854                         else
1855                                 udf_update_tag(epos->bh->b_data,
1856                                                 sizeof(struct allocExtDesc));
1857                         mark_buffer_dirty_inode(epos->bh, inode);
1858                         brelse(epos->bh);
1859                 } else {
1860                         mark_inode_dirty(inode);
1861                 }
1862                 epos->bh = nbh;
1863         }
1864
1865         udf_write_aext(inode, epos, eloc, elen, inc);
1866
1867         if (!epos->bh) {
1868                 iinfo->i_lenAlloc += adsize;
1869                 mark_inode_dirty(inode);
1870         } else {
1871                 aed = (struct allocExtDesc *)epos->bh->b_data;
1872                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1873                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1874                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1875                         udf_update_tag(epos->bh->b_data,
1876                                         epos->offset + (inc ? 0 : adsize));
1877                 else
1878                         udf_update_tag(epos->bh->b_data,
1879                                         sizeof(struct allocExtDesc));
1880                 mark_buffer_dirty_inode(epos->bh, inode);
1881         }
1882
1883         return 0;
1884 }
1885
1886 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1887                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1888 {
1889         int adsize;
1890         uint8_t *ptr;
1891         struct short_ad *sad;
1892         struct long_ad *lad;
1893         struct udf_inode_info *iinfo = UDF_I(inode);
1894
1895         if (!epos->bh)
1896                 ptr = iinfo->i_ext.i_data + epos->offset -
1897                         udf_file_entry_alloc_offset(inode) +
1898                         iinfo->i_lenEAttr;
1899         else
1900                 ptr = epos->bh->b_data + epos->offset;
1901
1902         switch (iinfo->i_alloc_type) {
1903         case ICBTAG_FLAG_AD_SHORT:
1904                 sad = (struct short_ad *)ptr;
1905                 sad->extLength = cpu_to_le32(elen);
1906                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1907                 adsize = sizeof(struct short_ad);
1908                 break;
1909         case ICBTAG_FLAG_AD_LONG:
1910                 lad = (struct long_ad *)ptr;
1911                 lad->extLength = cpu_to_le32(elen);
1912                 lad->extLocation = cpu_to_lelb(*eloc);
1913                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1914                 adsize = sizeof(struct long_ad);
1915                 break;
1916         default:
1917                 return;
1918         }
1919
1920         if (epos->bh) {
1921                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1922                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1923                         struct allocExtDesc *aed =
1924                                 (struct allocExtDesc *)epos->bh->b_data;
1925                         udf_update_tag(epos->bh->b_data,
1926                                        le32_to_cpu(aed->lengthAllocDescs) +
1927                                        sizeof(struct allocExtDesc));
1928                 }
1929                 mark_buffer_dirty_inode(epos->bh, inode);
1930         } else {
1931                 mark_inode_dirty(inode);
1932         }
1933
1934         if (inc)
1935                 epos->offset += adsize;
1936 }
1937
1938 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1939                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1940 {
1941         int8_t etype;
1942
1943         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1944                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1945                 int block;
1946                 epos->block = *eloc;
1947                 epos->offset = sizeof(struct allocExtDesc);
1948                 brelse(epos->bh);
1949                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1950                 epos->bh = udf_tread(inode->i_sb, block);
1951                 if (!epos->bh) {
1952                         udf_debug("reading block %d failed!\n", block);
1953                         return -1;
1954                 }
1955         }
1956
1957         return etype;
1958 }
1959
1960 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1961                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1962 {
1963         int alen;
1964         int8_t etype;
1965         uint8_t *ptr;
1966         struct short_ad *sad;
1967         struct long_ad *lad;
1968         struct udf_inode_info *iinfo = UDF_I(inode);
1969
1970         if (!epos->bh) {
1971                 if (!epos->offset)
1972                         epos->offset = udf_file_entry_alloc_offset(inode);
1973                 ptr = iinfo->i_ext.i_data + epos->offset -
1974                         udf_file_entry_alloc_offset(inode) +
1975                         iinfo->i_lenEAttr;
1976                 alen = udf_file_entry_alloc_offset(inode) +
1977                                                         iinfo->i_lenAlloc;
1978         } else {
1979                 if (!epos->offset)
1980                         epos->offset = sizeof(struct allocExtDesc);
1981                 ptr = epos->bh->b_data + epos->offset;
1982                 alen = sizeof(struct allocExtDesc) +
1983                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1984                                                         lengthAllocDescs);
1985         }
1986
1987         switch (iinfo->i_alloc_type) {
1988         case ICBTAG_FLAG_AD_SHORT:
1989                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1990                 if (!sad)
1991                         return -1;
1992                 etype = le32_to_cpu(sad->extLength) >> 30;
1993                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1994                 eloc->partitionReferenceNum =
1995                                 iinfo->i_location.partitionReferenceNum;
1996                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1997                 break;
1998         case ICBTAG_FLAG_AD_LONG:
1999                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2000                 if (!lad)
2001                         return -1;
2002                 etype = le32_to_cpu(lad->extLength) >> 30;
2003                 *eloc = lelb_to_cpu(lad->extLocation);
2004                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2005                 break;
2006         default:
2007                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2008                 return -1;
2009         }
2010
2011         return etype;
2012 }
2013
2014 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2015                               struct kernel_lb_addr neloc, uint32_t nelen)
2016 {
2017         struct kernel_lb_addr oeloc;
2018         uint32_t oelen;
2019         int8_t etype;
2020
2021         if (epos.bh)
2022                 get_bh(epos.bh);
2023
2024         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2025                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2026                 neloc = oeloc;
2027                 nelen = (etype << 30) | oelen;
2028         }
2029         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2030         brelse(epos.bh);
2031
2032         return (nelen >> 30);
2033 }
2034
2035 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2036                        struct kernel_lb_addr eloc, uint32_t elen)
2037 {
2038         struct extent_position oepos;
2039         int adsize;
2040         int8_t etype;
2041         struct allocExtDesc *aed;
2042         struct udf_inode_info *iinfo;
2043
2044         if (epos.bh) {
2045                 get_bh(epos.bh);
2046                 get_bh(epos.bh);
2047         }
2048
2049         iinfo = UDF_I(inode);
2050         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2051                 adsize = sizeof(struct short_ad);
2052         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2053                 adsize = sizeof(struct long_ad);
2054         else
2055                 adsize = 0;
2056
2057         oepos = epos;
2058         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2059                 return -1;
2060
2061         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2062                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2063                 if (oepos.bh != epos.bh) {
2064                         oepos.block = epos.block;
2065                         brelse(oepos.bh);
2066                         get_bh(epos.bh);
2067                         oepos.bh = epos.bh;
2068                         oepos.offset = epos.offset - adsize;
2069                 }
2070         }
2071         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2072         elen = 0;
2073
2074         if (epos.bh != oepos.bh) {
2075                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2076                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2077                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2078                 if (!oepos.bh) {
2079                         iinfo->i_lenAlloc -= (adsize * 2);
2080                         mark_inode_dirty(inode);
2081                 } else {
2082                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2083                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2084                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2085                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2086                                 udf_update_tag(oepos.bh->b_data,
2087                                                 oepos.offset - (2 * adsize));
2088                         else
2089                                 udf_update_tag(oepos.bh->b_data,
2090                                                 sizeof(struct allocExtDesc));
2091                         mark_buffer_dirty_inode(oepos.bh, inode);
2092                 }
2093         } else {
2094                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2095                 if (!oepos.bh) {
2096                         iinfo->i_lenAlloc -= adsize;
2097                         mark_inode_dirty(inode);
2098                 } else {
2099                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2100                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2101                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2102                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2103                                 udf_update_tag(oepos.bh->b_data,
2104                                                 epos.offset - adsize);
2105                         else
2106                                 udf_update_tag(oepos.bh->b_data,
2107                                                 sizeof(struct allocExtDesc));
2108                         mark_buffer_dirty_inode(oepos.bh, inode);
2109                 }
2110         }
2111
2112         brelse(epos.bh);
2113         brelse(oepos.bh);
2114
2115         return (elen >> 30);
2116 }
2117
2118 int8_t inode_bmap(struct inode *inode, sector_t block,
2119                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2120                   uint32_t *elen, sector_t *offset)
2121 {
2122         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2123         loff_t lbcount = 0, bcount =
2124             (loff_t) block << blocksize_bits;
2125         int8_t etype;
2126         struct udf_inode_info *iinfo;
2127
2128         iinfo = UDF_I(inode);
2129         pos->offset = 0;
2130         pos->block = iinfo->i_location;
2131         pos->bh = NULL;
2132         *elen = 0;
2133
2134         do {
2135                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2136                 if (etype == -1) {
2137                         *offset = (bcount - lbcount) >> blocksize_bits;
2138                         iinfo->i_lenExtents = lbcount;
2139                         return -1;
2140                 }
2141                 lbcount += *elen;
2142         } while (lbcount <= bcount);
2143
2144         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2145
2146         return etype;
2147 }
2148
2149 long udf_block_map(struct inode *inode, sector_t block)
2150 {
2151         struct kernel_lb_addr eloc;
2152         uint32_t elen;
2153         sector_t offset;
2154         struct extent_position epos = {};
2155         int ret;
2156
2157         down_read(&UDF_I(inode)->i_data_sem);
2158
2159         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2160                                                 (EXT_RECORDED_ALLOCATED >> 30))
2161                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2162         else
2163                 ret = 0;
2164
2165         up_read(&UDF_I(inode)->i_data_sem);
2166         brelse(epos.bh);
2167
2168         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2169                 return udf_fixed_to_variable(ret);
2170         else
2171                 return ret;
2172 }