new helper: ihold()
[linux-2.6.git] / fs / udf / namei.c
1 /*
2  * namei.c
3  *
4  * PURPOSE
5  *      Inode name 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) 1998-2004 Ben Fennema
14  *  (C) 1999-2000 Stelias Computing Inc
15  *
16  * HISTORY
17  *
18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
19  *  04/19/99 blf  link, mknod, symlink support
20  */
21
22 #include "udfdecl.h"
23
24 #include "udf_i.h"
25 #include "udf_sb.h"
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/sched.h>
33 #include <linux/crc-itu-t.h>
34 #include <linux/exportfs.h>
35
36 static inline int udf_match(int len1, const unsigned char *name1, int len2,
37                             const unsigned char *name2)
38 {
39         if (len1 != len2)
40                 return 0;
41
42         return !memcmp(name1, name2, len1);
43 }
44
45 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
46                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
47                  uint8_t *impuse, uint8_t *fileident)
48 {
49         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
50         uint16_t crc;
51         int offset;
52         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
53         uint8_t lfi = cfi->lengthFileIdent;
54         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
55                 sizeof(struct fileIdentDesc);
56         int adinicb = 0;
57
58         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
59                 adinicb = 1;
60
61         offset = fibh->soffset + sizeof(struct fileIdentDesc);
62
63         if (impuse) {
64                 if (adinicb || (offset + liu < 0)) {
65                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
66                 } else if (offset >= 0) {
67                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
68                 } else {
69                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
70                         memcpy(fibh->ebh->b_data, impuse - offset,
71                                 liu + offset);
72                 }
73         }
74
75         offset += liu;
76
77         if (fileident) {
78                 if (adinicb || (offset + lfi < 0)) {
79                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
80                 } else if (offset >= 0) {
81                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
82                 } else {
83                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
84                                 -offset);
85                         memcpy(fibh->ebh->b_data, fileident - offset,
86                                 lfi + offset);
87                 }
88         }
89
90         offset += lfi;
91
92         if (adinicb || (offset + padlen < 0)) {
93                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
94         } else if (offset >= 0) {
95                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
96         } else {
97                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
98                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
99         }
100
101         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
102                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
103
104         if (fibh->sbh == fibh->ebh) {
105                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
106                               crclen + sizeof(struct tag) -
107                               sizeof(struct fileIdentDesc));
108         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
109                 crc = crc_itu_t(crc, fibh->ebh->b_data +
110                                         sizeof(struct fileIdentDesc) +
111                                         fibh->soffset,
112                               crclen + sizeof(struct tag) -
113                                         sizeof(struct fileIdentDesc));
114         } else {
115                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
116                               -fibh->soffset - sizeof(struct fileIdentDesc));
117                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
118         }
119
120         cfi->descTag.descCRC = cpu_to_le16(crc);
121         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
122         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
123
124         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
125                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
126                         sizeof(struct fileIdentDesc));
127         } else {
128                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
129                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
130                        sizeof(struct fileIdentDesc) + fibh->soffset);
131         }
132
133         if (adinicb) {
134                 mark_inode_dirty(inode);
135         } else {
136                 if (fibh->sbh != fibh->ebh)
137                         mark_buffer_dirty_inode(fibh->ebh, inode);
138                 mark_buffer_dirty_inode(fibh->sbh, inode);
139         }
140         return 0;
141 }
142
143 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
144                                             const struct qstr *child,
145                                             struct udf_fileident_bh *fibh,
146                                             struct fileIdentDesc *cfi)
147 {
148         struct fileIdentDesc *fi = NULL;
149         loff_t f_pos;
150         int block, flen;
151         unsigned char *fname = NULL;
152         unsigned char *nameptr;
153         uint8_t lfi;
154         uint16_t liu;
155         loff_t size;
156         struct kernel_lb_addr eloc;
157         uint32_t elen;
158         sector_t offset;
159         struct extent_position epos = {};
160         struct udf_inode_info *dinfo = UDF_I(dir);
161         int isdotdot = child->len == 2 &&
162                 child->name[0] == '.' && child->name[1] == '.';
163
164         size = udf_ext0_offset(dir) + dir->i_size;
165         f_pos = udf_ext0_offset(dir);
166
167         fibh->sbh = fibh->ebh = NULL;
168         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
169         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
170                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
171                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
172                         goto out_err;
173                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
174                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
175                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
176                                 epos.offset -= sizeof(struct short_ad);
177                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
178                                 epos.offset -= sizeof(struct long_ad);
179                 } else
180                         offset = 0;
181
182                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
183                 if (!fibh->sbh)
184                         goto out_err;
185         }
186
187         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
188         if (!fname)
189                 goto out_err;
190
191         while (f_pos < size) {
192                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
193                                         &elen, &offset);
194                 if (!fi)
195                         goto out_err;
196
197                 liu = le16_to_cpu(cfi->lengthOfImpUse);
198                 lfi = cfi->lengthFileIdent;
199
200                 if (fibh->sbh == fibh->ebh) {
201                         nameptr = fi->fileIdent + liu;
202                 } else {
203                         int poffset;    /* Unpaded ending offset */
204
205                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
206                                         liu + lfi;
207
208                         if (poffset >= lfi)
209                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
210                                                       poffset - lfi);
211                         else {
212                                 nameptr = fname;
213                                 memcpy(nameptr, fi->fileIdent + liu,
214                                         lfi - poffset);
215                                 memcpy(nameptr + lfi - poffset,
216                                         fibh->ebh->b_data, poffset);
217                         }
218                 }
219
220                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
221                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
222                                 continue;
223                 }
224
225                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
226                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
227                                 continue;
228                 }
229
230                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
231                     isdotdot) {
232                         brelse(epos.bh);
233                         return fi;
234                 }
235
236                 if (!lfi)
237                         continue;
238
239                 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
240                 if (flen && udf_match(flen, fname, child->len, child->name))
241                         goto out_ok;
242         }
243
244 out_err:
245         fi = NULL;
246         if (fibh->sbh != fibh->ebh)
247                 brelse(fibh->ebh);
248         brelse(fibh->sbh);
249 out_ok:
250         brelse(epos.bh);
251         kfree(fname);
252
253         return fi;
254 }
255
256 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
257                                  struct nameidata *nd)
258 {
259         struct inode *inode = NULL;
260         struct fileIdentDesc cfi;
261         struct udf_fileident_bh fibh;
262
263         if (dentry->d_name.len > UDF_NAME_LEN - 2)
264                 return ERR_PTR(-ENAMETOOLONG);
265
266         lock_kernel();
267 #ifdef UDF_RECOVERY
268         /* temporary shorthand for specifying files by inode number */
269         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
270                 struct kernel_lb_addr lb = {
271                         .logicalBlockNum = 0,
272                         .partitionReferenceNum =
273                                 simple_strtoul(dentry->d_name.name + 3,
274                                                 NULL, 0),
275                 };
276                 inode = udf_iget(dir->i_sb, lb);
277                 if (!inode) {
278                         unlock_kernel();
279                         return ERR_PTR(-EACCES);
280                 }
281         } else
282 #endif /* UDF_RECOVERY */
283
284         if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
285                 struct kernel_lb_addr loc;
286
287                 if (fibh.sbh != fibh.ebh)
288                         brelse(fibh.ebh);
289                 brelse(fibh.sbh);
290
291                 loc = lelb_to_cpu(cfi.icb.extLocation);
292                 inode = udf_iget(dir->i_sb, &loc);
293                 if (!inode) {
294                         unlock_kernel();
295                         return ERR_PTR(-EACCES);
296                 }
297         }
298         unlock_kernel();
299
300         return d_splice_alias(inode, dentry);
301 }
302
303 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
304                                            struct dentry *dentry,
305                                            struct udf_fileident_bh *fibh,
306                                            struct fileIdentDesc *cfi, int *err)
307 {
308         struct super_block *sb = dir->i_sb;
309         struct fileIdentDesc *fi = NULL;
310         unsigned char *name = NULL;
311         int namelen;
312         loff_t f_pos;
313         loff_t size = udf_ext0_offset(dir) + dir->i_size;
314         int nfidlen;
315         uint8_t lfi;
316         uint16_t liu;
317         int block;
318         struct kernel_lb_addr eloc;
319         uint32_t elen = 0;
320         sector_t offset;
321         struct extent_position epos = {};
322         struct udf_inode_info *dinfo;
323
324         fibh->sbh = fibh->ebh = NULL;
325         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
326         if (!name) {
327                 *err = -ENOMEM;
328                 goto out_err;
329         }
330
331         if (dentry) {
332                 if (!dentry->d_name.len) {
333                         *err = -EINVAL;
334                         goto out_err;
335                 }
336                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
337                                                  dentry->d_name.len);
338                 if (!namelen) {
339                         *err = -ENAMETOOLONG;
340                         goto out_err;
341                 }
342         } else {
343                 namelen = 0;
344         }
345
346         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
347
348         f_pos = udf_ext0_offset(dir);
349
350         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
351         dinfo = UDF_I(dir);
352         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
353                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
354                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
355                         block = udf_get_lb_pblock(dir->i_sb,
356                                         &dinfo->i_location, 0);
357                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
358                         goto add;
359                 }
360                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
361                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
362                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
363                                 epos.offset -= sizeof(struct short_ad);
364                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
365                                 epos.offset -= sizeof(struct long_ad);
366                 } else
367                         offset = 0;
368
369                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
370                 if (!fibh->sbh) {
371                         *err = -EIO;
372                         goto out_err;
373                 }
374
375                 block = dinfo->i_location.logicalBlockNum;
376         }
377
378         while (f_pos < size) {
379                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
380                                         &elen, &offset);
381
382                 if (!fi) {
383                         *err = -EIO;
384                         goto out_err;
385                 }
386
387                 liu = le16_to_cpu(cfi->lengthOfImpUse);
388                 lfi = cfi->lengthFileIdent;
389
390                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
391                         if (((sizeof(struct fileIdentDesc) +
392                                         liu + lfi + 3) & ~3) == nfidlen) {
393                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
394                                 cfi->fileVersionNum = cpu_to_le16(1);
395                                 cfi->fileCharacteristics = 0;
396                                 cfi->lengthFileIdent = namelen;
397                                 cfi->lengthOfImpUse = cpu_to_le16(0);
398                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
399                                                   name))
400                                         goto out_ok;
401                                 else {
402                                         *err = -EIO;
403                                         goto out_err;
404                                 }
405                         }
406                 }
407         }
408
409 add:
410         f_pos += nfidlen;
411
412         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
413             sb->s_blocksize - fibh->eoffset < nfidlen) {
414                 brelse(epos.bh);
415                 epos.bh = NULL;
416                 fibh->soffset -= udf_ext0_offset(dir);
417                 fibh->eoffset -= udf_ext0_offset(dir);
418                 f_pos -= udf_ext0_offset(dir);
419                 if (fibh->sbh != fibh->ebh)
420                         brelse(fibh->ebh);
421                 brelse(fibh->sbh);
422                 fibh->sbh = fibh->ebh =
423                                 udf_expand_dir_adinicb(dir, &block, err);
424                 if (!fibh->sbh)
425                         goto out_err;
426                 epos.block = dinfo->i_location;
427                 epos.offset = udf_file_entry_alloc_offset(dir);
428                 /* Load extent udf_expand_dir_adinicb() has created */
429                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
430         }
431
432         /* Entry fits into current block? */
433         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
434                 fibh->soffset = fibh->eoffset;
435                 fibh->eoffset += nfidlen;
436                 if (fibh->sbh != fibh->ebh) {
437                         brelse(fibh->sbh);
438                         fibh->sbh = fibh->ebh;
439                 }
440
441                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
442                         block = dinfo->i_location.logicalBlockNum;
443                         fi = (struct fileIdentDesc *)
444                                         (dinfo->i_ext.i_data +
445                                          fibh->soffset -
446                                          udf_ext0_offset(dir) +
447                                          dinfo->i_lenEAttr);
448                 } else {
449                         block = eloc.logicalBlockNum +
450                                         ((elen - 1) >>
451                                                 dir->i_sb->s_blocksize_bits);
452                         fi = (struct fileIdentDesc *)
453                                 (fibh->sbh->b_data + fibh->soffset);
454                 }
455         } else {
456                 /* Round up last extent in the file */
457                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
458                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
459                         epos.offset -= sizeof(struct short_ad);
460                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
461                         epos.offset -= sizeof(struct long_ad);
462                 udf_write_aext(dir, &epos, &eloc, elen, 1);
463                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
464                                         - 1) & ~(sb->s_blocksize - 1);
465
466                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
467                 fibh->eoffset += nfidlen - sb->s_blocksize;
468                 if (fibh->sbh != fibh->ebh) {
469                         brelse(fibh->sbh);
470                         fibh->sbh = fibh->ebh;
471                 }
472
473                 block = eloc.logicalBlockNum + ((elen - 1) >>
474                                                 dir->i_sb->s_blocksize_bits);
475                 fibh->ebh = udf_bread(dir,
476                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
477                 if (!fibh->ebh)
478                         goto out_err;
479
480                 if (!fibh->soffset) {
481                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
482                             (EXT_RECORDED_ALLOCATED >> 30)) {
483                                 block = eloc.logicalBlockNum + ((elen - 1) >>
484                                         dir->i_sb->s_blocksize_bits);
485                         } else
486                                 block++;
487
488                         brelse(fibh->sbh);
489                         fibh->sbh = fibh->ebh;
490                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
491                 } else {
492                         fi = (struct fileIdentDesc *)
493                                 (fibh->sbh->b_data + sb->s_blocksize +
494                                         fibh->soffset);
495                 }
496         }
497
498         memset(cfi, 0, sizeof(struct fileIdentDesc));
499         if (UDF_SB(sb)->s_udfrev >= 0x0200)
500                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
501                             sizeof(struct tag));
502         else
503                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
504                             sizeof(struct tag));
505         cfi->fileVersionNum = cpu_to_le16(1);
506         cfi->lengthFileIdent = namelen;
507         cfi->lengthOfImpUse = cpu_to_le16(0);
508         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
509                 dir->i_size += nfidlen;
510                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
511                         dinfo->i_lenAlloc += nfidlen;
512                 else {
513                         /* Find the last extent and truncate it to proper size */
514                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
515                                 (EXT_RECORDED_ALLOCATED >> 30))
516                                 ;
517                         elen -= dinfo->i_lenExtents - dir->i_size;
518                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
519                                 epos.offset -= sizeof(struct short_ad);
520                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
521                                 epos.offset -= sizeof(struct long_ad);
522                         udf_write_aext(dir, &epos, &eloc, elen, 1);
523                         dinfo->i_lenExtents = dir->i_size;
524                 }
525
526                 mark_inode_dirty(dir);
527                 goto out_ok;
528         } else {
529                 *err = -EIO;
530                 goto out_err;
531         }
532
533 out_err:
534         fi = NULL;
535         if (fibh->sbh != fibh->ebh)
536                 brelse(fibh->ebh);
537         brelse(fibh->sbh);
538 out_ok:
539         brelse(epos.bh);
540         kfree(name);
541         return fi;
542 }
543
544 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
545                             struct udf_fileident_bh *fibh,
546                             struct fileIdentDesc *cfi)
547 {
548         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
549
550         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
551                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
552
553         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
554 }
555
556 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
557                       struct nameidata *nd)
558 {
559         struct udf_fileident_bh fibh;
560         struct inode *inode;
561         struct fileIdentDesc cfi, *fi;
562         int err;
563         struct udf_inode_info *iinfo;
564
565         lock_kernel();
566         inode = udf_new_inode(dir, mode, &err);
567         if (!inode) {
568                 unlock_kernel();
569                 return err;
570         }
571
572         iinfo = UDF_I(inode);
573         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
574                 inode->i_data.a_ops = &udf_adinicb_aops;
575         else
576                 inode->i_data.a_ops = &udf_aops;
577         inode->i_op = &udf_file_inode_operations;
578         inode->i_fop = &udf_file_operations;
579         mark_inode_dirty(inode);
580
581         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
582         if (!fi) {
583                 inode->i_nlink--;
584                 mark_inode_dirty(inode);
585                 iput(inode);
586                 unlock_kernel();
587                 return err;
588         }
589         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
590         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
591         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
592                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
593         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
594         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
595                 mark_inode_dirty(dir);
596         if (fibh.sbh != fibh.ebh)
597                 brelse(fibh.ebh);
598         brelse(fibh.sbh);
599         unlock_kernel();
600         d_instantiate(dentry, inode);
601
602         return 0;
603 }
604
605 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
606                      dev_t rdev)
607 {
608         struct inode *inode;
609         struct udf_fileident_bh fibh;
610         struct fileIdentDesc cfi, *fi;
611         int err;
612         struct udf_inode_info *iinfo;
613
614         if (!old_valid_dev(rdev))
615                 return -EINVAL;
616
617         lock_kernel();
618         err = -EIO;
619         inode = udf_new_inode(dir, mode, &err);
620         if (!inode)
621                 goto out;
622
623         iinfo = UDF_I(inode);
624         init_special_inode(inode, mode, rdev);
625         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
626         if (!fi) {
627                 inode->i_nlink--;
628                 mark_inode_dirty(inode);
629                 iput(inode);
630                 unlock_kernel();
631                 return err;
632         }
633         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
634         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
635         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
636                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
637         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
638         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
639                 mark_inode_dirty(dir);
640         mark_inode_dirty(inode);
641
642         if (fibh.sbh != fibh.ebh)
643                 brelse(fibh.ebh);
644         brelse(fibh.sbh);
645         d_instantiate(dentry, inode);
646         err = 0;
647
648 out:
649         unlock_kernel();
650         return err;
651 }
652
653 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
654 {
655         struct inode *inode;
656         struct udf_fileident_bh fibh;
657         struct fileIdentDesc cfi, *fi;
658         int err;
659         struct udf_inode_info *dinfo = UDF_I(dir);
660         struct udf_inode_info *iinfo;
661
662         lock_kernel();
663         err = -EMLINK;
664         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
665                 goto out;
666
667         err = -EIO;
668         inode = udf_new_inode(dir, S_IFDIR | mode, &err);
669         if (!inode)
670                 goto out;
671
672         iinfo = UDF_I(inode);
673         inode->i_op = &udf_dir_inode_operations;
674         inode->i_fop = &udf_dir_operations;
675         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
676         if (!fi) {
677                 inode->i_nlink--;
678                 mark_inode_dirty(inode);
679                 iput(inode);
680                 goto out;
681         }
682         inode->i_nlink = 2;
683         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
684         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
685         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
686                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
687         cfi.fileCharacteristics =
688                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
689         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
690         brelse(fibh.sbh);
691         mark_inode_dirty(inode);
692
693         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
694         if (!fi) {
695                 inode->i_nlink = 0;
696                 mark_inode_dirty(inode);
697                 iput(inode);
698                 goto out;
699         }
700         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
701         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
702         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
703                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
704         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
705         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
706         inc_nlink(dir);
707         mark_inode_dirty(dir);
708         d_instantiate(dentry, inode);
709         if (fibh.sbh != fibh.ebh)
710                 brelse(fibh.ebh);
711         brelse(fibh.sbh);
712         err = 0;
713
714 out:
715         unlock_kernel();
716         return err;
717 }
718
719 static int empty_dir(struct inode *dir)
720 {
721         struct fileIdentDesc *fi, cfi;
722         struct udf_fileident_bh fibh;
723         loff_t f_pos;
724         loff_t size = udf_ext0_offset(dir) + dir->i_size;
725         int block;
726         struct kernel_lb_addr eloc;
727         uint32_t elen;
728         sector_t offset;
729         struct extent_position epos = {};
730         struct udf_inode_info *dinfo = UDF_I(dir);
731
732         f_pos = udf_ext0_offset(dir);
733         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
734
735         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
736                 fibh.sbh = fibh.ebh = NULL;
737         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
738                               &epos, &eloc, &elen, &offset) ==
739                                         (EXT_RECORDED_ALLOCATED >> 30)) {
740                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
741                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
742                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
743                                 epos.offset -= sizeof(struct short_ad);
744                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
745                                 epos.offset -= sizeof(struct long_ad);
746                 } else
747                         offset = 0;
748
749                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
750                 if (!fibh.sbh) {
751                         brelse(epos.bh);
752                         return 0;
753                 }
754         } else {
755                 brelse(epos.bh);
756                 return 0;
757         }
758
759         while (f_pos < size) {
760                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
761                                         &elen, &offset);
762                 if (!fi) {
763                         if (fibh.sbh != fibh.ebh)
764                                 brelse(fibh.ebh);
765                         brelse(fibh.sbh);
766                         brelse(epos.bh);
767                         return 0;
768                 }
769
770                 if (cfi.lengthFileIdent &&
771                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
772                         if (fibh.sbh != fibh.ebh)
773                                 brelse(fibh.ebh);
774                         brelse(fibh.sbh);
775                         brelse(epos.bh);
776                         return 0;
777                 }
778         }
779
780         if (fibh.sbh != fibh.ebh)
781                 brelse(fibh.ebh);
782         brelse(fibh.sbh);
783         brelse(epos.bh);
784
785         return 1;
786 }
787
788 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
789 {
790         int retval;
791         struct inode *inode = dentry->d_inode;
792         struct udf_fileident_bh fibh;
793         struct fileIdentDesc *fi, cfi;
794         struct kernel_lb_addr tloc;
795
796         retval = -ENOENT;
797         lock_kernel();
798         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
799         if (!fi)
800                 goto out;
801
802         retval = -EIO;
803         tloc = lelb_to_cpu(cfi.icb.extLocation);
804         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
805                 goto end_rmdir;
806         retval = -ENOTEMPTY;
807         if (!empty_dir(inode))
808                 goto end_rmdir;
809         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
810         if (retval)
811                 goto end_rmdir;
812         if (inode->i_nlink != 2)
813                 udf_warning(inode->i_sb, "udf_rmdir",
814                             "empty directory has nlink != 2 (%d)",
815                             inode->i_nlink);
816         clear_nlink(inode);
817         inode->i_size = 0;
818         inode_dec_link_count(dir);
819         inode->i_ctime = dir->i_ctime = dir->i_mtime =
820                                                 current_fs_time(dir->i_sb);
821         mark_inode_dirty(dir);
822
823 end_rmdir:
824         if (fibh.sbh != fibh.ebh)
825                 brelse(fibh.ebh);
826         brelse(fibh.sbh);
827
828 out:
829         unlock_kernel();
830         return retval;
831 }
832
833 static int udf_unlink(struct inode *dir, struct dentry *dentry)
834 {
835         int retval;
836         struct inode *inode = dentry->d_inode;
837         struct udf_fileident_bh fibh;
838         struct fileIdentDesc *fi;
839         struct fileIdentDesc cfi;
840         struct kernel_lb_addr tloc;
841
842         retval = -ENOENT;
843         lock_kernel();
844         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
845         if (!fi)
846                 goto out;
847
848         retval = -EIO;
849         tloc = lelb_to_cpu(cfi.icb.extLocation);
850         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
851                 goto end_unlink;
852
853         if (!inode->i_nlink) {
854                 udf_debug("Deleting nonexistent file (%lu), %d\n",
855                           inode->i_ino, inode->i_nlink);
856                 inode->i_nlink = 1;
857         }
858         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
859         if (retval)
860                 goto end_unlink;
861         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
862         mark_inode_dirty(dir);
863         inode_dec_link_count(inode);
864         inode->i_ctime = dir->i_ctime;
865         retval = 0;
866
867 end_unlink:
868         if (fibh.sbh != fibh.ebh)
869                 brelse(fibh.ebh);
870         brelse(fibh.sbh);
871
872 out:
873         unlock_kernel();
874         return retval;
875 }
876
877 static int udf_symlink(struct inode *dir, struct dentry *dentry,
878                        const char *symname)
879 {
880         struct inode *inode;
881         struct pathComponent *pc;
882         const char *compstart;
883         struct udf_fileident_bh fibh;
884         struct extent_position epos = {};
885         int eoffset, elen = 0;
886         struct fileIdentDesc *fi;
887         struct fileIdentDesc cfi;
888         uint8_t *ea;
889         int err;
890         int block;
891         unsigned char *name = NULL;
892         int namelen;
893         struct buffer_head *bh;
894         struct udf_inode_info *iinfo;
895
896         lock_kernel();
897         inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
898         if (!inode)
899                 goto out;
900
901         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
902         if (!name) {
903                 err = -ENOMEM;
904                 goto out_no_entry;
905         }
906
907         iinfo = UDF_I(inode);
908         inode->i_data.a_ops = &udf_symlink_aops;
909         inode->i_op = &udf_symlink_inode_operations;
910
911         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
912                 struct kernel_lb_addr eloc;
913                 uint32_t bsize;
914
915                 block = udf_new_block(inode->i_sb, inode,
916                                 iinfo->i_location.partitionReferenceNum,
917                                 iinfo->i_location.logicalBlockNum, &err);
918                 if (!block)
919                         goto out_no_entry;
920                 epos.block = iinfo->i_location;
921                 epos.offset = udf_file_entry_alloc_offset(inode);
922                 epos.bh = NULL;
923                 eloc.logicalBlockNum = block;
924                 eloc.partitionReferenceNum =
925                                 iinfo->i_location.partitionReferenceNum;
926                 bsize = inode->i_sb->s_blocksize;
927                 iinfo->i_lenExtents = bsize;
928                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
929                 brelse(epos.bh);
930
931                 block = udf_get_pblock(inode->i_sb, block,
932                                 iinfo->i_location.partitionReferenceNum,
933                                 0);
934                 epos.bh = udf_tgetblk(inode->i_sb, block);
935                 lock_buffer(epos.bh);
936                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
937                 set_buffer_uptodate(epos.bh);
938                 unlock_buffer(epos.bh);
939                 mark_buffer_dirty_inode(epos.bh, inode);
940                 ea = epos.bh->b_data + udf_ext0_offset(inode);
941         } else
942                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
943
944         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
945         pc = (struct pathComponent *)ea;
946
947         if (*symname == '/') {
948                 do {
949                         symname++;
950                 } while (*symname == '/');
951
952                 pc->componentType = 1;
953                 pc->lengthComponentIdent = 0;
954                 pc->componentFileVersionNum = 0;
955                 elen += sizeof(struct pathComponent);
956         }
957
958         err = -ENAMETOOLONG;
959
960         while (*symname) {
961                 if (elen + sizeof(struct pathComponent) > eoffset)
962                         goto out_no_entry;
963
964                 pc = (struct pathComponent *)(ea + elen);
965
966                 compstart = symname;
967
968                 do {
969                         symname++;
970                 } while (*symname && *symname != '/');
971
972                 pc->componentType = 5;
973                 pc->lengthComponentIdent = 0;
974                 pc->componentFileVersionNum = 0;
975                 if (compstart[0] == '.') {
976                         if ((symname - compstart) == 1)
977                                 pc->componentType = 4;
978                         else if ((symname - compstart) == 2 &&
979                                         compstart[1] == '.')
980                                 pc->componentType = 3;
981                 }
982
983                 if (pc->componentType == 5) {
984                         namelen = udf_put_filename(inode->i_sb, compstart, name,
985                                                    symname - compstart);
986                         if (!namelen)
987                                 goto out_no_entry;
988
989                         if (elen + sizeof(struct pathComponent) + namelen >
990                                         eoffset)
991                                 goto out_no_entry;
992                         else
993                                 pc->lengthComponentIdent = namelen;
994
995                         memcpy(pc->componentIdent, name, namelen);
996                 }
997
998                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
999
1000                 if (*symname) {
1001                         do {
1002                                 symname++;
1003                         } while (*symname == '/');
1004                 }
1005         }
1006
1007         brelse(epos.bh);
1008         inode->i_size = elen;
1009         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1010                 iinfo->i_lenAlloc = inode->i_size;
1011         else
1012                 udf_truncate_tail_extent(inode);
1013         mark_inode_dirty(inode);
1014
1015         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1016         if (!fi)
1017                 goto out_no_entry;
1018         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1019         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1020         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1021         if (bh) {
1022                 struct logicalVolIntegrityDesc *lvid =
1023                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1024                 struct logicalVolHeaderDesc *lvhd;
1025                 uint64_t uniqueID;
1026                 lvhd = (struct logicalVolHeaderDesc *)
1027                                 lvid->logicalVolContentsUse;
1028                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1029                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1030                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1031                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1032                         uniqueID += 16;
1033                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1034                 mark_buffer_dirty(bh);
1035         }
1036         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1037         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1038                 mark_inode_dirty(dir);
1039         if (fibh.sbh != fibh.ebh)
1040                 brelse(fibh.ebh);
1041         brelse(fibh.sbh);
1042         d_instantiate(dentry, inode);
1043         err = 0;
1044
1045 out:
1046         kfree(name);
1047         unlock_kernel();
1048         return err;
1049
1050 out_no_entry:
1051         inode_dec_link_count(inode);
1052         iput(inode);
1053         goto out;
1054 }
1055
1056 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1057                     struct dentry *dentry)
1058 {
1059         struct inode *inode = old_dentry->d_inode;
1060         struct udf_fileident_bh fibh;
1061         struct fileIdentDesc cfi, *fi;
1062         int err;
1063         struct buffer_head *bh;
1064
1065         lock_kernel();
1066         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1067                 unlock_kernel();
1068                 return -EMLINK;
1069         }
1070
1071         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1072         if (!fi) {
1073                 unlock_kernel();
1074                 return err;
1075         }
1076         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1077         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1078         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1079         if (bh) {
1080                 struct logicalVolIntegrityDesc *lvid =
1081                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1082                 struct logicalVolHeaderDesc *lvhd;
1083                 uint64_t uniqueID;
1084                 lvhd = (struct logicalVolHeaderDesc *)
1085                                 (lvid->logicalVolContentsUse);
1086                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1087                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1088                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1089                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1090                         uniqueID += 16;
1091                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1092                 mark_buffer_dirty(bh);
1093         }
1094         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1095         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1096                 mark_inode_dirty(dir);
1097
1098         if (fibh.sbh != fibh.ebh)
1099                 brelse(fibh.ebh);
1100         brelse(fibh.sbh);
1101         inc_nlink(inode);
1102         inode->i_ctime = current_fs_time(inode->i_sb);
1103         mark_inode_dirty(inode);
1104         ihold(inode);
1105         d_instantiate(dentry, inode);
1106         unlock_kernel();
1107
1108         return 0;
1109 }
1110
1111 /* Anybody can rename anything with this: the permission checks are left to the
1112  * higher-level routines.
1113  */
1114 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1115                       struct inode *new_dir, struct dentry *new_dentry)
1116 {
1117         struct inode *old_inode = old_dentry->d_inode;
1118         struct inode *new_inode = new_dentry->d_inode;
1119         struct udf_fileident_bh ofibh, nfibh;
1120         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1121         struct fileIdentDesc ocfi, ncfi;
1122         struct buffer_head *dir_bh = NULL;
1123         int retval = -ENOENT;
1124         struct kernel_lb_addr tloc;
1125         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1126
1127         lock_kernel();
1128         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1129         if (ofi) {
1130                 if (ofibh.sbh != ofibh.ebh)
1131                         brelse(ofibh.ebh);
1132                 brelse(ofibh.sbh);
1133         }
1134         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1135         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1136             != old_inode->i_ino)
1137                 goto end_rename;
1138
1139         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1140         if (nfi) {
1141                 if (!new_inode) {
1142                         if (nfibh.sbh != nfibh.ebh)
1143                                 brelse(nfibh.ebh);
1144                         brelse(nfibh.sbh);
1145                         nfi = NULL;
1146                 }
1147         }
1148         if (S_ISDIR(old_inode->i_mode)) {
1149                 int offset = udf_ext0_offset(old_inode);
1150
1151                 if (new_inode) {
1152                         retval = -ENOTEMPTY;
1153                         if (!empty_dir(new_inode))
1154                                 goto end_rename;
1155                 }
1156                 retval = -EIO;
1157                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1158                         dir_fi = udf_get_fileident(
1159                                         old_iinfo->i_ext.i_data -
1160                                           (old_iinfo->i_efe ?
1161                                            sizeof(struct extendedFileEntry) :
1162                                            sizeof(struct fileEntry)),
1163                                         old_inode->i_sb->s_blocksize, &offset);
1164                 } else {
1165                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1166                         if (!dir_bh)
1167                                 goto end_rename;
1168                         dir_fi = udf_get_fileident(dir_bh->b_data,
1169                                         old_inode->i_sb->s_blocksize, &offset);
1170                 }
1171                 if (!dir_fi)
1172                         goto end_rename;
1173                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1174                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1175                                 old_dir->i_ino)
1176                         goto end_rename;
1177
1178                 retval = -EMLINK;
1179                 if (!new_inode &&
1180                         new_dir->i_nlink >=
1181                                 (256 << sizeof(new_dir->i_nlink)) - 1)
1182                         goto end_rename;
1183         }
1184         if (!nfi) {
1185                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1186                                     &retval);
1187                 if (!nfi)
1188                         goto end_rename;
1189         }
1190
1191         /*
1192          * Like most other Unix systems, set the ctime for inodes on a
1193          * rename.
1194          */
1195         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1196         mark_inode_dirty(old_inode);
1197
1198         /*
1199          * ok, that's it
1200          */
1201         ncfi.fileVersionNum = ocfi.fileVersionNum;
1202         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1203         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1204         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1205
1206         /* The old fid may have moved - find it again */
1207         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1208         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1209
1210         if (new_inode) {
1211                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1212                 inode_dec_link_count(new_inode);
1213         }
1214         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1215         mark_inode_dirty(old_dir);
1216
1217         if (dir_fi) {
1218                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1219                 udf_update_tag((char *)dir_fi,
1220                                 (sizeof(struct fileIdentDesc) +
1221                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1222                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1223                         mark_inode_dirty(old_inode);
1224                 else
1225                         mark_buffer_dirty_inode(dir_bh, old_inode);
1226
1227                 inode_dec_link_count(old_dir);
1228                 if (new_inode)
1229                         inode_dec_link_count(new_inode);
1230                 else {
1231                         inc_nlink(new_dir);
1232                         mark_inode_dirty(new_dir);
1233                 }
1234         }
1235
1236         if (ofi) {
1237                 if (ofibh.sbh != ofibh.ebh)
1238                         brelse(ofibh.ebh);
1239                 brelse(ofibh.sbh);
1240         }
1241
1242         retval = 0;
1243
1244 end_rename:
1245         brelse(dir_bh);
1246         if (nfi) {
1247                 if (nfibh.sbh != nfibh.ebh)
1248                         brelse(nfibh.ebh);
1249                 brelse(nfibh.sbh);
1250         }
1251         unlock_kernel();
1252
1253         return retval;
1254 }
1255
1256 static struct dentry *udf_get_parent(struct dentry *child)
1257 {
1258         struct kernel_lb_addr tloc;
1259         struct inode *inode = NULL;
1260         struct qstr dotdot = {.name = "..", .len = 2};
1261         struct fileIdentDesc cfi;
1262         struct udf_fileident_bh fibh;
1263
1264         lock_kernel();
1265         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1266                 goto out_unlock;
1267
1268         if (fibh.sbh != fibh.ebh)
1269                 brelse(fibh.ebh);
1270         brelse(fibh.sbh);
1271
1272         tloc = lelb_to_cpu(cfi.icb.extLocation);
1273         inode = udf_iget(child->d_inode->i_sb, &tloc);
1274         if (!inode)
1275                 goto out_unlock;
1276         unlock_kernel();
1277
1278         return d_obtain_alias(inode);
1279 out_unlock:
1280         unlock_kernel();
1281         return ERR_PTR(-EACCES);
1282 }
1283
1284
1285 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1286                                         u16 partref, __u32 generation)
1287 {
1288         struct inode *inode;
1289         struct kernel_lb_addr loc;
1290
1291         if (block == 0)
1292                 return ERR_PTR(-ESTALE);
1293
1294         loc.logicalBlockNum = block;
1295         loc.partitionReferenceNum = partref;
1296         inode = udf_iget(sb, &loc);
1297
1298         if (inode == NULL)
1299                 return ERR_PTR(-ENOMEM);
1300
1301         if (generation && inode->i_generation != generation) {
1302                 iput(inode);
1303                 return ERR_PTR(-ESTALE);
1304         }
1305         return d_obtain_alias(inode);
1306 }
1307
1308 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1309                                        struct fid *fid, int fh_len, int fh_type)
1310 {
1311         if ((fh_len != 3 && fh_len != 5) ||
1312             (fh_type != FILEID_UDF_WITH_PARENT &&
1313              fh_type != FILEID_UDF_WITHOUT_PARENT))
1314                 return NULL;
1315
1316         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1317                         fid->udf.generation);
1318 }
1319
1320 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1321                                        struct fid *fid, int fh_len, int fh_type)
1322 {
1323         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1324                 return NULL;
1325
1326         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1327                                  fid->udf.parent_partref,
1328                                  fid->udf.parent_generation);
1329 }
1330 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1331                          int connectable)
1332 {
1333         int len = *lenp;
1334         struct inode *inode =  de->d_inode;
1335         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1336         struct fid *fid = (struct fid *)fh;
1337         int type = FILEID_UDF_WITHOUT_PARENT;
1338
1339         if (len < 3 || (connectable && len < 5))
1340                 return 255;
1341
1342         *lenp = 3;
1343         fid->udf.block = location.logicalBlockNum;
1344         fid->udf.partref = location.partitionReferenceNum;
1345         fid->udf.generation = inode->i_generation;
1346
1347         if (connectable && !S_ISDIR(inode->i_mode)) {
1348                 spin_lock(&de->d_lock);
1349                 inode = de->d_parent->d_inode;
1350                 location = UDF_I(inode)->i_location;
1351                 fid->udf.parent_block = location.logicalBlockNum;
1352                 fid->udf.parent_partref = location.partitionReferenceNum;
1353                 fid->udf.parent_generation = inode->i_generation;
1354                 spin_unlock(&de->d_lock);
1355                 *lenp = 5;
1356                 type = FILEID_UDF_WITH_PARENT;
1357         }
1358
1359         return type;
1360 }
1361
1362 const struct export_operations udf_export_ops = {
1363         .encode_fh      = udf_encode_fh,
1364         .fh_to_dentry   = udf_fh_to_dentry,
1365         .fh_to_parent   = udf_fh_to_parent,
1366         .get_parent     = udf_get_parent,
1367 };
1368
1369 const struct inode_operations udf_dir_inode_operations = {
1370         .lookup                         = udf_lookup,
1371         .create                         = udf_create,
1372         .link                           = udf_link,
1373         .unlink                         = udf_unlink,
1374         .symlink                        = udf_symlink,
1375         .mkdir                          = udf_mkdir,
1376         .rmdir                          = udf_rmdir,
1377         .mknod                          = udf_mknod,
1378         .rename                         = udf_rename,
1379 };
1380 const struct inode_operations udf_symlink_inode_operations = {
1381         .readlink       = generic_readlink,
1382         .follow_link    = page_follow_link_light,
1383         .put_link       = page_put_link,
1384 };