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