Merge branch 'topic/hda' into for-linus
[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(struct 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(struct tag),
103                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
104
105         if (fibh->sbh == fibh->ebh) {
106                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
107                               crclen + sizeof(struct 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(struct 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         struct 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(struct short_ad);
178                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
179                                 epos.offset -= sizeof(struct 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                 struct 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                 struct kernel_lb_addr loc;
287
288                 if (fibh.sbh != fibh.ebh)
289                         brelse(fibh.ebh);
290                 brelse(fibh.sbh);
291
292                 loc = lelb_to_cpu(cfi.icb.extLocation);
293                 inode = udf_iget(dir->i_sb, &loc);
294                 if (!inode) {
295                         unlock_kernel();
296                         return ERR_PTR(-EACCES);
297                 }
298         }
299         unlock_kernel();
300
301         return d_splice_alias(inode, dentry);
302 }
303
304 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
305                                            struct dentry *dentry,
306                                            struct udf_fileident_bh *fibh,
307                                            struct fileIdentDesc *cfi, int *err)
308 {
309         struct super_block *sb = dir->i_sb;
310         struct fileIdentDesc *fi = NULL;
311         char *name = NULL;
312         int namelen;
313         loff_t f_pos;
314         loff_t size = udf_ext0_offset(dir) + dir->i_size;
315         int nfidlen;
316         uint8_t lfi;
317         uint16_t liu;
318         int block;
319         struct kernel_lb_addr eloc;
320         uint32_t elen = 0;
321         sector_t offset;
322         struct extent_position epos = {};
323         struct udf_inode_info *dinfo;
324
325         fibh->sbh = fibh->ebh = NULL;
326         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
327         if (!name) {
328                 *err = -ENOMEM;
329                 goto out_err;
330         }
331
332         if (dentry) {
333                 if (!dentry->d_name.len) {
334                         *err = -EINVAL;
335                         goto out_err;
336                 }
337                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
338                                                  dentry->d_name.len);
339                 if (!namelen) {
340                         *err = -ENAMETOOLONG;
341                         goto out_err;
342                 }
343         } else {
344                 namelen = 0;
345         }
346
347         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
348
349         f_pos = udf_ext0_offset(dir);
350
351         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
352         dinfo = UDF_I(dir);
353         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
354                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
355                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
356                         block = udf_get_lb_pblock(dir->i_sb,
357                                         &dinfo->i_location, 0);
358                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
359                         goto add;
360                 }
361                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
362                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
363                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
364                                 epos.offset -= sizeof(struct short_ad);
365                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
366                                 epos.offset -= sizeof(struct long_ad);
367                 } else
368                         offset = 0;
369
370                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
371                 if (!fibh->sbh) {
372                         *err = -EIO;
373                         goto out_err;
374                 }
375
376                 block = dinfo->i_location.logicalBlockNum;
377         }
378
379         while (f_pos < size) {
380                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
381                                         &elen, &offset);
382
383                 if (!fi) {
384                         *err = -EIO;
385                         goto out_err;
386                 }
387
388                 liu = le16_to_cpu(cfi->lengthOfImpUse);
389                 lfi = cfi->lengthFileIdent;
390
391                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
392                         if (((sizeof(struct fileIdentDesc) +
393                                         liu + lfi + 3) & ~3) == nfidlen) {
394                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
395                                 cfi->fileVersionNum = cpu_to_le16(1);
396                                 cfi->fileCharacteristics = 0;
397                                 cfi->lengthFileIdent = namelen;
398                                 cfi->lengthOfImpUse = cpu_to_le16(0);
399                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
400                                                   name))
401                                         goto out_ok;
402                                 else {
403                                         *err = -EIO;
404                                         goto out_err;
405                                 }
406                         }
407                 }
408         }
409
410 add:
411         /* Is there any extent whose size we need to round up? */
412         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) {
413                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
414                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
415                         epos.offset -= sizeof(struct short_ad);
416                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
417                         epos.offset -= sizeof(struct long_ad);
418                 udf_write_aext(dir, &epos, &eloc, elen, 1);
419         }
420         f_pos += nfidlen;
421
422         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
423             sb->s_blocksize - fibh->eoffset < nfidlen) {
424                 brelse(epos.bh);
425                 epos.bh = NULL;
426                 fibh->soffset -= udf_ext0_offset(dir);
427                 fibh->eoffset -= udf_ext0_offset(dir);
428                 f_pos -= udf_ext0_offset(dir);
429                 if (fibh->sbh != fibh->ebh)
430                         brelse(fibh->ebh);
431                 brelse(fibh->sbh);
432                 fibh->sbh = fibh->ebh =
433                                 udf_expand_dir_adinicb(dir, &block, err);
434                 if (!fibh->sbh)
435                         goto out_err;
436                 epos.block = dinfo->i_location;
437                 epos.offset = udf_file_entry_alloc_offset(dir);
438                 /* Load extent udf_expand_dir_adinicb() has created */
439                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
440         }
441
442         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
443                 fibh->soffset = fibh->eoffset;
444                 fibh->eoffset += nfidlen;
445                 if (fibh->sbh != fibh->ebh) {
446                         brelse(fibh->sbh);
447                         fibh->sbh = fibh->ebh;
448                 }
449
450                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
451                         block = dinfo->i_location.logicalBlockNum;
452                         fi = (struct fileIdentDesc *)
453                                         (dinfo->i_ext.i_data +
454                                          fibh->soffset -
455                                          udf_ext0_offset(dir) +
456                                          dinfo->i_lenEAttr);
457                 } else {
458                         block = eloc.logicalBlockNum +
459                                         ((elen - 1) >>
460                                                 dir->i_sb->s_blocksize_bits);
461                         fi = (struct fileIdentDesc *)
462                                 (fibh->sbh->b_data + fibh->soffset);
463                 }
464         } else {
465                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
466                 fibh->eoffset += nfidlen - sb->s_blocksize;
467                 if (fibh->sbh != fibh->ebh) {
468                         brelse(fibh->sbh);
469                         fibh->sbh = fibh->ebh;
470                 }
471
472                 block = eloc.logicalBlockNum + ((elen - 1) >>
473                                                 dir->i_sb->s_blocksize_bits);
474                 fibh->ebh = udf_bread(dir,
475                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
476                 if (!fibh->ebh)
477                         goto out_err;
478
479                 if (!fibh->soffset) {
480                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
481                             (EXT_RECORDED_ALLOCATED >> 30)) {
482                                 block = eloc.logicalBlockNum + ((elen - 1) >>
483                                         dir->i_sb->s_blocksize_bits);
484                         } else
485                                 block++;
486
487                         brelse(fibh->sbh);
488                         fibh->sbh = fibh->ebh;
489                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
490                 } else {
491                         fi = (struct fileIdentDesc *)
492                                 (fibh->sbh->b_data + sb->s_blocksize +
493                                         fibh->soffset);
494                 }
495         }
496
497         memset(cfi, 0, sizeof(struct fileIdentDesc));
498         if (UDF_SB(sb)->s_udfrev >= 0x0200)
499                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
500                             sizeof(struct tag));
501         else
502                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
503                             sizeof(struct tag));
504         cfi->fileVersionNum = cpu_to_le16(1);
505         cfi->lengthFileIdent = namelen;
506         cfi->lengthOfImpUse = cpu_to_le16(0);
507         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
508                 dir->i_size += nfidlen;
509                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
510                         dinfo->i_lenAlloc += nfidlen;
511                 mark_inode_dirty(dir);
512                 goto out_ok;
513         } else {
514                 *err = -EIO;
515                 goto out_err;
516         }
517
518 out_err:
519         fi = NULL;
520         if (fibh->sbh != fibh->ebh)
521                 brelse(fibh->ebh);
522         brelse(fibh->sbh);
523 out_ok:
524         brelse(epos.bh);
525         kfree(name);
526         return fi;
527 }
528
529 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
530                             struct udf_fileident_bh *fibh,
531                             struct fileIdentDesc *cfi)
532 {
533         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
534
535         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
536                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
537
538         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
539 }
540
541 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
542                       struct nameidata *nd)
543 {
544         struct udf_fileident_bh fibh;
545         struct inode *inode;
546         struct fileIdentDesc cfi, *fi;
547         int err;
548         struct udf_inode_info *iinfo;
549
550         lock_kernel();
551         inode = udf_new_inode(dir, mode, &err);
552         if (!inode) {
553                 unlock_kernel();
554                 return err;
555         }
556
557         iinfo = UDF_I(inode);
558         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
559                 inode->i_data.a_ops = &udf_adinicb_aops;
560         else
561                 inode->i_data.a_ops = &udf_aops;
562         inode->i_op = &udf_file_inode_operations;
563         inode->i_fop = &udf_file_operations;
564         inode->i_mode = mode;
565         mark_inode_dirty(inode);
566
567         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
568         if (!fi) {
569                 inode->i_nlink--;
570                 mark_inode_dirty(inode);
571                 iput(inode);
572                 unlock_kernel();
573                 return err;
574         }
575         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
576         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
577         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
578                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
579         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
580         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
581                 mark_inode_dirty(dir);
582         if (fibh.sbh != fibh.ebh)
583                 brelse(fibh.ebh);
584         brelse(fibh.sbh);
585         unlock_kernel();
586         d_instantiate(dentry, inode);
587
588         return 0;
589 }
590
591 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
592                      dev_t rdev)
593 {
594         struct inode *inode;
595         struct udf_fileident_bh fibh;
596         struct fileIdentDesc cfi, *fi;
597         int err;
598         struct udf_inode_info *iinfo;
599
600         if (!old_valid_dev(rdev))
601                 return -EINVAL;
602
603         lock_kernel();
604         err = -EIO;
605         inode = udf_new_inode(dir, mode, &err);
606         if (!inode)
607                 goto out;
608
609         iinfo = UDF_I(inode);
610         inode->i_uid = current_fsuid();
611         init_special_inode(inode, mode, rdev);
612         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
613         if (!fi) {
614                 inode->i_nlink--;
615                 mark_inode_dirty(inode);
616                 iput(inode);
617                 unlock_kernel();
618                 return err;
619         }
620         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
621         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
622         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
623                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
624         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
625         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
626                 mark_inode_dirty(dir);
627         mark_inode_dirty(inode);
628
629         if (fibh.sbh != fibh.ebh)
630                 brelse(fibh.ebh);
631         brelse(fibh.sbh);
632         d_instantiate(dentry, inode);
633         err = 0;
634
635 out:
636         unlock_kernel();
637         return err;
638 }
639
640 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
641 {
642         struct inode *inode;
643         struct udf_fileident_bh fibh;
644         struct fileIdentDesc cfi, *fi;
645         int err;
646         struct udf_inode_info *dinfo = UDF_I(dir);
647         struct udf_inode_info *iinfo;
648
649         lock_kernel();
650         err = -EMLINK;
651         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
652                 goto out;
653
654         err = -EIO;
655         inode = udf_new_inode(dir, S_IFDIR, &err);
656         if (!inode)
657                 goto out;
658
659         iinfo = UDF_I(inode);
660         inode->i_op = &udf_dir_inode_operations;
661         inode->i_fop = &udf_dir_operations;
662         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
663         if (!fi) {
664                 inode->i_nlink--;
665                 mark_inode_dirty(inode);
666                 iput(inode);
667                 goto out;
668         }
669         inode->i_nlink = 2;
670         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
671         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
672         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
673                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
674         cfi.fileCharacteristics =
675                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
676         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
677         brelse(fibh.sbh);
678         inode->i_mode = S_IFDIR | mode;
679         if (dir->i_mode & S_ISGID)
680                 inode->i_mode |= S_ISGID;
681         mark_inode_dirty(inode);
682
683         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
684         if (!fi) {
685                 inode->i_nlink = 0;
686                 mark_inode_dirty(inode);
687                 iput(inode);
688                 goto out;
689         }
690         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
691         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
692         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
693                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
694         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
695         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
696         inc_nlink(dir);
697         mark_inode_dirty(dir);
698         d_instantiate(dentry, inode);
699         if (fibh.sbh != fibh.ebh)
700                 brelse(fibh.ebh);
701         brelse(fibh.sbh);
702         err = 0;
703
704 out:
705         unlock_kernel();
706         return err;
707 }
708
709 static int empty_dir(struct inode *dir)
710 {
711         struct fileIdentDesc *fi, cfi;
712         struct udf_fileident_bh fibh;
713         loff_t f_pos;
714         loff_t size = udf_ext0_offset(dir) + dir->i_size;
715         int block;
716         struct kernel_lb_addr eloc;
717         uint32_t elen;
718         sector_t offset;
719         struct extent_position epos = {};
720         struct udf_inode_info *dinfo = UDF_I(dir);
721
722         f_pos = udf_ext0_offset(dir);
723         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
724
725         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
726                 fibh.sbh = fibh.ebh = NULL;
727         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
728                               &epos, &eloc, &elen, &offset) ==
729                                         (EXT_RECORDED_ALLOCATED >> 30)) {
730                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
731                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
732                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
733                                 epos.offset -= sizeof(struct short_ad);
734                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
735                                 epos.offset -= sizeof(struct long_ad);
736                 } else
737                         offset = 0;
738
739                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
740                 if (!fibh.sbh) {
741                         brelse(epos.bh);
742                         return 0;
743                 }
744         } else {
745                 brelse(epos.bh);
746                 return 0;
747         }
748
749         while (f_pos < size) {
750                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
751                                         &elen, &offset);
752                 if (!fi) {
753                         if (fibh.sbh != fibh.ebh)
754                                 brelse(fibh.ebh);
755                         brelse(fibh.sbh);
756                         brelse(epos.bh);
757                         return 0;
758                 }
759
760                 if (cfi.lengthFileIdent &&
761                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
762                         if (fibh.sbh != fibh.ebh)
763                                 brelse(fibh.ebh);
764                         brelse(fibh.sbh);
765                         brelse(epos.bh);
766                         return 0;
767                 }
768         }
769
770         if (fibh.sbh != fibh.ebh)
771                 brelse(fibh.ebh);
772         brelse(fibh.sbh);
773         brelse(epos.bh);
774
775         return 1;
776 }
777
778 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
779 {
780         int retval;
781         struct inode *inode = dentry->d_inode;
782         struct udf_fileident_bh fibh;
783         struct fileIdentDesc *fi, cfi;
784         struct kernel_lb_addr tloc;
785
786         retval = -ENOENT;
787         lock_kernel();
788         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
789         if (!fi)
790                 goto out;
791
792         retval = -EIO;
793         tloc = lelb_to_cpu(cfi.icb.extLocation);
794         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
795                 goto end_rmdir;
796         retval = -ENOTEMPTY;
797         if (!empty_dir(inode))
798                 goto end_rmdir;
799         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
800         if (retval)
801                 goto end_rmdir;
802         if (inode->i_nlink != 2)
803                 udf_warning(inode->i_sb, "udf_rmdir",
804                             "empty directory has nlink != 2 (%d)",
805                             inode->i_nlink);
806         clear_nlink(inode);
807         inode->i_size = 0;
808         inode_dec_link_count(dir);
809         inode->i_ctime = dir->i_ctime = dir->i_mtime =
810                                                 current_fs_time(dir->i_sb);
811         mark_inode_dirty(dir);
812
813 end_rmdir:
814         if (fibh.sbh != fibh.ebh)
815                 brelse(fibh.ebh);
816         brelse(fibh.sbh);
817
818 out:
819         unlock_kernel();
820         return retval;
821 }
822
823 static int udf_unlink(struct inode *dir, struct dentry *dentry)
824 {
825         int retval;
826         struct inode *inode = dentry->d_inode;
827         struct udf_fileident_bh fibh;
828         struct fileIdentDesc *fi;
829         struct fileIdentDesc cfi;
830         struct kernel_lb_addr tloc;
831
832         retval = -ENOENT;
833         lock_kernel();
834         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
835         if (!fi)
836                 goto out;
837
838         retval = -EIO;
839         tloc = lelb_to_cpu(cfi.icb.extLocation);
840         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
841                 goto end_unlink;
842
843         if (!inode->i_nlink) {
844                 udf_debug("Deleting nonexistent file (%lu), %d\n",
845                           inode->i_ino, inode->i_nlink);
846                 inode->i_nlink = 1;
847         }
848         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
849         if (retval)
850                 goto end_unlink;
851         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
852         mark_inode_dirty(dir);
853         inode_dec_link_count(inode);
854         inode->i_ctime = dir->i_ctime;
855         retval = 0;
856
857 end_unlink:
858         if (fibh.sbh != fibh.ebh)
859                 brelse(fibh.ebh);
860         brelse(fibh.sbh);
861
862 out:
863         unlock_kernel();
864         return retval;
865 }
866
867 static int udf_symlink(struct inode *dir, struct dentry *dentry,
868                        const char *symname)
869 {
870         struct inode *inode;
871         struct pathComponent *pc;
872         char *compstart;
873         struct udf_fileident_bh fibh;
874         struct extent_position epos = {};
875         int eoffset, elen = 0;
876         struct fileIdentDesc *fi;
877         struct fileIdentDesc cfi;
878         char *ea;
879         int err;
880         int block;
881         char *name = NULL;
882         int namelen;
883         struct buffer_head *bh;
884         struct udf_inode_info *iinfo;
885
886         lock_kernel();
887         inode = udf_new_inode(dir, S_IFLNK, &err);
888         if (!inode)
889                 goto out;
890
891         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
892         if (!name) {
893                 err = -ENOMEM;
894                 goto out_no_entry;
895         }
896
897         iinfo = UDF_I(inode);
898         inode->i_mode = S_IFLNK | S_IRWXUGO;
899         inode->i_data.a_ops = &udf_symlink_aops;
900         inode->i_op = &page_symlink_inode_operations;
901
902         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
903                 struct kernel_lb_addr eloc;
904                 uint32_t bsize;
905
906                 block = udf_new_block(inode->i_sb, inode,
907                                 iinfo->i_location.partitionReferenceNum,
908                                 iinfo->i_location.logicalBlockNum, &err);
909                 if (!block)
910                         goto out_no_entry;
911                 epos.block = iinfo->i_location;
912                 epos.offset = udf_file_entry_alloc_offset(inode);
913                 epos.bh = NULL;
914                 eloc.logicalBlockNum = block;
915                 eloc.partitionReferenceNum =
916                                 iinfo->i_location.partitionReferenceNum;
917                 bsize = inode->i_sb->s_blocksize;
918                 iinfo->i_lenExtents = bsize;
919                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
920                 brelse(epos.bh);
921
922                 block = udf_get_pblock(inode->i_sb, block,
923                                 iinfo->i_location.partitionReferenceNum,
924                                 0);
925                 epos.bh = udf_tread(inode->i_sb, block);
926                 lock_buffer(epos.bh);
927                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
928                 set_buffer_uptodate(epos.bh);
929                 unlock_buffer(epos.bh);
930                 mark_buffer_dirty_inode(epos.bh, inode);
931                 ea = epos.bh->b_data + udf_ext0_offset(inode);
932         } else
933                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
934
935         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
936         pc = (struct pathComponent *)ea;
937
938         if (*symname == '/') {
939                 do {
940                         symname++;
941                 } while (*symname == '/');
942
943                 pc->componentType = 1;
944                 pc->lengthComponentIdent = 0;
945                 pc->componentFileVersionNum = 0;
946                 pc += sizeof(struct pathComponent);
947                 elen += sizeof(struct pathComponent);
948         }
949
950         err = -ENAMETOOLONG;
951
952         while (*symname) {
953                 if (elen + sizeof(struct pathComponent) > eoffset)
954                         goto out_no_entry;
955
956                 pc = (struct pathComponent *)(ea + elen);
957
958                 compstart = (char *)symname;
959
960                 do {
961                         symname++;
962                 } while (*symname && *symname != '/');
963
964                 pc->componentType = 5;
965                 pc->lengthComponentIdent = 0;
966                 pc->componentFileVersionNum = 0;
967                 if (compstart[0] == '.') {
968                         if ((symname - compstart) == 1)
969                                 pc->componentType = 4;
970                         else if ((symname - compstart) == 2 &&
971                                         compstart[1] == '.')
972                                 pc->componentType = 3;
973                 }
974
975                 if (pc->componentType == 5) {
976                         namelen = udf_put_filename(inode->i_sb, compstart, name,
977                                                    symname - compstart);
978                         if (!namelen)
979                                 goto out_no_entry;
980
981                         if (elen + sizeof(struct pathComponent) + namelen >
982                                         eoffset)
983                                 goto out_no_entry;
984                         else
985                                 pc->lengthComponentIdent = namelen;
986
987                         memcpy(pc->componentIdent, name, namelen);
988                 }
989
990                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
991
992                 if (*symname) {
993                         do {
994                                 symname++;
995                         } while (*symname == '/');
996                 }
997         }
998
999         brelse(epos.bh);
1000         inode->i_size = elen;
1001         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1002                 iinfo->i_lenAlloc = inode->i_size;
1003         mark_inode_dirty(inode);
1004
1005         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1006         if (!fi)
1007                 goto out_no_entry;
1008         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1009         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1010         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1011         if (bh) {
1012                 struct logicalVolIntegrityDesc *lvid =
1013                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1014                 struct logicalVolHeaderDesc *lvhd;
1015                 uint64_t uniqueID;
1016                 lvhd = (struct logicalVolHeaderDesc *)
1017                                 lvid->logicalVolContentsUse;
1018                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1019                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1020                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1021                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1022                         uniqueID += 16;
1023                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1024                 mark_buffer_dirty(bh);
1025         }
1026         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1027         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1028                 mark_inode_dirty(dir);
1029         if (fibh.sbh != fibh.ebh)
1030                 brelse(fibh.ebh);
1031         brelse(fibh.sbh);
1032         d_instantiate(dentry, inode);
1033         err = 0;
1034
1035 out:
1036         kfree(name);
1037         unlock_kernel();
1038         return err;
1039
1040 out_no_entry:
1041         inode_dec_link_count(inode);
1042         iput(inode);
1043         goto out;
1044 }
1045
1046 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1047                     struct dentry *dentry)
1048 {
1049         struct inode *inode = old_dentry->d_inode;
1050         struct udf_fileident_bh fibh;
1051         struct fileIdentDesc cfi, *fi;
1052         int err;
1053         struct buffer_head *bh;
1054
1055         lock_kernel();
1056         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1057                 unlock_kernel();
1058                 return -EMLINK;
1059         }
1060
1061         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1062         if (!fi) {
1063                 unlock_kernel();
1064                 return err;
1065         }
1066         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1067         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1068         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1069         if (bh) {
1070                 struct logicalVolIntegrityDesc *lvid =
1071                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1072                 struct logicalVolHeaderDesc *lvhd;
1073                 uint64_t uniqueID;
1074                 lvhd = (struct logicalVolHeaderDesc *)
1075                                 (lvid->logicalVolContentsUse);
1076                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1077                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1078                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1079                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1080                         uniqueID += 16;
1081                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1082                 mark_buffer_dirty(bh);
1083         }
1084         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1085         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1086                 mark_inode_dirty(dir);
1087
1088         if (fibh.sbh != fibh.ebh)
1089                 brelse(fibh.ebh);
1090         brelse(fibh.sbh);
1091         inc_nlink(inode);
1092         inode->i_ctime = current_fs_time(inode->i_sb);
1093         mark_inode_dirty(inode);
1094         atomic_inc(&inode->i_count);
1095         d_instantiate(dentry, inode);
1096         unlock_kernel();
1097
1098         return 0;
1099 }
1100
1101 /* Anybody can rename anything with this: the permission checks are left to the
1102  * higher-level routines.
1103  */
1104 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1105                       struct inode *new_dir, struct dentry *new_dentry)
1106 {
1107         struct inode *old_inode = old_dentry->d_inode;
1108         struct inode *new_inode = new_dentry->d_inode;
1109         struct udf_fileident_bh ofibh, nfibh;
1110         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1111         struct fileIdentDesc ocfi, ncfi;
1112         struct buffer_head *dir_bh = NULL;
1113         int retval = -ENOENT;
1114         struct kernel_lb_addr tloc;
1115         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1116
1117         lock_kernel();
1118         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1119         if (ofi) {
1120                 if (ofibh.sbh != ofibh.ebh)
1121                         brelse(ofibh.ebh);
1122                 brelse(ofibh.sbh);
1123         }
1124         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1125         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1126             != old_inode->i_ino)
1127                 goto end_rename;
1128
1129         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1130         if (nfi) {
1131                 if (!new_inode) {
1132                         if (nfibh.sbh != nfibh.ebh)
1133                                 brelse(nfibh.ebh);
1134                         brelse(nfibh.sbh);
1135                         nfi = NULL;
1136                 }
1137         }
1138         if (S_ISDIR(old_inode->i_mode)) {
1139                 int offset = udf_ext0_offset(old_inode);
1140
1141                 if (new_inode) {
1142                         retval = -ENOTEMPTY;
1143                         if (!empty_dir(new_inode))
1144                                 goto end_rename;
1145                 }
1146                 retval = -EIO;
1147                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1148                         dir_fi = udf_get_fileident(
1149                                         old_iinfo->i_ext.i_data -
1150                                           (old_iinfo->i_efe ?
1151                                            sizeof(struct extendedFileEntry) :
1152                                            sizeof(struct fileEntry)),
1153                                         old_inode->i_sb->s_blocksize, &offset);
1154                 } else {
1155                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1156                         if (!dir_bh)
1157                                 goto end_rename;
1158                         dir_fi = udf_get_fileident(dir_bh->b_data,
1159                                         old_inode->i_sb->s_blocksize, &offset);
1160                 }
1161                 if (!dir_fi)
1162                         goto end_rename;
1163                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1164                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1165                                 old_dir->i_ino)
1166                         goto end_rename;
1167
1168                 retval = -EMLINK;
1169                 if (!new_inode &&
1170                         new_dir->i_nlink >=
1171                                 (256 << sizeof(new_dir->i_nlink)) - 1)
1172                         goto end_rename;
1173         }
1174         if (!nfi) {
1175                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1176                                     &retval);
1177                 if (!nfi)
1178                         goto end_rename;
1179         }
1180
1181         /*
1182          * Like most other Unix systems, set the ctime for inodes on a
1183          * rename.
1184          */
1185         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1186         mark_inode_dirty(old_inode);
1187
1188         /*
1189          * ok, that's it
1190          */
1191         ncfi.fileVersionNum = ocfi.fileVersionNum;
1192         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1193         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1194         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1195
1196         /* The old fid may have moved - find it again */
1197         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1198         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1199
1200         if (new_inode) {
1201                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1202                 inode_dec_link_count(new_inode);
1203         }
1204         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1205         mark_inode_dirty(old_dir);
1206
1207         if (dir_fi) {
1208                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1209                 udf_update_tag((char *)dir_fi,
1210                                 (sizeof(struct fileIdentDesc) +
1211                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1212                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1213                         mark_inode_dirty(old_inode);
1214                 else
1215                         mark_buffer_dirty_inode(dir_bh, old_inode);
1216
1217                 inode_dec_link_count(old_dir);
1218                 if (new_inode)
1219                         inode_dec_link_count(new_inode);
1220                 else {
1221                         inc_nlink(new_dir);
1222                         mark_inode_dirty(new_dir);
1223                 }
1224         }
1225
1226         if (ofi) {
1227                 if (ofibh.sbh != ofibh.ebh)
1228                         brelse(ofibh.ebh);
1229                 brelse(ofibh.sbh);
1230         }
1231
1232         retval = 0;
1233
1234 end_rename:
1235         brelse(dir_bh);
1236         if (nfi) {
1237                 if (nfibh.sbh != nfibh.ebh)
1238                         brelse(nfibh.ebh);
1239                 brelse(nfibh.sbh);
1240         }
1241         unlock_kernel();
1242
1243         return retval;
1244 }
1245
1246 static struct dentry *udf_get_parent(struct dentry *child)
1247 {
1248         struct kernel_lb_addr tloc;
1249         struct inode *inode = NULL;
1250         struct qstr dotdot = {.name = "..", .len = 2};
1251         struct fileIdentDesc cfi;
1252         struct udf_fileident_bh fibh;
1253
1254         lock_kernel();
1255         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1256                 goto out_unlock;
1257
1258         if (fibh.sbh != fibh.ebh)
1259                 brelse(fibh.ebh);
1260         brelse(fibh.sbh);
1261
1262         tloc = lelb_to_cpu(cfi.icb.extLocation);
1263         inode = udf_iget(child->d_inode->i_sb, &tloc);
1264         if (!inode)
1265                 goto out_unlock;
1266         unlock_kernel();
1267
1268         return d_obtain_alias(inode);
1269 out_unlock:
1270         unlock_kernel();
1271         return ERR_PTR(-EACCES);
1272 }
1273
1274
1275 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1276                                         u16 partref, __u32 generation)
1277 {
1278         struct inode *inode;
1279         struct kernel_lb_addr loc;
1280
1281         if (block == 0)
1282                 return ERR_PTR(-ESTALE);
1283
1284         loc.logicalBlockNum = block;
1285         loc.partitionReferenceNum = partref;
1286         inode = udf_iget(sb, &loc);
1287
1288         if (inode == NULL)
1289                 return ERR_PTR(-ENOMEM);
1290
1291         if (generation && inode->i_generation != generation) {
1292                 iput(inode);
1293                 return ERR_PTR(-ESTALE);
1294         }
1295         return d_obtain_alias(inode);
1296 }
1297
1298 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1299                                        struct fid *fid, int fh_len, int fh_type)
1300 {
1301         if ((fh_len != 3 && fh_len != 5) ||
1302             (fh_type != FILEID_UDF_WITH_PARENT &&
1303              fh_type != FILEID_UDF_WITHOUT_PARENT))
1304                 return NULL;
1305
1306         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1307                         fid->udf.generation);
1308 }
1309
1310 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1311                                        struct fid *fid, int fh_len, int fh_type)
1312 {
1313         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1314                 return NULL;
1315
1316         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1317                                  fid->udf.parent_partref,
1318                                  fid->udf.parent_generation);
1319 }
1320 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1321                          int connectable)
1322 {
1323         int len = *lenp;
1324         struct inode *inode =  de->d_inode;
1325         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1326         struct fid *fid = (struct fid *)fh;
1327         int type = FILEID_UDF_WITHOUT_PARENT;
1328
1329         if (len < 3 || (connectable && len < 5))
1330                 return 255;
1331
1332         *lenp = 3;
1333         fid->udf.block = location.logicalBlockNum;
1334         fid->udf.partref = location.partitionReferenceNum;
1335         fid->udf.generation = inode->i_generation;
1336
1337         if (connectable && !S_ISDIR(inode->i_mode)) {
1338                 spin_lock(&de->d_lock);
1339                 inode = de->d_parent->d_inode;
1340                 location = UDF_I(inode)->i_location;
1341                 fid->udf.parent_block = location.logicalBlockNum;
1342                 fid->udf.parent_partref = location.partitionReferenceNum;
1343                 fid->udf.parent_generation = inode->i_generation;
1344                 spin_unlock(&de->d_lock);
1345                 *lenp = 5;
1346                 type = FILEID_UDF_WITH_PARENT;
1347         }
1348
1349         return type;
1350 }
1351
1352 const struct export_operations udf_export_ops = {
1353         .encode_fh      = udf_encode_fh,
1354         .fh_to_dentry   = udf_fh_to_dentry,
1355         .fh_to_parent   = udf_fh_to_parent,
1356         .get_parent     = udf_get_parent,
1357 };
1358
1359 const struct inode_operations udf_dir_inode_operations = {
1360         .lookup                         = udf_lookup,
1361         .create                         = udf_create,
1362         .link                           = udf_link,
1363         .unlink                         = udf_unlink,
1364         .symlink                        = udf_symlink,
1365         .mkdir                          = udf_mkdir,
1366         .rmdir                          = udf_rmdir,
1367         .mknod                          = udf_mknod,
1368         .rename                         = udf_rename,
1369 };