Merge branch 'for-davem' of ssh://master.kernel.org/pub/scm/linux/kernel/git/linville...
[linux-2.6.git] / fs / udf / namei.c
1 /*
2  * namei.c
3  *
4  * PURPOSE
5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
6  *
7  * COPYRIGHT
8  *      This file is distributed under the terms of the GNU General Public
9  *      License (GPL). Copies of the GPL can be obtained from:
10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
11  *      Each contributing author retains all rights to their own work.
12  *
13  *  (C) 1998-2004 Ben Fennema
14  *  (C) 1999-2000 Stelias Computing Inc
15  *
16  * HISTORY
17  *
18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
19  *  04/19/99 blf  link, mknod, symlink support
20  */
21
22 #include "udfdecl.h"
23
24 #include "udf_i.h"
25 #include "udf_sb.h"
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/buffer_head.h>
31 #include <linux/sched.h>
32 #include <linux/crc-itu-t.h>
33 #include <linux/exportfs.h>
34
35 enum { UDF_MAX_LINKS = 0xffff };
36
37 static inline int udf_match(int len1, const unsigned char *name1, int len2,
38                             const unsigned 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                                             const 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         unsigned char *fname = NULL;
153         unsigned 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                         goto out_ok;
234
235                 if (!lfi)
236                         continue;
237
238                 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
239                 if (flen && udf_match(flen, fname, child->len, child->name))
240                         goto out_ok;
241         }
242
243 out_err:
244         fi = NULL;
245         if (fibh->sbh != fibh->ebh)
246                 brelse(fibh->ebh);
247         brelse(fibh->sbh);
248 out_ok:
249         brelse(epos.bh);
250         kfree(fname);
251
252         return fi;
253 }
254
255 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
256                                  struct nameidata *nd)
257 {
258         struct inode *inode = NULL;
259         struct fileIdentDesc cfi;
260         struct udf_fileident_bh fibh;
261
262         if (dentry->d_name.len > UDF_NAME_LEN - 2)
263                 return ERR_PTR(-ENAMETOOLONG);
264
265 #ifdef UDF_RECOVERY
266         /* temporary shorthand for specifying files by inode number */
267         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
268                 struct kernel_lb_addr lb = {
269                         .logicalBlockNum = 0,
270                         .partitionReferenceNum =
271                                 simple_strtoul(dentry->d_name.name + 3,
272                                                 NULL, 0),
273                 };
274                 inode = udf_iget(dir->i_sb, lb);
275                 if (!inode) {
276                         return ERR_PTR(-EACCES);
277                 }
278         } else
279 #endif /* UDF_RECOVERY */
280
281         if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
282                 struct kernel_lb_addr loc;
283
284                 if (fibh.sbh != fibh.ebh)
285                         brelse(fibh.ebh);
286                 brelse(fibh.sbh);
287
288                 loc = lelb_to_cpu(cfi.icb.extLocation);
289                 inode = udf_iget(dir->i_sb, &loc);
290                 if (!inode) {
291                         return ERR_PTR(-EACCES);
292                 }
293         }
294
295         return d_splice_alias(inode, dentry);
296 }
297
298 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
299                                            struct dentry *dentry,
300                                            struct udf_fileident_bh *fibh,
301                                            struct fileIdentDesc *cfi, int *err)
302 {
303         struct super_block *sb = dir->i_sb;
304         struct fileIdentDesc *fi = NULL;
305         unsigned char *name = NULL;
306         int namelen;
307         loff_t f_pos;
308         loff_t size = udf_ext0_offset(dir) + dir->i_size;
309         int nfidlen;
310         uint8_t lfi;
311         uint16_t liu;
312         int block;
313         struct kernel_lb_addr eloc;
314         uint32_t elen = 0;
315         sector_t offset;
316         struct extent_position epos = {};
317         struct udf_inode_info *dinfo;
318
319         fibh->sbh = fibh->ebh = NULL;
320         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
321         if (!name) {
322                 *err = -ENOMEM;
323                 goto out_err;
324         }
325
326         if (dentry) {
327                 if (!dentry->d_name.len) {
328                         *err = -EINVAL;
329                         goto out_err;
330                 }
331                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
332                                                  dentry->d_name.len);
333                 if (!namelen) {
334                         *err = -ENAMETOOLONG;
335                         goto out_err;
336                 }
337         } else {
338                 namelen = 0;
339         }
340
341         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
342
343         f_pos = udf_ext0_offset(dir);
344
345         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
346         dinfo = UDF_I(dir);
347         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
348                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
349                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
350                         block = udf_get_lb_pblock(dir->i_sb,
351                                         &dinfo->i_location, 0);
352                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
353                         goto add;
354                 }
355                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
356                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
357                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
358                                 epos.offset -= sizeof(struct short_ad);
359                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
360                                 epos.offset -= sizeof(struct long_ad);
361                 } else
362                         offset = 0;
363
364                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
365                 if (!fibh->sbh) {
366                         *err = -EIO;
367                         goto out_err;
368                 }
369
370                 block = dinfo->i_location.logicalBlockNum;
371         }
372
373         while (f_pos < size) {
374                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
375                                         &elen, &offset);
376
377                 if (!fi) {
378                         *err = -EIO;
379                         goto out_err;
380                 }
381
382                 liu = le16_to_cpu(cfi->lengthOfImpUse);
383                 lfi = cfi->lengthFileIdent;
384
385                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
386                         if (((sizeof(struct fileIdentDesc) +
387                                         liu + lfi + 3) & ~3) == nfidlen) {
388                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
389                                 cfi->fileVersionNum = cpu_to_le16(1);
390                                 cfi->fileCharacteristics = 0;
391                                 cfi->lengthFileIdent = namelen;
392                                 cfi->lengthOfImpUse = cpu_to_le16(0);
393                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
394                                                   name))
395                                         goto out_ok;
396                                 else {
397                                         *err = -EIO;
398                                         goto out_err;
399                                 }
400                         }
401                 }
402         }
403
404 add:
405         f_pos += nfidlen;
406
407         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
408             sb->s_blocksize - fibh->eoffset < nfidlen) {
409                 brelse(epos.bh);
410                 epos.bh = NULL;
411                 fibh->soffset -= udf_ext0_offset(dir);
412                 fibh->eoffset -= udf_ext0_offset(dir);
413                 f_pos -= udf_ext0_offset(dir);
414                 if (fibh->sbh != fibh->ebh)
415                         brelse(fibh->ebh);
416                 brelse(fibh->sbh);
417                 fibh->sbh = fibh->ebh =
418                                 udf_expand_dir_adinicb(dir, &block, err);
419                 if (!fibh->sbh)
420                         goto out_err;
421                 epos.block = dinfo->i_location;
422                 epos.offset = udf_file_entry_alloc_offset(dir);
423                 /* Load extent udf_expand_dir_adinicb() has created */
424                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
425         }
426
427         /* Entry fits into current block? */
428         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
429                 fibh->soffset = fibh->eoffset;
430                 fibh->eoffset += nfidlen;
431                 if (fibh->sbh != fibh->ebh) {
432                         brelse(fibh->sbh);
433                         fibh->sbh = fibh->ebh;
434                 }
435
436                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
437                         block = dinfo->i_location.logicalBlockNum;
438                         fi = (struct fileIdentDesc *)
439                                         (dinfo->i_ext.i_data +
440                                          fibh->soffset -
441                                          udf_ext0_offset(dir) +
442                                          dinfo->i_lenEAttr);
443                 } else {
444                         block = eloc.logicalBlockNum +
445                                         ((elen - 1) >>
446                                                 dir->i_sb->s_blocksize_bits);
447                         fi = (struct fileIdentDesc *)
448                                 (fibh->sbh->b_data + fibh->soffset);
449                 }
450         } else {
451                 /* Round up last extent in the file */
452                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
453                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
454                         epos.offset -= sizeof(struct short_ad);
455                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
456                         epos.offset -= sizeof(struct long_ad);
457                 udf_write_aext(dir, &epos, &eloc, elen, 1);
458                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
459                                         - 1) & ~(sb->s_blocksize - 1);
460
461                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
462                 fibh->eoffset += nfidlen - sb->s_blocksize;
463                 if (fibh->sbh != fibh->ebh) {
464                         brelse(fibh->sbh);
465                         fibh->sbh = fibh->ebh;
466                 }
467
468                 block = eloc.logicalBlockNum + ((elen - 1) >>
469                                                 dir->i_sb->s_blocksize_bits);
470                 fibh->ebh = udf_bread(dir,
471                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
472                 if (!fibh->ebh)
473                         goto out_err;
474                 /* Extents could have been merged, invalidate our position */
475                 brelse(epos.bh);
476                 epos.bh = NULL;
477                 epos.block = dinfo->i_location;
478                 epos.offset = udf_file_entry_alloc_offset(dir);
479
480                 if (!fibh->soffset) {
481                         /* Find the freshly allocated block */
482                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
483                                 (EXT_RECORDED_ALLOCATED >> 30))
484                                 ;
485                         block = eloc.logicalBlockNum + ((elen - 1) >>
486                                         dir->i_sb->s_blocksize_bits);
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                 else {
512                         /* Find the last extent and truncate it to proper size */
513                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
514                                 (EXT_RECORDED_ALLOCATED >> 30))
515                                 ;
516                         elen -= dinfo->i_lenExtents - dir->i_size;
517                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
518                                 epos.offset -= sizeof(struct short_ad);
519                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
520                                 epos.offset -= sizeof(struct long_ad);
521                         udf_write_aext(dir, &epos, &eloc, elen, 1);
522                         dinfo->i_lenExtents = dir->i_size;
523                 }
524
525                 mark_inode_dirty(dir);
526                 goto out_ok;
527         } else {
528                 *err = -EIO;
529                 goto out_err;
530         }
531
532 out_err:
533         fi = NULL;
534         if (fibh->sbh != fibh->ebh)
535                 brelse(fibh->ebh);
536         brelse(fibh->sbh);
537 out_ok:
538         brelse(epos.bh);
539         kfree(name);
540         return fi;
541 }
542
543 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
544                             struct udf_fileident_bh *fibh,
545                             struct fileIdentDesc *cfi)
546 {
547         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
548
549         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
550                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
551
552         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
553 }
554
555 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
556                       struct nameidata *nd)
557 {
558         struct udf_fileident_bh fibh;
559         struct inode *inode;
560         struct fileIdentDesc cfi, *fi;
561         int err;
562         struct udf_inode_info *iinfo;
563
564         inode = udf_new_inode(dir, mode, &err);
565         if (!inode) {
566                 return err;
567         }
568
569         iinfo = UDF_I(inode);
570         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
571                 inode->i_data.a_ops = &udf_adinicb_aops;
572         else
573                 inode->i_data.a_ops = &udf_aops;
574         inode->i_op = &udf_file_inode_operations;
575         inode->i_fop = &udf_file_operations;
576         mark_inode_dirty(inode);
577
578         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
579         if (!fi) {
580                 inode->i_nlink--;
581                 mark_inode_dirty(inode);
582                 iput(inode);
583                 return err;
584         }
585         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
586         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
587         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
588                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
589         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
590         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
591                 mark_inode_dirty(dir);
592         if (fibh.sbh != fibh.ebh)
593                 brelse(fibh.ebh);
594         brelse(fibh.sbh);
595         d_instantiate(dentry, inode);
596
597         return 0;
598 }
599
600 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
601                      dev_t rdev)
602 {
603         struct inode *inode;
604         struct udf_fileident_bh fibh;
605         struct fileIdentDesc cfi, *fi;
606         int err;
607         struct udf_inode_info *iinfo;
608
609         if (!old_valid_dev(rdev))
610                 return -EINVAL;
611
612         err = -EIO;
613         inode = udf_new_inode(dir, mode, &err);
614         if (!inode)
615                 goto out;
616
617         iinfo = UDF_I(inode);
618         init_special_inode(inode, mode, rdev);
619         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
620         if (!fi) {
621                 inode->i_nlink--;
622                 mark_inode_dirty(inode);
623                 iput(inode);
624                 return err;
625         }
626         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
627         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
628         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
629                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
630         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
631         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
632                 mark_inode_dirty(dir);
633         mark_inode_dirty(inode);
634
635         if (fibh.sbh != fibh.ebh)
636                 brelse(fibh.ebh);
637         brelse(fibh.sbh);
638         d_instantiate(dentry, inode);
639         err = 0;
640
641 out:
642         return err;
643 }
644
645 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
646 {
647         struct inode *inode;
648         struct udf_fileident_bh fibh;
649         struct fileIdentDesc cfi, *fi;
650         int err;
651         struct udf_inode_info *dinfo = UDF_I(dir);
652         struct udf_inode_info *iinfo;
653
654         err = -EMLINK;
655         if (dir->i_nlink >= UDF_MAX_LINKS)
656                 goto out;
657
658         err = -EIO;
659         inode = udf_new_inode(dir, S_IFDIR | mode, &err);
660         if (!inode)
661                 goto out;
662
663         iinfo = UDF_I(inode);
664         inode->i_op = &udf_dir_inode_operations;
665         inode->i_fop = &udf_dir_operations;
666         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
667         if (!fi) {
668                 inode->i_nlink--;
669                 mark_inode_dirty(inode);
670                 iput(inode);
671                 goto out;
672         }
673         inode->i_nlink = 2;
674         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
675         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
676         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
677                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
678         cfi.fileCharacteristics =
679                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
680         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
681         brelse(fibh.sbh);
682         mark_inode_dirty(inode);
683
684         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
685         if (!fi) {
686                 inode->i_nlink = 0;
687                 mark_inode_dirty(inode);
688                 iput(inode);
689                 goto out;
690         }
691         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
692         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
693         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
694                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
695         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
696         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
697         inc_nlink(dir);
698         mark_inode_dirty(dir);
699         d_instantiate(dentry, inode);
700         if (fibh.sbh != fibh.ebh)
701                 brelse(fibh.ebh);
702         brelse(fibh.sbh);
703         err = 0;
704
705 out:
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         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
788         if (!fi)
789                 goto out;
790
791         retval = -EIO;
792         tloc = lelb_to_cpu(cfi.icb.extLocation);
793         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
794                 goto end_rmdir;
795         retval = -ENOTEMPTY;
796         if (!empty_dir(inode))
797                 goto end_rmdir;
798         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
799         if (retval)
800                 goto end_rmdir;
801         if (inode->i_nlink != 2)
802                 udf_warning(inode->i_sb, "udf_rmdir",
803                             "empty directory has nlink != 2 (%d)",
804                             inode->i_nlink);
805         clear_nlink(inode);
806         inode->i_size = 0;
807         inode_dec_link_count(dir);
808         inode->i_ctime = dir->i_ctime = dir->i_mtime =
809                                                 current_fs_time(dir->i_sb);
810         mark_inode_dirty(dir);
811
812 end_rmdir:
813         if (fibh.sbh != fibh.ebh)
814                 brelse(fibh.ebh);
815         brelse(fibh.sbh);
816
817 out:
818         return retval;
819 }
820
821 static int udf_unlink(struct inode *dir, struct dentry *dentry)
822 {
823         int retval;
824         struct inode *inode = dentry->d_inode;
825         struct udf_fileident_bh fibh;
826         struct fileIdentDesc *fi;
827         struct fileIdentDesc cfi;
828         struct kernel_lb_addr tloc;
829
830         retval = -ENOENT;
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         return retval;
861 }
862
863 static int udf_symlink(struct inode *dir, struct dentry *dentry,
864                        const char *symname)
865 {
866         struct inode *inode;
867         struct pathComponent *pc;
868         const char *compstart;
869         struct udf_fileident_bh fibh;
870         struct extent_position epos = {};
871         int eoffset, elen = 0;
872         struct fileIdentDesc *fi;
873         struct fileIdentDesc cfi;
874         uint8_t *ea;
875         int err;
876         int block;
877         unsigned char *name = NULL;
878         int namelen;
879         struct udf_inode_info *iinfo;
880         struct super_block *sb = dir->i_sb;
881
882         inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
883         if (!inode)
884                 goto out;
885
886         iinfo = UDF_I(inode);
887         down_write(&iinfo->i_data_sem);
888         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
889         if (!name) {
890                 err = -ENOMEM;
891                 goto out_no_entry;
892         }
893
894         inode->i_data.a_ops = &udf_symlink_aops;
895         inode->i_op = &udf_symlink_inode_operations;
896
897         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
898                 struct kernel_lb_addr eloc;
899                 uint32_t bsize;
900
901                 block = udf_new_block(sb, inode,
902                                 iinfo->i_location.partitionReferenceNum,
903                                 iinfo->i_location.logicalBlockNum, &err);
904                 if (!block)
905                         goto out_no_entry;
906                 epos.block = iinfo->i_location;
907                 epos.offset = udf_file_entry_alloc_offset(inode);
908                 epos.bh = NULL;
909                 eloc.logicalBlockNum = block;
910                 eloc.partitionReferenceNum =
911                                 iinfo->i_location.partitionReferenceNum;
912                 bsize = sb->s_blocksize;
913                 iinfo->i_lenExtents = bsize;
914                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
915                 brelse(epos.bh);
916
917                 block = udf_get_pblock(sb, block,
918                                 iinfo->i_location.partitionReferenceNum,
919                                 0);
920                 epos.bh = udf_tgetblk(sb, block);
921                 lock_buffer(epos.bh);
922                 memset(epos.bh->b_data, 0x00, bsize);
923                 set_buffer_uptodate(epos.bh);
924                 unlock_buffer(epos.bh);
925                 mark_buffer_dirty_inode(epos.bh, inode);
926                 ea = epos.bh->b_data + udf_ext0_offset(inode);
927         } else
928                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
929
930         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
931         pc = (struct pathComponent *)ea;
932
933         if (*symname == '/') {
934                 do {
935                         symname++;
936                 } while (*symname == '/');
937
938                 pc->componentType = 1;
939                 pc->lengthComponentIdent = 0;
940                 pc->componentFileVersionNum = 0;
941                 elen += sizeof(struct pathComponent);
942         }
943
944         err = -ENAMETOOLONG;
945
946         while (*symname) {
947                 if (elen + sizeof(struct pathComponent) > eoffset)
948                         goto out_no_entry;
949
950                 pc = (struct pathComponent *)(ea + elen);
951
952                 compstart = symname;
953
954                 do {
955                         symname++;
956                 } while (*symname && *symname != '/');
957
958                 pc->componentType = 5;
959                 pc->lengthComponentIdent = 0;
960                 pc->componentFileVersionNum = 0;
961                 if (compstart[0] == '.') {
962                         if ((symname - compstart) == 1)
963                                 pc->componentType = 4;
964                         else if ((symname - compstart) == 2 &&
965                                         compstart[1] == '.')
966                                 pc->componentType = 3;
967                 }
968
969                 if (pc->componentType == 5) {
970                         namelen = udf_put_filename(sb, compstart, name,
971                                                    symname - compstart);
972                         if (!namelen)
973                                 goto out_no_entry;
974
975                         if (elen + sizeof(struct pathComponent) + namelen >
976                                         eoffset)
977                                 goto out_no_entry;
978                         else
979                                 pc->lengthComponentIdent = namelen;
980
981                         memcpy(pc->componentIdent, name, namelen);
982                 }
983
984                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
985
986                 if (*symname) {
987                         do {
988                                 symname++;
989                         } while (*symname == '/');
990                 }
991         }
992
993         brelse(epos.bh);
994         inode->i_size = elen;
995         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
996                 iinfo->i_lenAlloc = inode->i_size;
997         else
998                 udf_truncate_tail_extent(inode);
999         mark_inode_dirty(inode);
1000
1001         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1002         if (!fi)
1003                 goto out_no_entry;
1004         cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1005         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1006         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1007                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1008                         cpu_to_le32(lvid_get_unique_id(sb));
1009         }
1010         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1011         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1012                 mark_inode_dirty(dir);
1013         up_write(&iinfo->i_data_sem);
1014         if (fibh.sbh != fibh.ebh)
1015                 brelse(fibh.ebh);
1016         brelse(fibh.sbh);
1017         d_instantiate(dentry, inode);
1018         err = 0;
1019
1020 out:
1021         kfree(name);
1022         return err;
1023
1024 out_no_entry:
1025         up_write(&iinfo->i_data_sem);
1026         inode_dec_link_count(inode);
1027         iput(inode);
1028         goto out;
1029 }
1030
1031 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1032                     struct dentry *dentry)
1033 {
1034         struct inode *inode = old_dentry->d_inode;
1035         struct udf_fileident_bh fibh;
1036         struct fileIdentDesc cfi, *fi;
1037         int err;
1038
1039         if (inode->i_nlink >= UDF_MAX_LINKS)
1040                 return -EMLINK;
1041
1042         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1043         if (!fi) {
1044                 return err;
1045         }
1046         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1047         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1048         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1049                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1050                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1051         }
1052         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1053         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1054                 mark_inode_dirty(dir);
1055
1056         if (fibh.sbh != fibh.ebh)
1057                 brelse(fibh.ebh);
1058         brelse(fibh.sbh);
1059         inc_nlink(inode);
1060         inode->i_ctime = current_fs_time(inode->i_sb);
1061         mark_inode_dirty(inode);
1062         ihold(inode);
1063         d_instantiate(dentry, inode);
1064
1065         return 0;
1066 }
1067
1068 /* Anybody can rename anything with this: the permission checks are left to the
1069  * higher-level routines.
1070  */
1071 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1072                       struct inode *new_dir, struct dentry *new_dentry)
1073 {
1074         struct inode *old_inode = old_dentry->d_inode;
1075         struct inode *new_inode = new_dentry->d_inode;
1076         struct udf_fileident_bh ofibh, nfibh;
1077         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1078         struct fileIdentDesc ocfi, ncfi;
1079         struct buffer_head *dir_bh = NULL;
1080         int retval = -ENOENT;
1081         struct kernel_lb_addr tloc;
1082         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1083
1084         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1085         if (ofi) {
1086                 if (ofibh.sbh != ofibh.ebh)
1087                         brelse(ofibh.ebh);
1088                 brelse(ofibh.sbh);
1089         }
1090         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1091         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1092             != old_inode->i_ino)
1093                 goto end_rename;
1094
1095         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1096         if (nfi) {
1097                 if (!new_inode) {
1098                         if (nfibh.sbh != nfibh.ebh)
1099                                 brelse(nfibh.ebh);
1100                         brelse(nfibh.sbh);
1101                         nfi = NULL;
1102                 }
1103         }
1104         if (S_ISDIR(old_inode->i_mode)) {
1105                 int offset = udf_ext0_offset(old_inode);
1106
1107                 if (new_inode) {
1108                         retval = -ENOTEMPTY;
1109                         if (!empty_dir(new_inode))
1110                                 goto end_rename;
1111                 }
1112                 retval = -EIO;
1113                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1114                         dir_fi = udf_get_fileident(
1115                                         old_iinfo->i_ext.i_data -
1116                                           (old_iinfo->i_efe ?
1117                                            sizeof(struct extendedFileEntry) :
1118                                            sizeof(struct fileEntry)),
1119                                         old_inode->i_sb->s_blocksize, &offset);
1120                 } else {
1121                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1122                         if (!dir_bh)
1123                                 goto end_rename;
1124                         dir_fi = udf_get_fileident(dir_bh->b_data,
1125                                         old_inode->i_sb->s_blocksize, &offset);
1126                 }
1127                 if (!dir_fi)
1128                         goto end_rename;
1129                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1130                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1131                                 old_dir->i_ino)
1132                         goto end_rename;
1133
1134                 retval = -EMLINK;
1135                 if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
1136                         goto end_rename;
1137         }
1138         if (!nfi) {
1139                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1140                                     &retval);
1141                 if (!nfi)
1142                         goto end_rename;
1143         }
1144
1145         /*
1146          * Like most other Unix systems, set the ctime for inodes on a
1147          * rename.
1148          */
1149         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1150         mark_inode_dirty(old_inode);
1151
1152         /*
1153          * ok, that's it
1154          */
1155         ncfi.fileVersionNum = ocfi.fileVersionNum;
1156         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1157         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1158         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1159
1160         /* The old fid may have moved - find it again */
1161         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1162         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1163
1164         if (new_inode) {
1165                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1166                 inode_dec_link_count(new_inode);
1167         }
1168         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1169         mark_inode_dirty(old_dir);
1170
1171         if (dir_fi) {
1172                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1173                 udf_update_tag((char *)dir_fi,
1174                                 (sizeof(struct fileIdentDesc) +
1175                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1176                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1177                         mark_inode_dirty(old_inode);
1178                 else
1179                         mark_buffer_dirty_inode(dir_bh, old_inode);
1180
1181                 inode_dec_link_count(old_dir);
1182                 if (new_inode)
1183                         inode_dec_link_count(new_inode);
1184                 else {
1185                         inc_nlink(new_dir);
1186                         mark_inode_dirty(new_dir);
1187                 }
1188         }
1189
1190         if (ofi) {
1191                 if (ofibh.sbh != ofibh.ebh)
1192                         brelse(ofibh.ebh);
1193                 brelse(ofibh.sbh);
1194         }
1195
1196         retval = 0;
1197
1198 end_rename:
1199         brelse(dir_bh);
1200         if (nfi) {
1201                 if (nfibh.sbh != nfibh.ebh)
1202                         brelse(nfibh.ebh);
1203                 brelse(nfibh.sbh);
1204         }
1205
1206         return retval;
1207 }
1208
1209 static struct dentry *udf_get_parent(struct dentry *child)
1210 {
1211         struct kernel_lb_addr tloc;
1212         struct inode *inode = NULL;
1213         struct qstr dotdot = {.name = "..", .len = 2};
1214         struct fileIdentDesc cfi;
1215         struct udf_fileident_bh fibh;
1216
1217         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1218                 goto out_unlock;
1219
1220         if (fibh.sbh != fibh.ebh)
1221                 brelse(fibh.ebh);
1222         brelse(fibh.sbh);
1223
1224         tloc = lelb_to_cpu(cfi.icb.extLocation);
1225         inode = udf_iget(child->d_inode->i_sb, &tloc);
1226         if (!inode)
1227                 goto out_unlock;
1228
1229         return d_obtain_alias(inode);
1230 out_unlock:
1231         return ERR_PTR(-EACCES);
1232 }
1233
1234
1235 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1236                                         u16 partref, __u32 generation)
1237 {
1238         struct inode *inode;
1239         struct kernel_lb_addr loc;
1240
1241         if (block == 0)
1242                 return ERR_PTR(-ESTALE);
1243
1244         loc.logicalBlockNum = block;
1245         loc.partitionReferenceNum = partref;
1246         inode = udf_iget(sb, &loc);
1247
1248         if (inode == NULL)
1249                 return ERR_PTR(-ENOMEM);
1250
1251         if (generation && inode->i_generation != generation) {
1252                 iput(inode);
1253                 return ERR_PTR(-ESTALE);
1254         }
1255         return d_obtain_alias(inode);
1256 }
1257
1258 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1259                                        struct fid *fid, int fh_len, int fh_type)
1260 {
1261         if ((fh_len != 3 && fh_len != 5) ||
1262             (fh_type != FILEID_UDF_WITH_PARENT &&
1263              fh_type != FILEID_UDF_WITHOUT_PARENT))
1264                 return NULL;
1265
1266         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1267                         fid->udf.generation);
1268 }
1269
1270 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1271                                        struct fid *fid, int fh_len, int fh_type)
1272 {
1273         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1274                 return NULL;
1275
1276         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1277                                  fid->udf.parent_partref,
1278                                  fid->udf.parent_generation);
1279 }
1280 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1281                          int connectable)
1282 {
1283         int len = *lenp;
1284         struct inode *inode =  de->d_inode;
1285         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1286         struct fid *fid = (struct fid *)fh;
1287         int type = FILEID_UDF_WITHOUT_PARENT;
1288
1289         if (len < 3 || (connectable && len < 5))
1290                 return 255;
1291
1292         *lenp = 3;
1293         fid->udf.block = location.logicalBlockNum;
1294         fid->udf.partref = location.partitionReferenceNum;
1295         fid->udf.generation = inode->i_generation;
1296
1297         if (connectable && !S_ISDIR(inode->i_mode)) {
1298                 spin_lock(&de->d_lock);
1299                 inode = de->d_parent->d_inode;
1300                 location = UDF_I(inode)->i_location;
1301                 fid->udf.parent_block = location.logicalBlockNum;
1302                 fid->udf.parent_partref = location.partitionReferenceNum;
1303                 fid->udf.parent_generation = inode->i_generation;
1304                 spin_unlock(&de->d_lock);
1305                 *lenp = 5;
1306                 type = FILEID_UDF_WITH_PARENT;
1307         }
1308
1309         return type;
1310 }
1311
1312 const struct export_operations udf_export_ops = {
1313         .encode_fh      = udf_encode_fh,
1314         .fh_to_dentry   = udf_fh_to_dentry,
1315         .fh_to_parent   = udf_fh_to_parent,
1316         .get_parent     = udf_get_parent,
1317 };
1318
1319 const struct inode_operations udf_dir_inode_operations = {
1320         .lookup                         = udf_lookup,
1321         .create                         = udf_create,
1322         .link                           = udf_link,
1323         .unlink                         = udf_unlink,
1324         .symlink                        = udf_symlink,
1325         .mkdir                          = udf_mkdir,
1326         .rmdir                          = udf_rmdir,
1327         .mknod                          = udf_mknod,
1328         .rename                         = udf_rename,
1329 };
1330 const struct inode_operations udf_symlink_inode_operations = {
1331         .readlink       = generic_readlink,
1332         .follow_link    = page_follow_link_light,
1333         .put_link       = page_put_link,
1334 };