38de8f234b94966893eeec21d76f6ce63a7b6477
[linux-3.10.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 static inline int udf_match(int len1, const unsigned char *name1, int len2,
36                             const unsigned char *name2)
37 {
38         if (len1 != len2)
39                 return 0;
40
41         return !memcmp(name1, name2, len1);
42 }
43
44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
45                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
46                  uint8_t *impuse, uint8_t *fileident)
47 {
48         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
49         uint16_t crc;
50         int offset;
51         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
52         uint8_t lfi = cfi->lengthFileIdent;
53         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
54                 sizeof(struct fileIdentDesc);
55         int adinicb = 0;
56
57         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
58                 adinicb = 1;
59
60         offset = fibh->soffset + sizeof(struct fileIdentDesc);
61
62         if (impuse) {
63                 if (adinicb || (offset + liu < 0)) {
64                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
65                 } else if (offset >= 0) {
66                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
67                 } else {
68                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
69                         memcpy(fibh->ebh->b_data, impuse - offset,
70                                 liu + offset);
71                 }
72         }
73
74         offset += liu;
75
76         if (fileident) {
77                 if (adinicb || (offset + lfi < 0)) {
78                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
79                 } else if (offset >= 0) {
80                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
81                 } else {
82                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
83                                 -offset);
84                         memcpy(fibh->ebh->b_data, fileident - offset,
85                                 lfi + offset);
86                 }
87         }
88
89         offset += lfi;
90
91         if (adinicb || (offset + padlen < 0)) {
92                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
93         } else if (offset >= 0) {
94                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
95         } else {
96                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
97                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
98         }
99
100         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
101                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
102
103         if (fibh->sbh == fibh->ebh) {
104                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
105                               crclen + sizeof(struct tag) -
106                               sizeof(struct fileIdentDesc));
107         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
108                 crc = crc_itu_t(crc, fibh->ebh->b_data +
109                                         sizeof(struct fileIdentDesc) +
110                                         fibh->soffset,
111                               crclen + sizeof(struct tag) -
112                                         sizeof(struct fileIdentDesc));
113         } else {
114                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
115                               -fibh->soffset - sizeof(struct fileIdentDesc));
116                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
117         }
118
119         cfi->descTag.descCRC = cpu_to_le16(crc);
120         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
121         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
122
123         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
124                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
125                         sizeof(struct fileIdentDesc));
126         } else {
127                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
128                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
129                        sizeof(struct fileIdentDesc) + fibh->soffset);
130         }
131
132         if (adinicb) {
133                 mark_inode_dirty(inode);
134         } else {
135                 if (fibh->sbh != fibh->ebh)
136                         mark_buffer_dirty_inode(fibh->ebh, inode);
137                 mark_buffer_dirty_inode(fibh->sbh, inode);
138         }
139         return 0;
140 }
141
142 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
143                                             const struct qstr *child,
144                                             struct udf_fileident_bh *fibh,
145                                             struct fileIdentDesc *cfi)
146 {
147         struct fileIdentDesc *fi = NULL;
148         loff_t f_pos;
149         int block, flen;
150         unsigned char *fname = NULL;
151         unsigned char *nameptr;
152         uint8_t lfi;
153         uint16_t liu;
154         loff_t size;
155         struct kernel_lb_addr eloc;
156         uint32_t elen;
157         sector_t offset;
158         struct extent_position epos = {};
159         struct udf_inode_info *dinfo = UDF_I(dir);
160         int isdotdot = child->len == 2 &&
161                 child->name[0] == '.' && child->name[1] == '.';
162
163         size = udf_ext0_offset(dir) + dir->i_size;
164         f_pos = udf_ext0_offset(dir);
165
166         fibh->sbh = fibh->ebh = NULL;
167         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
168         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
169                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
170                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
171                         goto out_err;
172                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
173                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
174                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
175                                 epos.offset -= sizeof(struct short_ad);
176                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
177                                 epos.offset -= sizeof(struct long_ad);
178                 } else
179                         offset = 0;
180
181                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
182                 if (!fibh->sbh)
183                         goto out_err;
184         }
185
186         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
187         if (!fname)
188                 goto out_err;
189
190         while (f_pos < size) {
191                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
192                                         &elen, &offset);
193                 if (!fi)
194                         goto out_err;
195
196                 liu = le16_to_cpu(cfi->lengthOfImpUse);
197                 lfi = cfi->lengthFileIdent;
198
199                 if (fibh->sbh == fibh->ebh) {
200                         nameptr = fi->fileIdent + liu;
201                 } else {
202                         int poffset;    /* Unpaded ending offset */
203
204                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
205                                         liu + lfi;
206
207                         if (poffset >= lfi)
208                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
209                                                       poffset - lfi);
210                         else {
211                                 nameptr = fname;
212                                 memcpy(nameptr, fi->fileIdent + liu,
213                                         lfi - poffset);
214                                 memcpy(nameptr + lfi - poffset,
215                                         fibh->ebh->b_data, poffset);
216                         }
217                 }
218
219                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
220                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
221                                 continue;
222                 }
223
224                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
225                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
226                                 continue;
227                 }
228
229                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
230                     isdotdot)
231                         goto out_ok;
232
233                 if (!lfi)
234                         continue;
235
236                 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
237                 if (flen && udf_match(flen, fname, child->len, child->name))
238                         goto out_ok;
239         }
240
241 out_err:
242         fi = NULL;
243         if (fibh->sbh != fibh->ebh)
244                 brelse(fibh->ebh);
245         brelse(fibh->sbh);
246 out_ok:
247         brelse(epos.bh);
248         kfree(fname);
249
250         return fi;
251 }
252
253 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
254                                  struct nameidata *nd)
255 {
256         struct inode *inode = NULL;
257         struct fileIdentDesc cfi;
258         struct udf_fileident_bh fibh;
259
260         if (dentry->d_name.len > UDF_NAME_LEN - 2)
261                 return ERR_PTR(-ENAMETOOLONG);
262
263 #ifdef UDF_RECOVERY
264         /* temporary shorthand for specifying files by inode number */
265         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
266                 struct kernel_lb_addr lb = {
267                         .logicalBlockNum = 0,
268                         .partitionReferenceNum =
269                                 simple_strtoul(dentry->d_name.name + 3,
270                                                 NULL, 0),
271                 };
272                 inode = udf_iget(dir->i_sb, lb);
273                 if (!inode) {
274                         return ERR_PTR(-EACCES);
275                 }
276         } else
277 #endif /* UDF_RECOVERY */
278
279         if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
280                 struct kernel_lb_addr loc;
281
282                 if (fibh.sbh != fibh.ebh)
283                         brelse(fibh.ebh);
284                 brelse(fibh.sbh);
285
286                 loc = lelb_to_cpu(cfi.icb.extLocation);
287                 inode = udf_iget(dir->i_sb, &loc);
288                 if (!inode) {
289                         return ERR_PTR(-EACCES);
290                 }
291         }
292
293         return d_splice_alias(inode, dentry);
294 }
295
296 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
297                                            struct dentry *dentry,
298                                            struct udf_fileident_bh *fibh,
299                                            struct fileIdentDesc *cfi, int *err)
300 {
301         struct super_block *sb = dir->i_sb;
302         struct fileIdentDesc *fi = NULL;
303         unsigned char *name = NULL;
304         int namelen;
305         loff_t f_pos;
306         loff_t size = udf_ext0_offset(dir) + dir->i_size;
307         int nfidlen;
308         uint8_t lfi;
309         uint16_t liu;
310         int block;
311         struct kernel_lb_addr eloc;
312         uint32_t elen = 0;
313         sector_t offset;
314         struct extent_position epos = {};
315         struct udf_inode_info *dinfo;
316
317         fibh->sbh = fibh->ebh = NULL;
318         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
319         if (!name) {
320                 *err = -ENOMEM;
321                 goto out_err;
322         }
323
324         if (dentry) {
325                 if (!dentry->d_name.len) {
326                         *err = -EINVAL;
327                         goto out_err;
328                 }
329                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
330                                                  dentry->d_name.len);
331                 if (!namelen) {
332                         *err = -ENAMETOOLONG;
333                         goto out_err;
334                 }
335         } else {
336                 namelen = 0;
337         }
338
339         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
340
341         f_pos = udf_ext0_offset(dir);
342
343         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
344         dinfo = UDF_I(dir);
345         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
346                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
347                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
348                         block = udf_get_lb_pblock(dir->i_sb,
349                                         &dinfo->i_location, 0);
350                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
351                         goto add;
352                 }
353                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
354                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
355                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
356                                 epos.offset -= sizeof(struct short_ad);
357                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
358                                 epos.offset -= sizeof(struct long_ad);
359                 } else
360                         offset = 0;
361
362                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
363                 if (!fibh->sbh) {
364                         *err = -EIO;
365                         goto out_err;
366                 }
367
368                 block = dinfo->i_location.logicalBlockNum;
369         }
370
371         while (f_pos < size) {
372                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
373                                         &elen, &offset);
374
375                 if (!fi) {
376                         *err = -EIO;
377                         goto out_err;
378                 }
379
380                 liu = le16_to_cpu(cfi->lengthOfImpUse);
381                 lfi = cfi->lengthFileIdent;
382
383                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
384                         if (((sizeof(struct fileIdentDesc) +
385                                         liu + lfi + 3) & ~3) == nfidlen) {
386                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
387                                 cfi->fileVersionNum = cpu_to_le16(1);
388                                 cfi->fileCharacteristics = 0;
389                                 cfi->lengthFileIdent = namelen;
390                                 cfi->lengthOfImpUse = cpu_to_le16(0);
391                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
392                                                   name))
393                                         goto out_ok;
394                                 else {
395                                         *err = -EIO;
396                                         goto out_err;
397                                 }
398                         }
399                 }
400         }
401
402 add:
403         f_pos += nfidlen;
404
405         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
406             sb->s_blocksize - fibh->eoffset < nfidlen) {
407                 brelse(epos.bh);
408                 epos.bh = NULL;
409                 fibh->soffset -= udf_ext0_offset(dir);
410                 fibh->eoffset -= udf_ext0_offset(dir);
411                 f_pos -= udf_ext0_offset(dir);
412                 if (fibh->sbh != fibh->ebh)
413                         brelse(fibh->ebh);
414                 brelse(fibh->sbh);
415                 fibh->sbh = fibh->ebh =
416                                 udf_expand_dir_adinicb(dir, &block, err);
417                 if (!fibh->sbh)
418                         goto out_err;
419                 epos.block = dinfo->i_location;
420                 epos.offset = udf_file_entry_alloc_offset(dir);
421                 /* Load extent udf_expand_dir_adinicb() has created */
422                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
423         }
424
425         /* Entry fits into current block? */
426         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
427                 fibh->soffset = fibh->eoffset;
428                 fibh->eoffset += nfidlen;
429                 if (fibh->sbh != fibh->ebh) {
430                         brelse(fibh->sbh);
431                         fibh->sbh = fibh->ebh;
432                 }
433
434                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
435                         block = dinfo->i_location.logicalBlockNum;
436                         fi = (struct fileIdentDesc *)
437                                         (dinfo->i_ext.i_data +
438                                          fibh->soffset -
439                                          udf_ext0_offset(dir) +
440                                          dinfo->i_lenEAttr);
441                 } else {
442                         block = eloc.logicalBlockNum +
443                                         ((elen - 1) >>
444                                                 dir->i_sb->s_blocksize_bits);
445                         fi = (struct fileIdentDesc *)
446                                 (fibh->sbh->b_data + fibh->soffset);
447                 }
448         } else {
449                 /* Round up last extent in the file */
450                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
451                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
452                         epos.offset -= sizeof(struct short_ad);
453                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
454                         epos.offset -= sizeof(struct long_ad);
455                 udf_write_aext(dir, &epos, &eloc, elen, 1);
456                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
457                                         - 1) & ~(sb->s_blocksize - 1);
458
459                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
460                 fibh->eoffset += nfidlen - sb->s_blocksize;
461                 if (fibh->sbh != fibh->ebh) {
462                         brelse(fibh->sbh);
463                         fibh->sbh = fibh->ebh;
464                 }
465
466                 block = eloc.logicalBlockNum + ((elen - 1) >>
467                                                 dir->i_sb->s_blocksize_bits);
468                 fibh->ebh = udf_bread(dir,
469                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
470                 if (!fibh->ebh)
471                         goto out_err;
472                 /* Extents could have been merged, invalidate our position */
473                 brelse(epos.bh);
474                 epos.bh = NULL;
475                 epos.block = dinfo->i_location;
476                 epos.offset = udf_file_entry_alloc_offset(dir);
477
478                 if (!fibh->soffset) {
479                         /* Find the freshly allocated block */
480                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
481                                 (EXT_RECORDED_ALLOCATED >> 30))
482                                 ;
483                         block = eloc.logicalBlockNum + ((elen - 1) >>
484                                         dir->i_sb->s_blocksize_bits);
485                         brelse(fibh->sbh);
486                         fibh->sbh = fibh->ebh;
487                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
488                 } else {
489                         fi = (struct fileIdentDesc *)
490                                 (fibh->sbh->b_data + sb->s_blocksize +
491                                         fibh->soffset);
492                 }
493         }
494
495         memset(cfi, 0, sizeof(struct fileIdentDesc));
496         if (UDF_SB(sb)->s_udfrev >= 0x0200)
497                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
498                             sizeof(struct tag));
499         else
500                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
501                             sizeof(struct tag));
502         cfi->fileVersionNum = cpu_to_le16(1);
503         cfi->lengthFileIdent = namelen;
504         cfi->lengthOfImpUse = cpu_to_le16(0);
505         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
506                 dir->i_size += nfidlen;
507                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
508                         dinfo->i_lenAlloc += nfidlen;
509                 else {
510                         /* Find the last extent and truncate it to proper size */
511                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
512                                 (EXT_RECORDED_ALLOCATED >> 30))
513                                 ;
514                         elen -= dinfo->i_lenExtents - dir->i_size;
515                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
516                                 epos.offset -= sizeof(struct short_ad);
517                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
518                                 epos.offset -= sizeof(struct long_ad);
519                         udf_write_aext(dir, &epos, &eloc, elen, 1);
520                         dinfo->i_lenExtents = dir->i_size;
521                 }
522
523                 mark_inode_dirty(dir);
524                 goto out_ok;
525         } else {
526                 *err = -EIO;
527                 goto out_err;
528         }
529
530 out_err:
531         fi = NULL;
532         if (fibh->sbh != fibh->ebh)
533                 brelse(fibh->ebh);
534         brelse(fibh->sbh);
535 out_ok:
536         brelse(epos.bh);
537         kfree(name);
538         return fi;
539 }
540
541 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
542                             struct udf_fileident_bh *fibh,
543                             struct fileIdentDesc *cfi)
544 {
545         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
546
547         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
548                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
549
550         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
551 }
552
553 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
554                       struct nameidata *nd)
555 {
556         struct udf_fileident_bh fibh;
557         struct inode *inode;
558         struct fileIdentDesc cfi, *fi;
559         int err;
560         struct udf_inode_info *iinfo;
561
562         inode = udf_new_inode(dir, mode, &err);
563         if (!inode) {
564                 return err;
565         }
566
567         iinfo = UDF_I(inode);
568         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
569                 inode->i_data.a_ops = &udf_adinicb_aops;
570         else
571                 inode->i_data.a_ops = &udf_aops;
572         inode->i_op = &udf_file_inode_operations;
573         inode->i_fop = &udf_file_operations;
574         mark_inode_dirty(inode);
575
576         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
577         if (!fi) {
578                 inode_dec_link_count(inode);
579                 iput(inode);
580                 return err;
581         }
582         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
583         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
584         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
585                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
586         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
587         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
588                 mark_inode_dirty(dir);
589         if (fibh.sbh != fibh.ebh)
590                 brelse(fibh.ebh);
591         brelse(fibh.sbh);
592         d_instantiate(dentry, inode);
593
594         return 0;
595 }
596
597 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
598                      dev_t rdev)
599 {
600         struct inode *inode;
601         struct udf_fileident_bh fibh;
602         struct fileIdentDesc cfi, *fi;
603         int err;
604         struct udf_inode_info *iinfo;
605
606         if (!old_valid_dev(rdev))
607                 return -EINVAL;
608
609         err = -EIO;
610         inode = udf_new_inode(dir, mode, &err);
611         if (!inode)
612                 goto out;
613
614         iinfo = UDF_I(inode);
615         init_special_inode(inode, mode, rdev);
616         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
617         if (!fi) {
618                 inode_dec_link_count(inode);
619                 iput(inode);
620                 return err;
621         }
622         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
623         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
624         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
625                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
626         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
627         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
628                 mark_inode_dirty(dir);
629         mark_inode_dirty(inode);
630
631         if (fibh.sbh != fibh.ebh)
632                 brelse(fibh.ebh);
633         brelse(fibh.sbh);
634         d_instantiate(dentry, inode);
635         err = 0;
636
637 out:
638         return err;
639 }
640
641 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
642 {
643         struct inode *inode;
644         struct udf_fileident_bh fibh;
645         struct fileIdentDesc cfi, *fi;
646         int err;
647         struct udf_inode_info *dinfo = UDF_I(dir);
648         struct udf_inode_info *iinfo;
649
650         err = -EIO;
651         inode = udf_new_inode(dir, S_IFDIR | mode, &err);
652         if (!inode)
653                 goto out;
654
655         iinfo = UDF_I(inode);
656         inode->i_op = &udf_dir_inode_operations;
657         inode->i_fop = &udf_dir_operations;
658         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
659         if (!fi) {
660                 inode_dec_link_count(inode);
661                 iput(inode);
662                 goto out;
663         }
664         set_nlink(inode, 2);
665         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
666         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
667         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
668                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
669         cfi.fileCharacteristics =
670                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
671         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
672         brelse(fibh.sbh);
673         mark_inode_dirty(inode);
674
675         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
676         if (!fi) {
677                 clear_nlink(inode);
678                 mark_inode_dirty(inode);
679                 iput(inode);
680                 goto out;
681         }
682         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
683         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
684         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
685                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
686         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
687         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
688         inc_nlink(dir);
689         mark_inode_dirty(dir);
690         d_instantiate(dentry, inode);
691         if (fibh.sbh != fibh.ebh)
692                 brelse(fibh.ebh);
693         brelse(fibh.sbh);
694         err = 0;
695
696 out:
697         return err;
698 }
699
700 static int empty_dir(struct inode *dir)
701 {
702         struct fileIdentDesc *fi, cfi;
703         struct udf_fileident_bh fibh;
704         loff_t f_pos;
705         loff_t size = udf_ext0_offset(dir) + dir->i_size;
706         int block;
707         struct kernel_lb_addr eloc;
708         uint32_t elen;
709         sector_t offset;
710         struct extent_position epos = {};
711         struct udf_inode_info *dinfo = UDF_I(dir);
712
713         f_pos = udf_ext0_offset(dir);
714         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
715
716         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
717                 fibh.sbh = fibh.ebh = NULL;
718         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
719                               &epos, &eloc, &elen, &offset) ==
720                                         (EXT_RECORDED_ALLOCATED >> 30)) {
721                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
722                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
723                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
724                                 epos.offset -= sizeof(struct short_ad);
725                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
726                                 epos.offset -= sizeof(struct long_ad);
727                 } else
728                         offset = 0;
729
730                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
731                 if (!fibh.sbh) {
732                         brelse(epos.bh);
733                         return 0;
734                 }
735         } else {
736                 brelse(epos.bh);
737                 return 0;
738         }
739
740         while (f_pos < size) {
741                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
742                                         &elen, &offset);
743                 if (!fi) {
744                         if (fibh.sbh != fibh.ebh)
745                                 brelse(fibh.ebh);
746                         brelse(fibh.sbh);
747                         brelse(epos.bh);
748                         return 0;
749                 }
750
751                 if (cfi.lengthFileIdent &&
752                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
753                         if (fibh.sbh != fibh.ebh)
754                                 brelse(fibh.ebh);
755                         brelse(fibh.sbh);
756                         brelse(epos.bh);
757                         return 0;
758                 }
759         }
760
761         if (fibh.sbh != fibh.ebh)
762                 brelse(fibh.ebh);
763         brelse(fibh.sbh);
764         brelse(epos.bh);
765
766         return 1;
767 }
768
769 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
770 {
771         int retval;
772         struct inode *inode = dentry->d_inode;
773         struct udf_fileident_bh fibh;
774         struct fileIdentDesc *fi, cfi;
775         struct kernel_lb_addr tloc;
776
777         retval = -ENOENT;
778         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
779         if (!fi)
780                 goto out;
781
782         retval = -EIO;
783         tloc = lelb_to_cpu(cfi.icb.extLocation);
784         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
785                 goto end_rmdir;
786         retval = -ENOTEMPTY;
787         if (!empty_dir(inode))
788                 goto end_rmdir;
789         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
790         if (retval)
791                 goto end_rmdir;
792         if (inode->i_nlink != 2)
793                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
794                          inode->i_nlink);
795         clear_nlink(inode);
796         inode->i_size = 0;
797         inode_dec_link_count(dir);
798         inode->i_ctime = dir->i_ctime = dir->i_mtime =
799                                                 current_fs_time(dir->i_sb);
800         mark_inode_dirty(dir);
801
802 end_rmdir:
803         if (fibh.sbh != fibh.ebh)
804                 brelse(fibh.ebh);
805         brelse(fibh.sbh);
806
807 out:
808         return retval;
809 }
810
811 static int udf_unlink(struct inode *dir, struct dentry *dentry)
812 {
813         int retval;
814         struct inode *inode = dentry->d_inode;
815         struct udf_fileident_bh fibh;
816         struct fileIdentDesc *fi;
817         struct fileIdentDesc cfi;
818         struct kernel_lb_addr tloc;
819
820         retval = -ENOENT;
821         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
822         if (!fi)
823                 goto out;
824
825         retval = -EIO;
826         tloc = lelb_to_cpu(cfi.icb.extLocation);
827         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
828                 goto end_unlink;
829
830         if (!inode->i_nlink) {
831                 udf_debug("Deleting nonexistent file (%lu), %d\n",
832                           inode->i_ino, inode->i_nlink);
833                 set_nlink(inode, 1);
834         }
835         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
836         if (retval)
837                 goto end_unlink;
838         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
839         mark_inode_dirty(dir);
840         inode_dec_link_count(inode);
841         inode->i_ctime = dir->i_ctime;
842         retval = 0;
843
844 end_unlink:
845         if (fibh.sbh != fibh.ebh)
846                 brelse(fibh.ebh);
847         brelse(fibh.sbh);
848
849 out:
850         return retval;
851 }
852
853 static int udf_symlink(struct inode *dir, struct dentry *dentry,
854                        const char *symname)
855 {
856         struct inode *inode;
857         struct pathComponent *pc;
858         const char *compstart;
859         struct udf_fileident_bh fibh;
860         struct extent_position epos = {};
861         int eoffset, elen = 0;
862         struct fileIdentDesc *fi;
863         struct fileIdentDesc cfi;
864         uint8_t *ea;
865         int err;
866         int block;
867         unsigned char *name = NULL;
868         int namelen;
869         struct udf_inode_info *iinfo;
870         struct super_block *sb = dir->i_sb;
871
872         inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
873         if (!inode)
874                 goto out;
875
876         iinfo = UDF_I(inode);
877         down_write(&iinfo->i_data_sem);
878         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
879         if (!name) {
880                 err = -ENOMEM;
881                 goto out_no_entry;
882         }
883
884         inode->i_data.a_ops = &udf_symlink_aops;
885         inode->i_op = &udf_symlink_inode_operations;
886
887         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
888                 struct kernel_lb_addr eloc;
889                 uint32_t bsize;
890
891                 block = udf_new_block(sb, inode,
892                                 iinfo->i_location.partitionReferenceNum,
893                                 iinfo->i_location.logicalBlockNum, &err);
894                 if (!block)
895                         goto out_no_entry;
896                 epos.block = iinfo->i_location;
897                 epos.offset = udf_file_entry_alloc_offset(inode);
898                 epos.bh = NULL;
899                 eloc.logicalBlockNum = block;
900                 eloc.partitionReferenceNum =
901                                 iinfo->i_location.partitionReferenceNum;
902                 bsize = sb->s_blocksize;
903                 iinfo->i_lenExtents = bsize;
904                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
905                 brelse(epos.bh);
906
907                 block = udf_get_pblock(sb, block,
908                                 iinfo->i_location.partitionReferenceNum,
909                                 0);
910                 epos.bh = udf_tgetblk(sb, block);
911                 lock_buffer(epos.bh);
912                 memset(epos.bh->b_data, 0x00, bsize);
913                 set_buffer_uptodate(epos.bh);
914                 unlock_buffer(epos.bh);
915                 mark_buffer_dirty_inode(epos.bh, inode);
916                 ea = epos.bh->b_data + udf_ext0_offset(inode);
917         } else
918                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
919
920         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
921         pc = (struct pathComponent *)ea;
922
923         if (*symname == '/') {
924                 do {
925                         symname++;
926                 } while (*symname == '/');
927
928                 pc->componentType = 1;
929                 pc->lengthComponentIdent = 0;
930                 pc->componentFileVersionNum = 0;
931                 elen += sizeof(struct pathComponent);
932         }
933
934         err = -ENAMETOOLONG;
935
936         while (*symname) {
937                 if (elen + sizeof(struct pathComponent) > eoffset)
938                         goto out_no_entry;
939
940                 pc = (struct pathComponent *)(ea + elen);
941
942                 compstart = symname;
943
944                 do {
945                         symname++;
946                 } while (*symname && *symname != '/');
947
948                 pc->componentType = 5;
949                 pc->lengthComponentIdent = 0;
950                 pc->componentFileVersionNum = 0;
951                 if (compstart[0] == '.') {
952                         if ((symname - compstart) == 1)
953                                 pc->componentType = 4;
954                         else if ((symname - compstart) == 2 &&
955                                         compstart[1] == '.')
956                                 pc->componentType = 3;
957                 }
958
959                 if (pc->componentType == 5) {
960                         namelen = udf_put_filename(sb, compstart, name,
961                                                    symname - compstart);
962                         if (!namelen)
963                                 goto out_no_entry;
964
965                         if (elen + sizeof(struct pathComponent) + namelen >
966                                         eoffset)
967                                 goto out_no_entry;
968                         else
969                                 pc->lengthComponentIdent = namelen;
970
971                         memcpy(pc->componentIdent, name, namelen);
972                 }
973
974                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
975
976                 if (*symname) {
977                         do {
978                                 symname++;
979                         } while (*symname == '/');
980                 }
981         }
982
983         brelse(epos.bh);
984         inode->i_size = elen;
985         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
986                 iinfo->i_lenAlloc = inode->i_size;
987         else
988                 udf_truncate_tail_extent(inode);
989         mark_inode_dirty(inode);
990
991         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
992         if (!fi)
993                 goto out_no_entry;
994         cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
995         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
996         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
997                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
998                         cpu_to_le32(lvid_get_unique_id(sb));
999         }
1000         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1001         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1002                 mark_inode_dirty(dir);
1003         up_write(&iinfo->i_data_sem);
1004         if (fibh.sbh != fibh.ebh)
1005                 brelse(fibh.ebh);
1006         brelse(fibh.sbh);
1007         d_instantiate(dentry, inode);
1008         err = 0;
1009
1010 out:
1011         kfree(name);
1012         return err;
1013
1014 out_no_entry:
1015         up_write(&iinfo->i_data_sem);
1016         inode_dec_link_count(inode);
1017         iput(inode);
1018         goto out;
1019 }
1020
1021 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1022                     struct dentry *dentry)
1023 {
1024         struct inode *inode = old_dentry->d_inode;
1025         struct udf_fileident_bh fibh;
1026         struct fileIdentDesc cfi, *fi;
1027         int err;
1028
1029         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1030         if (!fi) {
1031                 return err;
1032         }
1033         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1034         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1035         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1036                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1037                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1038         }
1039         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1040         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1041                 mark_inode_dirty(dir);
1042
1043         if (fibh.sbh != fibh.ebh)
1044                 brelse(fibh.ebh);
1045         brelse(fibh.sbh);
1046         inc_nlink(inode);
1047         inode->i_ctime = current_fs_time(inode->i_sb);
1048         mark_inode_dirty(inode);
1049         ihold(inode);
1050         d_instantiate(dentry, inode);
1051
1052         return 0;
1053 }
1054
1055 /* Anybody can rename anything with this: the permission checks are left to the
1056  * higher-level routines.
1057  */
1058 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1059                       struct inode *new_dir, struct dentry *new_dentry)
1060 {
1061         struct inode *old_inode = old_dentry->d_inode;
1062         struct inode *new_inode = new_dentry->d_inode;
1063         struct udf_fileident_bh ofibh, nfibh;
1064         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1065         struct fileIdentDesc ocfi, ncfi;
1066         struct buffer_head *dir_bh = NULL;
1067         int retval = -ENOENT;
1068         struct kernel_lb_addr tloc;
1069         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1070
1071         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1072         if (ofi) {
1073                 if (ofibh.sbh != ofibh.ebh)
1074                         brelse(ofibh.ebh);
1075                 brelse(ofibh.sbh);
1076         }
1077         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1078         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1079             != old_inode->i_ino)
1080                 goto end_rename;
1081
1082         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1083         if (nfi) {
1084                 if (!new_inode) {
1085                         if (nfibh.sbh != nfibh.ebh)
1086                                 brelse(nfibh.ebh);
1087                         brelse(nfibh.sbh);
1088                         nfi = NULL;
1089                 }
1090         }
1091         if (S_ISDIR(old_inode->i_mode)) {
1092                 int offset = udf_ext0_offset(old_inode);
1093
1094                 if (new_inode) {
1095                         retval = -ENOTEMPTY;
1096                         if (!empty_dir(new_inode))
1097                                 goto end_rename;
1098                 }
1099                 retval = -EIO;
1100                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1101                         dir_fi = udf_get_fileident(
1102                                         old_iinfo->i_ext.i_data -
1103                                           (old_iinfo->i_efe ?
1104                                            sizeof(struct extendedFileEntry) :
1105                                            sizeof(struct fileEntry)),
1106                                         old_inode->i_sb->s_blocksize, &offset);
1107                 } else {
1108                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1109                         if (!dir_bh)
1110                                 goto end_rename;
1111                         dir_fi = udf_get_fileident(dir_bh->b_data,
1112                                         old_inode->i_sb->s_blocksize, &offset);
1113                 }
1114                 if (!dir_fi)
1115                         goto end_rename;
1116                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1117                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1118                                 old_dir->i_ino)
1119                         goto end_rename;
1120         }
1121         if (!nfi) {
1122                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1123                                     &retval);
1124                 if (!nfi)
1125                         goto end_rename;
1126         }
1127
1128         /*
1129          * Like most other Unix systems, set the ctime for inodes on a
1130          * rename.
1131          */
1132         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1133         mark_inode_dirty(old_inode);
1134
1135         /*
1136          * ok, that's it
1137          */
1138         ncfi.fileVersionNum = ocfi.fileVersionNum;
1139         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1140         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1141         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1142
1143         /* The old fid may have moved - find it again */
1144         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1145         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1146
1147         if (new_inode) {
1148                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1149                 inode_dec_link_count(new_inode);
1150         }
1151         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1152         mark_inode_dirty(old_dir);
1153
1154         if (dir_fi) {
1155                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1156                 udf_update_tag((char *)dir_fi,
1157                                 (sizeof(struct fileIdentDesc) +
1158                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1159                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1160                         mark_inode_dirty(old_inode);
1161                 else
1162                         mark_buffer_dirty_inode(dir_bh, old_inode);
1163
1164                 inode_dec_link_count(old_dir);
1165                 if (new_inode)
1166                         inode_dec_link_count(new_inode);
1167                 else {
1168                         inc_nlink(new_dir);
1169                         mark_inode_dirty(new_dir);
1170                 }
1171         }
1172
1173         if (ofi) {
1174                 if (ofibh.sbh != ofibh.ebh)
1175                         brelse(ofibh.ebh);
1176                 brelse(ofibh.sbh);
1177         }
1178
1179         retval = 0;
1180
1181 end_rename:
1182         brelse(dir_bh);
1183         if (nfi) {
1184                 if (nfibh.sbh != nfibh.ebh)
1185                         brelse(nfibh.ebh);
1186                 brelse(nfibh.sbh);
1187         }
1188
1189         return retval;
1190 }
1191
1192 static struct dentry *udf_get_parent(struct dentry *child)
1193 {
1194         struct kernel_lb_addr tloc;
1195         struct inode *inode = NULL;
1196         struct qstr dotdot = {.name = "..", .len = 2};
1197         struct fileIdentDesc cfi;
1198         struct udf_fileident_bh fibh;
1199
1200         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1201                 goto out_unlock;
1202
1203         if (fibh.sbh != fibh.ebh)
1204                 brelse(fibh.ebh);
1205         brelse(fibh.sbh);
1206
1207         tloc = lelb_to_cpu(cfi.icb.extLocation);
1208         inode = udf_iget(child->d_inode->i_sb, &tloc);
1209         if (!inode)
1210                 goto out_unlock;
1211
1212         return d_obtain_alias(inode);
1213 out_unlock:
1214         return ERR_PTR(-EACCES);
1215 }
1216
1217
1218 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1219                                         u16 partref, __u32 generation)
1220 {
1221         struct inode *inode;
1222         struct kernel_lb_addr loc;
1223
1224         if (block == 0)
1225                 return ERR_PTR(-ESTALE);
1226
1227         loc.logicalBlockNum = block;
1228         loc.partitionReferenceNum = partref;
1229         inode = udf_iget(sb, &loc);
1230
1231         if (inode == NULL)
1232                 return ERR_PTR(-ENOMEM);
1233
1234         if (generation && inode->i_generation != generation) {
1235                 iput(inode);
1236                 return ERR_PTR(-ESTALE);
1237         }
1238         return d_obtain_alias(inode);
1239 }
1240
1241 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1242                                        struct fid *fid, int fh_len, int fh_type)
1243 {
1244         if ((fh_len != 3 && fh_len != 5) ||
1245             (fh_type != FILEID_UDF_WITH_PARENT &&
1246              fh_type != FILEID_UDF_WITHOUT_PARENT))
1247                 return NULL;
1248
1249         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1250                         fid->udf.generation);
1251 }
1252
1253 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1254                                        struct fid *fid, int fh_len, int fh_type)
1255 {
1256         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1257                 return NULL;
1258
1259         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1260                                  fid->udf.parent_partref,
1261                                  fid->udf.parent_generation);
1262 }
1263 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1264                          int connectable)
1265 {
1266         int len = *lenp;
1267         struct inode *inode =  de->d_inode;
1268         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1269         struct fid *fid = (struct fid *)fh;
1270         int type = FILEID_UDF_WITHOUT_PARENT;
1271
1272         if (connectable && (len < 5)) {
1273                 *lenp = 5;
1274                 return 255;
1275         } else if (len < 3) {
1276                 *lenp = 3;
1277                 return 255;
1278         }
1279
1280         *lenp = 3;
1281         fid->udf.block = location.logicalBlockNum;
1282         fid->udf.partref = location.partitionReferenceNum;
1283         fid->udf.generation = inode->i_generation;
1284
1285         if (connectable && !S_ISDIR(inode->i_mode)) {
1286                 spin_lock(&de->d_lock);
1287                 inode = de->d_parent->d_inode;
1288                 location = UDF_I(inode)->i_location;
1289                 fid->udf.parent_block = location.logicalBlockNum;
1290                 fid->udf.parent_partref = location.partitionReferenceNum;
1291                 fid->udf.parent_generation = inode->i_generation;
1292                 spin_unlock(&de->d_lock);
1293                 *lenp = 5;
1294                 type = FILEID_UDF_WITH_PARENT;
1295         }
1296
1297         return type;
1298 }
1299
1300 const struct export_operations udf_export_ops = {
1301         .encode_fh      = udf_encode_fh,
1302         .fh_to_dentry   = udf_fh_to_dentry,
1303         .fh_to_parent   = udf_fh_to_parent,
1304         .get_parent     = udf_get_parent,
1305 };
1306
1307 const struct inode_operations udf_dir_inode_operations = {
1308         .lookup                         = udf_lookup,
1309         .create                         = udf_create,
1310         .link                           = udf_link,
1311         .unlink                         = udf_unlink,
1312         .symlink                        = udf_symlink,
1313         .mkdir                          = udf_mkdir,
1314         .rmdir                          = udf_rmdir,
1315         .mknod                          = udf_mknod,
1316         .rename                         = udf_rename,
1317 };
1318 const struct inode_operations udf_symlink_inode_operations = {
1319         .readlink       = generic_readlink,
1320         .follow_link    = page_follow_link_light,
1321         .put_link       = page_put_link,
1322 };