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TOMOYO Linux Cross Reference
Linux/fs/udf/namei.c

Version: ~ [ linux-5.17-rc1 ] ~ [ linux-5.16.2 ] ~ [ linux-5.15.16 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.93 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.173 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.225 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.262 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.297 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.299 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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, lfi, fname,
237                                         UDF_NAME_LEN);
238                 if (flen && udf_match(flen, fname, child->len, child->name))
239                         goto out_ok;
240         }
241 
242 out_err:
243         fi = NULL;
244         if (fibh->sbh != fibh->ebh)
245                 brelse(fibh->ebh);
246         brelse(fibh->sbh);
247 out_ok:
248         brelse(epos.bh);
249         kfree(fname);
250 
251         return fi;
252 }
253 
254 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
255                                  unsigned int flags)
256 {
257         struct inode *inode = NULL;
258         struct fileIdentDesc cfi;
259         struct udf_fileident_bh fibh;
260 
261         if (dentry->d_name.len > UDF_NAME_LEN - 2)
262                 return ERR_PTR(-ENAMETOOLONG);
263 
264 #ifdef UDF_RECOVERY
265         /* temporary shorthand for specifying files by inode number */
266         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
267                 struct kernel_lb_addr lb = {
268                         .logicalBlockNum = 0,
269                         .partitionReferenceNum =
270                                 simple_strtoul(dentry->d_name.name + 3,
271                                                 NULL, 0),
272                 };
273                 inode = udf_iget(dir->i_sb, lb);
274                 if (!inode) {
275                         return ERR_PTR(-EACCES);
276                 }
277         } else
278 #endif /* UDF_RECOVERY */
279 
280         if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
281                 struct kernel_lb_addr loc;
282 
283                 if (fibh.sbh != fibh.ebh)
284                         brelse(fibh.ebh);
285                 brelse(fibh.sbh);
286 
287                 loc = lelb_to_cpu(cfi.icb.extLocation);
288                 inode = udf_iget(dir->i_sb, &loc);
289                 if (!inode) {
290                         return ERR_PTR(-EACCES);
291                 }
292         }
293 
294         return d_splice_alias(inode, dentry);
295 }
296 
297 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
298                                            struct dentry *dentry,
299                                            struct udf_fileident_bh *fibh,
300                                            struct fileIdentDesc *cfi, int *err)
301 {
302         struct super_block *sb = dir->i_sb;
303         struct fileIdentDesc *fi = NULL;
304         unsigned char *name = NULL;
305         int namelen;
306         loff_t f_pos;
307         loff_t size = udf_ext0_offset(dir) + dir->i_size;
308         int nfidlen;
309         uint8_t lfi;
310         uint16_t liu;
311         int block;
312         struct kernel_lb_addr eloc;
313         uint32_t elen = 0;
314         sector_t offset;
315         struct extent_position epos = {};
316         struct udf_inode_info *dinfo;
317 
318         fibh->sbh = fibh->ebh = NULL;
319         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
320         if (!name) {
321                 *err = -ENOMEM;
322                 goto out_err;
323         }
324 
325         if (dentry) {
326                 if (!dentry->d_name.len) {
327                         *err = -EINVAL;
328                         goto out_err;
329                 }
330                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
331                                                  dentry->d_name.len);
332                 if (!namelen) {
333                         *err = -ENAMETOOLONG;
334                         goto out_err;
335                 }
336         } else {
337                 namelen = 0;
338         }
339 
340         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
341 
342         f_pos = udf_ext0_offset(dir);
343 
344         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
345         dinfo = UDF_I(dir);
346         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
347                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
348                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
349                         block = udf_get_lb_pblock(dir->i_sb,
350                                         &dinfo->i_location, 0);
351                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
352                         goto add;
353                 }
354                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
355                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
356                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
357                                 epos.offset -= sizeof(struct short_ad);
358                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
359                                 epos.offset -= sizeof(struct long_ad);
360                 } else
361                         offset = 0;
362 
363                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
364                 if (!fibh->sbh) {
365                         *err = -EIO;
366                         goto out_err;
367                 }
368 
369                 block = dinfo->i_location.logicalBlockNum;
370         }
371 
372         while (f_pos < size) {
373                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
374                                         &elen, &offset);
375 
376                 if (!fi) {
377                         *err = -EIO;
378                         goto out_err;
379                 }
380 
381                 liu = le16_to_cpu(cfi->lengthOfImpUse);
382                 lfi = cfi->lengthFileIdent;
383 
384                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
385                         if (((sizeof(struct fileIdentDesc) +
386                                         liu + lfi + 3) & ~3) == nfidlen) {
387                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
388                                 cfi->fileVersionNum = cpu_to_le16(1);
389                                 cfi->fileCharacteristics = 0;
390                                 cfi->lengthFileIdent = namelen;
391                                 cfi->lengthOfImpUse = cpu_to_le16(0);
392                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
393                                                   name))
394                                         goto out_ok;
395                                 else {
396                                         *err = -EIO;
397                                         goto out_err;
398                                 }
399                         }
400                 }
401         }
402 
403 add:
404         f_pos += nfidlen;
405 
406         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
407             sb->s_blocksize - fibh->eoffset < nfidlen) {
408                 brelse(epos.bh);
409                 epos.bh = NULL;
410                 fibh->soffset -= udf_ext0_offset(dir);
411                 fibh->eoffset -= udf_ext0_offset(dir);
412                 f_pos -= udf_ext0_offset(dir);
413                 if (fibh->sbh != fibh->ebh)
414                         brelse(fibh->ebh);
415                 brelse(fibh->sbh);
416                 fibh->sbh = fibh->ebh =
417                                 udf_expand_dir_adinicb(dir, &block, err);
418                 if (!fibh->sbh)
419                         goto out_err;
420                 epos.block = dinfo->i_location;
421                 epos.offset = udf_file_entry_alloc_offset(dir);
422                 /* Load extent udf_expand_dir_adinicb() has created */
423                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
424         }
425 
426         /* Entry fits into current block? */
427         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
428                 fibh->soffset = fibh->eoffset;
429                 fibh->eoffset += nfidlen;
430                 if (fibh->sbh != fibh->ebh) {
431                         brelse(fibh->sbh);
432                         fibh->sbh = fibh->ebh;
433                 }
434 
435                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
436                         block = dinfo->i_location.logicalBlockNum;
437                         fi = (struct fileIdentDesc *)
438                                         (dinfo->i_ext.i_data +
439                                          fibh->soffset -
440                                          udf_ext0_offset(dir) +
441                                          dinfo->i_lenEAttr);
442                 } else {
443                         block = eloc.logicalBlockNum +
444                                         ((elen - 1) >>
445                                                 dir->i_sb->s_blocksize_bits);
446                         fi = (struct fileIdentDesc *)
447                                 (fibh->sbh->b_data + fibh->soffset);
448                 }
449         } else {
450                 /* Round up last extent in the file */
451                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
452                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
453                         epos.offset -= sizeof(struct short_ad);
454                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
455                         epos.offset -= sizeof(struct long_ad);
456                 udf_write_aext(dir, &epos, &eloc, elen, 1);
457                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
458                                         - 1) & ~(sb->s_blocksize - 1);
459 
460                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
461                 fibh->eoffset += nfidlen - sb->s_blocksize;
462                 if (fibh->sbh != fibh->ebh) {
463                         brelse(fibh->sbh);
464                         fibh->sbh = fibh->ebh;
465                 }
466 
467                 block = eloc.logicalBlockNum + ((elen - 1) >>
468                                                 dir->i_sb->s_blocksize_bits);
469                 fibh->ebh = udf_bread(dir,
470                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
471                 if (!fibh->ebh)
472                         goto out_err;
473                 /* Extents could have been merged, invalidate our position */
474                 brelse(epos.bh);
475                 epos.bh = NULL;
476                 epos.block = dinfo->i_location;
477                 epos.offset = udf_file_entry_alloc_offset(dir);
478 
479                 if (!fibh->soffset) {
480                         /* Find the freshly allocated block */
481                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
482                                 (EXT_RECORDED_ALLOCATED >> 30))
483                                 ;
484                         block = eloc.logicalBlockNum + ((elen - 1) >>
485                                         dir->i_sb->s_blocksize_bits);
486                         brelse(fibh->sbh);
487                         fibh->sbh = fibh->ebh;
488                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
489                 } else {
490                         fi = (struct fileIdentDesc *)
491                                 (fibh->sbh->b_data + sb->s_blocksize +
492                                         fibh->soffset);
493                 }
494         }
495 
496         memset(cfi, 0, sizeof(struct fileIdentDesc));
497         if (UDF_SB(sb)->s_udfrev >= 0x0200)
498                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
499                             sizeof(struct tag));
500         else
501                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
502                             sizeof(struct tag));
503         cfi->fileVersionNum = cpu_to_le16(1);
504         cfi->lengthFileIdent = namelen;
505         cfi->lengthOfImpUse = cpu_to_le16(0);
506         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
507                 dir->i_size += nfidlen;
508                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
509                         dinfo->i_lenAlloc += nfidlen;
510                 else {
511                         /* Find the last extent and truncate it to proper size */
512                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
513                                 (EXT_RECORDED_ALLOCATED >> 30))
514                                 ;
515                         elen -= dinfo->i_lenExtents - dir->i_size;
516                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
517                                 epos.offset -= sizeof(struct short_ad);
518                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
519                                 epos.offset -= sizeof(struct long_ad);
520                         udf_write_aext(dir, &epos, &eloc, elen, 1);
521                         dinfo->i_lenExtents = dir->i_size;
522                 }
523 
524                 mark_inode_dirty(dir);
525                 goto out_ok;
526         } else {
527                 *err = -EIO;
528                 goto out_err;
529         }
530 
531 out_err:
532         fi = NULL;
533         if (fibh->sbh != fibh->ebh)
534                 brelse(fibh->ebh);
535         brelse(fibh->sbh);
536 out_ok:
537         brelse(epos.bh);
538         kfree(name);
539         return fi;
540 }
541 
542 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
543                             struct udf_fileident_bh *fibh,
544                             struct fileIdentDesc *cfi)
545 {
546         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
547 
548         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
549                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
550 
551         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
552 }
553 
554 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
555                       bool excl)
556 {
557         struct udf_fileident_bh fibh;
558         struct inode *inode;
559         struct fileIdentDesc cfi, *fi;
560         int err;
561         struct udf_inode_info *iinfo;
562 
563         inode = udf_new_inode(dir, mode, &err);
564         if (!inode) {
565                 return err;
566         }
567 
568         iinfo = UDF_I(inode);
569         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
570                 inode->i_data.a_ops = &udf_adinicb_aops;
571         else
572                 inode->i_data.a_ops = &udf_aops;
573         inode->i_op = &udf_file_inode_operations;
574         inode->i_fop = &udf_file_operations;
575         mark_inode_dirty(inode);
576 
577         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
578         if (!fi) {
579                 inode_dec_link_count(inode);
580                 iput(inode);
581                 return err;
582         }
583         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
584         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
585         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
586                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
587         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
588         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
589                 mark_inode_dirty(dir);
590         if (fibh.sbh != fibh.ebh)
591                 brelse(fibh.ebh);
592         brelse(fibh.sbh);
593         d_instantiate(dentry, inode);
594 
595         return 0;
596 }
597 
598 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
599 {
600         struct inode *inode;
601         struct udf_inode_info *iinfo;
602         int err;
603 
604         inode = udf_new_inode(dir, mode, &err);
605         if (!inode)
606                 return err;
607 
608         iinfo = UDF_I(inode);
609         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
610                 inode->i_data.a_ops = &udf_adinicb_aops;
611         else
612                 inode->i_data.a_ops = &udf_aops;
613         inode->i_op = &udf_file_inode_operations;
614         inode->i_fop = &udf_file_operations;
615         mark_inode_dirty(inode);
616 
617         d_tmpfile(dentry, inode);
618         return 0;
619 }
620 
621 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
622                      dev_t rdev)
623 {
624         struct inode *inode;
625         struct udf_fileident_bh fibh;
626         struct fileIdentDesc cfi, *fi;
627         int err;
628         struct udf_inode_info *iinfo;
629 
630         if (!old_valid_dev(rdev))
631                 return -EINVAL;
632 
633         err = -EIO;
634         inode = udf_new_inode(dir, mode, &err);
635         if (!inode)
636                 goto out;
637 
638         iinfo = UDF_I(inode);
639         init_special_inode(inode, mode, rdev);
640         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
641         if (!fi) {
642                 inode_dec_link_count(inode);
643                 iput(inode);
644                 return err;
645         }
646         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
647         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
648         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
649                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
650         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
651         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
652                 mark_inode_dirty(dir);
653         mark_inode_dirty(inode);
654 
655         if (fibh.sbh != fibh.ebh)
656                 brelse(fibh.ebh);
657         brelse(fibh.sbh);
658         d_instantiate(dentry, inode);
659         err = 0;
660 
661 out:
662         return err;
663 }
664 
665 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
666 {
667         struct inode *inode;
668         struct udf_fileident_bh fibh;
669         struct fileIdentDesc cfi, *fi;
670         int err;
671         struct udf_inode_info *dinfo = UDF_I(dir);
672         struct udf_inode_info *iinfo;
673 
674         err = -EIO;
675         inode = udf_new_inode(dir, S_IFDIR | mode, &err);
676         if (!inode)
677                 goto out;
678 
679         iinfo = UDF_I(inode);
680         inode->i_op = &udf_dir_inode_operations;
681         inode->i_fop = &udf_dir_operations;
682         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
683         if (!fi) {
684                 inode_dec_link_count(inode);
685                 iput(inode);
686                 goto out;
687         }
688         set_nlink(inode, 2);
689         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
690         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
691         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
692                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
693         cfi.fileCharacteristics =
694                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
695         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
696         brelse(fibh.sbh);
697         mark_inode_dirty(inode);
698 
699         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
700         if (!fi) {
701                 clear_nlink(inode);
702                 mark_inode_dirty(inode);
703                 iput(inode);
704                 goto out;
705         }
706         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
707         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
708         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
709                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
710         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
711         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
712         inc_nlink(dir);
713         mark_inode_dirty(dir);
714         d_instantiate(dentry, inode);
715         if (fibh.sbh != fibh.ebh)
716                 brelse(fibh.ebh);
717         brelse(fibh.sbh);
718         err = 0;
719 
720 out:
721         return err;
722 }
723 
724 static int empty_dir(struct inode *dir)
725 {
726         struct fileIdentDesc *fi, cfi;
727         struct udf_fileident_bh fibh;
728         loff_t f_pos;
729         loff_t size = udf_ext0_offset(dir) + dir->i_size;
730         int block;
731         struct kernel_lb_addr eloc;
732         uint32_t elen;
733         sector_t offset;
734         struct extent_position epos = {};
735         struct udf_inode_info *dinfo = UDF_I(dir);
736 
737         f_pos = udf_ext0_offset(dir);
738         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
739 
740         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
741                 fibh.sbh = fibh.ebh = NULL;
742         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
743                               &epos, &eloc, &elen, &offset) ==
744                                         (EXT_RECORDED_ALLOCATED >> 30)) {
745                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
746                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
747                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
748                                 epos.offset -= sizeof(struct short_ad);
749                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
750                                 epos.offset -= sizeof(struct long_ad);
751                 } else
752                         offset = 0;
753 
754                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
755                 if (!fibh.sbh) {
756                         brelse(epos.bh);
757                         return 0;
758                 }
759         } else {
760                 brelse(epos.bh);
761                 return 0;
762         }
763 
764         while (f_pos < size) {
765                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
766                                         &elen, &offset);
767                 if (!fi) {
768                         if (fibh.sbh != fibh.ebh)
769                                 brelse(fibh.ebh);
770                         brelse(fibh.sbh);
771                         brelse(epos.bh);
772                         return 0;
773                 }
774 
775                 if (cfi.lengthFileIdent &&
776                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
777                         if (fibh.sbh != fibh.ebh)
778                                 brelse(fibh.ebh);
779                         brelse(fibh.sbh);
780                         brelse(epos.bh);
781                         return 0;
782                 }
783         }
784 
785         if (fibh.sbh != fibh.ebh)
786                 brelse(fibh.ebh);
787         brelse(fibh.sbh);
788         brelse(epos.bh);
789 
790         return 1;
791 }
792 
793 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
794 {
795         int retval;
796         struct inode *inode = dentry->d_inode;
797         struct udf_fileident_bh fibh;
798         struct fileIdentDesc *fi, cfi;
799         struct kernel_lb_addr tloc;
800 
801         retval = -ENOENT;
802         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
803         if (!fi)
804                 goto out;
805 
806         retval = -EIO;
807         tloc = lelb_to_cpu(cfi.icb.extLocation);
808         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
809                 goto end_rmdir;
810         retval = -ENOTEMPTY;
811         if (!empty_dir(inode))
812                 goto end_rmdir;
813         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
814         if (retval)
815                 goto end_rmdir;
816         if (inode->i_nlink != 2)
817                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
818                          inode->i_nlink);
819         clear_nlink(inode);
820         inode->i_size = 0;
821         inode_dec_link_count(dir);
822         inode->i_ctime = dir->i_ctime = dir->i_mtime =
823                                                 current_fs_time(dir->i_sb);
824         mark_inode_dirty(dir);
825 
826 end_rmdir:
827         if (fibh.sbh != fibh.ebh)
828                 brelse(fibh.ebh);
829         brelse(fibh.sbh);
830 
831 out:
832         return retval;
833 }
834 
835 static int udf_unlink(struct inode *dir, struct dentry *dentry)
836 {
837         int retval;
838         struct inode *inode = dentry->d_inode;
839         struct udf_fileident_bh fibh;
840         struct fileIdentDesc *fi;
841         struct fileIdentDesc cfi;
842         struct kernel_lb_addr tloc;
843 
844         retval = -ENOENT;
845         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
846         if (!fi)
847                 goto out;
848 
849         retval = -EIO;
850         tloc = lelb_to_cpu(cfi.icb.extLocation);
851         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
852                 goto end_unlink;
853 
854         if (!inode->i_nlink) {
855                 udf_debug("Deleting nonexistent file (%lu), %d\n",
856                           inode->i_ino, inode->i_nlink);
857                 set_nlink(inode, 1);
858         }
859         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
860         if (retval)
861                 goto end_unlink;
862         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
863         mark_inode_dirty(dir);
864         inode_dec_link_count(inode);
865         inode->i_ctime = dir->i_ctime;
866         retval = 0;
867 
868 end_unlink:
869         if (fibh.sbh != fibh.ebh)
870                 brelse(fibh.ebh);
871         brelse(fibh.sbh);
872 
873 out:
874         return retval;
875 }
876 
877 static int udf_symlink(struct inode *dir, struct dentry *dentry,
878                        const char *symname)
879 {
880         struct inode *inode;
881         struct pathComponent *pc;
882         const char *compstart;
883         struct udf_fileident_bh fibh;
884         struct extent_position epos = {};
885         int eoffset, elen = 0;
886         struct fileIdentDesc *fi;
887         struct fileIdentDesc cfi;
888         uint8_t *ea;
889         int err;
890         int block;
891         unsigned char *name = NULL;
892         int namelen;
893         struct udf_inode_info *iinfo;
894         struct super_block *sb = dir->i_sb;
895 
896         inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
897         if (!inode)
898                 goto out;
899 
900         iinfo = UDF_I(inode);
901         down_write(&iinfo->i_data_sem);
902         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
903         if (!name) {
904                 err = -ENOMEM;
905                 goto out_no_entry;
906         }
907 
908         inode->i_data.a_ops = &udf_symlink_aops;
909         inode->i_op = &udf_symlink_inode_operations;
910 
911         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
912                 struct kernel_lb_addr eloc;
913                 uint32_t bsize;
914 
915                 block = udf_new_block(sb, inode,
916                                 iinfo->i_location.partitionReferenceNum,
917                                 iinfo->i_location.logicalBlockNum, &err);
918                 if (!block)
919                         goto out_no_entry;
920                 epos.block = iinfo->i_location;
921                 epos.offset = udf_file_entry_alloc_offset(inode);
922                 epos.bh = NULL;
923                 eloc.logicalBlockNum = block;
924                 eloc.partitionReferenceNum =
925                                 iinfo->i_location.partitionReferenceNum;
926                 bsize = sb->s_blocksize;
927                 iinfo->i_lenExtents = bsize;
928                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
929                 brelse(epos.bh);
930 
931                 block = udf_get_pblock(sb, block,
932                                 iinfo->i_location.partitionReferenceNum,
933                                 0);
934                 epos.bh = udf_tgetblk(sb, block);
935                 lock_buffer(epos.bh);
936                 memset(epos.bh->b_data, 0x00, bsize);
937                 set_buffer_uptodate(epos.bh);
938                 unlock_buffer(epos.bh);
939                 mark_buffer_dirty_inode(epos.bh, inode);
940                 ea = epos.bh->b_data + udf_ext0_offset(inode);
941         } else
942                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
943 
944         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
945         pc = (struct pathComponent *)ea;
946 
947         if (*symname == '/') {
948                 do {
949                         symname++;
950                 } while (*symname == '/');
951 
952                 pc->componentType = 1;
953                 pc->lengthComponentIdent = 0;
954                 pc->componentFileVersionNum = 0;
955                 elen += sizeof(struct pathComponent);
956         }
957 
958         err = -ENAMETOOLONG;
959 
960         while (*symname) {
961                 if (elen + sizeof(struct pathComponent) > eoffset)
962                         goto out_no_entry;
963 
964                 pc = (struct pathComponent *)(ea + elen);
965 
966                 compstart = symname;
967 
968                 do {
969                         symname++;
970                 } while (*symname && *symname != '/');
971 
972                 pc->componentType = 5;
973                 pc->lengthComponentIdent = 0;
974                 pc->componentFileVersionNum = 0;
975                 if (compstart[0] == '.') {
976                         if ((symname - compstart) == 1)
977                                 pc->componentType = 4;
978                         else if ((symname - compstart) == 2 &&
979                                         compstart[1] == '.')
980                                 pc->componentType = 3;
981                 }
982 
983                 if (pc->componentType == 5) {
984                         namelen = udf_put_filename(sb, compstart, name,
985                                                    symname - compstart);
986                         if (!namelen)
987                                 goto out_no_entry;
988 
989                         if (elen + sizeof(struct pathComponent) + namelen >
990                                         eoffset)
991                                 goto out_no_entry;
992                         else
993                                 pc->lengthComponentIdent = namelen;
994 
995                         memcpy(pc->componentIdent, name, namelen);
996                 }
997 
998                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
999 
1000                 if (*symname) {
1001                         do {
1002                                 symname++;
1003                         } while (*symname == '/');
1004                 }
1005         }
1006 
1007         brelse(epos.bh);
1008         inode->i_size = elen;
1009         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1010                 iinfo->i_lenAlloc = inode->i_size;
1011         else
1012                 udf_truncate_tail_extent(inode);
1013         mark_inode_dirty(inode);
1014 
1015         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1016         if (!fi)
1017                 goto out_no_entry;
1018         cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1019         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1020         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1021                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1022                         cpu_to_le32(lvid_get_unique_id(sb));
1023         }
1024         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1025         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1026                 mark_inode_dirty(dir);
1027         up_write(&iinfo->i_data_sem);
1028         if (fibh.sbh != fibh.ebh)
1029                 brelse(fibh.ebh);
1030         brelse(fibh.sbh);
1031         d_instantiate(dentry, inode);
1032         err = 0;
1033 
1034 out:
1035         kfree(name);
1036         return err;
1037 
1038 out_no_entry:
1039         up_write(&iinfo->i_data_sem);
1040         inode_dec_link_count(inode);
1041         iput(inode);
1042         goto out;
1043 }
1044 
1045 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1046                     struct dentry *dentry)
1047 {
1048         struct inode *inode = old_dentry->d_inode;
1049         struct udf_fileident_bh fibh;
1050         struct fileIdentDesc cfi, *fi;
1051         int err;
1052 
1053         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1054         if (!fi) {
1055                 return err;
1056         }
1057         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1058         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1059         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1060                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1061                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1062         }
1063         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1064         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1065                 mark_inode_dirty(dir);
1066 
1067         if (fibh.sbh != fibh.ebh)
1068                 brelse(fibh.ebh);
1069         brelse(fibh.sbh);
1070         inc_nlink(inode);
1071         inode->i_ctime = current_fs_time(inode->i_sb);
1072         mark_inode_dirty(inode);
1073         ihold(inode);
1074         d_instantiate(dentry, inode);
1075 
1076         return 0;
1077 }
1078 
1079 /* Anybody can rename anything with this: the permission checks are left to the
1080  * higher-level routines.
1081  */
1082 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1083                       struct inode *new_dir, struct dentry *new_dentry)
1084 {
1085         struct inode *old_inode = old_dentry->d_inode;
1086         struct inode *new_inode = new_dentry->d_inode;
1087         struct udf_fileident_bh ofibh, nfibh;
1088         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1089         struct fileIdentDesc ocfi, ncfi;
1090         struct buffer_head *dir_bh = NULL;
1091         int retval = -ENOENT;
1092         struct kernel_lb_addr tloc;
1093         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1094 
1095         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1096         if (ofi) {
1097                 if (ofibh.sbh != ofibh.ebh)
1098                         brelse(ofibh.ebh);
1099                 brelse(ofibh.sbh);
1100         }
1101         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1102         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1103             != old_inode->i_ino)
1104                 goto end_rename;
1105 
1106         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1107         if (nfi) {
1108                 if (!new_inode) {
1109                         if (nfibh.sbh != nfibh.ebh)
1110                                 brelse(nfibh.ebh);
1111                         brelse(nfibh.sbh);
1112                         nfi = NULL;
1113                 }
1114         }
1115         if (S_ISDIR(old_inode->i_mode)) {
1116                 int offset = udf_ext0_offset(old_inode);
1117 
1118                 if (new_inode) {
1119                         retval = -ENOTEMPTY;
1120                         if (!empty_dir(new_inode))
1121                                 goto end_rename;
1122                 }
1123                 retval = -EIO;
1124                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1125                         dir_fi = udf_get_fileident(
1126                                         old_iinfo->i_ext.i_data -
1127                                           (old_iinfo->i_efe ?
1128                                            sizeof(struct extendedFileEntry) :
1129                                            sizeof(struct fileEntry)),
1130                                         old_inode->i_sb->s_blocksize, &offset);
1131                 } else {
1132                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1133                         if (!dir_bh)
1134                                 goto end_rename;
1135                         dir_fi = udf_get_fileident(dir_bh->b_data,
1136                                         old_inode->i_sb->s_blocksize, &offset);
1137                 }
1138                 if (!dir_fi)
1139                         goto end_rename;
1140                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1141                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1142                                 old_dir->i_ino)
1143                         goto end_rename;
1144         }
1145         if (!nfi) {
1146                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1147                                     &retval);
1148                 if (!nfi)
1149                         goto end_rename;
1150         }
1151 
1152         /*
1153          * Like most other Unix systems, set the ctime for inodes on a
1154          * rename.
1155          */
1156         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1157         mark_inode_dirty(old_inode);
1158 
1159         /*
1160          * ok, that's it
1161          */
1162         ncfi.fileVersionNum = ocfi.fileVersionNum;
1163         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1164         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1165         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1166 
1167         /* The old fid may have moved - find it again */
1168         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1169         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1170 
1171         if (new_inode) {
1172                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1173                 inode_dec_link_count(new_inode);
1174         }
1175         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1176         mark_inode_dirty(old_dir);
1177 
1178         if (dir_fi) {
1179                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1180                 udf_update_tag((char *)dir_fi,
1181                                 (sizeof(struct fileIdentDesc) +
1182                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1183                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1184                         mark_inode_dirty(old_inode);
1185                 else
1186                         mark_buffer_dirty_inode(dir_bh, old_inode);
1187 
1188                 inode_dec_link_count(old_dir);
1189                 if (new_inode)
1190                         inode_dec_link_count(new_inode);
1191                 else {
1192                         inc_nlink(new_dir);
1193                         mark_inode_dirty(new_dir);
1194                 }
1195         }
1196 
1197         if (ofi) {
1198                 if (ofibh.sbh != ofibh.ebh)
1199                         brelse(ofibh.ebh);
1200                 brelse(ofibh.sbh);
1201         }
1202 
1203         retval = 0;
1204 
1205 end_rename:
1206         brelse(dir_bh);
1207         if (nfi) {
1208                 if (nfibh.sbh != nfibh.ebh)
1209                         brelse(nfibh.ebh);
1210                 brelse(nfibh.sbh);
1211         }
1212 
1213         return retval;
1214 }
1215 
1216 static struct dentry *udf_get_parent(struct dentry *child)
1217 {
1218         struct kernel_lb_addr tloc;
1219         struct inode *inode = NULL;
1220         struct qstr dotdot = QSTR_INIT("..", 2);
1221         struct fileIdentDesc cfi;
1222         struct udf_fileident_bh fibh;
1223 
1224         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1225                 goto out_unlock;
1226 
1227         if (fibh.sbh != fibh.ebh)
1228                 brelse(fibh.ebh);
1229         brelse(fibh.sbh);
1230 
1231         tloc = lelb_to_cpu(cfi.icb.extLocation);
1232         inode = udf_iget(child->d_inode->i_sb, &tloc);
1233         if (!inode)
1234                 goto out_unlock;
1235 
1236         return d_obtain_alias(inode);
1237 out_unlock:
1238         return ERR_PTR(-EACCES);
1239 }
1240 
1241 
1242 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1243                                         u16 partref, __u32 generation)
1244 {
1245         struct inode *inode;
1246         struct kernel_lb_addr loc;
1247 
1248         if (block == 0)
1249                 return ERR_PTR(-ESTALE);
1250 
1251         loc.logicalBlockNum = block;
1252         loc.partitionReferenceNum = partref;
1253         inode = udf_iget(sb, &loc);
1254 
1255         if (inode == NULL)
1256                 return ERR_PTR(-ENOMEM);
1257 
1258         if (generation && inode->i_generation != generation) {
1259                 iput(inode);
1260                 return ERR_PTR(-ESTALE);
1261         }
1262         return d_obtain_alias(inode);
1263 }
1264 
1265 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1266                                        struct fid *fid, int fh_len, int fh_type)
1267 {
1268         if ((fh_len != 3 && fh_len != 5) ||
1269             (fh_type != FILEID_UDF_WITH_PARENT &&
1270              fh_type != FILEID_UDF_WITHOUT_PARENT))
1271                 return NULL;
1272 
1273         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1274                         fid->udf.generation);
1275 }
1276 
1277 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1278                                        struct fid *fid, int fh_len, int fh_type)
1279 {
1280         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1281                 return NULL;
1282 
1283         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1284                                  fid->udf.parent_partref,
1285                                  fid->udf.parent_generation);
1286 }
1287 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1288                          struct inode *parent)
1289 {
1290         int len = *lenp;
1291         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1292         struct fid *fid = (struct fid *)fh;
1293         int type = FILEID_UDF_WITHOUT_PARENT;
1294 
1295         if (parent && (len < 5)) {
1296                 *lenp = 5;
1297                 return FILEID_INVALID;
1298         } else if (len < 3) {
1299                 *lenp = 3;
1300                 return FILEID_INVALID;
1301         }
1302 
1303         *lenp = 3;
1304         fid->udf.block = location.logicalBlockNum;
1305         fid->udf.partref = location.partitionReferenceNum;
1306         fid->udf.parent_partref = 0;
1307         fid->udf.generation = inode->i_generation;
1308 
1309         if (parent) {
1310                 location = UDF_I(parent)->i_location;
1311                 fid->udf.parent_block = location.logicalBlockNum;
1312                 fid->udf.parent_partref = location.partitionReferenceNum;
1313                 fid->udf.parent_generation = inode->i_generation;
1314                 *lenp = 5;
1315                 type = FILEID_UDF_WITH_PARENT;
1316         }
1317 
1318         return type;
1319 }
1320 
1321 const struct export_operations udf_export_ops = {
1322         .encode_fh      = udf_encode_fh,
1323         .fh_to_dentry   = udf_fh_to_dentry,
1324         .fh_to_parent   = udf_fh_to_parent,
1325         .get_parent     = udf_get_parent,
1326 };
1327 
1328 const struct inode_operations udf_dir_inode_operations = {
1329         .lookup                         = udf_lookup,
1330         .create                         = udf_create,
1331         .link                           = udf_link,
1332         .unlink                         = udf_unlink,
1333         .symlink                        = udf_symlink,
1334         .mkdir                          = udf_mkdir,
1335         .rmdir                          = udf_rmdir,
1336         .mknod                          = udf_mknod,
1337         .rename                         = udf_rename,
1338         .tmpfile                        = udf_tmpfile,
1339 };
1340 const struct inode_operations udf_symlink_inode_operations = {
1341         .readlink       = generic_readlink,
1342         .follow_link    = page_follow_link_light,
1343         .put_link       = page_put_link,
1344 };
1345 

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