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

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

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