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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         udf_pblk_t block;
168         int flen;
169         unsigned char *fname = NULL, *copy_name = NULL;
170         unsigned char *nameptr;
171         uint8_t lfi;
172         uint16_t liu;
173         loff_t size;
174         struct kernel_lb_addr eloc;
175         uint32_t elen;
176         sector_t offset;
177         struct extent_position epos = {};
178         struct udf_inode_info *dinfo = UDF_I(dir);
179         int isdotdot = child->len == 2 &&
180                 child->name[0] == '.' && child->name[1] == '.';
181         struct super_block *sb = dir->i_sb;
182 
183         size = udf_ext0_offset(dir) + dir->i_size;
184         f_pos = udf_ext0_offset(dir);
185 
186         fibh->sbh = fibh->ebh = NULL;
187         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
188         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
189                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
190                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
191                         fi = ERR_PTR(-EIO);
192                         goto out_err;
193                 }
194 
195                 block = udf_get_lb_pblock(sb, &eloc, offset);
196                 if ((++offset << sb->s_blocksize_bits) < elen) {
197                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
198                                 epos.offset -= sizeof(struct short_ad);
199                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
200                                 epos.offset -= sizeof(struct long_ad);
201                 } else
202                         offset = 0;
203 
204                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
205                 if (!fibh->sbh) {
206                         fi = ERR_PTR(-EIO);
207                         goto out_err;
208                 }
209         }
210 
211         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
212         if (!fname) {
213                 fi = ERR_PTR(-ENOMEM);
214                 goto out_err;
215         }
216 
217         while (f_pos < size) {
218                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
219                                         &elen, &offset);
220                 if (!fi) {
221                         fi = ERR_PTR(-EIO);
222                         goto out_err;
223                 }
224 
225                 liu = le16_to_cpu(cfi->lengthOfImpUse);
226                 lfi = cfi->lengthFileIdent;
227 
228                 if (fibh->sbh == fibh->ebh) {
229                         nameptr = fi->fileIdent + liu;
230                 } else {
231                         int poffset;    /* Unpaded ending offset */
232 
233                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
234                                         liu + lfi;
235 
236                         if (poffset >= lfi)
237                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
238                                                       poffset - lfi);
239                         else {
240                                 if (!copy_name) {
241                                         copy_name = kmalloc(UDF_NAME_LEN,
242                                                             GFP_NOFS);
243                                         if (!copy_name) {
244                                                 fi = ERR_PTR(-ENOMEM);
245                                                 goto out_err;
246                                         }
247                                 }
248                                 nameptr = copy_name;
249                                 memcpy(nameptr, fi->fileIdent + liu,
250                                         lfi - poffset);
251                                 memcpy(nameptr + lfi - poffset,
252                                         fibh->ebh->b_data, poffset);
253                         }
254                 }
255 
256                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
257                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
258                                 continue;
259                 }
260 
261                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
262                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263                                 continue;
264                 }
265 
266                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
267                     isdotdot)
268                         goto out_ok;
269 
270                 if (!lfi)
271                         continue;
272 
273                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
274                 if (flen < 0) {
275                         fi = ERR_PTR(flen);
276                         goto out_err;
277                 }
278 
279                 if (udf_match(flen, fname, child->len, child->name))
280                         goto out_ok;
281         }
282 
283         fi = NULL;
284 out_err:
285         if (fibh->sbh != fibh->ebh)
286                 brelse(fibh->ebh);
287         brelse(fibh->sbh);
288 out_ok:
289         brelse(epos.bh);
290         kfree(fname);
291         kfree(copy_name);
292 
293         return fi;
294 }
295 
296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
297                                  unsigned int flags)
298 {
299         struct inode *inode = NULL;
300         struct fileIdentDesc cfi;
301         struct udf_fileident_bh fibh;
302         struct fileIdentDesc *fi;
303 
304         if (dentry->d_name.len > UDF_NAME_LEN)
305                 return ERR_PTR(-ENAMETOOLONG);
306 
307 #ifdef UDF_RECOVERY
308         /* temporary shorthand for specifying files by inode number */
309         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
310                 struct kernel_lb_addr lb = {
311                         .logicalBlockNum = 0,
312                         .partitionReferenceNum =
313                                 simple_strtoul(dentry->d_name.name + 3,
314                                                 NULL, 0),
315                 };
316                 inode = udf_iget(dir->i_sb, lb);
317                 if (IS_ERR(inode))
318                         return inode;
319         } else
320 #endif /* UDF_RECOVERY */
321 
322         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
323         if (IS_ERR(fi))
324                 return ERR_CAST(fi);
325 
326         if (fi) {
327                 struct kernel_lb_addr loc;
328 
329                 if (fibh.sbh != fibh.ebh)
330                         brelse(fibh.ebh);
331                 brelse(fibh.sbh);
332 
333                 loc = lelb_to_cpu(cfi.icb.extLocation);
334                 inode = udf_iget(dir->i_sb, &loc);
335                 if (IS_ERR(inode))
336                         return ERR_CAST(inode);
337         }
338 
339         return d_splice_alias(inode, dentry);
340 }
341 
342 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
343                                            struct dentry *dentry,
344                                            struct udf_fileident_bh *fibh,
345                                            struct fileIdentDesc *cfi, int *err)
346 {
347         struct super_block *sb = dir->i_sb;
348         struct fileIdentDesc *fi = NULL;
349         unsigned char *name = NULL;
350         int namelen;
351         loff_t f_pos;
352         loff_t size = udf_ext0_offset(dir) + dir->i_size;
353         int nfidlen;
354         uint8_t lfi;
355         uint16_t liu;
356         udf_pblk_t block;
357         struct kernel_lb_addr eloc;
358         uint32_t elen = 0;
359         sector_t offset;
360         struct extent_position epos = {};
361         struct udf_inode_info *dinfo;
362 
363         fibh->sbh = fibh->ebh = NULL;
364         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
365         if (!name) {
366                 *err = -ENOMEM;
367                 goto out_err;
368         }
369 
370         if (dentry) {
371                 if (!dentry->d_name.len) {
372                         *err = -EINVAL;
373                         goto out_err;
374                 }
375                 namelen = udf_put_filename(sb, dentry->d_name.name,
376                                            dentry->d_name.len,
377                                            name, UDF_NAME_LEN_CS0);
378                 if (!namelen) {
379                         *err = -ENAMETOOLONG;
380                         goto out_err;
381                 }
382         } else {
383                 namelen = 0;
384         }
385 
386         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
387 
388         f_pos = udf_ext0_offset(dir);
389 
390         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
391         dinfo = UDF_I(dir);
392         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
393                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
394                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
395                         block = udf_get_lb_pblock(dir->i_sb,
396                                         &dinfo->i_location, 0);
397                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
398                         goto add;
399                 }
400                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
401                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
402                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
403                                 epos.offset -= sizeof(struct short_ad);
404                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
405                                 epos.offset -= sizeof(struct long_ad);
406                 } else
407                         offset = 0;
408 
409                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
410                 if (!fibh->sbh) {
411                         *err = -EIO;
412                         goto out_err;
413                 }
414 
415                 block = dinfo->i_location.logicalBlockNum;
416         }
417 
418         while (f_pos < size) {
419                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
420                                         &elen, &offset);
421 
422                 if (!fi) {
423                         *err = -EIO;
424                         goto out_err;
425                 }
426 
427                 liu = le16_to_cpu(cfi->lengthOfImpUse);
428                 lfi = cfi->lengthFileIdent;
429 
430                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
431                         if (((sizeof(struct fileIdentDesc) +
432                                         liu + lfi + 3) & ~3) == nfidlen) {
433                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
434                                 cfi->fileVersionNum = cpu_to_le16(1);
435                                 cfi->fileCharacteristics = 0;
436                                 cfi->lengthFileIdent = namelen;
437                                 cfi->lengthOfImpUse = cpu_to_le16(0);
438                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
439                                                   name))
440                                         goto out_ok;
441                                 else {
442                                         *err = -EIO;
443                                         goto out_err;
444                                 }
445                         }
446                 }
447         }
448 
449 add:
450         f_pos += nfidlen;
451 
452         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
453             sb->s_blocksize - fibh->eoffset < nfidlen) {
454                 brelse(epos.bh);
455                 epos.bh = NULL;
456                 fibh->soffset -= udf_ext0_offset(dir);
457                 fibh->eoffset -= udf_ext0_offset(dir);
458                 f_pos -= udf_ext0_offset(dir);
459                 if (fibh->sbh != fibh->ebh)
460                         brelse(fibh->ebh);
461                 brelse(fibh->sbh);
462                 fibh->sbh = fibh->ebh =
463                                 udf_expand_dir_adinicb(dir, &block, err);
464                 if (!fibh->sbh)
465                         goto out_err;
466                 epos.block = dinfo->i_location;
467                 epos.offset = udf_file_entry_alloc_offset(dir);
468                 /* Load extent udf_expand_dir_adinicb() has created */
469                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
470         }
471 
472         /* Entry fits into current block? */
473         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
474                 fibh->soffset = fibh->eoffset;
475                 fibh->eoffset += nfidlen;
476                 if (fibh->sbh != fibh->ebh) {
477                         brelse(fibh->sbh);
478                         fibh->sbh = fibh->ebh;
479                 }
480 
481                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
482                         block = dinfo->i_location.logicalBlockNum;
483                         fi = (struct fileIdentDesc *)
484                                         (dinfo->i_ext.i_data +
485                                          fibh->soffset -
486                                          udf_ext0_offset(dir) +
487                                          dinfo->i_lenEAttr);
488                 } else {
489                         block = eloc.logicalBlockNum +
490                                         ((elen - 1) >>
491                                                 dir->i_sb->s_blocksize_bits);
492                         fi = (struct fileIdentDesc *)
493                                 (fibh->sbh->b_data + fibh->soffset);
494                 }
495         } else {
496                 /* Round up last extent in the file */
497                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
498                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
499                         epos.offset -= sizeof(struct short_ad);
500                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
501                         epos.offset -= sizeof(struct long_ad);
502                 udf_write_aext(dir, &epos, &eloc, elen, 1);
503                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
504                                         - 1) & ~(sb->s_blocksize - 1);
505 
506                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
507                 fibh->eoffset += nfidlen - sb->s_blocksize;
508                 if (fibh->sbh != fibh->ebh) {
509                         brelse(fibh->sbh);
510                         fibh->sbh = fibh->ebh;
511                 }
512 
513                 block = eloc.logicalBlockNum + ((elen - 1) >>
514                                                 dir->i_sb->s_blocksize_bits);
515                 fibh->ebh = udf_bread(dir,
516                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
517                 if (!fibh->ebh)
518                         goto out_err;
519                 /* Extents could have been merged, invalidate our position */
520                 brelse(epos.bh);
521                 epos.bh = NULL;
522                 epos.block = dinfo->i_location;
523                 epos.offset = udf_file_entry_alloc_offset(dir);
524 
525                 if (!fibh->soffset) {
526                         /* Find the freshly allocated block */
527                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
528                                 (EXT_RECORDED_ALLOCATED >> 30))
529                                 ;
530                         block = eloc.logicalBlockNum + ((elen - 1) >>
531                                         dir->i_sb->s_blocksize_bits);
532                         brelse(fibh->sbh);
533                         fibh->sbh = fibh->ebh;
534                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
535                 } else {
536                         fi = (struct fileIdentDesc *)
537                                 (fibh->sbh->b_data + sb->s_blocksize +
538                                         fibh->soffset);
539                 }
540         }
541 
542         memset(cfi, 0, sizeof(struct fileIdentDesc));
543         if (UDF_SB(sb)->s_udfrev >= 0x0200)
544                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
545                             sizeof(struct tag));
546         else
547                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
548                             sizeof(struct tag));
549         cfi->fileVersionNum = cpu_to_le16(1);
550         cfi->lengthFileIdent = namelen;
551         cfi->lengthOfImpUse = cpu_to_le16(0);
552         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
553                 dir->i_size += nfidlen;
554                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
555                         dinfo->i_lenAlloc += nfidlen;
556                 else {
557                         /* Find the last extent and truncate it to proper size */
558                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
559                                 (EXT_RECORDED_ALLOCATED >> 30))
560                                 ;
561                         elen -= dinfo->i_lenExtents - dir->i_size;
562                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
563                                 epos.offset -= sizeof(struct short_ad);
564                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
565                                 epos.offset -= sizeof(struct long_ad);
566                         udf_write_aext(dir, &epos, &eloc, elen, 1);
567                         dinfo->i_lenExtents = dir->i_size;
568                 }
569 
570                 mark_inode_dirty(dir);
571                 goto out_ok;
572         } else {
573                 *err = -EIO;
574                 goto out_err;
575         }
576 
577 out_err:
578         fi = NULL;
579         if (fibh->sbh != fibh->ebh)
580                 brelse(fibh->ebh);
581         brelse(fibh->sbh);
582 out_ok:
583         brelse(epos.bh);
584         kfree(name);
585         return fi;
586 }
587 
588 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
589                             struct udf_fileident_bh *fibh,
590                             struct fileIdentDesc *cfi)
591 {
592         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
593 
594         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
595                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
596 
597         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
598 }
599 
600 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
601 {
602         struct udf_inode_info *iinfo = UDF_I(inode);
603         struct inode *dir = d_inode(dentry->d_parent);
604         struct udf_fileident_bh fibh;
605         struct fileIdentDesc cfi, *fi;
606         int err;
607 
608         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
609         if (unlikely(!fi)) {
610                 inode_dec_link_count(inode);
611                 unlock_new_inode(inode);
612                 iput(inode);
613                 return err;
614         }
615         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
616         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
617         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
618                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
619         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
620         dir->i_ctime = dir->i_mtime = current_time(dir);
621         mark_inode_dirty(dir);
622         if (fibh.sbh != fibh.ebh)
623                 brelse(fibh.ebh);
624         brelse(fibh.sbh);
625         d_instantiate_new(dentry, inode);
626 
627         return 0;
628 }
629 
630 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
631                       bool excl)
632 {
633         struct inode *inode = udf_new_inode(dir, mode);
634 
635         if (IS_ERR(inode))
636                 return PTR_ERR(inode);
637 
638         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
639                 inode->i_data.a_ops = &udf_adinicb_aops;
640         else
641                 inode->i_data.a_ops = &udf_aops;
642         inode->i_op = &udf_file_inode_operations;
643         inode->i_fop = &udf_file_operations;
644         mark_inode_dirty(inode);
645 
646         return udf_add_nondir(dentry, inode);
647 }
648 
649 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
650 {
651         struct inode *inode = udf_new_inode(dir, mode);
652 
653         if (IS_ERR(inode))
654                 return PTR_ERR(inode);
655 
656         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
657                 inode->i_data.a_ops = &udf_adinicb_aops;
658         else
659                 inode->i_data.a_ops = &udf_aops;
660         inode->i_op = &udf_file_inode_operations;
661         inode->i_fop = &udf_file_operations;
662         mark_inode_dirty(inode);
663         d_tmpfile(dentry, inode);
664         unlock_new_inode(inode);
665         return 0;
666 }
667 
668 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
669                      dev_t rdev)
670 {
671         struct inode *inode;
672 
673         if (!old_valid_dev(rdev))
674                 return -EINVAL;
675 
676         inode = udf_new_inode(dir, mode);
677         if (IS_ERR(inode))
678                 return PTR_ERR(inode);
679 
680         init_special_inode(inode, mode, rdev);
681         return udf_add_nondir(dentry, inode);
682 }
683 
684 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
685 {
686         struct inode *inode;
687         struct udf_fileident_bh fibh;
688         struct fileIdentDesc cfi, *fi;
689         int err;
690         struct udf_inode_info *dinfo = UDF_I(dir);
691         struct udf_inode_info *iinfo;
692 
693         inode = udf_new_inode(dir, S_IFDIR | mode);
694         if (IS_ERR(inode))
695                 return PTR_ERR(inode);
696 
697         iinfo = UDF_I(inode);
698         inode->i_op = &udf_dir_inode_operations;
699         inode->i_fop = &udf_dir_operations;
700         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
701         if (!fi) {
702                 inode_dec_link_count(inode);
703                 unlock_new_inode(inode);
704                 iput(inode);
705                 goto out;
706         }
707         set_nlink(inode, 2);
708         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
709         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
710         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
711                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
712         cfi.fileCharacteristics =
713                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
714         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
715         brelse(fibh.sbh);
716         mark_inode_dirty(inode);
717 
718         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
719         if (!fi) {
720                 clear_nlink(inode);
721                 mark_inode_dirty(inode);
722                 unlock_new_inode(inode);
723                 iput(inode);
724                 goto out;
725         }
726         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
727         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
728         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
729                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
730         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
731         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
732         inc_nlink(dir);
733         dir->i_ctime = dir->i_mtime = current_time(dir);
734         mark_inode_dirty(dir);
735         d_instantiate_new(dentry, inode);
736         if (fibh.sbh != fibh.ebh)
737                 brelse(fibh.ebh);
738         brelse(fibh.sbh);
739         err = 0;
740 
741 out:
742         return err;
743 }
744 
745 static int empty_dir(struct inode *dir)
746 {
747         struct fileIdentDesc *fi, cfi;
748         struct udf_fileident_bh fibh;
749         loff_t f_pos;
750         loff_t size = udf_ext0_offset(dir) + dir->i_size;
751         udf_pblk_t block;
752         struct kernel_lb_addr eloc;
753         uint32_t elen;
754         sector_t offset;
755         struct extent_position epos = {};
756         struct udf_inode_info *dinfo = UDF_I(dir);
757 
758         f_pos = udf_ext0_offset(dir);
759         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
760 
761         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
762                 fibh.sbh = fibh.ebh = NULL;
763         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
764                               &epos, &eloc, &elen, &offset) ==
765                                         (EXT_RECORDED_ALLOCATED >> 30)) {
766                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
767                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
768                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
769                                 epos.offset -= sizeof(struct short_ad);
770                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
771                                 epos.offset -= sizeof(struct long_ad);
772                 } else
773                         offset = 0;
774 
775                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
776                 if (!fibh.sbh) {
777                         brelse(epos.bh);
778                         return 0;
779                 }
780         } else {
781                 brelse(epos.bh);
782                 return 0;
783         }
784 
785         while (f_pos < size) {
786                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
787                                         &elen, &offset);
788                 if (!fi) {
789                         if (fibh.sbh != fibh.ebh)
790                                 brelse(fibh.ebh);
791                         brelse(fibh.sbh);
792                         brelse(epos.bh);
793                         return 0;
794                 }
795 
796                 if (cfi.lengthFileIdent &&
797                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
798                         if (fibh.sbh != fibh.ebh)
799                                 brelse(fibh.ebh);
800                         brelse(fibh.sbh);
801                         brelse(epos.bh);
802                         return 0;
803                 }
804         }
805 
806         if (fibh.sbh != fibh.ebh)
807                 brelse(fibh.ebh);
808         brelse(fibh.sbh);
809         brelse(epos.bh);
810 
811         return 1;
812 }
813 
814 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
815 {
816         int retval;
817         struct inode *inode = d_inode(dentry);
818         struct udf_fileident_bh fibh;
819         struct fileIdentDesc *fi, cfi;
820         struct kernel_lb_addr tloc;
821 
822         retval = -ENOENT;
823         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
824         if (IS_ERR_OR_NULL(fi)) {
825                 if (fi)
826                         retval = PTR_ERR(fi);
827                 goto out;
828         }
829 
830         retval = -EIO;
831         tloc = lelb_to_cpu(cfi.icb.extLocation);
832         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
833                 goto end_rmdir;
834         retval = -ENOTEMPTY;
835         if (!empty_dir(inode))
836                 goto end_rmdir;
837         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
838         if (retval)
839                 goto end_rmdir;
840         if (inode->i_nlink != 2)
841                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
842                          inode->i_nlink);
843         clear_nlink(inode);
844         inode->i_size = 0;
845         inode_dec_link_count(dir);
846         inode->i_ctime = dir->i_ctime = dir->i_mtime =
847                                                 current_time(inode);
848         mark_inode_dirty(dir);
849 
850 end_rmdir:
851         if (fibh.sbh != fibh.ebh)
852                 brelse(fibh.ebh);
853         brelse(fibh.sbh);
854 
855 out:
856         return retval;
857 }
858 
859 static int udf_unlink(struct inode *dir, struct dentry *dentry)
860 {
861         int retval;
862         struct inode *inode = d_inode(dentry);
863         struct udf_fileident_bh fibh;
864         struct fileIdentDesc *fi;
865         struct fileIdentDesc cfi;
866         struct kernel_lb_addr tloc;
867 
868         retval = -ENOENT;
869         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
870 
871         if (IS_ERR_OR_NULL(fi)) {
872                 if (fi)
873                         retval = PTR_ERR(fi);
874                 goto out;
875         }
876 
877         retval = -EIO;
878         tloc = lelb_to_cpu(cfi.icb.extLocation);
879         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
880                 goto end_unlink;
881 
882         if (!inode->i_nlink) {
883                 udf_debug("Deleting nonexistent file (%lu), %u\n",
884                           inode->i_ino, inode->i_nlink);
885                 set_nlink(inode, 1);
886         }
887         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
888         if (retval)
889                 goto end_unlink;
890         dir->i_ctime = dir->i_mtime = current_time(dir);
891         mark_inode_dirty(dir);
892         inode_dec_link_count(inode);
893         inode->i_ctime = dir->i_ctime;
894         retval = 0;
895 
896 end_unlink:
897         if (fibh.sbh != fibh.ebh)
898                 brelse(fibh.ebh);
899         brelse(fibh.sbh);
900 
901 out:
902         return retval;
903 }
904 
905 static int udf_symlink(struct inode *dir, struct dentry *dentry,
906                        const char *symname)
907 {
908         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
909         struct pathComponent *pc;
910         const char *compstart;
911         struct extent_position epos = {};
912         int eoffset, elen = 0;
913         uint8_t *ea;
914         int err;
915         udf_pblk_t block;
916         unsigned char *name = NULL;
917         int namelen;
918         struct udf_inode_info *iinfo;
919         struct super_block *sb = dir->i_sb;
920 
921         if (IS_ERR(inode))
922                 return PTR_ERR(inode);
923 
924         iinfo = UDF_I(inode);
925         down_write(&iinfo->i_data_sem);
926         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
927         if (!name) {
928                 err = -ENOMEM;
929                 goto out_no_entry;
930         }
931 
932         inode->i_data.a_ops = &udf_symlink_aops;
933         inode->i_op = &udf_symlink_inode_operations;
934         inode_nohighmem(inode);
935 
936         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
937                 struct kernel_lb_addr eloc;
938                 uint32_t bsize;
939 
940                 block = udf_new_block(sb, inode,
941                                 iinfo->i_location.partitionReferenceNum,
942                                 iinfo->i_location.logicalBlockNum, &err);
943                 if (!block)
944                         goto out_no_entry;
945                 epos.block = iinfo->i_location;
946                 epos.offset = udf_file_entry_alloc_offset(inode);
947                 epos.bh = NULL;
948                 eloc.logicalBlockNum = block;
949                 eloc.partitionReferenceNum =
950                                 iinfo->i_location.partitionReferenceNum;
951                 bsize = sb->s_blocksize;
952                 iinfo->i_lenExtents = bsize;
953                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
954                 brelse(epos.bh);
955 
956                 block = udf_get_pblock(sb, block,
957                                 iinfo->i_location.partitionReferenceNum,
958                                 0);
959                 epos.bh = udf_tgetblk(sb, block);
960                 lock_buffer(epos.bh);
961                 memset(epos.bh->b_data, 0x00, bsize);
962                 set_buffer_uptodate(epos.bh);
963                 unlock_buffer(epos.bh);
964                 mark_buffer_dirty_inode(epos.bh, inode);
965                 ea = epos.bh->b_data + udf_ext0_offset(inode);
966         } else
967                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
968 
969         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
970         pc = (struct pathComponent *)ea;
971 
972         if (*symname == '/') {
973                 do {
974                         symname++;
975                 } while (*symname == '/');
976 
977                 pc->componentType = 1;
978                 pc->lengthComponentIdent = 0;
979                 pc->componentFileVersionNum = 0;
980                 elen += sizeof(struct pathComponent);
981         }
982 
983         err = -ENAMETOOLONG;
984 
985         while (*symname) {
986                 if (elen + sizeof(struct pathComponent) > eoffset)
987                         goto out_no_entry;
988 
989                 pc = (struct pathComponent *)(ea + elen);
990 
991                 compstart = symname;
992 
993                 do {
994                         symname++;
995                 } while (*symname && *symname != '/');
996 
997                 pc->componentType = 5;
998                 pc->lengthComponentIdent = 0;
999                 pc->componentFileVersionNum = 0;
1000                 if (compstart[0] == '.') {
1001                         if ((symname - compstart) == 1)
1002                                 pc->componentType = 4;
1003                         else if ((symname - compstart) == 2 &&
1004                                         compstart[1] == '.')
1005                                 pc->componentType = 3;
1006                 }
1007 
1008                 if (pc->componentType == 5) {
1009                         namelen = udf_put_filename(sb, compstart,
1010                                                    symname - compstart,
1011                                                    name, UDF_NAME_LEN_CS0);
1012                         if (!namelen)
1013                                 goto out_no_entry;
1014 
1015                         if (elen + sizeof(struct pathComponent) + namelen >
1016                                         eoffset)
1017                                 goto out_no_entry;
1018                         else
1019                                 pc->lengthComponentIdent = namelen;
1020 
1021                         memcpy(pc->componentIdent, name, namelen);
1022                 }
1023 
1024                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1025 
1026                 if (*symname) {
1027                         do {
1028                                 symname++;
1029                         } while (*symname == '/');
1030                 }
1031         }
1032 
1033         brelse(epos.bh);
1034         inode->i_size = elen;
1035         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1036                 iinfo->i_lenAlloc = inode->i_size;
1037         else
1038                 udf_truncate_tail_extent(inode);
1039         mark_inode_dirty(inode);
1040         up_write(&iinfo->i_data_sem);
1041 
1042         err = udf_add_nondir(dentry, inode);
1043 out:
1044         kfree(name);
1045         return err;
1046 
1047 out_no_entry:
1048         up_write(&iinfo->i_data_sem);
1049         inode_dec_link_count(inode);
1050         unlock_new_inode(inode);
1051         iput(inode);
1052         goto out;
1053 }
1054 
1055 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1056                     struct dentry *dentry)
1057 {
1058         struct inode *inode = d_inode(old_dentry);
1059         struct udf_fileident_bh fibh;
1060         struct fileIdentDesc cfi, *fi;
1061         int err;
1062 
1063         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1064         if (!fi) {
1065                 return err;
1066         }
1067         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1068         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1069         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1070                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1071                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1072         }
1073         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1074         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1075                 mark_inode_dirty(dir);
1076 
1077         if (fibh.sbh != fibh.ebh)
1078                 brelse(fibh.ebh);
1079         brelse(fibh.sbh);
1080         inc_nlink(inode);
1081         inode->i_ctime = current_time(inode);
1082         mark_inode_dirty(inode);
1083         dir->i_ctime = dir->i_mtime = current_time(dir);
1084         mark_inode_dirty(dir);
1085         ihold(inode);
1086         d_instantiate(dentry, inode);
1087 
1088         return 0;
1089 }
1090 
1091 /* Anybody can rename anything with this: the permission checks are left to the
1092  * higher-level routines.
1093  */
1094 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1095                       struct inode *new_dir, struct dentry *new_dentry,
1096                       unsigned int flags)
1097 {
1098         struct inode *old_inode = d_inode(old_dentry);
1099         struct inode *new_inode = d_inode(new_dentry);
1100         struct udf_fileident_bh ofibh, nfibh;
1101         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1102         struct fileIdentDesc ocfi, ncfi;
1103         struct buffer_head *dir_bh = NULL;
1104         int retval = -ENOENT;
1105         struct kernel_lb_addr tloc;
1106         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1107 
1108         if (flags & ~RENAME_NOREPLACE)
1109                 return -EINVAL;
1110 
1111         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1112         if (IS_ERR(ofi)) {
1113                 retval = PTR_ERR(ofi);
1114                 goto end_rename;
1115         }
1116 
1117         if (ofibh.sbh != ofibh.ebh)
1118                 brelse(ofibh.ebh);
1119 
1120         brelse(ofibh.sbh);
1121         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1122         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1123             != old_inode->i_ino)
1124                 goto end_rename;
1125 
1126         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1127         if (IS_ERR(nfi)) {
1128                 retval = PTR_ERR(nfi);
1129                 goto end_rename;
1130         }
1131         if (nfi && !new_inode) {
1132                 if (nfibh.sbh != nfibh.ebh)
1133                         brelse(nfibh.ebh);
1134                 brelse(nfibh.sbh);
1135                 nfi = NULL;
1136         }
1137         if (S_ISDIR(old_inode->i_mode)) {
1138                 int offset = udf_ext0_offset(old_inode);
1139 
1140                 if (new_inode) {
1141                         retval = -ENOTEMPTY;
1142                         if (!empty_dir(new_inode))
1143                                 goto end_rename;
1144                 }
1145                 retval = -EIO;
1146                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1147                         dir_fi = udf_get_fileident(
1148                                         old_iinfo->i_ext.i_data -
1149                                           (old_iinfo->i_efe ?
1150                                            sizeof(struct extendedFileEntry) :
1151                                            sizeof(struct fileEntry)),
1152                                         old_inode->i_sb->s_blocksize, &offset);
1153                 } else {
1154                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1155                         if (!dir_bh)
1156                                 goto end_rename;
1157                         dir_fi = udf_get_fileident(dir_bh->b_data,
1158                                         old_inode->i_sb->s_blocksize, &offset);
1159                 }
1160                 if (!dir_fi)
1161                         goto end_rename;
1162                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1163                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1164                                 old_dir->i_ino)
1165                         goto end_rename;
1166         }
1167         if (!nfi) {
1168                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1169                                     &retval);
1170                 if (!nfi)
1171                         goto end_rename;
1172         }
1173 
1174         /*
1175          * Like most other Unix systems, set the ctime for inodes on a
1176          * rename.
1177          */
1178         old_inode->i_ctime = current_time(old_inode);
1179         mark_inode_dirty(old_inode);
1180 
1181         /*
1182          * ok, that's it
1183          */
1184         ncfi.fileVersionNum = ocfi.fileVersionNum;
1185         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1186         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1187         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1188 
1189         /* The old fid may have moved - find it again */
1190         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1191         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1192 
1193         if (new_inode) {
1194                 new_inode->i_ctime = current_time(new_inode);
1195                 inode_dec_link_count(new_inode);
1196         }
1197         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1198         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1199         mark_inode_dirty(old_dir);
1200         mark_inode_dirty(new_dir);
1201 
1202         if (dir_fi) {
1203                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1204                 udf_update_tag((char *)dir_fi,
1205                                 (sizeof(struct fileIdentDesc) +
1206                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1207                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1208                         mark_inode_dirty(old_inode);
1209                 else
1210                         mark_buffer_dirty_inode(dir_bh, old_inode);
1211 
1212                 inode_dec_link_count(old_dir);
1213                 if (new_inode)
1214                         inode_dec_link_count(new_inode);
1215                 else {
1216                         inc_nlink(new_dir);
1217                         mark_inode_dirty(new_dir);
1218                 }
1219         }
1220 
1221         if (ofi) {
1222                 if (ofibh.sbh != ofibh.ebh)
1223                         brelse(ofibh.ebh);
1224                 brelse(ofibh.sbh);
1225         }
1226 
1227         retval = 0;
1228 
1229 end_rename:
1230         brelse(dir_bh);
1231         if (nfi) {
1232                 if (nfibh.sbh != nfibh.ebh)
1233                         brelse(nfibh.ebh);
1234                 brelse(nfibh.sbh);
1235         }
1236 
1237         return retval;
1238 }
1239 
1240 static struct dentry *udf_get_parent(struct dentry *child)
1241 {
1242         struct kernel_lb_addr tloc;
1243         struct inode *inode = NULL;
1244         struct qstr dotdot = QSTR_INIT("..", 2);
1245         struct fileIdentDesc cfi;
1246         struct udf_fileident_bh fibh;
1247 
1248         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1249                 return ERR_PTR(-EACCES);
1250 
1251         if (fibh.sbh != fibh.ebh)
1252                 brelse(fibh.ebh);
1253         brelse(fibh.sbh);
1254 
1255         tloc = lelb_to_cpu(cfi.icb.extLocation);
1256         inode = udf_iget(child->d_sb, &tloc);
1257         if (IS_ERR(inode))
1258                 return ERR_CAST(inode);
1259 
1260         return d_obtain_alias(inode);
1261 }
1262 
1263 
1264 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1265                                         u16 partref, __u32 generation)
1266 {
1267         struct inode *inode;
1268         struct kernel_lb_addr loc;
1269 
1270         if (block == 0)
1271                 return ERR_PTR(-ESTALE);
1272 
1273         loc.logicalBlockNum = block;
1274         loc.partitionReferenceNum = partref;
1275         inode = udf_iget(sb, &loc);
1276 
1277         if (IS_ERR(inode))
1278                 return ERR_CAST(inode);
1279 
1280         if (generation && inode->i_generation != generation) {
1281                 iput(inode);
1282                 return ERR_PTR(-ESTALE);
1283         }
1284         return d_obtain_alias(inode);
1285 }
1286 
1287 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1288                                        struct fid *fid, int fh_len, int fh_type)
1289 {
1290         if (fh_len < 3 ||
1291             (fh_type != FILEID_UDF_WITH_PARENT &&
1292              fh_type != FILEID_UDF_WITHOUT_PARENT))
1293                 return NULL;
1294 
1295         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1296                         fid->udf.generation);
1297 }
1298 
1299 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1300                                        struct fid *fid, int fh_len, int fh_type)
1301 {
1302         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1303                 return NULL;
1304 
1305         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1306                                  fid->udf.parent_partref,
1307                                  fid->udf.parent_generation);
1308 }
1309 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1310                          struct inode *parent)
1311 {
1312         int len = *lenp;
1313         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1314         struct fid *fid = (struct fid *)fh;
1315         int type = FILEID_UDF_WITHOUT_PARENT;
1316 
1317         if (parent && (len < 5)) {
1318                 *lenp = 5;
1319                 return FILEID_INVALID;
1320         } else if (len < 3) {
1321                 *lenp = 3;
1322                 return FILEID_INVALID;
1323         }
1324 
1325         *lenp = 3;
1326         fid->udf.block = location.logicalBlockNum;
1327         fid->udf.partref = location.partitionReferenceNum;
1328         fid->udf.parent_partref = 0;
1329         fid->udf.generation = inode->i_generation;
1330 
1331         if (parent) {
1332                 location = UDF_I(parent)->i_location;
1333                 fid->udf.parent_block = location.logicalBlockNum;
1334                 fid->udf.parent_partref = location.partitionReferenceNum;
1335                 fid->udf.parent_generation = inode->i_generation;
1336                 *lenp = 5;
1337                 type = FILEID_UDF_WITH_PARENT;
1338         }
1339 
1340         return type;
1341 }
1342 
1343 const struct export_operations udf_export_ops = {
1344         .encode_fh      = udf_encode_fh,
1345         .fh_to_dentry   = udf_fh_to_dentry,
1346         .fh_to_parent   = udf_fh_to_parent,
1347         .get_parent     = udf_get_parent,
1348 };
1349 
1350 const struct inode_operations udf_dir_inode_operations = {
1351         .lookup                         = udf_lookup,
1352         .create                         = udf_create,
1353         .link                           = udf_link,
1354         .unlink                         = udf_unlink,
1355         .symlink                        = udf_symlink,
1356         .mkdir                          = udf_mkdir,
1357         .rmdir                          = udf_rmdir,
1358         .mknod                          = udf_mknod,
1359         .rename                         = udf_rename,
1360         .tmpfile                        = udf_tmpfile,
1361 };
1362 

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