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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         unlock_new_inode(inode);
626         d_instantiate(dentry, inode);
627 
628         return 0;
629 }
630 
631 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
632                       bool excl)
633 {
634         struct inode *inode = udf_new_inode(dir, mode);
635 
636         if (IS_ERR(inode))
637                 return PTR_ERR(inode);
638 
639         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
640                 inode->i_data.a_ops = &udf_adinicb_aops;
641         else
642                 inode->i_data.a_ops = &udf_aops;
643         inode->i_op = &udf_file_inode_operations;
644         inode->i_fop = &udf_file_operations;
645         mark_inode_dirty(inode);
646 
647         return udf_add_nondir(dentry, inode);
648 }
649 
650 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
651 {
652         struct inode *inode = udf_new_inode(dir, mode);
653 
654         if (IS_ERR(inode))
655                 return PTR_ERR(inode);
656 
657         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
658                 inode->i_data.a_ops = &udf_adinicb_aops;
659         else
660                 inode->i_data.a_ops = &udf_aops;
661         inode->i_op = &udf_file_inode_operations;
662         inode->i_fop = &udf_file_operations;
663         mark_inode_dirty(inode);
664         d_tmpfile(dentry, inode);
665         unlock_new_inode(inode);
666         return 0;
667 }
668 
669 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
670                      dev_t rdev)
671 {
672         struct inode *inode;
673 
674         if (!old_valid_dev(rdev))
675                 return -EINVAL;
676 
677         inode = udf_new_inode(dir, mode);
678         if (IS_ERR(inode))
679                 return PTR_ERR(inode);
680 
681         init_special_inode(inode, mode, rdev);
682         return udf_add_nondir(dentry, inode);
683 }
684 
685 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
686 {
687         struct inode *inode;
688         struct udf_fileident_bh fibh;
689         struct fileIdentDesc cfi, *fi;
690         int err;
691         struct udf_inode_info *dinfo = UDF_I(dir);
692         struct udf_inode_info *iinfo;
693 
694         inode = udf_new_inode(dir, S_IFDIR | mode);
695         if (IS_ERR(inode))
696                 return PTR_ERR(inode);
697 
698         iinfo = UDF_I(inode);
699         inode->i_op = &udf_dir_inode_operations;
700         inode->i_fop = &udf_dir_operations;
701         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
702         if (!fi) {
703                 inode_dec_link_count(inode);
704                 unlock_new_inode(inode);
705                 iput(inode);
706                 goto out;
707         }
708         set_nlink(inode, 2);
709         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
710         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
711         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
712                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
713         cfi.fileCharacteristics =
714                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
715         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
716         brelse(fibh.sbh);
717         mark_inode_dirty(inode);
718 
719         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
720         if (!fi) {
721                 clear_nlink(inode);
722                 mark_inode_dirty(inode);
723                 unlock_new_inode(inode);
724                 iput(inode);
725                 goto out;
726         }
727         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
728         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
729         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
730                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
731         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
732         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
733         inc_nlink(dir);
734         dir->i_ctime = dir->i_mtime = current_time(dir);
735         mark_inode_dirty(dir);
736         unlock_new_inode(inode);
737         d_instantiate(dentry, inode);
738         if (fibh.sbh != fibh.ebh)
739                 brelse(fibh.ebh);
740         brelse(fibh.sbh);
741         err = 0;
742 
743 out:
744         return err;
745 }
746 
747 static int empty_dir(struct inode *dir)
748 {
749         struct fileIdentDesc *fi, cfi;
750         struct udf_fileident_bh fibh;
751         loff_t f_pos;
752         loff_t size = udf_ext0_offset(dir) + dir->i_size;
753         udf_pblk_t block;
754         struct kernel_lb_addr eloc;
755         uint32_t elen;
756         sector_t offset;
757         struct extent_position epos = {};
758         struct udf_inode_info *dinfo = UDF_I(dir);
759 
760         f_pos = udf_ext0_offset(dir);
761         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
762 
763         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
764                 fibh.sbh = fibh.ebh = NULL;
765         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
766                               &epos, &eloc, &elen, &offset) ==
767                                         (EXT_RECORDED_ALLOCATED >> 30)) {
768                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
769                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
770                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
771                                 epos.offset -= sizeof(struct short_ad);
772                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
773                                 epos.offset -= sizeof(struct long_ad);
774                 } else
775                         offset = 0;
776 
777                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
778                 if (!fibh.sbh) {
779                         brelse(epos.bh);
780                         return 0;
781                 }
782         } else {
783                 brelse(epos.bh);
784                 return 0;
785         }
786 
787         while (f_pos < size) {
788                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
789                                         &elen, &offset);
790                 if (!fi) {
791                         if (fibh.sbh != fibh.ebh)
792                                 brelse(fibh.ebh);
793                         brelse(fibh.sbh);
794                         brelse(epos.bh);
795                         return 0;
796                 }
797 
798                 if (cfi.lengthFileIdent &&
799                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
800                         if (fibh.sbh != fibh.ebh)
801                                 brelse(fibh.ebh);
802                         brelse(fibh.sbh);
803                         brelse(epos.bh);
804                         return 0;
805                 }
806         }
807 
808         if (fibh.sbh != fibh.ebh)
809                 brelse(fibh.ebh);
810         brelse(fibh.sbh);
811         brelse(epos.bh);
812 
813         return 1;
814 }
815 
816 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
817 {
818         int retval;
819         struct inode *inode = d_inode(dentry);
820         struct udf_fileident_bh fibh;
821         struct fileIdentDesc *fi, cfi;
822         struct kernel_lb_addr tloc;
823 
824         retval = -ENOENT;
825         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
826         if (IS_ERR_OR_NULL(fi)) {
827                 if (fi)
828                         retval = PTR_ERR(fi);
829                 goto out;
830         }
831 
832         retval = -EIO;
833         tloc = lelb_to_cpu(cfi.icb.extLocation);
834         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
835                 goto end_rmdir;
836         retval = -ENOTEMPTY;
837         if (!empty_dir(inode))
838                 goto end_rmdir;
839         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
840         if (retval)
841                 goto end_rmdir;
842         if (inode->i_nlink != 2)
843                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
844                          inode->i_nlink);
845         clear_nlink(inode);
846         inode->i_size = 0;
847         inode_dec_link_count(dir);
848         inode->i_ctime = dir->i_ctime = dir->i_mtime =
849                                                 current_time(inode);
850         mark_inode_dirty(dir);
851 
852 end_rmdir:
853         if (fibh.sbh != fibh.ebh)
854                 brelse(fibh.ebh);
855         brelse(fibh.sbh);
856 
857 out:
858         return retval;
859 }
860 
861 static int udf_unlink(struct inode *dir, struct dentry *dentry)
862 {
863         int retval;
864         struct inode *inode = d_inode(dentry);
865         struct udf_fileident_bh fibh;
866         struct fileIdentDesc *fi;
867         struct fileIdentDesc cfi;
868         struct kernel_lb_addr tloc;
869 
870         retval = -ENOENT;
871         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
872 
873         if (IS_ERR_OR_NULL(fi)) {
874                 if (fi)
875                         retval = PTR_ERR(fi);
876                 goto out;
877         }
878 
879         retval = -EIO;
880         tloc = lelb_to_cpu(cfi.icb.extLocation);
881         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
882                 goto end_unlink;
883 
884         if (!inode->i_nlink) {
885                 udf_debug("Deleting nonexistent file (%lu), %u\n",
886                           inode->i_ino, inode->i_nlink);
887                 set_nlink(inode, 1);
888         }
889         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
890         if (retval)
891                 goto end_unlink;
892         dir->i_ctime = dir->i_mtime = current_time(dir);
893         mark_inode_dirty(dir);
894         inode_dec_link_count(inode);
895         inode->i_ctime = dir->i_ctime;
896         retval = 0;
897 
898 end_unlink:
899         if (fibh.sbh != fibh.ebh)
900                 brelse(fibh.ebh);
901         brelse(fibh.sbh);
902 
903 out:
904         return retval;
905 }
906 
907 static int udf_symlink(struct inode *dir, struct dentry *dentry,
908                        const char *symname)
909 {
910         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
911         struct pathComponent *pc;
912         const char *compstart;
913         struct extent_position epos = {};
914         int eoffset, elen = 0;
915         uint8_t *ea;
916         int err;
917         udf_pblk_t block;
918         unsigned char *name = NULL;
919         int namelen;
920         struct udf_inode_info *iinfo;
921         struct super_block *sb = dir->i_sb;
922 
923         if (IS_ERR(inode))
924                 return PTR_ERR(inode);
925 
926         iinfo = UDF_I(inode);
927         down_write(&iinfo->i_data_sem);
928         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
929         if (!name) {
930                 err = -ENOMEM;
931                 goto out_no_entry;
932         }
933 
934         inode->i_data.a_ops = &udf_symlink_aops;
935         inode->i_op = &udf_symlink_inode_operations;
936         inode_nohighmem(inode);
937 
938         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
939                 struct kernel_lb_addr eloc;
940                 uint32_t bsize;
941 
942                 block = udf_new_block(sb, inode,
943                                 iinfo->i_location.partitionReferenceNum,
944                                 iinfo->i_location.logicalBlockNum, &err);
945                 if (!block)
946                         goto out_no_entry;
947                 epos.block = iinfo->i_location;
948                 epos.offset = udf_file_entry_alloc_offset(inode);
949                 epos.bh = NULL;
950                 eloc.logicalBlockNum = block;
951                 eloc.partitionReferenceNum =
952                                 iinfo->i_location.partitionReferenceNum;
953                 bsize = sb->s_blocksize;
954                 iinfo->i_lenExtents = bsize;
955                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
956                 brelse(epos.bh);
957 
958                 block = udf_get_pblock(sb, block,
959                                 iinfo->i_location.partitionReferenceNum,
960                                 0);
961                 epos.bh = udf_tgetblk(sb, block);
962                 lock_buffer(epos.bh);
963                 memset(epos.bh->b_data, 0x00, bsize);
964                 set_buffer_uptodate(epos.bh);
965                 unlock_buffer(epos.bh);
966                 mark_buffer_dirty_inode(epos.bh, inode);
967                 ea = epos.bh->b_data + udf_ext0_offset(inode);
968         } else
969                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
970 
971         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
972         pc = (struct pathComponent *)ea;
973 
974         if (*symname == '/') {
975                 do {
976                         symname++;
977                 } while (*symname == '/');
978 
979                 pc->componentType = 1;
980                 pc->lengthComponentIdent = 0;
981                 pc->componentFileVersionNum = 0;
982                 elen += sizeof(struct pathComponent);
983         }
984 
985         err = -ENAMETOOLONG;
986 
987         while (*symname) {
988                 if (elen + sizeof(struct pathComponent) > eoffset)
989                         goto out_no_entry;
990 
991                 pc = (struct pathComponent *)(ea + elen);
992 
993                 compstart = symname;
994 
995                 do {
996                         symname++;
997                 } while (*symname && *symname != '/');
998 
999                 pc->componentType = 5;
1000                 pc->lengthComponentIdent = 0;
1001                 pc->componentFileVersionNum = 0;
1002                 if (compstart[0] == '.') {
1003                         if ((symname - compstart) == 1)
1004                                 pc->componentType = 4;
1005                         else if ((symname - compstart) == 2 &&
1006                                         compstart[1] == '.')
1007                                 pc->componentType = 3;
1008                 }
1009 
1010                 if (pc->componentType == 5) {
1011                         namelen = udf_put_filename(sb, compstart,
1012                                                    symname - compstart,
1013                                                    name, UDF_NAME_LEN_CS0);
1014                         if (!namelen)
1015                                 goto out_no_entry;
1016 
1017                         if (elen + sizeof(struct pathComponent) + namelen >
1018                                         eoffset)
1019                                 goto out_no_entry;
1020                         else
1021                                 pc->lengthComponentIdent = namelen;
1022 
1023                         memcpy(pc->componentIdent, name, namelen);
1024                 }
1025 
1026                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1027 
1028                 if (*symname) {
1029                         do {
1030                                 symname++;
1031                         } while (*symname == '/');
1032                 }
1033         }
1034 
1035         brelse(epos.bh);
1036         inode->i_size = elen;
1037         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1038                 iinfo->i_lenAlloc = inode->i_size;
1039         else
1040                 udf_truncate_tail_extent(inode);
1041         mark_inode_dirty(inode);
1042         up_write(&iinfo->i_data_sem);
1043 
1044         err = udf_add_nondir(dentry, inode);
1045 out:
1046         kfree(name);
1047         return err;
1048 
1049 out_no_entry:
1050         up_write(&iinfo->i_data_sem);
1051         inode_dec_link_count(inode);
1052         unlock_new_inode(inode);
1053         iput(inode);
1054         goto out;
1055 }
1056 
1057 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1058                     struct dentry *dentry)
1059 {
1060         struct inode *inode = d_inode(old_dentry);
1061         struct udf_fileident_bh fibh;
1062         struct fileIdentDesc cfi, *fi;
1063         int err;
1064 
1065         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1066         if (!fi) {
1067                 return err;
1068         }
1069         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1070         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1071         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1072                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1073                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1074         }
1075         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1076         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1077                 mark_inode_dirty(dir);
1078 
1079         if (fibh.sbh != fibh.ebh)
1080                 brelse(fibh.ebh);
1081         brelse(fibh.sbh);
1082         inc_nlink(inode);
1083         inode->i_ctime = current_time(inode);
1084         mark_inode_dirty(inode);
1085         dir->i_ctime = dir->i_mtime = current_time(dir);
1086         mark_inode_dirty(dir);
1087         ihold(inode);
1088         d_instantiate(dentry, inode);
1089 
1090         return 0;
1091 }
1092 
1093 /* Anybody can rename anything with this: the permission checks are left to the
1094  * higher-level routines.
1095  */
1096 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1097                       struct inode *new_dir, struct dentry *new_dentry,
1098                       unsigned int flags)
1099 {
1100         struct inode *old_inode = d_inode(old_dentry);
1101         struct inode *new_inode = d_inode(new_dentry);
1102         struct udf_fileident_bh ofibh, nfibh;
1103         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1104         struct fileIdentDesc ocfi, ncfi;
1105         struct buffer_head *dir_bh = NULL;
1106         int retval = -ENOENT;
1107         struct kernel_lb_addr tloc;
1108         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1109 
1110         if (flags & ~RENAME_NOREPLACE)
1111                 return -EINVAL;
1112 
1113         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1114         if (IS_ERR(ofi)) {
1115                 retval = PTR_ERR(ofi);
1116                 goto end_rename;
1117         }
1118 
1119         if (ofibh.sbh != ofibh.ebh)
1120                 brelse(ofibh.ebh);
1121 
1122         brelse(ofibh.sbh);
1123         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1124         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1125             != old_inode->i_ino)
1126                 goto end_rename;
1127 
1128         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1129         if (IS_ERR(nfi)) {
1130                 retval = PTR_ERR(nfi);
1131                 goto end_rename;
1132         }
1133         if (nfi && !new_inode) {
1134                 if (nfibh.sbh != nfibh.ebh)
1135                         brelse(nfibh.ebh);
1136                 brelse(nfibh.sbh);
1137                 nfi = NULL;
1138         }
1139         if (S_ISDIR(old_inode->i_mode)) {
1140                 int offset = udf_ext0_offset(old_inode);
1141 
1142                 if (new_inode) {
1143                         retval = -ENOTEMPTY;
1144                         if (!empty_dir(new_inode))
1145                                 goto end_rename;
1146                 }
1147                 retval = -EIO;
1148                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1149                         dir_fi = udf_get_fileident(
1150                                         old_iinfo->i_ext.i_data -
1151                                           (old_iinfo->i_efe ?
1152                                            sizeof(struct extendedFileEntry) :
1153                                            sizeof(struct fileEntry)),
1154                                         old_inode->i_sb->s_blocksize, &offset);
1155                 } else {
1156                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1157                         if (!dir_bh)
1158                                 goto end_rename;
1159                         dir_fi = udf_get_fileident(dir_bh->b_data,
1160                                         old_inode->i_sb->s_blocksize, &offset);
1161                 }
1162                 if (!dir_fi)
1163                         goto end_rename;
1164                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1165                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1166                                 old_dir->i_ino)
1167                         goto end_rename;
1168         }
1169         if (!nfi) {
1170                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1171                                     &retval);
1172                 if (!nfi)
1173                         goto end_rename;
1174         }
1175 
1176         /*
1177          * Like most other Unix systems, set the ctime for inodes on a
1178          * rename.
1179          */
1180         old_inode->i_ctime = current_time(old_inode);
1181         mark_inode_dirty(old_inode);
1182 
1183         /*
1184          * ok, that's it
1185          */
1186         ncfi.fileVersionNum = ocfi.fileVersionNum;
1187         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1188         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1189         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1190 
1191         /* The old fid may have moved - find it again */
1192         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1193         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1194 
1195         if (new_inode) {
1196                 new_inode->i_ctime = current_time(new_inode);
1197                 inode_dec_link_count(new_inode);
1198         }
1199         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1200         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1201         mark_inode_dirty(old_dir);
1202         mark_inode_dirty(new_dir);
1203 
1204         if (dir_fi) {
1205                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1206                 udf_update_tag((char *)dir_fi,
1207                                 (sizeof(struct fileIdentDesc) +
1208                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1209                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1210                         mark_inode_dirty(old_inode);
1211                 else
1212                         mark_buffer_dirty_inode(dir_bh, old_inode);
1213 
1214                 inode_dec_link_count(old_dir);
1215                 if (new_inode)
1216                         inode_dec_link_count(new_inode);
1217                 else {
1218                         inc_nlink(new_dir);
1219                         mark_inode_dirty(new_dir);
1220                 }
1221         }
1222 
1223         if (ofi) {
1224                 if (ofibh.sbh != ofibh.ebh)
1225                         brelse(ofibh.ebh);
1226                 brelse(ofibh.sbh);
1227         }
1228 
1229         retval = 0;
1230 
1231 end_rename:
1232         brelse(dir_bh);
1233         if (nfi) {
1234                 if (nfibh.sbh != nfibh.ebh)
1235                         brelse(nfibh.ebh);
1236                 brelse(nfibh.sbh);
1237         }
1238 
1239         return retval;
1240 }
1241 
1242 static struct dentry *udf_get_parent(struct dentry *child)
1243 {
1244         struct kernel_lb_addr tloc;
1245         struct inode *inode = NULL;
1246         struct qstr dotdot = QSTR_INIT("..", 2);
1247         struct fileIdentDesc cfi;
1248         struct udf_fileident_bh fibh;
1249 
1250         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1251                 return ERR_PTR(-EACCES);
1252 
1253         if (fibh.sbh != fibh.ebh)
1254                 brelse(fibh.ebh);
1255         brelse(fibh.sbh);
1256 
1257         tloc = lelb_to_cpu(cfi.icb.extLocation);
1258         inode = udf_iget(child->d_sb, &tloc);
1259         if (IS_ERR(inode))
1260                 return ERR_CAST(inode);
1261 
1262         return d_obtain_alias(inode);
1263 }
1264 
1265 
1266 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1267                                         u16 partref, __u32 generation)
1268 {
1269         struct inode *inode;
1270         struct kernel_lb_addr loc;
1271 
1272         if (block == 0)
1273                 return ERR_PTR(-ESTALE);
1274 
1275         loc.logicalBlockNum = block;
1276         loc.partitionReferenceNum = partref;
1277         inode = udf_iget(sb, &loc);
1278 
1279         if (IS_ERR(inode))
1280                 return ERR_CAST(inode);
1281 
1282         if (generation && inode->i_generation != generation) {
1283                 iput(inode);
1284                 return ERR_PTR(-ESTALE);
1285         }
1286         return d_obtain_alias(inode);
1287 }
1288 
1289 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1290                                        struct fid *fid, int fh_len, int fh_type)
1291 {
1292         if (fh_len < 3 ||
1293             (fh_type != FILEID_UDF_WITH_PARENT &&
1294              fh_type != FILEID_UDF_WITHOUT_PARENT))
1295                 return NULL;
1296 
1297         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1298                         fid->udf.generation);
1299 }
1300 
1301 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1302                                        struct fid *fid, int fh_len, int fh_type)
1303 {
1304         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1305                 return NULL;
1306 
1307         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1308                                  fid->udf.parent_partref,
1309                                  fid->udf.parent_generation);
1310 }
1311 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1312                          struct inode *parent)
1313 {
1314         int len = *lenp;
1315         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1316         struct fid *fid = (struct fid *)fh;
1317         int type = FILEID_UDF_WITHOUT_PARENT;
1318 
1319         if (parent && (len < 5)) {
1320                 *lenp = 5;
1321                 return FILEID_INVALID;
1322         } else if (len < 3) {
1323                 *lenp = 3;
1324                 return FILEID_INVALID;
1325         }
1326 
1327         *lenp = 3;
1328         fid->udf.block = location.logicalBlockNum;
1329         fid->udf.partref = location.partitionReferenceNum;
1330         fid->udf.parent_partref = 0;
1331         fid->udf.generation = inode->i_generation;
1332 
1333         if (parent) {
1334                 location = UDF_I(parent)->i_location;
1335                 fid->udf.parent_block = location.logicalBlockNum;
1336                 fid->udf.parent_partref = location.partitionReferenceNum;
1337                 fid->udf.parent_generation = inode->i_generation;
1338                 *lenp = 5;
1339                 type = FILEID_UDF_WITH_PARENT;
1340         }
1341 
1342         return type;
1343 }
1344 
1345 const struct export_operations udf_export_ops = {
1346         .encode_fh      = udf_encode_fh,
1347         .fh_to_dentry   = udf_fh_to_dentry,
1348         .fh_to_parent   = udf_fh_to_parent,
1349         .get_parent     = udf_get_parent,
1350 };
1351 
1352 const struct inode_operations udf_dir_inode_operations = {
1353         .lookup                         = udf_lookup,
1354         .create                         = udf_create,
1355         .link                           = udf_link,
1356         .unlink                         = udf_unlink,
1357         .symlink                        = udf_symlink,
1358         .mkdir                          = udf_mkdir,
1359         .rmdir                          = udf_rmdir,
1360         .mknod                          = udf_mknod,
1361         .rename                         = udf_rename,
1362         .tmpfile                        = udf_tmpfile,
1363 };
1364 

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