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

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