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

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