blob: 407c1296b7c73eeef7306f2cbb4ef417364f9de1 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -07001/*
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/buffer_head.h>
31#include <linux/sched.h>
32#include <linux/crc-itu-t.h>
33#include <linux/exportfs.h>
34
35static inline int udf_match(int len1, const unsigned char *name1, int len2,
36 const unsigned char *name2)
37{
38 if (len1 != len2)
39 return 0;
40
41 return !memcmp(name1, name2, len1);
42}
43
44int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
45 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
46 uint8_t *impuse, uint8_t *fileident)
47{
48 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
49 uint16_t crc;
50 int offset;
51 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
52 uint8_t lfi = cfi->lengthFileIdent;
53 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
54 sizeof(struct fileIdentDesc);
55 int adinicb = 0;
56
57 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
58 adinicb = 1;
59
60 offset = fibh->soffset + sizeof(struct fileIdentDesc);
61
62 if (impuse) {
63 if (adinicb || (offset + liu < 0)) {
64 memcpy((uint8_t *)sfi->impUse, impuse, liu);
65 } else if (offset >= 0) {
66 memcpy(fibh->ebh->b_data + offset, impuse, liu);
67 } else {
68 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
69 memcpy(fibh->ebh->b_data, impuse - offset,
70 liu + offset);
71 }
72 }
73
74 offset += liu;
75
76 if (fileident) {
77 if (adinicb || (offset + lfi < 0)) {
78 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
79 } else if (offset >= 0) {
80 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
81 } else {
82 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
83 -offset);
84 memcpy(fibh->ebh->b_data, fileident - offset,
85 lfi + offset);
86 }
87 }
88
89 offset += lfi;
90
91 if (adinicb || (offset + padlen < 0)) {
92 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
93 } else if (offset >= 0) {
94 memset(fibh->ebh->b_data + offset, 0x00, padlen);
95 } else {
96 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
97 memset(fibh->ebh->b_data, 0x00, padlen + offset);
98 }
99
100 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
101 sizeof(struct fileIdentDesc) - sizeof(struct tag));
102
103 if (fibh->sbh == fibh->ebh) {
104 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
105 crclen + sizeof(struct tag) -
106 sizeof(struct fileIdentDesc));
107 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
108 crc = crc_itu_t(crc, fibh->ebh->b_data +
109 sizeof(struct fileIdentDesc) +
110 fibh->soffset,
111 crclen + sizeof(struct tag) -
112 sizeof(struct fileIdentDesc));
113 } else {
114 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
115 -fibh->soffset - sizeof(struct fileIdentDesc));
116 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
117 }
118
119 cfi->descTag.descCRC = cpu_to_le16(crc);
120 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
121 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
122
123 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
124 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
125 sizeof(struct fileIdentDesc));
126 } else {
127 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
128 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
129 sizeof(struct fileIdentDesc) + fibh->soffset);
130 }
131
132 if (adinicb) {
133 mark_inode_dirty(inode);
134 } else {
135 if (fibh->sbh != fibh->ebh)
136 mark_buffer_dirty_inode(fibh->ebh, inode);
137 mark_buffer_dirty_inode(fibh->sbh, inode);
138 }
139 return 0;
140}
141
142static struct fileIdentDesc *udf_find_entry(struct inode *dir,
143 const struct qstr *child,
144 struct udf_fileident_bh *fibh,
145 struct fileIdentDesc *cfi)
146{
147 struct fileIdentDesc *fi = NULL;
148 loff_t f_pos;
149 int block, flen;
150 unsigned char *fname = NULL;
151 unsigned char *nameptr;
152 uint8_t lfi;
153 uint16_t liu;
154 loff_t size;
155 struct kernel_lb_addr eloc;
156 uint32_t elen;
157 sector_t offset;
158 struct extent_position epos = {};
159 struct udf_inode_info *dinfo = UDF_I(dir);
160 int isdotdot = child->len == 2 &&
161 child->name[0] == '.' && child->name[1] == '.';
162
163 size = udf_ext0_offset(dir) + dir->i_size;
164 f_pos = udf_ext0_offset(dir);
165
166 fibh->sbh = fibh->ebh = NULL;
167 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
168 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
169 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
170 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
171 goto out_err;
172 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
173 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
174 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
175 epos.offset -= sizeof(struct short_ad);
176 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
177 epos.offset -= sizeof(struct long_ad);
178 } else
179 offset = 0;
180
181 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
182 if (!fibh->sbh)
183 goto out_err;
184 }
185
186 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
187 if (!fname)
188 goto out_err;
189
190 while (f_pos < size) {
191 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
192 &elen, &offset);
193 if (!fi)
194 goto out_err;
195
196 liu = le16_to_cpu(cfi->lengthOfImpUse);
197 lfi = cfi->lengthFileIdent;
198
199 if (fibh->sbh == fibh->ebh) {
200 nameptr = fi->fileIdent + liu;
201 } else {
202 int poffset; /* Unpaded ending offset */
203
204 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
205 liu + lfi;
206
207 if (poffset >= lfi)
208 nameptr = (uint8_t *)(fibh->ebh->b_data +
209 poffset - lfi);
210 else {
211 nameptr = fname;
212 memcpy(nameptr, fi->fileIdent + liu,
213 lfi - poffset);
214 memcpy(nameptr + lfi - poffset,
215 fibh->ebh->b_data, poffset);
216 }
217 }
218
219 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
220 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
221 continue;
222 }
223
224 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
225 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
226 continue;
227 }
228
229 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
230 isdotdot)
231 goto out_ok;
232
233 if (!lfi)
234 continue;
235
236 flen = udf_get_filename(dir->i_sb, nameptr, lfi, fname,
237 UDF_NAME_LEN);
238 if (flen && udf_match(flen, fname, child->len, child->name))
239 goto out_ok;
240 }
241
242out_err:
243 fi = NULL;
244 if (fibh->sbh != fibh->ebh)
245 brelse(fibh->ebh);
246 brelse(fibh->sbh);
247out_ok:
248 brelse(epos.bh);
249 kfree(fname);
250
251 return fi;
252}
253
254static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
255 struct nameidata *nd)
256{
257 struct inode *inode = NULL;
258 struct fileIdentDesc cfi;
259 struct udf_fileident_bh fibh;
260
261 if (dentry->d_name.len > UDF_NAME_LEN - 2)
262 return ERR_PTR(-ENAMETOOLONG);
263
264#ifdef UDF_RECOVERY
265 /* temporary shorthand for specifying files by inode number */
266 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
267 struct kernel_lb_addr lb = {
268 .logicalBlockNum = 0,
269 .partitionReferenceNum =
270 simple_strtoul(dentry->d_name.name + 3,
271 NULL, 0),
272 };
273 inode = udf_iget(dir->i_sb, lb);
274 if (!inode) {
275 return ERR_PTR(-EACCES);
276 }
277 } else
278#endif /* UDF_RECOVERY */
279
280 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
281 struct kernel_lb_addr loc;
282
283 if (fibh.sbh != fibh.ebh)
284 brelse(fibh.ebh);
285 brelse(fibh.sbh);
286
287 loc = lelb_to_cpu(cfi.icb.extLocation);
288 inode = udf_iget(dir->i_sb, &loc);
289 if (!inode) {
290 return ERR_PTR(-EACCES);
291 }
292 }
293
294 return d_splice_alias(inode, dentry);
295}
296
297static struct fileIdentDesc *udf_add_entry(struct inode *dir,
298 struct dentry *dentry,
299 struct udf_fileident_bh *fibh,
300 struct fileIdentDesc *cfi, int *err)
301{
302 struct super_block *sb = dir->i_sb;
303 struct fileIdentDesc *fi = NULL;
304 unsigned char *name = NULL;
305 int namelen;
306 loff_t f_pos;
307 loff_t size = udf_ext0_offset(dir) + dir->i_size;
308 int nfidlen;
309 uint8_t lfi;
310 uint16_t liu;
311 int block;
312 struct kernel_lb_addr eloc;
313 uint32_t elen = 0;
314 sector_t offset;
315 struct extent_position epos = {};
316 struct udf_inode_info *dinfo;
317
318 fibh->sbh = fibh->ebh = NULL;
319 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
320 if (!name) {
321 *err = -ENOMEM;
322 goto out_err;
323 }
324
325 if (dentry) {
326 if (!dentry->d_name.len) {
327 *err = -EINVAL;
328 goto out_err;
329 }
330 namelen = udf_put_filename(sb, dentry->d_name.name, name,
331 dentry->d_name.len);
332 if (!namelen) {
333 *err = -ENAMETOOLONG;
334 goto out_err;
335 }
336 } else {
337 namelen = 0;
338 }
339
340 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
341
342 f_pos = udf_ext0_offset(dir);
343
344 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
345 dinfo = UDF_I(dir);
346 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
347 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
348 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
349 block = udf_get_lb_pblock(dir->i_sb,
350 &dinfo->i_location, 0);
351 fibh->soffset = fibh->eoffset = sb->s_blocksize;
352 goto add;
353 }
354 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
355 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
356 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
357 epos.offset -= sizeof(struct short_ad);
358 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
359 epos.offset -= sizeof(struct long_ad);
360 } else
361 offset = 0;
362
363 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
364 if (!fibh->sbh) {
365 *err = -EIO;
366 goto out_err;
367 }
368
369 block = dinfo->i_location.logicalBlockNum;
370 }
371
372 while (f_pos < size) {
373 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
374 &elen, &offset);
375
376 if (!fi) {
377 *err = -EIO;
378 goto out_err;
379 }
380
381 liu = le16_to_cpu(cfi->lengthOfImpUse);
382 lfi = cfi->lengthFileIdent;
383
384 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
385 if (((sizeof(struct fileIdentDesc) +
386 liu + lfi + 3) & ~3) == nfidlen) {
387 cfi->descTag.tagSerialNum = cpu_to_le16(1);
388 cfi->fileVersionNum = cpu_to_le16(1);
389 cfi->fileCharacteristics = 0;
390 cfi->lengthFileIdent = namelen;
391 cfi->lengthOfImpUse = cpu_to_le16(0);
392 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
393 name))
394 goto out_ok;
395 else {
396 *err = -EIO;
397 goto out_err;
398 }
399 }
400 }
401 }
402
403add:
404 f_pos += nfidlen;
405
406 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
407 sb->s_blocksize - fibh->eoffset < nfidlen) {
408 brelse(epos.bh);
409 epos.bh = NULL;
410 fibh->soffset -= udf_ext0_offset(dir);
411 fibh->eoffset -= udf_ext0_offset(dir);
412 f_pos -= udf_ext0_offset(dir);
413 if (fibh->sbh != fibh->ebh)
414 brelse(fibh->ebh);
415 brelse(fibh->sbh);
416 fibh->sbh = fibh->ebh =
417 udf_expand_dir_adinicb(dir, &block, err);
418 if (!fibh->sbh)
419 goto out_err;
420 epos.block = dinfo->i_location;
421 epos.offset = udf_file_entry_alloc_offset(dir);
422 /* Load extent udf_expand_dir_adinicb() has created */
423 udf_current_aext(dir, &epos, &eloc, &elen, 1);
424 }
425
426 /* Entry fits into current block? */
427 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
428 fibh->soffset = fibh->eoffset;
429 fibh->eoffset += nfidlen;
430 if (fibh->sbh != fibh->ebh) {
431 brelse(fibh->sbh);
432 fibh->sbh = fibh->ebh;
433 }
434
435 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
436 block = dinfo->i_location.logicalBlockNum;
437 fi = (struct fileIdentDesc *)
438 (dinfo->i_ext.i_data +
439 fibh->soffset -
440 udf_ext0_offset(dir) +
441 dinfo->i_lenEAttr);
442 } else {
443 block = eloc.logicalBlockNum +
444 ((elen - 1) >>
445 dir->i_sb->s_blocksize_bits);
446 fi = (struct fileIdentDesc *)
447 (fibh->sbh->b_data + fibh->soffset);
448 }
449 } else {
450 /* Round up last extent in the file */
451 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
452 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
453 epos.offset -= sizeof(struct short_ad);
454 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
455 epos.offset -= sizeof(struct long_ad);
456 udf_write_aext(dir, &epos, &eloc, elen, 1);
457 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
458 - 1) & ~(sb->s_blocksize - 1);
459
460 fibh->soffset = fibh->eoffset - sb->s_blocksize;
461 fibh->eoffset += nfidlen - sb->s_blocksize;
462 if (fibh->sbh != fibh->ebh) {
463 brelse(fibh->sbh);
464 fibh->sbh = fibh->ebh;
465 }
466
467 block = eloc.logicalBlockNum + ((elen - 1) >>
468 dir->i_sb->s_blocksize_bits);
469 fibh->ebh = udf_bread(dir,
470 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
471 if (!fibh->ebh)
472 goto out_err;
473 /* Extents could have been merged, invalidate our position */
474 brelse(epos.bh);
475 epos.bh = NULL;
476 epos.block = dinfo->i_location;
477 epos.offset = udf_file_entry_alloc_offset(dir);
478
479 if (!fibh->soffset) {
480 /* Find the freshly allocated block */
481 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
482 (EXT_RECORDED_ALLOCATED >> 30))
483 ;
484 block = eloc.logicalBlockNum + ((elen - 1) >>
485 dir->i_sb->s_blocksize_bits);
486 brelse(fibh->sbh);
487 fibh->sbh = fibh->ebh;
488 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
489 } else {
490 fi = (struct fileIdentDesc *)
491 (fibh->sbh->b_data + sb->s_blocksize +
492 fibh->soffset);
493 }
494 }
495
496 memset(cfi, 0, sizeof(struct fileIdentDesc));
497 if (UDF_SB(sb)->s_udfrev >= 0x0200)
498 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
499 sizeof(struct tag));
500 else
501 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
502 sizeof(struct tag));
503 cfi->fileVersionNum = cpu_to_le16(1);
504 cfi->lengthFileIdent = namelen;
505 cfi->lengthOfImpUse = cpu_to_le16(0);
506 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
507 dir->i_size += nfidlen;
508 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
509 dinfo->i_lenAlloc += nfidlen;
510 else {
511 /* Find the last extent and truncate it to proper size */
512 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
513 (EXT_RECORDED_ALLOCATED >> 30))
514 ;
515 elen -= dinfo->i_lenExtents - dir->i_size;
516 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
517 epos.offset -= sizeof(struct short_ad);
518 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
519 epos.offset -= sizeof(struct long_ad);
520 udf_write_aext(dir, &epos, &eloc, elen, 1);
521 dinfo->i_lenExtents = dir->i_size;
522 }
523
524 mark_inode_dirty(dir);
525 goto out_ok;
526 } else {
527 *err = -EIO;
528 goto out_err;
529 }
530
531out_err:
532 fi = NULL;
533 if (fibh->sbh != fibh->ebh)
534 brelse(fibh->ebh);
535 brelse(fibh->sbh);
536out_ok:
537 brelse(epos.bh);
538 kfree(name);
539 return fi;
540}
541
542static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
543 struct udf_fileident_bh *fibh,
544 struct fileIdentDesc *cfi)
545{
546 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
547
548 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
549 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
550
551 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
552}
553
554static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
555 struct nameidata *nd)
556{
557 struct udf_fileident_bh fibh;
558 struct inode *inode;
559 struct fileIdentDesc cfi, *fi;
560 int err;
561 struct udf_inode_info *iinfo;
562
563 inode = udf_new_inode(dir, mode, &err);
564 if (!inode) {
565 return err;
566 }
567
568 iinfo = UDF_I(inode);
569 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
570 inode->i_data.a_ops = &udf_adinicb_aops;
571 else
572 inode->i_data.a_ops = &udf_aops;
573 inode->i_op = &udf_file_inode_operations;
574 inode->i_fop = &udf_file_operations;
575 mark_inode_dirty(inode);
576
577 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
578 if (!fi) {
579 inode_dec_link_count(inode);
580 iput(inode);
581 return err;
582 }
583 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
584 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
585 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
586 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
587 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
588 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
589 mark_inode_dirty(dir);
590 if (fibh.sbh != fibh.ebh)
591 brelse(fibh.ebh);
592 brelse(fibh.sbh);
593 d_instantiate(dentry, inode);
594
595 return 0;
596}
597
598static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
599 dev_t rdev)
600{
601 struct inode *inode;
602 struct udf_fileident_bh fibh;
603 struct fileIdentDesc cfi, *fi;
604 int err;
605 struct udf_inode_info *iinfo;
606
607 if (!old_valid_dev(rdev))
608 return -EINVAL;
609
610 err = -EIO;
611 inode = udf_new_inode(dir, mode, &err);
612 if (!inode)
613 goto out;
614
615 iinfo = UDF_I(inode);
616 init_special_inode(inode, mode, rdev);
617 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
618 if (!fi) {
619 inode_dec_link_count(inode);
620 iput(inode);
621 return err;
622 }
623 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
624 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
625 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
626 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
627 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
628 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
629 mark_inode_dirty(dir);
630 mark_inode_dirty(inode);
631
632 if (fibh.sbh != fibh.ebh)
633 brelse(fibh.ebh);
634 brelse(fibh.sbh);
635 d_instantiate(dentry, inode);
636 err = 0;
637
638out:
639 return err;
640}
641
642static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
643{
644 struct inode *inode;
645 struct udf_fileident_bh fibh;
646 struct fileIdentDesc cfi, *fi;
647 int err;
648 struct udf_inode_info *dinfo = UDF_I(dir);
649 struct udf_inode_info *iinfo;
650
651 err = -EIO;
652 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
653 if (!inode)
654 goto out;
655
656 iinfo = UDF_I(inode);
657 inode->i_op = &udf_dir_inode_operations;
658 inode->i_fop = &udf_dir_operations;
659 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
660 if (!fi) {
661 inode_dec_link_count(inode);
662 iput(inode);
663 goto out;
664 }
665 set_nlink(inode, 2);
666 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
667 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
668 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
669 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
670 cfi.fileCharacteristics =
671 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
672 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
673 brelse(fibh.sbh);
674 mark_inode_dirty(inode);
675
676 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
677 if (!fi) {
678 clear_nlink(inode);
679 mark_inode_dirty(inode);
680 iput(inode);
681 goto out;
682 }
683 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
684 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
685 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
686 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
687 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
688 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
689 inc_nlink(dir);
690 mark_inode_dirty(dir);
691 d_instantiate(dentry, inode);
692 if (fibh.sbh != fibh.ebh)
693 brelse(fibh.ebh);
694 brelse(fibh.sbh);
695 err = 0;
696
697out:
698 return err;
699}
700
701static int empty_dir(struct inode *dir)
702{
703 struct fileIdentDesc *fi, cfi;
704 struct udf_fileident_bh fibh;
705 loff_t f_pos;
706 loff_t size = udf_ext0_offset(dir) + dir->i_size;
707 int block;
708 struct kernel_lb_addr eloc;
709 uint32_t elen;
710 sector_t offset;
711 struct extent_position epos = {};
712 struct udf_inode_info *dinfo = UDF_I(dir);
713
714 f_pos = udf_ext0_offset(dir);
715 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
716
717 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
718 fibh.sbh = fibh.ebh = NULL;
719 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
720 &epos, &eloc, &elen, &offset) ==
721 (EXT_RECORDED_ALLOCATED >> 30)) {
722 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
723 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
724 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
725 epos.offset -= sizeof(struct short_ad);
726 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
727 epos.offset -= sizeof(struct long_ad);
728 } else
729 offset = 0;
730
731 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
732 if (!fibh.sbh) {
733 brelse(epos.bh);
734 return 0;
735 }
736 } else {
737 brelse(epos.bh);
738 return 0;
739 }
740
741 while (f_pos < size) {
742 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
743 &elen, &offset);
744 if (!fi) {
745 if (fibh.sbh != fibh.ebh)
746 brelse(fibh.ebh);
747 brelse(fibh.sbh);
748 brelse(epos.bh);
749 return 0;
750 }
751
752 if (cfi.lengthFileIdent &&
753 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
754 if (fibh.sbh != fibh.ebh)
755 brelse(fibh.ebh);
756 brelse(fibh.sbh);
757 brelse(epos.bh);
758 return 0;
759 }
760 }
761
762 if (fibh.sbh != fibh.ebh)
763 brelse(fibh.ebh);
764 brelse(fibh.sbh);
765 brelse(epos.bh);
766
767 return 1;
768}
769
770static int udf_rmdir(struct inode *dir, struct dentry *dentry)
771{
772 int retval;
773 struct inode *inode = dentry->d_inode;
774 struct udf_fileident_bh fibh;
775 struct fileIdentDesc *fi, cfi;
776 struct kernel_lb_addr tloc;
777
778 retval = -ENOENT;
779 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
780 if (!fi)
781 goto out;
782
783 retval = -EIO;
784 tloc = lelb_to_cpu(cfi.icb.extLocation);
785 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
786 goto end_rmdir;
787 retval = -ENOTEMPTY;
788 if (!empty_dir(inode))
789 goto end_rmdir;
790 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
791 if (retval)
792 goto end_rmdir;
793 if (inode->i_nlink != 2)
794 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
795 inode->i_nlink);
796 clear_nlink(inode);
797 inode->i_size = 0;
798 inode_dec_link_count(dir);
799 inode->i_ctime = dir->i_ctime = dir->i_mtime =
800 current_fs_time(dir->i_sb);
801 mark_inode_dirty(dir);
802
803end_rmdir:
804 if (fibh.sbh != fibh.ebh)
805 brelse(fibh.ebh);
806 brelse(fibh.sbh);
807
808out:
809 return retval;
810}
811
812static int udf_unlink(struct inode *dir, struct dentry *dentry)
813{
814 int retval;
815 struct inode *inode = dentry->d_inode;
816 struct udf_fileident_bh fibh;
817 struct fileIdentDesc *fi;
818 struct fileIdentDesc cfi;
819 struct kernel_lb_addr tloc;
820
821 retval = -ENOENT;
822 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
823 if (!fi)
824 goto out;
825
826 retval = -EIO;
827 tloc = lelb_to_cpu(cfi.icb.extLocation);
828 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
829 goto end_unlink;
830
831 if (!inode->i_nlink) {
832 udf_debug("Deleting nonexistent file (%lu), %d\n",
833 inode->i_ino, inode->i_nlink);
834 set_nlink(inode, 1);
835 }
836 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
837 if (retval)
838 goto end_unlink;
839 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
840 mark_inode_dirty(dir);
841 inode_dec_link_count(inode);
842 inode->i_ctime = dir->i_ctime;
843 retval = 0;
844
845end_unlink:
846 if (fibh.sbh != fibh.ebh)
847 brelse(fibh.ebh);
848 brelse(fibh.sbh);
849
850out:
851 return retval;
852}
853
854static int udf_symlink(struct inode *dir, struct dentry *dentry,
855 const char *symname)
856{
857 struct inode *inode;
858 struct pathComponent *pc;
859 const char *compstart;
860 struct udf_fileident_bh fibh;
861 struct extent_position epos = {};
862 int eoffset, elen = 0;
863 struct fileIdentDesc *fi;
864 struct fileIdentDesc cfi;
865 uint8_t *ea;
866 int err;
867 int block;
868 unsigned char *name = NULL;
869 int namelen;
870 struct udf_inode_info *iinfo;
871 struct super_block *sb = dir->i_sb;
872
873 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
874 if (!inode)
875 goto out;
876
877 iinfo = UDF_I(inode);
878 down_write(&iinfo->i_data_sem);
879 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
880 if (!name) {
881 err = -ENOMEM;
882 goto out_no_entry;
883 }
884
885 inode->i_data.a_ops = &udf_symlink_aops;
886 inode->i_op = &udf_symlink_inode_operations;
887
888 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
889 struct kernel_lb_addr eloc;
890 uint32_t bsize;
891
892 block = udf_new_block(sb, inode,
893 iinfo->i_location.partitionReferenceNum,
894 iinfo->i_location.logicalBlockNum, &err);
895 if (!block)
896 goto out_no_entry;
897 epos.block = iinfo->i_location;
898 epos.offset = udf_file_entry_alloc_offset(inode);
899 epos.bh = NULL;
900 eloc.logicalBlockNum = block;
901 eloc.partitionReferenceNum =
902 iinfo->i_location.partitionReferenceNum;
903 bsize = sb->s_blocksize;
904 iinfo->i_lenExtents = bsize;
905 udf_add_aext(inode, &epos, &eloc, bsize, 0);
906 brelse(epos.bh);
907
908 block = udf_get_pblock(sb, block,
909 iinfo->i_location.partitionReferenceNum,
910 0);
911 epos.bh = udf_tgetblk(sb, block);
912 lock_buffer(epos.bh);
913 memset(epos.bh->b_data, 0x00, bsize);
914 set_buffer_uptodate(epos.bh);
915 unlock_buffer(epos.bh);
916 mark_buffer_dirty_inode(epos.bh, inode);
917 ea = epos.bh->b_data + udf_ext0_offset(inode);
918 } else
919 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
920
921 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
922 pc = (struct pathComponent *)ea;
923
924 if (*symname == '/') {
925 do {
926 symname++;
927 } while (*symname == '/');
928
929 pc->componentType = 1;
930 pc->lengthComponentIdent = 0;
931 pc->componentFileVersionNum = 0;
932 elen += sizeof(struct pathComponent);
933 }
934
935 err = -ENAMETOOLONG;
936
937 while (*symname) {
938 if (elen + sizeof(struct pathComponent) > eoffset)
939 goto out_no_entry;
940
941 pc = (struct pathComponent *)(ea + elen);
942
943 compstart = symname;
944
945 do {
946 symname++;
947 } while (*symname && *symname != '/');
948
949 pc->componentType = 5;
950 pc->lengthComponentIdent = 0;
951 pc->componentFileVersionNum = 0;
952 if (compstart[0] == '.') {
953 if ((symname - compstart) == 1)
954 pc->componentType = 4;
955 else if ((symname - compstart) == 2 &&
956 compstart[1] == '.')
957 pc->componentType = 3;
958 }
959
960 if (pc->componentType == 5) {
961 namelen = udf_put_filename(sb, compstart, name,
962 symname - compstart);
963 if (!namelen)
964 goto out_no_entry;
965
966 if (elen + sizeof(struct pathComponent) + namelen >
967 eoffset)
968 goto out_no_entry;
969 else
970 pc->lengthComponentIdent = namelen;
971
972 memcpy(pc->componentIdent, name, namelen);
973 }
974
975 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
976
977 if (*symname) {
978 do {
979 symname++;
980 } while (*symname == '/');
981 }
982 }
983
984 brelse(epos.bh);
985 inode->i_size = elen;
986 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
987 iinfo->i_lenAlloc = inode->i_size;
988 else
989 udf_truncate_tail_extent(inode);
990 mark_inode_dirty(inode);
991
992 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
993 if (!fi)
994 goto out_no_entry;
995 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
996 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
997 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
998 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
999 cpu_to_le32(lvid_get_unique_id(sb));
1000 }
1001 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1002 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1003 mark_inode_dirty(dir);
1004 up_write(&iinfo->i_data_sem);
1005 if (fibh.sbh != fibh.ebh)
1006 brelse(fibh.ebh);
1007 brelse(fibh.sbh);
1008 d_instantiate(dentry, inode);
1009 err = 0;
1010
1011out:
1012 kfree(name);
1013 return err;
1014
1015out_no_entry:
1016 up_write(&iinfo->i_data_sem);
1017 inode_dec_link_count(inode);
1018 iput(inode);
1019 goto out;
1020}
1021
1022static int udf_link(struct dentry *old_dentry, struct inode *dir,
1023 struct dentry *dentry)
1024{
1025 struct inode *inode = old_dentry->d_inode;
1026 struct udf_fileident_bh fibh;
1027 struct fileIdentDesc cfi, *fi;
1028 int err;
1029
1030 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1031 if (!fi) {
1032 return err;
1033 }
1034 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1035 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1036 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1037 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1038 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1039 }
1040 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1041 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1042 mark_inode_dirty(dir);
1043
1044 if (fibh.sbh != fibh.ebh)
1045 brelse(fibh.ebh);
1046 brelse(fibh.sbh);
1047 inc_nlink(inode);
1048 inode->i_ctime = current_fs_time(inode->i_sb);
1049 mark_inode_dirty(inode);
1050 ihold(inode);
1051 d_instantiate(dentry, inode);
1052
1053 return 0;
1054}
1055
1056/* Anybody can rename anything with this: the permission checks are left to the
1057 * higher-level routines.
1058 */
1059static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1060 struct inode *new_dir, struct dentry *new_dentry)
1061{
1062 struct inode *old_inode = old_dentry->d_inode;
1063 struct inode *new_inode = new_dentry->d_inode;
1064 struct udf_fileident_bh ofibh, nfibh;
1065 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1066 struct fileIdentDesc ocfi, ncfi;
1067 struct buffer_head *dir_bh = NULL;
1068 int retval = -ENOENT;
1069 struct kernel_lb_addr tloc;
1070 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1071
1072 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1073 if (ofi) {
1074 if (ofibh.sbh != ofibh.ebh)
1075 brelse(ofibh.ebh);
1076 brelse(ofibh.sbh);
1077 }
1078 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1079 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1080 != old_inode->i_ino)
1081 goto end_rename;
1082
1083 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1084 if (nfi) {
1085 if (!new_inode) {
1086 if (nfibh.sbh != nfibh.ebh)
1087 brelse(nfibh.ebh);
1088 brelse(nfibh.sbh);
1089 nfi = NULL;
1090 }
1091 }
1092 if (S_ISDIR(old_inode->i_mode)) {
1093 int offset = udf_ext0_offset(old_inode);
1094
1095 if (new_inode) {
1096 retval = -ENOTEMPTY;
1097 if (!empty_dir(new_inode))
1098 goto end_rename;
1099 }
1100 retval = -EIO;
1101 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1102 dir_fi = udf_get_fileident(
1103 old_iinfo->i_ext.i_data -
1104 (old_iinfo->i_efe ?
1105 sizeof(struct extendedFileEntry) :
1106 sizeof(struct fileEntry)),
1107 old_inode->i_sb->s_blocksize, &offset);
1108 } else {
1109 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1110 if (!dir_bh)
1111 goto end_rename;
1112 dir_fi = udf_get_fileident(dir_bh->b_data,
1113 old_inode->i_sb->s_blocksize, &offset);
1114 }
1115 if (!dir_fi)
1116 goto end_rename;
1117 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1118 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1119 old_dir->i_ino)
1120 goto end_rename;
1121 }
1122 if (!nfi) {
1123 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1124 &retval);
1125 if (!nfi)
1126 goto end_rename;
1127 }
1128
1129 /*
1130 * Like most other Unix systems, set the ctime for inodes on a
1131 * rename.
1132 */
1133 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1134 mark_inode_dirty(old_inode);
1135
1136 /*
1137 * ok, that's it
1138 */
1139 ncfi.fileVersionNum = ocfi.fileVersionNum;
1140 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1141 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1142 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1143
1144 /* The old fid may have moved - find it again */
1145 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1146 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1147
1148 if (new_inode) {
1149 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1150 inode_dec_link_count(new_inode);
1151 }
1152 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1153 mark_inode_dirty(old_dir);
1154
1155 if (dir_fi) {
1156 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1157 udf_update_tag((char *)dir_fi,
1158 (sizeof(struct fileIdentDesc) +
1159 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1160 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1161 mark_inode_dirty(old_inode);
1162 else
1163 mark_buffer_dirty_inode(dir_bh, old_inode);
1164
1165 inode_dec_link_count(old_dir);
1166 if (new_inode)
1167 inode_dec_link_count(new_inode);
1168 else {
1169 inc_nlink(new_dir);
1170 mark_inode_dirty(new_dir);
1171 }
1172 }
1173
1174 if (ofi) {
1175 if (ofibh.sbh != ofibh.ebh)
1176 brelse(ofibh.ebh);
1177 brelse(ofibh.sbh);
1178 }
1179
1180 retval = 0;
1181
1182end_rename:
1183 brelse(dir_bh);
1184 if (nfi) {
1185 if (nfibh.sbh != nfibh.ebh)
1186 brelse(nfibh.ebh);
1187 brelse(nfibh.sbh);
1188 }
1189
1190 return retval;
1191}
1192
1193static struct dentry *udf_get_parent(struct dentry *child)
1194{
1195 struct kernel_lb_addr tloc;
1196 struct inode *inode = NULL;
1197 struct qstr dotdot = {.name = "..", .len = 2};
1198 struct fileIdentDesc cfi;
1199 struct udf_fileident_bh fibh;
1200
1201 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1202 goto out_unlock;
1203
1204 if (fibh.sbh != fibh.ebh)
1205 brelse(fibh.ebh);
1206 brelse(fibh.sbh);
1207
1208 tloc = lelb_to_cpu(cfi.icb.extLocation);
1209 inode = udf_iget(child->d_inode->i_sb, &tloc);
1210 if (!inode)
1211 goto out_unlock;
1212
1213 return d_obtain_alias(inode);
1214out_unlock:
1215 return ERR_PTR(-EACCES);
1216}
1217
1218
1219static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1220 u16 partref, __u32 generation)
1221{
1222 struct inode *inode;
1223 struct kernel_lb_addr loc;
1224
1225 if (block == 0)
1226 return ERR_PTR(-ESTALE);
1227
1228 loc.logicalBlockNum = block;
1229 loc.partitionReferenceNum = partref;
1230 inode = udf_iget(sb, &loc);
1231
1232 if (inode == NULL)
1233 return ERR_PTR(-ENOMEM);
1234
1235 if (generation && inode->i_generation != generation) {
1236 iput(inode);
1237 return ERR_PTR(-ESTALE);
1238 }
1239 return d_obtain_alias(inode);
1240}
1241
1242static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1243 struct fid *fid, int fh_len, int fh_type)
1244{
1245 if ((fh_len != 3 && fh_len != 5) ||
1246 (fh_type != FILEID_UDF_WITH_PARENT &&
1247 fh_type != FILEID_UDF_WITHOUT_PARENT))
1248 return NULL;
1249
1250 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1251 fid->udf.generation);
1252}
1253
1254static struct dentry *udf_fh_to_parent(struct super_block *sb,
1255 struct fid *fid, int fh_len, int fh_type)
1256{
1257 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1258 return NULL;
1259
1260 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1261 fid->udf.parent_partref,
1262 fid->udf.parent_generation);
1263}
1264static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1265 int connectable)
1266{
1267 int len = *lenp;
1268 struct inode *inode = de->d_inode;
1269 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1270 struct fid *fid = (struct fid *)fh;
1271 int type = FILEID_UDF_WITHOUT_PARENT;
1272
1273 if (connectable && (len < 5)) {
1274 *lenp = 5;
1275 return 255;
1276 } else if (len < 3) {
1277 *lenp = 3;
1278 return 255;
1279 }
1280
1281 *lenp = 3;
1282 fid->udf.block = location.logicalBlockNum;
1283 fid->udf.partref = location.partitionReferenceNum;
1284 fid->udf.parent_partref = 0;
1285 fid->udf.generation = inode->i_generation;
1286
1287 if (connectable && !S_ISDIR(inode->i_mode)) {
1288 spin_lock(&de->d_lock);
1289 inode = de->d_parent->d_inode;
1290 location = UDF_I(inode)->i_location;
1291 fid->udf.parent_block = location.logicalBlockNum;
1292 fid->udf.parent_partref = location.partitionReferenceNum;
1293 fid->udf.parent_generation = inode->i_generation;
1294 spin_unlock(&de->d_lock);
1295 *lenp = 5;
1296 type = FILEID_UDF_WITH_PARENT;
1297 }
1298
1299 return type;
1300}
1301
1302const struct export_operations udf_export_ops = {
1303 .encode_fh = udf_encode_fh,
1304 .fh_to_dentry = udf_fh_to_dentry,
1305 .fh_to_parent = udf_fh_to_parent,
1306 .get_parent = udf_get_parent,
1307};
1308
1309const struct inode_operations udf_dir_inode_operations = {
1310 .lookup = udf_lookup,
1311 .create = udf_create,
1312 .link = udf_link,
1313 .unlink = udf_unlink,
1314 .symlink = udf_symlink,
1315 .mkdir = udf_mkdir,
1316 .rmdir = udf_rmdir,
1317 .mknod = udf_mknod,
1318 .rename = udf_rename,
1319};
1320const struct inode_operations udf_symlink_inode_operations = {
1321 .readlink = generic_readlink,
1322 .follow_link = page_follow_link_light,
1323 .put_link = page_put_link,
1324};