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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[linux-btrfs-devel.git] / fs / udf / namei.c
blobf1dce848ef966ea1853c9f50ce2d9cc997114a18
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/buffer_head.h>
31 #include <linux/sched.h>
32 #include <linux/crc-itu-t.h>
33 #include <linux/exportfs.h>
34
35 enum { UDF_MAX_LINKS = 0xffff };
36
37 static inline int udf_match(int len1, const unsigned char *name1, int len2,
38 const unsigned char *name2)
39 {
40 if (len1 != len2)
41 return 0;
42
43 return !memcmp(name1, name2, len1);
44 }
45
46 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
47 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
48 uint8_t *impuse, uint8_t *fileident)
49 {
50 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
51 uint16_t crc;
52 int offset;
53 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
54 uint8_t lfi = cfi->lengthFileIdent;
55 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
56 sizeof(struct fileIdentDesc);
57 int adinicb = 0;
58
59 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
60 adinicb = 1;
61
62 offset = fibh->soffset + sizeof(struct fileIdentDesc);
63
64 if (impuse) {
65 if (adinicb || (offset + liu < 0)) {
66 memcpy((uint8_t *)sfi->impUse, impuse, liu);
67 } else if (offset >= 0) {
68 memcpy(fibh->ebh->b_data + offset, impuse, liu);
69 } else {
70 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
71 memcpy(fibh->ebh->b_data, impuse - offset,
72 liu + offset);
73 }
74 }
75
76 offset += liu;
77
78 if (fileident) {
79 if (adinicb || (offset + lfi < 0)) {
80 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
81 } else if (offset >= 0) {
82 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
83 } else {
84 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
85 -offset);
86 memcpy(fibh->ebh->b_data, fileident - offset,
87 lfi + offset);
88 }
89 }
90
91 offset += lfi;
92
93 if (adinicb || (offset + padlen < 0)) {
94 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
95 } else if (offset >= 0) {
96 memset(fibh->ebh->b_data + offset, 0x00, padlen);
97 } else {
98 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
99 memset(fibh->ebh->b_data, 0x00, padlen + offset);
100 }
101
102 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
103 sizeof(struct fileIdentDesc) - sizeof(struct tag));
104
105 if (fibh->sbh == fibh->ebh) {
106 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
107 crclen + sizeof(struct tag) -
108 sizeof(struct fileIdentDesc));
109 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
110 crc = crc_itu_t(crc, fibh->ebh->b_data +
111 sizeof(struct fileIdentDesc) +
112 fibh->soffset,
113 crclen + sizeof(struct tag) -
114 sizeof(struct fileIdentDesc));
115 } else {
116 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
117 -fibh->soffset - sizeof(struct fileIdentDesc));
118 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
119 }
120
121 cfi->descTag.descCRC = cpu_to_le16(crc);
122 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
123 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
124
125 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
127 sizeof(struct fileIdentDesc));
128 } else {
129 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
130 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
131 sizeof(struct fileIdentDesc) + fibh->soffset);
132 }
133
134 if (adinicb) {
135 mark_inode_dirty(inode);
136 } else {
137 if (fibh->sbh != fibh->ebh)
138 mark_buffer_dirty_inode(fibh->ebh, inode);
139 mark_buffer_dirty_inode(fibh->sbh, inode);
140 }
141 return 0;
142 }
143
144 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
145 const struct qstr *child,
146 struct udf_fileident_bh *fibh,
147 struct fileIdentDesc *cfi)
148 {
149 struct fileIdentDesc *fi = NULL;
150 loff_t f_pos;
151 int block, flen;
152 unsigned char *fname = NULL;
153 unsigned char *nameptr;
154 uint8_t lfi;
155 uint16_t liu;
156 loff_t size;
157 struct kernel_lb_addr eloc;
158 uint32_t elen;
159 sector_t offset;
160 struct extent_position epos = {};
161 struct udf_inode_info *dinfo = UDF_I(dir);
162 int isdotdot = child->len == 2 &&
163 child->name[0] == '.' && child->name[1] == '.';
164
165 size = udf_ext0_offset(dir) + dir->i_size;
166 f_pos = udf_ext0_offset(dir);
167
168 fibh->sbh = fibh->ebh = NULL;
169 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
170 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
171 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
172 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
173 goto out_err;
174 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
175 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
176 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
177 epos.offset -= sizeof(struct short_ad);
178 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
179 epos.offset -= sizeof(struct long_ad);
180 } else
181 offset = 0;
182
183 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
184 if (!fibh->sbh)
185 goto out_err;
186 }
187
188 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
189 if (!fname)
190 goto out_err;
191
192 while (f_pos < size) {
193 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
194 &elen, &offset);
195 if (!fi)
196 goto out_err;
197
198 liu = le16_to_cpu(cfi->lengthOfImpUse);
199 lfi = cfi->lengthFileIdent;
200
201 if (fibh->sbh == fibh->ebh) {
202 nameptr = fi->fileIdent + liu;
203 } else {
204 int poffset; /* Unpaded ending offset */
205
206 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
207 liu + lfi;
208
209 if (poffset >= lfi)
210 nameptr = (uint8_t *)(fibh->ebh->b_data +
211 poffset - lfi);
212 else {
213 nameptr = fname;
214 memcpy(nameptr, fi->fileIdent + liu,
215 lfi - poffset);
216 memcpy(nameptr + lfi - poffset,
217 fibh->ebh->b_data, poffset);
218 }
219 }
220
221 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
222 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
223 continue;
224 }
225
226 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
227 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
228 continue;
229 }
230
231 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
232 isdotdot)
233 goto out_ok;
234
235 if (!lfi)
236 continue;
237
238 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
239 if (flen && udf_match(flen, fname, child->len, child->name))
240 goto out_ok;
241 }
242
243 out_err:
244 fi = NULL;
245 if (fibh->sbh != fibh->ebh)
246 brelse(fibh->ebh);
247 brelse(fibh->sbh);
248 out_ok:
249 brelse(epos.bh);
250 kfree(fname);
251
252 return fi;
253 }
254
255 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
256 struct nameidata *nd)
257 {
258 struct inode *inode = NULL;
259 struct fileIdentDesc cfi;
260 struct udf_fileident_bh fibh;
261
262 if (dentry->d_name.len > UDF_NAME_LEN - 2)
263 return ERR_PTR(-ENAMETOOLONG);
264
265 #ifdef UDF_RECOVERY
266 /* temporary shorthand for specifying files by inode number */
267 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
268 struct kernel_lb_addr lb = {
269 .logicalBlockNum = 0,
270 .partitionReferenceNum =
271 simple_strtoul(dentry->d_name.name + 3,
272 NULL, 0),
273 };
274 inode = udf_iget(dir->i_sb, lb);
275 if (!inode) {
276 return ERR_PTR(-EACCES);
277 }
278 } else
279 #endif /* UDF_RECOVERY */
280
281 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
282 struct kernel_lb_addr loc;
283
284 if (fibh.sbh != fibh.ebh)
285 brelse(fibh.ebh);
286 brelse(fibh.sbh);
287
288 loc = lelb_to_cpu(cfi.icb.extLocation);
289 inode = udf_iget(dir->i_sb, &loc);
290 if (!inode) {
291 return ERR_PTR(-EACCES);
292 }
293 }
294
295 return d_splice_alias(inode, dentry);
296 }
297
298 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
299 struct dentry *dentry,
300 struct udf_fileident_bh *fibh,
301 struct fileIdentDesc *cfi, int *err)
302 {
303 struct super_block *sb = dir->i_sb;
304 struct fileIdentDesc *fi = NULL;
305 unsigned char *name = NULL;
306 int namelen;
307 loff_t f_pos;
308 loff_t size = udf_ext0_offset(dir) + dir->i_size;
309 int nfidlen;
310 uint8_t lfi;
311 uint16_t liu;
312 int block;
313 struct kernel_lb_addr eloc;
314 uint32_t elen = 0;
315 sector_t offset;
316 struct extent_position epos = {};
317 struct udf_inode_info *dinfo;
318
319 fibh->sbh = fibh->ebh = NULL;
320 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
321 if (!name) {
322 *err = -ENOMEM;
323 goto out_err;
324 }
325
326 if (dentry) {
327 if (!dentry->d_name.len) {
328 *err = -EINVAL;
329 goto out_err;
330 }
331 namelen = udf_put_filename(sb, dentry->d_name.name, name,
332 dentry->d_name.len);
333 if (!namelen) {
334 *err = -ENAMETOOLONG;
335 goto out_err;
336 }
337 } else {
338 namelen = 0;
339 }
340
341 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
342
343 f_pos = udf_ext0_offset(dir);
344
345 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
346 dinfo = UDF_I(dir);
347 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
348 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
349 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
350 block = udf_get_lb_pblock(dir->i_sb,
351 &dinfo->i_location, 0);
352 fibh->soffset = fibh->eoffset = sb->s_blocksize;
353 goto add;
354 }
355 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
356 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
357 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
358 epos.offset -= sizeof(struct short_ad);
359 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
360 epos.offset -= sizeof(struct long_ad);
361 } else
362 offset = 0;
363
364 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
365 if (!fibh->sbh) {
366 *err = -EIO;
367 goto out_err;
368 }
369
370 block = dinfo->i_location.logicalBlockNum;
371 }
372
373 while (f_pos < size) {
374 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
375 &elen, &offset);
376
377 if (!fi) {
378 *err = -EIO;
379 goto out_err;
380 }
381
382 liu = le16_to_cpu(cfi->lengthOfImpUse);
383 lfi = cfi->lengthFileIdent;
384
385 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
386 if (((sizeof(struct fileIdentDesc) +
387 liu + lfi + 3) & ~3) == nfidlen) {
388 cfi->descTag.tagSerialNum = cpu_to_le16(1);
389 cfi->fileVersionNum = cpu_to_le16(1);
390 cfi->fileCharacteristics = 0;
391 cfi->lengthFileIdent = namelen;
392 cfi->lengthOfImpUse = cpu_to_le16(0);
393 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
394 name))
395 goto out_ok;
396 else {
397 *err = -EIO;
398 goto out_err;
399 }
400 }
401 }
402 }
403
404 add:
405 f_pos += nfidlen;
406
407 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
408 sb->s_blocksize - fibh->eoffset < nfidlen) {
409 brelse(epos.bh);
410 epos.bh = NULL;
411 fibh->soffset -= udf_ext0_offset(dir);
412 fibh->eoffset -= udf_ext0_offset(dir);
413 f_pos -= udf_ext0_offset(dir);
414 if (fibh->sbh != fibh->ebh)
415 brelse(fibh->ebh);
416 brelse(fibh->sbh);
417 fibh->sbh = fibh->ebh =
418 udf_expand_dir_adinicb(dir, &block, err);
419 if (!fibh->sbh)
420 goto out_err;
421 epos.block = dinfo->i_location;
422 epos.offset = udf_file_entry_alloc_offset(dir);
423 /* Load extent udf_expand_dir_adinicb() has created */
424 udf_current_aext(dir, &epos, &eloc, &elen, 1);
425 }
426
427 /* Entry fits into current block? */
428 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
429 fibh->soffset = fibh->eoffset;
430 fibh->eoffset += nfidlen;
431 if (fibh->sbh != fibh->ebh) {
432 brelse(fibh->sbh);
433 fibh->sbh = fibh->ebh;
434 }
435
436 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
437 block = dinfo->i_location.logicalBlockNum;
438 fi = (struct fileIdentDesc *)
439 (dinfo->i_ext.i_data +
440 fibh->soffset -
441 udf_ext0_offset(dir) +
442 dinfo->i_lenEAttr);
443 } else {
444 block = eloc.logicalBlockNum +
445 ((elen - 1) >>
446 dir->i_sb->s_blocksize_bits);
447 fi = (struct fileIdentDesc *)
448 (fibh->sbh->b_data + fibh->soffset);
449 }
450 } else {
451 /* Round up last extent in the file */
452 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
453 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
454 epos.offset -= sizeof(struct short_ad);
455 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
456 epos.offset -= sizeof(struct long_ad);
457 udf_write_aext(dir, &epos, &eloc, elen, 1);
458 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
459 - 1) & ~(sb->s_blocksize - 1);
460
461 fibh->soffset = fibh->eoffset - sb->s_blocksize;
462 fibh->eoffset += nfidlen - sb->s_blocksize;
463 if (fibh->sbh != fibh->ebh) {
464 brelse(fibh->sbh);
465 fibh->sbh = fibh->ebh;
466 }
467
468 block = eloc.logicalBlockNum + ((elen - 1) >>
469 dir->i_sb->s_blocksize_bits);
470 fibh->ebh = udf_bread(dir,
471 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
472 if (!fibh->ebh)
473 goto out_err;
474 /* Extents could have been merged, invalidate our position */
475 brelse(epos.bh);
476 epos.bh = NULL;
477 epos.block = dinfo->i_location;
478 epos.offset = udf_file_entry_alloc_offset(dir);
479
480 if (!fibh->soffset) {
481 /* Find the freshly allocated block */
482 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
483 (EXT_RECORDED_ALLOCATED >> 30))
484 ;
485 block = eloc.logicalBlockNum + ((elen - 1) >>
486 dir->i_sb->s_blocksize_bits);
487 brelse(fibh->sbh);
488 fibh->sbh = fibh->ebh;
489 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
490 } else {
491 fi = (struct fileIdentDesc *)
492 (fibh->sbh->b_data + sb->s_blocksize +
493 fibh->soffset);
494 }
495 }
496
497 memset(cfi, 0, sizeof(struct fileIdentDesc));
498 if (UDF_SB(sb)->s_udfrev >= 0x0200)
499 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
500 sizeof(struct tag));
501 else
502 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
503 sizeof(struct tag));
504 cfi->fileVersionNum = cpu_to_le16(1);
505 cfi->lengthFileIdent = namelen;
506 cfi->lengthOfImpUse = cpu_to_le16(0);
507 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
508 dir->i_size += nfidlen;
509 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
510 dinfo->i_lenAlloc += nfidlen;
511 else {
512 /* Find the last extent and truncate it to proper size */
513 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
514 (EXT_RECORDED_ALLOCATED >> 30))
515 ;
516 elen -= dinfo->i_lenExtents - dir->i_size;
517 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
518 epos.offset -= sizeof(struct short_ad);
519 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
520 epos.offset -= sizeof(struct long_ad);
521 udf_write_aext(dir, &epos, &eloc, elen, 1);
522 dinfo->i_lenExtents = dir->i_size;
523 }
524
525 mark_inode_dirty(dir);
526 goto out_ok;
527 } else {
528 *err = -EIO;
529 goto out_err;
530 }
531
532 out_err:
533 fi = NULL;
534 if (fibh->sbh != fibh->ebh)
535 brelse(fibh->ebh);
536 brelse(fibh->sbh);
537 out_ok:
538 brelse(epos.bh);
539 kfree(name);
540 return fi;
541 }
542
543 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
544 struct udf_fileident_bh *fibh,
545 struct fileIdentDesc *cfi)
546 {
547 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
548
549 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
550 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
551
552 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
553 }
554
555 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
556 struct nameidata *nd)
557 {
558 struct udf_fileident_bh fibh;
559 struct inode *inode;
560 struct fileIdentDesc cfi, *fi;
561 int err;
562 struct udf_inode_info *iinfo;
563
564 inode = udf_new_inode(dir, mode, &err);
565 if (!inode) {
566 return err;
567 }
568
569 iinfo = UDF_I(inode);
570 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
571 inode->i_data.a_ops = &udf_adinicb_aops;
572 else
573 inode->i_data.a_ops = &udf_aops;
574 inode->i_op = &udf_file_inode_operations;
575 inode->i_fop = &udf_file_operations;
576 mark_inode_dirty(inode);
577
578 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
579 if (!fi) {
580 inode->i_nlink--;
581 mark_inode_dirty(inode);
582 iput(inode);
583 return err;
584 }
585 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
586 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
587 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
588 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
589 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
590 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
591 mark_inode_dirty(dir);
592 if (fibh.sbh != fibh.ebh)
593 brelse(fibh.ebh);
594 brelse(fibh.sbh);
595 d_instantiate(dentry, inode);
596
597 return 0;
598 }
599
600 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
601 dev_t rdev)
602 {
603 struct inode *inode;
604 struct udf_fileident_bh fibh;
605 struct fileIdentDesc cfi, *fi;
606 int err;
607 struct udf_inode_info *iinfo;
608
609 if (!old_valid_dev(rdev))
610 return -EINVAL;
611
612 err = -EIO;
613 inode = udf_new_inode(dir, mode, &err);
614 if (!inode)
615 goto out;
616
617 iinfo = UDF_I(inode);
618 init_special_inode(inode, mode, rdev);
619 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
620 if (!fi) {
621 inode->i_nlink--;
622 mark_inode_dirty(inode);
623 iput(inode);
624 return err;
625 }
626 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
627 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
628 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
629 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
630 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
631 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
632 mark_inode_dirty(dir);
633 mark_inode_dirty(inode);
634
635 if (fibh.sbh != fibh.ebh)
636 brelse(fibh.ebh);
637 brelse(fibh.sbh);
638 d_instantiate(dentry, inode);
639 err = 0;
640
641 out:
642 return err;
643 }
644
645 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
646 {
647 struct inode *inode;
648 struct udf_fileident_bh fibh;
649 struct fileIdentDesc cfi, *fi;
650 int err;
651 struct udf_inode_info *dinfo = UDF_I(dir);
652 struct udf_inode_info *iinfo;
653
654 err = -EMLINK;
655 if (dir->i_nlink >= UDF_MAX_LINKS)
656 goto out;
657
658 err = -EIO;
659 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
660 if (!inode)
661 goto out;
662
663 iinfo = UDF_I(inode);
664 inode->i_op = &udf_dir_inode_operations;
665 inode->i_fop = &udf_dir_operations;
666 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
667 if (!fi) {
668 inode->i_nlink--;
669 mark_inode_dirty(inode);
670 iput(inode);
671 goto out;
672 }
673 inode->i_nlink = 2;
674 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
675 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
676 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
677 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
678 cfi.fileCharacteristics =
679 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
680 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
681 brelse(fibh.sbh);
682 mark_inode_dirty(inode);
683
684 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
685 if (!fi) {
686 inode->i_nlink = 0;
687 mark_inode_dirty(inode);
688 iput(inode);
689 goto out;
690 }
691 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
692 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
693 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
694 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
695 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
696 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
697 inc_nlink(dir);
698 mark_inode_dirty(dir);
699 d_instantiate(dentry, inode);
700 if (fibh.sbh != fibh.ebh)
701 brelse(fibh.ebh);
702 brelse(fibh.sbh);
703 err = 0;
704
705 out:
706 return err;
707 }
708
709 static int empty_dir(struct inode *dir)
710 {
711 struct fileIdentDesc *fi, cfi;
712 struct udf_fileident_bh fibh;
713 loff_t f_pos;
714 loff_t size = udf_ext0_offset(dir) + dir->i_size;
715 int block;
716 struct kernel_lb_addr eloc;
717 uint32_t elen;
718 sector_t offset;
719 struct extent_position epos = {};
720 struct udf_inode_info *dinfo = UDF_I(dir);
721
722 f_pos = udf_ext0_offset(dir);
723 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
724
725 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
726 fibh.sbh = fibh.ebh = NULL;
727 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
728 &epos, &eloc, &elen, &offset) ==
729 (EXT_RECORDED_ALLOCATED >> 30)) {
730 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
731 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
732 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
733 epos.offset -= sizeof(struct short_ad);
734 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
735 epos.offset -= sizeof(struct long_ad);
736 } else
737 offset = 0;
738
739 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
740 if (!fibh.sbh) {
741 brelse(epos.bh);
742 return 0;
743 }
744 } else {
745 brelse(epos.bh);
746 return 0;
747 }
748
749 while (f_pos < size) {
750 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
751 &elen, &offset);
752 if (!fi) {
753 if (fibh.sbh != fibh.ebh)
754 brelse(fibh.ebh);
755 brelse(fibh.sbh);
756 brelse(epos.bh);
757 return 0;
758 }
759
760 if (cfi.lengthFileIdent &&
761 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
762 if (fibh.sbh != fibh.ebh)
763 brelse(fibh.ebh);
764 brelse(fibh.sbh);
765 brelse(epos.bh);
766 return 0;
767 }
768 }
769
770 if (fibh.sbh != fibh.ebh)
771 brelse(fibh.ebh);
772 brelse(fibh.sbh);
773 brelse(epos.bh);
774
775 return 1;
776 }
777
778 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
779 {
780 int retval;
781 struct inode *inode = dentry->d_inode;
782 struct udf_fileident_bh fibh;
783 struct fileIdentDesc *fi, cfi;
784 struct kernel_lb_addr tloc;
785
786 retval = -ENOENT;
787 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
788 if (!fi)
789 goto out;
790
791 retval = -EIO;
792 tloc = lelb_to_cpu(cfi.icb.extLocation);
793 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
794 goto end_rmdir;
795 retval = -ENOTEMPTY;
796 if (!empty_dir(inode))
797 goto end_rmdir;
798 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
799 if (retval)
800 goto end_rmdir;
801 if (inode->i_nlink != 2)
802 udf_warning(inode->i_sb, "udf_rmdir",
803 "empty directory has nlink != 2 (%d)",
804 inode->i_nlink);
805 clear_nlink(inode);
806 inode->i_size = 0;
807 inode_dec_link_count(dir);
808 inode->i_ctime = dir->i_ctime = dir->i_mtime =
809 current_fs_time(dir->i_sb);
810 mark_inode_dirty(dir);
811
812 end_rmdir:
813 if (fibh.sbh != fibh.ebh)
814 brelse(fibh.ebh);
815 brelse(fibh.sbh);
816
817 out:
818 return retval;
819 }
820
821 static int udf_unlink(struct inode *dir, struct dentry *dentry)
822 {
823 int retval;
824 struct inode *inode = dentry->d_inode;
825 struct udf_fileident_bh fibh;
826 struct fileIdentDesc *fi;
827 struct fileIdentDesc cfi;
828 struct kernel_lb_addr tloc;
829
830 retval = -ENOENT;
831 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
832 if (!fi)
833 goto out;
834
835 retval = -EIO;
836 tloc = lelb_to_cpu(cfi.icb.extLocation);
837 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
838 goto end_unlink;
839
840 if (!inode->i_nlink) {
841 udf_debug("Deleting nonexistent file (%lu), %d\n",
842 inode->i_ino, inode->i_nlink);
843 inode->i_nlink = 1;
844 }
845 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
846 if (retval)
847 goto end_unlink;
848 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
849 mark_inode_dirty(dir);
850 inode_dec_link_count(inode);
851 inode->i_ctime = dir->i_ctime;
852 retval = 0;
853
854 end_unlink:
855 if (fibh.sbh != fibh.ebh)
856 brelse(fibh.ebh);
857 brelse(fibh.sbh);
858
859 out:
860 return retval;
861 }
862
863 static int udf_symlink(struct inode *dir, struct dentry *dentry,
864 const char *symname)
865 {
866 struct inode *inode;
867 struct pathComponent *pc;
868 const char *compstart;
869 struct udf_fileident_bh fibh;
870 struct extent_position epos = {};
871 int eoffset, elen = 0;
872 struct fileIdentDesc *fi;
873 struct fileIdentDesc cfi;
874 uint8_t *ea;
875 int err;
876 int block;
877 unsigned char *name = NULL;
878 int namelen;
879 struct udf_inode_info *iinfo;
880 struct super_block *sb = dir->i_sb;
881
882 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
883 if (!inode)
884 goto out;
885
886 iinfo = UDF_I(inode);
887 down_write(&iinfo->i_data_sem);
888 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
889 if (!name) {
890 err = -ENOMEM;
891 goto out_no_entry;
892 }
893
894 inode->i_data.a_ops = &udf_symlink_aops;
895 inode->i_op = &udf_symlink_inode_operations;
896
897 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
898 struct kernel_lb_addr eloc;
899 uint32_t bsize;
900
901 block = udf_new_block(sb, inode,
902 iinfo->i_location.partitionReferenceNum,
903 iinfo->i_location.logicalBlockNum, &err);
904 if (!block)
905 goto out_no_entry;
906 epos.block = iinfo->i_location;
907 epos.offset = udf_file_entry_alloc_offset(inode);
908 epos.bh = NULL;
909 eloc.logicalBlockNum = block;
910 eloc.partitionReferenceNum =
911 iinfo->i_location.partitionReferenceNum;
912 bsize = sb->s_blocksize;
913 iinfo->i_lenExtents = bsize;
914 udf_add_aext(inode, &epos, &eloc, bsize, 0);
915 brelse(epos.bh);
916
917 block = udf_get_pblock(sb, block,
918 iinfo->i_location.partitionReferenceNum,
919 0);
920 epos.bh = udf_tgetblk(sb, block);
921 lock_buffer(epos.bh);
922 memset(epos.bh->b_data, 0x00, bsize);
923 set_buffer_uptodate(epos.bh);
924 unlock_buffer(epos.bh);
925 mark_buffer_dirty_inode(epos.bh, inode);
926 ea = epos.bh->b_data + udf_ext0_offset(inode);
927 } else
928 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
929
930 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
931 pc = (struct pathComponent *)ea;
932
933 if (*symname == '/') {
934 do {
935 symname++;
936 } while (*symname == '/');
937
938 pc->componentType = 1;
939 pc->lengthComponentIdent = 0;
940 pc->componentFileVersionNum = 0;
941 elen += sizeof(struct pathComponent);
942 }
943
944 err = -ENAMETOOLONG;
945
946 while (*symname) {
947 if (elen + sizeof(struct pathComponent) > eoffset)
948 goto out_no_entry;
949
950 pc = (struct pathComponent *)(ea + elen);
951
952 compstart = symname;
953
954 do {
955 symname++;
956 } while (*symname && *symname != '/');
957
958 pc->componentType = 5;
959 pc->lengthComponentIdent = 0;
960 pc->componentFileVersionNum = 0;
961 if (compstart[0] == '.') {
962 if ((symname - compstart) == 1)
963 pc->componentType = 4;
964 else if ((symname - compstart) == 2 &&
965 compstart[1] == '.')
966 pc->componentType = 3;
967 }
968
969 if (pc->componentType == 5) {
970 namelen = udf_put_filename(sb, compstart, name,
971 symname - compstart);
972 if (!namelen)
973 goto out_no_entry;
974
975 if (elen + sizeof(struct pathComponent) + namelen >
976 eoffset)
977 goto out_no_entry;
978 else
979 pc->lengthComponentIdent = namelen;
980
981 memcpy(pc->componentIdent, name, namelen);
982 }
983
984 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
985
986 if (*symname) {
987 do {
988 symname++;
989 } while (*symname == '/');
990 }
991 }
992
993 brelse(epos.bh);
994 inode->i_size = elen;
995 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
996 iinfo->i_lenAlloc = inode->i_size;
997 else
998 udf_truncate_tail_extent(inode);
999 mark_inode_dirty(inode);
1000
1001 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1002 if (!fi)
1003 goto out_no_entry;
1004 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1005 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1006 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1007 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1008 cpu_to_le32(lvid_get_unique_id(sb));
1009 }
1010 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1011 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1012 mark_inode_dirty(dir);
1013 up_write(&iinfo->i_data_sem);
1014 if (fibh.sbh != fibh.ebh)
1015 brelse(fibh.ebh);
1016 brelse(fibh.sbh);
1017 d_instantiate(dentry, inode);
1018 err = 0;
1019
1020 out:
1021 kfree(name);
1022 return err;
1023
1024 out_no_entry:
1025 up_write(&iinfo->i_data_sem);
1026 inode_dec_link_count(inode);
1027 iput(inode);
1028 goto out;
1029 }
1030
1031 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1032 struct dentry *dentry)
1033 {
1034 struct inode *inode = old_dentry->d_inode;
1035 struct udf_fileident_bh fibh;
1036 struct fileIdentDesc cfi, *fi;
1037 int err;
1038
1039 if (inode->i_nlink >= UDF_MAX_LINKS)
1040 return -EMLINK;
1041
1042 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1043 if (!fi) {
1044 return err;
1045 }
1046 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1047 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1048 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1049 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1050 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1051 }
1052 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1053 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1054 mark_inode_dirty(dir);
1055
1056 if (fibh.sbh != fibh.ebh)
1057 brelse(fibh.ebh);
1058 brelse(fibh.sbh);
1059 inc_nlink(inode);
1060 inode->i_ctime = current_fs_time(inode->i_sb);
1061 mark_inode_dirty(inode);
1062 ihold(inode);
1063 d_instantiate(dentry, inode);
1064
1065 return 0;
1066 }
1067
1068 /* Anybody can rename anything with this: the permission checks are left to the
1069 * higher-level routines.
1070 */
1071 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1072 struct inode *new_dir, struct dentry *new_dentry)
1073 {
1074 struct inode *old_inode = old_dentry->d_inode;
1075 struct inode *new_inode = new_dentry->d_inode;
1076 struct udf_fileident_bh ofibh, nfibh;
1077 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1078 struct fileIdentDesc ocfi, ncfi;
1079 struct buffer_head *dir_bh = NULL;
1080 int retval = -ENOENT;
1081 struct kernel_lb_addr tloc;
1082 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1083
1084 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1085 if (ofi) {
1086 if (ofibh.sbh != ofibh.ebh)
1087 brelse(ofibh.ebh);
1088 brelse(ofibh.sbh);
1089 }
1090 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1091 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1092 != old_inode->i_ino)
1093 goto end_rename;
1094
1095 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1096 if (nfi) {
1097 if (!new_inode) {
1098 if (nfibh.sbh != nfibh.ebh)
1099 brelse(nfibh.ebh);
1100 brelse(nfibh.sbh);
1101 nfi = NULL;
1102 }
1103 }
1104 if (S_ISDIR(old_inode->i_mode)) {
1105 int offset = udf_ext0_offset(old_inode);
1106
1107 if (new_inode) {
1108 retval = -ENOTEMPTY;
1109 if (!empty_dir(new_inode))
1110 goto end_rename;
1111 }
1112 retval = -EIO;
1113 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1114 dir_fi = udf_get_fileident(
1115 old_iinfo->i_ext.i_data -
1116 (old_iinfo->i_efe ?
1117 sizeof(struct extendedFileEntry) :
1118 sizeof(struct fileEntry)),
1119 old_inode->i_sb->s_blocksize, &offset);
1120 } else {
1121 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1122 if (!dir_bh)
1123 goto end_rename;
1124 dir_fi = udf_get_fileident(dir_bh->b_data,
1125 old_inode->i_sb->s_blocksize, &offset);
1126 }
1127 if (!dir_fi)
1128 goto end_rename;
1129 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1130 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1131 old_dir->i_ino)
1132 goto end_rename;
1133
1134 retval = -EMLINK;
1135 if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
1136 goto end_rename;
1137 }
1138 if (!nfi) {
1139 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1140 &retval);
1141 if (!nfi)
1142 goto end_rename;
1143 }
1144
1145 /*
1146 * Like most other Unix systems, set the ctime for inodes on a
1147 * rename.
1148 */
1149 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1150 mark_inode_dirty(old_inode);
1151
1152 /*
1153 * ok, that's it
1154 */
1155 ncfi.fileVersionNum = ocfi.fileVersionNum;
1156 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1157 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1158 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1159
1160 /* The old fid may have moved - find it again */
1161 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1162 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1163
1164 if (new_inode) {
1165 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1166 inode_dec_link_count(new_inode);
1167 }
1168 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1169 mark_inode_dirty(old_dir);
1170
1171 if (dir_fi) {
1172 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1173 udf_update_tag((char *)dir_fi,
1174 (sizeof(struct fileIdentDesc) +
1175 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1176 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1177 mark_inode_dirty(old_inode);
1178 else
1179 mark_buffer_dirty_inode(dir_bh, old_inode);
1180
1181 inode_dec_link_count(old_dir);
1182 if (new_inode)
1183 inode_dec_link_count(new_inode);
1184 else {
1185 inc_nlink(new_dir);
1186 mark_inode_dirty(new_dir);
1187 }
1188 }
1189
1190 if (ofi) {
1191 if (ofibh.sbh != ofibh.ebh)
1192 brelse(ofibh.ebh);
1193 brelse(ofibh.sbh);
1194 }
1195
1196 retval = 0;
1197
1198 end_rename:
1199 brelse(dir_bh);
1200 if (nfi) {
1201 if (nfibh.sbh != nfibh.ebh)
1202 brelse(nfibh.ebh);
1203 brelse(nfibh.sbh);
1204 }
1205
1206 return retval;
1207 }
1208
1209 static struct dentry *udf_get_parent(struct dentry *child)
1210 {
1211 struct kernel_lb_addr tloc;
1212 struct inode *inode = NULL;
1213 struct qstr dotdot = {.name = "..", .len = 2};
1214 struct fileIdentDesc cfi;
1215 struct udf_fileident_bh fibh;
1216
1217 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1218 goto out_unlock;
1219
1220 if (fibh.sbh != fibh.ebh)
1221 brelse(fibh.ebh);
1222 brelse(fibh.sbh);
1223
1224 tloc = lelb_to_cpu(cfi.icb.extLocation);
1225 inode = udf_iget(child->d_inode->i_sb, &tloc);
1226 if (!inode)
1227 goto out_unlock;
1228
1229 return d_obtain_alias(inode);
1230 out_unlock:
1231 return ERR_PTR(-EACCES);
1232 }
1233
1234
1235 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1236 u16 partref, __u32 generation)
1237 {
1238 struct inode *inode;
1239 struct kernel_lb_addr loc;
1240
1241 if (block == 0)
1242 return ERR_PTR(-ESTALE);
1243
1244 loc.logicalBlockNum = block;
1245 loc.partitionReferenceNum = partref;
1246 inode = udf_iget(sb, &loc);
1247
1248 if (inode == NULL)
1249 return ERR_PTR(-ENOMEM);
1250
1251 if (generation && inode->i_generation != generation) {
1252 iput(inode);
1253 return ERR_PTR(-ESTALE);
1254 }
1255 return d_obtain_alias(inode);
1256 }
1257
1258 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1259 struct fid *fid, int fh_len, int fh_type)
1260 {
1261 if ((fh_len != 3 && fh_len != 5) ||
1262 (fh_type != FILEID_UDF_WITH_PARENT &&
1263 fh_type != FILEID_UDF_WITHOUT_PARENT))
1264 return NULL;
1265
1266 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1267 fid->udf.generation);
1268 }
1269
1270 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1271 struct fid *fid, int fh_len, int fh_type)
1272 {
1273 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1274 return NULL;
1275
1276 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1277 fid->udf.parent_partref,
1278 fid->udf.parent_generation);
1279 }
1280 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1281 int connectable)
1282 {
1283 int len = *lenp;
1284 struct inode *inode = de->d_inode;
1285 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1286 struct fid *fid = (struct fid *)fh;
1287 int type = FILEID_UDF_WITHOUT_PARENT;
1288
1289 if (connectable && (len < 5)) {
1290 *lenp = 5;
1291 return 255;
1292 } else if (len < 3) {
1293 *lenp = 3;
1294 return 255;
1295 }
1296
1297 *lenp = 3;
1298 fid->udf.block = location.logicalBlockNum;
1299 fid->udf.partref = location.partitionReferenceNum;
1300 fid->udf.generation = inode->i_generation;
1301
1302 if (connectable && !S_ISDIR(inode->i_mode)) {
1303 spin_lock(&de->d_lock);
1304 inode = de->d_parent->d_inode;
1305 location = UDF_I(inode)->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 spin_unlock(&de->d_lock);
1310 *lenp = 5;
1311 type = FILEID_UDF_WITH_PARENT;
1312 }
1313
1314 return type;
1315 }
1316
1317 const struct export_operations udf_export_ops = {
1318 .encode_fh = udf_encode_fh,
1319 .fh_to_dentry = udf_fh_to_dentry,
1320 .fh_to_parent = udf_fh_to_parent,
1321 .get_parent = udf_get_parent,
1322 };
1323
1324 const struct inode_operations udf_dir_inode_operations = {
1325 .lookup = udf_lookup,
1326 .create = udf_create,
1327 .link = udf_link,
1328 .unlink = udf_unlink,
1329 .symlink = udf_symlink,
1330 .mkdir = udf_mkdir,
1331 .rmdir = udf_rmdir,
1332 .mknod = udf_mknod,
1333 .rename = udf_rename,
1334 };
1335 const struct inode_operations udf_symlink_inode_operations = {
1336 .readlink = generic_readlink,
1337 .follow_link = page_follow_link_light,
1338 .put_link = page_put_link,
1339 };
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