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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(udf_get_fi_ident(sfi), fileident, lfi);
78 } else if (offset >= 0) {
79 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
80 } else {
81 memcpy(udf_get_fi_ident(sfi), fileident, -offset);
82 memcpy(fibh->ebh->b_data, fileident - offset,
83 lfi + offset);
84 }
85 }
86
87 offset += lfi;
88
89 if (adinicb || (offset + padlen < 0)) {
90 memset(udf_get_fi_ident(sfi) + lfi, 0x00, padlen);
91 } else if (offset >= 0) {
92 memset(fibh->ebh->b_data + offset, 0x00, padlen);
93 } else {
94 memset(udf_get_fi_ident(sfi) + lfi, 0x00, -offset);
95 memset(fibh->ebh->b_data, 0x00, padlen + offset);
96 }
97
98 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
99 sizeof(struct fileIdentDesc) - sizeof(struct tag));
100
101 if (fibh->sbh == fibh->ebh) {
102 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
103 crclen + sizeof(struct tag) -
104 sizeof(struct fileIdentDesc));
105 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
106 crc = crc_itu_t(crc, fibh->ebh->b_data +
107 sizeof(struct fileIdentDesc) +
108 fibh->soffset,
109 crclen + sizeof(struct tag) -
110 sizeof(struct fileIdentDesc));
111 } else {
112 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
113 -fibh->soffset - sizeof(struct fileIdentDesc));
114 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
115 }
116
117 cfi->descTag.descCRC = cpu_to_le16(crc);
118 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
119 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
120
121 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
122 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
123 sizeof(struct fileIdentDesc));
124 } else {
125 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
126 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
127 sizeof(struct fileIdentDesc) + fibh->soffset);
128 }
129
130 if (adinicb) {
131 mark_inode_dirty(inode);
132 } else {
133 if (fibh->sbh != fibh->ebh)
134 mark_buffer_dirty_inode(fibh->ebh, inode);
135 mark_buffer_dirty_inode(fibh->sbh, inode);
136 }
137 return 0;
138 }
139
140 /**
141 * udf_find_entry - find entry in given directory.
142 *
143 * @dir: directory inode to search in
144 * @child: qstr of the name
145 * @fibh: buffer head / inode with file identifier descriptor we found
146 * @cfi: found file identifier descriptor with given name
147 *
148 * This function searches in the directory @dir for a file name @child. When
149 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
150 * directories) containing the file identifier descriptor (FID). In that case
151 * the function returns pointer to the FID in the buffer or inode - but note
152 * that FID may be split among two buffers (blocks) so accessing it via that
153 * pointer isn't easily possible. This pointer can be used only as an iterator
154 * for other directory manipulation functions. For inspection of the FID @cfi
155 * can be used - the found FID is copied there.
156 *
157 * Returns pointer to FID, NULL when nothing found, or error code.
158 */
159 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
160 const struct qstr *child,
161 struct udf_fileident_bh *fibh,
162 struct fileIdentDesc *cfi)
163 {
164 struct fileIdentDesc *fi = NULL;
165 loff_t f_pos;
166 udf_pblk_t block;
167 int flen;
168 unsigned char *fname = NULL, *copy_name = NULL;
169 unsigned char *nameptr;
170 uint8_t lfi;
171 uint16_t liu;
172 loff_t size;
173 struct kernel_lb_addr eloc;
174 uint32_t elen;
175 sector_t offset;
176 struct extent_position epos = {};
177 struct udf_inode_info *dinfo = UDF_I(dir);
178 int isdotdot = child->len == 2 &&
179 child->name[0] == '.' && child->name[1] == '.';
180 struct super_block *sb = dir->i_sb;
181
182 size = udf_ext0_offset(dir) + dir->i_size;
183 f_pos = udf_ext0_offset(dir);
184
185 fibh->sbh = fibh->ebh = NULL;
186 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
187 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
188 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
189 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
190 fi = ERR_PTR(-EIO);
191 goto out_err;
192 }
193
194 block = udf_get_lb_pblock(sb, &eloc, offset);
195 if ((++offset << sb->s_blocksize_bits) < elen) {
196 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
197 epos.offset -= sizeof(struct short_ad);
198 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
199 epos.offset -= sizeof(struct long_ad);
200 } else
201 offset = 0;
202
203 fibh->sbh = fibh->ebh = udf_tread(sb, block);
204 if (!fibh->sbh) {
205 fi = ERR_PTR(-EIO);
206 goto out_err;
207 }
208 }
209
210 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
211 if (!fname) {
212 fi = ERR_PTR(-ENOMEM);
213 goto out_err;
214 }
215
216 while (f_pos < size) {
217 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
218 &elen, &offset);
219 if (!fi) {
220 fi = ERR_PTR(-EIO);
221 goto out_err;
222 }
223
224 liu = le16_to_cpu(cfi->lengthOfImpUse);
225 lfi = cfi->lengthFileIdent;
226
227 if (fibh->sbh == fibh->ebh) {
228 nameptr = udf_get_fi_ident(fi);
229 } else {
230 int poffset; /* Unpaded ending offset */
231
232 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
233 liu + lfi;
234
235 if (poffset >= lfi)
236 nameptr = (uint8_t *)(fibh->ebh->b_data +
237 poffset - lfi);
238 else {
239 if (!copy_name) {
240 copy_name = kmalloc(UDF_NAME_LEN,
241 GFP_NOFS);
242 if (!copy_name) {
243 fi = ERR_PTR(-ENOMEM);
244 goto out_err;
245 }
246 }
247 nameptr = copy_name;
248 memcpy(nameptr, udf_get_fi_ident(fi),
249 lfi - poffset);
250 memcpy(nameptr + lfi - poffset,
251 fibh->ebh->b_data, poffset);
252 }
253 }
254
255 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
256 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
257 continue;
258 }
259
260 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
261 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
262 continue;
263 }
264
265 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
266 isdotdot)
267 goto out_ok;
268
269 if (!lfi)
270 continue;
271
272 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
273 if (flen < 0) {
274 fi = ERR_PTR(flen);
275 goto out_err;
276 }
277
278 if (udf_match(flen, fname, child->len, child->name))
279 goto out_ok;
280 }
281
282 fi = NULL;
283 out_err:
284 if (fibh->sbh != fibh->ebh)
285 brelse(fibh->ebh);
286 brelse(fibh->sbh);
287 out_ok:
288 brelse(epos.bh);
289 kfree(fname);
290 kfree(copy_name);
291
292 return fi;
293 }
294
295 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
296 unsigned int flags)
297 {
298 struct inode *inode = NULL;
299 struct fileIdentDesc cfi;
300 struct udf_fileident_bh fibh;
301 struct fileIdentDesc *fi;
302
303 if (dentry->d_name.len > UDF_NAME_LEN)
304 return ERR_PTR(-ENAMETOOLONG);
305
306 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
307 if (IS_ERR(fi))
308 return ERR_CAST(fi);
309
310 if (fi) {
311 struct kernel_lb_addr loc;
312
313 if (fibh.sbh != fibh.ebh)
314 brelse(fibh.ebh);
315 brelse(fibh.sbh);
316
317 loc = lelb_to_cpu(cfi.icb.extLocation);
318 inode = udf_iget(dir->i_sb, &loc);
319 if (IS_ERR(inode))
320 return ERR_CAST(inode);
321 }
322
323 return d_splice_alias(inode, dentry);
324 }
325
326 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
327 struct dentry *dentry,
328 struct udf_fileident_bh *fibh,
329 struct fileIdentDesc *cfi, int *err)
330 {
331 struct super_block *sb = dir->i_sb;
332 struct fileIdentDesc *fi = NULL;
333 unsigned char *name = NULL;
334 int namelen;
335 loff_t f_pos;
336 loff_t size = udf_ext0_offset(dir) + dir->i_size;
337 int nfidlen;
338 udf_pblk_t block;
339 struct kernel_lb_addr eloc;
340 uint32_t elen = 0;
341 sector_t offset;
342 struct extent_position epos = {};
343 struct udf_inode_info *dinfo;
344
345 fibh->sbh = fibh->ebh = NULL;
346 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
347 if (!name) {
348 *err = -ENOMEM;
349 goto out_err;
350 }
351
352 if (dentry) {
353 if (!dentry->d_name.len) {
354 *err = -EINVAL;
355 goto out_err;
356 }
357 namelen = udf_put_filename(sb, dentry->d_name.name,
358 dentry->d_name.len,
359 name, UDF_NAME_LEN_CS0);
360 if (!namelen) {
361 *err = -ENAMETOOLONG;
362 goto out_err;
363 }
364 } else {
365 namelen = 0;
366 }
367
368 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
369
370 f_pos = udf_ext0_offset(dir);
371
372 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
373 dinfo = UDF_I(dir);
374 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
375 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
376 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
377 block = udf_get_lb_pblock(dir->i_sb,
378 &dinfo->i_location, 0);
379 fibh->soffset = fibh->eoffset = sb->s_blocksize;
380 goto add;
381 }
382 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
383 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
384 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
385 epos.offset -= sizeof(struct short_ad);
386 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
387 epos.offset -= sizeof(struct long_ad);
388 } else
389 offset = 0;
390
391 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
392 if (!fibh->sbh) {
393 *err = -EIO;
394 goto out_err;
395 }
396
397 block = dinfo->i_location.logicalBlockNum;
398 }
399
400 while (f_pos < size) {
401 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
402 &elen, &offset);
403
404 if (!fi) {
405 *err = -EIO;
406 goto out_err;
407 }
408
409 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
410 if (udf_dir_entry_len(cfi) == nfidlen) {
411 cfi->descTag.tagSerialNum = cpu_to_le16(1);
412 cfi->fileVersionNum = cpu_to_le16(1);
413 cfi->fileCharacteristics = 0;
414 cfi->lengthFileIdent = namelen;
415 cfi->lengthOfImpUse = cpu_to_le16(0);
416 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
417 name))
418 goto out_ok;
419 else {
420 *err = -EIO;
421 goto out_err;
422 }
423 }
424 }
425 }
426
427 add:
428 f_pos += nfidlen;
429
430 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
431 sb->s_blocksize - fibh->eoffset < nfidlen) {
432 brelse(epos.bh);
433 epos.bh = NULL;
434 fibh->soffset -= udf_ext0_offset(dir);
435 fibh->eoffset -= udf_ext0_offset(dir);
436 f_pos -= udf_ext0_offset(dir);
437 if (fibh->sbh != fibh->ebh)
438 brelse(fibh->ebh);
439 brelse(fibh->sbh);
440 fibh->sbh = fibh->ebh =
441 udf_expand_dir_adinicb(dir, &block, err);
442 if (!fibh->sbh)
443 goto out_err;
444 epos.block = dinfo->i_location;
445 epos.offset = udf_file_entry_alloc_offset(dir);
446 /* Load extent udf_expand_dir_adinicb() has created */
447 udf_current_aext(dir, &epos, &eloc, &elen, 1);
448 }
449
450 /* Entry fits into current block? */
451 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
452 fibh->soffset = fibh->eoffset;
453 fibh->eoffset += nfidlen;
454 if (fibh->sbh != fibh->ebh) {
455 brelse(fibh->sbh);
456 fibh->sbh = fibh->ebh;
457 }
458
459 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
460 block = dinfo->i_location.logicalBlockNum;
461 fi = (struct fileIdentDesc *)
462 (dinfo->i_data + fibh->soffset -
463 udf_ext0_offset(dir) +
464 dinfo->i_lenEAttr);
465 } else {
466 block = eloc.logicalBlockNum +
467 ((elen - 1) >>
468 dir->i_sb->s_blocksize_bits);
469 fi = (struct fileIdentDesc *)
470 (fibh->sbh->b_data + fibh->soffset);
471 }
472 } else {
473 /* Round up last extent in the file */
474 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
475 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
476 epos.offset -= sizeof(struct short_ad);
477 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
478 epos.offset -= sizeof(struct long_ad);
479 udf_write_aext(dir, &epos, &eloc, elen, 1);
480 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
481 - 1) & ~(sb->s_blocksize - 1);
482
483 fibh->soffset = fibh->eoffset - sb->s_blocksize;
484 fibh->eoffset += nfidlen - sb->s_blocksize;
485 if (fibh->sbh != fibh->ebh) {
486 brelse(fibh->sbh);
487 fibh->sbh = fibh->ebh;
488 }
489
490 block = eloc.logicalBlockNum + ((elen - 1) >>
491 dir->i_sb->s_blocksize_bits);
492 fibh->ebh = udf_bread(dir,
493 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
494 if (!fibh->ebh)
495 goto out_err;
496 /* Extents could have been merged, invalidate our position */
497 brelse(epos.bh);
498 epos.bh = NULL;
499 epos.block = dinfo->i_location;
500 epos.offset = udf_file_entry_alloc_offset(dir);
501
502 if (!fibh->soffset) {
503 /* Find the freshly allocated block */
504 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
505 (EXT_RECORDED_ALLOCATED >> 30))
506 ;
507 block = eloc.logicalBlockNum + ((elen - 1) >>
508 dir->i_sb->s_blocksize_bits);
509 brelse(fibh->sbh);
510 fibh->sbh = fibh->ebh;
511 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
512 } else {
513 fi = (struct fileIdentDesc *)
514 (fibh->sbh->b_data + sb->s_blocksize +
515 fibh->soffset);
516 }
517 }
518
519 memset(cfi, 0, sizeof(struct fileIdentDesc));
520 if (UDF_SB(sb)->s_udfrev >= 0x0200)
521 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
522 sizeof(struct tag));
523 else
524 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
525 sizeof(struct tag));
526 cfi->fileVersionNum = cpu_to_le16(1);
527 cfi->lengthFileIdent = namelen;
528 cfi->lengthOfImpUse = cpu_to_le16(0);
529 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
530 dir->i_size += nfidlen;
531 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
532 dinfo->i_lenAlloc += nfidlen;
533 else {
534 /* Find the last extent and truncate it to proper size */
535 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
536 (EXT_RECORDED_ALLOCATED >> 30))
537 ;
538 elen -= dinfo->i_lenExtents - dir->i_size;
539 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
540 epos.offset -= sizeof(struct short_ad);
541 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
542 epos.offset -= sizeof(struct long_ad);
543 udf_write_aext(dir, &epos, &eloc, elen, 1);
544 dinfo->i_lenExtents = dir->i_size;
545 }
546
547 mark_inode_dirty(dir);
548 goto out_ok;
549 } else {
550 *err = -EIO;
551 goto out_err;
552 }
553
554 out_err:
555 fi = NULL;
556 if (fibh->sbh != fibh->ebh)
557 brelse(fibh->ebh);
558 brelse(fibh->sbh);
559 out_ok:
560 brelse(epos.bh);
561 kfree(name);
562 return fi;
563 }
564
565 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
566 struct udf_fileident_bh *fibh,
567 struct fileIdentDesc *cfi)
568 {
569 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
570
571 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
572 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
573
574 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
575 }
576
577 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
578 {
579 struct udf_inode_info *iinfo = UDF_I(inode);
580 struct inode *dir = d_inode(dentry->d_parent);
581 struct udf_fileident_bh fibh;
582 struct fileIdentDesc cfi, *fi;
583 int err;
584
585 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
586 if (unlikely(!fi)) {
587 inode_dec_link_count(inode);
588 discard_new_inode(inode);
589 return err;
590 }
591 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
592 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
593 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
594 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
595 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
596 dir->i_ctime = dir->i_mtime = current_time(dir);
597 mark_inode_dirty(dir);
598 if (fibh.sbh != fibh.ebh)
599 brelse(fibh.ebh);
600 brelse(fibh.sbh);
601 d_instantiate_new(dentry, inode);
602
603 return 0;
604 }
605
606 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir,
607 struct dentry *dentry, umode_t mode, bool excl)
608 {
609 struct inode *inode = udf_new_inode(dir, mode);
610
611 if (IS_ERR(inode))
612 return PTR_ERR(inode);
613
614 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
615 inode->i_data.a_ops = &udf_adinicb_aops;
616 else
617 inode->i_data.a_ops = &udf_aops;
618 inode->i_op = &udf_file_inode_operations;
619 inode->i_fop = &udf_file_operations;
620 mark_inode_dirty(inode);
621
622 return udf_add_nondir(dentry, inode);
623 }
624
625 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
626 struct dentry *dentry, umode_t mode)
627 {
628 struct inode *inode = udf_new_inode(dir, mode);
629
630 if (IS_ERR(inode))
631 return PTR_ERR(inode);
632
633 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
634 inode->i_data.a_ops = &udf_adinicb_aops;
635 else
636 inode->i_data.a_ops = &udf_aops;
637 inode->i_op = &udf_file_inode_operations;
638 inode->i_fop = &udf_file_operations;
639 mark_inode_dirty(inode);
640 d_tmpfile(dentry, inode);
641 unlock_new_inode(inode);
642 return 0;
643 }
644
645 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir,
646 struct dentry *dentry, umode_t mode, dev_t rdev)
647 {
648 struct inode *inode;
649
650 if (!old_valid_dev(rdev))
651 return -EINVAL;
652
653 inode = udf_new_inode(dir, mode);
654 if (IS_ERR(inode))
655 return PTR_ERR(inode);
656
657 init_special_inode(inode, mode, rdev);
658 return udf_add_nondir(dentry, inode);
659 }
660
661 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
662 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 user_namespace *mnt_userns, struct inode *dir,
882 struct dentry *dentry, 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 if (unlikely(!epos.bh)) {
937 err = -ENOMEM;
938 goto out_no_entry;
939 }
940 lock_buffer(epos.bh);
941 memset(epos.bh->b_data, 0x00, bsize);
942 set_buffer_uptodate(epos.bh);
943 unlock_buffer(epos.bh);
944 mark_buffer_dirty_inode(epos.bh, inode);
945 ea = epos.bh->b_data + udf_ext0_offset(inode);
946 } else
947 ea = iinfo->i_data + iinfo->i_lenEAttr;
948
949 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
950 pc = (struct pathComponent *)ea;
951
952 if (*symname == '/') {
953 do {
954 symname++;
955 } while (*symname == '/');
956
957 pc->componentType = 1;
958 pc->lengthComponentIdent = 0;
959 pc->componentFileVersionNum = 0;
960 elen += sizeof(struct pathComponent);
961 }
962
963 err = -ENAMETOOLONG;
964
965 while (*symname) {
966 if (elen + sizeof(struct pathComponent) > eoffset)
967 goto out_no_entry;
968
969 pc = (struct pathComponent *)(ea + elen);
970
971 compstart = symname;
972
973 do {
974 symname++;
975 } while (*symname && *symname != '/');
976
977 pc->componentType = 5;
978 pc->lengthComponentIdent = 0;
979 pc->componentFileVersionNum = 0;
980 if (compstart[0] == '.') {
981 if ((symname - compstart) == 1)
982 pc->componentType = 4;
983 else if ((symname - compstart) == 2 &&
984 compstart[1] == '.')
985 pc->componentType = 3;
986 }
987
988 if (pc->componentType == 5) {
989 namelen = udf_put_filename(sb, compstart,
990 symname - compstart,
991 name, UDF_NAME_LEN_CS0);
992 if (!namelen)
993 goto out_no_entry;
994
995 if (elen + sizeof(struct pathComponent) + namelen >
996 eoffset)
997 goto out_no_entry;
998 else
999 pc->lengthComponentIdent = namelen;
1000
1001 memcpy(pc->componentIdent, name, namelen);
1002 }
1003
1004 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1005
1006 if (*symname) {
1007 do {
1008 symname++;
1009 } while (*symname == '/');
1010 }
1011 }
1012
1013 brelse(epos.bh);
1014 inode->i_size = elen;
1015 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1016 iinfo->i_lenAlloc = inode->i_size;
1017 else
1018 udf_truncate_tail_extent(inode);
1019 mark_inode_dirty(inode);
1020 up_write(&iinfo->i_data_sem);
1021
1022 err = udf_add_nondir(dentry, inode);
1023 out:
1024 kfree(name);
1025 return err;
1026
1027 out_no_entry:
1028 up_write(&iinfo->i_data_sem);
1029 inode_dec_link_count(inode);
1030 discard_new_inode(inode);
1031 goto out;
1032 }
1033
1034 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1035 struct dentry *dentry)
1036 {
1037 struct inode *inode = d_inode(old_dentry);
1038 struct udf_fileident_bh fibh;
1039 struct fileIdentDesc cfi, *fi;
1040 int err;
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_time(inode);
1061 mark_inode_dirty(inode);
1062 dir->i_ctime = dir->i_mtime = current_time(dir);
1063 mark_inode_dirty(dir);
1064 ihold(inode);
1065 d_instantiate(dentry, inode);
1066
1067 return 0;
1068 }
1069
1070 /* Anybody can rename anything with this: the permission checks are left to the
1071 * higher-level routines.
1072 */
1073 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1074 struct dentry *old_dentry, struct inode *new_dir,
1075 struct dentry *new_dentry, unsigned int flags)
1076 {
1077 struct inode *old_inode = d_inode(old_dentry);
1078 struct inode *new_inode = d_inode(new_dentry);
1079 struct udf_fileident_bh ofibh, nfibh;
1080 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1081 struct fileIdentDesc ocfi, ncfi;
1082 struct buffer_head *dir_bh = NULL;
1083 int retval = -ENOENT;
1084 struct kernel_lb_addr tloc;
1085 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1086
1087 if (flags & ~RENAME_NOREPLACE)
1088 return -EINVAL;
1089
1090 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1091 if (IS_ERR(ofi)) {
1092 retval = PTR_ERR(ofi);
1093 goto end_rename;
1094 }
1095
1096 if (ofibh.sbh != ofibh.ebh)
1097 brelse(ofibh.ebh);
1098
1099 brelse(ofibh.sbh);
1100 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1101 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1102 != old_inode->i_ino)
1103 goto end_rename;
1104
1105 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1106 if (IS_ERR(nfi)) {
1107 retval = PTR_ERR(nfi);
1108 goto end_rename;
1109 }
1110 if (nfi && !new_inode) {
1111 if (nfibh.sbh != nfibh.ebh)
1112 brelse(nfibh.ebh);
1113 brelse(nfibh.sbh);
1114 nfi = NULL;
1115 }
1116 if (S_ISDIR(old_inode->i_mode)) {
1117 int offset = udf_ext0_offset(old_inode);
1118
1119 if (new_inode) {
1120 retval = -ENOTEMPTY;
1121 if (!empty_dir(new_inode))
1122 goto end_rename;
1123 }
1124 retval = -EIO;
1125 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1126 dir_fi = udf_get_fileident(
1127 old_iinfo->i_data -
1128 (old_iinfo->i_efe ?
1129 sizeof(struct extendedFileEntry) :
1130 sizeof(struct fileEntry)),
1131 old_inode->i_sb->s_blocksize, &offset);
1132 } else {
1133 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1134 if (!dir_bh)
1135 goto end_rename;
1136 dir_fi = udf_get_fileident(dir_bh->b_data,
1137 old_inode->i_sb->s_blocksize, &offset);
1138 }
1139 if (!dir_fi)
1140 goto end_rename;
1141 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1142 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1143 old_dir->i_ino)
1144 goto end_rename;
1145 }
1146 if (!nfi) {
1147 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1148 &retval);
1149 if (!nfi)
1150 goto end_rename;
1151 }
1152
1153 /*
1154 * Like most other Unix systems, set the ctime for inodes on a
1155 * rename.
1156 */
1157 old_inode->i_ctime = current_time(old_inode);
1158 mark_inode_dirty(old_inode);
1159
1160 /*
1161 * ok, that's it
1162 */
1163 ncfi.fileVersionNum = ocfi.fileVersionNum;
1164 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1165 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1166 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1167
1168 /* The old fid may have moved - find it again */
1169 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1170 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1171
1172 if (new_inode) {
1173 new_inode->i_ctime = current_time(new_inode);
1174 inode_dec_link_count(new_inode);
1175 }
1176 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1177 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1178 mark_inode_dirty(old_dir);
1179 mark_inode_dirty(new_dir);
1180
1181 if (dir_fi) {
1182 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1183 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1184 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1185 mark_inode_dirty(old_inode);
1186 else
1187 mark_buffer_dirty_inode(dir_bh, old_inode);
1188
1189 inode_dec_link_count(old_dir);
1190 if (new_inode)
1191 inode_dec_link_count(new_inode);
1192 else {
1193 inc_nlink(new_dir);
1194 mark_inode_dirty(new_dir);
1195 }
1196 }
1197
1198 if (ofi) {
1199 if (ofibh.sbh != ofibh.ebh)
1200 brelse(ofibh.ebh);
1201 brelse(ofibh.sbh);
1202 }
1203
1204 retval = 0;
1205
1206 end_rename:
1207 brelse(dir_bh);
1208 if (nfi) {
1209 if (nfibh.sbh != nfibh.ebh)
1210 brelse(nfibh.ebh);
1211 brelse(nfibh.sbh);
1212 }
1213
1214 return retval;
1215 }
1216
1217 static struct dentry *udf_get_parent(struct dentry *child)
1218 {
1219 struct kernel_lb_addr tloc;
1220 struct inode *inode = NULL;
1221 struct fileIdentDesc cfi;
1222 struct udf_fileident_bh fibh;
1223
1224 if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi))
1225 return ERR_PTR(-EACCES);
1226
1227 if (fibh.sbh != fibh.ebh)
1228 brelse(fibh.ebh);
1229 brelse(fibh.sbh);
1230
1231 tloc = lelb_to_cpu(cfi.icb.extLocation);
1232 inode = udf_iget(child->d_sb, &tloc);
1233 if (IS_ERR(inode))
1234 return ERR_CAST(inode);
1235
1236 return d_obtain_alias(inode);
1237 }
1238
1239
1240 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1241 u16 partref, __u32 generation)
1242 {
1243 struct inode *inode;
1244 struct kernel_lb_addr loc;
1245
1246 if (block == 0)
1247 return ERR_PTR(-ESTALE);
1248
1249 loc.logicalBlockNum = block;
1250 loc.partitionReferenceNum = partref;
1251 inode = udf_iget(sb, &loc);
1252
1253 if (IS_ERR(inode))
1254 return ERR_CAST(inode);
1255
1256 if (generation && inode->i_generation != generation) {
1257 iput(inode);
1258 return ERR_PTR(-ESTALE);
1259 }
1260 return d_obtain_alias(inode);
1261 }
1262
1263 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1264 struct fid *fid, int fh_len, int fh_type)
1265 {
1266 if (fh_len < 3 ||
1267 (fh_type != FILEID_UDF_WITH_PARENT &&
1268 fh_type != FILEID_UDF_WITHOUT_PARENT))
1269 return NULL;
1270
1271 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1272 fid->udf.generation);
1273 }
1274
1275 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1276 struct fid *fid, int fh_len, int fh_type)
1277 {
1278 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1279 return NULL;
1280
1281 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1282 fid->udf.parent_partref,
1283 fid->udf.parent_generation);
1284 }
1285 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1286 struct inode *parent)
1287 {
1288 int len = *lenp;
1289 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1290 struct fid *fid = (struct fid *)fh;
1291 int type = FILEID_UDF_WITHOUT_PARENT;
1292
1293 if (parent && (len < 5)) {
1294 *lenp = 5;
1295 return FILEID_INVALID;
1296 } else if (len < 3) {
1297 *lenp = 3;
1298 return FILEID_INVALID;
1299 }
1300
1301 *lenp = 3;
1302 fid->udf.block = location.logicalBlockNum;
1303 fid->udf.partref = location.partitionReferenceNum;
1304 fid->udf.parent_partref = 0;
1305 fid->udf.generation = inode->i_generation;
1306
1307 if (parent) {
1308 location = UDF_I(parent)->i_location;
1309 fid->udf.parent_block = location.logicalBlockNum;
1310 fid->udf.parent_partref = location.partitionReferenceNum;
1311 fid->udf.parent_generation = inode->i_generation;
1312 *lenp = 5;
1313 type = FILEID_UDF_WITH_PARENT;
1314 }
1315
1316 return type;
1317 }
1318
1319 const struct export_operations udf_export_ops = {
1320 .encode_fh = udf_encode_fh,
1321 .fh_to_dentry = udf_fh_to_dentry,
1322 .fh_to_parent = udf_fh_to_parent,
1323 .get_parent = udf_get_parent,
1324 };
1325
1326 const struct inode_operations udf_dir_inode_operations = {
1327 .lookup = udf_lookup,
1328 .create = udf_create,
1329 .link = udf_link,
1330 .unlink = udf_unlink,
1331 .symlink = udf_symlink,
1332 .mkdir = udf_mkdir,
1333 .rmdir = udf_rmdir,
1334 .mknod = udf_mknod,
1335 .rename = udf_rename,
1336 .tmpfile = udf_tmpfile,
1337 };
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