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Linux 5.8-rc4
[linux/fpc-iii.git] / fs / udf / namei.c
blob77b6d89b9bcdd154c14768afd5aa458ece5f9234
1 /*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
15 *
16 * HISTORY
17 *
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
20 */
21
22 #include "udfdecl.h"
23
24 #include "udf_i.h"
25 #include "udf_sb.h"
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/sched.h>
31 #include <linux/crc-itu-t.h>
32 #include <linux/exportfs.h>
33
34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
35 const unsigned char *name2)
36 {
37 if (len1 != len2)
38 return 0;
39
40 return !memcmp(name1, name2, len1);
41 }
42
43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
45 uint8_t *impuse, uint8_t *fileident)
46 {
47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
48 uint16_t crc;
49 int offset;
50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
51 uint8_t lfi = cfi->lengthFileIdent;
52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
53 sizeof(struct fileIdentDesc);
54 int adinicb = 0;
55
56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
57 adinicb = 1;
58
59 offset = fibh->soffset + sizeof(struct fileIdentDesc);
60
61 if (impuse) {
62 if (adinicb || (offset + liu < 0)) {
63 memcpy((uint8_t *)sfi->impUse, impuse, liu);
64 } else if (offset >= 0) {
65 memcpy(fibh->ebh->b_data + offset, impuse, liu);
66 } else {
67 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
68 memcpy(fibh->ebh->b_data, impuse - offset,
69 liu + offset);
70 }
71 }
72
73 offset += liu;
74
75 if (fileident) {
76 if (adinicb || (offset + lfi < 0)) {
77 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
78 } else if (offset >= 0) {
79 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
80 } else {
81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
82 -offset);
83 memcpy(fibh->ebh->b_data, fileident - offset,
84 lfi + offset);
85 }
86 }
87
88 offset += lfi;
89
90 if (adinicb || (offset + padlen < 0)) {
91 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
92 } else if (offset >= 0) {
93 memset(fibh->ebh->b_data + offset, 0x00, padlen);
94 } else {
95 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
96 memset(fibh->ebh->b_data, 0x00, padlen + offset);
97 }
98
99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
100 sizeof(struct fileIdentDesc) - sizeof(struct tag));
101
102 if (fibh->sbh == fibh->ebh) {
103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
104 crclen + sizeof(struct tag) -
105 sizeof(struct fileIdentDesc));
106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
107 crc = crc_itu_t(crc, fibh->ebh->b_data +
108 sizeof(struct fileIdentDesc) +
109 fibh->soffset,
110 crclen + sizeof(struct tag) -
111 sizeof(struct fileIdentDesc));
112 } else {
113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
114 -fibh->soffset - sizeof(struct fileIdentDesc));
115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
116 }
117
118 cfi->descTag.descCRC = cpu_to_le16(crc);
119 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
121
122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
123 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
124 sizeof(struct fileIdentDesc));
125 } else {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
128 sizeof(struct fileIdentDesc) + fibh->soffset);
129 }
130
131 if (adinicb) {
132 mark_inode_dirty(inode);
133 } else {
134 if (fibh->sbh != fibh->ebh)
135 mark_buffer_dirty_inode(fibh->ebh, inode);
136 mark_buffer_dirty_inode(fibh->sbh, inode);
137 }
138 return 0;
139 }
140
141 /**
142 * udf_find_entry - find entry in given directory.
143 *
144 * @dir: directory inode to search in
145 * @child: qstr of the name
146 * @fibh: buffer head / inode with file identifier descriptor we found
147 * @cfi: found file identifier descriptor with given name
148 *
149 * This function searches in the directory @dir for a file name @child. When
150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
151 * directories) containing the file identifier descriptor (FID). In that case
152 * the function returns pointer to the FID in the buffer or inode - but note
153 * that FID may be split among two buffers (blocks) so accessing it via that
154 * pointer isn't easily possible. This pointer can be used only as an iterator
155 * for other directory manipulation functions. For inspection of the FID @cfi
156 * can be used - the found FID is copied there.
157 *
158 * Returns pointer to FID, NULL when nothing found, or error code.
159 */
160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
161 const struct qstr *child,
162 struct udf_fileident_bh *fibh,
163 struct fileIdentDesc *cfi)
164 {
165 struct fileIdentDesc *fi = NULL;
166 loff_t f_pos;
167 udf_pblk_t block;
168 int flen;
169 unsigned char *fname = NULL, *copy_name = NULL;
170 unsigned char *nameptr;
171 uint8_t lfi;
172 uint16_t liu;
173 loff_t size;
174 struct kernel_lb_addr eloc;
175 uint32_t elen;
176 sector_t offset;
177 struct extent_position epos = {};
178 struct udf_inode_info *dinfo = UDF_I(dir);
179 int isdotdot = child->len == 2 &&
180 child->name[0] == '.' && child->name[1] == '.';
181 struct super_block *sb = dir->i_sb;
182
183 size = udf_ext0_offset(dir) + dir->i_size;
184 f_pos = udf_ext0_offset(dir);
185
186 fibh->sbh = fibh->ebh = NULL;
187 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
188 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
189 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
190 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
191 fi = ERR_PTR(-EIO);
192 goto out_err;
193 }
194
195 block = udf_get_lb_pblock(sb, &eloc, offset);
196 if ((++offset << sb->s_blocksize_bits) < elen) {
197 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
198 epos.offset -= sizeof(struct short_ad);
199 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
200 epos.offset -= sizeof(struct long_ad);
201 } else
202 offset = 0;
203
204 fibh->sbh = fibh->ebh = udf_tread(sb, block);
205 if (!fibh->sbh) {
206 fi = ERR_PTR(-EIO);
207 goto out_err;
208 }
209 }
210
211 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
212 if (!fname) {
213 fi = ERR_PTR(-ENOMEM);
214 goto out_err;
215 }
216
217 while (f_pos < size) {
218 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
219 &elen, &offset);
220 if (!fi) {
221 fi = ERR_PTR(-EIO);
222 goto out_err;
223 }
224
225 liu = le16_to_cpu(cfi->lengthOfImpUse);
226 lfi = cfi->lengthFileIdent;
227
228 if (fibh->sbh == fibh->ebh) {
229 nameptr = fi->fileIdent + liu;
230 } else {
231 int poffset; /* Unpaded ending offset */
232
233 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
234 liu + lfi;
235
236 if (poffset >= lfi)
237 nameptr = (uint8_t *)(fibh->ebh->b_data +
238 poffset - lfi);
239 else {
240 if (!copy_name) {
241 copy_name = kmalloc(UDF_NAME_LEN,
242 GFP_NOFS);
243 if (!copy_name) {
244 fi = ERR_PTR(-ENOMEM);
245 goto out_err;
246 }
247 }
248 nameptr = copy_name;
249 memcpy(nameptr, fi->fileIdent + liu,
250 lfi - poffset);
251 memcpy(nameptr + lfi - poffset,
252 fibh->ebh->b_data, poffset);
253 }
254 }
255
256 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
257 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
258 continue;
259 }
260
261 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
262 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263 continue;
264 }
265
266 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
267 isdotdot)
268 goto out_ok;
269
270 if (!lfi)
271 continue;
272
273 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
274 if (flen < 0) {
275 fi = ERR_PTR(flen);
276 goto out_err;
277 }
278
279 if (udf_match(flen, fname, child->len, child->name))
280 goto out_ok;
281 }
282
283 fi = NULL;
284 out_err:
285 if (fibh->sbh != fibh->ebh)
286 brelse(fibh->ebh);
287 brelse(fibh->sbh);
288 out_ok:
289 brelse(epos.bh);
290 kfree(fname);
291 kfree(copy_name);
292
293 return fi;
294 }
295
296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
297 unsigned int flags)
298 {
299 struct inode *inode = NULL;
300 struct fileIdentDesc cfi;
301 struct udf_fileident_bh fibh;
302 struct fileIdentDesc *fi;
303
304 if (dentry->d_name.len > UDF_NAME_LEN)
305 return ERR_PTR(-ENAMETOOLONG);
306
307 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
308 if (IS_ERR(fi))
309 return ERR_CAST(fi);
310
311 if (fi) {
312 struct kernel_lb_addr loc;
313
314 if (fibh.sbh != fibh.ebh)
315 brelse(fibh.ebh);
316 brelse(fibh.sbh);
317
318 loc = lelb_to_cpu(cfi.icb.extLocation);
319 inode = udf_iget(dir->i_sb, &loc);
320 if (IS_ERR(inode))
321 return ERR_CAST(inode);
322 }
323
324 return d_splice_alias(inode, dentry);
325 }
326
327 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
328 struct dentry *dentry,
329 struct udf_fileident_bh *fibh,
330 struct fileIdentDesc *cfi, int *err)
331 {
332 struct super_block *sb = dir->i_sb;
333 struct fileIdentDesc *fi = NULL;
334 unsigned char *name = NULL;
335 int namelen;
336 loff_t f_pos;
337 loff_t size = udf_ext0_offset(dir) + dir->i_size;
338 int nfidlen;
339 udf_pblk_t block;
340 struct kernel_lb_addr eloc;
341 uint32_t elen = 0;
342 sector_t offset;
343 struct extent_position epos = {};
344 struct udf_inode_info *dinfo;
345
346 fibh->sbh = fibh->ebh = NULL;
347 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
348 if (!name) {
349 *err = -ENOMEM;
350 goto out_err;
351 }
352
353 if (dentry) {
354 if (!dentry->d_name.len) {
355 *err = -EINVAL;
356 goto out_err;
357 }
358 namelen = udf_put_filename(sb, dentry->d_name.name,
359 dentry->d_name.len,
360 name, UDF_NAME_LEN_CS0);
361 if (!namelen) {
362 *err = -ENAMETOOLONG;
363 goto out_err;
364 }
365 } else {
366 namelen = 0;
367 }
368
369 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
370
371 f_pos = udf_ext0_offset(dir);
372
373 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
374 dinfo = UDF_I(dir);
375 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
376 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
377 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
378 block = udf_get_lb_pblock(dir->i_sb,
379 &dinfo->i_location, 0);
380 fibh->soffset = fibh->eoffset = sb->s_blocksize;
381 goto add;
382 }
383 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
384 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
385 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
386 epos.offset -= sizeof(struct short_ad);
387 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
388 epos.offset -= sizeof(struct long_ad);
389 } else
390 offset = 0;
391
392 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
393 if (!fibh->sbh) {
394 *err = -EIO;
395 goto out_err;
396 }
397
398 block = dinfo->i_location.logicalBlockNum;
399 }
400
401 while (f_pos < size) {
402 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
403 &elen, &offset);
404
405 if (!fi) {
406 *err = -EIO;
407 goto out_err;
408 }
409
410 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
411 if (udf_dir_entry_len(cfi) == nfidlen) {
412 cfi->descTag.tagSerialNum = cpu_to_le16(1);
413 cfi->fileVersionNum = cpu_to_le16(1);
414 cfi->fileCharacteristics = 0;
415 cfi->lengthFileIdent = namelen;
416 cfi->lengthOfImpUse = cpu_to_le16(0);
417 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
418 name))
419 goto out_ok;
420 else {
421 *err = -EIO;
422 goto out_err;
423 }
424 }
425 }
426 }
427
428 add:
429 f_pos += nfidlen;
430
431 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
432 sb->s_blocksize - fibh->eoffset < nfidlen) {
433 brelse(epos.bh);
434 epos.bh = NULL;
435 fibh->soffset -= udf_ext0_offset(dir);
436 fibh->eoffset -= udf_ext0_offset(dir);
437 f_pos -= udf_ext0_offset(dir);
438 if (fibh->sbh != fibh->ebh)
439 brelse(fibh->ebh);
440 brelse(fibh->sbh);
441 fibh->sbh = fibh->ebh =
442 udf_expand_dir_adinicb(dir, &block, err);
443 if (!fibh->sbh)
444 goto out_err;
445 epos.block = dinfo->i_location;
446 epos.offset = udf_file_entry_alloc_offset(dir);
447 /* Load extent udf_expand_dir_adinicb() has created */
448 udf_current_aext(dir, &epos, &eloc, &elen, 1);
449 }
450
451 /* Entry fits into current block? */
452 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
453 fibh->soffset = fibh->eoffset;
454 fibh->eoffset += nfidlen;
455 if (fibh->sbh != fibh->ebh) {
456 brelse(fibh->sbh);
457 fibh->sbh = fibh->ebh;
458 }
459
460 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
461 block = dinfo->i_location.logicalBlockNum;
462 fi = (struct fileIdentDesc *)
463 (dinfo->i_ext.i_data +
464 fibh->soffset -
465 udf_ext0_offset(dir) +
466 dinfo->i_lenEAttr);
467 } else {
468 block = eloc.logicalBlockNum +
469 ((elen - 1) >>
470 dir->i_sb->s_blocksize_bits);
471 fi = (struct fileIdentDesc *)
472 (fibh->sbh->b_data + fibh->soffset);
473 }
474 } else {
475 /* Round up last extent in the file */
476 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
477 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
478 epos.offset -= sizeof(struct short_ad);
479 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
480 epos.offset -= sizeof(struct long_ad);
481 udf_write_aext(dir, &epos, &eloc, elen, 1);
482 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
483 - 1) & ~(sb->s_blocksize - 1);
484
485 fibh->soffset = fibh->eoffset - sb->s_blocksize;
486 fibh->eoffset += nfidlen - sb->s_blocksize;
487 if (fibh->sbh != fibh->ebh) {
488 brelse(fibh->sbh);
489 fibh->sbh = fibh->ebh;
490 }
491
492 block = eloc.logicalBlockNum + ((elen - 1) >>
493 dir->i_sb->s_blocksize_bits);
494 fibh->ebh = udf_bread(dir,
495 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
496 if (!fibh->ebh)
497 goto out_err;
498 /* Extents could have been merged, invalidate our position */
499 brelse(epos.bh);
500 epos.bh = NULL;
501 epos.block = dinfo->i_location;
502 epos.offset = udf_file_entry_alloc_offset(dir);
503
504 if (!fibh->soffset) {
505 /* Find the freshly allocated block */
506 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
507 (EXT_RECORDED_ALLOCATED >> 30))
508 ;
509 block = eloc.logicalBlockNum + ((elen - 1) >>
510 dir->i_sb->s_blocksize_bits);
511 brelse(fibh->sbh);
512 fibh->sbh = fibh->ebh;
513 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
514 } else {
515 fi = (struct fileIdentDesc *)
516 (fibh->sbh->b_data + sb->s_blocksize +
517 fibh->soffset);
518 }
519 }
520
521 memset(cfi, 0, sizeof(struct fileIdentDesc));
522 if (UDF_SB(sb)->s_udfrev >= 0x0200)
523 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
524 sizeof(struct tag));
525 else
526 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
527 sizeof(struct tag));
528 cfi->fileVersionNum = cpu_to_le16(1);
529 cfi->lengthFileIdent = namelen;
530 cfi->lengthOfImpUse = cpu_to_le16(0);
531 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
532 dir->i_size += nfidlen;
533 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
534 dinfo->i_lenAlloc += nfidlen;
535 else {
536 /* Find the last extent and truncate it to proper size */
537 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
538 (EXT_RECORDED_ALLOCATED >> 30))
539 ;
540 elen -= dinfo->i_lenExtents - dir->i_size;
541 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
542 epos.offset -= sizeof(struct short_ad);
543 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
544 epos.offset -= sizeof(struct long_ad);
545 udf_write_aext(dir, &epos, &eloc, elen, 1);
546 dinfo->i_lenExtents = dir->i_size;
547 }
548
549 mark_inode_dirty(dir);
550 goto out_ok;
551 } else {
552 *err = -EIO;
553 goto out_err;
554 }
555
556 out_err:
557 fi = NULL;
558 if (fibh->sbh != fibh->ebh)
559 brelse(fibh->ebh);
560 brelse(fibh->sbh);
561 out_ok:
562 brelse(epos.bh);
563 kfree(name);
564 return fi;
565 }
566
567 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
568 struct udf_fileident_bh *fibh,
569 struct fileIdentDesc *cfi)
570 {
571 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
572
573 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
574 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
575
576 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
577 }
578
579 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
580 {
581 struct udf_inode_info *iinfo = UDF_I(inode);
582 struct inode *dir = d_inode(dentry->d_parent);
583 struct udf_fileident_bh fibh;
584 struct fileIdentDesc cfi, *fi;
585 int err;
586
587 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
588 if (unlikely(!fi)) {
589 inode_dec_link_count(inode);
590 discard_new_inode(inode);
591 return err;
592 }
593 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
594 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
595 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
596 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
597 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
598 dir->i_ctime = dir->i_mtime = current_time(dir);
599 mark_inode_dirty(dir);
600 if (fibh.sbh != fibh.ebh)
601 brelse(fibh.ebh);
602 brelse(fibh.sbh);
603 d_instantiate_new(dentry, inode);
604
605 return 0;
606 }
607
608 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
609 bool excl)
610 {
611 struct inode *inode = udf_new_inode(dir, mode);
612
613 if (IS_ERR(inode))
614 return PTR_ERR(inode);
615
616 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
617 inode->i_data.a_ops = &udf_adinicb_aops;
618 else
619 inode->i_data.a_ops = &udf_aops;
620 inode->i_op = &udf_file_inode_operations;
621 inode->i_fop = &udf_file_operations;
622 mark_inode_dirty(inode);
623
624 return udf_add_nondir(dentry, inode);
625 }
626
627 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
628 {
629 struct inode *inode = udf_new_inode(dir, mode);
630
631 if (IS_ERR(inode))
632 return PTR_ERR(inode);
633
634 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
635 inode->i_data.a_ops = &udf_adinicb_aops;
636 else
637 inode->i_data.a_ops = &udf_aops;
638 inode->i_op = &udf_file_inode_operations;
639 inode->i_fop = &udf_file_operations;
640 mark_inode_dirty(inode);
641 d_tmpfile(dentry, inode);
642 unlock_new_inode(inode);
643 return 0;
644 }
645
646 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
647 dev_t rdev)
648 {
649 struct inode *inode;
650
651 if (!old_valid_dev(rdev))
652 return -EINVAL;
653
654 inode = udf_new_inode(dir, mode);
655 if (IS_ERR(inode))
656 return PTR_ERR(inode);
657
658 init_special_inode(inode, mode, rdev);
659 return udf_add_nondir(dentry, inode);
660 }
661
662 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
663 {
664 struct inode *inode;
665 struct udf_fileident_bh fibh;
666 struct fileIdentDesc cfi, *fi;
667 int err;
668 struct udf_inode_info *dinfo = UDF_I(dir);
669 struct udf_inode_info *iinfo;
670
671 inode = udf_new_inode(dir, S_IFDIR | mode);
672 if (IS_ERR(inode))
673 return PTR_ERR(inode);
674
675 iinfo = UDF_I(inode);
676 inode->i_op = &udf_dir_inode_operations;
677 inode->i_fop = &udf_dir_operations;
678 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
679 if (!fi) {
680 inode_dec_link_count(inode);
681 discard_new_inode(inode);
682 goto out;
683 }
684 set_nlink(inode, 2);
685 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
686 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
687 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
688 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
689 cfi.fileCharacteristics =
690 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
691 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
692 brelse(fibh.sbh);
693 mark_inode_dirty(inode);
694
695 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
696 if (!fi) {
697 clear_nlink(inode);
698 mark_inode_dirty(inode);
699 discard_new_inode(inode);
700 goto out;
701 }
702 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
703 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
704 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
705 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
706 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
707 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
708 inc_nlink(dir);
709 dir->i_ctime = dir->i_mtime = current_time(dir);
710 mark_inode_dirty(dir);
711 d_instantiate_new(dentry, inode);
712 if (fibh.sbh != fibh.ebh)
713 brelse(fibh.ebh);
714 brelse(fibh.sbh);
715 err = 0;
716
717 out:
718 return err;
719 }
720
721 static int empty_dir(struct inode *dir)
722 {
723 struct fileIdentDesc *fi, cfi;
724 struct udf_fileident_bh fibh;
725 loff_t f_pos;
726 loff_t size = udf_ext0_offset(dir) + dir->i_size;
727 udf_pblk_t block;
728 struct kernel_lb_addr eloc;
729 uint32_t elen;
730 sector_t offset;
731 struct extent_position epos = {};
732 struct udf_inode_info *dinfo = UDF_I(dir);
733
734 f_pos = udf_ext0_offset(dir);
735 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
736
737 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
738 fibh.sbh = fibh.ebh = NULL;
739 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
740 &epos, &eloc, &elen, &offset) ==
741 (EXT_RECORDED_ALLOCATED >> 30)) {
742 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
743 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
744 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
745 epos.offset -= sizeof(struct short_ad);
746 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
747 epos.offset -= sizeof(struct long_ad);
748 } else
749 offset = 0;
750
751 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
752 if (!fibh.sbh) {
753 brelse(epos.bh);
754 return 0;
755 }
756 } else {
757 brelse(epos.bh);
758 return 0;
759 }
760
761 while (f_pos < size) {
762 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
763 &elen, &offset);
764 if (!fi) {
765 if (fibh.sbh != fibh.ebh)
766 brelse(fibh.ebh);
767 brelse(fibh.sbh);
768 brelse(epos.bh);
769 return 0;
770 }
771
772 if (cfi.lengthFileIdent &&
773 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
774 if (fibh.sbh != fibh.ebh)
775 brelse(fibh.ebh);
776 brelse(fibh.sbh);
777 brelse(epos.bh);
778 return 0;
779 }
780 }
781
782 if (fibh.sbh != fibh.ebh)
783 brelse(fibh.ebh);
784 brelse(fibh.sbh);
785 brelse(epos.bh);
786
787 return 1;
788 }
789
790 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
791 {
792 int retval;
793 struct inode *inode = d_inode(dentry);
794 struct udf_fileident_bh fibh;
795 struct fileIdentDesc *fi, cfi;
796 struct kernel_lb_addr tloc;
797
798 retval = -ENOENT;
799 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
800 if (IS_ERR_OR_NULL(fi)) {
801 if (fi)
802 retval = PTR_ERR(fi);
803 goto out;
804 }
805
806 retval = -EIO;
807 tloc = lelb_to_cpu(cfi.icb.extLocation);
808 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
809 goto end_rmdir;
810 retval = -ENOTEMPTY;
811 if (!empty_dir(inode))
812 goto end_rmdir;
813 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
814 if (retval)
815 goto end_rmdir;
816 if (inode->i_nlink != 2)
817 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
818 inode->i_nlink);
819 clear_nlink(inode);
820 inode->i_size = 0;
821 inode_dec_link_count(dir);
822 inode->i_ctime = dir->i_ctime = dir->i_mtime =
823 current_time(inode);
824 mark_inode_dirty(dir);
825
826 end_rmdir:
827 if (fibh.sbh != fibh.ebh)
828 brelse(fibh.ebh);
829 brelse(fibh.sbh);
830
831 out:
832 return retval;
833 }
834
835 static int udf_unlink(struct inode *dir, struct dentry *dentry)
836 {
837 int retval;
838 struct inode *inode = d_inode(dentry);
839 struct udf_fileident_bh fibh;
840 struct fileIdentDesc *fi;
841 struct fileIdentDesc cfi;
842 struct kernel_lb_addr tloc;
843
844 retval = -ENOENT;
845 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
846
847 if (IS_ERR_OR_NULL(fi)) {
848 if (fi)
849 retval = PTR_ERR(fi);
850 goto out;
851 }
852
853 retval = -EIO;
854 tloc = lelb_to_cpu(cfi.icb.extLocation);
855 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
856 goto end_unlink;
857
858 if (!inode->i_nlink) {
859 udf_debug("Deleting nonexistent file (%lu), %u\n",
860 inode->i_ino, inode->i_nlink);
861 set_nlink(inode, 1);
862 }
863 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
864 if (retval)
865 goto end_unlink;
866 dir->i_ctime = dir->i_mtime = current_time(dir);
867 mark_inode_dirty(dir);
868 inode_dec_link_count(inode);
869 inode->i_ctime = dir->i_ctime;
870 retval = 0;
871
872 end_unlink:
873 if (fibh.sbh != fibh.ebh)
874 brelse(fibh.ebh);
875 brelse(fibh.sbh);
876
877 out:
878 return retval;
879 }
880
881 static int udf_symlink(struct inode *dir, struct dentry *dentry,
882 const char *symname)
883 {
884 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
885 struct pathComponent *pc;
886 const char *compstart;
887 struct extent_position epos = {};
888 int eoffset, elen = 0;
889 uint8_t *ea;
890 int err;
891 udf_pblk_t block;
892 unsigned char *name = NULL;
893 int namelen;
894 struct udf_inode_info *iinfo;
895 struct super_block *sb = dir->i_sb;
896
897 if (IS_ERR(inode))
898 return PTR_ERR(inode);
899
900 iinfo = UDF_I(inode);
901 down_write(&iinfo->i_data_sem);
902 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
903 if (!name) {
904 err = -ENOMEM;
905 goto out_no_entry;
906 }
907
908 inode->i_data.a_ops = &udf_symlink_aops;
909 inode->i_op = &udf_symlink_inode_operations;
910 inode_nohighmem(inode);
911
912 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
913 struct kernel_lb_addr eloc;
914 uint32_t bsize;
915
916 block = udf_new_block(sb, inode,
917 iinfo->i_location.partitionReferenceNum,
918 iinfo->i_location.logicalBlockNum, &err);
919 if (!block)
920 goto out_no_entry;
921 epos.block = iinfo->i_location;
922 epos.offset = udf_file_entry_alloc_offset(inode);
923 epos.bh = NULL;
924 eloc.logicalBlockNum = block;
925 eloc.partitionReferenceNum =
926 iinfo->i_location.partitionReferenceNum;
927 bsize = sb->s_blocksize;
928 iinfo->i_lenExtents = bsize;
929 udf_add_aext(inode, &epos, &eloc, bsize, 0);
930 brelse(epos.bh);
931
932 block = udf_get_pblock(sb, block,
933 iinfo->i_location.partitionReferenceNum,
934 0);
935 epos.bh = udf_tgetblk(sb, block);
936 lock_buffer(epos.bh);
937 memset(epos.bh->b_data, 0x00, bsize);
938 set_buffer_uptodate(epos.bh);
939 unlock_buffer(epos.bh);
940 mark_buffer_dirty_inode(epos.bh, inode);
941 ea = epos.bh->b_data + udf_ext0_offset(inode);
942 } else
943 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
944
945 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
946 pc = (struct pathComponent *)ea;
947
948 if (*symname == '/') {
949 do {
950 symname++;
951 } while (*symname == '/');
952
953 pc->componentType = 1;
954 pc->lengthComponentIdent = 0;
955 pc->componentFileVersionNum = 0;
956 elen += sizeof(struct pathComponent);
957 }
958
959 err = -ENAMETOOLONG;
960
961 while (*symname) {
962 if (elen + sizeof(struct pathComponent) > eoffset)
963 goto out_no_entry;
964
965 pc = (struct pathComponent *)(ea + elen);
966
967 compstart = symname;
968
969 do {
970 symname++;
971 } while (*symname && *symname != '/');
972
973 pc->componentType = 5;
974 pc->lengthComponentIdent = 0;
975 pc->componentFileVersionNum = 0;
976 if (compstart[0] == '.') {
977 if ((symname - compstart) == 1)
978 pc->componentType = 4;
979 else if ((symname - compstart) == 2 &&
980 compstart[1] == '.')
981 pc->componentType = 3;
982 }
983
984 if (pc->componentType == 5) {
985 namelen = udf_put_filename(sb, compstart,
986 symname - compstart,
987 name, UDF_NAME_LEN_CS0);
988 if (!namelen)
989 goto out_no_entry;
990
991 if (elen + sizeof(struct pathComponent) + namelen >
992 eoffset)
993 goto out_no_entry;
994 else
995 pc->lengthComponentIdent = namelen;
996
997 memcpy(pc->componentIdent, name, namelen);
998 }
999
1000 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1001
1002 if (*symname) {
1003 do {
1004 symname++;
1005 } while (*symname == '/');
1006 }
1007 }
1008
1009 brelse(epos.bh);
1010 inode->i_size = elen;
1011 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1012 iinfo->i_lenAlloc = inode->i_size;
1013 else
1014 udf_truncate_tail_extent(inode);
1015 mark_inode_dirty(inode);
1016 up_write(&iinfo->i_data_sem);
1017
1018 err = udf_add_nondir(dentry, inode);
1019 out:
1020 kfree(name);
1021 return err;
1022
1023 out_no_entry:
1024 up_write(&iinfo->i_data_sem);
1025 inode_dec_link_count(inode);
1026 discard_new_inode(inode);
1027 goto out;
1028 }
1029
1030 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1031 struct dentry *dentry)
1032 {
1033 struct inode *inode = d_inode(old_dentry);
1034 struct udf_fileident_bh fibh;
1035 struct fileIdentDesc cfi, *fi;
1036 int err;
1037
1038 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1039 if (!fi) {
1040 return err;
1041 }
1042 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1043 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1044 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1045 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1046 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1047 }
1048 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1049 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1050 mark_inode_dirty(dir);
1051
1052 if (fibh.sbh != fibh.ebh)
1053 brelse(fibh.ebh);
1054 brelse(fibh.sbh);
1055 inc_nlink(inode);
1056 inode->i_ctime = current_time(inode);
1057 mark_inode_dirty(inode);
1058 dir->i_ctime = dir->i_mtime = current_time(dir);
1059 mark_inode_dirty(dir);
1060 ihold(inode);
1061 d_instantiate(dentry, inode);
1062
1063 return 0;
1064 }
1065
1066 /* Anybody can rename anything with this: the permission checks are left to the
1067 * higher-level routines.
1068 */
1069 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1070 struct inode *new_dir, struct dentry *new_dentry,
1071 unsigned int flags)
1072 {
1073 struct inode *old_inode = d_inode(old_dentry);
1074 struct inode *new_inode = d_inode(new_dentry);
1075 struct udf_fileident_bh ofibh, nfibh;
1076 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1077 struct fileIdentDesc ocfi, ncfi;
1078 struct buffer_head *dir_bh = NULL;
1079 int retval = -ENOENT;
1080 struct kernel_lb_addr tloc;
1081 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1082
1083 if (flags & ~RENAME_NOREPLACE)
1084 return -EINVAL;
1085
1086 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1087 if (IS_ERR(ofi)) {
1088 retval = PTR_ERR(ofi);
1089 goto end_rename;
1090 }
1091
1092 if (ofibh.sbh != ofibh.ebh)
1093 brelse(ofibh.ebh);
1094
1095 brelse(ofibh.sbh);
1096 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1097 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1098 != old_inode->i_ino)
1099 goto end_rename;
1100
1101 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1102 if (IS_ERR(nfi)) {
1103 retval = PTR_ERR(nfi);
1104 goto end_rename;
1105 }
1106 if (nfi && !new_inode) {
1107 if (nfibh.sbh != nfibh.ebh)
1108 brelse(nfibh.ebh);
1109 brelse(nfibh.sbh);
1110 nfi = NULL;
1111 }
1112 if (S_ISDIR(old_inode->i_mode)) {
1113 int offset = udf_ext0_offset(old_inode);
1114
1115 if (new_inode) {
1116 retval = -ENOTEMPTY;
1117 if (!empty_dir(new_inode))
1118 goto end_rename;
1119 }
1120 retval = -EIO;
1121 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1122 dir_fi = udf_get_fileident(
1123 old_iinfo->i_ext.i_data -
1124 (old_iinfo->i_efe ?
1125 sizeof(struct extendedFileEntry) :
1126 sizeof(struct fileEntry)),
1127 old_inode->i_sb->s_blocksize, &offset);
1128 } else {
1129 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1130 if (!dir_bh)
1131 goto end_rename;
1132 dir_fi = udf_get_fileident(dir_bh->b_data,
1133 old_inode->i_sb->s_blocksize, &offset);
1134 }
1135 if (!dir_fi)
1136 goto end_rename;
1137 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1138 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1139 old_dir->i_ino)
1140 goto end_rename;
1141 }
1142 if (!nfi) {
1143 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1144 &retval);
1145 if (!nfi)
1146 goto end_rename;
1147 }
1148
1149 /*
1150 * Like most other Unix systems, set the ctime for inodes on a
1151 * rename.
1152 */
1153 old_inode->i_ctime = current_time(old_inode);
1154 mark_inode_dirty(old_inode);
1155
1156 /*
1157 * ok, that's it
1158 */
1159 ncfi.fileVersionNum = ocfi.fileVersionNum;
1160 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1161 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1162 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1163
1164 /* The old fid may have moved - find it again */
1165 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1166 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1167
1168 if (new_inode) {
1169 new_inode->i_ctime = current_time(new_inode);
1170 inode_dec_link_count(new_inode);
1171 }
1172 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1173 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1174 mark_inode_dirty(old_dir);
1175 mark_inode_dirty(new_dir);
1176
1177 if (dir_fi) {
1178 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1179 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1180 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1181 mark_inode_dirty(old_inode);
1182 else
1183 mark_buffer_dirty_inode(dir_bh, old_inode);
1184
1185 inode_dec_link_count(old_dir);
1186 if (new_inode)
1187 inode_dec_link_count(new_inode);
1188 else {
1189 inc_nlink(new_dir);
1190 mark_inode_dirty(new_dir);
1191 }
1192 }
1193
1194 if (ofi) {
1195 if (ofibh.sbh != ofibh.ebh)
1196 brelse(ofibh.ebh);
1197 brelse(ofibh.sbh);
1198 }
1199
1200 retval = 0;
1201
1202 end_rename:
1203 brelse(dir_bh);
1204 if (nfi) {
1205 if (nfibh.sbh != nfibh.ebh)
1206 brelse(nfibh.ebh);
1207 brelse(nfibh.sbh);
1208 }
1209
1210 return retval;
1211 }
1212
1213 static struct dentry *udf_get_parent(struct dentry *child)
1214 {
1215 struct kernel_lb_addr tloc;
1216 struct inode *inode = NULL;
1217 struct qstr dotdot = QSTR_INIT("..", 2);
1218 struct fileIdentDesc cfi;
1219 struct udf_fileident_bh fibh;
1220
1221 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1222 return ERR_PTR(-EACCES);
1223
1224 if (fibh.sbh != fibh.ebh)
1225 brelse(fibh.ebh);
1226 brelse(fibh.sbh);
1227
1228 tloc = lelb_to_cpu(cfi.icb.extLocation);
1229 inode = udf_iget(child->d_sb, &tloc);
1230 if (IS_ERR(inode))
1231 return ERR_CAST(inode);
1232
1233 return d_obtain_alias(inode);
1234 }
1235
1236
1237 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1238 u16 partref, __u32 generation)
1239 {
1240 struct inode *inode;
1241 struct kernel_lb_addr loc;
1242
1243 if (block == 0)
1244 return ERR_PTR(-ESTALE);
1245
1246 loc.logicalBlockNum = block;
1247 loc.partitionReferenceNum = partref;
1248 inode = udf_iget(sb, &loc);
1249
1250 if (IS_ERR(inode))
1251 return ERR_CAST(inode);
1252
1253 if (generation && inode->i_generation != generation) {
1254 iput(inode);
1255 return ERR_PTR(-ESTALE);
1256 }
1257 return d_obtain_alias(inode);
1258 }
1259
1260 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1261 struct fid *fid, int fh_len, int fh_type)
1262 {
1263 if (fh_len < 3 ||
1264 (fh_type != FILEID_UDF_WITH_PARENT &&
1265 fh_type != FILEID_UDF_WITHOUT_PARENT))
1266 return NULL;
1267
1268 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1269 fid->udf.generation);
1270 }
1271
1272 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1273 struct fid *fid, int fh_len, int fh_type)
1274 {
1275 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1276 return NULL;
1277
1278 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1279 fid->udf.parent_partref,
1280 fid->udf.parent_generation);
1281 }
1282 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1283 struct inode *parent)
1284 {
1285 int len = *lenp;
1286 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1287 struct fid *fid = (struct fid *)fh;
1288 int type = FILEID_UDF_WITHOUT_PARENT;
1289
1290 if (parent && (len < 5)) {
1291 *lenp = 5;
1292 return FILEID_INVALID;
1293 } else if (len < 3) {
1294 *lenp = 3;
1295 return FILEID_INVALID;
1296 }
1297
1298 *lenp = 3;
1299 fid->udf.block = location.logicalBlockNum;
1300 fid->udf.partref = location.partitionReferenceNum;
1301 fid->udf.parent_partref = 0;
1302 fid->udf.generation = inode->i_generation;
1303
1304 if (parent) {
1305 location = UDF_I(parent)->i_location;
1306 fid->udf.parent_block = location.logicalBlockNum;
1307 fid->udf.parent_partref = location.partitionReferenceNum;
1308 fid->udf.parent_generation = inode->i_generation;
1309 *lenp = 5;
1310 type = FILEID_UDF_WITH_PARENT;
1311 }
1312
1313 return type;
1314 }
1315
1316 const struct export_operations udf_export_ops = {
1317 .encode_fh = udf_encode_fh,
1318 .fh_to_dentry = udf_fh_to_dentry,
1319 .fh_to_parent = udf_fh_to_parent,
1320 .get_parent = udf_get_parent,
1321 };
1322
1323 const struct inode_operations udf_dir_inode_operations = {
1324 .lookup = udf_lookup,
1325 .create = udf_create,
1326 .link = udf_link,
1327 .unlink = udf_unlink,
1328 .symlink = udf_symlink,
1329 .mkdir = udf_mkdir,
1330 .rmdir = udf_rmdir,
1331 .mknod = udf_mknod,
1332 .rename = udf_rename,
1333 .tmpfile = udf_tmpfile,
1334 };
Linux with added FPC-III support