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filesystems: add missing nlink wrappers
[deliverable/linux.git] / fs / udf / namei.c
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_dec_link_count(inode);
581 iput(inode);
582 return err;
583 }
584 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
585 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
586 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
587 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
588 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
589 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
590 mark_inode_dirty(dir);
591 if (fibh.sbh != fibh.ebh)
592 brelse(fibh.ebh);
593 brelse(fibh.sbh);
594 d_instantiate(dentry, inode);
595
596 return 0;
597 }
598
599 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
600 dev_t rdev)
601 {
602 struct inode *inode;
603 struct udf_fileident_bh fibh;
604 struct fileIdentDesc cfi, *fi;
605 int err;
606 struct udf_inode_info *iinfo;
607
608 if (!old_valid_dev(rdev))
609 return -EINVAL;
610
611 err = -EIO;
612 inode = udf_new_inode(dir, mode, &err);
613 if (!inode)
614 goto out;
615
616 iinfo = UDF_I(inode);
617 init_special_inode(inode, mode, rdev);
618 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
619 if (!fi) {
620 inode_dec_link_count(inode);
621 iput(inode);
622 return err;
623 }
624 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
625 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
626 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
627 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
628 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
629 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
630 mark_inode_dirty(dir);
631 mark_inode_dirty(inode);
632
633 if (fibh.sbh != fibh.ebh)
634 brelse(fibh.ebh);
635 brelse(fibh.sbh);
636 d_instantiate(dentry, inode);
637 err = 0;
638
639 out:
640 return err;
641 }
642
643 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
644 {
645 struct inode *inode;
646 struct udf_fileident_bh fibh;
647 struct fileIdentDesc cfi, *fi;
648 int err;
649 struct udf_inode_info *dinfo = UDF_I(dir);
650 struct udf_inode_info *iinfo;
651
652 err = -EMLINK;
653 if (dir->i_nlink >= UDF_MAX_LINKS)
654 goto out;
655
656 err = -EIO;
657 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
658 if (!inode)
659 goto out;
660
661 iinfo = UDF_I(inode);
662 inode->i_op = &udf_dir_inode_operations;
663 inode->i_fop = &udf_dir_operations;
664 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
665 if (!fi) {
666 inode_dec_link_count(inode);
667 iput(inode);
668 goto out;
669 }
670 inode->i_nlink = 2;
671 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
672 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
673 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
674 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
675 cfi.fileCharacteristics =
676 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
677 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
678 brelse(fibh.sbh);
679 mark_inode_dirty(inode);
680
681 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
682 if (!fi) {
683 clear_nlink(inode);
684 mark_inode_dirty(inode);
685 iput(inode);
686 goto out;
687 }
688 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
689 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
690 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
691 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
692 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
693 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
694 inc_nlink(dir);
695 mark_inode_dirty(dir);
696 d_instantiate(dentry, inode);
697 if (fibh.sbh != fibh.ebh)
698 brelse(fibh.ebh);
699 brelse(fibh.sbh);
700 err = 0;
701
702 out:
703 return err;
704 }
705
706 static int empty_dir(struct inode *dir)
707 {
708 struct fileIdentDesc *fi, cfi;
709 struct udf_fileident_bh fibh;
710 loff_t f_pos;
711 loff_t size = udf_ext0_offset(dir) + dir->i_size;
712 int block;
713 struct kernel_lb_addr eloc;
714 uint32_t elen;
715 sector_t offset;
716 struct extent_position epos = {};
717 struct udf_inode_info *dinfo = UDF_I(dir);
718
719 f_pos = udf_ext0_offset(dir);
720 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
721
722 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
723 fibh.sbh = fibh.ebh = NULL;
724 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
725 &epos, &eloc, &elen, &offset) ==
726 (EXT_RECORDED_ALLOCATED >> 30)) {
727 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
728 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
729 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
730 epos.offset -= sizeof(struct short_ad);
731 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
732 epos.offset -= sizeof(struct long_ad);
733 } else
734 offset = 0;
735
736 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
737 if (!fibh.sbh) {
738 brelse(epos.bh);
739 return 0;
740 }
741 } else {
742 brelse(epos.bh);
743 return 0;
744 }
745
746 while (f_pos < size) {
747 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
748 &elen, &offset);
749 if (!fi) {
750 if (fibh.sbh != fibh.ebh)
751 brelse(fibh.ebh);
752 brelse(fibh.sbh);
753 brelse(epos.bh);
754 return 0;
755 }
756
757 if (cfi.lengthFileIdent &&
758 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
759 if (fibh.sbh != fibh.ebh)
760 brelse(fibh.ebh);
761 brelse(fibh.sbh);
762 brelse(epos.bh);
763 return 0;
764 }
765 }
766
767 if (fibh.sbh != fibh.ebh)
768 brelse(fibh.ebh);
769 brelse(fibh.sbh);
770 brelse(epos.bh);
771
772 return 1;
773 }
774
775 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
776 {
777 int retval;
778 struct inode *inode = dentry->d_inode;
779 struct udf_fileident_bh fibh;
780 struct fileIdentDesc *fi, cfi;
781 struct kernel_lb_addr tloc;
782
783 retval = -ENOENT;
784 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
785 if (!fi)
786 goto out;
787
788 retval = -EIO;
789 tloc = lelb_to_cpu(cfi.icb.extLocation);
790 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
791 goto end_rmdir;
792 retval = -ENOTEMPTY;
793 if (!empty_dir(inode))
794 goto end_rmdir;
795 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
796 if (retval)
797 goto end_rmdir;
798 if (inode->i_nlink != 2)
799 udf_warning(inode->i_sb, "udf_rmdir",
800 "empty directory has nlink != 2 (%d)",
801 inode->i_nlink);
802 clear_nlink(inode);
803 inode->i_size = 0;
804 inode_dec_link_count(dir);
805 inode->i_ctime = dir->i_ctime = dir->i_mtime =
806 current_fs_time(dir->i_sb);
807 mark_inode_dirty(dir);
808
809 end_rmdir:
810 if (fibh.sbh != fibh.ebh)
811 brelse(fibh.ebh);
812 brelse(fibh.sbh);
813
814 out:
815 return retval;
816 }
817
818 static int udf_unlink(struct inode *dir, struct dentry *dentry)
819 {
820 int retval;
821 struct inode *inode = dentry->d_inode;
822 struct udf_fileident_bh fibh;
823 struct fileIdentDesc *fi;
824 struct fileIdentDesc cfi;
825 struct kernel_lb_addr tloc;
826
827 retval = -ENOENT;
828 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
829 if (!fi)
830 goto out;
831
832 retval = -EIO;
833 tloc = lelb_to_cpu(cfi.icb.extLocation);
834 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
835 goto end_unlink;
836
837 if (!inode->i_nlink) {
838 udf_debug("Deleting nonexistent file (%lu), %d\n",
839 inode->i_ino, inode->i_nlink);
840 inode->i_nlink = 1;
841 }
842 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
843 if (retval)
844 goto end_unlink;
845 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
846 mark_inode_dirty(dir);
847 inode_dec_link_count(inode);
848 inode->i_ctime = dir->i_ctime;
849 retval = 0;
850
851 end_unlink:
852 if (fibh.sbh != fibh.ebh)
853 brelse(fibh.ebh);
854 brelse(fibh.sbh);
855
856 out:
857 return retval;
858 }
859
860 static int udf_symlink(struct inode *dir, struct dentry *dentry,
861 const char *symname)
862 {
863 struct inode *inode;
864 struct pathComponent *pc;
865 const char *compstart;
866 struct udf_fileident_bh fibh;
867 struct extent_position epos = {};
868 int eoffset, elen = 0;
869 struct fileIdentDesc *fi;
870 struct fileIdentDesc cfi;
871 uint8_t *ea;
872 int err;
873 int block;
874 unsigned char *name = NULL;
875 int namelen;
876 struct udf_inode_info *iinfo;
877 struct super_block *sb = dir->i_sb;
878
879 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
880 if (!inode)
881 goto out;
882
883 iinfo = UDF_I(inode);
884 down_write(&iinfo->i_data_sem);
885 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
886 if (!name) {
887 err = -ENOMEM;
888 goto out_no_entry;
889 }
890
891 inode->i_data.a_ops = &udf_symlink_aops;
892 inode->i_op = &udf_symlink_inode_operations;
893
894 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
895 struct kernel_lb_addr eloc;
896 uint32_t bsize;
897
898 block = udf_new_block(sb, inode,
899 iinfo->i_location.partitionReferenceNum,
900 iinfo->i_location.logicalBlockNum, &err);
901 if (!block)
902 goto out_no_entry;
903 epos.block = iinfo->i_location;
904 epos.offset = udf_file_entry_alloc_offset(inode);
905 epos.bh = NULL;
906 eloc.logicalBlockNum = block;
907 eloc.partitionReferenceNum =
908 iinfo->i_location.partitionReferenceNum;
909 bsize = sb->s_blocksize;
910 iinfo->i_lenExtents = bsize;
911 udf_add_aext(inode, &epos, &eloc, bsize, 0);
912 brelse(epos.bh);
913
914 block = udf_get_pblock(sb, block,
915 iinfo->i_location.partitionReferenceNum,
916 0);
917 epos.bh = udf_tgetblk(sb, block);
918 lock_buffer(epos.bh);
919 memset(epos.bh->b_data, 0x00, bsize);
920 set_buffer_uptodate(epos.bh);
921 unlock_buffer(epos.bh);
922 mark_buffer_dirty_inode(epos.bh, inode);
923 ea = epos.bh->b_data + udf_ext0_offset(inode);
924 } else
925 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
926
927 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
928 pc = (struct pathComponent *)ea;
929
930 if (*symname == '/') {
931 do {
932 symname++;
933 } while (*symname == '/');
934
935 pc->componentType = 1;
936 pc->lengthComponentIdent = 0;
937 pc->componentFileVersionNum = 0;
938 elen += sizeof(struct pathComponent);
939 }
940
941 err = -ENAMETOOLONG;
942
943 while (*symname) {
944 if (elen + sizeof(struct pathComponent) > eoffset)
945 goto out_no_entry;
946
947 pc = (struct pathComponent *)(ea + elen);
948
949 compstart = symname;
950
951 do {
952 symname++;
953 } while (*symname && *symname != '/');
954
955 pc->componentType = 5;
956 pc->lengthComponentIdent = 0;
957 pc->componentFileVersionNum = 0;
958 if (compstart[0] == '.') {
959 if ((symname - compstart) == 1)
960 pc->componentType = 4;
961 else if ((symname - compstart) == 2 &&
962 compstart[1] == '.')
963 pc->componentType = 3;
964 }
965
966 if (pc->componentType == 5) {
967 namelen = udf_put_filename(sb, compstart, name,
968 symname - compstart);
969 if (!namelen)
970 goto out_no_entry;
971
972 if (elen + sizeof(struct pathComponent) + namelen >
973 eoffset)
974 goto out_no_entry;
975 else
976 pc->lengthComponentIdent = namelen;
977
978 memcpy(pc->componentIdent, name, namelen);
979 }
980
981 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
982
983 if (*symname) {
984 do {
985 symname++;
986 } while (*symname == '/');
987 }
988 }
989
990 brelse(epos.bh);
991 inode->i_size = elen;
992 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
993 iinfo->i_lenAlloc = inode->i_size;
994 else
995 udf_truncate_tail_extent(inode);
996 mark_inode_dirty(inode);
997
998 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
999 if (!fi)
1000 goto out_no_entry;
1001 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1002 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1003 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1004 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1005 cpu_to_le32(lvid_get_unique_id(sb));
1006 }
1007 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1008 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1009 mark_inode_dirty(dir);
1010 up_write(&iinfo->i_data_sem);
1011 if (fibh.sbh != fibh.ebh)
1012 brelse(fibh.ebh);
1013 brelse(fibh.sbh);
1014 d_instantiate(dentry, inode);
1015 err = 0;
1016
1017 out:
1018 kfree(name);
1019 return err;
1020
1021 out_no_entry:
1022 up_write(&iinfo->i_data_sem);
1023 inode_dec_link_count(inode);
1024 iput(inode);
1025 goto out;
1026 }
1027
1028 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1029 struct dentry *dentry)
1030 {
1031 struct inode *inode = old_dentry->d_inode;
1032 struct udf_fileident_bh fibh;
1033 struct fileIdentDesc cfi, *fi;
1034 int err;
1035
1036 if (inode->i_nlink >= UDF_MAX_LINKS)
1037 return -EMLINK;
1038
1039 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1040 if (!fi) {
1041 return err;
1042 }
1043 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1044 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1045 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1046 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1047 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1048 }
1049 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1050 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1051 mark_inode_dirty(dir);
1052
1053 if (fibh.sbh != fibh.ebh)
1054 brelse(fibh.ebh);
1055 brelse(fibh.sbh);
1056 inc_nlink(inode);
1057 inode->i_ctime = current_fs_time(inode->i_sb);
1058 mark_inode_dirty(inode);
1059 ihold(inode);
1060 d_instantiate(dentry, inode);
1061
1062 return 0;
1063 }
1064
1065 /* Anybody can rename anything with this: the permission checks are left to the
1066 * higher-level routines.
1067 */
1068 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1069 struct inode *new_dir, struct dentry *new_dentry)
1070 {
1071 struct inode *old_inode = old_dentry->d_inode;
1072 struct inode *new_inode = new_dentry->d_inode;
1073 struct udf_fileident_bh ofibh, nfibh;
1074 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1075 struct fileIdentDesc ocfi, ncfi;
1076 struct buffer_head *dir_bh = NULL;
1077 int retval = -ENOENT;
1078 struct kernel_lb_addr tloc;
1079 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1080
1081 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1082 if (ofi) {
1083 if (ofibh.sbh != ofibh.ebh)
1084 brelse(ofibh.ebh);
1085 brelse(ofibh.sbh);
1086 }
1087 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1088 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1089 != old_inode->i_ino)
1090 goto end_rename;
1091
1092 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1093 if (nfi) {
1094 if (!new_inode) {
1095 if (nfibh.sbh != nfibh.ebh)
1096 brelse(nfibh.ebh);
1097 brelse(nfibh.sbh);
1098 nfi = NULL;
1099 }
1100 }
1101 if (S_ISDIR(old_inode->i_mode)) {
1102 int offset = udf_ext0_offset(old_inode);
1103
1104 if (new_inode) {
1105 retval = -ENOTEMPTY;
1106 if (!empty_dir(new_inode))
1107 goto end_rename;
1108 }
1109 retval = -EIO;
1110 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1111 dir_fi = udf_get_fileident(
1112 old_iinfo->i_ext.i_data -
1113 (old_iinfo->i_efe ?
1114 sizeof(struct extendedFileEntry) :
1115 sizeof(struct fileEntry)),
1116 old_inode->i_sb->s_blocksize, &offset);
1117 } else {
1118 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1119 if (!dir_bh)
1120 goto end_rename;
1121 dir_fi = udf_get_fileident(dir_bh->b_data,
1122 old_inode->i_sb->s_blocksize, &offset);
1123 }
1124 if (!dir_fi)
1125 goto end_rename;
1126 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1127 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1128 old_dir->i_ino)
1129 goto end_rename;
1130
1131 retval = -EMLINK;
1132 if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
1133 goto end_rename;
1134 }
1135 if (!nfi) {
1136 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1137 &retval);
1138 if (!nfi)
1139 goto end_rename;
1140 }
1141
1142 /*
1143 * Like most other Unix systems, set the ctime for inodes on a
1144 * rename.
1145 */
1146 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1147 mark_inode_dirty(old_inode);
1148
1149 /*
1150 * ok, that's it
1151 */
1152 ncfi.fileVersionNum = ocfi.fileVersionNum;
1153 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1154 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1155 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1156
1157 /* The old fid may have moved - find it again */
1158 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1159 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1160
1161 if (new_inode) {
1162 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1163 inode_dec_link_count(new_inode);
1164 }
1165 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1166 mark_inode_dirty(old_dir);
1167
1168 if (dir_fi) {
1169 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1170 udf_update_tag((char *)dir_fi,
1171 (sizeof(struct fileIdentDesc) +
1172 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1173 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1174 mark_inode_dirty(old_inode);
1175 else
1176 mark_buffer_dirty_inode(dir_bh, old_inode);
1177
1178 inode_dec_link_count(old_dir);
1179 if (new_inode)
1180 inode_dec_link_count(new_inode);
1181 else {
1182 inc_nlink(new_dir);
1183 mark_inode_dirty(new_dir);
1184 }
1185 }
1186
1187 if (ofi) {
1188 if (ofibh.sbh != ofibh.ebh)
1189 brelse(ofibh.ebh);
1190 brelse(ofibh.sbh);
1191 }
1192
1193 retval = 0;
1194
1195 end_rename:
1196 brelse(dir_bh);
1197 if (nfi) {
1198 if (nfibh.sbh != nfibh.ebh)
1199 brelse(nfibh.ebh);
1200 brelse(nfibh.sbh);
1201 }
1202
1203 return retval;
1204 }
1205
1206 static struct dentry *udf_get_parent(struct dentry *child)
1207 {
1208 struct kernel_lb_addr tloc;
1209 struct inode *inode = NULL;
1210 struct qstr dotdot = {.name = "..", .len = 2};
1211 struct fileIdentDesc cfi;
1212 struct udf_fileident_bh fibh;
1213
1214 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1215 goto out_unlock;
1216
1217 if (fibh.sbh != fibh.ebh)
1218 brelse(fibh.ebh);
1219 brelse(fibh.sbh);
1220
1221 tloc = lelb_to_cpu(cfi.icb.extLocation);
1222 inode = udf_iget(child->d_inode->i_sb, &tloc);
1223 if (!inode)
1224 goto out_unlock;
1225
1226 return d_obtain_alias(inode);
1227 out_unlock:
1228 return ERR_PTR(-EACCES);
1229 }
1230
1231
1232 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1233 u16 partref, __u32 generation)
1234 {
1235 struct inode *inode;
1236 struct kernel_lb_addr loc;
1237
1238 if (block == 0)
1239 return ERR_PTR(-ESTALE);
1240
1241 loc.logicalBlockNum = block;
1242 loc.partitionReferenceNum = partref;
1243 inode = udf_iget(sb, &loc);
1244
1245 if (inode == NULL)
1246 return ERR_PTR(-ENOMEM);
1247
1248 if (generation && inode->i_generation != generation) {
1249 iput(inode);
1250 return ERR_PTR(-ESTALE);
1251 }
1252 return d_obtain_alias(inode);
1253 }
1254
1255 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1256 struct fid *fid, int fh_len, int fh_type)
1257 {
1258 if ((fh_len != 3 && fh_len != 5) ||
1259 (fh_type != FILEID_UDF_WITH_PARENT &&
1260 fh_type != FILEID_UDF_WITHOUT_PARENT))
1261 return NULL;
1262
1263 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1264 fid->udf.generation);
1265 }
1266
1267 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1268 struct fid *fid, int fh_len, int fh_type)
1269 {
1270 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1271 return NULL;
1272
1273 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1274 fid->udf.parent_partref,
1275 fid->udf.parent_generation);
1276 }
1277 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1278 int connectable)
1279 {
1280 int len = *lenp;
1281 struct inode *inode = de->d_inode;
1282 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1283 struct fid *fid = (struct fid *)fh;
1284 int type = FILEID_UDF_WITHOUT_PARENT;
1285
1286 if (connectable && (len < 5)) {
1287 *lenp = 5;
1288 return 255;
1289 } else if (len < 3) {
1290 *lenp = 3;
1291 return 255;
1292 }
1293
1294 *lenp = 3;
1295 fid->udf.block = location.logicalBlockNum;
1296 fid->udf.partref = location.partitionReferenceNum;
1297 fid->udf.generation = inode->i_generation;
1298
1299 if (connectable && !S_ISDIR(inode->i_mode)) {
1300 spin_lock(&de->d_lock);
1301 inode = de->d_parent->d_inode;
1302 location = UDF_I(inode)->i_location;
1303 fid->udf.parent_block = location.logicalBlockNum;
1304 fid->udf.parent_partref = location.partitionReferenceNum;
1305 fid->udf.parent_generation = inode->i_generation;
1306 spin_unlock(&de->d_lock);
1307 *lenp = 5;
1308 type = FILEID_UDF_WITH_PARENT;
1309 }
1310
1311 return type;
1312 }
1313
1314 const struct export_operations udf_export_ops = {
1315 .encode_fh = udf_encode_fh,
1316 .fh_to_dentry = udf_fh_to_dentry,
1317 .fh_to_parent = udf_fh_to_parent,
1318 .get_parent = udf_get_parent,
1319 };
1320
1321 const struct inode_operations udf_dir_inode_operations = {
1322 .lookup = udf_lookup,
1323 .create = udf_create,
1324 .link = udf_link,
1325 .unlink = udf_unlink,
1326 .symlink = udf_symlink,
1327 .mkdir = udf_mkdir,
1328 .rmdir = udf_rmdir,
1329 .mknod = udf_mknod,
1330 .rename = udf_rename,
1331 };
1332 const struct inode_operations udf_symlink_inode_operations = {
1333 .readlink = generic_readlink,
1334 .follow_link = page_follow_link_light,
1335 .put_link = page_put_link,
1336 };
Linux kernel - Deliverables
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