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USB: serial gadget: descriptor cleanup
[linux-2.6/mini2440.git] / fs / udf / namei.c
blobd3231947db19edc3e4e592d3feadd7ab95e2c08a
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/quotaops.h>
31 #include <linux/smp_lock.h>
32 #include <linux/buffer_head.h>
33 #include <linux/sched.h>
34 #include <linux/crc-itu-t.h>
35 #include <linux/exportfs.h>
36
37 static inline int udf_match(int len1, const char *name1, int len2,
38 const 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(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(tag),
103 sizeof(struct fileIdentDesc) - sizeof(tag));
104
105 if (fibh->sbh == fibh->ebh) {
106 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
107 crclen + sizeof(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(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 struct dentry *dentry,
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 char *fname = NULL;
153 char *nameptr;
154 uint8_t lfi;
155 uint16_t liu;
156 loff_t size;
157 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 = dentry->d_name.len == 2 &&
163 dentry->d_name.name[0] == '.' && dentry->d_name.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(short_ad);
178 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
179 epos.offset -= sizeof(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 brelse(epos.bh);
234 return fi;
235 }
236
237 if (!lfi)
238 continue;
239
240 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
241 if (flen && udf_match(flen, fname, dentry->d_name.len,
242 dentry->d_name.name))
243 goto out_ok;
244 }
245
246 out_err:
247 fi = NULL;
248 if (fibh->sbh != fibh->ebh)
249 brelse(fibh->ebh);
250 brelse(fibh->sbh);
251 out_ok:
252 brelse(epos.bh);
253 kfree(fname);
254
255 return fi;
256 }
257
258 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
259 struct nameidata *nd)
260 {
261 struct inode *inode = NULL;
262 struct fileIdentDesc cfi;
263 struct udf_fileident_bh fibh;
264
265 if (dentry->d_name.len > UDF_NAME_LEN - 2)
266 return ERR_PTR(-ENAMETOOLONG);
267
268 lock_kernel();
269 #ifdef UDF_RECOVERY
270 /* temporary shorthand for specifying files by inode number */
271 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
272 kernel_lb_addr lb = {
273 .logicalBlockNum = 0,
274 .partitionReferenceNum =
275 simple_strtoul(dentry->d_name.name + 3,
276 NULL, 0),
277 };
278 inode = udf_iget(dir->i_sb, lb);
279 if (!inode) {
280 unlock_kernel();
281 return ERR_PTR(-EACCES);
282 }
283 } else
284 #endif /* UDF_RECOVERY */
285
286 if (udf_find_entry(dir, dentry, &fibh, &cfi)) {
287 if (fibh.sbh != fibh.ebh)
288 brelse(fibh.ebh);
289 brelse(fibh.sbh);
290
291 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
292 if (!inode) {
293 unlock_kernel();
294 return ERR_PTR(-EACCES);
295 }
296 }
297 unlock_kernel();
298
299 return d_splice_alias(inode, dentry);
300 }
301
302 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
303 struct dentry *dentry,
304 struct udf_fileident_bh *fibh,
305 struct fileIdentDesc *cfi, int *err)
306 {
307 struct super_block *sb = dir->i_sb;
308 struct fileIdentDesc *fi = NULL;
309 char *name = NULL;
310 int namelen;
311 loff_t f_pos;
312 loff_t size = udf_ext0_offset(dir) + dir->i_size;
313 int nfidlen;
314 uint8_t lfi;
315 uint16_t liu;
316 int block;
317 kernel_lb_addr eloc;
318 uint32_t elen = 0;
319 sector_t offset;
320 struct extent_position epos = {};
321 struct udf_inode_info *dinfo;
322
323 fibh->sbh = fibh->ebh = NULL;
324 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
325 if (!name) {
326 *err = -ENOMEM;
327 goto out_err;
328 }
329
330 if (dentry) {
331 if (!dentry->d_name.len) {
332 *err = -EINVAL;
333 goto out_err;
334 }
335 namelen = udf_put_filename(sb, dentry->d_name.name, name,
336 dentry->d_name.len);
337 if (!namelen) {
338 *err = -ENAMETOOLONG;
339 goto out_err;
340 }
341 } else {
342 namelen = 0;
343 }
344
345 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
346
347 f_pos = udf_ext0_offset(dir);
348
349 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
350 dinfo = UDF_I(dir);
351 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
352 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
353 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
354 block = udf_get_lb_pblock(dir->i_sb,
355 dinfo->i_location, 0);
356 fibh->soffset = fibh->eoffset = sb->s_blocksize;
357 goto add;
358 }
359 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
360 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
361 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
362 epos.offset -= sizeof(short_ad);
363 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
364 epos.offset -= sizeof(long_ad);
365 } else
366 offset = 0;
367
368 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
369 if (!fibh->sbh) {
370 *err = -EIO;
371 goto out_err;
372 }
373
374 block = dinfo->i_location.logicalBlockNum;
375 }
376
377 while (f_pos < size) {
378 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
379 &elen, &offset);
380
381 if (!fi) {
382 *err = -EIO;
383 goto out_err;
384 }
385
386 liu = le16_to_cpu(cfi->lengthOfImpUse);
387 lfi = cfi->lengthFileIdent;
388
389 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
390 if (((sizeof(struct fileIdentDesc) +
391 liu + lfi + 3) & ~3) == nfidlen) {
392 cfi->descTag.tagSerialNum = cpu_to_le16(1);
393 cfi->fileVersionNum = cpu_to_le16(1);
394 cfi->fileCharacteristics = 0;
395 cfi->lengthFileIdent = namelen;
396 cfi->lengthOfImpUse = cpu_to_le16(0);
397 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
398 name))
399 goto out_ok;
400 else {
401 *err = -EIO;
402 goto out_err;
403 }
404 }
405 }
406 }
407
408 add:
409 /* Is there any extent whose size we need to round up? */
410 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) {
411 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
412 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
413 epos.offset -= sizeof(short_ad);
414 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
415 epos.offset -= sizeof(long_ad);
416 udf_write_aext(dir, &epos, eloc, elen, 1);
417 }
418 f_pos += nfidlen;
419
420 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
421 sb->s_blocksize - fibh->eoffset < nfidlen) {
422 brelse(epos.bh);
423 epos.bh = NULL;
424 fibh->soffset -= udf_ext0_offset(dir);
425 fibh->eoffset -= udf_ext0_offset(dir);
426 f_pos -= udf_ext0_offset(dir);
427 if (fibh->sbh != fibh->ebh)
428 brelse(fibh->ebh);
429 brelse(fibh->sbh);
430 fibh->sbh = fibh->ebh =
431 udf_expand_dir_adinicb(dir, &block, err);
432 if (!fibh->sbh)
433 goto out_err;
434 epos.block = dinfo->i_location;
435 epos.offset = udf_file_entry_alloc_offset(dir);
436 /* Load extent udf_expand_dir_adinicb() has created */
437 udf_current_aext(dir, &epos, &eloc, &elen, 1);
438 }
439
440 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
441 fibh->soffset = fibh->eoffset;
442 fibh->eoffset += nfidlen;
443 if (fibh->sbh != fibh->ebh) {
444 brelse(fibh->sbh);
445 fibh->sbh = fibh->ebh;
446 }
447
448 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
449 block = dinfo->i_location.logicalBlockNum;
450 fi = (struct fileIdentDesc *)
451 (dinfo->i_ext.i_data +
452 fibh->soffset -
453 udf_ext0_offset(dir) +
454 dinfo->i_lenEAttr);
455 } else {
456 block = eloc.logicalBlockNum +
457 ((elen - 1) >>
458 dir->i_sb->s_blocksize_bits);
459 fi = (struct fileIdentDesc *)
460 (fibh->sbh->b_data + fibh->soffset);
461 }
462 } else {
463 fibh->soffset = fibh->eoffset - sb->s_blocksize;
464 fibh->eoffset += nfidlen - sb->s_blocksize;
465 if (fibh->sbh != fibh->ebh) {
466 brelse(fibh->sbh);
467 fibh->sbh = fibh->ebh;
468 }
469
470 block = eloc.logicalBlockNum + ((elen - 1) >>
471 dir->i_sb->s_blocksize_bits);
472 fibh->ebh = udf_bread(dir,
473 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
474 if (!fibh->ebh)
475 goto out_err;
476
477 if (!fibh->soffset) {
478 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
479 (EXT_RECORDED_ALLOCATED >> 30)) {
480 block = eloc.logicalBlockNum + ((elen - 1) >>
481 dir->i_sb->s_blocksize_bits);
482 } else
483 block++;
484
485 brelse(fibh->sbh);
486 fibh->sbh = fibh->ebh;
487 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
488 } else {
489 fi = (struct fileIdentDesc *)
490 (fibh->sbh->b_data + sb->s_blocksize +
491 fibh->soffset);
492 }
493 }
494
495 memset(cfi, 0, sizeof(struct fileIdentDesc));
496 if (UDF_SB(sb)->s_udfrev >= 0x0200)
497 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
498 sizeof(tag));
499 else
500 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
501 sizeof(tag));
502 cfi->fileVersionNum = cpu_to_le16(1);
503 cfi->lengthFileIdent = namelen;
504 cfi->lengthOfImpUse = cpu_to_le16(0);
505 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
506 dir->i_size += nfidlen;
507 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
508 dinfo->i_lenAlloc += nfidlen;
509 mark_inode_dirty(dir);
510 goto out_ok;
511 } else {
512 *err = -EIO;
513 goto out_err;
514 }
515
516 out_err:
517 fi = NULL;
518 if (fibh->sbh != fibh->ebh)
519 brelse(fibh->ebh);
520 brelse(fibh->sbh);
521 out_ok:
522 brelse(epos.bh);
523 kfree(name);
524 return fi;
525 }
526
527 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
528 struct udf_fileident_bh *fibh,
529 struct fileIdentDesc *cfi)
530 {
531 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
532
533 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
534 memset(&(cfi->icb), 0x00, sizeof(long_ad));
535
536 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
537 }
538
539 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
540 struct nameidata *nd)
541 {
542 struct udf_fileident_bh fibh;
543 struct inode *inode;
544 struct fileIdentDesc cfi, *fi;
545 int err;
546 struct udf_inode_info *iinfo;
547
548 lock_kernel();
549 inode = udf_new_inode(dir, mode, &err);
550 if (!inode) {
551 unlock_kernel();
552 return err;
553 }
554
555 iinfo = UDF_I(inode);
556 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
557 inode->i_data.a_ops = &udf_adinicb_aops;
558 else
559 inode->i_data.a_ops = &udf_aops;
560 inode->i_op = &udf_file_inode_operations;
561 inode->i_fop = &udf_file_operations;
562 inode->i_mode = mode;
563 mark_inode_dirty(inode);
564
565 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
566 if (!fi) {
567 inode->i_nlink--;
568 mark_inode_dirty(inode);
569 iput(inode);
570 unlock_kernel();
571 return err;
572 }
573 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
574 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
575 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
576 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
577 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
578 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
579 mark_inode_dirty(dir);
580 if (fibh.sbh != fibh.ebh)
581 brelse(fibh.ebh);
582 brelse(fibh.sbh);
583 unlock_kernel();
584 d_instantiate(dentry, inode);
585
586 return 0;
587 }
588
589 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
590 dev_t rdev)
591 {
592 struct inode *inode;
593 struct udf_fileident_bh fibh;
594 struct fileIdentDesc cfi, *fi;
595 int err;
596 struct udf_inode_info *iinfo;
597
598 if (!old_valid_dev(rdev))
599 return -EINVAL;
600
601 lock_kernel();
602 err = -EIO;
603 inode = udf_new_inode(dir, mode, &err);
604 if (!inode)
605 goto out;
606
607 iinfo = UDF_I(inode);
608 inode->i_uid = current->fsuid;
609 init_special_inode(inode, mode, rdev);
610 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
611 if (!fi) {
612 inode->i_nlink--;
613 mark_inode_dirty(inode);
614 iput(inode);
615 unlock_kernel();
616 return err;
617 }
618 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
619 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
620 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
621 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
622 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
623 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
624 mark_inode_dirty(dir);
625 mark_inode_dirty(inode);
626
627 if (fibh.sbh != fibh.ebh)
628 brelse(fibh.ebh);
629 brelse(fibh.sbh);
630 d_instantiate(dentry, inode);
631 err = 0;
632
633 out:
634 unlock_kernel();
635 return err;
636 }
637
638 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
639 {
640 struct inode *inode;
641 struct udf_fileident_bh fibh;
642 struct fileIdentDesc cfi, *fi;
643 int err;
644 struct udf_inode_info *dinfo = UDF_I(dir);
645 struct udf_inode_info *iinfo;
646
647 lock_kernel();
648 err = -EMLINK;
649 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
650 goto out;
651
652 err = -EIO;
653 inode = udf_new_inode(dir, S_IFDIR, &err);
654 if (!inode)
655 goto out;
656
657 iinfo = UDF_I(inode);
658 inode->i_op = &udf_dir_inode_operations;
659 inode->i_fop = &udf_dir_operations;
660 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
661 if (!fi) {
662 inode->i_nlink--;
663 mark_inode_dirty(inode);
664 iput(inode);
665 goto out;
666 }
667 inode->i_nlink = 2;
668 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
669 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
670 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
671 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
672 cfi.fileCharacteristics =
673 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
674 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
675 brelse(fibh.sbh);
676 inode->i_mode = S_IFDIR | mode;
677 if (dir->i_mode & S_ISGID)
678 inode->i_mode |= S_ISGID;
679 mark_inode_dirty(inode);
680
681 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
682 if (!fi) {
683 inode->i_nlink = 0;
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 unlock_kernel();
704 return err;
705 }
706
707 static int empty_dir(struct inode *dir)
708 {
709 struct fileIdentDesc *fi, cfi;
710 struct udf_fileident_bh fibh;
711 loff_t f_pos;
712 loff_t size = udf_ext0_offset(dir) + dir->i_size;
713 int block;
714 kernel_lb_addr eloc;
715 uint32_t elen;
716 sector_t offset;
717 struct extent_position epos = {};
718 struct udf_inode_info *dinfo = UDF_I(dir);
719
720 f_pos = udf_ext0_offset(dir);
721 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
722
723 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
724 fibh.sbh = fibh.ebh = NULL;
725 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
726 &epos, &eloc, &elen, &offset) ==
727 (EXT_RECORDED_ALLOCATED >> 30)) {
728 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
729 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
730 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
731 epos.offset -= sizeof(short_ad);
732 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
733 epos.offset -= sizeof(long_ad);
734 } else
735 offset = 0;
736
737 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
738 if (!fibh.sbh) {
739 brelse(epos.bh);
740 return 0;
741 }
742 } else {
743 brelse(epos.bh);
744 return 0;
745 }
746
747 while (f_pos < size) {
748 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
749 &elen, &offset);
750 if (!fi) {
751 if (fibh.sbh != fibh.ebh)
752 brelse(fibh.ebh);
753 brelse(fibh.sbh);
754 brelse(epos.bh);
755 return 0;
756 }
757
758 if (cfi.lengthFileIdent &&
759 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
760 if (fibh.sbh != fibh.ebh)
761 brelse(fibh.ebh);
762 brelse(fibh.sbh);
763 brelse(epos.bh);
764 return 0;
765 }
766 }
767
768 if (fibh.sbh != fibh.ebh)
769 brelse(fibh.ebh);
770 brelse(fibh.sbh);
771 brelse(epos.bh);
772
773 return 1;
774 }
775
776 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
777 {
778 int retval;
779 struct inode *inode = dentry->d_inode;
780 struct udf_fileident_bh fibh;
781 struct fileIdentDesc *fi, cfi;
782 kernel_lb_addr tloc;
783
784 retval = -ENOENT;
785 lock_kernel();
786 fi = udf_find_entry(dir, dentry, &fibh, &cfi);
787 if (!fi)
788 goto out;
789
790 retval = -EIO;
791 tloc = lelb_to_cpu(cfi.icb.extLocation);
792 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
793 goto end_rmdir;
794 retval = -ENOTEMPTY;
795 if (!empty_dir(inode))
796 goto end_rmdir;
797 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
798 if (retval)
799 goto end_rmdir;
800 if (inode->i_nlink != 2)
801 udf_warning(inode->i_sb, "udf_rmdir",
802 "empty directory has nlink != 2 (%d)",
803 inode->i_nlink);
804 clear_nlink(inode);
805 inode->i_size = 0;
806 inode_dec_link_count(dir);
807 inode->i_ctime = dir->i_ctime = dir->i_mtime =
808 current_fs_time(dir->i_sb);
809 mark_inode_dirty(dir);
810
811 end_rmdir:
812 if (fibh.sbh != fibh.ebh)
813 brelse(fibh.ebh);
814 brelse(fibh.sbh);
815
816 out:
817 unlock_kernel();
818 return retval;
819 }
820
821 static int udf_unlink(struct inode *dir, struct dentry *dentry)
822 {
823 int retval;
824 struct inode *inode = dentry->d_inode;
825 struct udf_fileident_bh fibh;
826 struct fileIdentDesc *fi;
827 struct fileIdentDesc cfi;
828 kernel_lb_addr tloc;
829
830 retval = -ENOENT;
831 lock_kernel();
832 fi = udf_find_entry(dir, dentry, &fibh, &cfi);
833 if (!fi)
834 goto out;
835
836 retval = -EIO;
837 tloc = lelb_to_cpu(cfi.icb.extLocation);
838 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
839 goto end_unlink;
840
841 if (!inode->i_nlink) {
842 udf_debug("Deleting nonexistent file (%lu), %d\n",
843 inode->i_ino, inode->i_nlink);
844 inode->i_nlink = 1;
845 }
846 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
847 if (retval)
848 goto end_unlink;
849 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
850 mark_inode_dirty(dir);
851 inode_dec_link_count(inode);
852 inode->i_ctime = dir->i_ctime;
853 retval = 0;
854
855 end_unlink:
856 if (fibh.sbh != fibh.ebh)
857 brelse(fibh.ebh);
858 brelse(fibh.sbh);
859
860 out:
861 unlock_kernel();
862 return retval;
863 }
864
865 static int udf_symlink(struct inode *dir, struct dentry *dentry,
866 const char *symname)
867 {
868 struct inode *inode;
869 struct pathComponent *pc;
870 char *compstart;
871 struct udf_fileident_bh fibh;
872 struct extent_position epos = {};
873 int eoffset, elen = 0;
874 struct fileIdentDesc *fi;
875 struct fileIdentDesc cfi;
876 char *ea;
877 int err;
878 int block;
879 char *name = NULL;
880 int namelen;
881 struct buffer_head *bh;
882 struct udf_inode_info *iinfo;
883
884 lock_kernel();
885 inode = udf_new_inode(dir, S_IFLNK, &err);
886 if (!inode)
887 goto out;
888
889 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
890 if (!name) {
891 err = -ENOMEM;
892 goto out_no_entry;
893 }
894
895 iinfo = UDF_I(inode);
896 inode->i_mode = S_IFLNK | S_IRWXUGO;
897 inode->i_data.a_ops = &udf_symlink_aops;
898 inode->i_op = &page_symlink_inode_operations;
899
900 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
901 kernel_lb_addr eloc;
902 uint32_t bsize;
903
904 block = udf_new_block(inode->i_sb, inode,
905 iinfo->i_location.partitionReferenceNum,
906 iinfo->i_location.logicalBlockNum, &err);
907 if (!block)
908 goto out_no_entry;
909 epos.block = iinfo->i_location;
910 epos.offset = udf_file_entry_alloc_offset(inode);
911 epos.bh = NULL;
912 eloc.logicalBlockNum = block;
913 eloc.partitionReferenceNum =
914 iinfo->i_location.partitionReferenceNum;
915 bsize = inode->i_sb->s_blocksize;
916 iinfo->i_lenExtents = bsize;
917 udf_add_aext(inode, &epos, eloc, bsize, 0);
918 brelse(epos.bh);
919
920 block = udf_get_pblock(inode->i_sb, block,
921 iinfo->i_location.partitionReferenceNum,
922 0);
923 epos.bh = udf_tread(inode->i_sb, block);
924 lock_buffer(epos.bh);
925 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
926 set_buffer_uptodate(epos.bh);
927 unlock_buffer(epos.bh);
928 mark_buffer_dirty_inode(epos.bh, inode);
929 ea = epos.bh->b_data + udf_ext0_offset(inode);
930 } else
931 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
932
933 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
934 pc = (struct pathComponent *)ea;
935
936 if (*symname == '/') {
937 do {
938 symname++;
939 } while (*symname == '/');
940
941 pc->componentType = 1;
942 pc->lengthComponentIdent = 0;
943 pc->componentFileVersionNum = 0;
944 pc += sizeof(struct pathComponent);
945 elen += sizeof(struct pathComponent);
946 }
947
948 err = -ENAMETOOLONG;
949
950 while (*symname) {
951 if (elen + sizeof(struct pathComponent) > eoffset)
952 goto out_no_entry;
953
954 pc = (struct pathComponent *)(ea + elen);
955
956 compstart = (char *)symname;
957
958 do {
959 symname++;
960 } while (*symname && *symname != '/');
961
962 pc->componentType = 5;
963 pc->lengthComponentIdent = 0;
964 pc->componentFileVersionNum = 0;
965 if (compstart[0] == '.') {
966 if ((symname - compstart) == 1)
967 pc->componentType = 4;
968 else if ((symname - compstart) == 2 &&
969 compstart[1] == '.')
970 pc->componentType = 3;
971 }
972
973 if (pc->componentType == 5) {
974 namelen = udf_put_filename(inode->i_sb, compstart, name,
975 symname - compstart);
976 if (!namelen)
977 goto out_no_entry;
978
979 if (elen + sizeof(struct pathComponent) + namelen >
980 eoffset)
981 goto out_no_entry;
982 else
983 pc->lengthComponentIdent = namelen;
984
985 memcpy(pc->componentIdent, name, namelen);
986 }
987
988 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
989
990 if (*symname) {
991 do {
992 symname++;
993 } while (*symname == '/');
994 }
995 }
996
997 brelse(epos.bh);
998 inode->i_size = elen;
999 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1000 iinfo->i_lenAlloc = inode->i_size;
1001 mark_inode_dirty(inode);
1002
1003 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1004 if (!fi)
1005 goto out_no_entry;
1006 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1007 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1008 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1009 if (bh) {
1010 struct logicalVolIntegrityDesc *lvid =
1011 (struct logicalVolIntegrityDesc *)bh->b_data;
1012 struct logicalVolHeaderDesc *lvhd;
1013 uint64_t uniqueID;
1014 lvhd = (struct logicalVolHeaderDesc *)
1015 lvid->logicalVolContentsUse;
1016 uniqueID = le64_to_cpu(lvhd->uniqueID);
1017 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1018 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1019 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1020 uniqueID += 16;
1021 lvhd->uniqueID = cpu_to_le64(uniqueID);
1022 mark_buffer_dirty(bh);
1023 }
1024 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1025 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1026 mark_inode_dirty(dir);
1027 if (fibh.sbh != fibh.ebh)
1028 brelse(fibh.ebh);
1029 brelse(fibh.sbh);
1030 d_instantiate(dentry, inode);
1031 err = 0;
1032
1033 out:
1034 kfree(name);
1035 unlock_kernel();
1036 return err;
1037
1038 out_no_entry:
1039 inode_dec_link_count(inode);
1040 iput(inode);
1041 goto out;
1042 }
1043
1044 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1045 struct dentry *dentry)
1046 {
1047 struct inode *inode = old_dentry->d_inode;
1048 struct udf_fileident_bh fibh;
1049 struct fileIdentDesc cfi, *fi;
1050 int err;
1051 struct buffer_head *bh;
1052
1053 lock_kernel();
1054 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1055 unlock_kernel();
1056 return -EMLINK;
1057 }
1058
1059 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1060 if (!fi) {
1061 unlock_kernel();
1062 return err;
1063 }
1064 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1065 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1066 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1067 if (bh) {
1068 struct logicalVolIntegrityDesc *lvid =
1069 (struct logicalVolIntegrityDesc *)bh->b_data;
1070 struct logicalVolHeaderDesc *lvhd;
1071 uint64_t uniqueID;
1072 lvhd = (struct logicalVolHeaderDesc *)
1073 (lvid->logicalVolContentsUse);
1074 uniqueID = le64_to_cpu(lvhd->uniqueID);
1075 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1076 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1077 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1078 uniqueID += 16;
1079 lvhd->uniqueID = cpu_to_le64(uniqueID);
1080 mark_buffer_dirty(bh);
1081 }
1082 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1083 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1084 mark_inode_dirty(dir);
1085
1086 if (fibh.sbh != fibh.ebh)
1087 brelse(fibh.ebh);
1088 brelse(fibh.sbh);
1089 inc_nlink(inode);
1090 inode->i_ctime = current_fs_time(inode->i_sb);
1091 mark_inode_dirty(inode);
1092 atomic_inc(&inode->i_count);
1093 d_instantiate(dentry, inode);
1094 unlock_kernel();
1095
1096 return 0;
1097 }
1098
1099 /* Anybody can rename anything with this: the permission checks are left to the
1100 * higher-level routines.
1101 */
1102 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1103 struct inode *new_dir, struct dentry *new_dentry)
1104 {
1105 struct inode *old_inode = old_dentry->d_inode;
1106 struct inode *new_inode = new_dentry->d_inode;
1107 struct udf_fileident_bh ofibh, nfibh;
1108 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1109 struct fileIdentDesc ocfi, ncfi;
1110 struct buffer_head *dir_bh = NULL;
1111 int retval = -ENOENT;
1112 kernel_lb_addr tloc;
1113 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1114
1115 lock_kernel();
1116 ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1117 if (ofi) {
1118 if (ofibh.sbh != ofibh.ebh)
1119 brelse(ofibh.ebh);
1120 brelse(ofibh.sbh);
1121 }
1122 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1123 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1124 != old_inode->i_ino)
1125 goto end_rename;
1126
1127 nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1128 if (nfi) {
1129 if (!new_inode) {
1130 if (nfibh.sbh != nfibh.ebh)
1131 brelse(nfibh.ebh);
1132 brelse(nfibh.sbh);
1133 nfi = NULL;
1134 }
1135 }
1136 if (S_ISDIR(old_inode->i_mode)) {
1137 int offset = udf_ext0_offset(old_inode);
1138
1139 if (new_inode) {
1140 retval = -ENOTEMPTY;
1141 if (!empty_dir(new_inode))
1142 goto end_rename;
1143 }
1144 retval = -EIO;
1145 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1146 dir_fi = udf_get_fileident(
1147 old_iinfo->i_ext.i_data -
1148 (old_iinfo->i_efe ?
1149 sizeof(struct extendedFileEntry) :
1150 sizeof(struct fileEntry)),
1151 old_inode->i_sb->s_blocksize, &offset);
1152 } else {
1153 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1154 if (!dir_bh)
1155 goto end_rename;
1156 dir_fi = udf_get_fileident(dir_bh->b_data,
1157 old_inode->i_sb->s_blocksize, &offset);
1158 }
1159 if (!dir_fi)
1160 goto end_rename;
1161 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1162 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) !=
1163 old_dir->i_ino)
1164 goto end_rename;
1165
1166 retval = -EMLINK;
1167 if (!new_inode &&
1168 new_dir->i_nlink >=
1169 (256 << sizeof(new_dir->i_nlink)) - 1)
1170 goto end_rename;
1171 }
1172 if (!nfi) {
1173 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1174 &retval);
1175 if (!nfi)
1176 goto end_rename;
1177 }
1178
1179 /*
1180 * Like most other Unix systems, set the ctime for inodes on a
1181 * rename.
1182 */
1183 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1184 mark_inode_dirty(old_inode);
1185
1186 /*
1187 * ok, that's it
1188 */
1189 ncfi.fileVersionNum = ocfi.fileVersionNum;
1190 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1191 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1192 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1193
1194 /* The old fid may have moved - find it again */
1195 ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1196 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1197
1198 if (new_inode) {
1199 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1200 inode_dec_link_count(new_inode);
1201 }
1202 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1203 mark_inode_dirty(old_dir);
1204
1205 if (dir_fi) {
1206 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1207 udf_update_tag((char *)dir_fi,
1208 (sizeof(struct fileIdentDesc) +
1209 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1210 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1211 mark_inode_dirty(old_inode);
1212 else
1213 mark_buffer_dirty_inode(dir_bh, old_inode);
1214
1215 inode_dec_link_count(old_dir);
1216 if (new_inode)
1217 inode_dec_link_count(new_inode);
1218 else {
1219 inc_nlink(new_dir);
1220 mark_inode_dirty(new_dir);
1221 }
1222 }
1223
1224 if (ofi) {
1225 if (ofibh.sbh != ofibh.ebh)
1226 brelse(ofibh.ebh);
1227 brelse(ofibh.sbh);
1228 }
1229
1230 retval = 0;
1231
1232 end_rename:
1233 brelse(dir_bh);
1234 if (nfi) {
1235 if (nfibh.sbh != nfibh.ebh)
1236 brelse(nfibh.ebh);
1237 brelse(nfibh.sbh);
1238 }
1239 unlock_kernel();
1240
1241 return retval;
1242 }
1243
1244 static struct dentry *udf_get_parent(struct dentry *child)
1245 {
1246 struct dentry *parent;
1247 struct inode *inode = NULL;
1248 struct dentry dotdot;
1249 struct fileIdentDesc cfi;
1250 struct udf_fileident_bh fibh;
1251
1252 dotdot.d_name.name = "..";
1253 dotdot.d_name.len = 2;
1254
1255 lock_kernel();
1256 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1257 goto out_unlock;
1258
1259 if (fibh.sbh != fibh.ebh)
1260 brelse(fibh.ebh);
1261 brelse(fibh.sbh);
1262
1263 inode = udf_iget(child->d_inode->i_sb,
1264 lelb_to_cpu(cfi.icb.extLocation));
1265 if (!inode)
1266 goto out_unlock;
1267 unlock_kernel();
1268
1269 parent = d_alloc_anon(inode);
1270 if (!parent) {
1271 iput(inode);
1272 parent = ERR_PTR(-ENOMEM);
1273 }
1274
1275 return parent;
1276 out_unlock:
1277 unlock_kernel();
1278 return ERR_PTR(-EACCES);
1279 }
1280
1281
1282 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1283 u16 partref, __u32 generation)
1284 {
1285 struct inode *inode;
1286 struct dentry *result;
1287 kernel_lb_addr loc;
1288
1289 if (block == 0)
1290 return ERR_PTR(-ESTALE);
1291
1292 loc.logicalBlockNum = block;
1293 loc.partitionReferenceNum = partref;
1294 inode = udf_iget(sb, loc);
1295
1296 if (inode == NULL)
1297 return ERR_PTR(-ENOMEM);
1298
1299 if (generation && inode->i_generation != generation) {
1300 iput(inode);
1301 return ERR_PTR(-ESTALE);
1302 }
1303 result = d_alloc_anon(inode);
1304 if (!result) {
1305 iput(inode);
1306 return ERR_PTR(-ENOMEM);
1307 }
1308 return result;
1309 }
1310
1311 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1312 struct fid *fid, int fh_len, int fh_type)
1313 {
1314 if ((fh_len != 3 && fh_len != 5) ||
1315 (fh_type != FILEID_UDF_WITH_PARENT &&
1316 fh_type != FILEID_UDF_WITHOUT_PARENT))
1317 return NULL;
1318
1319 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1320 fid->udf.generation);
1321 }
1322
1323 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1324 struct fid *fid, int fh_len, int fh_type)
1325 {
1326 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1327 return NULL;
1328
1329 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1330 fid->udf.parent_partref,
1331 fid->udf.parent_generation);
1332 }
1333 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1334 int connectable)
1335 {
1336 int len = *lenp;
1337 struct inode *inode = de->d_inode;
1338 kernel_lb_addr location = UDF_I(inode)->i_location;
1339 struct fid *fid = (struct fid *)fh;
1340 int type = FILEID_UDF_WITHOUT_PARENT;
1341
1342 if (len < 3 || (connectable && len < 5))
1343 return 255;
1344
1345 *lenp = 3;
1346 fid->udf.block = location.logicalBlockNum;
1347 fid->udf.partref = location.partitionReferenceNum;
1348 fid->udf.generation = inode->i_generation;
1349
1350 if (connectable && !S_ISDIR(inode->i_mode)) {
1351 spin_lock(&de->d_lock);
1352 inode = de->d_parent->d_inode;
1353 location = UDF_I(inode)->i_location;
1354 fid->udf.parent_block = location.logicalBlockNum;
1355 fid->udf.parent_partref = location.partitionReferenceNum;
1356 fid->udf.parent_generation = inode->i_generation;
1357 spin_unlock(&de->d_lock);
1358 *lenp = 5;
1359 type = FILEID_UDF_WITH_PARENT;
1360 }
1361
1362 return type;
1363 }
1364
1365 const struct export_operations udf_export_ops = {
1366 .encode_fh = udf_encode_fh,
1367 .fh_to_dentry = udf_fh_to_dentry,
1368 .fh_to_parent = udf_fh_to_parent,
1369 .get_parent = udf_get_parent,
1370 };
1371
1372 const struct inode_operations udf_dir_inode_operations = {
1373 .lookup = udf_lookup,
1374 .create = udf_create,
1375 .link = udf_link,
1376 .unlink = udf_unlink,
1377 .symlink = udf_symlink,
1378 .mkdir = udf_mkdir,
1379 .rmdir = udf_rmdir,
1380 .mknod = udf_mknod,
1381 .rename = udf_rename,
1382 };
Support for the Chinese Samsung S3C2440 based development boards