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udf: remove some ugly macros
[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/quotaops.h>
31 #include <linux/smp_lock.h>
32 #include <linux/buffer_head.h>
33 #include <linux/sched.h>
34
35 static inline int udf_match(int len1, const char *name1, int len2,
36 const char *name2)
37 {
38 if (len1 != len2)
39 return 0;
40
41 return !memcmp(name1, name2, len1);
42 }
43
44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
45 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
46 uint8_t * impuse, uint8_t * fileident)
47 {
48 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
49 uint16_t crc;
50 uint8_t checksum = 0;
51 int i;
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_ALLOCTYPE(inode) == 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, liu + offset);
72 }
73 }
74
75 offset += liu;
76
77 if (fileident) {
78 if (adinicb || (offset + lfi < 0)) {
79 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
80 } else if (offset >= 0) {
81 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
82 } else {
83 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset);
84 memcpy(fibh->ebh->b_data, fileident - offset, 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 = udf_crc((uint8_t *)cfi + sizeof(tag),
100 sizeof(struct fileIdentDesc) - sizeof(tag), 0);
101
102 if (fibh->sbh == fibh->ebh) {
103 crc = udf_crc((uint8_t *)sfi->impUse,
104 crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
105 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
106 crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset,
107 crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
108 } else {
109 crc = udf_crc((uint8_t *)sfi->impUse,
110 -fibh->soffset - sizeof(struct fileIdentDesc), crc);
111 crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
112 }
113
114 cfi->descTag.descCRC = cpu_to_le16(crc);
115 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
116
117 for (i = 0; i < 16; i++) {
118 if (i != 4)
119 checksum += ((uint8_t *)&cfi->descTag)[i];
120 }
121
122 cfi->descTag.tagChecksum = checksum;
123 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
124 memcpy((uint8_t *)sfi, (uint8_t *)cfi, 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 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
142 struct dentry *dentry,
143 struct udf_fileident_bh *fibh,
144 struct fileIdentDesc *cfi)
145 {
146 struct fileIdentDesc *fi = NULL;
147 loff_t f_pos;
148 int block, flen;
149 char fname[UDF_NAME_LEN];
150 char *nameptr;
151 uint8_t lfi;
152 uint16_t liu;
153 loff_t size;
154 kernel_lb_addr eloc;
155 uint32_t elen;
156 sector_t offset;
157 struct extent_position epos = {};
158
159 size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
160 f_pos = (udf_ext0_offset(dir) >> 2);
161
162 fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
163 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
164 fibh->sbh = fibh->ebh = NULL;
165 } else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
166 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
167 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
168 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
169 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
170 epos.offset -= sizeof(short_ad);
171 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
172 epos.offset -= sizeof(long_ad);
173 } else {
174 offset = 0;
175 }
176
177 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) {
178 brelse(epos.bh);
179 return NULL;
180 }
181 } else {
182 brelse(epos.bh);
183 return NULL;
184 }
185
186 while ((f_pos < size)) {
187 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
188 &elen, &offset);
189 if (!fi) {
190 if (fibh->sbh != fibh->ebh)
191 brelse(fibh->ebh);
192 brelse(fibh->sbh);
193 brelse(epos.bh);
194 return NULL;
195 }
196
197 liu = le16_to_cpu(cfi->lengthOfImpUse);
198 lfi = cfi->lengthFileIdent;
199
200 if (fibh->sbh == fibh->ebh) {
201 nameptr = fi->fileIdent + liu;
202 } else {
203 int poffset; /* Unpaded ending offset */
204
205 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
206
207 if (poffset >= lfi) {
208 nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
209 } else {
210 nameptr = fname;
211 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
212 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
213 }
214 }
215
216 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
217 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
218 continue;
219 }
220
221 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
222 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
223 continue;
224 }
225
226 if (!lfi)
227 continue;
228
229 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi))) {
230 if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) {
231 brelse(epos.bh);
232 return fi;
233 }
234 }
235 }
236
237 if (fibh->sbh != fibh->ebh)
238 brelse(fibh->ebh);
239 brelse(fibh->sbh);
240 brelse(epos.bh);
241
242 return NULL;
243 }
244
245 /*
246 * udf_lookup
247 *
248 * PURPOSE
249 * Look-up the inode for a given name.
250 *
251 * DESCRIPTION
252 * Required - lookup_dentry() will return -ENOTDIR if this routine is not
253 * available for a directory. The filesystem is useless if this routine is
254 * not available for at least the filesystem's root directory.
255 *
256 * This routine is passed an incomplete dentry - it must be completed by
257 * calling d_add(dentry, inode). If the name does not exist, then the
258 * specified inode must be set to null. An error should only be returned
259 * when the lookup fails for a reason other than the name not existing.
260 * Note that the directory inode semaphore is held during the call.
261 *
262 * Refer to lookup_dentry() in fs/namei.c
263 * lookup_dentry() -> lookup() -> real_lookup() -> .
264 *
265 * PRE-CONDITIONS
266 * dir Pointer to inode of parent directory.
267 * dentry Pointer to dentry to complete.
268 * nd Pointer to lookup nameidata
269 *
270 * POST-CONDITIONS
271 * <return> Zero on success.
272 *
273 * HISTORY
274 * July 1, 1997 - Andrew E. Mileski
275 * Written, tested, and released.
276 */
277
278 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
279 struct nameidata *nd)
280 {
281 struct inode *inode = NULL;
282 struct fileIdentDesc cfi;
283 struct udf_fileident_bh fibh;
284
285 if (dentry->d_name.len > UDF_NAME_LEN - 2)
286 return ERR_PTR(-ENAMETOOLONG);
287
288 lock_kernel();
289 #ifdef UDF_RECOVERY
290 /* temporary shorthand for specifying files by inode number */
291 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
292 kernel_lb_addr lb = {
293 .logicalBlockNum = 0,
294 .partitionReferenceNum = simple_strtoul(dentry->d_name.name + 3,
295 NULL, 0),
296 };
297 inode = udf_iget(dir->i_sb, lb);
298 if (!inode) {
299 unlock_kernel();
300 return ERR_PTR(-EACCES);
301 }
302 }
303 else
304 #endif /* UDF_RECOVERY */
305
306 if (udf_find_entry(dir, dentry, &fibh, &cfi)) {
307 if (fibh.sbh != fibh.ebh)
308 brelse(fibh.ebh);
309 brelse(fibh.sbh);
310
311 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
312 if (!inode) {
313 unlock_kernel();
314 return ERR_PTR(-EACCES);
315 }
316 }
317 unlock_kernel();
318 d_add(dentry, inode);
319
320 return NULL;
321 }
322
323 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
324 struct dentry *dentry,
325 struct udf_fileident_bh *fibh,
326 struct fileIdentDesc *cfi, int *err)
327 {
328 struct super_block *sb = dir->i_sb;
329 struct fileIdentDesc *fi = NULL;
330 char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
331 int namelen;
332 loff_t f_pos;
333 int flen;
334 char *nameptr;
335 loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
336 int nfidlen;
337 uint8_t lfi;
338 uint16_t liu;
339 int block;
340 kernel_lb_addr eloc;
341 uint32_t elen;
342 sector_t offset;
343 struct extent_position epos = {};
344
345 if (dentry) {
346 if (!dentry->d_name.len) {
347 *err = -EINVAL;
348 return NULL;
349 }
350 if (!(namelen = udf_put_filename(sb, dentry->d_name.name, name,
351 dentry->d_name.len))) {
352 *err = -ENAMETOOLONG;
353 return NULL;
354 }
355 } else {
356 namelen = 0;
357 }
358
359 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
360
361 f_pos = (udf_ext0_offset(dir) >> 2);
362
363 fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
364 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
365 fibh->sbh = fibh->ebh = NULL;
366 } else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
367 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
368 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
369 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
370 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
371 epos.offset -= sizeof(short_ad);
372 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
373 epos.offset -= sizeof(long_ad);
374 } else {
375 offset = 0;
376 }
377
378 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) {
379 brelse(epos.bh);
380 *err = -EIO;
381 return NULL;
382 }
383
384 block = UDF_I_LOCATION(dir).logicalBlockNum;
385
386 } else {
387 block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
388 fibh->sbh = fibh->ebh = NULL;
389 fibh->soffset = fibh->eoffset = sb->s_blocksize;
390 goto add;
391 }
392
393 while ((f_pos < size)) {
394 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
395 &elen, &offset);
396
397 if (!fi) {
398 if (fibh->sbh != fibh->ebh)
399 brelse(fibh->ebh);
400 brelse(fibh->sbh);
401 brelse(epos.bh);
402 *err = -EIO;
403 return NULL;
404 }
405
406 liu = le16_to_cpu(cfi->lengthOfImpUse);
407 lfi = cfi->lengthFileIdent;
408
409 if (fibh->sbh == fibh->ebh) {
410 nameptr = fi->fileIdent + liu;
411 } else {
412 int poffset; /* Unpaded ending offset */
413
414 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
415
416 if (poffset >= lfi) {
417 nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
418 } else {
419 nameptr = fname;
420 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
421 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
422 }
423 }
424
425 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
426 if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen) {
427 brelse(epos.bh);
428 cfi->descTag.tagSerialNum = cpu_to_le16(1);
429 cfi->fileVersionNum = cpu_to_le16(1);
430 cfi->fileCharacteristics = 0;
431 cfi->lengthFileIdent = namelen;
432 cfi->lengthOfImpUse = cpu_to_le16(0);
433 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
434 return fi;
435 } else {
436 *err = -EIO;
437 return NULL;
438 }
439 }
440 }
441
442 if (!lfi || !dentry)
443 continue;
444
445 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
446 udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) {
447 if (fibh->sbh != fibh->ebh)
448 brelse(fibh->ebh);
449 brelse(fibh->sbh);
450 brelse(epos.bh);
451 *err = -EEXIST;
452 return NULL;
453 }
454 }
455
456 add:
457 f_pos += nfidlen;
458
459 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
460 sb->s_blocksize - fibh->eoffset < nfidlen) {
461 brelse(epos.bh);
462 epos.bh = NULL;
463 fibh->soffset -= udf_ext0_offset(dir);
464 fibh->eoffset -= udf_ext0_offset(dir);
465 f_pos -= (udf_ext0_offset(dir) >> 2);
466 if (fibh->sbh != fibh->ebh)
467 brelse(fibh->ebh);
468 brelse(fibh->sbh);
469 if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
470 return NULL;
471 epos.block = UDF_I_LOCATION(dir);
472 eloc.logicalBlockNum = block;
473 eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
474 elen = dir->i_sb->s_blocksize;
475 epos.offset = udf_file_entry_alloc_offset(dir);
476 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
477 epos.offset += sizeof(short_ad);
478 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
479 epos.offset += sizeof(long_ad);
480 }
481
482 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
483 fibh->soffset = fibh->eoffset;
484 fibh->eoffset += nfidlen;
485 if (fibh->sbh != fibh->ebh) {
486 brelse(fibh->sbh);
487 fibh->sbh = fibh->ebh;
488 }
489
490 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
491 block = UDF_I_LOCATION(dir).logicalBlockNum;
492 fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset -
493 udf_ext0_offset(dir) +
494 UDF_I_LENEATTR(dir));
495 } else {
496 block = eloc.logicalBlockNum + ((elen - 1) >>
497 dir->i_sb->s_blocksize_bits);
498 fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
499 }
500 } else {
501 fibh->soffset = fibh->eoffset - sb->s_blocksize;
502 fibh->eoffset += nfidlen - sb->s_blocksize;
503 if (fibh->sbh != fibh->ebh) {
504 brelse(fibh->sbh);
505 fibh->sbh = fibh->ebh;
506 }
507
508 block = eloc.logicalBlockNum + ((elen - 1) >>
509 dir->i_sb->s_blocksize_bits);
510 fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err);
511 if (!fibh->ebh) {
512 brelse(epos.bh);
513 brelse(fibh->sbh);
514 return NULL;
515 }
516
517 if (!fibh->soffset) {
518 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
519 (EXT_RECORDED_ALLOCATED >> 30)) {
520 block = eloc.logicalBlockNum + ((elen - 1) >>
521 dir->i_sb->s_blocksize_bits);
522 } else {
523 block++;
524 }
525
526 brelse(fibh->sbh);
527 fibh->sbh = fibh->ebh;
528 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
529 } else {
530 fi = (struct fileIdentDesc *)
531 (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
532 }
533 }
534
535 memset(cfi, 0, sizeof(struct fileIdentDesc));
536 if (UDF_SB(sb)->s_udfrev >= 0x0200)
537 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
538 else
539 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
540 cfi->fileVersionNum = cpu_to_le16(1);
541 cfi->lengthFileIdent = namelen;
542 cfi->lengthOfImpUse = cpu_to_le16(0);
543 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
544 brelse(epos.bh);
545 dir->i_size += nfidlen;
546 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
547 UDF_I_LENALLOC(dir) += nfidlen;
548 mark_inode_dirty(dir);
549 return fi;
550 } else {
551 brelse(epos.bh);
552 if (fibh->sbh != fibh->ebh)
553 brelse(fibh->ebh);
554 brelse(fibh->sbh);
555 *err = -EIO;
556 return NULL;
557 }
558 }
559
560 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
561 struct udf_fileident_bh *fibh,
562 struct fileIdentDesc *cfi)
563 {
564 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
565
566 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
567 memset(&(cfi->icb), 0x00, sizeof(long_ad));
568
569 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
570 }
571
572 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
573 struct nameidata *nd)
574 {
575 struct udf_fileident_bh fibh;
576 struct inode *inode;
577 struct fileIdentDesc cfi, *fi;
578 int err;
579
580 lock_kernel();
581 inode = udf_new_inode(dir, mode, &err);
582 if (!inode) {
583 unlock_kernel();
584 return err;
585 }
586
587 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
588 inode->i_data.a_ops = &udf_adinicb_aops;
589 else
590 inode->i_data.a_ops = &udf_aops;
591 inode->i_op = &udf_file_inode_operations;
592 inode->i_fop = &udf_file_operations;
593 inode->i_mode = mode;
594 mark_inode_dirty(inode);
595
596 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
597 inode->i_nlink--;
598 mark_inode_dirty(inode);
599 iput(inode);
600 unlock_kernel();
601 return err;
602 }
603 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
604 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
605 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
606 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
607 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
608 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
609 mark_inode_dirty(dir);
610 }
611 if (fibh.sbh != fibh.ebh)
612 brelse(fibh.ebh);
613 brelse(fibh.sbh);
614 unlock_kernel();
615 d_instantiate(dentry, inode);
616
617 return 0;
618 }
619
620 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
621 dev_t rdev)
622 {
623 struct inode *inode;
624 struct udf_fileident_bh fibh;
625 struct fileIdentDesc cfi, *fi;
626 int err;
627
628 if (!old_valid_dev(rdev))
629 return -EINVAL;
630
631 lock_kernel();
632 err = -EIO;
633 inode = udf_new_inode(dir, mode, &err);
634 if (!inode)
635 goto out;
636
637 inode->i_uid = current->fsuid;
638 init_special_inode(inode, mode, rdev);
639 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
640 inode->i_nlink--;
641 mark_inode_dirty(inode);
642 iput(inode);
643 unlock_kernel();
644 return err;
645 }
646 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
647 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
648 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
649 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
650 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
651 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
652 mark_inode_dirty(dir);
653 }
654 mark_inode_dirty(inode);
655
656 if (fibh.sbh != fibh.ebh)
657 brelse(fibh.ebh);
658 brelse(fibh.sbh);
659 d_instantiate(dentry, inode);
660 err = 0;
661
662 out:
663 unlock_kernel();
664 return err;
665 }
666
667 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
668 {
669 struct inode *inode;
670 struct udf_fileident_bh fibh;
671 struct fileIdentDesc cfi, *fi;
672 int err;
673
674 lock_kernel();
675 err = -EMLINK;
676 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
677 goto out;
678
679 err = -EIO;
680 inode = udf_new_inode(dir, S_IFDIR, &err);
681 if (!inode)
682 goto out;
683
684 inode->i_op = &udf_dir_inode_operations;
685 inode->i_fop = &udf_dir_operations;
686 if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err))) {
687 inode->i_nlink--;
688 mark_inode_dirty(inode);
689 iput(inode);
690 goto out;
691 }
692 inode->i_nlink = 2;
693 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
694 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
695 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
696 cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
697 cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
698 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
699 brelse(fibh.sbh);
700 inode->i_mode = S_IFDIR | mode;
701 if (dir->i_mode & S_ISGID)
702 inode->i_mode |= S_ISGID;
703 mark_inode_dirty(inode);
704
705 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
706 inode->i_nlink = 0;
707 mark_inode_dirty(inode);
708 iput(inode);
709 goto out;
710 }
711 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
712 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
713 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
714 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
715 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
716 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
717 inc_nlink(dir);
718 mark_inode_dirty(dir);
719 d_instantiate(dentry, inode);
720 if (fibh.sbh != fibh.ebh)
721 brelse(fibh.ebh);
722 brelse(fibh.sbh);
723 err = 0;
724
725 out:
726 unlock_kernel();
727 return err;
728 }
729
730 static int empty_dir(struct inode *dir)
731 {
732 struct fileIdentDesc *fi, cfi;
733 struct udf_fileident_bh fibh;
734 loff_t f_pos;
735 loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
736 int block;
737 kernel_lb_addr eloc;
738 uint32_t elen;
739 sector_t offset;
740 struct extent_position epos = {};
741
742 f_pos = (udf_ext0_offset(dir) >> 2);
743
744 fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
745
746 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
747 fibh.sbh = fibh.ebh = NULL;
748 } else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
749 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
750 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
751 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
752 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
753 epos.offset -= sizeof(short_ad);
754 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
755 epos.offset -= sizeof(long_ad);
756 } else {
757 offset = 0;
758 }
759
760 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
761 brelse(epos.bh);
762 return 0;
763 }
764 } else {
765 brelse(epos.bh);
766 return 0;
767 }
768
769 while ((f_pos < size)) {
770 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
771 &elen, &offset);
772 if (!fi) {
773 if (fibh.sbh != fibh.ebh)
774 brelse(fibh.ebh);
775 brelse(fibh.sbh);
776 brelse(epos.bh);
777 return 0;
778 }
779
780 if (cfi.lengthFileIdent &&
781 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
782 if (fibh.sbh != fibh.ebh)
783 brelse(fibh.ebh);
784 brelse(fibh.sbh);
785 brelse(epos.bh);
786 return 0;
787 }
788 }
789
790 if (fibh.sbh != fibh.ebh)
791 brelse(fibh.ebh);
792 brelse(fibh.sbh);
793 brelse(epos.bh);
794
795 return 1;
796 }
797
798 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
799 {
800 int retval;
801 struct inode *inode = dentry->d_inode;
802 struct udf_fileident_bh fibh;
803 struct fileIdentDesc *fi, cfi;
804 kernel_lb_addr tloc;
805
806 retval = -ENOENT;
807 lock_kernel();
808 fi = udf_find_entry(dir, dentry, &fibh, &cfi);
809 if (!fi)
810 goto out;
811
812 retval = -EIO;
813 tloc = lelb_to_cpu(cfi.icb.extLocation);
814 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
815 goto end_rmdir;
816 retval = -ENOTEMPTY;
817 if (!empty_dir(inode))
818 goto end_rmdir;
819 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
820 if (retval)
821 goto end_rmdir;
822 if (inode->i_nlink != 2)
823 udf_warning(inode->i_sb, "udf_rmdir",
824 "empty directory has nlink != 2 (%d)",
825 inode->i_nlink);
826 clear_nlink(inode);
827 inode->i_size = 0;
828 inode_dec_link_count(dir);
829 inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
830 mark_inode_dirty(dir);
831
832 end_rmdir:
833 if (fibh.sbh != fibh.ebh)
834 brelse(fibh.ebh);
835 brelse(fibh.sbh);
836
837 out:
838 unlock_kernel();
839 return retval;
840 }
841
842 static int udf_unlink(struct inode *dir, struct dentry *dentry)
843 {
844 int retval;
845 struct inode *inode = dentry->d_inode;
846 struct udf_fileident_bh fibh;
847 struct fileIdentDesc *fi;
848 struct fileIdentDesc cfi;
849 kernel_lb_addr tloc;
850
851 retval = -ENOENT;
852 lock_kernel();
853 fi = udf_find_entry(dir, dentry, &fibh, &cfi);
854 if (!fi)
855 goto out;
856
857 retval = -EIO;
858 tloc = lelb_to_cpu(cfi.icb.extLocation);
859 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
860 goto end_unlink;
861
862 if (!inode->i_nlink) {
863 udf_debug("Deleting nonexistent file (%lu), %d\n",
864 inode->i_ino, inode->i_nlink);
865 inode->i_nlink = 1;
866 }
867 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
868 if (retval)
869 goto end_unlink;
870 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
871 mark_inode_dirty(dir);
872 inode_dec_link_count(inode);
873 inode->i_ctime = dir->i_ctime;
874 retval = 0;
875
876 end_unlink:
877 if (fibh.sbh != fibh.ebh)
878 brelse(fibh.ebh);
879 brelse(fibh.sbh);
880
881 out:
882 unlock_kernel();
883 return retval;
884 }
885
886 static int udf_symlink(struct inode *dir, struct dentry *dentry,
887 const char *symname)
888 {
889 struct inode *inode;
890 struct pathComponent *pc;
891 char *compstart;
892 struct udf_fileident_bh fibh;
893 struct extent_position epos = {};
894 int eoffset, elen = 0;
895 struct fileIdentDesc *fi;
896 struct fileIdentDesc cfi;
897 char *ea;
898 int err;
899 int block;
900 char name[UDF_NAME_LEN];
901 int namelen;
902 struct buffer_head *bh;
903
904 lock_kernel();
905 if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
906 goto out;
907
908 inode->i_mode = S_IFLNK | S_IRWXUGO;
909 inode->i_data.a_ops = &udf_symlink_aops;
910 inode->i_op = &page_symlink_inode_operations;
911
912 if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB) {
913 kernel_lb_addr eloc;
914 uint32_t elen;
915
916 block = udf_new_block(inode->i_sb, inode,
917 UDF_I_LOCATION(inode).partitionReferenceNum,
918 UDF_I_LOCATION(inode).logicalBlockNum, &err);
919 if (!block)
920 goto out_no_entry;
921 epos.block = UDF_I_LOCATION(inode);
922 epos.offset = udf_file_entry_alloc_offset(inode);
923 epos.bh = NULL;
924 eloc.logicalBlockNum = block;
925 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
926 elen = inode->i_sb->s_blocksize;
927 UDF_I_LENEXTENTS(inode) = elen;
928 udf_add_aext(inode, &epos, eloc, elen, 0);
929 brelse(epos.bh);
930
931 block = udf_get_pblock(inode->i_sb, block,
932 UDF_I_LOCATION(inode).partitionReferenceNum, 0);
933 epos.bh = udf_tread(inode->i_sb, block);
934 lock_buffer(epos.bh);
935 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
936 set_buffer_uptodate(epos.bh);
937 unlock_buffer(epos.bh);
938 mark_buffer_dirty_inode(epos.bh, inode);
939 ea = epos.bh->b_data + udf_ext0_offset(inode);
940 } else {
941 ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
942 }
943
944 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
945 pc = (struct pathComponent *)ea;
946
947 if (*symname == '/') {
948 do {
949 symname++;
950 } while (*symname == '/');
951
952 pc->componentType = 1;
953 pc->lengthComponentIdent = 0;
954 pc->componentFileVersionNum = 0;
955 pc += sizeof(struct pathComponent);
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 = (char *)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 && compstart[1] == '.')
980 pc->componentType = 3;
981 }
982
983 if (pc->componentType == 5) {
984 namelen = udf_put_filename(inode->i_sb, compstart, name,
985 symname - compstart);
986 if (!namelen)
987 goto out_no_entry;
988
989 if (elen + sizeof(struct pathComponent) + namelen > eoffset)
990 goto out_no_entry;
991 else
992 pc->lengthComponentIdent = namelen;
993
994 memcpy(pc->componentIdent, name, namelen);
995 }
996
997 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
998
999 if (*symname) {
1000 do {
1001 symname++;
1002 } while (*symname == '/');
1003 }
1004 }
1005
1006 brelse(epos.bh);
1007 inode->i_size = elen;
1008 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1009 UDF_I_LENALLOC(inode) = inode->i_size;
1010 mark_inode_dirty(inode);
1011
1012 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1013 goto out_no_entry;
1014 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1015 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1016 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1017 if (bh) {
1018 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1019 struct logicalVolHeaderDesc *lvhd;
1020 uint64_t uniqueID;
1021 lvhd = (struct logicalVolHeaderDesc *)(lvid->logicalVolContentsUse);
1022 uniqueID = le64_to_cpu(lvhd->uniqueID);
1023 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1024 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1025 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1026 uniqueID += 16;
1027 lvhd->uniqueID = cpu_to_le64(uniqueID);
1028 mark_buffer_dirty(bh);
1029 }
1030 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1031 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
1032 mark_inode_dirty(dir);
1033 }
1034 if (fibh.sbh != fibh.ebh)
1035 brelse(fibh.ebh);
1036 brelse(fibh.sbh);
1037 d_instantiate(dentry, inode);
1038 err = 0;
1039
1040 out:
1041 unlock_kernel();
1042 return err;
1043
1044 out_no_entry:
1045 inode_dec_link_count(inode);
1046 iput(inode);
1047 goto out;
1048 }
1049
1050 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1051 struct dentry *dentry)
1052 {
1053 struct inode *inode = old_dentry->d_inode;
1054 struct udf_fileident_bh fibh;
1055 struct fileIdentDesc cfi, *fi;
1056 int err;
1057 struct buffer_head *bh;
1058
1059 lock_kernel();
1060 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1061 unlock_kernel();
1062 return -EMLINK;
1063 }
1064
1065 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
1066 unlock_kernel();
1067 return err;
1068 }
1069 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1070 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1071 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1072 if (bh) {
1073 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1074 struct logicalVolHeaderDesc *lvhd;
1075 uint64_t uniqueID;
1076 lvhd = (struct logicalVolHeaderDesc *)(lvid->logicalVolContentsUse);
1077 uniqueID = le64_to_cpu(lvhd->uniqueID);
1078 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1079 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1080 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1081 uniqueID += 16;
1082 lvhd->uniqueID = cpu_to_le64(uniqueID);
1083 mark_buffer_dirty(bh);
1084 }
1085 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1086 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
1087 mark_inode_dirty(dir);
1088 }
1089
1090 if (fibh.sbh != fibh.ebh)
1091 brelse(fibh.ebh);
1092 brelse(fibh.sbh);
1093 inc_nlink(inode);
1094 inode->i_ctime = current_fs_time(inode->i_sb);
1095 mark_inode_dirty(inode);
1096 atomic_inc(&inode->i_count);
1097 d_instantiate(dentry, inode);
1098 unlock_kernel();
1099
1100 return 0;
1101 }
1102
1103 /* Anybody can rename anything with this: the permission checks are left to the
1104 * higher-level routines.
1105 */
1106 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1107 struct inode *new_dir, struct dentry *new_dentry)
1108 {
1109 struct inode *old_inode = old_dentry->d_inode;
1110 struct inode *new_inode = new_dentry->d_inode;
1111 struct udf_fileident_bh ofibh, nfibh;
1112 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
1113 struct buffer_head *dir_bh = NULL;
1114 int retval = -ENOENT;
1115 kernel_lb_addr tloc;
1116
1117 lock_kernel();
1118 if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi))) {
1119 if (ofibh.sbh != ofibh.ebh)
1120 brelse(ofibh.ebh);
1121 brelse(ofibh.sbh);
1122 }
1123 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1124 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1125 != old_inode->i_ino)
1126 goto end_rename;
1127
1128 nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1129 if (nfi) {
1130 if (!new_inode) {
1131 if (nfibh.sbh != nfibh.ebh)
1132 brelse(nfibh.ebh);
1133 brelse(nfibh.sbh);
1134 nfi = NULL;
1135 }
1136 }
1137 if (S_ISDIR(old_inode->i_mode)) {
1138 uint32_t offset = udf_ext0_offset(old_inode);
1139
1140 if (new_inode) {
1141 retval = -ENOTEMPTY;
1142 if (!empty_dir(new_inode))
1143 goto end_rename;
1144 }
1145 retval = -EIO;
1146 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) {
1147 dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
1148 (UDF_I_EFE(old_inode) ?
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, old_inode->i_sb->s_blocksize, &offset);
1157 }
1158 if (!dir_fi)
1159 goto end_rename;
1160 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1161 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) != old_dir->i_ino)
1162 goto end_rename;
1163
1164 retval = -EMLINK;
1165 if (!new_inode && new_dir->i_nlink >= (256 << sizeof(new_dir->i_nlink)) - 1)
1166 goto end_rename;
1167 }
1168 if (!nfi) {
1169 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
1170 if (!nfi)
1171 goto end_rename;
1172 }
1173
1174 /*
1175 * Like most other Unix systems, set the ctime for inodes on a
1176 * rename.
1177 */
1178 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1179 mark_inode_dirty(old_inode);
1180
1181 /*
1182 * ok, that's it
1183 */
1184 ncfi.fileVersionNum = ocfi.fileVersionNum;
1185 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1186 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1187 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1188
1189 /* The old fid may have moved - find it again */
1190 ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1191 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1192
1193 if (new_inode) {
1194 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1195 inode_dec_link_count(new_inode);
1196 }
1197 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1198 mark_inode_dirty(old_dir);
1199
1200 if (dir_fi) {
1201 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir));
1202 udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
1203 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1204 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) {
1205 mark_inode_dirty(old_inode);
1206 } else {
1207 mark_buffer_dirty_inode(dir_bh, old_inode);
1208 }
1209 inode_dec_link_count(old_dir);
1210 if (new_inode) {
1211 inode_dec_link_count(new_inode);
1212 } else {
1213 inc_nlink(new_dir);
1214 mark_inode_dirty(new_dir);
1215 }
1216 }
1217
1218 if (ofi) {
1219 if (ofibh.sbh != ofibh.ebh)
1220 brelse(ofibh.ebh);
1221 brelse(ofibh.sbh);
1222 }
1223
1224 retval = 0;
1225
1226 end_rename:
1227 brelse(dir_bh);
1228 if (nfi) {
1229 if (nfibh.sbh != nfibh.ebh)
1230 brelse(nfibh.ebh);
1231 brelse(nfibh.sbh);
1232 }
1233 unlock_kernel();
1234
1235 return retval;
1236 }
1237
1238 const struct inode_operations udf_dir_inode_operations = {
1239 .lookup = udf_lookup,
1240 .create = udf_create,
1241 .link = udf_link,
1242 .unlink = udf_unlink,
1243 .symlink = udf_symlink,
1244 .mkdir = udf_mkdir,
1245 .rmdir = udf_rmdir,
1246 .mknod = udf_mknod,
1247 .rename = udf_rename,
1248 };
Linux kernel - Deliverables
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