?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
perf_events, x86: AMD event scheduling
[linux-2.6/x86.git] / fs / udf / namei.c
blobcd2115060fdcc728aeefc7a21e80f6fc6af9c28c
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(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 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 char *fname = NULL;
153 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 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, child->len, child->name))
242 goto out_ok;
243 }
244
245 out_err:
246 fi = NULL;
247 if (fibh->sbh != fibh->ebh)
248 brelse(fibh->ebh);
249 brelse(fibh->sbh);
250 out_ok:
251 brelse(epos.bh);
252 kfree(fname);
253
254 return fi;
255 }
256
257 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
258 struct nameidata *nd)
259 {
260 struct inode *inode = NULL;
261 struct fileIdentDesc cfi;
262 struct udf_fileident_bh fibh;
263
264 if (dentry->d_name.len > UDF_NAME_LEN - 2)
265 return ERR_PTR(-ENAMETOOLONG);
266
267 lock_kernel();
268 #ifdef UDF_RECOVERY
269 /* temporary shorthand for specifying files by inode number */
270 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
271 struct kernel_lb_addr lb = {
272 .logicalBlockNum = 0,
273 .partitionReferenceNum =
274 simple_strtoul(dentry->d_name.name + 3,
275 NULL, 0),
276 };
277 inode = udf_iget(dir->i_sb, lb);
278 if (!inode) {
279 unlock_kernel();
280 return ERR_PTR(-EACCES);
281 }
282 } else
283 #endif /* UDF_RECOVERY */
284
285 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
286 struct kernel_lb_addr loc;
287
288 if (fibh.sbh != fibh.ebh)
289 brelse(fibh.ebh);
290 brelse(fibh.sbh);
291
292 loc = lelb_to_cpu(cfi.icb.extLocation);
293 inode = udf_iget(dir->i_sb, &loc);
294 if (!inode) {
295 unlock_kernel();
296 return ERR_PTR(-EACCES);
297 }
298 }
299 unlock_kernel();
300
301 return d_splice_alias(inode, dentry);
302 }
303
304 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
305 struct dentry *dentry,
306 struct udf_fileident_bh *fibh,
307 struct fileIdentDesc *cfi, int *err)
308 {
309 struct super_block *sb = dir->i_sb;
310 struct fileIdentDesc *fi = NULL;
311 char *name = NULL;
312 int namelen;
313 loff_t f_pos;
314 loff_t size = udf_ext0_offset(dir) + dir->i_size;
315 int nfidlen;
316 uint8_t lfi;
317 uint16_t liu;
318 int block;
319 struct kernel_lb_addr eloc;
320 uint32_t elen = 0;
321 sector_t offset;
322 struct extent_position epos = {};
323 struct udf_inode_info *dinfo;
324
325 fibh->sbh = fibh->ebh = NULL;
326 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
327 if (!name) {
328 *err = -ENOMEM;
329 goto out_err;
330 }
331
332 if (dentry) {
333 if (!dentry->d_name.len) {
334 *err = -EINVAL;
335 goto out_err;
336 }
337 namelen = udf_put_filename(sb, dentry->d_name.name, name,
338 dentry->d_name.len);
339 if (!namelen) {
340 *err = -ENAMETOOLONG;
341 goto out_err;
342 }
343 } else {
344 namelen = 0;
345 }
346
347 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
348
349 f_pos = udf_ext0_offset(dir);
350
351 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
352 dinfo = UDF_I(dir);
353 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
354 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
355 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
356 block = udf_get_lb_pblock(dir->i_sb,
357 &dinfo->i_location, 0);
358 fibh->soffset = fibh->eoffset = sb->s_blocksize;
359 goto add;
360 }
361 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
362 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
363 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
364 epos.offset -= sizeof(struct short_ad);
365 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
366 epos.offset -= sizeof(struct long_ad);
367 } else
368 offset = 0;
369
370 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
371 if (!fibh->sbh) {
372 *err = -EIO;
373 goto out_err;
374 }
375
376 block = dinfo->i_location.logicalBlockNum;
377 }
378
379 while (f_pos < size) {
380 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
381 &elen, &offset);
382
383 if (!fi) {
384 *err = -EIO;
385 goto out_err;
386 }
387
388 liu = le16_to_cpu(cfi->lengthOfImpUse);
389 lfi = cfi->lengthFileIdent;
390
391 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
392 if (((sizeof(struct fileIdentDesc) +
393 liu + lfi + 3) & ~3) == nfidlen) {
394 cfi->descTag.tagSerialNum = cpu_to_le16(1);
395 cfi->fileVersionNum = cpu_to_le16(1);
396 cfi->fileCharacteristics = 0;
397 cfi->lengthFileIdent = namelen;
398 cfi->lengthOfImpUse = cpu_to_le16(0);
399 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
400 name))
401 goto out_ok;
402 else {
403 *err = -EIO;
404 goto out_err;
405 }
406 }
407 }
408 }
409
410 add:
411 f_pos += nfidlen;
412
413 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
414 sb->s_blocksize - fibh->eoffset < nfidlen) {
415 brelse(epos.bh);
416 epos.bh = NULL;
417 fibh->soffset -= udf_ext0_offset(dir);
418 fibh->eoffset -= udf_ext0_offset(dir);
419 f_pos -= udf_ext0_offset(dir);
420 if (fibh->sbh != fibh->ebh)
421 brelse(fibh->ebh);
422 brelse(fibh->sbh);
423 fibh->sbh = fibh->ebh =
424 udf_expand_dir_adinicb(dir, &block, err);
425 if (!fibh->sbh)
426 goto out_err;
427 epos.block = dinfo->i_location;
428 epos.offset = udf_file_entry_alloc_offset(dir);
429 /* Load extent udf_expand_dir_adinicb() has created */
430 udf_current_aext(dir, &epos, &eloc, &elen, 1);
431 }
432
433 /* Entry fits into current block? */
434 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
435 fibh->soffset = fibh->eoffset;
436 fibh->eoffset += nfidlen;
437 if (fibh->sbh != fibh->ebh) {
438 brelse(fibh->sbh);
439 fibh->sbh = fibh->ebh;
440 }
441
442 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
443 block = dinfo->i_location.logicalBlockNum;
444 fi = (struct fileIdentDesc *)
445 (dinfo->i_ext.i_data +
446 fibh->soffset -
447 udf_ext0_offset(dir) +
448 dinfo->i_lenEAttr);
449 } else {
450 block = eloc.logicalBlockNum +
451 ((elen - 1) >>
452 dir->i_sb->s_blocksize_bits);
453 fi = (struct fileIdentDesc *)
454 (fibh->sbh->b_data + fibh->soffset);
455 }
456 } else {
457 /* Round up last extent in the file */
458 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
459 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
460 epos.offset -= sizeof(struct short_ad);
461 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
462 epos.offset -= sizeof(struct long_ad);
463 udf_write_aext(dir, &epos, &eloc, elen, 1);
464 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
465 - 1) & ~(sb->s_blocksize - 1);
466
467 fibh->soffset = fibh->eoffset - sb->s_blocksize;
468 fibh->eoffset += nfidlen - sb->s_blocksize;
469 if (fibh->sbh != fibh->ebh) {
470 brelse(fibh->sbh);
471 fibh->sbh = fibh->ebh;
472 }
473
474 block = eloc.logicalBlockNum + ((elen - 1) >>
475 dir->i_sb->s_blocksize_bits);
476 fibh->ebh = udf_bread(dir,
477 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
478 if (!fibh->ebh)
479 goto out_err;
480
481 if (!fibh->soffset) {
482 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
483 (EXT_RECORDED_ALLOCATED >> 30)) {
484 block = eloc.logicalBlockNum + ((elen - 1) >>
485 dir->i_sb->s_blocksize_bits);
486 } else
487 block++;
488
489 brelse(fibh->sbh);
490 fibh->sbh = fibh->ebh;
491 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
492 } else {
493 fi = (struct fileIdentDesc *)
494 (fibh->sbh->b_data + sb->s_blocksize +
495 fibh->soffset);
496 }
497 }
498
499 memset(cfi, 0, sizeof(struct fileIdentDesc));
500 if (UDF_SB(sb)->s_udfrev >= 0x0200)
501 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
502 sizeof(struct tag));
503 else
504 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
505 sizeof(struct tag));
506 cfi->fileVersionNum = cpu_to_le16(1);
507 cfi->lengthFileIdent = namelen;
508 cfi->lengthOfImpUse = cpu_to_le16(0);
509 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
510 dir->i_size += nfidlen;
511 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
512 dinfo->i_lenAlloc += nfidlen;
513 else {
514 /* Find the last extent and truncate it to proper size */
515 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
516 (EXT_RECORDED_ALLOCATED >> 30))
517 ;
518 elen -= dinfo->i_lenExtents - dir->i_size;
519 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
520 epos.offset -= sizeof(struct short_ad);
521 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
522 epos.offset -= sizeof(struct long_ad);
523 udf_write_aext(dir, &epos, &eloc, elen, 1);
524 dinfo->i_lenExtents = dir->i_size;
525 }
526
527 mark_inode_dirty(dir);
528 goto out_ok;
529 } else {
530 *err = -EIO;
531 goto out_err;
532 }
533
534 out_err:
535 fi = NULL;
536 if (fibh->sbh != fibh->ebh)
537 brelse(fibh->ebh);
538 brelse(fibh->sbh);
539 out_ok:
540 brelse(epos.bh);
541 kfree(name);
542 return fi;
543 }
544
545 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
546 struct udf_fileident_bh *fibh,
547 struct fileIdentDesc *cfi)
548 {
549 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
550
551 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
552 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
553
554 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
555 }
556
557 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
558 struct nameidata *nd)
559 {
560 struct udf_fileident_bh fibh;
561 struct inode *inode;
562 struct fileIdentDesc cfi, *fi;
563 int err;
564 struct udf_inode_info *iinfo;
565
566 lock_kernel();
567 inode = udf_new_inode(dir, mode, &err);
568 if (!inode) {
569 unlock_kernel();
570 return err;
571 }
572
573 iinfo = UDF_I(inode);
574 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
575 inode->i_data.a_ops = &udf_adinicb_aops;
576 else
577 inode->i_data.a_ops = &udf_aops;
578 inode->i_op = &udf_file_inode_operations;
579 inode->i_fop = &udf_file_operations;
580 inode->i_mode = mode;
581 mark_inode_dirty(inode);
582
583 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
584 if (!fi) {
585 inode->i_nlink--;
586 mark_inode_dirty(inode);
587 iput(inode);
588 unlock_kernel();
589 return err;
590 }
591 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
592 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
593 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
594 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
595 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
596 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
597 mark_inode_dirty(dir);
598 if (fibh.sbh != fibh.ebh)
599 brelse(fibh.ebh);
600 brelse(fibh.sbh);
601 unlock_kernel();
602 d_instantiate(dentry, inode);
603
604 return 0;
605 }
606
607 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
608 dev_t rdev)
609 {
610 struct inode *inode;
611 struct udf_fileident_bh fibh;
612 struct fileIdentDesc cfi, *fi;
613 int err;
614 struct udf_inode_info *iinfo;
615
616 if (!old_valid_dev(rdev))
617 return -EINVAL;
618
619 lock_kernel();
620 err = -EIO;
621 inode = udf_new_inode(dir, mode, &err);
622 if (!inode)
623 goto out;
624
625 iinfo = UDF_I(inode);
626 inode->i_uid = current_fsuid();
627 init_special_inode(inode, mode, rdev);
628 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
629 if (!fi) {
630 inode->i_nlink--;
631 mark_inode_dirty(inode);
632 iput(inode);
633 unlock_kernel();
634 return err;
635 }
636 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
637 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
638 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
639 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
640 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
641 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
642 mark_inode_dirty(dir);
643 mark_inode_dirty(inode);
644
645 if (fibh.sbh != fibh.ebh)
646 brelse(fibh.ebh);
647 brelse(fibh.sbh);
648 d_instantiate(dentry, inode);
649 err = 0;
650
651 out:
652 unlock_kernel();
653 return err;
654 }
655
656 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
657 {
658 struct inode *inode;
659 struct udf_fileident_bh fibh;
660 struct fileIdentDesc cfi, *fi;
661 int err;
662 struct udf_inode_info *dinfo = UDF_I(dir);
663 struct udf_inode_info *iinfo;
664
665 lock_kernel();
666 err = -EMLINK;
667 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
668 goto out;
669
670 err = -EIO;
671 inode = udf_new_inode(dir, S_IFDIR, &err);
672 if (!inode)
673 goto out;
674
675 iinfo = UDF_I(inode);
676 inode->i_op = &udf_dir_inode_operations;
677 inode->i_fop = &udf_dir_operations;
678 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
679 if (!fi) {
680 inode->i_nlink--;
681 mark_inode_dirty(inode);
682 iput(inode);
683 goto out;
684 }
685 inode->i_nlink = 2;
686 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
687 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
688 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
689 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
690 cfi.fileCharacteristics =
691 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
692 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
693 brelse(fibh.sbh);
694 inode->i_mode = S_IFDIR | mode;
695 if (dir->i_mode & S_ISGID)
696 inode->i_mode |= S_ISGID;
697 mark_inode_dirty(inode);
698
699 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
700 if (!fi) {
701 inode->i_nlink = 0;
702 mark_inode_dirty(inode);
703 iput(inode);
704 goto out;
705 }
706 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
707 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
708 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
709 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
710 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
711 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
712 inc_nlink(dir);
713 mark_inode_dirty(dir);
714 d_instantiate(dentry, inode);
715 if (fibh.sbh != fibh.ebh)
716 brelse(fibh.ebh);
717 brelse(fibh.sbh);
718 err = 0;
719
720 out:
721 unlock_kernel();
722 return err;
723 }
724
725 static int empty_dir(struct inode *dir)
726 {
727 struct fileIdentDesc *fi, cfi;
728 struct udf_fileident_bh fibh;
729 loff_t f_pos;
730 loff_t size = udf_ext0_offset(dir) + dir->i_size;
731 int block;
732 struct kernel_lb_addr eloc;
733 uint32_t elen;
734 sector_t offset;
735 struct extent_position epos = {};
736 struct udf_inode_info *dinfo = UDF_I(dir);
737
738 f_pos = udf_ext0_offset(dir);
739 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
740
741 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
742 fibh.sbh = fibh.ebh = NULL;
743 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
744 &epos, &eloc, &elen, &offset) ==
745 (EXT_RECORDED_ALLOCATED >> 30)) {
746 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
747 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
748 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
749 epos.offset -= sizeof(struct short_ad);
750 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
751 epos.offset -= sizeof(struct long_ad);
752 } else
753 offset = 0;
754
755 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
756 if (!fibh.sbh) {
757 brelse(epos.bh);
758 return 0;
759 }
760 } else {
761 brelse(epos.bh);
762 return 0;
763 }
764
765 while (f_pos < size) {
766 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
767 &elen, &offset);
768 if (!fi) {
769 if (fibh.sbh != fibh.ebh)
770 brelse(fibh.ebh);
771 brelse(fibh.sbh);
772 brelse(epos.bh);
773 return 0;
774 }
775
776 if (cfi.lengthFileIdent &&
777 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
778 if (fibh.sbh != fibh.ebh)
779 brelse(fibh.ebh);
780 brelse(fibh.sbh);
781 brelse(epos.bh);
782 return 0;
783 }
784 }
785
786 if (fibh.sbh != fibh.ebh)
787 brelse(fibh.ebh);
788 brelse(fibh.sbh);
789 brelse(epos.bh);
790
791 return 1;
792 }
793
794 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
795 {
796 int retval;
797 struct inode *inode = dentry->d_inode;
798 struct udf_fileident_bh fibh;
799 struct fileIdentDesc *fi, cfi;
800 struct kernel_lb_addr tloc;
801
802 retval = -ENOENT;
803 lock_kernel();
804 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
805 if (!fi)
806 goto out;
807
808 retval = -EIO;
809 tloc = lelb_to_cpu(cfi.icb.extLocation);
810 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
811 goto end_rmdir;
812 retval = -ENOTEMPTY;
813 if (!empty_dir(inode))
814 goto end_rmdir;
815 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
816 if (retval)
817 goto end_rmdir;
818 if (inode->i_nlink != 2)
819 udf_warning(inode->i_sb, "udf_rmdir",
820 "empty directory has nlink != 2 (%d)",
821 inode->i_nlink);
822 clear_nlink(inode);
823 inode->i_size = 0;
824 inode_dec_link_count(dir);
825 inode->i_ctime = dir->i_ctime = dir->i_mtime =
826 current_fs_time(dir->i_sb);
827 mark_inode_dirty(dir);
828
829 end_rmdir:
830 if (fibh.sbh != fibh.ebh)
831 brelse(fibh.ebh);
832 brelse(fibh.sbh);
833
834 out:
835 unlock_kernel();
836 return retval;
837 }
838
839 static int udf_unlink(struct inode *dir, struct dentry *dentry)
840 {
841 int retval;
842 struct inode *inode = dentry->d_inode;
843 struct udf_fileident_bh fibh;
844 struct fileIdentDesc *fi;
845 struct fileIdentDesc cfi;
846 struct kernel_lb_addr tloc;
847
848 retval = -ENOENT;
849 lock_kernel();
850 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
851 if (!fi)
852 goto out;
853
854 retval = -EIO;
855 tloc = lelb_to_cpu(cfi.icb.extLocation);
856 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
857 goto end_unlink;
858
859 if (!inode->i_nlink) {
860 udf_debug("Deleting nonexistent file (%lu), %d\n",
861 inode->i_ino, inode->i_nlink);
862 inode->i_nlink = 1;
863 }
864 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
865 if (retval)
866 goto end_unlink;
867 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
868 mark_inode_dirty(dir);
869 inode_dec_link_count(inode);
870 inode->i_ctime = dir->i_ctime;
871 retval = 0;
872
873 end_unlink:
874 if (fibh.sbh != fibh.ebh)
875 brelse(fibh.ebh);
876 brelse(fibh.sbh);
877
878 out:
879 unlock_kernel();
880 return retval;
881 }
882
883 static int udf_symlink(struct inode *dir, struct dentry *dentry,
884 const char *symname)
885 {
886 struct inode *inode;
887 struct pathComponent *pc;
888 char *compstart;
889 struct udf_fileident_bh fibh;
890 struct extent_position epos = {};
891 int eoffset, elen = 0;
892 struct fileIdentDesc *fi;
893 struct fileIdentDesc cfi;
894 char *ea;
895 int err;
896 int block;
897 char *name = NULL;
898 int namelen;
899 struct buffer_head *bh;
900 struct udf_inode_info *iinfo;
901
902 lock_kernel();
903 inode = udf_new_inode(dir, S_IFLNK, &err);
904 if (!inode)
905 goto out;
906
907 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
908 if (!name) {
909 err = -ENOMEM;
910 goto out_no_entry;
911 }
912
913 iinfo = UDF_I(inode);
914 inode->i_mode = S_IFLNK | S_IRWXUGO;
915 inode->i_data.a_ops = &udf_symlink_aops;
916 inode->i_op = &page_symlink_inode_operations;
917
918 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
919 struct kernel_lb_addr eloc;
920 uint32_t bsize;
921
922 block = udf_new_block(inode->i_sb, inode,
923 iinfo->i_location.partitionReferenceNum,
924 iinfo->i_location.logicalBlockNum, &err);
925 if (!block)
926 goto out_no_entry;
927 epos.block = iinfo->i_location;
928 epos.offset = udf_file_entry_alloc_offset(inode);
929 epos.bh = NULL;
930 eloc.logicalBlockNum = block;
931 eloc.partitionReferenceNum =
932 iinfo->i_location.partitionReferenceNum;
933 bsize = inode->i_sb->s_blocksize;
934 iinfo->i_lenExtents = bsize;
935 udf_add_aext(inode, &epos, &eloc, bsize, 0);
936 brelse(epos.bh);
937
938 block = udf_get_pblock(inode->i_sb, block,
939 iinfo->i_location.partitionReferenceNum,
940 0);
941 epos.bh = udf_tgetblk(inode->i_sb, block);
942 lock_buffer(epos.bh);
943 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
944 set_buffer_uptodate(epos.bh);
945 unlock_buffer(epos.bh);
946 mark_buffer_dirty_inode(epos.bh, inode);
947 ea = epos.bh->b_data + udf_ext0_offset(inode);
948 } else
949 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
950
951 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
952 pc = (struct pathComponent *)ea;
953
954 if (*symname == '/') {
955 do {
956 symname++;
957 } while (*symname == '/');
958
959 pc->componentType = 1;
960 pc->lengthComponentIdent = 0;
961 pc->componentFileVersionNum = 0;
962 elen += sizeof(struct pathComponent);
963 }
964
965 err = -ENAMETOOLONG;
966
967 while (*symname) {
968 if (elen + sizeof(struct pathComponent) > eoffset)
969 goto out_no_entry;
970
971 pc = (struct pathComponent *)(ea + elen);
972
973 compstart = (char *)symname;
974
975 do {
976 symname++;
977 } while (*symname && *symname != '/');
978
979 pc->componentType = 5;
980 pc->lengthComponentIdent = 0;
981 pc->componentFileVersionNum = 0;
982 if (compstart[0] == '.') {
983 if ((symname - compstart) == 1)
984 pc->componentType = 4;
985 else if ((symname - compstart) == 2 &&
986 compstart[1] == '.')
987 pc->componentType = 3;
988 }
989
990 if (pc->componentType == 5) {
991 namelen = udf_put_filename(inode->i_sb, compstart, name,
992 symname - compstart);
993 if (!namelen)
994 goto out_no_entry;
995
996 if (elen + sizeof(struct pathComponent) + namelen >
997 eoffset)
998 goto out_no_entry;
999 else
1000 pc->lengthComponentIdent = namelen;
1001
1002 memcpy(pc->componentIdent, name, namelen);
1003 }
1004
1005 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1006
1007 if (*symname) {
1008 do {
1009 symname++;
1010 } while (*symname == '/');
1011 }
1012 }
1013
1014 brelse(epos.bh);
1015 inode->i_size = elen;
1016 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1017 iinfo->i_lenAlloc = inode->i_size;
1018 else
1019 udf_truncate_tail_extent(inode);
1020 mark_inode_dirty(inode);
1021
1022 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1023 if (!fi)
1024 goto out_no_entry;
1025 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1026 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1027 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1028 if (bh) {
1029 struct logicalVolIntegrityDesc *lvid =
1030 (struct logicalVolIntegrityDesc *)bh->b_data;
1031 struct logicalVolHeaderDesc *lvhd;
1032 uint64_t uniqueID;
1033 lvhd = (struct logicalVolHeaderDesc *)
1034 lvid->logicalVolContentsUse;
1035 uniqueID = le64_to_cpu(lvhd->uniqueID);
1036 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1037 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1038 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1039 uniqueID += 16;
1040 lvhd->uniqueID = cpu_to_le64(uniqueID);
1041 mark_buffer_dirty(bh);
1042 }
1043 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1044 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1045 mark_inode_dirty(dir);
1046 if (fibh.sbh != fibh.ebh)
1047 brelse(fibh.ebh);
1048 brelse(fibh.sbh);
1049 d_instantiate(dentry, inode);
1050 err = 0;
1051
1052 out:
1053 kfree(name);
1054 unlock_kernel();
1055 return err;
1056
1057 out_no_entry:
1058 inode_dec_link_count(inode);
1059 iput(inode);
1060 goto out;
1061 }
1062
1063 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1064 struct dentry *dentry)
1065 {
1066 struct inode *inode = old_dentry->d_inode;
1067 struct udf_fileident_bh fibh;
1068 struct fileIdentDesc cfi, *fi;
1069 int err;
1070 struct buffer_head *bh;
1071
1072 lock_kernel();
1073 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1074 unlock_kernel();
1075 return -EMLINK;
1076 }
1077
1078 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1079 if (!fi) {
1080 unlock_kernel();
1081 return err;
1082 }
1083 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1084 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1085 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1086 if (bh) {
1087 struct logicalVolIntegrityDesc *lvid =
1088 (struct logicalVolIntegrityDesc *)bh->b_data;
1089 struct logicalVolHeaderDesc *lvhd;
1090 uint64_t uniqueID;
1091 lvhd = (struct logicalVolHeaderDesc *)
1092 (lvid->logicalVolContentsUse);
1093 uniqueID = le64_to_cpu(lvhd->uniqueID);
1094 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1095 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1096 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1097 uniqueID += 16;
1098 lvhd->uniqueID = cpu_to_le64(uniqueID);
1099 mark_buffer_dirty(bh);
1100 }
1101 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1102 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1103 mark_inode_dirty(dir);
1104
1105 if (fibh.sbh != fibh.ebh)
1106 brelse(fibh.ebh);
1107 brelse(fibh.sbh);
1108 inc_nlink(inode);
1109 inode->i_ctime = current_fs_time(inode->i_sb);
1110 mark_inode_dirty(inode);
1111 atomic_inc(&inode->i_count);
1112 d_instantiate(dentry, inode);
1113 unlock_kernel();
1114
1115 return 0;
1116 }
1117
1118 /* Anybody can rename anything with this: the permission checks are left to the
1119 * higher-level routines.
1120 */
1121 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1122 struct inode *new_dir, struct dentry *new_dentry)
1123 {
1124 struct inode *old_inode = old_dentry->d_inode;
1125 struct inode *new_inode = new_dentry->d_inode;
1126 struct udf_fileident_bh ofibh, nfibh;
1127 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1128 struct fileIdentDesc ocfi, ncfi;
1129 struct buffer_head *dir_bh = NULL;
1130 int retval = -ENOENT;
1131 struct kernel_lb_addr tloc;
1132 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1133
1134 lock_kernel();
1135 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1136 if (ofi) {
1137 if (ofibh.sbh != ofibh.ebh)
1138 brelse(ofibh.ebh);
1139 brelse(ofibh.sbh);
1140 }
1141 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1142 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1143 != old_inode->i_ino)
1144 goto end_rename;
1145
1146 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1147 if (nfi) {
1148 if (!new_inode) {
1149 if (nfibh.sbh != nfibh.ebh)
1150 brelse(nfibh.ebh);
1151 brelse(nfibh.sbh);
1152 nfi = NULL;
1153 }
1154 }
1155 if (S_ISDIR(old_inode->i_mode)) {
1156 int offset = udf_ext0_offset(old_inode);
1157
1158 if (new_inode) {
1159 retval = -ENOTEMPTY;
1160 if (!empty_dir(new_inode))
1161 goto end_rename;
1162 }
1163 retval = -EIO;
1164 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1165 dir_fi = udf_get_fileident(
1166 old_iinfo->i_ext.i_data -
1167 (old_iinfo->i_efe ?
1168 sizeof(struct extendedFileEntry) :
1169 sizeof(struct fileEntry)),
1170 old_inode->i_sb->s_blocksize, &offset);
1171 } else {
1172 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1173 if (!dir_bh)
1174 goto end_rename;
1175 dir_fi = udf_get_fileident(dir_bh->b_data,
1176 old_inode->i_sb->s_blocksize, &offset);
1177 }
1178 if (!dir_fi)
1179 goto end_rename;
1180 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1181 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1182 old_dir->i_ino)
1183 goto end_rename;
1184
1185 retval = -EMLINK;
1186 if (!new_inode &&
1187 new_dir->i_nlink >=
1188 (256 << sizeof(new_dir->i_nlink)) - 1)
1189 goto end_rename;
1190 }
1191 if (!nfi) {
1192 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1193 &retval);
1194 if (!nfi)
1195 goto end_rename;
1196 }
1197
1198 /*
1199 * Like most other Unix systems, set the ctime for inodes on a
1200 * rename.
1201 */
1202 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1203 mark_inode_dirty(old_inode);
1204
1205 /*
1206 * ok, that's it
1207 */
1208 ncfi.fileVersionNum = ocfi.fileVersionNum;
1209 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1210 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1211 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1212
1213 /* The old fid may have moved - find it again */
1214 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1215 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1216
1217 if (new_inode) {
1218 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1219 inode_dec_link_count(new_inode);
1220 }
1221 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1222 mark_inode_dirty(old_dir);
1223
1224 if (dir_fi) {
1225 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1226 udf_update_tag((char *)dir_fi,
1227 (sizeof(struct fileIdentDesc) +
1228 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1229 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1230 mark_inode_dirty(old_inode);
1231 else
1232 mark_buffer_dirty_inode(dir_bh, old_inode);
1233
1234 inode_dec_link_count(old_dir);
1235 if (new_inode)
1236 inode_dec_link_count(new_inode);
1237 else {
1238 inc_nlink(new_dir);
1239 mark_inode_dirty(new_dir);
1240 }
1241 }
1242
1243 if (ofi) {
1244 if (ofibh.sbh != ofibh.ebh)
1245 brelse(ofibh.ebh);
1246 brelse(ofibh.sbh);
1247 }
1248
1249 retval = 0;
1250
1251 end_rename:
1252 brelse(dir_bh);
1253 if (nfi) {
1254 if (nfibh.sbh != nfibh.ebh)
1255 brelse(nfibh.ebh);
1256 brelse(nfibh.sbh);
1257 }
1258 unlock_kernel();
1259
1260 return retval;
1261 }
1262
1263 static struct dentry *udf_get_parent(struct dentry *child)
1264 {
1265 struct kernel_lb_addr tloc;
1266 struct inode *inode = NULL;
1267 struct qstr dotdot = {.name = "..", .len = 2};
1268 struct fileIdentDesc cfi;
1269 struct udf_fileident_bh fibh;
1270
1271 lock_kernel();
1272 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1273 goto out_unlock;
1274
1275 if (fibh.sbh != fibh.ebh)
1276 brelse(fibh.ebh);
1277 brelse(fibh.sbh);
1278
1279 tloc = lelb_to_cpu(cfi.icb.extLocation);
1280 inode = udf_iget(child->d_inode->i_sb, &tloc);
1281 if (!inode)
1282 goto out_unlock;
1283 unlock_kernel();
1284
1285 return d_obtain_alias(inode);
1286 out_unlock:
1287 unlock_kernel();
1288 return ERR_PTR(-EACCES);
1289 }
1290
1291
1292 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1293 u16 partref, __u32 generation)
1294 {
1295 struct inode *inode;
1296 struct kernel_lb_addr loc;
1297
1298 if (block == 0)
1299 return ERR_PTR(-ESTALE);
1300
1301 loc.logicalBlockNum = block;
1302 loc.partitionReferenceNum = partref;
1303 inode = udf_iget(sb, &loc);
1304
1305 if (inode == NULL)
1306 return ERR_PTR(-ENOMEM);
1307
1308 if (generation && inode->i_generation != generation) {
1309 iput(inode);
1310 return ERR_PTR(-ESTALE);
1311 }
1312 return d_obtain_alias(inode);
1313 }
1314
1315 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1316 struct fid *fid, int fh_len, int fh_type)
1317 {
1318 if ((fh_len != 3 && fh_len != 5) ||
1319 (fh_type != FILEID_UDF_WITH_PARENT &&
1320 fh_type != FILEID_UDF_WITHOUT_PARENT))
1321 return NULL;
1322
1323 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1324 fid->udf.generation);
1325 }
1326
1327 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1328 struct fid *fid, int fh_len, int fh_type)
1329 {
1330 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1331 return NULL;
1332
1333 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1334 fid->udf.parent_partref,
1335 fid->udf.parent_generation);
1336 }
1337 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1338 int connectable)
1339 {
1340 int len = *lenp;
1341 struct inode *inode = de->d_inode;
1342 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1343 struct fid *fid = (struct fid *)fh;
1344 int type = FILEID_UDF_WITHOUT_PARENT;
1345
1346 if (len < 3 || (connectable && len < 5))
1347 return 255;
1348
1349 *lenp = 3;
1350 fid->udf.block = location.logicalBlockNum;
1351 fid->udf.partref = location.partitionReferenceNum;
1352 fid->udf.generation = inode->i_generation;
1353
1354 if (connectable && !S_ISDIR(inode->i_mode)) {
1355 spin_lock(&de->d_lock);
1356 inode = de->d_parent->d_inode;
1357 location = UDF_I(inode)->i_location;
1358 fid->udf.parent_block = location.logicalBlockNum;
1359 fid->udf.parent_partref = location.partitionReferenceNum;
1360 fid->udf.parent_generation = inode->i_generation;
1361 spin_unlock(&de->d_lock);
1362 *lenp = 5;
1363 type = FILEID_UDF_WITH_PARENT;
1364 }
1365
1366 return type;
1367 }
1368
1369 const struct export_operations udf_export_ops = {
1370 .encode_fh = udf_encode_fh,
1371 .fh_to_dentry = udf_fh_to_dentry,
1372 .fh_to_parent = udf_fh_to_parent,
1373 .get_parent = udf_get_parent,
1374 };
1375
1376 const struct inode_operations udf_dir_inode_operations = {
1377 .lookup = udf_lookup,
1378 .create = udf_create,
1379 .link = udf_link,
1380 .unlink = udf_unlink,
1381 .symlink = udf_symlink,
1382 .mkdir = udf_mkdir,
1383 .rmdir = udf_rmdir,
1384 .mknod = udf_mknod,
1385 .rename = udf_rename,
1386 };
x86 "subsystem" repository