?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
thinkpad-acpi: make volume subdriver optional
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / namei.c
blob6a29fa34c478490cc45732af39072e78fee180e0
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 /* Is there any extent whose size we need to round up? */
412 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) {
413 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
414 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
415 epos.offset -= sizeof(struct short_ad);
416 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
417 epos.offset -= sizeof(struct long_ad);
418 udf_write_aext(dir, &epos, &eloc, elen, 1);
419 }
420 f_pos += nfidlen;
421
422 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
423 sb->s_blocksize - fibh->eoffset < nfidlen) {
424 brelse(epos.bh);
425 epos.bh = NULL;
426 fibh->soffset -= udf_ext0_offset(dir);
427 fibh->eoffset -= udf_ext0_offset(dir);
428 f_pos -= udf_ext0_offset(dir);
429 if (fibh->sbh != fibh->ebh)
430 brelse(fibh->ebh);
431 brelse(fibh->sbh);
432 fibh->sbh = fibh->ebh =
433 udf_expand_dir_adinicb(dir, &block, err);
434 if (!fibh->sbh)
435 goto out_err;
436 epos.block = dinfo->i_location;
437 epos.offset = udf_file_entry_alloc_offset(dir);
438 /* Load extent udf_expand_dir_adinicb() has created */
439 udf_current_aext(dir, &epos, &eloc, &elen, 1);
440 }
441
442 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
443 fibh->soffset = fibh->eoffset;
444 fibh->eoffset += nfidlen;
445 if (fibh->sbh != fibh->ebh) {
446 brelse(fibh->sbh);
447 fibh->sbh = fibh->ebh;
448 }
449
450 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
451 block = dinfo->i_location.logicalBlockNum;
452 fi = (struct fileIdentDesc *)
453 (dinfo->i_ext.i_data +
454 fibh->soffset -
455 udf_ext0_offset(dir) +
456 dinfo->i_lenEAttr);
457 } else {
458 block = eloc.logicalBlockNum +
459 ((elen - 1) >>
460 dir->i_sb->s_blocksize_bits);
461 fi = (struct fileIdentDesc *)
462 (fibh->sbh->b_data + fibh->soffset);
463 }
464 } else {
465 fibh->soffset = fibh->eoffset - sb->s_blocksize;
466 fibh->eoffset += nfidlen - sb->s_blocksize;
467 if (fibh->sbh != fibh->ebh) {
468 brelse(fibh->sbh);
469 fibh->sbh = fibh->ebh;
470 }
471
472 block = eloc.logicalBlockNum + ((elen - 1) >>
473 dir->i_sb->s_blocksize_bits);
474 fibh->ebh = udf_bread(dir,
475 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
476 if (!fibh->ebh)
477 goto out_err;
478
479 if (!fibh->soffset) {
480 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
481 (EXT_RECORDED_ALLOCATED >> 30)) {
482 block = eloc.logicalBlockNum + ((elen - 1) >>
483 dir->i_sb->s_blocksize_bits);
484 } else
485 block++;
486
487 brelse(fibh->sbh);
488 fibh->sbh = fibh->ebh;
489 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
490 } else {
491 fi = (struct fileIdentDesc *)
492 (fibh->sbh->b_data + sb->s_blocksize +
493 fibh->soffset);
494 }
495 }
496
497 memset(cfi, 0, sizeof(struct fileIdentDesc));
498 if (UDF_SB(sb)->s_udfrev >= 0x0200)
499 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
500 sizeof(struct tag));
501 else
502 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
503 sizeof(struct tag));
504 cfi->fileVersionNum = cpu_to_le16(1);
505 cfi->lengthFileIdent = namelen;
506 cfi->lengthOfImpUse = cpu_to_le16(0);
507 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
508 dir->i_size += nfidlen;
509 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
510 dinfo->i_lenAlloc += nfidlen;
511 mark_inode_dirty(dir);
512 goto out_ok;
513 } else {
514 *err = -EIO;
515 goto out_err;
516 }
517
518 out_err:
519 fi = NULL;
520 if (fibh->sbh != fibh->ebh)
521 brelse(fibh->ebh);
522 brelse(fibh->sbh);
523 out_ok:
524 brelse(epos.bh);
525 kfree(name);
526 return fi;
527 }
528
529 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
530 struct udf_fileident_bh *fibh,
531 struct fileIdentDesc *cfi)
532 {
533 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
534
535 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
536 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
537
538 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
539 }
540
541 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
542 struct nameidata *nd)
543 {
544 struct udf_fileident_bh fibh;
545 struct inode *inode;
546 struct fileIdentDesc cfi, *fi;
547 int err;
548 struct udf_inode_info *iinfo;
549
550 lock_kernel();
551 inode = udf_new_inode(dir, mode, &err);
552 if (!inode) {
553 unlock_kernel();
554 return err;
555 }
556
557 iinfo = UDF_I(inode);
558 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
559 inode->i_data.a_ops = &udf_adinicb_aops;
560 else
561 inode->i_data.a_ops = &udf_aops;
562 inode->i_op = &udf_file_inode_operations;
563 inode->i_fop = &udf_file_operations;
564 inode->i_mode = mode;
565 mark_inode_dirty(inode);
566
567 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
568 if (!fi) {
569 inode->i_nlink--;
570 mark_inode_dirty(inode);
571 iput(inode);
572 unlock_kernel();
573 return err;
574 }
575 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
576 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
577 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
578 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
579 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
580 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
581 mark_inode_dirty(dir);
582 if (fibh.sbh != fibh.ebh)
583 brelse(fibh.ebh);
584 brelse(fibh.sbh);
585 unlock_kernel();
586 d_instantiate(dentry, inode);
587
588 return 0;
589 }
590
591 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
592 dev_t rdev)
593 {
594 struct inode *inode;
595 struct udf_fileident_bh fibh;
596 struct fileIdentDesc cfi, *fi;
597 int err;
598 struct udf_inode_info *iinfo;
599
600 if (!old_valid_dev(rdev))
601 return -EINVAL;
602
603 lock_kernel();
604 err = -EIO;
605 inode = udf_new_inode(dir, mode, &err);
606 if (!inode)
607 goto out;
608
609 iinfo = UDF_I(inode);
610 inode->i_uid = current_fsuid();
611 init_special_inode(inode, mode, rdev);
612 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
613 if (!fi) {
614 inode->i_nlink--;
615 mark_inode_dirty(inode);
616 iput(inode);
617 unlock_kernel();
618 return err;
619 }
620 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
621 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
622 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
623 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
624 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
625 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
626 mark_inode_dirty(dir);
627 mark_inode_dirty(inode);
628
629 if (fibh.sbh != fibh.ebh)
630 brelse(fibh.ebh);
631 brelse(fibh.sbh);
632 d_instantiate(dentry, inode);
633 err = 0;
634
635 out:
636 unlock_kernel();
637 return err;
638 }
639
640 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
641 {
642 struct inode *inode;
643 struct udf_fileident_bh fibh;
644 struct fileIdentDesc cfi, *fi;
645 int err;
646 struct udf_inode_info *dinfo = UDF_I(dir);
647 struct udf_inode_info *iinfo;
648
649 lock_kernel();
650 err = -EMLINK;
651 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
652 goto out;
653
654 err = -EIO;
655 inode = udf_new_inode(dir, S_IFDIR, &err);
656 if (!inode)
657 goto out;
658
659 iinfo = UDF_I(inode);
660 inode->i_op = &udf_dir_inode_operations;
661 inode->i_fop = &udf_dir_operations;
662 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
663 if (!fi) {
664 inode->i_nlink--;
665 mark_inode_dirty(inode);
666 iput(inode);
667 goto out;
668 }
669 inode->i_nlink = 2;
670 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
671 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
672 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
673 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
674 cfi.fileCharacteristics =
675 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
676 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
677 brelse(fibh.sbh);
678 inode->i_mode = S_IFDIR | mode;
679 if (dir->i_mode & S_ISGID)
680 inode->i_mode |= S_ISGID;
681 mark_inode_dirty(inode);
682
683 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
684 if (!fi) {
685 inode->i_nlink = 0;
686 mark_inode_dirty(inode);
687 iput(inode);
688 goto out;
689 }
690 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
691 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
692 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
693 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
694 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
695 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
696 inc_nlink(dir);
697 mark_inode_dirty(dir);
698 d_instantiate(dentry, inode);
699 if (fibh.sbh != fibh.ebh)
700 brelse(fibh.ebh);
701 brelse(fibh.sbh);
702 err = 0;
703
704 out:
705 unlock_kernel();
706 return err;
707 }
708
709 static int empty_dir(struct inode *dir)
710 {
711 struct fileIdentDesc *fi, cfi;
712 struct udf_fileident_bh fibh;
713 loff_t f_pos;
714 loff_t size = udf_ext0_offset(dir) + dir->i_size;
715 int block;
716 struct kernel_lb_addr eloc;
717 uint32_t elen;
718 sector_t offset;
719 struct extent_position epos = {};
720 struct udf_inode_info *dinfo = UDF_I(dir);
721
722 f_pos = udf_ext0_offset(dir);
723 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
724
725 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
726 fibh.sbh = fibh.ebh = NULL;
727 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
728 &epos, &eloc, &elen, &offset) ==
729 (EXT_RECORDED_ALLOCATED >> 30)) {
730 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
731 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
732 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
733 epos.offset -= sizeof(struct short_ad);
734 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
735 epos.offset -= sizeof(struct long_ad);
736 } else
737 offset = 0;
738
739 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
740 if (!fibh.sbh) {
741 brelse(epos.bh);
742 return 0;
743 }
744 } else {
745 brelse(epos.bh);
746 return 0;
747 }
748
749 while (f_pos < size) {
750 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
751 &elen, &offset);
752 if (!fi) {
753 if (fibh.sbh != fibh.ebh)
754 brelse(fibh.ebh);
755 brelse(fibh.sbh);
756 brelse(epos.bh);
757 return 0;
758 }
759
760 if (cfi.lengthFileIdent &&
761 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
762 if (fibh.sbh != fibh.ebh)
763 brelse(fibh.ebh);
764 brelse(fibh.sbh);
765 brelse(epos.bh);
766 return 0;
767 }
768 }
769
770 if (fibh.sbh != fibh.ebh)
771 brelse(fibh.ebh);
772 brelse(fibh.sbh);
773 brelse(epos.bh);
774
775 return 1;
776 }
777
778 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
779 {
780 int retval;
781 struct inode *inode = dentry->d_inode;
782 struct udf_fileident_bh fibh;
783 struct fileIdentDesc *fi, cfi;
784 struct kernel_lb_addr tloc;
785
786 retval = -ENOENT;
787 lock_kernel();
788 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
789 if (!fi)
790 goto out;
791
792 retval = -EIO;
793 tloc = lelb_to_cpu(cfi.icb.extLocation);
794 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
795 goto end_rmdir;
796 retval = -ENOTEMPTY;
797 if (!empty_dir(inode))
798 goto end_rmdir;
799 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
800 if (retval)
801 goto end_rmdir;
802 if (inode->i_nlink != 2)
803 udf_warning(inode->i_sb, "udf_rmdir",
804 "empty directory has nlink != 2 (%d)",
805 inode->i_nlink);
806 clear_nlink(inode);
807 inode->i_size = 0;
808 inode_dec_link_count(dir);
809 inode->i_ctime = dir->i_ctime = dir->i_mtime =
810 current_fs_time(dir->i_sb);
811 mark_inode_dirty(dir);
812
813 end_rmdir:
814 if (fibh.sbh != fibh.ebh)
815 brelse(fibh.ebh);
816 brelse(fibh.sbh);
817
818 out:
819 unlock_kernel();
820 return retval;
821 }
822
823 static int udf_unlink(struct inode *dir, struct dentry *dentry)
824 {
825 int retval;
826 struct inode *inode = dentry->d_inode;
827 struct udf_fileident_bh fibh;
828 struct fileIdentDesc *fi;
829 struct fileIdentDesc cfi;
830 struct kernel_lb_addr tloc;
831
832 retval = -ENOENT;
833 lock_kernel();
834 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
835 if (!fi)
836 goto out;
837
838 retval = -EIO;
839 tloc = lelb_to_cpu(cfi.icb.extLocation);
840 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
841 goto end_unlink;
842
843 if (!inode->i_nlink) {
844 udf_debug("Deleting nonexistent file (%lu), %d\n",
845 inode->i_ino, inode->i_nlink);
846 inode->i_nlink = 1;
847 }
848 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
849 if (retval)
850 goto end_unlink;
851 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
852 mark_inode_dirty(dir);
853 inode_dec_link_count(inode);
854 inode->i_ctime = dir->i_ctime;
855 retval = 0;
856
857 end_unlink:
858 if (fibh.sbh != fibh.ebh)
859 brelse(fibh.ebh);
860 brelse(fibh.sbh);
861
862 out:
863 unlock_kernel();
864 return retval;
865 }
866
867 static int udf_symlink(struct inode *dir, struct dentry *dentry,
868 const char *symname)
869 {
870 struct inode *inode;
871 struct pathComponent *pc;
872 char *compstart;
873 struct udf_fileident_bh fibh;
874 struct extent_position epos = {};
875 int eoffset, elen = 0;
876 struct fileIdentDesc *fi;
877 struct fileIdentDesc cfi;
878 char *ea;
879 int err;
880 int block;
881 char *name = NULL;
882 int namelen;
883 struct buffer_head *bh;
884 struct udf_inode_info *iinfo;
885
886 lock_kernel();
887 inode = udf_new_inode(dir, S_IFLNK, &err);
888 if (!inode)
889 goto out;
890
891 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
892 if (!name) {
893 err = -ENOMEM;
894 goto out_no_entry;
895 }
896
897 iinfo = UDF_I(inode);
898 inode->i_mode = S_IFLNK | S_IRWXUGO;
899 inode->i_data.a_ops = &udf_symlink_aops;
900 inode->i_op = &page_symlink_inode_operations;
901
902 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
903 struct kernel_lb_addr eloc;
904 uint32_t bsize;
905
906 block = udf_new_block(inode->i_sb, inode,
907 iinfo->i_location.partitionReferenceNum,
908 iinfo->i_location.logicalBlockNum, &err);
909 if (!block)
910 goto out_no_entry;
911 epos.block = iinfo->i_location;
912 epos.offset = udf_file_entry_alloc_offset(inode);
913 epos.bh = NULL;
914 eloc.logicalBlockNum = block;
915 eloc.partitionReferenceNum =
916 iinfo->i_location.partitionReferenceNum;
917 bsize = inode->i_sb->s_blocksize;
918 iinfo->i_lenExtents = bsize;
919 udf_add_aext(inode, &epos, &eloc, bsize, 0);
920 brelse(epos.bh);
921
922 block = udf_get_pblock(inode->i_sb, block,
923 iinfo->i_location.partitionReferenceNum,
924 0);
925 epos.bh = udf_tread(inode->i_sb, block);
926 lock_buffer(epos.bh);
927 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
928 set_buffer_uptodate(epos.bh);
929 unlock_buffer(epos.bh);
930 mark_buffer_dirty_inode(epos.bh, inode);
931 ea = epos.bh->b_data + udf_ext0_offset(inode);
932 } else
933 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
934
935 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
936 pc = (struct pathComponent *)ea;
937
938 if (*symname == '/') {
939 do {
940 symname++;
941 } while (*symname == '/');
942
943 pc->componentType = 1;
944 pc->lengthComponentIdent = 0;
945 pc->componentFileVersionNum = 0;
946 pc += sizeof(struct pathComponent);
947 elen += sizeof(struct pathComponent);
948 }
949
950 err = -ENAMETOOLONG;
951
952 while (*symname) {
953 if (elen + sizeof(struct pathComponent) > eoffset)
954 goto out_no_entry;
955
956 pc = (struct pathComponent *)(ea + elen);
957
958 compstart = (char *)symname;
959
960 do {
961 symname++;
962 } while (*symname && *symname != '/');
963
964 pc->componentType = 5;
965 pc->lengthComponentIdent = 0;
966 pc->componentFileVersionNum = 0;
967 if (compstart[0] == '.') {
968 if ((symname - compstart) == 1)
969 pc->componentType = 4;
970 else if ((symname - compstart) == 2 &&
971 compstart[1] == '.')
972 pc->componentType = 3;
973 }
974
975 if (pc->componentType == 5) {
976 namelen = udf_put_filename(inode->i_sb, compstart, name,
977 symname - compstart);
978 if (!namelen)
979 goto out_no_entry;
980
981 if (elen + sizeof(struct pathComponent) + namelen >
982 eoffset)
983 goto out_no_entry;
984 else
985 pc->lengthComponentIdent = namelen;
986
987 memcpy(pc->componentIdent, name, namelen);
988 }
989
990 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
991
992 if (*symname) {
993 do {
994 symname++;
995 } while (*symname == '/');
996 }
997 }
998
999 brelse(epos.bh);
1000 inode->i_size = elen;
1001 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1002 iinfo->i_lenAlloc = inode->i_size;
1003 mark_inode_dirty(inode);
1004
1005 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1006 if (!fi)
1007 goto out_no_entry;
1008 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1009 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1010 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1011 if (bh) {
1012 struct logicalVolIntegrityDesc *lvid =
1013 (struct logicalVolIntegrityDesc *)bh->b_data;
1014 struct logicalVolHeaderDesc *lvhd;
1015 uint64_t uniqueID;
1016 lvhd = (struct logicalVolHeaderDesc *)
1017 lvid->logicalVolContentsUse;
1018 uniqueID = le64_to_cpu(lvhd->uniqueID);
1019 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1020 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1021 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1022 uniqueID += 16;
1023 lvhd->uniqueID = cpu_to_le64(uniqueID);
1024 mark_buffer_dirty(bh);
1025 }
1026 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1027 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1028 mark_inode_dirty(dir);
1029 if (fibh.sbh != fibh.ebh)
1030 brelse(fibh.ebh);
1031 brelse(fibh.sbh);
1032 d_instantiate(dentry, inode);
1033 err = 0;
1034
1035 out:
1036 kfree(name);
1037 unlock_kernel();
1038 return err;
1039
1040 out_no_entry:
1041 inode_dec_link_count(inode);
1042 iput(inode);
1043 goto out;
1044 }
1045
1046 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1047 struct dentry *dentry)
1048 {
1049 struct inode *inode = old_dentry->d_inode;
1050 struct udf_fileident_bh fibh;
1051 struct fileIdentDesc cfi, *fi;
1052 int err;
1053 struct buffer_head *bh;
1054
1055 lock_kernel();
1056 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1057 unlock_kernel();
1058 return -EMLINK;
1059 }
1060
1061 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1062 if (!fi) {
1063 unlock_kernel();
1064 return err;
1065 }
1066 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1067 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1068 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1069 if (bh) {
1070 struct logicalVolIntegrityDesc *lvid =
1071 (struct logicalVolIntegrityDesc *)bh->b_data;
1072 struct logicalVolHeaderDesc *lvhd;
1073 uint64_t uniqueID;
1074 lvhd = (struct logicalVolHeaderDesc *)
1075 (lvid->logicalVolContentsUse);
1076 uniqueID = le64_to_cpu(lvhd->uniqueID);
1077 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1078 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1079 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1080 uniqueID += 16;
1081 lvhd->uniqueID = cpu_to_le64(uniqueID);
1082 mark_buffer_dirty(bh);
1083 }
1084 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1085 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1086 mark_inode_dirty(dir);
1087
1088 if (fibh.sbh != fibh.ebh)
1089 brelse(fibh.ebh);
1090 brelse(fibh.sbh);
1091 inc_nlink(inode);
1092 inode->i_ctime = current_fs_time(inode->i_sb);
1093 mark_inode_dirty(inode);
1094 atomic_inc(&inode->i_count);
1095 d_instantiate(dentry, inode);
1096 unlock_kernel();
1097
1098 return 0;
1099 }
1100
1101 /* Anybody can rename anything with this: the permission checks are left to the
1102 * higher-level routines.
1103 */
1104 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1105 struct inode *new_dir, struct dentry *new_dentry)
1106 {
1107 struct inode *old_inode = old_dentry->d_inode;
1108 struct inode *new_inode = new_dentry->d_inode;
1109 struct udf_fileident_bh ofibh, nfibh;
1110 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1111 struct fileIdentDesc ocfi, ncfi;
1112 struct buffer_head *dir_bh = NULL;
1113 int retval = -ENOENT;
1114 struct kernel_lb_addr tloc;
1115 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1116
1117 lock_kernel();
1118 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1119 if (ofi) {
1120 if (ofibh.sbh != ofibh.ebh)
1121 brelse(ofibh.ebh);
1122 brelse(ofibh.sbh);
1123 }
1124 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1125 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1126 != old_inode->i_ino)
1127 goto end_rename;
1128
1129 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1130 if (nfi) {
1131 if (!new_inode) {
1132 if (nfibh.sbh != nfibh.ebh)
1133 brelse(nfibh.ebh);
1134 brelse(nfibh.sbh);
1135 nfi = NULL;
1136 }
1137 }
1138 if (S_ISDIR(old_inode->i_mode)) {
1139 int offset = udf_ext0_offset(old_inode);
1140
1141 if (new_inode) {
1142 retval = -ENOTEMPTY;
1143 if (!empty_dir(new_inode))
1144 goto end_rename;
1145 }
1146 retval = -EIO;
1147 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1148 dir_fi = udf_get_fileident(
1149 old_iinfo->i_ext.i_data -
1150 (old_iinfo->i_efe ?
1151 sizeof(struct extendedFileEntry) :
1152 sizeof(struct fileEntry)),
1153 old_inode->i_sb->s_blocksize, &offset);
1154 } else {
1155 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1156 if (!dir_bh)
1157 goto end_rename;
1158 dir_fi = udf_get_fileident(dir_bh->b_data,
1159 old_inode->i_sb->s_blocksize, &offset);
1160 }
1161 if (!dir_fi)
1162 goto end_rename;
1163 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1164 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1165 old_dir->i_ino)
1166 goto end_rename;
1167
1168 retval = -EMLINK;
1169 if (!new_inode &&
1170 new_dir->i_nlink >=
1171 (256 << sizeof(new_dir->i_nlink)) - 1)
1172 goto end_rename;
1173 }
1174 if (!nfi) {
1175 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1176 &retval);
1177 if (!nfi)
1178 goto end_rename;
1179 }
1180
1181 /*
1182 * Like most other Unix systems, set the ctime for inodes on a
1183 * rename.
1184 */
1185 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1186 mark_inode_dirty(old_inode);
1187
1188 /*
1189 * ok, that's it
1190 */
1191 ncfi.fileVersionNum = ocfi.fileVersionNum;
1192 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1193 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1194 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1195
1196 /* The old fid may have moved - find it again */
1197 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1198 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1199
1200 if (new_inode) {
1201 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1202 inode_dec_link_count(new_inode);
1203 }
1204 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1205 mark_inode_dirty(old_dir);
1206
1207 if (dir_fi) {
1208 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1209 udf_update_tag((char *)dir_fi,
1210 (sizeof(struct fileIdentDesc) +
1211 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1212 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1213 mark_inode_dirty(old_inode);
1214 else
1215 mark_buffer_dirty_inode(dir_bh, old_inode);
1216
1217 inode_dec_link_count(old_dir);
1218 if (new_inode)
1219 inode_dec_link_count(new_inode);
1220 else {
1221 inc_nlink(new_dir);
1222 mark_inode_dirty(new_dir);
1223 }
1224 }
1225
1226 if (ofi) {
1227 if (ofibh.sbh != ofibh.ebh)
1228 brelse(ofibh.ebh);
1229 brelse(ofibh.sbh);
1230 }
1231
1232 retval = 0;
1233
1234 end_rename:
1235 brelse(dir_bh);
1236 if (nfi) {
1237 if (nfibh.sbh != nfibh.ebh)
1238 brelse(nfibh.ebh);
1239 brelse(nfibh.sbh);
1240 }
1241 unlock_kernel();
1242
1243 return retval;
1244 }
1245
1246 static struct dentry *udf_get_parent(struct dentry *child)
1247 {
1248 struct kernel_lb_addr tloc;
1249 struct inode *inode = NULL;
1250 struct qstr dotdot = {.name = "..", .len = 2};
1251 struct fileIdentDesc cfi;
1252 struct udf_fileident_bh fibh;
1253
1254 lock_kernel();
1255 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1256 goto out_unlock;
1257
1258 if (fibh.sbh != fibh.ebh)
1259 brelse(fibh.ebh);
1260 brelse(fibh.sbh);
1261
1262 tloc = lelb_to_cpu(cfi.icb.extLocation);
1263 inode = udf_iget(child->d_inode->i_sb, &tloc);
1264 if (!inode)
1265 goto out_unlock;
1266 unlock_kernel();
1267
1268 return d_obtain_alias(inode);
1269 out_unlock:
1270 unlock_kernel();
1271 return ERR_PTR(-EACCES);
1272 }
1273
1274
1275 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1276 u16 partref, __u32 generation)
1277 {
1278 struct inode *inode;
1279 struct kernel_lb_addr loc;
1280
1281 if (block == 0)
1282 return ERR_PTR(-ESTALE);
1283
1284 loc.logicalBlockNum = block;
1285 loc.partitionReferenceNum = partref;
1286 inode = udf_iget(sb, &loc);
1287
1288 if (inode == NULL)
1289 return ERR_PTR(-ENOMEM);
1290
1291 if (generation && inode->i_generation != generation) {
1292 iput(inode);
1293 return ERR_PTR(-ESTALE);
1294 }
1295 return d_obtain_alias(inode);
1296 }
1297
1298 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1299 struct fid *fid, int fh_len, int fh_type)
1300 {
1301 if ((fh_len != 3 && fh_len != 5) ||
1302 (fh_type != FILEID_UDF_WITH_PARENT &&
1303 fh_type != FILEID_UDF_WITHOUT_PARENT))
1304 return NULL;
1305
1306 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1307 fid->udf.generation);
1308 }
1309
1310 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1311 struct fid *fid, int fh_len, int fh_type)
1312 {
1313 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1314 return NULL;
1315
1316 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1317 fid->udf.parent_partref,
1318 fid->udf.parent_generation);
1319 }
1320 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1321 int connectable)
1322 {
1323 int len = *lenp;
1324 struct inode *inode = de->d_inode;
1325 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1326 struct fid *fid = (struct fid *)fh;
1327 int type = FILEID_UDF_WITHOUT_PARENT;
1328
1329 if (len < 3 || (connectable && len < 5))
1330 return 255;
1331
1332 *lenp = 3;
1333 fid->udf.block = location.logicalBlockNum;
1334 fid->udf.partref = location.partitionReferenceNum;
1335 fid->udf.generation = inode->i_generation;
1336
1337 if (connectable && !S_ISDIR(inode->i_mode)) {
1338 spin_lock(&de->d_lock);
1339 inode = de->d_parent->d_inode;
1340 location = UDF_I(inode)->i_location;
1341 fid->udf.parent_block = location.logicalBlockNum;
1342 fid->udf.parent_partref = location.partitionReferenceNum;
1343 fid->udf.parent_generation = inode->i_generation;
1344 spin_unlock(&de->d_lock);
1345 *lenp = 5;
1346 type = FILEID_UDF_WITH_PARENT;
1347 }
1348
1349 return type;
1350 }
1351
1352 const struct export_operations udf_export_ops = {
1353 .encode_fh = udf_encode_fh,
1354 .fh_to_dentry = udf_fh_to_dentry,
1355 .fh_to_parent = udf_fh_to_parent,
1356 .get_parent = udf_get_parent,
1357 };
1358
1359 const struct inode_operations udf_dir_inode_operations = {
1360 .lookup = udf_lookup,
1361 .create = udf_create,
1362 .link = udf_link,
1363 .unlink = udf_unlink,
1364 .symlink = udf_symlink,
1365 .mkdir = udf_mkdir,
1366 .rmdir = udf_rmdir,
1367 .mknod = udf_mknod,
1368 .rename = udf_rename,
1369 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree