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Merge branch 'slabh' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / namei.c
blob75816025f95f5e8e710e92b48cd9751094d45692
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 unsigned char *name1, int len2,
38 const unsigned char *name2)
39 {
40 if (len1 != len2)
41 return 0;
42
43 return !memcmp(name1, name2, len1);
44 }
45
46 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
47 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
48 uint8_t *impuse, uint8_t *fileident)
49 {
50 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
51 uint16_t crc;
52 int offset;
53 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
54 uint8_t lfi = cfi->lengthFileIdent;
55 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
56 sizeof(struct fileIdentDesc);
57 int adinicb = 0;
58
59 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
60 adinicb = 1;
61
62 offset = fibh->soffset + sizeof(struct fileIdentDesc);
63
64 if (impuse) {
65 if (adinicb || (offset + liu < 0)) {
66 memcpy((uint8_t *)sfi->impUse, impuse, liu);
67 } else if (offset >= 0) {
68 memcpy(fibh->ebh->b_data + offset, impuse, liu);
69 } else {
70 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
71 memcpy(fibh->ebh->b_data, impuse - offset,
72 liu + offset);
73 }
74 }
75
76 offset += liu;
77
78 if (fileident) {
79 if (adinicb || (offset + lfi < 0)) {
80 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
81 } else if (offset >= 0) {
82 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
83 } else {
84 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
85 -offset);
86 memcpy(fibh->ebh->b_data, fileident - offset,
87 lfi + offset);
88 }
89 }
90
91 offset += lfi;
92
93 if (adinicb || (offset + padlen < 0)) {
94 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
95 } else if (offset >= 0) {
96 memset(fibh->ebh->b_data + offset, 0x00, padlen);
97 } else {
98 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
99 memset(fibh->ebh->b_data, 0x00, padlen + offset);
100 }
101
102 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
103 sizeof(struct fileIdentDesc) - sizeof(struct tag));
104
105 if (fibh->sbh == fibh->ebh) {
106 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
107 crclen + sizeof(struct tag) -
108 sizeof(struct fileIdentDesc));
109 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
110 crc = crc_itu_t(crc, fibh->ebh->b_data +
111 sizeof(struct fileIdentDesc) +
112 fibh->soffset,
113 crclen + sizeof(struct tag) -
114 sizeof(struct fileIdentDesc));
115 } else {
116 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
117 -fibh->soffset - sizeof(struct fileIdentDesc));
118 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
119 }
120
121 cfi->descTag.descCRC = cpu_to_le16(crc);
122 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
123 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
124
125 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
127 sizeof(struct fileIdentDesc));
128 } else {
129 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
130 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
131 sizeof(struct fileIdentDesc) + fibh->soffset);
132 }
133
134 if (adinicb) {
135 mark_inode_dirty(inode);
136 } else {
137 if (fibh->sbh != fibh->ebh)
138 mark_buffer_dirty_inode(fibh->ebh, inode);
139 mark_buffer_dirty_inode(fibh->sbh, inode);
140 }
141 return 0;
142 }
143
144 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
145 const struct qstr *child,
146 struct udf_fileident_bh *fibh,
147 struct fileIdentDesc *cfi)
148 {
149 struct fileIdentDesc *fi = NULL;
150 loff_t f_pos;
151 int block, flen;
152 unsigned char *fname = NULL;
153 unsigned char *nameptr;
154 uint8_t lfi;
155 uint16_t liu;
156 loff_t size;
157 struct kernel_lb_addr eloc;
158 uint32_t elen;
159 sector_t offset;
160 struct extent_position epos = {};
161 struct udf_inode_info *dinfo = UDF_I(dir);
162 int isdotdot = child->len == 2 &&
163 child->name[0] == '.' && child->name[1] == '.';
164
165 size = udf_ext0_offset(dir) + dir->i_size;
166 f_pos = udf_ext0_offset(dir);
167
168 fibh->sbh = fibh->ebh = NULL;
169 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
170 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
171 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
172 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
173 goto out_err;
174 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
175 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
176 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
177 epos.offset -= sizeof(struct short_ad);
178 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
179 epos.offset -= sizeof(struct long_ad);
180 } else
181 offset = 0;
182
183 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
184 if (!fibh->sbh)
185 goto out_err;
186 }
187
188 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
189 if (!fname)
190 goto out_err;
191
192 while (f_pos < size) {
193 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
194 &elen, &offset);
195 if (!fi)
196 goto out_err;
197
198 liu = le16_to_cpu(cfi->lengthOfImpUse);
199 lfi = cfi->lengthFileIdent;
200
201 if (fibh->sbh == fibh->ebh) {
202 nameptr = fi->fileIdent + liu;
203 } else {
204 int poffset; /* Unpaded ending offset */
205
206 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
207 liu + lfi;
208
209 if (poffset >= lfi)
210 nameptr = (uint8_t *)(fibh->ebh->b_data +
211 poffset - lfi);
212 else {
213 nameptr = fname;
214 memcpy(nameptr, fi->fileIdent + liu,
215 lfi - poffset);
216 memcpy(nameptr + lfi - poffset,
217 fibh->ebh->b_data, poffset);
218 }
219 }
220
221 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
222 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
223 continue;
224 }
225
226 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
227 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
228 continue;
229 }
230
231 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
232 isdotdot) {
233 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 unsigned 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 dquot_initialize(dir);
567
568 lock_kernel();
569 inode = udf_new_inode(dir, mode, &err);
570 if (!inode) {
571 unlock_kernel();
572 return err;
573 }
574
575 iinfo = UDF_I(inode);
576 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
577 inode->i_data.a_ops = &udf_adinicb_aops;
578 else
579 inode->i_data.a_ops = &udf_aops;
580 inode->i_op = &udf_file_inode_operations;
581 inode->i_fop = &udf_file_operations;
582 inode->i_mode = mode;
583 mark_inode_dirty(inode);
584
585 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
586 if (!fi) {
587 inode->i_nlink--;
588 mark_inode_dirty(inode);
589 iput(inode);
590 unlock_kernel();
591 return err;
592 }
593 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
594 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
595 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
596 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
597 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
598 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
599 mark_inode_dirty(dir);
600 if (fibh.sbh != fibh.ebh)
601 brelse(fibh.ebh);
602 brelse(fibh.sbh);
603 unlock_kernel();
604 d_instantiate(dentry, inode);
605
606 return 0;
607 }
608
609 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
610 dev_t rdev)
611 {
612 struct inode *inode;
613 struct udf_fileident_bh fibh;
614 struct fileIdentDesc cfi, *fi;
615 int err;
616 struct udf_inode_info *iinfo;
617
618 if (!old_valid_dev(rdev))
619 return -EINVAL;
620
621 dquot_initialize(dir);
622
623 lock_kernel();
624 err = -EIO;
625 inode = udf_new_inode(dir, mode, &err);
626 if (!inode)
627 goto out;
628
629 iinfo = UDF_I(inode);
630 inode->i_uid = current_fsuid();
631 init_special_inode(inode, mode, rdev);
632 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
633 if (!fi) {
634 inode->i_nlink--;
635 mark_inode_dirty(inode);
636 iput(inode);
637 unlock_kernel();
638 return err;
639 }
640 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
641 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
642 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
643 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
644 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
645 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
646 mark_inode_dirty(dir);
647 mark_inode_dirty(inode);
648
649 if (fibh.sbh != fibh.ebh)
650 brelse(fibh.ebh);
651 brelse(fibh.sbh);
652 d_instantiate(dentry, inode);
653 err = 0;
654
655 out:
656 unlock_kernel();
657 return err;
658 }
659
660 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
661 {
662 struct inode *inode;
663 struct udf_fileident_bh fibh;
664 struct fileIdentDesc cfi, *fi;
665 int err;
666 struct udf_inode_info *dinfo = UDF_I(dir);
667 struct udf_inode_info *iinfo;
668
669 dquot_initialize(dir);
670
671 lock_kernel();
672 err = -EMLINK;
673 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
674 goto out;
675
676 err = -EIO;
677 inode = udf_new_inode(dir, S_IFDIR, &err);
678 if (!inode)
679 goto out;
680
681 iinfo = UDF_I(inode);
682 inode->i_op = &udf_dir_inode_operations;
683 inode->i_fop = &udf_dir_operations;
684 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
685 if (!fi) {
686 inode->i_nlink--;
687 mark_inode_dirty(inode);
688 iput(inode);
689 goto out;
690 }
691 inode->i_nlink = 2;
692 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
693 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
694 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
695 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
696 cfi.fileCharacteristics =
697 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 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
706 if (!fi) {
707 inode->i_nlink = 0;
708 mark_inode_dirty(inode);
709 iput(inode);
710 goto out;
711 }
712 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
713 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
714 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
715 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
716 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
717 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
718 inc_nlink(dir);
719 mark_inode_dirty(dir);
720 d_instantiate(dentry, inode);
721 if (fibh.sbh != fibh.ebh)
722 brelse(fibh.ebh);
723 brelse(fibh.sbh);
724 err = 0;
725
726 out:
727 unlock_kernel();
728 return err;
729 }
730
731 static int empty_dir(struct inode *dir)
732 {
733 struct fileIdentDesc *fi, cfi;
734 struct udf_fileident_bh fibh;
735 loff_t f_pos;
736 loff_t size = udf_ext0_offset(dir) + dir->i_size;
737 int block;
738 struct kernel_lb_addr eloc;
739 uint32_t elen;
740 sector_t offset;
741 struct extent_position epos = {};
742 struct udf_inode_info *dinfo = UDF_I(dir);
743
744 f_pos = udf_ext0_offset(dir);
745 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
746
747 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
748 fibh.sbh = fibh.ebh = NULL;
749 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
750 &epos, &eloc, &elen, &offset) ==
751 (EXT_RECORDED_ALLOCATED >> 30)) {
752 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
753 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
754 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
755 epos.offset -= sizeof(struct short_ad);
756 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
757 epos.offset -= sizeof(struct long_ad);
758 } else
759 offset = 0;
760
761 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
762 if (!fibh.sbh) {
763 brelse(epos.bh);
764 return 0;
765 }
766 } else {
767 brelse(epos.bh);
768 return 0;
769 }
770
771 while (f_pos < size) {
772 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
773 &elen, &offset);
774 if (!fi) {
775 if (fibh.sbh != fibh.ebh)
776 brelse(fibh.ebh);
777 brelse(fibh.sbh);
778 brelse(epos.bh);
779 return 0;
780 }
781
782 if (cfi.lengthFileIdent &&
783 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
784 if (fibh.sbh != fibh.ebh)
785 brelse(fibh.ebh);
786 brelse(fibh.sbh);
787 brelse(epos.bh);
788 return 0;
789 }
790 }
791
792 if (fibh.sbh != fibh.ebh)
793 brelse(fibh.ebh);
794 brelse(fibh.sbh);
795 brelse(epos.bh);
796
797 return 1;
798 }
799
800 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
801 {
802 int retval;
803 struct inode *inode = dentry->d_inode;
804 struct udf_fileident_bh fibh;
805 struct fileIdentDesc *fi, cfi;
806 struct kernel_lb_addr tloc;
807
808 dquot_initialize(dir);
809
810 retval = -ENOENT;
811 lock_kernel();
812 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
813 if (!fi)
814 goto out;
815
816 retval = -EIO;
817 tloc = lelb_to_cpu(cfi.icb.extLocation);
818 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
819 goto end_rmdir;
820 retval = -ENOTEMPTY;
821 if (!empty_dir(inode))
822 goto end_rmdir;
823 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
824 if (retval)
825 goto end_rmdir;
826 if (inode->i_nlink != 2)
827 udf_warning(inode->i_sb, "udf_rmdir",
828 "empty directory has nlink != 2 (%d)",
829 inode->i_nlink);
830 clear_nlink(inode);
831 inode->i_size = 0;
832 inode_dec_link_count(dir);
833 inode->i_ctime = dir->i_ctime = dir->i_mtime =
834 current_fs_time(dir->i_sb);
835 mark_inode_dirty(dir);
836
837 end_rmdir:
838 if (fibh.sbh != fibh.ebh)
839 brelse(fibh.ebh);
840 brelse(fibh.sbh);
841
842 out:
843 unlock_kernel();
844 return retval;
845 }
846
847 static int udf_unlink(struct inode *dir, struct dentry *dentry)
848 {
849 int retval;
850 struct inode *inode = dentry->d_inode;
851 struct udf_fileident_bh fibh;
852 struct fileIdentDesc *fi;
853 struct fileIdentDesc cfi;
854 struct kernel_lb_addr tloc;
855
856 dquot_initialize(dir);
857
858 retval = -ENOENT;
859 lock_kernel();
860 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
861 if (!fi)
862 goto out;
863
864 retval = -EIO;
865 tloc = lelb_to_cpu(cfi.icb.extLocation);
866 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
867 goto end_unlink;
868
869 if (!inode->i_nlink) {
870 udf_debug("Deleting nonexistent file (%lu), %d\n",
871 inode->i_ino, inode->i_nlink);
872 inode->i_nlink = 1;
873 }
874 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
875 if (retval)
876 goto end_unlink;
877 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
878 mark_inode_dirty(dir);
879 inode_dec_link_count(inode);
880 inode->i_ctime = dir->i_ctime;
881 retval = 0;
882
883 end_unlink:
884 if (fibh.sbh != fibh.ebh)
885 brelse(fibh.ebh);
886 brelse(fibh.sbh);
887
888 out:
889 unlock_kernel();
890 return retval;
891 }
892
893 static int udf_symlink(struct inode *dir, struct dentry *dentry,
894 const char *symname)
895 {
896 struct inode *inode;
897 struct pathComponent *pc;
898 const char *compstart;
899 struct udf_fileident_bh fibh;
900 struct extent_position epos = {};
901 int eoffset, elen = 0;
902 struct fileIdentDesc *fi;
903 struct fileIdentDesc cfi;
904 uint8_t *ea;
905 int err;
906 int block;
907 unsigned char *name = NULL;
908 int namelen;
909 struct buffer_head *bh;
910 struct udf_inode_info *iinfo;
911
912 dquot_initialize(dir);
913
914 lock_kernel();
915 inode = udf_new_inode(dir, S_IFLNK, &err);
916 if (!inode)
917 goto out;
918
919 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
920 if (!name) {
921 err = -ENOMEM;
922 goto out_no_entry;
923 }
924
925 iinfo = UDF_I(inode);
926 inode->i_mode = S_IFLNK | S_IRWXUGO;
927 inode->i_data.a_ops = &udf_symlink_aops;
928 inode->i_op = &udf_symlink_inode_operations;
929
930 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
931 struct kernel_lb_addr eloc;
932 uint32_t bsize;
933
934 block = udf_new_block(inode->i_sb, inode,
935 iinfo->i_location.partitionReferenceNum,
936 iinfo->i_location.logicalBlockNum, &err);
937 if (!block)
938 goto out_no_entry;
939 epos.block = iinfo->i_location;
940 epos.offset = udf_file_entry_alloc_offset(inode);
941 epos.bh = NULL;
942 eloc.logicalBlockNum = block;
943 eloc.partitionReferenceNum =
944 iinfo->i_location.partitionReferenceNum;
945 bsize = inode->i_sb->s_blocksize;
946 iinfo->i_lenExtents = bsize;
947 udf_add_aext(inode, &epos, &eloc, bsize, 0);
948 brelse(epos.bh);
949
950 block = udf_get_pblock(inode->i_sb, block,
951 iinfo->i_location.partitionReferenceNum,
952 0);
953 epos.bh = udf_tgetblk(inode->i_sb, block);
954 lock_buffer(epos.bh);
955 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
956 set_buffer_uptodate(epos.bh);
957 unlock_buffer(epos.bh);
958 mark_buffer_dirty_inode(epos.bh, inode);
959 ea = epos.bh->b_data + udf_ext0_offset(inode);
960 } else
961 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
962
963 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
964 pc = (struct pathComponent *)ea;
965
966 if (*symname == '/') {
967 do {
968 symname++;
969 } while (*symname == '/');
970
971 pc->componentType = 1;
972 pc->lengthComponentIdent = 0;
973 pc->componentFileVersionNum = 0;
974 elen += sizeof(struct pathComponent);
975 }
976
977 err = -ENAMETOOLONG;
978
979 while (*symname) {
980 if (elen + sizeof(struct pathComponent) > eoffset)
981 goto out_no_entry;
982
983 pc = (struct pathComponent *)(ea + elen);
984
985 compstart = symname;
986
987 do {
988 symname++;
989 } while (*symname && *symname != '/');
990
991 pc->componentType = 5;
992 pc->lengthComponentIdent = 0;
993 pc->componentFileVersionNum = 0;
994 if (compstart[0] == '.') {
995 if ((symname - compstart) == 1)
996 pc->componentType = 4;
997 else if ((symname - compstart) == 2 &&
998 compstart[1] == '.')
999 pc->componentType = 3;
1000 }
1001
1002 if (pc->componentType == 5) {
1003 namelen = udf_put_filename(inode->i_sb, compstart, name,
1004 symname - compstart);
1005 if (!namelen)
1006 goto out_no_entry;
1007
1008 if (elen + sizeof(struct pathComponent) + namelen >
1009 eoffset)
1010 goto out_no_entry;
1011 else
1012 pc->lengthComponentIdent = namelen;
1013
1014 memcpy(pc->componentIdent, name, namelen);
1015 }
1016
1017 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1018
1019 if (*symname) {
1020 do {
1021 symname++;
1022 } while (*symname == '/');
1023 }
1024 }
1025
1026 brelse(epos.bh);
1027 inode->i_size = elen;
1028 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1029 iinfo->i_lenAlloc = inode->i_size;
1030 else
1031 udf_truncate_tail_extent(inode);
1032 mark_inode_dirty(inode);
1033
1034 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1035 if (!fi)
1036 goto out_no_entry;
1037 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1038 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1039 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1040 if (bh) {
1041 struct logicalVolIntegrityDesc *lvid =
1042 (struct logicalVolIntegrityDesc *)bh->b_data;
1043 struct logicalVolHeaderDesc *lvhd;
1044 uint64_t uniqueID;
1045 lvhd = (struct logicalVolHeaderDesc *)
1046 lvid->logicalVolContentsUse;
1047 uniqueID = le64_to_cpu(lvhd->uniqueID);
1048 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1049 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1050 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1051 uniqueID += 16;
1052 lvhd->uniqueID = cpu_to_le64(uniqueID);
1053 mark_buffer_dirty(bh);
1054 }
1055 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1056 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1057 mark_inode_dirty(dir);
1058 if (fibh.sbh != fibh.ebh)
1059 brelse(fibh.ebh);
1060 brelse(fibh.sbh);
1061 d_instantiate(dentry, inode);
1062 err = 0;
1063
1064 out:
1065 kfree(name);
1066 unlock_kernel();
1067 return err;
1068
1069 out_no_entry:
1070 inode_dec_link_count(inode);
1071 iput(inode);
1072 goto out;
1073 }
1074
1075 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1076 struct dentry *dentry)
1077 {
1078 struct inode *inode = old_dentry->d_inode;
1079 struct udf_fileident_bh fibh;
1080 struct fileIdentDesc cfi, *fi;
1081 int err;
1082 struct buffer_head *bh;
1083
1084 dquot_initialize(dir);
1085
1086 lock_kernel();
1087 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1088 unlock_kernel();
1089 return -EMLINK;
1090 }
1091
1092 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1093 if (!fi) {
1094 unlock_kernel();
1095 return err;
1096 }
1097 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1098 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1099 bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1100 if (bh) {
1101 struct logicalVolIntegrityDesc *lvid =
1102 (struct logicalVolIntegrityDesc *)bh->b_data;
1103 struct logicalVolHeaderDesc *lvhd;
1104 uint64_t uniqueID;
1105 lvhd = (struct logicalVolHeaderDesc *)
1106 (lvid->logicalVolContentsUse);
1107 uniqueID = le64_to_cpu(lvhd->uniqueID);
1108 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1109 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1110 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1111 uniqueID += 16;
1112 lvhd->uniqueID = cpu_to_le64(uniqueID);
1113 mark_buffer_dirty(bh);
1114 }
1115 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1116 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1117 mark_inode_dirty(dir);
1118
1119 if (fibh.sbh != fibh.ebh)
1120 brelse(fibh.ebh);
1121 brelse(fibh.sbh);
1122 inc_nlink(inode);
1123 inode->i_ctime = current_fs_time(inode->i_sb);
1124 mark_inode_dirty(inode);
1125 atomic_inc(&inode->i_count);
1126 d_instantiate(dentry, inode);
1127 unlock_kernel();
1128
1129 return 0;
1130 }
1131
1132 /* Anybody can rename anything with this: the permission checks are left to the
1133 * higher-level routines.
1134 */
1135 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1136 struct inode *new_dir, struct dentry *new_dentry)
1137 {
1138 struct inode *old_inode = old_dentry->d_inode;
1139 struct inode *new_inode = new_dentry->d_inode;
1140 struct udf_fileident_bh ofibh, nfibh;
1141 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1142 struct fileIdentDesc ocfi, ncfi;
1143 struct buffer_head *dir_bh = NULL;
1144 int retval = -ENOENT;
1145 struct kernel_lb_addr tloc;
1146 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1147
1148 dquot_initialize(old_dir);
1149 dquot_initialize(new_dir);
1150
1151 lock_kernel();
1152 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1153 if (ofi) {
1154 if (ofibh.sbh != ofibh.ebh)
1155 brelse(ofibh.ebh);
1156 brelse(ofibh.sbh);
1157 }
1158 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1159 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1160 != old_inode->i_ino)
1161 goto end_rename;
1162
1163 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1164 if (nfi) {
1165 if (!new_inode) {
1166 if (nfibh.sbh != nfibh.ebh)
1167 brelse(nfibh.ebh);
1168 brelse(nfibh.sbh);
1169 nfi = NULL;
1170 }
1171 }
1172 if (S_ISDIR(old_inode->i_mode)) {
1173 int offset = udf_ext0_offset(old_inode);
1174
1175 if (new_inode) {
1176 retval = -ENOTEMPTY;
1177 if (!empty_dir(new_inode))
1178 goto end_rename;
1179 }
1180 retval = -EIO;
1181 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1182 dir_fi = udf_get_fileident(
1183 old_iinfo->i_ext.i_data -
1184 (old_iinfo->i_efe ?
1185 sizeof(struct extendedFileEntry) :
1186 sizeof(struct fileEntry)),
1187 old_inode->i_sb->s_blocksize, &offset);
1188 } else {
1189 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1190 if (!dir_bh)
1191 goto end_rename;
1192 dir_fi = udf_get_fileident(dir_bh->b_data,
1193 old_inode->i_sb->s_blocksize, &offset);
1194 }
1195 if (!dir_fi)
1196 goto end_rename;
1197 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1198 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1199 old_dir->i_ino)
1200 goto end_rename;
1201
1202 retval = -EMLINK;
1203 if (!new_inode &&
1204 new_dir->i_nlink >=
1205 (256 << sizeof(new_dir->i_nlink)) - 1)
1206 goto end_rename;
1207 }
1208 if (!nfi) {
1209 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1210 &retval);
1211 if (!nfi)
1212 goto end_rename;
1213 }
1214
1215 /*
1216 * Like most other Unix systems, set the ctime for inodes on a
1217 * rename.
1218 */
1219 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1220 mark_inode_dirty(old_inode);
1221
1222 /*
1223 * ok, that's it
1224 */
1225 ncfi.fileVersionNum = ocfi.fileVersionNum;
1226 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1227 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1228 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1229
1230 /* The old fid may have moved - find it again */
1231 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1232 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1233
1234 if (new_inode) {
1235 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1236 inode_dec_link_count(new_inode);
1237 }
1238 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1239 mark_inode_dirty(old_dir);
1240
1241 if (dir_fi) {
1242 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1243 udf_update_tag((char *)dir_fi,
1244 (sizeof(struct fileIdentDesc) +
1245 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1246 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1247 mark_inode_dirty(old_inode);
1248 else
1249 mark_buffer_dirty_inode(dir_bh, old_inode);
1250
1251 inode_dec_link_count(old_dir);
1252 if (new_inode)
1253 inode_dec_link_count(new_inode);
1254 else {
1255 inc_nlink(new_dir);
1256 mark_inode_dirty(new_dir);
1257 }
1258 }
1259
1260 if (ofi) {
1261 if (ofibh.sbh != ofibh.ebh)
1262 brelse(ofibh.ebh);
1263 brelse(ofibh.sbh);
1264 }
1265
1266 retval = 0;
1267
1268 end_rename:
1269 brelse(dir_bh);
1270 if (nfi) {
1271 if (nfibh.sbh != nfibh.ebh)
1272 brelse(nfibh.ebh);
1273 brelse(nfibh.sbh);
1274 }
1275 unlock_kernel();
1276
1277 return retval;
1278 }
1279
1280 static struct dentry *udf_get_parent(struct dentry *child)
1281 {
1282 struct kernel_lb_addr tloc;
1283 struct inode *inode = NULL;
1284 struct qstr dotdot = {.name = "..", .len = 2};
1285 struct fileIdentDesc cfi;
1286 struct udf_fileident_bh fibh;
1287
1288 lock_kernel();
1289 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1290 goto out_unlock;
1291
1292 if (fibh.sbh != fibh.ebh)
1293 brelse(fibh.ebh);
1294 brelse(fibh.sbh);
1295
1296 tloc = lelb_to_cpu(cfi.icb.extLocation);
1297 inode = udf_iget(child->d_inode->i_sb, &tloc);
1298 if (!inode)
1299 goto out_unlock;
1300 unlock_kernel();
1301
1302 return d_obtain_alias(inode);
1303 out_unlock:
1304 unlock_kernel();
1305 return ERR_PTR(-EACCES);
1306 }
1307
1308
1309 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1310 u16 partref, __u32 generation)
1311 {
1312 struct inode *inode;
1313 struct kernel_lb_addr loc;
1314
1315 if (block == 0)
1316 return ERR_PTR(-ESTALE);
1317
1318 loc.logicalBlockNum = block;
1319 loc.partitionReferenceNum = partref;
1320 inode = udf_iget(sb, &loc);
1321
1322 if (inode == NULL)
1323 return ERR_PTR(-ENOMEM);
1324
1325 if (generation && inode->i_generation != generation) {
1326 iput(inode);
1327 return ERR_PTR(-ESTALE);
1328 }
1329 return d_obtain_alias(inode);
1330 }
1331
1332 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1333 struct fid *fid, int fh_len, int fh_type)
1334 {
1335 if ((fh_len != 3 && fh_len != 5) ||
1336 (fh_type != FILEID_UDF_WITH_PARENT &&
1337 fh_type != FILEID_UDF_WITHOUT_PARENT))
1338 return NULL;
1339
1340 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1341 fid->udf.generation);
1342 }
1343
1344 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1345 struct fid *fid, int fh_len, int fh_type)
1346 {
1347 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1348 return NULL;
1349
1350 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1351 fid->udf.parent_partref,
1352 fid->udf.parent_generation);
1353 }
1354 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1355 int connectable)
1356 {
1357 int len = *lenp;
1358 struct inode *inode = de->d_inode;
1359 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1360 struct fid *fid = (struct fid *)fh;
1361 int type = FILEID_UDF_WITHOUT_PARENT;
1362
1363 if (len < 3 || (connectable && len < 5))
1364 return 255;
1365
1366 *lenp = 3;
1367 fid->udf.block = location.logicalBlockNum;
1368 fid->udf.partref = location.partitionReferenceNum;
1369 fid->udf.generation = inode->i_generation;
1370
1371 if (connectable && !S_ISDIR(inode->i_mode)) {
1372 spin_lock(&de->d_lock);
1373 inode = de->d_parent->d_inode;
1374 location = UDF_I(inode)->i_location;
1375 fid->udf.parent_block = location.logicalBlockNum;
1376 fid->udf.parent_partref = location.partitionReferenceNum;
1377 fid->udf.parent_generation = inode->i_generation;
1378 spin_unlock(&de->d_lock);
1379 *lenp = 5;
1380 type = FILEID_UDF_WITH_PARENT;
1381 }
1382
1383 return type;
1384 }
1385
1386 const struct export_operations udf_export_ops = {
1387 .encode_fh = udf_encode_fh,
1388 .fh_to_dentry = udf_fh_to_dentry,
1389 .fh_to_parent = udf_fh_to_parent,
1390 .get_parent = udf_get_parent,
1391 };
1392
1393 const struct inode_operations udf_dir_inode_operations = {
1394 .lookup = udf_lookup,
1395 .create = udf_create,
1396 .setattr = udf_setattr,
1397 .link = udf_link,
1398 .unlink = udf_unlink,
1399 .symlink = udf_symlink,
1400 .mkdir = udf_mkdir,
1401 .rmdir = udf_rmdir,
1402 .mknod = udf_mknod,
1403 .rename = udf_rename,
1404 };
1405 const struct inode_operations udf_symlink_inode_operations = {
1406 .readlink = generic_readlink,
1407 .follow_link = page_follow_link_light,
1408 .put_link = page_put_link,
1409 .setattr = udf_setattr,
1410 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree