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udf: Move handling of uniqueID into a helper function and protect it by a s_alloc_mutex
[deliverable/linux.git] / fs / udf / namei.c
1 /*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
15 *
16 * HISTORY
17 *
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
20 */
21
22 #include "udfdecl.h"
23
24 #include "udf_i.h"
25 #include "udf_sb.h"
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/sched.h>
33 #include <linux/crc-itu-t.h>
34 #include <linux/exportfs.h>
35
36 static inline int udf_match(int len1, const unsigned char *name1, int len2,
37 const unsigned char *name2)
38 {
39 if (len1 != len2)
40 return 0;
41
42 return !memcmp(name1, name2, len1);
43 }
44
45 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
46 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
47 uint8_t *impuse, uint8_t *fileident)
48 {
49 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
50 uint16_t crc;
51 int offset;
52 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
53 uint8_t lfi = cfi->lengthFileIdent;
54 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
55 sizeof(struct fileIdentDesc);
56 int adinicb = 0;
57
58 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
59 adinicb = 1;
60
61 offset = fibh->soffset + sizeof(struct fileIdentDesc);
62
63 if (impuse) {
64 if (adinicb || (offset + liu < 0)) {
65 memcpy((uint8_t *)sfi->impUse, impuse, liu);
66 } else if (offset >= 0) {
67 memcpy(fibh->ebh->b_data + offset, impuse, liu);
68 } else {
69 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
70 memcpy(fibh->ebh->b_data, impuse - offset,
71 liu + offset);
72 }
73 }
74
75 offset += liu;
76
77 if (fileident) {
78 if (adinicb || (offset + lfi < 0)) {
79 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
80 } else if (offset >= 0) {
81 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
82 } else {
83 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
84 -offset);
85 memcpy(fibh->ebh->b_data, fileident - offset,
86 lfi + offset);
87 }
88 }
89
90 offset += lfi;
91
92 if (adinicb || (offset + padlen < 0)) {
93 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
94 } else if (offset >= 0) {
95 memset(fibh->ebh->b_data + offset, 0x00, padlen);
96 } else {
97 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
98 memset(fibh->ebh->b_data, 0x00, padlen + offset);
99 }
100
101 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
102 sizeof(struct fileIdentDesc) - sizeof(struct tag));
103
104 if (fibh->sbh == fibh->ebh) {
105 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
106 crclen + sizeof(struct tag) -
107 sizeof(struct fileIdentDesc));
108 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
109 crc = crc_itu_t(crc, fibh->ebh->b_data +
110 sizeof(struct fileIdentDesc) +
111 fibh->soffset,
112 crclen + sizeof(struct tag) -
113 sizeof(struct fileIdentDesc));
114 } else {
115 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
116 -fibh->soffset - sizeof(struct fileIdentDesc));
117 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
118 }
119
120 cfi->descTag.descCRC = cpu_to_le16(crc);
121 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
122 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
123
124 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
125 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
126 sizeof(struct fileIdentDesc));
127 } else {
128 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
129 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
130 sizeof(struct fileIdentDesc) + fibh->soffset);
131 }
132
133 if (adinicb) {
134 mark_inode_dirty(inode);
135 } else {
136 if (fibh->sbh != fibh->ebh)
137 mark_buffer_dirty_inode(fibh->ebh, inode);
138 mark_buffer_dirty_inode(fibh->sbh, inode);
139 }
140 return 0;
141 }
142
143 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
144 const struct qstr *child,
145 struct udf_fileident_bh *fibh,
146 struct fileIdentDesc *cfi)
147 {
148 struct fileIdentDesc *fi = NULL;
149 loff_t f_pos;
150 int block, flen;
151 unsigned char *fname = NULL;
152 unsigned char *nameptr;
153 uint8_t lfi;
154 uint16_t liu;
155 loff_t size;
156 struct kernel_lb_addr eloc;
157 uint32_t elen;
158 sector_t offset;
159 struct extent_position epos = {};
160 struct udf_inode_info *dinfo = UDF_I(dir);
161 int isdotdot = child->len == 2 &&
162 child->name[0] == '.' && child->name[1] == '.';
163
164 size = udf_ext0_offset(dir) + dir->i_size;
165 f_pos = udf_ext0_offset(dir);
166
167 fibh->sbh = fibh->ebh = NULL;
168 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
169 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
170 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
171 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
172 goto out_err;
173 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
174 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
175 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
176 epos.offset -= sizeof(struct short_ad);
177 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
178 epos.offset -= sizeof(struct long_ad);
179 } else
180 offset = 0;
181
182 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
183 if (!fibh->sbh)
184 goto out_err;
185 }
186
187 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
188 if (!fname)
189 goto out_err;
190
191 while (f_pos < size) {
192 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
193 &elen, &offset);
194 if (!fi)
195 goto out_err;
196
197 liu = le16_to_cpu(cfi->lengthOfImpUse);
198 lfi = cfi->lengthFileIdent;
199
200 if (fibh->sbh == fibh->ebh) {
201 nameptr = fi->fileIdent + liu;
202 } else {
203 int poffset; /* Unpaded ending offset */
204
205 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
206 liu + lfi;
207
208 if (poffset >= lfi)
209 nameptr = (uint8_t *)(fibh->ebh->b_data +
210 poffset - lfi);
211 else {
212 nameptr = fname;
213 memcpy(nameptr, fi->fileIdent + liu,
214 lfi - poffset);
215 memcpy(nameptr + lfi - poffset,
216 fibh->ebh->b_data, poffset);
217 }
218 }
219
220 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
221 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
222 continue;
223 }
224
225 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
226 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
227 continue;
228 }
229
230 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
231 isdotdot) {
232 brelse(epos.bh);
233 return fi;
234 }
235
236 if (!lfi)
237 continue;
238
239 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
240 if (flen && udf_match(flen, fname, child->len, child->name))
241 goto out_ok;
242 }
243
244 out_err:
245 fi = NULL;
246 if (fibh->sbh != fibh->ebh)
247 brelse(fibh->ebh);
248 brelse(fibh->sbh);
249 out_ok:
250 brelse(epos.bh);
251 kfree(fname);
252
253 return fi;
254 }
255
256 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
257 struct nameidata *nd)
258 {
259 struct inode *inode = NULL;
260 struct fileIdentDesc cfi;
261 struct udf_fileident_bh fibh;
262
263 if (dentry->d_name.len > UDF_NAME_LEN - 2)
264 return ERR_PTR(-ENAMETOOLONG);
265
266 lock_kernel();
267 #ifdef UDF_RECOVERY
268 /* temporary shorthand for specifying files by inode number */
269 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
270 struct kernel_lb_addr lb = {
271 .logicalBlockNum = 0,
272 .partitionReferenceNum =
273 simple_strtoul(dentry->d_name.name + 3,
274 NULL, 0),
275 };
276 inode = udf_iget(dir->i_sb, lb);
277 if (!inode) {
278 unlock_kernel();
279 return ERR_PTR(-EACCES);
280 }
281 } else
282 #endif /* UDF_RECOVERY */
283
284 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
285 struct kernel_lb_addr loc;
286
287 if (fibh.sbh != fibh.ebh)
288 brelse(fibh.ebh);
289 brelse(fibh.sbh);
290
291 loc = lelb_to_cpu(cfi.icb.extLocation);
292 inode = udf_iget(dir->i_sb, &loc);
293 if (!inode) {
294 unlock_kernel();
295 return ERR_PTR(-EACCES);
296 }
297 }
298 unlock_kernel();
299
300 return d_splice_alias(inode, dentry);
301 }
302
303 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
304 struct dentry *dentry,
305 struct udf_fileident_bh *fibh,
306 struct fileIdentDesc *cfi, int *err)
307 {
308 struct super_block *sb = dir->i_sb;
309 struct fileIdentDesc *fi = NULL;
310 unsigned char *name = NULL;
311 int namelen;
312 loff_t f_pos;
313 loff_t size = udf_ext0_offset(dir) + dir->i_size;
314 int nfidlen;
315 uint8_t lfi;
316 uint16_t liu;
317 int block;
318 struct kernel_lb_addr eloc;
319 uint32_t elen = 0;
320 sector_t offset;
321 struct extent_position epos = {};
322 struct udf_inode_info *dinfo;
323
324 fibh->sbh = fibh->ebh = NULL;
325 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
326 if (!name) {
327 *err = -ENOMEM;
328 goto out_err;
329 }
330
331 if (dentry) {
332 if (!dentry->d_name.len) {
333 *err = -EINVAL;
334 goto out_err;
335 }
336 namelen = udf_put_filename(sb, dentry->d_name.name, name,
337 dentry->d_name.len);
338 if (!namelen) {
339 *err = -ENAMETOOLONG;
340 goto out_err;
341 }
342 } else {
343 namelen = 0;
344 }
345
346 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
347
348 f_pos = udf_ext0_offset(dir);
349
350 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
351 dinfo = UDF_I(dir);
352 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
353 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
354 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
355 block = udf_get_lb_pblock(dir->i_sb,
356 &dinfo->i_location, 0);
357 fibh->soffset = fibh->eoffset = sb->s_blocksize;
358 goto add;
359 }
360 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
361 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
362 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
363 epos.offset -= sizeof(struct short_ad);
364 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
365 epos.offset -= sizeof(struct long_ad);
366 } else
367 offset = 0;
368
369 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
370 if (!fibh->sbh) {
371 *err = -EIO;
372 goto out_err;
373 }
374
375 block = dinfo->i_location.logicalBlockNum;
376 }
377
378 while (f_pos < size) {
379 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
380 &elen, &offset);
381
382 if (!fi) {
383 *err = -EIO;
384 goto out_err;
385 }
386
387 liu = le16_to_cpu(cfi->lengthOfImpUse);
388 lfi = cfi->lengthFileIdent;
389
390 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
391 if (((sizeof(struct fileIdentDesc) +
392 liu + lfi + 3) & ~3) == nfidlen) {
393 cfi->descTag.tagSerialNum = cpu_to_le16(1);
394 cfi->fileVersionNum = cpu_to_le16(1);
395 cfi->fileCharacteristics = 0;
396 cfi->lengthFileIdent = namelen;
397 cfi->lengthOfImpUse = cpu_to_le16(0);
398 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
399 name))
400 goto out_ok;
401 else {
402 *err = -EIO;
403 goto out_err;
404 }
405 }
406 }
407 }
408
409 add:
410 f_pos += nfidlen;
411
412 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
413 sb->s_blocksize - fibh->eoffset < nfidlen) {
414 brelse(epos.bh);
415 epos.bh = NULL;
416 fibh->soffset -= udf_ext0_offset(dir);
417 fibh->eoffset -= udf_ext0_offset(dir);
418 f_pos -= udf_ext0_offset(dir);
419 if (fibh->sbh != fibh->ebh)
420 brelse(fibh->ebh);
421 brelse(fibh->sbh);
422 fibh->sbh = fibh->ebh =
423 udf_expand_dir_adinicb(dir, &block, err);
424 if (!fibh->sbh)
425 goto out_err;
426 epos.block = dinfo->i_location;
427 epos.offset = udf_file_entry_alloc_offset(dir);
428 /* Load extent udf_expand_dir_adinicb() has created */
429 udf_current_aext(dir, &epos, &eloc, &elen, 1);
430 }
431
432 /* Entry fits into current block? */
433 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
434 fibh->soffset = fibh->eoffset;
435 fibh->eoffset += nfidlen;
436 if (fibh->sbh != fibh->ebh) {
437 brelse(fibh->sbh);
438 fibh->sbh = fibh->ebh;
439 }
440
441 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
442 block = dinfo->i_location.logicalBlockNum;
443 fi = (struct fileIdentDesc *)
444 (dinfo->i_ext.i_data +
445 fibh->soffset -
446 udf_ext0_offset(dir) +
447 dinfo->i_lenEAttr);
448 } else {
449 block = eloc.logicalBlockNum +
450 ((elen - 1) >>
451 dir->i_sb->s_blocksize_bits);
452 fi = (struct fileIdentDesc *)
453 (fibh->sbh->b_data + fibh->soffset);
454 }
455 } else {
456 /* Round up last extent in the file */
457 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
458 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
459 epos.offset -= sizeof(struct short_ad);
460 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
461 epos.offset -= sizeof(struct long_ad);
462 udf_write_aext(dir, &epos, &eloc, elen, 1);
463 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
464 - 1) & ~(sb->s_blocksize - 1);
465
466 fibh->soffset = fibh->eoffset - sb->s_blocksize;
467 fibh->eoffset += nfidlen - sb->s_blocksize;
468 if (fibh->sbh != fibh->ebh) {
469 brelse(fibh->sbh);
470 fibh->sbh = fibh->ebh;
471 }
472
473 block = eloc.logicalBlockNum + ((elen - 1) >>
474 dir->i_sb->s_blocksize_bits);
475 fibh->ebh = udf_bread(dir,
476 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
477 if (!fibh->ebh)
478 goto out_err;
479
480 if (!fibh->soffset) {
481 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
482 (EXT_RECORDED_ALLOCATED >> 30)) {
483 block = eloc.logicalBlockNum + ((elen - 1) >>
484 dir->i_sb->s_blocksize_bits);
485 } else
486 block++;
487
488 brelse(fibh->sbh);
489 fibh->sbh = fibh->ebh;
490 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
491 } else {
492 fi = (struct fileIdentDesc *)
493 (fibh->sbh->b_data + sb->s_blocksize +
494 fibh->soffset);
495 }
496 }
497
498 memset(cfi, 0, sizeof(struct fileIdentDesc));
499 if (UDF_SB(sb)->s_udfrev >= 0x0200)
500 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
501 sizeof(struct tag));
502 else
503 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
504 sizeof(struct tag));
505 cfi->fileVersionNum = cpu_to_le16(1);
506 cfi->lengthFileIdent = namelen;
507 cfi->lengthOfImpUse = cpu_to_le16(0);
508 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
509 dir->i_size += nfidlen;
510 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
511 dinfo->i_lenAlloc += nfidlen;
512 else {
513 /* Find the last extent and truncate it to proper size */
514 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
515 (EXT_RECORDED_ALLOCATED >> 30))
516 ;
517 elen -= dinfo->i_lenExtents - dir->i_size;
518 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
519 epos.offset -= sizeof(struct short_ad);
520 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
521 epos.offset -= sizeof(struct long_ad);
522 udf_write_aext(dir, &epos, &eloc, elen, 1);
523 dinfo->i_lenExtents = dir->i_size;
524 }
525
526 mark_inode_dirty(dir);
527 goto out_ok;
528 } else {
529 *err = -EIO;
530 goto out_err;
531 }
532
533 out_err:
534 fi = NULL;
535 if (fibh->sbh != fibh->ebh)
536 brelse(fibh->ebh);
537 brelse(fibh->sbh);
538 out_ok:
539 brelse(epos.bh);
540 kfree(name);
541 return fi;
542 }
543
544 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
545 struct udf_fileident_bh *fibh,
546 struct fileIdentDesc *cfi)
547 {
548 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
549
550 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
551 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
552
553 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
554 }
555
556 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
557 struct nameidata *nd)
558 {
559 struct udf_fileident_bh fibh;
560 struct inode *inode;
561 struct fileIdentDesc cfi, *fi;
562 int err;
563 struct udf_inode_info *iinfo;
564
565 lock_kernel();
566 inode = udf_new_inode(dir, mode, &err);
567 if (!inode) {
568 unlock_kernel();
569 return err;
570 }
571
572 iinfo = UDF_I(inode);
573 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
574 inode->i_data.a_ops = &udf_adinicb_aops;
575 else
576 inode->i_data.a_ops = &udf_aops;
577 inode->i_op = &udf_file_inode_operations;
578 inode->i_fop = &udf_file_operations;
579 mark_inode_dirty(inode);
580
581 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
582 if (!fi) {
583 inode->i_nlink--;
584 mark_inode_dirty(inode);
585 iput(inode);
586 unlock_kernel();
587 return err;
588 }
589 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
590 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
591 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
592 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
593 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
594 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
595 mark_inode_dirty(dir);
596 if (fibh.sbh != fibh.ebh)
597 brelse(fibh.ebh);
598 brelse(fibh.sbh);
599 unlock_kernel();
600 d_instantiate(dentry, inode);
601
602 return 0;
603 }
604
605 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
606 dev_t rdev)
607 {
608 struct inode *inode;
609 struct udf_fileident_bh fibh;
610 struct fileIdentDesc cfi, *fi;
611 int err;
612 struct udf_inode_info *iinfo;
613
614 if (!old_valid_dev(rdev))
615 return -EINVAL;
616
617 lock_kernel();
618 err = -EIO;
619 inode = udf_new_inode(dir, mode, &err);
620 if (!inode)
621 goto out;
622
623 iinfo = UDF_I(inode);
624 init_special_inode(inode, mode, rdev);
625 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
626 if (!fi) {
627 inode->i_nlink--;
628 mark_inode_dirty(inode);
629 iput(inode);
630 unlock_kernel();
631 return err;
632 }
633 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
634 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
635 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
636 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
637 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
638 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
639 mark_inode_dirty(dir);
640 mark_inode_dirty(inode);
641
642 if (fibh.sbh != fibh.ebh)
643 brelse(fibh.ebh);
644 brelse(fibh.sbh);
645 d_instantiate(dentry, inode);
646 err = 0;
647
648 out:
649 unlock_kernel();
650 return err;
651 }
652
653 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
654 {
655 struct inode *inode;
656 struct udf_fileident_bh fibh;
657 struct fileIdentDesc cfi, *fi;
658 int err;
659 struct udf_inode_info *dinfo = UDF_I(dir);
660 struct udf_inode_info *iinfo;
661
662 lock_kernel();
663 err = -EMLINK;
664 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
665 goto out;
666
667 err = -EIO;
668 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
669 if (!inode)
670 goto out;
671
672 iinfo = UDF_I(inode);
673 inode->i_op = &udf_dir_inode_operations;
674 inode->i_fop = &udf_dir_operations;
675 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
676 if (!fi) {
677 inode->i_nlink--;
678 mark_inode_dirty(inode);
679 iput(inode);
680 goto out;
681 }
682 inode->i_nlink = 2;
683 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
684 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
685 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
686 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
687 cfi.fileCharacteristics =
688 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
689 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
690 brelse(fibh.sbh);
691 mark_inode_dirty(inode);
692
693 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
694 if (!fi) {
695 inode->i_nlink = 0;
696 mark_inode_dirty(inode);
697 iput(inode);
698 goto out;
699 }
700 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
701 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
702 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
703 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
704 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
705 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
706 inc_nlink(dir);
707 mark_inode_dirty(dir);
708 d_instantiate(dentry, inode);
709 if (fibh.sbh != fibh.ebh)
710 brelse(fibh.ebh);
711 brelse(fibh.sbh);
712 err = 0;
713
714 out:
715 unlock_kernel();
716 return err;
717 }
718
719 static int empty_dir(struct inode *dir)
720 {
721 struct fileIdentDesc *fi, cfi;
722 struct udf_fileident_bh fibh;
723 loff_t f_pos;
724 loff_t size = udf_ext0_offset(dir) + dir->i_size;
725 int block;
726 struct kernel_lb_addr eloc;
727 uint32_t elen;
728 sector_t offset;
729 struct extent_position epos = {};
730 struct udf_inode_info *dinfo = UDF_I(dir);
731
732 f_pos = udf_ext0_offset(dir);
733 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
734
735 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
736 fibh.sbh = fibh.ebh = NULL;
737 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
738 &epos, &eloc, &elen, &offset) ==
739 (EXT_RECORDED_ALLOCATED >> 30)) {
740 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
741 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
742 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
743 epos.offset -= sizeof(struct short_ad);
744 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
745 epos.offset -= sizeof(struct long_ad);
746 } else
747 offset = 0;
748
749 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
750 if (!fibh.sbh) {
751 brelse(epos.bh);
752 return 0;
753 }
754 } else {
755 brelse(epos.bh);
756 return 0;
757 }
758
759 while (f_pos < size) {
760 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
761 &elen, &offset);
762 if (!fi) {
763 if (fibh.sbh != fibh.ebh)
764 brelse(fibh.ebh);
765 brelse(fibh.sbh);
766 brelse(epos.bh);
767 return 0;
768 }
769
770 if (cfi.lengthFileIdent &&
771 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
772 if (fibh.sbh != fibh.ebh)
773 brelse(fibh.ebh);
774 brelse(fibh.sbh);
775 brelse(epos.bh);
776 return 0;
777 }
778 }
779
780 if (fibh.sbh != fibh.ebh)
781 brelse(fibh.ebh);
782 brelse(fibh.sbh);
783 brelse(epos.bh);
784
785 return 1;
786 }
787
788 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
789 {
790 int retval;
791 struct inode *inode = dentry->d_inode;
792 struct udf_fileident_bh fibh;
793 struct fileIdentDesc *fi, cfi;
794 struct kernel_lb_addr tloc;
795
796 retval = -ENOENT;
797 lock_kernel();
798 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
799 if (!fi)
800 goto out;
801
802 retval = -EIO;
803 tloc = lelb_to_cpu(cfi.icb.extLocation);
804 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
805 goto end_rmdir;
806 retval = -ENOTEMPTY;
807 if (!empty_dir(inode))
808 goto end_rmdir;
809 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
810 if (retval)
811 goto end_rmdir;
812 if (inode->i_nlink != 2)
813 udf_warning(inode->i_sb, "udf_rmdir",
814 "empty directory has nlink != 2 (%d)",
815 inode->i_nlink);
816 clear_nlink(inode);
817 inode->i_size = 0;
818 inode_dec_link_count(dir);
819 inode->i_ctime = dir->i_ctime = dir->i_mtime =
820 current_fs_time(dir->i_sb);
821 mark_inode_dirty(dir);
822
823 end_rmdir:
824 if (fibh.sbh != fibh.ebh)
825 brelse(fibh.ebh);
826 brelse(fibh.sbh);
827
828 out:
829 unlock_kernel();
830 return retval;
831 }
832
833 static int udf_unlink(struct inode *dir, struct dentry *dentry)
834 {
835 int retval;
836 struct inode *inode = dentry->d_inode;
837 struct udf_fileident_bh fibh;
838 struct fileIdentDesc *fi;
839 struct fileIdentDesc cfi;
840 struct kernel_lb_addr tloc;
841
842 retval = -ENOENT;
843 lock_kernel();
844 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
845 if (!fi)
846 goto out;
847
848 retval = -EIO;
849 tloc = lelb_to_cpu(cfi.icb.extLocation);
850 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
851 goto end_unlink;
852
853 if (!inode->i_nlink) {
854 udf_debug("Deleting nonexistent file (%lu), %d\n",
855 inode->i_ino, inode->i_nlink);
856 inode->i_nlink = 1;
857 }
858 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
859 if (retval)
860 goto end_unlink;
861 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
862 mark_inode_dirty(dir);
863 inode_dec_link_count(inode);
864 inode->i_ctime = dir->i_ctime;
865 retval = 0;
866
867 end_unlink:
868 if (fibh.sbh != fibh.ebh)
869 brelse(fibh.ebh);
870 brelse(fibh.sbh);
871
872 out:
873 unlock_kernel();
874 return retval;
875 }
876
877 static int udf_symlink(struct inode *dir, struct dentry *dentry,
878 const char *symname)
879 {
880 struct inode *inode;
881 struct pathComponent *pc;
882 const char *compstart;
883 struct udf_fileident_bh fibh;
884 struct extent_position epos = {};
885 int eoffset, elen = 0;
886 struct fileIdentDesc *fi;
887 struct fileIdentDesc cfi;
888 uint8_t *ea;
889 int err;
890 int block;
891 unsigned char *name = NULL;
892 int namelen;
893 struct udf_inode_info *iinfo;
894 struct super_block *sb = dir->i_sb;
895
896 lock_kernel();
897 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
898 if (!inode)
899 goto out;
900
901 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
902 if (!name) {
903 err = -ENOMEM;
904 goto out_no_entry;
905 }
906
907 iinfo = UDF_I(inode);
908 inode->i_data.a_ops = &udf_symlink_aops;
909 inode->i_op = &udf_symlink_inode_operations;
910
911 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
912 struct kernel_lb_addr eloc;
913 uint32_t bsize;
914
915 block = udf_new_block(sb, inode,
916 iinfo->i_location.partitionReferenceNum,
917 iinfo->i_location.logicalBlockNum, &err);
918 if (!block)
919 goto out_no_entry;
920 epos.block = iinfo->i_location;
921 epos.offset = udf_file_entry_alloc_offset(inode);
922 epos.bh = NULL;
923 eloc.logicalBlockNum = block;
924 eloc.partitionReferenceNum =
925 iinfo->i_location.partitionReferenceNum;
926 bsize = sb->s_blocksize;
927 iinfo->i_lenExtents = bsize;
928 udf_add_aext(inode, &epos, &eloc, bsize, 0);
929 brelse(epos.bh);
930
931 block = udf_get_pblock(sb, block,
932 iinfo->i_location.partitionReferenceNum,
933 0);
934 epos.bh = udf_tgetblk(sb, block);
935 lock_buffer(epos.bh);
936 memset(epos.bh->b_data, 0x00, bsize);
937 set_buffer_uptodate(epos.bh);
938 unlock_buffer(epos.bh);
939 mark_buffer_dirty_inode(epos.bh, inode);
940 ea = epos.bh->b_data + udf_ext0_offset(inode);
941 } else
942 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
943
944 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
945 pc = (struct pathComponent *)ea;
946
947 if (*symname == '/') {
948 do {
949 symname++;
950 } while (*symname == '/');
951
952 pc->componentType = 1;
953 pc->lengthComponentIdent = 0;
954 pc->componentFileVersionNum = 0;
955 elen += sizeof(struct pathComponent);
956 }
957
958 err = -ENAMETOOLONG;
959
960 while (*symname) {
961 if (elen + sizeof(struct pathComponent) > eoffset)
962 goto out_no_entry;
963
964 pc = (struct pathComponent *)(ea + elen);
965
966 compstart = symname;
967
968 do {
969 symname++;
970 } while (*symname && *symname != '/');
971
972 pc->componentType = 5;
973 pc->lengthComponentIdent = 0;
974 pc->componentFileVersionNum = 0;
975 if (compstart[0] == '.') {
976 if ((symname - compstart) == 1)
977 pc->componentType = 4;
978 else if ((symname - compstart) == 2 &&
979 compstart[1] == '.')
980 pc->componentType = 3;
981 }
982
983 if (pc->componentType == 5) {
984 namelen = udf_put_filename(sb, compstart, name,
985 symname - compstart);
986 if (!namelen)
987 goto out_no_entry;
988
989 if (elen + sizeof(struct pathComponent) + namelen >
990 eoffset)
991 goto out_no_entry;
992 else
993 pc->lengthComponentIdent = namelen;
994
995 memcpy(pc->componentIdent, name, namelen);
996 }
997
998 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
999
1000 if (*symname) {
1001 do {
1002 symname++;
1003 } while (*symname == '/');
1004 }
1005 }
1006
1007 brelse(epos.bh);
1008 inode->i_size = elen;
1009 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1010 iinfo->i_lenAlloc = inode->i_size;
1011 else
1012 udf_truncate_tail_extent(inode);
1013 mark_inode_dirty(inode);
1014
1015 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1016 if (!fi)
1017 goto out_no_entry;
1018 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1019 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1020 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1021 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1022 cpu_to_le32(lvid_get_unique_id(sb));
1023 }
1024 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1025 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1026 mark_inode_dirty(dir);
1027 if (fibh.sbh != fibh.ebh)
1028 brelse(fibh.ebh);
1029 brelse(fibh.sbh);
1030 d_instantiate(dentry, inode);
1031 err = 0;
1032
1033 out:
1034 kfree(name);
1035 unlock_kernel();
1036 return err;
1037
1038 out_no_entry:
1039 inode_dec_link_count(inode);
1040 iput(inode);
1041 goto out;
1042 }
1043
1044 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1045 struct dentry *dentry)
1046 {
1047 struct inode *inode = old_dentry->d_inode;
1048 struct udf_fileident_bh fibh;
1049 struct fileIdentDesc cfi, *fi;
1050 int err;
1051
1052 lock_kernel();
1053 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1054 unlock_kernel();
1055 return -EMLINK;
1056 }
1057
1058 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1059 if (!fi) {
1060 unlock_kernel();
1061 return err;
1062 }
1063 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1064 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1065 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1066 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1067 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1068 }
1069 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1070 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1071 mark_inode_dirty(dir);
1072
1073 if (fibh.sbh != fibh.ebh)
1074 brelse(fibh.ebh);
1075 brelse(fibh.sbh);
1076 inc_nlink(inode);
1077 inode->i_ctime = current_fs_time(inode->i_sb);
1078 mark_inode_dirty(inode);
1079 ihold(inode);
1080 d_instantiate(dentry, inode);
1081 unlock_kernel();
1082
1083 return 0;
1084 }
1085
1086 /* Anybody can rename anything with this: the permission checks are left to the
1087 * higher-level routines.
1088 */
1089 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1090 struct inode *new_dir, struct dentry *new_dentry)
1091 {
1092 struct inode *old_inode = old_dentry->d_inode;
1093 struct inode *new_inode = new_dentry->d_inode;
1094 struct udf_fileident_bh ofibh, nfibh;
1095 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1096 struct fileIdentDesc ocfi, ncfi;
1097 struct buffer_head *dir_bh = NULL;
1098 int retval = -ENOENT;
1099 struct kernel_lb_addr tloc;
1100 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1101
1102 lock_kernel();
1103 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1104 if (ofi) {
1105 if (ofibh.sbh != ofibh.ebh)
1106 brelse(ofibh.ebh);
1107 brelse(ofibh.sbh);
1108 }
1109 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1110 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1111 != old_inode->i_ino)
1112 goto end_rename;
1113
1114 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1115 if (nfi) {
1116 if (!new_inode) {
1117 if (nfibh.sbh != nfibh.ebh)
1118 brelse(nfibh.ebh);
1119 brelse(nfibh.sbh);
1120 nfi = NULL;
1121 }
1122 }
1123 if (S_ISDIR(old_inode->i_mode)) {
1124 int offset = udf_ext0_offset(old_inode);
1125
1126 if (new_inode) {
1127 retval = -ENOTEMPTY;
1128 if (!empty_dir(new_inode))
1129 goto end_rename;
1130 }
1131 retval = -EIO;
1132 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1133 dir_fi = udf_get_fileident(
1134 old_iinfo->i_ext.i_data -
1135 (old_iinfo->i_efe ?
1136 sizeof(struct extendedFileEntry) :
1137 sizeof(struct fileEntry)),
1138 old_inode->i_sb->s_blocksize, &offset);
1139 } else {
1140 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1141 if (!dir_bh)
1142 goto end_rename;
1143 dir_fi = udf_get_fileident(dir_bh->b_data,
1144 old_inode->i_sb->s_blocksize, &offset);
1145 }
1146 if (!dir_fi)
1147 goto end_rename;
1148 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1149 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1150 old_dir->i_ino)
1151 goto end_rename;
1152
1153 retval = -EMLINK;
1154 if (!new_inode &&
1155 new_dir->i_nlink >=
1156 (256 << sizeof(new_dir->i_nlink)) - 1)
1157 goto end_rename;
1158 }
1159 if (!nfi) {
1160 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1161 &retval);
1162 if (!nfi)
1163 goto end_rename;
1164 }
1165
1166 /*
1167 * Like most other Unix systems, set the ctime for inodes on a
1168 * rename.
1169 */
1170 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1171 mark_inode_dirty(old_inode);
1172
1173 /*
1174 * ok, that's it
1175 */
1176 ncfi.fileVersionNum = ocfi.fileVersionNum;
1177 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1178 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1179 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1180
1181 /* The old fid may have moved - find it again */
1182 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1183 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1184
1185 if (new_inode) {
1186 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1187 inode_dec_link_count(new_inode);
1188 }
1189 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1190 mark_inode_dirty(old_dir);
1191
1192 if (dir_fi) {
1193 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1194 udf_update_tag((char *)dir_fi,
1195 (sizeof(struct fileIdentDesc) +
1196 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1197 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1198 mark_inode_dirty(old_inode);
1199 else
1200 mark_buffer_dirty_inode(dir_bh, old_inode);
1201
1202 inode_dec_link_count(old_dir);
1203 if (new_inode)
1204 inode_dec_link_count(new_inode);
1205 else {
1206 inc_nlink(new_dir);
1207 mark_inode_dirty(new_dir);
1208 }
1209 }
1210
1211 if (ofi) {
1212 if (ofibh.sbh != ofibh.ebh)
1213 brelse(ofibh.ebh);
1214 brelse(ofibh.sbh);
1215 }
1216
1217 retval = 0;
1218
1219 end_rename:
1220 brelse(dir_bh);
1221 if (nfi) {
1222 if (nfibh.sbh != nfibh.ebh)
1223 brelse(nfibh.ebh);
1224 brelse(nfibh.sbh);
1225 }
1226 unlock_kernel();
1227
1228 return retval;
1229 }
1230
1231 static struct dentry *udf_get_parent(struct dentry *child)
1232 {
1233 struct kernel_lb_addr tloc;
1234 struct inode *inode = NULL;
1235 struct qstr dotdot = {.name = "..", .len = 2};
1236 struct fileIdentDesc cfi;
1237 struct udf_fileident_bh fibh;
1238
1239 lock_kernel();
1240 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1241 goto out_unlock;
1242
1243 if (fibh.sbh != fibh.ebh)
1244 brelse(fibh.ebh);
1245 brelse(fibh.sbh);
1246
1247 tloc = lelb_to_cpu(cfi.icb.extLocation);
1248 inode = udf_iget(child->d_inode->i_sb, &tloc);
1249 if (!inode)
1250 goto out_unlock;
1251 unlock_kernel();
1252
1253 return d_obtain_alias(inode);
1254 out_unlock:
1255 unlock_kernel();
1256 return ERR_PTR(-EACCES);
1257 }
1258
1259
1260 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1261 u16 partref, __u32 generation)
1262 {
1263 struct inode *inode;
1264 struct kernel_lb_addr loc;
1265
1266 if (block == 0)
1267 return ERR_PTR(-ESTALE);
1268
1269 loc.logicalBlockNum = block;
1270 loc.partitionReferenceNum = partref;
1271 inode = udf_iget(sb, &loc);
1272
1273 if (inode == NULL)
1274 return ERR_PTR(-ENOMEM);
1275
1276 if (generation && inode->i_generation != generation) {
1277 iput(inode);
1278 return ERR_PTR(-ESTALE);
1279 }
1280 return d_obtain_alias(inode);
1281 }
1282
1283 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1284 struct fid *fid, int fh_len, int fh_type)
1285 {
1286 if ((fh_len != 3 && fh_len != 5) ||
1287 (fh_type != FILEID_UDF_WITH_PARENT &&
1288 fh_type != FILEID_UDF_WITHOUT_PARENT))
1289 return NULL;
1290
1291 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1292 fid->udf.generation);
1293 }
1294
1295 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1296 struct fid *fid, int fh_len, int fh_type)
1297 {
1298 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1299 return NULL;
1300
1301 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1302 fid->udf.parent_partref,
1303 fid->udf.parent_generation);
1304 }
1305 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1306 int connectable)
1307 {
1308 int len = *lenp;
1309 struct inode *inode = de->d_inode;
1310 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1311 struct fid *fid = (struct fid *)fh;
1312 int type = FILEID_UDF_WITHOUT_PARENT;
1313
1314 if (len < 3 || (connectable && len < 5))
1315 return 255;
1316
1317 *lenp = 3;
1318 fid->udf.block = location.logicalBlockNum;
1319 fid->udf.partref = location.partitionReferenceNum;
1320 fid->udf.generation = inode->i_generation;
1321
1322 if (connectable && !S_ISDIR(inode->i_mode)) {
1323 spin_lock(&de->d_lock);
1324 inode = de->d_parent->d_inode;
1325 location = UDF_I(inode)->i_location;
1326 fid->udf.parent_block = location.logicalBlockNum;
1327 fid->udf.parent_partref = location.partitionReferenceNum;
1328 fid->udf.parent_generation = inode->i_generation;
1329 spin_unlock(&de->d_lock);
1330 *lenp = 5;
1331 type = FILEID_UDF_WITH_PARENT;
1332 }
1333
1334 return type;
1335 }
1336
1337 const struct export_operations udf_export_ops = {
1338 .encode_fh = udf_encode_fh,
1339 .fh_to_dentry = udf_fh_to_dentry,
1340 .fh_to_parent = udf_fh_to_parent,
1341 .get_parent = udf_get_parent,
1342 };
1343
1344 const struct inode_operations udf_dir_inode_operations = {
1345 .lookup = udf_lookup,
1346 .create = udf_create,
1347 .link = udf_link,
1348 .unlink = udf_unlink,
1349 .symlink = udf_symlink,
1350 .mkdir = udf_mkdir,
1351 .rmdir = udf_rmdir,
1352 .mknod = udf_mknod,
1353 .rename = udf_rename,
1354 };
1355 const struct inode_operations udf_symlink_inode_operations = {
1356 .readlink = generic_readlink,
1357 .follow_link = page_follow_link_light,
1358 .put_link = page_put_link,
1359 };
Linux kernel - Deliverables
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