Loading...
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/sched.h>
31#include <linux/crc-itu-t.h>
32#include <linux/exportfs.h>
33
34static inline int udf_match(int len1, const unsigned char *name1, int len2,
35 const unsigned char *name2)
36{
37 if (len1 != len2)
38 return 0;
39
40 return !memcmp(name1, name2, len1);
41}
42
43int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
45 uint8_t *impuse, uint8_t *fileident)
46{
47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
48 uint16_t crc;
49 int offset;
50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
51 uint8_t lfi = cfi->lengthFileIdent;
52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
53 sizeof(struct fileIdentDesc);
54 int adinicb = 0;
55
56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
57 adinicb = 1;
58
59 offset = fibh->soffset + sizeof(struct fileIdentDesc);
60
61 if (impuse) {
62 if (adinicb || (offset + liu < 0)) {
63 memcpy((uint8_t *)sfi->impUse, impuse, liu);
64 } else if (offset >= 0) {
65 memcpy(fibh->ebh->b_data + offset, impuse, liu);
66 } else {
67 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
68 memcpy(fibh->ebh->b_data, impuse - offset,
69 liu + offset);
70 }
71 }
72
73 offset += liu;
74
75 if (fileident) {
76 if (adinicb || (offset + lfi < 0)) {
77 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
78 } else if (offset >= 0) {
79 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
80 } else {
81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
82 -offset);
83 memcpy(fibh->ebh->b_data, fileident - offset,
84 lfi + offset);
85 }
86 }
87
88 offset += lfi;
89
90 if (adinicb || (offset + padlen < 0)) {
91 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
92 } else if (offset >= 0) {
93 memset(fibh->ebh->b_data + offset, 0x00, padlen);
94 } else {
95 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
96 memset(fibh->ebh->b_data, 0x00, padlen + offset);
97 }
98
99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
100 sizeof(struct fileIdentDesc) - sizeof(struct tag));
101
102 if (fibh->sbh == fibh->ebh) {
103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
104 crclen + sizeof(struct tag) -
105 sizeof(struct fileIdentDesc));
106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
107 crc = crc_itu_t(crc, fibh->ebh->b_data +
108 sizeof(struct fileIdentDesc) +
109 fibh->soffset,
110 crclen + sizeof(struct tag) -
111 sizeof(struct fileIdentDesc));
112 } else {
113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
114 -fibh->soffset - sizeof(struct fileIdentDesc));
115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
116 }
117
118 cfi->descTag.descCRC = cpu_to_le16(crc);
119 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
121
122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
123 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
124 sizeof(struct fileIdentDesc));
125 } else {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
128 sizeof(struct fileIdentDesc) + fibh->soffset);
129 }
130
131 if (adinicb) {
132 mark_inode_dirty(inode);
133 } else {
134 if (fibh->sbh != fibh->ebh)
135 mark_buffer_dirty_inode(fibh->ebh, inode);
136 mark_buffer_dirty_inode(fibh->sbh, inode);
137 }
138 return 0;
139}
140
141/**
142 * udf_find_entry - find entry in given directory.
143 *
144 * @dir: directory inode to search in
145 * @child: qstr of the name
146 * @fibh: buffer head / inode with file identifier descriptor we found
147 * @cfi: found file identifier descriptor with given name
148 *
149 * This function searches in the directory @dir for a file name @child. When
150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
151 * directories) containing the file identifier descriptor (FID). In that case
152 * the function returns pointer to the FID in the buffer or inode - but note
153 * that FID may be split among two buffers (blocks) so accessing it via that
154 * pointer isn't easily possible. This pointer can be used only as an iterator
155 * for other directory manipulation functions. For inspection of the FID @cfi
156 * can be used - the found FID is copied there.
157 *
158 * Returns pointer to FID, NULL when nothing found, or error code.
159 */
160static struct fileIdentDesc *udf_find_entry(struct inode *dir,
161 const struct qstr *child,
162 struct udf_fileident_bh *fibh,
163 struct fileIdentDesc *cfi)
164{
165 struct fileIdentDesc *fi = NULL;
166 loff_t f_pos;
167 int block, flen;
168 unsigned char *fname = NULL, *copy_name = NULL;
169 unsigned char *nameptr;
170 uint8_t lfi;
171 uint16_t liu;
172 loff_t size;
173 struct kernel_lb_addr eloc;
174 uint32_t elen;
175 sector_t offset;
176 struct extent_position epos = {};
177 struct udf_inode_info *dinfo = UDF_I(dir);
178 int isdotdot = child->len == 2 &&
179 child->name[0] == '.' && child->name[1] == '.';
180 struct super_block *sb = dir->i_sb;
181
182 size = udf_ext0_offset(dir) + dir->i_size;
183 f_pos = udf_ext0_offset(dir);
184
185 fibh->sbh = fibh->ebh = NULL;
186 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
187 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
188 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
189 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
190 fi = ERR_PTR(-EIO);
191 goto out_err;
192 }
193
194 block = udf_get_lb_pblock(sb, &eloc, offset);
195 if ((++offset << sb->s_blocksize_bits) < elen) {
196 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
197 epos.offset -= sizeof(struct short_ad);
198 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
199 epos.offset -= sizeof(struct long_ad);
200 } else
201 offset = 0;
202
203 fibh->sbh = fibh->ebh = udf_tread(sb, block);
204 if (!fibh->sbh) {
205 fi = ERR_PTR(-EIO);
206 goto out_err;
207 }
208 }
209
210 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
211 if (!fname) {
212 fi = ERR_PTR(-ENOMEM);
213 goto out_err;
214 }
215
216 while (f_pos < size) {
217 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
218 &elen, &offset);
219 if (!fi) {
220 fi = ERR_PTR(-EIO);
221 goto out_err;
222 }
223
224 liu = le16_to_cpu(cfi->lengthOfImpUse);
225 lfi = cfi->lengthFileIdent;
226
227 if (fibh->sbh == fibh->ebh) {
228 nameptr = fi->fileIdent + liu;
229 } else {
230 int poffset; /* Unpaded ending offset */
231
232 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
233 liu + lfi;
234
235 if (poffset >= lfi)
236 nameptr = (uint8_t *)(fibh->ebh->b_data +
237 poffset - lfi);
238 else {
239 if (!copy_name) {
240 copy_name = kmalloc(UDF_NAME_LEN,
241 GFP_NOFS);
242 if (!copy_name) {
243 fi = ERR_PTR(-ENOMEM);
244 goto out_err;
245 }
246 }
247 nameptr = copy_name;
248 memcpy(nameptr, fi->fileIdent + liu,
249 lfi - poffset);
250 memcpy(nameptr + lfi - poffset,
251 fibh->ebh->b_data, poffset);
252 }
253 }
254
255 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
256 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
257 continue;
258 }
259
260 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
261 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
262 continue;
263 }
264
265 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
266 isdotdot)
267 goto out_ok;
268
269 if (!lfi)
270 continue;
271
272 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
273 if (flen < 0) {
274 fi = ERR_PTR(flen);
275 goto out_err;
276 }
277
278 if (udf_match(flen, fname, child->len, child->name))
279 goto out_ok;
280 }
281
282 fi = NULL;
283out_err:
284 if (fibh->sbh != fibh->ebh)
285 brelse(fibh->ebh);
286 brelse(fibh->sbh);
287out_ok:
288 brelse(epos.bh);
289 kfree(fname);
290 kfree(copy_name);
291
292 return fi;
293}
294
295static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
296 unsigned int flags)
297{
298 struct inode *inode = NULL;
299 struct fileIdentDesc cfi;
300 struct udf_fileident_bh fibh;
301 struct fileIdentDesc *fi;
302
303 if (dentry->d_name.len > UDF_NAME_LEN)
304 return ERR_PTR(-ENAMETOOLONG);
305
306#ifdef UDF_RECOVERY
307 /* temporary shorthand for specifying files by inode number */
308 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
309 struct kernel_lb_addr lb = {
310 .logicalBlockNum = 0,
311 .partitionReferenceNum =
312 simple_strtoul(dentry->d_name.name + 3,
313 NULL, 0),
314 };
315 inode = udf_iget(dir->i_sb, lb);
316 if (IS_ERR(inode))
317 return inode;
318 } else
319#endif /* UDF_RECOVERY */
320
321 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
322 if (IS_ERR(fi))
323 return ERR_CAST(fi);
324
325 if (fi) {
326 struct kernel_lb_addr loc;
327
328 if (fibh.sbh != fibh.ebh)
329 brelse(fibh.ebh);
330 brelse(fibh.sbh);
331
332 loc = lelb_to_cpu(cfi.icb.extLocation);
333 inode = udf_iget(dir->i_sb, &loc);
334 if (IS_ERR(inode))
335 return ERR_CAST(inode);
336 }
337
338 return d_splice_alias(inode, dentry);
339}
340
341static struct fileIdentDesc *udf_add_entry(struct inode *dir,
342 struct dentry *dentry,
343 struct udf_fileident_bh *fibh,
344 struct fileIdentDesc *cfi, int *err)
345{
346 struct super_block *sb = dir->i_sb;
347 struct fileIdentDesc *fi = NULL;
348 unsigned char *name = NULL;
349 int namelen;
350 loff_t f_pos;
351 loff_t size = udf_ext0_offset(dir) + dir->i_size;
352 int nfidlen;
353 uint8_t lfi;
354 uint16_t liu;
355 int block;
356 struct kernel_lb_addr eloc;
357 uint32_t elen = 0;
358 sector_t offset;
359 struct extent_position epos = {};
360 struct udf_inode_info *dinfo;
361
362 fibh->sbh = fibh->ebh = NULL;
363 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
364 if (!name) {
365 *err = -ENOMEM;
366 goto out_err;
367 }
368
369 if (dentry) {
370 if (!dentry->d_name.len) {
371 *err = -EINVAL;
372 goto out_err;
373 }
374 namelen = udf_put_filename(sb, dentry->d_name.name,
375 dentry->d_name.len,
376 name, UDF_NAME_LEN_CS0);
377 if (!namelen) {
378 *err = -ENAMETOOLONG;
379 goto out_err;
380 }
381 } else {
382 namelen = 0;
383 }
384
385 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
386
387 f_pos = udf_ext0_offset(dir);
388
389 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
390 dinfo = UDF_I(dir);
391 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
392 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
393 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
394 block = udf_get_lb_pblock(dir->i_sb,
395 &dinfo->i_location, 0);
396 fibh->soffset = fibh->eoffset = sb->s_blocksize;
397 goto add;
398 }
399 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
400 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
401 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
402 epos.offset -= sizeof(struct short_ad);
403 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
404 epos.offset -= sizeof(struct long_ad);
405 } else
406 offset = 0;
407
408 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
409 if (!fibh->sbh) {
410 *err = -EIO;
411 goto out_err;
412 }
413
414 block = dinfo->i_location.logicalBlockNum;
415 }
416
417 while (f_pos < size) {
418 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
419 &elen, &offset);
420
421 if (!fi) {
422 *err = -EIO;
423 goto out_err;
424 }
425
426 liu = le16_to_cpu(cfi->lengthOfImpUse);
427 lfi = cfi->lengthFileIdent;
428
429 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
430 if (((sizeof(struct fileIdentDesc) +
431 liu + lfi + 3) & ~3) == nfidlen) {
432 cfi->descTag.tagSerialNum = cpu_to_le16(1);
433 cfi->fileVersionNum = cpu_to_le16(1);
434 cfi->fileCharacteristics = 0;
435 cfi->lengthFileIdent = namelen;
436 cfi->lengthOfImpUse = cpu_to_le16(0);
437 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
438 name))
439 goto out_ok;
440 else {
441 *err = -EIO;
442 goto out_err;
443 }
444 }
445 }
446 }
447
448add:
449 f_pos += nfidlen;
450
451 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
452 sb->s_blocksize - fibh->eoffset < nfidlen) {
453 brelse(epos.bh);
454 epos.bh = NULL;
455 fibh->soffset -= udf_ext0_offset(dir);
456 fibh->eoffset -= udf_ext0_offset(dir);
457 f_pos -= udf_ext0_offset(dir);
458 if (fibh->sbh != fibh->ebh)
459 brelse(fibh->ebh);
460 brelse(fibh->sbh);
461 fibh->sbh = fibh->ebh =
462 udf_expand_dir_adinicb(dir, &block, err);
463 if (!fibh->sbh)
464 goto out_err;
465 epos.block = dinfo->i_location;
466 epos.offset = udf_file_entry_alloc_offset(dir);
467 /* Load extent udf_expand_dir_adinicb() has created */
468 udf_current_aext(dir, &epos, &eloc, &elen, 1);
469 }
470
471 /* Entry fits into current block? */
472 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
473 fibh->soffset = fibh->eoffset;
474 fibh->eoffset += nfidlen;
475 if (fibh->sbh != fibh->ebh) {
476 brelse(fibh->sbh);
477 fibh->sbh = fibh->ebh;
478 }
479
480 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
481 block = dinfo->i_location.logicalBlockNum;
482 fi = (struct fileIdentDesc *)
483 (dinfo->i_ext.i_data +
484 fibh->soffset -
485 udf_ext0_offset(dir) +
486 dinfo->i_lenEAttr);
487 } else {
488 block = eloc.logicalBlockNum +
489 ((elen - 1) >>
490 dir->i_sb->s_blocksize_bits);
491 fi = (struct fileIdentDesc *)
492 (fibh->sbh->b_data + fibh->soffset);
493 }
494 } else {
495 /* Round up last extent in the file */
496 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
497 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
498 epos.offset -= sizeof(struct short_ad);
499 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
500 epos.offset -= sizeof(struct long_ad);
501 udf_write_aext(dir, &epos, &eloc, elen, 1);
502 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
503 - 1) & ~(sb->s_blocksize - 1);
504
505 fibh->soffset = fibh->eoffset - sb->s_blocksize;
506 fibh->eoffset += nfidlen - sb->s_blocksize;
507 if (fibh->sbh != fibh->ebh) {
508 brelse(fibh->sbh);
509 fibh->sbh = fibh->ebh;
510 }
511
512 block = eloc.logicalBlockNum + ((elen - 1) >>
513 dir->i_sb->s_blocksize_bits);
514 fibh->ebh = udf_bread(dir,
515 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
516 if (!fibh->ebh)
517 goto out_err;
518 /* Extents could have been merged, invalidate our position */
519 brelse(epos.bh);
520 epos.bh = NULL;
521 epos.block = dinfo->i_location;
522 epos.offset = udf_file_entry_alloc_offset(dir);
523
524 if (!fibh->soffset) {
525 /* Find the freshly allocated block */
526 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
527 (EXT_RECORDED_ALLOCATED >> 30))
528 ;
529 block = eloc.logicalBlockNum + ((elen - 1) >>
530 dir->i_sb->s_blocksize_bits);
531 brelse(fibh->sbh);
532 fibh->sbh = fibh->ebh;
533 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
534 } else {
535 fi = (struct fileIdentDesc *)
536 (fibh->sbh->b_data + sb->s_blocksize +
537 fibh->soffset);
538 }
539 }
540
541 memset(cfi, 0, sizeof(struct fileIdentDesc));
542 if (UDF_SB(sb)->s_udfrev >= 0x0200)
543 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
544 sizeof(struct tag));
545 else
546 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
547 sizeof(struct tag));
548 cfi->fileVersionNum = cpu_to_le16(1);
549 cfi->lengthFileIdent = namelen;
550 cfi->lengthOfImpUse = cpu_to_le16(0);
551 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
552 dir->i_size += nfidlen;
553 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
554 dinfo->i_lenAlloc += nfidlen;
555 else {
556 /* Find the last extent and truncate it to proper size */
557 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
558 (EXT_RECORDED_ALLOCATED >> 30))
559 ;
560 elen -= dinfo->i_lenExtents - dir->i_size;
561 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
562 epos.offset -= sizeof(struct short_ad);
563 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
564 epos.offset -= sizeof(struct long_ad);
565 udf_write_aext(dir, &epos, &eloc, elen, 1);
566 dinfo->i_lenExtents = dir->i_size;
567 }
568
569 mark_inode_dirty(dir);
570 goto out_ok;
571 } else {
572 *err = -EIO;
573 goto out_err;
574 }
575
576out_err:
577 fi = NULL;
578 if (fibh->sbh != fibh->ebh)
579 brelse(fibh->ebh);
580 brelse(fibh->sbh);
581out_ok:
582 brelse(epos.bh);
583 kfree(name);
584 return fi;
585}
586
587static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
588 struct udf_fileident_bh *fibh,
589 struct fileIdentDesc *cfi)
590{
591 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
592
593 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
594 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
595
596 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
597}
598
599static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
600{
601 struct udf_inode_info *iinfo = UDF_I(inode);
602 struct inode *dir = d_inode(dentry->d_parent);
603 struct udf_fileident_bh fibh;
604 struct fileIdentDesc cfi, *fi;
605 int err;
606
607 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
608 if (unlikely(!fi)) {
609 inode_dec_link_count(inode);
610 unlock_new_inode(inode);
611 iput(inode);
612 return err;
613 }
614 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
615 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
616 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
617 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
618 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
619 dir->i_ctime = dir->i_mtime = current_time(dir);
620 mark_inode_dirty(dir);
621 if (fibh.sbh != fibh.ebh)
622 brelse(fibh.ebh);
623 brelse(fibh.sbh);
624 unlock_new_inode(inode);
625 d_instantiate(dentry, inode);
626
627 return 0;
628}
629
630static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
631 bool excl)
632{
633 struct inode *inode = udf_new_inode(dir, mode);
634
635 if (IS_ERR(inode))
636 return PTR_ERR(inode);
637
638 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
639 inode->i_data.a_ops = &udf_adinicb_aops;
640 else
641 inode->i_data.a_ops = &udf_aops;
642 inode->i_op = &udf_file_inode_operations;
643 inode->i_fop = &udf_file_operations;
644 mark_inode_dirty(inode);
645
646 return udf_add_nondir(dentry, inode);
647}
648
649static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
650{
651 struct inode *inode = udf_new_inode(dir, mode);
652
653 if (IS_ERR(inode))
654 return PTR_ERR(inode);
655
656 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
657 inode->i_data.a_ops = &udf_adinicb_aops;
658 else
659 inode->i_data.a_ops = &udf_aops;
660 inode->i_op = &udf_file_inode_operations;
661 inode->i_fop = &udf_file_operations;
662 mark_inode_dirty(inode);
663 d_tmpfile(dentry, inode);
664 unlock_new_inode(inode);
665 return 0;
666}
667
668static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
669 dev_t rdev)
670{
671 struct inode *inode;
672
673 if (!old_valid_dev(rdev))
674 return -EINVAL;
675
676 inode = udf_new_inode(dir, mode);
677 if (IS_ERR(inode))
678 return PTR_ERR(inode);
679
680 init_special_inode(inode, mode, rdev);
681 return udf_add_nondir(dentry, inode);
682}
683
684static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
685{
686 struct inode *inode;
687 struct udf_fileident_bh fibh;
688 struct fileIdentDesc cfi, *fi;
689 int err;
690 struct udf_inode_info *dinfo = UDF_I(dir);
691 struct udf_inode_info *iinfo;
692
693 inode = udf_new_inode(dir, S_IFDIR | mode);
694 if (IS_ERR(inode))
695 return PTR_ERR(inode);
696
697 iinfo = UDF_I(inode);
698 inode->i_op = &udf_dir_inode_operations;
699 inode->i_fop = &udf_dir_operations;
700 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
701 if (!fi) {
702 inode_dec_link_count(inode);
703 unlock_new_inode(inode);
704 iput(inode);
705 goto out;
706 }
707 set_nlink(inode, 2);
708 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
709 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
710 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
711 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
712 cfi.fileCharacteristics =
713 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
714 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
715 brelse(fibh.sbh);
716 mark_inode_dirty(inode);
717
718 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
719 if (!fi) {
720 clear_nlink(inode);
721 mark_inode_dirty(inode);
722 unlock_new_inode(inode);
723 iput(inode);
724 goto out;
725 }
726 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
727 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
728 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
729 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
730 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
731 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
732 inc_nlink(dir);
733 dir->i_ctime = dir->i_mtime = current_time(dir);
734 mark_inode_dirty(dir);
735 unlock_new_inode(inode);
736 d_instantiate(dentry, inode);
737 if (fibh.sbh != fibh.ebh)
738 brelse(fibh.ebh);
739 brelse(fibh.sbh);
740 err = 0;
741
742out:
743 return err;
744}
745
746static int empty_dir(struct inode *dir)
747{
748 struct fileIdentDesc *fi, cfi;
749 struct udf_fileident_bh fibh;
750 loff_t f_pos;
751 loff_t size = udf_ext0_offset(dir) + dir->i_size;
752 int block;
753 struct kernel_lb_addr eloc;
754 uint32_t elen;
755 sector_t offset;
756 struct extent_position epos = {};
757 struct udf_inode_info *dinfo = UDF_I(dir);
758
759 f_pos = udf_ext0_offset(dir);
760 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
761
762 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
763 fibh.sbh = fibh.ebh = NULL;
764 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
765 &epos, &eloc, &elen, &offset) ==
766 (EXT_RECORDED_ALLOCATED >> 30)) {
767 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
768 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
769 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
770 epos.offset -= sizeof(struct short_ad);
771 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
772 epos.offset -= sizeof(struct long_ad);
773 } else
774 offset = 0;
775
776 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
777 if (!fibh.sbh) {
778 brelse(epos.bh);
779 return 0;
780 }
781 } else {
782 brelse(epos.bh);
783 return 0;
784 }
785
786 while (f_pos < size) {
787 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
788 &elen, &offset);
789 if (!fi) {
790 if (fibh.sbh != fibh.ebh)
791 brelse(fibh.ebh);
792 brelse(fibh.sbh);
793 brelse(epos.bh);
794 return 0;
795 }
796
797 if (cfi.lengthFileIdent &&
798 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
799 if (fibh.sbh != fibh.ebh)
800 brelse(fibh.ebh);
801 brelse(fibh.sbh);
802 brelse(epos.bh);
803 return 0;
804 }
805 }
806
807 if (fibh.sbh != fibh.ebh)
808 brelse(fibh.ebh);
809 brelse(fibh.sbh);
810 brelse(epos.bh);
811
812 return 1;
813}
814
815static int udf_rmdir(struct inode *dir, struct dentry *dentry)
816{
817 int retval;
818 struct inode *inode = d_inode(dentry);
819 struct udf_fileident_bh fibh;
820 struct fileIdentDesc *fi, cfi;
821 struct kernel_lb_addr tloc;
822
823 retval = -ENOENT;
824 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
825 if (IS_ERR_OR_NULL(fi)) {
826 if (fi)
827 retval = PTR_ERR(fi);
828 goto out;
829 }
830
831 retval = -EIO;
832 tloc = lelb_to_cpu(cfi.icb.extLocation);
833 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
834 goto end_rmdir;
835 retval = -ENOTEMPTY;
836 if (!empty_dir(inode))
837 goto end_rmdir;
838 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
839 if (retval)
840 goto end_rmdir;
841 if (inode->i_nlink != 2)
842 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
843 inode->i_nlink);
844 clear_nlink(inode);
845 inode->i_size = 0;
846 inode_dec_link_count(dir);
847 inode->i_ctime = dir->i_ctime = dir->i_mtime =
848 current_time(inode);
849 mark_inode_dirty(dir);
850
851end_rmdir:
852 if (fibh.sbh != fibh.ebh)
853 brelse(fibh.ebh);
854 brelse(fibh.sbh);
855
856out:
857 return retval;
858}
859
860static int udf_unlink(struct inode *dir, struct dentry *dentry)
861{
862 int retval;
863 struct inode *inode = d_inode(dentry);
864 struct udf_fileident_bh fibh;
865 struct fileIdentDesc *fi;
866 struct fileIdentDesc cfi;
867 struct kernel_lb_addr tloc;
868
869 retval = -ENOENT;
870 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
871
872 if (IS_ERR_OR_NULL(fi)) {
873 if (fi)
874 retval = PTR_ERR(fi);
875 goto out;
876 }
877
878 retval = -EIO;
879 tloc = lelb_to_cpu(cfi.icb.extLocation);
880 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
881 goto end_unlink;
882
883 if (!inode->i_nlink) {
884 udf_debug("Deleting nonexistent file (%lu), %d\n",
885 inode->i_ino, inode->i_nlink);
886 set_nlink(inode, 1);
887 }
888 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
889 if (retval)
890 goto end_unlink;
891 dir->i_ctime = dir->i_mtime = current_time(dir);
892 mark_inode_dirty(dir);
893 inode_dec_link_count(inode);
894 inode->i_ctime = dir->i_ctime;
895 retval = 0;
896
897end_unlink:
898 if (fibh.sbh != fibh.ebh)
899 brelse(fibh.ebh);
900 brelse(fibh.sbh);
901
902out:
903 return retval;
904}
905
906static int udf_symlink(struct inode *dir, struct dentry *dentry,
907 const char *symname)
908{
909 struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO);
910 struct pathComponent *pc;
911 const char *compstart;
912 struct extent_position epos = {};
913 int eoffset, elen = 0;
914 uint8_t *ea;
915 int err;
916 int block;
917 unsigned char *name = NULL;
918 int namelen;
919 struct udf_inode_info *iinfo;
920 struct super_block *sb = dir->i_sb;
921
922 if (IS_ERR(inode))
923 return PTR_ERR(inode);
924
925 iinfo = UDF_I(inode);
926 down_write(&iinfo->i_data_sem);
927 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
928 if (!name) {
929 err = -ENOMEM;
930 goto out_no_entry;
931 }
932
933 inode->i_data.a_ops = &udf_symlink_aops;
934 inode->i_op = &page_symlink_inode_operations;
935 inode_nohighmem(inode);
936
937 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
938 struct kernel_lb_addr eloc;
939 uint32_t bsize;
940
941 block = udf_new_block(sb, inode,
942 iinfo->i_location.partitionReferenceNum,
943 iinfo->i_location.logicalBlockNum, &err);
944 if (!block)
945 goto out_no_entry;
946 epos.block = iinfo->i_location;
947 epos.offset = udf_file_entry_alloc_offset(inode);
948 epos.bh = NULL;
949 eloc.logicalBlockNum = block;
950 eloc.partitionReferenceNum =
951 iinfo->i_location.partitionReferenceNum;
952 bsize = sb->s_blocksize;
953 iinfo->i_lenExtents = bsize;
954 udf_add_aext(inode, &epos, &eloc, bsize, 0);
955 brelse(epos.bh);
956
957 block = udf_get_pblock(sb, block,
958 iinfo->i_location.partitionReferenceNum,
959 0);
960 epos.bh = udf_tgetblk(sb, block);
961 lock_buffer(epos.bh);
962 memset(epos.bh->b_data, 0x00, bsize);
963 set_buffer_uptodate(epos.bh);
964 unlock_buffer(epos.bh);
965 mark_buffer_dirty_inode(epos.bh, inode);
966 ea = epos.bh->b_data + udf_ext0_offset(inode);
967 } else
968 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
969
970 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
971 pc = (struct pathComponent *)ea;
972
973 if (*symname == '/') {
974 do {
975 symname++;
976 } while (*symname == '/');
977
978 pc->componentType = 1;
979 pc->lengthComponentIdent = 0;
980 pc->componentFileVersionNum = 0;
981 elen += sizeof(struct pathComponent);
982 }
983
984 err = -ENAMETOOLONG;
985
986 while (*symname) {
987 if (elen + sizeof(struct pathComponent) > eoffset)
988 goto out_no_entry;
989
990 pc = (struct pathComponent *)(ea + elen);
991
992 compstart = symname;
993
994 do {
995 symname++;
996 } while (*symname && *symname != '/');
997
998 pc->componentType = 5;
999 pc->lengthComponentIdent = 0;
1000 pc->componentFileVersionNum = 0;
1001 if (compstart[0] == '.') {
1002 if ((symname - compstart) == 1)
1003 pc->componentType = 4;
1004 else if ((symname - compstart) == 2 &&
1005 compstart[1] == '.')
1006 pc->componentType = 3;
1007 }
1008
1009 if (pc->componentType == 5) {
1010 namelen = udf_put_filename(sb, compstart,
1011 symname - compstart,
1012 name, UDF_NAME_LEN_CS0);
1013 if (!namelen)
1014 goto out_no_entry;
1015
1016 if (elen + sizeof(struct pathComponent) + namelen >
1017 eoffset)
1018 goto out_no_entry;
1019 else
1020 pc->lengthComponentIdent = namelen;
1021
1022 memcpy(pc->componentIdent, name, namelen);
1023 }
1024
1025 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1026
1027 if (*symname) {
1028 do {
1029 symname++;
1030 } while (*symname == '/');
1031 }
1032 }
1033
1034 brelse(epos.bh);
1035 inode->i_size = elen;
1036 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1037 iinfo->i_lenAlloc = inode->i_size;
1038 else
1039 udf_truncate_tail_extent(inode);
1040 mark_inode_dirty(inode);
1041 up_write(&iinfo->i_data_sem);
1042
1043 err = udf_add_nondir(dentry, inode);
1044out:
1045 kfree(name);
1046 return err;
1047
1048out_no_entry:
1049 up_write(&iinfo->i_data_sem);
1050 inode_dec_link_count(inode);
1051 unlock_new_inode(inode);
1052 iput(inode);
1053 goto out;
1054}
1055
1056static int udf_link(struct dentry *old_dentry, struct inode *dir,
1057 struct dentry *dentry)
1058{
1059 struct inode *inode = d_inode(old_dentry);
1060 struct udf_fileident_bh fibh;
1061 struct fileIdentDesc cfi, *fi;
1062 int err;
1063
1064 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1065 if (!fi) {
1066 return err;
1067 }
1068 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1069 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1070 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1071 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1072 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1073 }
1074 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1075 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1076 mark_inode_dirty(dir);
1077
1078 if (fibh.sbh != fibh.ebh)
1079 brelse(fibh.ebh);
1080 brelse(fibh.sbh);
1081 inc_nlink(inode);
1082 inode->i_ctime = current_time(inode);
1083 mark_inode_dirty(inode);
1084 dir->i_ctime = dir->i_mtime = current_time(dir);
1085 mark_inode_dirty(dir);
1086 ihold(inode);
1087 d_instantiate(dentry, inode);
1088
1089 return 0;
1090}
1091
1092/* Anybody can rename anything with this: the permission checks are left to the
1093 * higher-level routines.
1094 */
1095static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1096 struct inode *new_dir, struct dentry *new_dentry,
1097 unsigned int flags)
1098{
1099 struct inode *old_inode = d_inode(old_dentry);
1100 struct inode *new_inode = d_inode(new_dentry);
1101 struct udf_fileident_bh ofibh, nfibh;
1102 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1103 struct fileIdentDesc ocfi, ncfi;
1104 struct buffer_head *dir_bh = NULL;
1105 int retval = -ENOENT;
1106 struct kernel_lb_addr tloc;
1107 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1108
1109 if (flags & ~RENAME_NOREPLACE)
1110 return -EINVAL;
1111
1112 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1113 if (IS_ERR(ofi)) {
1114 retval = PTR_ERR(ofi);
1115 goto end_rename;
1116 }
1117
1118 if (ofibh.sbh != ofibh.ebh)
1119 brelse(ofibh.ebh);
1120
1121 brelse(ofibh.sbh);
1122 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1123 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1124 != old_inode->i_ino)
1125 goto end_rename;
1126
1127 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1128 if (IS_ERR(nfi)) {
1129 retval = PTR_ERR(nfi);
1130 goto end_rename;
1131 }
1132 if (nfi && !new_inode) {
1133 if (nfibh.sbh != nfibh.ebh)
1134 brelse(nfibh.ebh);
1135 brelse(nfibh.sbh);
1136 nfi = NULL;
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 if (!nfi) {
1169 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1170 &retval);
1171 if (!nfi)
1172 goto end_rename;
1173 }
1174
1175 /*
1176 * Like most other Unix systems, set the ctime for inodes on a
1177 * rename.
1178 */
1179 old_inode->i_ctime = current_time(old_inode);
1180 mark_inode_dirty(old_inode);
1181
1182 /*
1183 * ok, that's it
1184 */
1185 ncfi.fileVersionNum = ocfi.fileVersionNum;
1186 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1187 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1188 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1189
1190 /* The old fid may have moved - find it again */
1191 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1192 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1193
1194 if (new_inode) {
1195 new_inode->i_ctime = current_time(new_inode);
1196 inode_dec_link_count(new_inode);
1197 }
1198 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1199 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1200 mark_inode_dirty(old_dir);
1201 mark_inode_dirty(new_dir);
1202
1203 if (dir_fi) {
1204 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1205 udf_update_tag((char *)dir_fi,
1206 (sizeof(struct fileIdentDesc) +
1207 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1208 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1209 mark_inode_dirty(old_inode);
1210 else
1211 mark_buffer_dirty_inode(dir_bh, old_inode);
1212
1213 inode_dec_link_count(old_dir);
1214 if (new_inode)
1215 inode_dec_link_count(new_inode);
1216 else {
1217 inc_nlink(new_dir);
1218 mark_inode_dirty(new_dir);
1219 }
1220 }
1221
1222 if (ofi) {
1223 if (ofibh.sbh != ofibh.ebh)
1224 brelse(ofibh.ebh);
1225 brelse(ofibh.sbh);
1226 }
1227
1228 retval = 0;
1229
1230end_rename:
1231 brelse(dir_bh);
1232 if (nfi) {
1233 if (nfibh.sbh != nfibh.ebh)
1234 brelse(nfibh.ebh);
1235 brelse(nfibh.sbh);
1236 }
1237
1238 return retval;
1239}
1240
1241static struct dentry *udf_get_parent(struct dentry *child)
1242{
1243 struct kernel_lb_addr tloc;
1244 struct inode *inode = NULL;
1245 struct qstr dotdot = QSTR_INIT("..", 2);
1246 struct fileIdentDesc cfi;
1247 struct udf_fileident_bh fibh;
1248
1249 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1250 return ERR_PTR(-EACCES);
1251
1252 if (fibh.sbh != fibh.ebh)
1253 brelse(fibh.ebh);
1254 brelse(fibh.sbh);
1255
1256 tloc = lelb_to_cpu(cfi.icb.extLocation);
1257 inode = udf_iget(child->d_sb, &tloc);
1258 if (IS_ERR(inode))
1259 return ERR_CAST(inode);
1260
1261 return d_obtain_alias(inode);
1262}
1263
1264
1265static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1266 u16 partref, __u32 generation)
1267{
1268 struct inode *inode;
1269 struct kernel_lb_addr loc;
1270
1271 if (block == 0)
1272 return ERR_PTR(-ESTALE);
1273
1274 loc.logicalBlockNum = block;
1275 loc.partitionReferenceNum = partref;
1276 inode = udf_iget(sb, &loc);
1277
1278 if (IS_ERR(inode))
1279 return ERR_CAST(inode);
1280
1281 if (generation && inode->i_generation != generation) {
1282 iput(inode);
1283 return ERR_PTR(-ESTALE);
1284 }
1285 return d_obtain_alias(inode);
1286}
1287
1288static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1289 struct fid *fid, int fh_len, int fh_type)
1290{
1291 if (fh_len < 3 ||
1292 (fh_type != FILEID_UDF_WITH_PARENT &&
1293 fh_type != FILEID_UDF_WITHOUT_PARENT))
1294 return NULL;
1295
1296 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1297 fid->udf.generation);
1298}
1299
1300static struct dentry *udf_fh_to_parent(struct super_block *sb,
1301 struct fid *fid, int fh_len, int fh_type)
1302{
1303 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1304 return NULL;
1305
1306 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1307 fid->udf.parent_partref,
1308 fid->udf.parent_generation);
1309}
1310static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1311 struct inode *parent)
1312{
1313 int len = *lenp;
1314 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1315 struct fid *fid = (struct fid *)fh;
1316 int type = FILEID_UDF_WITHOUT_PARENT;
1317
1318 if (parent && (len < 5)) {
1319 *lenp = 5;
1320 return FILEID_INVALID;
1321 } else if (len < 3) {
1322 *lenp = 3;
1323 return FILEID_INVALID;
1324 }
1325
1326 *lenp = 3;
1327 fid->udf.block = location.logicalBlockNum;
1328 fid->udf.partref = location.partitionReferenceNum;
1329 fid->udf.parent_partref = 0;
1330 fid->udf.generation = inode->i_generation;
1331
1332 if (parent) {
1333 location = UDF_I(parent)->i_location;
1334 fid->udf.parent_block = location.logicalBlockNum;
1335 fid->udf.parent_partref = location.partitionReferenceNum;
1336 fid->udf.parent_generation = inode->i_generation;
1337 *lenp = 5;
1338 type = FILEID_UDF_WITH_PARENT;
1339 }
1340
1341 return type;
1342}
1343
1344const struct export_operations udf_export_ops = {
1345 .encode_fh = udf_encode_fh,
1346 .fh_to_dentry = udf_fh_to_dentry,
1347 .fh_to_parent = udf_fh_to_parent,
1348 .get_parent = udf_get_parent,
1349};
1350
1351const struct inode_operations udf_dir_inode_operations = {
1352 .lookup = udf_lookup,
1353 .create = udf_create,
1354 .link = udf_link,
1355 .unlink = udf_unlink,
1356 .symlink = udf_symlink,
1357 .mkdir = udf_mkdir,
1358 .rmdir = udf_rmdir,
1359 .mknod = udf_mknod,
1360 .rename = udf_rename,
1361 .tmpfile = udf_tmpfile,
1362};
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/sched.h>
31#include <linux/crc-itu-t.h>
32#include <linux/exportfs.h>
33
34static inline int udf_match(int len1, const unsigned char *name1, int len2,
35 const unsigned char *name2)
36{
37 if (len1 != len2)
38 return 0;
39
40 return !memcmp(name1, name2, len1);
41}
42
43int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
45 uint8_t *impuse, uint8_t *fileident)
46{
47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
48 uint16_t crc;
49 int offset;
50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
51 uint8_t lfi = cfi->lengthFileIdent;
52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
53 sizeof(struct fileIdentDesc);
54 int adinicb = 0;
55
56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
57 adinicb = 1;
58
59 offset = fibh->soffset + sizeof(struct fileIdentDesc);
60
61 if (impuse) {
62 if (adinicb || (offset + liu < 0)) {
63 memcpy((uint8_t *)sfi->impUse, impuse, liu);
64 } else if (offset >= 0) {
65 memcpy(fibh->ebh->b_data + offset, impuse, liu);
66 } else {
67 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
68 memcpy(fibh->ebh->b_data, impuse - offset,
69 liu + offset);
70 }
71 }
72
73 offset += liu;
74
75 if (fileident) {
76 if (adinicb || (offset + lfi < 0)) {
77 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
78 } else if (offset >= 0) {
79 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
80 } else {
81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
82 -offset);
83 memcpy(fibh->ebh->b_data, fileident - offset,
84 lfi + offset);
85 }
86 }
87
88 offset += lfi;
89
90 if (adinicb || (offset + padlen < 0)) {
91 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
92 } else if (offset >= 0) {
93 memset(fibh->ebh->b_data + offset, 0x00, padlen);
94 } else {
95 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
96 memset(fibh->ebh->b_data, 0x00, padlen + offset);
97 }
98
99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
100 sizeof(struct fileIdentDesc) - sizeof(struct tag));
101
102 if (fibh->sbh == fibh->ebh) {
103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
104 crclen + sizeof(struct tag) -
105 sizeof(struct fileIdentDesc));
106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
107 crc = crc_itu_t(crc, fibh->ebh->b_data +
108 sizeof(struct fileIdentDesc) +
109 fibh->soffset,
110 crclen + sizeof(struct tag) -
111 sizeof(struct fileIdentDesc));
112 } else {
113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
114 -fibh->soffset - sizeof(struct fileIdentDesc));
115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
116 }
117
118 cfi->descTag.descCRC = cpu_to_le16(crc);
119 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
121
122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
123 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
124 sizeof(struct fileIdentDesc));
125 } else {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
128 sizeof(struct fileIdentDesc) + fibh->soffset);
129 }
130
131 if (adinicb) {
132 mark_inode_dirty(inode);
133 } else {
134 if (fibh->sbh != fibh->ebh)
135 mark_buffer_dirty_inode(fibh->ebh, inode);
136 mark_buffer_dirty_inode(fibh->sbh, inode);
137 }
138 return 0;
139}
140
141/**
142 * udf_find_entry - find entry in given directory.
143 *
144 * @dir: directory inode to search in
145 * @child: qstr of the name
146 * @fibh: buffer head / inode with file identifier descriptor we found
147 * @cfi: found file identifier descriptor with given name
148 *
149 * This function searches in the directory @dir for a file name @child. When
150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
151 * directories) containing the file identifier descriptor (FID). In that case
152 * the function returns pointer to the FID in the buffer or inode - but note
153 * that FID may be split among two buffers (blocks) so accessing it via that
154 * pointer isn't easily possible. This pointer can be used only as an iterator
155 * for other directory manipulation functions. For inspection of the FID @cfi
156 * can be used - the found FID is copied there.
157 *
158 * Returns pointer to FID, NULL when nothing found, or error code.
159 */
160static struct fileIdentDesc *udf_find_entry(struct inode *dir,
161 const struct qstr *child,
162 struct udf_fileident_bh *fibh,
163 struct fileIdentDesc *cfi)
164{
165 struct fileIdentDesc *fi = NULL;
166 loff_t f_pos;
167 udf_pblk_t block;
168 int flen;
169 unsigned char *fname = NULL, *copy_name = NULL;
170 unsigned char *nameptr;
171 uint8_t lfi;
172 uint16_t liu;
173 loff_t size;
174 struct kernel_lb_addr eloc;
175 uint32_t elen;
176 sector_t offset;
177 struct extent_position epos = {};
178 struct udf_inode_info *dinfo = UDF_I(dir);
179 int isdotdot = child->len == 2 &&
180 child->name[0] == '.' && child->name[1] == '.';
181 struct super_block *sb = dir->i_sb;
182
183 size = udf_ext0_offset(dir) + dir->i_size;
184 f_pos = udf_ext0_offset(dir);
185
186 fibh->sbh = fibh->ebh = NULL;
187 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
188 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
189 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
190 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
191 fi = ERR_PTR(-EIO);
192 goto out_err;
193 }
194
195 block = udf_get_lb_pblock(sb, &eloc, offset);
196 if ((++offset << sb->s_blocksize_bits) < elen) {
197 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
198 epos.offset -= sizeof(struct short_ad);
199 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
200 epos.offset -= sizeof(struct long_ad);
201 } else
202 offset = 0;
203
204 fibh->sbh = fibh->ebh = udf_tread(sb, block);
205 if (!fibh->sbh) {
206 fi = ERR_PTR(-EIO);
207 goto out_err;
208 }
209 }
210
211 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
212 if (!fname) {
213 fi = ERR_PTR(-ENOMEM);
214 goto out_err;
215 }
216
217 while (f_pos < size) {
218 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
219 &elen, &offset);
220 if (!fi) {
221 fi = ERR_PTR(-EIO);
222 goto out_err;
223 }
224
225 liu = le16_to_cpu(cfi->lengthOfImpUse);
226 lfi = cfi->lengthFileIdent;
227
228 if (fibh->sbh == fibh->ebh) {
229 nameptr = fi->fileIdent + liu;
230 } else {
231 int poffset; /* Unpaded ending offset */
232
233 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
234 liu + lfi;
235
236 if (poffset >= lfi)
237 nameptr = (uint8_t *)(fibh->ebh->b_data +
238 poffset - lfi);
239 else {
240 if (!copy_name) {
241 copy_name = kmalloc(UDF_NAME_LEN,
242 GFP_NOFS);
243 if (!copy_name) {
244 fi = ERR_PTR(-ENOMEM);
245 goto out_err;
246 }
247 }
248 nameptr = copy_name;
249 memcpy(nameptr, fi->fileIdent + liu,
250 lfi - poffset);
251 memcpy(nameptr + lfi - poffset,
252 fibh->ebh->b_data, poffset);
253 }
254 }
255
256 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
257 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
258 continue;
259 }
260
261 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
262 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263 continue;
264 }
265
266 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
267 isdotdot)
268 goto out_ok;
269
270 if (!lfi)
271 continue;
272
273 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
274 if (flen < 0) {
275 fi = ERR_PTR(flen);
276 goto out_err;
277 }
278
279 if (udf_match(flen, fname, child->len, child->name))
280 goto out_ok;
281 }
282
283 fi = NULL;
284out_err:
285 if (fibh->sbh != fibh->ebh)
286 brelse(fibh->ebh);
287 brelse(fibh->sbh);
288out_ok:
289 brelse(epos.bh);
290 kfree(fname);
291 kfree(copy_name);
292
293 return fi;
294}
295
296static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
297 unsigned int flags)
298{
299 struct inode *inode = NULL;
300 struct fileIdentDesc cfi;
301 struct udf_fileident_bh fibh;
302 struct fileIdentDesc *fi;
303
304 if (dentry->d_name.len > UDF_NAME_LEN)
305 return ERR_PTR(-ENAMETOOLONG);
306
307 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
308 if (IS_ERR(fi))
309 return ERR_CAST(fi);
310
311 if (fi) {
312 struct kernel_lb_addr loc;
313
314 if (fibh.sbh != fibh.ebh)
315 brelse(fibh.ebh);
316 brelse(fibh.sbh);
317
318 loc = lelb_to_cpu(cfi.icb.extLocation);
319 inode = udf_iget(dir->i_sb, &loc);
320 if (IS_ERR(inode))
321 return ERR_CAST(inode);
322 }
323
324 return d_splice_alias(inode, dentry);
325}
326
327static struct fileIdentDesc *udf_add_entry(struct inode *dir,
328 struct dentry *dentry,
329 struct udf_fileident_bh *fibh,
330 struct fileIdentDesc *cfi, int *err)
331{
332 struct super_block *sb = dir->i_sb;
333 struct fileIdentDesc *fi = NULL;
334 unsigned char *name = NULL;
335 int namelen;
336 loff_t f_pos;
337 loff_t size = udf_ext0_offset(dir) + dir->i_size;
338 int nfidlen;
339 udf_pblk_t block;
340 struct kernel_lb_addr eloc;
341 uint32_t elen = 0;
342 sector_t offset;
343 struct extent_position epos = {};
344 struct udf_inode_info *dinfo;
345
346 fibh->sbh = fibh->ebh = NULL;
347 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
348 if (!name) {
349 *err = -ENOMEM;
350 goto out_err;
351 }
352
353 if (dentry) {
354 if (!dentry->d_name.len) {
355 *err = -EINVAL;
356 goto out_err;
357 }
358 namelen = udf_put_filename(sb, dentry->d_name.name,
359 dentry->d_name.len,
360 name, UDF_NAME_LEN_CS0);
361 if (!namelen) {
362 *err = -ENAMETOOLONG;
363 goto out_err;
364 }
365 } else {
366 namelen = 0;
367 }
368
369 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
370
371 f_pos = udf_ext0_offset(dir);
372
373 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
374 dinfo = UDF_I(dir);
375 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
376 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
377 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
378 block = udf_get_lb_pblock(dir->i_sb,
379 &dinfo->i_location, 0);
380 fibh->soffset = fibh->eoffset = sb->s_blocksize;
381 goto add;
382 }
383 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
384 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
385 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
386 epos.offset -= sizeof(struct short_ad);
387 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
388 epos.offset -= sizeof(struct long_ad);
389 } else
390 offset = 0;
391
392 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
393 if (!fibh->sbh) {
394 *err = -EIO;
395 goto out_err;
396 }
397
398 block = dinfo->i_location.logicalBlockNum;
399 }
400
401 while (f_pos < size) {
402 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
403 &elen, &offset);
404
405 if (!fi) {
406 *err = -EIO;
407 goto out_err;
408 }
409
410 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
411 if (udf_dir_entry_len(cfi) == nfidlen) {
412 cfi->descTag.tagSerialNum = cpu_to_le16(1);
413 cfi->fileVersionNum = cpu_to_le16(1);
414 cfi->fileCharacteristics = 0;
415 cfi->lengthFileIdent = namelen;
416 cfi->lengthOfImpUse = cpu_to_le16(0);
417 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
418 name))
419 goto out_ok;
420 else {
421 *err = -EIO;
422 goto out_err;
423 }
424 }
425 }
426 }
427
428add:
429 f_pos += nfidlen;
430
431 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
432 sb->s_blocksize - fibh->eoffset < nfidlen) {
433 brelse(epos.bh);
434 epos.bh = NULL;
435 fibh->soffset -= udf_ext0_offset(dir);
436 fibh->eoffset -= udf_ext0_offset(dir);
437 f_pos -= udf_ext0_offset(dir);
438 if (fibh->sbh != fibh->ebh)
439 brelse(fibh->ebh);
440 brelse(fibh->sbh);
441 fibh->sbh = fibh->ebh =
442 udf_expand_dir_adinicb(dir, &block, err);
443 if (!fibh->sbh)
444 goto out_err;
445 epos.block = dinfo->i_location;
446 epos.offset = udf_file_entry_alloc_offset(dir);
447 /* Load extent udf_expand_dir_adinicb() has created */
448 udf_current_aext(dir, &epos, &eloc, &elen, 1);
449 }
450
451 /* Entry fits into current block? */
452 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
453 fibh->soffset = fibh->eoffset;
454 fibh->eoffset += nfidlen;
455 if (fibh->sbh != fibh->ebh) {
456 brelse(fibh->sbh);
457 fibh->sbh = fibh->ebh;
458 }
459
460 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
461 block = dinfo->i_location.logicalBlockNum;
462 fi = (struct fileIdentDesc *)
463 (dinfo->i_ext.i_data +
464 fibh->soffset -
465 udf_ext0_offset(dir) +
466 dinfo->i_lenEAttr);
467 } else {
468 block = eloc.logicalBlockNum +
469 ((elen - 1) >>
470 dir->i_sb->s_blocksize_bits);
471 fi = (struct fileIdentDesc *)
472 (fibh->sbh->b_data + fibh->soffset);
473 }
474 } else {
475 /* Round up last extent in the file */
476 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
477 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
478 epos.offset -= sizeof(struct short_ad);
479 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
480 epos.offset -= sizeof(struct long_ad);
481 udf_write_aext(dir, &epos, &eloc, elen, 1);
482 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
483 - 1) & ~(sb->s_blocksize - 1);
484
485 fibh->soffset = fibh->eoffset - sb->s_blocksize;
486 fibh->eoffset += nfidlen - sb->s_blocksize;
487 if (fibh->sbh != fibh->ebh) {
488 brelse(fibh->sbh);
489 fibh->sbh = fibh->ebh;
490 }
491
492 block = eloc.logicalBlockNum + ((elen - 1) >>
493 dir->i_sb->s_blocksize_bits);
494 fibh->ebh = udf_bread(dir,
495 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
496 if (!fibh->ebh)
497 goto out_err;
498 /* Extents could have been merged, invalidate our position */
499 brelse(epos.bh);
500 epos.bh = NULL;
501 epos.block = dinfo->i_location;
502 epos.offset = udf_file_entry_alloc_offset(dir);
503
504 if (!fibh->soffset) {
505 /* Find the freshly allocated block */
506 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
507 (EXT_RECORDED_ALLOCATED >> 30))
508 ;
509 block = eloc.logicalBlockNum + ((elen - 1) >>
510 dir->i_sb->s_blocksize_bits);
511 brelse(fibh->sbh);
512 fibh->sbh = fibh->ebh;
513 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
514 } else {
515 fi = (struct fileIdentDesc *)
516 (fibh->sbh->b_data + sb->s_blocksize +
517 fibh->soffset);
518 }
519 }
520
521 memset(cfi, 0, sizeof(struct fileIdentDesc));
522 if (UDF_SB(sb)->s_udfrev >= 0x0200)
523 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
524 sizeof(struct tag));
525 else
526 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
527 sizeof(struct tag));
528 cfi->fileVersionNum = cpu_to_le16(1);
529 cfi->lengthFileIdent = namelen;
530 cfi->lengthOfImpUse = cpu_to_le16(0);
531 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
532 dir->i_size += nfidlen;
533 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
534 dinfo->i_lenAlloc += nfidlen;
535 else {
536 /* Find the last extent and truncate it to proper size */
537 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
538 (EXT_RECORDED_ALLOCATED >> 30))
539 ;
540 elen -= dinfo->i_lenExtents - dir->i_size;
541 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
542 epos.offset -= sizeof(struct short_ad);
543 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
544 epos.offset -= sizeof(struct long_ad);
545 udf_write_aext(dir, &epos, &eloc, elen, 1);
546 dinfo->i_lenExtents = dir->i_size;
547 }
548
549 mark_inode_dirty(dir);
550 goto out_ok;
551 } else {
552 *err = -EIO;
553 goto out_err;
554 }
555
556out_err:
557 fi = NULL;
558 if (fibh->sbh != fibh->ebh)
559 brelse(fibh->ebh);
560 brelse(fibh->sbh);
561out_ok:
562 brelse(epos.bh);
563 kfree(name);
564 return fi;
565}
566
567static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
568 struct udf_fileident_bh *fibh,
569 struct fileIdentDesc *cfi)
570{
571 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
572
573 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
574 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
575
576 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
577}
578
579static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
580{
581 struct udf_inode_info *iinfo = UDF_I(inode);
582 struct inode *dir = d_inode(dentry->d_parent);
583 struct udf_fileident_bh fibh;
584 struct fileIdentDesc cfi, *fi;
585 int err;
586
587 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
588 if (unlikely(!fi)) {
589 inode_dec_link_count(inode);
590 discard_new_inode(inode);
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 dir->i_ctime = dir->i_mtime = current_time(dir);
599 mark_inode_dirty(dir);
600 if (fibh.sbh != fibh.ebh)
601 brelse(fibh.ebh);
602 brelse(fibh.sbh);
603 d_instantiate_new(dentry, inode);
604
605 return 0;
606}
607
608static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
609 bool excl)
610{
611 struct inode *inode = udf_new_inode(dir, mode);
612
613 if (IS_ERR(inode))
614 return PTR_ERR(inode);
615
616 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
617 inode->i_data.a_ops = &udf_adinicb_aops;
618 else
619 inode->i_data.a_ops = &udf_aops;
620 inode->i_op = &udf_file_inode_operations;
621 inode->i_fop = &udf_file_operations;
622 mark_inode_dirty(inode);
623
624 return udf_add_nondir(dentry, inode);
625}
626
627static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
628{
629 struct inode *inode = udf_new_inode(dir, mode);
630
631 if (IS_ERR(inode))
632 return PTR_ERR(inode);
633
634 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
635 inode->i_data.a_ops = &udf_adinicb_aops;
636 else
637 inode->i_data.a_ops = &udf_aops;
638 inode->i_op = &udf_file_inode_operations;
639 inode->i_fop = &udf_file_operations;
640 mark_inode_dirty(inode);
641 d_tmpfile(dentry, inode);
642 unlock_new_inode(inode);
643 return 0;
644}
645
646static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
647 dev_t rdev)
648{
649 struct inode *inode;
650
651 if (!old_valid_dev(rdev))
652 return -EINVAL;
653
654 inode = udf_new_inode(dir, mode);
655 if (IS_ERR(inode))
656 return PTR_ERR(inode);
657
658 init_special_inode(inode, mode, rdev);
659 return udf_add_nondir(dentry, inode);
660}
661
662static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
663{
664 struct inode *inode;
665 struct udf_fileident_bh fibh;
666 struct fileIdentDesc cfi, *fi;
667 int err;
668 struct udf_inode_info *dinfo = UDF_I(dir);
669 struct udf_inode_info *iinfo;
670
671 inode = udf_new_inode(dir, S_IFDIR | mode);
672 if (IS_ERR(inode))
673 return PTR_ERR(inode);
674
675 iinfo = UDF_I(inode);
676 inode->i_op = &udf_dir_inode_operations;
677 inode->i_fop = &udf_dir_operations;
678 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
679 if (!fi) {
680 inode_dec_link_count(inode);
681 discard_new_inode(inode);
682 goto out;
683 }
684 set_nlink(inode, 2);
685 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
686 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
687 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
688 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
689 cfi.fileCharacteristics =
690 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
691 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
692 brelse(fibh.sbh);
693 mark_inode_dirty(inode);
694
695 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
696 if (!fi) {
697 clear_nlink(inode);
698 mark_inode_dirty(inode);
699 discard_new_inode(inode);
700 goto out;
701 }
702 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
703 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
704 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
705 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
706 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
707 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
708 inc_nlink(dir);
709 dir->i_ctime = dir->i_mtime = current_time(dir);
710 mark_inode_dirty(dir);
711 d_instantiate_new(dentry, inode);
712 if (fibh.sbh != fibh.ebh)
713 brelse(fibh.ebh);
714 brelse(fibh.sbh);
715 err = 0;
716
717out:
718 return err;
719}
720
721static int empty_dir(struct inode *dir)
722{
723 struct fileIdentDesc *fi, cfi;
724 struct udf_fileident_bh fibh;
725 loff_t f_pos;
726 loff_t size = udf_ext0_offset(dir) + dir->i_size;
727 udf_pblk_t block;
728 struct kernel_lb_addr eloc;
729 uint32_t elen;
730 sector_t offset;
731 struct extent_position epos = {};
732 struct udf_inode_info *dinfo = UDF_I(dir);
733
734 f_pos = udf_ext0_offset(dir);
735 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
736
737 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
738 fibh.sbh = fibh.ebh = NULL;
739 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
740 &epos, &eloc, &elen, &offset) ==
741 (EXT_RECORDED_ALLOCATED >> 30)) {
742 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
743 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
744 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
745 epos.offset -= sizeof(struct short_ad);
746 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
747 epos.offset -= sizeof(struct long_ad);
748 } else
749 offset = 0;
750
751 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
752 if (!fibh.sbh) {
753 brelse(epos.bh);
754 return 0;
755 }
756 } else {
757 brelse(epos.bh);
758 return 0;
759 }
760
761 while (f_pos < size) {
762 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
763 &elen, &offset);
764 if (!fi) {
765 if (fibh.sbh != fibh.ebh)
766 brelse(fibh.ebh);
767 brelse(fibh.sbh);
768 brelse(epos.bh);
769 return 0;
770 }
771
772 if (cfi.lengthFileIdent &&
773 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
774 if (fibh.sbh != fibh.ebh)
775 brelse(fibh.ebh);
776 brelse(fibh.sbh);
777 brelse(epos.bh);
778 return 0;
779 }
780 }
781
782 if (fibh.sbh != fibh.ebh)
783 brelse(fibh.ebh);
784 brelse(fibh.sbh);
785 brelse(epos.bh);
786
787 return 1;
788}
789
790static int udf_rmdir(struct inode *dir, struct dentry *dentry)
791{
792 int retval;
793 struct inode *inode = d_inode(dentry);
794 struct udf_fileident_bh fibh;
795 struct fileIdentDesc *fi, cfi;
796 struct kernel_lb_addr tloc;
797
798 retval = -ENOENT;
799 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
800 if (IS_ERR_OR_NULL(fi)) {
801 if (fi)
802 retval = PTR_ERR(fi);
803 goto out;
804 }
805
806 retval = -EIO;
807 tloc = lelb_to_cpu(cfi.icb.extLocation);
808 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
809 goto end_rmdir;
810 retval = -ENOTEMPTY;
811 if (!empty_dir(inode))
812 goto end_rmdir;
813 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
814 if (retval)
815 goto end_rmdir;
816 if (inode->i_nlink != 2)
817 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
818 inode->i_nlink);
819 clear_nlink(inode);
820 inode->i_size = 0;
821 inode_dec_link_count(dir);
822 inode->i_ctime = dir->i_ctime = dir->i_mtime =
823 current_time(inode);
824 mark_inode_dirty(dir);
825
826end_rmdir:
827 if (fibh.sbh != fibh.ebh)
828 brelse(fibh.ebh);
829 brelse(fibh.sbh);
830
831out:
832 return retval;
833}
834
835static int udf_unlink(struct inode *dir, struct dentry *dentry)
836{
837 int retval;
838 struct inode *inode = d_inode(dentry);
839 struct udf_fileident_bh fibh;
840 struct fileIdentDesc *fi;
841 struct fileIdentDesc cfi;
842 struct kernel_lb_addr tloc;
843
844 retval = -ENOENT;
845 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
846
847 if (IS_ERR_OR_NULL(fi)) {
848 if (fi)
849 retval = PTR_ERR(fi);
850 goto out;
851 }
852
853 retval = -EIO;
854 tloc = lelb_to_cpu(cfi.icb.extLocation);
855 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
856 goto end_unlink;
857
858 if (!inode->i_nlink) {
859 udf_debug("Deleting nonexistent file (%lu), %u\n",
860 inode->i_ino, inode->i_nlink);
861 set_nlink(inode, 1);
862 }
863 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
864 if (retval)
865 goto end_unlink;
866 dir->i_ctime = dir->i_mtime = current_time(dir);
867 mark_inode_dirty(dir);
868 inode_dec_link_count(inode);
869 inode->i_ctime = dir->i_ctime;
870 retval = 0;
871
872end_unlink:
873 if (fibh.sbh != fibh.ebh)
874 brelse(fibh.ebh);
875 brelse(fibh.sbh);
876
877out:
878 return retval;
879}
880
881static int udf_symlink(struct inode *dir, struct dentry *dentry,
882 const char *symname)
883{
884 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
885 struct pathComponent *pc;
886 const char *compstart;
887 struct extent_position epos = {};
888 int eoffset, elen = 0;
889 uint8_t *ea;
890 int err;
891 udf_pblk_t block;
892 unsigned char *name = NULL;
893 int namelen;
894 struct udf_inode_info *iinfo;
895 struct super_block *sb = dir->i_sb;
896
897 if (IS_ERR(inode))
898 return PTR_ERR(inode);
899
900 iinfo = UDF_I(inode);
901 down_write(&iinfo->i_data_sem);
902 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
903 if (!name) {
904 err = -ENOMEM;
905 goto out_no_entry;
906 }
907
908 inode->i_data.a_ops = &udf_symlink_aops;
909 inode->i_op = &udf_symlink_inode_operations;
910 inode_nohighmem(inode);
911
912 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
913 struct kernel_lb_addr eloc;
914 uint32_t bsize;
915
916 block = udf_new_block(sb, inode,
917 iinfo->i_location.partitionReferenceNum,
918 iinfo->i_location.logicalBlockNum, &err);
919 if (!block)
920 goto out_no_entry;
921 epos.block = iinfo->i_location;
922 epos.offset = udf_file_entry_alloc_offset(inode);
923 epos.bh = NULL;
924 eloc.logicalBlockNum = block;
925 eloc.partitionReferenceNum =
926 iinfo->i_location.partitionReferenceNum;
927 bsize = sb->s_blocksize;
928 iinfo->i_lenExtents = bsize;
929 udf_add_aext(inode, &epos, &eloc, bsize, 0);
930 brelse(epos.bh);
931
932 block = udf_get_pblock(sb, block,
933 iinfo->i_location.partitionReferenceNum,
934 0);
935 epos.bh = udf_tgetblk(sb, block);
936 lock_buffer(epos.bh);
937 memset(epos.bh->b_data, 0x00, bsize);
938 set_buffer_uptodate(epos.bh);
939 unlock_buffer(epos.bh);
940 mark_buffer_dirty_inode(epos.bh, inode);
941 ea = epos.bh->b_data + udf_ext0_offset(inode);
942 } else
943 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
944
945 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
946 pc = (struct pathComponent *)ea;
947
948 if (*symname == '/') {
949 do {
950 symname++;
951 } while (*symname == '/');
952
953 pc->componentType = 1;
954 pc->lengthComponentIdent = 0;
955 pc->componentFileVersionNum = 0;
956 elen += sizeof(struct pathComponent);
957 }
958
959 err = -ENAMETOOLONG;
960
961 while (*symname) {
962 if (elen + sizeof(struct pathComponent) > eoffset)
963 goto out_no_entry;
964
965 pc = (struct pathComponent *)(ea + elen);
966
967 compstart = symname;
968
969 do {
970 symname++;
971 } while (*symname && *symname != '/');
972
973 pc->componentType = 5;
974 pc->lengthComponentIdent = 0;
975 pc->componentFileVersionNum = 0;
976 if (compstart[0] == '.') {
977 if ((symname - compstart) == 1)
978 pc->componentType = 4;
979 else if ((symname - compstart) == 2 &&
980 compstart[1] == '.')
981 pc->componentType = 3;
982 }
983
984 if (pc->componentType == 5) {
985 namelen = udf_put_filename(sb, compstart,
986 symname - compstart,
987 name, UDF_NAME_LEN_CS0);
988 if (!namelen)
989 goto out_no_entry;
990
991 if (elen + sizeof(struct pathComponent) + namelen >
992 eoffset)
993 goto out_no_entry;
994 else
995 pc->lengthComponentIdent = namelen;
996
997 memcpy(pc->componentIdent, name, namelen);
998 }
999
1000 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1001
1002 if (*symname) {
1003 do {
1004 symname++;
1005 } while (*symname == '/');
1006 }
1007 }
1008
1009 brelse(epos.bh);
1010 inode->i_size = elen;
1011 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1012 iinfo->i_lenAlloc = inode->i_size;
1013 else
1014 udf_truncate_tail_extent(inode);
1015 mark_inode_dirty(inode);
1016 up_write(&iinfo->i_data_sem);
1017
1018 err = udf_add_nondir(dentry, inode);
1019out:
1020 kfree(name);
1021 return err;
1022
1023out_no_entry:
1024 up_write(&iinfo->i_data_sem);
1025 inode_dec_link_count(inode);
1026 discard_new_inode(inode);
1027 goto out;
1028}
1029
1030static int udf_link(struct dentry *old_dentry, struct inode *dir,
1031 struct dentry *dentry)
1032{
1033 struct inode *inode = d_inode(old_dentry);
1034 struct udf_fileident_bh fibh;
1035 struct fileIdentDesc cfi, *fi;
1036 int err;
1037
1038 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1039 if (!fi) {
1040 return err;
1041 }
1042 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1043 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1044 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1045 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1046 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1047 }
1048 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1049 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1050 mark_inode_dirty(dir);
1051
1052 if (fibh.sbh != fibh.ebh)
1053 brelse(fibh.ebh);
1054 brelse(fibh.sbh);
1055 inc_nlink(inode);
1056 inode->i_ctime = current_time(inode);
1057 mark_inode_dirty(inode);
1058 dir->i_ctime = dir->i_mtime = current_time(dir);
1059 mark_inode_dirty(dir);
1060 ihold(inode);
1061 d_instantiate(dentry, inode);
1062
1063 return 0;
1064}
1065
1066/* Anybody can rename anything with this: the permission checks are left to the
1067 * higher-level routines.
1068 */
1069static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1070 struct inode *new_dir, struct dentry *new_dentry,
1071 unsigned int flags)
1072{
1073 struct inode *old_inode = d_inode(old_dentry);
1074 struct inode *new_inode = d_inode(new_dentry);
1075 struct udf_fileident_bh ofibh, nfibh;
1076 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1077 struct fileIdentDesc ocfi, ncfi;
1078 struct buffer_head *dir_bh = NULL;
1079 int retval = -ENOENT;
1080 struct kernel_lb_addr tloc;
1081 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1082
1083 if (flags & ~RENAME_NOREPLACE)
1084 return -EINVAL;
1085
1086 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1087 if (IS_ERR(ofi)) {
1088 retval = PTR_ERR(ofi);
1089 goto end_rename;
1090 }
1091
1092 if (ofibh.sbh != ofibh.ebh)
1093 brelse(ofibh.ebh);
1094
1095 brelse(ofibh.sbh);
1096 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1097 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1098 != old_inode->i_ino)
1099 goto end_rename;
1100
1101 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1102 if (IS_ERR(nfi)) {
1103 retval = PTR_ERR(nfi);
1104 goto end_rename;
1105 }
1106 if (nfi && !new_inode) {
1107 if (nfibh.sbh != nfibh.ebh)
1108 brelse(nfibh.ebh);
1109 brelse(nfibh.sbh);
1110 nfi = NULL;
1111 }
1112 if (S_ISDIR(old_inode->i_mode)) {
1113 int offset = udf_ext0_offset(old_inode);
1114
1115 if (new_inode) {
1116 retval = -ENOTEMPTY;
1117 if (!empty_dir(new_inode))
1118 goto end_rename;
1119 }
1120 retval = -EIO;
1121 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1122 dir_fi = udf_get_fileident(
1123 old_iinfo->i_ext.i_data -
1124 (old_iinfo->i_efe ?
1125 sizeof(struct extendedFileEntry) :
1126 sizeof(struct fileEntry)),
1127 old_inode->i_sb->s_blocksize, &offset);
1128 } else {
1129 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1130 if (!dir_bh)
1131 goto end_rename;
1132 dir_fi = udf_get_fileident(dir_bh->b_data,
1133 old_inode->i_sb->s_blocksize, &offset);
1134 }
1135 if (!dir_fi)
1136 goto end_rename;
1137 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1138 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1139 old_dir->i_ino)
1140 goto end_rename;
1141 }
1142 if (!nfi) {
1143 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1144 &retval);
1145 if (!nfi)
1146 goto end_rename;
1147 }
1148
1149 /*
1150 * Like most other Unix systems, set the ctime for inodes on a
1151 * rename.
1152 */
1153 old_inode->i_ctime = current_time(old_inode);
1154 mark_inode_dirty(old_inode);
1155
1156 /*
1157 * ok, that's it
1158 */
1159 ncfi.fileVersionNum = ocfi.fileVersionNum;
1160 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1161 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1162 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1163
1164 /* The old fid may have moved - find it again */
1165 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1166 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1167
1168 if (new_inode) {
1169 new_inode->i_ctime = current_time(new_inode);
1170 inode_dec_link_count(new_inode);
1171 }
1172 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1173 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1174 mark_inode_dirty(old_dir);
1175 mark_inode_dirty(new_dir);
1176
1177 if (dir_fi) {
1178 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1179 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1180 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1181 mark_inode_dirty(old_inode);
1182 else
1183 mark_buffer_dirty_inode(dir_bh, old_inode);
1184
1185 inode_dec_link_count(old_dir);
1186 if (new_inode)
1187 inode_dec_link_count(new_inode);
1188 else {
1189 inc_nlink(new_dir);
1190 mark_inode_dirty(new_dir);
1191 }
1192 }
1193
1194 if (ofi) {
1195 if (ofibh.sbh != ofibh.ebh)
1196 brelse(ofibh.ebh);
1197 brelse(ofibh.sbh);
1198 }
1199
1200 retval = 0;
1201
1202end_rename:
1203 brelse(dir_bh);
1204 if (nfi) {
1205 if (nfibh.sbh != nfibh.ebh)
1206 brelse(nfibh.ebh);
1207 brelse(nfibh.sbh);
1208 }
1209
1210 return retval;
1211}
1212
1213static struct dentry *udf_get_parent(struct dentry *child)
1214{
1215 struct kernel_lb_addr tloc;
1216 struct inode *inode = NULL;
1217 struct qstr dotdot = QSTR_INIT("..", 2);
1218 struct fileIdentDesc cfi;
1219 struct udf_fileident_bh fibh;
1220
1221 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1222 return ERR_PTR(-EACCES);
1223
1224 if (fibh.sbh != fibh.ebh)
1225 brelse(fibh.ebh);
1226 brelse(fibh.sbh);
1227
1228 tloc = lelb_to_cpu(cfi.icb.extLocation);
1229 inode = udf_iget(child->d_sb, &tloc);
1230 if (IS_ERR(inode))
1231 return ERR_CAST(inode);
1232
1233 return d_obtain_alias(inode);
1234}
1235
1236
1237static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1238 u16 partref, __u32 generation)
1239{
1240 struct inode *inode;
1241 struct kernel_lb_addr loc;
1242
1243 if (block == 0)
1244 return ERR_PTR(-ESTALE);
1245
1246 loc.logicalBlockNum = block;
1247 loc.partitionReferenceNum = partref;
1248 inode = udf_iget(sb, &loc);
1249
1250 if (IS_ERR(inode))
1251 return ERR_CAST(inode);
1252
1253 if (generation && inode->i_generation != generation) {
1254 iput(inode);
1255 return ERR_PTR(-ESTALE);
1256 }
1257 return d_obtain_alias(inode);
1258}
1259
1260static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1261 struct fid *fid, int fh_len, int fh_type)
1262{
1263 if (fh_len < 3 ||
1264 (fh_type != FILEID_UDF_WITH_PARENT &&
1265 fh_type != FILEID_UDF_WITHOUT_PARENT))
1266 return NULL;
1267
1268 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1269 fid->udf.generation);
1270}
1271
1272static struct dentry *udf_fh_to_parent(struct super_block *sb,
1273 struct fid *fid, int fh_len, int fh_type)
1274{
1275 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1276 return NULL;
1277
1278 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1279 fid->udf.parent_partref,
1280 fid->udf.parent_generation);
1281}
1282static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1283 struct inode *parent)
1284{
1285 int len = *lenp;
1286 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1287 struct fid *fid = (struct fid *)fh;
1288 int type = FILEID_UDF_WITHOUT_PARENT;
1289
1290 if (parent && (len < 5)) {
1291 *lenp = 5;
1292 return FILEID_INVALID;
1293 } else if (len < 3) {
1294 *lenp = 3;
1295 return FILEID_INVALID;
1296 }
1297
1298 *lenp = 3;
1299 fid->udf.block = location.logicalBlockNum;
1300 fid->udf.partref = location.partitionReferenceNum;
1301 fid->udf.parent_partref = 0;
1302 fid->udf.generation = inode->i_generation;
1303
1304 if (parent) {
1305 location = UDF_I(parent)->i_location;
1306 fid->udf.parent_block = location.logicalBlockNum;
1307 fid->udf.parent_partref = location.partitionReferenceNum;
1308 fid->udf.parent_generation = inode->i_generation;
1309 *lenp = 5;
1310 type = FILEID_UDF_WITH_PARENT;
1311 }
1312
1313 return type;
1314}
1315
1316const struct export_operations udf_export_ops = {
1317 .encode_fh = udf_encode_fh,
1318 .fh_to_dentry = udf_fh_to_dentry,
1319 .fh_to_parent = udf_fh_to_parent,
1320 .get_parent = udf_get_parent,
1321};
1322
1323const struct inode_operations udf_dir_inode_operations = {
1324 .lookup = udf_lookup,
1325 .create = udf_create,
1326 .link = udf_link,
1327 .unlink = udf_unlink,
1328 .symlink = udf_symlink,
1329 .mkdir = udf_mkdir,
1330 .rmdir = udf_rmdir,
1331 .mknod = udf_mknod,
1332 .rename = udf_rename,
1333 .tmpfile = udf_tmpfile,
1334};