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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
34 static 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
43 int 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 */
160 static 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;
284 out_err:
285 if (fibh->sbh != fibh->ebh)
286 brelse(fibh->ebh);
287 brelse(fibh->sbh);
288 out_ok:
289 brelse(epos.bh);
290 kfree(fname);
291 kfree(copy_name);
292
293 return fi;
294 }
295
296 static 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 #ifdef UDF_RECOVERY
308 /* temporary shorthand for specifying files by inode number */
309 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
310 struct kernel_lb_addr lb = {
311 .logicalBlockNum = 0,
312 .partitionReferenceNum =
313 simple_strtoul(dentry->d_name.name + 3,
314 NULL, 0),
315 };
316 inode = udf_iget(dir->i_sb, lb);
317 if (IS_ERR(inode))
318 return inode;
319 } else
320 #endif /* UDF_RECOVERY */
321
322 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
323 if (IS_ERR(fi))
324 return ERR_CAST(fi);
325
326 if (fi) {
327 struct kernel_lb_addr loc;
328
329 if (fibh.sbh != fibh.ebh)
330 brelse(fibh.ebh);
331 brelse(fibh.sbh);
332
333 loc = lelb_to_cpu(cfi.icb.extLocation);
334 inode = udf_iget(dir->i_sb, &loc);
335 if (IS_ERR(inode))
336 return ERR_CAST(inode);
337 }
338
339 return d_splice_alias(inode, dentry);
340 }
341
342 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
343 struct dentry *dentry,
344 struct udf_fileident_bh *fibh,
345 struct fileIdentDesc *cfi, int *err)
346 {
347 struct super_block *sb = dir->i_sb;
348 struct fileIdentDesc *fi = NULL;
349 unsigned char *name = NULL;
350 int namelen;
351 loff_t f_pos;
352 loff_t size = udf_ext0_offset(dir) + dir->i_size;
353 int nfidlen;
354 uint8_t lfi;
355 uint16_t liu;
356 udf_pblk_t block;
357 struct kernel_lb_addr eloc;
358 uint32_t elen = 0;
359 sector_t offset;
360 struct extent_position epos = {};
361 struct udf_inode_info *dinfo;
362
363 fibh->sbh = fibh->ebh = NULL;
364 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
365 if (!name) {
366 *err = -ENOMEM;
367 goto out_err;
368 }
369
370 if (dentry) {
371 if (!dentry->d_name.len) {
372 *err = -EINVAL;
373 goto out_err;
374 }
375 namelen = udf_put_filename(sb, dentry->d_name.name,
376 dentry->d_name.len,
377 name, UDF_NAME_LEN_CS0);
378 if (!namelen) {
379 *err = -ENAMETOOLONG;
380 goto out_err;
381 }
382 } else {
383 namelen = 0;
384 }
385
386 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
387
388 f_pos = udf_ext0_offset(dir);
389
390 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
391 dinfo = UDF_I(dir);
392 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
393 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
394 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
395 block = udf_get_lb_pblock(dir->i_sb,
396 &dinfo->i_location, 0);
397 fibh->soffset = fibh->eoffset = sb->s_blocksize;
398 goto add;
399 }
400 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
401 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
402 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
403 epos.offset -= sizeof(struct short_ad);
404 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
405 epos.offset -= sizeof(struct long_ad);
406 } else
407 offset = 0;
408
409 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
410 if (!fibh->sbh) {
411 *err = -EIO;
412 goto out_err;
413 }
414
415 block = dinfo->i_location.logicalBlockNum;
416 }
417
418 while (f_pos < size) {
419 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
420 &elen, &offset);
421
422 if (!fi) {
423 *err = -EIO;
424 goto out_err;
425 }
426
427 liu = le16_to_cpu(cfi->lengthOfImpUse);
428 lfi = cfi->lengthFileIdent;
429
430 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
431 if (((sizeof(struct fileIdentDesc) +
432 liu + lfi + 3) & ~3) == nfidlen) {
433 cfi->descTag.tagSerialNum = cpu_to_le16(1);
434 cfi->fileVersionNum = cpu_to_le16(1);
435 cfi->fileCharacteristics = 0;
436 cfi->lengthFileIdent = namelen;
437 cfi->lengthOfImpUse = cpu_to_le16(0);
438 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
439 name))
440 goto out_ok;
441 else {
442 *err = -EIO;
443 goto out_err;
444 }
445 }
446 }
447 }
448
449 add:
450 f_pos += nfidlen;
451
452 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
453 sb->s_blocksize - fibh->eoffset < nfidlen) {
454 brelse(epos.bh);
455 epos.bh = NULL;
456 fibh->soffset -= udf_ext0_offset(dir);
457 fibh->eoffset -= udf_ext0_offset(dir);
458 f_pos -= udf_ext0_offset(dir);
459 if (fibh->sbh != fibh->ebh)
460 brelse(fibh->ebh);
461 brelse(fibh->sbh);
462 fibh->sbh = fibh->ebh =
463 udf_expand_dir_adinicb(dir, &block, err);
464 if (!fibh->sbh)
465 goto out_err;
466 epos.block = dinfo->i_location;
467 epos.offset = udf_file_entry_alloc_offset(dir);
468 /* Load extent udf_expand_dir_adinicb() has created */
469 udf_current_aext(dir, &epos, &eloc, &elen, 1);
470 }
471
472 /* Entry fits into current block? */
473 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
474 fibh->soffset = fibh->eoffset;
475 fibh->eoffset += nfidlen;
476 if (fibh->sbh != fibh->ebh) {
477 brelse(fibh->sbh);
478 fibh->sbh = fibh->ebh;
479 }
480
481 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
482 block = dinfo->i_location.logicalBlockNum;
483 fi = (struct fileIdentDesc *)
484 (dinfo->i_ext.i_data +
485 fibh->soffset -
486 udf_ext0_offset(dir) +
487 dinfo->i_lenEAttr);
488 } else {
489 block = eloc.logicalBlockNum +
490 ((elen - 1) >>
491 dir->i_sb->s_blocksize_bits);
492 fi = (struct fileIdentDesc *)
493 (fibh->sbh->b_data + fibh->soffset);
494 }
495 } else {
496 /* Round up last extent in the file */
497 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
498 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
499 epos.offset -= sizeof(struct short_ad);
500 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
501 epos.offset -= sizeof(struct long_ad);
502 udf_write_aext(dir, &epos, &eloc, elen, 1);
503 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
504 - 1) & ~(sb->s_blocksize - 1);
505
506 fibh->soffset = fibh->eoffset - sb->s_blocksize;
507 fibh->eoffset += nfidlen - sb->s_blocksize;
508 if (fibh->sbh != fibh->ebh) {
509 brelse(fibh->sbh);
510 fibh->sbh = fibh->ebh;
511 }
512
513 block = eloc.logicalBlockNum + ((elen - 1) >>
514 dir->i_sb->s_blocksize_bits);
515 fibh->ebh = udf_bread(dir,
516 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
517 if (!fibh->ebh)
518 goto out_err;
519 /* Extents could have been merged, invalidate our position */
520 brelse(epos.bh);
521 epos.bh = NULL;
522 epos.block = dinfo->i_location;
523 epos.offset = udf_file_entry_alloc_offset(dir);
524
525 if (!fibh->soffset) {
526 /* Find the freshly allocated block */
527 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
528 (EXT_RECORDED_ALLOCATED >> 30))
529 ;
530 block = eloc.logicalBlockNum + ((elen - 1) >>
531 dir->i_sb->s_blocksize_bits);
532 brelse(fibh->sbh);
533 fibh->sbh = fibh->ebh;
534 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
535 } else {
536 fi = (struct fileIdentDesc *)
537 (fibh->sbh->b_data + sb->s_blocksize +
538 fibh->soffset);
539 }
540 }
541
542 memset(cfi, 0, sizeof(struct fileIdentDesc));
543 if (UDF_SB(sb)->s_udfrev >= 0x0200)
544 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
545 sizeof(struct tag));
546 else
547 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
548 sizeof(struct tag));
549 cfi->fileVersionNum = cpu_to_le16(1);
550 cfi->lengthFileIdent = namelen;
551 cfi->lengthOfImpUse = cpu_to_le16(0);
552 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
553 dir->i_size += nfidlen;
554 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
555 dinfo->i_lenAlloc += nfidlen;
556 else {
557 /* Find the last extent and truncate it to proper size */
558 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
559 (EXT_RECORDED_ALLOCATED >> 30))
560 ;
561 elen -= dinfo->i_lenExtents - dir->i_size;
562 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
563 epos.offset -= sizeof(struct short_ad);
564 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
565 epos.offset -= sizeof(struct long_ad);
566 udf_write_aext(dir, &epos, &eloc, elen, 1);
567 dinfo->i_lenExtents = dir->i_size;
568 }
569
570 mark_inode_dirty(dir);
571 goto out_ok;
572 } else {
573 *err = -EIO;
574 goto out_err;
575 }
576
577 out_err:
578 fi = NULL;
579 if (fibh->sbh != fibh->ebh)
580 brelse(fibh->ebh);
581 brelse(fibh->sbh);
582 out_ok:
583 brelse(epos.bh);
584 kfree(name);
585 return fi;
586 }
587
588 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
589 struct udf_fileident_bh *fibh,
590 struct fileIdentDesc *cfi)
591 {
592 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
593
594 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
595 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
596
597 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
598 }
599
600 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
601 {
602 struct udf_inode_info *iinfo = UDF_I(inode);
603 struct inode *dir = d_inode(dentry->d_parent);
604 struct udf_fileident_bh fibh;
605 struct fileIdentDesc cfi, *fi;
606 int err;
607
608 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
609 if (unlikely(!fi)) {
610 inode_dec_link_count(inode);
611 unlock_new_inode(inode);
612 iput(inode);
613 return err;
614 }
615 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
616 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
617 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
618 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
619 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
620 dir->i_ctime = dir->i_mtime = current_time(dir);
621 mark_inode_dirty(dir);
622 if (fibh.sbh != fibh.ebh)
623 brelse(fibh.ebh);
624 brelse(fibh.sbh);
625 d_instantiate_new(dentry, inode);
626
627 return 0;
628 }
629
630 static 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
649 static 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
668 static 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
684 static 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 d_instantiate_new(dentry, inode);
736 if (fibh.sbh != fibh.ebh)
737 brelse(fibh.ebh);
738 brelse(fibh.sbh);
739 err = 0;
740
741 out:
742 return err;
743 }
744
745 static int empty_dir(struct inode *dir)
746 {
747 struct fileIdentDesc *fi, cfi;
748 struct udf_fileident_bh fibh;
749 loff_t f_pos;
750 loff_t size = udf_ext0_offset(dir) + dir->i_size;
751 udf_pblk_t block;
752 struct kernel_lb_addr eloc;
753 uint32_t elen;
754 sector_t offset;
755 struct extent_position epos = {};
756 struct udf_inode_info *dinfo = UDF_I(dir);
757
758 f_pos = udf_ext0_offset(dir);
759 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
760
761 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
762 fibh.sbh = fibh.ebh = NULL;
763 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
764 &epos, &eloc, &elen, &offset) ==
765 (EXT_RECORDED_ALLOCATED >> 30)) {
766 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
767 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
768 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
769 epos.offset -= sizeof(struct short_ad);
770 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
771 epos.offset -= sizeof(struct long_ad);
772 } else
773 offset = 0;
774
775 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
776 if (!fibh.sbh) {
777 brelse(epos.bh);
778 return 0;
779 }
780 } else {
781 brelse(epos.bh);
782 return 0;
783 }
784
785 while (f_pos < size) {
786 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
787 &elen, &offset);
788 if (!fi) {
789 if (fibh.sbh != fibh.ebh)
790 brelse(fibh.ebh);
791 brelse(fibh.sbh);
792 brelse(epos.bh);
793 return 0;
794 }
795
796 if (cfi.lengthFileIdent &&
797 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
798 if (fibh.sbh != fibh.ebh)
799 brelse(fibh.ebh);
800 brelse(fibh.sbh);
801 brelse(epos.bh);
802 return 0;
803 }
804 }
805
806 if (fibh.sbh != fibh.ebh)
807 brelse(fibh.ebh);
808 brelse(fibh.sbh);
809 brelse(epos.bh);
810
811 return 1;
812 }
813
814 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
815 {
816 int retval;
817 struct inode *inode = d_inode(dentry);
818 struct udf_fileident_bh fibh;
819 struct fileIdentDesc *fi, cfi;
820 struct kernel_lb_addr tloc;
821
822 retval = -ENOENT;
823 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
824 if (IS_ERR_OR_NULL(fi)) {
825 if (fi)
826 retval = PTR_ERR(fi);
827 goto out;
828 }
829
830 retval = -EIO;
831 tloc = lelb_to_cpu(cfi.icb.extLocation);
832 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
833 goto end_rmdir;
834 retval = -ENOTEMPTY;
835 if (!empty_dir(inode))
836 goto end_rmdir;
837 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
838 if (retval)
839 goto end_rmdir;
840 if (inode->i_nlink != 2)
841 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
842 inode->i_nlink);
843 clear_nlink(inode);
844 inode->i_size = 0;
845 inode_dec_link_count(dir);
846 inode->i_ctime = dir->i_ctime = dir->i_mtime =
847 current_time(inode);
848 mark_inode_dirty(dir);
849
850 end_rmdir:
851 if (fibh.sbh != fibh.ebh)
852 brelse(fibh.ebh);
853 brelse(fibh.sbh);
854
855 out:
856 return retval;
857 }
858
859 static int udf_unlink(struct inode *dir, struct dentry *dentry)
860 {
861 int retval;
862 struct inode *inode = d_inode(dentry);
863 struct udf_fileident_bh fibh;
864 struct fileIdentDesc *fi;
865 struct fileIdentDesc cfi;
866 struct kernel_lb_addr tloc;
867
868 retval = -ENOENT;
869 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
870
871 if (IS_ERR_OR_NULL(fi)) {
872 if (fi)
873 retval = PTR_ERR(fi);
874 goto out;
875 }
876
877 retval = -EIO;
878 tloc = lelb_to_cpu(cfi.icb.extLocation);
879 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
880 goto end_unlink;
881
882 if (!inode->i_nlink) {
883 udf_debug("Deleting nonexistent file (%lu), %u\n",
884 inode->i_ino, inode->i_nlink);
885 set_nlink(inode, 1);
886 }
887 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
888 if (retval)
889 goto end_unlink;
890 dir->i_ctime = dir->i_mtime = current_time(dir);
891 mark_inode_dirty(dir);
892 inode_dec_link_count(inode);
893 inode->i_ctime = dir->i_ctime;
894 retval = 0;
895
896 end_unlink:
897 if (fibh.sbh != fibh.ebh)
898 brelse(fibh.ebh);
899 brelse(fibh.sbh);
900
901 out:
902 return retval;
903 }
904
905 static int udf_symlink(struct inode *dir, struct dentry *dentry,
906 const char *symname)
907 {
908 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
909 struct pathComponent *pc;
910 const char *compstart;
911 struct extent_position epos = {};
912 int eoffset, elen = 0;
913 uint8_t *ea;
914 int err;
915 udf_pblk_t block;
916 unsigned char *name = NULL;
917 int namelen;
918 struct udf_inode_info *iinfo;
919 struct super_block *sb = dir->i_sb;
920
921 if (IS_ERR(inode))
922 return PTR_ERR(inode);
923
924 iinfo = UDF_I(inode);
925 down_write(&iinfo->i_data_sem);
926 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
927 if (!name) {
928 err = -ENOMEM;
929 goto out_no_entry;
930 }
931
932 inode->i_data.a_ops = &udf_symlink_aops;
933 inode->i_op = &udf_symlink_inode_operations;
934 inode_nohighmem(inode);
935
936 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
937 struct kernel_lb_addr eloc;
938 uint32_t bsize;
939
940 block = udf_new_block(sb, inode,
941 iinfo->i_location.partitionReferenceNum,
942 iinfo->i_location.logicalBlockNum, &err);
943 if (!block)
944 goto out_no_entry;
945 epos.block = iinfo->i_location;
946 epos.offset = udf_file_entry_alloc_offset(inode);
947 epos.bh = NULL;
948 eloc.logicalBlockNum = block;
949 eloc.partitionReferenceNum =
950 iinfo->i_location.partitionReferenceNum;
951 bsize = sb->s_blocksize;
952 iinfo->i_lenExtents = bsize;
953 udf_add_aext(inode, &epos, &eloc, bsize, 0);
954 brelse(epos.bh);
955
956 block = udf_get_pblock(sb, block,
957 iinfo->i_location.partitionReferenceNum,
958 0);
959 epos.bh = udf_tgetblk(sb, block);
960 lock_buffer(epos.bh);
961 memset(epos.bh->b_data, 0x00, bsize);
962 set_buffer_uptodate(epos.bh);
963 unlock_buffer(epos.bh);
964 mark_buffer_dirty_inode(epos.bh, inode);
965 ea = epos.bh->b_data + udf_ext0_offset(inode);
966 } else
967 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
968
969 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
970 pc = (struct pathComponent *)ea;
971
972 if (*symname == '/') {
973 do {
974 symname++;
975 } while (*symname == '/');
976
977 pc->componentType = 1;
978 pc->lengthComponentIdent = 0;
979 pc->componentFileVersionNum = 0;
980 elen += sizeof(struct pathComponent);
981 }
982
983 err = -ENAMETOOLONG;
984
985 while (*symname) {
986 if (elen + sizeof(struct pathComponent) > eoffset)
987 goto out_no_entry;
988
989 pc = (struct pathComponent *)(ea + elen);
990
991 compstart = symname;
992
993 do {
994 symname++;
995 } while (*symname && *symname != '/');
996
997 pc->componentType = 5;
998 pc->lengthComponentIdent = 0;
999 pc->componentFileVersionNum = 0;
1000 if (compstart[0] == '.') {
1001 if ((symname - compstart) == 1)
1002 pc->componentType = 4;
1003 else if ((symname - compstart) == 2 &&
1004 compstart[1] == '.')
1005 pc->componentType = 3;
1006 }
1007
1008 if (pc->componentType == 5) {
1009 namelen = udf_put_filename(sb, compstart,
1010 symname - compstart,
1011 name, UDF_NAME_LEN_CS0);
1012 if (!namelen)
1013 goto out_no_entry;
1014
1015 if (elen + sizeof(struct pathComponent) + namelen >
1016 eoffset)
1017 goto out_no_entry;
1018 else
1019 pc->lengthComponentIdent = namelen;
1020
1021 memcpy(pc->componentIdent, name, namelen);
1022 }
1023
1024 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1025
1026 if (*symname) {
1027 do {
1028 symname++;
1029 } while (*symname == '/');
1030 }
1031 }
1032
1033 brelse(epos.bh);
1034 inode->i_size = elen;
1035 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1036 iinfo->i_lenAlloc = inode->i_size;
1037 else
1038 udf_truncate_tail_extent(inode);
1039 mark_inode_dirty(inode);
1040 up_write(&iinfo->i_data_sem);
1041
1042 err = udf_add_nondir(dentry, inode);
1043 out:
1044 kfree(name);
1045 return err;
1046
1047 out_no_entry:
1048 up_write(&iinfo->i_data_sem);
1049 inode_dec_link_count(inode);
1050 unlock_new_inode(inode);
1051 iput(inode);
1052 goto out;
1053 }
1054
1055 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1056 struct dentry *dentry)
1057 {
1058 struct inode *inode = d_inode(old_dentry);
1059 struct udf_fileident_bh fibh;
1060 struct fileIdentDesc cfi, *fi;
1061 int err;
1062
1063 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1064 if (!fi) {
1065 return err;
1066 }
1067 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1068 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1069 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1070 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1071 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1072 }
1073 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1074 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1075 mark_inode_dirty(dir);
1076
1077 if (fibh.sbh != fibh.ebh)
1078 brelse(fibh.ebh);
1079 brelse(fibh.sbh);
1080 inc_nlink(inode);
1081 inode->i_ctime = current_time(inode);
1082 mark_inode_dirty(inode);
1083 dir->i_ctime = dir->i_mtime = current_time(dir);
1084 mark_inode_dirty(dir);
1085 ihold(inode);
1086 d_instantiate(dentry, inode);
1087
1088 return 0;
1089 }
1090
1091 /* Anybody can rename anything with this: the permission checks are left to the
1092 * higher-level routines.
1093 */
1094 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1095 struct inode *new_dir, struct dentry *new_dentry,
1096 unsigned int flags)
1097 {
1098 struct inode *old_inode = d_inode(old_dentry);
1099 struct inode *new_inode = d_inode(new_dentry);
1100 struct udf_fileident_bh ofibh, nfibh;
1101 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1102 struct fileIdentDesc ocfi, ncfi;
1103 struct buffer_head *dir_bh = NULL;
1104 int retval = -ENOENT;
1105 struct kernel_lb_addr tloc;
1106 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1107
1108 if (flags & ~RENAME_NOREPLACE)
1109 return -EINVAL;
1110
1111 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1112 if (IS_ERR(ofi)) {
1113 retval = PTR_ERR(ofi);
1114 goto end_rename;
1115 }
1116
1117 if (ofibh.sbh != ofibh.ebh)
1118 brelse(ofibh.ebh);
1119
1120 brelse(ofibh.sbh);
1121 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1122 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1123 != old_inode->i_ino)
1124 goto end_rename;
1125
1126 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1127 if (IS_ERR(nfi)) {
1128 retval = PTR_ERR(nfi);
1129 goto end_rename;
1130 }
1131 if (nfi && !new_inode) {
1132 if (nfibh.sbh != nfibh.ebh)
1133 brelse(nfibh.ebh);
1134 brelse(nfibh.sbh);
1135 nfi = NULL;
1136 }
1137 if (S_ISDIR(old_inode->i_mode)) {
1138 int offset = udf_ext0_offset(old_inode);
1139
1140 if (new_inode) {
1141 retval = -ENOTEMPTY;
1142 if (!empty_dir(new_inode))
1143 goto end_rename;
1144 }
1145 retval = -EIO;
1146 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1147 dir_fi = udf_get_fileident(
1148 old_iinfo->i_ext.i_data -
1149 (old_iinfo->i_efe ?
1150 sizeof(struct extendedFileEntry) :
1151 sizeof(struct fileEntry)),
1152 old_inode->i_sb->s_blocksize, &offset);
1153 } else {
1154 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1155 if (!dir_bh)
1156 goto end_rename;
1157 dir_fi = udf_get_fileident(dir_bh->b_data,
1158 old_inode->i_sb->s_blocksize, &offset);
1159 }
1160 if (!dir_fi)
1161 goto end_rename;
1162 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1163 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1164 old_dir->i_ino)
1165 goto end_rename;
1166 }
1167 if (!nfi) {
1168 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1169 &retval);
1170 if (!nfi)
1171 goto end_rename;
1172 }
1173
1174 /*
1175 * Like most other Unix systems, set the ctime for inodes on a
1176 * rename.
1177 */
1178 old_inode->i_ctime = current_time(old_inode);
1179 mark_inode_dirty(old_inode);
1180
1181 /*
1182 * ok, that's it
1183 */
1184 ncfi.fileVersionNum = ocfi.fileVersionNum;
1185 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1186 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1187 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1188
1189 /* The old fid may have moved - find it again */
1190 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1191 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1192
1193 if (new_inode) {
1194 new_inode->i_ctime = current_time(new_inode);
1195 inode_dec_link_count(new_inode);
1196 }
1197 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1198 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1199 mark_inode_dirty(old_dir);
1200 mark_inode_dirty(new_dir);
1201
1202 if (dir_fi) {
1203 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1204 udf_update_tag((char *)dir_fi,
1205 (sizeof(struct fileIdentDesc) +
1206 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1207 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1208 mark_inode_dirty(old_inode);
1209 else
1210 mark_buffer_dirty_inode(dir_bh, old_inode);
1211
1212 inode_dec_link_count(old_dir);
1213 if (new_inode)
1214 inode_dec_link_count(new_inode);
1215 else {
1216 inc_nlink(new_dir);
1217 mark_inode_dirty(new_dir);
1218 }
1219 }
1220
1221 if (ofi) {
1222 if (ofibh.sbh != ofibh.ebh)
1223 brelse(ofibh.ebh);
1224 brelse(ofibh.sbh);
1225 }
1226
1227 retval = 0;
1228
1229 end_rename:
1230 brelse(dir_bh);
1231 if (nfi) {
1232 if (nfibh.sbh != nfibh.ebh)
1233 brelse(nfibh.ebh);
1234 brelse(nfibh.sbh);
1235 }
1236
1237 return retval;
1238 }
1239
1240 static struct dentry *udf_get_parent(struct dentry *child)
1241 {
1242 struct kernel_lb_addr tloc;
1243 struct inode *inode = NULL;
1244 struct qstr dotdot = QSTR_INIT("..", 2);
1245 struct fileIdentDesc cfi;
1246 struct udf_fileident_bh fibh;
1247
1248 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1249 return ERR_PTR(-EACCES);
1250
1251 if (fibh.sbh != fibh.ebh)
1252 brelse(fibh.ebh);
1253 brelse(fibh.sbh);
1254
1255 tloc = lelb_to_cpu(cfi.icb.extLocation);
1256 inode = udf_iget(child->d_sb, &tloc);
1257 if (IS_ERR(inode))
1258 return ERR_CAST(inode);
1259
1260 return d_obtain_alias(inode);
1261 }
1262
1263
1264 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1265 u16 partref, __u32 generation)
1266 {
1267 struct inode *inode;
1268 struct kernel_lb_addr loc;
1269
1270 if (block == 0)
1271 return ERR_PTR(-ESTALE);
1272
1273 loc.logicalBlockNum = block;
1274 loc.partitionReferenceNum = partref;
1275 inode = udf_iget(sb, &loc);
1276
1277 if (IS_ERR(inode))
1278 return ERR_CAST(inode);
1279
1280 if (generation && inode->i_generation != generation) {
1281 iput(inode);
1282 return ERR_PTR(-ESTALE);
1283 }
1284 return d_obtain_alias(inode);
1285 }
1286
1287 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1288 struct fid *fid, int fh_len, int fh_type)
1289 {
1290 if (fh_len < 3 ||
1291 (fh_type != FILEID_UDF_WITH_PARENT &&
1292 fh_type != FILEID_UDF_WITHOUT_PARENT))
1293 return NULL;
1294
1295 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1296 fid->udf.generation);
1297 }
1298
1299 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1300 struct fid *fid, int fh_len, int fh_type)
1301 {
1302 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1303 return NULL;
1304
1305 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1306 fid->udf.parent_partref,
1307 fid->udf.parent_generation);
1308 }
1309 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1310 struct inode *parent)
1311 {
1312 int len = *lenp;
1313 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1314 struct fid *fid = (struct fid *)fh;
1315 int type = FILEID_UDF_WITHOUT_PARENT;
1316
1317 if (parent && (len < 5)) {
1318 *lenp = 5;
1319 return FILEID_INVALID;
1320 } else if (len < 3) {
1321 *lenp = 3;
1322 return FILEID_INVALID;
1323 }
1324
1325 *lenp = 3;
1326 fid->udf.block = location.logicalBlockNum;
1327 fid->udf.partref = location.partitionReferenceNum;
1328 fid->udf.parent_partref = 0;
1329 fid->udf.generation = inode->i_generation;
1330
1331 if (parent) {
1332 location = UDF_I(parent)->i_location;
1333 fid->udf.parent_block = location.logicalBlockNum;
1334 fid->udf.parent_partref = location.partitionReferenceNum;
1335 fid->udf.parent_generation = inode->i_generation;
1336 *lenp = 5;
1337 type = FILEID_UDF_WITH_PARENT;
1338 }
1339
1340 return type;
1341 }
1342
1343 const struct export_operations udf_export_ops = {
1344 .encode_fh = udf_encode_fh,
1345 .fh_to_dentry = udf_fh_to_dentry,
1346 .fh_to_parent = udf_fh_to_parent,
1347 .get_parent = udf_get_parent,
1348 };
1349
1350 const struct inode_operations udf_dir_inode_operations = {
1351 .lookup = udf_lookup,
1352 .create = udf_create,
1353 .link = udf_link,
1354 .unlink = udf_unlink,
1355 .symlink = udf_symlink,
1356 .mkdir = udf_mkdir,
1357 .rmdir = udf_rmdir,
1358 .mknod = udf_mknod,
1359 .rename = udf_rename,
1360 .tmpfile = udf_tmpfile,
1361 };
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