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