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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / fs / udf / namei.c
blob0458dd47e105b0c2724064bd816fd4f7ef24e28a
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 unlock_new_inode(inode);
626 d_instantiate(dentry, inode);
627
628 return 0;
629 }
630
631 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
632 bool excl)
633 {
634 struct inode *inode = udf_new_inode(dir, mode);
635
636 if (IS_ERR(inode))
637 return PTR_ERR(inode);
638
639 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
640 inode->i_data.a_ops = &udf_adinicb_aops;
641 else
642 inode->i_data.a_ops = &udf_aops;
643 inode->i_op = &udf_file_inode_operations;
644 inode->i_fop = &udf_file_operations;
645 mark_inode_dirty(inode);
646
647 return udf_add_nondir(dentry, inode);
648 }
649
650 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
651 {
652 struct inode *inode = udf_new_inode(dir, mode);
653
654 if (IS_ERR(inode))
655 return PTR_ERR(inode);
656
657 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
658 inode->i_data.a_ops = &udf_adinicb_aops;
659 else
660 inode->i_data.a_ops = &udf_aops;
661 inode->i_op = &udf_file_inode_operations;
662 inode->i_fop = &udf_file_operations;
663 mark_inode_dirty(inode);
664 d_tmpfile(dentry, inode);
665 unlock_new_inode(inode);
666 return 0;
667 }
668
669 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
670 dev_t rdev)
671 {
672 struct inode *inode;
673
674 if (!old_valid_dev(rdev))
675 return -EINVAL;
676
677 inode = udf_new_inode(dir, mode);
678 if (IS_ERR(inode))
679 return PTR_ERR(inode);
680
681 init_special_inode(inode, mode, rdev);
682 return udf_add_nondir(dentry, inode);
683 }
684
685 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
686 {
687 struct inode *inode;
688 struct udf_fileident_bh fibh;
689 struct fileIdentDesc cfi, *fi;
690 int err;
691 struct udf_inode_info *dinfo = UDF_I(dir);
692 struct udf_inode_info *iinfo;
693
694 inode = udf_new_inode(dir, S_IFDIR | mode);
695 if (IS_ERR(inode))
696 return PTR_ERR(inode);
697
698 iinfo = UDF_I(inode);
699 inode->i_op = &udf_dir_inode_operations;
700 inode->i_fop = &udf_dir_operations;
701 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
702 if (!fi) {
703 inode_dec_link_count(inode);
704 unlock_new_inode(inode);
705 iput(inode);
706 goto out;
707 }
708 set_nlink(inode, 2);
709 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
710 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
711 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
712 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
713 cfi.fileCharacteristics =
714 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
715 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
716 brelse(fibh.sbh);
717 mark_inode_dirty(inode);
718
719 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
720 if (!fi) {
721 clear_nlink(inode);
722 mark_inode_dirty(inode);
723 unlock_new_inode(inode);
724 iput(inode);
725 goto out;
726 }
727 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
728 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
729 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
730 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
731 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
732 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
733 inc_nlink(dir);
734 dir->i_ctime = dir->i_mtime = current_time(dir);
735 mark_inode_dirty(dir);
736 unlock_new_inode(inode);
737 d_instantiate(dentry, inode);
738 if (fibh.sbh != fibh.ebh)
739 brelse(fibh.ebh);
740 brelse(fibh.sbh);
741 err = 0;
742
743 out:
744 return err;
745 }
746
747 static int empty_dir(struct inode *dir)
748 {
749 struct fileIdentDesc *fi, cfi;
750 struct udf_fileident_bh fibh;
751 loff_t f_pos;
752 loff_t size = udf_ext0_offset(dir) + dir->i_size;
753 udf_pblk_t block;
754 struct kernel_lb_addr eloc;
755 uint32_t elen;
756 sector_t offset;
757 struct extent_position epos = {};
758 struct udf_inode_info *dinfo = UDF_I(dir);
759
760 f_pos = udf_ext0_offset(dir);
761 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
762
763 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
764 fibh.sbh = fibh.ebh = NULL;
765 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
766 &epos, &eloc, &elen, &offset) ==
767 (EXT_RECORDED_ALLOCATED >> 30)) {
768 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
769 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
770 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
771 epos.offset -= sizeof(struct short_ad);
772 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
773 epos.offset -= sizeof(struct long_ad);
774 } else
775 offset = 0;
776
777 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
778 if (!fibh.sbh) {
779 brelse(epos.bh);
780 return 0;
781 }
782 } else {
783 brelse(epos.bh);
784 return 0;
785 }
786
787 while (f_pos < size) {
788 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
789 &elen, &offset);
790 if (!fi) {
791 if (fibh.sbh != fibh.ebh)
792 brelse(fibh.ebh);
793 brelse(fibh.sbh);
794 brelse(epos.bh);
795 return 0;
796 }
797
798 if (cfi.lengthFileIdent &&
799 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
800 if (fibh.sbh != fibh.ebh)
801 brelse(fibh.ebh);
802 brelse(fibh.sbh);
803 brelse(epos.bh);
804 return 0;
805 }
806 }
807
808 if (fibh.sbh != fibh.ebh)
809 brelse(fibh.ebh);
810 brelse(fibh.sbh);
811 brelse(epos.bh);
812
813 return 1;
814 }
815
816 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
817 {
818 int retval;
819 struct inode *inode = d_inode(dentry);
820 struct udf_fileident_bh fibh;
821 struct fileIdentDesc *fi, cfi;
822 struct kernel_lb_addr tloc;
823
824 retval = -ENOENT;
825 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
826 if (IS_ERR_OR_NULL(fi)) {
827 if (fi)
828 retval = PTR_ERR(fi);
829 goto out;
830 }
831
832 retval = -EIO;
833 tloc = lelb_to_cpu(cfi.icb.extLocation);
834 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
835 goto end_rmdir;
836 retval = -ENOTEMPTY;
837 if (!empty_dir(inode))
838 goto end_rmdir;
839 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
840 if (retval)
841 goto end_rmdir;
842 if (inode->i_nlink != 2)
843 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
844 inode->i_nlink);
845 clear_nlink(inode);
846 inode->i_size = 0;
847 inode_dec_link_count(dir);
848 inode->i_ctime = dir->i_ctime = dir->i_mtime =
849 current_time(inode);
850 mark_inode_dirty(dir);
851
852 end_rmdir:
853 if (fibh.sbh != fibh.ebh)
854 brelse(fibh.ebh);
855 brelse(fibh.sbh);
856
857 out:
858 return retval;
859 }
860
861 static int udf_unlink(struct inode *dir, struct dentry *dentry)
862 {
863 int retval;
864 struct inode *inode = d_inode(dentry);
865 struct udf_fileident_bh fibh;
866 struct fileIdentDesc *fi;
867 struct fileIdentDesc cfi;
868 struct kernel_lb_addr tloc;
869
870 retval = -ENOENT;
871 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
872
873 if (IS_ERR_OR_NULL(fi)) {
874 if (fi)
875 retval = PTR_ERR(fi);
876 goto out;
877 }
878
879 retval = -EIO;
880 tloc = lelb_to_cpu(cfi.icb.extLocation);
881 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
882 goto end_unlink;
883
884 if (!inode->i_nlink) {
885 udf_debug("Deleting nonexistent file (%lu), %u\n",
886 inode->i_ino, inode->i_nlink);
887 set_nlink(inode, 1);
888 }
889 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
890 if (retval)
891 goto end_unlink;
892 dir->i_ctime = dir->i_mtime = current_time(dir);
893 mark_inode_dirty(dir);
894 inode_dec_link_count(inode);
895 inode->i_ctime = dir->i_ctime;
896 retval = 0;
897
898 end_unlink:
899 if (fibh.sbh != fibh.ebh)
900 brelse(fibh.ebh);
901 brelse(fibh.sbh);
902
903 out:
904 return retval;
905 }
906
907 static int udf_symlink(struct inode *dir, struct dentry *dentry,
908 const char *symname)
909 {
910 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
911 struct pathComponent *pc;
912 const char *compstart;
913 struct extent_position epos = {};
914 int eoffset, elen = 0;
915 uint8_t *ea;
916 int err;
917 udf_pblk_t block;
918 unsigned char *name = NULL;
919 int namelen;
920 struct udf_inode_info *iinfo;
921 struct super_block *sb = dir->i_sb;
922
923 if (IS_ERR(inode))
924 return PTR_ERR(inode);
925
926 iinfo = UDF_I(inode);
927 down_write(&iinfo->i_data_sem);
928 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
929 if (!name) {
930 err = -ENOMEM;
931 goto out_no_entry;
932 }
933
934 inode->i_data.a_ops = &udf_symlink_aops;
935 inode->i_op = &udf_symlink_inode_operations;
936 inode_nohighmem(inode);
937
938 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
939 struct kernel_lb_addr eloc;
940 uint32_t bsize;
941
942 block = udf_new_block(sb, inode,
943 iinfo->i_location.partitionReferenceNum,
944 iinfo->i_location.logicalBlockNum, &err);
945 if (!block)
946 goto out_no_entry;
947 epos.block = iinfo->i_location;
948 epos.offset = udf_file_entry_alloc_offset(inode);
949 epos.bh = NULL;
950 eloc.logicalBlockNum = block;
951 eloc.partitionReferenceNum =
952 iinfo->i_location.partitionReferenceNum;
953 bsize = sb->s_blocksize;
954 iinfo->i_lenExtents = bsize;
955 udf_add_aext(inode, &epos, &eloc, bsize, 0);
956 brelse(epos.bh);
957
958 block = udf_get_pblock(sb, block,
959 iinfo->i_location.partitionReferenceNum,
960 0);
961 epos.bh = udf_tgetblk(sb, block);
962 lock_buffer(epos.bh);
963 memset(epos.bh->b_data, 0x00, bsize);
964 set_buffer_uptodate(epos.bh);
965 unlock_buffer(epos.bh);
966 mark_buffer_dirty_inode(epos.bh, inode);
967 ea = epos.bh->b_data + udf_ext0_offset(inode);
968 } else
969 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
970
971 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
972 pc = (struct pathComponent *)ea;
973
974 if (*symname == '/') {
975 do {
976 symname++;
977 } while (*symname == '/');
978
979 pc->componentType = 1;
980 pc->lengthComponentIdent = 0;
981 pc->componentFileVersionNum = 0;
982 elen += sizeof(struct pathComponent);
983 }
984
985 err = -ENAMETOOLONG;
986
987 while (*symname) {
988 if (elen + sizeof(struct pathComponent) > eoffset)
989 goto out_no_entry;
990
991 pc = (struct pathComponent *)(ea + elen);
992
993 compstart = symname;
994
995 do {
996 symname++;
997 } while (*symname && *symname != '/');
998
999 pc->componentType = 5;
1000 pc->lengthComponentIdent = 0;
1001 pc->componentFileVersionNum = 0;
1002 if (compstart[0] == '.') {
1003 if ((symname - compstart) == 1)
1004 pc->componentType = 4;
1005 else if ((symname - compstart) == 2 &&
1006 compstart[1] == '.')
1007 pc->componentType = 3;
1008 }
1009
1010 if (pc->componentType == 5) {
1011 namelen = udf_put_filename(sb, compstart,
1012 symname - compstart,
1013 name, UDF_NAME_LEN_CS0);
1014 if (!namelen)
1015 goto out_no_entry;
1016
1017 if (elen + sizeof(struct pathComponent) + namelen >
1018 eoffset)
1019 goto out_no_entry;
1020 else
1021 pc->lengthComponentIdent = namelen;
1022
1023 memcpy(pc->componentIdent, name, namelen);
1024 }
1025
1026 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1027
1028 if (*symname) {
1029 do {
1030 symname++;
1031 } while (*symname == '/');
1032 }
1033 }
1034
1035 brelse(epos.bh);
1036 inode->i_size = elen;
1037 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1038 iinfo->i_lenAlloc = inode->i_size;
1039 else
1040 udf_truncate_tail_extent(inode);
1041 mark_inode_dirty(inode);
1042 up_write(&iinfo->i_data_sem);
1043
1044 err = udf_add_nondir(dentry, inode);
1045 out:
1046 kfree(name);
1047 return err;
1048
1049 out_no_entry:
1050 up_write(&iinfo->i_data_sem);
1051 inode_dec_link_count(inode);
1052 unlock_new_inode(inode);
1053 iput(inode);
1054 goto out;
1055 }
1056
1057 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1058 struct dentry *dentry)
1059 {
1060 struct inode *inode = d_inode(old_dentry);
1061 struct udf_fileident_bh fibh;
1062 struct fileIdentDesc cfi, *fi;
1063 int err;
1064
1065 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1066 if (!fi) {
1067 return err;
1068 }
1069 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1070 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1071 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1072 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1073 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1074 }
1075 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1076 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1077 mark_inode_dirty(dir);
1078
1079 if (fibh.sbh != fibh.ebh)
1080 brelse(fibh.ebh);
1081 brelse(fibh.sbh);
1082 inc_nlink(inode);
1083 inode->i_ctime = current_time(inode);
1084 mark_inode_dirty(inode);
1085 dir->i_ctime = dir->i_mtime = current_time(dir);
1086 mark_inode_dirty(dir);
1087 ihold(inode);
1088 d_instantiate(dentry, inode);
1089
1090 return 0;
1091 }
1092
1093 /* Anybody can rename anything with this: the permission checks are left to the
1094 * higher-level routines.
1095 */
1096 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1097 struct inode *new_dir, struct dentry *new_dentry,
1098 unsigned int flags)
1099 {
1100 struct inode *old_inode = d_inode(old_dentry);
1101 struct inode *new_inode = d_inode(new_dentry);
1102 struct udf_fileident_bh ofibh, nfibh;
1103 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1104 struct fileIdentDesc ocfi, ncfi;
1105 struct buffer_head *dir_bh = NULL;
1106 int retval = -ENOENT;
1107 struct kernel_lb_addr tloc;
1108 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1109
1110 if (flags & ~RENAME_NOREPLACE)
1111 return -EINVAL;
1112
1113 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1114 if (IS_ERR(ofi)) {
1115 retval = PTR_ERR(ofi);
1116 goto end_rename;
1117 }
1118
1119 if (ofibh.sbh != ofibh.ebh)
1120 brelse(ofibh.ebh);
1121
1122 brelse(ofibh.sbh);
1123 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1124 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1125 != old_inode->i_ino)
1126 goto end_rename;
1127
1128 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1129 if (IS_ERR(nfi)) {
1130 retval = PTR_ERR(nfi);
1131 goto end_rename;
1132 }
1133 if (nfi && !new_inode) {
1134 if (nfibh.sbh != nfibh.ebh)
1135 brelse(nfibh.ebh);
1136 brelse(nfibh.sbh);
1137 nfi = NULL;
1138 }
1139 if (S_ISDIR(old_inode->i_mode)) {
1140 int offset = udf_ext0_offset(old_inode);
1141
1142 if (new_inode) {
1143 retval = -ENOTEMPTY;
1144 if (!empty_dir(new_inode))
1145 goto end_rename;
1146 }
1147 retval = -EIO;
1148 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1149 dir_fi = udf_get_fileident(
1150 old_iinfo->i_ext.i_data -
1151 (old_iinfo->i_efe ?
1152 sizeof(struct extendedFileEntry) :
1153 sizeof(struct fileEntry)),
1154 old_inode->i_sb->s_blocksize, &offset);
1155 } else {
1156 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1157 if (!dir_bh)
1158 goto end_rename;
1159 dir_fi = udf_get_fileident(dir_bh->b_data,
1160 old_inode->i_sb->s_blocksize, &offset);
1161 }
1162 if (!dir_fi)
1163 goto end_rename;
1164 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1165 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1166 old_dir->i_ino)
1167 goto end_rename;
1168 }
1169 if (!nfi) {
1170 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1171 &retval);
1172 if (!nfi)
1173 goto end_rename;
1174 }
1175
1176 /*
1177 * Like most other Unix systems, set the ctime for inodes on a
1178 * rename.
1179 */
1180 old_inode->i_ctime = current_time(old_inode);
1181 mark_inode_dirty(old_inode);
1182
1183 /*
1184 * ok, that's it
1185 */
1186 ncfi.fileVersionNum = ocfi.fileVersionNum;
1187 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1188 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1189 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1190
1191 /* The old fid may have moved - find it again */
1192 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1193 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1194
1195 if (new_inode) {
1196 new_inode->i_ctime = current_time(new_inode);
1197 inode_dec_link_count(new_inode);
1198 }
1199 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1200 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1201 mark_inode_dirty(old_dir);
1202 mark_inode_dirty(new_dir);
1203
1204 if (dir_fi) {
1205 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1206 udf_update_tag((char *)dir_fi,
1207 (sizeof(struct fileIdentDesc) +
1208 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1209 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1210 mark_inode_dirty(old_inode);
1211 else
1212 mark_buffer_dirty_inode(dir_bh, old_inode);
1213
1214 inode_dec_link_count(old_dir);
1215 if (new_inode)
1216 inode_dec_link_count(new_inode);
1217 else {
1218 inc_nlink(new_dir);
1219 mark_inode_dirty(new_dir);
1220 }
1221 }
1222
1223 if (ofi) {
1224 if (ofibh.sbh != ofibh.ebh)
1225 brelse(ofibh.ebh);
1226 brelse(ofibh.sbh);
1227 }
1228
1229 retval = 0;
1230
1231 end_rename:
1232 brelse(dir_bh);
1233 if (nfi) {
1234 if (nfibh.sbh != nfibh.ebh)
1235 brelse(nfibh.ebh);
1236 brelse(nfibh.sbh);
1237 }
1238
1239 return retval;
1240 }
1241
1242 static struct dentry *udf_get_parent(struct dentry *child)
1243 {
1244 struct kernel_lb_addr tloc;
1245 struct inode *inode = NULL;
1246 struct qstr dotdot = QSTR_INIT("..", 2);
1247 struct fileIdentDesc cfi;
1248 struct udf_fileident_bh fibh;
1249
1250 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1251 return ERR_PTR(-EACCES);
1252
1253 if (fibh.sbh != fibh.ebh)
1254 brelse(fibh.ebh);
1255 brelse(fibh.sbh);
1256
1257 tloc = lelb_to_cpu(cfi.icb.extLocation);
1258 inode = udf_iget(child->d_sb, &tloc);
1259 if (IS_ERR(inode))
1260 return ERR_CAST(inode);
1261
1262 return d_obtain_alias(inode);
1263 }
1264
1265
1266 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1267 u16 partref, __u32 generation)
1268 {
1269 struct inode *inode;
1270 struct kernel_lb_addr loc;
1271
1272 if (block == 0)
1273 return ERR_PTR(-ESTALE);
1274
1275 loc.logicalBlockNum = block;
1276 loc.partitionReferenceNum = partref;
1277 inode = udf_iget(sb, &loc);
1278
1279 if (IS_ERR(inode))
1280 return ERR_CAST(inode);
1281
1282 if (generation && inode->i_generation != generation) {
1283 iput(inode);
1284 return ERR_PTR(-ESTALE);
1285 }
1286 return d_obtain_alias(inode);
1287 }
1288
1289 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1290 struct fid *fid, int fh_len, int fh_type)
1291 {
1292 if (fh_len < 3 ||
1293 (fh_type != FILEID_UDF_WITH_PARENT &&
1294 fh_type != FILEID_UDF_WITHOUT_PARENT))
1295 return NULL;
1296
1297 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1298 fid->udf.generation);
1299 }
1300
1301 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1302 struct fid *fid, int fh_len, int fh_type)
1303 {
1304 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1305 return NULL;
1306
1307 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1308 fid->udf.parent_partref,
1309 fid->udf.parent_generation);
1310 }
1311 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1312 struct inode *parent)
1313 {
1314 int len = *lenp;
1315 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1316 struct fid *fid = (struct fid *)fh;
1317 int type = FILEID_UDF_WITHOUT_PARENT;
1318
1319 if (parent && (len < 5)) {
1320 *lenp = 5;
1321 return FILEID_INVALID;
1322 } else if (len < 3) {
1323 *lenp = 3;
1324 return FILEID_INVALID;
1325 }
1326
1327 *lenp = 3;
1328 fid->udf.block = location.logicalBlockNum;
1329 fid->udf.partref = location.partitionReferenceNum;
1330 fid->udf.parent_partref = 0;
1331 fid->udf.generation = inode->i_generation;
1332
1333 if (parent) {
1334 location = UDF_I(parent)->i_location;
1335 fid->udf.parent_block = location.logicalBlockNum;
1336 fid->udf.parent_partref = location.partitionReferenceNum;
1337 fid->udf.parent_generation = inode->i_generation;
1338 *lenp = 5;
1339 type = FILEID_UDF_WITH_PARENT;
1340 }
1341
1342 return type;
1343 }
1344
1345 const struct export_operations udf_export_ops = {
1346 .encode_fh = udf_encode_fh,
1347 .fh_to_dentry = udf_fh_to_dentry,
1348 .fh_to_parent = udf_fh_to_parent,
1349 .get_parent = udf_get_parent,
1350 };
1351
1352 const struct inode_operations udf_dir_inode_operations = {
1353 .lookup = udf_lookup,
1354 .create = udf_create,
1355 .link = udf_link,
1356 .unlink = udf_unlink,
1357 .symlink = udf_symlink,
1358 .mkdir = udf_mkdir,
1359 .rmdir = udf_rmdir,
1360 .mknod = udf_mknod,
1361 .rename = udf_rename,
1362 .tmpfile = udf_tmpfile,
1363 };
CRIS linux kernel tree