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jme: Fix device PM wakeup API usage
[linux/fpc-iii.git] / fs / udf / namei.c
blobfd6bfa153f491d830e8ff6ca8b08eaae118b4286
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/buffer_head.h>
31 #include <linux/sched.h>
32 #include <linux/crc-itu-t.h>
33 #include <linux/exportfs.h>
34
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
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 return 0;
140 }
141
142 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
143 const struct qstr *child,
144 struct udf_fileident_bh *fibh,
145 struct fileIdentDesc *cfi)
146 {
147 struct fileIdentDesc *fi = NULL;
148 loff_t f_pos;
149 int block, flen;
150 unsigned char *fname = NULL;
151 unsigned char *nameptr;
152 uint8_t lfi;
153 uint16_t liu;
154 loff_t size;
155 struct kernel_lb_addr eloc;
156 uint32_t elen;
157 sector_t offset;
158 struct extent_position epos = {};
159 struct udf_inode_info *dinfo = UDF_I(dir);
160 int isdotdot = child->len == 2 &&
161 child->name[0] == '.' && child->name[1] == '.';
162
163 size = udf_ext0_offset(dir) + dir->i_size;
164 f_pos = udf_ext0_offset(dir);
165
166 fibh->sbh = fibh->ebh = NULL;
167 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
168 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
169 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
170 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
171 goto out_err;
172 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
173 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
174 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
175 epos.offset -= sizeof(struct short_ad);
176 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
177 epos.offset -= sizeof(struct long_ad);
178 } else
179 offset = 0;
180
181 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
182 if (!fibh->sbh)
183 goto out_err;
184 }
185
186 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
187 if (!fname)
188 goto out_err;
189
190 while (f_pos < size) {
191 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
192 &elen, &offset);
193 if (!fi)
194 goto out_err;
195
196 liu = le16_to_cpu(cfi->lengthOfImpUse);
197 lfi = cfi->lengthFileIdent;
198
199 if (fibh->sbh == fibh->ebh) {
200 nameptr = fi->fileIdent + liu;
201 } else {
202 int poffset; /* Unpaded ending offset */
203
204 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
205 liu + lfi;
206
207 if (poffset >= lfi)
208 nameptr = (uint8_t *)(fibh->ebh->b_data +
209 poffset - lfi);
210 else {
211 nameptr = fname;
212 memcpy(nameptr, fi->fileIdent + liu,
213 lfi - poffset);
214 memcpy(nameptr + lfi - poffset,
215 fibh->ebh->b_data, poffset);
216 }
217 }
218
219 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
220 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
221 continue;
222 }
223
224 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
225 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
226 continue;
227 }
228
229 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
230 isdotdot)
231 goto out_ok;
232
233 if (!lfi)
234 continue;
235
236 flen = udf_get_filename(dir->i_sb, nameptr, lfi, fname,
237 UDF_NAME_LEN);
238 if (flen && udf_match(flen, fname, child->len, child->name))
239 goto out_ok;
240 }
241
242 out_err:
243 fi = NULL;
244 if (fibh->sbh != fibh->ebh)
245 brelse(fibh->ebh);
246 brelse(fibh->sbh);
247 out_ok:
248 brelse(epos.bh);
249 kfree(fname);
250
251 return fi;
252 }
253
254 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
255 unsigned int flags)
256 {
257 struct inode *inode = NULL;
258 struct fileIdentDesc cfi;
259 struct udf_fileident_bh fibh;
260
261 if (dentry->d_name.len > UDF_NAME_LEN - 2)
262 return ERR_PTR(-ENAMETOOLONG);
263
264 #ifdef UDF_RECOVERY
265 /* temporary shorthand for specifying files by inode number */
266 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
267 struct kernel_lb_addr lb = {
268 .logicalBlockNum = 0,
269 .partitionReferenceNum =
270 simple_strtoul(dentry->d_name.name + 3,
271 NULL, 0),
272 };
273 inode = udf_iget(dir->i_sb, lb);
274 if (!inode) {
275 return ERR_PTR(-EACCES);
276 }
277 } else
278 #endif /* UDF_RECOVERY */
279
280 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
281 struct kernel_lb_addr loc;
282
283 if (fibh.sbh != fibh.ebh)
284 brelse(fibh.ebh);
285 brelse(fibh.sbh);
286
287 loc = lelb_to_cpu(cfi.icb.extLocation);
288 inode = udf_iget(dir->i_sb, &loc);
289 if (!inode) {
290 return ERR_PTR(-EACCES);
291 }
292 }
293
294 return d_splice_alias(inode, dentry);
295 }
296
297 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
298 struct dentry *dentry,
299 struct udf_fileident_bh *fibh,
300 struct fileIdentDesc *cfi, int *err)
301 {
302 struct super_block *sb = dir->i_sb;
303 struct fileIdentDesc *fi = NULL;
304 unsigned char *name = NULL;
305 int namelen;
306 loff_t f_pos;
307 loff_t size = udf_ext0_offset(dir) + dir->i_size;
308 int nfidlen;
309 uint8_t lfi;
310 uint16_t liu;
311 int block;
312 struct kernel_lb_addr eloc;
313 uint32_t elen = 0;
314 sector_t offset;
315 struct extent_position epos = {};
316 struct udf_inode_info *dinfo;
317
318 fibh->sbh = fibh->ebh = NULL;
319 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
320 if (!name) {
321 *err = -ENOMEM;
322 goto out_err;
323 }
324
325 if (dentry) {
326 if (!dentry->d_name.len) {
327 *err = -EINVAL;
328 goto out_err;
329 }
330 namelen = udf_put_filename(sb, dentry->d_name.name, name,
331 dentry->d_name.len);
332 if (!namelen) {
333 *err = -ENAMETOOLONG;
334 goto out_err;
335 }
336 } else {
337 namelen = 0;
338 }
339
340 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
341
342 f_pos = udf_ext0_offset(dir);
343
344 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
345 dinfo = UDF_I(dir);
346 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
347 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
348 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
349 block = udf_get_lb_pblock(dir->i_sb,
350 &dinfo->i_location, 0);
351 fibh->soffset = fibh->eoffset = sb->s_blocksize;
352 goto add;
353 }
354 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
355 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
356 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
357 epos.offset -= sizeof(struct short_ad);
358 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
359 epos.offset -= sizeof(struct long_ad);
360 } else
361 offset = 0;
362
363 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
364 if (!fibh->sbh) {
365 *err = -EIO;
366 goto out_err;
367 }
368
369 block = dinfo->i_location.logicalBlockNum;
370 }
371
372 while (f_pos < size) {
373 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
374 &elen, &offset);
375
376 if (!fi) {
377 *err = -EIO;
378 goto out_err;
379 }
380
381 liu = le16_to_cpu(cfi->lengthOfImpUse);
382 lfi = cfi->lengthFileIdent;
383
384 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
385 if (((sizeof(struct fileIdentDesc) +
386 liu + lfi + 3) & ~3) == nfidlen) {
387 cfi->descTag.tagSerialNum = cpu_to_le16(1);
388 cfi->fileVersionNum = cpu_to_le16(1);
389 cfi->fileCharacteristics = 0;
390 cfi->lengthFileIdent = namelen;
391 cfi->lengthOfImpUse = cpu_to_le16(0);
392 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
393 name))
394 goto out_ok;
395 else {
396 *err = -EIO;
397 goto out_err;
398 }
399 }
400 }
401 }
402
403 add:
404 f_pos += nfidlen;
405
406 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
407 sb->s_blocksize - fibh->eoffset < nfidlen) {
408 brelse(epos.bh);
409 epos.bh = NULL;
410 fibh->soffset -= udf_ext0_offset(dir);
411 fibh->eoffset -= udf_ext0_offset(dir);
412 f_pos -= udf_ext0_offset(dir);
413 if (fibh->sbh != fibh->ebh)
414 brelse(fibh->ebh);
415 brelse(fibh->sbh);
416 fibh->sbh = fibh->ebh =
417 udf_expand_dir_adinicb(dir, &block, err);
418 if (!fibh->sbh)
419 goto out_err;
420 epos.block = dinfo->i_location;
421 epos.offset = udf_file_entry_alloc_offset(dir);
422 /* Load extent udf_expand_dir_adinicb() has created */
423 udf_current_aext(dir, &epos, &eloc, &elen, 1);
424 }
425
426 /* Entry fits into current block? */
427 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
428 fibh->soffset = fibh->eoffset;
429 fibh->eoffset += nfidlen;
430 if (fibh->sbh != fibh->ebh) {
431 brelse(fibh->sbh);
432 fibh->sbh = fibh->ebh;
433 }
434
435 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
436 block = dinfo->i_location.logicalBlockNum;
437 fi = (struct fileIdentDesc *)
438 (dinfo->i_ext.i_data +
439 fibh->soffset -
440 udf_ext0_offset(dir) +
441 dinfo->i_lenEAttr);
442 } else {
443 block = eloc.logicalBlockNum +
444 ((elen - 1) >>
445 dir->i_sb->s_blocksize_bits);
446 fi = (struct fileIdentDesc *)
447 (fibh->sbh->b_data + fibh->soffset);
448 }
449 } else {
450 /* Round up last extent in the file */
451 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
452 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
453 epos.offset -= sizeof(struct short_ad);
454 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
455 epos.offset -= sizeof(struct long_ad);
456 udf_write_aext(dir, &epos, &eloc, elen, 1);
457 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
458 - 1) & ~(sb->s_blocksize - 1);
459
460 fibh->soffset = fibh->eoffset - sb->s_blocksize;
461 fibh->eoffset += nfidlen - sb->s_blocksize;
462 if (fibh->sbh != fibh->ebh) {
463 brelse(fibh->sbh);
464 fibh->sbh = fibh->ebh;
465 }
466
467 block = eloc.logicalBlockNum + ((elen - 1) >>
468 dir->i_sb->s_blocksize_bits);
469 fibh->ebh = udf_bread(dir,
470 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
471 if (!fibh->ebh)
472 goto out_err;
473 /* Extents could have been merged, invalidate our position */
474 brelse(epos.bh);
475 epos.bh = NULL;
476 epos.block = dinfo->i_location;
477 epos.offset = udf_file_entry_alloc_offset(dir);
478
479 if (!fibh->soffset) {
480 /* Find the freshly allocated block */
481 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
482 (EXT_RECORDED_ALLOCATED >> 30))
483 ;
484 block = eloc.logicalBlockNum + ((elen - 1) >>
485 dir->i_sb->s_blocksize_bits);
486 brelse(fibh->sbh);
487 fibh->sbh = fibh->ebh;
488 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
489 } else {
490 fi = (struct fileIdentDesc *)
491 (fibh->sbh->b_data + sb->s_blocksize +
492 fibh->soffset);
493 }
494 }
495
496 memset(cfi, 0, sizeof(struct fileIdentDesc));
497 if (UDF_SB(sb)->s_udfrev >= 0x0200)
498 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
499 sizeof(struct tag));
500 else
501 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
502 sizeof(struct tag));
503 cfi->fileVersionNum = cpu_to_le16(1);
504 cfi->lengthFileIdent = namelen;
505 cfi->lengthOfImpUse = cpu_to_le16(0);
506 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
507 dir->i_size += nfidlen;
508 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
509 dinfo->i_lenAlloc += nfidlen;
510 else {
511 /* Find the last extent and truncate it to proper size */
512 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
513 (EXT_RECORDED_ALLOCATED >> 30))
514 ;
515 elen -= dinfo->i_lenExtents - dir->i_size;
516 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
517 epos.offset -= sizeof(struct short_ad);
518 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
519 epos.offset -= sizeof(struct long_ad);
520 udf_write_aext(dir, &epos, &eloc, elen, 1);
521 dinfo->i_lenExtents = dir->i_size;
522 }
523
524 mark_inode_dirty(dir);
525 goto out_ok;
526 } else {
527 *err = -EIO;
528 goto out_err;
529 }
530
531 out_err:
532 fi = NULL;
533 if (fibh->sbh != fibh->ebh)
534 brelse(fibh->ebh);
535 brelse(fibh->sbh);
536 out_ok:
537 brelse(epos.bh);
538 kfree(name);
539 return fi;
540 }
541
542 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
543 struct udf_fileident_bh *fibh,
544 struct fileIdentDesc *cfi)
545 {
546 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
547
548 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
549 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
550
551 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
552 }
553
554 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
555 bool excl)
556 {
557 struct udf_fileident_bh fibh;
558 struct inode *inode;
559 struct fileIdentDesc cfi, *fi;
560 int err;
561 struct udf_inode_info *iinfo;
562
563 inode = udf_new_inode(dir, mode, &err);
564 if (!inode) {
565 return err;
566 }
567
568 iinfo = UDF_I(inode);
569 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
570 inode->i_data.a_ops = &udf_adinicb_aops;
571 else
572 inode->i_data.a_ops = &udf_aops;
573 inode->i_op = &udf_file_inode_operations;
574 inode->i_fop = &udf_file_operations;
575 mark_inode_dirty(inode);
576
577 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
578 if (!fi) {
579 inode_dec_link_count(inode);
580 iput(inode);
581 return err;
582 }
583 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
584 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
585 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
586 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
587 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
588 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
589 mark_inode_dirty(dir);
590 if (fibh.sbh != fibh.ebh)
591 brelse(fibh.ebh);
592 brelse(fibh.sbh);
593 d_instantiate(dentry, inode);
594
595 return 0;
596 }
597
598 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
599 {
600 struct inode *inode;
601 struct udf_inode_info *iinfo;
602 int err;
603
604 inode = udf_new_inode(dir, mode, &err);
605 if (!inode)
606 return err;
607
608 iinfo = UDF_I(inode);
609 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
610 inode->i_data.a_ops = &udf_adinicb_aops;
611 else
612 inode->i_data.a_ops = &udf_aops;
613 inode->i_op = &udf_file_inode_operations;
614 inode->i_fop = &udf_file_operations;
615 mark_inode_dirty(inode);
616
617 d_tmpfile(dentry, inode);
618 return 0;
619 }
620
621 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
622 dev_t rdev)
623 {
624 struct inode *inode;
625 struct udf_fileident_bh fibh;
626 struct fileIdentDesc cfi, *fi;
627 int err;
628 struct udf_inode_info *iinfo;
629
630 if (!old_valid_dev(rdev))
631 return -EINVAL;
632
633 err = -EIO;
634 inode = udf_new_inode(dir, mode, &err);
635 if (!inode)
636 goto out;
637
638 iinfo = UDF_I(inode);
639 init_special_inode(inode, mode, rdev);
640 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
641 if (!fi) {
642 inode_dec_link_count(inode);
643 iput(inode);
644 return err;
645 }
646 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
647 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
648 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
649 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
650 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
651 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
652 mark_inode_dirty(dir);
653 mark_inode_dirty(inode);
654
655 if (fibh.sbh != fibh.ebh)
656 brelse(fibh.ebh);
657 brelse(fibh.sbh);
658 d_instantiate(dentry, inode);
659 err = 0;
660
661 out:
662 return err;
663 }
664
665 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
666 {
667 struct inode *inode;
668 struct udf_fileident_bh fibh;
669 struct fileIdentDesc cfi, *fi;
670 int err;
671 struct udf_inode_info *dinfo = UDF_I(dir);
672 struct udf_inode_info *iinfo;
673
674 err = -EIO;
675 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
676 if (!inode)
677 goto out;
678
679 iinfo = UDF_I(inode);
680 inode->i_op = &udf_dir_inode_operations;
681 inode->i_fop = &udf_dir_operations;
682 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
683 if (!fi) {
684 inode_dec_link_count(inode);
685 iput(inode);
686 goto out;
687 }
688 set_nlink(inode, 2);
689 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
690 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
691 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
692 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
693 cfi.fileCharacteristics =
694 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
695 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
696 brelse(fibh.sbh);
697 mark_inode_dirty(inode);
698
699 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
700 if (!fi) {
701 clear_nlink(inode);
702 mark_inode_dirty(inode);
703 iput(inode);
704 goto out;
705 }
706 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
707 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
708 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
709 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
710 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
711 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
712 inc_nlink(dir);
713 mark_inode_dirty(dir);
714 d_instantiate(dentry, inode);
715 if (fibh.sbh != fibh.ebh)
716 brelse(fibh.ebh);
717 brelse(fibh.sbh);
718 err = 0;
719
720 out:
721 return err;
722 }
723
724 static int empty_dir(struct inode *dir)
725 {
726 struct fileIdentDesc *fi, cfi;
727 struct udf_fileident_bh fibh;
728 loff_t f_pos;
729 loff_t size = udf_ext0_offset(dir) + dir->i_size;
730 int block;
731 struct kernel_lb_addr eloc;
732 uint32_t elen;
733 sector_t offset;
734 struct extent_position epos = {};
735 struct udf_inode_info *dinfo = UDF_I(dir);
736
737 f_pos = udf_ext0_offset(dir);
738 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
739
740 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
741 fibh.sbh = fibh.ebh = NULL;
742 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
743 &epos, &eloc, &elen, &offset) ==
744 (EXT_RECORDED_ALLOCATED >> 30)) {
745 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
746 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
747 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
748 epos.offset -= sizeof(struct short_ad);
749 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
750 epos.offset -= sizeof(struct long_ad);
751 } else
752 offset = 0;
753
754 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
755 if (!fibh.sbh) {
756 brelse(epos.bh);
757 return 0;
758 }
759 } else {
760 brelse(epos.bh);
761 return 0;
762 }
763
764 while (f_pos < size) {
765 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
766 &elen, &offset);
767 if (!fi) {
768 if (fibh.sbh != fibh.ebh)
769 brelse(fibh.ebh);
770 brelse(fibh.sbh);
771 brelse(epos.bh);
772 return 0;
773 }
774
775 if (cfi.lengthFileIdent &&
776 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
777 if (fibh.sbh != fibh.ebh)
778 brelse(fibh.ebh);
779 brelse(fibh.sbh);
780 brelse(epos.bh);
781 return 0;
782 }
783 }
784
785 if (fibh.sbh != fibh.ebh)
786 brelse(fibh.ebh);
787 brelse(fibh.sbh);
788 brelse(epos.bh);
789
790 return 1;
791 }
792
793 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
794 {
795 int retval;
796 struct inode *inode = dentry->d_inode;
797 struct udf_fileident_bh fibh;
798 struct fileIdentDesc *fi, cfi;
799 struct kernel_lb_addr tloc;
800
801 retval = -ENOENT;
802 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
803 if (!fi)
804 goto out;
805
806 retval = -EIO;
807 tloc = lelb_to_cpu(cfi.icb.extLocation);
808 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
809 goto end_rmdir;
810 retval = -ENOTEMPTY;
811 if (!empty_dir(inode))
812 goto end_rmdir;
813 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
814 if (retval)
815 goto end_rmdir;
816 if (inode->i_nlink != 2)
817 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
818 inode->i_nlink);
819 clear_nlink(inode);
820 inode->i_size = 0;
821 inode_dec_link_count(dir);
822 inode->i_ctime = dir->i_ctime = dir->i_mtime =
823 current_fs_time(dir->i_sb);
824 mark_inode_dirty(dir);
825
826 end_rmdir:
827 if (fibh.sbh != fibh.ebh)
828 brelse(fibh.ebh);
829 brelse(fibh.sbh);
830
831 out:
832 return retval;
833 }
834
835 static int udf_unlink(struct inode *dir, struct dentry *dentry)
836 {
837 int retval;
838 struct inode *inode = dentry->d_inode;
839 struct udf_fileident_bh fibh;
840 struct fileIdentDesc *fi;
841 struct fileIdentDesc cfi;
842 struct kernel_lb_addr tloc;
843
844 retval = -ENOENT;
845 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
846 if (!fi)
847 goto out;
848
849 retval = -EIO;
850 tloc = lelb_to_cpu(cfi.icb.extLocation);
851 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
852 goto end_unlink;
853
854 if (!inode->i_nlink) {
855 udf_debug("Deleting nonexistent file (%lu), %d\n",
856 inode->i_ino, inode->i_nlink);
857 set_nlink(inode, 1);
858 }
859 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
860 if (retval)
861 goto end_unlink;
862 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
863 mark_inode_dirty(dir);
864 inode_dec_link_count(inode);
865 inode->i_ctime = dir->i_ctime;
866 retval = 0;
867
868 end_unlink:
869 if (fibh.sbh != fibh.ebh)
870 brelse(fibh.ebh);
871 brelse(fibh.sbh);
872
873 out:
874 return retval;
875 }
876
877 static int udf_symlink(struct inode *dir, struct dentry *dentry,
878 const char *symname)
879 {
880 struct inode *inode;
881 struct pathComponent *pc;
882 const char *compstart;
883 struct udf_fileident_bh fibh;
884 struct extent_position epos = {};
885 int eoffset, elen = 0;
886 struct fileIdentDesc *fi;
887 struct fileIdentDesc cfi;
888 uint8_t *ea;
889 int err;
890 int block;
891 unsigned char *name = NULL;
892 int namelen;
893 struct udf_inode_info *iinfo;
894 struct super_block *sb = dir->i_sb;
895
896 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
897 if (!inode)
898 goto out;
899
900 iinfo = UDF_I(inode);
901 down_write(&iinfo->i_data_sem);
902 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
903 if (!name) {
904 err = -ENOMEM;
905 goto out_no_entry;
906 }
907
908 inode->i_data.a_ops = &udf_symlink_aops;
909 inode->i_op = &udf_symlink_inode_operations;
910
911 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
912 struct kernel_lb_addr eloc;
913 uint32_t bsize;
914
915 block = udf_new_block(sb, inode,
916 iinfo->i_location.partitionReferenceNum,
917 iinfo->i_location.logicalBlockNum, &err);
918 if (!block)
919 goto out_no_entry;
920 epos.block = iinfo->i_location;
921 epos.offset = udf_file_entry_alloc_offset(inode);
922 epos.bh = NULL;
923 eloc.logicalBlockNum = block;
924 eloc.partitionReferenceNum =
925 iinfo->i_location.partitionReferenceNum;
926 bsize = sb->s_blocksize;
927 iinfo->i_lenExtents = bsize;
928 udf_add_aext(inode, &epos, &eloc, bsize, 0);
929 brelse(epos.bh);
930
931 block = udf_get_pblock(sb, block,
932 iinfo->i_location.partitionReferenceNum,
933 0);
934 epos.bh = udf_tgetblk(sb, block);
935 lock_buffer(epos.bh);
936 memset(epos.bh->b_data, 0x00, bsize);
937 set_buffer_uptodate(epos.bh);
938 unlock_buffer(epos.bh);
939 mark_buffer_dirty_inode(epos.bh, inode);
940 ea = epos.bh->b_data + udf_ext0_offset(inode);
941 } else
942 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
943
944 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
945 pc = (struct pathComponent *)ea;
946
947 if (*symname == '/') {
948 do {
949 symname++;
950 } while (*symname == '/');
951
952 pc->componentType = 1;
953 pc->lengthComponentIdent = 0;
954 pc->componentFileVersionNum = 0;
955 elen += sizeof(struct pathComponent);
956 }
957
958 err = -ENAMETOOLONG;
959
960 while (*symname) {
961 if (elen + sizeof(struct pathComponent) > eoffset)
962 goto out_no_entry;
963
964 pc = (struct pathComponent *)(ea + elen);
965
966 compstart = symname;
967
968 do {
969 symname++;
970 } while (*symname && *symname != '/');
971
972 pc->componentType = 5;
973 pc->lengthComponentIdent = 0;
974 pc->componentFileVersionNum = 0;
975 if (compstart[0] == '.') {
976 if ((symname - compstart) == 1)
977 pc->componentType = 4;
978 else if ((symname - compstart) == 2 &&
979 compstart[1] == '.')
980 pc->componentType = 3;
981 }
982
983 if (pc->componentType == 5) {
984 namelen = udf_put_filename(sb, compstart, name,
985 symname - compstart);
986 if (!namelen)
987 goto out_no_entry;
988
989 if (elen + sizeof(struct pathComponent) + namelen >
990 eoffset)
991 goto out_no_entry;
992 else
993 pc->lengthComponentIdent = namelen;
994
995 memcpy(pc->componentIdent, name, namelen);
996 }
997
998 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
999
1000 if (*symname) {
1001 do {
1002 symname++;
1003 } while (*symname == '/');
1004 }
1005 }
1006
1007 brelse(epos.bh);
1008 inode->i_size = elen;
1009 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1010 iinfo->i_lenAlloc = inode->i_size;
1011 else
1012 udf_truncate_tail_extent(inode);
1013 mark_inode_dirty(inode);
1014 up_write(&iinfo->i_data_sem);
1015
1016 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1017 if (!fi)
1018 goto out_no_entry;
1019 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1020 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1021 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1022 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1023 cpu_to_le32(lvid_get_unique_id(sb));
1024 }
1025 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1026 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1027 mark_inode_dirty(dir);
1028 if (fibh.sbh != fibh.ebh)
1029 brelse(fibh.ebh);
1030 brelse(fibh.sbh);
1031 d_instantiate(dentry, inode);
1032 err = 0;
1033
1034 out:
1035 kfree(name);
1036 return err;
1037
1038 out_no_entry:
1039 up_write(&iinfo->i_data_sem);
1040 inode_dec_link_count(inode);
1041 iput(inode);
1042 goto out;
1043 }
1044
1045 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1046 struct dentry *dentry)
1047 {
1048 struct inode *inode = old_dentry->d_inode;
1049 struct udf_fileident_bh fibh;
1050 struct fileIdentDesc cfi, *fi;
1051 int err;
1052
1053 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1054 if (!fi) {
1055 return err;
1056 }
1057 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1058 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1059 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1060 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1061 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1062 }
1063 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1064 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1065 mark_inode_dirty(dir);
1066
1067 if (fibh.sbh != fibh.ebh)
1068 brelse(fibh.ebh);
1069 brelse(fibh.sbh);
1070 inc_nlink(inode);
1071 inode->i_ctime = current_fs_time(inode->i_sb);
1072 mark_inode_dirty(inode);
1073 ihold(inode);
1074 d_instantiate(dentry, inode);
1075
1076 return 0;
1077 }
1078
1079 /* Anybody can rename anything with this: the permission checks are left to the
1080 * higher-level routines.
1081 */
1082 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1083 struct inode *new_dir, struct dentry *new_dentry)
1084 {
1085 struct inode *old_inode = old_dentry->d_inode;
1086 struct inode *new_inode = new_dentry->d_inode;
1087 struct udf_fileident_bh ofibh, nfibh;
1088 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1089 struct fileIdentDesc ocfi, ncfi;
1090 struct buffer_head *dir_bh = NULL;
1091 int retval = -ENOENT;
1092 struct kernel_lb_addr tloc;
1093 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1094
1095 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1096 if (ofi) {
1097 if (ofibh.sbh != ofibh.ebh)
1098 brelse(ofibh.ebh);
1099 brelse(ofibh.sbh);
1100 }
1101 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1102 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1103 != old_inode->i_ino)
1104 goto end_rename;
1105
1106 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1107 if (nfi) {
1108 if (!new_inode) {
1109 if (nfibh.sbh != nfibh.ebh)
1110 brelse(nfibh.ebh);
1111 brelse(nfibh.sbh);
1112 nfi = NULL;
1113 }
1114 }
1115 if (S_ISDIR(old_inode->i_mode)) {
1116 int offset = udf_ext0_offset(old_inode);
1117
1118 if (new_inode) {
1119 retval = -ENOTEMPTY;
1120 if (!empty_dir(new_inode))
1121 goto end_rename;
1122 }
1123 retval = -EIO;
1124 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1125 dir_fi = udf_get_fileident(
1126 old_iinfo->i_ext.i_data -
1127 (old_iinfo->i_efe ?
1128 sizeof(struct extendedFileEntry) :
1129 sizeof(struct fileEntry)),
1130 old_inode->i_sb->s_blocksize, &offset);
1131 } else {
1132 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1133 if (!dir_bh)
1134 goto end_rename;
1135 dir_fi = udf_get_fileident(dir_bh->b_data,
1136 old_inode->i_sb->s_blocksize, &offset);
1137 }
1138 if (!dir_fi)
1139 goto end_rename;
1140 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1141 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1142 old_dir->i_ino)
1143 goto end_rename;
1144 }
1145 if (!nfi) {
1146 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1147 &retval);
1148 if (!nfi)
1149 goto end_rename;
1150 }
1151
1152 /*
1153 * Like most other Unix systems, set the ctime for inodes on a
1154 * rename.
1155 */
1156 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1157 mark_inode_dirty(old_inode);
1158
1159 /*
1160 * ok, that's it
1161 */
1162 ncfi.fileVersionNum = ocfi.fileVersionNum;
1163 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1164 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1165 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1166
1167 /* The old fid may have moved - find it again */
1168 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1169 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1170
1171 if (new_inode) {
1172 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1173 inode_dec_link_count(new_inode);
1174 }
1175 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1176 mark_inode_dirty(old_dir);
1177
1178 if (dir_fi) {
1179 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1180 udf_update_tag((char *)dir_fi,
1181 (sizeof(struct fileIdentDesc) +
1182 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1183 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1184 mark_inode_dirty(old_inode);
1185 else
1186 mark_buffer_dirty_inode(dir_bh, old_inode);
1187
1188 inode_dec_link_count(old_dir);
1189 if (new_inode)
1190 inode_dec_link_count(new_inode);
1191 else {
1192 inc_nlink(new_dir);
1193 mark_inode_dirty(new_dir);
1194 }
1195 }
1196
1197 if (ofi) {
1198 if (ofibh.sbh != ofibh.ebh)
1199 brelse(ofibh.ebh);
1200 brelse(ofibh.sbh);
1201 }
1202
1203 retval = 0;
1204
1205 end_rename:
1206 brelse(dir_bh);
1207 if (nfi) {
1208 if (nfibh.sbh != nfibh.ebh)
1209 brelse(nfibh.ebh);
1210 brelse(nfibh.sbh);
1211 }
1212
1213 return retval;
1214 }
1215
1216 static struct dentry *udf_get_parent(struct dentry *child)
1217 {
1218 struct kernel_lb_addr tloc;
1219 struct inode *inode = NULL;
1220 struct qstr dotdot = QSTR_INIT("..", 2);
1221 struct fileIdentDesc cfi;
1222 struct udf_fileident_bh fibh;
1223
1224 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1225 goto out_unlock;
1226
1227 if (fibh.sbh != fibh.ebh)
1228 brelse(fibh.ebh);
1229 brelse(fibh.sbh);
1230
1231 tloc = lelb_to_cpu(cfi.icb.extLocation);
1232 inode = udf_iget(child->d_inode->i_sb, &tloc);
1233 if (!inode)
1234 goto out_unlock;
1235
1236 return d_obtain_alias(inode);
1237 out_unlock:
1238 return ERR_PTR(-EACCES);
1239 }
1240
1241
1242 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1243 u16 partref, __u32 generation)
1244 {
1245 struct inode *inode;
1246 struct kernel_lb_addr loc;
1247
1248 if (block == 0)
1249 return ERR_PTR(-ESTALE);
1250
1251 loc.logicalBlockNum = block;
1252 loc.partitionReferenceNum = partref;
1253 inode = udf_iget(sb, &loc);
1254
1255 if (inode == NULL)
1256 return ERR_PTR(-ENOMEM);
1257
1258 if (generation && inode->i_generation != generation) {
1259 iput(inode);
1260 return ERR_PTR(-ESTALE);
1261 }
1262 return d_obtain_alias(inode);
1263 }
1264
1265 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1266 struct fid *fid, int fh_len, int fh_type)
1267 {
1268 if ((fh_len != 3 && fh_len != 5) ||
1269 (fh_type != FILEID_UDF_WITH_PARENT &&
1270 fh_type != FILEID_UDF_WITHOUT_PARENT))
1271 return NULL;
1272
1273 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1274 fid->udf.generation);
1275 }
1276
1277 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1278 struct fid *fid, int fh_len, int fh_type)
1279 {
1280 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1281 return NULL;
1282
1283 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1284 fid->udf.parent_partref,
1285 fid->udf.parent_generation);
1286 }
1287 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1288 struct inode *parent)
1289 {
1290 int len = *lenp;
1291 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1292 struct fid *fid = (struct fid *)fh;
1293 int type = FILEID_UDF_WITHOUT_PARENT;
1294
1295 if (parent && (len < 5)) {
1296 *lenp = 5;
1297 return FILEID_INVALID;
1298 } else if (len < 3) {
1299 *lenp = 3;
1300 return FILEID_INVALID;
1301 }
1302
1303 *lenp = 3;
1304 fid->udf.block = location.logicalBlockNum;
1305 fid->udf.partref = location.partitionReferenceNum;
1306 fid->udf.parent_partref = 0;
1307 fid->udf.generation = inode->i_generation;
1308
1309 if (parent) {
1310 location = UDF_I(parent)->i_location;
1311 fid->udf.parent_block = location.logicalBlockNum;
1312 fid->udf.parent_partref = location.partitionReferenceNum;
1313 fid->udf.parent_generation = inode->i_generation;
1314 *lenp = 5;
1315 type = FILEID_UDF_WITH_PARENT;
1316 }
1317
1318 return type;
1319 }
1320
1321 const struct export_operations udf_export_ops = {
1322 .encode_fh = udf_encode_fh,
1323 .fh_to_dentry = udf_fh_to_dentry,
1324 .fh_to_parent = udf_fh_to_parent,
1325 .get_parent = udf_get_parent,
1326 };
1327
1328 const struct inode_operations udf_dir_inode_operations = {
1329 .lookup = udf_lookup,
1330 .create = udf_create,
1331 .link = udf_link,
1332 .unlink = udf_unlink,
1333 .symlink = udf_symlink,
1334 .mkdir = udf_mkdir,
1335 .rmdir = udf_rmdir,
1336 .mknod = udf_mknod,
1337 .rename = udf_rename,
1338 .tmpfile = udf_tmpfile,
1339 };
1340 const struct inode_operations udf_symlink_inode_operations = {
1341 .readlink = generic_readlink,
1342 .follow_link = page_follow_link_light,
1343 .put_link = page_put_link,
1344 };
Linux with added FPC-III support