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