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Merge branch 'drm-next-3.18' of git://people.freedesktop.org/~agd5f/linux into drm...
[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 (!inode) {
274 return ERR_PTR(-EACCES);
275 }
276 } else
277 #endif /* UDF_RECOVERY */
278
279 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
280 struct kernel_lb_addr loc;
281
282 if (fibh.sbh != fibh.ebh)
283 brelse(fibh.ebh);
284 brelse(fibh.sbh);
285
286 loc = lelb_to_cpu(cfi.icb.extLocation);
287 inode = udf_iget(dir->i_sb, &loc);
288 if (!inode) {
289 return ERR_PTR(-EACCES);
290 }
291 }
292
293 return d_splice_alias(inode, dentry);
294 }
295
296 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
297 struct dentry *dentry,
298 struct udf_fileident_bh *fibh,
299 struct fileIdentDesc *cfi, int *err)
300 {
301 struct super_block *sb = dir->i_sb;
302 struct fileIdentDesc *fi = NULL;
303 unsigned char *name = NULL;
304 int namelen;
305 loff_t f_pos;
306 loff_t size = udf_ext0_offset(dir) + dir->i_size;
307 int nfidlen;
308 uint8_t lfi;
309 uint16_t liu;
310 int block;
311 struct kernel_lb_addr eloc;
312 uint32_t elen = 0;
313 sector_t offset;
314 struct extent_position epos = {};
315 struct udf_inode_info *dinfo;
316
317 fibh->sbh = fibh->ebh = NULL;
318 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
319 if (!name) {
320 *err = -ENOMEM;
321 goto out_err;
322 }
323
324 if (dentry) {
325 if (!dentry->d_name.len) {
326 *err = -EINVAL;
327 goto out_err;
328 }
329 namelen = udf_put_filename(sb, dentry->d_name.name, name,
330 dentry->d_name.len);
331 if (!namelen) {
332 *err = -ENAMETOOLONG;
333 goto out_err;
334 }
335 } else {
336 namelen = 0;
337 }
338
339 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
340
341 f_pos = udf_ext0_offset(dir);
342
343 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
344 dinfo = UDF_I(dir);
345 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
346 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
347 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
348 block = udf_get_lb_pblock(dir->i_sb,
349 &dinfo->i_location, 0);
350 fibh->soffset = fibh->eoffset = sb->s_blocksize;
351 goto add;
352 }
353 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
354 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
355 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
356 epos.offset -= sizeof(struct short_ad);
357 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
358 epos.offset -= sizeof(struct long_ad);
359 } else
360 offset = 0;
361
362 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
363 if (!fibh->sbh) {
364 *err = -EIO;
365 goto out_err;
366 }
367
368 block = dinfo->i_location.logicalBlockNum;
369 }
370
371 while (f_pos < size) {
372 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
373 &elen, &offset);
374
375 if (!fi) {
376 *err = -EIO;
377 goto out_err;
378 }
379
380 liu = le16_to_cpu(cfi->lengthOfImpUse);
381 lfi = cfi->lengthFileIdent;
382
383 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
384 if (((sizeof(struct fileIdentDesc) +
385 liu + lfi + 3) & ~3) == nfidlen) {
386 cfi->descTag.tagSerialNum = cpu_to_le16(1);
387 cfi->fileVersionNum = cpu_to_le16(1);
388 cfi->fileCharacteristics = 0;
389 cfi->lengthFileIdent = namelen;
390 cfi->lengthOfImpUse = cpu_to_le16(0);
391 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
392 name))
393 goto out_ok;
394 else {
395 *err = -EIO;
396 goto out_err;
397 }
398 }
399 }
400 }
401
402 add:
403 f_pos += nfidlen;
404
405 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
406 sb->s_blocksize - fibh->eoffset < nfidlen) {
407 brelse(epos.bh);
408 epos.bh = NULL;
409 fibh->soffset -= udf_ext0_offset(dir);
410 fibh->eoffset -= udf_ext0_offset(dir);
411 f_pos -= udf_ext0_offset(dir);
412 if (fibh->sbh != fibh->ebh)
413 brelse(fibh->ebh);
414 brelse(fibh->sbh);
415 fibh->sbh = fibh->ebh =
416 udf_expand_dir_adinicb(dir, &block, err);
417 if (!fibh->sbh)
418 goto out_err;
419 epos.block = dinfo->i_location;
420 epos.offset = udf_file_entry_alloc_offset(dir);
421 /* Load extent udf_expand_dir_adinicb() has created */
422 udf_current_aext(dir, &epos, &eloc, &elen, 1);
423 }
424
425 /* Entry fits into current block? */
426 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
427 fibh->soffset = fibh->eoffset;
428 fibh->eoffset += nfidlen;
429 if (fibh->sbh != fibh->ebh) {
430 brelse(fibh->sbh);
431 fibh->sbh = fibh->ebh;
432 }
433
434 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
435 block = dinfo->i_location.logicalBlockNum;
436 fi = (struct fileIdentDesc *)
437 (dinfo->i_ext.i_data +
438 fibh->soffset -
439 udf_ext0_offset(dir) +
440 dinfo->i_lenEAttr);
441 } else {
442 block = eloc.logicalBlockNum +
443 ((elen - 1) >>
444 dir->i_sb->s_blocksize_bits);
445 fi = (struct fileIdentDesc *)
446 (fibh->sbh->b_data + fibh->soffset);
447 }
448 } else {
449 /* Round up last extent in the file */
450 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
451 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
452 epos.offset -= sizeof(struct short_ad);
453 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
454 epos.offset -= sizeof(struct long_ad);
455 udf_write_aext(dir, &epos, &eloc, elen, 1);
456 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
457 - 1) & ~(sb->s_blocksize - 1);
458
459 fibh->soffset = fibh->eoffset - sb->s_blocksize;
460 fibh->eoffset += nfidlen - sb->s_blocksize;
461 if (fibh->sbh != fibh->ebh) {
462 brelse(fibh->sbh);
463 fibh->sbh = fibh->ebh;
464 }
465
466 block = eloc.logicalBlockNum + ((elen - 1) >>
467 dir->i_sb->s_blocksize_bits);
468 fibh->ebh = udf_bread(dir,
469 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
470 if (!fibh->ebh)
471 goto out_err;
472 /* Extents could have been merged, invalidate our position */
473 brelse(epos.bh);
474 epos.bh = NULL;
475 epos.block = dinfo->i_location;
476 epos.offset = udf_file_entry_alloc_offset(dir);
477
478 if (!fibh->soffset) {
479 /* Find the freshly allocated block */
480 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
481 (EXT_RECORDED_ALLOCATED >> 30))
482 ;
483 block = eloc.logicalBlockNum + ((elen - 1) >>
484 dir->i_sb->s_blocksize_bits);
485 brelse(fibh->sbh);
486 fibh->sbh = fibh->ebh;
487 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
488 } else {
489 fi = (struct fileIdentDesc *)
490 (fibh->sbh->b_data + sb->s_blocksize +
491 fibh->soffset);
492 }
493 }
494
495 memset(cfi, 0, sizeof(struct fileIdentDesc));
496 if (UDF_SB(sb)->s_udfrev >= 0x0200)
497 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
498 sizeof(struct tag));
499 else
500 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
501 sizeof(struct tag));
502 cfi->fileVersionNum = cpu_to_le16(1);
503 cfi->lengthFileIdent = namelen;
504 cfi->lengthOfImpUse = cpu_to_le16(0);
505 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
506 dir->i_size += nfidlen;
507 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
508 dinfo->i_lenAlloc += nfidlen;
509 else {
510 /* Find the last extent and truncate it to proper size */
511 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
512 (EXT_RECORDED_ALLOCATED >> 30))
513 ;
514 elen -= dinfo->i_lenExtents - dir->i_size;
515 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
516 epos.offset -= sizeof(struct short_ad);
517 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
518 epos.offset -= sizeof(struct long_ad);
519 udf_write_aext(dir, &epos, &eloc, elen, 1);
520 dinfo->i_lenExtents = dir->i_size;
521 }
522
523 mark_inode_dirty(dir);
524 goto out_ok;
525 } else {
526 *err = -EIO;
527 goto out_err;
528 }
529
530 out_err:
531 fi = NULL;
532 if (fibh->sbh != fibh->ebh)
533 brelse(fibh->ebh);
534 brelse(fibh->sbh);
535 out_ok:
536 brelse(epos.bh);
537 kfree(name);
538 return fi;
539 }
540
541 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
542 struct udf_fileident_bh *fibh,
543 struct fileIdentDesc *cfi)
544 {
545 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
546
547 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
548 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
549
550 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
551 }
552
553 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
554 bool excl)
555 {
556 struct udf_fileident_bh fibh;
557 struct inode *inode;
558 struct fileIdentDesc cfi, *fi;
559 int err;
560 struct udf_inode_info *iinfo;
561
562 inode = udf_new_inode(dir, mode, &err);
563 if (!inode) {
564 return err;
565 }
566
567 iinfo = UDF_I(inode);
568 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
569 inode->i_data.a_ops = &udf_adinicb_aops;
570 else
571 inode->i_data.a_ops = &udf_aops;
572 inode->i_op = &udf_file_inode_operations;
573 inode->i_fop = &udf_file_operations;
574 mark_inode_dirty(inode);
575
576 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
577 if (!fi) {
578 inode_dec_link_count(inode);
579 iput(inode);
580 return err;
581 }
582 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
583 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
584 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
585 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
586 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
587 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
588 mark_inode_dirty(dir);
589 if (fibh.sbh != fibh.ebh)
590 brelse(fibh.ebh);
591 brelse(fibh.sbh);
592 d_instantiate(dentry, inode);
593
594 return 0;
595 }
596
597 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
598 {
599 struct inode *inode;
600 struct udf_inode_info *iinfo;
601 int err;
602
603 inode = udf_new_inode(dir, mode, &err);
604 if (!inode)
605 return err;
606
607 iinfo = UDF_I(inode);
608 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
609 inode->i_data.a_ops = &udf_adinicb_aops;
610 else
611 inode->i_data.a_ops = &udf_aops;
612 inode->i_op = &udf_file_inode_operations;
613 inode->i_fop = &udf_file_operations;
614 mark_inode_dirty(inode);
615
616 d_tmpfile(dentry, inode);
617 return 0;
618 }
619
620 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
621 dev_t rdev)
622 {
623 struct inode *inode;
624 struct udf_fileident_bh fibh;
625 struct fileIdentDesc cfi, *fi;
626 int err;
627 struct udf_inode_info *iinfo;
628
629 if (!old_valid_dev(rdev))
630 return -EINVAL;
631
632 err = -EIO;
633 inode = udf_new_inode(dir, mode, &err);
634 if (!inode)
635 goto out;
636
637 iinfo = UDF_I(inode);
638 init_special_inode(inode, mode, rdev);
639 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
640 if (!fi) {
641 inode_dec_link_count(inode);
642 iput(inode);
643 return err;
644 }
645 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
646 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
647 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
648 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
649 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
650 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
651 mark_inode_dirty(dir);
652 mark_inode_dirty(inode);
653
654 if (fibh.sbh != fibh.ebh)
655 brelse(fibh.ebh);
656 brelse(fibh.sbh);
657 d_instantiate(dentry, inode);
658 err = 0;
659
660 out:
661 return err;
662 }
663
664 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
665 {
666 struct inode *inode;
667 struct udf_fileident_bh fibh;
668 struct fileIdentDesc cfi, *fi;
669 int err;
670 struct udf_inode_info *dinfo = UDF_I(dir);
671 struct udf_inode_info *iinfo;
672
673 err = -EIO;
674 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
675 if (!inode)
676 goto out;
677
678 iinfo = UDF_I(inode);
679 inode->i_op = &udf_dir_inode_operations;
680 inode->i_fop = &udf_dir_operations;
681 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
682 if (!fi) {
683 inode_dec_link_count(inode);
684 iput(inode);
685 goto out;
686 }
687 set_nlink(inode, 2);
688 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
689 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
690 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
691 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
692 cfi.fileCharacteristics =
693 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
694 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
695 brelse(fibh.sbh);
696 mark_inode_dirty(inode);
697
698 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
699 if (!fi) {
700 clear_nlink(inode);
701 mark_inode_dirty(inode);
702 iput(inode);
703 goto out;
704 }
705 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
706 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
707 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
708 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
709 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
710 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
711 inc_nlink(dir);
712 mark_inode_dirty(dir);
713 d_instantiate(dentry, inode);
714 if (fibh.sbh != fibh.ebh)
715 brelse(fibh.ebh);
716 brelse(fibh.sbh);
717 err = 0;
718
719 out:
720 return err;
721 }
722
723 static int empty_dir(struct inode *dir)
724 {
725 struct fileIdentDesc *fi, cfi;
726 struct udf_fileident_bh fibh;
727 loff_t f_pos;
728 loff_t size = udf_ext0_offset(dir) + dir->i_size;
729 int block;
730 struct kernel_lb_addr eloc;
731 uint32_t elen;
732 sector_t offset;
733 struct extent_position epos = {};
734 struct udf_inode_info *dinfo = UDF_I(dir);
735
736 f_pos = udf_ext0_offset(dir);
737 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
738
739 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
740 fibh.sbh = fibh.ebh = NULL;
741 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
742 &epos, &eloc, &elen, &offset) ==
743 (EXT_RECORDED_ALLOCATED >> 30)) {
744 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
745 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
746 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
747 epos.offset -= sizeof(struct short_ad);
748 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
749 epos.offset -= sizeof(struct long_ad);
750 } else
751 offset = 0;
752
753 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
754 if (!fibh.sbh) {
755 brelse(epos.bh);
756 return 0;
757 }
758 } else {
759 brelse(epos.bh);
760 return 0;
761 }
762
763 while (f_pos < size) {
764 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
765 &elen, &offset);
766 if (!fi) {
767 if (fibh.sbh != fibh.ebh)
768 brelse(fibh.ebh);
769 brelse(fibh.sbh);
770 brelse(epos.bh);
771 return 0;
772 }
773
774 if (cfi.lengthFileIdent &&
775 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
776 if (fibh.sbh != fibh.ebh)
777 brelse(fibh.ebh);
778 brelse(fibh.sbh);
779 brelse(epos.bh);
780 return 0;
781 }
782 }
783
784 if (fibh.sbh != fibh.ebh)
785 brelse(fibh.ebh);
786 brelse(fibh.sbh);
787 brelse(epos.bh);
788
789 return 1;
790 }
791
792 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
793 {
794 int retval;
795 struct inode *inode = dentry->d_inode;
796 struct udf_fileident_bh fibh;
797 struct fileIdentDesc *fi, cfi;
798 struct kernel_lb_addr tloc;
799
800 retval = -ENOENT;
801 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
802 if (!fi)
803 goto out;
804
805 retval = -EIO;
806 tloc = lelb_to_cpu(cfi.icb.extLocation);
807 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
808 goto end_rmdir;
809 retval = -ENOTEMPTY;
810 if (!empty_dir(inode))
811 goto end_rmdir;
812 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
813 if (retval)
814 goto end_rmdir;
815 if (inode->i_nlink != 2)
816 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
817 inode->i_nlink);
818 clear_nlink(inode);
819 inode->i_size = 0;
820 inode_dec_link_count(dir);
821 inode->i_ctime = dir->i_ctime = dir->i_mtime =
822 current_fs_time(dir->i_sb);
823 mark_inode_dirty(dir);
824
825 end_rmdir:
826 if (fibh.sbh != fibh.ebh)
827 brelse(fibh.ebh);
828 brelse(fibh.sbh);
829
830 out:
831 return retval;
832 }
833
834 static int udf_unlink(struct inode *dir, struct dentry *dentry)
835 {
836 int retval;
837 struct inode *inode = dentry->d_inode;
838 struct udf_fileident_bh fibh;
839 struct fileIdentDesc *fi;
840 struct fileIdentDesc cfi;
841 struct kernel_lb_addr tloc;
842
843 retval = -ENOENT;
844 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
845 if (!fi)
846 goto out;
847
848 retval = -EIO;
849 tloc = lelb_to_cpu(cfi.icb.extLocation);
850 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
851 goto end_unlink;
852
853 if (!inode->i_nlink) {
854 udf_debug("Deleting nonexistent file (%lu), %d\n",
855 inode->i_ino, inode->i_nlink);
856 set_nlink(inode, 1);
857 }
858 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
859 if (retval)
860 goto end_unlink;
861 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
862 mark_inode_dirty(dir);
863 inode_dec_link_count(inode);
864 inode->i_ctime = dir->i_ctime;
865 retval = 0;
866
867 end_unlink:
868 if (fibh.sbh != fibh.ebh)
869 brelse(fibh.ebh);
870 brelse(fibh.sbh);
871
872 out:
873 return retval;
874 }
875
876 static int udf_symlink(struct inode *dir, struct dentry *dentry,
877 const char *symname)
878 {
879 struct inode *inode;
880 struct pathComponent *pc;
881 const char *compstart;
882 struct udf_fileident_bh fibh;
883 struct extent_position epos = {};
884 int eoffset, elen = 0;
885 struct fileIdentDesc *fi;
886 struct fileIdentDesc cfi;
887 uint8_t *ea;
888 int err;
889 int block;
890 unsigned char *name = NULL;
891 int namelen;
892 struct udf_inode_info *iinfo;
893 struct super_block *sb = dir->i_sb;
894
895 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
896 if (!inode)
897 goto out;
898
899 iinfo = UDF_I(inode);
900 down_write(&iinfo->i_data_sem);
901 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
902 if (!name) {
903 err = -ENOMEM;
904 goto out_no_entry;
905 }
906
907 inode->i_data.a_ops = &udf_symlink_aops;
908 inode->i_op = &udf_symlink_inode_operations;
909
910 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
911 struct kernel_lb_addr eloc;
912 uint32_t bsize;
913
914 block = udf_new_block(sb, inode,
915 iinfo->i_location.partitionReferenceNum,
916 iinfo->i_location.logicalBlockNum, &err);
917 if (!block)
918 goto out_no_entry;
919 epos.block = iinfo->i_location;
920 epos.offset = udf_file_entry_alloc_offset(inode);
921 epos.bh = NULL;
922 eloc.logicalBlockNum = block;
923 eloc.partitionReferenceNum =
924 iinfo->i_location.partitionReferenceNum;
925 bsize = sb->s_blocksize;
926 iinfo->i_lenExtents = bsize;
927 udf_add_aext(inode, &epos, &eloc, bsize, 0);
928 brelse(epos.bh);
929
930 block = udf_get_pblock(sb, block,
931 iinfo->i_location.partitionReferenceNum,
932 0);
933 epos.bh = udf_tgetblk(sb, block);
934 lock_buffer(epos.bh);
935 memset(epos.bh->b_data, 0x00, bsize);
936 set_buffer_uptodate(epos.bh);
937 unlock_buffer(epos.bh);
938 mark_buffer_dirty_inode(epos.bh, inode);
939 ea = epos.bh->b_data + udf_ext0_offset(inode);
940 } else
941 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
942
943 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
944 pc = (struct pathComponent *)ea;
945
946 if (*symname == '/') {
947 do {
948 symname++;
949 } while (*symname == '/');
950
951 pc->componentType = 1;
952 pc->lengthComponentIdent = 0;
953 pc->componentFileVersionNum = 0;
954 elen += sizeof(struct pathComponent);
955 }
956
957 err = -ENAMETOOLONG;
958
959 while (*symname) {
960 if (elen + sizeof(struct pathComponent) > eoffset)
961 goto out_no_entry;
962
963 pc = (struct pathComponent *)(ea + elen);
964
965 compstart = symname;
966
967 do {
968 symname++;
969 } while (*symname && *symname != '/');
970
971 pc->componentType = 5;
972 pc->lengthComponentIdent = 0;
973 pc->componentFileVersionNum = 0;
974 if (compstart[0] == '.') {
975 if ((symname - compstart) == 1)
976 pc->componentType = 4;
977 else if ((symname - compstart) == 2 &&
978 compstart[1] == '.')
979 pc->componentType = 3;
980 }
981
982 if (pc->componentType == 5) {
983 namelen = udf_put_filename(sb, compstart, name,
984 symname - compstart);
985 if (!namelen)
986 goto out_no_entry;
987
988 if (elen + sizeof(struct pathComponent) + namelen >
989 eoffset)
990 goto out_no_entry;
991 else
992 pc->lengthComponentIdent = namelen;
993
994 memcpy(pc->componentIdent, name, namelen);
995 }
996
997 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
998
999 if (*symname) {
1000 do {
1001 symname++;
1002 } while (*symname == '/');
1003 }
1004 }
1005
1006 brelse(epos.bh);
1007 inode->i_size = elen;
1008 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1009 iinfo->i_lenAlloc = inode->i_size;
1010 else
1011 udf_truncate_tail_extent(inode);
1012 mark_inode_dirty(inode);
1013 up_write(&iinfo->i_data_sem);
1014
1015 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1016 if (!fi)
1017 goto out_fail;
1018 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1019 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1020 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1021 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1022 cpu_to_le32(lvid_get_unique_id(sb));
1023 }
1024 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1025 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1026 mark_inode_dirty(dir);
1027 if (fibh.sbh != fibh.ebh)
1028 brelse(fibh.ebh);
1029 brelse(fibh.sbh);
1030 d_instantiate(dentry, inode);
1031 err = 0;
1032
1033 out:
1034 kfree(name);
1035 return err;
1036
1037 out_no_entry:
1038 up_write(&iinfo->i_data_sem);
1039 out_fail:
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 kernel - Deliverables
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