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autofs4: Add d_manage() dentry operation
[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 struct nameidata *nd)
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, int mode,
554 struct nameidata *nd)
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->i_nlink--;
579 mark_inode_dirty(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_mknod(struct inode *dir, struct dentry *dentry, int mode,
599 dev_t rdev)
600 {
601 struct inode *inode;
602 struct udf_fileident_bh fibh;
603 struct fileIdentDesc cfi, *fi;
604 int err;
605 struct udf_inode_info *iinfo;
606
607 if (!old_valid_dev(rdev))
608 return -EINVAL;
609
610 err = -EIO;
611 inode = udf_new_inode(dir, mode, &err);
612 if (!inode)
613 goto out;
614
615 iinfo = UDF_I(inode);
616 init_special_inode(inode, mode, rdev);
617 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
618 if (!fi) {
619 inode->i_nlink--;
620 mark_inode_dirty(inode);
621 iput(inode);
622 return err;
623 }
624 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
625 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
626 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
627 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
628 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
629 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
630 mark_inode_dirty(dir);
631 mark_inode_dirty(inode);
632
633 if (fibh.sbh != fibh.ebh)
634 brelse(fibh.ebh);
635 brelse(fibh.sbh);
636 d_instantiate(dentry, inode);
637 err = 0;
638
639 out:
640 return err;
641 }
642
643 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
644 {
645 struct inode *inode;
646 struct udf_fileident_bh fibh;
647 struct fileIdentDesc cfi, *fi;
648 int err;
649 struct udf_inode_info *dinfo = UDF_I(dir);
650 struct udf_inode_info *iinfo;
651
652 err = -EMLINK;
653 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
654 goto out;
655
656 err = -EIO;
657 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
658 if (!inode)
659 goto out;
660
661 iinfo = UDF_I(inode);
662 inode->i_op = &udf_dir_inode_operations;
663 inode->i_fop = &udf_dir_operations;
664 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
665 if (!fi) {
666 inode->i_nlink--;
667 mark_inode_dirty(inode);
668 iput(inode);
669 goto out;
670 }
671 inode->i_nlink = 2;
672 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
673 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
674 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
675 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
676 cfi.fileCharacteristics =
677 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
678 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
679 brelse(fibh.sbh);
680 mark_inode_dirty(inode);
681
682 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
683 if (!fi) {
684 inode->i_nlink = 0;
685 mark_inode_dirty(inode);
686 iput(inode);
687 goto out;
688 }
689 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
690 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
691 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
692 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
693 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
694 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
695 inc_nlink(dir);
696 mark_inode_dirty(dir);
697 d_instantiate(dentry, inode);
698 if (fibh.sbh != fibh.ebh)
699 brelse(fibh.ebh);
700 brelse(fibh.sbh);
701 err = 0;
702
703 out:
704 return err;
705 }
706
707 static int empty_dir(struct inode *dir)
708 {
709 struct fileIdentDesc *fi, cfi;
710 struct udf_fileident_bh fibh;
711 loff_t f_pos;
712 loff_t size = udf_ext0_offset(dir) + dir->i_size;
713 int block;
714 struct kernel_lb_addr eloc;
715 uint32_t elen;
716 sector_t offset;
717 struct extent_position epos = {};
718 struct udf_inode_info *dinfo = UDF_I(dir);
719
720 f_pos = udf_ext0_offset(dir);
721 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
722
723 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
724 fibh.sbh = fibh.ebh = NULL;
725 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
726 &epos, &eloc, &elen, &offset) ==
727 (EXT_RECORDED_ALLOCATED >> 30)) {
728 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
729 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
730 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
731 epos.offset -= sizeof(struct short_ad);
732 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
733 epos.offset -= sizeof(struct long_ad);
734 } else
735 offset = 0;
736
737 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
738 if (!fibh.sbh) {
739 brelse(epos.bh);
740 return 0;
741 }
742 } else {
743 brelse(epos.bh);
744 return 0;
745 }
746
747 while (f_pos < size) {
748 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
749 &elen, &offset);
750 if (!fi) {
751 if (fibh.sbh != fibh.ebh)
752 brelse(fibh.ebh);
753 brelse(fibh.sbh);
754 brelse(epos.bh);
755 return 0;
756 }
757
758 if (cfi.lengthFileIdent &&
759 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
760 if (fibh.sbh != fibh.ebh)
761 brelse(fibh.ebh);
762 brelse(fibh.sbh);
763 brelse(epos.bh);
764 return 0;
765 }
766 }
767
768 if (fibh.sbh != fibh.ebh)
769 brelse(fibh.ebh);
770 brelse(fibh.sbh);
771 brelse(epos.bh);
772
773 return 1;
774 }
775
776 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
777 {
778 int retval;
779 struct inode *inode = dentry->d_inode;
780 struct udf_fileident_bh fibh;
781 struct fileIdentDesc *fi, cfi;
782 struct kernel_lb_addr tloc;
783
784 retval = -ENOENT;
785 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
786 if (!fi)
787 goto out;
788
789 retval = -EIO;
790 tloc = lelb_to_cpu(cfi.icb.extLocation);
791 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
792 goto end_rmdir;
793 retval = -ENOTEMPTY;
794 if (!empty_dir(inode))
795 goto end_rmdir;
796 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
797 if (retval)
798 goto end_rmdir;
799 if (inode->i_nlink != 2)
800 udf_warning(inode->i_sb, "udf_rmdir",
801 "empty directory has nlink != 2 (%d)",
802 inode->i_nlink);
803 clear_nlink(inode);
804 inode->i_size = 0;
805 inode_dec_link_count(dir);
806 inode->i_ctime = dir->i_ctime = dir->i_mtime =
807 current_fs_time(dir->i_sb);
808 mark_inode_dirty(dir);
809
810 end_rmdir:
811 if (fibh.sbh != fibh.ebh)
812 brelse(fibh.ebh);
813 brelse(fibh.sbh);
814
815 out:
816 return retval;
817 }
818
819 static int udf_unlink(struct inode *dir, struct dentry *dentry)
820 {
821 int retval;
822 struct inode *inode = dentry->d_inode;
823 struct udf_fileident_bh fibh;
824 struct fileIdentDesc *fi;
825 struct fileIdentDesc cfi;
826 struct kernel_lb_addr tloc;
827
828 retval = -ENOENT;
829 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
830 if (!fi)
831 goto out;
832
833 retval = -EIO;
834 tloc = lelb_to_cpu(cfi.icb.extLocation);
835 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
836 goto end_unlink;
837
838 if (!inode->i_nlink) {
839 udf_debug("Deleting nonexistent file (%lu), %d\n",
840 inode->i_ino, inode->i_nlink);
841 inode->i_nlink = 1;
842 }
843 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
844 if (retval)
845 goto end_unlink;
846 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
847 mark_inode_dirty(dir);
848 inode_dec_link_count(inode);
849 inode->i_ctime = dir->i_ctime;
850 retval = 0;
851
852 end_unlink:
853 if (fibh.sbh != fibh.ebh)
854 brelse(fibh.ebh);
855 brelse(fibh.sbh);
856
857 out:
858 return retval;
859 }
860
861 static int udf_symlink(struct inode *dir, struct dentry *dentry,
862 const char *symname)
863 {
864 struct inode *inode;
865 struct pathComponent *pc;
866 const char *compstart;
867 struct udf_fileident_bh fibh;
868 struct extent_position epos = {};
869 int eoffset, elen = 0;
870 struct fileIdentDesc *fi;
871 struct fileIdentDesc cfi;
872 uint8_t *ea;
873 int err;
874 int block;
875 unsigned char *name = NULL;
876 int namelen;
877 struct udf_inode_info *iinfo;
878 struct super_block *sb = dir->i_sb;
879
880 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
881 if (!inode)
882 goto out;
883
884 iinfo = UDF_I(inode);
885 down_write(&iinfo->i_data_sem);
886 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
887 if (!name) {
888 err = -ENOMEM;
889 goto out_no_entry;
890 }
891
892 inode->i_data.a_ops = &udf_symlink_aops;
893 inode->i_op = &udf_symlink_inode_operations;
894
895 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
896 struct kernel_lb_addr eloc;
897 uint32_t bsize;
898
899 block = udf_new_block(sb, inode,
900 iinfo->i_location.partitionReferenceNum,
901 iinfo->i_location.logicalBlockNum, &err);
902 if (!block)
903 goto out_no_entry;
904 epos.block = iinfo->i_location;
905 epos.offset = udf_file_entry_alloc_offset(inode);
906 epos.bh = NULL;
907 eloc.logicalBlockNum = block;
908 eloc.partitionReferenceNum =
909 iinfo->i_location.partitionReferenceNum;
910 bsize = sb->s_blocksize;
911 iinfo->i_lenExtents = bsize;
912 udf_add_aext(inode, &epos, &eloc, bsize, 0);
913 brelse(epos.bh);
914
915 block = udf_get_pblock(sb, block,
916 iinfo->i_location.partitionReferenceNum,
917 0);
918 epos.bh = udf_tgetblk(sb, block);
919 lock_buffer(epos.bh);
920 memset(epos.bh->b_data, 0x00, bsize);
921 set_buffer_uptodate(epos.bh);
922 unlock_buffer(epos.bh);
923 mark_buffer_dirty_inode(epos.bh, inode);
924 ea = epos.bh->b_data + udf_ext0_offset(inode);
925 } else
926 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
927
928 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
929 pc = (struct pathComponent *)ea;
930
931 if (*symname == '/') {
932 do {
933 symname++;
934 } while (*symname == '/');
935
936 pc->componentType = 1;
937 pc->lengthComponentIdent = 0;
938 pc->componentFileVersionNum = 0;
939 elen += sizeof(struct pathComponent);
940 }
941
942 err = -ENAMETOOLONG;
943
944 while (*symname) {
945 if (elen + sizeof(struct pathComponent) > eoffset)
946 goto out_no_entry;
947
948 pc = (struct pathComponent *)(ea + elen);
949
950 compstart = symname;
951
952 do {
953 symname++;
954 } while (*symname && *symname != '/');
955
956 pc->componentType = 5;
957 pc->lengthComponentIdent = 0;
958 pc->componentFileVersionNum = 0;
959 if (compstart[0] == '.') {
960 if ((symname - compstart) == 1)
961 pc->componentType = 4;
962 else if ((symname - compstart) == 2 &&
963 compstart[1] == '.')
964 pc->componentType = 3;
965 }
966
967 if (pc->componentType == 5) {
968 namelen = udf_put_filename(sb, compstart, name,
969 symname - compstart);
970 if (!namelen)
971 goto out_no_entry;
972
973 if (elen + sizeof(struct pathComponent) + namelen >
974 eoffset)
975 goto out_no_entry;
976 else
977 pc->lengthComponentIdent = namelen;
978
979 memcpy(pc->componentIdent, name, namelen);
980 }
981
982 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
983
984 if (*symname) {
985 do {
986 symname++;
987 } while (*symname == '/');
988 }
989 }
990
991 brelse(epos.bh);
992 inode->i_size = elen;
993 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
994 iinfo->i_lenAlloc = inode->i_size;
995 else
996 udf_truncate_tail_extent(inode);
997 mark_inode_dirty(inode);
998
999 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1000 if (!fi)
1001 goto out_no_entry;
1002 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
1003 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1004 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1005 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1006 cpu_to_le32(lvid_get_unique_id(sb));
1007 }
1008 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1009 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1010 mark_inode_dirty(dir);
1011 up_write(&iinfo->i_data_sem);
1012 if (fibh.sbh != fibh.ebh)
1013 brelse(fibh.ebh);
1014 brelse(fibh.sbh);
1015 d_instantiate(dentry, inode);
1016 err = 0;
1017
1018 out:
1019 kfree(name);
1020 return err;
1021
1022 out_no_entry:
1023 up_write(&iinfo->i_data_sem);
1024 inode_dec_link_count(inode);
1025 iput(inode);
1026 goto out;
1027 }
1028
1029 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1030 struct dentry *dentry)
1031 {
1032 struct inode *inode = old_dentry->d_inode;
1033 struct udf_fileident_bh fibh;
1034 struct fileIdentDesc cfi, *fi;
1035 int err;
1036
1037 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1038 return -EMLINK;
1039 }
1040
1041 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1042 if (!fi) {
1043 return err;
1044 }
1045 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1046 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1047 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1048 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1049 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1050 }
1051 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1052 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1053 mark_inode_dirty(dir);
1054
1055 if (fibh.sbh != fibh.ebh)
1056 brelse(fibh.ebh);
1057 brelse(fibh.sbh);
1058 inc_nlink(inode);
1059 inode->i_ctime = current_fs_time(inode->i_sb);
1060 mark_inode_dirty(inode);
1061 ihold(inode);
1062 d_instantiate(dentry, inode);
1063
1064 return 0;
1065 }
1066
1067 /* Anybody can rename anything with this: the permission checks are left to the
1068 * higher-level routines.
1069 */
1070 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1071 struct inode *new_dir, struct dentry *new_dentry)
1072 {
1073 struct inode *old_inode = old_dentry->d_inode;
1074 struct inode *new_inode = new_dentry->d_inode;
1075 struct udf_fileident_bh ofibh, nfibh;
1076 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1077 struct fileIdentDesc ocfi, ncfi;
1078 struct buffer_head *dir_bh = NULL;
1079 int retval = -ENOENT;
1080 struct kernel_lb_addr tloc;
1081 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1082
1083 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1084 if (ofi) {
1085 if (ofibh.sbh != ofibh.ebh)
1086 brelse(ofibh.ebh);
1087 brelse(ofibh.sbh);
1088 }
1089 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1090 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1091 != old_inode->i_ino)
1092 goto end_rename;
1093
1094 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1095 if (nfi) {
1096 if (!new_inode) {
1097 if (nfibh.sbh != nfibh.ebh)
1098 brelse(nfibh.ebh);
1099 brelse(nfibh.sbh);
1100 nfi = NULL;
1101 }
1102 }
1103 if (S_ISDIR(old_inode->i_mode)) {
1104 int offset = udf_ext0_offset(old_inode);
1105
1106 if (new_inode) {
1107 retval = -ENOTEMPTY;
1108 if (!empty_dir(new_inode))
1109 goto end_rename;
1110 }
1111 retval = -EIO;
1112 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1113 dir_fi = udf_get_fileident(
1114 old_iinfo->i_ext.i_data -
1115 (old_iinfo->i_efe ?
1116 sizeof(struct extendedFileEntry) :
1117 sizeof(struct fileEntry)),
1118 old_inode->i_sb->s_blocksize, &offset);
1119 } else {
1120 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1121 if (!dir_bh)
1122 goto end_rename;
1123 dir_fi = udf_get_fileident(dir_bh->b_data,
1124 old_inode->i_sb->s_blocksize, &offset);
1125 }
1126 if (!dir_fi)
1127 goto end_rename;
1128 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1129 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1130 old_dir->i_ino)
1131 goto end_rename;
1132
1133 retval = -EMLINK;
1134 if (!new_inode &&
1135 new_dir->i_nlink >=
1136 (256 << sizeof(new_dir->i_nlink)) - 1)
1137 goto end_rename;
1138 }
1139 if (!nfi) {
1140 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1141 &retval);
1142 if (!nfi)
1143 goto end_rename;
1144 }
1145
1146 /*
1147 * Like most other Unix systems, set the ctime for inodes on a
1148 * rename.
1149 */
1150 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1151 mark_inode_dirty(old_inode);
1152
1153 /*
1154 * ok, that's it
1155 */
1156 ncfi.fileVersionNum = ocfi.fileVersionNum;
1157 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1158 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1159 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1160
1161 /* The old fid may have moved - find it again */
1162 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1163 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1164
1165 if (new_inode) {
1166 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1167 inode_dec_link_count(new_inode);
1168 }
1169 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1170 mark_inode_dirty(old_dir);
1171
1172 if (dir_fi) {
1173 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1174 udf_update_tag((char *)dir_fi,
1175 (sizeof(struct fileIdentDesc) +
1176 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1177 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1178 mark_inode_dirty(old_inode);
1179 else
1180 mark_buffer_dirty_inode(dir_bh, old_inode);
1181
1182 inode_dec_link_count(old_dir);
1183 if (new_inode)
1184 inode_dec_link_count(new_inode);
1185 else {
1186 inc_nlink(new_dir);
1187 mark_inode_dirty(new_dir);
1188 }
1189 }
1190
1191 if (ofi) {
1192 if (ofibh.sbh != ofibh.ebh)
1193 brelse(ofibh.ebh);
1194 brelse(ofibh.sbh);
1195 }
1196
1197 retval = 0;
1198
1199 end_rename:
1200 brelse(dir_bh);
1201 if (nfi) {
1202 if (nfibh.sbh != nfibh.ebh)
1203 brelse(nfibh.ebh);
1204 brelse(nfibh.sbh);
1205 }
1206
1207 return retval;
1208 }
1209
1210 static struct dentry *udf_get_parent(struct dentry *child)
1211 {
1212 struct kernel_lb_addr tloc;
1213 struct inode *inode = NULL;
1214 struct qstr dotdot = {.name = "..", .len = 2};
1215 struct fileIdentDesc cfi;
1216 struct udf_fileident_bh fibh;
1217
1218 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1219 goto out_unlock;
1220
1221 if (fibh.sbh != fibh.ebh)
1222 brelse(fibh.ebh);
1223 brelse(fibh.sbh);
1224
1225 tloc = lelb_to_cpu(cfi.icb.extLocation);
1226 inode = udf_iget(child->d_inode->i_sb, &tloc);
1227 if (!inode)
1228 goto out_unlock;
1229
1230 return d_obtain_alias(inode);
1231 out_unlock:
1232 return ERR_PTR(-EACCES);
1233 }
1234
1235
1236 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1237 u16 partref, __u32 generation)
1238 {
1239 struct inode *inode;
1240 struct kernel_lb_addr loc;
1241
1242 if (block == 0)
1243 return ERR_PTR(-ESTALE);
1244
1245 loc.logicalBlockNum = block;
1246 loc.partitionReferenceNum = partref;
1247 inode = udf_iget(sb, &loc);
1248
1249 if (inode == NULL)
1250 return ERR_PTR(-ENOMEM);
1251
1252 if (generation && inode->i_generation != generation) {
1253 iput(inode);
1254 return ERR_PTR(-ESTALE);
1255 }
1256 return d_obtain_alias(inode);
1257 }
1258
1259 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1260 struct fid *fid, int fh_len, int fh_type)
1261 {
1262 if ((fh_len != 3 && fh_len != 5) ||
1263 (fh_type != FILEID_UDF_WITH_PARENT &&
1264 fh_type != FILEID_UDF_WITHOUT_PARENT))
1265 return NULL;
1266
1267 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1268 fid->udf.generation);
1269 }
1270
1271 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1272 struct fid *fid, int fh_len, int fh_type)
1273 {
1274 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1275 return NULL;
1276
1277 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1278 fid->udf.parent_partref,
1279 fid->udf.parent_generation);
1280 }
1281 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1282 int connectable)
1283 {
1284 int len = *lenp;
1285 struct inode *inode = de->d_inode;
1286 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1287 struct fid *fid = (struct fid *)fh;
1288 int type = FILEID_UDF_WITHOUT_PARENT;
1289
1290 if (len < 3 || (connectable && len < 5))
1291 return 255;
1292
1293 *lenp = 3;
1294 fid->udf.block = location.logicalBlockNum;
1295 fid->udf.partref = location.partitionReferenceNum;
1296 fid->udf.generation = inode->i_generation;
1297
1298 if (connectable && !S_ISDIR(inode->i_mode)) {
1299 spin_lock(&de->d_lock);
1300 inode = de->d_parent->d_inode;
1301 location = UDF_I(inode)->i_location;
1302 fid->udf.parent_block = location.logicalBlockNum;
1303 fid->udf.parent_partref = location.partitionReferenceNum;
1304 fid->udf.parent_generation = inode->i_generation;
1305 spin_unlock(&de->d_lock);
1306 *lenp = 5;
1307 type = FILEID_UDF_WITH_PARENT;
1308 }
1309
1310 return type;
1311 }
1312
1313 const struct export_operations udf_export_ops = {
1314 .encode_fh = udf_encode_fh,
1315 .fh_to_dentry = udf_fh_to_dentry,
1316 .fh_to_parent = udf_fh_to_parent,
1317 .get_parent = udf_get_parent,
1318 };
1319
1320 const struct inode_operations udf_dir_inode_operations = {
1321 .lookup = udf_lookup,
1322 .create = udf_create,
1323 .link = udf_link,
1324 .unlink = udf_unlink,
1325 .symlink = udf_symlink,
1326 .mkdir = udf_mkdir,
1327 .rmdir = udf_rmdir,
1328 .mknod = udf_mknod,
1329 .rename = udf_rename,
1330 };
1331 const struct inode_operations udf_symlink_inode_operations = {
1332 .readlink = generic_readlink,
1333 .follow_link = page_follow_link_light,
1334 .put_link = page_put_link,
1335 };
Linux kernel - Deliverables
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