?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.14.215
[linux/fpc-iii.git] / fs / udf / namei.c
blob041bf34f781f8a5e3d0ccbbff99a4af7d59a7645
1 /*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
15 *
16 * HISTORY
17 *
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
20 */
21
22 #include "udfdecl.h"
23
24 #include "udf_i.h"
25 #include "udf_sb.h"
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/sched.h>
31 #include <linux/crc-itu-t.h>
32 #include <linux/exportfs.h>
33
34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
35 const unsigned char *name2)
36 {
37 if (len1 != len2)
38 return 0;
39
40 return !memcmp(name1, name2, len1);
41 }
42
43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
45 uint8_t *impuse, uint8_t *fileident)
46 {
47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
48 uint16_t crc;
49 int offset;
50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
51 uint8_t lfi = cfi->lengthFileIdent;
52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
53 sizeof(struct fileIdentDesc);
54 int adinicb = 0;
55
56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
57 adinicb = 1;
58
59 offset = fibh->soffset + sizeof(struct fileIdentDesc);
60
61 if (impuse) {
62 if (adinicb || (offset + liu < 0)) {
63 memcpy((uint8_t *)sfi->impUse, impuse, liu);
64 } else if (offset >= 0) {
65 memcpy(fibh->ebh->b_data + offset, impuse, liu);
66 } else {
67 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
68 memcpy(fibh->ebh->b_data, impuse - offset,
69 liu + offset);
70 }
71 }
72
73 offset += liu;
74
75 if (fileident) {
76 if (adinicb || (offset + lfi < 0)) {
77 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
78 } else if (offset >= 0) {
79 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
80 } else {
81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
82 -offset);
83 memcpy(fibh->ebh->b_data, fileident - offset,
84 lfi + offset);
85 }
86 }
87
88 offset += lfi;
89
90 if (adinicb || (offset + padlen < 0)) {
91 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
92 } else if (offset >= 0) {
93 memset(fibh->ebh->b_data + offset, 0x00, padlen);
94 } else {
95 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
96 memset(fibh->ebh->b_data, 0x00, padlen + offset);
97 }
98
99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
100 sizeof(struct fileIdentDesc) - sizeof(struct tag));
101
102 if (fibh->sbh == fibh->ebh) {
103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
104 crclen + sizeof(struct tag) -
105 sizeof(struct fileIdentDesc));
106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
107 crc = crc_itu_t(crc, fibh->ebh->b_data +
108 sizeof(struct fileIdentDesc) +
109 fibh->soffset,
110 crclen + sizeof(struct tag) -
111 sizeof(struct fileIdentDesc));
112 } else {
113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
114 -fibh->soffset - sizeof(struct fileIdentDesc));
115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
116 }
117
118 cfi->descTag.descCRC = cpu_to_le16(crc);
119 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
121
122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
123 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
124 sizeof(struct fileIdentDesc));
125 } else {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
128 sizeof(struct fileIdentDesc) + fibh->soffset);
129 }
130
131 if (adinicb) {
132 mark_inode_dirty(inode);
133 } else {
134 if (fibh->sbh != fibh->ebh)
135 mark_buffer_dirty_inode(fibh->ebh, inode);
136 mark_buffer_dirty_inode(fibh->sbh, inode);
137 }
138 return 0;
139 }
140
141 /**
142 * udf_find_entry - find entry in given directory.
143 *
144 * @dir: directory inode to search in
145 * @child: qstr of the name
146 * @fibh: buffer head / inode with file identifier descriptor we found
147 * @cfi: found file identifier descriptor with given name
148 *
149 * This function searches in the directory @dir for a file name @child. When
150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
151 * directories) containing the file identifier descriptor (FID). In that case
152 * the function returns pointer to the FID in the buffer or inode - but note
153 * that FID may be split among two buffers (blocks) so accessing it via that
154 * pointer isn't easily possible. This pointer can be used only as an iterator
155 * for other directory manipulation functions. For inspection of the FID @cfi
156 * can be used - the found FID is copied there.
157 *
158 * Returns pointer to FID, NULL when nothing found, or error code.
159 */
160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
161 const struct qstr *child,
162 struct udf_fileident_bh *fibh,
163 struct fileIdentDesc *cfi)
164 {
165 struct fileIdentDesc *fi = NULL;
166 loff_t f_pos;
167 int block, flen;
168 unsigned char *fname = NULL, *copy_name = NULL;
169 unsigned char *nameptr;
170 uint8_t lfi;
171 uint16_t liu;
172 loff_t size;
173 struct kernel_lb_addr eloc;
174 uint32_t elen;
175 sector_t offset;
176 struct extent_position epos = {};
177 struct udf_inode_info *dinfo = UDF_I(dir);
178 int isdotdot = child->len == 2 &&
179 child->name[0] == '.' && child->name[1] == '.';
180 struct super_block *sb = dir->i_sb;
181
182 size = udf_ext0_offset(dir) + dir->i_size;
183 f_pos = udf_ext0_offset(dir);
184
185 fibh->sbh = fibh->ebh = NULL;
186 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
187 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
188 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
189 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
190 fi = ERR_PTR(-EIO);
191 goto out_err;
192 }
193
194 block = udf_get_lb_pblock(sb, &eloc, offset);
195 if ((++offset << sb->s_blocksize_bits) < elen) {
196 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
197 epos.offset -= sizeof(struct short_ad);
198 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
199 epos.offset -= sizeof(struct long_ad);
200 } else
201 offset = 0;
202
203 fibh->sbh = fibh->ebh = udf_tread(sb, block);
204 if (!fibh->sbh) {
205 fi = ERR_PTR(-EIO);
206 goto out_err;
207 }
208 }
209
210 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
211 if (!fname) {
212 fi = ERR_PTR(-ENOMEM);
213 goto out_err;
214 }
215
216 while (f_pos < size) {
217 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
218 &elen, &offset);
219 if (!fi) {
220 fi = ERR_PTR(-EIO);
221 goto out_err;
222 }
223
224 liu = le16_to_cpu(cfi->lengthOfImpUse);
225 lfi = cfi->lengthFileIdent;
226
227 if (fibh->sbh == fibh->ebh) {
228 nameptr = fi->fileIdent + liu;
229 } else {
230 int poffset; /* Unpaded ending offset */
231
232 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
233 liu + lfi;
234
235 if (poffset >= lfi)
236 nameptr = (uint8_t *)(fibh->ebh->b_data +
237 poffset - lfi);
238 else {
239 if (!copy_name) {
240 copy_name = kmalloc(UDF_NAME_LEN,
241 GFP_NOFS);
242 if (!copy_name) {
243 fi = ERR_PTR(-ENOMEM);
244 goto out_err;
245 }
246 }
247 nameptr = copy_name;
248 memcpy(nameptr, fi->fileIdent + liu,
249 lfi - poffset);
250 memcpy(nameptr + lfi - poffset,
251 fibh->ebh->b_data, poffset);
252 }
253 }
254
255 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
256 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
257 continue;
258 }
259
260 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
261 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
262 continue;
263 }
264
265 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
266 isdotdot)
267 goto out_ok;
268
269 if (!lfi)
270 continue;
271
272 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
273 if (flen < 0) {
274 fi = ERR_PTR(flen);
275 goto out_err;
276 }
277
278 if (udf_match(flen, fname, child->len, child->name))
279 goto out_ok;
280 }
281
282 fi = NULL;
283 out_err:
284 if (fibh->sbh != fibh->ebh)
285 brelse(fibh->ebh);
286 brelse(fibh->sbh);
287 out_ok:
288 brelse(epos.bh);
289 kfree(fname);
290 kfree(copy_name);
291
292 return fi;
293 }
294
295 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
296 unsigned int flags)
297 {
298 struct inode *inode = NULL;
299 struct fileIdentDesc cfi;
300 struct udf_fileident_bh fibh;
301 struct fileIdentDesc *fi;
302
303 if (dentry->d_name.len > UDF_NAME_LEN)
304 return ERR_PTR(-ENAMETOOLONG);
305
306 #ifdef UDF_RECOVERY
307 /* temporary shorthand for specifying files by inode number */
308 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
309 struct kernel_lb_addr lb = {
310 .logicalBlockNum = 0,
311 .partitionReferenceNum =
312 simple_strtoul(dentry->d_name.name + 3,
313 NULL, 0),
314 };
315 inode = udf_iget(dir->i_sb, lb);
316 if (IS_ERR(inode))
317 return inode;
318 } else
319 #endif /* UDF_RECOVERY */
320
321 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
322 if (IS_ERR(fi))
323 return ERR_CAST(fi);
324
325 if (fi) {
326 struct kernel_lb_addr loc;
327
328 if (fibh.sbh != fibh.ebh)
329 brelse(fibh.ebh);
330 brelse(fibh.sbh);
331
332 loc = lelb_to_cpu(cfi.icb.extLocation);
333 inode = udf_iget(dir->i_sb, &loc);
334 if (IS_ERR(inode))
335 return ERR_CAST(inode);
336 }
337
338 return d_splice_alias(inode, dentry);
339 }
340
341 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
342 struct dentry *dentry,
343 struct udf_fileident_bh *fibh,
344 struct fileIdentDesc *cfi, int *err)
345 {
346 struct super_block *sb = dir->i_sb;
347 struct fileIdentDesc *fi = NULL;
348 unsigned char *name = NULL;
349 int namelen;
350 loff_t f_pos;
351 loff_t size = udf_ext0_offset(dir) + dir->i_size;
352 int nfidlen;
353 uint8_t lfi;
354 uint16_t liu;
355 int block;
356 struct kernel_lb_addr eloc;
357 uint32_t elen = 0;
358 sector_t offset;
359 struct extent_position epos = {};
360 struct udf_inode_info *dinfo;
361
362 fibh->sbh = fibh->ebh = NULL;
363 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
364 if (!name) {
365 *err = -ENOMEM;
366 goto out_err;
367 }
368
369 if (dentry) {
370 if (!dentry->d_name.len) {
371 *err = -EINVAL;
372 goto out_err;
373 }
374 namelen = udf_put_filename(sb, dentry->d_name.name,
375 dentry->d_name.len,
376 name, UDF_NAME_LEN_CS0);
377 if (!namelen) {
378 *err = -ENAMETOOLONG;
379 goto out_err;
380 }
381 } else {
382 namelen = 0;
383 }
384
385 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
386
387 f_pos = udf_ext0_offset(dir);
388
389 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
390 dinfo = UDF_I(dir);
391 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
392 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
393 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
394 block = udf_get_lb_pblock(dir->i_sb,
395 &dinfo->i_location, 0);
396 fibh->soffset = fibh->eoffset = sb->s_blocksize;
397 goto add;
398 }
399 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
400 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
401 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
402 epos.offset -= sizeof(struct short_ad);
403 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
404 epos.offset -= sizeof(struct long_ad);
405 } else
406 offset = 0;
407
408 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
409 if (!fibh->sbh) {
410 *err = -EIO;
411 goto out_err;
412 }
413
414 block = dinfo->i_location.logicalBlockNum;
415 }
416
417 while (f_pos < size) {
418 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
419 &elen, &offset);
420
421 if (!fi) {
422 *err = -EIO;
423 goto out_err;
424 }
425
426 liu = le16_to_cpu(cfi->lengthOfImpUse);
427 lfi = cfi->lengthFileIdent;
428
429 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
430 if (((sizeof(struct fileIdentDesc) +
431 liu + lfi + 3) & ~3) == nfidlen) {
432 cfi->descTag.tagSerialNum = cpu_to_le16(1);
433 cfi->fileVersionNum = cpu_to_le16(1);
434 cfi->fileCharacteristics = 0;
435 cfi->lengthFileIdent = namelen;
436 cfi->lengthOfImpUse = cpu_to_le16(0);
437 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
438 name))
439 goto out_ok;
440 else {
441 *err = -EIO;
442 goto out_err;
443 }
444 }
445 }
446 }
447
448 add:
449 f_pos += nfidlen;
450
451 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
452 sb->s_blocksize - fibh->eoffset < nfidlen) {
453 brelse(epos.bh);
454 epos.bh = NULL;
455 fibh->soffset -= udf_ext0_offset(dir);
456 fibh->eoffset -= udf_ext0_offset(dir);
457 f_pos -= udf_ext0_offset(dir);
458 if (fibh->sbh != fibh->ebh)
459 brelse(fibh->ebh);
460 brelse(fibh->sbh);
461 fibh->sbh = fibh->ebh =
462 udf_expand_dir_adinicb(dir, &block, err);
463 if (!fibh->sbh)
464 goto out_err;
465 epos.block = dinfo->i_location;
466 epos.offset = udf_file_entry_alloc_offset(dir);
467 /* Load extent udf_expand_dir_adinicb() has created */
468 udf_current_aext(dir, &epos, &eloc, &elen, 1);
469 }
470
471 /* Entry fits into current block? */
472 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
473 fibh->soffset = fibh->eoffset;
474 fibh->eoffset += nfidlen;
475 if (fibh->sbh != fibh->ebh) {
476 brelse(fibh->sbh);
477 fibh->sbh = fibh->ebh;
478 }
479
480 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
481 block = dinfo->i_location.logicalBlockNum;
482 fi = (struct fileIdentDesc *)
483 (dinfo->i_ext.i_data +
484 fibh->soffset -
485 udf_ext0_offset(dir) +
486 dinfo->i_lenEAttr);
487 } else {
488 block = eloc.logicalBlockNum +
489 ((elen - 1) >>
490 dir->i_sb->s_blocksize_bits);
491 fi = (struct fileIdentDesc *)
492 (fibh->sbh->b_data + fibh->soffset);
493 }
494 } else {
495 /* Round up last extent in the file */
496 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
497 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
498 epos.offset -= sizeof(struct short_ad);
499 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
500 epos.offset -= sizeof(struct long_ad);
501 udf_write_aext(dir, &epos, &eloc, elen, 1);
502 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
503 - 1) & ~(sb->s_blocksize - 1);
504
505 fibh->soffset = fibh->eoffset - sb->s_blocksize;
506 fibh->eoffset += nfidlen - sb->s_blocksize;
507 if (fibh->sbh != fibh->ebh) {
508 brelse(fibh->sbh);
509 fibh->sbh = fibh->ebh;
510 }
511
512 block = eloc.logicalBlockNum + ((elen - 1) >>
513 dir->i_sb->s_blocksize_bits);
514 fibh->ebh = udf_bread(dir,
515 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
516 if (!fibh->ebh)
517 goto out_err;
518 /* Extents could have been merged, invalidate our position */
519 brelse(epos.bh);
520 epos.bh = NULL;
521 epos.block = dinfo->i_location;
522 epos.offset = udf_file_entry_alloc_offset(dir);
523
524 if (!fibh->soffset) {
525 /* Find the freshly allocated block */
526 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
527 (EXT_RECORDED_ALLOCATED >> 30))
528 ;
529 block = eloc.logicalBlockNum + ((elen - 1) >>
530 dir->i_sb->s_blocksize_bits);
531 brelse(fibh->sbh);
532 fibh->sbh = fibh->ebh;
533 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
534 } else {
535 fi = (struct fileIdentDesc *)
536 (fibh->sbh->b_data + sb->s_blocksize +
537 fibh->soffset);
538 }
539 }
540
541 memset(cfi, 0, sizeof(struct fileIdentDesc));
542 if (UDF_SB(sb)->s_udfrev >= 0x0200)
543 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
544 sizeof(struct tag));
545 else
546 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
547 sizeof(struct tag));
548 cfi->fileVersionNum = cpu_to_le16(1);
549 cfi->lengthFileIdent = namelen;
550 cfi->lengthOfImpUse = cpu_to_le16(0);
551 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
552 dir->i_size += nfidlen;
553 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
554 dinfo->i_lenAlloc += nfidlen;
555 else {
556 /* Find the last extent and truncate it to proper size */
557 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
558 (EXT_RECORDED_ALLOCATED >> 30))
559 ;
560 elen -= dinfo->i_lenExtents - dir->i_size;
561 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
562 epos.offset -= sizeof(struct short_ad);
563 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
564 epos.offset -= sizeof(struct long_ad);
565 udf_write_aext(dir, &epos, &eloc, elen, 1);
566 dinfo->i_lenExtents = dir->i_size;
567 }
568
569 mark_inode_dirty(dir);
570 goto out_ok;
571 } else {
572 *err = -EIO;
573 goto out_err;
574 }
575
576 out_err:
577 fi = NULL;
578 if (fibh->sbh != fibh->ebh)
579 brelse(fibh->ebh);
580 brelse(fibh->sbh);
581 out_ok:
582 brelse(epos.bh);
583 kfree(name);
584 return fi;
585 }
586
587 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
588 struct udf_fileident_bh *fibh,
589 struct fileIdentDesc *cfi)
590 {
591 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
592
593 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
594 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
595
596 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
597 }
598
599 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
600 {
601 struct udf_inode_info *iinfo = UDF_I(inode);
602 struct inode *dir = d_inode(dentry->d_parent);
603 struct udf_fileident_bh fibh;
604 struct fileIdentDesc cfi, *fi;
605 int err;
606
607 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
608 if (unlikely(!fi)) {
609 inode_dec_link_count(inode);
610 unlock_new_inode(inode);
611 iput(inode);
612 return err;
613 }
614 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
615 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
616 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
617 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
618 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
619 dir->i_ctime = dir->i_mtime = current_time(dir);
620 mark_inode_dirty(dir);
621 if (fibh.sbh != fibh.ebh)
622 brelse(fibh.ebh);
623 brelse(fibh.sbh);
624 d_instantiate_new(dentry, inode);
625
626 return 0;
627 }
628
629 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
630 bool excl)
631 {
632 struct inode *inode = udf_new_inode(dir, mode);
633
634 if (IS_ERR(inode))
635 return PTR_ERR(inode);
636
637 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
638 inode->i_data.a_ops = &udf_adinicb_aops;
639 else
640 inode->i_data.a_ops = &udf_aops;
641 inode->i_op = &udf_file_inode_operations;
642 inode->i_fop = &udf_file_operations;
643 mark_inode_dirty(inode);
644
645 return udf_add_nondir(dentry, inode);
646 }
647
648 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
649 {
650 struct inode *inode = udf_new_inode(dir, mode);
651
652 if (IS_ERR(inode))
653 return PTR_ERR(inode);
654
655 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
656 inode->i_data.a_ops = &udf_adinicb_aops;
657 else
658 inode->i_data.a_ops = &udf_aops;
659 inode->i_op = &udf_file_inode_operations;
660 inode->i_fop = &udf_file_operations;
661 mark_inode_dirty(inode);
662 d_tmpfile(dentry, inode);
663 unlock_new_inode(inode);
664 return 0;
665 }
666
667 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
668 dev_t rdev)
669 {
670 struct inode *inode;
671
672 if (!old_valid_dev(rdev))
673 return -EINVAL;
674
675 inode = udf_new_inode(dir, mode);
676 if (IS_ERR(inode))
677 return PTR_ERR(inode);
678
679 init_special_inode(inode, mode, rdev);
680 return udf_add_nondir(dentry, inode);
681 }
682
683 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
684 {
685 struct inode *inode;
686 struct udf_fileident_bh fibh;
687 struct fileIdentDesc cfi, *fi;
688 int err;
689 struct udf_inode_info *dinfo = UDF_I(dir);
690 struct udf_inode_info *iinfo;
691
692 inode = udf_new_inode(dir, S_IFDIR | mode);
693 if (IS_ERR(inode))
694 return PTR_ERR(inode);
695
696 iinfo = UDF_I(inode);
697 inode->i_op = &udf_dir_inode_operations;
698 inode->i_fop = &udf_dir_operations;
699 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
700 if (!fi) {
701 inode_dec_link_count(inode);
702 unlock_new_inode(inode);
703 iput(inode);
704 goto out;
705 }
706 set_nlink(inode, 2);
707 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
708 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
709 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
710 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
711 cfi.fileCharacteristics =
712 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
713 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
714 brelse(fibh.sbh);
715 mark_inode_dirty(inode);
716
717 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
718 if (!fi) {
719 clear_nlink(inode);
720 mark_inode_dirty(inode);
721 unlock_new_inode(inode);
722 iput(inode);
723 goto out;
724 }
725 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
726 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
727 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
728 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
729 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
730 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
731 inc_nlink(dir);
732 dir->i_ctime = dir->i_mtime = current_time(dir);
733 mark_inode_dirty(dir);
734 d_instantiate_new(dentry, inode);
735 if (fibh.sbh != fibh.ebh)
736 brelse(fibh.ebh);
737 brelse(fibh.sbh);
738 err = 0;
739
740 out:
741 return err;
742 }
743
744 static int empty_dir(struct inode *dir)
745 {
746 struct fileIdentDesc *fi, cfi;
747 struct udf_fileident_bh fibh;
748 loff_t f_pos;
749 loff_t size = udf_ext0_offset(dir) + dir->i_size;
750 int block;
751 struct kernel_lb_addr eloc;
752 uint32_t elen;
753 sector_t offset;
754 struct extent_position epos = {};
755 struct udf_inode_info *dinfo = UDF_I(dir);
756
757 f_pos = udf_ext0_offset(dir);
758 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
759
760 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
761 fibh.sbh = fibh.ebh = NULL;
762 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
763 &epos, &eloc, &elen, &offset) ==
764 (EXT_RECORDED_ALLOCATED >> 30)) {
765 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
766 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
767 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
768 epos.offset -= sizeof(struct short_ad);
769 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
770 epos.offset -= sizeof(struct long_ad);
771 } else
772 offset = 0;
773
774 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
775 if (!fibh.sbh) {
776 brelse(epos.bh);
777 return 0;
778 }
779 } else {
780 brelse(epos.bh);
781 return 0;
782 }
783
784 while (f_pos < size) {
785 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
786 &elen, &offset);
787 if (!fi) {
788 if (fibh.sbh != fibh.ebh)
789 brelse(fibh.ebh);
790 brelse(fibh.sbh);
791 brelse(epos.bh);
792 return 0;
793 }
794
795 if (cfi.lengthFileIdent &&
796 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
797 if (fibh.sbh != fibh.ebh)
798 brelse(fibh.ebh);
799 brelse(fibh.sbh);
800 brelse(epos.bh);
801 return 0;
802 }
803 }
804
805 if (fibh.sbh != fibh.ebh)
806 brelse(fibh.ebh);
807 brelse(fibh.sbh);
808 brelse(epos.bh);
809
810 return 1;
811 }
812
813 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
814 {
815 int retval;
816 struct inode *inode = d_inode(dentry);
817 struct udf_fileident_bh fibh;
818 struct fileIdentDesc *fi, cfi;
819 struct kernel_lb_addr tloc;
820
821 retval = -ENOENT;
822 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
823 if (IS_ERR_OR_NULL(fi)) {
824 if (fi)
825 retval = PTR_ERR(fi);
826 goto out;
827 }
828
829 retval = -EIO;
830 tloc = lelb_to_cpu(cfi.icb.extLocation);
831 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
832 goto end_rmdir;
833 retval = -ENOTEMPTY;
834 if (!empty_dir(inode))
835 goto end_rmdir;
836 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
837 if (retval)
838 goto end_rmdir;
839 if (inode->i_nlink != 2)
840 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
841 inode->i_nlink);
842 clear_nlink(inode);
843 inode->i_size = 0;
844 inode_dec_link_count(dir);
845 inode->i_ctime = dir->i_ctime = dir->i_mtime =
846 current_time(inode);
847 mark_inode_dirty(dir);
848
849 end_rmdir:
850 if (fibh.sbh != fibh.ebh)
851 brelse(fibh.ebh);
852 brelse(fibh.sbh);
853
854 out:
855 return retval;
856 }
857
858 static int udf_unlink(struct inode *dir, struct dentry *dentry)
859 {
860 int retval;
861 struct inode *inode = d_inode(dentry);
862 struct udf_fileident_bh fibh;
863 struct fileIdentDesc *fi;
864 struct fileIdentDesc cfi;
865 struct kernel_lb_addr tloc;
866
867 retval = -ENOENT;
868 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
869
870 if (IS_ERR_OR_NULL(fi)) {
871 if (fi)
872 retval = PTR_ERR(fi);
873 goto out;
874 }
875
876 retval = -EIO;
877 tloc = lelb_to_cpu(cfi.icb.extLocation);
878 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
879 goto end_unlink;
880
881 if (!inode->i_nlink) {
882 udf_debug("Deleting nonexistent file (%lu), %d\n",
883 inode->i_ino, inode->i_nlink);
884 set_nlink(inode, 1);
885 }
886 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
887 if (retval)
888 goto end_unlink;
889 dir->i_ctime = dir->i_mtime = current_time(dir);
890 mark_inode_dirty(dir);
891 inode_dec_link_count(inode);
892 inode->i_ctime = dir->i_ctime;
893 retval = 0;
894
895 end_unlink:
896 if (fibh.sbh != fibh.ebh)
897 brelse(fibh.ebh);
898 brelse(fibh.sbh);
899
900 out:
901 return retval;
902 }
903
904 static int udf_symlink(struct inode *dir, struct dentry *dentry,
905 const char *symname)
906 {
907 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
908 struct pathComponent *pc;
909 const char *compstart;
910 struct extent_position epos = {};
911 int eoffset, elen = 0;
912 uint8_t *ea;
913 int err;
914 int block;
915 unsigned char *name = NULL;
916 int namelen;
917 struct udf_inode_info *iinfo;
918 struct super_block *sb = dir->i_sb;
919
920 if (IS_ERR(inode))
921 return PTR_ERR(inode);
922
923 iinfo = UDF_I(inode);
924 down_write(&iinfo->i_data_sem);
925 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
926 if (!name) {
927 err = -ENOMEM;
928 goto out_no_entry;
929 }
930
931 inode->i_data.a_ops = &udf_symlink_aops;
932 inode->i_op = &udf_symlink_inode_operations;
933 inode_nohighmem(inode);
934
935 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
936 struct kernel_lb_addr eloc;
937 uint32_t bsize;
938
939 block = udf_new_block(sb, inode,
940 iinfo->i_location.partitionReferenceNum,
941 iinfo->i_location.logicalBlockNum, &err);
942 if (!block)
943 goto out_no_entry;
944 epos.block = iinfo->i_location;
945 epos.offset = udf_file_entry_alloc_offset(inode);
946 epos.bh = NULL;
947 eloc.logicalBlockNum = block;
948 eloc.partitionReferenceNum =
949 iinfo->i_location.partitionReferenceNum;
950 bsize = sb->s_blocksize;
951 iinfo->i_lenExtents = bsize;
952 udf_add_aext(inode, &epos, &eloc, bsize, 0);
953 brelse(epos.bh);
954
955 block = udf_get_pblock(sb, block,
956 iinfo->i_location.partitionReferenceNum,
957 0);
958 epos.bh = udf_tgetblk(sb, block);
959 lock_buffer(epos.bh);
960 memset(epos.bh->b_data, 0x00, bsize);
961 set_buffer_uptodate(epos.bh);
962 unlock_buffer(epos.bh);
963 mark_buffer_dirty_inode(epos.bh, inode);
964 ea = epos.bh->b_data + udf_ext0_offset(inode);
965 } else
966 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
967
968 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
969 pc = (struct pathComponent *)ea;
970
971 if (*symname == '/') {
972 do {
973 symname++;
974 } while (*symname == '/');
975
976 pc->componentType = 1;
977 pc->lengthComponentIdent = 0;
978 pc->componentFileVersionNum = 0;
979 elen += sizeof(struct pathComponent);
980 }
981
982 err = -ENAMETOOLONG;
983
984 while (*symname) {
985 if (elen + sizeof(struct pathComponent) > eoffset)
986 goto out_no_entry;
987
988 pc = (struct pathComponent *)(ea + elen);
989
990 compstart = symname;
991
992 do {
993 symname++;
994 } while (*symname && *symname != '/');
995
996 pc->componentType = 5;
997 pc->lengthComponentIdent = 0;
998 pc->componentFileVersionNum = 0;
999 if (compstart[0] == '.') {
1000 if ((symname - compstart) == 1)
1001 pc->componentType = 4;
1002 else if ((symname - compstart) == 2 &&
1003 compstart[1] == '.')
1004 pc->componentType = 3;
1005 }
1006
1007 if (pc->componentType == 5) {
1008 namelen = udf_put_filename(sb, compstart,
1009 symname - compstart,
1010 name, UDF_NAME_LEN_CS0);
1011 if (!namelen)
1012 goto out_no_entry;
1013
1014 if (elen + sizeof(struct pathComponent) + namelen >
1015 eoffset)
1016 goto out_no_entry;
1017 else
1018 pc->lengthComponentIdent = namelen;
1019
1020 memcpy(pc->componentIdent, name, namelen);
1021 }
1022
1023 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1024
1025 if (*symname) {
1026 do {
1027 symname++;
1028 } while (*symname == '/');
1029 }
1030 }
1031
1032 brelse(epos.bh);
1033 inode->i_size = elen;
1034 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1035 iinfo->i_lenAlloc = inode->i_size;
1036 else
1037 udf_truncate_tail_extent(inode);
1038 mark_inode_dirty(inode);
1039 up_write(&iinfo->i_data_sem);
1040
1041 err = udf_add_nondir(dentry, inode);
1042 out:
1043 kfree(name);
1044 return err;
1045
1046 out_no_entry:
1047 up_write(&iinfo->i_data_sem);
1048 inode_dec_link_count(inode);
1049 unlock_new_inode(inode);
1050 iput(inode);
1051 goto out;
1052 }
1053
1054 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1055 struct dentry *dentry)
1056 {
1057 struct inode *inode = d_inode(old_dentry);
1058 struct udf_fileident_bh fibh;
1059 struct fileIdentDesc cfi, *fi;
1060 int err;
1061
1062 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1063 if (!fi) {
1064 return err;
1065 }
1066 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1067 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1068 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1069 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1070 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1071 }
1072 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1073 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1074 mark_inode_dirty(dir);
1075
1076 if (fibh.sbh != fibh.ebh)
1077 brelse(fibh.ebh);
1078 brelse(fibh.sbh);
1079 inc_nlink(inode);
1080 inode->i_ctime = current_time(inode);
1081 mark_inode_dirty(inode);
1082 dir->i_ctime = dir->i_mtime = current_time(dir);
1083 mark_inode_dirty(dir);
1084 ihold(inode);
1085 d_instantiate(dentry, inode);
1086
1087 return 0;
1088 }
1089
1090 /* Anybody can rename anything with this: the permission checks are left to the
1091 * higher-level routines.
1092 */
1093 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1094 struct inode *new_dir, struct dentry *new_dentry,
1095 unsigned int flags)
1096 {
1097 struct inode *old_inode = d_inode(old_dentry);
1098 struct inode *new_inode = d_inode(new_dentry);
1099 struct udf_fileident_bh ofibh, nfibh;
1100 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1101 struct fileIdentDesc ocfi, ncfi;
1102 struct buffer_head *dir_bh = NULL;
1103 int retval = -ENOENT;
1104 struct kernel_lb_addr tloc;
1105 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1106
1107 if (flags & ~RENAME_NOREPLACE)
1108 return -EINVAL;
1109
1110 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1111 if (IS_ERR(ofi)) {
1112 retval = PTR_ERR(ofi);
1113 goto end_rename;
1114 }
1115
1116 if (ofibh.sbh != ofibh.ebh)
1117 brelse(ofibh.ebh);
1118
1119 brelse(ofibh.sbh);
1120 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1121 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1122 != old_inode->i_ino)
1123 goto end_rename;
1124
1125 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1126 if (IS_ERR(nfi)) {
1127 retval = PTR_ERR(nfi);
1128 goto end_rename;
1129 }
1130 if (nfi && !new_inode) {
1131 if (nfibh.sbh != nfibh.ebh)
1132 brelse(nfibh.ebh);
1133 brelse(nfibh.sbh);
1134 nfi = NULL;
1135 }
1136 if (S_ISDIR(old_inode->i_mode)) {
1137 int offset = udf_ext0_offset(old_inode);
1138
1139 if (new_inode) {
1140 retval = -ENOTEMPTY;
1141 if (!empty_dir(new_inode))
1142 goto end_rename;
1143 }
1144 retval = -EIO;
1145 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1146 dir_fi = udf_get_fileident(
1147 old_iinfo->i_ext.i_data -
1148 (old_iinfo->i_efe ?
1149 sizeof(struct extendedFileEntry) :
1150 sizeof(struct fileEntry)),
1151 old_inode->i_sb->s_blocksize, &offset);
1152 } else {
1153 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1154 if (!dir_bh)
1155 goto end_rename;
1156 dir_fi = udf_get_fileident(dir_bh->b_data,
1157 old_inode->i_sb->s_blocksize, &offset);
1158 }
1159 if (!dir_fi)
1160 goto end_rename;
1161 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1162 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1163 old_dir->i_ino)
1164 goto end_rename;
1165 }
1166 if (!nfi) {
1167 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1168 &retval);
1169 if (!nfi)
1170 goto end_rename;
1171 }
1172
1173 /*
1174 * Like most other Unix systems, set the ctime for inodes on a
1175 * rename.
1176 */
1177 old_inode->i_ctime = current_time(old_inode);
1178 mark_inode_dirty(old_inode);
1179
1180 /*
1181 * ok, that's it
1182 */
1183 ncfi.fileVersionNum = ocfi.fileVersionNum;
1184 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1185 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1186 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1187
1188 /* The old fid may have moved - find it again */
1189 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1190 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1191
1192 if (new_inode) {
1193 new_inode->i_ctime = current_time(new_inode);
1194 inode_dec_link_count(new_inode);
1195 }
1196 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1197 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1198 mark_inode_dirty(old_dir);
1199 mark_inode_dirty(new_dir);
1200
1201 if (dir_fi) {
1202 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1203 udf_update_tag((char *)dir_fi,
1204 (sizeof(struct fileIdentDesc) +
1205 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1206 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1207 mark_inode_dirty(old_inode);
1208 else
1209 mark_buffer_dirty_inode(dir_bh, old_inode);
1210
1211 inode_dec_link_count(old_dir);
1212 if (new_inode)
1213 inode_dec_link_count(new_inode);
1214 else {
1215 inc_nlink(new_dir);
1216 mark_inode_dirty(new_dir);
1217 }
1218 }
1219
1220 if (ofi) {
1221 if (ofibh.sbh != ofibh.ebh)
1222 brelse(ofibh.ebh);
1223 brelse(ofibh.sbh);
1224 }
1225
1226 retval = 0;
1227
1228 end_rename:
1229 brelse(dir_bh);
1230 if (nfi) {
1231 if (nfibh.sbh != nfibh.ebh)
1232 brelse(nfibh.ebh);
1233 brelse(nfibh.sbh);
1234 }
1235
1236 return retval;
1237 }
1238
1239 static struct dentry *udf_get_parent(struct dentry *child)
1240 {
1241 struct kernel_lb_addr tloc;
1242 struct inode *inode = NULL;
1243 struct qstr dotdot = QSTR_INIT("..", 2);
1244 struct fileIdentDesc cfi;
1245 struct udf_fileident_bh fibh;
1246
1247 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1248 return ERR_PTR(-EACCES);
1249
1250 if (fibh.sbh != fibh.ebh)
1251 brelse(fibh.ebh);
1252 brelse(fibh.sbh);
1253
1254 tloc = lelb_to_cpu(cfi.icb.extLocation);
1255 inode = udf_iget(child->d_sb, &tloc);
1256 if (IS_ERR(inode))
1257 return ERR_CAST(inode);
1258
1259 return d_obtain_alias(inode);
1260 }
1261
1262
1263 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1264 u16 partref, __u32 generation)
1265 {
1266 struct inode *inode;
1267 struct kernel_lb_addr loc;
1268
1269 if (block == 0)
1270 return ERR_PTR(-ESTALE);
1271
1272 loc.logicalBlockNum = block;
1273 loc.partitionReferenceNum = partref;
1274 inode = udf_iget(sb, &loc);
1275
1276 if (IS_ERR(inode))
1277 return ERR_CAST(inode);
1278
1279 if (generation && inode->i_generation != generation) {
1280 iput(inode);
1281 return ERR_PTR(-ESTALE);
1282 }
1283 return d_obtain_alias(inode);
1284 }
1285
1286 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1287 struct fid *fid, int fh_len, int fh_type)
1288 {
1289 if (fh_len < 3 ||
1290 (fh_type != FILEID_UDF_WITH_PARENT &&
1291 fh_type != FILEID_UDF_WITHOUT_PARENT))
1292 return NULL;
1293
1294 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1295 fid->udf.generation);
1296 }
1297
1298 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1299 struct fid *fid, int fh_len, int fh_type)
1300 {
1301 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1302 return NULL;
1303
1304 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1305 fid->udf.parent_partref,
1306 fid->udf.parent_generation);
1307 }
1308 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1309 struct inode *parent)
1310 {
1311 int len = *lenp;
1312 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1313 struct fid *fid = (struct fid *)fh;
1314 int type = FILEID_UDF_WITHOUT_PARENT;
1315
1316 if (parent && (len < 5)) {
1317 *lenp = 5;
1318 return FILEID_INVALID;
1319 } else if (len < 3) {
1320 *lenp = 3;
1321 return FILEID_INVALID;
1322 }
1323
1324 *lenp = 3;
1325 fid->udf.block = location.logicalBlockNum;
1326 fid->udf.partref = location.partitionReferenceNum;
1327 fid->udf.parent_partref = 0;
1328 fid->udf.generation = inode->i_generation;
1329
1330 if (parent) {
1331 location = UDF_I(parent)->i_location;
1332 fid->udf.parent_block = location.logicalBlockNum;
1333 fid->udf.parent_partref = location.partitionReferenceNum;
1334 fid->udf.parent_generation = inode->i_generation;
1335 *lenp = 5;
1336 type = FILEID_UDF_WITH_PARENT;
1337 }
1338
1339 return type;
1340 }
1341
1342 const struct export_operations udf_export_ops = {
1343 .encode_fh = udf_encode_fh,
1344 .fh_to_dentry = udf_fh_to_dentry,
1345 .fh_to_parent = udf_fh_to_parent,
1346 .get_parent = udf_get_parent,
1347 };
1348
1349 const struct inode_operations udf_dir_inode_operations = {
1350 .lookup = udf_lookup,
1351 .create = udf_create,
1352 .link = udf_link,
1353 .unlink = udf_unlink,
1354 .symlink = udf_symlink,
1355 .mkdir = udf_mkdir,
1356 .rmdir = udf_rmdir,
1357 .mknod = udf_mknod,
1358 .rename = udf_rename,
1359 .tmpfile = udf_tmpfile,
1360 };
Linux with added FPC-III support