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
udf_match(int len1,const unsigned char * name1,int len2,const unsigned char * name2)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
udf_write_fi(struct inode * inode,struct fileIdentDesc * cfi,struct fileIdentDesc * sfi,struct udf_fileident_bh * fibh,uint8_t * impuse,uint8_t * fileident)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 */
udf_find_entry(struct inode * dir,const struct qstr * child,struct udf_fileident_bh * fibh,struct fileIdentDesc * cfi)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 udf_pblk_t block;
168 int flen;
169 unsigned char *fname = NULL, *copy_name = NULL;
170 unsigned char *nameptr;
171 uint8_t lfi;
172 uint16_t liu;
173 loff_t size;
174 struct kernel_lb_addr eloc;
175 uint32_t elen;
176 sector_t offset;
177 struct extent_position epos = {};
178 struct udf_inode_info *dinfo = UDF_I(dir);
179 int isdotdot = child->len == 2 &&
180 child->name[0] == '.' && child->name[1] == '.';
181 struct super_block *sb = dir->i_sb;
182
183 size = udf_ext0_offset(dir) + dir->i_size;
184 f_pos = udf_ext0_offset(dir);
185
186 fibh->sbh = fibh->ebh = NULL;
187 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
188 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
189 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
190 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
191 fi = ERR_PTR(-EIO);
192 goto out_err;
193 }
194
195 block = udf_get_lb_pblock(sb, &eloc, offset);
196 if ((++offset << sb->s_blocksize_bits) < elen) {
197 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
198 epos.offset -= sizeof(struct short_ad);
199 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
200 epos.offset -= sizeof(struct long_ad);
201 } else
202 offset = 0;
203
204 fibh->sbh = fibh->ebh = udf_tread(sb, block);
205 if (!fibh->sbh) {
206 fi = ERR_PTR(-EIO);
207 goto out_err;
208 }
209 }
210
211 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
212 if (!fname) {
213 fi = ERR_PTR(-ENOMEM);
214 goto out_err;
215 }
216
217 while (f_pos < size) {
218 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
219 &elen, &offset);
220 if (!fi) {
221 fi = ERR_PTR(-EIO);
222 goto out_err;
223 }
224
225 liu = le16_to_cpu(cfi->lengthOfImpUse);
226 lfi = cfi->lengthFileIdent;
227
228 if (fibh->sbh == fibh->ebh) {
229 nameptr = fi->fileIdent + liu;
230 } else {
231 int poffset; /* Unpaded ending offset */
232
233 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
234 liu + lfi;
235
236 if (poffset >= lfi)
237 nameptr = (uint8_t *)(fibh->ebh->b_data +
238 poffset - lfi);
239 else {
240 if (!copy_name) {
241 copy_name = kmalloc(UDF_NAME_LEN,
242 GFP_NOFS);
243 if (!copy_name) {
244 fi = ERR_PTR(-ENOMEM);
245 goto out_err;
246 }
247 }
248 nameptr = copy_name;
249 memcpy(nameptr, fi->fileIdent + liu,
250 lfi - poffset);
251 memcpy(nameptr + lfi - poffset,
252 fibh->ebh->b_data, poffset);
253 }
254 }
255
256 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
257 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
258 continue;
259 }
260
261 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
262 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263 continue;
264 }
265
266 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
267 isdotdot)
268 goto out_ok;
269
270 if (!lfi)
271 continue;
272
273 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
274 if (flen < 0) {
275 fi = ERR_PTR(flen);
276 goto out_err;
277 }
278
279 if (udf_match(flen, fname, child->len, child->name))
280 goto out_ok;
281 }
282
283 fi = NULL;
284 out_err:
285 if (fibh->sbh != fibh->ebh)
286 brelse(fibh->ebh);
287 brelse(fibh->sbh);
288 out_ok:
289 brelse(epos.bh);
290 kfree(fname);
291 kfree(copy_name);
292
293 return fi;
294 }
295
udf_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
297 unsigned int flags)
298 {
299 struct inode *inode = NULL;
300 struct fileIdentDesc cfi;
301 struct udf_fileident_bh fibh;
302 struct fileIdentDesc *fi;
303
304 if (dentry->d_name.len > UDF_NAME_LEN)
305 return ERR_PTR(-ENAMETOOLONG);
306
307 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
308 if (IS_ERR(fi))
309 return ERR_CAST(fi);
310
311 if (fi) {
312 struct kernel_lb_addr loc;
313
314 if (fibh.sbh != fibh.ebh)
315 brelse(fibh.ebh);
316 brelse(fibh.sbh);
317
318 loc = lelb_to_cpu(cfi.icb.extLocation);
319 inode = udf_iget(dir->i_sb, &loc);
320 if (IS_ERR(inode))
321 return ERR_CAST(inode);
322 }
323
324 return d_splice_alias(inode, dentry);
325 }
326
udf_add_entry(struct inode * dir,struct dentry * dentry,struct udf_fileident_bh * fibh,struct fileIdentDesc * cfi,int * err)327 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
328 struct dentry *dentry,
329 struct udf_fileident_bh *fibh,
330 struct fileIdentDesc *cfi, int *err)
331 {
332 struct super_block *sb = dir->i_sb;
333 struct fileIdentDesc *fi = NULL;
334 unsigned char *name = NULL;
335 int namelen;
336 loff_t f_pos;
337 loff_t size = udf_ext0_offset(dir) + dir->i_size;
338 int nfidlen;
339 udf_pblk_t block;
340 struct kernel_lb_addr eloc;
341 uint32_t elen = 0;
342 sector_t offset;
343 struct extent_position epos = {};
344 struct udf_inode_info *dinfo;
345
346 fibh->sbh = fibh->ebh = NULL;
347 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
348 if (!name) {
349 *err = -ENOMEM;
350 goto out_err;
351 }
352
353 if (dentry) {
354 if (!dentry->d_name.len) {
355 *err = -EINVAL;
356 goto out_err;
357 }
358 namelen = udf_put_filename(sb, dentry->d_name.name,
359 dentry->d_name.len,
360 name, UDF_NAME_LEN_CS0);
361 if (!namelen) {
362 *err = -ENAMETOOLONG;
363 goto out_err;
364 }
365 } else {
366 namelen = 0;
367 }
368
369 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
370
371 f_pos = udf_ext0_offset(dir);
372
373 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
374 dinfo = UDF_I(dir);
375 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
376 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
377 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
378 block = udf_get_lb_pblock(dir->i_sb,
379 &dinfo->i_location, 0);
380 fibh->soffset = fibh->eoffset = sb->s_blocksize;
381 goto add;
382 }
383 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
384 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
385 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
386 epos.offset -= sizeof(struct short_ad);
387 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
388 epos.offset -= sizeof(struct long_ad);
389 } else
390 offset = 0;
391
392 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
393 if (!fibh->sbh) {
394 *err = -EIO;
395 goto out_err;
396 }
397
398 block = dinfo->i_location.logicalBlockNum;
399 }
400
401 while (f_pos < size) {
402 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
403 &elen, &offset);
404
405 if (!fi) {
406 *err = -EIO;
407 goto out_err;
408 }
409
410 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
411 if (udf_dir_entry_len(cfi) == nfidlen) {
412 cfi->descTag.tagSerialNum = cpu_to_le16(1);
413 cfi->fileVersionNum = cpu_to_le16(1);
414 cfi->fileCharacteristics = 0;
415 cfi->lengthFileIdent = namelen;
416 cfi->lengthOfImpUse = cpu_to_le16(0);
417 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
418 name))
419 goto out_ok;
420 else {
421 *err = -EIO;
422 goto out_err;
423 }
424 }
425 }
426 }
427
428 add:
429 f_pos += nfidlen;
430
431 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
432 sb->s_blocksize - fibh->eoffset < nfidlen) {
433 brelse(epos.bh);
434 epos.bh = NULL;
435 fibh->soffset -= udf_ext0_offset(dir);
436 fibh->eoffset -= udf_ext0_offset(dir);
437 f_pos -= udf_ext0_offset(dir);
438 if (fibh->sbh != fibh->ebh)
439 brelse(fibh->ebh);
440 brelse(fibh->sbh);
441 fibh->sbh = fibh->ebh =
442 udf_expand_dir_adinicb(dir, &block, err);
443 if (!fibh->sbh)
444 goto out_err;
445 epos.block = dinfo->i_location;
446 epos.offset = udf_file_entry_alloc_offset(dir);
447 /* Load extent udf_expand_dir_adinicb() has created */
448 udf_current_aext(dir, &epos, &eloc, &elen, 1);
449 }
450
451 /* Entry fits into current block? */
452 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
453 fibh->soffset = fibh->eoffset;
454 fibh->eoffset += nfidlen;
455 if (fibh->sbh != fibh->ebh) {
456 brelse(fibh->sbh);
457 fibh->sbh = fibh->ebh;
458 }
459
460 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
461 block = dinfo->i_location.logicalBlockNum;
462 fi = (struct fileIdentDesc *)
463 (dinfo->i_data + fibh->soffset -
464 udf_ext0_offset(dir) +
465 dinfo->i_lenEAttr);
466 } else {
467 block = eloc.logicalBlockNum +
468 ((elen - 1) >>
469 dir->i_sb->s_blocksize_bits);
470 fi = (struct fileIdentDesc *)
471 (fibh->sbh->b_data + fibh->soffset);
472 }
473 } else {
474 /* Round up last extent in the file */
475 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
476 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
477 epos.offset -= sizeof(struct short_ad);
478 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
479 epos.offset -= sizeof(struct long_ad);
480 udf_write_aext(dir, &epos, &eloc, elen, 1);
481 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
482 - 1) & ~(sb->s_blocksize - 1);
483
484 fibh->soffset = fibh->eoffset - sb->s_blocksize;
485 fibh->eoffset += nfidlen - sb->s_blocksize;
486 if (fibh->sbh != fibh->ebh) {
487 brelse(fibh->sbh);
488 fibh->sbh = fibh->ebh;
489 }
490
491 block = eloc.logicalBlockNum + ((elen - 1) >>
492 dir->i_sb->s_blocksize_bits);
493 fibh->ebh = udf_bread(dir,
494 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
495 if (!fibh->ebh)
496 goto out_err;
497 /* Extents could have been merged, invalidate our position */
498 brelse(epos.bh);
499 epos.bh = NULL;
500 epos.block = dinfo->i_location;
501 epos.offset = udf_file_entry_alloc_offset(dir);
502
503 if (!fibh->soffset) {
504 /* Find the freshly allocated block */
505 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
506 (EXT_RECORDED_ALLOCATED >> 30))
507 ;
508 block = eloc.logicalBlockNum + ((elen - 1) >>
509 dir->i_sb->s_blocksize_bits);
510 brelse(fibh->sbh);
511 fibh->sbh = fibh->ebh;
512 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
513 } else {
514 fi = (struct fileIdentDesc *)
515 (fibh->sbh->b_data + sb->s_blocksize +
516 fibh->soffset);
517 }
518 }
519
520 memset(cfi, 0, sizeof(struct fileIdentDesc));
521 if (UDF_SB(sb)->s_udfrev >= 0x0200)
522 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
523 sizeof(struct tag));
524 else
525 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
526 sizeof(struct tag));
527 cfi->fileVersionNum = cpu_to_le16(1);
528 cfi->lengthFileIdent = namelen;
529 cfi->lengthOfImpUse = cpu_to_le16(0);
530 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
531 dir->i_size += nfidlen;
532 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
533 dinfo->i_lenAlloc += nfidlen;
534 else {
535 /* Find the last extent and truncate it to proper size */
536 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
537 (EXT_RECORDED_ALLOCATED >> 30))
538 ;
539 elen -= dinfo->i_lenExtents - dir->i_size;
540 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
541 epos.offset -= sizeof(struct short_ad);
542 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
543 epos.offset -= sizeof(struct long_ad);
544 udf_write_aext(dir, &epos, &eloc, elen, 1);
545 dinfo->i_lenExtents = dir->i_size;
546 }
547
548 mark_inode_dirty(dir);
549 goto out_ok;
550 } else {
551 *err = -EIO;
552 goto out_err;
553 }
554
555 out_err:
556 fi = NULL;
557 if (fibh->sbh != fibh->ebh)
558 brelse(fibh->ebh);
559 brelse(fibh->sbh);
560 out_ok:
561 brelse(epos.bh);
562 kfree(name);
563 return fi;
564 }
565
udf_delete_entry(struct inode * inode,struct fileIdentDesc * fi,struct udf_fileident_bh * fibh,struct fileIdentDesc * cfi)566 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
567 struct udf_fileident_bh *fibh,
568 struct fileIdentDesc *cfi)
569 {
570 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
571
572 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
573 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
574
575 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
576 }
577
udf_add_nondir(struct dentry * dentry,struct inode * inode)578 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
579 {
580 struct udf_inode_info *iinfo = UDF_I(inode);
581 struct inode *dir = d_inode(dentry->d_parent);
582 struct udf_fileident_bh fibh;
583 struct fileIdentDesc cfi, *fi;
584 int err;
585
586 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
587 if (unlikely(!fi)) {
588 inode_dec_link_count(inode);
589 discard_new_inode(inode);
590 return err;
591 }
592 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
593 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
594 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
595 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
596 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
597 dir->i_ctime = dir->i_mtime = current_time(dir);
598 mark_inode_dirty(dir);
599 if (fibh.sbh != fibh.ebh)
600 brelse(fibh.ebh);
601 brelse(fibh.sbh);
602 d_instantiate_new(dentry, inode);
603
604 return 0;
605 }
606
udf_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)607 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
608 bool excl)
609 {
610 struct inode *inode = udf_new_inode(dir, mode);
611
612 if (IS_ERR(inode))
613 return PTR_ERR(inode);
614
615 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
616 inode->i_data.a_ops = &udf_adinicb_aops;
617 else
618 inode->i_data.a_ops = &udf_aops;
619 inode->i_op = &udf_file_inode_operations;
620 inode->i_fop = &udf_file_operations;
621 mark_inode_dirty(inode);
622
623 return udf_add_nondir(dentry, inode);
624 }
625
udf_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode)626 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
627 {
628 struct inode *inode = udf_new_inode(dir, mode);
629
630 if (IS_ERR(inode))
631 return PTR_ERR(inode);
632
633 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
634 inode->i_data.a_ops = &udf_adinicb_aops;
635 else
636 inode->i_data.a_ops = &udf_aops;
637 inode->i_op = &udf_file_inode_operations;
638 inode->i_fop = &udf_file_operations;
639 mark_inode_dirty(inode);
640 d_tmpfile(dentry, inode);
641 unlock_new_inode(inode);
642 return 0;
643 }
644
udf_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)645 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
646 dev_t rdev)
647 {
648 struct inode *inode;
649
650 if (!old_valid_dev(rdev))
651 return -EINVAL;
652
653 inode = udf_new_inode(dir, mode);
654 if (IS_ERR(inode))
655 return PTR_ERR(inode);
656
657 init_special_inode(inode, mode, rdev);
658 return udf_add_nondir(dentry, inode);
659 }
660
udf_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)661 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
662 {
663 struct inode *inode;
664 struct udf_fileident_bh fibh;
665 struct fileIdentDesc cfi, *fi;
666 int err;
667 struct udf_inode_info *dinfo = UDF_I(dir);
668 struct udf_inode_info *iinfo;
669
670 inode = udf_new_inode(dir, S_IFDIR | mode);
671 if (IS_ERR(inode))
672 return PTR_ERR(inode);
673
674 iinfo = UDF_I(inode);
675 inode->i_op = &udf_dir_inode_operations;
676 inode->i_fop = &udf_dir_operations;
677 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
678 if (!fi) {
679 inode_dec_link_count(inode);
680 discard_new_inode(inode);
681 goto out;
682 }
683 set_nlink(inode, 2);
684 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
685 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
686 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
687 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
688 cfi.fileCharacteristics =
689 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
690 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
691 brelse(fibh.sbh);
692 mark_inode_dirty(inode);
693
694 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
695 if (!fi) {
696 clear_nlink(inode);
697 mark_inode_dirty(inode);
698 discard_new_inode(inode);
699 goto out;
700 }
701 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
702 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
703 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
704 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
705 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
706 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
707 inc_nlink(dir);
708 dir->i_ctime = dir->i_mtime = current_time(dir);
709 mark_inode_dirty(dir);
710 d_instantiate_new(dentry, inode);
711 if (fibh.sbh != fibh.ebh)
712 brelse(fibh.ebh);
713 brelse(fibh.sbh);
714 err = 0;
715
716 out:
717 return err;
718 }
719
empty_dir(struct inode * dir)720 static int empty_dir(struct inode *dir)
721 {
722 struct fileIdentDesc *fi, cfi;
723 struct udf_fileident_bh fibh;
724 loff_t f_pos;
725 loff_t size = udf_ext0_offset(dir) + dir->i_size;
726 udf_pblk_t block;
727 struct kernel_lb_addr eloc;
728 uint32_t elen;
729 sector_t offset;
730 struct extent_position epos = {};
731 struct udf_inode_info *dinfo = UDF_I(dir);
732
733 f_pos = udf_ext0_offset(dir);
734 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
735
736 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
737 fibh.sbh = fibh.ebh = NULL;
738 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
739 &epos, &eloc, &elen, &offset) ==
740 (EXT_RECORDED_ALLOCATED >> 30)) {
741 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
742 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
743 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
744 epos.offset -= sizeof(struct short_ad);
745 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
746 epos.offset -= sizeof(struct long_ad);
747 } else
748 offset = 0;
749
750 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
751 if (!fibh.sbh) {
752 brelse(epos.bh);
753 return 0;
754 }
755 } else {
756 brelse(epos.bh);
757 return 0;
758 }
759
760 while (f_pos < size) {
761 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
762 &elen, &offset);
763 if (!fi) {
764 if (fibh.sbh != fibh.ebh)
765 brelse(fibh.ebh);
766 brelse(fibh.sbh);
767 brelse(epos.bh);
768 return 0;
769 }
770
771 if (cfi.lengthFileIdent &&
772 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
773 if (fibh.sbh != fibh.ebh)
774 brelse(fibh.ebh);
775 brelse(fibh.sbh);
776 brelse(epos.bh);
777 return 0;
778 }
779 }
780
781 if (fibh.sbh != fibh.ebh)
782 brelse(fibh.ebh);
783 brelse(fibh.sbh);
784 brelse(epos.bh);
785
786 return 1;
787 }
788
udf_rmdir(struct inode * dir,struct dentry * dentry)789 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
790 {
791 int retval;
792 struct inode *inode = d_inode(dentry);
793 struct udf_fileident_bh fibh;
794 struct fileIdentDesc *fi, cfi;
795 struct kernel_lb_addr tloc;
796
797 retval = -ENOENT;
798 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
799 if (IS_ERR_OR_NULL(fi)) {
800 if (fi)
801 retval = PTR_ERR(fi);
802 goto out;
803 }
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 (%u)\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_time(inode);
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
udf_unlink(struct inode * dir,struct dentry * dentry)834 static int udf_unlink(struct inode *dir, struct dentry *dentry)
835 {
836 int retval;
837 struct inode *inode = d_inode(dentry);
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
846 if (IS_ERR_OR_NULL(fi)) {
847 if (fi)
848 retval = PTR_ERR(fi);
849 goto out;
850 }
851
852 retval = -EIO;
853 tloc = lelb_to_cpu(cfi.icb.extLocation);
854 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
855 goto end_unlink;
856
857 if (!inode->i_nlink) {
858 udf_debug("Deleting nonexistent file (%lu), %u\n",
859 inode->i_ino, inode->i_nlink);
860 set_nlink(inode, 1);
861 }
862 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
863 if (retval)
864 goto end_unlink;
865 dir->i_ctime = dir->i_mtime = current_time(dir);
866 mark_inode_dirty(dir);
867 inode_dec_link_count(inode);
868 inode->i_ctime = dir->i_ctime;
869 retval = 0;
870
871 end_unlink:
872 if (fibh.sbh != fibh.ebh)
873 brelse(fibh.ebh);
874 brelse(fibh.sbh);
875
876 out:
877 return retval;
878 }
879
udf_symlink(struct inode * dir,struct dentry * dentry,const char * symname)880 static int udf_symlink(struct inode *dir, struct dentry *dentry,
881 const char *symname)
882 {
883 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
884 struct pathComponent *pc;
885 const char *compstart;
886 struct extent_position epos = {};
887 int eoffset, elen = 0;
888 uint8_t *ea;
889 int err;
890 udf_pblk_t block;
891 unsigned char *name = NULL;
892 int namelen;
893 struct udf_inode_info *iinfo;
894 struct super_block *sb = dir->i_sb;
895
896 if (IS_ERR(inode))
897 return PTR_ERR(inode);
898
899 iinfo = UDF_I(inode);
900 down_write(&iinfo->i_data_sem);
901 name = kmalloc(UDF_NAME_LEN_CS0, 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 inode_nohighmem(inode);
910
911 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
912 struct kernel_lb_addr eloc;
913 uint32_t bsize;
914
915 block = udf_new_block(sb, inode,
916 iinfo->i_location.partitionReferenceNum,
917 iinfo->i_location.logicalBlockNum, &err);
918 if (!block)
919 goto out_no_entry;
920 epos.block = iinfo->i_location;
921 epos.offset = udf_file_entry_alloc_offset(inode);
922 epos.bh = NULL;
923 eloc.logicalBlockNum = block;
924 eloc.partitionReferenceNum =
925 iinfo->i_location.partitionReferenceNum;
926 bsize = sb->s_blocksize;
927 iinfo->i_lenExtents = bsize;
928 udf_add_aext(inode, &epos, &eloc, bsize, 0);
929 brelse(epos.bh);
930
931 block = udf_get_pblock(sb, block,
932 iinfo->i_location.partitionReferenceNum,
933 0);
934 epos.bh = udf_tgetblk(sb, block);
935 lock_buffer(epos.bh);
936 memset(epos.bh->b_data, 0x00, bsize);
937 set_buffer_uptodate(epos.bh);
938 unlock_buffer(epos.bh);
939 mark_buffer_dirty_inode(epos.bh, inode);
940 ea = epos.bh->b_data + udf_ext0_offset(inode);
941 } else
942 ea = iinfo->i_data + iinfo->i_lenEAttr;
943
944 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
945 pc = (struct pathComponent *)ea;
946
947 if (*symname == '/') {
948 do {
949 symname++;
950 } while (*symname == '/');
951
952 pc->componentType = 1;
953 pc->lengthComponentIdent = 0;
954 pc->componentFileVersionNum = 0;
955 elen += sizeof(struct pathComponent);
956 }
957
958 err = -ENAMETOOLONG;
959
960 while (*symname) {
961 if (elen + sizeof(struct pathComponent) > eoffset)
962 goto out_no_entry;
963
964 pc = (struct pathComponent *)(ea + elen);
965
966 compstart = symname;
967
968 do {
969 symname++;
970 } while (*symname && *symname != '/');
971
972 pc->componentType = 5;
973 pc->lengthComponentIdent = 0;
974 pc->componentFileVersionNum = 0;
975 if (compstart[0] == '.') {
976 if ((symname - compstart) == 1)
977 pc->componentType = 4;
978 else if ((symname - compstart) == 2 &&
979 compstart[1] == '.')
980 pc->componentType = 3;
981 }
982
983 if (pc->componentType == 5) {
984 namelen = udf_put_filename(sb, compstart,
985 symname - compstart,
986 name, UDF_NAME_LEN_CS0);
987 if (!namelen)
988 goto out_no_entry;
989
990 if (elen + sizeof(struct pathComponent) + namelen >
991 eoffset)
992 goto out_no_entry;
993 else
994 pc->lengthComponentIdent = namelen;
995
996 memcpy(pc->componentIdent, name, namelen);
997 }
998
999 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1000
1001 if (*symname) {
1002 do {
1003 symname++;
1004 } while (*symname == '/');
1005 }
1006 }
1007
1008 brelse(epos.bh);
1009 inode->i_size = elen;
1010 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1011 iinfo->i_lenAlloc = inode->i_size;
1012 else
1013 udf_truncate_tail_extent(inode);
1014 mark_inode_dirty(inode);
1015 up_write(&iinfo->i_data_sem);
1016
1017 err = udf_add_nondir(dentry, inode);
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 discard_new_inode(inode);
1026 goto out;
1027 }
1028
udf_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)1029 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1030 struct dentry *dentry)
1031 {
1032 struct inode *inode = d_inode(old_dentry);
1033 struct udf_fileident_bh fibh;
1034 struct fileIdentDesc cfi, *fi;
1035 int err;
1036
1037 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1038 if (!fi) {
1039 return err;
1040 }
1041 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1042 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1043 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1044 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1045 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1046 }
1047 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1048 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1049 mark_inode_dirty(dir);
1050
1051 if (fibh.sbh != fibh.ebh)
1052 brelse(fibh.ebh);
1053 brelse(fibh.sbh);
1054 inc_nlink(inode);
1055 inode->i_ctime = current_time(inode);
1056 mark_inode_dirty(inode);
1057 dir->i_ctime = dir->i_mtime = current_time(dir);
1058 mark_inode_dirty(dir);
1059 ihold(inode);
1060 d_instantiate(dentry, inode);
1061
1062 return 0;
1063 }
1064
1065 /* Anybody can rename anything with this: the permission checks are left to the
1066 * higher-level routines.
1067 */
udf_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1068 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1069 struct inode *new_dir, struct dentry *new_dentry,
1070 unsigned int flags)
1071 {
1072 struct inode *old_inode = d_inode(old_dentry);
1073 struct inode *new_inode = d_inode(new_dentry);
1074 struct udf_fileident_bh ofibh, nfibh;
1075 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1076 struct fileIdentDesc ocfi, ncfi;
1077 struct buffer_head *dir_bh = NULL;
1078 int retval = -ENOENT;
1079 struct kernel_lb_addr tloc;
1080 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1081
1082 if (flags & ~RENAME_NOREPLACE)
1083 return -EINVAL;
1084
1085 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1086 if (IS_ERR(ofi)) {
1087 retval = PTR_ERR(ofi);
1088 goto end_rename;
1089 }
1090
1091 if (ofibh.sbh != ofibh.ebh)
1092 brelse(ofibh.ebh);
1093
1094 brelse(ofibh.sbh);
1095 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1096 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1097 != old_inode->i_ino)
1098 goto end_rename;
1099
1100 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1101 if (IS_ERR(nfi)) {
1102 retval = PTR_ERR(nfi);
1103 goto end_rename;
1104 }
1105 if (nfi && !new_inode) {
1106 if (nfibh.sbh != nfibh.ebh)
1107 brelse(nfibh.ebh);
1108 brelse(nfibh.sbh);
1109 nfi = NULL;
1110 }
1111 if (S_ISDIR(old_inode->i_mode)) {
1112 int offset = udf_ext0_offset(old_inode);
1113
1114 if (new_inode) {
1115 retval = -ENOTEMPTY;
1116 if (!empty_dir(new_inode))
1117 goto end_rename;
1118 }
1119 retval = -EIO;
1120 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1121 dir_fi = udf_get_fileident(
1122 old_iinfo->i_data -
1123 (old_iinfo->i_efe ?
1124 sizeof(struct extendedFileEntry) :
1125 sizeof(struct fileEntry)),
1126 old_inode->i_sb->s_blocksize, &offset);
1127 } else {
1128 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1129 if (!dir_bh)
1130 goto end_rename;
1131 dir_fi = udf_get_fileident(dir_bh->b_data,
1132 old_inode->i_sb->s_blocksize, &offset);
1133 }
1134 if (!dir_fi)
1135 goto end_rename;
1136 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1137 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1138 old_dir->i_ino)
1139 goto end_rename;
1140 }
1141 if (!nfi) {
1142 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1143 &retval);
1144 if (!nfi)
1145 goto end_rename;
1146 }
1147
1148 /*
1149 * Like most other Unix systems, set the ctime for inodes on a
1150 * rename.
1151 */
1152 old_inode->i_ctime = current_time(old_inode);
1153 mark_inode_dirty(old_inode);
1154
1155 /*
1156 * ok, that's it
1157 */
1158 ncfi.fileVersionNum = ocfi.fileVersionNum;
1159 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1160 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1161 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1162
1163 /* The old fid may have moved - find it again */
1164 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1165 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1166
1167 if (new_inode) {
1168 new_inode->i_ctime = current_time(new_inode);
1169 inode_dec_link_count(new_inode);
1170 }
1171 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1172 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1173 mark_inode_dirty(old_dir);
1174 mark_inode_dirty(new_dir);
1175
1176 if (dir_fi) {
1177 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1178 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1179 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1180 mark_inode_dirty(old_inode);
1181 else
1182 mark_buffer_dirty_inode(dir_bh, old_inode);
1183
1184 inode_dec_link_count(old_dir);
1185 if (new_inode)
1186 inode_dec_link_count(new_inode);
1187 else {
1188 inc_nlink(new_dir);
1189 mark_inode_dirty(new_dir);
1190 }
1191 }
1192
1193 if (ofi) {
1194 if (ofibh.sbh != ofibh.ebh)
1195 brelse(ofibh.ebh);
1196 brelse(ofibh.sbh);
1197 }
1198
1199 retval = 0;
1200
1201 end_rename:
1202 brelse(dir_bh);
1203 if (nfi) {
1204 if (nfibh.sbh != nfibh.ebh)
1205 brelse(nfibh.ebh);
1206 brelse(nfibh.sbh);
1207 }
1208
1209 return retval;
1210 }
1211
udf_get_parent(struct dentry * child)1212 static struct dentry *udf_get_parent(struct dentry *child)
1213 {
1214 struct kernel_lb_addr tloc;
1215 struct inode *inode = NULL;
1216 struct qstr dotdot = QSTR_INIT("..", 2);
1217 struct fileIdentDesc cfi;
1218 struct udf_fileident_bh fibh;
1219
1220 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1221 return ERR_PTR(-EACCES);
1222
1223 if (fibh.sbh != fibh.ebh)
1224 brelse(fibh.ebh);
1225 brelse(fibh.sbh);
1226
1227 tloc = lelb_to_cpu(cfi.icb.extLocation);
1228 inode = udf_iget(child->d_sb, &tloc);
1229 if (IS_ERR(inode))
1230 return ERR_CAST(inode);
1231
1232 return d_obtain_alias(inode);
1233 }
1234
1235
udf_nfs_get_inode(struct super_block * sb,u32 block,u16 partref,__u32 generation)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 (IS_ERR(inode))
1250 return ERR_CAST(inode);
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
udf_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)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 ||
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
udf_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)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 }
udf_encode_fh(struct inode * inode,__u32 * fh,int * lenp,struct inode * parent)1281 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1282 struct inode *parent)
1283 {
1284 int len = *lenp;
1285 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1286 struct fid *fid = (struct fid *)fh;
1287 int type = FILEID_UDF_WITHOUT_PARENT;
1288
1289 if (parent && (len < 5)) {
1290 *lenp = 5;
1291 return FILEID_INVALID;
1292 } else if (len < 3) {
1293 *lenp = 3;
1294 return FILEID_INVALID;
1295 }
1296
1297 *lenp = 3;
1298 fid->udf.block = location.logicalBlockNum;
1299 fid->udf.partref = location.partitionReferenceNum;
1300 fid->udf.parent_partref = 0;
1301 fid->udf.generation = inode->i_generation;
1302
1303 if (parent) {
1304 location = UDF_I(parent)->i_location;
1305 fid->udf.parent_block = location.logicalBlockNum;
1306 fid->udf.parent_partref = location.partitionReferenceNum;
1307 fid->udf.parent_generation = inode->i_generation;
1308 *lenp = 5;
1309 type = FILEID_UDF_WITH_PARENT;
1310 }
1311
1312 return type;
1313 }
1314
1315 const struct export_operations udf_export_ops = {
1316 .encode_fh = udf_encode_fh,
1317 .fh_to_dentry = udf_fh_to_dentry,
1318 .fh_to_parent = udf_fh_to_parent,
1319 .get_parent = udf_get_parent,
1320 };
1321
1322 const struct inode_operations udf_dir_inode_operations = {
1323 .lookup = udf_lookup,
1324 .create = udf_create,
1325 .link = udf_link,
1326 .unlink = udf_unlink,
1327 .symlink = udf_symlink,
1328 .mkdir = udf_mkdir,
1329 .rmdir = udf_rmdir,
1330 .mknod = udf_mknod,
1331 .rename = udf_rename,
1332 .tmpfile = udf_tmpfile,
1333 };
1334
