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r8152: Check for supported Wake-on-LAN Modes
[linux-2.6/btrfs-unstable.git] / fs / udf / namei.c
blob58cc2414992b673296ff2d9408c62f3bd07b6f35
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 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
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 #ifdef UDF_RECOVERY
308 /* temporary shorthand for specifying files by inode number */
309 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
310 struct kernel_lb_addr lb = {
311 .logicalBlockNum = 0,
312 .partitionReferenceNum =
313 simple_strtoul(dentry->d_name.name + 3,
314 NULL, 0),
315 };
316 inode = udf_iget(dir->i_sb, lb);
317 if (IS_ERR(inode))
318 return inode;
319 } else
320 #endif /* UDF_RECOVERY */
321
322 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
323 if (IS_ERR(fi))
324 return ERR_CAST(fi);
325
326 if (fi) {
327 struct kernel_lb_addr loc;
328
329 if (fibh.sbh != fibh.ebh)
330 brelse(fibh.ebh);
331 brelse(fibh.sbh);
332
333 loc = lelb_to_cpu(cfi.icb.extLocation);
334 inode = udf_iget(dir->i_sb, &loc);
335 if (IS_ERR(inode))
336 return ERR_CAST(inode);
337 }
338
339 return d_splice_alias(inode, dentry);
340 }
341
342 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
343 struct dentry *dentry,
344 struct udf_fileident_bh *fibh,
345 struct fileIdentDesc *cfi, int *err)
346 {
347 struct super_block *sb = dir->i_sb;
348 struct fileIdentDesc *fi = NULL;
349 unsigned char *name = NULL;
350 int namelen;
351 loff_t f_pos;
352 loff_t size = udf_ext0_offset(dir) + dir->i_size;
353 int nfidlen;
354 udf_pblk_t block;
355 struct kernel_lb_addr eloc;
356 uint32_t elen = 0;
357 sector_t offset;
358 struct extent_position epos = {};
359 struct udf_inode_info *dinfo;
360
361 fibh->sbh = fibh->ebh = NULL;
362 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
363 if (!name) {
364 *err = -ENOMEM;
365 goto out_err;
366 }
367
368 if (dentry) {
369 if (!dentry->d_name.len) {
370 *err = -EINVAL;
371 goto out_err;
372 }
373 namelen = udf_put_filename(sb, dentry->d_name.name,
374 dentry->d_name.len,
375 name, UDF_NAME_LEN_CS0);
376 if (!namelen) {
377 *err = -ENAMETOOLONG;
378 goto out_err;
379 }
380 } else {
381 namelen = 0;
382 }
383
384 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
385
386 f_pos = udf_ext0_offset(dir);
387
388 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
389 dinfo = UDF_I(dir);
390 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
391 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
392 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
393 block = udf_get_lb_pblock(dir->i_sb,
394 &dinfo->i_location, 0);
395 fibh->soffset = fibh->eoffset = sb->s_blocksize;
396 goto add;
397 }
398 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
399 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
400 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
401 epos.offset -= sizeof(struct short_ad);
402 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
403 epos.offset -= sizeof(struct long_ad);
404 } else
405 offset = 0;
406
407 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
408 if (!fibh->sbh) {
409 *err = -EIO;
410 goto out_err;
411 }
412
413 block = dinfo->i_location.logicalBlockNum;
414 }
415
416 while (f_pos < size) {
417 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
418 &elen, &offset);
419
420 if (!fi) {
421 *err = -EIO;
422 goto out_err;
423 }
424
425 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
426 if (udf_dir_entry_len(cfi) == nfidlen) {
427 cfi->descTag.tagSerialNum = cpu_to_le16(1);
428 cfi->fileVersionNum = cpu_to_le16(1);
429 cfi->fileCharacteristics = 0;
430 cfi->lengthFileIdent = namelen;
431 cfi->lengthOfImpUse = cpu_to_le16(0);
432 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
433 name))
434 goto out_ok;
435 else {
436 *err = -EIO;
437 goto out_err;
438 }
439 }
440 }
441 }
442
443 add:
444 f_pos += nfidlen;
445
446 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
447 sb->s_blocksize - fibh->eoffset < nfidlen) {
448 brelse(epos.bh);
449 epos.bh = NULL;
450 fibh->soffset -= udf_ext0_offset(dir);
451 fibh->eoffset -= udf_ext0_offset(dir);
452 f_pos -= udf_ext0_offset(dir);
453 if (fibh->sbh != fibh->ebh)
454 brelse(fibh->ebh);
455 brelse(fibh->sbh);
456 fibh->sbh = fibh->ebh =
457 udf_expand_dir_adinicb(dir, &block, err);
458 if (!fibh->sbh)
459 goto out_err;
460 epos.block = dinfo->i_location;
461 epos.offset = udf_file_entry_alloc_offset(dir);
462 /* Load extent udf_expand_dir_adinicb() has created */
463 udf_current_aext(dir, &epos, &eloc, &elen, 1);
464 }
465
466 /* Entry fits into current block? */
467 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
468 fibh->soffset = fibh->eoffset;
469 fibh->eoffset += nfidlen;
470 if (fibh->sbh != fibh->ebh) {
471 brelse(fibh->sbh);
472 fibh->sbh = fibh->ebh;
473 }
474
475 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
476 block = dinfo->i_location.logicalBlockNum;
477 fi = (struct fileIdentDesc *)
478 (dinfo->i_ext.i_data +
479 fibh->soffset -
480 udf_ext0_offset(dir) +
481 dinfo->i_lenEAttr);
482 } else {
483 block = eloc.logicalBlockNum +
484 ((elen - 1) >>
485 dir->i_sb->s_blocksize_bits);
486 fi = (struct fileIdentDesc *)
487 (fibh->sbh->b_data + fibh->soffset);
488 }
489 } else {
490 /* Round up last extent in the file */
491 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
492 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
493 epos.offset -= sizeof(struct short_ad);
494 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
495 epos.offset -= sizeof(struct long_ad);
496 udf_write_aext(dir, &epos, &eloc, elen, 1);
497 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
498 - 1) & ~(sb->s_blocksize - 1);
499
500 fibh->soffset = fibh->eoffset - sb->s_blocksize;
501 fibh->eoffset += nfidlen - sb->s_blocksize;
502 if (fibh->sbh != fibh->ebh) {
503 brelse(fibh->sbh);
504 fibh->sbh = fibh->ebh;
505 }
506
507 block = eloc.logicalBlockNum + ((elen - 1) >>
508 dir->i_sb->s_blocksize_bits);
509 fibh->ebh = udf_bread(dir,
510 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
511 if (!fibh->ebh)
512 goto out_err;
513 /* Extents could have been merged, invalidate our position */
514 brelse(epos.bh);
515 epos.bh = NULL;
516 epos.block = dinfo->i_location;
517 epos.offset = udf_file_entry_alloc_offset(dir);
518
519 if (!fibh->soffset) {
520 /* Find the freshly allocated block */
521 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
522 (EXT_RECORDED_ALLOCATED >> 30))
523 ;
524 block = eloc.logicalBlockNum + ((elen - 1) >>
525 dir->i_sb->s_blocksize_bits);
526 brelse(fibh->sbh);
527 fibh->sbh = fibh->ebh;
528 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
529 } else {
530 fi = (struct fileIdentDesc *)
531 (fibh->sbh->b_data + sb->s_blocksize +
532 fibh->soffset);
533 }
534 }
535
536 memset(cfi, 0, sizeof(struct fileIdentDesc));
537 if (UDF_SB(sb)->s_udfrev >= 0x0200)
538 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
539 sizeof(struct tag));
540 else
541 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
542 sizeof(struct tag));
543 cfi->fileVersionNum = cpu_to_le16(1);
544 cfi->lengthFileIdent = namelen;
545 cfi->lengthOfImpUse = cpu_to_le16(0);
546 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
547 dir->i_size += nfidlen;
548 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
549 dinfo->i_lenAlloc += nfidlen;
550 else {
551 /* Find the last extent and truncate it to proper size */
552 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
553 (EXT_RECORDED_ALLOCATED >> 30))
554 ;
555 elen -= dinfo->i_lenExtents - dir->i_size;
556 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
557 epos.offset -= sizeof(struct short_ad);
558 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
559 epos.offset -= sizeof(struct long_ad);
560 udf_write_aext(dir, &epos, &eloc, elen, 1);
561 dinfo->i_lenExtents = dir->i_size;
562 }
563
564 mark_inode_dirty(dir);
565 goto out_ok;
566 } else {
567 *err = -EIO;
568 goto out_err;
569 }
570
571 out_err:
572 fi = NULL;
573 if (fibh->sbh != fibh->ebh)
574 brelse(fibh->ebh);
575 brelse(fibh->sbh);
576 out_ok:
577 brelse(epos.bh);
578 kfree(name);
579 return fi;
580 }
581
582 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
583 struct udf_fileident_bh *fibh,
584 struct fileIdentDesc *cfi)
585 {
586 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
587
588 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
589 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
590
591 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
592 }
593
594 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
595 {
596 struct udf_inode_info *iinfo = UDF_I(inode);
597 struct inode *dir = d_inode(dentry->d_parent);
598 struct udf_fileident_bh fibh;
599 struct fileIdentDesc cfi, *fi;
600 int err;
601
602 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
603 if (unlikely(!fi)) {
604 inode_dec_link_count(inode);
605 discard_new_inode(inode);
606 return err;
607 }
608 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
609 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
610 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
611 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
612 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
613 dir->i_ctime = dir->i_mtime = current_time(dir);
614 mark_inode_dirty(dir);
615 if (fibh.sbh != fibh.ebh)
616 brelse(fibh.ebh);
617 brelse(fibh.sbh);
618 d_instantiate_new(dentry, inode);
619
620 return 0;
621 }
622
623 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
624 bool excl)
625 {
626 struct inode *inode = udf_new_inode(dir, mode);
627
628 if (IS_ERR(inode))
629 return PTR_ERR(inode);
630
631 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
632 inode->i_data.a_ops = &udf_adinicb_aops;
633 else
634 inode->i_data.a_ops = &udf_aops;
635 inode->i_op = &udf_file_inode_operations;
636 inode->i_fop = &udf_file_operations;
637 mark_inode_dirty(inode);
638
639 return udf_add_nondir(dentry, inode);
640 }
641
642 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
643 {
644 struct inode *inode = udf_new_inode(dir, mode);
645
646 if (IS_ERR(inode))
647 return PTR_ERR(inode);
648
649 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
650 inode->i_data.a_ops = &udf_adinicb_aops;
651 else
652 inode->i_data.a_ops = &udf_aops;
653 inode->i_op = &udf_file_inode_operations;
654 inode->i_fop = &udf_file_operations;
655 mark_inode_dirty(inode);
656 d_tmpfile(dentry, inode);
657 unlock_new_inode(inode);
658 return 0;
659 }
660
661 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
662 dev_t rdev)
663 {
664 struct inode *inode;
665
666 if (!old_valid_dev(rdev))
667 return -EINVAL;
668
669 inode = udf_new_inode(dir, mode);
670 if (IS_ERR(inode))
671 return PTR_ERR(inode);
672
673 init_special_inode(inode, mode, rdev);
674 return udf_add_nondir(dentry, inode);
675 }
676
677 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
678 {
679 struct inode *inode;
680 struct udf_fileident_bh fibh;
681 struct fileIdentDesc cfi, *fi;
682 int err;
683 struct udf_inode_info *dinfo = UDF_I(dir);
684 struct udf_inode_info *iinfo;
685
686 inode = udf_new_inode(dir, S_IFDIR | mode);
687 if (IS_ERR(inode))
688 return PTR_ERR(inode);
689
690 iinfo = UDF_I(inode);
691 inode->i_op = &udf_dir_inode_operations;
692 inode->i_fop = &udf_dir_operations;
693 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
694 if (!fi) {
695 inode_dec_link_count(inode);
696 discard_new_inode(inode);
697 goto out;
698 }
699 set_nlink(inode, 2);
700 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
701 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
702 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
703 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
704 cfi.fileCharacteristics =
705 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
706 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
707 brelse(fibh.sbh);
708 mark_inode_dirty(inode);
709
710 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
711 if (!fi) {
712 clear_nlink(inode);
713 mark_inode_dirty(inode);
714 discard_new_inode(inode);
715 goto out;
716 }
717 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
718 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
719 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
720 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
721 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
722 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
723 inc_nlink(dir);
724 dir->i_ctime = dir->i_mtime = current_time(dir);
725 mark_inode_dirty(dir);
726 d_instantiate_new(dentry, inode);
727 if (fibh.sbh != fibh.ebh)
728 brelse(fibh.ebh);
729 brelse(fibh.sbh);
730 err = 0;
731
732 out:
733 return err;
734 }
735
736 static int empty_dir(struct inode *dir)
737 {
738 struct fileIdentDesc *fi, cfi;
739 struct udf_fileident_bh fibh;
740 loff_t f_pos;
741 loff_t size = udf_ext0_offset(dir) + dir->i_size;
742 udf_pblk_t block;
743 struct kernel_lb_addr eloc;
744 uint32_t elen;
745 sector_t offset;
746 struct extent_position epos = {};
747 struct udf_inode_info *dinfo = UDF_I(dir);
748
749 f_pos = udf_ext0_offset(dir);
750 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
751
752 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
753 fibh.sbh = fibh.ebh = NULL;
754 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
755 &epos, &eloc, &elen, &offset) ==
756 (EXT_RECORDED_ALLOCATED >> 30)) {
757 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
758 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
759 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
760 epos.offset -= sizeof(struct short_ad);
761 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
762 epos.offset -= sizeof(struct long_ad);
763 } else
764 offset = 0;
765
766 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
767 if (!fibh.sbh) {
768 brelse(epos.bh);
769 return 0;
770 }
771 } else {
772 brelse(epos.bh);
773 return 0;
774 }
775
776 while (f_pos < size) {
777 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
778 &elen, &offset);
779 if (!fi) {
780 if (fibh.sbh != fibh.ebh)
781 brelse(fibh.ebh);
782 brelse(fibh.sbh);
783 brelse(epos.bh);
784 return 0;
785 }
786
787 if (cfi.lengthFileIdent &&
788 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
789 if (fibh.sbh != fibh.ebh)
790 brelse(fibh.ebh);
791 brelse(fibh.sbh);
792 brelse(epos.bh);
793 return 0;
794 }
795 }
796
797 if (fibh.sbh != fibh.ebh)
798 brelse(fibh.ebh);
799 brelse(fibh.sbh);
800 brelse(epos.bh);
801
802 return 1;
803 }
804
805 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
806 {
807 int retval;
808 struct inode *inode = d_inode(dentry);
809 struct udf_fileident_bh fibh;
810 struct fileIdentDesc *fi, cfi;
811 struct kernel_lb_addr tloc;
812
813 retval = -ENOENT;
814 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
815 if (IS_ERR_OR_NULL(fi)) {
816 if (fi)
817 retval = PTR_ERR(fi);
818 goto out;
819 }
820
821 retval = -EIO;
822 tloc = lelb_to_cpu(cfi.icb.extLocation);
823 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
824 goto end_rmdir;
825 retval = -ENOTEMPTY;
826 if (!empty_dir(inode))
827 goto end_rmdir;
828 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
829 if (retval)
830 goto end_rmdir;
831 if (inode->i_nlink != 2)
832 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
833 inode->i_nlink);
834 clear_nlink(inode);
835 inode->i_size = 0;
836 inode_dec_link_count(dir);
837 inode->i_ctime = dir->i_ctime = dir->i_mtime =
838 current_time(inode);
839 mark_inode_dirty(dir);
840
841 end_rmdir:
842 if (fibh.sbh != fibh.ebh)
843 brelse(fibh.ebh);
844 brelse(fibh.sbh);
845
846 out:
847 return retval;
848 }
849
850 static int udf_unlink(struct inode *dir, struct dentry *dentry)
851 {
852 int retval;
853 struct inode *inode = d_inode(dentry);
854 struct udf_fileident_bh fibh;
855 struct fileIdentDesc *fi;
856 struct fileIdentDesc cfi;
857 struct kernel_lb_addr tloc;
858
859 retval = -ENOENT;
860 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
861
862 if (IS_ERR_OR_NULL(fi)) {
863 if (fi)
864 retval = PTR_ERR(fi);
865 goto out;
866 }
867
868 retval = -EIO;
869 tloc = lelb_to_cpu(cfi.icb.extLocation);
870 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
871 goto end_unlink;
872
873 if (!inode->i_nlink) {
874 udf_debug("Deleting nonexistent file (%lu), %u\n",
875 inode->i_ino, inode->i_nlink);
876 set_nlink(inode, 1);
877 }
878 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
879 if (retval)
880 goto end_unlink;
881 dir->i_ctime = dir->i_mtime = current_time(dir);
882 mark_inode_dirty(dir);
883 inode_dec_link_count(inode);
884 inode->i_ctime = dir->i_ctime;
885 retval = 0;
886
887 end_unlink:
888 if (fibh.sbh != fibh.ebh)
889 brelse(fibh.ebh);
890 brelse(fibh.sbh);
891
892 out:
893 return retval;
894 }
895
896 static int udf_symlink(struct inode *dir, struct dentry *dentry,
897 const char *symname)
898 {
899 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
900 struct pathComponent *pc;
901 const char *compstart;
902 struct extent_position epos = {};
903 int eoffset, elen = 0;
904 uint8_t *ea;
905 int err;
906 udf_pblk_t block;
907 unsigned char *name = NULL;
908 int namelen;
909 struct udf_inode_info *iinfo;
910 struct super_block *sb = dir->i_sb;
911
912 if (IS_ERR(inode))
913 return PTR_ERR(inode);
914
915 iinfo = UDF_I(inode);
916 down_write(&iinfo->i_data_sem);
917 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
918 if (!name) {
919 err = -ENOMEM;
920 goto out_no_entry;
921 }
922
923 inode->i_data.a_ops = &udf_symlink_aops;
924 inode->i_op = &udf_symlink_inode_operations;
925 inode_nohighmem(inode);
926
927 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
928 struct kernel_lb_addr eloc;
929 uint32_t bsize;
930
931 block = udf_new_block(sb, inode,
932 iinfo->i_location.partitionReferenceNum,
933 iinfo->i_location.logicalBlockNum, &err);
934 if (!block)
935 goto out_no_entry;
936 epos.block = iinfo->i_location;
937 epos.offset = udf_file_entry_alloc_offset(inode);
938 epos.bh = NULL;
939 eloc.logicalBlockNum = block;
940 eloc.partitionReferenceNum =
941 iinfo->i_location.partitionReferenceNum;
942 bsize = sb->s_blocksize;
943 iinfo->i_lenExtents = bsize;
944 udf_add_aext(inode, &epos, &eloc, bsize, 0);
945 brelse(epos.bh);
946
947 block = udf_get_pblock(sb, block,
948 iinfo->i_location.partitionReferenceNum,
949 0);
950 epos.bh = udf_tgetblk(sb, block);
951 lock_buffer(epos.bh);
952 memset(epos.bh->b_data, 0x00, bsize);
953 set_buffer_uptodate(epos.bh);
954 unlock_buffer(epos.bh);
955 mark_buffer_dirty_inode(epos.bh, inode);
956 ea = epos.bh->b_data + udf_ext0_offset(inode);
957 } else
958 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
959
960 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
961 pc = (struct pathComponent *)ea;
962
963 if (*symname == '/') {
964 do {
965 symname++;
966 } while (*symname == '/');
967
968 pc->componentType = 1;
969 pc->lengthComponentIdent = 0;
970 pc->componentFileVersionNum = 0;
971 elen += sizeof(struct pathComponent);
972 }
973
974 err = -ENAMETOOLONG;
975
976 while (*symname) {
977 if (elen + sizeof(struct pathComponent) > eoffset)
978 goto out_no_entry;
979
980 pc = (struct pathComponent *)(ea + elen);
981
982 compstart = symname;
983
984 do {
985 symname++;
986 } while (*symname && *symname != '/');
987
988 pc->componentType = 5;
989 pc->lengthComponentIdent = 0;
990 pc->componentFileVersionNum = 0;
991 if (compstart[0] == '.') {
992 if ((symname - compstart) == 1)
993 pc->componentType = 4;
994 else if ((symname - compstart) == 2 &&
995 compstart[1] == '.')
996 pc->componentType = 3;
997 }
998
999 if (pc->componentType == 5) {
1000 namelen = udf_put_filename(sb, compstart,
1001 symname - compstart,
1002 name, UDF_NAME_LEN_CS0);
1003 if (!namelen)
1004 goto out_no_entry;
1005
1006 if (elen + sizeof(struct pathComponent) + namelen >
1007 eoffset)
1008 goto out_no_entry;
1009 else
1010 pc->lengthComponentIdent = namelen;
1011
1012 memcpy(pc->componentIdent, name, namelen);
1013 }
1014
1015 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1016
1017 if (*symname) {
1018 do {
1019 symname++;
1020 } while (*symname == '/');
1021 }
1022 }
1023
1024 brelse(epos.bh);
1025 inode->i_size = elen;
1026 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1027 iinfo->i_lenAlloc = inode->i_size;
1028 else
1029 udf_truncate_tail_extent(inode);
1030 mark_inode_dirty(inode);
1031 up_write(&iinfo->i_data_sem);
1032
1033 err = udf_add_nondir(dentry, inode);
1034 out:
1035 kfree(name);
1036 return err;
1037
1038 out_no_entry:
1039 up_write(&iinfo->i_data_sem);
1040 inode_dec_link_count(inode);
1041 discard_new_inode(inode);
1042 goto out;
1043 }
1044
1045 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1046 struct dentry *dentry)
1047 {
1048 struct inode *inode = d_inode(old_dentry);
1049 struct udf_fileident_bh fibh;
1050 struct fileIdentDesc cfi, *fi;
1051 int err;
1052
1053 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1054 if (!fi) {
1055 return err;
1056 }
1057 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1058 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1059 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1060 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1061 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1062 }
1063 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1064 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1065 mark_inode_dirty(dir);
1066
1067 if (fibh.sbh != fibh.ebh)
1068 brelse(fibh.ebh);
1069 brelse(fibh.sbh);
1070 inc_nlink(inode);
1071 inode->i_ctime = current_time(inode);
1072 mark_inode_dirty(inode);
1073 dir->i_ctime = dir->i_mtime = current_time(dir);
1074 mark_inode_dirty(dir);
1075 ihold(inode);
1076 d_instantiate(dentry, inode);
1077
1078 return 0;
1079 }
1080
1081 /* Anybody can rename anything with this: the permission checks are left to the
1082 * higher-level routines.
1083 */
1084 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1085 struct inode *new_dir, struct dentry *new_dentry,
1086 unsigned int flags)
1087 {
1088 struct inode *old_inode = d_inode(old_dentry);
1089 struct inode *new_inode = d_inode(new_dentry);
1090 struct udf_fileident_bh ofibh, nfibh;
1091 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1092 struct fileIdentDesc ocfi, ncfi;
1093 struct buffer_head *dir_bh = NULL;
1094 int retval = -ENOENT;
1095 struct kernel_lb_addr tloc;
1096 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1097
1098 if (flags & ~RENAME_NOREPLACE)
1099 return -EINVAL;
1100
1101 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1102 if (IS_ERR(ofi)) {
1103 retval = PTR_ERR(ofi);
1104 goto end_rename;
1105 }
1106
1107 if (ofibh.sbh != ofibh.ebh)
1108 brelse(ofibh.ebh);
1109
1110 brelse(ofibh.sbh);
1111 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1112 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1113 != old_inode->i_ino)
1114 goto end_rename;
1115
1116 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1117 if (IS_ERR(nfi)) {
1118 retval = PTR_ERR(nfi);
1119 goto end_rename;
1120 }
1121 if (nfi && !new_inode) {
1122 if (nfibh.sbh != nfibh.ebh)
1123 brelse(nfibh.ebh);
1124 brelse(nfibh.sbh);
1125 nfi = NULL;
1126 }
1127 if (S_ISDIR(old_inode->i_mode)) {
1128 int offset = udf_ext0_offset(old_inode);
1129
1130 if (new_inode) {
1131 retval = -ENOTEMPTY;
1132 if (!empty_dir(new_inode))
1133 goto end_rename;
1134 }
1135 retval = -EIO;
1136 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1137 dir_fi = udf_get_fileident(
1138 old_iinfo->i_ext.i_data -
1139 (old_iinfo->i_efe ?
1140 sizeof(struct extendedFileEntry) :
1141 sizeof(struct fileEntry)),
1142 old_inode->i_sb->s_blocksize, &offset);
1143 } else {
1144 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1145 if (!dir_bh)
1146 goto end_rename;
1147 dir_fi = udf_get_fileident(dir_bh->b_data,
1148 old_inode->i_sb->s_blocksize, &offset);
1149 }
1150 if (!dir_fi)
1151 goto end_rename;
1152 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1153 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1154 old_dir->i_ino)
1155 goto end_rename;
1156 }
1157 if (!nfi) {
1158 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1159 &retval);
1160 if (!nfi)
1161 goto end_rename;
1162 }
1163
1164 /*
1165 * Like most other Unix systems, set the ctime for inodes on a
1166 * rename.
1167 */
1168 old_inode->i_ctime = current_time(old_inode);
1169 mark_inode_dirty(old_inode);
1170
1171 /*
1172 * ok, that's it
1173 */
1174 ncfi.fileVersionNum = ocfi.fileVersionNum;
1175 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1176 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1177 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1178
1179 /* The old fid may have moved - find it again */
1180 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1181 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1182
1183 if (new_inode) {
1184 new_inode->i_ctime = current_time(new_inode);
1185 inode_dec_link_count(new_inode);
1186 }
1187 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1188 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1189 mark_inode_dirty(old_dir);
1190 mark_inode_dirty(new_dir);
1191
1192 if (dir_fi) {
1193 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1194 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1195 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1196 mark_inode_dirty(old_inode);
1197 else
1198 mark_buffer_dirty_inode(dir_bh, old_inode);
1199
1200 inode_dec_link_count(old_dir);
1201 if (new_inode)
1202 inode_dec_link_count(new_inode);
1203 else {
1204 inc_nlink(new_dir);
1205 mark_inode_dirty(new_dir);
1206 }
1207 }
1208
1209 if (ofi) {
1210 if (ofibh.sbh != ofibh.ebh)
1211 brelse(ofibh.ebh);
1212 brelse(ofibh.sbh);
1213 }
1214
1215 retval = 0;
1216
1217 end_rename:
1218 brelse(dir_bh);
1219 if (nfi) {
1220 if (nfibh.sbh != nfibh.ebh)
1221 brelse(nfibh.ebh);
1222 brelse(nfibh.sbh);
1223 }
1224
1225 return retval;
1226 }
1227
1228 static struct dentry *udf_get_parent(struct dentry *child)
1229 {
1230 struct kernel_lb_addr tloc;
1231 struct inode *inode = NULL;
1232 struct qstr dotdot = QSTR_INIT("..", 2);
1233 struct fileIdentDesc cfi;
1234 struct udf_fileident_bh fibh;
1235
1236 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1237 return ERR_PTR(-EACCES);
1238
1239 if (fibh.sbh != fibh.ebh)
1240 brelse(fibh.ebh);
1241 brelse(fibh.sbh);
1242
1243 tloc = lelb_to_cpu(cfi.icb.extLocation);
1244 inode = udf_iget(child->d_sb, &tloc);
1245 if (IS_ERR(inode))
1246 return ERR_CAST(inode);
1247
1248 return d_obtain_alias(inode);
1249 }
1250
1251
1252 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1253 u16 partref, __u32 generation)
1254 {
1255 struct inode *inode;
1256 struct kernel_lb_addr loc;
1257
1258 if (block == 0)
1259 return ERR_PTR(-ESTALE);
1260
1261 loc.logicalBlockNum = block;
1262 loc.partitionReferenceNum = partref;
1263 inode = udf_iget(sb, &loc);
1264
1265 if (IS_ERR(inode))
1266 return ERR_CAST(inode);
1267
1268 if (generation && inode->i_generation != generation) {
1269 iput(inode);
1270 return ERR_PTR(-ESTALE);
1271 }
1272 return d_obtain_alias(inode);
1273 }
1274
1275 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1276 struct fid *fid, int fh_len, int fh_type)
1277 {
1278 if (fh_len < 3 ||
1279 (fh_type != FILEID_UDF_WITH_PARENT &&
1280 fh_type != FILEID_UDF_WITHOUT_PARENT))
1281 return NULL;
1282
1283 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1284 fid->udf.generation);
1285 }
1286
1287 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1288 struct fid *fid, int fh_len, int fh_type)
1289 {
1290 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1291 return NULL;
1292
1293 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1294 fid->udf.parent_partref,
1295 fid->udf.parent_generation);
1296 }
1297 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1298 struct inode *parent)
1299 {
1300 int len = *lenp;
1301 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1302 struct fid *fid = (struct fid *)fh;
1303 int type = FILEID_UDF_WITHOUT_PARENT;
1304
1305 if (parent && (len < 5)) {
1306 *lenp = 5;
1307 return FILEID_INVALID;
1308 } else if (len < 3) {
1309 *lenp = 3;
1310 return FILEID_INVALID;
1311 }
1312
1313 *lenp = 3;
1314 fid->udf.block = location.logicalBlockNum;
1315 fid->udf.partref = location.partitionReferenceNum;
1316 fid->udf.parent_partref = 0;
1317 fid->udf.generation = inode->i_generation;
1318
1319 if (parent) {
1320 location = UDF_I(parent)->i_location;
1321 fid->udf.parent_block = location.logicalBlockNum;
1322 fid->udf.parent_partref = location.partitionReferenceNum;
1323 fid->udf.parent_generation = inode->i_generation;
1324 *lenp = 5;
1325 type = FILEID_UDF_WITH_PARENT;
1326 }
1327
1328 return type;
1329 }
1330
1331 const struct export_operations udf_export_ops = {
1332 .encode_fh = udf_encode_fh,
1333 .fh_to_dentry = udf_fh_to_dentry,
1334 .fh_to_parent = udf_fh_to_parent,
1335 .get_parent = udf_get_parent,
1336 };
1337
1338 const struct inode_operations udf_dir_inode_operations = {
1339 .lookup = udf_lookup,
1340 .create = udf_create,
1341 .link = udf_link,
1342 .unlink = udf_unlink,
1343 .symlink = udf_symlink,
1344 .mkdir = udf_mkdir,
1345 .rmdir = udf_rmdir,
1346 .mknod = udf_mknod,
1347 .rename = udf_rename,
1348 .tmpfile = udf_tmpfile,
1349 };
(deprecated) Btrfs devel tree