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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[deliverable/linux.git] / fs / udf / namei.c
1 /*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
15 *
16 * HISTORY
17 *
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
20 */
21
22 #include "udfdecl.h"
23
24 #include "udf_i.h"
25 #include "udf_sb.h"
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/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_fs_time(dir->i_sb);
620 mark_inode_dirty(dir);
621 if (fibh.sbh != fibh.ebh)
622 brelse(fibh.ebh);
623 brelse(fibh.sbh);
624 unlock_new_inode(inode);
625 d_instantiate(dentry, inode);
626
627 return 0;
628 }
629
630 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
631 bool excl)
632 {
633 struct inode *inode = udf_new_inode(dir, mode);
634
635 if (IS_ERR(inode))
636 return PTR_ERR(inode);
637
638 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
639 inode->i_data.a_ops = &udf_adinicb_aops;
640 else
641 inode->i_data.a_ops = &udf_aops;
642 inode->i_op = &udf_file_inode_operations;
643 inode->i_fop = &udf_file_operations;
644 mark_inode_dirty(inode);
645
646 return udf_add_nondir(dentry, inode);
647 }
648
649 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
650 {
651 struct inode *inode = udf_new_inode(dir, mode);
652
653 if (IS_ERR(inode))
654 return PTR_ERR(inode);
655
656 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
657 inode->i_data.a_ops = &udf_adinicb_aops;
658 else
659 inode->i_data.a_ops = &udf_aops;
660 inode->i_op = &udf_file_inode_operations;
661 inode->i_fop = &udf_file_operations;
662 mark_inode_dirty(inode);
663 d_tmpfile(dentry, inode);
664 unlock_new_inode(inode);
665 return 0;
666 }
667
668 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
669 dev_t rdev)
670 {
671 struct inode *inode;
672
673 if (!old_valid_dev(rdev))
674 return -EINVAL;
675
676 inode = udf_new_inode(dir, mode);
677 if (IS_ERR(inode))
678 return PTR_ERR(inode);
679
680 init_special_inode(inode, mode, rdev);
681 return udf_add_nondir(dentry, inode);
682 }
683
684 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
685 {
686 struct inode *inode;
687 struct udf_fileident_bh fibh;
688 struct fileIdentDesc cfi, *fi;
689 int err;
690 struct udf_inode_info *dinfo = UDF_I(dir);
691 struct udf_inode_info *iinfo;
692
693 inode = udf_new_inode(dir, S_IFDIR | mode);
694 if (IS_ERR(inode))
695 return PTR_ERR(inode);
696
697 iinfo = UDF_I(inode);
698 inode->i_op = &udf_dir_inode_operations;
699 inode->i_fop = &udf_dir_operations;
700 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
701 if (!fi) {
702 inode_dec_link_count(inode);
703 unlock_new_inode(inode);
704 iput(inode);
705 goto out;
706 }
707 set_nlink(inode, 2);
708 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
709 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
710 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
711 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
712 cfi.fileCharacteristics =
713 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
714 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
715 brelse(fibh.sbh);
716 mark_inode_dirty(inode);
717
718 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
719 if (!fi) {
720 clear_nlink(inode);
721 mark_inode_dirty(inode);
722 unlock_new_inode(inode);
723 iput(inode);
724 goto out;
725 }
726 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
727 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
728 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
729 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
730 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
731 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
732 inc_nlink(dir);
733 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
734 mark_inode_dirty(dir);
735 unlock_new_inode(inode);
736 d_instantiate(dentry, inode);
737 if (fibh.sbh != fibh.ebh)
738 brelse(fibh.ebh);
739 brelse(fibh.sbh);
740 err = 0;
741
742 out:
743 return err;
744 }
745
746 static int empty_dir(struct inode *dir)
747 {
748 struct fileIdentDesc *fi, cfi;
749 struct udf_fileident_bh fibh;
750 loff_t f_pos;
751 loff_t size = udf_ext0_offset(dir) + dir->i_size;
752 int block;
753 struct kernel_lb_addr eloc;
754 uint32_t elen;
755 sector_t offset;
756 struct extent_position epos = {};
757 struct udf_inode_info *dinfo = UDF_I(dir);
758
759 f_pos = udf_ext0_offset(dir);
760 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
761
762 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
763 fibh.sbh = fibh.ebh = NULL;
764 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
765 &epos, &eloc, &elen, &offset) ==
766 (EXT_RECORDED_ALLOCATED >> 30)) {
767 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
768 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
769 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
770 epos.offset -= sizeof(struct short_ad);
771 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
772 epos.offset -= sizeof(struct long_ad);
773 } else
774 offset = 0;
775
776 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
777 if (!fibh.sbh) {
778 brelse(epos.bh);
779 return 0;
780 }
781 } else {
782 brelse(epos.bh);
783 return 0;
784 }
785
786 while (f_pos < size) {
787 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
788 &elen, &offset);
789 if (!fi) {
790 if (fibh.sbh != fibh.ebh)
791 brelse(fibh.ebh);
792 brelse(fibh.sbh);
793 brelse(epos.bh);
794 return 0;
795 }
796
797 if (cfi.lengthFileIdent &&
798 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
799 if (fibh.sbh != fibh.ebh)
800 brelse(fibh.ebh);
801 brelse(fibh.sbh);
802 brelse(epos.bh);
803 return 0;
804 }
805 }
806
807 if (fibh.sbh != fibh.ebh)
808 brelse(fibh.ebh);
809 brelse(fibh.sbh);
810 brelse(epos.bh);
811
812 return 1;
813 }
814
815 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
816 {
817 int retval;
818 struct inode *inode = d_inode(dentry);
819 struct udf_fileident_bh fibh;
820 struct fileIdentDesc *fi, cfi;
821 struct kernel_lb_addr tloc;
822
823 retval = -ENOENT;
824 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
825 if (IS_ERR_OR_NULL(fi)) {
826 if (fi)
827 retval = PTR_ERR(fi);
828 goto out;
829 }
830
831 retval = -EIO;
832 tloc = lelb_to_cpu(cfi.icb.extLocation);
833 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
834 goto end_rmdir;
835 retval = -ENOTEMPTY;
836 if (!empty_dir(inode))
837 goto end_rmdir;
838 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
839 if (retval)
840 goto end_rmdir;
841 if (inode->i_nlink != 2)
842 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
843 inode->i_nlink);
844 clear_nlink(inode);
845 inode->i_size = 0;
846 inode_dec_link_count(dir);
847 inode->i_ctime = dir->i_ctime = dir->i_mtime =
848 current_fs_time(dir->i_sb);
849 mark_inode_dirty(dir);
850
851 end_rmdir:
852 if (fibh.sbh != fibh.ebh)
853 brelse(fibh.ebh);
854 brelse(fibh.sbh);
855
856 out:
857 return retval;
858 }
859
860 static int udf_unlink(struct inode *dir, struct dentry *dentry)
861 {
862 int retval;
863 struct inode *inode = d_inode(dentry);
864 struct udf_fileident_bh fibh;
865 struct fileIdentDesc *fi;
866 struct fileIdentDesc cfi;
867 struct kernel_lb_addr tloc;
868
869 retval = -ENOENT;
870 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
871
872 if (IS_ERR_OR_NULL(fi)) {
873 if (fi)
874 retval = PTR_ERR(fi);
875 goto out;
876 }
877
878 retval = -EIO;
879 tloc = lelb_to_cpu(cfi.icb.extLocation);
880 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
881 goto end_unlink;
882
883 if (!inode->i_nlink) {
884 udf_debug("Deleting nonexistent file (%lu), %d\n",
885 inode->i_ino, inode->i_nlink);
886 set_nlink(inode, 1);
887 }
888 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
889 if (retval)
890 goto end_unlink;
891 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
892 mark_inode_dirty(dir);
893 inode_dec_link_count(inode);
894 inode->i_ctime = dir->i_ctime;
895 retval = 0;
896
897 end_unlink:
898 if (fibh.sbh != fibh.ebh)
899 brelse(fibh.ebh);
900 brelse(fibh.sbh);
901
902 out:
903 return retval;
904 }
905
906 static int udf_symlink(struct inode *dir, struct dentry *dentry,
907 const char *symname)
908 {
909 struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO);
910 struct pathComponent *pc;
911 const char *compstart;
912 struct extent_position epos = {};
913 int eoffset, elen = 0;
914 uint8_t *ea;
915 int err;
916 int block;
917 unsigned char *name = NULL;
918 int namelen;
919 struct udf_inode_info *iinfo;
920 struct super_block *sb = dir->i_sb;
921
922 if (IS_ERR(inode))
923 return PTR_ERR(inode);
924
925 iinfo = UDF_I(inode);
926 down_write(&iinfo->i_data_sem);
927 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
928 if (!name) {
929 err = -ENOMEM;
930 goto out_no_entry;
931 }
932
933 inode->i_data.a_ops = &udf_symlink_aops;
934 inode->i_op = &page_symlink_inode_operations;
935 inode_nohighmem(inode);
936
937 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
938 struct kernel_lb_addr eloc;
939 uint32_t bsize;
940
941 block = udf_new_block(sb, inode,
942 iinfo->i_location.partitionReferenceNum,
943 iinfo->i_location.logicalBlockNum, &err);
944 if (!block)
945 goto out_no_entry;
946 epos.block = iinfo->i_location;
947 epos.offset = udf_file_entry_alloc_offset(inode);
948 epos.bh = NULL;
949 eloc.logicalBlockNum = block;
950 eloc.partitionReferenceNum =
951 iinfo->i_location.partitionReferenceNum;
952 bsize = sb->s_blocksize;
953 iinfo->i_lenExtents = bsize;
954 udf_add_aext(inode, &epos, &eloc, bsize, 0);
955 brelse(epos.bh);
956
957 block = udf_get_pblock(sb, block,
958 iinfo->i_location.partitionReferenceNum,
959 0);
960 epos.bh = udf_tgetblk(sb, block);
961 lock_buffer(epos.bh);
962 memset(epos.bh->b_data, 0x00, bsize);
963 set_buffer_uptodate(epos.bh);
964 unlock_buffer(epos.bh);
965 mark_buffer_dirty_inode(epos.bh, inode);
966 ea = epos.bh->b_data + udf_ext0_offset(inode);
967 } else
968 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
969
970 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
971 pc = (struct pathComponent *)ea;
972
973 if (*symname == '/') {
974 do {
975 symname++;
976 } while (*symname == '/');
977
978 pc->componentType = 1;
979 pc->lengthComponentIdent = 0;
980 pc->componentFileVersionNum = 0;
981 elen += sizeof(struct pathComponent);
982 }
983
984 err = -ENAMETOOLONG;
985
986 while (*symname) {
987 if (elen + sizeof(struct pathComponent) > eoffset)
988 goto out_no_entry;
989
990 pc = (struct pathComponent *)(ea + elen);
991
992 compstart = symname;
993
994 do {
995 symname++;
996 } while (*symname && *symname != '/');
997
998 pc->componentType = 5;
999 pc->lengthComponentIdent = 0;
1000 pc->componentFileVersionNum = 0;
1001 if (compstart[0] == '.') {
1002 if ((symname - compstart) == 1)
1003 pc->componentType = 4;
1004 else if ((symname - compstart) == 2 &&
1005 compstart[1] == '.')
1006 pc->componentType = 3;
1007 }
1008
1009 if (pc->componentType == 5) {
1010 namelen = udf_put_filename(sb, compstart,
1011 symname - compstart,
1012 name, UDF_NAME_LEN_CS0);
1013 if (!namelen)
1014 goto out_no_entry;
1015
1016 if (elen + sizeof(struct pathComponent) + namelen >
1017 eoffset)
1018 goto out_no_entry;
1019 else
1020 pc->lengthComponentIdent = namelen;
1021
1022 memcpy(pc->componentIdent, name, namelen);
1023 }
1024
1025 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1026
1027 if (*symname) {
1028 do {
1029 symname++;
1030 } while (*symname == '/');
1031 }
1032 }
1033
1034 brelse(epos.bh);
1035 inode->i_size = elen;
1036 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1037 iinfo->i_lenAlloc = inode->i_size;
1038 else
1039 udf_truncate_tail_extent(inode);
1040 mark_inode_dirty(inode);
1041 up_write(&iinfo->i_data_sem);
1042
1043 err = udf_add_nondir(dentry, inode);
1044 out:
1045 kfree(name);
1046 return err;
1047
1048 out_no_entry:
1049 up_write(&iinfo->i_data_sem);
1050 inode_dec_link_count(inode);
1051 unlock_new_inode(inode);
1052 iput(inode);
1053 goto out;
1054 }
1055
1056 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1057 struct dentry *dentry)
1058 {
1059 struct inode *inode = d_inode(old_dentry);
1060 struct udf_fileident_bh fibh;
1061 struct fileIdentDesc cfi, *fi;
1062 int err;
1063
1064 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1065 if (!fi) {
1066 return err;
1067 }
1068 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1069 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1070 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1071 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1072 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1073 }
1074 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1075 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1076 mark_inode_dirty(dir);
1077
1078 if (fibh.sbh != fibh.ebh)
1079 brelse(fibh.ebh);
1080 brelse(fibh.sbh);
1081 inc_nlink(inode);
1082 inode->i_ctime = current_fs_time(inode->i_sb);
1083 mark_inode_dirty(inode);
1084 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
1085 mark_inode_dirty(dir);
1086 ihold(inode);
1087 d_instantiate(dentry, inode);
1088
1089 return 0;
1090 }
1091
1092 /* Anybody can rename anything with this: the permission checks are left to the
1093 * higher-level routines.
1094 */
1095 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1096 struct inode *new_dir, struct dentry *new_dentry)
1097 {
1098 struct inode *old_inode = d_inode(old_dentry);
1099 struct inode *new_inode = d_inode(new_dentry);
1100 struct udf_fileident_bh ofibh, nfibh;
1101 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1102 struct fileIdentDesc ocfi, ncfi;
1103 struct buffer_head *dir_bh = NULL;
1104 int retval = -ENOENT;
1105 struct kernel_lb_addr tloc;
1106 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1107
1108 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1109 if (IS_ERR(ofi)) {
1110 retval = PTR_ERR(ofi);
1111 goto end_rename;
1112 }
1113
1114 if (ofibh.sbh != ofibh.ebh)
1115 brelse(ofibh.ebh);
1116
1117 brelse(ofibh.sbh);
1118 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1119 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1120 != old_inode->i_ino)
1121 goto end_rename;
1122
1123 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1124 if (IS_ERR(nfi)) {
1125 retval = PTR_ERR(nfi);
1126 goto end_rename;
1127 }
1128 if (nfi && !new_inode) {
1129 if (nfibh.sbh != nfibh.ebh)
1130 brelse(nfibh.ebh);
1131 brelse(nfibh.sbh);
1132 nfi = NULL;
1133 }
1134 if (S_ISDIR(old_inode->i_mode)) {
1135 int offset = udf_ext0_offset(old_inode);
1136
1137 if (new_inode) {
1138 retval = -ENOTEMPTY;
1139 if (!empty_dir(new_inode))
1140 goto end_rename;
1141 }
1142 retval = -EIO;
1143 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1144 dir_fi = udf_get_fileident(
1145 old_iinfo->i_ext.i_data -
1146 (old_iinfo->i_efe ?
1147 sizeof(struct extendedFileEntry) :
1148 sizeof(struct fileEntry)),
1149 old_inode->i_sb->s_blocksize, &offset);
1150 } else {
1151 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1152 if (!dir_bh)
1153 goto end_rename;
1154 dir_fi = udf_get_fileident(dir_bh->b_data,
1155 old_inode->i_sb->s_blocksize, &offset);
1156 }
1157 if (!dir_fi)
1158 goto end_rename;
1159 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1160 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1161 old_dir->i_ino)
1162 goto end_rename;
1163 }
1164 if (!nfi) {
1165 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1166 &retval);
1167 if (!nfi)
1168 goto end_rename;
1169 }
1170
1171 /*
1172 * Like most other Unix systems, set the ctime for inodes on a
1173 * rename.
1174 */
1175 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1176 mark_inode_dirty(old_inode);
1177
1178 /*
1179 * ok, that's it
1180 */
1181 ncfi.fileVersionNum = ocfi.fileVersionNum;
1182 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1183 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1184 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1185
1186 /* The old fid may have moved - find it again */
1187 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1188 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1189
1190 if (new_inode) {
1191 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1192 inode_dec_link_count(new_inode);
1193 }
1194 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1195 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1196 mark_inode_dirty(old_dir);
1197 mark_inode_dirty(new_dir);
1198
1199 if (dir_fi) {
1200 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1201 udf_update_tag((char *)dir_fi,
1202 (sizeof(struct fileIdentDesc) +
1203 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1204 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1205 mark_inode_dirty(old_inode);
1206 else
1207 mark_buffer_dirty_inode(dir_bh, old_inode);
1208
1209 inode_dec_link_count(old_dir);
1210 if (new_inode)
1211 inode_dec_link_count(new_inode);
1212 else {
1213 inc_nlink(new_dir);
1214 mark_inode_dirty(new_dir);
1215 }
1216 }
1217
1218 if (ofi) {
1219 if (ofibh.sbh != ofibh.ebh)
1220 brelse(ofibh.ebh);
1221 brelse(ofibh.sbh);
1222 }
1223
1224 retval = 0;
1225
1226 end_rename:
1227 brelse(dir_bh);
1228 if (nfi) {
1229 if (nfibh.sbh != nfibh.ebh)
1230 brelse(nfibh.ebh);
1231 brelse(nfibh.sbh);
1232 }
1233
1234 return retval;
1235 }
1236
1237 static struct dentry *udf_get_parent(struct dentry *child)
1238 {
1239 struct kernel_lb_addr tloc;
1240 struct inode *inode = NULL;
1241 struct qstr dotdot = QSTR_INIT("..", 2);
1242 struct fileIdentDesc cfi;
1243 struct udf_fileident_bh fibh;
1244
1245 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1246 return ERR_PTR(-EACCES);
1247
1248 if (fibh.sbh != fibh.ebh)
1249 brelse(fibh.ebh);
1250 brelse(fibh.sbh);
1251
1252 tloc = lelb_to_cpu(cfi.icb.extLocation);
1253 inode = udf_iget(d_inode(child)->i_sb, &tloc);
1254 if (IS_ERR(inode))
1255 return ERR_CAST(inode);
1256
1257 return d_obtain_alias(inode);
1258 }
1259
1260
1261 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1262 u16 partref, __u32 generation)
1263 {
1264 struct inode *inode;
1265 struct kernel_lb_addr loc;
1266
1267 if (block == 0)
1268 return ERR_PTR(-ESTALE);
1269
1270 loc.logicalBlockNum = block;
1271 loc.partitionReferenceNum = partref;
1272 inode = udf_iget(sb, &loc);
1273
1274 if (IS_ERR(inode))
1275 return ERR_CAST(inode);
1276
1277 if (generation && inode->i_generation != generation) {
1278 iput(inode);
1279 return ERR_PTR(-ESTALE);
1280 }
1281 return d_obtain_alias(inode);
1282 }
1283
1284 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1285 struct fid *fid, int fh_len, int fh_type)
1286 {
1287 if (fh_len < 3 ||
1288 (fh_type != FILEID_UDF_WITH_PARENT &&
1289 fh_type != FILEID_UDF_WITHOUT_PARENT))
1290 return NULL;
1291
1292 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1293 fid->udf.generation);
1294 }
1295
1296 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1297 struct fid *fid, int fh_len, int fh_type)
1298 {
1299 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1300 return NULL;
1301
1302 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1303 fid->udf.parent_partref,
1304 fid->udf.parent_generation);
1305 }
1306 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1307 struct inode *parent)
1308 {
1309 int len = *lenp;
1310 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1311 struct fid *fid = (struct fid *)fh;
1312 int type = FILEID_UDF_WITHOUT_PARENT;
1313
1314 if (parent && (len < 5)) {
1315 *lenp = 5;
1316 return FILEID_INVALID;
1317 } else if (len < 3) {
1318 *lenp = 3;
1319 return FILEID_INVALID;
1320 }
1321
1322 *lenp = 3;
1323 fid->udf.block = location.logicalBlockNum;
1324 fid->udf.partref = location.partitionReferenceNum;
1325 fid->udf.parent_partref = 0;
1326 fid->udf.generation = inode->i_generation;
1327
1328 if (parent) {
1329 location = UDF_I(parent)->i_location;
1330 fid->udf.parent_block = location.logicalBlockNum;
1331 fid->udf.parent_partref = location.partitionReferenceNum;
1332 fid->udf.parent_generation = inode->i_generation;
1333 *lenp = 5;
1334 type = FILEID_UDF_WITH_PARENT;
1335 }
1336
1337 return type;
1338 }
1339
1340 const struct export_operations udf_export_ops = {
1341 .encode_fh = udf_encode_fh,
1342 .fh_to_dentry = udf_fh_to_dentry,
1343 .fh_to_parent = udf_fh_to_parent,
1344 .get_parent = udf_get_parent,
1345 };
1346
1347 const struct inode_operations udf_dir_inode_operations = {
1348 .lookup = udf_lookup,
1349 .create = udf_create,
1350 .link = udf_link,
1351 .unlink = udf_unlink,
1352 .symlink = udf_symlink,
1353 .mkdir = udf_mkdir,
1354 .rmdir = udf_rmdir,
1355 .mknod = udf_mknod,
1356 .rename = udf_rename,
1357 .tmpfile = udf_tmpfile,
1358 };
Linux kernel - Deliverables
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