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Merge branch 'clk-shmobile-for-v4.4' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-zesty-kernel.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;
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 nameptr = fname;
240 memcpy(nameptr, fi->fileIdent + liu,
241 lfi - poffset);
242 memcpy(nameptr + lfi - poffset,
243 fibh->ebh->b_data, poffset);
244 }
245 }
246
247 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
248 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
249 continue;
250 }
251
252 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
253 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
254 continue;
255 }
256
257 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
258 isdotdot)
259 goto out_ok;
260
261 if (!lfi)
262 continue;
263
264 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
265 if (flen < 0) {
266 fi = ERR_PTR(flen);
267 goto out_err;
268 }
269
270 if (udf_match(flen, fname, child->len, child->name))
271 goto out_ok;
272 }
273
274 fi = NULL;
275 out_err:
276 if (fibh->sbh != fibh->ebh)
277 brelse(fibh->ebh);
278 brelse(fibh->sbh);
279 out_ok:
280 brelse(epos.bh);
281 kfree(fname);
282
283 return fi;
284 }
285
286 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
287 unsigned int flags)
288 {
289 struct inode *inode = NULL;
290 struct fileIdentDesc cfi;
291 struct udf_fileident_bh fibh;
292 struct fileIdentDesc *fi;
293
294 if (dentry->d_name.len > UDF_NAME_LEN - 2)
295 return ERR_PTR(-ENAMETOOLONG);
296
297 #ifdef UDF_RECOVERY
298 /* temporary shorthand for specifying files by inode number */
299 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
300 struct kernel_lb_addr lb = {
301 .logicalBlockNum = 0,
302 .partitionReferenceNum =
303 simple_strtoul(dentry->d_name.name + 3,
304 NULL, 0),
305 };
306 inode = udf_iget(dir->i_sb, lb);
307 if (IS_ERR(inode))
308 return inode;
309 } else
310 #endif /* UDF_RECOVERY */
311
312 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
313 if (IS_ERR(fi))
314 return ERR_CAST(fi);
315
316 if (fi) {
317 struct kernel_lb_addr loc;
318
319 if (fibh.sbh != fibh.ebh)
320 brelse(fibh.ebh);
321 brelse(fibh.sbh);
322
323 loc = lelb_to_cpu(cfi.icb.extLocation);
324 inode = udf_iget(dir->i_sb, &loc);
325 if (IS_ERR(inode))
326 return ERR_CAST(inode);
327 }
328
329 return d_splice_alias(inode, dentry);
330 }
331
332 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
333 struct dentry *dentry,
334 struct udf_fileident_bh *fibh,
335 struct fileIdentDesc *cfi, int *err)
336 {
337 struct super_block *sb = dir->i_sb;
338 struct fileIdentDesc *fi = NULL;
339 unsigned char *name = NULL;
340 int namelen;
341 loff_t f_pos;
342 loff_t size = udf_ext0_offset(dir) + dir->i_size;
343 int nfidlen;
344 uint8_t lfi;
345 uint16_t liu;
346 int block;
347 struct kernel_lb_addr eloc;
348 uint32_t elen = 0;
349 sector_t offset;
350 struct extent_position epos = {};
351 struct udf_inode_info *dinfo;
352
353 fibh->sbh = fibh->ebh = NULL;
354 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
355 if (!name) {
356 *err = -ENOMEM;
357 goto out_err;
358 }
359
360 if (dentry) {
361 if (!dentry->d_name.len) {
362 *err = -EINVAL;
363 goto out_err;
364 }
365 namelen = udf_put_filename(sb, dentry->d_name.name, name,
366 dentry->d_name.len);
367 if (!namelen) {
368 *err = -ENAMETOOLONG;
369 goto out_err;
370 }
371 } else {
372 namelen = 0;
373 }
374
375 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
376
377 f_pos = udf_ext0_offset(dir);
378
379 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
380 dinfo = UDF_I(dir);
381 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
382 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
383 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
384 block = udf_get_lb_pblock(dir->i_sb,
385 &dinfo->i_location, 0);
386 fibh->soffset = fibh->eoffset = sb->s_blocksize;
387 goto add;
388 }
389 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
390 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
391 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
392 epos.offset -= sizeof(struct short_ad);
393 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
394 epos.offset -= sizeof(struct long_ad);
395 } else
396 offset = 0;
397
398 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
399 if (!fibh->sbh) {
400 *err = -EIO;
401 goto out_err;
402 }
403
404 block = dinfo->i_location.logicalBlockNum;
405 }
406
407 while (f_pos < size) {
408 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
409 &elen, &offset);
410
411 if (!fi) {
412 *err = -EIO;
413 goto out_err;
414 }
415
416 liu = le16_to_cpu(cfi->lengthOfImpUse);
417 lfi = cfi->lengthFileIdent;
418
419 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
420 if (((sizeof(struct fileIdentDesc) +
421 liu + lfi + 3) & ~3) == nfidlen) {
422 cfi->descTag.tagSerialNum = cpu_to_le16(1);
423 cfi->fileVersionNum = cpu_to_le16(1);
424 cfi->fileCharacteristics = 0;
425 cfi->lengthFileIdent = namelen;
426 cfi->lengthOfImpUse = cpu_to_le16(0);
427 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
428 name))
429 goto out_ok;
430 else {
431 *err = -EIO;
432 goto out_err;
433 }
434 }
435 }
436 }
437
438 add:
439 f_pos += nfidlen;
440
441 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
442 sb->s_blocksize - fibh->eoffset < nfidlen) {
443 brelse(epos.bh);
444 epos.bh = NULL;
445 fibh->soffset -= udf_ext0_offset(dir);
446 fibh->eoffset -= udf_ext0_offset(dir);
447 f_pos -= udf_ext0_offset(dir);
448 if (fibh->sbh != fibh->ebh)
449 brelse(fibh->ebh);
450 brelse(fibh->sbh);
451 fibh->sbh = fibh->ebh =
452 udf_expand_dir_adinicb(dir, &block, err);
453 if (!fibh->sbh)
454 goto out_err;
455 epos.block = dinfo->i_location;
456 epos.offset = udf_file_entry_alloc_offset(dir);
457 /* Load extent udf_expand_dir_adinicb() has created */
458 udf_current_aext(dir, &epos, &eloc, &elen, 1);
459 }
460
461 /* Entry fits into current block? */
462 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
463 fibh->soffset = fibh->eoffset;
464 fibh->eoffset += nfidlen;
465 if (fibh->sbh != fibh->ebh) {
466 brelse(fibh->sbh);
467 fibh->sbh = fibh->ebh;
468 }
469
470 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
471 block = dinfo->i_location.logicalBlockNum;
472 fi = (struct fileIdentDesc *)
473 (dinfo->i_ext.i_data +
474 fibh->soffset -
475 udf_ext0_offset(dir) +
476 dinfo->i_lenEAttr);
477 } else {
478 block = eloc.logicalBlockNum +
479 ((elen - 1) >>
480 dir->i_sb->s_blocksize_bits);
481 fi = (struct fileIdentDesc *)
482 (fibh->sbh->b_data + fibh->soffset);
483 }
484 } else {
485 /* Round up last extent in the file */
486 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
487 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
488 epos.offset -= sizeof(struct short_ad);
489 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
490 epos.offset -= sizeof(struct long_ad);
491 udf_write_aext(dir, &epos, &eloc, elen, 1);
492 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
493 - 1) & ~(sb->s_blocksize - 1);
494
495 fibh->soffset = fibh->eoffset - sb->s_blocksize;
496 fibh->eoffset += nfidlen - sb->s_blocksize;
497 if (fibh->sbh != fibh->ebh) {
498 brelse(fibh->sbh);
499 fibh->sbh = fibh->ebh;
500 }
501
502 block = eloc.logicalBlockNum + ((elen - 1) >>
503 dir->i_sb->s_blocksize_bits);
504 fibh->ebh = udf_bread(dir,
505 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
506 if (!fibh->ebh)
507 goto out_err;
508 /* Extents could have been merged, invalidate our position */
509 brelse(epos.bh);
510 epos.bh = NULL;
511 epos.block = dinfo->i_location;
512 epos.offset = udf_file_entry_alloc_offset(dir);
513
514 if (!fibh->soffset) {
515 /* Find the freshly allocated block */
516 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
517 (EXT_RECORDED_ALLOCATED >> 30))
518 ;
519 block = eloc.logicalBlockNum + ((elen - 1) >>
520 dir->i_sb->s_blocksize_bits);
521 brelse(fibh->sbh);
522 fibh->sbh = fibh->ebh;
523 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
524 } else {
525 fi = (struct fileIdentDesc *)
526 (fibh->sbh->b_data + sb->s_blocksize +
527 fibh->soffset);
528 }
529 }
530
531 memset(cfi, 0, sizeof(struct fileIdentDesc));
532 if (UDF_SB(sb)->s_udfrev >= 0x0200)
533 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
534 sizeof(struct tag));
535 else
536 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
537 sizeof(struct tag));
538 cfi->fileVersionNum = cpu_to_le16(1);
539 cfi->lengthFileIdent = namelen;
540 cfi->lengthOfImpUse = cpu_to_le16(0);
541 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
542 dir->i_size += nfidlen;
543 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
544 dinfo->i_lenAlloc += nfidlen;
545 else {
546 /* Find the last extent and truncate it to proper size */
547 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
548 (EXT_RECORDED_ALLOCATED >> 30))
549 ;
550 elen -= dinfo->i_lenExtents - dir->i_size;
551 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
552 epos.offset -= sizeof(struct short_ad);
553 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
554 epos.offset -= sizeof(struct long_ad);
555 udf_write_aext(dir, &epos, &eloc, elen, 1);
556 dinfo->i_lenExtents = dir->i_size;
557 }
558
559 mark_inode_dirty(dir);
560 goto out_ok;
561 } else {
562 *err = -EIO;
563 goto out_err;
564 }
565
566 out_err:
567 fi = NULL;
568 if (fibh->sbh != fibh->ebh)
569 brelse(fibh->ebh);
570 brelse(fibh->sbh);
571 out_ok:
572 brelse(epos.bh);
573 kfree(name);
574 return fi;
575 }
576
577 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
578 struct udf_fileident_bh *fibh,
579 struct fileIdentDesc *cfi)
580 {
581 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
582
583 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
584 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
585
586 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
587 }
588
589 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
590 {
591 struct udf_inode_info *iinfo = UDF_I(inode);
592 struct inode *dir = d_inode(dentry->d_parent);
593 struct udf_fileident_bh fibh;
594 struct fileIdentDesc cfi, *fi;
595 int err;
596
597 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
598 if (unlikely(!fi)) {
599 inode_dec_link_count(inode);
600 unlock_new_inode(inode);
601 iput(inode);
602 return err;
603 }
604 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
605 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
606 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
607 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
608 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
609 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
610 mark_inode_dirty(dir);
611 if (fibh.sbh != fibh.ebh)
612 brelse(fibh.ebh);
613 brelse(fibh.sbh);
614 unlock_new_inode(inode);
615 d_instantiate(dentry, inode);
616
617 return 0;
618 }
619
620 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
621 bool excl)
622 {
623 struct inode *inode = udf_new_inode(dir, mode);
624
625 if (IS_ERR(inode))
626 return PTR_ERR(inode);
627
628 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
629 inode->i_data.a_ops = &udf_adinicb_aops;
630 else
631 inode->i_data.a_ops = &udf_aops;
632 inode->i_op = &udf_file_inode_operations;
633 inode->i_fop = &udf_file_operations;
634 mark_inode_dirty(inode);
635
636 return udf_add_nondir(dentry, inode);
637 }
638
639 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
640 {
641 struct inode *inode = udf_new_inode(dir, mode);
642
643 if (IS_ERR(inode))
644 return PTR_ERR(inode);
645
646 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
647 inode->i_data.a_ops = &udf_adinicb_aops;
648 else
649 inode->i_data.a_ops = &udf_aops;
650 inode->i_op = &udf_file_inode_operations;
651 inode->i_fop = &udf_file_operations;
652 mark_inode_dirty(inode);
653 d_tmpfile(dentry, inode);
654 unlock_new_inode(inode);
655 return 0;
656 }
657
658 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
659 dev_t rdev)
660 {
661 struct inode *inode;
662
663 if (!old_valid_dev(rdev))
664 return -EINVAL;
665
666 inode = udf_new_inode(dir, mode);
667 if (IS_ERR(inode))
668 return PTR_ERR(inode);
669
670 init_special_inode(inode, mode, rdev);
671 return udf_add_nondir(dentry, inode);
672 }
673
674 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
675 {
676 struct inode *inode;
677 struct udf_fileident_bh fibh;
678 struct fileIdentDesc cfi, *fi;
679 int err;
680 struct udf_inode_info *dinfo = UDF_I(dir);
681 struct udf_inode_info *iinfo;
682
683 inode = udf_new_inode(dir, S_IFDIR | mode);
684 if (IS_ERR(inode))
685 return PTR_ERR(inode);
686
687 iinfo = UDF_I(inode);
688 inode->i_op = &udf_dir_inode_operations;
689 inode->i_fop = &udf_dir_operations;
690 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
691 if (!fi) {
692 inode_dec_link_count(inode);
693 unlock_new_inode(inode);
694 iput(inode);
695 goto out;
696 }
697 set_nlink(inode, 2);
698 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
699 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
700 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
701 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
702 cfi.fileCharacteristics =
703 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
704 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
705 brelse(fibh.sbh);
706 mark_inode_dirty(inode);
707
708 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
709 if (!fi) {
710 clear_nlink(inode);
711 mark_inode_dirty(inode);
712 unlock_new_inode(inode);
713 iput(inode);
714 goto out;
715 }
716 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
717 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
718 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
719 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
720 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
721 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
722 inc_nlink(dir);
723 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
724 mark_inode_dirty(dir);
725 unlock_new_inode(inode);
726 d_instantiate(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 int 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 (%d)\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_fs_time(dir->i_sb);
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), %d\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_fs_time(dir->i_sb);
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 | S_IRWXUGO);
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 int 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, 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
926 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
927 struct kernel_lb_addr eloc;
928 uint32_t bsize;
929
930 block = udf_new_block(sb, inode,
931 iinfo->i_location.partitionReferenceNum,
932 iinfo->i_location.logicalBlockNum, &err);
933 if (!block)
934 goto out_no_entry;
935 epos.block = iinfo->i_location;
936 epos.offset = udf_file_entry_alloc_offset(inode);
937 epos.bh = NULL;
938 eloc.logicalBlockNum = block;
939 eloc.partitionReferenceNum =
940 iinfo->i_location.partitionReferenceNum;
941 bsize = sb->s_blocksize;
942 iinfo->i_lenExtents = bsize;
943 udf_add_aext(inode, &epos, &eloc, bsize, 0);
944 brelse(epos.bh);
945
946 block = udf_get_pblock(sb, block,
947 iinfo->i_location.partitionReferenceNum,
948 0);
949 epos.bh = udf_tgetblk(sb, block);
950 lock_buffer(epos.bh);
951 memset(epos.bh->b_data, 0x00, bsize);
952 set_buffer_uptodate(epos.bh);
953 unlock_buffer(epos.bh);
954 mark_buffer_dirty_inode(epos.bh, inode);
955 ea = epos.bh->b_data + udf_ext0_offset(inode);
956 } else
957 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
958
959 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
960 pc = (struct pathComponent *)ea;
961
962 if (*symname == '/') {
963 do {
964 symname++;
965 } while (*symname == '/');
966
967 pc->componentType = 1;
968 pc->lengthComponentIdent = 0;
969 pc->componentFileVersionNum = 0;
970 elen += sizeof(struct pathComponent);
971 }
972
973 err = -ENAMETOOLONG;
974
975 while (*symname) {
976 if (elen + sizeof(struct pathComponent) > eoffset)
977 goto out_no_entry;
978
979 pc = (struct pathComponent *)(ea + elen);
980
981 compstart = symname;
982
983 do {
984 symname++;
985 } while (*symname && *symname != '/');
986
987 pc->componentType = 5;
988 pc->lengthComponentIdent = 0;
989 pc->componentFileVersionNum = 0;
990 if (compstart[0] == '.') {
991 if ((symname - compstart) == 1)
992 pc->componentType = 4;
993 else if ((symname - compstart) == 2 &&
994 compstart[1] == '.')
995 pc->componentType = 3;
996 }
997
998 if (pc->componentType == 5) {
999 namelen = udf_put_filename(sb, compstart, name,
1000 symname - compstart);
1001 if (!namelen)
1002 goto out_no_entry;
1003
1004 if (elen + sizeof(struct pathComponent) + namelen >
1005 eoffset)
1006 goto out_no_entry;
1007 else
1008 pc->lengthComponentIdent = namelen;
1009
1010 memcpy(pc->componentIdent, name, namelen);
1011 }
1012
1013 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1014
1015 if (*symname) {
1016 do {
1017 symname++;
1018 } while (*symname == '/');
1019 }
1020 }
1021
1022 brelse(epos.bh);
1023 inode->i_size = elen;
1024 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1025 iinfo->i_lenAlloc = inode->i_size;
1026 else
1027 udf_truncate_tail_extent(inode);
1028 mark_inode_dirty(inode);
1029 up_write(&iinfo->i_data_sem);
1030
1031 err = udf_add_nondir(dentry, inode);
1032 out:
1033 kfree(name);
1034 return err;
1035
1036 out_no_entry:
1037 up_write(&iinfo->i_data_sem);
1038 inode_dec_link_count(inode);
1039 unlock_new_inode(inode);
1040 iput(inode);
1041 goto out;
1042 }
1043
1044 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1045 struct dentry *dentry)
1046 {
1047 struct inode *inode = d_inode(old_dentry);
1048 struct udf_fileident_bh fibh;
1049 struct fileIdentDesc cfi, *fi;
1050 int err;
1051
1052 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1053 if (!fi) {
1054 return err;
1055 }
1056 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1057 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1058 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1059 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1060 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1061 }
1062 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1063 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1064 mark_inode_dirty(dir);
1065
1066 if (fibh.sbh != fibh.ebh)
1067 brelse(fibh.ebh);
1068 brelse(fibh.sbh);
1069 inc_nlink(inode);
1070 inode->i_ctime = current_fs_time(inode->i_sb);
1071 mark_inode_dirty(inode);
1072 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
1073 mark_inode_dirty(dir);
1074 ihold(inode);
1075 d_instantiate(dentry, inode);
1076
1077 return 0;
1078 }
1079
1080 /* Anybody can rename anything with this: the permission checks are left to the
1081 * higher-level routines.
1082 */
1083 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1084 struct inode *new_dir, struct dentry *new_dentry)
1085 {
1086 struct inode *old_inode = d_inode(old_dentry);
1087 struct inode *new_inode = d_inode(new_dentry);
1088 struct udf_fileident_bh ofibh, nfibh;
1089 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1090 struct fileIdentDesc ocfi, ncfi;
1091 struct buffer_head *dir_bh = NULL;
1092 int retval = -ENOENT;
1093 struct kernel_lb_addr tloc;
1094 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1095
1096 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1097 if (IS_ERR(ofi)) {
1098 retval = PTR_ERR(ofi);
1099 goto end_rename;
1100 }
1101
1102 if (ofibh.sbh != ofibh.ebh)
1103 brelse(ofibh.ebh);
1104
1105 brelse(ofibh.sbh);
1106 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1107 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1108 != old_inode->i_ino)
1109 goto end_rename;
1110
1111 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1112 if (IS_ERR(nfi)) {
1113 retval = PTR_ERR(nfi);
1114 goto end_rename;
1115 }
1116 if (nfi && !new_inode) {
1117 if (nfibh.sbh != nfibh.ebh)
1118 brelse(nfibh.ebh);
1119 brelse(nfibh.sbh);
1120 nfi = NULL;
1121 }
1122 if (S_ISDIR(old_inode->i_mode)) {
1123 int offset = udf_ext0_offset(old_inode);
1124
1125 if (new_inode) {
1126 retval = -ENOTEMPTY;
1127 if (!empty_dir(new_inode))
1128 goto end_rename;
1129 }
1130 retval = -EIO;
1131 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1132 dir_fi = udf_get_fileident(
1133 old_iinfo->i_ext.i_data -
1134 (old_iinfo->i_efe ?
1135 sizeof(struct extendedFileEntry) :
1136 sizeof(struct fileEntry)),
1137 old_inode->i_sb->s_blocksize, &offset);
1138 } else {
1139 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1140 if (!dir_bh)
1141 goto end_rename;
1142 dir_fi = udf_get_fileident(dir_bh->b_data,
1143 old_inode->i_sb->s_blocksize, &offset);
1144 }
1145 if (!dir_fi)
1146 goto end_rename;
1147 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1148 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1149 old_dir->i_ino)
1150 goto end_rename;
1151 }
1152 if (!nfi) {
1153 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1154 &retval);
1155 if (!nfi)
1156 goto end_rename;
1157 }
1158
1159 /*
1160 * Like most other Unix systems, set the ctime for inodes on a
1161 * rename.
1162 */
1163 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1164 mark_inode_dirty(old_inode);
1165
1166 /*
1167 * ok, that's it
1168 */
1169 ncfi.fileVersionNum = ocfi.fileVersionNum;
1170 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1171 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1172 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1173
1174 /* The old fid may have moved - find it again */
1175 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1176 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1177
1178 if (new_inode) {
1179 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1180 inode_dec_link_count(new_inode);
1181 }
1182 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1183 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1184 mark_inode_dirty(old_dir);
1185 mark_inode_dirty(new_dir);
1186
1187 if (dir_fi) {
1188 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1189 udf_update_tag((char *)dir_fi,
1190 (sizeof(struct fileIdentDesc) +
1191 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1192 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1193 mark_inode_dirty(old_inode);
1194 else
1195 mark_buffer_dirty_inode(dir_bh, old_inode);
1196
1197 inode_dec_link_count(old_dir);
1198 if (new_inode)
1199 inode_dec_link_count(new_inode);
1200 else {
1201 inc_nlink(new_dir);
1202 mark_inode_dirty(new_dir);
1203 }
1204 }
1205
1206 if (ofi) {
1207 if (ofibh.sbh != ofibh.ebh)
1208 brelse(ofibh.ebh);
1209 brelse(ofibh.sbh);
1210 }
1211
1212 retval = 0;
1213
1214 end_rename:
1215 brelse(dir_bh);
1216 if (nfi) {
1217 if (nfibh.sbh != nfibh.ebh)
1218 brelse(nfibh.ebh);
1219 brelse(nfibh.sbh);
1220 }
1221
1222 return retval;
1223 }
1224
1225 static struct dentry *udf_get_parent(struct dentry *child)
1226 {
1227 struct kernel_lb_addr tloc;
1228 struct inode *inode = NULL;
1229 struct qstr dotdot = QSTR_INIT("..", 2);
1230 struct fileIdentDesc cfi;
1231 struct udf_fileident_bh fibh;
1232
1233 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1234 return ERR_PTR(-EACCES);
1235
1236 if (fibh.sbh != fibh.ebh)
1237 brelse(fibh.ebh);
1238 brelse(fibh.sbh);
1239
1240 tloc = lelb_to_cpu(cfi.icb.extLocation);
1241 inode = udf_iget(d_inode(child)->i_sb, &tloc);
1242 if (IS_ERR(inode))
1243 return ERR_CAST(inode);
1244
1245 return d_obtain_alias(inode);
1246 }
1247
1248
1249 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1250 u16 partref, __u32 generation)
1251 {
1252 struct inode *inode;
1253 struct kernel_lb_addr loc;
1254
1255 if (block == 0)
1256 return ERR_PTR(-ESTALE);
1257
1258 loc.logicalBlockNum = block;
1259 loc.partitionReferenceNum = partref;
1260 inode = udf_iget(sb, &loc);
1261
1262 if (IS_ERR(inode))
1263 return ERR_CAST(inode);
1264
1265 if (generation && inode->i_generation != generation) {
1266 iput(inode);
1267 return ERR_PTR(-ESTALE);
1268 }
1269 return d_obtain_alias(inode);
1270 }
1271
1272 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1273 struct fid *fid, int fh_len, int fh_type)
1274 {
1275 if (fh_len < 3 ||
1276 (fh_type != FILEID_UDF_WITH_PARENT &&
1277 fh_type != FILEID_UDF_WITHOUT_PARENT))
1278 return NULL;
1279
1280 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1281 fid->udf.generation);
1282 }
1283
1284 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1285 struct fid *fid, int fh_len, int fh_type)
1286 {
1287 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1288 return NULL;
1289
1290 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1291 fid->udf.parent_partref,
1292 fid->udf.parent_generation);
1293 }
1294 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1295 struct inode *parent)
1296 {
1297 int len = *lenp;
1298 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1299 struct fid *fid = (struct fid *)fh;
1300 int type = FILEID_UDF_WITHOUT_PARENT;
1301
1302 if (parent && (len < 5)) {
1303 *lenp = 5;
1304 return FILEID_INVALID;
1305 } else if (len < 3) {
1306 *lenp = 3;
1307 return FILEID_INVALID;
1308 }
1309
1310 *lenp = 3;
1311 fid->udf.block = location.logicalBlockNum;
1312 fid->udf.partref = location.partitionReferenceNum;
1313 fid->udf.parent_partref = 0;
1314 fid->udf.generation = inode->i_generation;
1315
1316 if (parent) {
1317 location = UDF_I(parent)->i_location;
1318 fid->udf.parent_block = location.logicalBlockNum;
1319 fid->udf.parent_partref = location.partitionReferenceNum;
1320 fid->udf.parent_generation = inode->i_generation;
1321 *lenp = 5;
1322 type = FILEID_UDF_WITH_PARENT;
1323 }
1324
1325 return type;
1326 }
1327
1328 const struct export_operations udf_export_ops = {
1329 .encode_fh = udf_encode_fh,
1330 .fh_to_dentry = udf_fh_to_dentry,
1331 .fh_to_parent = udf_fh_to_parent,
1332 .get_parent = udf_get_parent,
1333 };
1334
1335 const struct inode_operations udf_dir_inode_operations = {
1336 .lookup = udf_lookup,
1337 .create = udf_create,
1338 .link = udf_link,
1339 .unlink = udf_unlink,
1340 .symlink = udf_symlink,
1341 .mkdir = udf_mkdir,
1342 .rmdir = udf_rmdir,
1343 .mknod = udf_mknod,
1344 .rename = udf_rename,
1345 .tmpfile = udf_tmpfile,
1346 };
1347 const struct inode_operations udf_symlink_inode_operations = {
1348 .readlink = generic_readlink,
1349 .follow_link = page_follow_link_light,
1350 .put_link = page_put_link,
1351 };
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