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Fix "fs: convert core functions to zero_user_page"
[linux-2.6-block.git] / fs / udf / namei.c
CommitLineData
1da177e4
LT		 1/*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
6 *
1da177e4
LT		 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/quotaops.h>
31#include <linux/smp_lock.h>
32#include <linux/buffer_head.h>
33
34static inline int udf_match(int len1, const char *name1, int len2, const char *name2)
35{
36 if (len1 != len2)
37 return 0;
38 return !memcmp(name1, name2, len1);
39}
40
41int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
42 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
43 uint8_t *impuse, uint8_t *fileident)
44{
45 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
46 uint16_t crc;
47 uint8_t checksum = 0;
48 int i;
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_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
57 adinicb = 1;
58
59 offset = fibh->soffset + sizeof(struct fileIdentDesc);
60
61 if (impuse)
62 {
63 if (adinicb || (offset + liu < 0))
64 memcpy((uint8_t *)sfi->impUse, impuse, liu);
65 else if (offset >= 0)
66 memcpy(fibh->ebh->b_data + offset, impuse, liu);
67 else
68 {
69 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
70 memcpy(fibh->ebh->b_data, impuse - offset, liu + offset);
71 }
72 }
73
74 offset += liu;
75
76 if (fileident)
77 {
78 if (adinicb || (offset + lfi < 0))
79 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
80 else if (offset >= 0)
81 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
82 else
83 {
84 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset);
85 memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset);
86 }
87 }
88
89 offset += lfi;
90
91 if (adinicb || (offset + padlen < 0))
92 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
93 else if (offset >= 0)
94 memset(fibh->ebh->b_data + offset, 0x00, padlen);
95 else
96 {
97 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
98 memset(fibh->ebh->b_data, 0x00, padlen + offset);
99 }
100
101 crc = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) -
102 sizeof(tag), 0);
103
104 if (fibh->sbh == fibh->ebh)
105 crc = udf_crc((uint8_t *)sfi->impUse,
106 crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
107 else if (sizeof(struct fileIdentDesc) >= -fibh->soffset)
108 crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset,
109 crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
110 else
111 {
112 crc = udf_crc((uint8_t *)sfi->impUse,
113 -fibh->soffset - sizeof(struct fileIdentDesc), crc);
114 crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
115 }
116
117 cfi->descTag.descCRC = cpu_to_le16(crc);
118 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
119
120 for (i=0; i<16; i++)
121 if (i != 4)
122 checksum += ((uint8_t *)&cfi->descTag)[i];
123
124 cfi->descTag.tagChecksum = checksum;
125 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset))
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc));
127 else
128 {
129 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
130 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
131 sizeof(struct fileIdentDesc) + fibh->soffset);
132 }
133
134 if (adinicb)
135 mark_inode_dirty(inode);
136 else
137 {
138 if (fibh->sbh != fibh->ebh)
139 mark_buffer_dirty_inode(fibh->ebh, inode);
140 mark_buffer_dirty_inode(fibh->sbh, inode);
141 }
142 return 0;
143}
144
145static struct fileIdentDesc *
146udf_find_entry(struct inode *dir, struct dentry *dentry,
147 struct udf_fileident_bh *fibh,
148 struct fileIdentDesc *cfi)
149{
150 struct fileIdentDesc *fi=NULL;
151 loff_t f_pos;
152 int block, flen;
153 char fname[UDF_NAME_LEN];
154 char *nameptr;
155 uint8_t lfi;
156 uint16_t liu;
ec471dc4 157 loff_t size;
ff116fc8
JK		 158 kernel_lb_addr eloc;
159 uint32_t elen;
60448b1d 160 sector_t offset;
ff116fc8 161 struct extent_position epos = { NULL, 0, { 0, 0}};
1da177e4 162
ec471dc4 163 size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
1da177e4
LT		 164 f_pos = (udf_ext0_offset(dir) >> 2);
165
166 fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
167 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
168 fibh->sbh = fibh->ebh = NULL;
169 else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
ff116fc8 170 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
1da177e4 171 {
1da177e4
LT		 172 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
173 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
174 {
175 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
ff116fc8 176 epos.offset -= sizeof(short_ad);
1da177e4 177 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
ff116fc8 178 epos.offset -= sizeof(long_ad);
1da177e4
LT		 179 }
180 else
181 offset = 0;
182
183 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
184 {
3bf25cb4 185 brelse(epos.bh);
1da177e4
LT		 186 return NULL;
187 }
188 }
189 else
190 {
3bf25cb4 191 brelse(epos.bh);
1da177e4
LT		 192 return NULL;
193 }
194
195 while ( (f_pos < size) )
196 {
ff116fc8 197 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, &elen, &offset);
1da177e4
LT		 198
199 if (!fi)
200 {
201 if (fibh->sbh != fibh->ebh)
3bf25cb4
JK		 202 brelse(fibh->ebh);
203 brelse(fibh->sbh);
204 brelse(epos.bh);
1da177e4
LT		 205 return NULL;
206 }
207
208 liu = le16_to_cpu(cfi->lengthOfImpUse);
209 lfi = cfi->lengthFileIdent;
210
211 if (fibh->sbh == fibh->ebh)
212 {
213 nameptr = fi->fileIdent + liu;
214 }
215 else
216 {
217 int poffset; /* Unpaded ending offset */
218
219 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
220
221 if (poffset >= lfi)
222 nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
223 else
224 {
225 nameptr = fname;
226 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
227 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
228 }
229 }
230
231 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
232 {
233 if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
234 continue;
235 }
236
237 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
238 {
239 if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
240 continue;
241 }
242
243 if (!lfi)
244 continue;
245
246 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)))
247 {
248 if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
249 {
3bf25cb4 250 brelse(epos.bh);
1da177e4
LT		 251 return fi;
252 }
253 }
254 }
255 if (fibh->sbh != fibh->ebh)
3bf25cb4
JK		 256 brelse(fibh->ebh);
257 brelse(fibh->sbh);
258 brelse(epos.bh);
1da177e4
LT		 259 return NULL;
260}
261
262/*
263 * udf_lookup
264 *
265 * PURPOSE
266 * Look-up the inode for a given name.
267 *
268 * DESCRIPTION
269 * Required - lookup_dentry() will return -ENOTDIR if this routine is not
270 * available for a directory. The filesystem is useless if this routine is
271 * not available for at least the filesystem's root directory.
272 *
273 * This routine is passed an incomplete dentry - it must be completed by
274 * calling d_add(dentry, inode). If the name does not exist, then the
275 * specified inode must be set to null. An error should only be returned
276 * when the lookup fails for a reason other than the name not existing.
277 * Note that the directory inode semaphore is held during the call.
278 *
279 * Refer to lookup_dentry() in fs/namei.c
280 * lookup_dentry() -> lookup() -> real_lookup() -> .
281 *
282 * PRE-CONDITIONS
283 * dir Pointer to inode of parent directory.
284 * dentry Pointer to dentry to complete.
285 * nd Pointer to lookup nameidata
286 *
287 * POST-CONDITIONS
288 * <return> Zero on success.
289 *
290 * HISTORY
291 * July 1, 1997 - Andrew E. Mileski
292 * Written, tested, and released.
293 */
294
295static struct dentry *
296udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
297{
298 struct inode *inode = NULL;
db9a369e 299 struct fileIdentDesc cfi;
1da177e4
LT		 300 struct udf_fileident_bh fibh;
301
302 if (dentry->d_name.len > UDF_NAME_LEN-2)
303 return ERR_PTR(-ENAMETOOLONG);
304
305 lock_kernel();
306#ifdef UDF_RECOVERY
307 /* temporary shorthand for specifying files by inode number */
308 if (!strncmp(dentry->d_name.name, ".B=", 3) )
309 {
310 kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) };
311 inode = udf_iget(dir->i_sb, lb);
312 if (!inode)
313 {
314 unlock_kernel();
315 return ERR_PTR(-EACCES);
316 }
317 }
318 else
319#endif /* UDF_RECOVERY */
320
db9a369e 321 if (udf_find_entry(dir, dentry, &fibh, &cfi))
1da177e4
LT		 322 {
323 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 324 brelse(fibh.ebh);
325 brelse(fibh.sbh);
1da177e4
LT		 326
327 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
328 if ( !inode )
329 {
330 unlock_kernel();
331 return ERR_PTR(-EACCES);
332 }
333 }
334 unlock_kernel();
335 d_add(dentry, inode);
336 return NULL;
337}
338
339static struct fileIdentDesc *
340udf_add_entry(struct inode *dir, struct dentry *dentry,
341 struct udf_fileident_bh *fibh,
342 struct fileIdentDesc *cfi, int *err)
343{
344 struct super_block *sb;
345 struct fileIdentDesc *fi=NULL;
346 char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
347 int namelen;
348 loff_t f_pos;
349 int flen;
350 char *nameptr;
351 loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
352 int nfidlen;
353 uint8_t lfi;
354 uint16_t liu;
355 int block;
ff116fc8
JK		 356 kernel_lb_addr eloc;
357 uint32_t elen;
60448b1d 358 sector_t offset;
ff116fc8 359 struct extent_position epos = { NULL, 0, { 0, 0 }};
1da177e4
LT		 360
361 sb = dir->i_sb;
362
363 if (dentry)
364 {
365 if (!dentry->d_name.len)
366 {
367 *err = -EINVAL;
368 return NULL;
369 }
370
371 if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len)))
372 {
373 *err = -ENAMETOOLONG;
374 return NULL;
375 }
376 }
377 else
378 namelen = 0;
379
380 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
381
382 f_pos = (udf_ext0_offset(dir) >> 2);
383
384 fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
385 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
386 fibh->sbh = fibh->ebh = NULL;
387 else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
ff116fc8 388 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
1da177e4 389 {
1da177e4
LT		 390 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
391 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
392 {
393 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
ff116fc8 394 epos.offset -= sizeof(short_ad);
1da177e4 395 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
ff116fc8 396 epos.offset -= sizeof(long_ad);
1da177e4
LT		 397 }
398 else
399 offset = 0;
400
401 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
402 {
3bf25cb4 403 brelse(epos.bh);
1da177e4
LT		 404 *err = -EIO;
405 return NULL;
406 }
407
408 block = UDF_I_LOCATION(dir).logicalBlockNum;
409
410 }
411 else
412 {
413 block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
414 fibh->sbh = fibh->ebh = NULL;
415 fibh->soffset = fibh->eoffset = sb->s_blocksize;
416 goto add;
417 }
418
419 while ( (f_pos < size) )
420 {
ff116fc8 421 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, &elen, &offset);
1da177e4
LT		 422
423 if (!fi)
424 {
425 if (fibh->sbh != fibh->ebh)
3bf25cb4
JK		 426 brelse(fibh->ebh);
427 brelse(fibh->sbh);
428 brelse(epos.bh);
1da177e4
LT		 429 *err = -EIO;
430 return NULL;
431 }
432
433 liu = le16_to_cpu(cfi->lengthOfImpUse);
434 lfi = cfi->lengthFileIdent;
435
436 if (fibh->sbh == fibh->ebh)
437 nameptr = fi->fileIdent + liu;
438 else
439 {
440 int poffset; /* Unpaded ending offset */
441
442 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
443
444 if (poffset >= lfi)
445 nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
446 else
447 {
448 nameptr = fname;
449 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
450 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
451 }
452 }
453
454 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
455 {
456 if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen)
457 {
3bf25cb4 458 brelse(epos.bh);
1da177e4
LT		 459 cfi->descTag.tagSerialNum = cpu_to_le16(1);
460 cfi->fileVersionNum = cpu_to_le16(1);
461 cfi->fileCharacteristics = 0;
462 cfi->lengthFileIdent = namelen;
463 cfi->lengthOfImpUse = cpu_to_le16(0);
464 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
465 return fi;
466 else
467 {
468 *err = -EIO;
469 return NULL;
470 }
471 }
472 }
473
474 if (!lfi || !dentry)
475 continue;
476
477 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
478 udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
479 {
480 if (fibh->sbh != fibh->ebh)
3bf25cb4
JK		 481 brelse(fibh->ebh);
482 brelse(fibh->sbh);
483 brelse(epos.bh);
1da177e4
LT		 484 *err = -EEXIST;
485 return NULL;
486 }
487 }
488
489add:
490 f_pos += nfidlen;
491
492 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
493 sb->s_blocksize - fibh->eoffset < nfidlen)
494 {
3bf25cb4 495 brelse(epos.bh);
ff116fc8 496 epos.bh = NULL;
1da177e4
LT		 497 fibh->soffset -= udf_ext0_offset(dir);
498 fibh->eoffset -= udf_ext0_offset(dir);
499 f_pos -= (udf_ext0_offset(dir) >> 2);
500 if (fibh->sbh != fibh->ebh)
3bf25cb4
JK		 501 brelse(fibh->ebh);
502 brelse(fibh->sbh);
1da177e4
LT		 503 if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
504 return NULL;
ff116fc8 505 epos.block = UDF_I_LOCATION(dir);
1da177e4
LT		 506 eloc.logicalBlockNum = block;
507 eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
508 elen = dir->i_sb->s_blocksize;
ff116fc8 509 epos.offset = udf_file_entry_alloc_offset(dir);
1da177e4 510 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
ff116fc8 511 epos.offset += sizeof(short_ad);
1da177e4 512 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
ff116fc8 513 epos.offset += sizeof(long_ad);
1da177e4
LT		 514 }
515
516 if (sb->s_blocksize - fibh->eoffset >= nfidlen)
517 {
518 fibh->soffset = fibh->eoffset;
519 fibh->eoffset += nfidlen;
520 if (fibh->sbh != fibh->ebh)
521 {
3bf25cb4 522 brelse(fibh->sbh);
1da177e4
LT		 523 fibh->sbh = fibh->ebh;
524 }
525
526 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
527 {
528 block = UDF_I_LOCATION(dir).logicalBlockNum;
529 fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir));
530 }
531 else
532 {
533 block = eloc.logicalBlockNum + ((elen - 1) >>
534 dir->i_sb->s_blocksize_bits);
535 fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
536 }
537 }
538 else
539 {
540 fibh->soffset = fibh->eoffset - sb->s_blocksize;
541 fibh->eoffset += nfidlen - sb->s_blocksize;
542 if (fibh->sbh != fibh->ebh)
543 {
3bf25cb4 544 brelse(fibh->sbh);
1da177e4
LT		 545 fibh->sbh = fibh->ebh;
546 }
547
548 block = eloc.logicalBlockNum + ((elen - 1) >>
549 dir->i_sb->s_blocksize_bits);
550
551 if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err)))
552 {
3bf25cb4
JK		 553 brelse(epos.bh);
554 brelse(fibh->sbh);
1da177e4
LT		 555 return NULL;
556 }
557
558 if (!(fibh->soffset))
559 {
ff116fc8 560 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
1da177e4
LT		 561 (EXT_RECORDED_ALLOCATED >> 30))
562 {
563 block = eloc.logicalBlockNum + ((elen - 1) >>
564 dir->i_sb->s_blocksize_bits);
565 }
566 else
567 block ++;
568
3bf25cb4 569 brelse(fibh->sbh);
1da177e4
LT		 570 fibh->sbh = fibh->ebh;
571 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
572 }
573 else
574 {
575 fi = (struct fileIdentDesc *)
576 (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
577 }
578 }
579
580 memset(cfi, 0, sizeof(struct fileIdentDesc));
581 if (UDF_SB_UDFREV(sb) >= 0x0200)
582 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
583 else
584 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
585 cfi->fileVersionNum = cpu_to_le16(1);
586 cfi->lengthFileIdent = namelen;
587 cfi->lengthOfImpUse = cpu_to_le16(0);
588 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
589 {
3bf25cb4 590 brelse(epos.bh);
1da177e4
LT		 591 dir->i_size += nfidlen;
592 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
593 UDF_I_LENALLOC(dir) += nfidlen;
594 mark_inode_dirty(dir);
595 return fi;
596 }
597 else
598 {
3bf25cb4 599 brelse(epos.bh);
1da177e4 600 if (fibh->sbh != fibh->ebh)
3bf25cb4
JK		 601 brelse(fibh->ebh);
602 brelse(fibh->sbh);
1da177e4
LT		 603 *err = -EIO;
604 return NULL;
605 }
606}
607
608static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
609 struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi)
610{
611 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
612 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
613 memset(&(cfi->icb), 0x00, sizeof(long_ad));
614 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
615}
616
617static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
618{
619 struct udf_fileident_bh fibh;
620 struct inode *inode;
621 struct fileIdentDesc cfi, *fi;
622 int err;
623
624 lock_kernel();
625 inode = udf_new_inode(dir, mode, &err);
626 if (!inode)
627 {
628 unlock_kernel();
629 return err;
630 }
631
632 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
633 inode->i_data.a_ops = &udf_adinicb_aops;
634 else
635 inode->i_data.a_ops = &udf_aops;
636 inode->i_op = &udf_file_inode_operations;
637 inode->i_fop = &udf_file_operations;
638 inode->i_mode = mode;
639 mark_inode_dirty(inode);
640
641 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
642 {
643 inode->i_nlink --;
644 mark_inode_dirty(inode);
645 iput(inode);
646 unlock_kernel();
647 return err;
648 }
649 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
650 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
651 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
652 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
653 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
654 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
655 {
656 mark_inode_dirty(dir);
657 }
658 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 659 brelse(fibh.ebh);
660 brelse(fibh.sbh);
1da177e4
LT		 661 unlock_kernel();
662 d_instantiate(dentry, inode);
663 return 0;
664}
665
666static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev)
667{
668 struct inode * inode;
669 struct udf_fileident_bh fibh;
670 struct fileIdentDesc cfi, *fi;
671 int err;
672
673 if (!old_valid_dev(rdev))
674 return -EINVAL;
675
676 lock_kernel();
677 err = -EIO;
678 inode = udf_new_inode(dir, mode, &err);
679 if (!inode)
680 goto out;
681
682 inode->i_uid = current->fsuid;
683 init_special_inode(inode, mode, rdev);
684 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
685 {
686 inode->i_nlink --;
687 mark_inode_dirty(inode);
688 iput(inode);
689 unlock_kernel();
690 return err;
691 }
692 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
693 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
694 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
695 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
696 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
697 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
698 {
699 mark_inode_dirty(dir);
700 }
701 mark_inode_dirty(inode);
702
703 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 704 brelse(fibh.ebh);
705 brelse(fibh.sbh);
1da177e4
LT		 706 d_instantiate(dentry, inode);
707 err = 0;
708out:
709 unlock_kernel();
710 return err;
711}
712
713static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode)
714{
715 struct inode * inode;
716 struct udf_fileident_bh fibh;
717 struct fileIdentDesc cfi, *fi;
718 int err;
719
720 lock_kernel();
721 err = -EMLINK;
722 if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1)
723 goto out;
724
725 err = -EIO;
726 inode = udf_new_inode(dir, S_IFDIR, &err);
727 if (!inode)
728 goto out;
729
730 inode->i_op = &udf_dir_inode_operations;
731 inode->i_fop = &udf_dir_operations;
732 if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err)))
733 {
734 inode->i_nlink--;
735 mark_inode_dirty(inode);
736 iput(inode);
737 goto out;
738 }
739 inode->i_nlink = 2;
740 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
741 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
742 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
743 cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
744 cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
745 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
3bf25cb4 746 brelse(fibh.sbh);
1da177e4
LT		 747 inode->i_mode = S_IFDIR | mode;
748 if (dir->i_mode & S_ISGID)
749 inode->i_mode |= S_ISGID;
750 mark_inode_dirty(inode);
751
752 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
753 {
754 inode->i_nlink = 0;
755 mark_inode_dirty(inode);
756 iput(inode);
757 goto out;
758 }
759 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
760 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
761 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
762 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
763 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
764 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
d8c76e6f 765 inc_nlink(dir);
1da177e4
LT		 766 mark_inode_dirty(dir);
767 d_instantiate(dentry, inode);
768 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 769 brelse(fibh.ebh);
770 brelse(fibh.sbh);
1da177e4
LT		 771 err = 0;
772out:
773 unlock_kernel();
774 return err;
775}
776
777static int empty_dir(struct inode *dir)
778{
779 struct fileIdentDesc *fi, cfi;
780 struct udf_fileident_bh fibh;
781 loff_t f_pos;
782 loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
783 int block;
ff116fc8
JK		 784 kernel_lb_addr eloc;
785 uint32_t elen;
60448b1d 786 sector_t offset;
ff116fc8 787 struct extent_position epos = { NULL, 0, { 0, 0}};
1da177e4
LT		 788
789 f_pos = (udf_ext0_offset(dir) >> 2);
790
791 fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
792
793 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
794 fibh.sbh = fibh.ebh = NULL;
795 else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
ff116fc8 796 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
1da177e4 797 {
1da177e4
LT		 798 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
799 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
800 {
801 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
ff116fc8 802 epos.offset -= sizeof(short_ad);
1da177e4 803 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
ff116fc8 804 epos.offset -= sizeof(long_ad);
1da177e4
LT		 805 }
806 else
807 offset = 0;
808
809 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
810 {
3bf25cb4 811 brelse(epos.bh);
1da177e4
LT		 812 return 0;
813 }
814 }
815 else
816 {
3bf25cb4 817 brelse(epos.bh);
1da177e4
LT		 818 return 0;
819 }
820
821
822 while ( (f_pos < size) )
823 {
ff116fc8 824 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, &elen, &offset);
1da177e4
LT		 825
826 if (!fi)
827 {
828 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 829 brelse(fibh.ebh);
830 brelse(fibh.sbh);
831 brelse(epos.bh);
1da177e4
LT		 832 return 0;
833 }
834
835 if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0)
836 {
837 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 838 brelse(fibh.ebh);
839 brelse(fibh.sbh);
840 brelse(epos.bh);
1da177e4
LT		 841 return 0;
842 }
843 }
844 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 845 brelse(fibh.ebh);
846 brelse(fibh.sbh);
847 brelse(epos.bh);
1da177e4
LT		 848 return 1;
849}
850
851static int udf_rmdir(struct inode * dir, struct dentry * dentry)
852{
853 int retval;
854 struct inode * inode = dentry->d_inode;
855 struct udf_fileident_bh fibh;
856 struct fileIdentDesc *fi, cfi;
857 kernel_lb_addr tloc;
858
859 retval = -ENOENT;
860 lock_kernel();
861 fi = udf_find_entry(dir, dentry, &fibh, &cfi);
862 if (!fi)
863 goto out;
864
865 retval = -EIO;
866 tloc = lelb_to_cpu(cfi.icb.extLocation);
867 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
868 goto end_rmdir;
869 retval = -ENOTEMPTY;
870 if (!empty_dir(inode))
871 goto end_rmdir;
872 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
873 if (retval)
874 goto end_rmdir;
875 if (inode->i_nlink != 2)
876 udf_warning(inode->i_sb, "udf_rmdir",
877 "empty directory has nlink != 2 (%d)",
878 inode->i_nlink);
ce71ec36 879 clear_nlink(inode);
1da177e4 880 inode->i_size = 0;
c007c06e 881 inode_dec_link_count(dir);
1da177e4
LT		 882 inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
883 mark_inode_dirty(dir);
884
885end_rmdir:
886 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 887 brelse(fibh.ebh);
888 brelse(fibh.sbh);
1da177e4
LT		 889out:
890 unlock_kernel();
891 return retval;
892}
893
894static int udf_unlink(struct inode * dir, struct dentry * dentry)
895{
896 int retval;
897 struct inode * inode = dentry->d_inode;
898 struct udf_fileident_bh fibh;
899 struct fileIdentDesc *fi;
900 struct fileIdentDesc cfi;
901 kernel_lb_addr tloc;
902
903 retval = -ENOENT;
904 lock_kernel();
905 fi = udf_find_entry(dir, dentry, &fibh, &cfi);
906 if (!fi)
907 goto out;
908
909 retval = -EIO;
910 tloc = lelb_to_cpu(cfi.icb.extLocation);
911 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
912 goto end_unlink;
913
914 if (!inode->i_nlink)
915 {
916 udf_debug("Deleting nonexistent file (%lu), %d\n",
917 inode->i_ino, inode->i_nlink);
918 inode->i_nlink = 1;
919 }
920 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
921 if (retval)
922 goto end_unlink;
923 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
924 mark_inode_dirty(dir);
9a53c3a7 925 inode_dec_link_count(inode);
1da177e4
LT		 926 inode->i_ctime = dir->i_ctime;
927 retval = 0;
928
929end_unlink:
930 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 931 brelse(fibh.ebh);
932 brelse(fibh.sbh);
1da177e4
LT		 933out:
934 unlock_kernel();
935 return retval;
936}
937
938static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname)
939{
940 struct inode * inode;
941 struct pathComponent *pc;
942 char *compstart;
943 struct udf_fileident_bh fibh;
ff116fc8 944 struct extent_position epos = { NULL, 0, {0, 0}};
1da177e4
LT		 945 int eoffset, elen = 0;
946 struct fileIdentDesc *fi;
947 struct fileIdentDesc cfi;
948 char *ea;
949 int err;
950 int block;
951 char name[UDF_NAME_LEN];
952 int namelen;
953
954 lock_kernel();
955 if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
956 goto out;
957
958 inode->i_mode = S_IFLNK | S_IRWXUGO;
959 inode->i_data.a_ops = &udf_symlink_aops;
960 inode->i_op = &page_symlink_inode_operations;
961
962 if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB)
963 {
ff116fc8
JK		 964 kernel_lb_addr eloc;
965 uint32_t elen;
1da177e4
LT		 966
967 block = udf_new_block(inode->i_sb, inode,
968 UDF_I_LOCATION(inode).partitionReferenceNum,
969 UDF_I_LOCATION(inode).logicalBlockNum, &err);
970 if (!block)
971 goto out_no_entry;
ff116fc8
JK		 972 epos.block = UDF_I_LOCATION(inode);
973 epos.offset = udf_file_entry_alloc_offset(inode);
974 epos.bh = NULL;
1da177e4
LT		 975 eloc.logicalBlockNum = block;
976 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
977 elen = inode->i_sb->s_blocksize;
978 UDF_I_LENEXTENTS(inode) = elen;
ff116fc8 979 udf_add_aext(inode, &epos, eloc, elen, 0);
3bf25cb4 980 brelse(epos.bh);
1da177e4
LT		 981
982 block = udf_get_pblock(inode->i_sb, block,
983 UDF_I_LOCATION(inode).partitionReferenceNum, 0);
ff116fc8
JK		 984 epos.bh = udf_tread(inode->i_sb, block);
985 lock_buffer(epos.bh);
986 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
987 set_buffer_uptodate(epos.bh);
988 unlock_buffer(epos.bh);
989 mark_buffer_dirty_inode(epos.bh, inode);
990 ea = epos.bh->b_data + udf_ext0_offset(inode);
1da177e4
LT		 991 }
992 else
993 ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
994
995 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
996 pc = (struct pathComponent *)ea;
997
998 if (*symname == '/')
999 {
1000 do
1001 {
1002 symname++;
1003 } while (*symname == '/');
1004
1005 pc->componentType = 1;
1006 pc->lengthComponentIdent = 0;
1007 pc->componentFileVersionNum = 0;
1008 pc += sizeof(struct pathComponent);
1009 elen += sizeof(struct pathComponent);
1010 }
1011
1012 err = -ENAMETOOLONG;
1013
1014 while (*symname)
1015 {
1016 if (elen + sizeof(struct pathComponent) > eoffset)
1017 goto out_no_entry;
1018
1019 pc = (struct pathComponent *)(ea + elen);
1020
1021 compstart = (char *)symname;
1022
1023 do
1024 {
1025 symname++;
1026 } while (*symname && *symname != '/');
1027
1028 pc->componentType = 5;
1029 pc->lengthComponentIdent = 0;
1030 pc->componentFileVersionNum = 0;
1031 if (compstart[0] == '.')
1032 {
1033 if ((symname-compstart) == 1)
1034 pc->componentType = 4;
1035 else if ((symname-compstart) == 2 && compstart[1] == '.')
1036 pc->componentType = 3;
1037 }
1038
1039 if (pc->componentType == 5)
1040 {
1041 if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart)))
1042 goto out_no_entry;
1043
1044 if (elen + sizeof(struct pathComponent) + namelen > eoffset)
1045 goto out_no_entry;
1046 else
1047 pc->lengthComponentIdent = namelen;
1048
1049 memcpy(pc->componentIdent, name, namelen);
1050 }
1051
1052 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1053
1054 if (*symname)
1055 {
1056 do
1057 {
1058 symname++;
1059 } while (*symname == '/');
1060 }
1061 }
1062
3bf25cb4 1063 brelse(epos.bh);
1da177e4
LT		 1064 inode->i_size = elen;
1065 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1066 UDF_I_LENALLOC(inode) = inode->i_size;
1067 mark_inode_dirty(inode);
1068
1069 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1070 goto out_no_entry;
1071 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1072 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1073 if (UDF_SB_LVIDBH(inode->i_sb))
1074 {
1075 struct logicalVolHeaderDesc *lvhd;
1076 uint64_t uniqueID;
1077 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1078 uniqueID = le64_to_cpu(lvhd->uniqueID);
1079 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1080 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1081 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1082 uniqueID += 16;
1083 lvhd->uniqueID = cpu_to_le64(uniqueID);
1084 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1085 }
1086 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1087 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1088 {
1089 mark_inode_dirty(dir);
1090 }
1091 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 1092 brelse(fibh.ebh);
1093 brelse(fibh.sbh);
1da177e4
LT		 1094 d_instantiate(dentry, inode);
1095 err = 0;
1096
1097out:
1098 unlock_kernel();
1099 return err;
1100
1101out_no_entry:
9a53c3a7 1102 inode_dec_link_count(inode);
1da177e4
LT		 1103 iput(inode);
1104 goto out;
1105}
1106
1107static int udf_link(struct dentry * old_dentry, struct inode * dir,
1108 struct dentry *dentry)
1109{
1110 struct inode *inode = old_dentry->d_inode;
1111 struct udf_fileident_bh fibh;
1112 struct fileIdentDesc cfi, *fi;
1113 int err;
1114
1115 lock_kernel();
1116 if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1)
1117 {
1118 unlock_kernel();
1119 return -EMLINK;
1120 }
1121
1122 if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1123 {
1124 unlock_kernel();
1125 return err;
1126 }
1127 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1128 cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1129 if (UDF_SB_LVIDBH(inode->i_sb))
1130 {
1131 struct logicalVolHeaderDesc *lvhd;
1132 uint64_t uniqueID;
1133 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1134 uniqueID = le64_to_cpu(lvhd->uniqueID);
1135 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1136 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1137 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1138 uniqueID += 16;
1139 lvhd->uniqueID = cpu_to_le64(uniqueID);
1140 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1141 }
1142 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1143 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1144 {
1145 mark_inode_dirty(dir);
1146 }
1147 if (fibh.sbh != fibh.ebh)
3bf25cb4
JK		 1148 brelse(fibh.ebh);
1149 brelse(fibh.sbh);
d8c76e6f 1150 inc_nlink(inode);
1da177e4
LT		 1151 inode->i_ctime = current_fs_time(inode->i_sb);
1152 mark_inode_dirty(inode);
1153 atomic_inc(&inode->i_count);
1154 d_instantiate(dentry, inode);
1155 unlock_kernel();
1156 return 0;
1157}
1158
1159/* Anybody can rename anything with this: the permission checks are left to the
1160 * higher-level routines.
1161 */
1162static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
1163 struct inode * new_dir, struct dentry * new_dentry)
1164{
1165 struct inode * old_inode = old_dentry->d_inode;
1166 struct inode * new_inode = new_dentry->d_inode;
1167 struct udf_fileident_bh ofibh, nfibh;
1168 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
1169 struct buffer_head *dir_bh = NULL;
1170 int retval = -ENOENT;
1171 kernel_lb_addr tloc;
1172
1173 lock_kernel();
1174 if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi)))
1175 {
1176 if (ofibh.sbh != ofibh.ebh)
3bf25cb4
JK		 1177 brelse(ofibh.ebh);
1178 brelse(ofibh.sbh);
1da177e4
LT		 1179 }
1180 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1181 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1182 != old_inode->i_ino)
1183 goto end_rename;
1184
1185 nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1186 if (nfi)
1187 {
1188 if (!new_inode)
1189 {
1190 if (nfibh.sbh != nfibh.ebh)
3bf25cb4
JK		 1191 brelse(nfibh.ebh);
1192 brelse(nfibh.sbh);
1da177e4
LT		 1193 nfi = NULL;
1194 }
1195 }
1196 if (S_ISDIR(old_inode->i_mode))
1197 {
1198 uint32_t offset = udf_ext0_offset(old_inode);
1199
1200 if (new_inode)
1201 {
1202 retval = -ENOTEMPTY;
1203 if (!empty_dir(new_inode))
1204 goto end_rename;
1205 }
1206 retval = -EIO;
1207 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1208 {
1209 dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
1210 (UDF_I_EFE(old_inode) ?
1211 sizeof(struct extendedFileEntry) :
1212 sizeof(struct fileEntry)),
1213 old_inode->i_sb->s_blocksize, &offset);
1214 }
1215 else
1216 {
1217 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1218 if (!dir_bh)
1219 goto end_rename;
1220 dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset);
1221 }
1222 if (!dir_fi)
1223 goto end_rename;
1224 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1225 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0)
1226 != old_dir->i_ino)
1227 goto end_rename;
1228
1229 retval = -EMLINK;
1230 if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1)
1231 goto end_rename;
1232 }
1233 if (!nfi)
1234 {
1235 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
1236 if (!nfi)
1237 goto end_rename;
1238 }
1239
1240 /*
1241 * Like most other Unix systems, set the ctime for inodes on a
1242 * rename.
1243 */
1244 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1245 mark_inode_dirty(old_inode);
1246
1247 /*
1248 * ok, that's it
1249 */
1250 ncfi.fileVersionNum = ocfi.fileVersionNum;
1251 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1252 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1253 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1254
1255 /* The old fid may have moved - find it again */
1256 ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1257 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1258
1259 if (new_inode)
1260 {
1da177e4 1261 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
9a53c3a7 1262 inode_dec_link_count(new_inode);
1da177e4
LT		 1263 }
1264 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1265 mark_inode_dirty(old_dir);
1266
1267 if (dir_fi)
1268 {
1269 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir));
1270 udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
1271 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1272 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1273 {
1274 mark_inode_dirty(old_inode);
1275 }
1276 else
1277 mark_buffer_dirty_inode(dir_bh, old_inode);
9a53c3a7 1278 inode_dec_link_count(old_dir);
1da177e4
LT		 1279 if (new_inode)
1280 {
9a53c3a7 1281 inode_dec_link_count(new_inode);
1da177e4
LT		 1282 }
1283 else
1284 {
d8c76e6f 1285 inc_nlink(new_dir);
1da177e4
LT		 1286 mark_inode_dirty(new_dir);
1287 }
1288 }
1289
1290 if (ofi)
1291 {
1292 if (ofibh.sbh != ofibh.ebh)
3bf25cb4
JK		 1293 brelse(ofibh.ebh);
1294 brelse(ofibh.sbh);
1da177e4
LT		 1295 }
1296
1297 retval = 0;
1298
1299end_rename:
3bf25cb4 1300 brelse(dir_bh);
1da177e4
LT		 1301 if (nfi)
1302 {
1303 if (nfibh.sbh != nfibh.ebh)
3bf25cb4
JK		 1304 brelse(nfibh.ebh);
1305 brelse(nfibh.sbh);
1da177e4
LT		 1306 }
1307 unlock_kernel();
1308 return retval;
1309}
1310
c5ef1c42 1311const struct inode_operations udf_dir_inode_operations = {
1da177e4
LT		 1312 .lookup = udf_lookup,
1313 .create = udf_create,
1314 .link = udf_link,
1315 .unlink = udf_unlink,
1316 .symlink = udf_symlink,
1317 .mkdir = udf_mkdir,
1318 .rmdir = udf_rmdir,
1319 .mknod = udf_mknod,
1320 .rename = udf_rename,
1321};
Linux 6.x block layer and io_uring tree(s)