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Commit | Line | Data |
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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/quotaops.h> | |
31 | #include <linux/smp_lock.h> | |
32 | #include <linux/buffer_head.h> | |
33 | ||
34 | static 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 | ||
41 | int 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 | ||
145 | static struct fileIdentDesc * | |
146 | udf_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; | |
157 | loff_t size; | |
158 | kernel_lb_addr bloc, eloc; | |
159 | uint32_t extoffset, elen; | |
160 | sector_t offset; | |
161 | struct buffer_head *bh = NULL; | |
162 | ||
163 | size = (udf_ext0_offset(dir) + dir->i_size) >> 2; | |
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), | |
170 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) | |
171 | { | |
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) | |
176 | extoffset -= sizeof(short_ad); | |
177 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
178 | extoffset -= sizeof(long_ad); | |
179 | } | |
180 | else | |
181 | offset = 0; | |
182 | ||
183 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) | |
184 | { | |
185 | udf_release_data(bh); | |
186 | return NULL; | |
187 | } | |
188 | } | |
189 | else | |
190 | { | |
191 | udf_release_data(bh); | |
192 | return NULL; | |
193 | } | |
194 | ||
195 | while ( (f_pos < size) ) | |
196 | { | |
197 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
198 | ||
199 | if (!fi) | |
200 | { | |
201 | if (fibh->sbh != fibh->ebh) | |
202 | udf_release_data(fibh->ebh); | |
203 | udf_release_data(fibh->sbh); | |
204 | udf_release_data(bh); | |
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 | { | |
250 | udf_release_data(bh); | |
251 | return fi; | |
252 | } | |
253 | } | |
254 | } | |
255 | if (fibh->sbh != fibh->ebh) | |
256 | udf_release_data(fibh->ebh); | |
257 | udf_release_data(fibh->sbh); | |
258 | udf_release_data(bh); | |
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 | ||
295 | static struct dentry * | |
296 | udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
297 | { | |
298 | struct inode *inode = NULL; | |
299 | struct fileIdentDesc cfi; | |
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 | ||
321 | if (udf_find_entry(dir, dentry, &fibh, &cfi)) | |
322 | { | |
323 | if (fibh.sbh != fibh.ebh) | |
324 | udf_release_data(fibh.ebh); | |
325 | udf_release_data(fibh.sbh); | |
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 | ||
339 | static struct fileIdentDesc * | |
340 | udf_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; | |
356 | kernel_lb_addr bloc, eloc; | |
357 | uint32_t extoffset, elen; | |
358 | sector_t offset; | |
359 | struct buffer_head *bh = NULL; | |
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), | |
388 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) | |
389 | { | |
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) | |
394 | extoffset -= sizeof(short_ad); | |
395 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
396 | extoffset -= sizeof(long_ad); | |
397 | } | |
398 | else | |
399 | offset = 0; | |
400 | ||
401 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) | |
402 | { | |
403 | udf_release_data(bh); | |
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 | { | |
421 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
422 | ||
423 | if (!fi) | |
424 | { | |
425 | if (fibh->sbh != fibh->ebh) | |
426 | udf_release_data(fibh->ebh); | |
427 | udf_release_data(fibh->sbh); | |
428 | udf_release_data(bh); | |
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 | { | |
458 | udf_release_data(bh); | |
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) | |
481 | udf_release_data(fibh->ebh); | |
482 | udf_release_data(fibh->sbh); | |
483 | udf_release_data(bh); | |
484 | *err = -EEXIST; | |
485 | return NULL; | |
486 | } | |
487 | } | |
488 | ||
489 | add: | |
490 | f_pos += nfidlen; | |
491 | ||
492 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB && | |
493 | sb->s_blocksize - fibh->eoffset < nfidlen) | |
494 | { | |
495 | udf_release_data(bh); | |
496 | bh = NULL; | |
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) | |
501 | udf_release_data(fibh->ebh); | |
502 | udf_release_data(fibh->sbh); | |
503 | if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err))) | |
504 | return NULL; | |
505 | bloc = UDF_I_LOCATION(dir); | |
506 | eloc.logicalBlockNum = block; | |
507 | eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum; | |
508 | elen = dir->i_sb->s_blocksize; | |
509 | extoffset = udf_file_entry_alloc_offset(dir); | |
510 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) | |
511 | extoffset += sizeof(short_ad); | |
512 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
513 | extoffset += sizeof(long_ad); | |
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 | { | |
522 | udf_release_data(fibh->sbh); | |
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 | { | |
544 | udf_release_data(fibh->sbh); | |
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 | { | |
553 | udf_release_data(bh); | |
554 | udf_release_data(fibh->sbh); | |
555 | return NULL; | |
556 | } | |
557 | ||
558 | if (!(fibh->soffset)) | |
559 | { | |
560 | if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) == | |
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 | ||
569 | udf_release_data(fibh->sbh); | |
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 | { | |
590 | udf_release_data(bh); | |
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 | { | |
599 | udf_release_data(bh); | |
600 | if (fibh->sbh != fibh->ebh) | |
601 | udf_release_data(fibh->ebh); | |
602 | udf_release_data(fibh->sbh); | |
603 | *err = -EIO; | |
604 | return NULL; | |
605 | } | |
606 | } | |
607 | ||
608 | static 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 | ||
617 | static 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) | |
659 | udf_release_data(fibh.ebh); | |
660 | udf_release_data(fibh.sbh); | |
661 | unlock_kernel(); | |
662 | d_instantiate(dentry, inode); | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static 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) | |
704 | udf_release_data(fibh.ebh); | |
705 | udf_release_data(fibh.sbh); | |
706 | d_instantiate(dentry, inode); | |
707 | err = 0; | |
708 | out: | |
709 | unlock_kernel(); | |
710 | return err; | |
711 | } | |
712 | ||
713 | static 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); | |
746 | udf_release_data(fibh.sbh); | |
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); | |
765 | inc_nlink(dir); | |
766 | mark_inode_dirty(dir); | |
767 | d_instantiate(dentry, inode); | |
768 | if (fibh.sbh != fibh.ebh) | |
769 | udf_release_data(fibh.ebh); | |
770 | udf_release_data(fibh.sbh); | |
771 | err = 0; | |
772 | out: | |
773 | unlock_kernel(); | |
774 | return err; | |
775 | } | |
776 | ||
777 | static 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; | |
784 | kernel_lb_addr bloc, eloc; | |
785 | uint32_t extoffset, elen; | |
786 | sector_t offset; | |
787 | struct buffer_head *bh = NULL; | |
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), | |
796 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) | |
797 | { | |
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) | |
802 | extoffset -= sizeof(short_ad); | |
803 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
804 | extoffset -= sizeof(long_ad); | |
805 | } | |
806 | else | |
807 | offset = 0; | |
808 | ||
809 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) | |
810 | { | |
811 | udf_release_data(bh); | |
812 | return 0; | |
813 | } | |
814 | } | |
815 | else | |
816 | { | |
817 | udf_release_data(bh); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | ||
822 | while ( (f_pos < size) ) | |
823 | { | |
824 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
825 | ||
826 | if (!fi) | |
827 | { | |
828 | if (fibh.sbh != fibh.ebh) | |
829 | udf_release_data(fibh.ebh); | |
830 | udf_release_data(fibh.sbh); | |
831 | udf_release_data(bh); | |
832 | return 0; | |
833 | } | |
834 | ||
835 | if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) | |
836 | { | |
837 | if (fibh.sbh != fibh.ebh) | |
838 | udf_release_data(fibh.ebh); | |
839 | udf_release_data(fibh.sbh); | |
840 | udf_release_data(bh); | |
841 | return 0; | |
842 | } | |
843 | } | |
844 | if (fibh.sbh != fibh.ebh) | |
845 | udf_release_data(fibh.ebh); | |
846 | udf_release_data(fibh.sbh); | |
847 | udf_release_data(bh); | |
848 | return 1; | |
849 | } | |
850 | ||
851 | static 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); | |
879 | clear_nlink(inode); | |
880 | inode->i_size = 0; | |
881 | inode_dec_link_count(dir); | |
882 | inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); | |
883 | mark_inode_dirty(dir); | |
884 | ||
885 | end_rmdir: | |
886 | if (fibh.sbh != fibh.ebh) | |
887 | udf_release_data(fibh.ebh); | |
888 | udf_release_data(fibh.sbh); | |
889 | out: | |
890 | unlock_kernel(); | |
891 | return retval; | |
892 | } | |
893 | ||
894 | static 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); | |
925 | inode_dec_link_count(inode); | |
926 | inode->i_ctime = dir->i_ctime; | |
927 | retval = 0; | |
928 | ||
929 | end_unlink: | |
930 | if (fibh.sbh != fibh.ebh) | |
931 | udf_release_data(fibh.ebh); | |
932 | udf_release_data(fibh.sbh); | |
933 | out: | |
934 | unlock_kernel(); | |
935 | return retval; | |
936 | } | |
937 | ||
938 | static 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; | |
944 | struct buffer_head *bh = NULL; | |
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 | { | |
964 | struct buffer_head *bh = NULL; | |
965 | kernel_lb_addr bloc, eloc; | |
966 | uint32_t elen, extoffset; | |
967 | ||
968 | block = udf_new_block(inode->i_sb, inode, | |
969 | UDF_I_LOCATION(inode).partitionReferenceNum, | |
970 | UDF_I_LOCATION(inode).logicalBlockNum, &err); | |
971 | if (!block) | |
972 | goto out_no_entry; | |
973 | bloc = UDF_I_LOCATION(inode); | |
974 | eloc.logicalBlockNum = block; | |
975 | eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum; | |
976 | elen = inode->i_sb->s_blocksize; | |
977 | UDF_I_LENEXTENTS(inode) = elen; | |
978 | extoffset = udf_file_entry_alloc_offset(inode); | |
979 | udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0); | |
980 | udf_release_data(bh); | |
981 | ||
982 | block = udf_get_pblock(inode->i_sb, block, | |
983 | UDF_I_LOCATION(inode).partitionReferenceNum, 0); | |
984 | bh = udf_tread(inode->i_sb, block); | |
985 | lock_buffer(bh); | |
986 | memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); | |
987 | set_buffer_uptodate(bh); | |
988 | unlock_buffer(bh); | |
989 | mark_buffer_dirty_inode(bh, inode); | |
990 | ea = bh->b_data + udf_ext0_offset(inode); | |
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 | ||
1063 | udf_release_data(bh); | |
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) | |
1092 | udf_release_data(fibh.ebh); | |
1093 | udf_release_data(fibh.sbh); | |
1094 | d_instantiate(dentry, inode); | |
1095 | err = 0; | |
1096 | ||
1097 | out: | |
1098 | unlock_kernel(); | |
1099 | return err; | |
1100 | ||
1101 | out_no_entry: | |
1102 | inode_dec_link_count(inode); | |
1103 | iput(inode); | |
1104 | goto out; | |
1105 | } | |
1106 | ||
1107 | static 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) | |
1148 | udf_release_data(fibh.ebh); | |
1149 | udf_release_data(fibh.sbh); | |
1150 | inc_nlink(inode); | |
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 | */ | |
1162 | static 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) | |
1177 | udf_release_data(ofibh.ebh); | |
1178 | udf_release_data(ofibh.sbh); | |
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) | |
1191 | udf_release_data(nfibh.ebh); | |
1192 | udf_release_data(nfibh.sbh); | |
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 | { | |
1261 | new_inode->i_ctime = current_fs_time(new_inode->i_sb); | |
1262 | inode_dec_link_count(new_inode); | |
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); | |
1278 | inode_dec_link_count(old_dir); | |
1279 | if (new_inode) | |
1280 | { | |
1281 | inode_dec_link_count(new_inode); | |
1282 | } | |
1283 | else | |
1284 | { | |
1285 | inc_nlink(new_dir); | |
1286 | mark_inode_dirty(new_dir); | |
1287 | } | |
1288 | } | |
1289 | ||
1290 | if (ofi) | |
1291 | { | |
1292 | if (ofibh.sbh != ofibh.ebh) | |
1293 | udf_release_data(ofibh.ebh); | |
1294 | udf_release_data(ofibh.sbh); | |
1295 | } | |
1296 | ||
1297 | retval = 0; | |
1298 | ||
1299 | end_rename: | |
1300 | udf_release_data(dir_bh); | |
1301 | if (nfi) | |
1302 | { | |
1303 | if (nfibh.sbh != nfibh.ebh) | |
1304 | udf_release_data(nfibh.ebh); | |
1305 | udf_release_data(nfibh.sbh); | |
1306 | } | |
1307 | unlock_kernel(); | |
1308 | return retval; | |
1309 | } | |
1310 | ||
1311 | const struct inode_operations udf_dir_inode_operations = { | |
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 | }; |