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1da177e4 LT |
1 | /* |
2 | * namei.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Inode name handling routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
7 | * CONTACTS | |
8 | * E-mail regarding any portion of the Linux UDF file system should be | |
9 | * directed to the development team mailing list (run by majordomo): | |
10 | * linux_udf@hpesjro.fc.hp.com | |
11 | * | |
12 | * COPYRIGHT | |
13 | * This file is distributed under the terms of the GNU General Public | |
14 | * License (GPL). Copies of the GPL can be obtained from: | |
15 | * ftp://prep.ai.mit.edu/pub/gnu/GPL | |
16 | * Each contributing author retains all rights to their own work. | |
17 | * | |
18 | * (C) 1998-2004 Ben Fennema | |
19 | * (C) 1999-2000 Stelias Computing Inc | |
20 | * | |
21 | * HISTORY | |
22 | * | |
23 | * 12/12/98 blf Created. Split out the lookup code from dir.c | |
24 | * 04/19/99 blf link, mknod, symlink support | |
25 | */ | |
26 | ||
27 | #include "udfdecl.h" | |
28 | ||
29 | #include "udf_i.h" | |
30 | #include "udf_sb.h" | |
31 | #include <linux/string.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/mm.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/quotaops.h> | |
36 | #include <linux/smp_lock.h> | |
37 | #include <linux/buffer_head.h> | |
38 | ||
39 | static inline int udf_match(int len1, const char *name1, int len2, const char *name2) | |
40 | { | |
41 | if (len1 != len2) | |
42 | return 0; | |
43 | return !memcmp(name1, name2, len1); | |
44 | } | |
45 | ||
46 | int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, | |
47 | struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, | |
48 | uint8_t *impuse, uint8_t *fileident) | |
49 | { | |
50 | uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag); | |
51 | uint16_t crc; | |
52 | uint8_t checksum = 0; | |
53 | int i; | |
54 | int offset; | |
55 | uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); | |
56 | uint8_t lfi = cfi->lengthFileIdent; | |
57 | int padlen = fibh->eoffset - fibh->soffset - liu - lfi - | |
58 | sizeof(struct fileIdentDesc); | |
59 | int adinicb = 0; | |
60 | ||
61 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) | |
62 | adinicb = 1; | |
63 | ||
64 | offset = fibh->soffset + sizeof(struct fileIdentDesc); | |
65 | ||
66 | if (impuse) | |
67 | { | |
68 | if (adinicb || (offset + liu < 0)) | |
69 | memcpy((uint8_t *)sfi->impUse, impuse, liu); | |
70 | else if (offset >= 0) | |
71 | memcpy(fibh->ebh->b_data + offset, impuse, liu); | |
72 | else | |
73 | { | |
74 | memcpy((uint8_t *)sfi->impUse, impuse, -offset); | |
75 | memcpy(fibh->ebh->b_data, impuse - offset, liu + offset); | |
76 | } | |
77 | } | |
78 | ||
79 | offset += liu; | |
80 | ||
81 | if (fileident) | |
82 | { | |
83 | if (adinicb || (offset + lfi < 0)) | |
84 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); | |
85 | else if (offset >= 0) | |
86 | memcpy(fibh->ebh->b_data + offset, fileident, lfi); | |
87 | else | |
88 | { | |
89 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset); | |
90 | memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset); | |
91 | } | |
92 | } | |
93 | ||
94 | offset += lfi; | |
95 | ||
96 | if (adinicb || (offset + padlen < 0)) | |
97 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); | |
98 | else if (offset >= 0) | |
99 | memset(fibh->ebh->b_data + offset, 0x00, padlen); | |
100 | else | |
101 | { | |
102 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); | |
103 | memset(fibh->ebh->b_data, 0x00, padlen + offset); | |
104 | } | |
105 | ||
106 | crc = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) - | |
107 | sizeof(tag), 0); | |
108 | ||
109 | if (fibh->sbh == fibh->ebh) | |
110 | crc = udf_crc((uint8_t *)sfi->impUse, | |
111 | crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc); | |
112 | else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) | |
113 | crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset, | |
114 | crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc); | |
115 | else | |
116 | { | |
117 | crc = udf_crc((uint8_t *)sfi->impUse, | |
118 | -fibh->soffset - sizeof(struct fileIdentDesc), crc); | |
119 | crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc); | |
120 | } | |
121 | ||
122 | cfi->descTag.descCRC = cpu_to_le16(crc); | |
123 | cfi->descTag.descCRCLength = cpu_to_le16(crclen); | |
124 | ||
125 | for (i=0; i<16; i++) | |
126 | if (i != 4) | |
127 | checksum += ((uint8_t *)&cfi->descTag)[i]; | |
128 | ||
129 | cfi->descTag.tagChecksum = checksum; | |
130 | if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) | |
131 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc)); | |
132 | else | |
133 | { | |
134 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); | |
135 | memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, | |
136 | sizeof(struct fileIdentDesc) + fibh->soffset); | |
137 | } | |
138 | ||
139 | if (adinicb) | |
140 | mark_inode_dirty(inode); | |
141 | else | |
142 | { | |
143 | if (fibh->sbh != fibh->ebh) | |
144 | mark_buffer_dirty_inode(fibh->ebh, inode); | |
145 | mark_buffer_dirty_inode(fibh->sbh, inode); | |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static struct fileIdentDesc * | |
151 | udf_find_entry(struct inode *dir, struct dentry *dentry, | |
152 | struct udf_fileident_bh *fibh, | |
153 | struct fileIdentDesc *cfi) | |
154 | { | |
155 | struct fileIdentDesc *fi=NULL; | |
156 | loff_t f_pos; | |
157 | int block, flen; | |
158 | char fname[UDF_NAME_LEN]; | |
159 | char *nameptr; | |
160 | uint8_t lfi; | |
161 | uint16_t liu; | |
162 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; | |
163 | kernel_lb_addr bloc, eloc; | |
164 | uint32_t extoffset, elen, offset; | |
165 | struct buffer_head *bh = NULL; | |
166 | ||
167 | if (!dir) | |
168 | return NULL; | |
169 | ||
170 | f_pos = (udf_ext0_offset(dir) >> 2); | |
171 | ||
172 | fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; | |
173 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
174 | fibh->sbh = fibh->ebh = NULL; | |
175 | else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), | |
176 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) | |
177 | { | |
178 | offset >>= dir->i_sb->s_blocksize_bits; | |
179 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); | |
180 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) | |
181 | { | |
182 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) | |
183 | extoffset -= sizeof(short_ad); | |
184 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
185 | extoffset -= sizeof(long_ad); | |
186 | } | |
187 | else | |
188 | offset = 0; | |
189 | ||
190 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) | |
191 | { | |
192 | udf_release_data(bh); | |
193 | return NULL; | |
194 | } | |
195 | } | |
196 | else | |
197 | { | |
198 | udf_release_data(bh); | |
199 | return NULL; | |
200 | } | |
201 | ||
202 | while ( (f_pos < size) ) | |
203 | { | |
204 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
205 | ||
206 | if (!fi) | |
207 | { | |
208 | if (fibh->sbh != fibh->ebh) | |
209 | udf_release_data(fibh->ebh); | |
210 | udf_release_data(fibh->sbh); | |
211 | udf_release_data(bh); | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | liu = le16_to_cpu(cfi->lengthOfImpUse); | |
216 | lfi = cfi->lengthFileIdent; | |
217 | ||
218 | if (fibh->sbh == fibh->ebh) | |
219 | { | |
220 | nameptr = fi->fileIdent + liu; | |
221 | } | |
222 | else | |
223 | { | |
224 | int poffset; /* Unpaded ending offset */ | |
225 | ||
226 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi; | |
227 | ||
228 | if (poffset >= lfi) | |
229 | nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi); | |
230 | else | |
231 | { | |
232 | nameptr = fname; | |
233 | memcpy(nameptr, fi->fileIdent + liu, lfi - poffset); | |
234 | memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset); | |
235 | } | |
236 | } | |
237 | ||
238 | if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 ) | |
239 | { | |
240 | if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) ) | |
241 | continue; | |
242 | } | |
243 | ||
244 | if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 ) | |
245 | { | |
246 | if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) ) | |
247 | continue; | |
248 | } | |
249 | ||
250 | if (!lfi) | |
251 | continue; | |
252 | ||
253 | if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi))) | |
254 | { | |
255 | if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) | |
256 | { | |
257 | udf_release_data(bh); | |
258 | return fi; | |
259 | } | |
260 | } | |
261 | } | |
262 | if (fibh->sbh != fibh->ebh) | |
263 | udf_release_data(fibh->ebh); | |
264 | udf_release_data(fibh->sbh); | |
265 | udf_release_data(bh); | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | /* | |
270 | * udf_lookup | |
271 | * | |
272 | * PURPOSE | |
273 | * Look-up the inode for a given name. | |
274 | * | |
275 | * DESCRIPTION | |
276 | * Required - lookup_dentry() will return -ENOTDIR if this routine is not | |
277 | * available for a directory. The filesystem is useless if this routine is | |
278 | * not available for at least the filesystem's root directory. | |
279 | * | |
280 | * This routine is passed an incomplete dentry - it must be completed by | |
281 | * calling d_add(dentry, inode). If the name does not exist, then the | |
282 | * specified inode must be set to null. An error should only be returned | |
283 | * when the lookup fails for a reason other than the name not existing. | |
284 | * Note that the directory inode semaphore is held during the call. | |
285 | * | |
286 | * Refer to lookup_dentry() in fs/namei.c | |
287 | * lookup_dentry() -> lookup() -> real_lookup() -> . | |
288 | * | |
289 | * PRE-CONDITIONS | |
290 | * dir Pointer to inode of parent directory. | |
291 | * dentry Pointer to dentry to complete. | |
292 | * nd Pointer to lookup nameidata | |
293 | * | |
294 | * POST-CONDITIONS | |
295 | * <return> Zero on success. | |
296 | * | |
297 | * HISTORY | |
298 | * July 1, 1997 - Andrew E. Mileski | |
299 | * Written, tested, and released. | |
300 | */ | |
301 | ||
302 | static struct dentry * | |
303 | udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
304 | { | |
305 | struct inode *inode = NULL; | |
306 | struct fileIdentDesc cfi, *fi; | |
307 | struct udf_fileident_bh fibh; | |
308 | ||
309 | if (dentry->d_name.len > UDF_NAME_LEN-2) | |
310 | return ERR_PTR(-ENAMETOOLONG); | |
311 | ||
312 | lock_kernel(); | |
313 | #ifdef UDF_RECOVERY | |
314 | /* temporary shorthand for specifying files by inode number */ | |
315 | if (!strncmp(dentry->d_name.name, ".B=", 3) ) | |
316 | { | |
317 | kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) }; | |
318 | inode = udf_iget(dir->i_sb, lb); | |
319 | if (!inode) | |
320 | { | |
321 | unlock_kernel(); | |
322 | return ERR_PTR(-EACCES); | |
323 | } | |
324 | } | |
325 | else | |
326 | #endif /* UDF_RECOVERY */ | |
327 | ||
328 | if ((fi = udf_find_entry(dir, dentry, &fibh, &cfi))) | |
329 | { | |
330 | if (fibh.sbh != fibh.ebh) | |
331 | udf_release_data(fibh.ebh); | |
332 | udf_release_data(fibh.sbh); | |
333 | ||
334 | inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation)); | |
335 | if ( !inode ) | |
336 | { | |
337 | unlock_kernel(); | |
338 | return ERR_PTR(-EACCES); | |
339 | } | |
340 | } | |
341 | unlock_kernel(); | |
342 | d_add(dentry, inode); | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | static struct fileIdentDesc * | |
347 | udf_add_entry(struct inode *dir, struct dentry *dentry, | |
348 | struct udf_fileident_bh *fibh, | |
349 | struct fileIdentDesc *cfi, int *err) | |
350 | { | |
351 | struct super_block *sb; | |
352 | struct fileIdentDesc *fi=NULL; | |
353 | char name[UDF_NAME_LEN], fname[UDF_NAME_LEN]; | |
354 | int namelen; | |
355 | loff_t f_pos; | |
356 | int flen; | |
357 | char *nameptr; | |
358 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; | |
359 | int nfidlen; | |
360 | uint8_t lfi; | |
361 | uint16_t liu; | |
362 | int block; | |
363 | kernel_lb_addr bloc, eloc; | |
364 | uint32_t extoffset, elen, offset; | |
365 | struct buffer_head *bh = NULL; | |
366 | ||
367 | sb = dir->i_sb; | |
368 | ||
369 | if (dentry) | |
370 | { | |
371 | if (!dentry->d_name.len) | |
372 | { | |
373 | *err = -EINVAL; | |
374 | return NULL; | |
375 | } | |
376 | ||
377 | if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len))) | |
378 | { | |
379 | *err = -ENAMETOOLONG; | |
380 | return NULL; | |
381 | } | |
382 | } | |
383 | else | |
384 | namelen = 0; | |
385 | ||
386 | nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; | |
387 | ||
388 | f_pos = (udf_ext0_offset(dir) >> 2); | |
389 | ||
390 | fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; | |
391 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
392 | fibh->sbh = fibh->ebh = NULL; | |
393 | else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), | |
394 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) | |
395 | { | |
396 | offset >>= dir->i_sb->s_blocksize_bits; | |
397 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); | |
398 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) | |
399 | { | |
400 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) | |
401 | extoffset -= sizeof(short_ad); | |
402 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
403 | extoffset -= sizeof(long_ad); | |
404 | } | |
405 | else | |
406 | offset = 0; | |
407 | ||
408 | if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) | |
409 | { | |
410 | udf_release_data(bh); | |
411 | *err = -EIO; | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | block = UDF_I_LOCATION(dir).logicalBlockNum; | |
416 | ||
417 | } | |
418 | else | |
419 | { | |
420 | block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0); | |
421 | fibh->sbh = fibh->ebh = NULL; | |
422 | fibh->soffset = fibh->eoffset = sb->s_blocksize; | |
423 | goto add; | |
424 | } | |
425 | ||
426 | while ( (f_pos < size) ) | |
427 | { | |
428 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
429 | ||
430 | if (!fi) | |
431 | { | |
432 | if (fibh->sbh != fibh->ebh) | |
433 | udf_release_data(fibh->ebh); | |
434 | udf_release_data(fibh->sbh); | |
435 | udf_release_data(bh); | |
436 | *err = -EIO; | |
437 | return NULL; | |
438 | } | |
439 | ||
440 | liu = le16_to_cpu(cfi->lengthOfImpUse); | |
441 | lfi = cfi->lengthFileIdent; | |
442 | ||
443 | if (fibh->sbh == fibh->ebh) | |
444 | nameptr = fi->fileIdent + liu; | |
445 | else | |
446 | { | |
447 | int poffset; /* Unpaded ending offset */ | |
448 | ||
449 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi; | |
450 | ||
451 | if (poffset >= lfi) | |
452 | nameptr = (char *)(fibh->ebh->b_data + poffset - lfi); | |
453 | else | |
454 | { | |
455 | nameptr = fname; | |
456 | memcpy(nameptr, fi->fileIdent + liu, lfi - poffset); | |
457 | memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset); | |
458 | } | |
459 | } | |
460 | ||
461 | if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 ) | |
462 | { | |
463 | if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen) | |
464 | { | |
465 | udf_release_data(bh); | |
466 | cfi->descTag.tagSerialNum = cpu_to_le16(1); | |
467 | cfi->fileVersionNum = cpu_to_le16(1); | |
468 | cfi->fileCharacteristics = 0; | |
469 | cfi->lengthFileIdent = namelen; | |
470 | cfi->lengthOfImpUse = cpu_to_le16(0); | |
471 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) | |
472 | return fi; | |
473 | else | |
474 | { | |
475 | *err = -EIO; | |
476 | return NULL; | |
477 | } | |
478 | } | |
479 | } | |
480 | ||
481 | if (!lfi || !dentry) | |
482 | continue; | |
483 | ||
484 | if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) && | |
485 | udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) | |
486 | { | |
487 | if (fibh->sbh != fibh->ebh) | |
488 | udf_release_data(fibh->ebh); | |
489 | udf_release_data(fibh->sbh); | |
490 | udf_release_data(bh); | |
491 | *err = -EEXIST; | |
492 | return NULL; | |
493 | } | |
494 | } | |
495 | ||
496 | add: | |
497 | f_pos += nfidlen; | |
498 | ||
499 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB && | |
500 | sb->s_blocksize - fibh->eoffset < nfidlen) | |
501 | { | |
502 | udf_release_data(bh); | |
503 | bh = NULL; | |
504 | fibh->soffset -= udf_ext0_offset(dir); | |
505 | fibh->eoffset -= udf_ext0_offset(dir); | |
506 | f_pos -= (udf_ext0_offset(dir) >> 2); | |
507 | if (fibh->sbh != fibh->ebh) | |
508 | udf_release_data(fibh->ebh); | |
509 | udf_release_data(fibh->sbh); | |
510 | if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err))) | |
511 | return NULL; | |
512 | bloc = UDF_I_LOCATION(dir); | |
513 | eloc.logicalBlockNum = block; | |
514 | eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum; | |
515 | elen = dir->i_sb->s_blocksize; | |
516 | extoffset = udf_file_entry_alloc_offset(dir); | |
517 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) | |
518 | extoffset += sizeof(short_ad); | |
519 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
520 | extoffset += sizeof(long_ad); | |
521 | } | |
522 | ||
523 | if (sb->s_blocksize - fibh->eoffset >= nfidlen) | |
524 | { | |
525 | fibh->soffset = fibh->eoffset; | |
526 | fibh->eoffset += nfidlen; | |
527 | if (fibh->sbh != fibh->ebh) | |
528 | { | |
529 | udf_release_data(fibh->sbh); | |
530 | fibh->sbh = fibh->ebh; | |
531 | } | |
532 | ||
533 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
534 | { | |
535 | block = UDF_I_LOCATION(dir).logicalBlockNum; | |
536 | fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir)); | |
537 | } | |
538 | else | |
539 | { | |
540 | block = eloc.logicalBlockNum + ((elen - 1) >> | |
541 | dir->i_sb->s_blocksize_bits); | |
542 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset); | |
543 | } | |
544 | } | |
545 | else | |
546 | { | |
547 | fibh->soffset = fibh->eoffset - sb->s_blocksize; | |
548 | fibh->eoffset += nfidlen - sb->s_blocksize; | |
549 | if (fibh->sbh != fibh->ebh) | |
550 | { | |
551 | udf_release_data(fibh->sbh); | |
552 | fibh->sbh = fibh->ebh; | |
553 | } | |
554 | ||
555 | block = eloc.logicalBlockNum + ((elen - 1) >> | |
556 | dir->i_sb->s_blocksize_bits); | |
557 | ||
558 | if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err))) | |
559 | { | |
560 | udf_release_data(bh); | |
561 | udf_release_data(fibh->sbh); | |
562 | return NULL; | |
563 | } | |
564 | ||
565 | if (!(fibh->soffset)) | |
566 | { | |
567 | if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) == | |
568 | (EXT_RECORDED_ALLOCATED >> 30)) | |
569 | { | |
570 | block = eloc.logicalBlockNum + ((elen - 1) >> | |
571 | dir->i_sb->s_blocksize_bits); | |
572 | } | |
573 | else | |
574 | block ++; | |
575 | ||
576 | udf_release_data(fibh->sbh); | |
577 | fibh->sbh = fibh->ebh; | |
578 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data); | |
579 | } | |
580 | else | |
581 | { | |
582 | fi = (struct fileIdentDesc *) | |
583 | (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset); | |
584 | } | |
585 | } | |
586 | ||
587 | memset(cfi, 0, sizeof(struct fileIdentDesc)); | |
588 | if (UDF_SB_UDFREV(sb) >= 0x0200) | |
589 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag)); | |
590 | else | |
591 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag)); | |
592 | cfi->fileVersionNum = cpu_to_le16(1); | |
593 | cfi->lengthFileIdent = namelen; | |
594 | cfi->lengthOfImpUse = cpu_to_le16(0); | |
595 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) | |
596 | { | |
597 | udf_release_data(bh); | |
598 | dir->i_size += nfidlen; | |
599 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
600 | UDF_I_LENALLOC(dir) += nfidlen; | |
601 | mark_inode_dirty(dir); | |
602 | return fi; | |
603 | } | |
604 | else | |
605 | { | |
606 | udf_release_data(bh); | |
607 | if (fibh->sbh != fibh->ebh) | |
608 | udf_release_data(fibh->ebh); | |
609 | udf_release_data(fibh->sbh); | |
610 | *err = -EIO; | |
611 | return NULL; | |
612 | } | |
613 | } | |
614 | ||
615 | static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, | |
616 | struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi) | |
617 | { | |
618 | cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; | |
619 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) | |
620 | memset(&(cfi->icb), 0x00, sizeof(long_ad)); | |
621 | return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); | |
622 | } | |
623 | ||
624 | static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) | |
625 | { | |
626 | struct udf_fileident_bh fibh; | |
627 | struct inode *inode; | |
628 | struct fileIdentDesc cfi, *fi; | |
629 | int err; | |
630 | ||
631 | lock_kernel(); | |
632 | inode = udf_new_inode(dir, mode, &err); | |
633 | if (!inode) | |
634 | { | |
635 | unlock_kernel(); | |
636 | return err; | |
637 | } | |
638 | ||
639 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) | |
640 | inode->i_data.a_ops = &udf_adinicb_aops; | |
641 | else | |
642 | inode->i_data.a_ops = &udf_aops; | |
643 | inode->i_op = &udf_file_inode_operations; | |
644 | inode->i_fop = &udf_file_operations; | |
645 | inode->i_mode = mode; | |
646 | mark_inode_dirty(inode); | |
647 | ||
648 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) | |
649 | { | |
650 | inode->i_nlink --; | |
651 | mark_inode_dirty(inode); | |
652 | iput(inode); | |
653 | unlock_kernel(); | |
654 | return err; | |
655 | } | |
656 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); | |
657 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); | |
658 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = | |
659 | cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); | |
660 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); | |
661 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
662 | { | |
663 | mark_inode_dirty(dir); | |
664 | } | |
665 | if (fibh.sbh != fibh.ebh) | |
666 | udf_release_data(fibh.ebh); | |
667 | udf_release_data(fibh.sbh); | |
668 | unlock_kernel(); | |
669 | d_instantiate(dentry, inode); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev) | |
674 | { | |
675 | struct inode * inode; | |
676 | struct udf_fileident_bh fibh; | |
677 | struct fileIdentDesc cfi, *fi; | |
678 | int err; | |
679 | ||
680 | if (!old_valid_dev(rdev)) | |
681 | return -EINVAL; | |
682 | ||
683 | lock_kernel(); | |
684 | err = -EIO; | |
685 | inode = udf_new_inode(dir, mode, &err); | |
686 | if (!inode) | |
687 | goto out; | |
688 | ||
689 | inode->i_uid = current->fsuid; | |
690 | init_special_inode(inode, mode, rdev); | |
691 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) | |
692 | { | |
693 | inode->i_nlink --; | |
694 | mark_inode_dirty(inode); | |
695 | iput(inode); | |
696 | unlock_kernel(); | |
697 | return err; | |
698 | } | |
699 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); | |
700 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); | |
701 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = | |
702 | cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); | |
703 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); | |
704 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
705 | { | |
706 | mark_inode_dirty(dir); | |
707 | } | |
708 | mark_inode_dirty(inode); | |
709 | ||
710 | if (fibh.sbh != fibh.ebh) | |
711 | udf_release_data(fibh.ebh); | |
712 | udf_release_data(fibh.sbh); | |
713 | d_instantiate(dentry, inode); | |
714 | err = 0; | |
715 | out: | |
716 | unlock_kernel(); | |
717 | return err; | |
718 | } | |
719 | ||
720 | static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode) | |
721 | { | |
722 | struct inode * inode; | |
723 | struct udf_fileident_bh fibh; | |
724 | struct fileIdentDesc cfi, *fi; | |
725 | int err; | |
726 | ||
727 | lock_kernel(); | |
728 | err = -EMLINK; | |
729 | if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1) | |
730 | goto out; | |
731 | ||
732 | err = -EIO; | |
733 | inode = udf_new_inode(dir, S_IFDIR, &err); | |
734 | if (!inode) | |
735 | goto out; | |
736 | ||
737 | inode->i_op = &udf_dir_inode_operations; | |
738 | inode->i_fop = &udf_dir_operations; | |
739 | if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err))) | |
740 | { | |
741 | inode->i_nlink--; | |
742 | mark_inode_dirty(inode); | |
743 | iput(inode); | |
744 | goto out; | |
745 | } | |
746 | inode->i_nlink = 2; | |
747 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); | |
748 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir)); | |
749 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = | |
750 | cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL); | |
751 | cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; | |
752 | udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); | |
753 | udf_release_data(fibh.sbh); | |
754 | inode->i_mode = S_IFDIR | mode; | |
755 | if (dir->i_mode & S_ISGID) | |
756 | inode->i_mode |= S_ISGID; | |
757 | mark_inode_dirty(inode); | |
758 | ||
759 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) | |
760 | { | |
761 | inode->i_nlink = 0; | |
762 | mark_inode_dirty(inode); | |
763 | iput(inode); | |
764 | goto out; | |
765 | } | |
766 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); | |
767 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); | |
768 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = | |
769 | cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL); | |
770 | cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; | |
771 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); | |
772 | dir->i_nlink++; | |
773 | mark_inode_dirty(dir); | |
774 | d_instantiate(dentry, inode); | |
775 | if (fibh.sbh != fibh.ebh) | |
776 | udf_release_data(fibh.ebh); | |
777 | udf_release_data(fibh.sbh); | |
778 | err = 0; | |
779 | out: | |
780 | unlock_kernel(); | |
781 | return err; | |
782 | } | |
783 | ||
784 | static int empty_dir(struct inode *dir) | |
785 | { | |
786 | struct fileIdentDesc *fi, cfi; | |
787 | struct udf_fileident_bh fibh; | |
788 | loff_t f_pos; | |
789 | loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2; | |
790 | int block; | |
791 | kernel_lb_addr bloc, eloc; | |
792 | uint32_t extoffset, elen, offset; | |
793 | struct buffer_head *bh = NULL; | |
794 | ||
795 | f_pos = (udf_ext0_offset(dir) >> 2); | |
796 | ||
797 | fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2; | |
798 | ||
799 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
800 | fibh.sbh = fibh.ebh = NULL; | |
801 | else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), | |
802 | &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30)) | |
803 | { | |
804 | offset >>= dir->i_sb->s_blocksize_bits; | |
805 | block = udf_get_lb_pblock(dir->i_sb, eloc, offset); | |
806 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) | |
807 | { | |
808 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT) | |
809 | extoffset -= sizeof(short_ad); | |
810 | else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG) | |
811 | extoffset -= sizeof(long_ad); | |
812 | } | |
813 | else | |
814 | offset = 0; | |
815 | ||
816 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) | |
817 | { | |
818 | udf_release_data(bh); | |
819 | return 0; | |
820 | } | |
821 | } | |
822 | else | |
823 | { | |
824 | udf_release_data(bh); | |
825 | return 0; | |
826 | } | |
827 | ||
828 | ||
829 | while ( (f_pos < size) ) | |
830 | { | |
831 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh); | |
832 | ||
833 | if (!fi) | |
834 | { | |
835 | if (fibh.sbh != fibh.ebh) | |
836 | udf_release_data(fibh.ebh); | |
837 | udf_release_data(fibh.sbh); | |
838 | udf_release_data(bh); | |
839 | return 0; | |
840 | } | |
841 | ||
842 | if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) | |
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 0; | |
849 | } | |
850 | } | |
851 | if (fibh.sbh != fibh.ebh) | |
852 | udf_release_data(fibh.ebh); | |
853 | udf_release_data(fibh.sbh); | |
854 | udf_release_data(bh); | |
855 | return 1; | |
856 | } | |
857 | ||
858 | static int udf_rmdir(struct inode * dir, struct dentry * dentry) | |
859 | { | |
860 | int retval; | |
861 | struct inode * inode = dentry->d_inode; | |
862 | struct udf_fileident_bh fibh; | |
863 | struct fileIdentDesc *fi, cfi; | |
864 | kernel_lb_addr tloc; | |
865 | ||
866 | retval = -ENOENT; | |
867 | lock_kernel(); | |
868 | fi = udf_find_entry(dir, dentry, &fibh, &cfi); | |
869 | if (!fi) | |
870 | goto out; | |
871 | ||
872 | retval = -EIO; | |
873 | tloc = lelb_to_cpu(cfi.icb.extLocation); | |
874 | if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino) | |
875 | goto end_rmdir; | |
876 | retval = -ENOTEMPTY; | |
877 | if (!empty_dir(inode)) | |
878 | goto end_rmdir; | |
879 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); | |
880 | if (retval) | |
881 | goto end_rmdir; | |
882 | if (inode->i_nlink != 2) | |
883 | udf_warning(inode->i_sb, "udf_rmdir", | |
884 | "empty directory has nlink != 2 (%d)", | |
885 | inode->i_nlink); | |
886 | inode->i_nlink = 0; | |
887 | inode->i_size = 0; | |
888 | mark_inode_dirty(inode); | |
889 | dir->i_nlink --; | |
890 | inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); | |
891 | mark_inode_dirty(dir); | |
892 | ||
893 | end_rmdir: | |
894 | if (fibh.sbh != fibh.ebh) | |
895 | udf_release_data(fibh.ebh); | |
896 | udf_release_data(fibh.sbh); | |
897 | out: | |
898 | unlock_kernel(); | |
899 | return retval; | |
900 | } | |
901 | ||
902 | static int udf_unlink(struct inode * dir, struct dentry * dentry) | |
903 | { | |
904 | int retval; | |
905 | struct inode * inode = dentry->d_inode; | |
906 | struct udf_fileident_bh fibh; | |
907 | struct fileIdentDesc *fi; | |
908 | struct fileIdentDesc cfi; | |
909 | kernel_lb_addr tloc; | |
910 | ||
911 | retval = -ENOENT; | |
912 | lock_kernel(); | |
913 | fi = udf_find_entry(dir, dentry, &fibh, &cfi); | |
914 | if (!fi) | |
915 | goto out; | |
916 | ||
917 | retval = -EIO; | |
918 | tloc = lelb_to_cpu(cfi.icb.extLocation); | |
919 | if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino) | |
920 | goto end_unlink; | |
921 | ||
922 | if (!inode->i_nlink) | |
923 | { | |
924 | udf_debug("Deleting nonexistent file (%lu), %d\n", | |
925 | inode->i_ino, inode->i_nlink); | |
926 | inode->i_nlink = 1; | |
927 | } | |
928 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); | |
929 | if (retval) | |
930 | goto end_unlink; | |
931 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); | |
932 | mark_inode_dirty(dir); | |
933 | inode->i_nlink--; | |
934 | mark_inode_dirty(inode); | |
935 | inode->i_ctime = dir->i_ctime; | |
936 | retval = 0; | |
937 | ||
938 | end_unlink: | |
939 | if (fibh.sbh != fibh.ebh) | |
940 | udf_release_data(fibh.ebh); | |
941 | udf_release_data(fibh.sbh); | |
942 | out: | |
943 | unlock_kernel(); | |
944 | return retval; | |
945 | } | |
946 | ||
947 | static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname) | |
948 | { | |
949 | struct inode * inode; | |
950 | struct pathComponent *pc; | |
951 | char *compstart; | |
952 | struct udf_fileident_bh fibh; | |
953 | struct buffer_head *bh = NULL; | |
954 | int eoffset, elen = 0; | |
955 | struct fileIdentDesc *fi; | |
956 | struct fileIdentDesc cfi; | |
957 | char *ea; | |
958 | int err; | |
959 | int block; | |
960 | char name[UDF_NAME_LEN]; | |
961 | int namelen; | |
962 | ||
963 | lock_kernel(); | |
964 | if (!(inode = udf_new_inode(dir, S_IFLNK, &err))) | |
965 | goto out; | |
966 | ||
967 | inode->i_mode = S_IFLNK | S_IRWXUGO; | |
968 | inode->i_data.a_ops = &udf_symlink_aops; | |
969 | inode->i_op = &page_symlink_inode_operations; | |
970 | ||
971 | if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB) | |
972 | { | |
973 | struct buffer_head *bh = NULL; | |
974 | kernel_lb_addr bloc, eloc; | |
975 | uint32_t elen, extoffset; | |
976 | ||
977 | block = udf_new_block(inode->i_sb, inode, | |
978 | UDF_I_LOCATION(inode).partitionReferenceNum, | |
979 | UDF_I_LOCATION(inode).logicalBlockNum, &err); | |
980 | if (!block) | |
981 | goto out_no_entry; | |
982 | bloc = UDF_I_LOCATION(inode); | |
983 | eloc.logicalBlockNum = block; | |
984 | eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum; | |
985 | elen = inode->i_sb->s_blocksize; | |
986 | UDF_I_LENEXTENTS(inode) = elen; | |
987 | extoffset = udf_file_entry_alloc_offset(inode); | |
988 | udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0); | |
989 | udf_release_data(bh); | |
990 | ||
991 | block = udf_get_pblock(inode->i_sb, block, | |
992 | UDF_I_LOCATION(inode).partitionReferenceNum, 0); | |
993 | bh = udf_tread(inode->i_sb, block); | |
994 | lock_buffer(bh); | |
995 | memset(bh->b_data, 0x00, inode->i_sb->s_blocksize); | |
996 | set_buffer_uptodate(bh); | |
997 | unlock_buffer(bh); | |
998 | mark_buffer_dirty_inode(bh, inode); | |
999 | ea = bh->b_data + udf_ext0_offset(inode); | |
1000 | } | |
1001 | else | |
1002 | ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode); | |
1003 | ||
1004 | eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode); | |
1005 | pc = (struct pathComponent *)ea; | |
1006 | ||
1007 | if (*symname == '/') | |
1008 | { | |
1009 | do | |
1010 | { | |
1011 | symname++; | |
1012 | } while (*symname == '/'); | |
1013 | ||
1014 | pc->componentType = 1; | |
1015 | pc->lengthComponentIdent = 0; | |
1016 | pc->componentFileVersionNum = 0; | |
1017 | pc += sizeof(struct pathComponent); | |
1018 | elen += sizeof(struct pathComponent); | |
1019 | } | |
1020 | ||
1021 | err = -ENAMETOOLONG; | |
1022 | ||
1023 | while (*symname) | |
1024 | { | |
1025 | if (elen + sizeof(struct pathComponent) > eoffset) | |
1026 | goto out_no_entry; | |
1027 | ||
1028 | pc = (struct pathComponent *)(ea + elen); | |
1029 | ||
1030 | compstart = (char *)symname; | |
1031 | ||
1032 | do | |
1033 | { | |
1034 | symname++; | |
1035 | } while (*symname && *symname != '/'); | |
1036 | ||
1037 | pc->componentType = 5; | |
1038 | pc->lengthComponentIdent = 0; | |
1039 | pc->componentFileVersionNum = 0; | |
1040 | if (compstart[0] == '.') | |
1041 | { | |
1042 | if ((symname-compstart) == 1) | |
1043 | pc->componentType = 4; | |
1044 | else if ((symname-compstart) == 2 && compstart[1] == '.') | |
1045 | pc->componentType = 3; | |
1046 | } | |
1047 | ||
1048 | if (pc->componentType == 5) | |
1049 | { | |
1050 | if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart))) | |
1051 | goto out_no_entry; | |
1052 | ||
1053 | if (elen + sizeof(struct pathComponent) + namelen > eoffset) | |
1054 | goto out_no_entry; | |
1055 | else | |
1056 | pc->lengthComponentIdent = namelen; | |
1057 | ||
1058 | memcpy(pc->componentIdent, name, namelen); | |
1059 | } | |
1060 | ||
1061 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; | |
1062 | ||
1063 | if (*symname) | |
1064 | { | |
1065 | do | |
1066 | { | |
1067 | symname++; | |
1068 | } while (*symname == '/'); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | udf_release_data(bh); | |
1073 | inode->i_size = elen; | |
1074 | if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) | |
1075 | UDF_I_LENALLOC(inode) = inode->i_size; | |
1076 | mark_inode_dirty(inode); | |
1077 | ||
1078 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) | |
1079 | goto out_no_entry; | |
1080 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); | |
1081 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); | |
1082 | if (UDF_SB_LVIDBH(inode->i_sb)) | |
1083 | { | |
1084 | struct logicalVolHeaderDesc *lvhd; | |
1085 | uint64_t uniqueID; | |
1086 | lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse); | |
1087 | uniqueID = le64_to_cpu(lvhd->uniqueID); | |
1088 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = | |
1089 | cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); | |
1090 | if (!(++uniqueID & 0x00000000FFFFFFFFUL)) | |
1091 | uniqueID += 16; | |
1092 | lvhd->uniqueID = cpu_to_le64(uniqueID); | |
1093 | mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb)); | |
1094 | } | |
1095 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); | |
1096 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
1097 | { | |
1098 | mark_inode_dirty(dir); | |
1099 | } | |
1100 | if (fibh.sbh != fibh.ebh) | |
1101 | udf_release_data(fibh.ebh); | |
1102 | udf_release_data(fibh.sbh); | |
1103 | d_instantiate(dentry, inode); | |
1104 | err = 0; | |
1105 | ||
1106 | out: | |
1107 | unlock_kernel(); | |
1108 | return err; | |
1109 | ||
1110 | out_no_entry: | |
1111 | inode->i_nlink--; | |
1112 | mark_inode_dirty(inode); | |
1113 | iput(inode); | |
1114 | goto out; | |
1115 | } | |
1116 | ||
1117 | static int udf_link(struct dentry * old_dentry, struct inode * dir, | |
1118 | struct dentry *dentry) | |
1119 | { | |
1120 | struct inode *inode = old_dentry->d_inode; | |
1121 | struct udf_fileident_bh fibh; | |
1122 | struct fileIdentDesc cfi, *fi; | |
1123 | int err; | |
1124 | ||
1125 | lock_kernel(); | |
1126 | if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1) | |
1127 | { | |
1128 | unlock_kernel(); | |
1129 | return -EMLINK; | |
1130 | } | |
1131 | ||
1132 | if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) | |
1133 | { | |
1134 | unlock_kernel(); | |
1135 | return err; | |
1136 | } | |
1137 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); | |
1138 | cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode)); | |
1139 | if (UDF_SB_LVIDBH(inode->i_sb)) | |
1140 | { | |
1141 | struct logicalVolHeaderDesc *lvhd; | |
1142 | uint64_t uniqueID; | |
1143 | lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse); | |
1144 | uniqueID = le64_to_cpu(lvhd->uniqueID); | |
1145 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = | |
1146 | cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); | |
1147 | if (!(++uniqueID & 0x00000000FFFFFFFFUL)) | |
1148 | uniqueID += 16; | |
1149 | lvhd->uniqueID = cpu_to_le64(uniqueID); | |
1150 | mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb)); | |
1151 | } | |
1152 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); | |
1153 | if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) | |
1154 | { | |
1155 | mark_inode_dirty(dir); | |
1156 | } | |
1157 | if (fibh.sbh != fibh.ebh) | |
1158 | udf_release_data(fibh.ebh); | |
1159 | udf_release_data(fibh.sbh); | |
1160 | inode->i_nlink ++; | |
1161 | inode->i_ctime = current_fs_time(inode->i_sb); | |
1162 | mark_inode_dirty(inode); | |
1163 | atomic_inc(&inode->i_count); | |
1164 | d_instantiate(dentry, inode); | |
1165 | unlock_kernel(); | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | /* Anybody can rename anything with this: the permission checks are left to the | |
1170 | * higher-level routines. | |
1171 | */ | |
1172 | static int udf_rename (struct inode * old_dir, struct dentry * old_dentry, | |
1173 | struct inode * new_dir, struct dentry * new_dentry) | |
1174 | { | |
1175 | struct inode * old_inode = old_dentry->d_inode; | |
1176 | struct inode * new_inode = new_dentry->d_inode; | |
1177 | struct udf_fileident_bh ofibh, nfibh; | |
1178 | struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi; | |
1179 | struct buffer_head *dir_bh = NULL; | |
1180 | int retval = -ENOENT; | |
1181 | kernel_lb_addr tloc; | |
1182 | ||
1183 | lock_kernel(); | |
1184 | if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi))) | |
1185 | { | |
1186 | if (ofibh.sbh != ofibh.ebh) | |
1187 | udf_release_data(ofibh.ebh); | |
1188 | udf_release_data(ofibh.sbh); | |
1189 | } | |
1190 | tloc = lelb_to_cpu(ocfi.icb.extLocation); | |
1191 | if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0) | |
1192 | != old_inode->i_ino) | |
1193 | goto end_rename; | |
1194 | ||
1195 | nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi); | |
1196 | if (nfi) | |
1197 | { | |
1198 | if (!new_inode) | |
1199 | { | |
1200 | if (nfibh.sbh != nfibh.ebh) | |
1201 | udf_release_data(nfibh.ebh); | |
1202 | udf_release_data(nfibh.sbh); | |
1203 | nfi = NULL; | |
1204 | } | |
1205 | } | |
1206 | if (S_ISDIR(old_inode->i_mode)) | |
1207 | { | |
1208 | uint32_t offset = udf_ext0_offset(old_inode); | |
1209 | ||
1210 | if (new_inode) | |
1211 | { | |
1212 | retval = -ENOTEMPTY; | |
1213 | if (!empty_dir(new_inode)) | |
1214 | goto end_rename; | |
1215 | } | |
1216 | retval = -EIO; | |
1217 | if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) | |
1218 | { | |
1219 | dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) - | |
1220 | (UDF_I_EFE(old_inode) ? | |
1221 | sizeof(struct extendedFileEntry) : | |
1222 | sizeof(struct fileEntry)), | |
1223 | old_inode->i_sb->s_blocksize, &offset); | |
1224 | } | |
1225 | else | |
1226 | { | |
1227 | dir_bh = udf_bread(old_inode, 0, 0, &retval); | |
1228 | if (!dir_bh) | |
1229 | goto end_rename; | |
1230 | dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset); | |
1231 | } | |
1232 | if (!dir_fi) | |
1233 | goto end_rename; | |
1234 | tloc = lelb_to_cpu(dir_fi->icb.extLocation); | |
1235 | if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) | |
1236 | != old_dir->i_ino) | |
1237 | goto end_rename; | |
1238 | ||
1239 | retval = -EMLINK; | |
1240 | if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1) | |
1241 | goto end_rename; | |
1242 | } | |
1243 | if (!nfi) | |
1244 | { | |
1245 | nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval); | |
1246 | if (!nfi) | |
1247 | goto end_rename; | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Like most other Unix systems, set the ctime for inodes on a | |
1252 | * rename. | |
1253 | */ | |
1254 | old_inode->i_ctime = current_fs_time(old_inode->i_sb); | |
1255 | mark_inode_dirty(old_inode); | |
1256 | ||
1257 | /* | |
1258 | * ok, that's it | |
1259 | */ | |
1260 | ncfi.fileVersionNum = ocfi.fileVersionNum; | |
1261 | ncfi.fileCharacteristics = ocfi.fileCharacteristics; | |
1262 | memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad)); | |
1263 | udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); | |
1264 | ||
1265 | /* The old fid may have moved - find it again */ | |
1266 | ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi); | |
1267 | udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); | |
1268 | ||
1269 | if (new_inode) | |
1270 | { | |
1271 | new_inode->i_nlink--; | |
1272 | new_inode->i_ctime = current_fs_time(new_inode->i_sb); | |
1273 | mark_inode_dirty(new_inode); | |
1274 | } | |
1275 | old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); | |
1276 | mark_inode_dirty(old_dir); | |
1277 | ||
1278 | if (dir_fi) | |
1279 | { | |
1280 | dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir)); | |
1281 | udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) + | |
1282 | le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); | |
1283 | if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) | |
1284 | { | |
1285 | mark_inode_dirty(old_inode); | |
1286 | } | |
1287 | else | |
1288 | mark_buffer_dirty_inode(dir_bh, old_inode); | |
1289 | old_dir->i_nlink --; | |
1290 | mark_inode_dirty(old_dir); | |
1291 | if (new_inode) | |
1292 | { | |
1293 | new_inode->i_nlink --; | |
1294 | mark_inode_dirty(new_inode); | |
1295 | } | |
1296 | else | |
1297 | { | |
1298 | new_dir->i_nlink ++; | |
1299 | mark_inode_dirty(new_dir); | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | if (ofi) | |
1304 | { | |
1305 | if (ofibh.sbh != ofibh.ebh) | |
1306 | udf_release_data(ofibh.ebh); | |
1307 | udf_release_data(ofibh.sbh); | |
1308 | } | |
1309 | ||
1310 | retval = 0; | |
1311 | ||
1312 | end_rename: | |
1313 | udf_release_data(dir_bh); | |
1314 | if (nfi) | |
1315 | { | |
1316 | if (nfibh.sbh != nfibh.ebh) | |
1317 | udf_release_data(nfibh.ebh); | |
1318 | udf_release_data(nfibh.sbh); | |
1319 | } | |
1320 | unlock_kernel(); | |
1321 | return retval; | |
1322 | } | |
1323 | ||
1324 | struct inode_operations udf_dir_inode_operations = { | |
1325 | .lookup = udf_lookup, | |
1326 | .create = udf_create, | |
1327 | .link = udf_link, | |
1328 | .unlink = udf_unlink, | |
1329 | .symlink = udf_symlink, | |
1330 | .mkdir = udf_mkdir, | |
1331 | .rmdir = udf_rmdir, | |
1332 | .mknod = udf_mknod, | |
1333 | .rename = udf_rename, | |
1334 | }; |