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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/buffer_head.h> |
31 | #include <linux/sched.h> |
32 | #include <linux/crc-itu-t.h> |
33 | #include <linux/exportfs.h> |
34 | |
35 | enum { UDF_MAX_LINKS = 0xffff }; |
36 | |
37 | static inline int udf_match(int len1, const unsigned char *name1, int len2, |
38 | const unsigned char *name2) |
39 | { |
40 | if (len1 != len2) |
41 | return 0; |
42 | |
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(struct tag); |
51 | uint16_t crc; |
52 | int offset; |
53 | uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); |
54 | uint8_t lfi = cfi->lengthFileIdent; |
55 | int padlen = fibh->eoffset - fibh->soffset - liu - lfi - |
56 | sizeof(struct fileIdentDesc); |
57 | int adinicb = 0; |
58 | |
59 | if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
60 | adinicb = 1; |
61 | |
62 | offset = fibh->soffset + sizeof(struct fileIdentDesc); |
63 | |
64 | if (impuse) { |
65 | if (adinicb || (offset + liu < 0)) { |
66 | memcpy((uint8_t *)sfi->impUse, impuse, liu); |
67 | } else if (offset >= 0) { |
68 | memcpy(fibh->ebh->b_data + offset, impuse, liu); |
69 | } else { |
70 | memcpy((uint8_t *)sfi->impUse, impuse, -offset); |
71 | memcpy(fibh->ebh->b_data, impuse - offset, |
72 | liu + offset); |
73 | } |
74 | } |
75 | |
76 | offset += liu; |
77 | |
78 | if (fileident) { |
79 | if (adinicb || (offset + lfi < 0)) { |
80 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); |
81 | } else if (offset >= 0) { |
82 | memcpy(fibh->ebh->b_data + offset, fileident, lfi); |
83 | } else { |
84 | memcpy((uint8_t *)sfi->fileIdent + liu, fileident, |
85 | -offset); |
86 | memcpy(fibh->ebh->b_data, fileident - offset, |
87 | lfi + offset); |
88 | } |
89 | } |
90 | |
91 | offset += lfi; |
92 | |
93 | if (adinicb || (offset + padlen < 0)) { |
94 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); |
95 | } else if (offset >= 0) { |
96 | memset(fibh->ebh->b_data + offset, 0x00, padlen); |
97 | } else { |
98 | memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); |
99 | memset(fibh->ebh->b_data, 0x00, padlen + offset); |
100 | } |
101 | |
102 | crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), |
103 | sizeof(struct fileIdentDesc) - sizeof(struct tag)); |
104 | |
105 | if (fibh->sbh == fibh->ebh) { |
106 | crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, |
107 | crclen + sizeof(struct tag) - |
108 | sizeof(struct fileIdentDesc)); |
109 | } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { |
110 | crc = crc_itu_t(crc, fibh->ebh->b_data + |
111 | sizeof(struct fileIdentDesc) + |
112 | fibh->soffset, |
113 | crclen + sizeof(struct tag) - |
114 | sizeof(struct fileIdentDesc)); |
115 | } else { |
116 | crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, |
117 | -fibh->soffset - sizeof(struct fileIdentDesc)); |
118 | crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); |
119 | } |
120 | |
121 | cfi->descTag.descCRC = cpu_to_le16(crc); |
122 | cfi->descTag.descCRCLength = cpu_to_le16(crclen); |
123 | cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); |
124 | |
125 | if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { |
126 | memcpy((uint8_t *)sfi, (uint8_t *)cfi, |
127 | sizeof(struct fileIdentDesc)); |
128 | } else { |
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 | if (fibh->sbh != fibh->ebh) |
138 | mark_buffer_dirty_inode(fibh->ebh, inode); |
139 | mark_buffer_dirty_inode(fibh->sbh, inode); |
140 | } |
141 | return 0; |
142 | } |
143 | |
144 | static struct fileIdentDesc *udf_find_entry(struct inode *dir, |
145 | const struct qstr *child, |
146 | struct udf_fileident_bh *fibh, |
147 | struct fileIdentDesc *cfi) |
148 | { |
149 | struct fileIdentDesc *fi = NULL; |
150 | loff_t f_pos; |
151 | int block, flen; |
152 | unsigned char *fname = NULL; |
153 | unsigned char *nameptr; |
154 | uint8_t lfi; |
155 | uint16_t liu; |
156 | loff_t size; |
157 | struct kernel_lb_addr eloc; |
158 | uint32_t elen; |
159 | sector_t offset; |
160 | struct extent_position epos = {}; |
161 | struct udf_inode_info *dinfo = UDF_I(dir); |
162 | int isdotdot = child->len == 2 && |
163 | child->name[0] == '.' && child->name[1] == '.'; |
164 | |
165 | size = udf_ext0_offset(dir) + dir->i_size; |
166 | f_pos = udf_ext0_offset(dir); |
167 | |
168 | fibh->sbh = fibh->ebh = NULL; |
169 | fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
170 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
171 | if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, |
172 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) |
173 | goto out_err; |
174 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
175 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
176 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
177 | epos.offset -= sizeof(struct short_ad); |
178 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
179 | epos.offset -= sizeof(struct long_ad); |
180 | } else |
181 | offset = 0; |
182 | |
183 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
184 | if (!fibh->sbh) |
185 | goto out_err; |
186 | } |
187 | |
188 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
189 | if (!fname) |
190 | goto out_err; |
191 | |
192 | while (f_pos < size) { |
193 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
194 | &elen, &offset); |
195 | if (!fi) |
196 | goto out_err; |
197 | |
198 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
199 | lfi = cfi->lengthFileIdent; |
200 | |
201 | if (fibh->sbh == fibh->ebh) { |
202 | nameptr = fi->fileIdent + liu; |
203 | } else { |
204 | int poffset; /* Unpaded ending offset */ |
205 | |
206 | poffset = fibh->soffset + sizeof(struct fileIdentDesc) + |
207 | liu + lfi; |
208 | |
209 | if (poffset >= lfi) |
210 | nameptr = (uint8_t *)(fibh->ebh->b_data + |
211 | poffset - lfi); |
212 | else { |
213 | nameptr = fname; |
214 | memcpy(nameptr, fi->fileIdent + liu, |
215 | lfi - poffset); |
216 | memcpy(nameptr + lfi - poffset, |
217 | fibh->ebh->b_data, poffset); |
218 | } |
219 | } |
220 | |
221 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
222 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) |
223 | continue; |
224 | } |
225 | |
226 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { |
227 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) |
228 | continue; |
229 | } |
230 | |
231 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && |
232 | isdotdot) |
233 | goto out_ok; |
234 | |
235 | if (!lfi) |
236 | continue; |
237 | |
238 | flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); |
239 | if (flen && udf_match(flen, fname, child->len, child->name)) |
240 | goto out_ok; |
241 | } |
242 | |
243 | out_err: |
244 | fi = NULL; |
245 | if (fibh->sbh != fibh->ebh) |
246 | brelse(fibh->ebh); |
247 | brelse(fibh->sbh); |
248 | out_ok: |
249 | brelse(epos.bh); |
250 | kfree(fname); |
251 | |
252 | return fi; |
253 | } |
254 | |
255 | static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, |
256 | struct nameidata *nd) |
257 | { |
258 | struct inode *inode = NULL; |
259 | struct fileIdentDesc cfi; |
260 | struct udf_fileident_bh fibh; |
261 | |
262 | if (dentry->d_name.len > UDF_NAME_LEN - 2) |
263 | return ERR_PTR(-ENAMETOOLONG); |
264 | |
265 | #ifdef UDF_RECOVERY |
266 | /* temporary shorthand for specifying files by inode number */ |
267 | if (!strncmp(dentry->d_name.name, ".B=", 3)) { |
268 | struct kernel_lb_addr lb = { |
269 | .logicalBlockNum = 0, |
270 | .partitionReferenceNum = |
271 | simple_strtoul(dentry->d_name.name + 3, |
272 | NULL, 0), |
273 | }; |
274 | inode = udf_iget(dir->i_sb, lb); |
275 | if (!inode) { |
276 | return ERR_PTR(-EACCES); |
277 | } |
278 | } else |
279 | #endif /* UDF_RECOVERY */ |
280 | |
281 | if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) { |
282 | struct kernel_lb_addr loc; |
283 | |
284 | if (fibh.sbh != fibh.ebh) |
285 | brelse(fibh.ebh); |
286 | brelse(fibh.sbh); |
287 | |
288 | loc = lelb_to_cpu(cfi.icb.extLocation); |
289 | inode = udf_iget(dir->i_sb, &loc); |
290 | if (!inode) { |
291 | return ERR_PTR(-EACCES); |
292 | } |
293 | } |
294 | |
295 | return d_splice_alias(inode, dentry); |
296 | } |
297 | |
298 | static struct fileIdentDesc *udf_add_entry(struct inode *dir, |
299 | struct dentry *dentry, |
300 | struct udf_fileident_bh *fibh, |
301 | struct fileIdentDesc *cfi, int *err) |
302 | { |
303 | struct super_block *sb = dir->i_sb; |
304 | struct fileIdentDesc *fi = NULL; |
305 | unsigned char *name = NULL; |
306 | int namelen; |
307 | loff_t f_pos; |
308 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
309 | int nfidlen; |
310 | uint8_t lfi; |
311 | uint16_t liu; |
312 | int block; |
313 | struct kernel_lb_addr eloc; |
314 | uint32_t elen = 0; |
315 | sector_t offset; |
316 | struct extent_position epos = {}; |
317 | struct udf_inode_info *dinfo; |
318 | |
319 | fibh->sbh = fibh->ebh = NULL; |
320 | name = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
321 | if (!name) { |
322 | *err = -ENOMEM; |
323 | goto out_err; |
324 | } |
325 | |
326 | if (dentry) { |
327 | if (!dentry->d_name.len) { |
328 | *err = -EINVAL; |
329 | goto out_err; |
330 | } |
331 | namelen = udf_put_filename(sb, dentry->d_name.name, name, |
332 | dentry->d_name.len); |
333 | if (!namelen) { |
334 | *err = -ENAMETOOLONG; |
335 | goto out_err; |
336 | } |
337 | } else { |
338 | namelen = 0; |
339 | } |
340 | |
341 | nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; |
342 | |
343 | f_pos = udf_ext0_offset(dir); |
344 | |
345 | fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
346 | dinfo = UDF_I(dir); |
347 | if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
348 | if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, |
349 | &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { |
350 | block = udf_get_lb_pblock(dir->i_sb, |
351 | &dinfo->i_location, 0); |
352 | fibh->soffset = fibh->eoffset = sb->s_blocksize; |
353 | goto add; |
354 | } |
355 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
356 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
357 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
358 | epos.offset -= sizeof(struct short_ad); |
359 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
360 | epos.offset -= sizeof(struct long_ad); |
361 | } else |
362 | offset = 0; |
363 | |
364 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
365 | if (!fibh->sbh) { |
366 | *err = -EIO; |
367 | goto out_err; |
368 | } |
369 | |
370 | block = dinfo->i_location.logicalBlockNum; |
371 | } |
372 | |
373 | while (f_pos < size) { |
374 | fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, |
375 | &elen, &offset); |
376 | |
377 | if (!fi) { |
378 | *err = -EIO; |
379 | goto out_err; |
380 | } |
381 | |
382 | liu = le16_to_cpu(cfi->lengthOfImpUse); |
383 | lfi = cfi->lengthFileIdent; |
384 | |
385 | if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
386 | if (((sizeof(struct fileIdentDesc) + |
387 | liu + lfi + 3) & ~3) == nfidlen) { |
388 | cfi->descTag.tagSerialNum = cpu_to_le16(1); |
389 | cfi->fileVersionNum = cpu_to_le16(1); |
390 | cfi->fileCharacteristics = 0; |
391 | cfi->lengthFileIdent = namelen; |
392 | cfi->lengthOfImpUse = cpu_to_le16(0); |
393 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, |
394 | name)) |
395 | goto out_ok; |
396 | else { |
397 | *err = -EIO; |
398 | goto out_err; |
399 | } |
400 | } |
401 | } |
402 | } |
403 | |
404 | add: |
405 | f_pos += nfidlen; |
406 | |
407 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && |
408 | sb->s_blocksize - fibh->eoffset < nfidlen) { |
409 | brelse(epos.bh); |
410 | epos.bh = NULL; |
411 | fibh->soffset -= udf_ext0_offset(dir); |
412 | fibh->eoffset -= udf_ext0_offset(dir); |
413 | f_pos -= udf_ext0_offset(dir); |
414 | if (fibh->sbh != fibh->ebh) |
415 | brelse(fibh->ebh); |
416 | brelse(fibh->sbh); |
417 | fibh->sbh = fibh->ebh = |
418 | udf_expand_dir_adinicb(dir, &block, err); |
419 | if (!fibh->sbh) |
420 | goto out_err; |
421 | epos.block = dinfo->i_location; |
422 | epos.offset = udf_file_entry_alloc_offset(dir); |
423 | /* Load extent udf_expand_dir_adinicb() has created */ |
424 | udf_current_aext(dir, &epos, &eloc, &elen, 1); |
425 | } |
426 | |
427 | /* Entry fits into current block? */ |
428 | if (sb->s_blocksize - fibh->eoffset >= nfidlen) { |
429 | fibh->soffset = fibh->eoffset; |
430 | fibh->eoffset += nfidlen; |
431 | if (fibh->sbh != fibh->ebh) { |
432 | brelse(fibh->sbh); |
433 | fibh->sbh = fibh->ebh; |
434 | } |
435 | |
436 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
437 | block = dinfo->i_location.logicalBlockNum; |
438 | fi = (struct fileIdentDesc *) |
439 | (dinfo->i_ext.i_data + |
440 | fibh->soffset - |
441 | udf_ext0_offset(dir) + |
442 | dinfo->i_lenEAttr); |
443 | } else { |
444 | block = eloc.logicalBlockNum + |
445 | ((elen - 1) >> |
446 | dir->i_sb->s_blocksize_bits); |
447 | fi = (struct fileIdentDesc *) |
448 | (fibh->sbh->b_data + fibh->soffset); |
449 | } |
450 | } else { |
451 | /* Round up last extent in the file */ |
452 | elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); |
453 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
454 | epos.offset -= sizeof(struct short_ad); |
455 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
456 | epos.offset -= sizeof(struct long_ad); |
457 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
458 | dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize |
459 | - 1) & ~(sb->s_blocksize - 1); |
460 | |
461 | fibh->soffset = fibh->eoffset - sb->s_blocksize; |
462 | fibh->eoffset += nfidlen - sb->s_blocksize; |
463 | if (fibh->sbh != fibh->ebh) { |
464 | brelse(fibh->sbh); |
465 | fibh->sbh = fibh->ebh; |
466 | } |
467 | |
468 | block = eloc.logicalBlockNum + ((elen - 1) >> |
469 | dir->i_sb->s_blocksize_bits); |
470 | fibh->ebh = udf_bread(dir, |
471 | f_pos >> dir->i_sb->s_blocksize_bits, 1, err); |
472 | if (!fibh->ebh) |
473 | goto out_err; |
474 | /* Extents could have been merged, invalidate our position */ |
475 | brelse(epos.bh); |
476 | epos.bh = NULL; |
477 | epos.block = dinfo->i_location; |
478 | epos.offset = udf_file_entry_alloc_offset(dir); |
479 | |
480 | if (!fibh->soffset) { |
481 | /* Find the freshly allocated block */ |
482 | while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
483 | (EXT_RECORDED_ALLOCATED >> 30)) |
484 | ; |
485 | block = eloc.logicalBlockNum + ((elen - 1) >> |
486 | dir->i_sb->s_blocksize_bits); |
487 | brelse(fibh->sbh); |
488 | fibh->sbh = fibh->ebh; |
489 | fi = (struct fileIdentDesc *)(fibh->sbh->b_data); |
490 | } else { |
491 | fi = (struct fileIdentDesc *) |
492 | (fibh->sbh->b_data + sb->s_blocksize + |
493 | fibh->soffset); |
494 | } |
495 | } |
496 | |
497 | memset(cfi, 0, sizeof(struct fileIdentDesc)); |
498 | if (UDF_SB(sb)->s_udfrev >= 0x0200) |
499 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, |
500 | sizeof(struct tag)); |
501 | else |
502 | udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, |
503 | sizeof(struct tag)); |
504 | cfi->fileVersionNum = cpu_to_le16(1); |
505 | cfi->lengthFileIdent = namelen; |
506 | cfi->lengthOfImpUse = cpu_to_le16(0); |
507 | if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { |
508 | dir->i_size += nfidlen; |
509 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
510 | dinfo->i_lenAlloc += nfidlen; |
511 | else { |
512 | /* Find the last extent and truncate it to proper size */ |
513 | while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == |
514 | (EXT_RECORDED_ALLOCATED >> 30)) |
515 | ; |
516 | elen -= dinfo->i_lenExtents - dir->i_size; |
517 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
518 | epos.offset -= sizeof(struct short_ad); |
519 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
520 | epos.offset -= sizeof(struct long_ad); |
521 | udf_write_aext(dir, &epos, &eloc, elen, 1); |
522 | dinfo->i_lenExtents = dir->i_size; |
523 | } |
524 | |
525 | mark_inode_dirty(dir); |
526 | goto out_ok; |
527 | } else { |
528 | *err = -EIO; |
529 | goto out_err; |
530 | } |
531 | |
532 | out_err: |
533 | fi = NULL; |
534 | if (fibh->sbh != fibh->ebh) |
535 | brelse(fibh->ebh); |
536 | brelse(fibh->sbh); |
537 | out_ok: |
538 | brelse(epos.bh); |
539 | kfree(name); |
540 | return fi; |
541 | } |
542 | |
543 | static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, |
544 | struct udf_fileident_bh *fibh, |
545 | struct fileIdentDesc *cfi) |
546 | { |
547 | cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; |
548 | |
549 | if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) |
550 | memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); |
551 | |
552 | return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); |
553 | } |
554 | |
555 | static int udf_create(struct inode *dir, struct dentry *dentry, int mode, |
556 | struct nameidata *nd) |
557 | { |
558 | struct udf_fileident_bh fibh; |
559 | struct inode *inode; |
560 | struct fileIdentDesc cfi, *fi; |
561 | int err; |
562 | struct udf_inode_info *iinfo; |
563 | |
564 | inode = udf_new_inode(dir, mode, &err); |
565 | if (!inode) { |
566 | return err; |
567 | } |
568 | |
569 | iinfo = UDF_I(inode); |
570 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
571 | inode->i_data.a_ops = &udf_adinicb_aops; |
572 | else |
573 | inode->i_data.a_ops = &udf_aops; |
574 | inode->i_op = &udf_file_inode_operations; |
575 | inode->i_fop = &udf_file_operations; |
576 | mark_inode_dirty(inode); |
577 | |
578 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
579 | if (!fi) { |
580 | inode->i_nlink--; |
581 | mark_inode_dirty(inode); |
582 | iput(inode); |
583 | return err; |
584 | } |
585 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
586 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
587 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
588 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
589 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
590 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
591 | mark_inode_dirty(dir); |
592 | if (fibh.sbh != fibh.ebh) |
593 | brelse(fibh.ebh); |
594 | brelse(fibh.sbh); |
595 | d_instantiate(dentry, inode); |
596 | |
597 | return 0; |
598 | } |
599 | |
600 | static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode, |
601 | dev_t rdev) |
602 | { |
603 | struct inode *inode; |
604 | struct udf_fileident_bh fibh; |
605 | struct fileIdentDesc cfi, *fi; |
606 | int err; |
607 | struct udf_inode_info *iinfo; |
608 | |
609 | if (!old_valid_dev(rdev)) |
610 | return -EINVAL; |
611 | |
612 | err = -EIO; |
613 | inode = udf_new_inode(dir, mode, &err); |
614 | if (!inode) |
615 | goto out; |
616 | |
617 | iinfo = UDF_I(inode); |
618 | init_special_inode(inode, mode, rdev); |
619 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
620 | if (!fi) { |
621 | inode->i_nlink--; |
622 | mark_inode_dirty(inode); |
623 | iput(inode); |
624 | return err; |
625 | } |
626 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
627 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
628 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
629 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
630 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
631 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
632 | mark_inode_dirty(dir); |
633 | mark_inode_dirty(inode); |
634 | |
635 | if (fibh.sbh != fibh.ebh) |
636 | brelse(fibh.ebh); |
637 | brelse(fibh.sbh); |
638 | d_instantiate(dentry, inode); |
639 | err = 0; |
640 | |
641 | out: |
642 | return err; |
643 | } |
644 | |
645 | static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
646 | { |
647 | struct inode *inode; |
648 | struct udf_fileident_bh fibh; |
649 | struct fileIdentDesc cfi, *fi; |
650 | int err; |
651 | struct udf_inode_info *dinfo = UDF_I(dir); |
652 | struct udf_inode_info *iinfo; |
653 | |
654 | err = -EMLINK; |
655 | if (dir->i_nlink >= UDF_MAX_LINKS) |
656 | goto out; |
657 | |
658 | err = -EIO; |
659 | inode = udf_new_inode(dir, S_IFDIR | mode, &err); |
660 | if (!inode) |
661 | goto out; |
662 | |
663 | iinfo = UDF_I(inode); |
664 | inode->i_op = &udf_dir_inode_operations; |
665 | inode->i_fop = &udf_dir_operations; |
666 | fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); |
667 | if (!fi) { |
668 | inode->i_nlink--; |
669 | mark_inode_dirty(inode); |
670 | iput(inode); |
671 | goto out; |
672 | } |
673 | inode->i_nlink = 2; |
674 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
675 | cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); |
676 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
677 | cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); |
678 | cfi.fileCharacteristics = |
679 | FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; |
680 | udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); |
681 | brelse(fibh.sbh); |
682 | mark_inode_dirty(inode); |
683 | |
684 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
685 | if (!fi) { |
686 | inode->i_nlink = 0; |
687 | mark_inode_dirty(inode); |
688 | iput(inode); |
689 | goto out; |
690 | } |
691 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
692 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
693 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
694 | cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); |
695 | cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; |
696 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
697 | inc_nlink(dir); |
698 | mark_inode_dirty(dir); |
699 | d_instantiate(dentry, inode); |
700 | if (fibh.sbh != fibh.ebh) |
701 | brelse(fibh.ebh); |
702 | brelse(fibh.sbh); |
703 | err = 0; |
704 | |
705 | out: |
706 | return err; |
707 | } |
708 | |
709 | static int empty_dir(struct inode *dir) |
710 | { |
711 | struct fileIdentDesc *fi, cfi; |
712 | struct udf_fileident_bh fibh; |
713 | loff_t f_pos; |
714 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
715 | int block; |
716 | struct kernel_lb_addr eloc; |
717 | uint32_t elen; |
718 | sector_t offset; |
719 | struct extent_position epos = {}; |
720 | struct udf_inode_info *dinfo = UDF_I(dir); |
721 | |
722 | f_pos = udf_ext0_offset(dir); |
723 | fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); |
724 | |
725 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
726 | fibh.sbh = fibh.ebh = NULL; |
727 | else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, |
728 | &epos, &eloc, &elen, &offset) == |
729 | (EXT_RECORDED_ALLOCATED >> 30)) { |
730 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
731 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
732 | if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
733 | epos.offset -= sizeof(struct short_ad); |
734 | else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) |
735 | epos.offset -= sizeof(struct long_ad); |
736 | } else |
737 | offset = 0; |
738 | |
739 | fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); |
740 | if (!fibh.sbh) { |
741 | brelse(epos.bh); |
742 | return 0; |
743 | } |
744 | } else { |
745 | brelse(epos.bh); |
746 | return 0; |
747 | } |
748 | |
749 | while (f_pos < size) { |
750 | fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, |
751 | &elen, &offset); |
752 | if (!fi) { |
753 | if (fibh.sbh != fibh.ebh) |
754 | brelse(fibh.ebh); |
755 | brelse(fibh.sbh); |
756 | brelse(epos.bh); |
757 | return 0; |
758 | } |
759 | |
760 | if (cfi.lengthFileIdent && |
761 | (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { |
762 | if (fibh.sbh != fibh.ebh) |
763 | brelse(fibh.ebh); |
764 | brelse(fibh.sbh); |
765 | brelse(epos.bh); |
766 | return 0; |
767 | } |
768 | } |
769 | |
770 | if (fibh.sbh != fibh.ebh) |
771 | brelse(fibh.ebh); |
772 | brelse(fibh.sbh); |
773 | brelse(epos.bh); |
774 | |
775 | return 1; |
776 | } |
777 | |
778 | static int udf_rmdir(struct inode *dir, struct dentry *dentry) |
779 | { |
780 | int retval; |
781 | struct inode *inode = dentry->d_inode; |
782 | struct udf_fileident_bh fibh; |
783 | struct fileIdentDesc *fi, cfi; |
784 | struct kernel_lb_addr tloc; |
785 | |
786 | retval = -ENOENT; |
787 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
788 | if (!fi) |
789 | goto out; |
790 | |
791 | retval = -EIO; |
792 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
793 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
794 | goto end_rmdir; |
795 | retval = -ENOTEMPTY; |
796 | if (!empty_dir(inode)) |
797 | goto end_rmdir; |
798 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
799 | if (retval) |
800 | goto end_rmdir; |
801 | if (inode->i_nlink != 2) |
802 | udf_warning(inode->i_sb, "udf_rmdir", |
803 | "empty directory has nlink != 2 (%d)", |
804 | inode->i_nlink); |
805 | clear_nlink(inode); |
806 | inode->i_size = 0; |
807 | inode_dec_link_count(dir); |
808 | inode->i_ctime = dir->i_ctime = dir->i_mtime = |
809 | current_fs_time(dir->i_sb); |
810 | mark_inode_dirty(dir); |
811 | |
812 | end_rmdir: |
813 | if (fibh.sbh != fibh.ebh) |
814 | brelse(fibh.ebh); |
815 | brelse(fibh.sbh); |
816 | |
817 | out: |
818 | return retval; |
819 | } |
820 | |
821 | static int udf_unlink(struct inode *dir, struct dentry *dentry) |
822 | { |
823 | int retval; |
824 | struct inode *inode = dentry->d_inode; |
825 | struct udf_fileident_bh fibh; |
826 | struct fileIdentDesc *fi; |
827 | struct fileIdentDesc cfi; |
828 | struct kernel_lb_addr tloc; |
829 | |
830 | retval = -ENOENT; |
831 | fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); |
832 | if (!fi) |
833 | goto out; |
834 | |
835 | retval = -EIO; |
836 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
837 | if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) |
838 | goto end_unlink; |
839 | |
840 | if (!inode->i_nlink) { |
841 | udf_debug("Deleting nonexistent file (%lu), %d\n", |
842 | inode->i_ino, inode->i_nlink); |
843 | inode->i_nlink = 1; |
844 | } |
845 | retval = udf_delete_entry(dir, fi, &fibh, &cfi); |
846 | if (retval) |
847 | goto end_unlink; |
848 | dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); |
849 | mark_inode_dirty(dir); |
850 | inode_dec_link_count(inode); |
851 | inode->i_ctime = dir->i_ctime; |
852 | retval = 0; |
853 | |
854 | end_unlink: |
855 | if (fibh.sbh != fibh.ebh) |
856 | brelse(fibh.ebh); |
857 | brelse(fibh.sbh); |
858 | |
859 | out: |
860 | return retval; |
861 | } |
862 | |
863 | static int udf_symlink(struct inode *dir, struct dentry *dentry, |
864 | const char *symname) |
865 | { |
866 | struct inode *inode; |
867 | struct pathComponent *pc; |
868 | const char *compstart; |
869 | struct udf_fileident_bh fibh; |
870 | struct extent_position epos = {}; |
871 | int eoffset, elen = 0; |
872 | struct fileIdentDesc *fi; |
873 | struct fileIdentDesc cfi; |
874 | uint8_t *ea; |
875 | int err; |
876 | int block; |
877 | unsigned char *name = NULL; |
878 | int namelen; |
879 | struct udf_inode_info *iinfo; |
880 | struct super_block *sb = dir->i_sb; |
881 | |
882 | inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err); |
883 | if (!inode) |
884 | goto out; |
885 | |
886 | iinfo = UDF_I(inode); |
887 | down_write(&iinfo->i_data_sem); |
888 | name = kmalloc(UDF_NAME_LEN, GFP_NOFS); |
889 | if (!name) { |
890 | err = -ENOMEM; |
891 | goto out_no_entry; |
892 | } |
893 | |
894 | inode->i_data.a_ops = &udf_symlink_aops; |
895 | inode->i_op = &udf_symlink_inode_operations; |
896 | |
897 | if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
898 | struct kernel_lb_addr eloc; |
899 | uint32_t bsize; |
900 | |
901 | block = udf_new_block(sb, inode, |
902 | iinfo->i_location.partitionReferenceNum, |
903 | iinfo->i_location.logicalBlockNum, &err); |
904 | if (!block) |
905 | goto out_no_entry; |
906 | epos.block = iinfo->i_location; |
907 | epos.offset = udf_file_entry_alloc_offset(inode); |
908 | epos.bh = NULL; |
909 | eloc.logicalBlockNum = block; |
910 | eloc.partitionReferenceNum = |
911 | iinfo->i_location.partitionReferenceNum; |
912 | bsize = sb->s_blocksize; |
913 | iinfo->i_lenExtents = bsize; |
914 | udf_add_aext(inode, &epos, &eloc, bsize, 0); |
915 | brelse(epos.bh); |
916 | |
917 | block = udf_get_pblock(sb, block, |
918 | iinfo->i_location.partitionReferenceNum, |
919 | 0); |
920 | epos.bh = udf_tgetblk(sb, block); |
921 | lock_buffer(epos.bh); |
922 | memset(epos.bh->b_data, 0x00, bsize); |
923 | set_buffer_uptodate(epos.bh); |
924 | unlock_buffer(epos.bh); |
925 | mark_buffer_dirty_inode(epos.bh, inode); |
926 | ea = epos.bh->b_data + udf_ext0_offset(inode); |
927 | } else |
928 | ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; |
929 | |
930 | eoffset = sb->s_blocksize - udf_ext0_offset(inode); |
931 | pc = (struct pathComponent *)ea; |
932 | |
933 | if (*symname == '/') { |
934 | do { |
935 | symname++; |
936 | } while (*symname == '/'); |
937 | |
938 | pc->componentType = 1; |
939 | pc->lengthComponentIdent = 0; |
940 | pc->componentFileVersionNum = 0; |
941 | elen += sizeof(struct pathComponent); |
942 | } |
943 | |
944 | err = -ENAMETOOLONG; |
945 | |
946 | while (*symname) { |
947 | if (elen + sizeof(struct pathComponent) > eoffset) |
948 | goto out_no_entry; |
949 | |
950 | pc = (struct pathComponent *)(ea + elen); |
951 | |
952 | compstart = symname; |
953 | |
954 | do { |
955 | symname++; |
956 | } while (*symname && *symname != '/'); |
957 | |
958 | pc->componentType = 5; |
959 | pc->lengthComponentIdent = 0; |
960 | pc->componentFileVersionNum = 0; |
961 | if (compstart[0] == '.') { |
962 | if ((symname - compstart) == 1) |
963 | pc->componentType = 4; |
964 | else if ((symname - compstart) == 2 && |
965 | compstart[1] == '.') |
966 | pc->componentType = 3; |
967 | } |
968 | |
969 | if (pc->componentType == 5) { |
970 | namelen = udf_put_filename(sb, compstart, name, |
971 | symname - compstart); |
972 | if (!namelen) |
973 | goto out_no_entry; |
974 | |
975 | if (elen + sizeof(struct pathComponent) + namelen > |
976 | eoffset) |
977 | goto out_no_entry; |
978 | else |
979 | pc->lengthComponentIdent = namelen; |
980 | |
981 | memcpy(pc->componentIdent, name, namelen); |
982 | } |
983 | |
984 | elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; |
985 | |
986 | if (*symname) { |
987 | do { |
988 | symname++; |
989 | } while (*symname == '/'); |
990 | } |
991 | } |
992 | |
993 | brelse(epos.bh); |
994 | inode->i_size = elen; |
995 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
996 | iinfo->i_lenAlloc = inode->i_size; |
997 | else |
998 | udf_truncate_tail_extent(inode); |
999 | mark_inode_dirty(inode); |
1000 | |
1001 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
1002 | if (!fi) |
1003 | goto out_no_entry; |
1004 | cfi.icb.extLength = cpu_to_le32(sb->s_blocksize); |
1005 | cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); |
1006 | if (UDF_SB(inode->i_sb)->s_lvid_bh) { |
1007 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
1008 | cpu_to_le32(lvid_get_unique_id(sb)); |
1009 | } |
1010 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
1011 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
1012 | mark_inode_dirty(dir); |
1013 | up_write(&iinfo->i_data_sem); |
1014 | if (fibh.sbh != fibh.ebh) |
1015 | brelse(fibh.ebh); |
1016 | brelse(fibh.sbh); |
1017 | d_instantiate(dentry, inode); |
1018 | err = 0; |
1019 | |
1020 | out: |
1021 | kfree(name); |
1022 | return err; |
1023 | |
1024 | out_no_entry: |
1025 | up_write(&iinfo->i_data_sem); |
1026 | inode_dec_link_count(inode); |
1027 | iput(inode); |
1028 | goto out; |
1029 | } |
1030 | |
1031 | static int udf_link(struct dentry *old_dentry, struct inode *dir, |
1032 | struct dentry *dentry) |
1033 | { |
1034 | struct inode *inode = old_dentry->d_inode; |
1035 | struct udf_fileident_bh fibh; |
1036 | struct fileIdentDesc cfi, *fi; |
1037 | int err; |
1038 | |
1039 | if (inode->i_nlink >= UDF_MAX_LINKS) |
1040 | return -EMLINK; |
1041 | |
1042 | fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); |
1043 | if (!fi) { |
1044 | return err; |
1045 | } |
1046 | cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); |
1047 | cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); |
1048 | if (UDF_SB(inode->i_sb)->s_lvid_bh) { |
1049 | *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = |
1050 | cpu_to_le32(lvid_get_unique_id(inode->i_sb)); |
1051 | } |
1052 | udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); |
1053 | if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
1054 | mark_inode_dirty(dir); |
1055 | |
1056 | if (fibh.sbh != fibh.ebh) |
1057 | brelse(fibh.ebh); |
1058 | brelse(fibh.sbh); |
1059 | inc_nlink(inode); |
1060 | inode->i_ctime = current_fs_time(inode->i_sb); |
1061 | mark_inode_dirty(inode); |
1062 | ihold(inode); |
1063 | d_instantiate(dentry, inode); |
1064 | |
1065 | return 0; |
1066 | } |
1067 | |
1068 | /* Anybody can rename anything with this: the permission checks are left to the |
1069 | * higher-level routines. |
1070 | */ |
1071 | static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, |
1072 | struct inode *new_dir, struct dentry *new_dentry) |
1073 | { |
1074 | struct inode *old_inode = old_dentry->d_inode; |
1075 | struct inode *new_inode = new_dentry->d_inode; |
1076 | struct udf_fileident_bh ofibh, nfibh; |
1077 | struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; |
1078 | struct fileIdentDesc ocfi, ncfi; |
1079 | struct buffer_head *dir_bh = NULL; |
1080 | int retval = -ENOENT; |
1081 | struct kernel_lb_addr tloc; |
1082 | struct udf_inode_info *old_iinfo = UDF_I(old_inode); |
1083 | |
1084 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
1085 | if (ofi) { |
1086 | if (ofibh.sbh != ofibh.ebh) |
1087 | brelse(ofibh.ebh); |
1088 | brelse(ofibh.sbh); |
1089 | } |
1090 | tloc = lelb_to_cpu(ocfi.icb.extLocation); |
1091 | if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) |
1092 | != old_inode->i_ino) |
1093 | goto end_rename; |
1094 | |
1095 | nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); |
1096 | if (nfi) { |
1097 | if (!new_inode) { |
1098 | if (nfibh.sbh != nfibh.ebh) |
1099 | brelse(nfibh.ebh); |
1100 | brelse(nfibh.sbh); |
1101 | nfi = NULL; |
1102 | } |
1103 | } |
1104 | if (S_ISDIR(old_inode->i_mode)) { |
1105 | int offset = udf_ext0_offset(old_inode); |
1106 | |
1107 | if (new_inode) { |
1108 | retval = -ENOTEMPTY; |
1109 | if (!empty_dir(new_inode)) |
1110 | goto end_rename; |
1111 | } |
1112 | retval = -EIO; |
1113 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
1114 | dir_fi = udf_get_fileident( |
1115 | old_iinfo->i_ext.i_data - |
1116 | (old_iinfo->i_efe ? |
1117 | sizeof(struct extendedFileEntry) : |
1118 | sizeof(struct fileEntry)), |
1119 | old_inode->i_sb->s_blocksize, &offset); |
1120 | } else { |
1121 | dir_bh = udf_bread(old_inode, 0, 0, &retval); |
1122 | if (!dir_bh) |
1123 | goto end_rename; |
1124 | dir_fi = udf_get_fileident(dir_bh->b_data, |
1125 | old_inode->i_sb->s_blocksize, &offset); |
1126 | } |
1127 | if (!dir_fi) |
1128 | goto end_rename; |
1129 | tloc = lelb_to_cpu(dir_fi->icb.extLocation); |
1130 | if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != |
1131 | old_dir->i_ino) |
1132 | goto end_rename; |
1133 | |
1134 | retval = -EMLINK; |
1135 | if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS) |
1136 | goto end_rename; |
1137 | } |
1138 | if (!nfi) { |
1139 | nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, |
1140 | &retval); |
1141 | if (!nfi) |
1142 | goto end_rename; |
1143 | } |
1144 | |
1145 | /* |
1146 | * Like most other Unix systems, set the ctime for inodes on a |
1147 | * rename. |
1148 | */ |
1149 | old_inode->i_ctime = current_fs_time(old_inode->i_sb); |
1150 | mark_inode_dirty(old_inode); |
1151 | |
1152 | /* |
1153 | * ok, that's it |
1154 | */ |
1155 | ncfi.fileVersionNum = ocfi.fileVersionNum; |
1156 | ncfi.fileCharacteristics = ocfi.fileCharacteristics; |
1157 | memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad)); |
1158 | udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); |
1159 | |
1160 | /* The old fid may have moved - find it again */ |
1161 | ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); |
1162 | udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); |
1163 | |
1164 | if (new_inode) { |
1165 | new_inode->i_ctime = current_fs_time(new_inode->i_sb); |
1166 | inode_dec_link_count(new_inode); |
1167 | } |
1168 | old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); |
1169 | mark_inode_dirty(old_dir); |
1170 | |
1171 | if (dir_fi) { |
1172 | dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); |
1173 | udf_update_tag((char *)dir_fi, |
1174 | (sizeof(struct fileIdentDesc) + |
1175 | le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); |
1176 | if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) |
1177 | mark_inode_dirty(old_inode); |
1178 | else |
1179 | mark_buffer_dirty_inode(dir_bh, old_inode); |
1180 | |
1181 | inode_dec_link_count(old_dir); |
1182 | if (new_inode) |
1183 | inode_dec_link_count(new_inode); |
1184 | else { |
1185 | inc_nlink(new_dir); |
1186 | mark_inode_dirty(new_dir); |
1187 | } |
1188 | } |
1189 | |
1190 | if (ofi) { |
1191 | if (ofibh.sbh != ofibh.ebh) |
1192 | brelse(ofibh.ebh); |
1193 | brelse(ofibh.sbh); |
1194 | } |
1195 | |
1196 | retval = 0; |
1197 | |
1198 | end_rename: |
1199 | brelse(dir_bh); |
1200 | if (nfi) { |
1201 | if (nfibh.sbh != nfibh.ebh) |
1202 | brelse(nfibh.ebh); |
1203 | brelse(nfibh.sbh); |
1204 | } |
1205 | |
1206 | return retval; |
1207 | } |
1208 | |
1209 | static struct dentry *udf_get_parent(struct dentry *child) |
1210 | { |
1211 | struct kernel_lb_addr tloc; |
1212 | struct inode *inode = NULL; |
1213 | struct qstr dotdot = {.name = "..", .len = 2}; |
1214 | struct fileIdentDesc cfi; |
1215 | struct udf_fileident_bh fibh; |
1216 | |
1217 | if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi)) |
1218 | goto out_unlock; |
1219 | |
1220 | if (fibh.sbh != fibh.ebh) |
1221 | brelse(fibh.ebh); |
1222 | brelse(fibh.sbh); |
1223 | |
1224 | tloc = lelb_to_cpu(cfi.icb.extLocation); |
1225 | inode = udf_iget(child->d_inode->i_sb, &tloc); |
1226 | if (!inode) |
1227 | goto out_unlock; |
1228 | |
1229 | return d_obtain_alias(inode); |
1230 | out_unlock: |
1231 | return ERR_PTR(-EACCES); |
1232 | } |
1233 | |
1234 | |
1235 | static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, |
1236 | u16 partref, __u32 generation) |
1237 | { |
1238 | struct inode *inode; |
1239 | struct kernel_lb_addr loc; |
1240 | |
1241 | if (block == 0) |
1242 | return ERR_PTR(-ESTALE); |
1243 | |
1244 | loc.logicalBlockNum = block; |
1245 | loc.partitionReferenceNum = partref; |
1246 | inode = udf_iget(sb, &loc); |
1247 | |
1248 | if (inode == NULL) |
1249 | return ERR_PTR(-ENOMEM); |
1250 | |
1251 | if (generation && inode->i_generation != generation) { |
1252 | iput(inode); |
1253 | return ERR_PTR(-ESTALE); |
1254 | } |
1255 | return d_obtain_alias(inode); |
1256 | } |
1257 | |
1258 | static struct dentry *udf_fh_to_dentry(struct super_block *sb, |
1259 | struct fid *fid, int fh_len, int fh_type) |
1260 | { |
1261 | if ((fh_len != 3 && fh_len != 5) || |
1262 | (fh_type != FILEID_UDF_WITH_PARENT && |
1263 | fh_type != FILEID_UDF_WITHOUT_PARENT)) |
1264 | return NULL; |
1265 | |
1266 | return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, |
1267 | fid->udf.generation); |
1268 | } |
1269 | |
1270 | static struct dentry *udf_fh_to_parent(struct super_block *sb, |
1271 | struct fid *fid, int fh_len, int fh_type) |
1272 | { |
1273 | if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) |
1274 | return NULL; |
1275 | |
1276 | return udf_nfs_get_inode(sb, fid->udf.parent_block, |
1277 | fid->udf.parent_partref, |
1278 | fid->udf.parent_generation); |
1279 | } |
1280 | static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp, |
1281 | int connectable) |
1282 | { |
1283 | int len = *lenp; |
1284 | struct inode *inode = de->d_inode; |
1285 | struct kernel_lb_addr location = UDF_I(inode)->i_location; |
1286 | struct fid *fid = (struct fid *)fh; |
1287 | int type = FILEID_UDF_WITHOUT_PARENT; |
1288 | |
1289 | if (connectable && (len < 5)) { |
1290 | *lenp = 5; |
1291 | return 255; |
1292 | } else if (len < 3) { |
1293 | *lenp = 3; |
1294 | return 255; |
1295 | } |
1296 | |
1297 | *lenp = 3; |
1298 | fid->udf.block = location.logicalBlockNum; |
1299 | fid->udf.partref = location.partitionReferenceNum; |
1300 | fid->udf.generation = inode->i_generation; |
1301 | |
1302 | if (connectable && !S_ISDIR(inode->i_mode)) { |
1303 | spin_lock(&de->d_lock); |
1304 | inode = de->d_parent->d_inode; |
1305 | location = UDF_I(inode)->i_location; |
1306 | fid->udf.parent_block = location.logicalBlockNum; |
1307 | fid->udf.parent_partref = location.partitionReferenceNum; |
1308 | fid->udf.parent_generation = inode->i_generation; |
1309 | spin_unlock(&de->d_lock); |
1310 | *lenp = 5; |
1311 | type = FILEID_UDF_WITH_PARENT; |
1312 | } |
1313 | |
1314 | return type; |
1315 | } |
1316 | |
1317 | const struct export_operations udf_export_ops = { |
1318 | .encode_fh = udf_encode_fh, |
1319 | .fh_to_dentry = udf_fh_to_dentry, |
1320 | .fh_to_parent = udf_fh_to_parent, |
1321 | .get_parent = udf_get_parent, |
1322 | }; |
1323 | |
1324 | const 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 | }; |
1335 | const struct inode_operations udf_symlink_inode_operations = { |
1336 | .readlink = generic_readlink, |
1337 | .follow_link = page_follow_link_light, |
1338 | .put_link = page_put_link, |
1339 | }; |
1340 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9