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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
35static inline int udf_match(int len1, const unsigned char *name1, int len2,
36 const unsigned char *name2)
37{
38 if (len1 != len2)
39 return 0;
40
41 return !memcmp(name1, name2, len1);
42}
43
44int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
45 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
46 uint8_t *impuse, uint8_t *fileident)
47{
48 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
49 uint16_t crc;
50 int offset;
51 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
52 uint8_t lfi = cfi->lengthFileIdent;
53 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
54 sizeof(struct fileIdentDesc);
55 int adinicb = 0;
56
57 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
58 adinicb = 1;
59
60 offset = fibh->soffset + sizeof(struct fileIdentDesc);
61
62 if (impuse) {
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 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
69 memcpy(fibh->ebh->b_data, impuse - offset,
70 liu + offset);
71 }
72 }
73
74 offset += liu;
75
76 if (fileident) {
77 if (adinicb || (offset + lfi < 0)) {
78 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
79 } else if (offset >= 0) {
80 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
81 } else {
82 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
83 -offset);
84 memcpy(fibh->ebh->b_data, fileident - offset,
85 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 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
97 memset(fibh->ebh->b_data, 0x00, padlen + offset);
98 }
99
100 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
101 sizeof(struct fileIdentDesc) - sizeof(struct tag));
102
103 if (fibh->sbh == fibh->ebh) {
104 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
105 crclen + sizeof(struct tag) -
106 sizeof(struct fileIdentDesc));
107 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
108 crc = crc_itu_t(crc, fibh->ebh->b_data +
109 sizeof(struct fileIdentDesc) +
110 fibh->soffset,
111 crclen + sizeof(struct tag) -
112 sizeof(struct fileIdentDesc));
113 } else {
114 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
115 -fibh->soffset - sizeof(struct fileIdentDesc));
116 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
117 }
118
119 cfi->descTag.descCRC = cpu_to_le16(crc);
120 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
121 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
122
123 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
124 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
125 sizeof(struct fileIdentDesc));
126 } else {
127 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
128 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
129 sizeof(struct fileIdentDesc) + fibh->soffset);
130 }
131
132 if (adinicb) {
133 mark_inode_dirty(inode);
134 } else {
135 if (fibh->sbh != fibh->ebh)
136 mark_buffer_dirty_inode(fibh->ebh, inode);
137 mark_buffer_dirty_inode(fibh->sbh, inode);
138 }
139 return 0;
140}
141
142static struct fileIdentDesc *udf_find_entry(struct inode *dir,
143 const struct qstr *child,
144 struct udf_fileident_bh *fibh,
145 struct fileIdentDesc *cfi)
146{
147 struct fileIdentDesc *fi = NULL;
148 loff_t f_pos;
149 int block, flen;
150 unsigned char *fname = NULL;
151 unsigned char *nameptr;
152 uint8_t lfi;
153 uint16_t liu;
154 loff_t size;
155 struct kernel_lb_addr eloc;
156 uint32_t elen;
157 sector_t offset;
158 struct extent_position epos = {};
159 struct udf_inode_info *dinfo = UDF_I(dir);
160 int isdotdot = child->len == 2 &&
161 child->name[0] == '.' && child->name[1] == '.';
162 struct super_block *sb = dir->i_sb;
163
164 size = udf_ext0_offset(dir) + dir->i_size;
165 f_pos = udf_ext0_offset(dir);
166
167 fibh->sbh = fibh->ebh = NULL;
168 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
169 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
170 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
171 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
172 goto out_err;
173 block = udf_get_lb_pblock(sb, &eloc, offset);
174 if ((++offset << sb->s_blocksize_bits) < elen) {
175 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
176 epos.offset -= sizeof(struct short_ad);
177 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
178 epos.offset -= sizeof(struct long_ad);
179 } else
180 offset = 0;
181
182 fibh->sbh = fibh->ebh = udf_tread(sb, block);
183 if (!fibh->sbh)
184 goto out_err;
185 }
186
187 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
188 if (!fname)
189 goto out_err;
190
191 while (f_pos < size) {
192 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
193 &elen, &offset);
194 if (!fi)
195 goto out_err;
196
197 liu = le16_to_cpu(cfi->lengthOfImpUse);
198 lfi = cfi->lengthFileIdent;
199
200 if (fibh->sbh == fibh->ebh) {
201 nameptr = fi->fileIdent + liu;
202 } else {
203 int poffset;
204
205 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
206 liu + lfi;
207
208 if (poffset >= lfi)
209 nameptr = (uint8_t *)(fibh->ebh->b_data +
210 poffset - lfi);
211 else {
212 nameptr = fname;
213 memcpy(nameptr, fi->fileIdent + liu,
214 lfi - poffset);
215 memcpy(nameptr + lfi - poffset,
216 fibh->ebh->b_data, poffset);
217 }
218 }
219
220 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
221 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
222 continue;
223 }
224
225 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
226 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
227 continue;
228 }
229
230 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
231 isdotdot)
232 goto out_ok;
233
234 if (!lfi)
235 continue;
236
237 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
238 if (flen && udf_match(flen, fname, child->len, child->name))
239 goto out_ok;
240 }
241
242out_err:
243 fi = NULL;
244 if (fibh->sbh != fibh->ebh)
245 brelse(fibh->ebh);
246 brelse(fibh->sbh);
247out_ok:
248 brelse(epos.bh);
249 kfree(fname);
250
251 return fi;
252}
253
254static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
255 unsigned int flags)
256{
257 struct inode *inode = NULL;
258 struct fileIdentDesc cfi;
259 struct udf_fileident_bh fibh;
260
261 if (dentry->d_name.len > UDF_NAME_LEN - 2)
262 return ERR_PTR(-ENAMETOOLONG);
263
264#ifdef UDF_RECOVERY
265
266 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
267 struct kernel_lb_addr lb = {
268 .logicalBlockNum = 0,
269 .partitionReferenceNum =
270 simple_strtoul(dentry->d_name.name + 3,
271 NULL, 0),
272 };
273 inode = udf_iget(dir->i_sb, lb);
274 if (IS_ERR(inode))
275 return inode;
276 } else
277#endif
278
279 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
280 struct kernel_lb_addr loc;
281
282 if (fibh.sbh != fibh.ebh)
283 brelse(fibh.ebh);
284 brelse(fibh.sbh);
285
286 loc = lelb_to_cpu(cfi.icb.extLocation);
287 inode = udf_iget(dir->i_sb, &loc);
288 if (IS_ERR(inode))
289 return ERR_CAST(inode);
290 }
291
292 return d_splice_alias(inode, dentry);
293}
294
295static struct fileIdentDesc *udf_add_entry(struct inode *dir,
296 struct dentry *dentry,
297 struct udf_fileident_bh *fibh,
298 struct fileIdentDesc *cfi, int *err)
299{
300 struct super_block *sb = dir->i_sb;
301 struct fileIdentDesc *fi = NULL;
302 unsigned char *name = NULL;
303 int namelen;
304 loff_t f_pos;
305 loff_t size = udf_ext0_offset(dir) + dir->i_size;
306 int nfidlen;
307 uint8_t lfi;
308 uint16_t liu;
309 int block;
310 struct kernel_lb_addr eloc;
311 uint32_t elen = 0;
312 sector_t offset;
313 struct extent_position epos = {};
314 struct udf_inode_info *dinfo;
315
316 fibh->sbh = fibh->ebh = NULL;
317 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
318 if (!name) {
319 *err = -ENOMEM;
320 goto out_err;
321 }
322
323 if (dentry) {
324 if (!dentry->d_name.len) {
325 *err = -EINVAL;
326 goto out_err;
327 }
328 namelen = udf_put_filename(sb, dentry->d_name.name, name,
329 dentry->d_name.len);
330 if (!namelen) {
331 *err = -ENAMETOOLONG;
332 goto out_err;
333 }
334 } else {
335 namelen = 0;
336 }
337
338 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
339
340 f_pos = udf_ext0_offset(dir);
341
342 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
343 dinfo = UDF_I(dir);
344 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
345 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
346 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
347 block = udf_get_lb_pblock(dir->i_sb,
348 &dinfo->i_location, 0);
349 fibh->soffset = fibh->eoffset = sb->s_blocksize;
350 goto add;
351 }
352 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
353 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
354 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
355 epos.offset -= sizeof(struct short_ad);
356 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
357 epos.offset -= sizeof(struct long_ad);
358 } else
359 offset = 0;
360
361 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
362 if (!fibh->sbh) {
363 *err = -EIO;
364 goto out_err;
365 }
366
367 block = dinfo->i_location.logicalBlockNum;
368 }
369
370 while (f_pos < size) {
371 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
372 &elen, &offset);
373
374 if (!fi) {
375 *err = -EIO;
376 goto out_err;
377 }
378
379 liu = le16_to_cpu(cfi->lengthOfImpUse);
380 lfi = cfi->lengthFileIdent;
381
382 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
383 if (((sizeof(struct fileIdentDesc) +
384 liu + lfi + 3) & ~3) == nfidlen) {
385 cfi->descTag.tagSerialNum = cpu_to_le16(1);
386 cfi->fileVersionNum = cpu_to_le16(1);
387 cfi->fileCharacteristics = 0;
388 cfi->lengthFileIdent = namelen;
389 cfi->lengthOfImpUse = cpu_to_le16(0);
390 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
391 name))
392 goto out_ok;
393 else {
394 *err = -EIO;
395 goto out_err;
396 }
397 }
398 }
399 }
400
401add:
402 f_pos += nfidlen;
403
404 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
405 sb->s_blocksize - fibh->eoffset < nfidlen) {
406 brelse(epos.bh);
407 epos.bh = NULL;
408 fibh->soffset -= udf_ext0_offset(dir);
409 fibh->eoffset -= udf_ext0_offset(dir);
410 f_pos -= udf_ext0_offset(dir);
411 if (fibh->sbh != fibh->ebh)
412 brelse(fibh->ebh);
413 brelse(fibh->sbh);
414 fibh->sbh = fibh->ebh =
415 udf_expand_dir_adinicb(dir, &block, err);
416 if (!fibh->sbh)
417 goto out_err;
418 epos.block = dinfo->i_location;
419 epos.offset = udf_file_entry_alloc_offset(dir);
420
421 udf_current_aext(dir, &epos, &eloc, &elen, 1);
422 }
423
424
425 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
426 fibh->soffset = fibh->eoffset;
427 fibh->eoffset += nfidlen;
428 if (fibh->sbh != fibh->ebh) {
429 brelse(fibh->sbh);
430 fibh->sbh = fibh->ebh;
431 }
432
433 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
434 block = dinfo->i_location.logicalBlockNum;
435 fi = (struct fileIdentDesc *)
436 (dinfo->i_ext.i_data +
437 fibh->soffset -
438 udf_ext0_offset(dir) +
439 dinfo->i_lenEAttr);
440 } else {
441 block = eloc.logicalBlockNum +
442 ((elen - 1) >>
443 dir->i_sb->s_blocksize_bits);
444 fi = (struct fileIdentDesc *)
445 (fibh->sbh->b_data + fibh->soffset);
446 }
447 } else {
448
449 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
450 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
451 epos.offset -= sizeof(struct short_ad);
452 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
453 epos.offset -= sizeof(struct long_ad);
454 udf_write_aext(dir, &epos, &eloc, elen, 1);
455 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
456 - 1) & ~(sb->s_blocksize - 1);
457
458 fibh->soffset = fibh->eoffset - sb->s_blocksize;
459 fibh->eoffset += nfidlen - sb->s_blocksize;
460 if (fibh->sbh != fibh->ebh) {
461 brelse(fibh->sbh);
462 fibh->sbh = fibh->ebh;
463 }
464
465 block = eloc.logicalBlockNum + ((elen - 1) >>
466 dir->i_sb->s_blocksize_bits);
467 fibh->ebh = udf_bread(dir,
468 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
469 if (!fibh->ebh)
470 goto out_err;
471
472 brelse(epos.bh);
473 epos.bh = NULL;
474 epos.block = dinfo->i_location;
475 epos.offset = udf_file_entry_alloc_offset(dir);
476
477 if (!fibh->soffset) {
478
479 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
480 (EXT_RECORDED_ALLOCATED >> 30))
481 ;
482 block = eloc.logicalBlockNum + ((elen - 1) >>
483 dir->i_sb->s_blocksize_bits);
484 brelse(fibh->sbh);
485 fibh->sbh = fibh->ebh;
486 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
487 } else {
488 fi = (struct fileIdentDesc *)
489 (fibh->sbh->b_data + sb->s_blocksize +
490 fibh->soffset);
491 }
492 }
493
494 memset(cfi, 0, sizeof(struct fileIdentDesc));
495 if (UDF_SB(sb)->s_udfrev >= 0x0200)
496 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
497 sizeof(struct tag));
498 else
499 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
500 sizeof(struct tag));
501 cfi->fileVersionNum = cpu_to_le16(1);
502 cfi->lengthFileIdent = namelen;
503 cfi->lengthOfImpUse = cpu_to_le16(0);
504 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
505 dir->i_size += nfidlen;
506 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
507 dinfo->i_lenAlloc += nfidlen;
508 else {
509
510 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
511 (EXT_RECORDED_ALLOCATED >> 30))
512 ;
513 elen -= dinfo->i_lenExtents - dir->i_size;
514 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
515 epos.offset -= sizeof(struct short_ad);
516 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
517 epos.offset -= sizeof(struct long_ad);
518 udf_write_aext(dir, &epos, &eloc, elen, 1);
519 dinfo->i_lenExtents = dir->i_size;
520 }
521
522 mark_inode_dirty(dir);
523 goto out_ok;
524 } else {
525 *err = -EIO;
526 goto out_err;
527 }
528
529out_err:
530 fi = NULL;
531 if (fibh->sbh != fibh->ebh)
532 brelse(fibh->ebh);
533 brelse(fibh->sbh);
534out_ok:
535 brelse(epos.bh);
536 kfree(name);
537 return fi;
538}
539
540static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
541 struct udf_fileident_bh *fibh,
542 struct fileIdentDesc *cfi)
543{
544 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
545
546 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
547 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
548
549 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
550}
551
552static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
553{
554 struct udf_inode_info *iinfo = UDF_I(inode);
555 struct inode *dir = dentry->d_parent->d_inode;
556 struct udf_fileident_bh fibh;
557 struct fileIdentDesc cfi, *fi;
558 int err;
559
560 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
561 if (unlikely(!fi)) {
562 inode_dec_link_count(inode);
563 unlock_new_inode(inode);
564 iput(inode);
565 return err;
566 }
567 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
568 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
569 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
570 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
571 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
572 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
573 mark_inode_dirty(dir);
574 if (fibh.sbh != fibh.ebh)
575 brelse(fibh.ebh);
576 brelse(fibh.sbh);
577 unlock_new_inode(inode);
578 d_instantiate(dentry, inode);
579
580 return 0;
581}
582
583static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
584 bool excl)
585{
586 struct inode *inode = udf_new_inode(dir, mode);
587
588 if (IS_ERR(inode))
589 return PTR_ERR(inode);
590
591 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
592 inode->i_data.a_ops = &udf_adinicb_aops;
593 else
594 inode->i_data.a_ops = &udf_aops;
595 inode->i_op = &udf_file_inode_operations;
596 inode->i_fop = &udf_file_operations;
597 mark_inode_dirty(inode);
598
599 return udf_add_nondir(dentry, inode);
600}
601
602static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
603{
604 struct inode *inode = udf_new_inode(dir, mode);
605
606 if (IS_ERR(inode))
607 return PTR_ERR(inode);
608
609 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
610 inode->i_data.a_ops = &udf_adinicb_aops;
611 else
612 inode->i_data.a_ops = &udf_aops;
613 inode->i_op = &udf_file_inode_operations;
614 inode->i_fop = &udf_file_operations;
615 mark_inode_dirty(inode);
616 d_tmpfile(dentry, inode);
617 unlock_new_inode(inode);
618 return 0;
619}
620
621static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
622 dev_t rdev)
623{
624 struct inode *inode;
625
626 if (!old_valid_dev(rdev))
627 return -EINVAL;
628
629 inode = udf_new_inode(dir, mode);
630 if (IS_ERR(inode))
631 return PTR_ERR(inode);
632
633 init_special_inode(inode, mode, rdev);
634 return udf_add_nondir(dentry, inode);
635}
636
637static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
638{
639 struct inode *inode;
640 struct udf_fileident_bh fibh;
641 struct fileIdentDesc cfi, *fi;
642 int err;
643 struct udf_inode_info *dinfo = UDF_I(dir);
644 struct udf_inode_info *iinfo;
645
646 inode = udf_new_inode(dir, S_IFDIR | mode);
647 if (IS_ERR(inode))
648 return PTR_ERR(inode);
649
650 iinfo = UDF_I(inode);
651 inode->i_op = &udf_dir_inode_operations;
652 inode->i_fop = &udf_dir_operations;
653 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
654 if (!fi) {
655 inode_dec_link_count(inode);
656 unlock_new_inode(inode);
657 iput(inode);
658 goto out;
659 }
660 set_nlink(inode, 2);
661 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
662 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
663 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
664 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
665 cfi.fileCharacteristics =
666 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
667 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
668 brelse(fibh.sbh);
669 mark_inode_dirty(inode);
670
671 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
672 if (!fi) {
673 clear_nlink(inode);
674 mark_inode_dirty(inode);
675 unlock_new_inode(inode);
676 iput(inode);
677 goto out;
678 }
679 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
680 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
681 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
682 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
683 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
684 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
685 inc_nlink(dir);
686 mark_inode_dirty(dir);
687 unlock_new_inode(inode);
688 d_instantiate(dentry, inode);
689 if (fibh.sbh != fibh.ebh)
690 brelse(fibh.ebh);
691 brelse(fibh.sbh);
692 err = 0;
693
694out:
695 return err;
696}
697
698static int empty_dir(struct inode *dir)
699{
700 struct fileIdentDesc *fi, cfi;
701 struct udf_fileident_bh fibh;
702 loff_t f_pos;
703 loff_t size = udf_ext0_offset(dir) + dir->i_size;
704 int block;
705 struct kernel_lb_addr eloc;
706 uint32_t elen;
707 sector_t offset;
708 struct extent_position epos = {};
709 struct udf_inode_info *dinfo = UDF_I(dir);
710
711 f_pos = udf_ext0_offset(dir);
712 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
713
714 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
715 fibh.sbh = fibh.ebh = NULL;
716 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
717 &epos, &eloc, &elen, &offset) ==
718 (EXT_RECORDED_ALLOCATED >> 30)) {
719 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
720 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
721 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
722 epos.offset -= sizeof(struct short_ad);
723 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
724 epos.offset -= sizeof(struct long_ad);
725 } else
726 offset = 0;
727
728 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
729 if (!fibh.sbh) {
730 brelse(epos.bh);
731 return 0;
732 }
733 } else {
734 brelse(epos.bh);
735 return 0;
736 }
737
738 while (f_pos < size) {
739 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
740 &elen, &offset);
741 if (!fi) {
742 if (fibh.sbh != fibh.ebh)
743 brelse(fibh.ebh);
744 brelse(fibh.sbh);
745 brelse(epos.bh);
746 return 0;
747 }
748
749 if (cfi.lengthFileIdent &&
750 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
751 if (fibh.sbh != fibh.ebh)
752 brelse(fibh.ebh);
753 brelse(fibh.sbh);
754 brelse(epos.bh);
755 return 0;
756 }
757 }
758
759 if (fibh.sbh != fibh.ebh)
760 brelse(fibh.ebh);
761 brelse(fibh.sbh);
762 brelse(epos.bh);
763
764 return 1;
765}
766
767static int udf_rmdir(struct inode *dir, struct dentry *dentry)
768{
769 int retval;
770 struct inode *inode = dentry->d_inode;
771 struct udf_fileident_bh fibh;
772 struct fileIdentDesc *fi, cfi;
773 struct kernel_lb_addr tloc;
774
775 retval = -ENOENT;
776 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
777 if (!fi)
778 goto out;
779
780 retval = -EIO;
781 tloc = lelb_to_cpu(cfi.icb.extLocation);
782 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
783 goto end_rmdir;
784 retval = -ENOTEMPTY;
785 if (!empty_dir(inode))
786 goto end_rmdir;
787 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
788 if (retval)
789 goto end_rmdir;
790 if (inode->i_nlink != 2)
791 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
792 inode->i_nlink);
793 clear_nlink(inode);
794 inode->i_size = 0;
795 inode_dec_link_count(dir);
796 inode->i_ctime = dir->i_ctime = dir->i_mtime =
797 current_fs_time(dir->i_sb);
798 mark_inode_dirty(dir);
799
800end_rmdir:
801 if (fibh.sbh != fibh.ebh)
802 brelse(fibh.ebh);
803 brelse(fibh.sbh);
804
805out:
806 return retval;
807}
808
809static int udf_unlink(struct inode *dir, struct dentry *dentry)
810{
811 int retval;
812 struct inode *inode = dentry->d_inode;
813 struct udf_fileident_bh fibh;
814 struct fileIdentDesc *fi;
815 struct fileIdentDesc cfi;
816 struct kernel_lb_addr tloc;
817
818 retval = -ENOENT;
819 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
820 if (!fi)
821 goto out;
822
823 retval = -EIO;
824 tloc = lelb_to_cpu(cfi.icb.extLocation);
825 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
826 goto end_unlink;
827
828 if (!inode->i_nlink) {
829 udf_debug("Deleting nonexistent file (%lu), %d\n",
830 inode->i_ino, inode->i_nlink);
831 set_nlink(inode, 1);
832 }
833 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
834 if (retval)
835 goto end_unlink;
836 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
837 mark_inode_dirty(dir);
838 inode_dec_link_count(inode);
839 inode->i_ctime = dir->i_ctime;
840 retval = 0;
841
842end_unlink:
843 if (fibh.sbh != fibh.ebh)
844 brelse(fibh.ebh);
845 brelse(fibh.sbh);
846
847out:
848 return retval;
849}
850
851static int udf_symlink(struct inode *dir, struct dentry *dentry,
852 const char *symname)
853{
854 struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO);
855 struct pathComponent *pc;
856 const char *compstart;
857 struct extent_position epos = {};
858 int eoffset, elen = 0;
859 uint8_t *ea;
860 int err;
861 int block;
862 unsigned char *name = NULL;
863 int namelen;
864 struct udf_inode_info *iinfo;
865 struct super_block *sb = dir->i_sb;
866
867 if (IS_ERR(inode))
868 return PTR_ERR(inode);
869
870 iinfo = UDF_I(inode);
871 down_write(&iinfo->i_data_sem);
872 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
873 if (!name) {
874 err = -ENOMEM;
875 goto out_no_entry;
876 }
877
878 inode->i_data.a_ops = &udf_symlink_aops;
879 inode->i_op = &udf_symlink_inode_operations;
880
881 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
882 struct kernel_lb_addr eloc;
883 uint32_t bsize;
884
885 block = udf_new_block(sb, inode,
886 iinfo->i_location.partitionReferenceNum,
887 iinfo->i_location.logicalBlockNum, &err);
888 if (!block)
889 goto out_no_entry;
890 epos.block = iinfo->i_location;
891 epos.offset = udf_file_entry_alloc_offset(inode);
892 epos.bh = NULL;
893 eloc.logicalBlockNum = block;
894 eloc.partitionReferenceNum =
895 iinfo->i_location.partitionReferenceNum;
896 bsize = sb->s_blocksize;
897 iinfo->i_lenExtents = bsize;
898 udf_add_aext(inode, &epos, &eloc, bsize, 0);
899 brelse(epos.bh);
900
901 block = udf_get_pblock(sb, block,
902 iinfo->i_location.partitionReferenceNum,
903 0);
904 epos.bh = udf_tgetblk(sb, block);
905 lock_buffer(epos.bh);
906 memset(epos.bh->b_data, 0x00, bsize);
907 set_buffer_uptodate(epos.bh);
908 unlock_buffer(epos.bh);
909 mark_buffer_dirty_inode(epos.bh, inode);
910 ea = epos.bh->b_data + udf_ext0_offset(inode);
911 } else
912 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
913
914 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
915 pc = (struct pathComponent *)ea;
916
917 if (*symname == '/') {
918 do {
919 symname++;
920 } while (*symname == '/');
921
922 pc->componentType = 1;
923 pc->lengthComponentIdent = 0;
924 pc->componentFileVersionNum = 0;
925 elen += sizeof(struct pathComponent);
926 }
927
928 err = -ENAMETOOLONG;
929
930 while (*symname) {
931 if (elen + sizeof(struct pathComponent) > eoffset)
932 goto out_no_entry;
933
934 pc = (struct pathComponent *)(ea + elen);
935
936 compstart = symname;
937
938 do {
939 symname++;
940 } while (*symname && *symname != '/');
941
942 pc->componentType = 5;
943 pc->lengthComponentIdent = 0;
944 pc->componentFileVersionNum = 0;
945 if (compstart[0] == '.') {
946 if ((symname - compstart) == 1)
947 pc->componentType = 4;
948 else if ((symname - compstart) == 2 &&
949 compstart[1] == '.')
950 pc->componentType = 3;
951 }
952
953 if (pc->componentType == 5) {
954 namelen = udf_put_filename(sb, compstart, name,
955 symname - compstart);
956 if (!namelen)
957 goto out_no_entry;
958
959 if (elen + sizeof(struct pathComponent) + namelen >
960 eoffset)
961 goto out_no_entry;
962 else
963 pc->lengthComponentIdent = namelen;
964
965 memcpy(pc->componentIdent, name, namelen);
966 }
967
968 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
969
970 if (*symname) {
971 do {
972 symname++;
973 } while (*symname == '/');
974 }
975 }
976
977 brelse(epos.bh);
978 inode->i_size = elen;
979 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
980 iinfo->i_lenAlloc = inode->i_size;
981 else
982 udf_truncate_tail_extent(inode);
983 mark_inode_dirty(inode);
984 up_write(&iinfo->i_data_sem);
985
986 err = udf_add_nondir(dentry, inode);
987out:
988 kfree(name);
989 return err;
990
991out_no_entry:
992 up_write(&iinfo->i_data_sem);
993 inode_dec_link_count(inode);
994 unlock_new_inode(inode);
995 iput(inode);
996 goto out;
997}
998
999static int udf_link(struct dentry *old_dentry, struct inode *dir,
1000 struct dentry *dentry)
1001{
1002 struct inode *inode = old_dentry->d_inode;
1003 struct udf_fileident_bh fibh;
1004 struct fileIdentDesc cfi, *fi;
1005 int err;
1006
1007 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1008 if (!fi) {
1009 return err;
1010 }
1011 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1012 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1013 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1014 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1015 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1016 }
1017 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1018 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1019 mark_inode_dirty(dir);
1020
1021 if (fibh.sbh != fibh.ebh)
1022 brelse(fibh.ebh);
1023 brelse(fibh.sbh);
1024 inc_nlink(inode);
1025 inode->i_ctime = current_fs_time(inode->i_sb);
1026 mark_inode_dirty(inode);
1027 ihold(inode);
1028 d_instantiate(dentry, inode);
1029
1030 return 0;
1031}
1032
1033
1034
1035
1036static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1037 struct inode *new_dir, struct dentry *new_dentry)
1038{
1039 struct inode *old_inode = old_dentry->d_inode;
1040 struct inode *new_inode = new_dentry->d_inode;
1041 struct udf_fileident_bh ofibh, nfibh;
1042 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1043 struct fileIdentDesc ocfi, ncfi;
1044 struct buffer_head *dir_bh = NULL;
1045 int retval = -ENOENT;
1046 struct kernel_lb_addr tloc;
1047 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1048
1049 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1050 if (ofi) {
1051 if (ofibh.sbh != ofibh.ebh)
1052 brelse(ofibh.ebh);
1053 brelse(ofibh.sbh);
1054 }
1055 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1056 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1057 != old_inode->i_ino)
1058 goto end_rename;
1059
1060 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1061 if (nfi) {
1062 if (!new_inode) {
1063 if (nfibh.sbh != nfibh.ebh)
1064 brelse(nfibh.ebh);
1065 brelse(nfibh.sbh);
1066 nfi = NULL;
1067 }
1068 }
1069 if (S_ISDIR(old_inode->i_mode)) {
1070 int offset = udf_ext0_offset(old_inode);
1071
1072 if (new_inode) {
1073 retval = -ENOTEMPTY;
1074 if (!empty_dir(new_inode))
1075 goto end_rename;
1076 }
1077 retval = -EIO;
1078 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1079 dir_fi = udf_get_fileident(
1080 old_iinfo->i_ext.i_data -
1081 (old_iinfo->i_efe ?
1082 sizeof(struct extendedFileEntry) :
1083 sizeof(struct fileEntry)),
1084 old_inode->i_sb->s_blocksize, &offset);
1085 } else {
1086 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1087 if (!dir_bh)
1088 goto end_rename;
1089 dir_fi = udf_get_fileident(dir_bh->b_data,
1090 old_inode->i_sb->s_blocksize, &offset);
1091 }
1092 if (!dir_fi)
1093 goto end_rename;
1094 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1095 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1096 old_dir->i_ino)
1097 goto end_rename;
1098 }
1099 if (!nfi) {
1100 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1101 &retval);
1102 if (!nfi)
1103 goto end_rename;
1104 }
1105
1106
1107
1108
1109
1110 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1111 mark_inode_dirty(old_inode);
1112
1113
1114
1115
1116 ncfi.fileVersionNum = ocfi.fileVersionNum;
1117 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1118 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1119 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1120
1121
1122 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1123 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1124
1125 if (new_inode) {
1126 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1127 inode_dec_link_count(new_inode);
1128 }
1129 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1130 mark_inode_dirty(old_dir);
1131
1132 if (dir_fi) {
1133 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1134 udf_update_tag((char *)dir_fi,
1135 (sizeof(struct fileIdentDesc) +
1136 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1137 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1138 mark_inode_dirty(old_inode);
1139 else
1140 mark_buffer_dirty_inode(dir_bh, old_inode);
1141
1142 inode_dec_link_count(old_dir);
1143 if (new_inode)
1144 inode_dec_link_count(new_inode);
1145 else {
1146 inc_nlink(new_dir);
1147 mark_inode_dirty(new_dir);
1148 }
1149 }
1150
1151 if (ofi) {
1152 if (ofibh.sbh != ofibh.ebh)
1153 brelse(ofibh.ebh);
1154 brelse(ofibh.sbh);
1155 }
1156
1157 retval = 0;
1158
1159end_rename:
1160 brelse(dir_bh);
1161 if (nfi) {
1162 if (nfibh.sbh != nfibh.ebh)
1163 brelse(nfibh.ebh);
1164 brelse(nfibh.sbh);
1165 }
1166
1167 return retval;
1168}
1169
1170static struct dentry *udf_get_parent(struct dentry *child)
1171{
1172 struct kernel_lb_addr tloc;
1173 struct inode *inode = NULL;
1174 struct qstr dotdot = QSTR_INIT("..", 2);
1175 struct fileIdentDesc cfi;
1176 struct udf_fileident_bh fibh;
1177
1178 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1179 return ERR_PTR(-EACCES);
1180
1181 if (fibh.sbh != fibh.ebh)
1182 brelse(fibh.ebh);
1183 brelse(fibh.sbh);
1184
1185 tloc = lelb_to_cpu(cfi.icb.extLocation);
1186 inode = udf_iget(child->d_inode->i_sb, &tloc);
1187 if (IS_ERR(inode))
1188 return ERR_CAST(inode);
1189
1190 return d_obtain_alias(inode);
1191}
1192
1193
1194static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1195 u16 partref, __u32 generation)
1196{
1197 struct inode *inode;
1198 struct kernel_lb_addr loc;
1199
1200 if (block == 0)
1201 return ERR_PTR(-ESTALE);
1202
1203 loc.logicalBlockNum = block;
1204 loc.partitionReferenceNum = partref;
1205 inode = udf_iget(sb, &loc);
1206
1207 if (IS_ERR(inode))
1208 return ERR_CAST(inode);
1209
1210 if (generation && inode->i_generation != generation) {
1211 iput(inode);
1212 return ERR_PTR(-ESTALE);
1213 }
1214 return d_obtain_alias(inode);
1215}
1216
1217static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1218 struct fid *fid, int fh_len, int fh_type)
1219{
1220 if ((fh_len != 3 && fh_len != 5) ||
1221 (fh_type != FILEID_UDF_WITH_PARENT &&
1222 fh_type != FILEID_UDF_WITHOUT_PARENT))
1223 return NULL;
1224
1225 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1226 fid->udf.generation);
1227}
1228
1229static struct dentry *udf_fh_to_parent(struct super_block *sb,
1230 struct fid *fid, int fh_len, int fh_type)
1231{
1232 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1233 return NULL;
1234
1235 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1236 fid->udf.parent_partref,
1237 fid->udf.parent_generation);
1238}
1239static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1240 struct inode *parent)
1241{
1242 int len = *lenp;
1243 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1244 struct fid *fid = (struct fid *)fh;
1245 int type = FILEID_UDF_WITHOUT_PARENT;
1246
1247 if (parent && (len < 5)) {
1248 *lenp = 5;
1249 return FILEID_INVALID;
1250 } else if (len < 3) {
1251 *lenp = 3;
1252 return FILEID_INVALID;
1253 }
1254
1255 *lenp = 3;
1256 fid->udf.block = location.logicalBlockNum;
1257 fid->udf.partref = location.partitionReferenceNum;
1258 fid->udf.parent_partref = 0;
1259 fid->udf.generation = inode->i_generation;
1260
1261 if (parent) {
1262 location = UDF_I(parent)->i_location;
1263 fid->udf.parent_block = location.logicalBlockNum;
1264 fid->udf.parent_partref = location.partitionReferenceNum;
1265 fid->udf.parent_generation = inode->i_generation;
1266 *lenp = 5;
1267 type = FILEID_UDF_WITH_PARENT;
1268 }
1269
1270 return type;
1271}
1272
1273const struct export_operations udf_export_ops = {
1274 .encode_fh = udf_encode_fh,
1275 .fh_to_dentry = udf_fh_to_dentry,
1276 .fh_to_parent = udf_fh_to_parent,
1277 .get_parent = udf_get_parent,
1278};
1279
1280const struct inode_operations udf_dir_inode_operations = {
1281 .lookup = udf_lookup,
1282 .create = udf_create,
1283 .link = udf_link,
1284 .unlink = udf_unlink,
1285 .symlink = udf_symlink,
1286 .mkdir = udf_mkdir,
1287 .rmdir = udf_rmdir,
1288 .mknod = udf_mknod,
1289 .rename = udf_rename,
1290 .tmpfile = udf_tmpfile,
1291};
1292const struct inode_operations udf_symlink_inode_operations = {
1293 .readlink = generic_readlink,
1294 .follow_link = page_follow_link_light,
1295 .put_link = page_put_link,
1296};
1297
