1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * namei.c
4 *
5 * PURPOSE
6 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
7 *
8 * COPYRIGHT
9 * (C) 1998-2004 Ben Fennema
10 * (C) 1999-2000 Stelias Computing Inc
11 *
12 * HISTORY
13 *
14 * 12/12/98 blf Created. Split out the lookup code from dir.c
15 * 04/19/99 blf link, mknod, symlink support
16 */
17
18 #include "udfdecl.h"
19
20 #include "udf_i.h"
21 #include "udf_sb.h"
22 #include <linux/string.h>
23 #include <linux/errno.h>
24 #include <linux/mm.h>
25 #include <linux/slab.h>
26 #include <linux/sched.h>
27 #include <linux/crc-itu-t.h>
28 #include <linux/exportfs.h>
29 #include <linux/iversion.h>
30
31 static inline int udf_match(int len1, const unsigned char *name1, int len2,
32 const unsigned char *name2)
33 {
34 if (len1 != len2)
35 return 0;
36
37 return !memcmp(name1, name2, len1);
38 }
39
40 /**
41 * udf_fiiter_find_entry - find entry in given directory.
42 *
43 * @dir: directory inode to search in
44 * @child: qstr of the name
45 * @iter: iter to use for searching
46 *
47 * This function searches in the directory @dir for a file name @child. When
48 * found, @iter points to the position in the directory with given entry.
49 *
50 * Returns 0 on success, < 0 on error (including -ENOENT).
51 */
52 static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
53 struct udf_fileident_iter *iter)
54 {
55 int flen;
56 unsigned char *fname = NULL;
57 struct super_block *sb = dir->i_sb;
58 int isdotdot = child->len == 2 &&
59 child->name[0] == '.' && child->name[1] == '.';
60 int ret;
61
62 fname = kmalloc(UDF_NAME_LEN, GFP_KERNEL);
63 if (!fname)
64 return -ENOMEM;
65
66 for (ret = udf_fiiter_init(iter, dir, 0);
67 !ret && iter->pos < dir->i_size;
68 ret = udf_fiiter_advance(iter)) {
69 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
70 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
71 continue;
72 }
73
74 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
75 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
76 continue;
77 }
78
79 if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
80 isdotdot)
81 goto out_ok;
82
83 if (!iter->fi.lengthFileIdent)
84 continue;
85
86 flen = udf_get_filename(sb, iter->name,
87 iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
88 if (flen < 0) {
89 ret = flen;
90 goto out_err;
91 }
92
93 if (udf_match(flen, fname, child->len, child->name))
94 goto out_ok;
95 }
96 if (!ret)
97 ret = -ENOENT;
98
99 out_err:
100 udf_fiiter_release(iter);
101 out_ok:
102 kfree(fname);
103
104 return ret;
105 }
106
107 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
108 unsigned int flags)
109 {
110 struct inode *inode = NULL;
111 struct udf_fileident_iter iter;
112 int err;
113
114 if (dentry->d_name.len > UDF_NAME_LEN)
115 return ERR_PTR(-ENAMETOOLONG);
116
117 err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
118 if (err < 0 && err != -ENOENT)
119 return ERR_PTR(err);
120
121 if (err == 0) {
122 struct kernel_lb_addr loc;
123
124 loc = lelb_to_cpu(iter.fi.icb.extLocation);
125 udf_fiiter_release(&iter);
126
127 inode = udf_iget(dir->i_sb, &loc);
128 }
129
130 return d_splice_alias(inode, dentry);
131 }
132
133 static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
134 {
135 udf_pblk_t newblock;
136 struct buffer_head *dbh = NULL;
137 struct kernel_lb_addr eloc;
138 struct extent_position epos;
139 uint8_t alloctype;
140 struct udf_inode_info *iinfo = UDF_I(inode);
141 struct udf_fileident_iter iter;
142 uint8_t *impuse;
143 int ret;
144
145 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
146 alloctype = ICBTAG_FLAG_AD_SHORT;
147 else
148 alloctype = ICBTAG_FLAG_AD_LONG;
149
150 if (!inode->i_size) {
151 iinfo->i_alloc_type = alloctype;
152 mark_inode_dirty(inode);
153 return 0;
154 }
155
156 /* alloc block, and copy data to it */
157 *block = udf_new_block(inode->i_sb, inode,
158 iinfo->i_location.partitionReferenceNum,
159 iinfo->i_location.logicalBlockNum, &ret);
160 if (!(*block))
161 return ret;
162 newblock = udf_get_pblock(inode->i_sb, *block,
163 iinfo->i_location.partitionReferenceNum,
164 0);
165 if (newblock == 0xffffffff)
166 return -EFSCORRUPTED;
167 dbh = sb_getblk(inode->i_sb, newblock);
168 if (!dbh)
169 return -ENOMEM;
170 lock_buffer(dbh);
171 memcpy(dbh->b_data, iinfo->i_data, inode->i_size);
172 memset(dbh->b_data + inode->i_size, 0,
173 inode->i_sb->s_blocksize - inode->i_size);
174 set_buffer_uptodate(dbh);
175 unlock_buffer(dbh);
176
177 /* Drop inline data, add block instead */
178 iinfo->i_alloc_type = alloctype;
179 memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
180 iinfo->i_lenAlloc = 0;
181 eloc.logicalBlockNum = *block;
182 eloc.partitionReferenceNum =
183 iinfo->i_location.partitionReferenceNum;
184 iinfo->i_lenExtents = inode->i_size;
185 epos.bh = NULL;
186 epos.block = iinfo->i_location;
187 epos.offset = udf_file_entry_alloc_offset(inode);
188 ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
189 brelse(epos.bh);
190 if (ret < 0) {
191 brelse(dbh);
192 udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1);
193 return ret;
194 }
195 mark_inode_dirty(inode);
196
197 /* Now fixup tags in moved directory entries */
198 for (ret = udf_fiiter_init(&iter, inode, 0);
199 !ret && iter.pos < inode->i_size;
200 ret = udf_fiiter_advance(&iter)) {
201 iter.fi.descTag.tagLocation = cpu_to_le32(*block);
202 if (iter.fi.lengthOfImpUse != cpu_to_le16(0))
203 impuse = dbh->b_data + iter.pos +
204 sizeof(struct fileIdentDesc);
205 else
206 impuse = NULL;
207 udf_fiiter_write_fi(&iter, impuse);
208 }
209 brelse(dbh);
210 /*
211 * We don't expect the iteration to fail as the directory has been
212 * already verified to be correct
213 */
214 WARN_ON_ONCE(ret);
215 udf_fiiter_release(&iter);
216
217 return 0;
218 }
219
220 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
221 struct udf_fileident_iter *iter)
222 {
223 struct udf_inode_info *dinfo = UDF_I(dir);
224 int nfidlen, namelen = 0;
225 int ret;
226 int off, blksize = 1 << dir->i_blkbits;
227 udf_pblk_t block;
228 char name[UDF_NAME_LEN_CS0];
229
230 if (dentry) {
231 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
232 dentry->d_name.len,
233 name, UDF_NAME_LEN_CS0);
234 if (!namelen)
235 return -ENAMETOOLONG;
236 }
237 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
238
239 for (ret = udf_fiiter_init(iter, dir, 0);
240 !ret && iter->pos < dir->i_size;
241 ret = udf_fiiter_advance(iter)) {
242 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
243 if (udf_dir_entry_len(&iter->fi) == nfidlen) {
244 iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
245 iter->fi.fileVersionNum = cpu_to_le16(1);
246 iter->fi.fileCharacteristics = 0;
247 iter->fi.lengthFileIdent = namelen;
248 iter->fi.lengthOfImpUse = cpu_to_le16(0);
249 memcpy(iter->namebuf, name, namelen);
250 iter->name = iter->namebuf;
251 return 0;
252 }
253 }
254 }
255 if (ret) {
256 udf_fiiter_release(iter);
257 return ret;
258 }
259 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
260 blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
261 udf_fiiter_release(iter);
262 ret = udf_expand_dir_adinicb(dir, &block);
263 if (ret)
264 return ret;
265 ret = udf_fiiter_init(iter, dir, dir->i_size);
266 if (ret < 0)
267 return ret;
268 }
269
270 /* Get blocknumber to use for entry tag */
271 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
272 block = dinfo->i_location.logicalBlockNum;
273 } else {
274 block = iter->eloc.logicalBlockNum +
275 ((iter->elen - 1) >> dir->i_blkbits);
276 }
277 off = iter->pos & (blksize - 1);
278 if (!off)
279 off = blksize;
280 /* Entry fits into current block? */
281 if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
282 goto store_fi;
283
284 ret = udf_fiiter_append_blk(iter);
285 if (ret) {
286 udf_fiiter_release(iter);
287 return ret;
288 }
289
290 /* Entry will be completely in the new block? Update tag location... */
291 if (!(iter->pos & (blksize - 1)))
292 block = iter->eloc.logicalBlockNum +
293 ((iter->elen - 1) >> dir->i_blkbits);
294 store_fi:
295 memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
296 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
297 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
298 sizeof(struct tag));
299 else
300 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
301 sizeof(struct tag));
302 iter->fi.fileVersionNum = cpu_to_le16(1);
303 iter->fi.lengthFileIdent = namelen;
304 iter->fi.lengthOfImpUse = cpu_to_le16(0);
305 memcpy(iter->namebuf, name, namelen);
306 iter->name = iter->namebuf;
307
308 dir->i_size += nfidlen;
309 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
310 dinfo->i_lenAlloc += nfidlen;
311 } else {
312 /* Truncate last extent to proper size */
313 udf_fiiter_update_elen(iter, iter->elen -
314 (dinfo->i_lenExtents - dir->i_size));
315 }
316 mark_inode_dirty(dir);
317
318 return 0;
319 }
320
321 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter)
322 {
323 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED;
324
325 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT))
326 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad));
327
328 udf_fiiter_write_fi(iter, NULL);
329 }
330
331 static void udf_add_fid_counter(struct super_block *sb, bool dir, int val)
332 {
333 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
334
335 if (!lvidiu)
336 return;
337 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
338 if (dir)
339 le32_add_cpu(&lvidiu->numDirs, val);
340 else
341 le32_add_cpu(&lvidiu->numFiles, val);
342 udf_updated_lvid(sb);
343 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
344 }
345
346 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
347 {
348 struct udf_inode_info *iinfo = UDF_I(inode);
349 struct inode *dir = d_inode(dentry->d_parent);
350 struct udf_fileident_iter iter;
351 int err;
352
353 err = udf_fiiter_add_entry(dir, dentry, &iter);
354 if (err) {
355 inode_dec_link_count(inode);
356 discard_new_inode(inode);
357 return err;
358 }
359 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
360 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
361 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
362 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
363 udf_fiiter_write_fi(&iter, NULL);
364 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
365 mark_inode_dirty(dir);
366 udf_fiiter_release(&iter);
367 udf_add_fid_counter(dir->i_sb, false, 1);
368 d_instantiate_new(dentry, inode);
369
370 return 0;
371 }
372
373 static int udf_create(struct mnt_idmap *idmap, struct inode *dir,
374 struct dentry *dentry, umode_t mode, bool excl)
375 {
376 struct inode *inode = udf_new_inode(dir, mode);
377
378 if (IS_ERR(inode))
379 return PTR_ERR(inode);
380
381 inode->i_data.a_ops = &udf_aops;
382 inode->i_op = &udf_file_inode_operations;
383 inode->i_fop = &udf_file_operations;
384 mark_inode_dirty(inode);
385
386 return udf_add_nondir(dentry, inode);
387 }
388
389 static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
390 struct file *file, umode_t mode)
391 {
392 struct inode *inode = udf_new_inode(dir, mode);
393
394 if (IS_ERR(inode))
395 return PTR_ERR(inode);
396
397 inode->i_data.a_ops = &udf_aops;
398 inode->i_op = &udf_file_inode_operations;
399 inode->i_fop = &udf_file_operations;
400 mark_inode_dirty(inode);
401 d_tmpfile(file, inode);
402 unlock_new_inode(inode);
403 return finish_open_simple(file, 0);
404 }
405
406 static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir,
407 struct dentry *dentry, umode_t mode, dev_t rdev)
408 {
409 struct inode *inode;
410
411 if (!old_valid_dev(rdev))
412 return -EINVAL;
413
414 inode = udf_new_inode(dir, mode);
415 if (IS_ERR(inode))
416 return PTR_ERR(inode);
417
418 init_special_inode(inode, mode, rdev);
419 return udf_add_nondir(dentry, inode);
420 }
421
422 static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir,
423 struct dentry *dentry, umode_t mode)
424 {
425 struct inode *inode;
426 struct udf_fileident_iter iter;
427 int err;
428 struct udf_inode_info *dinfo = UDF_I(dir);
429 struct udf_inode_info *iinfo;
430
431 inode = udf_new_inode(dir, S_IFDIR | mode);
432 if (IS_ERR(inode))
433 return PTR_ERR(inode);
434
435 iinfo = UDF_I(inode);
436 inode->i_op = &udf_dir_inode_operations;
437 inode->i_fop = &udf_dir_operations;
438 err = udf_fiiter_add_entry(inode, NULL, &iter);
439 if (err) {
440 clear_nlink(inode);
441 discard_new_inode(inode);
442 return err;
443 }
444 set_nlink(inode, 2);
445 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
446 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
447 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
448 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
449 iter.fi.fileCharacteristics =
450 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
451 udf_fiiter_write_fi(&iter, NULL);
452 udf_fiiter_release(&iter);
453 mark_inode_dirty(inode);
454
455 err = udf_fiiter_add_entry(dir, dentry, &iter);
456 if (err) {
457 clear_nlink(inode);
458 discard_new_inode(inode);
459 return err;
460 }
461 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
462 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
463 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
464 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
465 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
466 udf_fiiter_write_fi(&iter, NULL);
467 udf_fiiter_release(&iter);
468 udf_add_fid_counter(dir->i_sb, true, 1);
469 inc_nlink(dir);
470 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
471 mark_inode_dirty(dir);
472 d_instantiate_new(dentry, inode);
473
474 return 0;
475 }
476
477 static int empty_dir(struct inode *dir)
478 {
479 struct udf_fileident_iter iter;
480 int ret;
481
482 for (ret = udf_fiiter_init(&iter, dir, 0);
483 !ret && iter.pos < dir->i_size;
484 ret = udf_fiiter_advance(&iter)) {
485 if (iter.fi.lengthFileIdent &&
486 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) {
487 udf_fiiter_release(&iter);
488 return 0;
489 }
490 }
491 udf_fiiter_release(&iter);
492
493 return 1;
494 }
495
496 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
497 {
498 int ret;
499 struct inode *inode = d_inode(dentry);
500 struct udf_fileident_iter iter;
501 struct kernel_lb_addr tloc;
502
503 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
504 if (ret)
505 goto out;
506
507 ret = -EFSCORRUPTED;
508 tloc = lelb_to_cpu(iter.fi.icb.extLocation);
509 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
510 goto end_rmdir;
511 ret = -ENOTEMPTY;
512 if (!empty_dir(inode))
513 goto end_rmdir;
514 udf_fiiter_delete_entry(&iter);
515 if (inode->i_nlink != 2)
516 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
517 inode->i_nlink);
518 clear_nlink(inode);
519 inode->i_size = 0;
520 inode_dec_link_count(dir);
521 udf_add_fid_counter(dir->i_sb, true, -1);
522 inode_set_mtime_to_ts(dir,
523 inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode)));
524 mark_inode_dirty(dir);
525 ret = 0;
526 end_rmdir:
527 udf_fiiter_release(&iter);
528 out:
529 return ret;
530 }
531
532 static int udf_unlink(struct inode *dir, struct dentry *dentry)
533 {
534 int ret;
535 struct inode *inode = d_inode(dentry);
536 struct udf_fileident_iter iter;
537 struct kernel_lb_addr tloc;
538
539 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
540 if (ret)
541 goto out;
542
543 ret = -EFSCORRUPTED;
544 tloc = lelb_to_cpu(iter.fi.icb.extLocation);
545 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
546 goto end_unlink;
547
548 if (!inode->i_nlink) {
549 udf_debug("Deleting nonexistent file (%lu), %u\n",
550 inode->i_ino, inode->i_nlink);
551 set_nlink(inode, 1);
552 }
553 udf_fiiter_delete_entry(&iter);
554 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
555 mark_inode_dirty(dir);
556 inode_dec_link_count(inode);
557 udf_add_fid_counter(dir->i_sb, false, -1);
558 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
559 ret = 0;
560 end_unlink:
561 udf_fiiter_release(&iter);
562 out:
563 return ret;
564 }
565
566 static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
567 struct dentry *dentry, const char *symname)
568 {
569 struct inode *inode;
570 struct pathComponent *pc;
571 const char *compstart;
572 struct extent_position epos = {};
573 int eoffset, elen = 0;
574 uint8_t *ea;
575 int err;
576 udf_pblk_t block;
577 unsigned char *name = NULL;
578 int namelen;
579 struct udf_inode_info *iinfo;
580 struct super_block *sb = dir->i_sb;
581
582 name = kmalloc(UDF_NAME_LEN_CS0, GFP_KERNEL);
583 if (!name) {
584 err = -ENOMEM;
585 goto out;
586 }
587
588 inode = udf_new_inode(dir, S_IFLNK | 0777);
589 if (IS_ERR(inode)) {
590 err = PTR_ERR(inode);
591 goto out;
592 }
593
594 iinfo = UDF_I(inode);
595 down_write(&iinfo->i_data_sem);
596 inode->i_data.a_ops = &udf_symlink_aops;
597 inode->i_op = &udf_symlink_inode_operations;
598 inode_nohighmem(inode);
599
600 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
601 struct kernel_lb_addr eloc;
602 uint32_t bsize;
603
604 block = udf_new_block(sb, inode,
605 iinfo->i_location.partitionReferenceNum,
606 iinfo->i_location.logicalBlockNum, &err);
607 if (!block)
608 goto out_no_entry;
609 epos.block = iinfo->i_location;
610 epos.offset = udf_file_entry_alloc_offset(inode);
611 epos.bh = NULL;
612 eloc.logicalBlockNum = block;
613 eloc.partitionReferenceNum =
614 iinfo->i_location.partitionReferenceNum;
615 bsize = sb->s_blocksize;
616 iinfo->i_lenExtents = bsize;
617 err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
618 brelse(epos.bh);
619 if (err < 0) {
620 udf_free_blocks(sb, inode, &eloc, 0, 1);
621 goto out_no_entry;
622 }
623
624 block = udf_get_pblock(sb, block,
625 iinfo->i_location.partitionReferenceNum,
626 0);
627 epos.bh = sb_getblk(sb, block);
628 if (unlikely(!epos.bh)) {
629 err = -ENOMEM;
630 udf_free_blocks(sb, inode, &eloc, 0, 1);
631 goto out_no_entry;
632 }
633 lock_buffer(epos.bh);
634 memset(epos.bh->b_data, 0x00, bsize);
635 set_buffer_uptodate(epos.bh);
636 unlock_buffer(epos.bh);
637 mark_buffer_dirty_inode(epos.bh, inode);
638 ea = epos.bh->b_data + udf_ext0_offset(inode);
639 } else
640 ea = iinfo->i_data + iinfo->i_lenEAttr;
641
642 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
643 pc = (struct pathComponent *)ea;
644
645 if (*symname == '/') {
646 do {
647 symname++;
648 } while (*symname == '/');
649
650 pc->componentType = 1;
651 pc->lengthComponentIdent = 0;
652 pc->componentFileVersionNum = 0;
653 elen += sizeof(struct pathComponent);
654 }
655
656 err = -ENAMETOOLONG;
657
658 while (*symname) {
659 if (elen + sizeof(struct pathComponent) > eoffset)
660 goto out_no_entry;
661
662 pc = (struct pathComponent *)(ea + elen);
663
664 compstart = symname;
665
666 do {
667 symname++;
668 } while (*symname && *symname != '/');
669
670 pc->componentType = 5;
671 pc->lengthComponentIdent = 0;
672 pc->componentFileVersionNum = 0;
673 if (compstart[0] == '.') {
674 if ((symname - compstart) == 1)
675 pc->componentType = 4;
676 else if ((symname - compstart) == 2 &&
677 compstart[1] == '.')
678 pc->componentType = 3;
679 }
680
681 if (pc->componentType == 5) {
682 namelen = udf_put_filename(sb, compstart,
683 symname - compstart,
684 name, UDF_NAME_LEN_CS0);
685 if (!namelen)
686 goto out_no_entry;
687
688 if (elen + sizeof(struct pathComponent) + namelen >
689 eoffset)
690 goto out_no_entry;
691 else
692 pc->lengthComponentIdent = namelen;
693
694 memcpy(pc->componentIdent, name, namelen);
695 }
696
697 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
698
699 if (*symname) {
700 do {
701 symname++;
702 } while (*symname == '/');
703 }
704 }
705
706 brelse(epos.bh);
707 inode->i_size = elen;
708 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
709 iinfo->i_lenAlloc = inode->i_size;
710 else
711 udf_truncate_tail_extent(inode);
712 mark_inode_dirty(inode);
713 up_write(&iinfo->i_data_sem);
714
715 err = udf_add_nondir(dentry, inode);
716 out:
717 kfree(name);
718 return err;
719
720 out_no_entry:
721 up_write(&iinfo->i_data_sem);
722 inode_dec_link_count(inode);
723 discard_new_inode(inode);
724 goto out;
725 }
726
727 static int udf_link(struct dentry *old_dentry, struct inode *dir,
728 struct dentry *dentry)
729 {
730 struct inode *inode = d_inode(old_dentry);
731 struct udf_fileident_iter iter;
732 int err;
733
734 err = udf_fiiter_add_entry(dir, dentry, &iter);
735 if (err)
736 return err;
737 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
738 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
739 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
740 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
741 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
742 }
743 udf_fiiter_write_fi(&iter, NULL);
744 udf_fiiter_release(&iter);
745
746 inc_nlink(inode);
747 udf_add_fid_counter(dir->i_sb, false, 1);
748 inode_set_ctime_current(inode);
749 mark_inode_dirty(inode);
750 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
751 mark_inode_dirty(dir);
752 ihold(inode);
753 d_instantiate(dentry, inode);
754
755 return 0;
756 }
757
758 /* Anybody can rename anything with this: the permission checks are left to the
759 * higher-level routines.
760 */
761 static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
762 struct dentry *old_dentry, struct inode *new_dir,
763 struct dentry *new_dentry, unsigned int flags)
764 {
765 struct inode *old_inode = d_inode(old_dentry);
766 struct inode *new_inode = d_inode(new_dentry);
767 struct udf_fileident_iter oiter, niter, diriter;
768 bool has_diriter = false, is_dir = false;
769 int retval;
770 struct kernel_lb_addr tloc;
771
772 if (flags & ~RENAME_NOREPLACE)
773 return -EINVAL;
774
775 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
776 if (retval)
777 return retval;
778
779 tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
780 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
781 retval = -ENOENT;
782 goto out_oiter;
783 }
784
785 if (S_ISDIR(old_inode->i_mode)) {
786 if (new_inode) {
787 retval = -ENOTEMPTY;
788 if (!empty_dir(new_inode))
789 goto out_oiter;
790 }
791 is_dir = true;
792 }
793 if (is_dir && old_dir != new_dir) {
794 retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
795 &diriter);
796 if (retval == -ENOENT) {
797 udf_err(old_inode->i_sb,
798 "directory (ino %lu) has no '..' entry\n",
799 old_inode->i_ino);
800 retval = -EFSCORRUPTED;
801 }
802 if (retval)
803 goto out_oiter;
804 has_diriter = true;
805 tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
806 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
807 old_dir->i_ino) {
808 retval = -EFSCORRUPTED;
809 udf_err(old_inode->i_sb,
810 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
811 old_inode->i_ino, old_dir->i_ino,
812 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
813 goto out_oiter;
814 }
815 }
816
817 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
818 if (retval && retval != -ENOENT)
819 goto out_oiter;
820 /* Entry found but not passed by VFS? */
821 if (!retval && !new_inode) {
822 retval = -EFSCORRUPTED;
823 udf_fiiter_release(&niter);
824 goto out_oiter;
825 }
826 /* Entry not found? Need to add one... */
827 if (retval) {
828 udf_fiiter_release(&niter);
829 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
830 if (retval)
831 goto out_oiter;
832 }
833
834 /*
835 * Like most other Unix systems, set the ctime for inodes on a
836 * rename.
837 */
838 inode_set_ctime_current(old_inode);
839 mark_inode_dirty(old_inode);
840
841 /*
842 * ok, that's it
843 */
844 niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
845 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
846 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
847 udf_fiiter_write_fi(&niter, NULL);
848 udf_fiiter_release(&niter);
849
850 /*
851 * The old entry may have moved due to new entry allocation. Find it
852 * again.
853 */
854 udf_fiiter_release(&oiter);
855 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
856 if (retval) {
857 udf_err(old_dir->i_sb,
858 "failed to find renamed entry again in directory (ino %lu)\n",
859 old_dir->i_ino);
860 } else {
861 udf_fiiter_delete_entry(&oiter);
862 udf_fiiter_release(&oiter);
863 }
864
865 if (new_inode) {
866 inode_set_ctime_current(new_inode);
867 inode_dec_link_count(new_inode);
868 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
869 -1);
870 }
871 inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
872 inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
873 mark_inode_dirty(old_dir);
874 mark_inode_dirty(new_dir);
875
876 if (has_diriter) {
877 diriter.fi.icb.extLocation =
878 cpu_to_lelb(UDF_I(new_dir)->i_location);
879 udf_fiiter_write_fi(&diriter, NULL);
880 udf_fiiter_release(&diriter);
881 }
882
883 if (is_dir) {
884 inode_dec_link_count(old_dir);
885 if (new_inode)
886 inode_dec_link_count(new_inode);
887 else {
888 inc_nlink(new_dir);
889 mark_inode_dirty(new_dir);
890 }
891 }
892 return 0;
893 out_oiter:
894 if (has_diriter)
895 udf_fiiter_release(&diriter);
896 udf_fiiter_release(&oiter);
897
898 return retval;
899 }
900
901 static struct dentry *udf_get_parent(struct dentry *child)
902 {
903 struct kernel_lb_addr tloc;
904 struct udf_fileident_iter iter;
905 int err;
906
907 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
908 if (err)
909 return ERR_PTR(err);
910
911 tloc = lelb_to_cpu(iter.fi.icb.extLocation);
912 udf_fiiter_release(&iter);
913 return d_obtain_alias(udf_iget(child->d_sb, &tloc));
914 }
915
916
917 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
918 u16 partref, __u32 generation)
919 {
920 struct inode *inode;
921 struct kernel_lb_addr loc;
922
923 if (block == 0)
924 return ERR_PTR(-ESTALE);
925
926 loc.logicalBlockNum = block;
927 loc.partitionReferenceNum = partref;
928 inode = udf_iget(sb, &loc);
929
930 if (IS_ERR(inode))
931 return ERR_CAST(inode);
932
933 if (generation && inode->i_generation != generation) {
934 iput(inode);
935 return ERR_PTR(-ESTALE);
936 }
937 return d_obtain_alias(inode);
938 }
939
940 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
941 struct fid *fid, int fh_len, int fh_type)
942 {
943 if (fh_len < 3 ||
944 (fh_type != FILEID_UDF_WITH_PARENT &&
945 fh_type != FILEID_UDF_WITHOUT_PARENT))
946 return NULL;
947
948 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
949 fid->udf.generation);
950 }
951
952 static struct dentry *udf_fh_to_parent(struct super_block *sb,
953 struct fid *fid, int fh_len, int fh_type)
954 {
955 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
956 return NULL;
957
958 return udf_nfs_get_inode(sb, fid->udf.parent_block,
959 fid->udf.parent_partref,
960 fid->udf.parent_generation);
961 }
962 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
963 struct inode *parent)
964 {
965 int len = *lenp;
966 struct kernel_lb_addr location = UDF_I(inode)->i_location;
967 struct fid *fid = (struct fid *)fh;
968 int type = FILEID_UDF_WITHOUT_PARENT;
969
970 if (parent && (len < 5)) {
971 *lenp = 5;
972 return FILEID_INVALID;
973 } else if (len < 3) {
974 *lenp = 3;
975 return FILEID_INVALID;
976 }
977
978 *lenp = 3;
979 fid->udf.block = location.logicalBlockNum;
980 fid->udf.partref = location.partitionReferenceNum;
981 fid->udf.parent_partref = 0;
982 fid->udf.generation = inode->i_generation;
983
984 if (parent) {
985 location = UDF_I(parent)->i_location;
986 fid->udf.parent_block = location.logicalBlockNum;
987 fid->udf.parent_partref = location.partitionReferenceNum;
988 fid->udf.parent_generation = inode->i_generation;
989 *lenp = 5;
990 type = FILEID_UDF_WITH_PARENT;
991 }
992
993 return type;
994 }
995
996 const struct export_operations udf_export_ops = {
997 .encode_fh = udf_encode_fh,
998 .fh_to_dentry = udf_fh_to_dentry,
999 .fh_to_parent = udf_fh_to_parent,
1000 .get_parent = udf_get_parent,
1001 };
1002
1003 const struct inode_operations udf_dir_inode_operations = {
1004 .lookup = udf_lookup,
1005 .create = udf_create,
1006 .link = udf_link,
1007 .unlink = udf_unlink,
1008 .symlink = udf_symlink,
1009 .mkdir = udf_mkdir,
1010 .rmdir = udf_rmdir,
1011 .mknod = udf_mknod,
1012 .rename = udf_rename,
1013 .tmpfile = udf_tmpfile,
1014 };
1015
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