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
udf_match(int len1,const unsigned char * name1,int len2,const unsigned char * name2)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 */
udf_fiiter_find_entry(struct inode * dir,const struct qstr * child,struct udf_fileident_iter * iter)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_NOFS);
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
udf_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)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
udf_expand_dir_adinicb(struct inode * inode,udf_pblk_t * block)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
udf_fiiter_add_entry(struct inode * dir,struct dentry * dentry,struct udf_fileident_iter * iter)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
udf_fiiter_delete_entry(struct udf_fileident_iter * iter)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
udf_add_fid_counter(struct super_block * sb,bool dir,int val)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
udf_add_nondir(struct dentry * dentry,struct inode * inode)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
udf_create(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)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
udf_tmpfile(struct mnt_idmap * idmap,struct inode * dir,struct file * file,umode_t mode)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
udf_mknod(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)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
udf_mkdir(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)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
empty_dir(struct inode * dir)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
udf_rmdir(struct inode * dir,struct dentry * dentry)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
udf_unlink(struct inode * dir,struct dentry * dentry)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
udf_symlink(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * symname)566 static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
567 struct dentry *dentry, const char *symname)
568 {
569 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
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 if (IS_ERR(inode))
583 return PTR_ERR(inode);
584
585 iinfo = UDF_I(inode);
586 down_write(&iinfo->i_data_sem);
587 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
588 if (!name) {
589 err = -ENOMEM;
590 goto out_no_entry;
591 }
592
593 inode->i_data.a_ops = &udf_symlink_aops;
594 inode->i_op = &udf_symlink_inode_operations;
595 inode_nohighmem(inode);
596
597 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
598 struct kernel_lb_addr eloc;
599 uint32_t bsize;
600
601 block = udf_new_block(sb, inode,
602 iinfo->i_location.partitionReferenceNum,
603 iinfo->i_location.logicalBlockNum, &err);
604 if (!block)
605 goto out_no_entry;
606 epos.block = iinfo->i_location;
607 epos.offset = udf_file_entry_alloc_offset(inode);
608 epos.bh = NULL;
609 eloc.logicalBlockNum = block;
610 eloc.partitionReferenceNum =
611 iinfo->i_location.partitionReferenceNum;
612 bsize = sb->s_blocksize;
613 iinfo->i_lenExtents = bsize;
614 err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
615 brelse(epos.bh);
616 if (err < 0) {
617 udf_free_blocks(sb, inode, &eloc, 0, 1);
618 goto out_no_entry;
619 }
620
621 block = udf_get_pblock(sb, block,
622 iinfo->i_location.partitionReferenceNum,
623 0);
624 epos.bh = sb_getblk(sb, block);
625 if (unlikely(!epos.bh)) {
626 err = -ENOMEM;
627 udf_free_blocks(sb, inode, &eloc, 0, 1);
628 goto out_no_entry;
629 }
630 lock_buffer(epos.bh);
631 memset(epos.bh->b_data, 0x00, bsize);
632 set_buffer_uptodate(epos.bh);
633 unlock_buffer(epos.bh);
634 mark_buffer_dirty_inode(epos.bh, inode);
635 ea = epos.bh->b_data + udf_ext0_offset(inode);
636 } else
637 ea = iinfo->i_data + iinfo->i_lenEAttr;
638
639 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
640 pc = (struct pathComponent *)ea;
641
642 if (*symname == '/') {
643 do {
644 symname++;
645 } while (*symname == '/');
646
647 pc->componentType = 1;
648 pc->lengthComponentIdent = 0;
649 pc->componentFileVersionNum = 0;
650 elen += sizeof(struct pathComponent);
651 }
652
653 err = -ENAMETOOLONG;
654
655 while (*symname) {
656 if (elen + sizeof(struct pathComponent) > eoffset)
657 goto out_no_entry;
658
659 pc = (struct pathComponent *)(ea + elen);
660
661 compstart = symname;
662
663 do {
664 symname++;
665 } while (*symname && *symname != '/');
666
667 pc->componentType = 5;
668 pc->lengthComponentIdent = 0;
669 pc->componentFileVersionNum = 0;
670 if (compstart[0] == '.') {
671 if ((symname - compstart) == 1)
672 pc->componentType = 4;
673 else if ((symname - compstart) == 2 &&
674 compstart[1] == '.')
675 pc->componentType = 3;
676 }
677
678 if (pc->componentType == 5) {
679 namelen = udf_put_filename(sb, compstart,
680 symname - compstart,
681 name, UDF_NAME_LEN_CS0);
682 if (!namelen)
683 goto out_no_entry;
684
685 if (elen + sizeof(struct pathComponent) + namelen >
686 eoffset)
687 goto out_no_entry;
688 else
689 pc->lengthComponentIdent = namelen;
690
691 memcpy(pc->componentIdent, name, namelen);
692 }
693
694 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
695
696 if (*symname) {
697 do {
698 symname++;
699 } while (*symname == '/');
700 }
701 }
702
703 brelse(epos.bh);
704 inode->i_size = elen;
705 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
706 iinfo->i_lenAlloc = inode->i_size;
707 else
708 udf_truncate_tail_extent(inode);
709 mark_inode_dirty(inode);
710 up_write(&iinfo->i_data_sem);
711
712 err = udf_add_nondir(dentry, inode);
713 out:
714 kfree(name);
715 return err;
716
717 out_no_entry:
718 up_write(&iinfo->i_data_sem);
719 inode_dec_link_count(inode);
720 discard_new_inode(inode);
721 goto out;
722 }
723
udf_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)724 static int udf_link(struct dentry *old_dentry, struct inode *dir,
725 struct dentry *dentry)
726 {
727 struct inode *inode = d_inode(old_dentry);
728 struct udf_fileident_iter iter;
729 int err;
730
731 err = udf_fiiter_add_entry(dir, dentry, &iter);
732 if (err)
733 return err;
734 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
735 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
736 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
737 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
738 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
739 }
740 udf_fiiter_write_fi(&iter, NULL);
741 udf_fiiter_release(&iter);
742
743 inc_nlink(inode);
744 udf_add_fid_counter(dir->i_sb, false, 1);
745 inode_set_ctime_current(inode);
746 mark_inode_dirty(inode);
747 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
748 mark_inode_dirty(dir);
749 ihold(inode);
750 d_instantiate(dentry, inode);
751
752 return 0;
753 }
754
755 /* Anybody can rename anything with this: the permission checks are left to the
756 * higher-level routines.
757 */
udf_rename(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)758 static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
759 struct dentry *old_dentry, struct inode *new_dir,
760 struct dentry *new_dentry, unsigned int flags)
761 {
762 struct inode *old_inode = d_inode(old_dentry);
763 struct inode *new_inode = d_inode(new_dentry);
764 struct udf_fileident_iter oiter, niter, diriter;
765 bool has_diriter = false, is_dir = false;
766 int retval;
767 struct kernel_lb_addr tloc;
768
769 if (flags & ~RENAME_NOREPLACE)
770 return -EINVAL;
771
772 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
773 if (retval)
774 return retval;
775
776 tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
777 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
778 retval = -ENOENT;
779 goto out_oiter;
780 }
781
782 if (S_ISDIR(old_inode->i_mode)) {
783 if (new_inode) {
784 retval = -ENOTEMPTY;
785 if (!empty_dir(new_inode))
786 goto out_oiter;
787 }
788 is_dir = true;
789 }
790 if (is_dir && old_dir != new_dir) {
791 retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
792 &diriter);
793 if (retval == -ENOENT) {
794 udf_err(old_inode->i_sb,
795 "directory (ino %lu) has no '..' entry\n",
796 old_inode->i_ino);
797 retval = -EFSCORRUPTED;
798 }
799 if (retval)
800 goto out_oiter;
801 has_diriter = true;
802 tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
803 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
804 old_dir->i_ino) {
805 retval = -EFSCORRUPTED;
806 udf_err(old_inode->i_sb,
807 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
808 old_inode->i_ino, old_dir->i_ino,
809 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
810 goto out_oiter;
811 }
812 }
813
814 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
815 if (retval && retval != -ENOENT)
816 goto out_oiter;
817 /* Entry found but not passed by VFS? */
818 if (!retval && !new_inode) {
819 retval = -EFSCORRUPTED;
820 udf_fiiter_release(&niter);
821 goto out_oiter;
822 }
823 /* Entry not found? Need to add one... */
824 if (retval) {
825 udf_fiiter_release(&niter);
826 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
827 if (retval)
828 goto out_oiter;
829 }
830
831 /*
832 * Like most other Unix systems, set the ctime for inodes on a
833 * rename.
834 */
835 inode_set_ctime_current(old_inode);
836 mark_inode_dirty(old_inode);
837
838 /*
839 * ok, that's it
840 */
841 niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
842 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
843 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
844 udf_fiiter_write_fi(&niter, NULL);
845 udf_fiiter_release(&niter);
846
847 /*
848 * The old entry may have moved due to new entry allocation. Find it
849 * again.
850 */
851 udf_fiiter_release(&oiter);
852 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
853 if (retval) {
854 udf_err(old_dir->i_sb,
855 "failed to find renamed entry again in directory (ino %lu)\n",
856 old_dir->i_ino);
857 } else {
858 udf_fiiter_delete_entry(&oiter);
859 udf_fiiter_release(&oiter);
860 }
861
862 if (new_inode) {
863 inode_set_ctime_current(new_inode);
864 inode_dec_link_count(new_inode);
865 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
866 -1);
867 }
868 inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
869 inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
870 mark_inode_dirty(old_dir);
871 mark_inode_dirty(new_dir);
872
873 if (has_diriter) {
874 diriter.fi.icb.extLocation =
875 cpu_to_lelb(UDF_I(new_dir)->i_location);
876 udf_update_tag((char *)&diriter.fi,
877 udf_dir_entry_len(&diriter.fi));
878 udf_fiiter_write_fi(&diriter, NULL);
879 udf_fiiter_release(&diriter);
880 }
881
882 if (is_dir) {
883 inode_dec_link_count(old_dir);
884 if (new_inode)
885 inode_dec_link_count(new_inode);
886 else {
887 inc_nlink(new_dir);
888 mark_inode_dirty(new_dir);
889 }
890 }
891 return 0;
892 out_oiter:
893 if (has_diriter)
894 udf_fiiter_release(&diriter);
895 udf_fiiter_release(&oiter);
896
897 return retval;
898 }
899
udf_get_parent(struct dentry * child)900 static struct dentry *udf_get_parent(struct dentry *child)
901 {
902 struct kernel_lb_addr tloc;
903 struct udf_fileident_iter iter;
904 int err;
905
906 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
907 if (err)
908 return ERR_PTR(err);
909
910 tloc = lelb_to_cpu(iter.fi.icb.extLocation);
911 udf_fiiter_release(&iter);
912 return d_obtain_alias(udf_iget(child->d_sb, &tloc));
913 }
914
915
udf_nfs_get_inode(struct super_block * sb,u32 block,u16 partref,__u32 generation)916 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
917 u16 partref, __u32 generation)
918 {
919 struct inode *inode;
920 struct kernel_lb_addr loc;
921
922 if (block == 0)
923 return ERR_PTR(-ESTALE);
924
925 loc.logicalBlockNum = block;
926 loc.partitionReferenceNum = partref;
927 inode = udf_iget(sb, &loc);
928
929 if (IS_ERR(inode))
930 return ERR_CAST(inode);
931
932 if (generation && inode->i_generation != generation) {
933 iput(inode);
934 return ERR_PTR(-ESTALE);
935 }
936 return d_obtain_alias(inode);
937 }
938
udf_fh_to_dentry(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)939 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
940 struct fid *fid, int fh_len, int fh_type)
941 {
942 if (fh_len < 3 ||
943 (fh_type != FILEID_UDF_WITH_PARENT &&
944 fh_type != FILEID_UDF_WITHOUT_PARENT))
945 return NULL;
946
947 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
948 fid->udf.generation);
949 }
950
udf_fh_to_parent(struct super_block * sb,struct fid * fid,int fh_len,int fh_type)951 static struct dentry *udf_fh_to_parent(struct super_block *sb,
952 struct fid *fid, int fh_len, int fh_type)
953 {
954 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
955 return NULL;
956
957 return udf_nfs_get_inode(sb, fid->udf.parent_block,
958 fid->udf.parent_partref,
959 fid->udf.parent_generation);
960 }
udf_encode_fh(struct inode * inode,__u32 * fh,int * lenp,struct inode * parent)961 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
962 struct inode *parent)
963 {
964 int len = *lenp;
965 struct kernel_lb_addr location = UDF_I(inode)->i_location;
966 struct fid *fid = (struct fid *)fh;
967 int type = FILEID_UDF_WITHOUT_PARENT;
968
969 if (parent && (len < 5)) {
970 *lenp = 5;
971 return FILEID_INVALID;
972 } else if (len < 3) {
973 *lenp = 3;
974 return FILEID_INVALID;
975 }
976
977 *lenp = 3;
978 fid->udf.block = location.logicalBlockNum;
979 fid->udf.partref = location.partitionReferenceNum;
980 fid->udf.parent_partref = 0;
981 fid->udf.generation = inode->i_generation;
982
983 if (parent) {
984 location = UDF_I(parent)->i_location;
985 fid->udf.parent_block = location.logicalBlockNum;
986 fid->udf.parent_partref = location.partitionReferenceNum;
987 fid->udf.parent_generation = inode->i_generation;
988 *lenp = 5;
989 type = FILEID_UDF_WITH_PARENT;
990 }
991
992 return type;
993 }
994
995 const struct export_operations udf_export_ops = {
996 .encode_fh = udf_encode_fh,
997 .fh_to_dentry = udf_fh_to_dentry,
998 .fh_to_parent = udf_fh_to_parent,
999 .get_parent = udf_get_parent,
1000 };
1001
1002 const struct inode_operations udf_dir_inode_operations = {
1003 .lookup = udf_lookup,
1004 .create = udf_create,
1005 .link = udf_link,
1006 .unlink = udf_unlink,
1007 .symlink = udf_symlink,
1008 .mkdir = udf_mkdir,
1009 .rmdir = udf_rmdir,
1010 .mknod = udf_mknod,
1011 .rename = udf_rename,
1012 .tmpfile = udf_tmpfile,
1013 };
1014