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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
31static 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 */
52static 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
99out_err:
100 udf_fiiter_release(iter);
101out_ok:
102 kfree(fname);
103
104 return ret;
105}
106
107static 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
133static 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
220static 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);
294store_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
321static 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
331static 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
346static 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
373static 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
389static 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
406static 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
422static 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
477static 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
496static 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 if (dir->i_nlink >= 3)
521 inode_dec_link_count(dir);
522 else
523 udf_warn(inode->i_sb, "parent dir link count too low (%u)\n",
524 dir->i_nlink);
525 udf_add_fid_counter(dir->i_sb, true, -1);
526 inode_set_mtime_to_ts(dir,
527 inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode)));
528 mark_inode_dirty(dir);
529 ret = 0;
530end_rmdir:
531 udf_fiiter_release(&iter);
532out:
533 return ret;
534}
535
536static int udf_unlink(struct inode *dir, struct dentry *dentry)
537{
538 int ret;
539 struct inode *inode = d_inode(dentry);
540 struct udf_fileident_iter iter;
541 struct kernel_lb_addr tloc;
542
543 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
544 if (ret)
545 goto out;
546
547 ret = -EFSCORRUPTED;
548 tloc = lelb_to_cpu(iter.fi.icb.extLocation);
549 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
550 goto end_unlink;
551
552 if (!inode->i_nlink) {
553 udf_debug("Deleting nonexistent file (%lu), %u\n",
554 inode->i_ino, inode->i_nlink);
555 set_nlink(inode, 1);
556 }
557 udf_fiiter_delete_entry(&iter);
558 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
559 mark_inode_dirty(dir);
560 inode_dec_link_count(inode);
561 udf_add_fid_counter(dir->i_sb, false, -1);
562 inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
563 ret = 0;
564end_unlink:
565 udf_fiiter_release(&iter);
566out:
567 return ret;
568}
569
570static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
571 struct dentry *dentry, const char *symname)
572{
573 struct inode *inode;
574 struct pathComponent *pc;
575 const char *compstart;
576 struct extent_position epos = {};
577 int eoffset, elen = 0;
578 uint8_t *ea;
579 int err;
580 udf_pblk_t block;
581 unsigned char *name = NULL;
582 int namelen;
583 struct udf_inode_info *iinfo;
584 struct super_block *sb = dir->i_sb;
585
586 name = kmalloc(UDF_NAME_LEN_CS0, GFP_KERNEL);
587 if (!name) {
588 err = -ENOMEM;
589 goto out;
590 }
591
592 inode = udf_new_inode(dir, S_IFLNK | 0777);
593 if (IS_ERR(inode)) {
594 err = PTR_ERR(inode);
595 goto out;
596 }
597
598 iinfo = UDF_I(inode);
599 down_write(&iinfo->i_data_sem);
600 inode->i_data.a_ops = &udf_symlink_aops;
601 inode->i_op = &udf_symlink_inode_operations;
602 inode_nohighmem(inode);
603
604 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
605 struct kernel_lb_addr eloc;
606 uint32_t bsize;
607
608 block = udf_new_block(sb, inode,
609 iinfo->i_location.partitionReferenceNum,
610 iinfo->i_location.logicalBlockNum, &err);
611 if (!block)
612 goto out_no_entry;
613 epos.block = iinfo->i_location;
614 epos.offset = udf_file_entry_alloc_offset(inode);
615 epos.bh = NULL;
616 eloc.logicalBlockNum = block;
617 eloc.partitionReferenceNum =
618 iinfo->i_location.partitionReferenceNum;
619 bsize = sb->s_blocksize;
620 iinfo->i_lenExtents = bsize;
621 err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
622 brelse(epos.bh);
623 if (err < 0) {
624 udf_free_blocks(sb, inode, &eloc, 0, 1);
625 goto out_no_entry;
626 }
627
628 block = udf_get_pblock(sb, block,
629 iinfo->i_location.partitionReferenceNum,
630 0);
631 epos.bh = sb_getblk(sb, block);
632 if (unlikely(!epos.bh)) {
633 err = -ENOMEM;
634 udf_free_blocks(sb, inode, &eloc, 0, 1);
635 goto out_no_entry;
636 }
637 lock_buffer(epos.bh);
638 memset(epos.bh->b_data, 0x00, bsize);
639 set_buffer_uptodate(epos.bh);
640 unlock_buffer(epos.bh);
641 mark_buffer_dirty_inode(epos.bh, inode);
642 ea = epos.bh->b_data + udf_ext0_offset(inode);
643 } else
644 ea = iinfo->i_data + iinfo->i_lenEAttr;
645
646 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
647 pc = (struct pathComponent *)ea;
648
649 if (*symname == '/') {
650 do {
651 symname++;
652 } while (*symname == '/');
653
654 pc->componentType = 1;
655 pc->lengthComponentIdent = 0;
656 pc->componentFileVersionNum = 0;
657 elen += sizeof(struct pathComponent);
658 }
659
660 err = -ENAMETOOLONG;
661
662 while (*symname) {
663 if (elen + sizeof(struct pathComponent) > eoffset)
664 goto out_no_entry;
665
666 pc = (struct pathComponent *)(ea + elen);
667
668 compstart = symname;
669
670 do {
671 symname++;
672 } while (*symname && *symname != '/');
673
674 pc->componentType = 5;
675 pc->lengthComponentIdent = 0;
676 pc->componentFileVersionNum = 0;
677 if (compstart[0] == '.') {
678 if ((symname - compstart) == 1)
679 pc->componentType = 4;
680 else if ((symname - compstart) == 2 &&
681 compstart[1] == '.')
682 pc->componentType = 3;
683 }
684
685 if (pc->componentType == 5) {
686 namelen = udf_put_filename(sb, compstart,
687 symname - compstart,
688 name, UDF_NAME_LEN_CS0);
689 if (!namelen)
690 goto out_no_entry;
691
692 if (elen + sizeof(struct pathComponent) + namelen >
693 eoffset)
694 goto out_no_entry;
695 else
696 pc->lengthComponentIdent = namelen;
697
698 memcpy(pc->componentIdent, name, namelen);
699 }
700
701 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
702
703 if (*symname) {
704 do {
705 symname++;
706 } while (*symname == '/');
707 }
708 }
709
710 brelse(epos.bh);
711 inode->i_size = elen;
712 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
713 iinfo->i_lenAlloc = inode->i_size;
714 else
715 udf_truncate_tail_extent(inode);
716 mark_inode_dirty(inode);
717 up_write(&iinfo->i_data_sem);
718
719 err = udf_add_nondir(dentry, inode);
720out:
721 kfree(name);
722 return err;
723
724out_no_entry:
725 up_write(&iinfo->i_data_sem);
726 inode_dec_link_count(inode);
727 discard_new_inode(inode);
728 goto out;
729}
730
731static int udf_link(struct dentry *old_dentry, struct inode *dir,
732 struct dentry *dentry)
733{
734 struct inode *inode = d_inode(old_dentry);
735 struct udf_fileident_iter iter;
736 int err;
737
738 err = udf_fiiter_add_entry(dir, dentry, &iter);
739 if (err)
740 return err;
741 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
742 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
743 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
744 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
745 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
746 }
747 udf_fiiter_write_fi(&iter, NULL);
748 udf_fiiter_release(&iter);
749
750 inc_nlink(inode);
751 udf_add_fid_counter(dir->i_sb, false, 1);
752 inode_set_ctime_current(inode);
753 mark_inode_dirty(inode);
754 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
755 mark_inode_dirty(dir);
756 ihold(inode);
757 d_instantiate(dentry, inode);
758
759 return 0;
760}
761
762/* Anybody can rename anything with this: the permission checks are left to the
763 * higher-level routines.
764 */
765static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
766 struct dentry *old_dentry, struct inode *new_dir,
767 struct dentry *new_dentry, unsigned int flags)
768{
769 struct inode *old_inode = d_inode(old_dentry);
770 struct inode *new_inode = d_inode(new_dentry);
771 struct udf_fileident_iter oiter, niter, diriter;
772 bool has_diriter = false, is_dir = false;
773 int retval;
774 struct kernel_lb_addr tloc;
775
776 if (flags & ~RENAME_NOREPLACE)
777 return -EINVAL;
778
779 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
780 if (retval)
781 return retval;
782
783 tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
784 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
785 retval = -ENOENT;
786 goto out_oiter;
787 }
788
789 if (S_ISDIR(old_inode->i_mode)) {
790 if (new_inode) {
791 retval = -ENOTEMPTY;
792 if (!empty_dir(new_inode))
793 goto out_oiter;
794 retval = -EFSCORRUPTED;
795 if (new_inode->i_nlink != 2)
796 goto out_oiter;
797 }
798 retval = -EFSCORRUPTED;
799 if (old_dir->i_nlink < 3)
800 goto out_oiter;
801 is_dir = true;
802 } else if (new_inode) {
803 retval = -EFSCORRUPTED;
804 if (new_inode->i_nlink < 1)
805 goto out_oiter;
806 }
807 if (is_dir && old_dir != new_dir) {
808 retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
809 &diriter);
810 if (retval == -ENOENT) {
811 udf_err(old_inode->i_sb,
812 "directory (ino %lu) has no '..' entry\n",
813 old_inode->i_ino);
814 retval = -EFSCORRUPTED;
815 }
816 if (retval)
817 goto out_oiter;
818 has_diriter = true;
819 tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
820 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
821 old_dir->i_ino) {
822 retval = -EFSCORRUPTED;
823 udf_err(old_inode->i_sb,
824 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
825 old_inode->i_ino, old_dir->i_ino,
826 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
827 goto out_oiter;
828 }
829 }
830
831 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
832 if (retval && retval != -ENOENT)
833 goto out_oiter;
834 /* Entry found but not passed by VFS? */
835 if (!retval && !new_inode) {
836 retval = -EFSCORRUPTED;
837 udf_fiiter_release(&niter);
838 goto out_oiter;
839 }
840 /* Entry not found? Need to add one... */
841 if (retval) {
842 udf_fiiter_release(&niter);
843 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
844 if (retval)
845 goto out_oiter;
846 }
847
848 /*
849 * Like most other Unix systems, set the ctime for inodes on a
850 * rename.
851 */
852 inode_set_ctime_current(old_inode);
853 mark_inode_dirty(old_inode);
854
855 /*
856 * ok, that's it
857 */
858 niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
859 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
860 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
861 udf_fiiter_write_fi(&niter, NULL);
862 udf_fiiter_release(&niter);
863
864 /*
865 * The old entry may have moved due to new entry allocation. Find it
866 * again.
867 */
868 udf_fiiter_release(&oiter);
869 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
870 if (retval) {
871 udf_err(old_dir->i_sb,
872 "failed to find renamed entry again in directory (ino %lu)\n",
873 old_dir->i_ino);
874 } else {
875 udf_fiiter_delete_entry(&oiter);
876 udf_fiiter_release(&oiter);
877 }
878
879 if (new_inode) {
880 inode_set_ctime_current(new_inode);
881 inode_dec_link_count(new_inode);
882 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
883 -1);
884 }
885 inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
886 inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
887 mark_inode_dirty(old_dir);
888 mark_inode_dirty(new_dir);
889
890 if (has_diriter) {
891 diriter.fi.icb.extLocation =
892 cpu_to_lelb(UDF_I(new_dir)->i_location);
893 udf_fiiter_write_fi(&diriter, NULL);
894 udf_fiiter_release(&diriter);
895 }
896
897 if (is_dir) {
898 inode_dec_link_count(old_dir);
899 if (new_inode)
900 inode_dec_link_count(new_inode);
901 else {
902 inc_nlink(new_dir);
903 mark_inode_dirty(new_dir);
904 }
905 }
906 return 0;
907out_oiter:
908 if (has_diriter)
909 udf_fiiter_release(&diriter);
910 udf_fiiter_release(&oiter);
911
912 return retval;
913}
914
915static struct dentry *udf_get_parent(struct dentry *child)
916{
917 struct kernel_lb_addr tloc;
918 struct udf_fileident_iter iter;
919 int err;
920
921 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
922 if (err)
923 return ERR_PTR(err);
924
925 tloc = lelb_to_cpu(iter.fi.icb.extLocation);
926 udf_fiiter_release(&iter);
927 return d_obtain_alias(udf_iget(child->d_sb, &tloc));
928}
929
930
931static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
932 u16 partref, __u32 generation)
933{
934 struct inode *inode;
935 struct kernel_lb_addr loc;
936
937 if (block == 0)
938 return ERR_PTR(-ESTALE);
939
940 loc.logicalBlockNum = block;
941 loc.partitionReferenceNum = partref;
942 inode = udf_iget(sb, &loc);
943
944 if (IS_ERR(inode))
945 return ERR_CAST(inode);
946
947 if (generation && inode->i_generation != generation) {
948 iput(inode);
949 return ERR_PTR(-ESTALE);
950 }
951 return d_obtain_alias(inode);
952}
953
954static struct dentry *udf_fh_to_dentry(struct super_block *sb,
955 struct fid *fid, int fh_len, int fh_type)
956{
957 if (fh_len < 3 ||
958 (fh_type != FILEID_UDF_WITH_PARENT &&
959 fh_type != FILEID_UDF_WITHOUT_PARENT))
960 return NULL;
961
962 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
963 fid->udf.generation);
964}
965
966static struct dentry *udf_fh_to_parent(struct super_block *sb,
967 struct fid *fid, int fh_len, int fh_type)
968{
969 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
970 return NULL;
971
972 return udf_nfs_get_inode(sb, fid->udf.parent_block,
973 fid->udf.parent_partref,
974 fid->udf.parent_generation);
975}
976static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
977 struct inode *parent)
978{
979 int len = *lenp;
980 struct kernel_lb_addr location = UDF_I(inode)->i_location;
981 struct fid *fid = (struct fid *)fh;
982 int type = FILEID_UDF_WITHOUT_PARENT;
983
984 if (parent && (len < 5)) {
985 *lenp = 5;
986 return FILEID_INVALID;
987 } else if (len < 3) {
988 *lenp = 3;
989 return FILEID_INVALID;
990 }
991
992 *lenp = 3;
993 fid->udf.block = location.logicalBlockNum;
994 fid->udf.partref = location.partitionReferenceNum;
995 fid->udf.parent_partref = 0;
996 fid->udf.generation = inode->i_generation;
997
998 if (parent) {
999 location = UDF_I(parent)->i_location;
1000 fid->udf.parent_block = location.logicalBlockNum;
1001 fid->udf.parent_partref = location.partitionReferenceNum;
1002 fid->udf.parent_generation = inode->i_generation;
1003 *lenp = 5;
1004 type = FILEID_UDF_WITH_PARENT;
1005 }
1006
1007 return type;
1008}
1009
1010const struct export_operations udf_export_ops = {
1011 .encode_fh = udf_encode_fh,
1012 .fh_to_dentry = udf_fh_to_dentry,
1013 .fh_to_parent = udf_fh_to_parent,
1014 .get_parent = udf_get_parent,
1015};
1016
1017const struct inode_operations udf_dir_inode_operations = {
1018 .lookup = udf_lookup,
1019 .create = udf_create,
1020 .link = udf_link,
1021 .unlink = udf_unlink,
1022 .symlink = udf_symlink,
1023 .mkdir = udf_mkdir,
1024 .rmdir = udf_rmdir,
1025 .mknod = udf_mknod,
1026 .rename = udf_rename,
1027 .tmpfile = udf_tmpfile,
1028};
1/*
2 * namei.c
3 *
4 * PURPOSE
5 * Inode name handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * COPYRIGHT
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
12 *
13 * (C) 1998-2004 Ben Fennema
14 * (C) 1999-2000 Stelias Computing Inc
15 *
16 * HISTORY
17 *
18 * 12/12/98 blf Created. Split out the lookup code from dir.c
19 * 04/19/99 blf link, mknod, symlink support
20 */
21
22#include "udfdecl.h"
23
24#include "udf_i.h"
25#include "udf_sb.h"
26#include <linux/string.h>
27#include <linux/errno.h>
28#include <linux/mm.h>
29#include <linux/slab.h>
30#include <linux/sched.h>
31#include <linux/crc-itu-t.h>
32#include <linux/exportfs.h>
33#include <linux/iversion.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(sfi->impUse + liu, fileident, lfi);
79 } else if (offset >= 0) {
80 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
81 } else {
82 memcpy(sfi->impUse + liu, fileident, -offset);
83 memcpy(fibh->ebh->b_data, fileident - offset,
84 lfi + offset);
85 }
86 }
87
88 offset += lfi;
89
90 if (adinicb || (offset + padlen < 0)) {
91 memset(sfi->impUse + liu + lfi, 0x00, padlen);
92 } else if (offset >= 0) {
93 memset(fibh->ebh->b_data + offset, 0x00, padlen);
94 } else {
95 memset(sfi->impUse + liu + lfi, 0x00, -offset);
96 memset(fibh->ebh->b_data, 0x00, padlen + offset);
97 }
98
99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
100 sizeof(struct fileIdentDesc) - sizeof(struct tag));
101
102 if (fibh->sbh == fibh->ebh) {
103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
104 crclen + sizeof(struct tag) -
105 sizeof(struct fileIdentDesc));
106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
107 crc = crc_itu_t(crc, fibh->ebh->b_data +
108 sizeof(struct fileIdentDesc) +
109 fibh->soffset,
110 crclen + sizeof(struct tag) -
111 sizeof(struct fileIdentDesc));
112 } else {
113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
114 -fibh->soffset - sizeof(struct fileIdentDesc));
115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
116 }
117
118 cfi->descTag.descCRC = cpu_to_le16(crc);
119 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
121
122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
123 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
124 sizeof(struct fileIdentDesc));
125 } else {
126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
128 sizeof(struct fileIdentDesc) + fibh->soffset);
129 }
130
131 if (adinicb) {
132 mark_inode_dirty(inode);
133 } else {
134 if (fibh->sbh != fibh->ebh)
135 mark_buffer_dirty_inode(fibh->ebh, inode);
136 mark_buffer_dirty_inode(fibh->sbh, inode);
137 }
138 inode_inc_iversion(inode);
139
140 return 0;
141}
142
143/**
144 * udf_find_entry - find entry in given directory.
145 *
146 * @dir: directory inode to search in
147 * @child: qstr of the name
148 * @fibh: buffer head / inode with file identifier descriptor we found
149 * @cfi: found file identifier descriptor with given name
150 *
151 * This function searches in the directory @dir for a file name @child. When
152 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
153 * directories) containing the file identifier descriptor (FID). In that case
154 * the function returns pointer to the FID in the buffer or inode - but note
155 * that FID may be split among two buffers (blocks) so accessing it via that
156 * pointer isn't easily possible. This pointer can be used only as an iterator
157 * for other directory manipulation functions. For inspection of the FID @cfi
158 * can be used - the found FID is copied there.
159 *
160 * Returns pointer to FID, NULL when nothing found, or error code.
161 */
162static struct fileIdentDesc *udf_find_entry(struct inode *dir,
163 const struct qstr *child,
164 struct udf_fileident_bh *fibh,
165 struct fileIdentDesc *cfi)
166{
167 struct fileIdentDesc *fi = NULL;
168 loff_t f_pos;
169 udf_pblk_t block;
170 int flen;
171 unsigned char *fname = NULL, *copy_name = NULL;
172 unsigned char *nameptr;
173 uint8_t lfi;
174 uint16_t liu;
175 loff_t size;
176 struct kernel_lb_addr eloc;
177 uint32_t elen;
178 sector_t offset;
179 struct extent_position epos = {};
180 struct udf_inode_info *dinfo = UDF_I(dir);
181 int isdotdot = child->len == 2 &&
182 child->name[0] == '.' && child->name[1] == '.';
183 struct super_block *sb = dir->i_sb;
184
185 size = udf_ext0_offset(dir) + dir->i_size;
186 f_pos = udf_ext0_offset(dir);
187
188 fibh->sbh = fibh->ebh = NULL;
189 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
190 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
191 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
192 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
193 fi = ERR_PTR(-EIO);
194 goto out_err;
195 }
196
197 block = udf_get_lb_pblock(sb, &eloc, offset);
198 if ((++offset << sb->s_blocksize_bits) < elen) {
199 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
200 epos.offset -= sizeof(struct short_ad);
201 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
202 epos.offset -= sizeof(struct long_ad);
203 } else
204 offset = 0;
205
206 fibh->sbh = fibh->ebh = udf_tread(sb, block);
207 if (!fibh->sbh) {
208 fi = ERR_PTR(-EIO);
209 goto out_err;
210 }
211 }
212
213 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
214 if (!fname) {
215 fi = ERR_PTR(-ENOMEM);
216 goto out_err;
217 }
218
219 while (f_pos < size) {
220 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
221 &elen, &offset);
222 if (!fi) {
223 fi = ERR_PTR(-EIO);
224 goto out_err;
225 }
226
227 liu = le16_to_cpu(cfi->lengthOfImpUse);
228 lfi = cfi->lengthFileIdent;
229
230 if (fibh->sbh == fibh->ebh) {
231 nameptr = udf_get_fi_ident(fi);
232 } else {
233 int poffset; /* Unpaded ending offset */
234
235 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
236 liu + lfi;
237
238 if (poffset >= lfi)
239 nameptr = (uint8_t *)(fibh->ebh->b_data +
240 poffset - lfi);
241 else {
242 if (!copy_name) {
243 copy_name = kmalloc(UDF_NAME_LEN_CS0,
244 GFP_NOFS);
245 if (!copy_name) {
246 fi = ERR_PTR(-ENOMEM);
247 goto out_err;
248 }
249 }
250 nameptr = copy_name;
251 memcpy(nameptr, udf_get_fi_ident(fi),
252 lfi - poffset);
253 memcpy(nameptr + lfi - poffset,
254 fibh->ebh->b_data, poffset);
255 }
256 }
257
258 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
259 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
260 continue;
261 }
262
263 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
264 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
265 continue;
266 }
267
268 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
269 isdotdot)
270 goto out_ok;
271
272 if (!lfi)
273 continue;
274
275 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
276 if (flen < 0) {
277 fi = ERR_PTR(flen);
278 goto out_err;
279 }
280
281 if (udf_match(flen, fname, child->len, child->name))
282 goto out_ok;
283 }
284
285 fi = NULL;
286out_err:
287 if (fibh->sbh != fibh->ebh)
288 brelse(fibh->ebh);
289 brelse(fibh->sbh);
290out_ok:
291 brelse(epos.bh);
292 kfree(fname);
293 kfree(copy_name);
294
295 return fi;
296}
297
298static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
299 unsigned int flags)
300{
301 struct inode *inode = NULL;
302 struct fileIdentDesc cfi;
303 struct udf_fileident_bh fibh;
304 struct fileIdentDesc *fi;
305
306 if (dentry->d_name.len > UDF_NAME_LEN)
307 return ERR_PTR(-ENAMETOOLONG);
308
309 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
310 if (IS_ERR(fi))
311 return ERR_CAST(fi);
312
313 if (fi) {
314 struct kernel_lb_addr loc;
315
316 if (fibh.sbh != fibh.ebh)
317 brelse(fibh.ebh);
318 brelse(fibh.sbh);
319
320 loc = lelb_to_cpu(cfi.icb.extLocation);
321 inode = udf_iget(dir->i_sb, &loc);
322 if (IS_ERR(inode))
323 return ERR_CAST(inode);
324 }
325
326 return d_splice_alias(inode, dentry);
327}
328
329static struct fileIdentDesc *udf_add_entry(struct inode *dir,
330 struct dentry *dentry,
331 struct udf_fileident_bh *fibh,
332 struct fileIdentDesc *cfi, int *err)
333{
334 struct super_block *sb = dir->i_sb;
335 struct fileIdentDesc *fi = NULL;
336 unsigned char *name = NULL;
337 int namelen;
338 loff_t f_pos;
339 loff_t size = udf_ext0_offset(dir) + dir->i_size;
340 int nfidlen;
341 udf_pblk_t block;
342 struct kernel_lb_addr eloc;
343 uint32_t elen = 0;
344 sector_t offset;
345 struct extent_position epos = {};
346 struct udf_inode_info *dinfo;
347
348 fibh->sbh = fibh->ebh = NULL;
349 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
350 if (!name) {
351 *err = -ENOMEM;
352 goto out_err;
353 }
354
355 if (dentry) {
356 if (!dentry->d_name.len) {
357 *err = -EINVAL;
358 goto out_err;
359 }
360 namelen = udf_put_filename(sb, dentry->d_name.name,
361 dentry->d_name.len,
362 name, UDF_NAME_LEN_CS0);
363 if (!namelen) {
364 *err = -ENAMETOOLONG;
365 goto out_err;
366 }
367 } else {
368 namelen = 0;
369 }
370
371 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
372
373 f_pos = udf_ext0_offset(dir);
374
375 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
376 dinfo = UDF_I(dir);
377 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
378 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
379 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
380 block = udf_get_lb_pblock(dir->i_sb,
381 &dinfo->i_location, 0);
382 fibh->soffset = fibh->eoffset = sb->s_blocksize;
383 goto add;
384 }
385 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
386 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
387 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
388 epos.offset -= sizeof(struct short_ad);
389 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
390 epos.offset -= sizeof(struct long_ad);
391 } else
392 offset = 0;
393
394 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
395 if (!fibh->sbh) {
396 *err = -EIO;
397 goto out_err;
398 }
399
400 block = dinfo->i_location.logicalBlockNum;
401 }
402
403 while (f_pos < size) {
404 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
405 &elen, &offset);
406
407 if (!fi) {
408 *err = -EIO;
409 goto out_err;
410 }
411
412 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
413 if (udf_dir_entry_len(cfi) == nfidlen) {
414 cfi->descTag.tagSerialNum = cpu_to_le16(1);
415 cfi->fileVersionNum = cpu_to_le16(1);
416 cfi->fileCharacteristics = 0;
417 cfi->lengthFileIdent = namelen;
418 cfi->lengthOfImpUse = cpu_to_le16(0);
419 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
420 name))
421 goto out_ok;
422 else {
423 *err = -EIO;
424 goto out_err;
425 }
426 }
427 }
428 }
429
430add:
431 f_pos += nfidlen;
432
433 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
434 sb->s_blocksize - fibh->eoffset < nfidlen) {
435 brelse(epos.bh);
436 epos.bh = NULL;
437 fibh->soffset -= udf_ext0_offset(dir);
438 fibh->eoffset -= udf_ext0_offset(dir);
439 f_pos -= udf_ext0_offset(dir);
440 if (fibh->sbh != fibh->ebh)
441 brelse(fibh->ebh);
442 brelse(fibh->sbh);
443 fibh->sbh = fibh->ebh =
444 udf_expand_dir_adinicb(dir, &block, err);
445 if (!fibh->sbh)
446 goto out_err;
447 epos.block = dinfo->i_location;
448 epos.offset = udf_file_entry_alloc_offset(dir);
449 /* Load extent udf_expand_dir_adinicb() has created */
450 udf_current_aext(dir, &epos, &eloc, &elen, 1);
451 }
452
453 /* Entry fits into current block? */
454 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
455 fibh->soffset = fibh->eoffset;
456 fibh->eoffset += nfidlen;
457 if (fibh->sbh != fibh->ebh) {
458 brelse(fibh->sbh);
459 fibh->sbh = fibh->ebh;
460 }
461
462 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
463 block = dinfo->i_location.logicalBlockNum;
464 fi = (struct fileIdentDesc *)
465 (dinfo->i_data + fibh->soffset -
466 udf_ext0_offset(dir) +
467 dinfo->i_lenEAttr);
468 } else {
469 block = eloc.logicalBlockNum +
470 ((elen - 1) >>
471 dir->i_sb->s_blocksize_bits);
472 fi = (struct fileIdentDesc *)
473 (fibh->sbh->b_data + fibh->soffset);
474 }
475 } else {
476 /* Round up last extent in the file */
477 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
478 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
479 epos.offset -= sizeof(struct short_ad);
480 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
481 epos.offset -= sizeof(struct long_ad);
482 udf_write_aext(dir, &epos, &eloc, elen, 1);
483 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
484 - 1) & ~(sb->s_blocksize - 1);
485
486 fibh->soffset = fibh->eoffset - sb->s_blocksize;
487 fibh->eoffset += nfidlen - sb->s_blocksize;
488 if (fibh->sbh != fibh->ebh) {
489 brelse(fibh->sbh);
490 fibh->sbh = fibh->ebh;
491 }
492
493 block = eloc.logicalBlockNum + ((elen - 1) >>
494 dir->i_sb->s_blocksize_bits);
495 fibh->ebh = udf_bread(dir,
496 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
497 if (!fibh->ebh)
498 goto out_err;
499 /* Extents could have been merged, invalidate our position */
500 brelse(epos.bh);
501 epos.bh = NULL;
502 epos.block = dinfo->i_location;
503 epos.offset = udf_file_entry_alloc_offset(dir);
504
505 if (!fibh->soffset) {
506 /* Find the freshly allocated block */
507 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
508 (EXT_RECORDED_ALLOCATED >> 30))
509 ;
510 block = eloc.logicalBlockNum + ((elen - 1) >>
511 dir->i_sb->s_blocksize_bits);
512 brelse(fibh->sbh);
513 fibh->sbh = fibh->ebh;
514 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
515 } else {
516 fi = (struct fileIdentDesc *)
517 (fibh->sbh->b_data + sb->s_blocksize +
518 fibh->soffset);
519 }
520 }
521
522 memset(cfi, 0, sizeof(struct fileIdentDesc));
523 if (UDF_SB(sb)->s_udfrev >= 0x0200)
524 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
525 sizeof(struct tag));
526 else
527 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
528 sizeof(struct tag));
529 cfi->fileVersionNum = cpu_to_le16(1);
530 cfi->lengthFileIdent = namelen;
531 cfi->lengthOfImpUse = cpu_to_le16(0);
532 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
533 dir->i_size += nfidlen;
534 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
535 dinfo->i_lenAlloc += nfidlen;
536 else {
537 /* Find the last extent and truncate it to proper size */
538 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
539 (EXT_RECORDED_ALLOCATED >> 30))
540 ;
541 elen -= dinfo->i_lenExtents - dir->i_size;
542 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
543 epos.offset -= sizeof(struct short_ad);
544 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
545 epos.offset -= sizeof(struct long_ad);
546 udf_write_aext(dir, &epos, &eloc, elen, 1);
547 dinfo->i_lenExtents = dir->i_size;
548 }
549
550 mark_inode_dirty(dir);
551 goto out_ok;
552 } else {
553 *err = -EIO;
554 goto out_err;
555 }
556
557out_err:
558 fi = NULL;
559 if (fibh->sbh != fibh->ebh)
560 brelse(fibh->ebh);
561 brelse(fibh->sbh);
562out_ok:
563 brelse(epos.bh);
564 kfree(name);
565 return fi;
566}
567
568static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
569 struct udf_fileident_bh *fibh,
570 struct fileIdentDesc *cfi)
571{
572 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
573
574 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
575 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
576
577 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
578}
579
580static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
581{
582 struct udf_inode_info *iinfo = UDF_I(inode);
583 struct inode *dir = d_inode(dentry->d_parent);
584 struct udf_fileident_bh fibh;
585 struct fileIdentDesc cfi, *fi;
586 int err;
587
588 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
589 if (unlikely(!fi)) {
590 inode_dec_link_count(inode);
591 discard_new_inode(inode);
592 return err;
593 }
594 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
595 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
596 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
597 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
598 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
599 dir->i_ctime = dir->i_mtime = current_time(dir);
600 mark_inode_dirty(dir);
601 if (fibh.sbh != fibh.ebh)
602 brelse(fibh.ebh);
603 brelse(fibh.sbh);
604 d_instantiate_new(dentry, inode);
605
606 return 0;
607}
608
609static int udf_create(struct user_namespace *mnt_userns, struct inode *dir,
610 struct dentry *dentry, umode_t mode, bool excl)
611{
612 struct inode *inode = udf_new_inode(dir, mode);
613
614 if (IS_ERR(inode))
615 return PTR_ERR(inode);
616
617 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
618 inode->i_data.a_ops = &udf_adinicb_aops;
619 else
620 inode->i_data.a_ops = &udf_aops;
621 inode->i_op = &udf_file_inode_operations;
622 inode->i_fop = &udf_file_operations;
623 mark_inode_dirty(inode);
624
625 return udf_add_nondir(dentry, inode);
626}
627
628static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
629 struct file *file, umode_t mode)
630{
631 struct inode *inode = udf_new_inode(dir, mode);
632
633 if (IS_ERR(inode))
634 return PTR_ERR(inode);
635
636 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
637 inode->i_data.a_ops = &udf_adinicb_aops;
638 else
639 inode->i_data.a_ops = &udf_aops;
640 inode->i_op = &udf_file_inode_operations;
641 inode->i_fop = &udf_file_operations;
642 mark_inode_dirty(inode);
643 d_tmpfile(file, inode);
644 unlock_new_inode(inode);
645 return finish_open_simple(file, 0);
646}
647
648static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir,
649 struct dentry *dentry, umode_t mode, dev_t rdev)
650{
651 struct inode *inode;
652
653 if (!old_valid_dev(rdev))
654 return -EINVAL;
655
656 inode = udf_new_inode(dir, mode);
657 if (IS_ERR(inode))
658 return PTR_ERR(inode);
659
660 init_special_inode(inode, mode, rdev);
661 return udf_add_nondir(dentry, inode);
662}
663
664static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
665 struct dentry *dentry, umode_t mode)
666{
667 struct inode *inode;
668 struct udf_fileident_bh fibh;
669 struct fileIdentDesc cfi, *fi;
670 int err;
671 struct udf_inode_info *dinfo = UDF_I(dir);
672 struct udf_inode_info *iinfo;
673
674 inode = udf_new_inode(dir, S_IFDIR | mode);
675 if (IS_ERR(inode))
676 return PTR_ERR(inode);
677
678 iinfo = UDF_I(inode);
679 inode->i_op = &udf_dir_inode_operations;
680 inode->i_fop = &udf_dir_operations;
681 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
682 if (!fi) {
683 inode_dec_link_count(inode);
684 discard_new_inode(inode);
685 goto out;
686 }
687 set_nlink(inode, 2);
688 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
689 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
690 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
691 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
692 cfi.fileCharacteristics =
693 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
694 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
695 brelse(fibh.sbh);
696 mark_inode_dirty(inode);
697
698 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
699 if (!fi) {
700 clear_nlink(inode);
701 mark_inode_dirty(inode);
702 discard_new_inode(inode);
703 goto out;
704 }
705 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
706 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
707 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
708 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
709 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
710 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
711 inc_nlink(dir);
712 dir->i_ctime = dir->i_mtime = current_time(dir);
713 mark_inode_dirty(dir);
714 d_instantiate_new(dentry, inode);
715 if (fibh.sbh != fibh.ebh)
716 brelse(fibh.ebh);
717 brelse(fibh.sbh);
718 err = 0;
719
720out:
721 return err;
722}
723
724static int empty_dir(struct inode *dir)
725{
726 struct fileIdentDesc *fi, cfi;
727 struct udf_fileident_bh fibh;
728 loff_t f_pos;
729 loff_t size = udf_ext0_offset(dir) + dir->i_size;
730 udf_pblk_t block;
731 struct kernel_lb_addr eloc;
732 uint32_t elen;
733 sector_t offset;
734 struct extent_position epos = {};
735 struct udf_inode_info *dinfo = UDF_I(dir);
736
737 f_pos = udf_ext0_offset(dir);
738 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
739
740 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
741 fibh.sbh = fibh.ebh = NULL;
742 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
743 &epos, &eloc, &elen, &offset) ==
744 (EXT_RECORDED_ALLOCATED >> 30)) {
745 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
746 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
747 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
748 epos.offset -= sizeof(struct short_ad);
749 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
750 epos.offset -= sizeof(struct long_ad);
751 } else
752 offset = 0;
753
754 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
755 if (!fibh.sbh) {
756 brelse(epos.bh);
757 return 0;
758 }
759 } else {
760 brelse(epos.bh);
761 return 0;
762 }
763
764 while (f_pos < size) {
765 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
766 &elen, &offset);
767 if (!fi) {
768 if (fibh.sbh != fibh.ebh)
769 brelse(fibh.ebh);
770 brelse(fibh.sbh);
771 brelse(epos.bh);
772 return 0;
773 }
774
775 if (cfi.lengthFileIdent &&
776 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
777 if (fibh.sbh != fibh.ebh)
778 brelse(fibh.ebh);
779 brelse(fibh.sbh);
780 brelse(epos.bh);
781 return 0;
782 }
783 }
784
785 if (fibh.sbh != fibh.ebh)
786 brelse(fibh.ebh);
787 brelse(fibh.sbh);
788 brelse(epos.bh);
789
790 return 1;
791}
792
793static int udf_rmdir(struct inode *dir, struct dentry *dentry)
794{
795 int retval;
796 struct inode *inode = d_inode(dentry);
797 struct udf_fileident_bh fibh;
798 struct fileIdentDesc *fi, cfi;
799 struct kernel_lb_addr tloc;
800
801 retval = -ENOENT;
802 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
803 if (IS_ERR_OR_NULL(fi)) {
804 if (fi)
805 retval = PTR_ERR(fi);
806 goto out;
807 }
808
809 retval = -EIO;
810 tloc = lelb_to_cpu(cfi.icb.extLocation);
811 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
812 goto end_rmdir;
813 retval = -ENOTEMPTY;
814 if (!empty_dir(inode))
815 goto end_rmdir;
816 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
817 if (retval)
818 goto end_rmdir;
819 if (inode->i_nlink != 2)
820 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
821 inode->i_nlink);
822 clear_nlink(inode);
823 inode->i_size = 0;
824 inode_dec_link_count(dir);
825 inode->i_ctime = dir->i_ctime = dir->i_mtime =
826 current_time(inode);
827 mark_inode_dirty(dir);
828
829end_rmdir:
830 if (fibh.sbh != fibh.ebh)
831 brelse(fibh.ebh);
832 brelse(fibh.sbh);
833
834out:
835 return retval;
836}
837
838static int udf_unlink(struct inode *dir, struct dentry *dentry)
839{
840 int retval;
841 struct inode *inode = d_inode(dentry);
842 struct udf_fileident_bh fibh;
843 struct fileIdentDesc *fi;
844 struct fileIdentDesc cfi;
845 struct kernel_lb_addr tloc;
846
847 retval = -ENOENT;
848 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
849
850 if (IS_ERR_OR_NULL(fi)) {
851 if (fi)
852 retval = PTR_ERR(fi);
853 goto out;
854 }
855
856 retval = -EIO;
857 tloc = lelb_to_cpu(cfi.icb.extLocation);
858 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
859 goto end_unlink;
860
861 if (!inode->i_nlink) {
862 udf_debug("Deleting nonexistent file (%lu), %u\n",
863 inode->i_ino, inode->i_nlink);
864 set_nlink(inode, 1);
865 }
866 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
867 if (retval)
868 goto end_unlink;
869 dir->i_ctime = dir->i_mtime = current_time(dir);
870 mark_inode_dirty(dir);
871 inode_dec_link_count(inode);
872 inode->i_ctime = dir->i_ctime;
873 retval = 0;
874
875end_unlink:
876 if (fibh.sbh != fibh.ebh)
877 brelse(fibh.ebh);
878 brelse(fibh.sbh);
879
880out:
881 return retval;
882}
883
884static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir,
885 struct dentry *dentry, const char *symname)
886{
887 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
888 struct pathComponent *pc;
889 const char *compstart;
890 struct extent_position epos = {};
891 int eoffset, elen = 0;
892 uint8_t *ea;
893 int err;
894 udf_pblk_t block;
895 unsigned char *name = NULL;
896 int namelen;
897 struct udf_inode_info *iinfo;
898 struct super_block *sb = dir->i_sb;
899
900 if (IS_ERR(inode))
901 return PTR_ERR(inode);
902
903 iinfo = UDF_I(inode);
904 down_write(&iinfo->i_data_sem);
905 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
906 if (!name) {
907 err = -ENOMEM;
908 goto out_no_entry;
909 }
910
911 inode->i_data.a_ops = &udf_symlink_aops;
912 inode->i_op = &udf_symlink_inode_operations;
913 inode_nohighmem(inode);
914
915 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
916 struct kernel_lb_addr eloc;
917 uint32_t bsize;
918
919 block = udf_new_block(sb, inode,
920 iinfo->i_location.partitionReferenceNum,
921 iinfo->i_location.logicalBlockNum, &err);
922 if (!block)
923 goto out_no_entry;
924 epos.block = iinfo->i_location;
925 epos.offset = udf_file_entry_alloc_offset(inode);
926 epos.bh = NULL;
927 eloc.logicalBlockNum = block;
928 eloc.partitionReferenceNum =
929 iinfo->i_location.partitionReferenceNum;
930 bsize = sb->s_blocksize;
931 iinfo->i_lenExtents = bsize;
932 udf_add_aext(inode, &epos, &eloc, bsize, 0);
933 brelse(epos.bh);
934
935 block = udf_get_pblock(sb, block,
936 iinfo->i_location.partitionReferenceNum,
937 0);
938 epos.bh = udf_tgetblk(sb, block);
939 if (unlikely(!epos.bh)) {
940 err = -ENOMEM;
941 goto out_no_entry;
942 }
943 lock_buffer(epos.bh);
944 memset(epos.bh->b_data, 0x00, bsize);
945 set_buffer_uptodate(epos.bh);
946 unlock_buffer(epos.bh);
947 mark_buffer_dirty_inode(epos.bh, inode);
948 ea = epos.bh->b_data + udf_ext0_offset(inode);
949 } else
950 ea = iinfo->i_data + iinfo->i_lenEAttr;
951
952 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
953 pc = (struct pathComponent *)ea;
954
955 if (*symname == '/') {
956 do {
957 symname++;
958 } while (*symname == '/');
959
960 pc->componentType = 1;
961 pc->lengthComponentIdent = 0;
962 pc->componentFileVersionNum = 0;
963 elen += sizeof(struct pathComponent);
964 }
965
966 err = -ENAMETOOLONG;
967
968 while (*symname) {
969 if (elen + sizeof(struct pathComponent) > eoffset)
970 goto out_no_entry;
971
972 pc = (struct pathComponent *)(ea + elen);
973
974 compstart = symname;
975
976 do {
977 symname++;
978 } while (*symname && *symname != '/');
979
980 pc->componentType = 5;
981 pc->lengthComponentIdent = 0;
982 pc->componentFileVersionNum = 0;
983 if (compstart[0] == '.') {
984 if ((symname - compstart) == 1)
985 pc->componentType = 4;
986 else if ((symname - compstart) == 2 &&
987 compstart[1] == '.')
988 pc->componentType = 3;
989 }
990
991 if (pc->componentType == 5) {
992 namelen = udf_put_filename(sb, compstart,
993 symname - compstart,
994 name, UDF_NAME_LEN_CS0);
995 if (!namelen)
996 goto out_no_entry;
997
998 if (elen + sizeof(struct pathComponent) + namelen >
999 eoffset)
1000 goto out_no_entry;
1001 else
1002 pc->lengthComponentIdent = namelen;
1003
1004 memcpy(pc->componentIdent, name, namelen);
1005 }
1006
1007 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1008
1009 if (*symname) {
1010 do {
1011 symname++;
1012 } while (*symname == '/');
1013 }
1014 }
1015
1016 brelse(epos.bh);
1017 inode->i_size = elen;
1018 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1019 iinfo->i_lenAlloc = inode->i_size;
1020 else
1021 udf_truncate_tail_extent(inode);
1022 mark_inode_dirty(inode);
1023 up_write(&iinfo->i_data_sem);
1024
1025 err = udf_add_nondir(dentry, inode);
1026out:
1027 kfree(name);
1028 return err;
1029
1030out_no_entry:
1031 up_write(&iinfo->i_data_sem);
1032 inode_dec_link_count(inode);
1033 discard_new_inode(inode);
1034 goto out;
1035}
1036
1037static int udf_link(struct dentry *old_dentry, struct inode *dir,
1038 struct dentry *dentry)
1039{
1040 struct inode *inode = d_inode(old_dentry);
1041 struct udf_fileident_bh fibh;
1042 struct fileIdentDesc cfi, *fi;
1043 int err;
1044
1045 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1046 if (!fi) {
1047 return err;
1048 }
1049 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1050 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1051 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1052 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1053 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1054 }
1055 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1056 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1057 mark_inode_dirty(dir);
1058
1059 if (fibh.sbh != fibh.ebh)
1060 brelse(fibh.ebh);
1061 brelse(fibh.sbh);
1062 inc_nlink(inode);
1063 inode->i_ctime = current_time(inode);
1064 mark_inode_dirty(inode);
1065 dir->i_ctime = dir->i_mtime = current_time(dir);
1066 mark_inode_dirty(dir);
1067 ihold(inode);
1068 d_instantiate(dentry, inode);
1069
1070 return 0;
1071}
1072
1073/* Anybody can rename anything with this: the permission checks are left to the
1074 * higher-level routines.
1075 */
1076static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1077 struct dentry *old_dentry, struct inode *new_dir,
1078 struct dentry *new_dentry, unsigned int flags)
1079{
1080 struct inode *old_inode = d_inode(old_dentry);
1081 struct inode *new_inode = d_inode(new_dentry);
1082 struct udf_fileident_bh ofibh, nfibh;
1083 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1084 struct fileIdentDesc ocfi, ncfi;
1085 struct buffer_head *dir_bh = NULL;
1086 int retval = -ENOENT;
1087 struct kernel_lb_addr tloc;
1088 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1089
1090 if (flags & ~RENAME_NOREPLACE)
1091 return -EINVAL;
1092
1093 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1094 if (!ofi || IS_ERR(ofi)) {
1095 if (IS_ERR(ofi))
1096 retval = PTR_ERR(ofi);
1097 goto end_rename;
1098 }
1099
1100 if (ofibh.sbh != ofibh.ebh)
1101 brelse(ofibh.ebh);
1102
1103 brelse(ofibh.sbh);
1104 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1105 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino)
1106 goto end_rename;
1107
1108 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1109 if (IS_ERR(nfi)) {
1110 retval = PTR_ERR(nfi);
1111 goto end_rename;
1112 }
1113 if (nfi && !new_inode) {
1114 if (nfibh.sbh != nfibh.ebh)
1115 brelse(nfibh.ebh);
1116 brelse(nfibh.sbh);
1117 nfi = NULL;
1118 }
1119 if (S_ISDIR(old_inode->i_mode)) {
1120 int offset = udf_ext0_offset(old_inode);
1121
1122 if (new_inode) {
1123 retval = -ENOTEMPTY;
1124 if (!empty_dir(new_inode))
1125 goto end_rename;
1126 }
1127 retval = -EIO;
1128 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1129 dir_fi = udf_get_fileident(
1130 old_iinfo->i_data -
1131 (old_iinfo->i_efe ?
1132 sizeof(struct extendedFileEntry) :
1133 sizeof(struct fileEntry)),
1134 old_inode->i_sb->s_blocksize, &offset);
1135 } else {
1136 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1137 if (!dir_bh)
1138 goto end_rename;
1139 dir_fi = udf_get_fileident(dir_bh->b_data,
1140 old_inode->i_sb->s_blocksize, &offset);
1141 }
1142 if (!dir_fi)
1143 goto end_rename;
1144 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1145 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1146 old_dir->i_ino)
1147 goto end_rename;
1148 }
1149 if (!nfi) {
1150 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1151 &retval);
1152 if (!nfi)
1153 goto end_rename;
1154 }
1155
1156 /*
1157 * Like most other Unix systems, set the ctime for inodes on a
1158 * rename.
1159 */
1160 old_inode->i_ctime = current_time(old_inode);
1161 mark_inode_dirty(old_inode);
1162
1163 /*
1164 * ok, that's it
1165 */
1166 ncfi.fileVersionNum = ocfi.fileVersionNum;
1167 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1168 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1169 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1170
1171 /* The old fid may have moved - find it again */
1172 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1173 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1174
1175 if (new_inode) {
1176 new_inode->i_ctime = current_time(new_inode);
1177 inode_dec_link_count(new_inode);
1178 }
1179 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1180 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1181 mark_inode_dirty(old_dir);
1182 mark_inode_dirty(new_dir);
1183
1184 if (dir_fi) {
1185 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1186 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1187 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1188 mark_inode_dirty(old_inode);
1189 else
1190 mark_buffer_dirty_inode(dir_bh, old_inode);
1191
1192 inode_dec_link_count(old_dir);
1193 if (new_inode)
1194 inode_dec_link_count(new_inode);
1195 else {
1196 inc_nlink(new_dir);
1197 mark_inode_dirty(new_dir);
1198 }
1199 }
1200
1201 if (ofi) {
1202 if (ofibh.sbh != ofibh.ebh)
1203 brelse(ofibh.ebh);
1204 brelse(ofibh.sbh);
1205 }
1206
1207 retval = 0;
1208
1209end_rename:
1210 brelse(dir_bh);
1211 if (nfi) {
1212 if (nfibh.sbh != nfibh.ebh)
1213 brelse(nfibh.ebh);
1214 brelse(nfibh.sbh);
1215 }
1216
1217 return retval;
1218}
1219
1220static struct dentry *udf_get_parent(struct dentry *child)
1221{
1222 struct kernel_lb_addr tloc;
1223 struct inode *inode = NULL;
1224 struct fileIdentDesc cfi;
1225 struct udf_fileident_bh fibh;
1226
1227 if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi))
1228 return ERR_PTR(-EACCES);
1229
1230 if (fibh.sbh != fibh.ebh)
1231 brelse(fibh.ebh);
1232 brelse(fibh.sbh);
1233
1234 tloc = lelb_to_cpu(cfi.icb.extLocation);
1235 inode = udf_iget(child->d_sb, &tloc);
1236 if (IS_ERR(inode))
1237 return ERR_CAST(inode);
1238
1239 return d_obtain_alias(inode);
1240}
1241
1242
1243static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1244 u16 partref, __u32 generation)
1245{
1246 struct inode *inode;
1247 struct kernel_lb_addr loc;
1248
1249 if (block == 0)
1250 return ERR_PTR(-ESTALE);
1251
1252 loc.logicalBlockNum = block;
1253 loc.partitionReferenceNum = partref;
1254 inode = udf_iget(sb, &loc);
1255
1256 if (IS_ERR(inode))
1257 return ERR_CAST(inode);
1258
1259 if (generation && inode->i_generation != generation) {
1260 iput(inode);
1261 return ERR_PTR(-ESTALE);
1262 }
1263 return d_obtain_alias(inode);
1264}
1265
1266static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1267 struct fid *fid, int fh_len, int fh_type)
1268{
1269 if (fh_len < 3 ||
1270 (fh_type != FILEID_UDF_WITH_PARENT &&
1271 fh_type != FILEID_UDF_WITHOUT_PARENT))
1272 return NULL;
1273
1274 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1275 fid->udf.generation);
1276}
1277
1278static struct dentry *udf_fh_to_parent(struct super_block *sb,
1279 struct fid *fid, int fh_len, int fh_type)
1280{
1281 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1282 return NULL;
1283
1284 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1285 fid->udf.parent_partref,
1286 fid->udf.parent_generation);
1287}
1288static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1289 struct inode *parent)
1290{
1291 int len = *lenp;
1292 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1293 struct fid *fid = (struct fid *)fh;
1294 int type = FILEID_UDF_WITHOUT_PARENT;
1295
1296 if (parent && (len < 5)) {
1297 *lenp = 5;
1298 return FILEID_INVALID;
1299 } else if (len < 3) {
1300 *lenp = 3;
1301 return FILEID_INVALID;
1302 }
1303
1304 *lenp = 3;
1305 fid->udf.block = location.logicalBlockNum;
1306 fid->udf.partref = location.partitionReferenceNum;
1307 fid->udf.parent_partref = 0;
1308 fid->udf.generation = inode->i_generation;
1309
1310 if (parent) {
1311 location = UDF_I(parent)->i_location;
1312 fid->udf.parent_block = location.logicalBlockNum;
1313 fid->udf.parent_partref = location.partitionReferenceNum;
1314 fid->udf.parent_generation = inode->i_generation;
1315 *lenp = 5;
1316 type = FILEID_UDF_WITH_PARENT;
1317 }
1318
1319 return type;
1320}
1321
1322const struct export_operations udf_export_ops = {
1323 .encode_fh = udf_encode_fh,
1324 .fh_to_dentry = udf_fh_to_dentry,
1325 .fh_to_parent = udf_fh_to_parent,
1326 .get_parent = udf_get_parent,
1327};
1328
1329const struct inode_operations udf_dir_inode_operations = {
1330 .lookup = udf_lookup,
1331 .create = udf_create,
1332 .link = udf_link,
1333 .unlink = udf_unlink,
1334 .symlink = udf_symlink,
1335 .mkdir = udf_mkdir,
1336 .rmdir = udf_rmdir,
1337 .mknod = udf_mknod,
1338 .rename = udf_rename,
1339 .tmpfile = udf_tmpfile,
1340};