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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
34static inline int udf_match(int len1, const unsigned char *name1, int len2,
35 const unsigned char *name2)
36{
37 if (len1 != len2)
38 return 0;
39
40 return !memcmp(name1, name2, len1);
41}
42
43int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
45 uint8_t *impuse, uint8_t *fileident)
46{
47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
48 uint16_t crc;
49 int offset;
50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
51 uint8_t lfi = cfi->lengthFileIdent;
52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
53 sizeof(struct fileIdentDesc);
54 int adinicb = 0;
55
56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
57 adinicb = 1;
58
59 offset = fibh->soffset + sizeof(struct fileIdentDesc);
60
61 if (impuse) {
62 if (adinicb || (offset + liu < 0)) {
63 memcpy((uint8_t *)sfi->impUse, impuse, liu);
64 } else if (offset >= 0) {
65 memcpy(fibh->ebh->b_data + offset, impuse, liu);
66 } else {
67 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
68 memcpy(fibh->ebh->b_data, impuse - offset,
69 liu + offset);
70 }
71 }
72
73 offset += liu;
74
75 if (fileident) {
76 if (adinicb || (offset + lfi < 0)) {
77 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
78 } else if (offset >= 0) {
79 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
80 } else {
81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
82 -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((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
92 } else if (offset >= 0) {
93 memset(fibh->ebh->b_data + offset, 0x00, padlen);
94 } else {
95 memset((uint8_t *)sfi->padding + 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 return 0;
139}
140
141/**
142 * udf_find_entry - find entry in given directory.
143 *
144 * @dir: directory inode to search in
145 * @child: qstr of the name
146 * @fibh: buffer head / inode with file identifier descriptor we found
147 * @cfi: found file identifier descriptor with given name
148 *
149 * This function searches in the directory @dir for a file name @child. When
150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
151 * directories) containing the file identifier descriptor (FID). In that case
152 * the function returns pointer to the FID in the buffer or inode - but note
153 * that FID may be split among two buffers (blocks) so accessing it via that
154 * pointer isn't easily possible. This pointer can be used only as an iterator
155 * for other directory manipulation functions. For inspection of the FID @cfi
156 * can be used - the found FID is copied there.
157 *
158 * Returns pointer to FID, NULL when nothing found, or error code.
159 */
160static struct fileIdentDesc *udf_find_entry(struct inode *dir,
161 const struct qstr *child,
162 struct udf_fileident_bh *fibh,
163 struct fileIdentDesc *cfi)
164{
165 struct fileIdentDesc *fi = NULL;
166 loff_t f_pos;
167 udf_pblk_t block;
168 int flen;
169 unsigned char *fname = NULL, *copy_name = NULL;
170 unsigned char *nameptr;
171 uint8_t lfi;
172 uint16_t liu;
173 loff_t size;
174 struct kernel_lb_addr eloc;
175 uint32_t elen;
176 sector_t offset;
177 struct extent_position epos = {};
178 struct udf_inode_info *dinfo = UDF_I(dir);
179 int isdotdot = child->len == 2 &&
180 child->name[0] == '.' && child->name[1] == '.';
181 struct super_block *sb = dir->i_sb;
182
183 size = udf_ext0_offset(dir) + dir->i_size;
184 f_pos = udf_ext0_offset(dir);
185
186 fibh->sbh = fibh->ebh = NULL;
187 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
188 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
189 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
190 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
191 fi = ERR_PTR(-EIO);
192 goto out_err;
193 }
194
195 block = udf_get_lb_pblock(sb, &eloc, offset);
196 if ((++offset << sb->s_blocksize_bits) < elen) {
197 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
198 epos.offset -= sizeof(struct short_ad);
199 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
200 epos.offset -= sizeof(struct long_ad);
201 } else
202 offset = 0;
203
204 fibh->sbh = fibh->ebh = udf_tread(sb, block);
205 if (!fibh->sbh) {
206 fi = ERR_PTR(-EIO);
207 goto out_err;
208 }
209 }
210
211 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
212 if (!fname) {
213 fi = ERR_PTR(-ENOMEM);
214 goto out_err;
215 }
216
217 while (f_pos < size) {
218 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
219 &elen, &offset);
220 if (!fi) {
221 fi = ERR_PTR(-EIO);
222 goto out_err;
223 }
224
225 liu = le16_to_cpu(cfi->lengthOfImpUse);
226 lfi = cfi->lengthFileIdent;
227
228 if (fibh->sbh == fibh->ebh) {
229 nameptr = fi->fileIdent + liu;
230 } else {
231 int poffset; /* Unpaded ending offset */
232
233 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
234 liu + lfi;
235
236 if (poffset >= lfi)
237 nameptr = (uint8_t *)(fibh->ebh->b_data +
238 poffset - lfi);
239 else {
240 if (!copy_name) {
241 copy_name = kmalloc(UDF_NAME_LEN,
242 GFP_NOFS);
243 if (!copy_name) {
244 fi = ERR_PTR(-ENOMEM);
245 goto out_err;
246 }
247 }
248 nameptr = copy_name;
249 memcpy(nameptr, fi->fileIdent + liu,
250 lfi - poffset);
251 memcpy(nameptr + lfi - poffset,
252 fibh->ebh->b_data, poffset);
253 }
254 }
255
256 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
257 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
258 continue;
259 }
260
261 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
262 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263 continue;
264 }
265
266 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
267 isdotdot)
268 goto out_ok;
269
270 if (!lfi)
271 continue;
272
273 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
274 if (flen < 0) {
275 fi = ERR_PTR(flen);
276 goto out_err;
277 }
278
279 if (udf_match(flen, fname, child->len, child->name))
280 goto out_ok;
281 }
282
283 fi = NULL;
284out_err:
285 if (fibh->sbh != fibh->ebh)
286 brelse(fibh->ebh);
287 brelse(fibh->sbh);
288out_ok:
289 brelse(epos.bh);
290 kfree(fname);
291 kfree(copy_name);
292
293 return fi;
294}
295
296static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
297 unsigned int flags)
298{
299 struct inode *inode = NULL;
300 struct fileIdentDesc cfi;
301 struct udf_fileident_bh fibh;
302 struct fileIdentDesc *fi;
303
304 if (dentry->d_name.len > UDF_NAME_LEN)
305 return ERR_PTR(-ENAMETOOLONG);
306
307 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
308 if (IS_ERR(fi))
309 return ERR_CAST(fi);
310
311 if (fi) {
312 struct kernel_lb_addr loc;
313
314 if (fibh.sbh != fibh.ebh)
315 brelse(fibh.ebh);
316 brelse(fibh.sbh);
317
318 loc = lelb_to_cpu(cfi.icb.extLocation);
319 inode = udf_iget(dir->i_sb, &loc);
320 if (IS_ERR(inode))
321 return ERR_CAST(inode);
322 }
323
324 return d_splice_alias(inode, dentry);
325}
326
327static struct fileIdentDesc *udf_add_entry(struct inode *dir,
328 struct dentry *dentry,
329 struct udf_fileident_bh *fibh,
330 struct fileIdentDesc *cfi, int *err)
331{
332 struct super_block *sb = dir->i_sb;
333 struct fileIdentDesc *fi = NULL;
334 unsigned char *name = NULL;
335 int namelen;
336 loff_t f_pos;
337 loff_t size = udf_ext0_offset(dir) + dir->i_size;
338 int nfidlen;
339 udf_pblk_t block;
340 struct kernel_lb_addr eloc;
341 uint32_t elen = 0;
342 sector_t offset;
343 struct extent_position epos = {};
344 struct udf_inode_info *dinfo;
345
346 fibh->sbh = fibh->ebh = NULL;
347 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
348 if (!name) {
349 *err = -ENOMEM;
350 goto out_err;
351 }
352
353 if (dentry) {
354 if (!dentry->d_name.len) {
355 *err = -EINVAL;
356 goto out_err;
357 }
358 namelen = udf_put_filename(sb, dentry->d_name.name,
359 dentry->d_name.len,
360 name, UDF_NAME_LEN_CS0);
361 if (!namelen) {
362 *err = -ENAMETOOLONG;
363 goto out_err;
364 }
365 } else {
366 namelen = 0;
367 }
368
369 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
370
371 f_pos = udf_ext0_offset(dir);
372
373 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
374 dinfo = UDF_I(dir);
375 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
376 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
377 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
378 block = udf_get_lb_pblock(dir->i_sb,
379 &dinfo->i_location, 0);
380 fibh->soffset = fibh->eoffset = sb->s_blocksize;
381 goto add;
382 }
383 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
384 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
385 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
386 epos.offset -= sizeof(struct short_ad);
387 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
388 epos.offset -= sizeof(struct long_ad);
389 } else
390 offset = 0;
391
392 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
393 if (!fibh->sbh) {
394 *err = -EIO;
395 goto out_err;
396 }
397
398 block = dinfo->i_location.logicalBlockNum;
399 }
400
401 while (f_pos < size) {
402 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
403 &elen, &offset);
404
405 if (!fi) {
406 *err = -EIO;
407 goto out_err;
408 }
409
410 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
411 if (udf_dir_entry_len(cfi) == nfidlen) {
412 cfi->descTag.tagSerialNum = cpu_to_le16(1);
413 cfi->fileVersionNum = cpu_to_le16(1);
414 cfi->fileCharacteristics = 0;
415 cfi->lengthFileIdent = namelen;
416 cfi->lengthOfImpUse = cpu_to_le16(0);
417 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
418 name))
419 goto out_ok;
420 else {
421 *err = -EIO;
422 goto out_err;
423 }
424 }
425 }
426 }
427
428add:
429 f_pos += nfidlen;
430
431 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
432 sb->s_blocksize - fibh->eoffset < nfidlen) {
433 brelse(epos.bh);
434 epos.bh = NULL;
435 fibh->soffset -= udf_ext0_offset(dir);
436 fibh->eoffset -= udf_ext0_offset(dir);
437 f_pos -= udf_ext0_offset(dir);
438 if (fibh->sbh != fibh->ebh)
439 brelse(fibh->ebh);
440 brelse(fibh->sbh);
441 fibh->sbh = fibh->ebh =
442 udf_expand_dir_adinicb(dir, &block, err);
443 if (!fibh->sbh)
444 goto out_err;
445 epos.block = dinfo->i_location;
446 epos.offset = udf_file_entry_alloc_offset(dir);
447 /* Load extent udf_expand_dir_adinicb() has created */
448 udf_current_aext(dir, &epos, &eloc, &elen, 1);
449 }
450
451 /* Entry fits into current block? */
452 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
453 fibh->soffset = fibh->eoffset;
454 fibh->eoffset += nfidlen;
455 if (fibh->sbh != fibh->ebh) {
456 brelse(fibh->sbh);
457 fibh->sbh = fibh->ebh;
458 }
459
460 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
461 block = dinfo->i_location.logicalBlockNum;
462 fi = (struct fileIdentDesc *)
463 (dinfo->i_data + fibh->soffset -
464 udf_ext0_offset(dir) +
465 dinfo->i_lenEAttr);
466 } else {
467 block = eloc.logicalBlockNum +
468 ((elen - 1) >>
469 dir->i_sb->s_blocksize_bits);
470 fi = (struct fileIdentDesc *)
471 (fibh->sbh->b_data + fibh->soffset);
472 }
473 } else {
474 /* Round up last extent in the file */
475 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
476 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
477 epos.offset -= sizeof(struct short_ad);
478 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
479 epos.offset -= sizeof(struct long_ad);
480 udf_write_aext(dir, &epos, &eloc, elen, 1);
481 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
482 - 1) & ~(sb->s_blocksize - 1);
483
484 fibh->soffset = fibh->eoffset - sb->s_blocksize;
485 fibh->eoffset += nfidlen - sb->s_blocksize;
486 if (fibh->sbh != fibh->ebh) {
487 brelse(fibh->sbh);
488 fibh->sbh = fibh->ebh;
489 }
490
491 block = eloc.logicalBlockNum + ((elen - 1) >>
492 dir->i_sb->s_blocksize_bits);
493 fibh->ebh = udf_bread(dir,
494 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
495 if (!fibh->ebh)
496 goto out_err;
497 /* Extents could have been merged, invalidate our position */
498 brelse(epos.bh);
499 epos.bh = NULL;
500 epos.block = dinfo->i_location;
501 epos.offset = udf_file_entry_alloc_offset(dir);
502
503 if (!fibh->soffset) {
504 /* Find the freshly allocated block */
505 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
506 (EXT_RECORDED_ALLOCATED >> 30))
507 ;
508 block = eloc.logicalBlockNum + ((elen - 1) >>
509 dir->i_sb->s_blocksize_bits);
510 brelse(fibh->sbh);
511 fibh->sbh = fibh->ebh;
512 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
513 } else {
514 fi = (struct fileIdentDesc *)
515 (fibh->sbh->b_data + sb->s_blocksize +
516 fibh->soffset);
517 }
518 }
519
520 memset(cfi, 0, sizeof(struct fileIdentDesc));
521 if (UDF_SB(sb)->s_udfrev >= 0x0200)
522 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
523 sizeof(struct tag));
524 else
525 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
526 sizeof(struct tag));
527 cfi->fileVersionNum = cpu_to_le16(1);
528 cfi->lengthFileIdent = namelen;
529 cfi->lengthOfImpUse = cpu_to_le16(0);
530 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
531 dir->i_size += nfidlen;
532 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
533 dinfo->i_lenAlloc += nfidlen;
534 else {
535 /* Find the last extent and truncate it to proper size */
536 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
537 (EXT_RECORDED_ALLOCATED >> 30))
538 ;
539 elen -= dinfo->i_lenExtents - dir->i_size;
540 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
541 epos.offset -= sizeof(struct short_ad);
542 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
543 epos.offset -= sizeof(struct long_ad);
544 udf_write_aext(dir, &epos, &eloc, elen, 1);
545 dinfo->i_lenExtents = dir->i_size;
546 }
547
548 mark_inode_dirty(dir);
549 goto out_ok;
550 } else {
551 *err = -EIO;
552 goto out_err;
553 }
554
555out_err:
556 fi = NULL;
557 if (fibh->sbh != fibh->ebh)
558 brelse(fibh->ebh);
559 brelse(fibh->sbh);
560out_ok:
561 brelse(epos.bh);
562 kfree(name);
563 return fi;
564}
565
566static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
567 struct udf_fileident_bh *fibh,
568 struct fileIdentDesc *cfi)
569{
570 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
571
572 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
573 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
574
575 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
576}
577
578static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
579{
580 struct udf_inode_info *iinfo = UDF_I(inode);
581 struct inode *dir = d_inode(dentry->d_parent);
582 struct udf_fileident_bh fibh;
583 struct fileIdentDesc cfi, *fi;
584 int err;
585
586 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
587 if (unlikely(!fi)) {
588 inode_dec_link_count(inode);
589 discard_new_inode(inode);
590 return err;
591 }
592 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
593 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
594 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
595 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
596 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
597 dir->i_ctime = dir->i_mtime = current_time(dir);
598 mark_inode_dirty(dir);
599 if (fibh.sbh != fibh.ebh)
600 brelse(fibh.ebh);
601 brelse(fibh.sbh);
602 d_instantiate_new(dentry, inode);
603
604 return 0;
605}
606
607static int udf_create(struct user_namespace *mnt_userns, struct inode *dir,
608 struct dentry *dentry, umode_t mode, bool excl)
609{
610 struct inode *inode = udf_new_inode(dir, mode);
611
612 if (IS_ERR(inode))
613 return PTR_ERR(inode);
614
615 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
616 inode->i_data.a_ops = &udf_adinicb_aops;
617 else
618 inode->i_data.a_ops = &udf_aops;
619 inode->i_op = &udf_file_inode_operations;
620 inode->i_fop = &udf_file_operations;
621 mark_inode_dirty(inode);
622
623 return udf_add_nondir(dentry, inode);
624}
625
626static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
627 struct dentry *dentry, umode_t mode)
628{
629 struct inode *inode = udf_new_inode(dir, mode);
630
631 if (IS_ERR(inode))
632 return PTR_ERR(inode);
633
634 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
635 inode->i_data.a_ops = &udf_adinicb_aops;
636 else
637 inode->i_data.a_ops = &udf_aops;
638 inode->i_op = &udf_file_inode_operations;
639 inode->i_fop = &udf_file_operations;
640 mark_inode_dirty(inode);
641 d_tmpfile(dentry, inode);
642 unlock_new_inode(inode);
643 return 0;
644}
645
646static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir,
647 struct dentry *dentry, umode_t mode, dev_t rdev)
648{
649 struct inode *inode;
650
651 if (!old_valid_dev(rdev))
652 return -EINVAL;
653
654 inode = udf_new_inode(dir, mode);
655 if (IS_ERR(inode))
656 return PTR_ERR(inode);
657
658 init_special_inode(inode, mode, rdev);
659 return udf_add_nondir(dentry, inode);
660}
661
662static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
663 struct dentry *dentry, umode_t mode)
664{
665 struct inode *inode;
666 struct udf_fileident_bh fibh;
667 struct fileIdentDesc cfi, *fi;
668 int err;
669 struct udf_inode_info *dinfo = UDF_I(dir);
670 struct udf_inode_info *iinfo;
671
672 inode = udf_new_inode(dir, S_IFDIR | mode);
673 if (IS_ERR(inode))
674 return PTR_ERR(inode);
675
676 iinfo = UDF_I(inode);
677 inode->i_op = &udf_dir_inode_operations;
678 inode->i_fop = &udf_dir_operations;
679 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
680 if (!fi) {
681 inode_dec_link_count(inode);
682 discard_new_inode(inode);
683 goto out;
684 }
685 set_nlink(inode, 2);
686 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
687 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
688 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
689 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
690 cfi.fileCharacteristics =
691 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
692 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
693 brelse(fibh.sbh);
694 mark_inode_dirty(inode);
695
696 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
697 if (!fi) {
698 clear_nlink(inode);
699 mark_inode_dirty(inode);
700 discard_new_inode(inode);
701 goto out;
702 }
703 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
704 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
705 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
706 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
707 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
708 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
709 inc_nlink(dir);
710 dir->i_ctime = dir->i_mtime = current_time(dir);
711 mark_inode_dirty(dir);
712 d_instantiate_new(dentry, inode);
713 if (fibh.sbh != fibh.ebh)
714 brelse(fibh.ebh);
715 brelse(fibh.sbh);
716 err = 0;
717
718out:
719 return err;
720}
721
722static int empty_dir(struct inode *dir)
723{
724 struct fileIdentDesc *fi, cfi;
725 struct udf_fileident_bh fibh;
726 loff_t f_pos;
727 loff_t size = udf_ext0_offset(dir) + dir->i_size;
728 udf_pblk_t block;
729 struct kernel_lb_addr eloc;
730 uint32_t elen;
731 sector_t offset;
732 struct extent_position epos = {};
733 struct udf_inode_info *dinfo = UDF_I(dir);
734
735 f_pos = udf_ext0_offset(dir);
736 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
737
738 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
739 fibh.sbh = fibh.ebh = NULL;
740 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
741 &epos, &eloc, &elen, &offset) ==
742 (EXT_RECORDED_ALLOCATED >> 30)) {
743 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
744 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
745 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
746 epos.offset -= sizeof(struct short_ad);
747 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
748 epos.offset -= sizeof(struct long_ad);
749 } else
750 offset = 0;
751
752 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
753 if (!fibh.sbh) {
754 brelse(epos.bh);
755 return 0;
756 }
757 } else {
758 brelse(epos.bh);
759 return 0;
760 }
761
762 while (f_pos < size) {
763 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
764 &elen, &offset);
765 if (!fi) {
766 if (fibh.sbh != fibh.ebh)
767 brelse(fibh.ebh);
768 brelse(fibh.sbh);
769 brelse(epos.bh);
770 return 0;
771 }
772
773 if (cfi.lengthFileIdent &&
774 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
775 if (fibh.sbh != fibh.ebh)
776 brelse(fibh.ebh);
777 brelse(fibh.sbh);
778 brelse(epos.bh);
779 return 0;
780 }
781 }
782
783 if (fibh.sbh != fibh.ebh)
784 brelse(fibh.ebh);
785 brelse(fibh.sbh);
786 brelse(epos.bh);
787
788 return 1;
789}
790
791static int udf_rmdir(struct inode *dir, struct dentry *dentry)
792{
793 int retval;
794 struct inode *inode = d_inode(dentry);
795 struct udf_fileident_bh fibh;
796 struct fileIdentDesc *fi, cfi;
797 struct kernel_lb_addr tloc;
798
799 retval = -ENOENT;
800 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
801 if (IS_ERR_OR_NULL(fi)) {
802 if (fi)
803 retval = PTR_ERR(fi);
804 goto out;
805 }
806
807 retval = -EIO;
808 tloc = lelb_to_cpu(cfi.icb.extLocation);
809 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
810 goto end_rmdir;
811 retval = -ENOTEMPTY;
812 if (!empty_dir(inode))
813 goto end_rmdir;
814 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
815 if (retval)
816 goto end_rmdir;
817 if (inode->i_nlink != 2)
818 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
819 inode->i_nlink);
820 clear_nlink(inode);
821 inode->i_size = 0;
822 inode_dec_link_count(dir);
823 inode->i_ctime = dir->i_ctime = dir->i_mtime =
824 current_time(inode);
825 mark_inode_dirty(dir);
826
827end_rmdir:
828 if (fibh.sbh != fibh.ebh)
829 brelse(fibh.ebh);
830 brelse(fibh.sbh);
831
832out:
833 return retval;
834}
835
836static int udf_unlink(struct inode *dir, struct dentry *dentry)
837{
838 int retval;
839 struct inode *inode = d_inode(dentry);
840 struct udf_fileident_bh fibh;
841 struct fileIdentDesc *fi;
842 struct fileIdentDesc cfi;
843 struct kernel_lb_addr tloc;
844
845 retval = -ENOENT;
846 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
847
848 if (IS_ERR_OR_NULL(fi)) {
849 if (fi)
850 retval = PTR_ERR(fi);
851 goto out;
852 }
853
854 retval = -EIO;
855 tloc = lelb_to_cpu(cfi.icb.extLocation);
856 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
857 goto end_unlink;
858
859 if (!inode->i_nlink) {
860 udf_debug("Deleting nonexistent file (%lu), %u\n",
861 inode->i_ino, inode->i_nlink);
862 set_nlink(inode, 1);
863 }
864 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
865 if (retval)
866 goto end_unlink;
867 dir->i_ctime = dir->i_mtime = current_time(dir);
868 mark_inode_dirty(dir);
869 inode_dec_link_count(inode);
870 inode->i_ctime = dir->i_ctime;
871 retval = 0;
872
873end_unlink:
874 if (fibh.sbh != fibh.ebh)
875 brelse(fibh.ebh);
876 brelse(fibh.sbh);
877
878out:
879 return retval;
880}
881
882static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir,
883 struct dentry *dentry, const char *symname)
884{
885 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
886 struct pathComponent *pc;
887 const char *compstart;
888 struct extent_position epos = {};
889 int eoffset, elen = 0;
890 uint8_t *ea;
891 int err;
892 udf_pblk_t block;
893 unsigned char *name = NULL;
894 int namelen;
895 struct udf_inode_info *iinfo;
896 struct super_block *sb = dir->i_sb;
897
898 if (IS_ERR(inode))
899 return PTR_ERR(inode);
900
901 iinfo = UDF_I(inode);
902 down_write(&iinfo->i_data_sem);
903 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
904 if (!name) {
905 err = -ENOMEM;
906 goto out_no_entry;
907 }
908
909 inode->i_data.a_ops = &udf_symlink_aops;
910 inode->i_op = &udf_symlink_inode_operations;
911 inode_nohighmem(inode);
912
913 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
914 struct kernel_lb_addr eloc;
915 uint32_t bsize;
916
917 block = udf_new_block(sb, inode,
918 iinfo->i_location.partitionReferenceNum,
919 iinfo->i_location.logicalBlockNum, &err);
920 if (!block)
921 goto out_no_entry;
922 epos.block = iinfo->i_location;
923 epos.offset = udf_file_entry_alloc_offset(inode);
924 epos.bh = NULL;
925 eloc.logicalBlockNum = block;
926 eloc.partitionReferenceNum =
927 iinfo->i_location.partitionReferenceNum;
928 bsize = sb->s_blocksize;
929 iinfo->i_lenExtents = bsize;
930 udf_add_aext(inode, &epos, &eloc, bsize, 0);
931 brelse(epos.bh);
932
933 block = udf_get_pblock(sb, block,
934 iinfo->i_location.partitionReferenceNum,
935 0);
936 epos.bh = udf_tgetblk(sb, block);
937 if (unlikely(!epos.bh)) {
938 err = -ENOMEM;
939 goto out_no_entry;
940 }
941 lock_buffer(epos.bh);
942 memset(epos.bh->b_data, 0x00, bsize);
943 set_buffer_uptodate(epos.bh);
944 unlock_buffer(epos.bh);
945 mark_buffer_dirty_inode(epos.bh, inode);
946 ea = epos.bh->b_data + udf_ext0_offset(inode);
947 } else
948 ea = iinfo->i_data + iinfo->i_lenEAttr;
949
950 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
951 pc = (struct pathComponent *)ea;
952
953 if (*symname == '/') {
954 do {
955 symname++;
956 } while (*symname == '/');
957
958 pc->componentType = 1;
959 pc->lengthComponentIdent = 0;
960 pc->componentFileVersionNum = 0;
961 elen += sizeof(struct pathComponent);
962 }
963
964 err = -ENAMETOOLONG;
965
966 while (*symname) {
967 if (elen + sizeof(struct pathComponent) > eoffset)
968 goto out_no_entry;
969
970 pc = (struct pathComponent *)(ea + elen);
971
972 compstart = symname;
973
974 do {
975 symname++;
976 } while (*symname && *symname != '/');
977
978 pc->componentType = 5;
979 pc->lengthComponentIdent = 0;
980 pc->componentFileVersionNum = 0;
981 if (compstart[0] == '.') {
982 if ((symname - compstart) == 1)
983 pc->componentType = 4;
984 else if ((symname - compstart) == 2 &&
985 compstart[1] == '.')
986 pc->componentType = 3;
987 }
988
989 if (pc->componentType == 5) {
990 namelen = udf_put_filename(sb, compstart,
991 symname - compstart,
992 name, UDF_NAME_LEN_CS0);
993 if (!namelen)
994 goto out_no_entry;
995
996 if (elen + sizeof(struct pathComponent) + namelen >
997 eoffset)
998 goto out_no_entry;
999 else
1000 pc->lengthComponentIdent = namelen;
1001
1002 memcpy(pc->componentIdent, name, namelen);
1003 }
1004
1005 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1006
1007 if (*symname) {
1008 do {
1009 symname++;
1010 } while (*symname == '/');
1011 }
1012 }
1013
1014 brelse(epos.bh);
1015 inode->i_size = elen;
1016 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1017 iinfo->i_lenAlloc = inode->i_size;
1018 else
1019 udf_truncate_tail_extent(inode);
1020 mark_inode_dirty(inode);
1021 up_write(&iinfo->i_data_sem);
1022
1023 err = udf_add_nondir(dentry, inode);
1024out:
1025 kfree(name);
1026 return err;
1027
1028out_no_entry:
1029 up_write(&iinfo->i_data_sem);
1030 inode_dec_link_count(inode);
1031 discard_new_inode(inode);
1032 goto out;
1033}
1034
1035static int udf_link(struct dentry *old_dentry, struct inode *dir,
1036 struct dentry *dentry)
1037{
1038 struct inode *inode = d_inode(old_dentry);
1039 struct udf_fileident_bh fibh;
1040 struct fileIdentDesc cfi, *fi;
1041 int err;
1042
1043 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1044 if (!fi) {
1045 return err;
1046 }
1047 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1048 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1049 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1050 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1051 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1052 }
1053 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1054 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1055 mark_inode_dirty(dir);
1056
1057 if (fibh.sbh != fibh.ebh)
1058 brelse(fibh.ebh);
1059 brelse(fibh.sbh);
1060 inc_nlink(inode);
1061 inode->i_ctime = current_time(inode);
1062 mark_inode_dirty(inode);
1063 dir->i_ctime = dir->i_mtime = current_time(dir);
1064 mark_inode_dirty(dir);
1065 ihold(inode);
1066 d_instantiate(dentry, inode);
1067
1068 return 0;
1069}
1070
1071/* Anybody can rename anything with this: the permission checks are left to the
1072 * higher-level routines.
1073 */
1074static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1075 struct dentry *old_dentry, struct inode *new_dir,
1076 struct dentry *new_dentry, unsigned int flags)
1077{
1078 struct inode *old_inode = d_inode(old_dentry);
1079 struct inode *new_inode = d_inode(new_dentry);
1080 struct udf_fileident_bh ofibh, nfibh;
1081 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1082 struct fileIdentDesc ocfi, ncfi;
1083 struct buffer_head *dir_bh = NULL;
1084 int retval = -ENOENT;
1085 struct kernel_lb_addr tloc;
1086 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1087
1088 if (flags & ~RENAME_NOREPLACE)
1089 return -EINVAL;
1090
1091 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1092 if (IS_ERR(ofi)) {
1093 retval = PTR_ERR(ofi);
1094 goto end_rename;
1095 }
1096
1097 if (ofibh.sbh != ofibh.ebh)
1098 brelse(ofibh.ebh);
1099
1100 brelse(ofibh.sbh);
1101 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1102 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1103 != old_inode->i_ino)
1104 goto end_rename;
1105
1106 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1107 if (IS_ERR(nfi)) {
1108 retval = PTR_ERR(nfi);
1109 goto end_rename;
1110 }
1111 if (nfi && !new_inode) {
1112 if (nfibh.sbh != nfibh.ebh)
1113 brelse(nfibh.ebh);
1114 brelse(nfibh.sbh);
1115 nfi = NULL;
1116 }
1117 if (S_ISDIR(old_inode->i_mode)) {
1118 int offset = udf_ext0_offset(old_inode);
1119
1120 if (new_inode) {
1121 retval = -ENOTEMPTY;
1122 if (!empty_dir(new_inode))
1123 goto end_rename;
1124 }
1125 retval = -EIO;
1126 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1127 dir_fi = udf_get_fileident(
1128 old_iinfo->i_data -
1129 (old_iinfo->i_efe ?
1130 sizeof(struct extendedFileEntry) :
1131 sizeof(struct fileEntry)),
1132 old_inode->i_sb->s_blocksize, &offset);
1133 } else {
1134 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1135 if (!dir_bh)
1136 goto end_rename;
1137 dir_fi = udf_get_fileident(dir_bh->b_data,
1138 old_inode->i_sb->s_blocksize, &offset);
1139 }
1140 if (!dir_fi)
1141 goto end_rename;
1142 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1143 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1144 old_dir->i_ino)
1145 goto end_rename;
1146 }
1147 if (!nfi) {
1148 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1149 &retval);
1150 if (!nfi)
1151 goto end_rename;
1152 }
1153
1154 /*
1155 * Like most other Unix systems, set the ctime for inodes on a
1156 * rename.
1157 */
1158 old_inode->i_ctime = current_time(old_inode);
1159 mark_inode_dirty(old_inode);
1160
1161 /*
1162 * ok, that's it
1163 */
1164 ncfi.fileVersionNum = ocfi.fileVersionNum;
1165 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1166 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1167 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1168
1169 /* The old fid may have moved - find it again */
1170 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1171 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1172
1173 if (new_inode) {
1174 new_inode->i_ctime = current_time(new_inode);
1175 inode_dec_link_count(new_inode);
1176 }
1177 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1178 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1179 mark_inode_dirty(old_dir);
1180 mark_inode_dirty(new_dir);
1181
1182 if (dir_fi) {
1183 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1184 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1185 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1186 mark_inode_dirty(old_inode);
1187 else
1188 mark_buffer_dirty_inode(dir_bh, old_inode);
1189
1190 inode_dec_link_count(old_dir);
1191 if (new_inode)
1192 inode_dec_link_count(new_inode);
1193 else {
1194 inc_nlink(new_dir);
1195 mark_inode_dirty(new_dir);
1196 }
1197 }
1198
1199 if (ofi) {
1200 if (ofibh.sbh != ofibh.ebh)
1201 brelse(ofibh.ebh);
1202 brelse(ofibh.sbh);
1203 }
1204
1205 retval = 0;
1206
1207end_rename:
1208 brelse(dir_bh);
1209 if (nfi) {
1210 if (nfibh.sbh != nfibh.ebh)
1211 brelse(nfibh.ebh);
1212 brelse(nfibh.sbh);
1213 }
1214
1215 return retval;
1216}
1217
1218static struct dentry *udf_get_parent(struct dentry *child)
1219{
1220 struct kernel_lb_addr tloc;
1221 struct inode *inode = NULL;
1222 struct fileIdentDesc cfi;
1223 struct udf_fileident_bh fibh;
1224
1225 if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi))
1226 return ERR_PTR(-EACCES);
1227
1228 if (fibh.sbh != fibh.ebh)
1229 brelse(fibh.ebh);
1230 brelse(fibh.sbh);
1231
1232 tloc = lelb_to_cpu(cfi.icb.extLocation);
1233 inode = udf_iget(child->d_sb, &tloc);
1234 if (IS_ERR(inode))
1235 return ERR_CAST(inode);
1236
1237 return d_obtain_alias(inode);
1238}
1239
1240
1241static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1242 u16 partref, __u32 generation)
1243{
1244 struct inode *inode;
1245 struct kernel_lb_addr loc;
1246
1247 if (block == 0)
1248 return ERR_PTR(-ESTALE);
1249
1250 loc.logicalBlockNum = block;
1251 loc.partitionReferenceNum = partref;
1252 inode = udf_iget(sb, &loc);
1253
1254 if (IS_ERR(inode))
1255 return ERR_CAST(inode);
1256
1257 if (generation && inode->i_generation != generation) {
1258 iput(inode);
1259 return ERR_PTR(-ESTALE);
1260 }
1261 return d_obtain_alias(inode);
1262}
1263
1264static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1265 struct fid *fid, int fh_len, int fh_type)
1266{
1267 if (fh_len < 3 ||
1268 (fh_type != FILEID_UDF_WITH_PARENT &&
1269 fh_type != FILEID_UDF_WITHOUT_PARENT))
1270 return NULL;
1271
1272 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1273 fid->udf.generation);
1274}
1275
1276static struct dentry *udf_fh_to_parent(struct super_block *sb,
1277 struct fid *fid, int fh_len, int fh_type)
1278{
1279 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1280 return NULL;
1281
1282 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1283 fid->udf.parent_partref,
1284 fid->udf.parent_generation);
1285}
1286static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1287 struct inode *parent)
1288{
1289 int len = *lenp;
1290 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1291 struct fid *fid = (struct fid *)fh;
1292 int type = FILEID_UDF_WITHOUT_PARENT;
1293
1294 if (parent && (len < 5)) {
1295 *lenp = 5;
1296 return FILEID_INVALID;
1297 } else if (len < 3) {
1298 *lenp = 3;
1299 return FILEID_INVALID;
1300 }
1301
1302 *lenp = 3;
1303 fid->udf.block = location.logicalBlockNum;
1304 fid->udf.partref = location.partitionReferenceNum;
1305 fid->udf.parent_partref = 0;
1306 fid->udf.generation = inode->i_generation;
1307
1308 if (parent) {
1309 location = UDF_I(parent)->i_location;
1310 fid->udf.parent_block = location.logicalBlockNum;
1311 fid->udf.parent_partref = location.partitionReferenceNum;
1312 fid->udf.parent_generation = inode->i_generation;
1313 *lenp = 5;
1314 type = FILEID_UDF_WITH_PARENT;
1315 }
1316
1317 return type;
1318}
1319
1320const struct export_operations udf_export_ops = {
1321 .encode_fh = udf_encode_fh,
1322 .fh_to_dentry = udf_fh_to_dentry,
1323 .fh_to_parent = udf_fh_to_parent,
1324 .get_parent = udf_get_parent,
1325};
1326
1327const struct inode_operations udf_dir_inode_operations = {
1328 .lookup = udf_lookup,
1329 .create = udf_create,
1330 .link = udf_link,
1331 .unlink = udf_unlink,
1332 .symlink = udf_symlink,
1333 .mkdir = udf_mkdir,
1334 .rmdir = udf_rmdir,
1335 .mknod = udf_mknod,
1336 .rename = udf_rename,
1337 .tmpfile = udf_tmpfile,
1338};