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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/buffer_head.h>
31#include <linux/sched.h>
32#include <linux/crc-itu-t.h>
33#include <linux/exportfs.h>
34
35static inline int udf_match(int len1, const unsigned char *name1, int len2,
36 const unsigned char *name2)
37{
38 if (len1 != len2)
39 return 0;
40
41 return !memcmp(name1, name2, len1);
42}
43
44int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
45 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
46 uint8_t *impuse, uint8_t *fileident)
47{
48 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
49 uint16_t crc;
50 int offset;
51 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
52 uint8_t lfi = cfi->lengthFileIdent;
53 int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
54 sizeof(struct fileIdentDesc);
55 int adinicb = 0;
56
57 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
58 adinicb = 1;
59
60 offset = fibh->soffset + sizeof(struct fileIdentDesc);
61
62 if (impuse) {
63 if (adinicb || (offset + liu < 0)) {
64 memcpy((uint8_t *)sfi->impUse, impuse, liu);
65 } else if (offset >= 0) {
66 memcpy(fibh->ebh->b_data + offset, impuse, liu);
67 } else {
68 memcpy((uint8_t *)sfi->impUse, impuse, -offset);
69 memcpy(fibh->ebh->b_data, impuse - offset,
70 liu + offset);
71 }
72 }
73
74 offset += liu;
75
76 if (fileident) {
77 if (adinicb || (offset + lfi < 0)) {
78 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
79 } else if (offset >= 0) {
80 memcpy(fibh->ebh->b_data + offset, fileident, lfi);
81 } else {
82 memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
83 -offset);
84 memcpy(fibh->ebh->b_data, fileident - offset,
85 lfi + offset);
86 }
87 }
88
89 offset += lfi;
90
91 if (adinicb || (offset + padlen < 0)) {
92 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
93 } else if (offset >= 0) {
94 memset(fibh->ebh->b_data + offset, 0x00, padlen);
95 } else {
96 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
97 memset(fibh->ebh->b_data, 0x00, padlen + offset);
98 }
99
100 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
101 sizeof(struct fileIdentDesc) - sizeof(struct tag));
102
103 if (fibh->sbh == fibh->ebh) {
104 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
105 crclen + sizeof(struct tag) -
106 sizeof(struct fileIdentDesc));
107 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
108 crc = crc_itu_t(crc, fibh->ebh->b_data +
109 sizeof(struct fileIdentDesc) +
110 fibh->soffset,
111 crclen + sizeof(struct tag) -
112 sizeof(struct fileIdentDesc));
113 } else {
114 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
115 -fibh->soffset - sizeof(struct fileIdentDesc));
116 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
117 }
118
119 cfi->descTag.descCRC = cpu_to_le16(crc);
120 cfi->descTag.descCRCLength = cpu_to_le16(crclen);
121 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
122
123 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
124 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
125 sizeof(struct fileIdentDesc));
126 } else {
127 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
128 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
129 sizeof(struct fileIdentDesc) + fibh->soffset);
130 }
131
132 if (adinicb) {
133 mark_inode_dirty(inode);
134 } else {
135 if (fibh->sbh != fibh->ebh)
136 mark_buffer_dirty_inode(fibh->ebh, inode);
137 mark_buffer_dirty_inode(fibh->sbh, inode);
138 }
139 return 0;
140}
141
142static struct fileIdentDesc *udf_find_entry(struct inode *dir,
143 const struct qstr *child,
144 struct udf_fileident_bh *fibh,
145 struct fileIdentDesc *cfi)
146{
147 struct fileIdentDesc *fi = NULL;
148 loff_t f_pos;
149 int block, flen;
150 unsigned char *fname = NULL;
151 unsigned char *nameptr;
152 uint8_t lfi;
153 uint16_t liu;
154 loff_t size;
155 struct kernel_lb_addr eloc;
156 uint32_t elen;
157 sector_t offset;
158 struct extent_position epos = {};
159 struct udf_inode_info *dinfo = UDF_I(dir);
160 int isdotdot = child->len == 2 &&
161 child->name[0] == '.' && child->name[1] == '.';
162
163 size = udf_ext0_offset(dir) + dir->i_size;
164 f_pos = udf_ext0_offset(dir);
165
166 fibh->sbh = fibh->ebh = NULL;
167 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
168 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
169 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
170 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
171 goto out_err;
172 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
173 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
174 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
175 epos.offset -= sizeof(struct short_ad);
176 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
177 epos.offset -= sizeof(struct long_ad);
178 } else
179 offset = 0;
180
181 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
182 if (!fibh->sbh)
183 goto out_err;
184 }
185
186 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
187 if (!fname)
188 goto out_err;
189
190 while (f_pos < size) {
191 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
192 &elen, &offset);
193 if (!fi)
194 goto out_err;
195
196 liu = le16_to_cpu(cfi->lengthOfImpUse);
197 lfi = cfi->lengthFileIdent;
198
199 if (fibh->sbh == fibh->ebh) {
200 nameptr = fi->fileIdent + liu;
201 } else {
202 int poffset; /* Unpaded ending offset */
203
204 poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
205 liu + lfi;
206
207 if (poffset >= lfi)
208 nameptr = (uint8_t *)(fibh->ebh->b_data +
209 poffset - lfi);
210 else {
211 nameptr = fname;
212 memcpy(nameptr, fi->fileIdent + liu,
213 lfi - poffset);
214 memcpy(nameptr + lfi - poffset,
215 fibh->ebh->b_data, poffset);
216 }
217 }
218
219 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
220 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
221 continue;
222 }
223
224 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
225 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
226 continue;
227 }
228
229 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
230 isdotdot)
231 goto out_ok;
232
233 if (!lfi)
234 continue;
235
236 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
237 if (flen && udf_match(flen, fname, child->len, child->name))
238 goto out_ok;
239 }
240
241out_err:
242 fi = NULL;
243 if (fibh->sbh != fibh->ebh)
244 brelse(fibh->ebh);
245 brelse(fibh->sbh);
246out_ok:
247 brelse(epos.bh);
248 kfree(fname);
249
250 return fi;
251}
252
253static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
254 struct nameidata *nd)
255{
256 struct inode *inode = NULL;
257 struct fileIdentDesc cfi;
258 struct udf_fileident_bh fibh;
259
260 if (dentry->d_name.len > UDF_NAME_LEN - 2)
261 return ERR_PTR(-ENAMETOOLONG);
262
263#ifdef UDF_RECOVERY
264 /* temporary shorthand for specifying files by inode number */
265 if (!strncmp(dentry->d_name.name, ".B=", 3)) {
266 struct kernel_lb_addr lb = {
267 .logicalBlockNum = 0,
268 .partitionReferenceNum =
269 simple_strtoul(dentry->d_name.name + 3,
270 NULL, 0),
271 };
272 inode = udf_iget(dir->i_sb, lb);
273 if (!inode) {
274 return ERR_PTR(-EACCES);
275 }
276 } else
277#endif /* UDF_RECOVERY */
278
279 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
280 struct kernel_lb_addr loc;
281
282 if (fibh.sbh != fibh.ebh)
283 brelse(fibh.ebh);
284 brelse(fibh.sbh);
285
286 loc = lelb_to_cpu(cfi.icb.extLocation);
287 inode = udf_iget(dir->i_sb, &loc);
288 if (!inode) {
289 return ERR_PTR(-EACCES);
290 }
291 }
292
293 return d_splice_alias(inode, dentry);
294}
295
296static struct fileIdentDesc *udf_add_entry(struct inode *dir,
297 struct dentry *dentry,
298 struct udf_fileident_bh *fibh,
299 struct fileIdentDesc *cfi, int *err)
300{
301 struct super_block *sb = dir->i_sb;
302 struct fileIdentDesc *fi = NULL;
303 unsigned char *name = NULL;
304 int namelen;
305 loff_t f_pos;
306 loff_t size = udf_ext0_offset(dir) + dir->i_size;
307 int nfidlen;
308 uint8_t lfi;
309 uint16_t liu;
310 int block;
311 struct kernel_lb_addr eloc;
312 uint32_t elen = 0;
313 sector_t offset;
314 struct extent_position epos = {};
315 struct udf_inode_info *dinfo;
316
317 fibh->sbh = fibh->ebh = NULL;
318 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
319 if (!name) {
320 *err = -ENOMEM;
321 goto out_err;
322 }
323
324 if (dentry) {
325 if (!dentry->d_name.len) {
326 *err = -EINVAL;
327 goto out_err;
328 }
329 namelen = udf_put_filename(sb, dentry->d_name.name, name,
330 dentry->d_name.len);
331 if (!namelen) {
332 *err = -ENAMETOOLONG;
333 goto out_err;
334 }
335 } else {
336 namelen = 0;
337 }
338
339 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
340
341 f_pos = udf_ext0_offset(dir);
342
343 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
344 dinfo = UDF_I(dir);
345 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
346 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
347 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
348 block = udf_get_lb_pblock(dir->i_sb,
349 &dinfo->i_location, 0);
350 fibh->soffset = fibh->eoffset = sb->s_blocksize;
351 goto add;
352 }
353 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
354 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
355 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
356 epos.offset -= sizeof(struct short_ad);
357 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
358 epos.offset -= sizeof(struct long_ad);
359 } else
360 offset = 0;
361
362 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
363 if (!fibh->sbh) {
364 *err = -EIO;
365 goto out_err;
366 }
367
368 block = dinfo->i_location.logicalBlockNum;
369 }
370
371 while (f_pos < size) {
372 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
373 &elen, &offset);
374
375 if (!fi) {
376 *err = -EIO;
377 goto out_err;
378 }
379
380 liu = le16_to_cpu(cfi->lengthOfImpUse);
381 lfi = cfi->lengthFileIdent;
382
383 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
384 if (((sizeof(struct fileIdentDesc) +
385 liu + lfi + 3) & ~3) == nfidlen) {
386 cfi->descTag.tagSerialNum = cpu_to_le16(1);
387 cfi->fileVersionNum = cpu_to_le16(1);
388 cfi->fileCharacteristics = 0;
389 cfi->lengthFileIdent = namelen;
390 cfi->lengthOfImpUse = cpu_to_le16(0);
391 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
392 name))
393 goto out_ok;
394 else {
395 *err = -EIO;
396 goto out_err;
397 }
398 }
399 }
400 }
401
402add:
403 f_pos += nfidlen;
404
405 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
406 sb->s_blocksize - fibh->eoffset < nfidlen) {
407 brelse(epos.bh);
408 epos.bh = NULL;
409 fibh->soffset -= udf_ext0_offset(dir);
410 fibh->eoffset -= udf_ext0_offset(dir);
411 f_pos -= udf_ext0_offset(dir);
412 if (fibh->sbh != fibh->ebh)
413 brelse(fibh->ebh);
414 brelse(fibh->sbh);
415 fibh->sbh = fibh->ebh =
416 udf_expand_dir_adinicb(dir, &block, err);
417 if (!fibh->sbh)
418 goto out_err;
419 epos.block = dinfo->i_location;
420 epos.offset = udf_file_entry_alloc_offset(dir);
421 /* Load extent udf_expand_dir_adinicb() has created */
422 udf_current_aext(dir, &epos, &eloc, &elen, 1);
423 }
424
425 /* Entry fits into current block? */
426 if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
427 fibh->soffset = fibh->eoffset;
428 fibh->eoffset += nfidlen;
429 if (fibh->sbh != fibh->ebh) {
430 brelse(fibh->sbh);
431 fibh->sbh = fibh->ebh;
432 }
433
434 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
435 block = dinfo->i_location.logicalBlockNum;
436 fi = (struct fileIdentDesc *)
437 (dinfo->i_ext.i_data +
438 fibh->soffset -
439 udf_ext0_offset(dir) +
440 dinfo->i_lenEAttr);
441 } else {
442 block = eloc.logicalBlockNum +
443 ((elen - 1) >>
444 dir->i_sb->s_blocksize_bits);
445 fi = (struct fileIdentDesc *)
446 (fibh->sbh->b_data + fibh->soffset);
447 }
448 } else {
449 /* Round up last extent in the file */
450 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
451 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
452 epos.offset -= sizeof(struct short_ad);
453 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
454 epos.offset -= sizeof(struct long_ad);
455 udf_write_aext(dir, &epos, &eloc, elen, 1);
456 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
457 - 1) & ~(sb->s_blocksize - 1);
458
459 fibh->soffset = fibh->eoffset - sb->s_blocksize;
460 fibh->eoffset += nfidlen - sb->s_blocksize;
461 if (fibh->sbh != fibh->ebh) {
462 brelse(fibh->sbh);
463 fibh->sbh = fibh->ebh;
464 }
465
466 block = eloc.logicalBlockNum + ((elen - 1) >>
467 dir->i_sb->s_blocksize_bits);
468 fibh->ebh = udf_bread(dir,
469 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
470 if (!fibh->ebh)
471 goto out_err;
472 /* Extents could have been merged, invalidate our position */
473 brelse(epos.bh);
474 epos.bh = NULL;
475 epos.block = dinfo->i_location;
476 epos.offset = udf_file_entry_alloc_offset(dir);
477
478 if (!fibh->soffset) {
479 /* Find the freshly allocated block */
480 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
481 (EXT_RECORDED_ALLOCATED >> 30))
482 ;
483 block = eloc.logicalBlockNum + ((elen - 1) >>
484 dir->i_sb->s_blocksize_bits);
485 brelse(fibh->sbh);
486 fibh->sbh = fibh->ebh;
487 fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
488 } else {
489 fi = (struct fileIdentDesc *)
490 (fibh->sbh->b_data + sb->s_blocksize +
491 fibh->soffset);
492 }
493 }
494
495 memset(cfi, 0, sizeof(struct fileIdentDesc));
496 if (UDF_SB(sb)->s_udfrev >= 0x0200)
497 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
498 sizeof(struct tag));
499 else
500 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
501 sizeof(struct tag));
502 cfi->fileVersionNum = cpu_to_le16(1);
503 cfi->lengthFileIdent = namelen;
504 cfi->lengthOfImpUse = cpu_to_le16(0);
505 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
506 dir->i_size += nfidlen;
507 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
508 dinfo->i_lenAlloc += nfidlen;
509 else {
510 /* Find the last extent and truncate it to proper size */
511 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
512 (EXT_RECORDED_ALLOCATED >> 30))
513 ;
514 elen -= dinfo->i_lenExtents - dir->i_size;
515 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
516 epos.offset -= sizeof(struct short_ad);
517 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
518 epos.offset -= sizeof(struct long_ad);
519 udf_write_aext(dir, &epos, &eloc, elen, 1);
520 dinfo->i_lenExtents = dir->i_size;
521 }
522
523 mark_inode_dirty(dir);
524 goto out_ok;
525 } else {
526 *err = -EIO;
527 goto out_err;
528 }
529
530out_err:
531 fi = NULL;
532 if (fibh->sbh != fibh->ebh)
533 brelse(fibh->ebh);
534 brelse(fibh->sbh);
535out_ok:
536 brelse(epos.bh);
537 kfree(name);
538 return fi;
539}
540
541static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
542 struct udf_fileident_bh *fibh,
543 struct fileIdentDesc *cfi)
544{
545 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
546
547 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
548 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
549
550 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
551}
552
553static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
554 struct nameidata *nd)
555{
556 struct udf_fileident_bh fibh;
557 struct inode *inode;
558 struct fileIdentDesc cfi, *fi;
559 int err;
560 struct udf_inode_info *iinfo;
561
562 inode = udf_new_inode(dir, mode, &err);
563 if (!inode) {
564 return err;
565 }
566
567 iinfo = UDF_I(inode);
568 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
569 inode->i_data.a_ops = &udf_adinicb_aops;
570 else
571 inode->i_data.a_ops = &udf_aops;
572 inode->i_op = &udf_file_inode_operations;
573 inode->i_fop = &udf_file_operations;
574 mark_inode_dirty(inode);
575
576 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
577 if (!fi) {
578 inode_dec_link_count(inode);
579 iput(inode);
580 return err;
581 }
582 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
583 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
584 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
585 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
586 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
587 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
588 mark_inode_dirty(dir);
589 if (fibh.sbh != fibh.ebh)
590 brelse(fibh.ebh);
591 brelse(fibh.sbh);
592 d_instantiate(dentry, inode);
593
594 return 0;
595}
596
597static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
598 dev_t rdev)
599{
600 struct inode *inode;
601 struct udf_fileident_bh fibh;
602 struct fileIdentDesc cfi, *fi;
603 int err;
604 struct udf_inode_info *iinfo;
605
606 if (!old_valid_dev(rdev))
607 return -EINVAL;
608
609 err = -EIO;
610 inode = udf_new_inode(dir, mode, &err);
611 if (!inode)
612 goto out;
613
614 iinfo = UDF_I(inode);
615 init_special_inode(inode, mode, rdev);
616 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
617 if (!fi) {
618 inode_dec_link_count(inode);
619 iput(inode);
620 return err;
621 }
622 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
623 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
624 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
625 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
626 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
627 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
628 mark_inode_dirty(dir);
629 mark_inode_dirty(inode);
630
631 if (fibh.sbh != fibh.ebh)
632 brelse(fibh.ebh);
633 brelse(fibh.sbh);
634 d_instantiate(dentry, inode);
635 err = 0;
636
637out:
638 return err;
639}
640
641static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
642{
643 struct inode *inode;
644 struct udf_fileident_bh fibh;
645 struct fileIdentDesc cfi, *fi;
646 int err;
647 struct udf_inode_info *dinfo = UDF_I(dir);
648 struct udf_inode_info *iinfo;
649
650 err = -EIO;
651 inode = udf_new_inode(dir, S_IFDIR | mode, &err);
652 if (!inode)
653 goto out;
654
655 iinfo = UDF_I(inode);
656 inode->i_op = &udf_dir_inode_operations;
657 inode->i_fop = &udf_dir_operations;
658 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
659 if (!fi) {
660 inode_dec_link_count(inode);
661 iput(inode);
662 goto out;
663 }
664 set_nlink(inode, 2);
665 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
666 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
667 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
668 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
669 cfi.fileCharacteristics =
670 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
671 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
672 brelse(fibh.sbh);
673 mark_inode_dirty(inode);
674
675 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
676 if (!fi) {
677 clear_nlink(inode);
678 mark_inode_dirty(inode);
679 iput(inode);
680 goto out;
681 }
682 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
683 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
684 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
685 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
686 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
687 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
688 inc_nlink(dir);
689 mark_inode_dirty(dir);
690 d_instantiate(dentry, inode);
691 if (fibh.sbh != fibh.ebh)
692 brelse(fibh.ebh);
693 brelse(fibh.sbh);
694 err = 0;
695
696out:
697 return err;
698}
699
700static int empty_dir(struct inode *dir)
701{
702 struct fileIdentDesc *fi, cfi;
703 struct udf_fileident_bh fibh;
704 loff_t f_pos;
705 loff_t size = udf_ext0_offset(dir) + dir->i_size;
706 int block;
707 struct kernel_lb_addr eloc;
708 uint32_t elen;
709 sector_t offset;
710 struct extent_position epos = {};
711 struct udf_inode_info *dinfo = UDF_I(dir);
712
713 f_pos = udf_ext0_offset(dir);
714 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
715
716 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
717 fibh.sbh = fibh.ebh = NULL;
718 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
719 &epos, &eloc, &elen, &offset) ==
720 (EXT_RECORDED_ALLOCATED >> 30)) {
721 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
722 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
723 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
724 epos.offset -= sizeof(struct short_ad);
725 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
726 epos.offset -= sizeof(struct long_ad);
727 } else
728 offset = 0;
729
730 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
731 if (!fibh.sbh) {
732 brelse(epos.bh);
733 return 0;
734 }
735 } else {
736 brelse(epos.bh);
737 return 0;
738 }
739
740 while (f_pos < size) {
741 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
742 &elen, &offset);
743 if (!fi) {
744 if (fibh.sbh != fibh.ebh)
745 brelse(fibh.ebh);
746 brelse(fibh.sbh);
747 brelse(epos.bh);
748 return 0;
749 }
750
751 if (cfi.lengthFileIdent &&
752 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
753 if (fibh.sbh != fibh.ebh)
754 brelse(fibh.ebh);
755 brelse(fibh.sbh);
756 brelse(epos.bh);
757 return 0;
758 }
759 }
760
761 if (fibh.sbh != fibh.ebh)
762 brelse(fibh.ebh);
763 brelse(fibh.sbh);
764 brelse(epos.bh);
765
766 return 1;
767}
768
769static int udf_rmdir(struct inode *dir, struct dentry *dentry)
770{
771 int retval;
772 struct inode *inode = dentry->d_inode;
773 struct udf_fileident_bh fibh;
774 struct fileIdentDesc *fi, cfi;
775 struct kernel_lb_addr tloc;
776
777 retval = -ENOENT;
778 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
779 if (!fi)
780 goto out;
781
782 retval = -EIO;
783 tloc = lelb_to_cpu(cfi.icb.extLocation);
784 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
785 goto end_rmdir;
786 retval = -ENOTEMPTY;
787 if (!empty_dir(inode))
788 goto end_rmdir;
789 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
790 if (retval)
791 goto end_rmdir;
792 if (inode->i_nlink != 2)
793 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
794 inode->i_nlink);
795 clear_nlink(inode);
796 inode->i_size = 0;
797 inode_dec_link_count(dir);
798 inode->i_ctime = dir->i_ctime = dir->i_mtime =
799 current_fs_time(dir->i_sb);
800 mark_inode_dirty(dir);
801
802end_rmdir:
803 if (fibh.sbh != fibh.ebh)
804 brelse(fibh.ebh);
805 brelse(fibh.sbh);
806
807out:
808 return retval;
809}
810
811static int udf_unlink(struct inode *dir, struct dentry *dentry)
812{
813 int retval;
814 struct inode *inode = dentry->d_inode;
815 struct udf_fileident_bh fibh;
816 struct fileIdentDesc *fi;
817 struct fileIdentDesc cfi;
818 struct kernel_lb_addr tloc;
819
820 retval = -ENOENT;
821 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
822 if (!fi)
823 goto out;
824
825 retval = -EIO;
826 tloc = lelb_to_cpu(cfi.icb.extLocation);
827 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
828 goto end_unlink;
829
830 if (!inode->i_nlink) {
831 udf_debug("Deleting nonexistent file (%lu), %d\n",
832 inode->i_ino, inode->i_nlink);
833 set_nlink(inode, 1);
834 }
835 retval = udf_delete_entry(dir, fi, &fibh, &cfi);
836 if (retval)
837 goto end_unlink;
838 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
839 mark_inode_dirty(dir);
840 inode_dec_link_count(inode);
841 inode->i_ctime = dir->i_ctime;
842 retval = 0;
843
844end_unlink:
845 if (fibh.sbh != fibh.ebh)
846 brelse(fibh.ebh);
847 brelse(fibh.sbh);
848
849out:
850 return retval;
851}
852
853static int udf_symlink(struct inode *dir, struct dentry *dentry,
854 const char *symname)
855{
856 struct inode *inode;
857 struct pathComponent *pc;
858 const char *compstart;
859 struct udf_fileident_bh fibh;
860 struct extent_position epos = {};
861 int eoffset, elen = 0;
862 struct fileIdentDesc *fi;
863 struct fileIdentDesc cfi;
864 uint8_t *ea;
865 int err;
866 int block;
867 unsigned char *name = NULL;
868 int namelen;
869 struct udf_inode_info *iinfo;
870 struct super_block *sb = dir->i_sb;
871
872 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
873 if (!inode)
874 goto out;
875
876 iinfo = UDF_I(inode);
877 down_write(&iinfo->i_data_sem);
878 name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
879 if (!name) {
880 err = -ENOMEM;
881 goto out_no_entry;
882 }
883
884 inode->i_data.a_ops = &udf_symlink_aops;
885 inode->i_op = &udf_symlink_inode_operations;
886
887 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
888 struct kernel_lb_addr eloc;
889 uint32_t bsize;
890
891 block = udf_new_block(sb, inode,
892 iinfo->i_location.partitionReferenceNum,
893 iinfo->i_location.logicalBlockNum, &err);
894 if (!block)
895 goto out_no_entry;
896 epos.block = iinfo->i_location;
897 epos.offset = udf_file_entry_alloc_offset(inode);
898 epos.bh = NULL;
899 eloc.logicalBlockNum = block;
900 eloc.partitionReferenceNum =
901 iinfo->i_location.partitionReferenceNum;
902 bsize = sb->s_blocksize;
903 iinfo->i_lenExtents = bsize;
904 udf_add_aext(inode, &epos, &eloc, bsize, 0);
905 brelse(epos.bh);
906
907 block = udf_get_pblock(sb, block,
908 iinfo->i_location.partitionReferenceNum,
909 0);
910 epos.bh = udf_tgetblk(sb, block);
911 lock_buffer(epos.bh);
912 memset(epos.bh->b_data, 0x00, bsize);
913 set_buffer_uptodate(epos.bh);
914 unlock_buffer(epos.bh);
915 mark_buffer_dirty_inode(epos.bh, inode);
916 ea = epos.bh->b_data + udf_ext0_offset(inode);
917 } else
918 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
919
920 eoffset = sb->s_blocksize - udf_ext0_offset(inode);
921 pc = (struct pathComponent *)ea;
922
923 if (*symname == '/') {
924 do {
925 symname++;
926 } while (*symname == '/');
927
928 pc->componentType = 1;
929 pc->lengthComponentIdent = 0;
930 pc->componentFileVersionNum = 0;
931 elen += sizeof(struct pathComponent);
932 }
933
934 err = -ENAMETOOLONG;
935
936 while (*symname) {
937 if (elen + sizeof(struct pathComponent) > eoffset)
938 goto out_no_entry;
939
940 pc = (struct pathComponent *)(ea + elen);
941
942 compstart = symname;
943
944 do {
945 symname++;
946 } while (*symname && *symname != '/');
947
948 pc->componentType = 5;
949 pc->lengthComponentIdent = 0;
950 pc->componentFileVersionNum = 0;
951 if (compstart[0] == '.') {
952 if ((symname - compstart) == 1)
953 pc->componentType = 4;
954 else if ((symname - compstart) == 2 &&
955 compstart[1] == '.')
956 pc->componentType = 3;
957 }
958
959 if (pc->componentType == 5) {
960 namelen = udf_put_filename(sb, compstart, name,
961 symname - compstart);
962 if (!namelen)
963 goto out_no_entry;
964
965 if (elen + sizeof(struct pathComponent) + namelen >
966 eoffset)
967 goto out_no_entry;
968 else
969 pc->lengthComponentIdent = namelen;
970
971 memcpy(pc->componentIdent, name, namelen);
972 }
973
974 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
975
976 if (*symname) {
977 do {
978 symname++;
979 } while (*symname == '/');
980 }
981 }
982
983 brelse(epos.bh);
984 inode->i_size = elen;
985 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
986 iinfo->i_lenAlloc = inode->i_size;
987 else
988 udf_truncate_tail_extent(inode);
989 mark_inode_dirty(inode);
990
991 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
992 if (!fi)
993 goto out_no_entry;
994 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
995 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
996 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
997 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
998 cpu_to_le32(lvid_get_unique_id(sb));
999 }
1000 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1001 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1002 mark_inode_dirty(dir);
1003 up_write(&iinfo->i_data_sem);
1004 if (fibh.sbh != fibh.ebh)
1005 brelse(fibh.ebh);
1006 brelse(fibh.sbh);
1007 d_instantiate(dentry, inode);
1008 err = 0;
1009
1010out:
1011 kfree(name);
1012 return err;
1013
1014out_no_entry:
1015 up_write(&iinfo->i_data_sem);
1016 inode_dec_link_count(inode);
1017 iput(inode);
1018 goto out;
1019}
1020
1021static int udf_link(struct dentry *old_dentry, struct inode *dir,
1022 struct dentry *dentry)
1023{
1024 struct inode *inode = old_dentry->d_inode;
1025 struct udf_fileident_bh fibh;
1026 struct fileIdentDesc cfi, *fi;
1027 int err;
1028
1029 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1030 if (!fi) {
1031 return err;
1032 }
1033 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1034 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1035 if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1036 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1037 cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1038 }
1039 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1040 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1041 mark_inode_dirty(dir);
1042
1043 if (fibh.sbh != fibh.ebh)
1044 brelse(fibh.ebh);
1045 brelse(fibh.sbh);
1046 inc_nlink(inode);
1047 inode->i_ctime = current_fs_time(inode->i_sb);
1048 mark_inode_dirty(inode);
1049 ihold(inode);
1050 d_instantiate(dentry, inode);
1051
1052 return 0;
1053}
1054
1055/* Anybody can rename anything with this: the permission checks are left to the
1056 * higher-level routines.
1057 */
1058static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1059 struct inode *new_dir, struct dentry *new_dentry)
1060{
1061 struct inode *old_inode = old_dentry->d_inode;
1062 struct inode *new_inode = new_dentry->d_inode;
1063 struct udf_fileident_bh ofibh, nfibh;
1064 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1065 struct fileIdentDesc ocfi, ncfi;
1066 struct buffer_head *dir_bh = NULL;
1067 int retval = -ENOENT;
1068 struct kernel_lb_addr tloc;
1069 struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1070
1071 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1072 if (ofi) {
1073 if (ofibh.sbh != ofibh.ebh)
1074 brelse(ofibh.ebh);
1075 brelse(ofibh.sbh);
1076 }
1077 tloc = lelb_to_cpu(ocfi.icb.extLocation);
1078 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1079 != old_inode->i_ino)
1080 goto end_rename;
1081
1082 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1083 if (nfi) {
1084 if (!new_inode) {
1085 if (nfibh.sbh != nfibh.ebh)
1086 brelse(nfibh.ebh);
1087 brelse(nfibh.sbh);
1088 nfi = NULL;
1089 }
1090 }
1091 if (S_ISDIR(old_inode->i_mode)) {
1092 int offset = udf_ext0_offset(old_inode);
1093
1094 if (new_inode) {
1095 retval = -ENOTEMPTY;
1096 if (!empty_dir(new_inode))
1097 goto end_rename;
1098 }
1099 retval = -EIO;
1100 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1101 dir_fi = udf_get_fileident(
1102 old_iinfo->i_ext.i_data -
1103 (old_iinfo->i_efe ?
1104 sizeof(struct extendedFileEntry) :
1105 sizeof(struct fileEntry)),
1106 old_inode->i_sb->s_blocksize, &offset);
1107 } else {
1108 dir_bh = udf_bread(old_inode, 0, 0, &retval);
1109 if (!dir_bh)
1110 goto end_rename;
1111 dir_fi = udf_get_fileident(dir_bh->b_data,
1112 old_inode->i_sb->s_blocksize, &offset);
1113 }
1114 if (!dir_fi)
1115 goto end_rename;
1116 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1117 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1118 old_dir->i_ino)
1119 goto end_rename;
1120 }
1121 if (!nfi) {
1122 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1123 &retval);
1124 if (!nfi)
1125 goto end_rename;
1126 }
1127
1128 /*
1129 * Like most other Unix systems, set the ctime for inodes on a
1130 * rename.
1131 */
1132 old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1133 mark_inode_dirty(old_inode);
1134
1135 /*
1136 * ok, that's it
1137 */
1138 ncfi.fileVersionNum = ocfi.fileVersionNum;
1139 ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1140 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1141 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1142
1143 /* The old fid may have moved - find it again */
1144 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1145 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1146
1147 if (new_inode) {
1148 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1149 inode_dec_link_count(new_inode);
1150 }
1151 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1152 mark_inode_dirty(old_dir);
1153
1154 if (dir_fi) {
1155 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1156 udf_update_tag((char *)dir_fi,
1157 (sizeof(struct fileIdentDesc) +
1158 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1159 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1160 mark_inode_dirty(old_inode);
1161 else
1162 mark_buffer_dirty_inode(dir_bh, old_inode);
1163
1164 inode_dec_link_count(old_dir);
1165 if (new_inode)
1166 inode_dec_link_count(new_inode);
1167 else {
1168 inc_nlink(new_dir);
1169 mark_inode_dirty(new_dir);
1170 }
1171 }
1172
1173 if (ofi) {
1174 if (ofibh.sbh != ofibh.ebh)
1175 brelse(ofibh.ebh);
1176 brelse(ofibh.sbh);
1177 }
1178
1179 retval = 0;
1180
1181end_rename:
1182 brelse(dir_bh);
1183 if (nfi) {
1184 if (nfibh.sbh != nfibh.ebh)
1185 brelse(nfibh.ebh);
1186 brelse(nfibh.sbh);
1187 }
1188
1189 return retval;
1190}
1191
1192static struct dentry *udf_get_parent(struct dentry *child)
1193{
1194 struct kernel_lb_addr tloc;
1195 struct inode *inode = NULL;
1196 struct qstr dotdot = QSTR_INIT("..", 2);
1197 struct fileIdentDesc cfi;
1198 struct udf_fileident_bh fibh;
1199
1200 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1201 goto out_unlock;
1202
1203 if (fibh.sbh != fibh.ebh)
1204 brelse(fibh.ebh);
1205 brelse(fibh.sbh);
1206
1207 tloc = lelb_to_cpu(cfi.icb.extLocation);
1208 inode = udf_iget(child->d_inode->i_sb, &tloc);
1209 if (!inode)
1210 goto out_unlock;
1211
1212 return d_obtain_alias(inode);
1213out_unlock:
1214 return ERR_PTR(-EACCES);
1215}
1216
1217
1218static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1219 u16 partref, __u32 generation)
1220{
1221 struct inode *inode;
1222 struct kernel_lb_addr loc;
1223
1224 if (block == 0)
1225 return ERR_PTR(-ESTALE);
1226
1227 loc.logicalBlockNum = block;
1228 loc.partitionReferenceNum = partref;
1229 inode = udf_iget(sb, &loc);
1230
1231 if (inode == NULL)
1232 return ERR_PTR(-ENOMEM);
1233
1234 if (generation && inode->i_generation != generation) {
1235 iput(inode);
1236 return ERR_PTR(-ESTALE);
1237 }
1238 return d_obtain_alias(inode);
1239}
1240
1241static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1242 struct fid *fid, int fh_len, int fh_type)
1243{
1244 if ((fh_len != 3 && fh_len != 5) ||
1245 (fh_type != FILEID_UDF_WITH_PARENT &&
1246 fh_type != FILEID_UDF_WITHOUT_PARENT))
1247 return NULL;
1248
1249 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1250 fid->udf.generation);
1251}
1252
1253static struct dentry *udf_fh_to_parent(struct super_block *sb,
1254 struct fid *fid, int fh_len, int fh_type)
1255{
1256 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1257 return NULL;
1258
1259 return udf_nfs_get_inode(sb, fid->udf.parent_block,
1260 fid->udf.parent_partref,
1261 fid->udf.parent_generation);
1262}
1263static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1264 struct inode *parent)
1265{
1266 int len = *lenp;
1267 struct kernel_lb_addr location = UDF_I(inode)->i_location;
1268 struct fid *fid = (struct fid *)fh;
1269 int type = FILEID_UDF_WITHOUT_PARENT;
1270
1271 if (parent && (len < 5)) {
1272 *lenp = 5;
1273 return 255;
1274 } else if (len < 3) {
1275 *lenp = 3;
1276 return 255;
1277 }
1278
1279 *lenp = 3;
1280 fid->udf.block = location.logicalBlockNum;
1281 fid->udf.partref = location.partitionReferenceNum;
1282 fid->udf.generation = inode->i_generation;
1283
1284 if (parent) {
1285 location = UDF_I(parent)->i_location;
1286 fid->udf.parent_block = location.logicalBlockNum;
1287 fid->udf.parent_partref = location.partitionReferenceNum;
1288 fid->udf.parent_generation = inode->i_generation;
1289 *lenp = 5;
1290 type = FILEID_UDF_WITH_PARENT;
1291 }
1292
1293 return type;
1294}
1295
1296const struct export_operations udf_export_ops = {
1297 .encode_fh = udf_encode_fh,
1298 .fh_to_dentry = udf_fh_to_dentry,
1299 .fh_to_parent = udf_fh_to_parent,
1300 .get_parent = udf_get_parent,
1301};
1302
1303const struct inode_operations udf_dir_inode_operations = {
1304 .lookup = udf_lookup,
1305 .create = udf_create,
1306 .link = udf_link,
1307 .unlink = udf_unlink,
1308 .symlink = udf_symlink,
1309 .mkdir = udf_mkdir,
1310 .rmdir = udf_rmdir,
1311 .mknod = udf_mknod,
1312 .rename = udf_rename,
1313};
1314const struct inode_operations udf_symlink_inode_operations = {
1315 .readlink = generic_readlink,
1316 .follow_link = page_follow_link_light,
1317 .put_link = page_put_link,
1318};