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Merge tag 'mm-hotfixes-stable-2025-07-11-16-16' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-block.git] / fs / udf / namei.c
... / ...
CommitLineData
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 struct dentry *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 ERR_CAST(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_PTR(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_PTR(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 NULL;
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};
Linux 6.x block layer and io_uring tree(s)