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Merge tag 'iommu-updates-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-hirsute-kernel.git] / fs / exfat / namei.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/iversion.h>
7 #include <linux/namei.h>
8 #include <linux/slab.h>
9 #include <linux/buffer_head.h>
10 #include <linux/nls.h>
11
12 #include "exfat_raw.h"
13 #include "exfat_fs.h"
14
15 static inline unsigned long exfat_d_version(struct dentry *dentry)
16 {
17 return (unsigned long) dentry->d_fsdata;
18 }
19
20 static inline void exfat_d_version_set(struct dentry *dentry,
21 unsigned long version)
22 {
23 dentry->d_fsdata = (void *) version;
24 }
25
26 /*
27 * If new entry was created in the parent, it could create the 8.3 alias (the
28 * shortname of logname). So, the parent may have the negative-dentry which
29 * matches the created 8.3 alias.
30 *
31 * If it happened, the negative dentry isn't actually negative anymore. So,
32 * drop it.
33 */
34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
35 {
36 int ret;
37
38 if (flags & LOOKUP_RCU)
39 return -ECHILD;
40
41 /*
42 * This is not negative dentry. Always valid.
43 *
44 * Note, rename() to existing directory entry will have ->d_inode, and
45 * will use existing name which isn't specified name by user.
46 *
47 * We may be able to drop this positive dentry here. But dropping
48 * positive dentry isn't good idea. So it's unsupported like
49 * rename("filename", "FILENAME") for now.
50 */
51 if (d_really_is_positive(dentry))
52 return 1;
53
54 /*
55 * Drop the negative dentry, in order to make sure to use the case
56 * sensitive name which is specified by user if this is for creation.
57 */
58 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
59 return 0;
60
61 spin_lock(&dentry->d_lock);
62 ret = inode_eq_iversion(d_inode(dentry->d_parent),
63 exfat_d_version(dentry));
64 spin_unlock(&dentry->d_lock);
65 return ret;
66 }
67
68 /* returns the length of a struct qstr, ignoring trailing dots */
69 static unsigned int exfat_striptail_len(unsigned int len, const char *name)
70 {
71 while (len && name[len - 1] == '.')
72 len--;
73 return len;
74 }
75
76 /*
77 * Compute the hash for the exfat name corresponding to the dentry. If the name
78 * is invalid, we leave the hash code unchanged so that the existing dentry can
79 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
80 */
81 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
82 {
83 struct super_block *sb = dentry->d_sb;
84 struct nls_table *t = EXFAT_SB(sb)->nls_io;
85 const unsigned char *name = qstr->name;
86 unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
87 unsigned long hash = init_name_hash(dentry);
88 int i, charlen;
89 wchar_t c;
90
91 for (i = 0; i < len; i += charlen) {
92 charlen = t->char2uni(&name[i], len - i, &c);
93 if (charlen < 0)
94 return charlen;
95 hash = partial_name_hash(exfat_toupper(sb, c), hash);
96 }
97
98 qstr->hash = end_name_hash(hash);
99 return 0;
100 }
101
102 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
103 const char *str, const struct qstr *name)
104 {
105 struct super_block *sb = dentry->d_sb;
106 struct nls_table *t = EXFAT_SB(sb)->nls_io;
107 unsigned int alen = exfat_striptail_len(name->len, name->name);
108 unsigned int blen = exfat_striptail_len(len, str);
109 wchar_t c1, c2;
110 int charlen, i;
111
112 if (alen != blen)
113 return 1;
114
115 for (i = 0; i < len; i += charlen) {
116 charlen = t->char2uni(&name->name[i], alen - i, &c1);
117 if (charlen < 0)
118 return 1;
119 if (charlen != t->char2uni(&str[i], blen - i, &c2))
120 return 1;
121
122 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
123 return 1;
124 }
125
126 return 0;
127 }
128
129 const struct dentry_operations exfat_dentry_ops = {
130 .d_revalidate = exfat_d_revalidate,
131 .d_hash = exfat_d_hash,
132 .d_compare = exfat_d_cmp,
133 };
134
135 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
136 {
137 struct super_block *sb = dentry->d_sb;
138 const unsigned char *name = qstr->name;
139 unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
140 unsigned long hash = init_name_hash(dentry);
141 int i, charlen;
142 unicode_t u;
143
144 for (i = 0; i < len; i += charlen) {
145 charlen = utf8_to_utf32(&name[i], len - i, &u);
146 if (charlen < 0)
147 return charlen;
148
149 /*
150 * exfat_toupper() works only for code points up to the U+FFFF.
151 */
152 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
153 hash);
154 }
155
156 qstr->hash = end_name_hash(hash);
157 return 0;
158 }
159
160 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
161 const char *str, const struct qstr *name)
162 {
163 struct super_block *sb = dentry->d_sb;
164 unsigned int alen = exfat_striptail_len(name->len, name->name);
165 unsigned int blen = exfat_striptail_len(len, str);
166 unicode_t u_a, u_b;
167 int charlen, i;
168
169 if (alen != blen)
170 return 1;
171
172 for (i = 0; i < alen; i += charlen) {
173 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
174 if (charlen < 0)
175 return 1;
176 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
177 return 1;
178
179 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
180 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
181 return 1;
182 } else {
183 if (u_a != u_b)
184 return 1;
185 }
186 }
187
188 return 0;
189 }
190
191 const struct dentry_operations exfat_utf8_dentry_ops = {
192 .d_revalidate = exfat_d_revalidate,
193 .d_hash = exfat_utf8_d_hash,
194 .d_compare = exfat_utf8_d_cmp,
195 };
196
197 /* used only in search empty_slot() */
198 #define CNT_UNUSED_NOHIT (-1)
199 #define CNT_UNUSED_HIT (-2)
200 /* search EMPTY CONTINUOUS "num_entries" entries */
201 static int exfat_search_empty_slot(struct super_block *sb,
202 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
203 int num_entries)
204 {
205 int i, dentry, num_empty = 0;
206 int dentries_per_clu;
207 unsigned int type;
208 struct exfat_chain clu;
209 struct exfat_dentry *ep;
210 struct exfat_sb_info *sbi = EXFAT_SB(sb);
211 struct buffer_head *bh;
212
213 dentries_per_clu = sbi->dentries_per_clu;
214
215 if (hint_femp->eidx != EXFAT_HINT_NONE) {
216 dentry = hint_femp->eidx;
217 if (num_entries <= hint_femp->count) {
218 hint_femp->eidx = EXFAT_HINT_NONE;
219 return dentry;
220 }
221
222 exfat_chain_dup(&clu, &hint_femp->cur);
223 } else {
224 exfat_chain_dup(&clu, p_dir);
225 dentry = 0;
226 }
227
228 while (clu.dir != EXFAT_EOF_CLUSTER) {
229 i = dentry & (dentries_per_clu - 1);
230
231 for (; i < dentries_per_clu; i++, dentry++) {
232 ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
233 if (!ep)
234 return -EIO;
235 type = exfat_get_entry_type(ep);
236 brelse(bh);
237
238 if (type == TYPE_UNUSED || type == TYPE_DELETED) {
239 num_empty++;
240 if (hint_femp->eidx == EXFAT_HINT_NONE) {
241 hint_femp->eidx = dentry;
242 hint_femp->count = CNT_UNUSED_NOHIT;
243 exfat_chain_set(&hint_femp->cur,
244 clu.dir, clu.size, clu.flags);
245 }
246
247 if (type == TYPE_UNUSED &&
248 hint_femp->count != CNT_UNUSED_HIT)
249 hint_femp->count = CNT_UNUSED_HIT;
250 } else {
251 if (hint_femp->eidx != EXFAT_HINT_NONE &&
252 hint_femp->count == CNT_UNUSED_HIT) {
253 /* unused empty group means
254 * an empty group which includes
255 * unused dentry
256 */
257 exfat_fs_error(sb,
258 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
259 dentry, hint_femp->eidx,
260 p_dir->dir, clu.dir);
261 return -EIO;
262 }
263
264 num_empty = 0;
265 hint_femp->eidx = EXFAT_HINT_NONE;
266 }
267
268 if (num_empty >= num_entries) {
269 /* found and invalidate hint_femp */
270 hint_femp->eidx = EXFAT_HINT_NONE;
271 return (dentry - (num_entries - 1));
272 }
273 }
274
275 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
276 if (--clu.size > 0)
277 clu.dir++;
278 else
279 clu.dir = EXFAT_EOF_CLUSTER;
280 } else {
281 if (exfat_get_next_cluster(sb, &clu.dir))
282 return -EIO;
283 }
284 }
285
286 return -ENOSPC;
287 }
288
289 static int exfat_check_max_dentries(struct inode *inode)
290 {
291 if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
292 /*
293 * exFAT spec allows a dir to grow upto 8388608(256MB)
294 * dentries
295 */
296 return -ENOSPC;
297 }
298 return 0;
299 }
300
301 /* find empty directory entry.
302 * if there isn't any empty slot, expand cluster chain.
303 */
304 static int exfat_find_empty_entry(struct inode *inode,
305 struct exfat_chain *p_dir, int num_entries)
306 {
307 int dentry;
308 unsigned int ret, last_clu;
309 sector_t sector;
310 loff_t size = 0;
311 struct exfat_chain clu;
312 struct exfat_dentry *ep = NULL;
313 struct super_block *sb = inode->i_sb;
314 struct exfat_sb_info *sbi = EXFAT_SB(sb);
315 struct exfat_inode_info *ei = EXFAT_I(inode);
316 struct exfat_hint_femp hint_femp;
317
318 hint_femp.eidx = EXFAT_HINT_NONE;
319
320 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
321 memcpy(&hint_femp, &ei->hint_femp,
322 sizeof(struct exfat_hint_femp));
323 ei->hint_femp.eidx = EXFAT_HINT_NONE;
324 }
325
326 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
327 num_entries)) < 0) {
328 if (dentry == -EIO)
329 break;
330
331 if (exfat_check_max_dentries(inode))
332 return -ENOSPC;
333
334 /* we trust p_dir->size regardless of FAT type */
335 if (exfat_find_last_cluster(sb, p_dir, &last_clu))
336 return -EIO;
337
338 /*
339 * Allocate new cluster to this directory
340 */
341 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
342
343 /* allocate a cluster */
344 ret = exfat_alloc_cluster(inode, 1, &clu);
345 if (ret)
346 return ret;
347
348 if (exfat_zeroed_cluster(inode, clu.dir))
349 return -EIO;
350
351 /* append to the FAT chain */
352 if (clu.flags != p_dir->flags) {
353 /* no-fat-chain bit is disabled,
354 * so fat-chain should be synced with alloc-bitmap
355 */
356 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
357 p_dir->flags = ALLOC_FAT_CHAIN;
358 hint_femp.cur.flags = ALLOC_FAT_CHAIN;
359 }
360
361 if (clu.flags == ALLOC_FAT_CHAIN)
362 if (exfat_ent_set(sb, last_clu, clu.dir))
363 return -EIO;
364
365 if (hint_femp.eidx == EXFAT_HINT_NONE) {
366 /* the special case that new dentry
367 * should be allocated from the start of new cluster
368 */
369 hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
370 hint_femp.count = sbi->dentries_per_clu;
371
372 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
373 }
374 hint_femp.cur.size++;
375 p_dir->size++;
376 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
377
378 /* update the directory entry */
379 if (p_dir->dir != sbi->root_dir) {
380 struct buffer_head *bh;
381
382 ep = exfat_get_dentry(sb,
383 &(ei->dir), ei->entry + 1, &bh, &sector);
384 if (!ep)
385 return -EIO;
386
387 ep->dentry.stream.valid_size = cpu_to_le64(size);
388 ep->dentry.stream.size = ep->dentry.stream.valid_size;
389 ep->dentry.stream.flags = p_dir->flags;
390 exfat_update_bh(bh, IS_DIRSYNC(inode));
391 brelse(bh);
392 if (exfat_update_dir_chksum(inode, &(ei->dir),
393 ei->entry))
394 return -EIO;
395 }
396
397 /* directory inode should be updated in here */
398 i_size_write(inode, size);
399 EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
400 EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
401 EXFAT_I(inode)->flags = p_dir->flags;
402 inode->i_blocks += 1 << sbi->sect_per_clus_bits;
403 }
404
405 return dentry;
406 }
407
408 /*
409 * Name Resolution Functions :
410 * Zero if it was successful; otherwise nonzero.
411 */
412 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
413 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
414 int lookup)
415 {
416 int namelen;
417 int lossy = NLS_NAME_NO_LOSSY;
418 struct super_block *sb = inode->i_sb;
419 struct exfat_sb_info *sbi = EXFAT_SB(sb);
420 struct exfat_inode_info *ei = EXFAT_I(inode);
421
422 /* strip all trailing periods */
423 namelen = exfat_striptail_len(strlen(path), path);
424 if (!namelen)
425 return -ENOENT;
426
427 if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
428 return -ENAMETOOLONG;
429
430 /*
431 * strip all leading spaces :
432 * "MS windows 7" supports leading spaces.
433 * So we should skip this preprocessing for compatibility.
434 */
435
436 /* file name conversion :
437 * If lookup case, we allow bad-name for compatibility.
438 */
439 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
440 &lossy);
441 if (namelen < 0)
442 return namelen; /* return error value */
443
444 if ((lossy && !lookup) || !namelen)
445 return -EINVAL;
446
447 exfat_chain_set(p_dir, ei->start_clu,
448 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
449
450 return 0;
451 }
452
453 static inline int exfat_resolve_path(struct inode *inode,
454 const unsigned char *path, struct exfat_chain *dir,
455 struct exfat_uni_name *uni)
456 {
457 return __exfat_resolve_path(inode, path, dir, uni, 0);
458 }
459
460 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
461 const unsigned char *path, struct exfat_chain *dir,
462 struct exfat_uni_name *uni)
463 {
464 return __exfat_resolve_path(inode, path, dir, uni, 1);
465 }
466
467 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
468 {
469 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
470 }
471
472 static int exfat_add_entry(struct inode *inode, const char *path,
473 struct exfat_chain *p_dir, unsigned int type,
474 struct exfat_dir_entry *info)
475 {
476 int ret, dentry, num_entries;
477 struct super_block *sb = inode->i_sb;
478 struct exfat_sb_info *sbi = EXFAT_SB(sb);
479 struct exfat_uni_name uniname;
480 struct exfat_chain clu;
481 int clu_size = 0;
482 unsigned int start_clu = EXFAT_FREE_CLUSTER;
483
484 ret = exfat_resolve_path(inode, path, p_dir, &uniname);
485 if (ret)
486 goto out;
487
488 num_entries = exfat_calc_num_entries(&uniname);
489 if (num_entries < 0) {
490 ret = num_entries;
491 goto out;
492 }
493
494 /* exfat_find_empty_entry must be called before alloc_cluster() */
495 dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
496 if (dentry < 0) {
497 ret = dentry; /* -EIO or -ENOSPC */
498 goto out;
499 }
500
501 if (type == TYPE_DIR) {
502 ret = exfat_alloc_new_dir(inode, &clu);
503 if (ret)
504 goto out;
505 start_clu = clu.dir;
506 clu_size = sbi->cluster_size;
507 }
508
509 /* update the directory entry */
510 /* fill the dos name directory entry information of the created file.
511 * the first cluster is not determined yet. (0)
512 */
513 ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
514 start_clu, clu_size);
515 if (ret)
516 goto out;
517
518 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
519 if (ret)
520 goto out;
521
522 memcpy(&info->dir, p_dir, sizeof(struct exfat_chain));
523 info->entry = dentry;
524 info->flags = ALLOC_NO_FAT_CHAIN;
525 info->type = type;
526
527 if (type == TYPE_FILE) {
528 info->attr = ATTR_ARCHIVE;
529 info->start_clu = EXFAT_EOF_CLUSTER;
530 info->size = 0;
531 info->num_subdirs = 0;
532 } else {
533 int count;
534 struct exfat_chain cdir;
535
536 info->attr = ATTR_SUBDIR;
537 info->start_clu = start_clu;
538 info->size = clu_size;
539
540 exfat_chain_set(&cdir, info->start_clu,
541 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
542 count = exfat_count_dir_entries(sb, &cdir);
543 if (count < 0)
544 return -EIO;
545 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
546 }
547 memset(&info->crtime, 0, sizeof(info->crtime));
548 memset(&info->mtime, 0, sizeof(info->mtime));
549 memset(&info->atime, 0, sizeof(info->atime));
550 out:
551 return ret;
552 }
553
554 static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
555 bool excl)
556 {
557 struct super_block *sb = dir->i_sb;
558 struct inode *inode;
559 struct exfat_chain cdir;
560 struct exfat_dir_entry info;
561 loff_t i_pos;
562 int err;
563
564 mutex_lock(&EXFAT_SB(sb)->s_lock);
565 exfat_set_volume_dirty(sb);
566 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
567 &info);
568 exfat_clear_volume_dirty(sb);
569 if (err)
570 goto unlock;
571
572 inode_inc_iversion(dir);
573 dir->i_ctime = dir->i_mtime = current_time(dir);
574 if (IS_DIRSYNC(dir))
575 exfat_sync_inode(dir);
576 else
577 mark_inode_dirty(dir);
578
579 i_pos = exfat_make_i_pos(&info);
580 inode = exfat_build_inode(sb, &info, i_pos);
581 err = PTR_ERR_OR_ZERO(inode);
582 if (err)
583 goto unlock;
584
585 inode_inc_iversion(inode);
586 inode->i_mtime = inode->i_atime = inode->i_ctime =
587 EXFAT_I(inode)->i_crtime = current_time(inode);
588 exfat_truncate_atime(&inode->i_atime);
589 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
590
591 d_instantiate(dentry, inode);
592 unlock:
593 mutex_unlock(&EXFAT_SB(sb)->s_lock);
594 return err;
595 }
596
597 /* lookup a file */
598 static int exfat_find(struct inode *dir, struct qstr *qname,
599 struct exfat_dir_entry *info)
600 {
601 int ret, dentry, num_entries, count;
602 struct exfat_chain cdir;
603 struct exfat_uni_name uni_name;
604 struct super_block *sb = dir->i_sb;
605 struct exfat_sb_info *sbi = EXFAT_SB(sb);
606 struct exfat_inode_info *ei = EXFAT_I(dir);
607
608 if (qname->len == 0)
609 return -ENOENT;
610
611 /* check the validity of directory name in the given pathname */
612 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
613 if (ret)
614 return ret;
615
616 num_entries = exfat_calc_num_entries(&uni_name);
617 if (num_entries < 0)
618 return num_entries;
619
620 /* check the validation of hint_stat and initialize it if required */
621 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
622 ei->hint_stat.clu = cdir.dir;
623 ei->hint_stat.eidx = 0;
624 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
625 ei->hint_femp.eidx = EXFAT_HINT_NONE;
626 }
627
628 /* search the file name for directories */
629 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
630 num_entries, TYPE_ALL);
631
632 if ((dentry < 0) && (dentry != -EEXIST))
633 return dentry; /* -error value */
634
635 memcpy(&info->dir, &cdir.dir, sizeof(struct exfat_chain));
636 info->entry = dentry;
637 info->num_subdirs = 0;
638
639 /* root directory itself */
640 if (unlikely(dentry == -EEXIST)) {
641 int num_clu = 0;
642
643 info->type = TYPE_DIR;
644 info->attr = ATTR_SUBDIR;
645 info->flags = ALLOC_FAT_CHAIN;
646 info->start_clu = sbi->root_dir;
647 memset(&info->crtime, 0, sizeof(info->crtime));
648 memset(&info->mtime, 0, sizeof(info->mtime));
649 memset(&info->atime, 0, sizeof(info->atime));
650
651 exfat_chain_set(&cdir, sbi->root_dir, 0, ALLOC_FAT_CHAIN);
652 if (exfat_count_num_clusters(sb, &cdir, &num_clu))
653 return -EIO;
654 info->size = num_clu << sbi->cluster_size_bits;
655
656 count = exfat_count_dir_entries(sb, &cdir);
657 if (count < 0)
658 return -EIO;
659
660 info->num_subdirs = count;
661 } else {
662 struct exfat_dentry *ep, *ep2;
663 struct exfat_entry_set_cache *es;
664
665 es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
666 if (!es)
667 return -EIO;
668 ep = exfat_get_dentry_cached(es, 0);
669 ep2 = exfat_get_dentry_cached(es, 1);
670
671 info->type = exfat_get_entry_type(ep);
672 info->attr = le16_to_cpu(ep->dentry.file.attr);
673 info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
674 if ((info->type == TYPE_FILE) && (info->size == 0)) {
675 info->flags = ALLOC_NO_FAT_CHAIN;
676 info->start_clu = EXFAT_EOF_CLUSTER;
677 } else {
678 info->flags = ep2->dentry.stream.flags;
679 info->start_clu =
680 le32_to_cpu(ep2->dentry.stream.start_clu);
681 }
682
683 if (ei->start_clu == EXFAT_FREE_CLUSTER) {
684 exfat_fs_error(sb,
685 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
686 i_size_read(dir), ei->dir.dir, ei->entry);
687 exfat_free_dentry_set(es, false);
688 return -EIO;
689 }
690
691 exfat_get_entry_time(sbi, &info->crtime,
692 ep->dentry.file.create_tz,
693 ep->dentry.file.create_time,
694 ep->dentry.file.create_date,
695 ep->dentry.file.create_time_cs);
696 exfat_get_entry_time(sbi, &info->mtime,
697 ep->dentry.file.modify_tz,
698 ep->dentry.file.modify_time,
699 ep->dentry.file.modify_date,
700 ep->dentry.file.modify_time_cs);
701 exfat_get_entry_time(sbi, &info->atime,
702 ep->dentry.file.access_tz,
703 ep->dentry.file.access_time,
704 ep->dentry.file.access_date,
705 0);
706 exfat_free_dentry_set(es, false);
707
708 if (info->type == TYPE_DIR) {
709 exfat_chain_set(&cdir, info->start_clu,
710 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
711 count = exfat_count_dir_entries(sb, &cdir);
712 if (count < 0)
713 return -EIO;
714
715 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
716 }
717 }
718 return 0;
719 }
720
721 static int exfat_d_anon_disconn(struct dentry *dentry)
722 {
723 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
724 }
725
726 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
727 unsigned int flags)
728 {
729 struct super_block *sb = dir->i_sb;
730 struct inode *inode;
731 struct dentry *alias;
732 struct exfat_dir_entry info;
733 int err;
734 loff_t i_pos;
735 mode_t i_mode;
736
737 mutex_lock(&EXFAT_SB(sb)->s_lock);
738 err = exfat_find(dir, &dentry->d_name, &info);
739 if (err) {
740 if (err == -ENOENT) {
741 inode = NULL;
742 goto out;
743 }
744 goto unlock;
745 }
746
747 i_pos = exfat_make_i_pos(&info);
748 inode = exfat_build_inode(sb, &info, i_pos);
749 err = PTR_ERR_OR_ZERO(inode);
750 if (err)
751 goto unlock;
752
753 i_mode = inode->i_mode;
754 alias = d_find_alias(inode);
755
756 /*
757 * Checking "alias->d_parent == dentry->d_parent" to make sure
758 * FS is not corrupted (especially double linked dir).
759 */
760 if (alias && alias->d_parent == dentry->d_parent &&
761 !exfat_d_anon_disconn(alias)) {
762
763 /*
764 * Unhashed alias is able to exist because of revalidate()
765 * called by lookup_fast. You can easily make this status
766 * by calling create and lookup concurrently
767 * In such case, we reuse an alias instead of new dentry
768 */
769 if (d_unhashed(alias)) {
770 WARN_ON(alias->d_name.hash_len !=
771 dentry->d_name.hash_len);
772 exfat_info(sb, "rehashed a dentry(%p) in read lookup",
773 alias);
774 d_drop(dentry);
775 d_rehash(alias);
776 } else if (!S_ISDIR(i_mode)) {
777 /*
778 * This inode has non anonymous-DCACHE_DISCONNECTED
779 * dentry. This means, the user did ->lookup() by an
780 * another name (longname vs 8.3 alias of it) in past.
781 *
782 * Switch to new one for reason of locality if possible.
783 */
784 d_move(alias, dentry);
785 }
786 iput(inode);
787 mutex_unlock(&EXFAT_SB(sb)->s_lock);
788 return alias;
789 }
790 dput(alias);
791 out:
792 mutex_unlock(&EXFAT_SB(sb)->s_lock);
793 if (!inode)
794 exfat_d_version_set(dentry, inode_query_iversion(dir));
795
796 return d_splice_alias(inode, dentry);
797 unlock:
798 mutex_unlock(&EXFAT_SB(sb)->s_lock);
799 return ERR_PTR(err);
800 }
801
802 /* remove an entry, BUT don't truncate */
803 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
804 {
805 struct exfat_chain cdir;
806 struct exfat_dentry *ep;
807 struct super_block *sb = dir->i_sb;
808 struct inode *inode = dentry->d_inode;
809 struct exfat_inode_info *ei = EXFAT_I(inode);
810 struct buffer_head *bh;
811 sector_t sector;
812 int num_entries, entry, err = 0;
813
814 mutex_lock(&EXFAT_SB(sb)->s_lock);
815 exfat_chain_dup(&cdir, &ei->dir);
816 entry = ei->entry;
817 if (ei->dir.dir == DIR_DELETED) {
818 exfat_err(sb, "abnormal access to deleted dentry");
819 err = -ENOENT;
820 goto unlock;
821 }
822
823 ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
824 if (!ep) {
825 err = -EIO;
826 goto unlock;
827 }
828 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
829 if (num_entries < 0) {
830 err = -EIO;
831 brelse(bh);
832 goto unlock;
833 }
834 num_entries++;
835 brelse(bh);
836
837 exfat_set_volume_dirty(sb);
838 /* update the directory entry */
839 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
840 err = -EIO;
841 goto unlock;
842 }
843
844 /* This doesn't modify ei */
845 ei->dir.dir = DIR_DELETED;
846 exfat_clear_volume_dirty(sb);
847
848 inode_inc_iversion(dir);
849 dir->i_mtime = dir->i_atime = current_time(dir);
850 exfat_truncate_atime(&dir->i_atime);
851 if (IS_DIRSYNC(dir))
852 exfat_sync_inode(dir);
853 else
854 mark_inode_dirty(dir);
855
856 clear_nlink(inode);
857 inode->i_mtime = inode->i_atime = current_time(inode);
858 exfat_truncate_atime(&inode->i_atime);
859 exfat_unhash_inode(inode);
860 exfat_d_version_set(dentry, inode_query_iversion(dir));
861 unlock:
862 mutex_unlock(&EXFAT_SB(sb)->s_lock);
863 return err;
864 }
865
866 static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
867 {
868 struct super_block *sb = dir->i_sb;
869 struct inode *inode;
870 struct exfat_dir_entry info;
871 struct exfat_chain cdir;
872 loff_t i_pos;
873 int err;
874
875 mutex_lock(&EXFAT_SB(sb)->s_lock);
876 exfat_set_volume_dirty(sb);
877 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
878 &info);
879 exfat_clear_volume_dirty(sb);
880 if (err)
881 goto unlock;
882
883 inode_inc_iversion(dir);
884 dir->i_ctime = dir->i_mtime = current_time(dir);
885 if (IS_DIRSYNC(dir))
886 exfat_sync_inode(dir);
887 else
888 mark_inode_dirty(dir);
889 inc_nlink(dir);
890
891 i_pos = exfat_make_i_pos(&info);
892 inode = exfat_build_inode(sb, &info, i_pos);
893 err = PTR_ERR_OR_ZERO(inode);
894 if (err)
895 goto unlock;
896
897 inode_inc_iversion(inode);
898 inode->i_mtime = inode->i_atime = inode->i_ctime =
899 EXFAT_I(inode)->i_crtime = current_time(inode);
900 exfat_truncate_atime(&inode->i_atime);
901 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
902
903 d_instantiate(dentry, inode);
904
905 unlock:
906 mutex_unlock(&EXFAT_SB(sb)->s_lock);
907 return err;
908 }
909
910 static int exfat_check_dir_empty(struct super_block *sb,
911 struct exfat_chain *p_dir)
912 {
913 int i, dentries_per_clu;
914 unsigned int type;
915 struct exfat_chain clu;
916 struct exfat_dentry *ep;
917 struct exfat_sb_info *sbi = EXFAT_SB(sb);
918 struct buffer_head *bh;
919
920 dentries_per_clu = sbi->dentries_per_clu;
921
922 exfat_chain_dup(&clu, p_dir);
923
924 while (clu.dir != EXFAT_EOF_CLUSTER) {
925 for (i = 0; i < dentries_per_clu; i++) {
926 ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
927 if (!ep)
928 return -EIO;
929 type = exfat_get_entry_type(ep);
930 brelse(bh);
931 if (type == TYPE_UNUSED)
932 return 0;
933
934 if (type != TYPE_FILE && type != TYPE_DIR)
935 continue;
936
937 return -ENOTEMPTY;
938 }
939
940 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
941 if (--clu.size > 0)
942 clu.dir++;
943 else
944 clu.dir = EXFAT_EOF_CLUSTER;
945 } else {
946 if (exfat_get_next_cluster(sb, &(clu.dir)))
947 return -EIO;
948 }
949 }
950
951 return 0;
952 }
953
954 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
955 {
956 struct inode *inode = dentry->d_inode;
957 struct exfat_dentry *ep;
958 struct exfat_chain cdir, clu_to_free;
959 struct super_block *sb = inode->i_sb;
960 struct exfat_sb_info *sbi = EXFAT_SB(sb);
961 struct exfat_inode_info *ei = EXFAT_I(inode);
962 struct buffer_head *bh;
963 sector_t sector;
964 int num_entries, entry, err;
965
966 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
967
968 exfat_chain_dup(&cdir, &ei->dir);
969 entry = ei->entry;
970
971 if (ei->dir.dir == DIR_DELETED) {
972 exfat_err(sb, "abnormal access to deleted dentry");
973 err = -ENOENT;
974 goto unlock;
975 }
976
977 exfat_chain_set(&clu_to_free, ei->start_clu,
978 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
979
980 err = exfat_check_dir_empty(sb, &clu_to_free);
981 if (err) {
982 if (err == -EIO)
983 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
984 err);
985 goto unlock;
986 }
987
988 ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
989 if (!ep) {
990 err = -EIO;
991 goto unlock;
992 }
993
994 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
995 if (num_entries < 0) {
996 err = -EIO;
997 brelse(bh);
998 goto unlock;
999 }
1000 num_entries++;
1001 brelse(bh);
1002
1003 exfat_set_volume_dirty(sb);
1004 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
1005 if (err) {
1006 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
1007 goto unlock;
1008 }
1009 ei->dir.dir = DIR_DELETED;
1010 exfat_clear_volume_dirty(sb);
1011
1012 inode_inc_iversion(dir);
1013 dir->i_mtime = dir->i_atime = current_time(dir);
1014 exfat_truncate_atime(&dir->i_atime);
1015 if (IS_DIRSYNC(dir))
1016 exfat_sync_inode(dir);
1017 else
1018 mark_inode_dirty(dir);
1019 drop_nlink(dir);
1020
1021 clear_nlink(inode);
1022 inode->i_mtime = inode->i_atime = current_time(inode);
1023 exfat_truncate_atime(&inode->i_atime);
1024 exfat_unhash_inode(inode);
1025 exfat_d_version_set(dentry, inode_query_iversion(dir));
1026 unlock:
1027 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
1028 return err;
1029 }
1030
1031 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
1032 int oldentry, struct exfat_uni_name *p_uniname,
1033 struct exfat_inode_info *ei)
1034 {
1035 int ret, num_old_entries, num_new_entries;
1036 sector_t sector_old, sector_new;
1037 struct exfat_dentry *epold, *epnew;
1038 struct super_block *sb = inode->i_sb;
1039 struct buffer_head *new_bh, *old_bh;
1040 int sync = IS_DIRSYNC(inode);
1041
1042 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, &sector_old);
1043 if (!epold)
1044 return -EIO;
1045
1046 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1047 if (num_old_entries < 0)
1048 return -EIO;
1049 num_old_entries++;
1050
1051 num_new_entries = exfat_calc_num_entries(p_uniname);
1052 if (num_new_entries < 0)
1053 return num_new_entries;
1054
1055 if (num_old_entries < num_new_entries) {
1056 int newentry;
1057
1058 newentry =
1059 exfat_find_empty_entry(inode, p_dir, num_new_entries);
1060 if (newentry < 0)
1061 return newentry; /* -EIO or -ENOSPC */
1062
1063 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh,
1064 &sector_new);
1065 if (!epnew)
1066 return -EIO;
1067
1068 memcpy(epnew, epold, DENTRY_SIZE);
1069 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1070 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1071 ei->attr |= ATTR_ARCHIVE;
1072 }
1073 exfat_update_bh(new_bh, sync);
1074 brelse(old_bh);
1075 brelse(new_bh);
1076
1077 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
1078 &sector_old);
1079 if (!epold)
1080 return -EIO;
1081 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
1082 &sector_new);
1083 if (!epnew) {
1084 brelse(old_bh);
1085 return -EIO;
1086 }
1087
1088 memcpy(epnew, epold, DENTRY_SIZE);
1089 exfat_update_bh(new_bh, sync);
1090 brelse(old_bh);
1091 brelse(new_bh);
1092
1093 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1094 num_new_entries, p_uniname);
1095 if (ret)
1096 return ret;
1097
1098 exfat_remove_entries(inode, p_dir, oldentry, 0,
1099 num_old_entries);
1100 ei->entry = newentry;
1101 } else {
1102 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1103 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1104 ei->attr |= ATTR_ARCHIVE;
1105 }
1106 exfat_update_bh(old_bh, sync);
1107 brelse(old_bh);
1108 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1109 num_new_entries, p_uniname);
1110 if (ret)
1111 return ret;
1112
1113 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1114 num_old_entries);
1115 }
1116 return 0;
1117 }
1118
1119 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1120 int oldentry, struct exfat_chain *p_newdir,
1121 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1122 {
1123 int ret, newentry, num_new_entries, num_old_entries;
1124 sector_t sector_mov, sector_new;
1125 struct exfat_dentry *epmov, *epnew;
1126 struct super_block *sb = inode->i_sb;
1127 struct buffer_head *mov_bh, *new_bh;
1128
1129 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, &sector_mov);
1130 if (!epmov)
1131 return -EIO;
1132
1133 /* check if the source and target directory is the same */
1134 if (exfat_get_entry_type(epmov) == TYPE_DIR &&
1135 le32_to_cpu(epmov->dentry.stream.start_clu) == p_newdir->dir)
1136 return -EINVAL;
1137
1138 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1139 epmov);
1140 if (num_old_entries < 0)
1141 return -EIO;
1142 num_old_entries++;
1143
1144 num_new_entries = exfat_calc_num_entries(p_uniname);
1145 if (num_new_entries < 0)
1146 return num_new_entries;
1147
1148 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1149 if (newentry < 0)
1150 return newentry; /* -EIO or -ENOSPC */
1151
1152 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, &sector_new);
1153 if (!epnew)
1154 return -EIO;
1155
1156 memcpy(epnew, epmov, DENTRY_SIZE);
1157 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1158 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1159 ei->attr |= ATTR_ARCHIVE;
1160 }
1161 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1162 brelse(mov_bh);
1163 brelse(new_bh);
1164
1165 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
1166 &sector_mov);
1167 if (!epmov)
1168 return -EIO;
1169 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
1170 &sector_new);
1171 if (!epnew) {
1172 brelse(mov_bh);
1173 return -EIO;
1174 }
1175
1176 memcpy(epnew, epmov, DENTRY_SIZE);
1177 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1178 brelse(mov_bh);
1179 brelse(new_bh);
1180
1181 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1182 p_uniname);
1183 if (ret)
1184 return ret;
1185
1186 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1187
1188 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1189 p_newdir->flags);
1190
1191 ei->entry = newentry;
1192 return 0;
1193 }
1194
1195 static void exfat_update_parent_info(struct exfat_inode_info *ei,
1196 struct inode *parent_inode)
1197 {
1198 struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
1199 struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
1200 loff_t parent_isize = i_size_read(parent_inode);
1201
1202 /*
1203 * the problem that struct exfat_inode_info caches wrong parent info.
1204 *
1205 * because of flag-mismatch of ei->dir,
1206 * there is abnormal traversing cluster chain.
1207 */
1208 if (unlikely(parent_ei->flags != ei->dir.flags ||
1209 parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
1210 parent_ei->start_clu != ei->dir.dir)) {
1211 exfat_chain_set(&ei->dir, parent_ei->start_clu,
1212 EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
1213 parent_ei->flags);
1214 }
1215 }
1216
1217 /* rename or move a old file into a new file */
1218 static int __exfat_rename(struct inode *old_parent_inode,
1219 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1220 struct dentry *new_dentry)
1221 {
1222 int ret;
1223 int dentry;
1224 struct exfat_chain olddir, newdir;
1225 struct exfat_chain *p_dir = NULL;
1226 struct exfat_uni_name uni_name;
1227 struct exfat_dentry *ep;
1228 struct super_block *sb = old_parent_inode->i_sb;
1229 struct exfat_sb_info *sbi = EXFAT_SB(sb);
1230 const unsigned char *new_path = new_dentry->d_name.name;
1231 struct inode *new_inode = new_dentry->d_inode;
1232 int num_entries;
1233 struct exfat_inode_info *new_ei = NULL;
1234 unsigned int new_entry_type = TYPE_UNUSED;
1235 int new_entry = 0;
1236 struct buffer_head *old_bh, *new_bh = NULL;
1237
1238 /* check the validity of pointer parameters */
1239 if (new_path == NULL || strlen(new_path) == 0)
1240 return -EINVAL;
1241
1242 if (ei->dir.dir == DIR_DELETED) {
1243 exfat_err(sb, "abnormal access to deleted source dentry");
1244 return -ENOENT;
1245 }
1246
1247 exfat_update_parent_info(ei, old_parent_inode);
1248
1249 exfat_chain_dup(&olddir, &ei->dir);
1250 dentry = ei->entry;
1251
1252 ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
1253 if (!ep) {
1254 ret = -EIO;
1255 goto out;
1256 }
1257 brelse(old_bh);
1258
1259 /* check whether new dir is existing directory and empty */
1260 if (new_inode) {
1261 ret = -EIO;
1262 new_ei = EXFAT_I(new_inode);
1263
1264 if (new_ei->dir.dir == DIR_DELETED) {
1265 exfat_err(sb, "abnormal access to deleted target dentry");
1266 goto out;
1267 }
1268
1269 exfat_update_parent_info(new_ei, new_parent_inode);
1270
1271 p_dir = &(new_ei->dir);
1272 new_entry = new_ei->entry;
1273 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1274 if (!ep)
1275 goto out;
1276
1277 new_entry_type = exfat_get_entry_type(ep);
1278 brelse(new_bh);
1279
1280 /* if new_inode exists, update ei */
1281 if (new_entry_type == TYPE_DIR) {
1282 struct exfat_chain new_clu;
1283
1284 new_clu.dir = new_ei->start_clu;
1285 new_clu.size =
1286 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1287 sbi);
1288 new_clu.flags = new_ei->flags;
1289
1290 ret = exfat_check_dir_empty(sb, &new_clu);
1291 if (ret)
1292 goto out;
1293 }
1294 }
1295
1296 /* check the validity of directory name in the given new pathname */
1297 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1298 &uni_name);
1299 if (ret)
1300 goto out;
1301
1302 exfat_set_volume_dirty(sb);
1303
1304 if (olddir.dir == newdir.dir)
1305 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1306 &uni_name, ei);
1307 else
1308 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1309 &newdir, &uni_name, ei);
1310
1311 if (!ret && new_inode) {
1312 /* delete entries of new_dir */
1313 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1314 if (!ep) {
1315 ret = -EIO;
1316 goto del_out;
1317 }
1318
1319 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1320 if (num_entries < 0) {
1321 ret = -EIO;
1322 goto del_out;
1323 }
1324 brelse(new_bh);
1325
1326 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1327 num_entries + 1)) {
1328 ret = -EIO;
1329 goto del_out;
1330 }
1331
1332 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1333 if (new_entry_type == TYPE_DIR) {
1334 /* new_ei, new_clu_to_free */
1335 struct exfat_chain new_clu_to_free;
1336
1337 exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1338 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1339 sbi), new_ei->flags);
1340
1341 if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1342 /* just set I/O error only */
1343 ret = -EIO;
1344 }
1345
1346 i_size_write(new_inode, 0);
1347 new_ei->start_clu = EXFAT_EOF_CLUSTER;
1348 new_ei->flags = ALLOC_NO_FAT_CHAIN;
1349 }
1350 del_out:
1351 /* Update new_inode ei
1352 * Prevent syncing removed new_inode
1353 * (new_ei is already initialized above code ("if (new_inode)")
1354 */
1355 new_ei->dir.dir = DIR_DELETED;
1356 }
1357 exfat_clear_volume_dirty(sb);
1358 out:
1359 return ret;
1360 }
1361
1362 static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
1363 struct inode *new_dir, struct dentry *new_dentry,
1364 unsigned int flags)
1365 {
1366 struct inode *old_inode, *new_inode;
1367 struct super_block *sb = old_dir->i_sb;
1368 loff_t i_pos;
1369 int err;
1370
1371 /*
1372 * The VFS already checks for existence, so for local filesystems
1373 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1374 * Don't support any other flags
1375 */
1376 if (flags & ~RENAME_NOREPLACE)
1377 return -EINVAL;
1378
1379 mutex_lock(&EXFAT_SB(sb)->s_lock);
1380 old_inode = old_dentry->d_inode;
1381 new_inode = new_dentry->d_inode;
1382
1383 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1384 if (err)
1385 goto unlock;
1386
1387 inode_inc_iversion(new_dir);
1388 new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
1389 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1390 exfat_truncate_atime(&new_dir->i_atime);
1391 if (IS_DIRSYNC(new_dir))
1392 exfat_sync_inode(new_dir);
1393 else
1394 mark_inode_dirty(new_dir);
1395
1396 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1397 (EXFAT_I(old_inode)->entry & 0xffffffff);
1398 exfat_unhash_inode(old_inode);
1399 exfat_hash_inode(old_inode, i_pos);
1400 if (IS_DIRSYNC(new_dir))
1401 exfat_sync_inode(old_inode);
1402 else
1403 mark_inode_dirty(old_inode);
1404
1405 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1406 drop_nlink(old_dir);
1407 if (!new_inode)
1408 inc_nlink(new_dir);
1409 }
1410
1411 inode_inc_iversion(old_dir);
1412 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1413 if (IS_DIRSYNC(old_dir))
1414 exfat_sync_inode(old_dir);
1415 else
1416 mark_inode_dirty(old_dir);
1417
1418 if (new_inode) {
1419 exfat_unhash_inode(new_inode);
1420
1421 /* skip drop_nlink if new_inode already has been dropped */
1422 if (new_inode->i_nlink) {
1423 drop_nlink(new_inode);
1424 if (S_ISDIR(new_inode->i_mode))
1425 drop_nlink(new_inode);
1426 } else {
1427 exfat_warn(sb, "abnormal access to an inode dropped");
1428 WARN_ON(new_inode->i_nlink == 0);
1429 }
1430 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
1431 current_time(new_inode);
1432 }
1433
1434 unlock:
1435 mutex_unlock(&EXFAT_SB(sb)->s_lock);
1436 return err;
1437 }
1438
1439 const struct inode_operations exfat_dir_inode_operations = {
1440 .create = exfat_create,
1441 .lookup = exfat_lookup,
1442 .unlink = exfat_unlink,
1443 .mkdir = exfat_mkdir,
1444 .rmdir = exfat_rmdir,
1445 .rename = exfat_rename,
1446 .setattr = exfat_setattr,
1447 .getattr = exfat_getattr,
1448 };
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