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