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 }
381
382 /* append to the FAT chain */
383 if (clu.flags != p_dir->flags) {
384 /* no-fat-chain bit is disabled,
385 * so fat-chain should be synced with alloc-bitmap
386 */
387 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
388 p_dir->flags = ALLOC_FAT_CHAIN;
389 hint_femp.cur.flags = ALLOC_FAT_CHAIN;
390 }
391
392 if (clu.flags == ALLOC_FAT_CHAIN)
393 if (exfat_ent_set(sb, last_clu, clu.dir))
394 return -EIO;
395
396 if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER)
397 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
398
399 hint_femp.count += sbi->dentries_per_clu;
400
401 hint_femp.cur.size++;
402 p_dir->size++;
403 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
404
405 /* directory inode should be updated in here */
406 i_size_write(inode, size);
407 ei->i_size_ondisk += sbi->cluster_size;
408 ei->i_size_aligned += sbi->cluster_size;
409 ei->flags = p_dir->flags;
410 inode->i_blocks += sbi->cluster_size >> 9;
411 }
412
413 return dentry;
414 }
415
416 /*
417 * Name Resolution Functions :
418 * Zero if it was successful; otherwise nonzero.
419 */
__exfat_resolve_path(struct inode * inode,const unsigned char * path,struct exfat_chain * p_dir,struct exfat_uni_name * p_uniname,int lookup)420 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
421 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
422 int lookup)
423 {
424 int namelen;
425 int lossy = NLS_NAME_NO_LOSSY;
426 struct super_block *sb = inode->i_sb;
427 struct exfat_sb_info *sbi = EXFAT_SB(sb);
428 struct exfat_inode_info *ei = EXFAT_I(inode);
429 int pathlen = strlen(path);
430
431 /*
432 * get the length of the pathname excluding
433 * trailing periods, if any.
434 */
435 namelen = exfat_striptail_len(pathlen, path, false);
436 if (EXFAT_SB(sb)->options.keep_last_dots) {
437 /*
438 * Do not allow the creation of files with names
439 * ending with period(s).
440 */
441 if (!lookup && (namelen < pathlen))
442 return -EINVAL;
443 namelen = pathlen;
444 }
445 if (!namelen)
446 return -ENOENT;
447 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
448 return -ENAMETOOLONG;
449
450 /*
451 * strip all leading spaces :
452 * "MS windows 7" supports leading spaces.
453 * So we should skip this preprocessing for compatibility.
454 */
455
456 /* file name conversion :
457 * If lookup case, we allow bad-name for compatibility.
458 */
459 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
460 &lossy);
461 if (namelen < 0)
462 return namelen; /* return error value */
463
464 if ((lossy && !lookup) || !namelen)
465 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
466
467 exfat_chain_set(p_dir, ei->start_clu,
468 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
469
470 return 0;
471 }
472
exfat_resolve_path(struct inode * inode,const unsigned char * path,struct exfat_chain * dir,struct exfat_uni_name * uni)473 static inline int exfat_resolve_path(struct inode *inode,
474 const unsigned char *path, struct exfat_chain *dir,
475 struct exfat_uni_name *uni)
476 {
477 return __exfat_resolve_path(inode, path, dir, uni, 0);
478 }
479
exfat_resolve_path_for_lookup(struct inode * inode,const unsigned char * path,struct exfat_chain * dir,struct exfat_uni_name * uni)480 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
481 const unsigned char *path, struct exfat_chain *dir,
482 struct exfat_uni_name *uni)
483 {
484 return __exfat_resolve_path(inode, path, dir, uni, 1);
485 }
486
exfat_make_i_pos(struct exfat_dir_entry * info)487 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
488 {
489 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
490 }
491
exfat_add_entry(struct inode * inode,const char * path,struct exfat_chain * p_dir,unsigned int type,struct exfat_dir_entry * info)492 static int exfat_add_entry(struct inode *inode, const char *path,
493 struct exfat_chain *p_dir, unsigned int type,
494 struct exfat_dir_entry *info)
495 {
496 int ret, dentry, num_entries;
497 struct super_block *sb = inode->i_sb;
498 struct exfat_sb_info *sbi = EXFAT_SB(sb);
499 struct exfat_uni_name uniname;
500 struct exfat_chain clu;
501 int clu_size = 0;
502 unsigned int start_clu = EXFAT_FREE_CLUSTER;
503
504 ret = exfat_resolve_path(inode, path, p_dir, &uniname);
505 if (ret)
506 goto out;
507
508 num_entries = exfat_calc_num_entries(&uniname);
509 if (num_entries < 0) {
510 ret = num_entries;
511 goto out;
512 }
513
514 /* exfat_find_empty_entry must be called before alloc_cluster() */
515 dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
516 if (dentry < 0) {
517 ret = dentry; /* -EIO or -ENOSPC */
518 goto out;
519 }
520
521 if (type == TYPE_DIR) {
522 ret = exfat_alloc_new_dir(inode, &clu);
523 if (ret)
524 goto out;
525 start_clu = clu.dir;
526 clu_size = sbi->cluster_size;
527 }
528
529 /* update the directory entry */
530 /* fill the dos name directory entry information of the created file.
531 * the first cluster is not determined yet. (0)
532 */
533 ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
534 start_clu, clu_size);
535 if (ret)
536 goto out;
537
538 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
539 if (ret)
540 goto out;
541
542 info->dir = *p_dir;
543 info->entry = dentry;
544 info->flags = ALLOC_NO_FAT_CHAIN;
545 info->type = type;
546
547 if (type == TYPE_FILE) {
548 info->attr = ATTR_ARCHIVE;
549 info->start_clu = EXFAT_EOF_CLUSTER;
550 info->size = 0;
551 info->num_subdirs = 0;
552 } else {
553 info->attr = ATTR_SUBDIR;
554 info->start_clu = start_clu;
555 info->size = clu_size;
556 info->num_subdirs = EXFAT_MIN_SUBDIR;
557 }
558 memset(&info->crtime, 0, sizeof(info->crtime));
559 memset(&info->mtime, 0, sizeof(info->mtime));
560 memset(&info->atime, 0, sizeof(info->atime));
561 out:
562 return ret;
563 }
564
exfat_create(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)565 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir,
566 struct dentry *dentry, umode_t mode, bool excl)
567 {
568 struct super_block *sb = dir->i_sb;
569 struct inode *inode;
570 struct exfat_chain cdir;
571 struct exfat_dir_entry info;
572 loff_t i_pos;
573 int err;
574
575 mutex_lock(&EXFAT_SB(sb)->s_lock);
576 exfat_set_volume_dirty(sb);
577 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
578 &info);
579 if (err)
580 goto unlock;
581
582 inode_inc_iversion(dir);
583 dir->i_mtime = inode_set_ctime_current(dir);
584 if (IS_DIRSYNC(dir))
585 exfat_sync_inode(dir);
586 else
587 mark_inode_dirty(dir);
588
589 i_pos = exfat_make_i_pos(&info);
590 inode = exfat_build_inode(sb, &info, i_pos);
591 err = PTR_ERR_OR_ZERO(inode);
592 if (err)
593 goto unlock;
594
595 inode_inc_iversion(inode);
596 inode->i_mtime = inode->i_atime = EXFAT_I(inode)->i_crtime = inode_set_ctime_current(inode);
597 exfat_truncate_atime(&inode->i_atime);
598 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
599
600 d_instantiate(dentry, inode);
601 unlock:
602 mutex_unlock(&EXFAT_SB(sb)->s_lock);
603 return err;
604 }
605
606 /* lookup a file */
exfat_find(struct inode * dir,struct qstr * qname,struct exfat_dir_entry * info)607 static int exfat_find(struct inode *dir, struct qstr *qname,
608 struct exfat_dir_entry *info)
609 {
610 int ret, dentry, count;
611 struct exfat_chain cdir;
612 struct exfat_uni_name uni_name;
613 struct super_block *sb = dir->i_sb;
614 struct exfat_sb_info *sbi = EXFAT_SB(sb);
615 struct exfat_inode_info *ei = EXFAT_I(dir);
616 struct exfat_dentry *ep, *ep2;
617 struct exfat_entry_set_cache es;
618 /* for optimized dir & entry to prevent long traverse of cluster chain */
619 struct exfat_hint hint_opt;
620
621 if (qname->len == 0)
622 return -ENOENT;
623
624 /* check the validity of directory name in the given pathname */
625 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
626 if (ret)
627 return ret;
628
629 /* check the validation of hint_stat and initialize it if required */
630 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
631 ei->hint_stat.clu = cdir.dir;
632 ei->hint_stat.eidx = 0;
633 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
634 ei->hint_femp.eidx = EXFAT_HINT_NONE;
635 }
636
637 /* search the file name for directories */
638 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt);
639 if (dentry < 0)
640 return dentry; /* -error value */
641
642 info->dir = cdir;
643 info->entry = dentry;
644 info->num_subdirs = 0;
645
646 /* adjust cdir to the optimized value */
647 cdir.dir = hint_opt.clu;
648 if (cdir.flags & ALLOC_NO_FAT_CHAIN)
649 cdir.size -= dentry / sbi->dentries_per_clu;
650 dentry = hint_opt.eidx;
651 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES))
652 return -EIO;
653 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
654 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
655
656 info->type = exfat_get_entry_type(ep);
657 info->attr = le16_to_cpu(ep->dentry.file.attr);
658 info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
659 if (info->size == 0) {
660 info->flags = ALLOC_NO_FAT_CHAIN;
661 info->start_clu = EXFAT_EOF_CLUSTER;
662 } else {
663 info->flags = ep2->dentry.stream.flags;
664 info->start_clu =
665 le32_to_cpu(ep2->dentry.stream.start_clu);
666 }
667
668 exfat_get_entry_time(sbi, &info->crtime,
669 ep->dentry.file.create_tz,
670 ep->dentry.file.create_time,
671 ep->dentry.file.create_date,
672 ep->dentry.file.create_time_cs);
673 exfat_get_entry_time(sbi, &info->mtime,
674 ep->dentry.file.modify_tz,
675 ep->dentry.file.modify_time,
676 ep->dentry.file.modify_date,
677 ep->dentry.file.modify_time_cs);
678 exfat_get_entry_time(sbi, &info->atime,
679 ep->dentry.file.access_tz,
680 ep->dentry.file.access_time,
681 ep->dentry.file.access_date,
682 0);
683 exfat_put_dentry_set(&es, false);
684
685 if (ei->start_clu == EXFAT_FREE_CLUSTER) {
686 exfat_fs_error(sb,
687 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
688 i_size_read(dir), ei->dir.dir, ei->entry);
689 return -EIO;
690 }
691
692 if (info->type == TYPE_DIR) {
693 exfat_chain_set(&cdir, info->start_clu,
694 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
695 count = exfat_count_dir_entries(sb, &cdir);
696 if (count < 0)
697 return -EIO;
698
699 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
700 }
701 return 0;
702 }
703
exfat_d_anon_disconn(struct dentry * dentry)704 static int exfat_d_anon_disconn(struct dentry *dentry)
705 {
706 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
707 }
708
exfat_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)709 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
710 unsigned int flags)
711 {
712 struct super_block *sb = dir->i_sb;
713 struct inode *inode;
714 struct dentry *alias;
715 struct exfat_dir_entry info;
716 int err;
717 loff_t i_pos;
718 mode_t i_mode;
719
720 mutex_lock(&EXFAT_SB(sb)->s_lock);
721 err = exfat_find(dir, &dentry->d_name, &info);
722 if (err) {
723 if (err == -ENOENT) {
724 inode = NULL;
725 goto out;
726 }
727 goto unlock;
728 }
729
730 i_pos = exfat_make_i_pos(&info);
731 inode = exfat_build_inode(sb, &info, i_pos);
732 err = PTR_ERR_OR_ZERO(inode);
733 if (err)
734 goto unlock;
735
736 i_mode = inode->i_mode;
737 alias = d_find_alias(inode);
738
739 /*
740 * Checking "alias->d_parent == dentry->d_parent" to make sure
741 * FS is not corrupted (especially double linked dir).
742 */
743 if (alias && alias->d_parent == dentry->d_parent &&
744 !exfat_d_anon_disconn(alias)) {
745
746 /*
747 * Unhashed alias is able to exist because of revalidate()
748 * called by lookup_fast. You can easily make this status
749 * by calling create and lookup concurrently
750 * In such case, we reuse an alias instead of new dentry
751 */
752 if (d_unhashed(alias)) {
753 WARN_ON(alias->d_name.hash_len !=
754 dentry->d_name.hash_len);
755 exfat_info(sb, "rehashed a dentry(%p) in read lookup",
756 alias);
757 d_drop(dentry);
758 d_rehash(alias);
759 } else if (!S_ISDIR(i_mode)) {
760 /*
761 * This inode has non anonymous-DCACHE_DISCONNECTED
762 * dentry. This means, the user did ->lookup() by an
763 * another name (longname vs 8.3 alias of it) in past.
764 *
765 * Switch to new one for reason of locality if possible.
766 */
767 d_move(alias, dentry);
768 }
769 iput(inode);
770 mutex_unlock(&EXFAT_SB(sb)->s_lock);
771 return alias;
772 }
773 dput(alias);
774 out:
775 mutex_unlock(&EXFAT_SB(sb)->s_lock);
776 if (!inode)
777 exfat_d_version_set(dentry, inode_query_iversion(dir));
778
779 return d_splice_alias(inode, dentry);
780 unlock:
781 mutex_unlock(&EXFAT_SB(sb)->s_lock);
782 return ERR_PTR(err);
783 }
784
785 /* remove an entry, BUT don't truncate */
exfat_unlink(struct inode * dir,struct dentry * dentry)786 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
787 {
788 struct exfat_chain cdir;
789 struct exfat_dentry *ep;
790 struct super_block *sb = dir->i_sb;
791 struct inode *inode = dentry->d_inode;
792 struct exfat_inode_info *ei = EXFAT_I(inode);
793 struct buffer_head *bh;
794 int num_entries, entry, err = 0;
795
796 mutex_lock(&EXFAT_SB(sb)->s_lock);
797 exfat_chain_dup(&cdir, &ei->dir);
798 entry = ei->entry;
799 if (ei->dir.dir == DIR_DELETED) {
800 exfat_err(sb, "abnormal access to deleted dentry");
801 err = -ENOENT;
802 goto unlock;
803 }
804
805 ep = exfat_get_dentry(sb, &cdir, entry, &bh);
806 if (!ep) {
807 err = -EIO;
808 goto unlock;
809 }
810 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
811 if (num_entries < 0) {
812 err = -EIO;
813 brelse(bh);
814 goto unlock;
815 }
816 num_entries++;
817 brelse(bh);
818
819 exfat_set_volume_dirty(sb);
820 /* update the directory entry */
821 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
822 err = -EIO;
823 goto unlock;
824 }
825
826 /* This doesn't modify ei */
827 ei->dir.dir = DIR_DELETED;
828
829 inode_inc_iversion(dir);
830 dir->i_mtime = dir->i_atime = inode_set_ctime_current(dir);
831 exfat_truncate_atime(&dir->i_atime);
832 if (IS_DIRSYNC(dir))
833 exfat_sync_inode(dir);
834 else
835 mark_inode_dirty(dir);
836
837 clear_nlink(inode);
838 inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
839 exfat_truncate_atime(&inode->i_atime);
840 exfat_unhash_inode(inode);
841 exfat_d_version_set(dentry, inode_query_iversion(dir));
842 unlock:
843 mutex_unlock(&EXFAT_SB(sb)->s_lock);
844 return err;
845 }
846
exfat_mkdir(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)847 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
848 struct dentry *dentry, umode_t mode)
849 {
850 struct super_block *sb = dir->i_sb;
851 struct inode *inode;
852 struct exfat_dir_entry info;
853 struct exfat_chain cdir;
854 loff_t i_pos;
855 int err;
856
857 mutex_lock(&EXFAT_SB(sb)->s_lock);
858 exfat_set_volume_dirty(sb);
859 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
860 &info);
861 if (err)
862 goto unlock;
863
864 inode_inc_iversion(dir);
865 dir->i_mtime = inode_set_ctime_current(dir);
866 if (IS_DIRSYNC(dir))
867 exfat_sync_inode(dir);
868 else
869 mark_inode_dirty(dir);
870 inc_nlink(dir);
871
872 i_pos = exfat_make_i_pos(&info);
873 inode = exfat_build_inode(sb, &info, i_pos);
874 err = PTR_ERR_OR_ZERO(inode);
875 if (err)
876 goto unlock;
877
878 inode_inc_iversion(inode);
879 inode->i_mtime = inode->i_atime = EXFAT_I(inode)->i_crtime = inode_set_ctime_current(inode);
880 exfat_truncate_atime(&inode->i_atime);
881 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
882
883 d_instantiate(dentry, inode);
884
885 unlock:
886 mutex_unlock(&EXFAT_SB(sb)->s_lock);
887 return err;
888 }
889
exfat_check_dir_empty(struct super_block * sb,struct exfat_chain * p_dir)890 static int exfat_check_dir_empty(struct super_block *sb,
891 struct exfat_chain *p_dir)
892 {
893 int i, dentries_per_clu;
894 unsigned int type;
895 struct exfat_chain clu;
896 struct exfat_dentry *ep;
897 struct exfat_sb_info *sbi = EXFAT_SB(sb);
898 struct buffer_head *bh;
899
900 dentries_per_clu = sbi->dentries_per_clu;
901
902 if (p_dir->dir == EXFAT_EOF_CLUSTER)
903 return 0;
904
905 exfat_chain_dup(&clu, p_dir);
906
907 while (clu.dir != EXFAT_EOF_CLUSTER) {
908 for (i = 0; i < dentries_per_clu; i++) {
909 ep = exfat_get_dentry(sb, &clu, i, &bh);
910 if (!ep)
911 return -EIO;
912 type = exfat_get_entry_type(ep);
913 brelse(bh);
914 if (type == TYPE_UNUSED)
915 return 0;
916
917 if (type != TYPE_FILE && type != TYPE_DIR)
918 continue;
919
920 return -ENOTEMPTY;
921 }
922
923 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
924 if (--clu.size > 0)
925 clu.dir++;
926 else
927 clu.dir = EXFAT_EOF_CLUSTER;
928 } else {
929 if (exfat_get_next_cluster(sb, &(clu.dir)))
930 return -EIO;
931 }
932 }
933
934 return 0;
935 }
936
exfat_rmdir(struct inode * dir,struct dentry * dentry)937 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
938 {
939 struct inode *inode = dentry->d_inode;
940 struct exfat_dentry *ep;
941 struct exfat_chain cdir, clu_to_free;
942 struct super_block *sb = inode->i_sb;
943 struct exfat_sb_info *sbi = EXFAT_SB(sb);
944 struct exfat_inode_info *ei = EXFAT_I(inode);
945 struct buffer_head *bh;
946 int num_entries, entry, err;
947
948 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
949
950 exfat_chain_dup(&cdir, &ei->dir);
951 entry = ei->entry;
952
953 if (ei->dir.dir == DIR_DELETED) {
954 exfat_err(sb, "abnormal access to deleted dentry");
955 err = -ENOENT;
956 goto unlock;
957 }
958
959 exfat_chain_set(&clu_to_free, ei->start_clu,
960 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
961
962 err = exfat_check_dir_empty(sb, &clu_to_free);
963 if (err) {
964 if (err == -EIO)
965 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
966 err);
967 goto unlock;
968 }
969
970 ep = exfat_get_dentry(sb, &cdir, entry, &bh);
971 if (!ep) {
972 err = -EIO;
973 goto unlock;
974 }
975
976 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
977 if (num_entries < 0) {
978 err = -EIO;
979 brelse(bh);
980 goto unlock;
981 }
982 num_entries++;
983 brelse(bh);
984
985 exfat_set_volume_dirty(sb);
986 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
987 if (err) {
988 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
989 goto unlock;
990 }
991 ei->dir.dir = DIR_DELETED;
992
993 inode_inc_iversion(dir);
994 dir->i_mtime = dir->i_atime = inode_set_ctime_current(dir);
995 exfat_truncate_atime(&dir->i_atime);
996 if (IS_DIRSYNC(dir))
997 exfat_sync_inode(dir);
998 else
999 mark_inode_dirty(dir);
1000 drop_nlink(dir);
1001
1002 clear_nlink(inode);
1003 inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
1004 exfat_truncate_atime(&inode->i_atime);
1005 exfat_unhash_inode(inode);
1006 exfat_d_version_set(dentry, inode_query_iversion(dir));
1007 unlock:
1008 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
1009 return err;
1010 }
1011
exfat_rename_file(struct inode * inode,struct exfat_chain * p_dir,int oldentry,struct exfat_uni_name * p_uniname,struct exfat_inode_info * ei)1012 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
1013 int oldentry, struct exfat_uni_name *p_uniname,
1014 struct exfat_inode_info *ei)
1015 {
1016 int ret, num_old_entries, num_new_entries;
1017 struct exfat_dentry *epold, *epnew;
1018 struct super_block *sb = inode->i_sb;
1019 struct buffer_head *new_bh, *old_bh;
1020 int sync = IS_DIRSYNC(inode);
1021
1022 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh);
1023 if (!epold)
1024 return -EIO;
1025
1026 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1027 if (num_old_entries < 0)
1028 return -EIO;
1029 num_old_entries++;
1030
1031 num_new_entries = exfat_calc_num_entries(p_uniname);
1032 if (num_new_entries < 0)
1033 return num_new_entries;
1034
1035 if (num_old_entries < num_new_entries) {
1036 int newentry;
1037
1038 newentry =
1039 exfat_find_empty_entry(inode, p_dir, num_new_entries);
1040 if (newentry < 0)
1041 return newentry; /* -EIO or -ENOSPC */
1042
1043 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh);
1044 if (!epnew)
1045 return -EIO;
1046
1047 *epnew = *epold;
1048 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1049 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1050 ei->attr |= ATTR_ARCHIVE;
1051 }
1052 exfat_update_bh(new_bh, sync);
1053 brelse(old_bh);
1054 brelse(new_bh);
1055
1056 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh);
1057 if (!epold)
1058 return -EIO;
1059 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh);
1060 if (!epnew) {
1061 brelse(old_bh);
1062 return -EIO;
1063 }
1064
1065 *epnew = *epold;
1066 exfat_update_bh(new_bh, sync);
1067 brelse(old_bh);
1068 brelse(new_bh);
1069
1070 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1071 num_new_entries, p_uniname);
1072 if (ret)
1073 return ret;
1074
1075 exfat_remove_entries(inode, p_dir, oldentry, 0,
1076 num_old_entries);
1077 ei->dir = *p_dir;
1078 ei->entry = newentry;
1079 } else {
1080 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1081 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1082 ei->attr |= ATTR_ARCHIVE;
1083 }
1084 exfat_update_bh(old_bh, sync);
1085 brelse(old_bh);
1086 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1087 num_new_entries, p_uniname);
1088 if (ret)
1089 return ret;
1090
1091 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1092 num_old_entries);
1093 }
1094 return 0;
1095 }
1096
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)1097 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1098 int oldentry, struct exfat_chain *p_newdir,
1099 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1100 {
1101 int ret, newentry, num_new_entries, num_old_entries;
1102 struct exfat_dentry *epmov, *epnew;
1103 struct super_block *sb = inode->i_sb;
1104 struct buffer_head *mov_bh, *new_bh;
1105
1106 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh);
1107 if (!epmov)
1108 return -EIO;
1109
1110 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1111 epmov);
1112 if (num_old_entries < 0)
1113 return -EIO;
1114 num_old_entries++;
1115
1116 num_new_entries = exfat_calc_num_entries(p_uniname);
1117 if (num_new_entries < 0)
1118 return num_new_entries;
1119
1120 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1121 if (newentry < 0)
1122 return newentry; /* -EIO or -ENOSPC */
1123
1124 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh);
1125 if (!epnew)
1126 return -EIO;
1127
1128 *epnew = *epmov;
1129 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1130 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1131 ei->attr |= ATTR_ARCHIVE;
1132 }
1133 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1134 brelse(mov_bh);
1135 brelse(new_bh);
1136
1137 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh);
1138 if (!epmov)
1139 return -EIO;
1140 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh);
1141 if (!epnew) {
1142 brelse(mov_bh);
1143 return -EIO;
1144 }
1145
1146 *epnew = *epmov;
1147 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1148 brelse(mov_bh);
1149 brelse(new_bh);
1150
1151 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1152 p_uniname);
1153 if (ret)
1154 return ret;
1155
1156 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1157
1158 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1159 p_newdir->flags);
1160
1161 ei->entry = newentry;
1162 return 0;
1163 }
1164
1165 /* 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)1166 static int __exfat_rename(struct inode *old_parent_inode,
1167 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1168 struct dentry *new_dentry)
1169 {
1170 int ret;
1171 int dentry;
1172 struct exfat_chain olddir, newdir;
1173 struct exfat_chain *p_dir = NULL;
1174 struct exfat_uni_name uni_name;
1175 struct exfat_dentry *ep;
1176 struct super_block *sb = old_parent_inode->i_sb;
1177 struct exfat_sb_info *sbi = EXFAT_SB(sb);
1178 const unsigned char *new_path = new_dentry->d_name.name;
1179 struct inode *new_inode = new_dentry->d_inode;
1180 int num_entries;
1181 struct exfat_inode_info *new_ei = NULL;
1182 unsigned int new_entry_type = TYPE_UNUSED;
1183 int new_entry = 0;
1184 struct buffer_head *new_bh = NULL;
1185
1186 /* check the validity of pointer parameters */
1187 if (new_path == NULL || strlen(new_path) == 0)
1188 return -EINVAL;
1189
1190 if (ei->dir.dir == DIR_DELETED) {
1191 exfat_err(sb, "abnormal access to deleted source dentry");
1192 return -ENOENT;
1193 }
1194
1195 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu,
1196 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi),
1197 EXFAT_I(old_parent_inode)->flags);
1198 dentry = ei->entry;
1199
1200 /* check whether new dir is existing directory and empty */
1201 if (new_inode) {
1202 ret = -EIO;
1203 new_ei = EXFAT_I(new_inode);
1204
1205 if (new_ei->dir.dir == DIR_DELETED) {
1206 exfat_err(sb, "abnormal access to deleted target dentry");
1207 goto out;
1208 }
1209
1210 p_dir = &(new_ei->dir);
1211 new_entry = new_ei->entry;
1212 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1213 if (!ep)
1214 goto out;
1215
1216 new_entry_type = exfat_get_entry_type(ep);
1217 brelse(new_bh);
1218
1219 /* if new_inode exists, update ei */
1220 if (new_entry_type == TYPE_DIR) {
1221 struct exfat_chain new_clu;
1222
1223 new_clu.dir = new_ei->start_clu;
1224 new_clu.size =
1225 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1226 sbi);
1227 new_clu.flags = new_ei->flags;
1228
1229 ret = exfat_check_dir_empty(sb, &new_clu);
1230 if (ret)
1231 goto out;
1232 }
1233 }
1234
1235 /* check the validity of directory name in the given new pathname */
1236 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1237 &uni_name);
1238 if (ret)
1239 goto out;
1240
1241 exfat_set_volume_dirty(sb);
1242
1243 if (olddir.dir == newdir.dir)
1244 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1245 &uni_name, ei);
1246 else
1247 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1248 &newdir, &uni_name, ei);
1249
1250 if (!ret && new_inode) {
1251 /* delete entries of new_dir */
1252 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1253 if (!ep) {
1254 ret = -EIO;
1255 goto del_out;
1256 }
1257
1258 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1259 if (num_entries < 0) {
1260 ret = -EIO;
1261 goto del_out;
1262 }
1263 brelse(new_bh);
1264
1265 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1266 num_entries + 1)) {
1267 ret = -EIO;
1268 goto del_out;
1269 }
1270
1271 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1272 if (new_entry_type == TYPE_DIR &&
1273 new_ei->start_clu != EXFAT_EOF_CLUSTER) {
1274 /* new_ei, new_clu_to_free */
1275 struct exfat_chain new_clu_to_free;
1276
1277 exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1278 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1279 sbi), new_ei->flags);
1280
1281 if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1282 /* just set I/O error only */
1283 ret = -EIO;
1284 }
1285
1286 i_size_write(new_inode, 0);
1287 new_ei->start_clu = EXFAT_EOF_CLUSTER;
1288 new_ei->flags = ALLOC_NO_FAT_CHAIN;
1289 }
1290 del_out:
1291 /* Update new_inode ei
1292 * Prevent syncing removed new_inode
1293 * (new_ei is already initialized above code ("if (new_inode)")
1294 */
1295 new_ei->dir.dir = DIR_DELETED;
1296 }
1297 out:
1298 return ret;
1299 }
1300
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)1301 static int exfat_rename(struct mnt_idmap *idmap,
1302 struct inode *old_dir, struct dentry *old_dentry,
1303 struct inode *new_dir, struct dentry *new_dentry,
1304 unsigned int flags)
1305 {
1306 struct inode *old_inode, *new_inode;
1307 struct super_block *sb = old_dir->i_sb;
1308 loff_t i_pos;
1309 int err;
1310
1311 /*
1312 * The VFS already checks for existence, so for local filesystems
1313 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1314 * Don't support any other flags
1315 */
1316 if (flags & ~RENAME_NOREPLACE)
1317 return -EINVAL;
1318
1319 mutex_lock(&EXFAT_SB(sb)->s_lock);
1320 old_inode = old_dentry->d_inode;
1321 new_inode = new_dentry->d_inode;
1322
1323 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1324 if (err)
1325 goto unlock;
1326
1327 inode_inc_iversion(new_dir);
1328 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1329 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1330 exfat_truncate_atime(&new_dir->i_atime);
1331 if (IS_DIRSYNC(new_dir))
1332 exfat_sync_inode(new_dir);
1333 else
1334 mark_inode_dirty(new_dir);
1335
1336 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1337 (EXFAT_I(old_inode)->entry & 0xffffffff);
1338 exfat_unhash_inode(old_inode);
1339 exfat_hash_inode(old_inode, i_pos);
1340 if (IS_DIRSYNC(new_dir))
1341 exfat_sync_inode(old_inode);
1342 else
1343 mark_inode_dirty(old_inode);
1344
1345 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1346 drop_nlink(old_dir);
1347 if (!new_inode)
1348 inc_nlink(new_dir);
1349 }
1350
1351 inode_inc_iversion(old_dir);
1352 if (IS_DIRSYNC(old_dir))
1353 exfat_sync_inode(old_dir);
1354 else
1355 mark_inode_dirty(old_dir);
1356
1357 if (new_inode) {
1358 exfat_unhash_inode(new_inode);
1359
1360 /* skip drop_nlink if new_inode already has been dropped */
1361 if (new_inode->i_nlink) {
1362 drop_nlink(new_inode);
1363 if (S_ISDIR(new_inode->i_mode))
1364 drop_nlink(new_inode);
1365 } else {
1366 exfat_warn(sb, "abnormal access to an inode dropped");
1367 WARN_ON(new_inode->i_nlink == 0);
1368 }
1369 EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
1370 }
1371
1372 unlock:
1373 mutex_unlock(&EXFAT_SB(sb)->s_lock);
1374 return err;
1375 }
1376
1377 const struct inode_operations exfat_dir_inode_operations = {
1378 .create = exfat_create,
1379 .lookup = exfat_lookup,
1380 .unlink = exfat_unlink,
1381 .mkdir = exfat_mkdir,
1382 .rmdir = exfat_rmdir,
1383 .rename = exfat_rename,
1384 .setattr = exfat_setattr,
1385 .getattr = exfat_getattr,
1386 };
1387