1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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>
12 #include "exfat_raw.h"
15 static inline unsigned long exfat_d_version(struct dentry *dentry)
17 return (unsigned long) dentry->d_fsdata;
20 static inline void exfat_d_version_set(struct dentry *dentry,
21 unsigned long version)
23 dentry->d_fsdata = (void *) version;
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.
31 * If it happened, the negative dentry isn't actually negative anymore. So,
34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
38 if (flags & LOOKUP_RCU)
42 * This is not negative dentry. Always valid.
44 * Note, rename() to existing directory entry will have ->d_inode, and
45 * will use existing name which isn't specified name by user.
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.
51 if (d_really_is_positive(dentry))
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.
58 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
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);
68 /* returns the length of a struct qstr, ignoring trailing dots if necessary */
69 static unsigned int exfat_striptail_len(unsigned int len, const char *name,
72 if (!keep_last_dots) {
73 while (len && name[len - 1] == '.')
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.
84 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
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);
95 for (i = 0; i < len; i += charlen) {
96 charlen = t->char2uni(&name[i], len - i, &c);
99 hash = partial_name_hash(exfat_toupper(sb, c), hash);
102 qstr->hash = end_name_hash(hash);
106 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
107 const char *str, const struct qstr *name)
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);
121 for (i = 0; i < len; i += charlen) {
122 charlen = t->char2uni(&name->name[i], alen - i, &c1);
125 if (charlen != t->char2uni(&str[i], blen - i, &c2))
128 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
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,
141 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
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);
151 for (i = 0; i < len; i += charlen) {
152 charlen = utf8_to_utf32(&name[i], len - i, &u);
157 * exfat_toupper() works only for code points up to the U+FFFF.
159 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
163 qstr->hash = end_name_hash(hash);
167 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
168 const char *str, const struct qstr *name)
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);
182 for (i = 0; i < alen; i += charlen) {
183 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
186 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
189 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
190 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
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,
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 */
211 static int exfat_search_empty_slot(struct super_block *sb,
212 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
215 int i, dentry, num_empty = 0;
216 int dentries_per_clu;
218 struct exfat_chain clu;
219 struct exfat_dentry *ep;
220 struct exfat_sb_info *sbi = EXFAT_SB(sb);
221 struct buffer_head *bh;
223 dentries_per_clu = sbi->dentries_per_clu;
225 if (hint_femp->eidx != EXFAT_HINT_NONE) {
226 dentry = hint_femp->eidx;
227 if (num_entries <= hint_femp->count) {
228 hint_femp->eidx = EXFAT_HINT_NONE;
232 exfat_chain_dup(&clu, &hint_femp->cur);
234 exfat_chain_dup(&clu, p_dir);
238 while (clu.dir != EXFAT_EOF_CLUSTER) {
239 i = dentry & (dentries_per_clu - 1);
241 for (; i < dentries_per_clu; i++, dentry++) {
242 ep = exfat_get_dentry(sb, &clu, i, &bh);
245 type = exfat_get_entry_type(ep);
248 if (type == TYPE_UNUSED || type == TYPE_DELETED) {
250 if (hint_femp->eidx == EXFAT_HINT_NONE) {
251 hint_femp->eidx = dentry;
252 hint_femp->count = CNT_UNUSED_NOHIT;
253 exfat_chain_set(&hint_femp->cur,
254 clu.dir, clu.size, clu.flags);
257 if (type == TYPE_UNUSED &&
258 hint_femp->count != CNT_UNUSED_HIT)
259 hint_femp->count = CNT_UNUSED_HIT;
261 if (hint_femp->eidx != EXFAT_HINT_NONE &&
262 hint_femp->count == CNT_UNUSED_HIT) {
263 /* unused empty group means
264 * an empty group which includes
268 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
269 dentry, hint_femp->eidx,
270 p_dir->dir, clu.dir);
275 hint_femp->eidx = EXFAT_HINT_NONE;
278 if (num_empty >= num_entries) {
279 /* found and invalidate hint_femp */
280 hint_femp->eidx = EXFAT_HINT_NONE;
281 return (dentry - (num_entries - 1));
285 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
289 clu.dir = EXFAT_EOF_CLUSTER;
291 if (exfat_get_next_cluster(sb, &clu.dir))
299 static int exfat_check_max_dentries(struct inode *inode)
301 if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
303 * exFAT spec allows a dir to grow up to 8388608(256MB)
311 /* find empty directory entry.
312 * if there isn't any empty slot, expand cluster chain.
314 static int exfat_find_empty_entry(struct inode *inode,
315 struct exfat_chain *p_dir, int num_entries)
318 unsigned int ret, last_clu;
320 struct exfat_chain clu;
321 struct super_block *sb = inode->i_sb;
322 struct exfat_sb_info *sbi = EXFAT_SB(sb);
323 struct exfat_inode_info *ei = EXFAT_I(inode);
324 struct exfat_hint_femp hint_femp;
326 hint_femp.eidx = EXFAT_HINT_NONE;
328 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
329 hint_femp = ei->hint_femp;
330 ei->hint_femp.eidx = EXFAT_HINT_NONE;
333 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
338 if (exfat_check_max_dentries(inode))
341 /* we trust p_dir->size regardless of FAT type */
342 if (exfat_find_last_cluster(sb, p_dir, &last_clu))
346 * Allocate new cluster to this directory
348 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
350 /* allocate a cluster */
351 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
355 if (exfat_zeroed_cluster(inode, clu.dir))
358 /* append to the FAT chain */
359 if (clu.flags != p_dir->flags) {
360 /* no-fat-chain bit is disabled,
361 * so fat-chain should be synced with alloc-bitmap
363 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
364 p_dir->flags = ALLOC_FAT_CHAIN;
365 hint_femp.cur.flags = ALLOC_FAT_CHAIN;
368 if (clu.flags == ALLOC_FAT_CHAIN)
369 if (exfat_ent_set(sb, last_clu, clu.dir))
372 if (hint_femp.eidx == EXFAT_HINT_NONE) {
373 /* the special case that new dentry
374 * should be allocated from the start of new cluster
376 hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
377 hint_femp.count = sbi->dentries_per_clu;
379 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
381 hint_femp.cur.size++;
383 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
385 /* directory inode should be updated in here */
386 i_size_write(inode, size);
387 ei->i_size_ondisk += sbi->cluster_size;
388 ei->i_size_aligned += sbi->cluster_size;
389 ei->flags = p_dir->flags;
390 inode->i_blocks += 1 << sbi->sect_per_clus_bits;
397 * Name Resolution Functions :
398 * Zero if it was successful; otherwise nonzero.
400 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
401 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
405 int lossy = NLS_NAME_NO_LOSSY;
406 struct super_block *sb = inode->i_sb;
407 struct exfat_sb_info *sbi = EXFAT_SB(sb);
408 struct exfat_inode_info *ei = EXFAT_I(inode);
409 int pathlen = strlen(path);
412 * get the length of the pathname excluding
413 * trailing periods, if any.
415 namelen = exfat_striptail_len(pathlen, path, false);
416 if (EXFAT_SB(sb)->options.keep_last_dots) {
418 * Do not allow the creation of files with names
419 * ending with period(s).
421 if (!lookup && (namelen < pathlen))
427 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
428 return -ENAMETOOLONG;
431 * strip all leading spaces :
432 * "MS windows 7" supports leading spaces.
433 * So we should skip this preprocessing for compatibility.
436 /* file name conversion :
437 * If lookup case, we allow bad-name for compatibility.
439 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
442 return namelen; /* return error value */
444 if ((lossy && !lookup) || !namelen)
445 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
447 exfat_chain_set(p_dir, ei->start_clu,
448 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
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)
457 return __exfat_resolve_path(inode, path, dir, uni, 0);
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)
464 return __exfat_resolve_path(inode, path, dir, uni, 1);
467 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
469 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
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)
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;
482 unsigned int start_clu = EXFAT_FREE_CLUSTER;
484 ret = exfat_resolve_path(inode, path, p_dir, &uniname);
488 num_entries = exfat_calc_num_entries(&uniname);
489 if (num_entries < 0) {
494 /* exfat_find_empty_entry must be called before alloc_cluster() */
495 dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
497 ret = dentry; /* -EIO or -ENOSPC */
501 if (type == TYPE_DIR) {
502 ret = exfat_alloc_new_dir(inode, &clu);
506 clu_size = sbi->cluster_size;
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)
513 ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
514 start_clu, clu_size);
518 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
523 info->entry = dentry;
524 info->flags = ALLOC_NO_FAT_CHAIN;
527 if (type == TYPE_FILE) {
528 info->attr = ATTR_ARCHIVE;
529 info->start_clu = EXFAT_EOF_CLUSTER;
531 info->num_subdirs = 0;
533 info->attr = ATTR_SUBDIR;
534 info->start_clu = start_clu;
535 info->size = clu_size;
536 info->num_subdirs = EXFAT_MIN_SUBDIR;
538 memset(&info->crtime, 0, sizeof(info->crtime));
539 memset(&info->mtime, 0, sizeof(info->mtime));
540 memset(&info->atime, 0, sizeof(info->atime));
545 static int exfat_create(struct user_namespace *mnt_userns, struct inode *dir,
546 struct dentry *dentry, umode_t mode, bool excl)
548 struct super_block *sb = dir->i_sb;
550 struct exfat_chain cdir;
551 struct exfat_dir_entry info;
555 mutex_lock(&EXFAT_SB(sb)->s_lock);
556 exfat_set_volume_dirty(sb);
557 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
562 inode_inc_iversion(dir);
563 dir->i_ctime = dir->i_mtime = current_time(dir);
565 exfat_sync_inode(dir);
567 mark_inode_dirty(dir);
569 i_pos = exfat_make_i_pos(&info);
570 inode = exfat_build_inode(sb, &info, i_pos);
571 err = PTR_ERR_OR_ZERO(inode);
575 inode_inc_iversion(inode);
576 inode->i_mtime = inode->i_atime = inode->i_ctime =
577 EXFAT_I(inode)->i_crtime = current_time(inode);
578 exfat_truncate_atime(&inode->i_atime);
579 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
581 d_instantiate(dentry, inode);
583 mutex_unlock(&EXFAT_SB(sb)->s_lock);
588 static int exfat_find(struct inode *dir, struct qstr *qname,
589 struct exfat_dir_entry *info)
591 int ret, dentry, num_entries, count;
592 struct exfat_chain cdir;
593 struct exfat_uni_name uni_name;
594 struct super_block *sb = dir->i_sb;
595 struct exfat_sb_info *sbi = EXFAT_SB(sb);
596 struct exfat_inode_info *ei = EXFAT_I(dir);
597 struct exfat_dentry *ep, *ep2;
598 struct exfat_entry_set_cache *es;
599 /* for optimized dir & entry to prevent long traverse of cluster chain */
600 struct exfat_hint hint_opt;
605 /* check the validity of directory name in the given pathname */
606 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
610 num_entries = exfat_calc_num_entries(&uni_name);
614 /* check the validation of hint_stat and initialize it if required */
615 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
616 ei->hint_stat.clu = cdir.dir;
617 ei->hint_stat.eidx = 0;
618 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
619 ei->hint_femp.eidx = EXFAT_HINT_NONE;
622 /* search the file name for directories */
623 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
624 num_entries, TYPE_ALL, &hint_opt);
627 return dentry; /* -error value */
630 info->entry = dentry;
631 info->num_subdirs = 0;
633 /* adjust cdir to the optimized value */
634 cdir.dir = hint_opt.clu;
635 if (cdir.flags & ALLOC_NO_FAT_CHAIN)
636 cdir.size -= dentry / sbi->dentries_per_clu;
637 dentry = hint_opt.eidx;
638 es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
641 ep = exfat_get_dentry_cached(es, 0);
642 ep2 = exfat_get_dentry_cached(es, 1);
644 info->type = exfat_get_entry_type(ep);
645 info->attr = le16_to_cpu(ep->dentry.file.attr);
646 info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
647 if ((info->type == TYPE_FILE) && (info->size == 0)) {
648 info->flags = ALLOC_NO_FAT_CHAIN;
649 info->start_clu = EXFAT_EOF_CLUSTER;
651 info->flags = ep2->dentry.stream.flags;
653 le32_to_cpu(ep2->dentry.stream.start_clu);
656 exfat_get_entry_time(sbi, &info->crtime,
657 ep->dentry.file.create_tz,
658 ep->dentry.file.create_time,
659 ep->dentry.file.create_date,
660 ep->dentry.file.create_time_cs);
661 exfat_get_entry_time(sbi, &info->mtime,
662 ep->dentry.file.modify_tz,
663 ep->dentry.file.modify_time,
664 ep->dentry.file.modify_date,
665 ep->dentry.file.modify_time_cs);
666 exfat_get_entry_time(sbi, &info->atime,
667 ep->dentry.file.access_tz,
668 ep->dentry.file.access_time,
669 ep->dentry.file.access_date,
671 exfat_free_dentry_set(es, false);
673 if (ei->start_clu == EXFAT_FREE_CLUSTER) {
675 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
676 i_size_read(dir), ei->dir.dir, ei->entry);
680 if (info->type == TYPE_DIR) {
681 exfat_chain_set(&cdir, info->start_clu,
682 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
683 count = exfat_count_dir_entries(sb, &cdir);
687 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
692 static int exfat_d_anon_disconn(struct dentry *dentry)
694 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
697 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
700 struct super_block *sb = dir->i_sb;
702 struct dentry *alias;
703 struct exfat_dir_entry info;
708 mutex_lock(&EXFAT_SB(sb)->s_lock);
709 err = exfat_find(dir, &dentry->d_name, &info);
711 if (err == -ENOENT) {
718 i_pos = exfat_make_i_pos(&info);
719 inode = exfat_build_inode(sb, &info, i_pos);
720 err = PTR_ERR_OR_ZERO(inode);
724 i_mode = inode->i_mode;
725 alias = d_find_alias(inode);
728 * Checking "alias->d_parent == dentry->d_parent" to make sure
729 * FS is not corrupted (especially double linked dir).
731 if (alias && alias->d_parent == dentry->d_parent &&
732 !exfat_d_anon_disconn(alias)) {
735 * Unhashed alias is able to exist because of revalidate()
736 * called by lookup_fast. You can easily make this status
737 * by calling create and lookup concurrently
738 * In such case, we reuse an alias instead of new dentry
740 if (d_unhashed(alias)) {
741 WARN_ON(alias->d_name.hash_len !=
742 dentry->d_name.hash_len);
743 exfat_info(sb, "rehashed a dentry(%p) in read lookup",
747 } else if (!S_ISDIR(i_mode)) {
749 * This inode has non anonymous-DCACHE_DISCONNECTED
750 * dentry. This means, the user did ->lookup() by an
751 * another name (longname vs 8.3 alias of it) in past.
753 * Switch to new one for reason of locality if possible.
755 d_move(alias, dentry);
758 mutex_unlock(&EXFAT_SB(sb)->s_lock);
763 mutex_unlock(&EXFAT_SB(sb)->s_lock);
765 exfat_d_version_set(dentry, inode_query_iversion(dir));
767 return d_splice_alias(inode, dentry);
769 mutex_unlock(&EXFAT_SB(sb)->s_lock);
773 /* remove an entry, BUT don't truncate */
774 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
776 struct exfat_chain cdir;
777 struct exfat_dentry *ep;
778 struct super_block *sb = dir->i_sb;
779 struct inode *inode = dentry->d_inode;
780 struct exfat_inode_info *ei = EXFAT_I(inode);
781 struct buffer_head *bh;
782 int num_entries, entry, err = 0;
784 mutex_lock(&EXFAT_SB(sb)->s_lock);
785 exfat_chain_dup(&cdir, &ei->dir);
787 if (ei->dir.dir == DIR_DELETED) {
788 exfat_err(sb, "abnormal access to deleted dentry");
793 ep = exfat_get_dentry(sb, &cdir, entry, &bh);
798 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
799 if (num_entries < 0) {
807 exfat_set_volume_dirty(sb);
808 /* update the directory entry */
809 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
814 /* This doesn't modify ei */
815 ei->dir.dir = DIR_DELETED;
817 inode_inc_iversion(dir);
818 dir->i_mtime = dir->i_atime = current_time(dir);
819 exfat_truncate_atime(&dir->i_atime);
821 exfat_sync_inode(dir);
823 mark_inode_dirty(dir);
826 inode->i_mtime = inode->i_atime = current_time(inode);
827 exfat_truncate_atime(&inode->i_atime);
828 exfat_unhash_inode(inode);
829 exfat_d_version_set(dentry, inode_query_iversion(dir));
831 mutex_unlock(&EXFAT_SB(sb)->s_lock);
835 static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
836 struct dentry *dentry, umode_t mode)
838 struct super_block *sb = dir->i_sb;
840 struct exfat_dir_entry info;
841 struct exfat_chain cdir;
845 mutex_lock(&EXFAT_SB(sb)->s_lock);
846 exfat_set_volume_dirty(sb);
847 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
852 inode_inc_iversion(dir);
853 dir->i_ctime = dir->i_mtime = current_time(dir);
855 exfat_sync_inode(dir);
857 mark_inode_dirty(dir);
860 i_pos = exfat_make_i_pos(&info);
861 inode = exfat_build_inode(sb, &info, i_pos);
862 err = PTR_ERR_OR_ZERO(inode);
866 inode_inc_iversion(inode);
867 inode->i_mtime = inode->i_atime = inode->i_ctime =
868 EXFAT_I(inode)->i_crtime = current_time(inode);
869 exfat_truncate_atime(&inode->i_atime);
870 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
872 d_instantiate(dentry, inode);
875 mutex_unlock(&EXFAT_SB(sb)->s_lock);
879 static int exfat_check_dir_empty(struct super_block *sb,
880 struct exfat_chain *p_dir)
882 int i, dentries_per_clu;
884 struct exfat_chain clu;
885 struct exfat_dentry *ep;
886 struct exfat_sb_info *sbi = EXFAT_SB(sb);
887 struct buffer_head *bh;
889 dentries_per_clu = sbi->dentries_per_clu;
891 exfat_chain_dup(&clu, p_dir);
893 while (clu.dir != EXFAT_EOF_CLUSTER) {
894 for (i = 0; i < dentries_per_clu; i++) {
895 ep = exfat_get_dentry(sb, &clu, i, &bh);
898 type = exfat_get_entry_type(ep);
900 if (type == TYPE_UNUSED)
903 if (type != TYPE_FILE && type != TYPE_DIR)
909 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
913 clu.dir = EXFAT_EOF_CLUSTER;
915 if (exfat_get_next_cluster(sb, &(clu.dir)))
923 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
925 struct inode *inode = dentry->d_inode;
926 struct exfat_dentry *ep;
927 struct exfat_chain cdir, clu_to_free;
928 struct super_block *sb = inode->i_sb;
929 struct exfat_sb_info *sbi = EXFAT_SB(sb);
930 struct exfat_inode_info *ei = EXFAT_I(inode);
931 struct buffer_head *bh;
932 int num_entries, entry, err;
934 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
936 exfat_chain_dup(&cdir, &ei->dir);
939 if (ei->dir.dir == DIR_DELETED) {
940 exfat_err(sb, "abnormal access to deleted dentry");
945 exfat_chain_set(&clu_to_free, ei->start_clu,
946 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
948 err = exfat_check_dir_empty(sb, &clu_to_free);
951 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
956 ep = exfat_get_dentry(sb, &cdir, entry, &bh);
962 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
963 if (num_entries < 0) {
971 exfat_set_volume_dirty(sb);
972 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
974 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
977 ei->dir.dir = DIR_DELETED;
979 inode_inc_iversion(dir);
980 dir->i_mtime = dir->i_atime = current_time(dir);
981 exfat_truncate_atime(&dir->i_atime);
983 exfat_sync_inode(dir);
985 mark_inode_dirty(dir);
989 inode->i_mtime = inode->i_atime = current_time(inode);
990 exfat_truncate_atime(&inode->i_atime);
991 exfat_unhash_inode(inode);
992 exfat_d_version_set(dentry, inode_query_iversion(dir));
994 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
998 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
999 int oldentry, struct exfat_uni_name *p_uniname,
1000 struct exfat_inode_info *ei)
1002 int ret, num_old_entries, num_new_entries;
1003 struct exfat_dentry *epold, *epnew;
1004 struct super_block *sb = inode->i_sb;
1005 struct buffer_head *new_bh, *old_bh;
1006 int sync = IS_DIRSYNC(inode);
1008 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh);
1012 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1013 if (num_old_entries < 0)
1017 num_new_entries = exfat_calc_num_entries(p_uniname);
1018 if (num_new_entries < 0)
1019 return num_new_entries;
1021 if (num_old_entries < num_new_entries) {
1025 exfat_find_empty_entry(inode, p_dir, num_new_entries);
1027 return newentry; /* -EIO or -ENOSPC */
1029 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh);
1034 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1035 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1036 ei->attr |= ATTR_ARCHIVE;
1038 exfat_update_bh(new_bh, sync);
1042 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh);
1045 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh);
1052 exfat_update_bh(new_bh, sync);
1056 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1057 num_new_entries, p_uniname);
1061 exfat_remove_entries(inode, p_dir, oldentry, 0,
1064 ei->entry = newentry;
1066 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1067 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1068 ei->attr |= ATTR_ARCHIVE;
1070 exfat_update_bh(old_bh, sync);
1072 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1073 num_new_entries, p_uniname);
1077 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1083 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1084 int oldentry, struct exfat_chain *p_newdir,
1085 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1087 int ret, newentry, num_new_entries, num_old_entries;
1088 struct exfat_dentry *epmov, *epnew;
1089 struct super_block *sb = inode->i_sb;
1090 struct buffer_head *mov_bh, *new_bh;
1092 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh);
1096 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1098 if (num_old_entries < 0)
1102 num_new_entries = exfat_calc_num_entries(p_uniname);
1103 if (num_new_entries < 0)
1104 return num_new_entries;
1106 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1108 return newentry; /* -EIO or -ENOSPC */
1110 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh);
1115 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1116 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1117 ei->attr |= ATTR_ARCHIVE;
1119 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1123 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh);
1126 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh);
1133 exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1137 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1142 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1144 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1147 ei->entry = newentry;
1151 /* rename or move a old file into a new file */
1152 static int __exfat_rename(struct inode *old_parent_inode,
1153 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1154 struct dentry *new_dentry)
1158 struct exfat_chain olddir, newdir;
1159 struct exfat_chain *p_dir = NULL;
1160 struct exfat_uni_name uni_name;
1161 struct exfat_dentry *ep;
1162 struct super_block *sb = old_parent_inode->i_sb;
1163 struct exfat_sb_info *sbi = EXFAT_SB(sb);
1164 const unsigned char *new_path = new_dentry->d_name.name;
1165 struct inode *new_inode = new_dentry->d_inode;
1167 struct exfat_inode_info *new_ei = NULL;
1168 unsigned int new_entry_type = TYPE_UNUSED;
1170 struct buffer_head *old_bh, *new_bh = NULL;
1172 /* check the validity of pointer parameters */
1173 if (new_path == NULL || strlen(new_path) == 0)
1176 if (ei->dir.dir == DIR_DELETED) {
1177 exfat_err(sb, "abnormal access to deleted source dentry");
1181 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu,
1182 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi),
1183 EXFAT_I(old_parent_inode)->flags);
1186 ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh);
1193 /* check whether new dir is existing directory and empty */
1196 new_ei = EXFAT_I(new_inode);
1198 if (new_ei->dir.dir == DIR_DELETED) {
1199 exfat_err(sb, "abnormal access to deleted target dentry");
1203 p_dir = &(new_ei->dir);
1204 new_entry = new_ei->entry;
1205 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1209 new_entry_type = exfat_get_entry_type(ep);
1212 /* if new_inode exists, update ei */
1213 if (new_entry_type == TYPE_DIR) {
1214 struct exfat_chain new_clu;
1216 new_clu.dir = new_ei->start_clu;
1218 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1220 new_clu.flags = new_ei->flags;
1222 ret = exfat_check_dir_empty(sb, &new_clu);
1228 /* check the validity of directory name in the given new pathname */
1229 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1234 exfat_set_volume_dirty(sb);
1236 if (olddir.dir == newdir.dir)
1237 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1240 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1241 &newdir, &uni_name, ei);
1243 if (!ret && new_inode) {
1244 /* delete entries of new_dir */
1245 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1251 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1252 if (num_entries < 0) {
1258 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1264 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1265 if (new_entry_type == TYPE_DIR) {
1266 /* new_ei, new_clu_to_free */
1267 struct exfat_chain new_clu_to_free;
1269 exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1270 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1271 sbi), new_ei->flags);
1273 if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1274 /* just set I/O error only */
1278 i_size_write(new_inode, 0);
1279 new_ei->start_clu = EXFAT_EOF_CLUSTER;
1280 new_ei->flags = ALLOC_NO_FAT_CHAIN;
1283 /* Update new_inode ei
1284 * Prevent syncing removed new_inode
1285 * (new_ei is already initialized above code ("if (new_inode)")
1287 new_ei->dir.dir = DIR_DELETED;
1293 static int exfat_rename(struct user_namespace *mnt_userns,
1294 struct inode *old_dir, struct dentry *old_dentry,
1295 struct inode *new_dir, struct dentry *new_dentry,
1298 struct inode *old_inode, *new_inode;
1299 struct super_block *sb = old_dir->i_sb;
1304 * The VFS already checks for existence, so for local filesystems
1305 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1306 * Don't support any other flags
1308 if (flags & ~RENAME_NOREPLACE)
1311 mutex_lock(&EXFAT_SB(sb)->s_lock);
1312 old_inode = old_dentry->d_inode;
1313 new_inode = new_dentry->d_inode;
1315 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1319 inode_inc_iversion(new_dir);
1320 new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
1321 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1322 exfat_truncate_atime(&new_dir->i_atime);
1323 if (IS_DIRSYNC(new_dir))
1324 exfat_sync_inode(new_dir);
1326 mark_inode_dirty(new_dir);
1328 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1329 (EXFAT_I(old_inode)->entry & 0xffffffff);
1330 exfat_unhash_inode(old_inode);
1331 exfat_hash_inode(old_inode, i_pos);
1332 if (IS_DIRSYNC(new_dir))
1333 exfat_sync_inode(old_inode);
1335 mark_inode_dirty(old_inode);
1337 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1338 drop_nlink(old_dir);
1343 inode_inc_iversion(old_dir);
1344 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1345 if (IS_DIRSYNC(old_dir))
1346 exfat_sync_inode(old_dir);
1348 mark_inode_dirty(old_dir);
1351 exfat_unhash_inode(new_inode);
1353 /* skip drop_nlink if new_inode already has been dropped */
1354 if (new_inode->i_nlink) {
1355 drop_nlink(new_inode);
1356 if (S_ISDIR(new_inode->i_mode))
1357 drop_nlink(new_inode);
1359 exfat_warn(sb, "abnormal access to an inode dropped");
1360 WARN_ON(new_inode->i_nlink == 0);
1362 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
1363 current_time(new_inode);
1367 mutex_unlock(&EXFAT_SB(sb)->s_lock);
1371 const struct inode_operations exfat_dir_inode_operations = {
1372 .create = exfat_create,
1373 .lookup = exfat_lookup,
1374 .unlink = exfat_unlink,
1375 .mkdir = exfat_mkdir,
1376 .rmdir = exfat_rmdir,
1377 .rename = exfat_rename,
1378 .setattr = exfat_setattr,
1379 .getattr = exfat_getattr,