Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1386 insertions, 0 deletions

diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
new file mode 100644
index 0000000000..95c51b025b
--- /dev/null
+++ b/fs/exfat/namei.c
@@ -0,0 +1,1386 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/iversion.h>
+#include <linux/namei.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+#include <linux/nls.h>
+
+#include "exfat_raw.h"
+#include "exfat_fs.h"
+
+static inline unsigned long exfat_d_version(struct dentry *dentry)
+{
+	return (unsigned long) dentry->d_fsdata;
+}
+
+static inline void exfat_d_version_set(struct dentry *dentry,
+		unsigned long version)
+{
+	dentry->d_fsdata = (void *) version;
+}
+
+/*
+ * If new entry was created in the parent, it could create the 8.3 alias (the
+ * shortname of logname).  So, the parent may have the negative-dentry which
+ * matches the created 8.3 alias.
+ *
+ * If it happened, the negative dentry isn't actually negative anymore.  So,
+ * drop it.
+ */
+static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
+{
+	int ret;
+
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+
+	/*
+	 * This is not negative dentry. Always valid.
+	 *
+	 * Note, rename() to existing directory entry will have ->d_inode, and
+	 * will use existing name which isn't specified name by user.
+	 *
+	 * We may be able to drop this positive dentry here. But dropping
+	 * positive dentry isn't good idea. So it's unsupported like
+	 * rename("filename", "FILENAME") for now.
+	 */
+	if (d_really_is_positive(dentry))
+		return 1;
+
+	/*
+	 * Drop the negative dentry, in order to make sure to use the case
+	 * sensitive name which is specified by user if this is for creation.
+	 */
+	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
+		return 0;
+
+	spin_lock(&dentry->d_lock);
+	ret = inode_eq_iversion(d_inode(dentry->d_parent),
+			exfat_d_version(dentry));
+	spin_unlock(&dentry->d_lock);
+	return ret;
+}
+
+/* returns the length of a struct qstr, ignoring trailing dots if necessary */
+static unsigned int exfat_striptail_len(unsigned int len, const char *name,
+					bool keep_last_dots)
+{
+	if (!keep_last_dots) {
+		while (len && name[len - 1] == '.')
+			len--;
+	}
+	return len;
+}
+
+/*
+ * Compute the hash for the exfat name corresponding to the dentry.  If the name
+ * is invalid, we leave the hash code unchanged so that the existing dentry can
+ * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
+ */
+static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct nls_table *t = EXFAT_SB(sb)->nls_io;
+	const unsigned char *name = qstr->name;
+	unsigned int len = exfat_striptail_len(qstr->len, qstr->name,
+			   EXFAT_SB(sb)->options.keep_last_dots);
+	unsigned long hash = init_name_hash(dentry);
+	int i, charlen;
+	wchar_t c;
+
+	for (i = 0; i < len; i += charlen) {
+		charlen = t->char2uni(&name[i], len - i, &c);
+		if (charlen < 0)
+			return charlen;
+		hash = partial_name_hash(exfat_toupper(sb, c), hash);
+	}
+
+	qstr->hash = end_name_hash(hash);
+	return 0;
+}
+
+static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
+		const char *str, const struct qstr *name)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct nls_table *t = EXFAT_SB(sb)->nls_io;
+	unsigned int alen = exfat_striptail_len(name->len, name->name,
+				EXFAT_SB(sb)->options.keep_last_dots);
+	unsigned int blen = exfat_striptail_len(len, str,
+				EXFAT_SB(sb)->options.keep_last_dots);
+	wchar_t c1, c2;
+	int charlen, i;
+
+	if (alen != blen)
+		return 1;
+
+	for (i = 0; i < len; i += charlen) {
+		charlen = t->char2uni(&name->name[i], alen - i, &c1);
+		if (charlen < 0)
+			return 1;
+		if (charlen != t->char2uni(&str[i], blen - i, &c2))
+			return 1;
+
+		if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
+			return 1;
+	}
+
+	return 0;
+}
+
+const struct dentry_operations exfat_dentry_ops = {
+	.d_revalidate	= exfat_d_revalidate,
+	.d_hash		= exfat_d_hash,
+	.d_compare	= exfat_d_cmp,
+};
+
+static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
+{
+	struct super_block *sb = dentry->d_sb;
+	const unsigned char *name = qstr->name;
+	unsigned int len = exfat_striptail_len(qstr->len, qstr->name,
+			       EXFAT_SB(sb)->options.keep_last_dots);
+	unsigned long hash = init_name_hash(dentry);
+	int i, charlen;
+	unicode_t u;
+
+	for (i = 0; i < len; i += charlen) {
+		charlen = utf8_to_utf32(&name[i], len - i, &u);
+		if (charlen < 0)
+			return charlen;
+
+		/*
+		 * exfat_toupper() works only for code points up to the U+FFFF.
+		 */
+		hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
+					 hash);
+	}
+
+	qstr->hash = end_name_hash(hash);
+	return 0;
+}
+
+static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
+		const char *str, const struct qstr *name)
+{
+	struct super_block *sb = dentry->d_sb;
+	unsigned int alen = exfat_striptail_len(name->len, name->name,
+				EXFAT_SB(sb)->options.keep_last_dots);
+	unsigned int blen = exfat_striptail_len(len, str,
+				EXFAT_SB(sb)->options.keep_last_dots);
+
+	unicode_t u_a, u_b;
+	int charlen, i;
+
+	if (alen != blen)
+		return 1;
+
+	for (i = 0; i < alen; i += charlen) {
+		charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
+		if (charlen < 0)
+			return 1;
+		if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
+			return 1;
+
+		if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
+			if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
+				return 1;
+		} else {
+			if (u_a != u_b)
+				return 1;
+		}
+	}
+
+	return 0;
+}
+
+const struct dentry_operations exfat_utf8_dentry_ops = {
+	.d_revalidate	= exfat_d_revalidate,
+	.d_hash		= exfat_utf8_d_hash,
+	.d_compare	= exfat_utf8_d_cmp,
+};
+
+/* used only in search empty_slot() */
+#define CNT_UNUSED_NOHIT        (-1)
+#define CNT_UNUSED_HIT          (-2)
+/* search EMPTY CONTINUOUS "num_entries" entries */
+static int exfat_search_empty_slot(struct super_block *sb,
+		struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
+		int num_entries)
+{
+	int i, dentry, num_empty = 0;
+	int dentries_per_clu;
+	unsigned int type;
+	struct exfat_chain clu;
+	struct exfat_dentry *ep;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct buffer_head *bh;
+
+	dentries_per_clu = sbi->dentries_per_clu;
+
+	if (hint_femp->eidx != EXFAT_HINT_NONE) {
+		dentry = hint_femp->eidx;
+
+		/*
+		 * If hint_femp->count is enough, it is needed to check if
+		 * there are actual empty entries.
+		 * Otherwise, and if "dentry + hint_famp->count" is also equal
+		 * to "p_dir->size * dentries_per_clu", it means ENOSPC.
+		 */
+		if (dentry + hint_femp->count == p_dir->size * dentries_per_clu &&
+		    num_entries > hint_femp->count)
+			return -ENOSPC;
+
+		hint_femp->eidx = EXFAT_HINT_NONE;
+		exfat_chain_dup(&clu, &hint_femp->cur);
+	} else {
+		exfat_chain_dup(&clu, p_dir);
+		dentry = 0;
+	}
+
+	while (clu.dir != EXFAT_EOF_CLUSTER) {
+		i = dentry & (dentries_per_clu - 1);
+
+		for (; i < dentries_per_clu; i++, dentry++) {
+			ep = exfat_get_dentry(sb, &clu, i, &bh);
+			if (!ep)
+				return -EIO;
+			type = exfat_get_entry_type(ep);
+			brelse(bh);
+
+			if (type == TYPE_UNUSED || type == TYPE_DELETED) {
+				num_empty++;
+				if (hint_femp->eidx == EXFAT_HINT_NONE) {
+					hint_femp->eidx = dentry;
+					hint_femp->count = CNT_UNUSED_NOHIT;
+					exfat_chain_set(&hint_femp->cur,
+						clu.dir, clu.size, clu.flags);
+				}
+
+				if (type == TYPE_UNUSED &&
+				    hint_femp->count != CNT_UNUSED_HIT)
+					hint_femp->count = CNT_UNUSED_HIT;
+			} else {
+				if (hint_femp->eidx != EXFAT_HINT_NONE &&
+				    hint_femp->count == CNT_UNUSED_HIT) {
+					/* unused empty group means
+					 * an empty group which includes
+					 * unused dentry
+					 */
+					exfat_fs_error(sb,
+						"found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
+						dentry, hint_femp->eidx,
+						p_dir->dir, clu.dir);
+					return -EIO;
+				}
+
+				num_empty = 0;
+				hint_femp->eidx = EXFAT_HINT_NONE;
+			}
+
+			if (num_empty >= num_entries) {
+				/* found and invalidate hint_femp */
+				hint_femp->eidx = EXFAT_HINT_NONE;
+				return (dentry - (num_entries - 1));
+			}
+		}
+
+		if (clu.flags == ALLOC_NO_FAT_CHAIN) {
+			if (--clu.size > 0)
+				clu.dir++;
+			else
+				clu.dir = EXFAT_EOF_CLUSTER;
+		} else {
+			if (exfat_get_next_cluster(sb, &clu.dir))
+				return -EIO;
+		}
+	}
+
+	hint_femp->eidx = p_dir->size * dentries_per_clu - num_empty;
+	hint_femp->count = num_empty;
+	if (num_empty == 0)
+		exfat_chain_set(&hint_femp->cur, EXFAT_EOF_CLUSTER, 0,
+				clu.flags);
+
+	return -ENOSPC;
+}
+
+static int exfat_check_max_dentries(struct inode *inode)
+{
+	if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
+		/*
+		 * exFAT spec allows a dir to grow up to 8388608(256MB)
+		 * dentries
+		 */
+		return -ENOSPC;
+	}
+	return 0;
+}
+
+/* find empty directory entry.
+ * if there isn't any empty slot, expand cluster chain.
+ */
+static int exfat_find_empty_entry(struct inode *inode,
+		struct exfat_chain *p_dir, int num_entries)
+{
+	int dentry;
+	unsigned int ret, last_clu;
+	loff_t size = 0;
+	struct exfat_chain clu;
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *ei = EXFAT_I(inode);
+	struct exfat_hint_femp hint_femp;
+
+	hint_femp.eidx = EXFAT_HINT_NONE;
+
+	if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
+		hint_femp = ei->hint_femp;
+		ei->hint_femp.eidx = EXFAT_HINT_NONE;
+	}
+
+	while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
+					num_entries)) < 0) {
+		if (dentry == -EIO)
+			break;
+
+		if (exfat_check_max_dentries(inode))
+			return -ENOSPC;
+
+		/*
+		 * Allocate new cluster to this directory
+		 */
+		if (ei->start_clu != EXFAT_EOF_CLUSTER) {
+			/* we trust p_dir->size regardless of FAT type */
+			if (exfat_find_last_cluster(sb, p_dir, &last_clu))
+				return -EIO;
+
+			exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
+		} else {
+			/* This directory is empty */
+			exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0,
+					ALLOC_NO_FAT_CHAIN);
+		}
+
+		/* allocate a cluster */
+		ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
+		if (ret)
+			return ret;
+
+		if (exfat_zeroed_cluster(inode, clu.dir))
+			return -EIO;
+
+		if (ei->start_clu == EXFAT_EOF_CLUSTER) {
+			ei->start_clu = clu.dir;
+			p_dir->dir = clu.dir;
+		}
+
+		/* append to the FAT chain */
+		if (clu.flags != p_dir->flags) {
+			/* no-fat-chain bit is disabled,
+			 * so fat-chain should be synced with alloc-bitmap
+			 */
+			exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
+			p_dir->flags = ALLOC_FAT_CHAIN;
+			hint_femp.cur.flags = ALLOC_FAT_CHAIN;
+		}
+
+		if (clu.flags == ALLOC_FAT_CHAIN)
+			if (exfat_ent_set(sb, last_clu, clu.dir))
+				return -EIO;
+
+		if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER)
+			exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
+
+		hint_femp.count += sbi->dentries_per_clu;
+
+		hint_femp.cur.size++;
+		p_dir->size++;
+		size = EXFAT_CLU_TO_B(p_dir->size, sbi);
+
+		/* directory inode should be updated in here */
+		i_size_write(inode, size);
+		ei->i_size_ondisk += sbi->cluster_size;
+		ei->i_size_aligned += sbi->cluster_size;
+		ei->flags = p_dir->flags;
+		inode->i_blocks += sbi->cluster_size >> 9;
+	}
+
+	return dentry;
+}
+
+/*
+ * Name Resolution Functions :
+ * Zero if it was successful; otherwise nonzero.
+ */
+static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
+		struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
+		int lookup)
+{
+	int namelen;
+	int lossy = NLS_NAME_NO_LOSSY;
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *ei = EXFAT_I(inode);
+	int pathlen = strlen(path);
+
+	/*
+	 * get the length of the pathname excluding
+	 * trailing periods, if any.
+	 */
+	namelen = exfat_striptail_len(pathlen, path, false);
+	if (EXFAT_SB(sb)->options.keep_last_dots) {
+		/*
+		 * Do not allow the creation of files with names
+		 * ending with period(s).
+		 */
+		if (!lookup && (namelen < pathlen))
+			return -EINVAL;
+		namelen = pathlen;
+	}
+	if (!namelen)
+		return -ENOENT;
+	if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
+		return -ENAMETOOLONG;
+
+	/*
+	 * strip all leading spaces :
+	 * "MS windows 7" supports leading spaces.
+	 * So we should skip this preprocessing for compatibility.
+	 */
+
+	/* file name conversion :
+	 * If lookup case, we allow bad-name for compatibility.
+	 */
+	namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
+			&lossy);
+	if (namelen < 0)
+		return namelen; /* return error value */
+
+	if ((lossy && !lookup) || !namelen)
+		return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
+
+	exfat_chain_set(p_dir, ei->start_clu,
+		EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
+
+	return 0;
+}
+
+static inline int exfat_resolve_path(struct inode *inode,
+		const unsigned char *path, struct exfat_chain *dir,
+		struct exfat_uni_name *uni)
+{
+	return __exfat_resolve_path(inode, path, dir, uni, 0);
+}
+
+static inline int exfat_resolve_path_for_lookup(struct inode *inode,
+		const unsigned char *path, struct exfat_chain *dir,
+		struct exfat_uni_name *uni)
+{
+	return __exfat_resolve_path(inode, path, dir, uni, 1);
+}
+
+static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
+{
+	return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
+}
+
+static int exfat_add_entry(struct inode *inode, const char *path,
+		struct exfat_chain *p_dir, unsigned int type,
+		struct exfat_dir_entry *info)
+{
+	int ret, dentry, num_entries;
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_uni_name uniname;
+	struct exfat_chain clu;
+	int clu_size = 0;
+	unsigned int start_clu = EXFAT_FREE_CLUSTER;
+
+	ret = exfat_resolve_path(inode, path, p_dir, &uniname);
+	if (ret)
+		goto out;
+
+	num_entries = exfat_calc_num_entries(&uniname);
+	if (num_entries < 0) {
+		ret = num_entries;
+		goto out;
+	}
+
+	/* exfat_find_empty_entry must be called before alloc_cluster() */
+	dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
+	if (dentry < 0) {
+		ret = dentry; /* -EIO or -ENOSPC */
+		goto out;
+	}
+
+	if (type == TYPE_DIR) {
+		ret = exfat_alloc_new_dir(inode, &clu);
+		if (ret)
+			goto out;
+		start_clu = clu.dir;
+		clu_size = sbi->cluster_size;
+	}
+
+	/* update the directory entry */
+	/* fill the dos name directory entry information of the created file.
+	 * the first cluster is not determined yet. (0)
+	 */
+	ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
+		start_clu, clu_size);
+	if (ret)
+		goto out;
+
+	ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
+	if (ret)
+		goto out;
+
+	info->dir = *p_dir;
+	info->entry = dentry;
+	info->flags = ALLOC_NO_FAT_CHAIN;
+	info->type = type;
+
+	if (type == TYPE_FILE) {
+		info->attr = ATTR_ARCHIVE;
+		info->start_clu = EXFAT_EOF_CLUSTER;
+		info->size = 0;
+		info->num_subdirs = 0;
+	} else {
+		info->attr = ATTR_SUBDIR;
+		info->start_clu = start_clu;
+		info->size = clu_size;
+		info->num_subdirs = EXFAT_MIN_SUBDIR;
+	}
+	memset(&info->crtime, 0, sizeof(info->crtime));
+	memset(&info->mtime, 0, sizeof(info->mtime));
+	memset(&info->atime, 0, sizeof(info->atime));
+out:
+	return ret;
+}
+
+static int exfat_create(struct mnt_idmap *idmap, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct exfat_chain cdir;
+	struct exfat_dir_entry info;
+	loff_t i_pos;
+	int err;
+
+	mutex_lock(&EXFAT_SB(sb)->s_lock);
+	exfat_set_volume_dirty(sb);
+	err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
+		&info);
+	if (err)
+		goto unlock;
+
+	inode_inc_iversion(dir);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	if (IS_DIRSYNC(dir))
+		exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	i_pos = exfat_make_i_pos(&info);
+	inode = exfat_build_inode(sb, &info, i_pos);
+	err = PTR_ERR_OR_ZERO(inode);
+	if (err)
+		goto unlock;
+
+	inode_inc_iversion(inode);
+	inode->i_mtime = inode->i_atime = EXFAT_I(inode)->i_crtime = inode_set_ctime_current(inode);
+	exfat_truncate_atime(&inode->i_atime);
+	/* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+	d_instantiate(dentry, inode);
+unlock:
+	mutex_unlock(&EXFAT_SB(sb)->s_lock);
+	return err;
+}
+
+/* lookup a file */
+static int exfat_find(struct inode *dir, struct qstr *qname,
+		struct exfat_dir_entry *info)
+{
+	int ret, dentry, count;
+	struct exfat_chain cdir;
+	struct exfat_uni_name uni_name;
+	struct super_block *sb = dir->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *ei = EXFAT_I(dir);
+	struct exfat_dentry *ep, *ep2;
+	struct exfat_entry_set_cache es;
+	/* for optimized dir & entry to prevent long traverse of cluster chain */
+	struct exfat_hint hint_opt;
+
+	if (qname->len == 0)
+		return -ENOENT;
+
+	/* check the validity of directory name in the given pathname */
+	ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
+	if (ret)
+		return ret;
+
+	/* check the validation of hint_stat and initialize it if required */
+	if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
+		ei->hint_stat.clu = cdir.dir;
+		ei->hint_stat.eidx = 0;
+		ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
+		ei->hint_femp.eidx = EXFAT_HINT_NONE;
+	}
+
+	/* search the file name for directories */
+	dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt);
+	if (dentry < 0)
+		return dentry; /* -error value */
+
+	info->dir = cdir;
+	info->entry = dentry;
+	info->num_subdirs = 0;
+
+	/* adjust cdir to the optimized value */
+	cdir.dir = hint_opt.clu;
+	if (cdir.flags & ALLOC_NO_FAT_CHAIN)
+		cdir.size -= dentry / sbi->dentries_per_clu;
+	dentry = hint_opt.eidx;
+	if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES))
+		return -EIO;
+	ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
+	ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
+
+	info->type = exfat_get_entry_type(ep);
+	info->attr = le16_to_cpu(ep->dentry.file.attr);
+	info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
+	if (info->size == 0) {
+		info->flags = ALLOC_NO_FAT_CHAIN;
+		info->start_clu = EXFAT_EOF_CLUSTER;
+	} else {
+		info->flags = ep2->dentry.stream.flags;
+		info->start_clu =
+			le32_to_cpu(ep2->dentry.stream.start_clu);
+	}
+
+	exfat_get_entry_time(sbi, &info->crtime,
+			     ep->dentry.file.create_tz,
+			     ep->dentry.file.create_time,
+			     ep->dentry.file.create_date,
+			     ep->dentry.file.create_time_cs);
+	exfat_get_entry_time(sbi, &info->mtime,
+			     ep->dentry.file.modify_tz,
+			     ep->dentry.file.modify_time,
+			     ep->dentry.file.modify_date,
+			     ep->dentry.file.modify_time_cs);
+	exfat_get_entry_time(sbi, &info->atime,
+			     ep->dentry.file.access_tz,
+			     ep->dentry.file.access_time,
+			     ep->dentry.file.access_date,
+			     0);
+	exfat_put_dentry_set(&es, false);
+
+	if (ei->start_clu == EXFAT_FREE_CLUSTER) {
+		exfat_fs_error(sb,
+			       "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
+			       i_size_read(dir), ei->dir.dir, ei->entry);
+		return -EIO;
+	}
+
+	if (info->type == TYPE_DIR) {
+		exfat_chain_set(&cdir, info->start_clu,
+				EXFAT_B_TO_CLU(info->size, sbi), info->flags);
+		count = exfat_count_dir_entries(sb, &cdir);
+		if (count < 0)
+			return -EIO;
+
+		info->num_subdirs = count + EXFAT_MIN_SUBDIR;
+	}
+	return 0;
+}
+
+static int exfat_d_anon_disconn(struct dentry *dentry)
+{
+	return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
+}
+
+static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
+		unsigned int flags)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct dentry *alias;
+	struct exfat_dir_entry info;
+	int err;
+	loff_t i_pos;
+	mode_t i_mode;
+
+	mutex_lock(&EXFAT_SB(sb)->s_lock);
+	err = exfat_find(dir, &dentry->d_name, &info);
+	if (err) {
+		if (err == -ENOENT) {
+			inode = NULL;
+			goto out;
+		}
+		goto unlock;
+	}
+
+	i_pos = exfat_make_i_pos(&info);
+	inode = exfat_build_inode(sb, &info, i_pos);
+	err = PTR_ERR_OR_ZERO(inode);
+	if (err)
+		goto unlock;
+
+	i_mode = inode->i_mode;
+	alias = d_find_alias(inode);
+
+	/*
+	 * Checking "alias->d_parent == dentry->d_parent" to make sure
+	 * FS is not corrupted (especially double linked dir).
+	 */
+	if (alias && alias->d_parent == dentry->d_parent &&
+			!exfat_d_anon_disconn(alias)) {
+
+		/*
+		 * Unhashed alias is able to exist because of revalidate()
+		 * called by lookup_fast. You can easily make this status
+		 * by calling create and lookup concurrently
+		 * In such case, we reuse an alias instead of new dentry
+		 */
+		if (d_unhashed(alias)) {
+			WARN_ON(alias->d_name.hash_len !=
+				dentry->d_name.hash_len);
+			exfat_info(sb, "rehashed a dentry(%p) in read lookup",
+				   alias);
+			d_drop(dentry);
+			d_rehash(alias);
+		} else if (!S_ISDIR(i_mode)) {
+			/*
+			 * This inode has non anonymous-DCACHE_DISCONNECTED
+			 * dentry. This means, the user did ->lookup() by an
+			 * another name (longname vs 8.3 alias of it) in past.
+			 *
+			 * Switch to new one for reason of locality if possible.
+			 */
+			d_move(alias, dentry);
+		}
+		iput(inode);
+		mutex_unlock(&EXFAT_SB(sb)->s_lock);
+		return alias;
+	}
+	dput(alias);
+out:
+	mutex_unlock(&EXFAT_SB(sb)->s_lock);
+	if (!inode)
+		exfat_d_version_set(dentry, inode_query_iversion(dir));
+
+	return d_splice_alias(inode, dentry);
+unlock:
+	mutex_unlock(&EXFAT_SB(sb)->s_lock);
+	return ERR_PTR(err);
+}
+
+/* remove an entry, BUT don't truncate */
+static int exfat_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct exfat_chain cdir;
+	struct exfat_dentry *ep;
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode = dentry->d_inode;
+	struct exfat_inode_info *ei = EXFAT_I(inode);
+	struct buffer_head *bh;
+	int num_entries, entry, err = 0;
+
+	mutex_lock(&EXFAT_SB(sb)->s_lock);
+	exfat_chain_dup(&cdir, &ei->dir);
+	entry = ei->entry;
+	if (ei->dir.dir == DIR_DELETED) {
+		exfat_err(sb, "abnormal access to deleted dentry");
+		err = -ENOENT;
+		goto unlock;
+	}
+
+	ep = exfat_get_dentry(sb, &cdir, entry, &bh);
+	if (!ep) {
+		err = -EIO;
+		goto unlock;
+	}
+	num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
+	if (num_entries < 0) {
+		err = -EIO;
+		brelse(bh);
+		goto unlock;
+	}
+	num_entries++;
+	brelse(bh);
+
+	exfat_set_volume_dirty(sb);
+	/* update the directory entry */
+	if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
+		err = -EIO;
+		goto unlock;
+	}
+
+	/* This doesn't modify ei */
+	ei->dir.dir = DIR_DELETED;
+
+	inode_inc_iversion(dir);
+	dir->i_mtime = dir->i_atime = inode_set_ctime_current(dir);
+	exfat_truncate_atime(&dir->i_atime);
+	if (IS_DIRSYNC(dir))
+		exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+
+	clear_nlink(inode);
+	inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
+	exfat_truncate_atime(&inode->i_atime);
+	exfat_unhash_inode(inode);
+	exfat_d_version_set(dentry, inode_query_iversion(dir));
+unlock:
+	mutex_unlock(&EXFAT_SB(sb)->s_lock);
+	return err;
+}
+
+static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
+{
+	struct super_block *sb = dir->i_sb;
+	struct inode *inode;
+	struct exfat_dir_entry info;
+	struct exfat_chain cdir;
+	loff_t i_pos;
+	int err;
+
+	mutex_lock(&EXFAT_SB(sb)->s_lock);
+	exfat_set_volume_dirty(sb);
+	err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
+		&info);
+	if (err)
+		goto unlock;
+
+	inode_inc_iversion(dir);
+	dir->i_mtime = inode_set_ctime_current(dir);
+	if (IS_DIRSYNC(dir))
+		exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+	inc_nlink(dir);
+
+	i_pos = exfat_make_i_pos(&info);
+	inode = exfat_build_inode(sb, &info, i_pos);
+	err = PTR_ERR_OR_ZERO(inode);
+	if (err)
+		goto unlock;
+
+	inode_inc_iversion(inode);
+	inode->i_mtime = inode->i_atime = EXFAT_I(inode)->i_crtime = inode_set_ctime_current(inode);
+	exfat_truncate_atime(&inode->i_atime);
+	/* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+	d_instantiate(dentry, inode);
+
+unlock:
+	mutex_unlock(&EXFAT_SB(sb)->s_lock);
+	return err;
+}
+
+static int exfat_check_dir_empty(struct super_block *sb,
+		struct exfat_chain *p_dir)
+{
+	int i, dentries_per_clu;
+	unsigned int type;
+	struct exfat_chain clu;
+	struct exfat_dentry *ep;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct buffer_head *bh;
+
+	dentries_per_clu = sbi->dentries_per_clu;
+
+	if (p_dir->dir == EXFAT_EOF_CLUSTER)
+		return 0;
+
+	exfat_chain_dup(&clu, p_dir);
+
+	while (clu.dir != EXFAT_EOF_CLUSTER) {
+		for (i = 0; i < dentries_per_clu; i++) {
+			ep = exfat_get_dentry(sb, &clu, i, &bh);
+			if (!ep)
+				return -EIO;
+			type = exfat_get_entry_type(ep);
+			brelse(bh);
+			if (type == TYPE_UNUSED)
+				return 0;
+
+			if (type != TYPE_FILE && type != TYPE_DIR)
+				continue;
+
+			return -ENOTEMPTY;
+		}
+
+		if (clu.flags == ALLOC_NO_FAT_CHAIN) {
+			if (--clu.size > 0)
+				clu.dir++;
+			else
+				clu.dir = EXFAT_EOF_CLUSTER;
+		} else {
+			if (exfat_get_next_cluster(sb, &(clu.dir)))
+				return -EIO;
+		}
+	}
+
+	return 0;
+}
+
+static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	struct exfat_dentry *ep;
+	struct exfat_chain cdir, clu_to_free;
+	struct super_block *sb = inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *ei = EXFAT_I(inode);
+	struct buffer_head *bh;
+	int num_entries, entry, err;
+
+	mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
+
+	exfat_chain_dup(&cdir, &ei->dir);
+	entry = ei->entry;
+
+	if (ei->dir.dir == DIR_DELETED) {
+		exfat_err(sb, "abnormal access to deleted dentry");
+		err = -ENOENT;
+		goto unlock;
+	}
+
+	exfat_chain_set(&clu_to_free, ei->start_clu,
+		EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
+
+	err = exfat_check_dir_empty(sb, &clu_to_free);
+	if (err) {
+		if (err == -EIO)
+			exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
+				  err);
+		goto unlock;
+	}
+
+	ep = exfat_get_dentry(sb, &cdir, entry, &bh);
+	if (!ep) {
+		err = -EIO;
+		goto unlock;
+	}
+
+	num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
+	if (num_entries < 0) {
+		err = -EIO;
+		brelse(bh);
+		goto unlock;
+	}
+	num_entries++;
+	brelse(bh);
+
+	exfat_set_volume_dirty(sb);
+	err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
+	if (err) {
+		exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
+		goto unlock;
+	}
+	ei->dir.dir = DIR_DELETED;
+
+	inode_inc_iversion(dir);
+	dir->i_mtime = dir->i_atime = inode_set_ctime_current(dir);
+	exfat_truncate_atime(&dir->i_atime);
+	if (IS_DIRSYNC(dir))
+		exfat_sync_inode(dir);
+	else
+		mark_inode_dirty(dir);
+	drop_nlink(dir);
+
+	clear_nlink(inode);
+	inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
+	exfat_truncate_atime(&inode->i_atime);
+	exfat_unhash_inode(inode);
+	exfat_d_version_set(dentry, inode_query_iversion(dir));
+unlock:
+	mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
+	return err;
+}
+
+static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
+		int oldentry, struct exfat_uni_name *p_uniname,
+		struct exfat_inode_info *ei)
+{
+	int ret, num_old_entries, num_new_entries;
+	struct exfat_dentry *epold, *epnew;
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *new_bh, *old_bh;
+	int sync = IS_DIRSYNC(inode);
+
+	epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh);
+	if (!epold)
+		return -EIO;
+
+	num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
+	if (num_old_entries < 0)
+		return -EIO;
+	num_old_entries++;
+
+	num_new_entries = exfat_calc_num_entries(p_uniname);
+	if (num_new_entries < 0)
+		return num_new_entries;
+
+	if (num_old_entries < num_new_entries) {
+		int newentry;
+
+		newentry =
+			exfat_find_empty_entry(inode, p_dir, num_new_entries);
+		if (newentry < 0)
+			return newentry; /* -EIO or -ENOSPC */
+
+		epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh);
+		if (!epnew)
+			return -EIO;
+
+		*epnew = *epold;
+		if (exfat_get_entry_type(epnew) == TYPE_FILE) {
+			epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
+			ei->attr |= ATTR_ARCHIVE;
+		}
+		exfat_update_bh(new_bh, sync);
+		brelse(old_bh);
+		brelse(new_bh);
+
+		epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh);
+		if (!epold)
+			return -EIO;
+		epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh);
+		if (!epnew) {
+			brelse(old_bh);
+			return -EIO;
+		}
+
+		*epnew = *epold;
+		exfat_update_bh(new_bh, sync);
+		brelse(old_bh);
+		brelse(new_bh);
+
+		ret = exfat_init_ext_entry(inode, p_dir, newentry,
+			num_new_entries, p_uniname);
+		if (ret)
+			return ret;
+
+		exfat_remove_entries(inode, p_dir, oldentry, 0,
+			num_old_entries);
+		ei->dir = *p_dir;
+		ei->entry = newentry;
+	} else {
+		if (exfat_get_entry_type(epold) == TYPE_FILE) {
+			epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
+			ei->attr |= ATTR_ARCHIVE;
+		}
+		exfat_update_bh(old_bh, sync);
+		brelse(old_bh);
+		ret = exfat_init_ext_entry(inode, p_dir, oldentry,
+			num_new_entries, p_uniname);
+		if (ret)
+			return ret;
+
+		exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
+			num_old_entries);
+	}
+	return 0;
+}
+
+static int 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)
+{
+	int ret, newentry, num_new_entries, num_old_entries;
+	struct exfat_dentry *epmov, *epnew;
+	struct super_block *sb = inode->i_sb;
+	struct buffer_head *mov_bh, *new_bh;
+
+	epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh);
+	if (!epmov)
+		return -EIO;
+
+	num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
+		epmov);
+	if (num_old_entries < 0)
+		return -EIO;
+	num_old_entries++;
+
+	num_new_entries = exfat_calc_num_entries(p_uniname);
+	if (num_new_entries < 0)
+		return num_new_entries;
+
+	newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
+	if (newentry < 0)
+		return newentry; /* -EIO or -ENOSPC */
+
+	epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh);
+	if (!epnew)
+		return -EIO;
+
+	*epnew = *epmov;
+	if (exfat_get_entry_type(epnew) == TYPE_FILE) {
+		epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
+		ei->attr |= ATTR_ARCHIVE;
+	}
+	exfat_update_bh(new_bh, IS_DIRSYNC(inode));
+	brelse(mov_bh);
+	brelse(new_bh);
+
+	epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh);
+	if (!epmov)
+		return -EIO;
+	epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh);
+	if (!epnew) {
+		brelse(mov_bh);
+		return -EIO;
+	}
+
+	*epnew = *epmov;
+	exfat_update_bh(new_bh, IS_DIRSYNC(inode));
+	brelse(mov_bh);
+	brelse(new_bh);
+
+	ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
+		p_uniname);
+	if (ret)
+		return ret;
+
+	exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
+
+	exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
+		p_newdir->flags);
+
+	ei->entry = newentry;
+	return 0;
+}
+
+/* rename or move a old file into a new file */
+static int __exfat_rename(struct inode *old_parent_inode,
+		struct exfat_inode_info *ei, struct inode *new_parent_inode,
+		struct dentry *new_dentry)
+{
+	int ret;
+	int dentry;
+	struct exfat_chain olddir, newdir;
+	struct exfat_chain *p_dir = NULL;
+	struct exfat_uni_name uni_name;
+	struct exfat_dentry *ep;
+	struct super_block *sb = old_parent_inode->i_sb;
+	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	const unsigned char *new_path = new_dentry->d_name.name;
+	struct inode *new_inode = new_dentry->d_inode;
+	int num_entries;
+	struct exfat_inode_info *new_ei = NULL;
+	unsigned int new_entry_type = TYPE_UNUSED;
+	int new_entry = 0;
+	struct buffer_head *new_bh = NULL;
+
+	/* check the validity of pointer parameters */
+	if (new_path == NULL || strlen(new_path) == 0)
+		return -EINVAL;
+
+	if (ei->dir.dir == DIR_DELETED) {
+		exfat_err(sb, "abnormal access to deleted source dentry");
+		return -ENOENT;
+	}
+
+	exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu,
+		EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi),
+		EXFAT_I(old_parent_inode)->flags);
+	dentry = ei->entry;
+
+	/* check whether new dir is existing directory and empty */
+	if (new_inode) {
+		ret = -EIO;
+		new_ei = EXFAT_I(new_inode);
+
+		if (new_ei->dir.dir == DIR_DELETED) {
+			exfat_err(sb, "abnormal access to deleted target dentry");
+			goto out;
+		}
+
+		p_dir = &(new_ei->dir);
+		new_entry = new_ei->entry;
+		ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
+		if (!ep)
+			goto out;
+
+		new_entry_type = exfat_get_entry_type(ep);
+		brelse(new_bh);
+
+		/* if new_inode exists, update ei */
+		if (new_entry_type == TYPE_DIR) {
+			struct exfat_chain new_clu;
+
+			new_clu.dir = new_ei->start_clu;
+			new_clu.size =
+				EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
+				sbi);
+			new_clu.flags = new_ei->flags;
+
+			ret = exfat_check_dir_empty(sb, &new_clu);
+			if (ret)
+				goto out;
+		}
+	}
+
+	/* check the validity of directory name in the given new pathname */
+	ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
+			&uni_name);
+	if (ret)
+		goto out;
+
+	exfat_set_volume_dirty(sb);
+
+	if (olddir.dir == newdir.dir)
+		ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
+				&uni_name, ei);
+	else
+		ret = exfat_move_file(new_parent_inode, &olddir, dentry,
+				&newdir, &uni_name, ei);
+
+	if (!ret && new_inode) {
+		/* delete entries of new_dir */
+		ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
+		if (!ep) {
+			ret = -EIO;
+			goto del_out;
+		}
+
+		num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
+		if (num_entries < 0) {
+			ret = -EIO;
+			goto del_out;
+		}
+		brelse(new_bh);
+
+		if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
+				num_entries + 1)) {
+			ret = -EIO;
+			goto del_out;
+		}
+
+		/* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
+		if (new_entry_type == TYPE_DIR &&
+		    new_ei->start_clu != EXFAT_EOF_CLUSTER) {
+			/* new_ei, new_clu_to_free */
+			struct exfat_chain new_clu_to_free;
+
+			exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
+				EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
+				sbi), new_ei->flags);
+
+			if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
+				/* just set I/O error only */
+				ret = -EIO;
+			}
+
+			i_size_write(new_inode, 0);
+			new_ei->start_clu = EXFAT_EOF_CLUSTER;
+			new_ei->flags = ALLOC_NO_FAT_CHAIN;
+		}
+del_out:
+		/* Update new_inode ei
+		 * Prevent syncing removed new_inode
+		 * (new_ei is already initialized above code ("if (new_inode)")
+		 */
+		new_ei->dir.dir = DIR_DELETED;
+	}
+out:
+	return ret;
+}
+
+static int 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)
+{
+	struct inode *old_inode, *new_inode;
+	struct super_block *sb = old_dir->i_sb;
+	loff_t i_pos;
+	int err;
+
+	/*
+	 * The VFS already checks for existence, so for local filesystems
+	 * the RENAME_NOREPLACE implementation is equivalent to plain rename.
+	 * Don't support any other flags
+	 */
+	if (flags & ~RENAME_NOREPLACE)
+		return -EINVAL;
+
+	mutex_lock(&EXFAT_SB(sb)->s_lock);
+	old_inode = old_dentry->d_inode;
+	new_inode = new_dentry->d_inode;
+
+	err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
+	if (err)
+		goto unlock;
+
+	inode_inc_iversion(new_dir);
+	simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
+	EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
+	exfat_truncate_atime(&new_dir->i_atime);
+	if (IS_DIRSYNC(new_dir))
+		exfat_sync_inode(new_dir);
+	else
+		mark_inode_dirty(new_dir);
+
+	i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
+		(EXFAT_I(old_inode)->entry & 0xffffffff);
+	exfat_unhash_inode(old_inode);
+	exfat_hash_inode(old_inode, i_pos);
+	if (IS_DIRSYNC(new_dir))
+		exfat_sync_inode(old_inode);
+	else
+		mark_inode_dirty(old_inode);
+
+	if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
+		drop_nlink(old_dir);
+		if (!new_inode)
+			inc_nlink(new_dir);
+	}
+
+	inode_inc_iversion(old_dir);
+	if (IS_DIRSYNC(old_dir))
+		exfat_sync_inode(old_dir);
+	else
+		mark_inode_dirty(old_dir);
+
+	if (new_inode) {
+		exfat_unhash_inode(new_inode);
+
+		/* skip drop_nlink if new_inode already has been dropped */
+		if (new_inode->i_nlink) {
+			drop_nlink(new_inode);
+			if (S_ISDIR(new_inode->i_mode))
+				drop_nlink(new_inode);
+		} else {
+			exfat_warn(sb, "abnormal access to an inode dropped");
+			WARN_ON(new_inode->i_nlink == 0);
+		}
+		EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
+	}
+
+unlock:
+	mutex_unlock(&EXFAT_SB(sb)->s_lock);
+	return err;
+}
+
+const struct inode_operations exfat_dir_inode_operations = {
+	.create		= exfat_create,
+	.lookup		= exfat_lookup,
+	.unlink		= exfat_unlink,
+	.mkdir		= exfat_mkdir,
+	.rmdir		= exfat_rmdir,
+	.rename		= exfat_rename,
+	.setattr	= exfat_setattr,
+	.getattr	= exfat_getattr,
+};