diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index b257e6f639f5..e5f12a43cb26 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -672,6 +672,10 @@ static int ext4_d_compare(const struct dentry *dentry, unsigned int len,
 {
 	struct nls_table *charset = EXT4_SB(dentry->d_sb)->encoding;
 
+	if (IS_CASEFOLDED(dentry->d_parent->d_inode))
+		return nls_strncasecmp(charset, str, len, name->name,
+				       name->len);
+
 	return nls_strncmp(charset, str, len, name->name, name->len);
 }
 
@@ -681,16 +685,25 @@ static int ext4_d_hash(const struct dentry *dentry, struct qstr *q)
 	unsigned char *norm;
 	int len, ret = 0;
 
-	/* If normalization is TYPE_PLAIN, we can just reuse the vfs
-	 * hash. */
-	if (IS_NORMALIZATION_TYPE_ALL_PLAIN(charset))
-	    return 0;
+	if (!IS_CASEFOLDED(dentry->d_inode)) {
 
-	norm = kmalloc(PATH_MAX, GFP_ATOMIC);
-	if (!norm)
-		return -ENOMEM;
+		/* If normalization is TYPE_PLAIN, we can just reuse the
+		 * VFS hash. */
+		if (IS_NORMALIZATION_TYPE_ALL_PLAIN(charset))
+			return 0;
+
+		norm = kmalloc(PATH_MAX, GFP_ATOMIC);
+		if (!norm)
+			return -ENOMEM;
+
+		len = nls_normalize(charset, q->name, q->len, norm, PATH_MAX);
+	} else {
+		norm = kmalloc(PATH_MAX, GFP_ATOMIC);
+		if (!norm)
+			return -ENOMEM;
 
-	len = nls_normalize(charset, q->name, q->len, norm, PATH_MAX);
+		len = nls_casefold(charset, q->name, q->len, norm, PATH_MAX);
+	}
 
 	if (len < 0) {
 		ret = -EINVAL;
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 283090eb665a..3106ca356346 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -394,14 +394,15 @@ struct flex_groups {
 #define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 #define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */
+#define EXT4_CASEFOLD_FL		0x00100000 /* Casefolded file */
 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
 #define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
 #define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
 #define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
 
-#define EXT4_FL_USER_VISIBLE		0x304BDFFF /* User visible flags */
-#define EXT4_FL_USER_MODIFIABLE		0x204BC0FF /* User modifiable flags */
+#define EXT4_FL_USER_VISIBLE		0x305BDFFF /* User visible flags */
+#define EXT4_FL_USER_MODIFIABLE		0x205BC0FF /* User modifiable flags */
 
 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
 #define EXT4_FL_XFLAG_VISIBLE		(EXT4_SYNC_FL | \
@@ -416,7 +417,7 @@ struct flex_groups {
 			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
-			   EXT4_PROJINHERIT_FL)
+			   EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
 
 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
diff --git a/fs/ext4/hash.c b/fs/ext4/hash.c
index 1b3c9a492b14..33914ccad165 100644
--- a/fs/ext4/hash.c
+++ b/fs/ext4/hash.c
@@ -282,7 +282,10 @@ int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
 		if (!buff)
 			return -1;
 
-		dlen = nls_normalize(charset, name, len, buff, PATH_MAX);
+		if (!IS_CASEFOLDED(dir))
+			dlen = nls_normalize(charset, name, len, buff, PATH_MAX);
+		else
+			dlen = nls_casefold(charset, name, len, buff, PATH_MAX);
 
 		if (dlen < 0) {
 			kfree(buff);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7d6c10017bdf..fa2edd5f9d22 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4675,9 +4675,11 @@ void ext4_set_inode_flags(struct inode *inode)
 		new_fl |= S_DAX;
 	if (flags & EXT4_ENCRYPT_FL)
 		new_fl |= S_ENCRYPTED;
+	if (flags & EXT4_CASEFOLD_FL)
+		new_fl |= S_CASEFOLD;
 	inode_set_flags(inode, new_fl,
 			S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX|
-			S_ENCRYPTED);
+			S_ENCRYPTED|S_CASEFOLD);
 }
 
 static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index a7074115d6f6..f57e5460cf23 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -210,6 +210,7 @@ static int ext4_ioctl_setflags(struct inode *inode,
 	struct ext4_iloc iloc;
 	unsigned int oldflags, mask, i;
 	unsigned int jflag;
+	struct super_block *sb = inode->i_sb;
 
 	/* Is it quota file? Do not allow user to mess with it */
 	if (ext4_is_quota_file(inode))
@@ -254,6 +255,23 @@ static int ext4_ioctl_setflags(struct inode *inode,
 			goto flags_out;
 	}
 
+	if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
+		if (!ext4_has_feature_ioencoding(sb)) {
+			err = -EOPNOTSUPP;
+			goto flags_out;
+		}
+
+		if (!S_ISDIR(inode->i_mode)) {
+			err = -ENOTDIR;
+			goto flags_out;
+		}
+
+		if (!ext4_empty_dir(inode)) {
+			err = -ENOTEMPTY;
+			goto flags_out;
+		}
+	}
+
 	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 	if (IS_ERR(handle)) {
 		err = PTR_ERR(handle);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 87f3ccec42e2..1651b06ac762 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1277,9 +1277,16 @@ static inline bool ext4_match(const struct inode *parent,
 
 #ifdef CONFIG_NLS
 	if (sbi->encoding) {
-		return !nls_strncmp(sbi->encoding,
-				    de->name, de->name_len,
-				    f.disk_name.name, f.disk_name.len);
+		if (!IS_CASEFOLDED(parent))
+			return !nls_strncmp(sbi->encoding,
+					    de->name, de->name_len,
+					    fname->disk_name.name,
+					    fname->disk_name.len);
+		else
+			return !nls_strncasecmp(sbi->encoding,
+						de->name, de->name_len,
+						fname->disk_name.name,
+						fname->disk_name.len);
 	}
 #endif
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 805bf22898cf..b9770439ed3b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1877,6 +1877,7 @@ struct super_operations {
 #define S_DAX		0	/* Make all the DAX code disappear */
 #endif
 #define S_ENCRYPTED	16384	/* Encrypted file (using fs/crypto/) */
+#define S_CASEFOLD	32768	/* Encrypted file (using fs/crypto/) */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
@@ -1917,6 +1918,7 @@ static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags
 #define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
 #define IS_DAX(inode)		((inode)->i_flags & S_DAX)
 #define IS_ENCRYPTED(inode)	((inode)->i_flags & S_ENCRYPTED)
+#define IS_CASEFOLDED(inode)	((inode)->i_flags & S_CASEFOLD)
 
 #define IS_WHITEOUT(inode)	(S_ISCHR(inode->i_mode) && \
 				 (inode)->i_rdev == WHITEOUT_DEV)
