diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index d82b6f396588..29ee64352807 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -43,6 +43,7 @@ struct shmem_sb_info {
 	spinlock_t shrinklist_lock;   /* Protects shrinklist */
 	struct list_head shrinklist;  /* List of shinkable inodes */
 	unsigned long shrinklist_len; /* Length of shrinklist */
+	bool casefold;              /* If this mount point supports casefolding */
 };
 
 static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
diff --git a/mm/shmem.c b/mm/shmem.c
index b2db4ed0fbc7..20df81763995 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -38,6 +38,7 @@
 #include <linux/hugetlb.h>
 #include <linux/frontswap.h>
 #include <linux/fs_parser.h>
+#include <linux/unicode.h>
 
 #include <asm/tlbflush.h> /* for arch/microblaze update_mmu_cache() */
 
@@ -117,6 +118,8 @@ struct shmem_options {
 	bool full_inums;
 	int huge;
 	int seen;
+	struct unicode_map *encoding;
+	bool cf_strict;
 #define SHMEM_SEEN_BLOCKS 1
 #define SHMEM_SEEN_INODES 2
 #define SHMEM_SEEN_HUGE 4
@@ -161,6 +164,13 @@ static inline struct shmem_sb_info *SHMEM_SB(struct super_block *sb)
 	return sb->s_fs_info;
 }
 
+#ifdef CONFIG_UNICODE
+static const struct dentry_operations casefold_dentry_ops = {
+	.d_hash = generic_ci_d_hash,
+	.d_compare = generic_ci_d_compare,
+};
+#endif
+
 /*
  * shmem_file_setup pre-accounts the whole fixed size of a VM object,
  * for shared memory and for shared anonymous (/dev/zero) mappings
@@ -2859,8 +2869,18 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 	struct inode *inode;
 	int error = -ENOSPC;
 
+#ifdef CONFIG_UNICODE
+	struct super_block *sb = dir->i_sb;
+
+	if (sb_has_strict_encoding(sb) && IS_CASEFOLDED(dir) &&
+	    sb->s_encoding && utf8_validate(sb->s_encoding, &dentry->d_name))
+		return -EINVAL;
+#endif
+
 	inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE);
 	if (inode) {
+		inode->i_flags |= dir->i_flags;
+
 		error = simple_acl_create(dir, inode);
 		if (error)
 			goto out_iput;
@@ -2870,6 +2890,9 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 		if (error && error != -EOPNOTSUPP)
 			goto out_iput;
 
+		if (IS_CASEFOLDED(dir))
+			d_add(dentry, NULL);
+
 		error = 0;
 		dir->i_size += BOGO_DIRENT_SIZE;
 		dir->i_ctime = dir->i_mtime = current_time(dir);
@@ -2925,6 +2948,19 @@ static int shmem_create(struct user_namespace *mnt_userns, struct inode *dir,
 	return shmem_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
 }
 
+static struct dentry *shmem_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+	if (dentry->d_name.len > NAME_MAX)
+		return ERR_PTR(-ENAMETOOLONG);
+
+	if (IS_CASEFOLDED(dir))
+		return NULL;
+
+	d_add(dentry, NULL);
+
+	return NULL;
+}
+
 /*
  * Link a file..
  */
@@ -2946,6 +2982,9 @@ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentr
 			goto out;
 	}
 
+	if (IS_CASEFOLDED(dir))
+		d_add(dentry, NULL);
+
 	dir->i_size += BOGO_DIRENT_SIZE;
 	inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
 	inc_nlink(inode);
@@ -2967,6 +3006,10 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry)
 	inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
 	drop_nlink(inode);
 	dput(dentry);	/* Undo the count from "create" - this does all the work */
+
+	if (IS_CASEFOLDED(dir))
+		d_invalidate(dentry);
+
 	return 0;
 }
 
@@ -3128,6 +3171,8 @@ static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 	}
 	dir->i_size += BOGO_DIRENT_SIZE;
 	dir->i_ctime = dir->i_mtime = current_time(dir);
+	if (IS_CASEFOLDED(dir))
+		d_add(dentry, NULL);
 	d_instantiate(dentry, inode);
 	dget(dentry);
 	return 0;
@@ -3364,6 +3409,8 @@ enum shmem_param {
 	Opt_uid,
 	Opt_inode32,
 	Opt_inode64,
+	Opt_casefold,
+	Opt_cf_strict,
 };
 
 static const struct constant_table shmem_param_enums_huge[] = {
@@ -3385,6 +3432,8 @@ const struct fs_parameter_spec shmem_fs_parameters[] = {
 	fsparam_u32   ("uid",		Opt_uid),
 	fsparam_flag  ("inode32",	Opt_inode32),
 	fsparam_flag  ("inode64",	Opt_inode64),
+	fsparam_string("casefold",	Opt_casefold),
+	fsparam_flag  ("cf_strict",	Opt_cf_strict),
 	{}
 };
 
@@ -3392,9 +3441,11 @@ static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param)
 {
 	struct shmem_options *ctx = fc->fs_private;
 	struct fs_parse_result result;
+	struct unicode_map *encoding;
 	unsigned long long size;
+	char version[10];
 	char *rest;
-	int opt;
+	int opt, ret;
 
 	opt = fs_parse(fc, shmem_fs_parameters, param, &result);
 	if (opt < 0)
@@ -3468,6 +3519,23 @@ static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param)
 		ctx->full_inums = true;
 		ctx->seen |= SHMEM_SEEN_INUMS;
 		break;
+	case Opt_casefold:
+		if (strncmp(param->string, "utf8-", 5))
+			return invalfc(fc, "Only utf8 encondings are supported");
+		ret = strscpy(version, param->string + 5, sizeof(version));
+		if (ret < 0)
+			return invalfc(fc, "Invalid enconding argument: %s", param->string);
+
+		encoding = utf8_load(version);
+		if (IS_ERR(encoding))
+			return invalfc(fc, "Invalid utf8 version: %s", version);
+		pr_info("tmpfs: Using encoding defined by mount options: %s\n",
+			param->string);
+		ctx->encoding = encoding;
+		break;
+	case Opt_cf_strict:
+		ctx->cf_strict = true;
+		break;
 	}
 	return 0;
 
@@ -3646,6 +3714,11 @@ static void shmem_put_super(struct super_block *sb)
 {
 	struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
 
+#ifdef CONFIG_UNICODE
+	if (sbinfo->casefold)
+		utf8_unload(sb->s_encoding);
+#endif
+
 	free_percpu(sbinfo->ino_batch);
 	percpu_counter_destroy(&sbinfo->used_blocks);
 	mpol_put(sbinfo->mpol);
@@ -3686,6 +3759,18 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
 	}
 	sb->s_export_op = &shmem_export_ops;
 	sb->s_flags |= SB_NOSEC;
+
+#ifdef CONFIG_UNICODE
+	if (ctx->encoding) {
+		sb->s_d_op = &casefold_dentry_ops;
+		sb->s_encoding = ctx->encoding;
+		if (ctx->cf_strict)
+			sb->s_encoding_flags = SB_ENC_STRICT_MODE_FL;
+		sbinfo->casefold = true;
+	} else if (ctx->cf_strict) {
+		pr_warn("tmpfs: casefold strict mode enabled without encoding, ignoring\n");
+	}
+#endif /* CONFIG_UNICODE */
 #else
 	sb->s_flags |= SB_NOUSER;
 #endif
@@ -3846,7 +3931,7 @@ static const struct inode_operations shmem_inode_operations = {
 static const struct inode_operations shmem_dir_inode_operations = {
 #ifdef CONFIG_TMPFS
 	.create		= shmem_create,
-	.lookup		= simple_lookup,
+	.lookup		= shmem_lookup,
 	.link		= shmem_link,
 	.unlink		= shmem_unlink,
 	.symlink	= shmem_symlink,
@@ -3912,6 +3997,8 @@ int shmem_init_fs_context(struct fs_context *fc)
 	ctx->mode = 0777 | S_ISVTX;
 	ctx->uid = current_fsuid();
 	ctx->gid = current_fsgid();
+	ctx->encoding = NULL;
+	ctx->cf_strict = false;
 
 	fc->fs_private = ctx;
 	fc->ops = &shmem_fs_context_ops;
