diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 32d0b883e74f..0696671ea070 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3011,6 +3011,39 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
 	return err;
 }
 
+
+static int fuse_file_get_hash(struct file *file, enum hash_algo hash,
+			      uint8_t *buf, size_t size)
+{
+	struct fuse_file *ff = file->private_data;
+	struct fuse_conn *fc = ff->fc;
+	FUSE_ARGS(args);
+	struct fuse_gethash_in inarg;
+	int err = 0;
+
+	if (!fc->allow_gethash)
+		return -EOPNOTSUPP;
+
+	memset(&inarg, 0, sizeof(inarg));
+	inarg.size = size;
+	inarg.hash = hash;
+	args.in.h.opcode = FUSE_GETHASH;
+	args.in.h.nodeid = ff->nodeid;
+	args.in.numargs = 1;
+	args.in.args[0].size = sizeof(inarg);
+	args.in.args[0].value = &inarg;
+	args.out.numargs = 1;
+	args.out.args[0].size = size;
+	args.out.args[0].value = buf;
+
+	err = fuse_simple_request(fc, &args);
+
+	if (err == -ENOSYS)
+		err = -EOPNOTSUPP;
+
+	return err;
+}
+
 static const struct file_operations fuse_file_operations = {
 	.llseek		= fuse_file_llseek,
 	.read_iter	= fuse_file_read_iter,
@@ -3027,6 +3060,7 @@ static const struct file_operations fuse_file_operations = {
 	.compat_ioctl	= fuse_file_compat_ioctl,
 	.poll		= fuse_file_poll,
 	.fallocate	= fuse_file_fallocate,
+	.get_hash	= fuse_file_get_hash,
 };
 
 static const struct file_operations fuse_direct_io_file_operations = {
@@ -3044,6 +3078,7 @@ static const struct file_operations fuse_direct_io_file_operations = {
 	.compat_ioctl	= fuse_file_compat_ioctl,
 	.poll		= fuse_file_poll,
 	.fallocate	= fuse_file_fallocate,
+	.get_hash	= fuse_file_get_hash,
 	/* no splice_read */
 };
 
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index f78e9614bb5f..b4d4736cbb38 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -637,6 +637,13 @@ struct fuse_conn {
 	/** Allow other than the mounter user to access the filesystem ? */
 	unsigned allow_other:1;
 
+	/*
+	 * Allow the underlying filesystem to the hash of a file. This is
+	 * used by IMA to avoid needing to calculate the hash on every
+	 * measurement
+	 */
+	unsigned allow_gethash:1;
+
 	/** The number of requests waiting for completion */
 	atomic_t num_waiting;
 
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index db9e60b7eb69..8051506d245f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -70,6 +70,7 @@ struct fuse_mount_data {
 	unsigned group_id_present:1;
 	unsigned default_permissions:1;
 	unsigned allow_other:1;
+	unsigned allow_gethash:1;
 	unsigned max_read;
 	unsigned blksize;
 };
@@ -454,6 +455,7 @@ enum {
 	OPT_ALLOW_OTHER,
 	OPT_MAX_READ,
 	OPT_BLKSIZE,
+	OPT_ALLOW_GETHASH,
 	OPT_ERR
 };
 
@@ -466,6 +468,7 @@ static const match_table_t tokens = {
 	{OPT_ALLOW_OTHER,		"allow_other"},
 	{OPT_MAX_READ,			"max_read=%u"},
 	{OPT_BLKSIZE,			"blksize=%u"},
+	{OPT_ALLOW_GETHASH,		"allow_gethash"},
 	{OPT_ERR,			NULL}
 };
 
@@ -552,6 +555,10 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev,
 			d->blksize = value;
 			break;
 
+		case OPT_ALLOW_GETHASH:
+			d->allow_gethash = 1;
+			break;
+
 		default:
 			return 0;
 		}
@@ -575,6 +582,8 @@ static int fuse_show_options(struct seq_file *m, struct dentry *root)
 		seq_puts(m, ",default_permissions");
 	if (fc->allow_other)
 		seq_puts(m, ",allow_other");
+	if (fc->allow_gethash)
+		seq_puts(m, ",allow_gethash");
 	if (fc->max_read != ~0)
 		seq_printf(m, ",max_read=%u", fc->max_read);
 	if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
@@ -1141,6 +1150,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 	fc->user_id = d.user_id;
 	fc->group_id = d.group_id;
 	fc->max_read = max_t(unsigned, 4096, d.max_read);
+	fc->allow_gethash = d.allow_gethash;
 
 	/* Used by get_root_inode() */
 	sb->s_fs_info = fc;
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 92fa24c24c92..a43e80ea675d 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -381,6 +381,7 @@ enum fuse_opcode {
 	FUSE_READDIRPLUS   = 44,
 	FUSE_RENAME2       = 45,
 	FUSE_LSEEK         = 46,
+	FUSE_GETHASH       = 47,
 
 	/* CUSE specific operations */
 	CUSE_INIT          = 4096,
@@ -792,4 +793,9 @@ struct fuse_lseek_out {
 	uint64_t	offset;
 };
 
+struct fuse_gethash_in {
+	uint32_t	size;
+	uint32_t	hash;
+};
+
 #endif /* _LINUX_FUSE_H */
