diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 06096b60f1df..cf73c1712333 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3156,6 +3156,38 @@ static ssize_t fuse_copy_file_range(struct file *file_in, loff_t pos_in,
 
 	inode_unlock(inode_out);
 
+	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;
 }
 
@@ -3177,6 +3209,7 @@ static const struct file_operations fuse_file_operations = {
 	.poll		= fuse_file_poll,
 	.fallocate	= fuse_file_fallocate,
 	.copy_file_range = fuse_copy_file_range,
+	.get_hash	= fuse_file_get_hash,
 };
 
 static const struct address_space_operations fuse_file_aops  = {
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 0920c0c032a0..7e796eaebe38 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -714,6 +714,13 @@ struct fuse_conn {
 	/** Does the filesystem support copy_file_range? */
 	unsigned no_copy_file_range: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 ec5d9953dfb6..845e6c48a6f4 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;
 };
@@ -456,6 +457,7 @@ enum {
 	OPT_ALLOW_OTHER,
 	OPT_MAX_READ,
 	OPT_BLKSIZE,
+	OPT_ALLOW_GETHASH,
 	OPT_ERR
 };
 
@@ -468,6 +470,7 @@ 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}
 };
 
@@ -554,6 +557,15 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev,
 			d->blksize = value;
 			break;
 
+		case OPT_ALLOW_GETHASH:
+			/*
+			 * This is relevant to security decisions made in
+			 * the root namespace, so restrict it more strongly
+			 */
+			if (capable(CAP_SYS_ADMIN))
+				d->allow_gethash = 1;
+			break;
+
 		default:
 			return 0;
 		}
@@ -577,6 +589,8 @@ 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)
@@ -1167,6 +1181,7 @@ 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 2ac598614a8f..31a2dc016a8b 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -399,6 +399,7 @@ enum fuse_opcode {
 	FUSE_RENAME2		= 45,
 	FUSE_LSEEK		= 46,
 	FUSE_COPY_FILE_RANGE	= 47,
+	FUSE_GETHASH		= 48,
 
 	/* CUSE specific operations */
 	CUSE_INIT		= 4096,
@@ -822,4 +823,9 @@ struct fuse_copy_file_range_in {
 	uint64_t	flags;
 };
 
+struct fuse_gethash_in {
+	uint32_t	size;
+	uint32_t	hash;
+};
+
 #endif /* _LINUX_FUSE_H */
