1 files changed, 59 insertions, 0 deletions
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
new file mode 100644
index 000000000..90e00124e
--- /dev/null
+++ b/fs/sysv/file.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/fs/sysv/file.c
+ *
+ *  minix/file.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  coh/file.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/file.c
+ *  Copyright (C) 1993  Bruno Haible
+ *
+ *  SystemV/Coherent regular file handling primitives
+ */
+
+#include "sysv.h"
+
+/*
+ * We have mostly NULLs here: the current defaults are OK for
+ * the coh filesystem.
+ */
+const struct file_operations sysv_file_operations = {
+	.llseek		= generic_file_llseek,
+	.read_iter	= generic_file_read_iter,
+	.write_iter	= generic_file_write_iter,
+	.mmap		= generic_file_mmap,
+	.fsync		= generic_file_fsync,
+	.splice_read	= generic_file_splice_read,
+};
+
+static int sysv_setattr(struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct iattr *attr)
+{
+	struct inode *inode = d_inode(dentry);
+	int error;
+
+	error = setattr_prepare(&init_user_ns, dentry, attr);
+	if (error)
+		return error;
+
+	if ((attr->ia_valid & ATTR_SIZE) &&
+	    attr->ia_size != i_size_read(inode)) {
+		error = inode_newsize_ok(inode, attr->ia_size);
+		if (error)
+			return error;
+		truncate_setsize(inode, attr->ia_size);
+		sysv_truncate(inode);
+	}
+
+	setattr_copy(&init_user_ns, inode, attr);
+	mark_inode_dirty(inode);
+	return 0;
+}
+
+const struct inode_operations sysv_file_inode_operations = {
+	.setattr	= sysv_setattr,
+	.getattr	= sysv_getattr,
+};