[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/efivarfs/file.c b/src/kernel/linux/v4.14/fs/efivarfs/file.c
new file mode 100644
index 0000000..5f22e74
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/efivarfs/file.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2012 Red Hat, Inc.
+ * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/efi.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/mount.h>
+
+#include "internal.h"
+
+static ssize_t efivarfs_file_write(struct file *file,
+ const char __user *userbuf, size_t count, loff_t *ppos)
+{
+ struct efivar_entry *var = file->private_data;
+ void *data;
+ u32 attributes;
+ struct inode *inode = file->f_mapping->host;
+ unsigned long datasize = count - sizeof(attributes);
+ ssize_t bytes;
+ bool set = false;
+
+ if (count < sizeof(attributes))
+ return -EINVAL;
+
+ if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
+ return -EFAULT;
+
+ if (attributes & ~(EFI_VARIABLE_MASK))
+ return -EINVAL;
+
+ data = memdup_user(userbuf + sizeof(attributes), datasize);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ bytes = efivar_entry_set_get_size(var, attributes, &datasize,
+ data, &set);
+ if (!set && bytes) {
+ if (bytes == -ENOENT)
+ bytes = -EIO;
+ goto out;
+ }
+
+ if (bytes == -ENOENT) {
+ drop_nlink(inode);
+ d_delete(file->f_path.dentry);
+ dput(file->f_path.dentry);
+ } else {
+ inode_lock(inode);
+ i_size_write(inode, datasize + sizeof(attributes));
+ inode_unlock(inode);
+ }
+
+ bytes = count;
+
+out:
+ kfree(data);
+
+ return bytes;
+}
+
+static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct efivar_entry *var = file->private_data;
+ unsigned long datasize = 0;
+ u32 attributes;
+ void *data;
+ ssize_t size = 0;
+ int err;
+
+ err = efivar_entry_size(var, &datasize);
+
+ /*
+ * efivarfs represents uncommitted variables with
+ * zero-length files. Reading them should return EOF.
+ */
+ if (err == -ENOENT)
+ return 0;
+ else if (err)
+ return err;
+
+ data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
+
+ if (!data)
+ return -ENOMEM;
+
+ size = efivar_entry_get(var, &attributes, &datasize,
+ data + sizeof(attributes));
+ if (size)
+ goto out_free;
+
+ memcpy(data, &attributes, sizeof(attributes));
+ size = simple_read_from_buffer(userbuf, count, ppos,
+ data, datasize + sizeof(attributes));
+out_free:
+ kfree(data);
+
+ return size;
+}
+
+static int
+efivarfs_ioc_getxflags(struct file *file, void __user *arg)
+{
+ struct inode *inode = file->f_mapping->host;
+ unsigned int i_flags;
+ unsigned int flags = 0;
+
+ i_flags = inode->i_flags;
+ if (i_flags & S_IMMUTABLE)
+ flags |= FS_IMMUTABLE_FL;
+
+ if (copy_to_user(arg, &flags, sizeof(flags)))
+ return -EFAULT;
+ return 0;
+}
+
+static int
+efivarfs_ioc_setxflags(struct file *file, void __user *arg)
+{
+ struct inode *inode = file->f_mapping->host;
+ unsigned int flags;
+ unsigned int i_flags = 0;
+ int error;
+
+ if (!inode_owner_or_capable(inode))
+ return -EACCES;
+
+ if (copy_from_user(&flags, arg, sizeof(flags)))
+ return -EFAULT;
+
+ if (flags & ~FS_IMMUTABLE_FL)
+ return -EOPNOTSUPP;
+
+ if (!capable(CAP_LINUX_IMMUTABLE))
+ return -EPERM;
+
+ if (flags & FS_IMMUTABLE_FL)
+ i_flags |= S_IMMUTABLE;
+
+
+ error = mnt_want_write_file(file);
+ if (error)
+ return error;
+
+ inode_lock(inode);
+ inode_set_flags(inode, i_flags, S_IMMUTABLE);
+ inode_unlock(inode);
+
+ mnt_drop_write_file(file);
+
+ return 0;
+}
+
+static long
+efivarfs_file_ioctl(struct file *file, unsigned int cmd, unsigned long p)
+{
+ void __user *arg = (void __user *)p;
+
+ switch (cmd) {
+ case FS_IOC_GETFLAGS:
+ return efivarfs_ioc_getxflags(file, arg);
+ case FS_IOC_SETFLAGS:
+ return efivarfs_ioc_setxflags(file, arg);
+ }
+
+ return -ENOTTY;
+}
+
+const struct file_operations efivarfs_file_operations = {
+ .open = simple_open,
+ .read = efivarfs_file_read,
+ .write = efivarfs_file_write,
+ .llseek = no_llseek,
+ .unlocked_ioctl = efivarfs_file_ioctl,
+};