d68772b7c8
Now that efivarfs uses the efivar API, move it out of efivars.c and
into fs/efivarfs where it belongs. This move will eventually allow us
to enable the efivarfs code without having to also enable
CONFIG_EFI_VARS built, and vice versa.
Furthermore, things like,
mount -t efivarfs none /sys/firmware/efi/efivars
will now work if efivarfs is built as a module without requiring the
use of MODULE_ALIAS(), which would have been necessary when the
efivarfs code was part of efivars.c.
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Reviewed-by: Tom Gundersen <teg@jklm.no>
Tested-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
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* Copyright (C) 2012 Red Hat, Inc.
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* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/efi.h>
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#include <linux/fs.h>
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#include "internal.h"
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static int efivarfs_file_open(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static ssize_t efivarfs_file_write(struct file *file,
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const char __user *userbuf, size_t count, loff_t *ppos)
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{
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struct efivar_entry *var = file->private_data;
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void *data;
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u32 attributes;
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struct inode *inode = file->f_mapping->host;
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unsigned long datasize = count - sizeof(attributes);
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ssize_t bytes = 0;
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bool set = false;
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if (count < sizeof(attributes))
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return -EINVAL;
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if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
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return -EFAULT;
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if (attributes & ~(EFI_VARIABLE_MASK))
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return -EINVAL;
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data = kmalloc(datasize, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
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bytes = -EFAULT;
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goto out;
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}
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bytes = efivar_entry_set_get_size(var, attributes, &datasize,
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data, &set);
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if (!set && bytes)
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goto out;
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if (bytes == -ENOENT) {
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drop_nlink(inode);
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d_delete(file->f_dentry);
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dput(file->f_dentry);
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} else {
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mutex_lock(&inode->i_mutex);
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i_size_write(inode, datasize + sizeof(attributes));
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mutex_unlock(&inode->i_mutex);
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}
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bytes = count;
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out:
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kfree(data);
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return bytes;
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}
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static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct efivar_entry *var = file->private_data;
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unsigned long datasize = 0;
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u32 attributes;
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void *data;
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ssize_t size = 0;
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int err;
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err = efivar_entry_size(var, &datasize);
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if (err)
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return err;
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data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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size = efivar_entry_get(var, &attributes, &datasize,
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data + sizeof(attributes));
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if (size)
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goto out_free;
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memcpy(data, &attributes, sizeof(attributes));
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size = simple_read_from_buffer(userbuf, count, ppos,
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data, datasize + sizeof(attributes));
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out_free:
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kfree(data);
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return size;
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}
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const struct file_operations efivarfs_file_operations = {
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.open = efivarfs_file_open,
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.read = efivarfs_file_read,
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.write = efivarfs_file_write,
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.llseek = no_llseek,
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};
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