pramfs: write protection
PATCH 17/19 pramfs: write protection
Add write protection.
Signed-off-by Marco Stornelli <[email protected]>
--- fs/pramfs/wprotect.c | 39 ++++++++++++++ fs/pramfs/wprotect.h | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 183 insertions(+), 0 deletions(-) create mode 100644 fs/pramfs/wprotect.c create mode 100644 fs/pramfs/wprotect.h
fs/pramfs/wprotect.c new file +39 -0
@@ -0,0 +1,39 @@ +/* +* BRIEF DESCRIPTION +* +* Write protection for the filesystem pages. +* +* Copyright 2009-2011 Marco Stornelli <[email protected]> +* Copyright 2003 Sony Corporation +* Copyright 2003 Matsushita Electric Industrial Co., Ltd. +* 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam +* This file is licensed under the terms of the GNU General Public +* License version 2. This program is licensed "as is" without any +* warranty of any kind, whether express or implied. +*/ + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/io.h> +#include "pram.h" + +void pram_writeable (void *vaddr,unsigned long size,int rw) +{ +int ret =0 ; +unsigned long nrpages = size >>PAGE_SHIFT ; +unsigned long addr = (unsigned long )vaddr; + +/* Page aligned */ + addr &=PAGE_MASK ; + +if (size & (PAGE_SIZE -1 )) + nrpages++; + +if (rw) + ret =set_memory_rw (addr, nrpages); +else + ret =set_memory_ro (addr, nrpages); + +BUG_ON (ret); +}
fs/pramfs/wprotect.h new file +144 -0
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Signature · 1 line
1.7.3.4