1 files changed, 0 insertions, 267 deletions
diff --git a/ANDROID_3.4.5/fs/ramfs/file-nommu.c b/ANDROID_3.4.5/fs/ramfs/file-nommu.c
deleted file mode 100644
index d5378d02..00000000
--- a/ANDROID_3.4.5/fs/ramfs/file-nommu.c
+++ /dev/null
@@ -1,267 +0,0 @@
-/* file-nommu.c: no-MMU version of ramfs
- *
- * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/highmem.h>
-#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/backing-dev.h>
-#include <linux/ramfs.h>
-#include <linux/pagevec.h>
-#include <linux/mman.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-
-#include <asm/uaccess.h>
-#include "internal.h"
-
-static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
-
-const struct address_space_operations ramfs_aops = {
-	.readpage		= simple_readpage,
-	.write_begin		= simple_write_begin,
-	.write_end		= simple_write_end,
-	.set_page_dirty		= __set_page_dirty_no_writeback,
-};
-
-const struct file_operations ramfs_file_operations = {
-	.mmap			= ramfs_nommu_mmap,
-	.get_unmapped_area	= ramfs_nommu_get_unmapped_area,
-	.read			= do_sync_read,
-	.aio_read		= generic_file_aio_read,
-	.write			= do_sync_write,
-	.aio_write		= generic_file_aio_write,
-	.fsync			= noop_fsync,
-	.splice_read		= generic_file_splice_read,
-	.splice_write		= generic_file_splice_write,
-	.llseek			= generic_file_llseek,
-};
-
-const struct inode_operations ramfs_file_inode_operations = {
-	.setattr		= ramfs_nommu_setattr,
-	.getattr		= simple_getattr,
-};
-
-/*****************************************************************************/
-/*
- * add a contiguous set of pages into a ramfs inode when it's truncated from
- * size 0 on the assumption that it's going to be used for an mmap of shared
- * memory
- */
-int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
-{
-	unsigned long npages, xpages, loop;
-	struct page *pages;
-	unsigned order;
-	void *data;
-	int ret;
-
-	/* make various checks */
-	order = get_order(newsize);
-	if (unlikely(order >= MAX_ORDER))
-		return -EFBIG;
-
-	ret = inode_newsize_ok(inode, newsize);
-	if (ret)
-		return ret;
-
-	i_size_write(inode, newsize);
-
-	/* allocate enough contiguous pages to be able to satisfy the
-	 * request */
-	pages = alloc_pages(mapping_gfp_mask(inode->i_mapping), order);
-	if (!pages)
-		return -ENOMEM;
-
-	/* split the high-order page into an array of single pages */
-	xpages = 1UL << order;
-	npages = (newsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
-
-	split_page(pages, order);
-
-	/* trim off any pages we don't actually require */
-	for (loop = npages; loop < xpages; loop++)
-		__free_page(pages + loop);
-
-	/* clear the memory we allocated */
-	newsize = PAGE_SIZE * npages;
-	data = page_address(pages);
-	memset(data, 0, newsize);
-
-	/* attach all the pages to the inode's address space */
-	for (loop = 0; loop < npages; loop++) {
-		struct page *page = pages + loop;
-
-		ret = add_to_page_cache_lru(page, inode->i_mapping, loop,
-					GFP_KERNEL);
-		if (ret < 0)
-			goto add_error;
-
-		/* prevent the page from being discarded on memory pressure */
-		SetPageDirty(page);
-		SetPageUptodate(page);
-
-		unlock_page(page);
-		put_page(page);
-	}
-
-	return 0;
-
-add_error:
-	while (loop < npages)
-		__free_page(pages + loop++);
-	return ret;
-}
-
-/*****************************************************************************/
-/*
- *
- */
-static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
-{
-	int ret;
-
-	/* assume a truncate from zero size is going to be for the purposes of
-	 * shared mmap */
-	if (size == 0) {
-		if (unlikely(newsize >> 32))
-			return -EFBIG;
-
-		return ramfs_nommu_expand_for_mapping(inode, newsize);
-	}
-
-	/* check that a decrease in size doesn't cut off any shared mappings */
-	if (newsize < size) {
-		ret = nommu_shrink_inode_mappings(inode, size, newsize);
-		if (ret < 0)
-			return ret;
-	}
-
-	truncate_setsize(inode, newsize);
-	return 0;
-}
-
-/*****************************************************************************/
-/*
- * handle a change of attributes
- * - we're specifically interested in a change of size
- */
-static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
-{
-	struct inode *inode = dentry->d_inode;
-	unsigned int old_ia_valid = ia->ia_valid;
-	int ret = 0;
-
-	/* POSIX UID/GID verification for setting inode attributes */
-	ret = inode_change_ok(inode, ia);
-	if (ret)
-		return ret;
-
-	/* pick out size-changing events */
-	if (ia->ia_valid & ATTR_SIZE) {
-		loff_t size = inode->i_size;
-
-		if (ia->ia_size != size) {
-			ret = ramfs_nommu_resize(inode, ia->ia_size, size);
-			if (ret < 0 || ia->ia_valid == ATTR_SIZE)
-				goto out;
-		} else {
-			/* we skipped the truncate but must still update
-			 * timestamps
-			 */
-			ia->ia_valid |= ATTR_MTIME|ATTR_CTIME;
-		}
-	}
-
-	setattr_copy(inode, ia);
- out:
-	ia->ia_valid = old_ia_valid;
-	return ret;
-}
-
-/*****************************************************************************/
-/*
- * try to determine where a shared mapping can be made
- * - we require that:
- *   - the pages to be mapped must exist
- *   - the pages be physically contiguous in sequence
- */
-unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
-					    unsigned long addr, unsigned long len,
-					    unsigned long pgoff, unsigned long flags)
-{
-	unsigned long maxpages, lpages, nr, loop, ret;
-	struct inode *inode = file->f_path.dentry->d_inode;
-	struct page **pages = NULL, **ptr, *page;
-	loff_t isize;
-
-	if (!(flags & MAP_SHARED))
-		return addr;
-
-	/* the mapping mustn't extend beyond the EOF */
-	lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	isize = i_size_read(inode);
-
-	ret = -EINVAL;
-	maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	if (pgoff >= maxpages)
-		goto out;
-
-	if (maxpages - pgoff < lpages)
-		goto out;
-
-	/* gang-find the pages */
-	ret = -ENOMEM;
-	pages = kzalloc(lpages * sizeof(struct page *), GFP_KERNEL);
-	if (!pages)
-		goto out_free;
-
-	nr = find_get_pages(inode->i_mapping, pgoff, lpages, pages);
-	if (nr != lpages)
-		goto out_free_pages; /* leave if some pages were missing */
-
-	/* check the pages for physical adjacency */
-	ptr = pages;
-	page = *ptr++;
-	page++;
-	for (loop = lpages; loop > 1; loop--)
-		if (*ptr++ != page++)
-			goto out_free_pages;
-
-	/* okay - all conditions fulfilled */
-	ret = (unsigned long) page_address(pages[0]);
-
-out_free_pages:
-	ptr = pages;
-	for (loop = nr; loop > 0; loop--)
-		put_page(*ptr++);
-out_free:
-	kfree(pages);
-out:
-	return ret;
-}
-
-/*****************************************************************************/
-/*
- * set up a mapping for shared memory segments
- */
-int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	if (!(vma->vm_flags & VM_SHARED))
-		return -ENOSYS;
-
-	file_accessed(file);
-	vma->vm_ops = &generic_file_vm_ops;
-	return 0;
-}