/* file-mmu.c: ramfs MMU-based file operations
 *
 * Resizable simple ram filesystem for Linux.
 *
 * Copyright (C) 2000 Linus Torvalds.
 *               2000 Transmeta Corp.
 *
 * Usage limits added by David Gibson, Linuxcare Australia.
 * This file is released under the GPL.
 */

/*
 * NOTE! This filesystem is probably most useful
 * not as a real filesystem, but as an example of
 * how virtual filesystems can be written.
 *
 * It doesn't get much simpler than this. Consider
 * that this file implements the full semantics of
 * a POSIX-compliant read-write filesystem.
 *
 * Note in particular how the filesystem does not
 * need to implement any data structures of its own
 * to keep track of the virtual data: using the VFS
 * caches is sufficient.
 */

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/ramfs.h>
#ifdef CONFIG_CMA_DEBUG_VERBOSE
#include <linux/migrate.h>
#endif

#include "internal.h"

#ifdef CONFIG_CMA_DEBUG_VERBOSE
int ramfs_migrate_page(struct address_space *mapping,
			struct page *newpage, struct page *page, enum migrate_mode mode)
{
	int rc = fallback_migrate_page(mapping, newpage, page, mode);
	if (rc) {
		pr_err("ramfs_migrate_page: fallback_migrate_page failed with error %d\n", rc);
	}
	return rc;
}
#endif

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,
#ifdef CONFIG_CMA_DEBUG_VERBOSE
	.migratepage	= ramfs_migrate_page,
#endif
};

const struct file_operations ramfs_file_operations = {
	.read		= do_sync_read,
	.aio_read	= generic_file_aio_read,
	.write		= do_sync_write,
	.aio_write	= generic_file_aio_write,
	.mmap		= generic_file_mmap,
	.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	= simple_setattr,
	.getattr	= simple_getattr,
};