[linux-2.6-block.git] / fs / ramfs / file-mmu.c

/* 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>

#include "internal.h"

const struct file_operations ramfs_file_operations = {
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.mmap		= generic_file_mmap,
	.fsync		= noop_fsync,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.llseek		= generic_file_llseek,
};

const struct inode_operations ramfs_file_inode_operations = {
	.setattr	= simple_setattr,
	.getattr	= simple_getattr,
};
Commit	Line	Data
642fb4d1 DH	1	/* file-mmu.c: ramfs MMU-based file operations
	2	*
	3	* Resizable simple ram filesystem for Linux.
	4	*
	5	* Copyright (C) 2000 Linus Torvalds.
	6	* 2000 Transmeta Corp.
	7	*
	8	* Usage limits added by David Gibson, Linuxcare Australia.
	9	* This file is released under the GPL.
	10	*/
	11
	12	/*
	13	* NOTE! This filesystem is probably most useful
	14	* not as a real filesystem, but as an example of
	15	* how virtual filesystems can be written.
	16	*
	17	* It doesn't get much simpler than this. Consider
	18	* that this file implements the full semantics of
	19	* a POSIX-compliant read-write filesystem.
	20	*
	21	* Note in particular how the filesystem does not
	22	* need to implement any data structures of its own
	23	* to keep track of the virtual data: using the VFS
	24	* caches is sufficient.
	25	*/
	26
642fb4d1	27	#include <linux/fs.h>
131612df	28	#include <linux/mm.h>
4488c59c AB	29	#include <linux/ramfs.h>
	30
	31	#include "internal.h"
642fb4d1	32
4b6f5d20	33	const struct file_operations ramfs_file_operations = {
aad4f8bb	34	.read_iter = generic_file_read_iter,
8174202b	35	.write_iter = generic_file_write_iter,
642fb4d1	36	.mmap = generic_file_mmap,
1b061d92	37	.fsync = noop_fsync,
5ffc4ef4	38	.splice_read = generic_file_splice_read,
8d020765	39	.splice_write = iter_file_splice_write,
642fb4d1 DH	40	.llseek = generic_file_llseek,
	41	};
	42
c5ef1c42	43	const struct inode_operations ramfs_file_inode_operations = {
3322e79a	44	.setattr = simple_setattr,
642fb4d1 DH	45	.getattr = simple_getattr,
642fb4d1 DH	46	};