linux/fs/ramfs/inode.c

/*
 * 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/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/backing-dev.h>
#include <linux/ramfs.h>
#include <linux/sched.h>
#include <linux/parser.h>
#include <linux/magic.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/seq_file.h>
#include "internal.h"

struct ramfs_mount_opts { … };

struct ramfs_fs_info { … };

#define RAMFS_DEFAULT_MODE …

static const struct super_operations ramfs_ops;
static const struct inode_operations ramfs_dir_inode_operations;

struct inode *ramfs_get_inode(struct super_block *sb,
				const struct inode *dir, umode_t mode, dev_t dev)
{ … }

/*
 * File creation. Allocate an inode, and we're done..
 */
/* SMP-safe */
static int
ramfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
	    struct dentry *dentry, umode_t mode, dev_t dev)
{ … }

static int ramfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
		       struct dentry *dentry, umode_t mode)
{ … }

static int ramfs_create(struct mnt_idmap *idmap, struct inode *dir,
			struct dentry *dentry, umode_t mode, bool excl)
{ … }

static int ramfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
			 struct dentry *dentry, const char *symname)
{ … }

static int ramfs_tmpfile(struct mnt_idmap *idmap,
			 struct inode *dir, struct file *file, umode_t mode)
{ … }

static const struct inode_operations ramfs_dir_inode_operations = …;

/*
 * Display the mount options in /proc/mounts.
 */
static int ramfs_show_options(struct seq_file *m, struct dentry *root)
{ … }

static const struct super_operations ramfs_ops = …;

enum ramfs_param { … };

const struct fs_parameter_spec ramfs_fs_parameters[] = …;

static int ramfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{ … }

static int ramfs_fill_super(struct super_block *sb, struct fs_context *fc)
{ … }

static int ramfs_get_tree(struct fs_context *fc)
{ … }

static void ramfs_free_fc(struct fs_context *fc)
{ … }

static const struct fs_context_operations ramfs_context_ops = …;

int ramfs_init_fs_context(struct fs_context *fc)
{ … }

void ramfs_kill_sb(struct super_block *sb)
{ … }

static struct file_system_type ramfs_fs_type = …;

static int __init init_ramfs_fs(void)
{ … }
fs_initcall(init_ramfs_fs);