/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * mount.c - operations for initializing and mounting configfs. * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. * * Based on sysfs: * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel * * configfs Copyright (C) 2005 Oracle. All rights reserved. */ #include <linux/fs.h> #include <linux/module.h> #include <linux/mount.h> #include <linux/pagemap.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/configfs.h> #include "configfs_internal.h" /* Random magic number */ #define CONFIGFS_MAGIC 0x62656570 struct vfsmount * configfs_mount = NULL; struct super_block * configfs_sb = NULL; struct kmem_cache *configfs_dir_cachep; static int configfs_mnt_count = 0; static const struct super_operations configfs_ops = { .statfs = simple_statfs, .drop_inode = generic_delete_inode, }; static struct config_group configfs_root_group = { .cg_item = { .ci_namebuf = "root", .ci_name = configfs_root_group.cg_item.ci_namebuf, }, }; int configfs_is_root(struct config_item *item) { return item == &configfs_root_group.cg_item; } static struct configfs_dirent configfs_root = { .s_sibling = LIST_HEAD_INIT(configfs_root.s_sibling), .s_children = LIST_HEAD_INIT(configfs_root.s_children), .s_element = &configfs_root_group.cg_item, .s_type = CONFIGFS_ROOT, .s_iattr = NULL, }; static int configfs_fill_super(struct super_block *sb, void *data, int silent) { struct inode *inode; struct dentry *root; sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = CONFIGFS_MAGIC; sb->s_op = &configfs_ops; sb->s_time_gran = 1; configfs_sb = sb; inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO, &configfs_root); if (inode) { inode->i_op = &configfs_dir_inode_operations; inode->i_fop = &configfs_dir_operations; /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); } else { pr_debug("configfs: could not get root inode\n"); return -ENOMEM; } root = d_alloc_root(inode); if (!root) { pr_debug("%s: could not get root dentry!\n",__func__); iput(inode); return -ENOMEM; } config_group_init(&configfs_root_group); configfs_root_group.cg_item.ci_dentry = root; root->d_fsdata = &configfs_root; sb->s_root = root; sb->s_d_op = &configfs_dentry_ops; /* the rest get that */ return 0; } static struct dentry *configfs_do_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return mount_single(fs_type, flags, data, configfs_fill_super); } static struct file_system_type configfs_fs_type = { .owner = THIS_MODULE, .name = "configfs", .mount = configfs_do_mount, .kill_sb = kill_litter_super, }; int configfs_pin_fs(void) { return simple_pin_fs(&configfs_fs_type, &configfs_mount, &configfs_mnt_count); } void configfs_release_fs(void) { simple_release_fs(&configfs_mount, &configfs_mnt_count); } static struct kobject *config_kobj; static int __init configfs_init(void) { int err = -ENOMEM; configfs_dir_cachep = kmem_cache_create("configfs_dir_cache", sizeof(struct configfs_dirent), 0, 0, NULL); if (!configfs_dir_cachep) goto out; config_kobj = kobject_create_and_add("config", kernel_kobj); if (!config_kobj) { kmem_cache_destroy(configfs_dir_cachep); configfs_dir_cachep = NULL; goto out; } err = register_filesystem(&configfs_fs_type); if (err) { printk(KERN_ERR "configfs: Unable to register filesystem!\n"); kobject_put(config_kobj); kmem_cache_destroy(configfs_dir_cachep); configfs_dir_cachep = NULL; goto out; } err = configfs_inode_init(); if (err) { unregister_filesystem(&configfs_fs_type); kobject_put(config_kobj); kmem_cache_destroy(configfs_dir_cachep); configfs_dir_cachep = NULL; } out: return err; } static void __exit configfs_exit(void) { unregister_filesystem(&configfs_fs_type); kobject_put(config_kobj); kmem_cache_destroy(configfs_dir_cachep); configfs_dir_cachep = NULL; configfs_inode_exit(); } MODULE_AUTHOR("Oracle"); MODULE_LICENSE("GPL"); MODULE_VERSION("0.0.2"); MODULE_DESCRIPTION("Simple RAM filesystem for user driven kernel subsystem configuration."); module_init(configfs_init); module_exit(configfs_exit);