inode.c

《嵌入式系统设计与实例开发实验教材二源码》Linux内核移植与编译实验

/*
 *  inode.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified for big endian by J.F. Chadima and David S. Miller
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *  Modified 1998 Wolfram Pienkoss for NLS
 *
 */

#include <linux/config.h>
#include <linux/module.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/init.h>

#include <linux/ncp_fs.h>

#include "ncplib_kernel.h"

static void ncp_delete_inode(struct inode *);
static void ncp_put_super(struct super_block *);
static int  ncp_statfs(struct super_block *, struct statfs *);

static struct super_operations ncp_sops =
{
	put_inode:	force_delete,
	delete_inode:	ncp_delete_inode,
	put_super:	ncp_put_super,
	statfs:		ncp_statfs,
};

extern struct dentry_operations ncp_dentry_operations;
#ifdef CONFIG_NCPFS_EXTRAS
extern struct address_space_operations ncp_symlink_aops;
extern int ncp_symlink(struct inode*, struct dentry*, const char*);
#endif

/*
 * Fill in the ncpfs-specific information in the inode.
 */
void ncp_update_inode(struct inode *inode, struct ncp_entry_info *nwinfo)
{
	NCP_FINFO(inode)->DosDirNum = nwinfo->i.DosDirNum;
	NCP_FINFO(inode)->dirEntNum = nwinfo->i.dirEntNum;
	NCP_FINFO(inode)->volNumber = nwinfo->i.volNumber;

#ifdef CONFIG_NCPFS_STRONG
	NCP_FINFO(inode)->nwattr = nwinfo->i.attributes;
#endif
	NCP_FINFO(inode)->access = nwinfo->access;
	NCP_FINFO(inode)->server_file_handle = nwinfo->server_file_handle;
	memcpy(NCP_FINFO(inode)->file_handle, nwinfo->file_handle,
			sizeof(nwinfo->file_handle));
	DPRINTK("ncp_update_inode: updated %s, volnum=%d, dirent=%u\n",
		nwinfo->i.entryName, NCP_FINFO(inode)->volNumber,
		NCP_FINFO(inode)->dirEntNum);
}

void ncp_update_inode2(struct inode* inode, struct ncp_entry_info *nwinfo)
{
	struct nw_info_struct *nwi = &nwinfo->i;
	struct ncp_server *server = NCP_SERVER(inode);

	if (!atomic_read(&NCP_FINFO(inode)->opened)) {
#ifdef CONFIG_NCPFS_STRONG
		NCP_FINFO(inode)->nwattr = nwi->attributes;
#endif
		if (nwi->attributes & aDIR) {
			inode->i_mode = server->m.dir_mode;
			inode->i_size = NCP_BLOCK_SIZE;
		} else {
			inode->i_mode = server->m.file_mode;
			inode->i_size = le32_to_cpu(nwi->dataStreamSize);
#ifdef CONFIG_NCPFS_EXTRAS
			if ((server->m.flags & (NCP_MOUNT_EXTRAS|NCP_MOUNT_SYMLINKS)) && (nwi->attributes & aSHARED)) {
				switch (nwi->attributes & (aHIDDEN|aSYSTEM)) {
					case aHIDDEN:
						if (server->m.flags & NCP_MOUNT_SYMLINKS) {
							if ( /* (inode->i_size >= NCP_MIN_SYMLINK_SIZE)
							 && */ (inode->i_size <= NCP_MAX_SYMLINK_SIZE)) {
								inode->i_mode = (inode->i_mode & ~S_IFMT) | S_IFLNK;
								break;
							}
						}
						/* FALLTHROUGH */
					case 0:
						if (server->m.flags & NCP_MOUNT_EXTRAS)
							inode->i_mode |= 0444;
						break;
					case aSYSTEM:
						if (server->m.flags & NCP_MOUNT_EXTRAS)
							inode->i_mode |= (inode->i_mode >> 2) & 0111;
						break;
					/* case aSYSTEM|aHIDDEN: */
					default:
						/* reserved combination */
						break;
				}
			}
#endif
		}
		if (nwi->attributes & aRONLY) inode->i_mode &= ~0222;
	}
	inode->i_blocks = (inode->i_size + NCP_BLOCK_SIZE - 1) >> NCP_BLOCK_SHIFT;

	inode->i_mtime = ncp_date_dos2unix(le16_to_cpu(nwi->modifyTime),
					   le16_to_cpu(nwi->modifyDate));
	inode->i_ctime = ncp_date_dos2unix(le16_to_cpu(nwi->creationTime),
					   le16_to_cpu(nwi->creationDate));
	inode->i_atime = ncp_date_dos2unix(0, le16_to_cpu(nwi->lastAccessDate));

	NCP_FINFO(inode)->DosDirNum = nwi->DosDirNum;
	NCP_FINFO(inode)->dirEntNum = nwi->dirEntNum;
	NCP_FINFO(inode)->volNumber = nwi->volNumber;
}

/*
 * Fill in the inode based on the ncp_entry_info structure.
 */
static void ncp_set_attr(struct inode *inode, struct ncp_entry_info *nwinfo)
{
	struct nw_info_struct *nwi = &nwinfo->i;
	struct ncp_server *server = NCP_SERVER(inode);

	if (nwi->attributes & aDIR) {
		inode->i_mode = server->m.dir_mode;
		/* for directories dataStreamSize seems to be some
		   Object ID ??? */
		inode->i_size = NCP_BLOCK_SIZE;
	} else {
		inode->i_mode = server->m.file_mode;
		inode->i_size = le32_to_cpu(nwi->dataStreamSize);
#ifdef CONFIG_NCPFS_EXTRAS
		if ((server->m.flags & (NCP_MOUNT_EXTRAS|NCP_MOUNT_SYMLINKS)) 
		 && (nwi->attributes & aSHARED)) {
			switch (nwi->attributes & (aHIDDEN|aSYSTEM)) {
				case aHIDDEN:
					if (server->m.flags & NCP_MOUNT_SYMLINKS) {
						if (/* (inode->i_size >= NCP_MIN_SYMLINK_SIZE)
						 && */ (inode->i_size <= NCP_MAX_SYMLINK_SIZE)) {
							inode->i_mode = (inode->i_mode & ~S_IFMT) | S_IFLNK;
							break;
						}
					}
					/* FALLTHROUGH */
				case 0:
					if (server->m.flags & NCP_MOUNT_EXTRAS)
						inode->i_mode |= 0444;
					break;
				case aSYSTEM:
					if (server->m.flags & NCP_MOUNT_EXTRAS)
						inode->i_mode |= (inode->i_mode >> 2) & 0111;
					break;
				/* case aSYSTEM|aHIDDEN: */
				default:
					/* reserved combination */
					break;
			}
		}
#endif
	}
	if (nwi->attributes & aRONLY) inode->i_mode &= ~0222;

	DDPRINTK("ncp_read_inode: inode->i_mode = %u\n", inode->i_mode);

	inode->i_nlink = 1;
	inode->i_uid = server->m.uid;
	inode->i_gid = server->m.gid;
	inode->i_rdev = 0;
	inode->i_blksize = NCP_BLOCK_SIZE;

	inode->i_blocks = (inode->i_size + NCP_BLOCK_SIZE - 1) >> NCP_BLOCK_SHIFT;

	inode->i_mtime = ncp_date_dos2unix(le16_to_cpu(nwi->modifyTime),
			  		   le16_to_cpu(nwi->modifyDate));
	inode->i_ctime = ncp_date_dos2unix(le16_to_cpu(nwi->creationTime),
			    		   le16_to_cpu(nwi->creationDate));
	inode->i_atime = ncp_date_dos2unix(0,
					   le16_to_cpu(nwi->lastAccessDate));
	ncp_update_inode(inode, nwinfo);
}

static struct inode_operations ncp_symlink_inode_operations = {
	readlink:	page_readlink,
	follow_link:	page_follow_link,
	setattr:	ncp_notify_change,
};

/*
 * Get a new inode.
 */
struct inode * 
ncp_iget(struct super_block *sb, struct ncp_entry_info *info)
{
	struct inode *inode;

	if (info == NULL) {
		printk(KERN_ERR "ncp_iget: info is NULL\n");
		return NULL;
	}

	inode = new_inode(sb);
	if (inode) {
		init_MUTEX(&NCP_FINFO(inode)->open_sem);
		atomic_set(&NCP_FINFO(inode)->opened, info->opened);

		inode->i_ino = info->ino;
		ncp_set_attr(inode, info);
		if (S_ISREG(inode->i_mode)) {
			inode->i_op = &ncp_file_inode_operations;
			inode->i_fop = &ncp_file_operations;
		} else if (S_ISDIR(inode->i_mode)) {
			inode->i_op = &ncp_dir_inode_operations;
			inode->i_fop = &ncp_dir_operations;
#ifdef CONFIG_NCPFS_EXTRAS
		} else if (S_ISLNK(inode->i_mode)) {
			inode->i_op = &ncp_symlink_inode_operations;
			inode->i_data.a_ops = &ncp_symlink_aops;
#endif
		}
		insert_inode_hash(inode);
	} else
		printk(KERN_ERR "ncp_iget: iget failed!\n");
	return inode;
}

static void
ncp_delete_inode(struct inode *inode)
{
	if (S_ISDIR(inode->i_mode)) {
		DDPRINTK("ncp_delete_inode: put directory %ld\n", inode->i_ino);
	}

	if (ncp_make_closed(inode) != 0) {
		/* We can't do anything but complain. */
		printk(KERN_ERR "ncp_delete_inode: could not close\n");
	}
	clear_inode(inode);
}

struct super_block *
ncp_read_super(struct super_block *sb, void *raw_data, int silent)
{
	struct ncp_mount_data_kernel data;
	struct ncp_server *server;
	struct file *ncp_filp;
	struct inode *root_inode;
	struct inode *sock_inode;
	struct socket *sock;
	int error;
	int default_bufsize;
#ifdef CONFIG_NCPFS_PACKET_SIGNING
	int options;
#endif
	struct ncp_entry_info finfo;

	if (raw_data == NULL)
		goto out_no_data;
	switch (*(int*)raw_data) {
		case NCP_MOUNT_VERSION:
			{
				struct ncp_mount_data* md = (struct ncp_mount_data*)raw_data;

				data.flags = md->flags;
				data.int_flags = NCP_IMOUNT_LOGGEDIN_POSSIBLE;
				data.mounted_uid = md->mounted_uid;
				data.wdog_pid = md->wdog_pid;
				data.ncp_fd = md->ncp_fd;
				data.time_out = md->time_out;
				data.retry_count = md->retry_count;
				data.uid = md->uid;
				data.gid = md->gid;
				data.file_mode = md->file_mode;
				data.dir_mode = md->dir_mode;
				memcpy(data.mounted_vol, md->mounted_vol,
					NCP_VOLNAME_LEN+1);
			}
			break;
		case NCP_MOUNT_VERSION_V4:
			{
				struct ncp_mount_data_v4* md = (struct ncp_mount_data_v4*)raw_data;

				data.flags = md->flags;
				data.int_flags = 0;
				data.mounted_uid = md->mounted_uid;
				data.wdog_pid = md->wdog_pid;
				data.ncp_fd = md->ncp_fd;
				data.time_out = md->time_out;
				data.retry_count = md->retry_count;
				data.uid = md->uid;
				data.gid = md->gid;
				data.file_mode = md->file_mode;
				data.dir_mode = md->dir_mode;
				data.mounted_vol[0] = 0;
			}
			break;
		default:
			goto out_bad_mount;
	}
	ncp_filp = fget(data.ncp_fd);
	if (!ncp_filp)
		goto out_bad_file;
	sock_inode = ncp_filp->f_dentry->d_inode;
	if (!S_ISSOCK(sock_inode->i_mode))
		goto out_bad_file2;
	sock = &sock_inode->u.socket_i;
	if (!sock)
		goto out_bad_file2;
		
	if (sock->type == SOCK_STREAM)
		default_bufsize = 61440;
	else
		default_bufsize = 1024;

	sb->s_blocksize = 1024;	/* Eh...  Is this correct? */
	sb->s_blocksize_bits = 10;
	sb->s_magic = NCP_SUPER_MAGIC;
	sb->s_op = &ncp_sops;

	server = NCP_SBP(sb);
	memset(server, 0, sizeof(*server));

	server->ncp_filp = ncp_filp;
/*	server->lock = 0;	*/
	init_MUTEX(&server->sem);
	server->packet = NULL;
/*	server->buffer_size = 0;	*/
/*	server->conn_status = 0;	*/
/*	server->root_dentry = NULL;	*/
/*	server->root_setuped = 0;	*/
#ifdef CONFIG_NCPFS_PACKET_SIGNING
/*	server->sign_wanted = 0;	*/
/*	server->sign_active = 0;	*/
#endif
	server->auth.auth_type = NCP_AUTH_NONE;
/*	server->auth.object_name_len = 0;	*/
/*	server->auth.object_name = NULL;	*/
/*	server->auth.object_type = 0;		*/
/*	server->priv.len = 0;			*/
/*	server->priv.data = NULL;		*/

	server->m = data;
	/* Althought anything producing this is buggy, it happens
	   now because of PATH_MAX changes.. */
	if (server->m.time_out < 1) {
		server->m.time_out = 10;
		printk(KERN_INFO "You need to recompile your ncpfs utils..\n");
	}
	server->m.time_out = server->m.time_out * HZ / 100;
	server->m.file_mode = (server->m.file_mode &
			       (S_IRWXU | S_IRWXG | S_IRWXO)) | S_IFREG;
	server->m.dir_mode = (server->m.dir_mode &