patch-2.1.74 linux/fs/ntfs/fs.c

• Lines: 969
• Date: Fri Dec 19 15:24:21 1997
• Orig file: v2.1.73/linux/fs/ntfs/fs.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.73/linux/fs/ntfs/fs.c linux/fs/ntfs/fs.c
@@ -0,0 +1,968 @@
+/*
+ *  fs.c
+ *  NTFS driver for Linux 2.1
+ *
+ *  Copyright (C) 1995-1997 Martin von Löwis
+ *  Copyright (C) 1996 Richard Russon
+ *  Copyright (C) 1996-1997 Régis Duchesne
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifdef NTFS_IN_LINUX_KERNEL
+#include <linux/config.h>
+#endif
+
+#include "types.h"
+#include "struct.h"
+#include "util.h"
+#include "inode.h"
+#include "super.h"
+#include "dir.h"
+#include "support.h"
+#include "macros.h"
+#include "sysctl.h"
+#include <linux/module.h>
+#include <asm/uaccess.h>
+#include <linux/nls.h>
+#include <linux/locks.h>
+#include <linux/init.h>
+
+#define ITEM_SIZE 2040
+
+/* io functions to user space */
+static void ntfs_putuser(ntfs_io* dest,void *src,ntfs_size_t len)
+{
+	copy_to_user(dest->param,src,len);
+	dest->param+=len;
+}
+
+#ifdef CONFIG_NTFS_RW
+static void ntfs_getuser(void *dest,ntfs_io *src,ntfs_size_t len)
+{
+	copy_from_user(dest,src->param,len);
+	src->param+=len;
+}
+#endif
+
+static ssize_t
+ntfs_read(struct file * filp, char *buf, size_t count, loff_t *off)
+{
+	int error;
+	ntfs_io io;
+	ntfs_inode *ino=NTFS_LINO2NINO(filp->f_dentry->d_inode);
+
+	/* inode is not properly initialized */
+	if(!ino)return -EINVAL;
+	ntfs_debug(DEBUG_OTHER, "ntfs_read %x,%x,%x ->",
+		   (unsigned)ino->i_number,(unsigned)*off,(unsigned)count);
+	/* inode has no unnamed data attribute */
+	if(!ntfs_find_attr(ino,ino->vol->at_data,NULL))
+		return -EINVAL;
+	
+	/* read the data */
+	io.fn_put=ntfs_putuser;
+	io.fn_get=0;
+	io.param=buf;
+	io.size=count;
+	error=ntfs_read_attr(ino,ino->vol->at_data,NULL,*off,&io);
+	if(error)return -error;
+	
+	*off+=io.size;
+	return io.size;
+}
+
+#ifdef CONFIG_NTFS_RW
+static ssize_t
+ntfs_write(struct file *filp,const char* buf,size_t count,loff_t *pos)
+{
+	struct super_block* sb;
+	int ret;
+	ntfs_io io;
+	ntfs_inode *ino=NTFS_LINO2NINO(filp->f_dentry->d_inode);
+
+	if(!ino)return -EINVAL;
+	ntfs_debug(DEBUG_OTHER, "ntfs_write %x,%x,%x ->",
+	       (unsigned)ino->i_number,(unsigned)*pos,(unsigned)count);
+	sb = filp->f_dentry->d_inode->i_sb;
+	/* Allows to lock fs ro at any time */
+	if(sb->s_flags & MS_RDONLY)
+		return -ENOSPC;
+	if(!ntfs_find_attr(ino,ino->vol->at_data,NULL))
+		return -EINVAL;
+
+	io.fn_put=0;
+	io.fn_get=ntfs_getuser;
+	io.param=(void*)buf; /* to get rid of the const */
+	io.size=count;
+	ret = ntfs_write_attr(ino,ino->vol->at_data,NULL,*pos,&io);
+	ntfs_debug(DEBUG_OTHER, "%x\n",ret);
+	if(ret<0)return -EINVAL;
+
+	*pos+=ret;
+	return ret;
+}
+#endif
+
+struct ntfs_filldir{
+	struct inode *dir;
+	filldir_t filldir;
+	unsigned int type;
+	ntfs_u32 ph,pl;
+	void *dirent;
+	char *name;
+	int namelen;
+};
+	
+static int ntfs_printcb(ntfs_u8 *entry,void *param)
+{
+	struct ntfs_filldir* nf=param;
+	int flags=NTFS_GETU8(entry+0x51);
+	int show_hidden=0,to_lower=0;
+	int length=NTFS_GETU8(entry+0x50);
+	int inum=NTFS_GETU32(entry);
+	int i,error;
+	switch(nf->type){
+	case ngt_dos:
+		/* Don't display long names */
+		if((flags & 2)==0)
+			return 0;
+		break;
+	case ngt_nt:
+		/* Don't display short-only names */
+		switch(flags&3){
+		case 2: return 0;
+		case 3: to_lower=1;
+		}
+		break;
+	case ngt_posix:
+		break;
+	case ngt_full:
+		show_hidden=1;
+		break;
+	}
+	if(!show_hidden && ((NTFS_GETU8(entry+0x48) & 2)==2)){
+		ntfs_debug(DEBUG_OTHER,"Skipping hidden file\n");
+		return 0;
+	}
+	nf->name=0;
+	if(ntfs_encodeuni(NTFS_INO2VOL(nf->dir),(ntfs_u16*)(entry+0x52),
+			  length,&nf->name,&nf->namelen)){
+		ntfs_debug(DEBUG_OTHER,"Skipping unrepresentable file\n");
+		if(nf->name)ntfs_free(nf->name);
+		return 0;
+	}
+	/* Do not return ".", as this is faked */
+	if(length==1 && *nf->name=='.')
+		return 0;
+	if(to_lower)
+		for(i=0;i<nf->namelen;i++)
+			/* This supports ASCII only. Since only DOS-only
+			   names get converted, and since those are restricted
+			   to ASCII, this should be correct */
+			if(nf->name[i]>='A' && nf->name[i]<='Z')
+				nf->name[i]+='a'-'A';
+	nf->name[nf->namelen]=0;
+	ntfs_debug(DEBUG_OTHER, "readdir got %s,len %d\n",nf->name,nf->namelen);
+	/* filldir expects an off_t rather than an loff_t.
+	   Hope we don't have more than 65535 index records */
+	error=nf->filldir(nf->dirent,nf->name,nf->namelen,
+			(nf->ph<<16)|nf->pl,inum);
+	ntfs_free(nf->name);
+	/* Linux filldir errors are negative, other errors positive */
+	return error;
+}
+
+/* readdir returns '..', then '.', then the directory entries in sequence
+   As the root directory contains a entry for itself, '.' is not emulated
+   for the root directory */
+static int ntfs_readdir(struct file* filp, void *dirent, filldir_t filldir)
+{
+	struct ntfs_filldir cb;
+	int error;
+	struct inode *dir=filp->f_dentry->d_inode;
+
+	ntfs_debug(DEBUG_OTHER, "ntfs_readdir ino %x mode %x\n",
+	       (unsigned)dir->i_ino,(unsigned int)dir->i_mode);
+	if(!dir || (dir->i_ino==0) || !S_ISDIR(dir->i_mode))return -EBADF;
+
+	ntfs_debug(DEBUG_OTHER, "readdir: Looking for file %x dircount %d\n",
+	       (unsigned)filp->f_pos,dir->i_count);
+	cb.pl=filp->f_pos & 0xFFFF;
+	cb.ph=filp->f_pos >> 16;
+	/* end of directory */
+	if(cb.ph==0xFFFF){
+		/* FIXME: Maybe we can return those with the previous call */
+		switch(cb.pl){
+		case 0: filldir(dirent,".",1,filp->f_pos,dir->i_ino);
+			filp->f_pos=0xFFFF0001;
+			return 0;
+			/* FIXME: parent directory */
+		case 1: filldir(dirent,"..",2,filp->f_pos,0);
+			filp->f_pos=0xFFFF0002;
+			return 0;
+		}
+		ntfs_debug(DEBUG_OTHER, "readdir: EOD\n");
+		return 0;
+	}
+	cb.dir=dir;
+	cb.filldir=filldir;
+	cb.dirent=dirent;
+	cb.type=NTFS_INO2VOL(dir)->ngt;
+	do{
+		ntfs_debug(DEBUG_OTHER,"looking for next file\n");
+		error=ntfs_getdir_unsorted(NTFS_LINO2NINO(dir),&cb.ph,&cb.pl,
+				   ntfs_printcb,&cb);
+	}while(!error && cb.ph!=0xFFFFFFFF);
+	filp->f_pos=(cb.ph<<16)|cb.pl;
+	ntfs_debug(DEBUG_OTHER, "new position %x\n",(unsigned)filp->f_pos);
+        /* -EINVAL is on user buffer full. This is not considered 
+	   as an error by sys_getdents */
+	if(error<0) 
+		error=0;
+	/* Otherwise (device error, inconsistent data), switch the sign */
+	return -error;
+}
+
+/* Copied from vfat driver */
+static int simple_getbool(char *s, int *setval)
+{
+	if (s) {
+		if (!strcmp(s,"1") || !strcmp(s,"yes") || !strcmp(s,"true")) {
+			*setval = 1;
+		} else if (!strcmp(s,"0") || !strcmp(s,"no") || !strcmp(s,"false")) {
+			*setval = 0;
+		} else {
+			return 0;
+		}
+	} else {
+		*setval = 1;
+	}
+	return 1;
+}
+
+/* Parse the (re)mount options */
+static int parse_options(ntfs_volume* vol,char *opt)
+{
+	char *value;
+
+	vol->uid=vol->gid=0;
+	vol->umask=0077;
+	vol->ngt=ngt_nt;
+	vol->nls_map=0;
+	vol->nct=0;
+	if(!opt)goto done;
+
+	for(opt = strtok(opt,",");opt;opt=strtok(NULL,","))
+	{
+		if ((value = strchr(opt, '=')) != NULL)
+			*value++='\0';
+		if(strcmp(opt,"uid")==0)
+		{
+			if(!value || !*value)goto needs_arg;
+			vol->uid=simple_strtoul(value,&value,0);
+			if(*value){
+				printk(KERN_ERR "NTFS: uid invalid argument\n");
+				return 0;
+			}
+		}else if(strcmp(opt, "gid") == 0)
+		{
+			if(!value || !*value)goto needs_arg;
+			vol->gid=simple_strtoul(value,&value,0);
+			if(*value){
+				printk(KERN_ERR "gid invalid argument\n");
+				return 0;
+			}
+		}else if(strcmp(opt, "umask") == 0)
+		{
+			if(!value || !*value)goto needs_arg;
+			vol->umask=simple_strtoul(value,&value,0);
+			if(*value){
+				printk(KERN_ERR "umask invalid argument\n");
+				return 0;
+			}
+		}else if(strcmp(opt, "iocharset") == 0){
+			if(!value || !*value)goto needs_arg;
+			vol->nls_map=load_nls(value);
+			vol->nct |= nct_map;
+			if(!vol->nls_map){
+				printk(KERN_ERR "NTFS: charset not found");
+				return 0;
+			}
+		}else if(strcmp(opt, "posix") == 0){
+			int val;
+			if(!value || !*value)goto needs_arg;
+			if(!simple_getbool(value,&val))
+				goto needs_bool;
+			vol->ngt=val?ngt_posix:ngt_nt;
+		}else if(strcmp(opt,"utf8") == 0){
+			int val=0;
+			if(!value || !*value)
+				val=1;
+			else if(!simple_getbool(value,&val))
+				goto needs_bool;
+			if(val)
+				vol->nct|=nct_utf8;
+		}else if(strcmp(opt,"uni_xlate") == 0){
+			int val=0;
+			/* no argument: uni_vfat.
+			   boolean argument: uni_vfat.
+			   "2": uni.
+			*/
+			if(!value || !*value)
+				val=1;
+			else if(strcmp(value,"2")==0)
+				vol->nct |= nct_uni_xlate;
+			else if(!simple_getbool(value,&val))
+				goto needs_bool;
+			if(val)
+				vol->nct |= nct_uni_xlate_vfat | nct_uni_xlate;
+		}else{
+			printk(KERN_ERR "NTFS: unkown option '%s'\n", opt);
+			return 0;
+		}
+	}
+	if(vol->nct & nct_utf8 & (nct_map | nct_uni_xlate)){
+		printk(KERN_ERR "utf8 cannot be combined with iocharset or uni_xlate\n");
+		return 0;
+	}
+ done:
+	if((vol->nct & (nct_uni_xlate | nct_map | nct_utf8))==0)
+		/* default to UTF-8 */
+		vol->nct=nct_utf8;
+	if(!vol->nls_map)
+		vol->nls_map=load_nls_default();
+	return 1;
+
+ needs_arg:
+	printk(KERN_ERR "NTFS: %s needs an argument",opt);
+	return 0;
+ needs_bool:
+	printk(KERN_ERR "NTFS: %s needs boolean argument",opt);
+	return 0;
+}
+			
+static int ntfs_lookup(struct inode *dir, struct dentry *d)
+{
+	struct inode *res=0;
+	char *item=0;
+	ntfs_iterate_s walk;
+	int error;
+	ntfs_debug(DEBUG_OTHER, "Looking up %s in %x\n",d->d_name.name,
+		   (unsigned)dir->i_ino);
+	/* convert to wide string */
+	error=ntfs_decodeuni(NTFS_INO2VOL(dir),(char*)d->d_name.name,
+			     d->d_name.len,&walk.name,&walk.namelen);
+	if(error)
+		return error;
+	item=ntfs_malloc(ITEM_SIZE);
+	/* ntfs_getdir will place the directory entry into item,
+	   and the first long long is the MFT record number */
+	walk.type=BY_NAME;
+	walk.dir=NTFS_LINO2NINO(dir);
+	walk.result=item;
+	if(ntfs_getdir_byname(&walk))
+	{
+		res=iget(dir->i_sb,NTFS_GETU32(item));
+	}
+	d_add(d,res);
+	ntfs_free(item);
+	ntfs_free(walk.name);
+	return res?0:-ENOENT;
+}
+
+struct file_operations ntfs_file_operations_nommap = {
+	NULL, /* lseek */
+	ntfs_read,
+#ifdef CONFIG_NTFS_RW
+	ntfs_write,
+#else
+	NULL,
+#endif
+	NULL, /* readdir */
+	NULL, /* select */
+	NULL, /* ioctl */
+	NULL, /* mmap */
+	NULL, /* open */
+	NULL, /* release */
+	NULL, /* fsync */
+	NULL, /* fasync */
+	NULL, /* check_media_change */
+	NULL, /* revalidate */
+	NULL, /* lock */
+};
+
+struct inode_operations ntfs_inode_operations_nobmap = {
+	&ntfs_file_operations_nommap,
+	NULL, /* create */
+	NULL, /* lookup */
+	NULL, /* link */
+	NULL, /* unlink */
+	NULL, /* symlink */
+	NULL, /* mkdir */
+	NULL, /* rmdir */
+	NULL, /* mknod */
+	NULL, /* rename */
+	NULL, /* readlink */
+	NULL, /* follow_link */
+	NULL, /* readpage */
+	NULL, /* writepage */
+	NULL, /* bmap */
+	NULL, /* truncate */
+	NULL, /* permission */
+	NULL, /* smap */
+	NULL, /* updatepage */
+	NULL, /* revalidate */
+};
+
+#ifdef CONFIG_NTFS_RW
+static int
+ntfs_create(struct inode* dir,struct dentry *d,int mode)
+{
+	struct inode *r=0;
+	ntfs_inode *ino=0;
+	ntfs_volume *vol;
+	int error=0;
+	ntfs_attribute *si;
+
+	r=get_empty_inode();
+	if(!r){
+		error=ENOMEM;
+		goto fail;
+	}
+
+	ntfs_debug(DEBUG_OTHER, "ntfs_create %s\n",d->d_name.name);
+	vol=NTFS_INO2VOL(dir);
+#ifdef NTFS_IN_LINUX_KERNEL
+	ino=NTFS_LINO2NINO(r);
+#else
+	ino=ntfs_malloc(sizeof(ntfs_inode));
+	if(!ino){
+		error=ENOMEM;
+		goto fail;
+	}
+	r->u.generic_ip=ino;
+#endif
+	error=ntfs_alloc_inode(NTFS_LINO2NINO(dir),ino,(char*)d->d_name.name,
+			       d->d_name.len);
+	if(error)goto fail;
+	error=ntfs_update_inode(ino);
+	if(error)goto fail;
+	error=ntfs_update_inode(NTFS_LINO2NINO(dir));
+	if(error)goto fail;
+
+	r->i_uid=vol->uid;
+	r->i_gid=vol->gid;
+	r->i_nlink=1;
+	r->i_sb=dir->i_sb;
+	/* FIXME: dirty? dev? */
+	/* get the file modification times from the standard information */
+	si=ntfs_find_attr(ino,vol->at_standard_information,NULL);
+	if(si){
+		char *attr=si->d.data;
+		r->i_atime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+0x18));
+		r->i_ctime=ntfs_ntutc2unixutc(NTFS_GETU64(attr));
+		r->i_mtime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+8));
+	}
+	/* It's not a directory */
+	r->i_op=&ntfs_inode_operations_nobmap;
+	r->i_mode=S_IFREG|S_IRUGO;
+	r->i_mode &= ~vol->umask;
+
+	d_instantiate(d,r);
+	return 0;
+ fail:
+	#ifndef NTFS_IN_LINUX_KERNEL
+	if(ino)ntfs_free(ino);
+	#endif
+	if(r)iput(r);
+	return -error;
+}
+#endif
+
+static int 
+ntfs_bmap(struct inode *ino,int block)
+{
+	int ret=ntfs_vcn_to_lcn(NTFS_LINO2NINO(ino),block);
+	ntfs_debug(DEBUG_OTHER, "bmap of %lx,block %x is %x\n",
+	       ino->i_ino,block,ret);
+	return (ret==-1) ? 0:ret;
+}
+
+struct file_operations ntfs_file_operations = {
+	NULL, /* lseek */
+	ntfs_read,
+#ifdef CONFIG_NTFS_RW
+	ntfs_write,
+#else
+	NULL,
+#endif
+	NULL, /* readdir */
+	NULL, /* select */
+	NULL, /* ioctl */
+	generic_file_mmap,
+	NULL, /* open */
+	NULL, /* release */
+	NULL, /* fsync */
+	NULL, /* fasync */
+	NULL, /* check_media_change */
+	NULL, /* revalidate */
+	NULL, /* lock */
+};
+
+struct inode_operations ntfs_inode_operations = {
+	&ntfs_file_operations,
+	NULL, /* create */
+	NULL, /* lookup */
+	NULL, /* link */
+	NULL, /* unlink */
+	NULL, /* symlink */
+	NULL, /* mkdir */
+	NULL, /* rmdir */
+	NULL, /* mknod */
+	NULL, /* rename */
+	NULL, /* readlink */
+	NULL, /* follow_link */
+	generic_readpage,
+	NULL, /* writepage */
+	ntfs_bmap,
+	NULL, /* truncate */
+	NULL, /* permission */
+	NULL, /* smap */
+	NULL, /* updatepage */
+	NULL, /* revalidate */
+};
+
+struct file_operations ntfs_dir_operations = {
+	NULL, /* lseek */
+	NULL, /* read */
+	NULL, /* write */
+	ntfs_readdir, /* readdir */
+	NULL, /* poll */
+	NULL, /* ioctl */
+	NULL, /* mmap */
+	NULL, /* open */
+	NULL, /* release */
+	NULL, /* fsync */
+	NULL, /* fasync */
+	NULL, /* check_media_change */
+	NULL, /* revalidate */
+	NULL, /* lock */
+};
+
+struct inode_operations ntfs_dir_inode_operations = {
+	&ntfs_dir_operations,
+#ifdef CONFIG_NTFS_RW
+	ntfs_create, /* create */
+#else
+	NULL,
+#endif
+	ntfs_lookup, /* lookup */
+	NULL, /* link */
+	NULL, /* unlink */
+	NULL, /* symlink */
+	NULL, /* mkdir */
+	NULL, /* rmdir */
+	NULL, /* mknod */
+	NULL, /* rename */
+	NULL, /* readlink */
+	NULL, /* follow_link */
+	NULL, /* readpage */
+	NULL, /* writepage */
+	NULL, /* bmap */
+	NULL, /* truncate */
+	NULL, /* permission */
+	NULL, /* smap */
+	NULL, /* updatepage */
+	NULL, /* revalidate */
+};
+
+/* ntfs_read_inode is called by the Virtual File System (the kernel layer that
+ * deals with filesystems) when iget is called requesting an inode not already
+ * present in the inode table. Typically filesystems have separate
+ * inode_operations for directories, files and symlinks.
+ */
+static void ntfs_read_inode(struct inode* inode)
+{
+	ntfs_volume *vol;
+	int can_mmap=0;
+	ntfs_inode *ino;
+	ntfs_attribute *data;
+	ntfs_attribute *si;
+
+	vol=NTFS_INO2VOL(inode);
+	inode->i_op=NULL;
+	inode->i_mode=0;
+	ntfs_debug(DEBUG_OTHER, "ntfs_read_inode %x\n",(unsigned)inode->i_ino);
+
+	switch(inode->i_ino)
+	{
+		/* those are loaded special files */
+	case FILE_MFT:
+		ntfs_error("Trying to open MFT\n");return;
+	default:
+		#ifdef NTFS_IN_LINUX_KERNEL
+		ino=&inode->u.ntfs_i;
+		#else
+		ino=(ntfs_inode*)ntfs_malloc(sizeof(ntfs_inode));
+		inode->u.generic_ip=ino;
+		#endif
+		if(!ino || ntfs_init_inode(ino,
+					   NTFS_INO2VOL(inode),inode->i_ino))
+		{
+			ntfs_debug(DEBUG_OTHER, "NTFS:Error loading inode %x\n",
+			       (unsigned int)inode->i_ino);
+			return;
+		}
+	}
+	/* Set uid/gid from mount options */
+	inode->i_uid=vol->uid;
+	inode->i_gid=vol->gid;
+	inode->i_nlink=1;
+	/* Use the size of the data attribute as file size */
+	data = ntfs_find_attr(ino,vol->at_data,NULL);
+	if(!data)
+	{
+		inode->i_size=0;
+		can_mmap=0;
+	}
+	else
+	{
+		inode->i_size=data->size;
+		can_mmap=!data->resident && !data->compressed;
+	}
+	/* get the file modification times from the standard information */
+	si=ntfs_find_attr(ino,vol->at_standard_information,NULL);
+	if(si){
+		char *attr=si->d.data;
+		inode->i_atime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+0x18));
+		inode->i_ctime=ntfs_ntutc2unixutc(NTFS_GETU64(attr));
+		inode->i_mtime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+8));
+	}
+	/* if it has an index root, it's a directory */
+	if(ntfs_find_attr(ino,vol->at_index_root,"$I30"))
+	{
+		ntfs_attribute *at;
+		at = ntfs_find_attr (ino, vol->at_index_allocation, "$I30");
+		inode->i_size = at ? at->size : 0;
+	  
+		inode->i_op=&ntfs_dir_inode_operations;
+		inode->i_mode=S_IFDIR|S_IRUGO|S_IXUGO;
+	}
+	else
+	{
+		inode->i_op=can_mmap ? &ntfs_inode_operations : 
+			&ntfs_inode_operations_nobmap;
+		inode->i_mode=S_IFREG|S_IRUGO|S_IMMUTABLE;
+		inode->i_mode=S_IFREG|S_IRUGO;
+	}
+	inode->i_mode &= ~vol->umask;
+}
+
+static void ntfs_put_inode(struct inode *ino)
+{
+	ntfs_debug(DEBUG_OTHER, "ntfs_put_inode %lx\n",ino->i_ino);
+#ifdef NTFS_IN_LINUX_KERNEL
+	if(ino->i_ino!=FILE_MFT)
+		ntfs_clear_inode(&ino->u.ntfs_i);
+#else
+	if(ino->i_ino!=FILE_MFT && ino->u.generic_ip)
+	{
+		ntfs_clear_inode(ino->u.generic_ip);
+		ntfs_free(ino->u.generic_ip);
+		ino->u.generic_ip=0;
+	}
+#endif
+	clear_inode(ino);
+}
+
+/* Called when umounting a filesystem by do_umount() in fs/super.c */
+static void ntfs_put_super(struct super_block *sb)
+{
+	ntfs_volume *vol;
+
+	ntfs_debug(DEBUG_OTHER, "ntfs_put_super\n");
+	/* Ensure that nobody uses the super block anymore */
+	lock_super(sb);
+	vol=NTFS_SB2VOL(sb);
+	/* Tell the kernel that the super block is no more used */
+	sb->s_dev = 0;
+	unlock_super(sb);
+	ntfs_release_volume(vol);
+	if(vol->nls_map)
+		unload_nls(vol->nls_map);
+#ifndef NTFS_IN_LINUX_KERNEL
+	ntfs_free(vol);
+#endif
+	ntfs_debug(DEBUG_OTHER, "ntfs_put_super: done\n");
+	MOD_DEC_USE_COUNT;
+}
+
+/* Called by the kernel when asking for stats */
+static int ntfs_statfs(struct super_block *sb, struct statfs *sf, int bufsize)
+{
+	struct statfs fs;
+	struct inode *mft;
+	ntfs_volume *vol;
+
+	ntfs_debug(DEBUG_OTHER, "ntfs_statfs\n");
+	vol=NTFS_SB2VOL(sb);
+	memset(&fs,0,sizeof(fs));
+	fs.f_type=NTFS_SUPER_MAGIC;
+	fs.f_bsize=vol->clustersize;
+
+	fs.f_blocks=ntfs_get_volumesize(NTFS_SB2VOL(sb));
+	fs.f_bfree=ntfs_get_free_cluster_count(vol->bitmap);
+	fs.f_bavail=fs.f_bfree;
+
+	/* Number of files is limited by free space only, so we lie here */
+	fs.f_ffree=0;
+	mft=iget(sb,FILE_MFT);
+	fs.f_files=mft->i_size/vol->mft_recordsize;
+	iput(mft);
+
+	/* should be read from volume */
+	fs.f_namelen=255;
+	copy_to_user(sf,&fs,bufsize);
+	return 0;
+}
+
+/* Called when remounting a filesystem by do_remount_sb() in fs/super.c */
+static int ntfs_remount_fs(struct super_block *sb, int *flags, char *options)
+{
+	if(!parse_options(NTFS_SB2VOL(sb), options))
+		return -EINVAL;
+	return 0;
+}
+
+/* Define the super block operation that are implemented */
+struct super_operations ntfs_super_operations = {
+	ntfs_read_inode,
+	NULL, /* write_inode */
+	ntfs_put_inode,
+	NULL, /* delete_inode */
+	NULL, /* notify_change */
+	ntfs_put_super,
+	NULL, /* write_super */
+	ntfs_statfs,
+	ntfs_remount_fs, /* remount */
+};
+
+/* Called to mount a filesystem by read_super() in fs/super.c
+ * Return a super block, the main structure of a filesystem
+ *
+ * NOTE : Don't store a pointer to an option, as the page containing the
+ * options is freed after ntfs_read_super() returns.
+ *
+ * NOTE : A context switch can happen in kernel code only if the code blocks
+ * (= calls schedule() in kernel/sched.c).
+ */
+struct super_block * ntfs_read_super(struct super_block *sb, 
+				     void *options, int silent)
+{
+	ntfs_volume *vol;
+	struct buffer_head *bh;
+	int i;
+
+	/* When the driver is compiled as a module, kerneld must know when it
+	 * can safely remove it from memory. To do this, each module owns a
+	 * reference counter.
+	 */
+	MOD_INC_USE_COUNT;
+	/* Don't put ntfs_debug() before MOD_INC_USE_COUNT, printk() can block
+	 * so this could lead to a race condition with kerneld.
+	 */
+	ntfs_debug(DEBUG_OTHER, "ntfs_read_super\n");
+
+#ifdef NTFS_IN_LINUX_KERNEL
+	vol = NTFS_SB2VOL(sb);
+#else
+	if(!(vol = ntfs_malloc(sizeof(ntfs_volume))))
+		goto ntfs_read_super_dec;
+	NTFS_SB2VOL(sb)=vol;
+#endif
+	
+	if(!parse_options(vol,(char*)options))
+		goto ntfs_read_super_vol;
+
+	/* Ensure that the super block won't be used until it is completed */
+	lock_super(sb);
+	ntfs_debug(DEBUG_OTHER, "lock_super\n");
+#if 0
+	/* Set to read only, user option might reset it */
+	sb->s_flags |= MS_RDONLY;
+#endif
+
+	/* Assume a 512 bytes block device for now */
+	set_blocksize(sb->s_dev, 512);
+	/* Read the super block (boot block) */
+	if(!(bh=bread(sb->s_dev,0,512))) {
+		ntfs_error("Reading super block failed\n");
+		goto ntfs_read_super_unl;
+	}
+	ntfs_debug(DEBUG_OTHER, "Done reading boot block\n");
+
+	/* Check for 'NTFS' magic number */
+	if(!IS_NTFS_VOLUME(bh->b_data)){
+		ntfs_debug(DEBUG_OTHER, "Not a NTFS volume\n");
+		brelse(bh);
+		goto ntfs_read_super_unl;
+	}
+
+	ntfs_debug(DEBUG_OTHER, "Going to init volume\n");
+	ntfs_init_volume(vol,bh->b_data);
+	ntfs_debug(DEBUG_OTHER, "MFT record at cluster 0x%X\n",vol->mft_cluster);
+	brelse(bh);
+	NTFS_SB(vol)=sb;
+	ntfs_debug(DEBUG_OTHER, "Done to init volume\n");
+
+	/* Inform the kernel that a device block is a NTFS cluster */
+	sb->s_blocksize=vol->clustersize;
+	for(i=sb->s_blocksize,sb->s_blocksize_bits=0;i;i>>=1)
+		sb->s_blocksize_bits++;
+	set_blocksize(sb->s_dev,sb->s_blocksize);
+	ntfs_debug(DEBUG_OTHER, "set_blocksize\n");
+
+	/* Allocate a MFT record (MFT record can be smaller than a cluster) */
+	if(!(vol->mft=ntfs_malloc(max(vol->mft_recordsize,vol->clustersize))))
+		goto ntfs_read_super_unl;
+
+	/* Read at least the MFT record for $MFT */
+	for(i=0;i<max(vol->mft_clusters_per_record,1);i++){
+		if(!(bh=bread(sb->s_dev,vol->mft_cluster+i,vol->clustersize))) {
+			ntfs_error("Could not read MFT record 0\n");
+			goto ntfs_read_super_mft;
+		}
+		ntfs_memcpy(vol->mft+i*vol->clustersize,bh->b_data,vol->clustersize);
+		brelse(bh);
+		ntfs_debug(DEBUG_OTHER, "Read cluster %x\n",vol->mft_cluster+i);
+	}
+
+	/* Check and fixup this MFT record */
+	if(!ntfs_check_mft_record(vol,vol->mft)){
+		ntfs_error("Invalid MFT record 0\n");
+		goto ntfs_read_super_mft;
+	}
+
+	/* Inform the kernel about which super operations are available */
+	sb->s_op = &ntfs_super_operations;
+	sb->s_magic = NTFS_SUPER_MAGIC;
+	
+	ntfs_debug(DEBUG_OTHER, "Reading special files\n");
+	if(ntfs_load_special_files(vol)){
+		ntfs_error("Error loading special files\n");
+		goto ntfs_read_super_mft;
+	}
+
+	ntfs_debug(DEBUG_OTHER, "Getting RootDir\n");
+	/* Get the root directory */
+	if(!(sb->s_root=d_alloc_root(iget(sb,FILE_ROOT),NULL))){
+		ntfs_error("Could not get root dir inode\n");
+		goto ntfs_read_super_mft;
+	}
+	unlock_super(sb);
+	ntfs_debug(DEBUG_OTHER, "unlock_super\n");
+	ntfs_debug(DEBUG_OTHER, "read_super: done\n");
+	return sb;
+
+ntfs_read_super_mft:
+	ntfs_free(vol->mft);
+ntfs_read_super_unl:
+	sb->s_dev = 0;
+	unlock_super(sb);
+	ntfs_debug(DEBUG_OTHER, "unlock_super\n");
+ntfs_read_super_vol:
+	ntfs_free(vol);
+ntfs_read_super_dec:
+	ntfs_debug(DEBUG_OTHER, "read_super: done\n");
+	MOD_DEC_USE_COUNT;
+	return NULL;
+}
+
+/* Define the filesystem
+ *
+ * Define SECOND if you cannot unload ntfs, and want to avoid rebooting
+ * for just one more test
+ */
+struct file_system_type ntfs_fs_type = {
+/* Filesystem name, as used after mount -t */
+#ifndef SECOND
+	"ntfs",
+#else
+	"ntfs2",
+#endif
+/* This filesystem requires a device (a hard disk)
+ * May want to add FS_IBASKET when it works
+ */
+	FS_REQUIRES_DEV,
+/* Entry point of the filesystem */
+	ntfs_read_super,
+/* Will point to the next filesystem in the kernel table */
+	NULL
+};
+
+/* When this code is not compiled as a module, this is the main entry point,
+ * called by do_sys_setup() in fs/filesystems.c
+ *
+ * NOTE : __initfunc() is a macro used to remove this function from memory
+ * once initialization is done
+ */
+__initfunc(int init_ntfs_fs(void))
+{
+	/* Comment this if you trust klogd. There are reasons not to trust it
+	 */
+#if defined(DEBUG) && !defined(MODULE)
+	extern int console_loglevel;
+	console_loglevel=15;
+#endif
+	printk(KERN_NOTICE "NTFS version " NTFS_VERSION "\n");
+	SYSCTL(1);
+	ntfs_debug(DEBUG_OTHER, "registering %s\n",ntfs_fs_type.name);
+	/* add this filesystem to the kernel table of filesystems */
+	return register_filesystem(&ntfs_fs_type);
+}
+
+#ifdef MODULE
+/* A module is a piece of code which can be inserted in and removed
+ * from the running kernel whenever you want using lsmod, or on demand using
+ * kerneld
+ */
+
+/* No function of this module is needed by another module */
+EXPORT_NO_SYMBOLS;
+/* Only used for documentation purposes at the moment,
+ * see include/linux/module.h
+ */
+MODULE_AUTHOR("Martin von Löwis");
+MODULE_DESCRIPTION("NTFS driver");
+/* no MODULE_SUPPORTED_DEVICE() */
+/* Load-time parameter */
+MODULE_PARM(ntdebug, "i");
+MODULE_PARM_DESC(ntdebug, "Debug level");
+
+/* When this code is compiled as a module, if you use mount -t ntfs when no
+ * ntfs filesystem is registered (see /proc/filesystems), get_fs_type() in
+ * fs/super.c asks kerneld to load the module named ntfs in memory.
+ *
+ * Therefore, this function is the main entry point in this case
+ */
+int init_module(void)
+{
+	return init_ntfs_fs();
+}
+
+/* Called by kerneld just before the kernel removes the module from memory */
+void cleanup_module(void)
+{
+	SYSCTL(0);
+	ntfs_debug(DEBUG_OTHER, "unregistering %s\n",ntfs_fs_type.name);
+	unregister_filesystem(&ntfs_fs_type);
+}
+#endif
+
+/*
+ * Local variables:
+ *  c-file-style: "linux"
+ * End:
+ */