fs/ntfs/fs.c

   1 /*
   2  *  fs.c
   3  *  NTFS driver for Linux 2.1
   4  *
   5  *  Copyright (C) 1995-1997 Martin von Löwis
   6  *  Copyright (C) 1996 Richard Russon
   7  *  Copyright (C) 1996-1997 Régis Duchesne
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 #include "config.h"
  12 #endif
  13 #ifdef NTFS_IN_LINUX_KERNEL
  14 #include <linux/config.h>
  15 #endif
  16
  17 #include "types.h"
  18 #include "struct.h"
  19 #include "util.h"
  20 #include "inode.h"
  21 #include "super.h"
  22 #include "dir.h"
  23 #include "support.h"
  24 #include "macros.h"
  25 #include "sysctl.h"
  26 #include <linux/module.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/nls.h>
  29 #include <linux/locks.h>
  30 #include <linux/init.h>
  31
  32 #define ITEM_SIZE 2040
  33
  34 /* io functions to user space */
  35 static void ntfs_putuser(ntfs_io* dest,void *src,ntfs_size_t len)
  36 {
  37         copy_to_user(dest->param,src,len);
  38         dest->param+=len;
  39 }
  40
  41 #ifdef CONFIG_NTFS_RW
  42 static void ntfs_getuser(void *dest,ntfs_io *src,ntfs_size_t len)
  43 {
  44         copy_from_user(dest,src->param,len);
  45         src->param+=len;
  46 }
  47 #endif
  48
  49 static ssize_t
  50 ntfs_read(struct file * filp, char *buf, size_t count, loff_t *off)
  51 {
  52         int error;
  53         ntfs_io io;
  54         ntfs_inode *ino=NTFS_LINO2NINO(filp->f_dentry->d_inode);
  55
  56         /* inode is not properly initialized */
  57         if(!ino)return -EINVAL;
  58         ntfs_debug(DEBUG_OTHER, "ntfs_read %x,%x,%x ->",
  59                    (unsigned)ino->i_number,(unsigned)*off,(unsigned)count);
  60         /* inode has no unnamed data attribute */
  61         if(!ntfs_find_attr(ino,ino->vol->at_data,NULL))
  62                 return -EINVAL;
  63
  64         /* read the data */
  65         io.fn_put=ntfs_putuser;
  66         io.fn_get=0;
  67         io.param=buf;
  68         io.size=count;
  69         error=ntfs_read_attr(ino,ino->vol->at_data,NULL,*off,&io);
  70         if(error)return -error;
  71
  72         *off+=io.size;
  73         return io.size;
  74 }
  75
  76 #ifdef CONFIG_NTFS_RW
  77 static ssize_t
  78 ntfs_write(struct file *filp,const char* buf,size_t count,loff_t *pos)
  79 {
  80         struct super_block* sb;
  81         int ret;
  82         ntfs_io io;
  83         ntfs_inode *ino=NTFS_LINO2NINO(filp->f_dentry->d_inode);
  84
  85         if(!ino)return -EINVAL;
  86         ntfs_debug(DEBUG_OTHER, "ntfs_write %x,%x,%x ->",
  87                (unsigned)ino->i_number,(unsigned)*pos,(unsigned)count);
  88         sb = filp->f_dentry->d_inode->i_sb;
  89         /* Allows to lock fs ro at any time */
  90         if(sb->s_flags & MS_RDONLY)
  91                 return -ENOSPC;
  92         if(!ntfs_find_attr(ino,ino->vol->at_data,NULL))
  93                 return -EINVAL;
  94
  95         io.fn_put=0;
  96         io.fn_get=ntfs_getuser;
  97         io.param=(void*)buf; /* to get rid of the const */
  98         io.size=count;
  99         ret = ntfs_write_attr(ino,ino->vol->at_data,NULL,*pos,&io);
 100         ntfs_debug(DEBUG_OTHER, "%x\n",ret);
 101         if(ret<0)return -EINVAL;
 102
 103         *pos+=ret;
 104         return ret;
 105 }
 106 #endif
 107
 108 struct ntfs_filldir{
 109         struct inode *dir;
 110         filldir_t filldir;
 111         unsigned int type;
 112         ntfs_u32 ph,pl;
 113         void *dirent;
 114         char *name;
 115         int namelen;
 116 };
 117
 118 static int ntfs_printcb(ntfs_u8 *entry,void *param)
 119 {
 120         struct ntfs_filldir* nf=param;
 121         int flags=NTFS_GETU8(entry+0x51);
 122         int show_hidden=0,to_lower=0;
 123         int length=NTFS_GETU8(entry+0x50);
 124         int inum=NTFS_GETU32(entry);
 125         int i,error;
 126         switch(nf->type){
 127         case ngt_dos:
 128                 /* Don't display long names */
 129                 if((flags & 2)==0)
 130                         return 0;
 131                 break;
 132         case ngt_nt:
 133                 /* Don't display short-only names */
 134                 switch(flags&3){
 135                 case 2: return 0;
 136                 case 3: to_lower=1;
 137                 }
 138                 break;
 139         case ngt_posix:
 140                 break;
 141         case ngt_full:
 142                 show_hidden=1;
 143                 break;
 144         }
 145         if(!show_hidden && ((NTFS_GETU8(entry+0x48) & 2)==2)){
 146                 ntfs_debug(DEBUG_OTHER,"Skipping hidden file\n");
 147                 return 0;
 148         }
 149         nf->name=0;
 150         if(ntfs_encodeuni(NTFS_INO2VOL(nf->dir),(ntfs_u16*)(entry+0x52),
 151                           length,&nf->name,&nf->namelen)){
 152                 ntfs_debug(DEBUG_OTHER,"Skipping unrepresentable file\n");
 153                 if(nf->name)ntfs_free(nf->name);
 154                 return 0;
 155         }
 156         /* Do not return ".", as this is faked */
 157         if(length==1 && *nf->name=='.')
 158                 return 0;
 159         if(to_lower)
 160                 for(i=0;i<nf->namelen;i++)
 161                         /* This supports ASCII only. Since only DOS-only
 162                            names get converted, and since those are restricted
 163                            to ASCII, this should be correct */
 164                         if(nf->name[i]>='A' && nf->name[i]<='Z')
 165                                 nf->name[i]+='a'-'A';
 166         nf->name[nf->namelen]=0;
 167         ntfs_debug(DEBUG_OTHER, "readdir got %s,len %d\n",nf->name,nf->namelen);
 168         /* filldir expects an off_t rather than an loff_t.
 169            Hope we don't have more than 65535 index records */
 170         error=nf->filldir(nf->dirent,nf->name,nf->namelen,
 171                         (nf->ph<<16)|nf->pl,inum);
 172         ntfs_free(nf->name);
 173         /* Linux filldir errors are negative, other errors positive */
 174         return error;
 175 }
 176
 177 /* readdir returns '..', then '.', then the directory entries in sequence
 178    As the root directory contains a entry for itself, '.' is not emulated
 179    for the root directory */
 180 static int ntfs_readdir(struct file* filp, void *dirent, filldir_t filldir)
 181 {
 182         struct ntfs_filldir cb;
 183         int error;
 184         struct inode *dir=filp->f_dentry->d_inode;
 185
 186         ntfs_debug(DEBUG_OTHER, "ntfs_readdir ino %x mode %x\n",
 187                (unsigned)dir->i_ino,(unsigned int)dir->i_mode);
 188         if(!dir || (dir->i_ino==0) || !S_ISDIR(dir->i_mode))return -EBADF;
 189
 190         ntfs_debug(DEBUG_OTHER, "readdir: Looking for file %x dircount %d\n",
 191                (unsigned)filp->f_pos,dir->i_count);
 192         cb.pl=filp->f_pos & 0xFFFF;
 193         cb.ph=filp->f_pos >> 16;
 194         /* end of directory */
 195         if(cb.ph==0xFFFF){
 196                 /* FIXME: Maybe we can return those with the previous call */
 197                 switch(cb.pl){
 198                 case 0: filldir(dirent,".",1,filp->f_pos,dir->i_ino);
 199                         filp->f_pos=0xFFFF0001;
 200                         return 0;
 201                         /* FIXME: parent directory */
 202                 case 1: filldir(dirent,"..",2,filp->f_pos,0);
 203                         filp->f_pos=0xFFFF0002;
 204                         return 0;
 205                 }
 206                 ntfs_debug(DEBUG_OTHER, "readdir: EOD\n");
 207                 return 0;
 208         }
 209         cb.dir=dir;
 210         cb.filldir=filldir;
 211         cb.dirent=dirent;
 212         cb.type=NTFS_INO2VOL(dir)->ngt;
 213         do{
 214                 ntfs_debug(DEBUG_OTHER,"looking for next file\n");
 215                 error=ntfs_getdir_unsorted(NTFS_LINO2NINO(dir),&cb.ph,&cb.pl,
 216                                    ntfs_printcb,&cb);
 217         }while(!error && cb.ph!=0xFFFFFFFF);
 218         filp->f_pos=(cb.ph<<16)|cb.pl;
 219         ntfs_debug(DEBUG_OTHER, "new position %x\n",(unsigned)filp->f_pos);
 220         /* -EINVAL is on user buffer full. This is not considered
 221            as an error by sys_getdents */
 222         if(error<0)
 223                 error=0;
 224         /* Otherwise (device error, inconsistent data), switch the sign */
 225         return -error;
 226 }
 227
 228 /* Copied from vfat driver */
 229 static int simple_getbool(char *s, int *setval)
 230 {
 231         if (s) {
 232                 if (!strcmp(s,"1") || !strcmp(s,"yes") || !strcmp(s,"true")) {
 233                         *setval = 1;
 234                 } else if (!strcmp(s,"0") || !strcmp(s,"no") || !strcmp(s,"false")) {
 235                         *setval = 0;
 236                 } else {
 237                         return 0;
 238                 }
 239         } else {
 240                 *setval = 1;
 241         }
 242         return 1;
 243 }
 244
 245 /* Parse the (re)mount options */
 246 static int parse_options(ntfs_volume* vol,char *opt)
 247 {
 248         char *value;
 249
 250         vol->uid=vol->gid=0;
 251         vol->umask=0077;
 252         vol->ngt=ngt_nt;
 253         vol->nls_map=0;
 254         vol->nct=0;
 255         if(!opt)goto done;
 256
 257         for(opt = strtok(opt,",");opt;opt=strtok(NULL,","))
 258         {
 259                 if ((value = strchr(opt, '=')) != NULL)
 260                         *value++='\0';
 261                 if(strcmp(opt,"uid")==0)
 262                 {
 263                         if(!value || !*value)goto needs_arg;
 264                         vol->uid=simple_strtoul(value,&value,0);
 265                         if(*value){
 266                                 printk(KERN_ERR "NTFS: uid invalid argument\n");
 267                                 return 0;
 268                         }
 269                 }else if(strcmp(opt, "gid") == 0)
 270                 {
 271                         if(!value || !*value)goto needs_arg;
 272                         vol->gid=simple_strtoul(value,&value,0);
 273                         if(*value){
 274                                 printk(KERN_ERR "gid invalid argument\n");
 275                                 return 0;
 276                         }
 277                 }else if(strcmp(opt, "umask") == 0)
 278                 {
 279                         if(!value || !*value)goto needs_arg;
 280                         vol->umask=simple_strtoul(value,&value,0);
 281                         if(*value){
 282                                 printk(KERN_ERR "umask invalid argument\n");
 283                                 return 0;
 284                         }
 285                 }else if(strcmp(opt, "iocharset") == 0){
 286                         if(!value || !*value)goto needs_arg;
 287                         vol->nls_map=load_nls(value);
 288                         vol->nct |= nct_map;
 289                         if(!vol->nls_map){
 290                                 printk(KERN_ERR "NTFS: charset not found");
 291                                 return 0;
 292                         }
 293                 }else if(strcmp(opt, "posix") == 0){
 294                         int val;
 295                         if(!value || !*value)goto needs_arg;
 296                         if(!simple_getbool(value,&val))
 297                                 goto needs_bool;
 298                         vol->ngt=val?ngt_posix:ngt_nt;
 299                 }else if(strcmp(opt,"utf8") == 0){
 300                         int val=0;
 301                         if(!value || !*value)
 302                                 val=1;
 303                         else if(!simple_getbool(value,&val))
 304                                 goto needs_bool;
 305                         if(val)
 306                                 vol->nct|=nct_utf8;
 307                 }else if(strcmp(opt,"uni_xlate") == 0){
 308                         int val=0;
 309                         /* no argument: uni_vfat.
 310                            boolean argument: uni_vfat.
 311                            "2": uni.
 312                         */
 313                         if(!value || !*value)
 314                                 val=1;
 315                         else if(strcmp(value,"2")==0)
 316                                 vol->nct |= nct_uni_xlate;
 317                         else if(!simple_getbool(value,&val))
 318                                 goto needs_bool;
 319                         if(val)
 320                                 vol->nct |= nct_uni_xlate_vfat | nct_uni_xlate;
 321                 }else{
 322                         printk(KERN_ERR "NTFS: unkown option '%s'\n", opt);
 323                         return 0;
 324                 }
 325         }
 326         if(vol->nct & nct_utf8 & (nct_map | nct_uni_xlate)){
 327                 printk(KERN_ERR "utf8 cannot be combined with iocharset or uni_xlate\n");
 328                 return 0;
 329         }
 330  done:
 331         if((vol->nct & (nct_uni_xlate | nct_map | nct_utf8))==0)
 332                 /* default to UTF-8 */
 333                 vol->nct=nct_utf8;
 334         if(!vol->nls_map)
 335                 vol->nls_map=load_nls_default();
 336         return 1;
 337
 338  needs_arg:
 339         printk(KERN_ERR "NTFS: %s needs an argument",opt);
 340         return 0;
 341  needs_bool:
 342         printk(KERN_ERR "NTFS: %s needs boolean argument",opt);
 343         return 0;
 344 }
 345
 346 static int ntfs_lookup(struct inode *dir, struct dentry *d)
 347 {
 348         struct inode *res=0;
 349         char *item=0;
 350         ntfs_iterate_s walk;
 351         int error;
 352         ntfs_debug(DEBUG_OTHER, "Looking up %s in %x\n",d->d_name.name,
 353                    (unsigned)dir->i_ino);
 354         /* convert to wide string */
 355         error=ntfs_decodeuni(NTFS_INO2VOL(dir),(char*)d->d_name.name,
 356                              d->d_name.len,&walk.name,&walk.namelen);
 357         if(error)
 358                 return error;
 359         item=ntfs_malloc(ITEM_SIZE);
 360         /* ntfs_getdir will place the directory entry into item,
 361            and the first long long is the MFT record number */
 362         walk.type=BY_NAME;
 363         walk.dir=NTFS_LINO2NINO(dir);
 364         walk.result=item;
 365         if(ntfs_getdir_byname(&walk))
 366         {
 367                 res=iget(dir->i_sb,NTFS_GETU32(item));
 368         }
 369         d_add(d,res);
 370         ntfs_free(item);
 371         ntfs_free(walk.name);
 372         return res?0:-ENOENT;
 373 }
 374
 375 struct file_operations ntfs_file_operations_nommap = {
 376         NULL, /* lseek */
 377         ntfs_read,
 378 #ifdef CONFIG_NTFS_RW
 379         ntfs_write,
 380 #else
 381         NULL,
 382 #endif
 383         NULL, /* readdir */
 384         NULL, /* select */
 385         NULL, /* ioctl */
 386         NULL, /* mmap */
 387         NULL, /* open */
 388         NULL, /* release */
 389         NULL, /* fsync */
 390         NULL, /* fasync */
 391         NULL, /* check_media_change */
 392         NULL, /* revalidate */
 393         NULL, /* lock */
 394 };
 395
 396 struct inode_operations ntfs_inode_operations_nobmap = {
 397         &ntfs_file_operations_nommap,
 398         NULL, /* create */
 399         NULL, /* lookup */
 400         NULL, /* link */
 401         NULL, /* unlink */
 402         NULL, /* symlink */
 403         NULL, /* mkdir */
 404         NULL, /* rmdir */
 405         NULL, /* mknod */
 406         NULL, /* rename */
 407         NULL, /* readlink */
 408         NULL, /* follow_link */
 409         NULL, /* readpage */
 410         NULL, /* writepage */
 411         NULL, /* bmap */
 412         NULL, /* truncate */
 413         NULL, /* permission */
 414         NULL, /* smap */
 415         NULL, /* updatepage */
 416         NULL, /* revalidate */
 417 };
 418
 419 #ifdef CONFIG_NTFS_RW
 420 static int
 421 ntfs_create(struct inode* dir,struct dentry *d,int mode)
 422 {
 423         struct inode *r=0;
 424         ntfs_inode *ino=0;
 425         ntfs_volume *vol;
 426         int error=0;
 427         ntfs_attribute *si;
 428
 429         r=get_empty_inode();
 430         if(!r){
 431                 error=ENOMEM;
 432                 goto fail;
 433         }
 434
 435         ntfs_debug(DEBUG_OTHER, "ntfs_create %s\n",d->d_name.name);
 436         vol=NTFS_INO2VOL(dir);
 437 #ifdef NTFS_IN_LINUX_KERNEL
 438         ino=NTFS_LINO2NINO(r);
 439 #else
 440         ino=ntfs_malloc(sizeof(ntfs_inode));
 441         if(!ino){
 442                 error=ENOMEM;
 443                 goto fail;
 444         }
 445         r->u.generic_ip=ino;
 446 #endif
 447         error=ntfs_alloc_inode(NTFS_LINO2NINO(dir),ino,(char*)d->d_name.name,
 448                                d->d_name.len);
 449         if(error)goto fail;
 450         error=ntfs_update_inode(ino);
 451         if(error)goto fail;
 452         error=ntfs_update_inode(NTFS_LINO2NINO(dir));
 453         if(error)goto fail;
 454
 455         r->i_uid=vol->uid;
 456         r->i_gid=vol->gid;
 457         r->i_nlink=1;
 458         r->i_sb=dir->i_sb;
 459         /* FIXME: dirty? dev? */
 460         /* get the file modification times from the standard information */
 461         si=ntfs_find_attr(ino,vol->at_standard_information,NULL);
 462         if(si){
 463                 char *attr=si->d.data;
 464                 r->i_atime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+0x18));
 465                 r->i_ctime=ntfs_ntutc2unixutc(NTFS_GETU64(attr));
 466                 r->i_mtime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+8));
 467         }
 468         /* It's not a directory */
 469         r->i_op=&ntfs_inode_operations_nobmap;
 470         r->i_mode=S_IFREG|S_IRUGO;
 471 #ifdef CONFIG_NTFS_RW
 472         r->i_mode|=S_IWUGO;
 473 #endif
 474         r->i_mode &= ~vol->umask;
 475
 476         d_instantiate(d,r);
 477         return 0;
 478  fail:
 479         #ifndef NTFS_IN_LINUX_KERNEL
 480         if(ino)ntfs_free(ino);
 481         #endif
 482         if(r)iput(r);
 483         return -error;
 484 }
 485 #endif
 486
 487 static int
 488 ntfs_bmap(struct inode *ino,int block)
 489 {
 490         int ret=ntfs_vcn_to_lcn(NTFS_LINO2NINO(ino),block);
 491         ntfs_debug(DEBUG_OTHER, "bmap of %lx,block %x is %x\n",
 492                ino->i_ino,block,ret);
 493         return (ret==-1) ? 0:ret;
 494 }
 495
 496 struct file_operations ntfs_file_operations = {
 497         NULL, /* lseek */
 498         ntfs_read,
 499 #ifdef CONFIG_NTFS_RW
 500         ntfs_write,
 501 #else
 502         NULL,
 503 #endif
 504         NULL, /* readdir */
 505         NULL, /* select */
 506         NULL, /* ioctl */
 507         generic_file_mmap,
 508         NULL, /* open */
 509         NULL, /* release */
 510         NULL, /* fsync */
 511         NULL, /* fasync */
 512         NULL, /* check_media_change */
 513         NULL, /* revalidate */
 514         NULL, /* lock */
 515 };
 516
 517 struct inode_operations ntfs_inode_operations = {
 518         &ntfs_file_operations,
 519         NULL, /* create */
 520         NULL, /* lookup */
 521         NULL, /* link */
 522         NULL, /* unlink */
 523         NULL, /* symlink */
 524         NULL, /* mkdir */
 525         NULL, /* rmdir */
 526         NULL, /* mknod */
 527         NULL, /* rename */
 528         NULL, /* readlink */
 529         NULL, /* follow_link */
 530         generic_readpage,
 531         NULL, /* writepage */
 532         ntfs_bmap,
 533         NULL, /* truncate */
 534         NULL, /* permission */
 535         NULL, /* smap */
 536         NULL, /* updatepage */
 537         NULL, /* revalidate */
 538 };
 539
 540 struct file_operations ntfs_dir_operations = {
 541         NULL, /* lseek */
 542         NULL, /* read */
 543         NULL, /* write */
 544         ntfs_readdir, /* readdir */
 545         NULL, /* poll */
 546         NULL, /* ioctl */
 547         NULL, /* mmap */
 548         NULL, /* open */
 549         NULL, /* release */
 550         NULL, /* fsync */
 551         NULL, /* fasync */
 552         NULL, /* check_media_change */
 553         NULL, /* revalidate */
 554         NULL, /* lock */
 555 };
 556
 557 struct inode_operations ntfs_dir_inode_operations = {
 558         &ntfs_dir_operations,
 559 #ifdef CONFIG_NTFS_RW
 560         ntfs_create, /* create */
 561 #else
 562         NULL,
 563 #endif
 564         ntfs_lookup, /* lookup */
 565         NULL, /* link */
 566         NULL, /* unlink */
 567         NULL, /* symlink */
 568         NULL, /* mkdir */
 569         NULL, /* rmdir */
 570         NULL, /* mknod */
 571         NULL, /* rename */
 572         NULL, /* readlink */
 573         NULL, /* follow_link */
 574         NULL, /* readpage */
 575         NULL, /* writepage */
 576         NULL, /* bmap */
 577         NULL, /* truncate */
 578         NULL, /* permission */
 579         NULL, /* smap */
 580         NULL, /* updatepage */
 581         NULL, /* revalidate */
 582 };
 583
 584 /* ntfs_read_inode is called by the Virtual File System (the kernel layer that
 585  * deals with filesystems) when iget is called requesting an inode not already
 586  * present in the inode table. Typically filesystems have separate
 587  * inode_operations for directories, files and symlinks.
 588  */
 589 static void ntfs_read_inode(struct inode* inode)
 590 {
 591         ntfs_volume *vol;
 592         int can_mmap=0;
 593         ntfs_inode *ino;
 594         ntfs_attribute *data;
 595         ntfs_attribute *si;
 596
 597         vol=NTFS_INO2VOL(inode);
 598         inode->i_op=NULL;
 599         inode->i_mode=0;
 600         ntfs_debug(DEBUG_OTHER, "ntfs_read_inode %x\n",(unsigned)inode->i_ino);
 601
 602         switch(inode->i_ino)
 603         {
 604                 /* those are loaded special files */
 605         case FILE_MFT:
 606                 ntfs_error("Trying to open MFT\n");return;
 607         default:
 608                 #ifdef NTFS_IN_LINUX_KERNEL
 609                 ino=&inode->u.ntfs_i;
 610                 #else
 611                 ino=(ntfs_inode*)ntfs_malloc(sizeof(ntfs_inode));
 612                 inode->u.generic_ip=ino;
 613                 #endif
 614                 if(!ino || ntfs_init_inode(ino,
 615                                            NTFS_INO2VOL(inode),inode->i_ino))
 616                 {
 617                         ntfs_debug(DEBUG_OTHER, "NTFS:Error loading inode %x\n",
 618                                (unsigned int)inode->i_ino);
 619                         return;
 620                 }
 621         }
 622         /* Set uid/gid from mount options */
 623         inode->i_uid=vol->uid;
 624         inode->i_gid=vol->gid;
 625         inode->i_nlink=1;
 626         /* Use the size of the data attribute as file size */
 627         data = ntfs_find_attr(ino,vol->at_data,NULL);
 628         if(!data)
 629         {
 630                 inode->i_size=0;
 631                 can_mmap=0;
 632         }
 633         else
 634         {
 635                 inode->i_size=data->size;
 636                 can_mmap=!data->resident && !data->compressed;
 637         }
 638         /* get the file modification times from the standard information */
 639         si=ntfs_find_attr(ino,vol->at_standard_information,NULL);
 640         if(si){
 641                 char *attr=si->d.data;
 642                 inode->i_atime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+0x18));
 643                 inode->i_ctime=ntfs_ntutc2unixutc(NTFS_GETU64(attr));
 644                 inode->i_mtime=ntfs_ntutc2unixutc(NTFS_GETU64(attr+8));
 645         }
 646         /* if it has an index root, it's a directory */
 647         if(ntfs_find_attr(ino,vol->at_index_root,"$I30"))
 648         {
 649                 ntfs_attribute *at;
 650                 at = ntfs_find_attr (ino, vol->at_index_allocation, "$I30");
 651                 inode->i_size = at ? at->size : 0;
 652
 653                 inode->i_op=&ntfs_dir_inode_operations;
 654                 inode->i_mode=S_IFDIR|S_IRUGO|S_IXUGO;
 655         }
 656         else
 657         {
 658                 inode->i_op=can_mmap ? &ntfs_inode_operations :
 659                         &ntfs_inode_operations_nobmap;
 660                 inode->i_mode=S_IFREG|S_IRUGO;
 661         }
 662 #ifdef CONFIG_NTFS_RW
 663         if(!data || !data->compressed)
 664                 inode->i_mode|=S_IWUGO;
 665 #endif
 666         inode->i_mode &= ~vol->umask;
 667 }
 668
 669 static void ntfs_put_inode(struct inode *ino)
 670 {
 671         ntfs_debug(DEBUG_OTHER, "ntfs_put_inode %lx\n",ino->i_ino);
 672 #ifdef NTFS_IN_LINUX_KERNEL
 673         if(ino->i_ino!=FILE_MFT)
 674                 ntfs_clear_inode(&ino->u.ntfs_i);
 675 #else
 676         if(ino->i_ino!=FILE_MFT && ino->u.generic_ip)
 677         {
 678                 ntfs_clear_inode(ino->u.generic_ip);
 679                 ntfs_free(ino->u.generic_ip);
 680                 ino->u.generic_ip=0;
 681         }
 682 #endif
 683         clear_inode(ino);
 684 }
 685
 686 /* Called when umounting a filesystem by do_umount() in fs/super.c */
 687 static void ntfs_put_super(struct super_block *sb)
 688 {
 689         ntfs_volume *vol;
 690
 691         ntfs_debug(DEBUG_OTHER, "ntfs_put_super\n");
 692         /* Ensure that nobody uses the super block anymore */
 693         lock_super(sb);
 694         vol=NTFS_SB2VOL(sb);
 695         /* Tell the kernel that the super block is no more used */
 696         sb->s_dev = 0;
 697         unlock_super(sb);
 698         ntfs_release_volume(vol);
 699         if(vol->nls_map)
 700                 unload_nls(vol->nls_map);
 701 #ifndef NTFS_IN_LINUX_KERNEL
 702         ntfs_free(vol);
 703 #endif
 704         ntfs_debug(DEBUG_OTHER, "ntfs_put_super: done\n");
 705         MOD_DEC_USE_COUNT;
 706 }
 707
 708 /* Called by the kernel when asking for stats */
 709 static int ntfs_statfs(struct super_block *sb, struct statfs *sf, int bufsize)
 710 {
 711         struct statfs fs;
 712         struct inode *mft;
 713         ntfs_volume *vol;
 714
 715         ntfs_debug(DEBUG_OTHER, "ntfs_statfs\n");
 716         vol=NTFS_SB2VOL(sb);
 717         memset(&fs,0,sizeof(fs));
 718         fs.f_type=NTFS_SUPER_MAGIC;
 719         fs.f_bsize=vol->clustersize;
 720
 721         fs.f_blocks=ntfs_get_volumesize(NTFS_SB2VOL(sb));
 722         fs.f_bfree=ntfs_get_free_cluster_count(vol->bitmap);
 723         fs.f_bavail=fs.f_bfree;
 724
 725         /* Number of files is limited by free space only, so we lie here */
 726         fs.f_ffree=0;
 727         mft=iget(sb,FILE_MFT);
 728         fs.f_files=mft->i_size/vol->mft_recordsize;
 729         iput(mft);
 730
 731         /* should be read from volume */
 732         fs.f_namelen=255;
 733         copy_to_user(sf,&fs,bufsize);
 734         return 0;
 735 }
 736
 737 /* Called when remounting a filesystem by do_remount_sb() in fs/super.c */
 738 static int ntfs_remount_fs(struct super_block *sb, int *flags, char *options)
 739 {
 740         if(!parse_options(NTFS_SB2VOL(sb), options))
 741                 return -EINVAL;
 742         return 0;
 743 }
 744
 745 /* Define the super block operation that are implemented */
 746 struct super_operations ntfs_super_operations = {
 747         ntfs_read_inode,
 748         NULL, /* write_inode */
 749         ntfs_put_inode,
 750         NULL, /* delete_inode */
 751         NULL, /* notify_change */
 752         ntfs_put_super,
 753         NULL, /* write_super */
 754         ntfs_statfs,
 755         ntfs_remount_fs, /* remount */
 756 };
 757
 758 /* Called to mount a filesystem by read_super() in fs/super.c
 759  * Return a super block, the main structure of a filesystem
 760  *
 761  * NOTE : Don't store a pointer to an option, as the page containing the
 762  * options is freed after ntfs_read_super() returns.
 763  *
 764  * NOTE : A context switch can happen in kernel code only if the code blocks
 765  * (= calls schedule() in kernel/sched.c).
 766  */
 767 struct super_block * ntfs_read_super(struct super_block *sb,
 768                                      void *options, int silent)
 769 {
 770         ntfs_volume *vol;
 771         struct buffer_head *bh;
 772         int i;
 773
 774         /* When the driver is compiled as a module, kerneld must know when it
 775          * can safely remove it from memory. To do this, each module owns a
 776          * reference counter.
 777          */
 778         MOD_INC_USE_COUNT;
 779         /* Don't put ntfs_debug() before MOD_INC_USE_COUNT, printk() can block
 780          * so this could lead to a race condition with kerneld.
 781          */
 782         ntfs_debug(DEBUG_OTHER, "ntfs_read_super\n");
 783
 784 #ifdef NTFS_IN_LINUX_KERNEL
 785         vol = NTFS_SB2VOL(sb);
 786 #else
 787         if(!(vol = ntfs_malloc(sizeof(ntfs_volume))))
 788                 goto ntfs_read_super_dec;
 789         NTFS_SB2VOL(sb)=vol;
 790 #endif
 791
 792         if(!parse_options(vol,(char*)options))
 793                 goto ntfs_read_super_vol;
 794
 795         /* Ensure that the super block won't be used until it is completed */
 796         lock_super(sb);
 797         ntfs_debug(DEBUG_OTHER, "lock_super\n");
 798 #if 0
 799         /* Set to read only, user option might reset it */
 800         sb->s_flags |= MS_RDONLY;
 801 #endif
 802
 803         /* Assume a 512 bytes block device for now */
 804         set_blocksize(sb->s_dev, 512);
 805         /* Read the super block (boot block) */
 806         if(!(bh=bread(sb->s_dev,0,512))) {
 807                 ntfs_error("Reading super block failed\n");
 808                 goto ntfs_read_super_unl;
 809         }
 810         ntfs_debug(DEBUG_OTHER, "Done reading boot block\n");
 811
 812         /* Check for 'NTFS' magic number */
 813         if(!IS_NTFS_VOLUME(bh->b_data)){
 814                 ntfs_debug(DEBUG_OTHER, "Not a NTFS volume\n");
 815                 brelse(bh);
 816                 goto ntfs_read_super_unl;
 817         }
 818
 819         ntfs_debug(DEBUG_OTHER, "Going to init volume\n");
 820         ntfs_init_volume(vol,bh->b_data);
 821         ntfs_debug(DEBUG_OTHER, "MFT record at cluster 0x%X\n",vol->mft_cluster);
 822         brelse(bh);
 823         NTFS_SB(vol)=sb;
 824         ntfs_debug(DEBUG_OTHER, "Done to init volume\n");
 825
 826         /* Inform the kernel that a device block is a NTFS cluster */
 827         sb->s_blocksize=vol->clustersize;
 828         for(i=sb->s_blocksize,sb->s_blocksize_bits=0;i;i>>=1)
 829                 sb->s_blocksize_bits++;
 830         set_blocksize(sb->s_dev,sb->s_blocksize);
 831         ntfs_debug(DEBUG_OTHER, "set_blocksize\n");
 832
 833         /* Allocate a MFT record (MFT record can be smaller than a cluster) */
 834         if(!(vol->mft=ntfs_malloc(max(vol->mft_recordsize,vol->clustersize))))
 835                 goto ntfs_read_super_unl;
 836
 837         /* Read at least the MFT record for $MFT */
 838         for(i=0;i<max(vol->mft_clusters_per_record,1);i++){
 839                 if(!(bh=bread(sb->s_dev,vol->mft_cluster+i,vol->clustersize))) {
 840                         ntfs_error("Could not read MFT record 0\n");
 841                         goto ntfs_read_super_mft;
 842                 }
 843                 ntfs_memcpy(vol->mft+i*vol->clustersize,bh->b_data,vol->clustersize);
 844                 brelse(bh);
 845                 ntfs_debug(DEBUG_OTHER, "Read cluster %x\n",vol->mft_cluster+i);
 846         }
 847
 848         /* Check and fixup this MFT record */
 849         if(!ntfs_check_mft_record(vol,vol->mft)){
 850                 ntfs_error("Invalid MFT record 0\n");
 851                 goto ntfs_read_super_mft;
 852         }
 853
 854         /* Inform the kernel about which super operations are available */
 855         sb->s_op = &ntfs_super_operations;
 856         sb->s_magic = NTFS_SUPER_MAGIC;
 857
 858         ntfs_debug(DEBUG_OTHER, "Reading special files\n");
 859         if(ntfs_load_special_files(vol)){
 860                 ntfs_error("Error loading special files\n");
 861                 goto ntfs_read_super_mft;
 862         }
 863
 864         ntfs_debug(DEBUG_OTHER, "Getting RootDir\n");
 865         /* Get the root directory */
 866         if(!(sb->s_root=d_alloc_root(iget(sb,FILE_ROOT),NULL))){
 867                 ntfs_error("Could not get root dir inode\n");
 868                 goto ntfs_read_super_mft;
 869         }
 870         unlock_super(sb);
 871         ntfs_debug(DEBUG_OTHER, "unlock_super\n");
 872         ntfs_debug(DEBUG_OTHER, "read_super: done\n");
 873         return sb;
 874
 875 ntfs_read_super_mft:
 876         ntfs_free(vol->mft);
 877 ntfs_read_super_unl:
 878         sb->s_dev = 0;
 879         unlock_super(sb);
 880         ntfs_debug(DEBUG_OTHER, "unlock_super\n");
 881 ntfs_read_super_vol:
 882         #ifndef NTFS_IN_LINUX_KERNEL
 883         ntfs_free(vol);
 884 ntfs_read_super_dec:
 885         #endif
 886         ntfs_debug(DEBUG_OTHER, "read_super: done\n");
 887         MOD_DEC_USE_COUNT;
 888         return NULL;
 889 }
 890
 891 /* Define the filesystem
 892  *
 893  * Define SECOND if you cannot unload ntfs, and want to avoid rebooting
 894  * for just one more test
 895  */
 896 struct file_system_type ntfs_fs_type = {
 897 /* Filesystem name, as used after mount -t */
 898 #ifndef SECOND
 899         "ntfs",
 900 #else
 901         "ntfs2",
 902 #endif
 903 /* This filesystem requires a device (a hard disk)
 904  * May want to add FS_IBASKET when it works
 905  */
 906         FS_REQUIRES_DEV,
 907 /* Entry point of the filesystem */
 908         ntfs_read_super,
 909 /* Will point to the next filesystem in the kernel table */
 910         NULL
 911 };
 912
 913 /* When this code is not compiled as a module, this is the main entry point,
 914  * called by do_sys_setup() in fs/filesystems.c
 915  *
 916  * NOTE : __initfunc() is a macro used to remove this function from memory
 917  * once initialization is done
 918  */
 919 __initfunc(int init_ntfs_fs(void))
 920 {
 921         /* Comment this if you trust klogd. There are reasons not to trust it
 922          */
 923 #if defined(DEBUG) && !defined(MODULE)
 924         extern int console_loglevel;
 925         console_loglevel=15;
 926 #endif
 927         printk(KERN_NOTICE "NTFS version " NTFS_VERSION "\n");
 928         SYSCTL(1);
 929         ntfs_debug(DEBUG_OTHER, "registering %s\n",ntfs_fs_type.name);
 930         /* add this filesystem to the kernel table of filesystems */
 931         return register_filesystem(&ntfs_fs_type);
 932 }
 933
 934 #ifdef MODULE
 935 /* A module is a piece of code which can be inserted in and removed
 936  * from the running kernel whenever you want using lsmod, or on demand using
 937  * kerneld
 938  */
 939
 940 /* No function of this module is needed by another module */
 941 EXPORT_NO_SYMBOLS;
 942 /* Only used for documentation purposes at the moment,
 943  * see include/linux/module.h
 944  */
 945 MODULE_AUTHOR("Martin von Löwis");
 946 MODULE_DESCRIPTION("NTFS driver");
 947 /* no MODULE_SUPPORTED_DEVICE() */
 948 /* Load-time parameter */
 949 MODULE_PARM(ntdebug, "i");
 950 MODULE_PARM_DESC(ntdebug, "Debug level");
 951
 952 /* When this code is compiled as a module, if you use mount -t ntfs when no
 953  * ntfs filesystem is registered (see /proc/filesystems), get_fs_type() in
 954  * fs/super.c asks kerneld to load the module named ntfs in memory.
 955  *
 956  * Therefore, this function is the main entry point in this case
 957  */
 958 int init_module(void)
 959 {
 960         return init_ntfs_fs();
 961 }
 962
 963 /* Called by kerneld just before the kernel removes the module from memory */
 964 void cleanup_module(void)
 965 {
 966         SYSCTL(0);
 967         ntfs_debug(DEBUG_OTHER, "unregistering %s\n",ntfs_fs_type.name);
 968         unregister_filesystem(&ntfs_fs_type);
 969 }
 970 #endif
 971
 972 /*
 973  * Local variables:
 974  *  c-file-style: "linux"
 975  * End:
 976  */