static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *d)
{
struct inode *res=0;
char *item=0;
ntfs_iterate_s walk;
int error;
ntfs_debug(DEBUG_NAME1, "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 ERR_PTR(-error);
item=ntfs_malloc(ITEM_SIZE);
if( !item )
return ERR_PTR(-ENOMEM);
/* 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);
/* Always return success, the dcache will handle negative entries. */
return NULL;
}
static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *d)
{
struct inode *res = 0;
char *item = 0;
ntfs_iterate_s walk;
int err;
ntfs_debug(DEBUG_NAME1, __FUNCTION__ "(): Looking up %s in directory "
"ino 0x%x.\n", d->d_name.name, (unsigned)dir->i_ino);
walk.name = NULL;
walk.namelen = 0;
/* Convert to wide string. */
err = ntfs_decodeuni(NTFS_INO2VOL(dir), (char*)d->d_name.name,
d->d_name.len, &walk.name, &walk.namelen);
if (err)
goto err_ret;
item = ntfs_malloc(ITEM_SIZE);
if (!item) {
err = -ENOMEM;
goto err_ret;
}
/* 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);
/* Always return success, the dcache will handle negative entries. */
return NULL;
err_ret:
ntfs_free(walk.name);
return ERR_PTR(err);
}
/**
* is_boot_sector_ntfs - check an NTFS boot sector for validity
* @b: buffer containing bootsector to check
*
* Check whether @b contains a valid NTFS boot sector.
* Return 1 if @b is a valid NTFS bootsector or 0 if not.
*/
static int is_boot_sector_ntfs(ntfs_u8 *b)
{
ntfs_u32 i;
/* FIXME: We don't use checksumming yet as NT4(SP6a) doesn't either...
* But we might as well have the code ready to do it. (AIA) */
#if 0
/* Calculate the checksum. */
if (b < b + 0x50) {
ntfs_u32 *u;
ntfs_u32 *bi = (ntfs_u32 *)(b + 0x50);
for (u = bi, i = 0; u < bi; ++u)
i += NTFS_GETU32(*u);
}
#endif
/* Check magic is "NTFS " */
if (b[3] != 0x4e) goto not_ntfs;
if (b[4] != 0x54) goto not_ntfs;
if (b[5] != 0x46) goto not_ntfs;
if (b[6] != 0x53) goto not_ntfs;
for (i = 7; i < 0xb; ++i)
if (b[i] != 0x20) goto not_ntfs;
/* Check bytes per sector value is between 512 and 4096. */
if (b[0xb] != 0) goto not_ntfs;
if (b[0xc] > 0x10) goto not_ntfs;
/* Check sectors per cluster value is valid. */
switch (b[0xd]) {
case 1: case 2: case 4: case 8: case 16:
case 32: case 64: case 128:
break;
default:
goto not_ntfs;
}
/* Check reserved sectors value and four other fields are zero. */
for (i = 0xe; i < 0x15; ++i)
if (b[i] != 0) goto not_ntfs;
if (b[0x16] != 0) goto not_ntfs;
if (b[0x17] != 0) goto not_ntfs;
for (i = 0x20; i < 0x24; ++i)
if (b[i] != 0) goto not_ntfs;
/* Check clusters per file record segment value is valid. */
if (b[0x40] < 0xe1 || b[0x40] > 0xf7) {
switch (b[0x40]) {
case 1: case 2: case 4: case 8: case 16: case 32: case 64:
break;
default:
goto not_ntfs;
}
}
/* Check clusters per index block value is valid. */
if (b[0x44] < 0xe1 || b[0x44] > 0xf7) {
switch (b[0x44]) {
case 1: case 2: case 4: case 8: case 16: case 32: case 64:
break;
default:
goto not_ntfs;
}
}
return 1;
not_ntfs:
return 0;
}
static int ntfs_printcb(ntfs_u8 *entry, void *param)
{
unsigned long inum = NTFS_GETU64(entry) & 0xffffffffffff;
struct ntfs_filldir *nf = param;
u32 flags = NTFS_GETU32(entry + 0x48);
char show_sys_files = 0;
u8 name_len = NTFS_GETU8(entry + 0x50);
u8 name_type = NTFS_GETU8(entry + 0x51);
int err;
unsigned file_type;
switch (nf->type) {
case ngt_dos:
/* Don't display long names. */
if (!(name_type & 2))
return 0;
break;
case ngt_nt:
/* Don't display short-only names. */
if ((name_type & 3) == 2)
return 0;
break;
case ngt_posix:
break;
case ngt_full:
show_sys_files = 1;
break;
default:
BUG();
}
err = ntfs_encodeuni(NTFS_INO2VOL(nf->dir), (ntfs_u16*)(entry + 0x52),
name_len, &nf->name, &nf->namelen);
if (err) {
ntfs_debug(DEBUG_OTHER, __FUNCTION__ "(): Skipping "
"unrepresentable file.\n");
err = 0;
goto err_ret;
}
if (!show_sys_files && inum < 0x10UL) {
ntfs_debug(DEBUG_OTHER, __FUNCTION__ "(): Skipping system "
"file (%s).\n", nf->name);
err = 0;
goto err_ret;
}
/* Do not return ".", as this is faked. */
if (nf->namelen == 1 && nf->name[0] == '.') {
ntfs_debug(DEBUG_OTHER, __FUNCTION__ "(): Skipping \".\"\n");
err = 0;
goto err_ret;
}
nf->name[nf->namelen] = 0;
if (flags & 0x10000000) /* FILE_ATTR_DUP_FILE_NAME_INDEX_PRESENT */
file_type = DT_DIR;
else
file_type = DT_REG;
ntfs_debug(DEBUG_OTHER, __FUNCTION__ "(): Calling filldir for %s with "
"len %i, f_pos 0x%Lx, inode %lu, %s.\n",
nf->name, nf->namelen, (loff_t)(nf->ph << 16) | nf->pl,
inum, file_type == DT_DIR ? "DT_DIR" : "DT_REG");
/*
* Userspace side of filldir expects an off_t rather than an loff_t.
* And it also doesn't like the most significant bit being set as it
* then considers the value to be negative. Thus this implementation
* limits the number of index records to 32766, which should be plenty.
*/
err = nf->filldir(nf->dirent, nf->name, nf->namelen,
(loff_t)(nf->ph << 16) | nf->pl, inum, file_type);
if (err)
nf->ret_code = err;
err_ret:
nf->namelen = 0;
ntfs_free(nf->name);
nf->name = NULL;
return err;
}
static int ntfs_printcb(ntfs_u8 *entry,void *param)
{
struct ntfs_filldir* nf=param;
int flags=NTFS_GETU8(entry+0x51);
int show_hidden=0;
int length=NTFS_GETU8(entry+0x50);
int inum=NTFS_GETU32(entry);
int error;
#ifdef NTFS_NGT_NT_DOES_LOWER
int i,to_lower=0;
#endif
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;
#ifdef NTFS_NGT_NT_DOES_LOWER
case 3: to_lower=1;
#endif
}
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;
#ifdef NTFS_NGT_NT_DOES_LOWER
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';
#endif
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,DT_UNKNOWN);
ntfs_free(nf->name);
/* Linux filldir errors are negative, other errors positive */
return error;
}
