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/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2017 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <ntapi/ntapi.h>
#include <ntapi/nt_fsctl.h>
#include <ntapi/nt_mount.h>
#include <ntapi/nt_statfs.h>
#include "ntapi_impl.h"
int32_t __stdcall __ntapi_tt_statfs(
__in void * hfile,
__out nt_statfs * statfs,
__in uint32_t infolen,
__out uintptr_t * buffer,
__in uint32_t buffer_size,
__in uint32_t flags)
{
int32_t status;
nt_iosb iosb;
nt_unicode_string * sdev;
wchar16_t * wch;
wchar16_t * wch_mark;
wchar16_t * wch_cap;
uint32_t offset;
uint32_t hash;
void * mnt_points_buffer;
nt_mount_points * mnt_points;
nt_fsai * fsai;
nt_fsfsi * fsfsi;
uint32_t * fsid;
uint64_t * pguid;
uint32_t written;
/* validation */
if (infolen < sizeof(*statfs))
return NT_STATUS_INFO_LENGTH_MISMATCH;
/* init */
__ntapi->tt_aligned_block_memset(
statfs,0,sizeof(*statfs));
statfs->hfile = hfile;
statfs->dev_name_maxlen = (uint16_t)infolen - sizeof(*statfs);
/* sigh */
if (buffer_size >= 65536)
buffer_size = 65535;
/* maximum component length, file system type */
if ((status = __ntapi->zw_query_volume_information_file(
hfile,
&iosb,
buffer,
buffer_size,
NT_FILE_FS_ATTRIBUTE_INFORMATION)))
return status;
fsai = (nt_fsai *)buffer;
statfs->f_type = 0;
statfs->f_namelen = fsai->maximum_component_name_length;
statfs->nt_fstype_hash = __ntapi->tt_buffer_crc32(
0,&fsai->file_system_name,
fsai->file_system_name_length);
/* max files per volume */
switch (statfs->nt_fstype_hash) {
case NT_FS_TYPE_HPFS_NAME_HASH:
case NT_FS_TYPE_NTFS_NAME_HASH:
case NT_FS_TYPE_SMB_NAME_HASH:
case NT_FS_TYPE_UDF_NAME_HASH:
statfs->f_files = 0xFFFFFFFF;
break;
case NT_FS_TYPE_FAT16_NAME_HASH:
statfs->f_files = 0x10000;
break;
case NT_FS_TYPE_FAT32_NAME_HASH:
statfs->f_files = 0x400000;
break;
default:
/* pretend there is no limitation */
statfs->f_files = (uint64_t)(-1);
break;
}
/* number of free file records on volume */
/* (skip, yet indicate that the volume is not empty) */
statfs->f_ffree = (size_t)statfs->f_files >> 4 << 3;
/* file system size information */
if ((status = __ntapi->zw_query_volume_information_file(
hfile,
&iosb,
buffer,
buffer_size,
NT_FILE_FS_FULL_SIZE_INFORMATION)))
return status;
fsfsi = (nt_fsfsi *)buffer;
statfs->f_blocks = fsfsi->total_allocation_units.quad;
statfs->f_bfree = fsfsi->actual_available_allocation_units.quad;
statfs->f_bavail = fsfsi->caller_available_allocation_units.quad;
statfs->f_bsize = fsfsi->sectors_per_allocation_unit * fsfsi->bytes_per_sector;
statfs->f_frsize = fsfsi->bytes_per_sector;
/* system-unique device name */
if ((status = __ntapi->zw_query_object(
hfile,
NT_OBJECT_NAME_INFORMATION,
buffer,
buffer_size,
&written)))
return status;
sdev = (nt_unicode_string *)buffer;
wch = sdev->buffer;
if (sdev->strlen < __DEVICE_PATH_PREFIX_LEN)
return NT_STATUS_NOT_SUPPORTED;
if ((wch[0] != '\\')
|| (wch[1] != 'D')
|| (wch[2] != 'e')
|| (wch[3] != 'v')
|| (wch[4] != 'i')
|| (wch[5] != 'c')
|| (wch[6] != 'e')
|| (wch[7] != '\\'))
return NT_STATUS_NOT_SUPPORTED;
if (sdev->strlen < __DEVICE_MUP_PREFIX_LEN)
return NT_STATUS_INVALID_HANDLE;
if ((wch[8]=='M')
&& (wch[9]=='u')
&& (wch[10]=='p')
&& (wch[11]=='\\')) {
statfs->nt_drive_letter = 0;
hash = __DEVICE_MUP_PREFIX_HASH;
flags &= ~NT_STATFS_VOLUME_GUID;
statfs->flags |= NT_STATFS_MUP_DEVICE;
wch_mark = &wch[12];
wch = wch_mark;
for (; *wch!='\\'; )
wch++;
wch++;
} else {
wch_mark = &wch[8];
wch = wch_mark;
hash = __DEVICE_PATH_PREFIX_HASH;
}
wch_cap = sdev->buffer + (sdev->strlen / sizeof(wchar16_t));
for (; wch<wch_cap && *wch!='\\'; )
wch++;
statfs->obj_name_strlen = sdev->strlen;
statfs->obj_name_maxlen = statfs->dev_name_maxlen;
statfs->dev_name_strlen = sizeof(uint16_t) * (uint16_t)(wch - sdev->buffer);
statfs->dev_name_hash = __ntapi->tt_buffer_crc32(
hash,wch_mark,
sizeof(wchar16_t) * (wch - wch_mark));
/* device name */
if (!(flags & NT_STATFS_DEV_NAME_COPY))
(void)0;
else if (statfs->dev_name_maxlen < sdev->strlen)
return NT_STATUS_BUFFER_TOO_SMALL;
else
__ntapi->tt_memcpy_utf16(
statfs->dev_name,
sdev->buffer,
sdev->strlen);
/* f_fsid: hash of the system-unique device name */
/* (never use the volume serial number) */
fsid = (uint32_t *)&(statfs->f_fsid);
fsid[0] = statfs->dev_name_hash;
fsid[1] = 0;
/* f_flags, nt_attr */
statfs->f_flags = 0;
statfs->nt_attr = 0;
statfs->nt_padding = 0;
if (!(flags & NT_STATFS_VOLUME_GUID)) {
statfs->nt_drive_letter = 0;
pguid = (uint64_t *)&(statfs->nt_volume_guid);
pguid[0] = 0;
pguid[1] = 0;
return NT_STATUS_SUCCESS;
}
/* dos device letter and volume guid */
wch = (wchar16_t *)sdev->buffer;
mnt_points_buffer = (void *)((uintptr_t)wch + statfs->dev_name_strlen);
*(--wch) = statfs->dev_name_strlen;
offset = sizeof(nt_unicode_string) + statfs->dev_name_strlen;
if ((status = __ntapi->tt_get_dos_drive_mount_points(
0,0,
(nt_mount_dev_name *)wch,
mnt_points_buffer,
buffer_size - offset)))
return status;
offset = ((nt_mount_point_param *)mnt_points_buffer)->mount_points_offset;
mnt_points = (nt_mount_points *)((uintptr_t)mnt_points_buffer + offset);
status = __ntapi->tt_dev_mount_points_to_statfs(
mnt_points,statfs);
return status;
}
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