556 lines
13 KiB
C++
556 lines
13 KiB
C++
/* fhandler_floppy.cc. See fhandler.h for a description of the
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fhandler classes.
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Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
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2009 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include <winioctl.h>
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#include <cygwin/rdevio.h>
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#include <cygwin/hdreg.h>
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#include <cygwin/fs.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "ntdll.h"
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#define IS_EOM(err) ((err) == ERROR_INVALID_PARAMETER \
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|| (err) == ERROR_SEEK \
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|| (err) == ERROR_SECTOR_NOT_FOUND)
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/**********************************************************************/
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/* fhandler_dev_floppy */
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fhandler_dev_floppy::fhandler_dev_floppy ()
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: fhandler_dev_raw (), status ()
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{
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}
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int
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fhandler_dev_floppy::get_drive_info (struct hd_geometry *geo)
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{
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char dbuf[256];
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char pbuf[256];
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DISK_GEOMETRY *di = NULL;
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PARTITION_INFORMATION_EX *pix = NULL;
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PARTITION_INFORMATION *pi = NULL;
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DWORD bytes_read = 0;
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/* Always try using the new EX ioctls first (>= XP). If not available,
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fall back to trying the old non-EX ioctls.
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Unfortunately the EX ioctls are not implemented in the floppy driver. */
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if (wincap.has_disk_ex_ioctls () && get_major () != DEV_FLOPPY_MAJOR)
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{
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if (!DeviceIoControl (get_handle (),
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IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, NULL, 0,
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dbuf, 256, &bytes_read, NULL))
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__seterrno ();
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else
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{
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di = &((DISK_GEOMETRY_EX *) dbuf)->Geometry;
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if (!DeviceIoControl (get_handle (),
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IOCTL_DISK_GET_PARTITION_INFO_EX, NULL, 0,
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pbuf, 256, &bytes_read, NULL))
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__seterrno ();
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else
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pix = (PARTITION_INFORMATION_EX *) pbuf;
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}
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}
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if (!di)
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{
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if (!DeviceIoControl (get_handle (),
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IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
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dbuf, 256, &bytes_read, NULL))
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__seterrno ();
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else
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{
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di = (DISK_GEOMETRY *) dbuf;
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if (!DeviceIoControl (get_handle (),
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IOCTL_DISK_GET_PARTITION_INFO, NULL, 0,
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pbuf, 256, &bytes_read, NULL))
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__seterrno ();
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else
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pi = (PARTITION_INFORMATION *) pbuf;
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}
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}
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if (!di)
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{
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/* Up to Win2K, even IOCTL_DISK_GET_DRIVE_GEOMETRY fails when trying
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it on CD or DVD drives. In that case fall back to requesting
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simple file system information. */
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NTSTATUS status;
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IO_STATUS_BLOCK io;
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FILE_FS_SIZE_INFORMATION ffsi;
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status = NtQueryVolumeInformationFile (get_handle (), &io, &ffsi,
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sizeof ffsi,
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FileFsSizeInformation);
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if (!NT_SUCCESS (status))
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{
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__seterrno_from_nt_status (status);
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return -1;
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}
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debug_printf ("fsys geometry: (%D units)*(%u sec)*(%u bps)",
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ffsi.TotalAllocationUnits.QuadPart,
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ffsi.SectorsPerAllocationUnit,
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ffsi.BytesPerSector);
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bytes_per_sector = ffsi.BytesPerSector;
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drive_size = ffsi.TotalAllocationUnits.QuadPart
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* ffsi.SectorsPerAllocationUnit
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* ffsi.BytesPerSector;
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if (geo)
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{
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geo->heads = 1;
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geo->sectors = ffsi.SectorsPerAllocationUnit;
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geo->cylinders = ffsi.TotalAllocationUnits.LowPart;
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geo->start = 0;
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}
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}
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else
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{
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debug_printf ("disk geometry: (%D cyl)*(%u trk)*(%u sec)*(%u bps)",
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di->Cylinders.QuadPart,
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di->TracksPerCylinder,
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di->SectorsPerTrack,
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di->BytesPerSector);
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bytes_per_sector = di->BytesPerSector;
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if (pix)
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{
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debug_printf ("partition info: offset %D length %D",
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pix->StartingOffset.QuadPart,
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pix->PartitionLength.QuadPart);
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drive_size = pix->PartitionLength.QuadPart;
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}
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else if (pi)
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{
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debug_printf ("partition info: offset %D length %D",
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pi->StartingOffset.QuadPart,
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pi->PartitionLength.QuadPart);
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drive_size = pi->PartitionLength.QuadPart;
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}
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else
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{
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/* Getting the partition size by using the drive geometry information
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looks wrong, but this is a historical necessity. NT4 didn't
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maintain partition information for the whole drive (aka
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"partition 0"), but returned ERROR_INVALID_HANDLE instead. That
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got fixed in W2K. */
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drive_size = di->Cylinders.QuadPart * di->TracksPerCylinder
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* di->SectorsPerTrack * di->BytesPerSector;
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}
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if (geo)
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{
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geo->heads = di->TracksPerCylinder;
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geo->sectors = di->SectorsPerTrack;
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geo->cylinders = di->Cylinders.LowPart;
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if (pix)
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geo->start = pix->StartingOffset.QuadPart >> 9ULL;
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else if (pi)
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geo->start = pi->StartingOffset.QuadPart >> 9ULL;
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else
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geo->start = 0;
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}
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}
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debug_printf ("drive size: %D", drive_size);
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return 0;
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}
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/* Wrapper functions for ReadFile and WriteFile to simplify error handling. */
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BOOL
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fhandler_dev_floppy::read_file (void *buf, DWORD to_read, DWORD *read, int *err)
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{
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BOOL ret;
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*err = 0;
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if (!(ret = ReadFile (get_handle (), buf, to_read, read, 0)))
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*err = GetLastError ();
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syscall_printf ("%d (err %d) = ReadFile (%d, %d, to_read %d, read %d, 0)",
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ret, *err, get_handle (), buf, to_read, *read);
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return ret;
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}
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BOOL
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fhandler_dev_floppy::write_file (const void *buf, DWORD to_write,
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DWORD *written, int *err)
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{
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BOOL ret;
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*err = 0;
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if (!(ret = WriteFile (get_handle (), buf, to_write, written, 0)))
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*err = GetLastError ();
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syscall_printf ("%d (err %d) = WriteFile (%d, %d, write %d, written %d, 0)",
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ret, *err, get_handle (), buf, to_write, *written);
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return ret;
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}
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int
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fhandler_dev_floppy::open (int flags, mode_t)
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{
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/* The correct size of the buffer would be 512 bytes, which is the atomic
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size, supported by WinNT. Unfortunately, the performance is worse than
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access to file system on same device! Setting buffer size to a
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relatively big value increases performance by means. The new ioctl call
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with 'rdevio.h' header file supports changing this value.
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As default buffer size, we're using some value which is a multiple of
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the typical tar and cpio buffer sizes, Except O_DIRECT is set, in which
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case we're not buffering at all. */
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devbufsiz = (flags & O_DIRECT) ? 0L : 61440L;
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int ret = fhandler_dev_raw::open (flags);
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if (ret)
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{
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DWORD bytes_read;
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if (get_drive_info (NULL))
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{
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close ();
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return 0;
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}
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/* If we're trying to access a CD/DVD drive, or an entire disk,
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make sure we're actually allowed to read *all* of the device.
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This is actually documented in the MSDN CreateFile man page. */
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if (get_major () != DEV_FLOPPY_MAJOR
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&& (get_major () == DEV_CDROM_MAJOR || get_minor () == 0)
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&& !DeviceIoControl (get_handle (), FSCTL_ALLOW_EXTENDED_DASD_IO,
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NULL, 0, NULL, 0, &bytes_read, NULL))
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debug_printf ("DeviceIoControl (FSCTL_ALLOW_EXTENDED_DASD_IO) "
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"failed, %E");
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}
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return ret;
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}
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int
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fhandler_dev_floppy::dup (fhandler_base *child)
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{
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int ret = fhandler_dev_raw::dup (child);
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if (!ret)
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{
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fhandler_dev_floppy *fhc = (fhandler_dev_floppy *) child;
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fhc->drive_size = drive_size;
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fhc->bytes_per_sector = bytes_per_sector;
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fhc->eom_detected (eom_detected ());
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}
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return ret;
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}
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inline _off64_t
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fhandler_dev_floppy::get_current_position ()
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{
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LARGE_INTEGER off = { QuadPart: 0LL };
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off.LowPart = SetFilePointer (get_handle (), 0, &off.HighPart, FILE_CURRENT);
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return off.QuadPart;
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}
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void __stdcall
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fhandler_dev_floppy::raw_read (void *ptr, size_t& ulen)
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{
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DWORD bytes_read = 0;
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DWORD read2;
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DWORD bytes_to_read;
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int ret;
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size_t len = ulen;
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char *tgt;
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char *p = (char *) ptr;
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/* Checking a previous end of media */
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if (eom_detected () && !lastblk_to_read ())
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{
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set_errno (ENOSPC);
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goto err;
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}
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if (devbuf)
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{
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while (len > 0)
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{
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if (devbufstart < devbufend)
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{
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bytes_to_read = min (len, devbufend - devbufstart);
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debug_printf ("read %d bytes from buffer (rest %d)",
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bytes_to_read,
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devbufend - devbufstart - bytes_to_read);
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memcpy (p, devbuf + devbufstart, bytes_to_read);
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len -= bytes_to_read;
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p += bytes_to_read;
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bytes_read += bytes_to_read;
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devbufstart += bytes_to_read;
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if (lastblk_to_read ())
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{
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lastblk_to_read (false);
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break;
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}
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}
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if (len > 0)
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{
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if (len >= devbufsiz)
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{
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bytes_to_read = (len / bytes_per_sector) * bytes_per_sector;
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tgt = p;
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}
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else
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{
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tgt = devbuf;
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bytes_to_read = devbufsiz;
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}
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_off64_t current_position = get_current_position ();
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if (current_position + bytes_to_read >= drive_size)
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bytes_to_read = drive_size - current_position;
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if (!bytes_to_read)
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break;
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debug_printf ("read %d bytes from pos %U %s", bytes_to_read,
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current_position,
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len < devbufsiz ? "into buffer" : "directly");
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if (!read_file (tgt, bytes_to_read, &read2, &ret))
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{
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if (!IS_EOM (ret))
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{
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__seterrno ();
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goto err;
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}
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eom_detected (true);
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if (!read2)
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{
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if (!bytes_read)
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{
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debug_printf ("return -1, set errno to ENOSPC");
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set_errno (ENOSPC);
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goto err;
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}
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break;
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}
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lastblk_to_read (true);
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}
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if (!read2)
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break;
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if (tgt == devbuf)
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{
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devbufstart = 0;
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devbufend = read2;
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}
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else
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{
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len -= read2;
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p += read2;
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bytes_read += read2;
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}
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}
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}
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}
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else
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{
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_off64_t current_position = get_current_position ();
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bytes_to_read = len;
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if (current_position + bytes_to_read >= drive_size)
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bytes_to_read = drive_size - current_position;
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debug_printf ("read %d bytes from pos %U directly", bytes_to_read,
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current_position);
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if (bytes_to_read && !read_file (p, bytes_to_read, &bytes_read, &ret))
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{
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if (!IS_EOM (ret))
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{
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__seterrno ();
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goto err;
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}
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if (bytes_read)
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eom_detected (true);
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else
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{
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debug_printf ("return -1, set errno to ENOSPC");
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set_errno (ENOSPC);
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goto err;
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}
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}
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}
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ulen = (size_t) bytes_read;
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return;
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err:
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ulen = (size_t) -1;
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}
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int __stdcall
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fhandler_dev_floppy::raw_write (const void *ptr, size_t len)
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{
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DWORD bytes_written = 0;
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char *p = (char *) ptr;
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int ret;
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/* Checking a previous end of media on tape */
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if (eom_detected ())
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{
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set_errno (ENOSPC);
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return -1;
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}
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/* Invalidate buffer. */
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devbufstart = devbufend = 0;
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if (len > 0)
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{
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if (!write_file (p, len, &bytes_written, &ret))
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{
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if (!IS_EOM (ret))
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{
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__seterrno ();
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return -1;
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}
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eom_detected (true);
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if (!bytes_written)
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{
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set_errno (ENOSPC);
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return -1;
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}
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}
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}
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return bytes_written;
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}
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_off64_t
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fhandler_dev_floppy::lseek (_off64_t offset, int whence)
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{
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char buf[bytes_per_sector];
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_off64_t lloffset = offset;
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_off64_t current_pos = (_off64_t) -1;
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LARGE_INTEGER sector_aligned_offset;
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size_t bytes_left;
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if (whence == SEEK_END)
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{
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lloffset += drive_size;
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whence = SEEK_SET;
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}
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else if (whence == SEEK_CUR)
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{
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current_pos = get_current_position ();
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lloffset += current_pos - (devbufend - devbufstart);
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whence = SEEK_SET;
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}
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if (whence != SEEK_SET || lloffset < 0 || lloffset > drive_size)
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{
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set_errno (EINVAL);
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return -1;
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}
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/* If new position is in buffered range, adjust buffer and return */
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if (devbufstart < devbufend)
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{
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if (current_pos == (_off64_t) -1)
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current_pos = get_current_position ();
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if (current_pos - devbufend <= lloffset && lloffset <= current_pos)
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{
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devbufstart = devbufend - (current_pos - lloffset);
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return lloffset;
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}
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}
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sector_aligned_offset.QuadPart = (lloffset / bytes_per_sector)
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* bytes_per_sector;
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bytes_left = lloffset - sector_aligned_offset.QuadPart;
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/* Invalidate buffer. */
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devbufstart = devbufend = 0;
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sector_aligned_offset.LowPart =
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SetFilePointer (get_handle (),
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sector_aligned_offset.LowPart,
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§or_aligned_offset.HighPart,
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FILE_BEGIN);
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if (sector_aligned_offset.LowPart == INVALID_SET_FILE_POINTER
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&& GetLastError ())
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{
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__seterrno ();
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return -1;
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}
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eom_detected (false);
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if (bytes_left)
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{
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raw_read (buf, bytes_left);
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if (bytes_left == (size_t) -1)
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return -1;
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}
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return sector_aligned_offset.QuadPart + bytes_left;
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}
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int
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fhandler_dev_floppy::ioctl (unsigned int cmd, void *buf)
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{
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DISK_GEOMETRY di;
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DWORD bytes_read;
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switch (cmd)
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{
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case HDIO_GETGEO:
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{
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debug_printf ("HDIO_GETGEO");
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return get_drive_info ((struct hd_geometry *) buf);
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}
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case BLKGETSIZE:
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case BLKGETSIZE64:
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{
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debug_printf ("BLKGETSIZE");
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if (cmd == BLKGETSIZE)
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*(long *)buf = drive_size >> 9UL;
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else
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*(_off64_t *)buf = drive_size;
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return 0;
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}
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case BLKRRPART:
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{
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debug_printf ("BLKRRPART");
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if (!DeviceIoControl (get_handle (),
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IOCTL_DISK_UPDATE_DRIVE_SIZE,
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NULL, 0,
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&di, sizeof (di),
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&bytes_read, NULL))
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{
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__seterrno ();
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return -1;
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}
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get_drive_info (NULL);
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return 0;
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}
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case BLKSSZGET:
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{
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debug_printf ("BLKSSZGET");
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*(int *)buf = bytes_per_sector;
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return 0;
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}
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case RDSETBLK:
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/* Just check the restriction that blocksize must be a multiple
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of the sector size of the underlying volume sector size,
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then fall through to fhandler_dev_raw::ioctl. */
|
|
if (((struct rdop *) buf)->rd_parm % bytes_per_sector)
|
|
{
|
|
SetLastError (ERROR_INVALID_PARAMETER);
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
/*FALLTHRU*/
|
|
default:
|
|
return fhandler_dev_raw::ioctl (cmd, buf);
|
|
}
|
|
}
|
|
|