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newlib-cygwin/winsup/cygwin/fhandler_tape.cc

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/* fhandler_tape.cc. See fhandler.h for a description of the fhandler
classes.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygtls.h"
#include <stdlib.h>
#include <sys/mtio.h>
#include <sys/param.h>
#include <devioctl.h>
#include <ntddstor.h>
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "shared_info.h"
#include "sigproc.h"
#include "child_info.h"
/* Media changes and bus resets are sometimes reported and the function
hasn't been executed. We repeat all functions which return with one
of these error codes. */
#define TAPE_FUNC(func) while ((lasterr = (func)) == ERROR_MEDIA_CHANGED) \
{ \
initialize (drive, false); \
part (partition)->initialize (0); \
}
/* Certain tape drives (known example: QUANTUM_ULTRIUM-HH6) return
ERROR_NOT_READY rather than ERROR_NO_MEDIA_IN_DRIVE if no media
is in the drive. Convert this to the only sane error code. */
#define GET_TAPE_STATUS(_h) ({ \
int _err = GetTapeStatus (_h); \
if (_err == ERROR_NOT_READY) \
_err = ERROR_NO_MEDIA_IN_DRIVE; \
_err; \
})
#define IS_BOT(err) ((err) == ERROR_BEGINNING_OF_MEDIA)
#define IS_EOF(err) ((err) == ERROR_FILEMARK_DETECTED \
|| (err) == ERROR_SETMARK_DETECTED)
#define IS_SM(err) ((err) == ERROR_SETMARK_DETECTED)
#define IS_EOD(err) ((err) == ERROR_END_OF_MEDIA \
|| (err) == ERROR_EOM_OVERFLOW \
|| (err) == ERROR_NO_DATA_DETECTED)
#define IS_EOM(err) ((err) == ERROR_END_OF_MEDIA \
|| (err) == ERROR_EOM_OVERFLOW)
/**********************************************************************/
/* mtinfo_part */
void
mtinfo_part::initialize (int64_t nblock)
{
block = nblock;
if (block == 0)
file = fblock = 0;
else
file = fblock = -1;
smark = false;
emark = no_eof;
}
/**********************************************************************/
/* mtinfo_drive */
void
mtinfo_drive::initialize (int num, bool first_time)
{
drive = num;
partition = 0;
block = -1;
lock = unlocked;
if (first_time)
{
buffer_writes (true);
async_writes (false);
two_fm (false);
fast_eom (false);
auto_lock (false);
sysv (false);
nowait (false);
}
for (int i = 0; i < MAX_PARTITION_NUM; ++i)
part (i)->initialize ();
}
int
mtinfo_drive::get_dp (HANDLE mt)
{
DWORD len = sizeof _dp;
TAPE_FUNC (GetTapeParameters (mt, GET_TAPE_DRIVE_INFORMATION, &len, &_dp));
return error ("get_dp");
}
int
mtinfo_drive::get_mp (HANDLE mt)
{
DWORD len = sizeof _mp;
TAPE_FUNC (GetTapeParameters (mt, GET_TAPE_MEDIA_INFORMATION, &len, &_mp));
/* See GET_TAPE_STATUS comment. */
if (lasterr == ERROR_NOT_READY)
lasterr = ERROR_NO_MEDIA_IN_DRIVE;
return error ("get_mp");
}
int
mtinfo_drive::open (HANDLE mt)
{
/* First access after opening the device can return BUS RESET, but we
need the drive parameters, so just try again. */
while (get_dp (mt) == ERROR_BUS_RESET)
;
get_mp (mt);
get_pos (mt);
if (partition < MAX_PARTITION_NUM && part (partition)->block != block)
part (partition)->initialize (block);
/* The following rewind in position 0 solves a problem which appears
* in case of multi volume archives (at least on NT4): The last ReadFile
* on the previous medium returns ERROR_NO_DATA_DETECTED. After media
* change, all subsequent ReadFile calls return ERROR_NO_DATA_DETECTED,
* too. The call to set_pos apparently reset some internal flags.
* FIXME: Is that really true or based on a misinterpretation? */
if (!block)
{
debug_printf ("rewind in position 0");
set_pos (mt, TAPE_REWIND, 0, false);
}
return error ("open");
}
int
mtinfo_drive::close (HANDLE mt, bool rewind)
{
lasterr = 0;
if (GET_TAPE_STATUS (mt) == ERROR_NO_MEDIA_IN_DRIVE)
dirty = clean;
if (dirty >= has_written)
{
/* If an async write is still pending, wait for completion. */
if (dirty == async_write_pending)
lasterr = async_wait (mt, NULL);
if (!lasterr)
{
/* if last operation was writing, write a filemark */
debug_printf ("writing filemark");
write_marks (mt, TAPE_FILEMARKS, two_fm () ? 2 : 1);
if (two_fm () && !lasterr && !rewind) /* Backspace over 2nd fmark. */
{
set_pos (mt, TAPE_SPACE_FILEMARKS, -1, false);
if (!lasterr)
part (partition)->fblock = 0; /* That's obvious, isn't it? */
}
}
}
else if (dirty == has_read && !rewind)
{
if (sysv ())
{
/* Under SYSV semantics, the tape is moved past the next file mark
after read. */
if (part (partition)->emark == no_eof)
set_pos (mt, TAPE_SPACE_FILEMARKS, 1, false);
else if (part (partition)->emark == eof_hit)
part (partition)->emark = eof;
}
else
{
/* Under BSD semantics, we must check if the filemark has been
inadvertendly crossed. If so cross the filemark backwards
and position the tape right before EOF. */
if (part (partition)->emark == eof_hit)
set_pos (mt, TAPE_SPACE_FILEMARKS, -1, false);
}
}
if (rewind)
{
debug_printf ("rewinding");
set_pos (mt, TAPE_REWIND, 0, false);
}
if (auto_lock () && lock == auto_locked)
prepare (mt, TAPE_UNLOCK);
dirty = clean;
return error ("close");
}
int
mtinfo_drive::read (HANDLE mt, LPOVERLAPPED pov, void *ptr, size_t &ulen)
{
BOOL ret;
DWORD bytes_read = 0;
if (GET_TAPE_STATUS (mt) == ERROR_NO_MEDIA_IN_DRIVE)
return lasterr = ERROR_NO_MEDIA_IN_DRIVE;
if (lasterr == ERROR_BUS_RESET)
{
ulen = 0;
goto out;
}
/* If an async write is still pending, wait for completion. */
if (dirty == async_write_pending)
lasterr = async_wait (mt, NULL);
dirty = clean;
if (part (partition)->emark == eof_hit)
{
part (partition)->emark = eof;
lasterr = ulen = 0;
goto out;
}
else if (part (partition)->emark == eod_hit)
{
part (partition)->emark = eod;
lasterr = ulen = 0;
goto out;
}
else if (part (partition)->emark == eod)
{
lasterr = ERROR_NO_DATA_DETECTED;
ulen = (size_t) -1;
goto out;
}
else if (part (partition)->emark == eom_hit)
{
part (partition)->emark = eom;
lasterr = ulen = 0;
goto out;
}
else if (part (partition)->emark == eom)
{
lasterr = ERROR_END_OF_MEDIA;
ulen = (size_t) -1;
goto out;
}
part (partition)->smark = false;
if (auto_lock () && lock < auto_locked)
prepare (mt, TAPE_LOCK, true);
ov = pov;
ov->Offset = ov->OffsetHigh = 0;
ret = ReadFile (mt, ptr, ulen, &bytes_read, ov);
lasterr = ret ? 0 : GetLastError ();
if (lasterr == ERROR_IO_PENDING)
lasterr = async_wait (mt, &bytes_read);
ulen = (size_t) bytes_read;
if (bytes_read > 0)
{
int32_t blocks_read = mp ()->BlockSize == 0
? 1 : howmany (bytes_read, mp ()->BlockSize);
block += blocks_read;
part (partition)->block += blocks_read;
if (part (partition)->fblock >= 0)
part (partition)->fblock += blocks_read;
}
if (IS_EOF (lasterr))
{
block++;
part (partition)->block++;
if (part (partition)->file >= 0)
part (partition)->file++;
part (partition)->fblock = 0;
part (partition)->smark = IS_SM (lasterr);
part (partition)->emark = bytes_read > 0 ? eof_hit : eof;
lasterr = 0;
}
else if (IS_EOD (lasterr))
{
if (part (partition)->emark == eof)
part (partition)->emark = IS_EOM (lasterr) ? eom : eod;
else
{
part (partition)->emark = IS_EOM (lasterr) ? eom_hit : eod_hit;
lasterr = 0;
}
}
else
{
part (partition)->emark = no_eof;
/* This happens if the buffer is too small when in variable block
size mode. Linux returns ENOMEM here. We're doing the same. */
if (lasterr == ERROR_MORE_DATA)
lasterr = ERROR_NOT_ENOUGH_MEMORY;
}
if (!lasterr)
dirty = has_read;
out:
return error ("read");
}
int
mtinfo_drive::async_wait (HANDLE mt, DWORD *bytes_written)
{
DWORD written;
bool ret = GetOverlappedResult (mt, ov, &written, TRUE);
if (bytes_written)
*bytes_written = written;
return ret ? 0 : GetLastError ();
}
int
mtinfo_drive::write (HANDLE mt, LPOVERLAPPED pov, const void *ptr, size_t &len)
{
BOOL ret;
DWORD bytes_written = 0;
int async_err = 0;
if (GET_TAPE_STATUS (mt) == ERROR_NO_MEDIA_IN_DRIVE)
return lasterr = ERROR_NO_MEDIA_IN_DRIVE;
if (lasterr == ERROR_BUS_RESET)
{
len = 0;
return error ("write");
}
if (dirty == async_write_pending)
async_err = async_wait (mt, &bytes_written);
dirty = clean;
part (partition)->smark = false;
if (auto_lock () && lock < auto_locked)
prepare (mt, TAPE_LOCK, true);
ov = pov;
ov->Offset = ov->OffsetHigh = 0;
ret = WriteFile (mt, ptr, len, &bytes_written, ov);
lasterr = ret ? 0: GetLastError ();
if (lasterr == ERROR_IO_PENDING)
{
if (async_writes () && mp ()->BlockSize == 0)
dirty = async_write_pending;
else
/* Wait for completion if a non-async write. */
lasterr = async_wait (mt, &bytes_written);
}
len = (size_t) bytes_written;
if (bytes_written > 0)
{
int32_t blocks_written = mp ()->BlockSize == 0
? 1 : howmany (bytes_written, mp ()->BlockSize);
block += blocks_written;
part (partition)->block += blocks_written;
if (part (partition)->fblock >= 0)
part (partition)->fblock += blocks_written;
}
if (!lasterr && async_err)
lasterr = async_err;
if (lasterr == ERROR_EOM_OVERFLOW)
part (partition)->emark = eom;
else if (lasterr == ERROR_END_OF_MEDIA)
; // FIXME?: part (partition)->emark = eom_hit;
else
{
part (partition)->emark = no_eof;
if (!lasterr)
dirty = has_written;
else if (lasterr == ERROR_IO_PENDING)
dirty = async_write_pending;
}
return error ("write");
}
int
mtinfo_drive::get_pos (HANDLE mt, int32_t *ppartition, int64_t *pblock)
{
DWORD p;
ULARGE_INTEGER b;
TAPE_FUNC (GetTapePosition (mt, TAPE_LOGICAL_POSITION, &p,
&b.LowPart, &b.HighPart));
if (lasterr == ERROR_INVALID_FUNCTION)
TAPE_FUNC (GetTapePosition (mt, TAPE_ABSOLUTE_POSITION, &p,
&b.LowPart, &b.HighPart));
if (!lasterr)
{
if (p > 0)
partition = (int32_t) p - 1;
block = (int64_t) b.QuadPart;
if (ppartition)
*ppartition= partition;
if (pblock)
*pblock = block;
}
else
{
partition = 0;
block = -1;
}
return error ("get_pos");
}
int
mtinfo_drive::_set_pos (HANDLE mt, int mode, int64_t count, int partition,
BOOL dont_wait)
{
/* If an async write is still pending, wait for completion. */
if (dirty == async_write_pending)
lasterr = async_wait (mt, NULL);
dirty = clean;
LARGE_INTEGER c = { QuadPart:count };
TAPE_FUNC (SetTapePosition (mt, mode, partition, c.LowPart, c.HighPart,
dont_wait));
return lasterr;
}
int
mtinfo_drive::set_pos (HANDLE mt, int mode, int64_t count, bool sfm_func)
{
int err = 0;
int64_t undone = count;
BOOL dont_wait = FALSE;
switch (mode)
{
case TAPE_SPACE_RELATIVE_BLOCKS:
case TAPE_SPACE_FILEMARKS:
case TAPE_SPACE_SETMARKS:
if (!count)
{
lasterr = 0;
goto out;
}
break;
case TAPE_ABSOLUTE_BLOCK:
case TAPE_LOGICAL_BLOCK:
case TAPE_REWIND:
dont_wait = nowait () ? TRUE : FALSE;
break;
}
if (mode == TAPE_SPACE_FILEMARKS)
{
while (!err && undone > 0)
if (!(err = _set_pos (mt, mode, 1, 0, FALSE)) || IS_SM (err))
--undone;
while (!err && undone < 0)
if (!(err = _set_pos (mt, mode, -1, 0, FALSE)) || IS_SM (err))
++undone;
}
else
err = _set_pos (mt, mode, count, 0, dont_wait);
switch (mode)
{
case TAPE_ABSOLUTE_BLOCK:
case TAPE_LOGICAL_BLOCK:
get_pos (mt);
part (partition)->initialize (block);
break;
case TAPE_REWIND:
if (!err)
{
block = 0;
part (partition)->initialize (0);
}
else
{
get_pos (mt);
part (partition)->initialize (block);
}
break;
case TAPE_SPACE_END_OF_DATA:
get_pos (mt);
part (partition)->initialize (block);
part (partition)->emark = IS_EOM (err) ? eom : eod;
break;
case TAPE_SPACE_FILEMARKS:
if (!err || IS_SM (err))
{
get_pos (mt);
part (partition)->block = block;
if (count > 0)
{
if (part (partition)->file >= 0)
part (partition)->file += count - undone;
part (partition)->fblock = 0;
part (partition)->smark = IS_SM (err);
}
else
{
if (part (partition)->file >= 0)
part (partition)->file += count - undone;
part (partition)->fblock = -1;
part (partition)->smark = false;
}
if (sfm_func)
err = set_pos (mt, mode, count > 0 ? -1 : 1, false);
else
part (partition)->emark = count > 0 ? eof : no_eof;
}
else if (IS_EOD (err))
{
get_pos (mt);
part (partition)->block = block;
if (part (partition)->file >= 0)
part (partition)->file += count - undone;
part (partition)->fblock = -1;
part (partition)->smark = false;
part (partition)->emark = IS_EOM (err) ? eom : eod;
}
else if (IS_BOT (err))
{
block = 0;
part (partition)->initialize (0);
}
else
{
get_pos (mt);
part (partition)->initialize (block);
}
break;
case TAPE_SPACE_RELATIVE_BLOCKS:
if (!err)
{
block += count;
part (partition)->block += count;
if (part (partition)->fblock >= 0)
part (partition)->fblock += count;
part (partition)->smark = false;
part (partition)->emark = no_eof;
}
else if (IS_EOF (err))
{
get_pos (mt);
part (partition)->block = block;
if (part (partition)->file >= 0)
part (partition)->file += count > 0 ? 1 : -1;
part (partition)->fblock = count > 0 ? 0 : -1;
part (partition)->smark = (count > 0 && IS_SM (err));
part (partition)->emark = count > 0 ? eof : no_eof;
}
else if (IS_EOD (err))
{
get_pos (mt);
part (partition)->fblock = block - part (partition)->block;
part (partition)->block = block;
part (partition)->smark = false;
part (partition)->emark = IS_EOM (err) ? eom : eod;
}
else if (IS_BOT (err))
{
block = 0;
part (partition)->initialize (0);
}
break;
case TAPE_SPACE_SETMARKS:
get_pos (mt);
part (partition)->block = block;
if (!err)
{
part (partition)->file = -1;
part (partition)->fblock = -1;
part (partition)->smark = true;
}
break;
}
lasterr = err;
out:
return error ("set_pos");
}
int
mtinfo_drive::create_partitions (HANDLE mt, int32_t count)
{
if (dp ()->MaximumPartitionCount <= 1)
return ERROR_INVALID_PARAMETER;
if (set_pos (mt, TAPE_REWIND, 0, false))
goto out;
partition = 0;
part (partition)->initialize (0);
debug_printf ("Format tape with %s partition(s)", count <= 0 ? "one" : "two");
if (get_feature (TAPE_DRIVE_INITIATOR))
{
TAPE_FUNC (CreateTapePartition (mt, TAPE_INITIATOR_PARTITIONS,
count <= 0 ? 0 : 2, (DWORD) count));
}
else if (get_feature (TAPE_DRIVE_SELECT))
{
TAPE_FUNC (CreateTapePartition (mt, TAPE_SELECT_PARTITIONS,
count <= 0 ? 0 : 2, 0));
}
else if (get_feature (TAPE_DRIVE_FIXED))
{
/* This is supposed to work for Tandberg SLR drivers up to version
1.6 which missed to set the TAPE_DRIVE_INITIATOR flag. According
to Tandberg, CreateTapePartition(TAPE_FIXED_PARTITIONS) apparently
does not ignore the dwCount parameter. Go figure! */
TAPE_FUNC (CreateTapePartition (mt, TAPE_FIXED_PARTITIONS,
count <= 0 ? 0 : 2, (DWORD) count));
}
else
lasterr = ERROR_INVALID_PARAMETER;
out:
return error ("partition");
}
int
mtinfo_drive::set_partition (HANDLE mt, int32_t count)
{
if (count < 0 || (uint32_t) count >= MAX_PARTITION_NUM)
lasterr = ERROR_INVALID_PARAMETER;
else if ((DWORD) count >= dp ()->MaximumPartitionCount)
lasterr = ERROR_IO_DEVICE;
else
{
uint64_t part_block = part (count)->block >= 0 ? part (count)->block : 0;
int err = _set_pos (mt, TAPE_LOGICAL_BLOCK, part_block, count + 1, FALSE);
if (err)
{
int64_t sav_block = block;
int32_t sav_partition = partition;
get_pos (mt);
if (sav_partition != partition)
{
if (partition < MAX_PARTITION_NUM
&& part (partition)->block != block)
part (partition)->initialize (block);
}
else if (sav_block != block && partition < MAX_PARTITION_NUM)
part (partition)->initialize (block);
lasterr = err;
}
else
{
partition = count;
if (part (partition)->block == -1)
part (partition)->initialize (0);
}
}
return error ("set_partition");
}
int
mtinfo_drive::write_marks (HANDLE mt, int marktype, DWORD count)
{
/* If an async write is still pending, wait for completion. */
if (dirty == async_write_pending)
{
lasterr = async_wait (mt, NULL);
dirty = has_written;
}
if (marktype != TAPE_SETMARKS)
dirty = clean;
if (marktype == TAPE_FILEMARKS
&& !get_feature (TAPE_DRIVE_WRITE_FILEMARKS))
{
if (get_feature (TAPE_DRIVE_WRITE_LONG_FMKS))
marktype = TAPE_LONG_FILEMARKS;
else
marktype = TAPE_SHORT_FILEMARKS;
}
TAPE_FUNC (WriteTapemark (mt, marktype, count, FALSE));
int err = lasterr;
if (!err)
{
block += count;
part (partition)->block += count;
if (part (partition)->file >= 0)
part (partition)->file += count;
part (partition)->fblock = 0;
part (partition)->emark = eof;
part (partition)->smark = (marktype == TAPE_SETMARKS);
}
else
{
int64_t sav_block = block;
int32_t sav_partition = partition;
get_pos (mt);
if (sav_partition != partition)
{
if (partition < MAX_PARTITION_NUM
&& part (partition)->block != block)
part (partition)->initialize (block);
}
else if (sav_block != block && partition < MAX_PARTITION_NUM)
part (partition)->initialize (block);
lasterr = err;
}
return error ("write_marks");
}
int
mtinfo_drive::erase (HANDLE mt, int mode)
{
switch (mode)
{
case TAPE_ERASE_SHORT:
if (!get_feature (TAPE_DRIVE_ERASE_SHORT))
mode = TAPE_ERASE_LONG;
break;
case TAPE_ERASE_LONG:
if (!get_feature (TAPE_DRIVE_ERASE_LONG))
mode = TAPE_ERASE_SHORT;
break;
}
TAPE_FUNC (EraseTape (mt, mode, nowait () ? TRUE : FALSE));
part (partition)->initialize (0);
return error ("erase");
}
int
mtinfo_drive::prepare (HANDLE mt, int action, bool is_auto)
{
BOOL dont_wait = FALSE;
/* If an async write is still pending, wait for completion. */
if (dirty == async_write_pending)
lasterr = async_wait (mt, NULL);
dirty = clean;
if (action == TAPE_UNLOAD || action == TAPE_LOAD || action == TAPE_TENSION)
dont_wait = nowait () ? TRUE : FALSE;
TAPE_FUNC (PrepareTape (mt, action, dont_wait));
/* Reset buffer after all successful preparations but lock and unlock. */
switch (action)
{
case TAPE_FORMAT:
case TAPE_UNLOAD:
case TAPE_LOAD:
initialize (drive, false);
break;
case TAPE_TENSION:
part (partition)->initialize (0);
break;
case TAPE_LOCK:
lock = lasterr ? lock_error : is_auto ? auto_locked : locked;
break;
case TAPE_UNLOCK:
lock = lasterr ? lock_error : unlocked;
break;
}
return error ("prepare");
}
int
mtinfo_drive::set_compression (HANDLE mt, int32_t count)
{
if (!get_feature (TAPE_DRIVE_SET_COMPRESSION))
return ERROR_INVALID_PARAMETER;
TAPE_SET_DRIVE_PARAMETERS sdp =
{
dp ()->ECC,
(BOOLEAN) (count ? TRUE : FALSE),
dp ()->DataPadding,
dp ()->ReportSetmarks,
dp ()->EOTWarningZoneSize
};
TAPE_FUNC (SetTapeParameters (mt, SET_TAPE_DRIVE_INFORMATION, &sdp));
int err = lasterr;
if (!err)
dp ()->Compression = sdp.Compression;
else
get_dp (mt);
lasterr = err;
return error ("set_compression");
}
int
mtinfo_drive::set_blocksize (HANDLE mt, DWORD count)
{
TAPE_SET_MEDIA_PARAMETERS smp = {count};
TAPE_FUNC (SetTapeParameters (mt, SET_TAPE_MEDIA_INFORMATION, &smp));
/* Make sure to update blocksize info! */
return lasterr ? error ("set_blocksize") : get_mp (mt);
}
int
mtinfo_drive::get_status (HANDLE mt, struct mtget *get)
{
int notape = 0;
DWORD tstat;
if (!get)
return ERROR_INVALID_PARAMETER;
tstat = GET_TAPE_STATUS (mt);
DWORD mpstat = (DWORD) get_mp (mt);
debug_printf ("GetTapeStatus: %u, get_mp: %d", tstat, mpstat);
if (tstat == ERROR_NO_MEDIA_IN_DRIVE || mpstat == ERROR_NO_MEDIA_IN_DRIVE)
notape = 1;
memset (get, 0, sizeof *get);
get->mt_type = MT_ISUNKNOWN;
if (!notape && get_feature (TAPE_DRIVE_SET_BLOCK_SIZE))
get->mt_dsreg = (mp ()->BlockSize << MT_ST_BLKSIZE_SHIFT)
& MT_ST_BLKSIZE_MASK;
else
get->mt_dsreg = (dp ()->DefaultBlockSize << MT_ST_BLKSIZE_SHIFT)
& MT_ST_BLKSIZE_MASK;
DWORD size = sizeof (GET_MEDIA_TYPES) + 10 * sizeof (DEVICE_MEDIA_INFO);
void *buf = alloca (size);
if (DeviceIoControl (mt, IOCTL_STORAGE_GET_MEDIA_TYPES_EX,
NULL, 0, buf, size, &size, NULL)
|| GetLastError () == ERROR_MORE_DATA)
{
PGET_MEDIA_TYPES gmt = (PGET_MEDIA_TYPES) buf;
for (DWORD i = 0; i < gmt->MediaInfoCount; ++i)
{
PDEVICE_MEDIA_INFO dmi = &gmt->MediaInfo[i];
get->mt_type = dmi->DeviceSpecific.TapeInfo.MediaType;
#define TINFO DeviceSpecific.TapeInfo
if (dmi->TINFO.MediaCharacteristics & MEDIA_CURRENTLY_MOUNTED)
{
get->mt_type = dmi->DeviceSpecific.TapeInfo.MediaType;
if (dmi->TINFO.BusType == BusTypeScsi)
get->mt_dsreg |=
(dmi->TINFO.BusSpecificData.ScsiInformation.DensityCode
<< MT_ST_DENSITY_SHIFT)
& MT_ST_DENSITY_MASK;
break;
}
#undef TINFO
}
}
if (!notape)
{
get->mt_resid = (partition & 0xffff)
| ((mp ()->PartitionCount & 0xffff) << 16);
get->mt_fileno = part (partition)->file;
get->mt_blkno = part (partition)->fblock;
if (get->mt_blkno != 0)
/* nothing to do */;
else if (get->mt_fileno == 0)
get->mt_gstat |= GMT_BOT (-1);
else
get->mt_gstat |= GMT_EOF (-1);
if (part (partition)->emark >= eod_hit)
get->mt_gstat |= GMT_EOD (-1);
if (part (partition)->emark >= eom_hit)
get->mt_gstat |= GMT_EOT (-1);
if (part (partition)->smark)
get->mt_gstat |= GMT_SM (-1);
get->mt_gstat |= GMT_ONLINE (-1);
if (mp ()->WriteProtected)
get->mt_gstat |= GMT_WR_PROT (-1);
get->mt_capacity = mp ()->Capacity.QuadPart;
get->mt_remaining = mp ()->Remaining.QuadPart;
}
if (notape)
get->mt_gstat |= GMT_DR_OPEN (-1);
if (buffer_writes ())
get->mt_gstat |= GMT_IM_REP_EN (-1); /* TODO: Async writes */
if (tstat == ERROR_DEVICE_REQUIRES_CLEANING)
get->mt_gstat |= GMT_CLN (-1);
/* Cygwin specials: */
if (dp ()->ReportSetmarks)
get->mt_gstat |= GMT_REP_SM (-1);
if (dp ()->DataPadding)
get->mt_gstat |= GMT_PADDING (-1);
if (dp ()->ECC)
get->mt_gstat |= GMT_HW_ECC (-1);
if (dp ()->Compression)
get->mt_gstat |= GMT_HW_COMP (-1);
if (two_fm ())
get->mt_gstat |= GMT_TWO_FM (-1);
if (fast_eom ())
get->mt_gstat |= GMT_FAST_MTEOM (-1);
if (auto_lock ())
get->mt_gstat |= GMT_AUTO_LOCK (-1);
if (sysv ())
get->mt_gstat |= GMT_SYSV (-1);
if (nowait ())
get->mt_gstat |= GMT_NOWAIT (-1);
if (async_writes ())
get->mt_gstat |= GMT_ASYNC (-1);
get->mt_erreg = 0; /* FIXME: No softerr counting */
get->mt_minblksize = dp ()->MinimumBlockSize;
get->mt_maxblksize = dp ()->MaximumBlockSize;
get->mt_defblksize = dp ()->DefaultBlockSize;
get->mt_featureslow = dp ()->FeaturesLow;
get->mt_featureshigh = dp ()->FeaturesHigh;
get->mt_eotwarningzonesize = dp ()->EOTWarningZoneSize;
return 0;
}
int
mtinfo_drive::set_options (HANDLE mt, int32_t options)
{
int32_t what = (options & MT_ST_OPTIONS);
bool call_setparams = false;
bool set;
TAPE_SET_DRIVE_PARAMETERS sdp =
{
dp ()->ECC,
dp ()->Compression,
dp ()->DataPadding,
dp ()->ReportSetmarks,
dp ()->EOTWarningZoneSize
};
lasterr = 0;
switch (what)
{
case 0:
if (options == 0 || options == 1)
{
buffer_writes ((options == 1));
}
break;
case MT_ST_BOOLEANS:
buffer_writes (!!(options & MT_ST_BUFFER_WRITES));
async_writes (!!(options & MT_ST_ASYNC_WRITES));
two_fm (!!(options & MT_ST_TWO_FM));
fast_eom (!!(options & MT_ST_FAST_MTEOM));
auto_lock (!!(options & MT_ST_AUTO_LOCK));
sysv (!!(options & MT_ST_SYSV));
nowait (!!(options & MT_ST_NOWAIT));
if (get_feature (TAPE_DRIVE_SET_ECC))
sdp.ECC = !!(options & MT_ST_ECC);
if (get_feature (TAPE_DRIVE_SET_PADDING))
sdp.DataPadding = !!(options & MT_ST_PADDING);
if (get_feature (TAPE_DRIVE_SET_REPORT_SMKS))
sdp.ReportSetmarks = !!(options & MT_ST_REPORT_SM);
if (sdp.ECC != dp ()->ECC || sdp.DataPadding != dp ()->DataPadding
|| sdp.ReportSetmarks != dp ()->ReportSetmarks)
call_setparams = true;
break;
case MT_ST_SETBOOLEANS:
case MT_ST_CLEARBOOLEANS:
set = (what == MT_ST_SETBOOLEANS);
if (options & MT_ST_BUFFER_WRITES)
buffer_writes (set);
if (options & MT_ST_ASYNC_WRITES)
async_writes (set);
if (options & MT_ST_TWO_FM)
two_fm (set);
if (options & MT_ST_FAST_MTEOM)
fast_eom (set);
if (options & MT_ST_AUTO_LOCK)
auto_lock (set);
if (options & MT_ST_SYSV)
sysv (set);
if (options & MT_ST_NOWAIT)
nowait (set);
if (options & MT_ST_ECC)
sdp.ECC = set;
if (options & MT_ST_PADDING)
sdp.DataPadding = set;
if (options & MT_ST_REPORT_SM)
sdp.ReportSetmarks = set;
if (sdp.ECC != dp ()->ECC || sdp.DataPadding != dp ()->DataPadding
|| sdp.ReportSetmarks != dp ()->ReportSetmarks)
call_setparams = true;
break;
case MT_ST_EOT_WZ_SIZE:
if (get_feature (TAPE_DRIVE_SET_EOT_WZ_SIZE))
{
sdp.EOTWarningZoneSize = (options & ~MT_ST_OPTIONS);
if (sdp.EOTWarningZoneSize != dp ()->EOTWarningZoneSize)
call_setparams = true;
}
break;
}
if (call_setparams)
{
TAPE_FUNC (SetTapeParameters (mt, SET_TAPE_DRIVE_INFORMATION, &sdp));
int err = lasterr;
if (!err)
{
dp ()->ECC = sdp.ECC;
dp ()->DataPadding = sdp.DataPadding;
dp ()->ReportSetmarks = sdp.ReportSetmarks;
}
else
get_dp (mt);
lasterr = err;
}
return error ("set_options");
}
int
mtinfo_drive::ioctl (HANDLE mt, unsigned int cmd, void *buf)
{
__try
{
if (cmd == MTIOCTOP)
{
struct mtop *op = (struct mtop *) buf;
if (lasterr == ERROR_BUS_RESET)
{
/* If a bus reset occurs, block further access to this device
until the user rewinds, unloads or in any other way tries
to maintain a well-known tape position. */
if (op->mt_op != MTREW && op->mt_op != MTOFFL
&& op->mt_op != MTRETEN && op->mt_op != MTERASE
&& op->mt_op != MTSEEK && op->mt_op != MTEOM)
return ERROR_BUS_RESET;
/* Try to maintain last lock state after bus reset. */
if (lock >= auto_locked && PrepareTape (mt, TAPE_LOCK, FALSE))
{
debug_printf ("Couldn't relock drive after bus reset.");
lock = unlocked;
}
}
switch (op->mt_op)
{
case MTRESET:
break;
case MTFSF:
set_pos (mt, TAPE_SPACE_FILEMARKS, op->mt_count, false);
break;
case MTBSF:
set_pos (mt, TAPE_SPACE_FILEMARKS, -op->mt_count, false);
break;
case MTFSR:
set_pos (mt, TAPE_SPACE_RELATIVE_BLOCKS, op->mt_count, false);
break;
case MTBSR:
set_pos (mt, TAPE_SPACE_RELATIVE_BLOCKS, -op->mt_count, false);
break;
case MTWEOF:
write_marks (mt, TAPE_FILEMARKS, op->mt_count);
break;
case MTREW:
set_pos (mt, TAPE_REWIND, 0, false);
break;
case MTOFFL:
case MTUNLOAD:
prepare (mt, TAPE_UNLOAD);
break;
case MTNOP:
lasterr = 0;
break;
case MTRETEN:
if (!get_feature (TAPE_DRIVE_TENSION))
lasterr = ERROR_INVALID_PARAMETER;
else if (!set_pos (mt, TAPE_REWIND, 0, false))
prepare (mt, TAPE_TENSION);
break;
case MTBSFM:
set_pos (mt, TAPE_SPACE_FILEMARKS, -op->mt_count, true);
break;
case MTFSFM:
set_pos (mt, TAPE_SPACE_FILEMARKS, op->mt_count, true);
break;
case MTEOM:
if (fast_eom () && get_feature (TAPE_DRIVE_END_OF_DATA))
set_pos (mt, TAPE_SPACE_END_OF_DATA, 0, false);
else
set_pos (mt, TAPE_SPACE_FILEMARKS, 32767, false);
break;
case MTERASE:
erase (mt, TAPE_ERASE_LONG);
break;
case MTRAS1:
case MTRAS2:
case MTRAS3:
lasterr = ERROR_INVALID_PARAMETER;
break;
case MTSETBLK:
if (!get_feature (TAPE_DRIVE_SET_BLOCK_SIZE))
{
lasterr = ERROR_INVALID_PARAMETER;
break;
}
if ((DWORD) op->mt_count == mp ()->BlockSize)
{
/* Nothing has changed. */
lasterr = 0;
break;
}
if ((op->mt_count == 0 && !get_feature (TAPE_DRIVE_VARIABLE_BLOCK))
|| (op->mt_count > 0
&& ((DWORD) op->mt_count < dp ()->MinimumBlockSize
|| (DWORD) op->mt_count > dp ()->MaximumBlockSize)))
{
lasterr = ERROR_INVALID_PARAMETER;
break;
}
if (set_blocksize (mt, op->mt_count)
&& lasterr == ERROR_INVALID_FUNCTION)
lasterr = ERROR_INVALID_BLOCK_LENGTH;
break;
case MTSEEK:
if (get_feature (TAPE_DRIVE_LOGICAL_BLK))
set_pos (mt, TAPE_LOGICAL_BLOCK, op->mt_count, false);
else if (!get_pos (mt))
set_pos (mt, TAPE_SPACE_RELATIVE_BLOCKS,
op->mt_count - block, false);
break;
case MTTELL:
if (!get_pos (mt))
op->mt_count = (int) block;
break;
case MTFSS:
set_pos (mt, TAPE_SPACE_SETMARKS, op->mt_count, false);
break;
case MTBSS:
set_pos (mt, TAPE_SPACE_SETMARKS, -op->mt_count, false);
break;
case MTWSM:
write_marks (mt, TAPE_SETMARKS, op->mt_count);
break;
case MTLOCK:
prepare (mt, TAPE_LOCK);
break;
case MTUNLOCK:
prepare (mt, TAPE_UNLOCK);
break;
case MTLOAD:
prepare (mt, TAPE_LOAD);
break;
case MTCOMPRESSION:
set_compression (mt, op->mt_count);
break;
case MTSETPART:
set_partition (mt, op->mt_count);
break;
case MTMKPART:
create_partitions (mt, op->mt_count);
break;
case MTSETDRVBUFFER:
set_options (mt, op->mt_count);
break;
case MTSETDENSITY:
default:
lasterr = ERROR_INVALID_PARAMETER;
break;
}
}
else if (cmd == MTIOCGET)
get_status (mt, (struct mtget *) buf);
else if (cmd == MTIOCPOS && !get_pos (mt))
((struct mtpos *) buf)->mt_blkno = (long) block;
}
__except (NO_ERROR)
{
lasterr = ERROR_NOACCESS;
}
__endtry
return lasterr;
}
/**********************************************************************/
/* mtinfo */
void
mtinfo::initialize ()
{
for (unsigned i = 0; i < MAX_DRIVE_NUM; ++i)
drive (i)->initialize (i, true);
}
/**********************************************************************/
/* fhandler_dev_tape */
#define mt (cygwin_shared->mt)
#define lock(err_ret_val) if (!_lock (false)) return (err_ret_val);
inline bool
fhandler_dev_tape::_lock (bool cancelable)
{
/* O_NONBLOCK is only valid in a read or write call. Only those are
cancelable. */
DWORD timeout = cancelable && is_nonblocking () ? 0 : INFINITE;
switch (cygwait (mt_mtx, timeout,
cw_sig | cw_sig_restart | cw_cancel | cw_cancel_self))
{
case WAIT_OBJECT_0:
return true;
case WAIT_TIMEOUT:
set_errno (EAGAIN);
return false;
default:
__seterrno ();
return false;
}
}
inline int
fhandler_dev_tape::unlock (int ret)
{
ReleaseMutex (mt_mtx);
return ret;
}
fhandler_dev_tape::fhandler_dev_tape ()
: fhandler_dev_raw ()
{
debug_printf ("unit: %d", dev ().get_minor ());
}
int
fhandler_dev_tape::open (int flags, mode_t)
{
int ret;
if (driveno () >= MAX_DRIVE_NUM)
{
set_errno (ENOENT);
return 0;
}
if (!(mt_mtx = CreateMutex (&sec_all, !!(flags & O_CLOEXEC), NULL)))
{
__seterrno ();
return 0;
}
/* The O_SYNC flag is not supported by the tape driver. Use the
MT_ST_BUFFER_WRITES and MT_ST_ASYNC_WRITES flags in the drive
settings instead. In turn, the MT_ST_BUFFER_WRITES is translated
into O_SYNC, which controls the FILE_WRITE_THROUGH flag in the
NtCreateFile call in fhandler_base::open. */
flags &= ~O_SYNC;
if (!mt.drive (driveno ())->buffer_writes ())
flags |= O_SYNC;
ret = fhandler_dev_raw::open (flags);
if (ret)
{
mt.drive (driveno ())->open (get_handle ());
/* In append mode, seek to beginning of next filemark */
if (flags & O_APPEND)
mt.drive (driveno ())->set_pos (get_handle (),
TAPE_SPACE_FILEMARKS, 1, true);
if (!(flags & O_DIRECT))
{
devbufsiz = mt.drive (driveno ())->dp ()->MaximumBlockSize;
devbufalign = 1;
devbufalloc = devbuf = new char [devbufsiz];
}
}
else
ReleaseMutex (mt_mtx);
return ret;
}
int
fhandler_dev_tape::close ()
{
int ret = 0;
int cret = 0;
if (!have_execed)
{
lock (-1);
ret = mt.drive (driveno ())->close (get_handle (), is_rewind_device ());
if (ret)
__seterrno_from_win_error (ret);
cret = fhandler_dev_raw::close ();
unlock (0);
}
if (ov.hEvent)
CloseHandle (ov.hEvent);
CloseHandle (mt_mtx);
return ret ? -1 : cret;
}
void
fhandler_dev_tape::raw_read (void *ptr, size_t &ulen)
{
char *buf = (char *) ptr;
size_t len = ulen;
size_t block_size;
size_t bytes_to_read;
size_t bytes_read = 0;
int ret = 0;
if (lastblk_to_read ())
{
lastblk_to_read (false);
ulen = 0;
return;
}
if (!_lock (true))
{
ulen = (size_t) -1;
return;
}
block_size = mt.drive (driveno ())->mp ()->BlockSize;
if (devbuf)
{
if (devbufend > devbufstart)
{
bytes_to_read = MIN (len, devbufend - devbufstart);
debug_printf ("read %lu bytes from buffer (rest %lu)",
bytes_to_read, devbufend - devbufstart - bytes_to_read);
memcpy (buf, devbuf + devbufstart, bytes_to_read);
len -= bytes_to_read;
bytes_read += bytes_to_read;
buf += bytes_to_read;
devbufstart += bytes_to_read;
if (devbufstart == devbufend)
devbufstart = devbufend = 0;
/* If a switch to variable block_size occured, just return the buffer
remains until the buffer is empty, then proceed with usual variable
block size handling (one block per read call). */
if (!block_size)
len = 0;
}
if (len > 0)
{
if (!ov.hEvent
&& !(ov.hEvent = CreateEvent (&sec_none, TRUE, FALSE, NULL)))
debug_printf ("Creating event failed, %E");
size_t block_fit = !block_size ? len : rounddown(len, block_size);
if (block_fit)
{
debug_printf ("read %lu bytes from tape (rest %lu)",
block_fit, len - block_fit);
ret = mt.drive (driveno ())->read (get_handle (), &ov, buf,
block_fit);
if (ret)
__seterrno_from_win_error (ret);
else if (block_fit)
{
len -= block_fit;
bytes_read += block_fit;
buf += block_fit;
/* Only one block in each read call, please. */
if (!block_size)
len = 0;
}
else {
len = 0;
if (bytes_read)
lastblk_to_read (true);
}
}
if (!ret && len > 0)
{
debug_printf ("read %lu bytes from tape (one block)", block_size);
ret = mt.drive (driveno ())->read (get_handle (), &ov, devbuf,
block_size);
if (ret)
__seterrno_from_win_error (ret);
else if (block_size)
{
devbufstart = len;
devbufend = block_size;
bytes_read += len;
memcpy (buf, devbuf, len);
}
else if (bytes_read)
lastblk_to_read (true);
}
}
}
else
{
if (!ov.hEvent
&& !(ov.hEvent = CreateEvent (&sec_none, TRUE, FALSE, NULL)))
debug_printf ("Creating event failed, %E");
bytes_read = ulen;
ret = mt.drive (driveno ())->read (get_handle (), &ov, ptr, bytes_read);
}
ulen = (ret ? (size_t) -1 : bytes_read);
unlock ();
}
ssize_t
fhandler_dev_tape::raw_write (const void *ptr, size_t len)
{
if (!_lock (true))
return -1;
if (!ov.hEvent && !(ov.hEvent = CreateEvent (&sec_none, TRUE, FALSE, NULL)))
debug_printf ("Creating event failed, %E");
int ret = mt.drive (driveno ())->write (get_handle (), &ov, ptr, len);
if (ret)
__seterrno_from_win_error (ret);
return unlock (ret ? -1 : (int) len);
}
off_t
fhandler_dev_tape::lseek (off_t offset, int whence)
{
#if 1
/* On Linux lseek on tapes is a no-op. For now, let's keep the old code
intact but commented out, should incompatibilities arise. */
return 0;
#else
struct mtop op;
struct mtpos pos;
DWORD block_size;
off_t ret = ILLEGAL_SEEK;
lock (ILLEGAL_SEEK);
debug_printf ("lseek (%s, %D, %d)", get_name (), offset, whence);
block_size = mt.drive (driveno ())->mp ()->BlockSize;
if (block_size == 0)
{
set_errno (EIO);
goto out;
}
if (ioctl (MTIOCPOS, &pos))
goto out;
switch (whence)
{
case SEEK_END:
op.mt_op = MTFSF;
op.mt_count = 1;
if (ioctl (MTIOCTOP, &op))
goto out;
break;
case SEEK_SET:
if (whence == SEEK_SET && offset < 0)
{
set_errno (EINVAL);
goto out;
}
break;
case SEEK_CUR:
break;
default:
set_errno (EINVAL);
goto out;
}
op.mt_op = MTFSR;
op.mt_count = offset / block_size
- (whence == SEEK_SET ? pos.mt_blkno : 0);
if (op.mt_count < 0)
{
op.mt_op = MTBSR;
op.mt_count = -op.mt_count;
}
if (ioctl (MTIOCTOP, &op) || ioctl (MTIOCPOS, &pos))
goto out;
ret = pos.mt_blkno * block_size;
out:
return unlock (ret);
#endif
}
int
fhandler_dev_tape::fstat (struct stat *buf)
{
int ret;
if (driveno () >= MAX_DRIVE_NUM)
{
set_errno (ENOENT);
return -1;
}
if (!(ret = fhandler_base::fstat (buf)))
buf->st_blocks = 0;
return ret;
}
int
fhandler_dev_tape::dup (fhandler_base *child, int flags)
{
lock (-1);
fhandler_dev_tape *fh = (fhandler_dev_tape *) child;
if (!DuplicateHandle (GetCurrentProcess (), mt_mtx,
GetCurrentProcess (), &fh->mt_mtx,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
debug_printf ("dup(%s) failed, mutex handle %p, %E",
get_name (), mt_mtx);
__seterrno ();
return unlock (-1);
}
fh->ov.hEvent = NULL;
if (ov.hEvent &&
!DuplicateHandle (GetCurrentProcess (), ov.hEvent,
GetCurrentProcess (), &fh->ov.hEvent,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
debug_printf ("dup(%s) failed, event handle %p, %E",
get_name (), ov.hEvent);
__seterrno ();
return unlock (-1);
}
return unlock (fhandler_dev_raw::dup (child, flags));
}
void
fhandler_dev_tape::fixup_after_fork (HANDLE parent)
{
fhandler_dev_raw::fixup_after_fork (parent);
fork_fixup (parent, mt_mtx, "mt_mtx");
if (ov.hEvent)
fork_fixup (parent, ov.hEvent, "ov.hEvent");
}
void
fhandler_dev_tape::set_close_on_exec (bool val)
{
fhandler_dev_raw::set_close_on_exec (val);
set_no_inheritance (mt_mtx, val);
if (ov.hEvent)
set_no_inheritance (ov.hEvent, val);
}
int
fhandler_dev_tape::ioctl (unsigned int cmd, void *buf)
{
int ret = 0;
lock (-1);
if (cmd == MTIOCTOP || cmd == MTIOCGET || cmd == MTIOCPOS)
{
ret = mt.drive (driveno ())->ioctl (get_handle (), cmd, buf);
if (ret)
__seterrno_from_win_error (ret);
return unlock (ret ? -1 : 0);
}
return unlock (fhandler_dev_raw::ioctl (cmd, buf));
}
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