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/* mtinfo.h: Defininitions for the Cygwin tape driver class.
Copyright 2004, 2005, 2006, 2008, 2012, 2013 Red Hat, Inc.
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. */
/* Maximum number of supported partitions per drive. */
#define MAX_PARTITION_NUM 64
/* Maximum number of supported drives. */
#define MAX_DRIVE_NUM 8
/* Values for bookkeeping of the tape position relative to filemarks
and eod/eom. */
enum eom_val
{
no_eof,
eof_hit,
eof,
eod_hit,
eod,
eom_hit,
eom
};
enum dirty_state
{
clean,
has_read,
has_written,
async_write_pending
};
enum lock_state
{
unlocked,
lock_error,
auto_locked,
locked
};
/* Partition specific information */
class mtinfo_part
{
public:
int64_t block; /* logical block no */
int64_t fblock; /* relative block no */
int32_t file; /* current file no */
bool smark; /* At setmark? */
eom_val emark; /* "end-of"-mark */
void initialize (int64_t nblock = -1);
};
class mtinfo_drive
{
int drive;
int lasterr;
int32_t partition;
int64_t block;
dirty_state dirty;
lock_state lock;
TAPE_GET_DRIVE_PARAMETERS _dp;
TAPE_GET_MEDIA_PARAMETERS _mp;
/* sizeof(OVERLAPPED) == 20 on 32 bit, 32 on 64 bit. A drive is always
opened exclusively by a single process, though, so instead of the
OVERLAPPED structure, we just keep track of the pointer to the
OVERLAPPED structure in the application's fhandler. */
LPOVERLAPPED ov;
struct status_flags
{
unsigned buffer_writes : 1;
unsigned async_writes : 1;
unsigned two_fm : 1;
unsigned fast_eom : 1;
unsigned auto_lock : 1;
unsigned sysv : 1;
unsigned nowait : 1;
} status;
mtinfo_part _part[MAX_PARTITION_NUM];
inline int error (const char *str)
{
if (lasterr)
debug_printf ("%s: Win32 error %d", str, lasterr);
return lasterr;
}
inline bool get_feature (DWORD parm)
{
return ((parm & TAPE_DRIVE_HIGH_FEATURES)
? ((_dp.FeaturesHigh & parm) != 0)
: ((_dp.FeaturesLow & parm) != 0));
}
int get_pos (HANDLE mt, int32_t *ppartition = NULL, int64_t *pblock = NULL);
int _set_pos (HANDLE mt, int mode, int64_t count, int partition, BOOL dont_wait);
int create_partitions (HANDLE mt, int32_t count);
int set_partition (HANDLE mt, int32_t count);
int write_marks (HANDLE mt, int marktype, DWORD count);
int erase (HANDLE mt, int mode);
int prepare (HANDLE mt, int action, bool is_auto = false);
int set_compression (HANDLE mt, int32_t count);
int set_blocksize (HANDLE mt, DWORD count);
int get_status (HANDLE mt, struct mtget *get);
int set_options (HANDLE mt, int32_t options);
int async_wait (HANDLE mt, DWORD *bytes_written);
public:
void initialize (int num, bool first_time);
int get_dp (HANDLE mt);
int get_mp (HANDLE mt);
int open (HANDLE mt);
int close (HANDLE mt, bool rewind);
int read (HANDLE mt, LPOVERLAPPED pov, void *ptr, size_t &ulen);
int write (HANDLE mt, LPOVERLAPPED pov, const void *ptr, size_t &len);
int ioctl (HANDLE mt, unsigned int cmd, void *buf);
int set_pos (HANDLE mt, int mode, int64_t count, bool sfm_func);
IMPLEMENT_STATUS_FLAG (bool, buffer_writes)
IMPLEMENT_STATUS_FLAG (bool, async_writes)
IMPLEMENT_STATUS_FLAG (bool, two_fm)
IMPLEMENT_STATUS_FLAG (bool, fast_eom)
IMPLEMENT_STATUS_FLAG (bool, auto_lock)
IMPLEMENT_STATUS_FLAG (bool, sysv)
IMPLEMENT_STATUS_FLAG (bool, nowait)
PTAPE_GET_DRIVE_PARAMETERS dp () { return &_dp; }
PTAPE_GET_MEDIA_PARAMETERS mp () { return &_mp; }
mtinfo_part *part (int num) { return &_part[num]; }
};
class mtinfo
{
mtinfo_drive _drive[MAX_DRIVE_NUM];
public:
void initialize ();
mtinfo_drive *drive (int num) { return &_drive[num]; }
};
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