mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 08:36:47 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
107 lines
4.1 KiB
C
107 lines
4.1 KiB
C
/*
|
|
The compile-time configurable defaults for the Linux SCSI tape driver.
|
|
|
|
Copyright 1995 Kai Makisara.
|
|
|
|
Last modified: Wed Sep 2 21:24:07 1998 by root@home
|
|
|
|
Changed (and renamed) for OnStream SCSI drives garloff@suse.de
|
|
2000-06-21
|
|
|
|
$Header: /cvsroot/osst/Driver/osst_options.h,v 1.6 2003/12/23 14:22:12 wriede Exp $
|
|
*/
|
|
|
|
#ifndef _OSST_OPTIONS_H
|
|
#define _OSST_OPTIONS_H
|
|
|
|
/* The minimum limit for the number of SCSI tape devices is determined by
|
|
OSST_MAX_TAPES. If the number of tape devices and the "slack" defined by
|
|
OSST_EXTRA_DEVS exceeds OSST_MAX_TAPES, the large number is used. */
|
|
#define OSST_MAX_TAPES 4
|
|
|
|
/* If OSST_IN_FILE_POS is nonzero, the driver positions the tape after the
|
|
record been read by the user program even if the tape has moved further
|
|
because of buffered reads. Should be set to zero to support also drives
|
|
that can't space backwards over records. NOTE: The tape will be
|
|
spaced backwards over an "accidentally" crossed filemark in any case. */
|
|
#define OSST_IN_FILE_POS 1
|
|
|
|
/* The tape driver buffer size in kilobytes. */
|
|
/* Don't change, as this is the HW blocksize */
|
|
#define OSST_BUFFER_BLOCKS 32
|
|
|
|
/* The number of kilobytes of data in the buffer that triggers an
|
|
asynchronous write in fixed block mode. See also OSST_ASYNC_WRITES
|
|
below. */
|
|
#define OSST_WRITE_THRESHOLD_BLOCKS 32
|
|
|
|
/* OSST_EOM_RESERVE defines the number of frames are kept in reserve for
|
|
* * write error recovery when writing near end of medium. ENOSPC is returned
|
|
* * when write() is called and the tape write position is within this number
|
|
* * of blocks from the tape capacity. */
|
|
#define OSST_EOM_RESERVE 300
|
|
|
|
/* The maximum number of tape buffers the driver allocates. The number
|
|
is also constrained by the number of drives detected. Determines the
|
|
maximum number of concurrently active tape drives. */
|
|
#define OSST_MAX_BUFFERS OSST_MAX_TAPES
|
|
|
|
/* Maximum number of scatter/gather segments */
|
|
/* Fit one buffer in pages and add one for the AUX header */
|
|
#define OSST_MAX_SG (((OSST_BUFFER_BLOCKS*1024) / PAGE_SIZE) + 1)
|
|
|
|
/* The number of scatter/gather segments to allocate at first try (must be
|
|
smaller or equal to the maximum). */
|
|
#define OSST_FIRST_SG ((OSST_BUFFER_BLOCKS*1024) / PAGE_SIZE)
|
|
|
|
/* The size of the first scatter/gather segments (determines the maximum block
|
|
size for SCSI adapters not supporting scatter/gather). The default is set
|
|
to try to allocate the buffer as one chunk. */
|
|
#define OSST_FIRST_ORDER (15-PAGE_SHIFT)
|
|
|
|
|
|
/* The following lines define defaults for properties that can be set
|
|
separately for each drive using the MTSTOPTIONS ioctl. */
|
|
|
|
/* If OSST_TWO_FM is non-zero, the driver writes two filemarks after a
|
|
file being written. Some drives can't handle two filemarks at the
|
|
end of data. */
|
|
#define OSST_TWO_FM 0
|
|
|
|
/* If OSST_BUFFER_WRITES is non-zero, writes in fixed block mode are
|
|
buffered until the driver buffer is full or asynchronous write is
|
|
triggered. */
|
|
#define OSST_BUFFER_WRITES 1
|
|
|
|
/* If OSST_ASYNC_WRITES is non-zero, the SCSI write command may be started
|
|
without waiting for it to finish. May cause problems in multiple
|
|
tape backups. */
|
|
#define OSST_ASYNC_WRITES 1
|
|
|
|
/* If OSST_READ_AHEAD is non-zero, blocks are read ahead in fixed block
|
|
mode. */
|
|
#define OSST_READ_AHEAD 1
|
|
|
|
/* If OSST_AUTO_LOCK is non-zero, the drive door is locked at the first
|
|
read or write command after the device is opened. The door is opened
|
|
when the device is closed. */
|
|
#define OSST_AUTO_LOCK 0
|
|
|
|
/* If OSST_FAST_MTEOM is non-zero, the MTEOM ioctl is done using the
|
|
direct SCSI command. The file number status is lost but this method
|
|
is fast with some drives. Otherwise MTEOM is done by spacing over
|
|
files and the file number status is retained. */
|
|
#define OSST_FAST_MTEOM 0
|
|
|
|
/* If OSST_SCSI2LOGICAL is nonzero, the logical block addresses are used for
|
|
MTIOCPOS and MTSEEK by default. Vendor addresses are used if OSST_SCSI2LOGICAL
|
|
is zero. */
|
|
#define OSST_SCSI2LOGICAL 0
|
|
|
|
/* If OSST_SYSV is non-zero, the tape behaves according to the SYS V semantics.
|
|
The default is BSD semantics. */
|
|
#define OSST_SYSV 0
|
|
|
|
|
|
#endif
|