patch-2.2.19 linux/drivers/scsi/osst_options.h

• Lines: 101
• Date: Sun Mar 25 11:37:36 2001
• Orig file: v2.2.18/drivers/scsi/osst_options.h
• Orig date: Wed Dec 31 19:00:00 1969

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.18/drivers/scsi/osst_options.h linux/drivers/scsi/osst_options.h
@@ -0,0 +1,100 @@
+/*
+   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: /home/cvsroot/Driver/osst_options.h,v 1.4 2000/06/26 01:44:01 riede 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 0
+
+/* 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 30
+
+/* 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  5
+
+
+/* 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. May make detection of End-Of-Medium early enough fail. */
+#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