patch-1.3.22 linux/drivers/scsi/st_options.h

• Lines: 81
• Date: Thu Aug 31 07:44:09 1995
• Orig file: v1.3.21/linux/drivers/scsi/st_options.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.21/linux/drivers/scsi/st_options.h linux/drivers/scsi/st_options.h
@@ -0,0 +1,80 @@
+/*
+   The compile-time configurable defaults for the Linux SCSI tape driver.
+
+   Copyright 1995 Kai Makisara.
+
+   Last modified: Sun Aug 27 22:26:53 1995 by [email protected]
+*/
+
+#ifndef _ST_OPTIONS_H
+#define _ST_OPTIONS_H
+
+/* The driver does not wait for some operations to finish before returning
+   to the user program if ST_NOWAIT is non-zero. This helps if the SCSI
+   adapter does not support multiple outstanding commands. However, the user
+   should not give a new tape command before the previous one has finished. */
+#define ST_NOWAIT 0
+
+/* If ST_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 ST_IN_FILE_POS 0
+
+/* If ST_RECOVERED_WRITE_FATAL is non-zero, recovered errors while writing
+   are considered "hard errors". */
+#define ST_RECOVERED_WRITE_FATAL 0
+
+/* The "guess" for the block size for devices that don't support MODE
+   SENSE. */
+#define ST_DEFAULT_BLOCK 0
+
+/* The tape driver buffer size in kilobytes. */
+#define ST_BUFFER_BLOCKS 32
+
+/* The number of kilobytes of data in the buffer that triggers an
+   asynchronous write in fixed block mode. See also ST_ASYNC_WRITES
+   below. */
+#define ST_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 ST_MAX_BUFFERS (2 + ST_EXTRA_DEVS)
+
+
+/* The following lines define defaults for properties that can be set
+   separately for each drive using the MTSTOPTIONS ioctl. */
+
+/* If ST_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 ST_TWO_FM 0
+
+/* If ST_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 ST_BUFFER_WRITES 1
+
+/* If ST_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 ST_ASYNC_WRITES 1
+
+/* If ST_READ_AHEAD is non-zero, blocks are read ahead in fixed block
+   mode. */
+#define ST_READ_AHEAD 1
+
+/* If ST_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 ST_AUTO_LOCK 0
+
+/* If ST_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 ST_FAST_MTEOM 0
+
+#endif