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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/scsi/st_options.h
Initial import
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+/*
+ The compile-time configurable defaults for the Linux SCSI tape driver.
+
+ Copyright 1995-2003 Kai Makisara.
+
+ Last modified: Thu Feb 21 21:47:07 2008 by kai.makisara
+*/
+
+#ifndef _ST_OPTIONS_H
+#define _ST_OPTIONS_H
+
+/* If TRY_DIRECT_IO is non-zero, the driver tries to transfer data directly
+ between the user buffer and tape drive. If this is not possible, driver
+ buffer is used. If TRY_DIRECT_IO is zero, driver buffer is always used. */
+#define TRY_DIRECT_IO 1
+
+/* 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 minimum tape driver buffer size in kilobytes in fixed block mode.
+ Must be non-zero. */
+#define ST_FIXED_BUFFER_BLOCKS 32
+
+/* Maximum number of scatter/gather segments */
+#define ST_MAX_SG 256
+
+/* The number of scatter/gather segments to allocate at first try (must be
+ smaller or equal to the maximum). */
+#define ST_FIRST_SG 8
+
+/* 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 ST_FIRST_ORDER 5
+
+
+/* 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
+
+/* If ST_SCSI2LOGICAL is nonzero, the logical block addresses are used for
+ MTIOCPOS and MTSEEK by default. Vendor addresses are used if ST_SCSI2LOGICAL
+ is zero. */
+#define ST_SCSI2LOGICAL 0
+
+/* If ST_SYSV is non-zero, the tape behaves according to the SYS V semantics.
+ The default is BSD semantics. */
+#define ST_SYSV 0
+
+/* If ST_SILI is non-zero, the SILI bit is set when reading in variable block
+ mode and the block size is determined using the residual returned by the HBA. */
+#define ST_SILI 0
+
+/* Time to wait for the drive to become ready if blocking open */
+#define ST_BLOCK_SECONDS 120
+
+#endif