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105 lines
3.9 KiB
105 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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The compile-time configurable defaults for the Linux SCSI tape driver. |
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Copyright 1995-2003 Kai Makisara. |
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Last modified: Thu Feb 21 21:47:07 2008 by kai.makisara |
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*/ |
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#ifndef _ST_OPTIONS_H |
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#define _ST_OPTIONS_H |
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/* If TRY_DIRECT_IO is non-zero, the driver tries to transfer data directly |
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between the user buffer and tape drive. If this is not possible, driver |
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buffer is used. If TRY_DIRECT_IO is zero, driver buffer is always used. */ |
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#define TRY_DIRECT_IO 1 |
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/* The driver does not wait for some operations to finish before returning |
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to the user program if ST_NOWAIT is non-zero. This helps if the SCSI |
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adapter does not support multiple outstanding commands. However, the user |
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should not give a new tape command before the previous one has finished. */ |
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#define ST_NOWAIT 0 |
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/* If ST_IN_FILE_POS is nonzero, the driver positions the tape after the |
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record been read by the user program even if the tape has moved further |
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because of buffered reads. Should be set to zero to support also drives |
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that can't space backwards over records. NOTE: The tape will be |
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spaced backwards over an "accidentally" crossed filemark in any case. */ |
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#define ST_IN_FILE_POS 0 |
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/* If ST_RECOVERED_WRITE_FATAL is non-zero, recovered errors while writing |
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are considered "hard errors". */ |
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#define ST_RECOVERED_WRITE_FATAL 0 |
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/* The "guess" for the block size for devices that don't support MODE |
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SENSE. */ |
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#define ST_DEFAULT_BLOCK 0 |
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/* The minimum tape driver buffer size in kilobytes in fixed block mode. |
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Must be non-zero. */ |
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#define ST_FIXED_BUFFER_BLOCKS 32 |
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/* Maximum number of scatter/gather segments */ |
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#define ST_MAX_SG 256 |
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/* The number of scatter/gather segments to allocate at first try (must be |
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smaller or equal to the maximum). */ |
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#define ST_FIRST_SG 8 |
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/* The size of the first scatter/gather segments (determines the maximum block |
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size for SCSI adapters not supporting scatter/gather). The default is set |
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to try to allocate the buffer as one chunk. */ |
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#define ST_FIRST_ORDER 5 |
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/* The following lines define defaults for properties that can be set |
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separately for each drive using the MTSTOPTIONS ioctl. */ |
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/* If ST_TWO_FM is non-zero, the driver writes two filemarks after a |
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file being written. Some drives can't handle two filemarks at the |
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end of data. */ |
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#define ST_TWO_FM 0 |
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/* If ST_BUFFER_WRITES is non-zero, writes in fixed block mode are |
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buffered until the driver buffer is full or asynchronous write is |
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triggered. May make detection of End-Of-Medium early enough fail. */ |
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#define ST_BUFFER_WRITES 1 |
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/* If ST_ASYNC_WRITES is non-zero, the SCSI write command may be started |
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without waiting for it to finish. May cause problems in multiple |
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tape backups. */ |
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#define ST_ASYNC_WRITES 1 |
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/* If ST_READ_AHEAD is non-zero, blocks are read ahead in fixed block |
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mode. */ |
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#define ST_READ_AHEAD 1 |
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/* If ST_AUTO_LOCK is non-zero, the drive door is locked at the first |
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read or write command after the device is opened. The door is opened |
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when the device is closed. */ |
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#define ST_AUTO_LOCK 0 |
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/* If ST_FAST_MTEOM is non-zero, the MTEOM ioctl is done using the |
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direct SCSI command. The file number status is lost but this method |
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is fast with some drives. Otherwise MTEOM is done by spacing over |
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files and the file number status is retained. */ |
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#define ST_FAST_MTEOM 0 |
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/* If ST_SCSI2LOGICAL is nonzero, the logical block addresses are used for |
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MTIOCPOS and MTSEEK by default. Vendor addresses are used if ST_SCSI2LOGICAL |
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is zero. */ |
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#define ST_SCSI2LOGICAL 0 |
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/* If ST_SYSV is non-zero, the tape behaves according to the SYS V semantics. |
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The default is BSD semantics. */ |
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#define ST_SYSV 0 |
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/* If ST_SILI is non-zero, the SILI bit is set when reading in variable block |
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mode and the block size is determined using the residual returned by the HBA. */ |
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#define ST_SILI 0 |
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/* Time to wait for the drive to become ready if blocking open */ |
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#define ST_BLOCK_SECONDS 120 |
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#endif
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