Lines Matching +full:user +full:- +full:defined
1 .. SPDX-License-Identifier: GPL-2.0
21 1. Each user can specify the tape parameters he/she wants to use
23 flexible method and applicable to single-user workstations. However,
24 in a multiuser environment the next user finds the tape parameters in
25 state the previous user left them.
32 drive performs auto-detection of the tape format well (like some
33 QIC-drives). The result is that any tape can be read, writing can be
37 does not perform auto-detection well enough and there is a single
40 or not :-).
42 The user can override the parameters defined by the system
46 3. By default, up to four modes can be defined and selected using the minor
49 above. Additional modes are dormant until they are defined by the
57 between formats in multi-tape operations (the explicitly overridden
72 limits). Both the auto-rewind (minor equals device number) and
73 non-rewind devices (minor is 128 + device number) are implemented.
77 tape block and returns to the user the data if the read() byte count
109 The compile options are defined in the file linux/drivers/scsi/st_options.h.
128 dev_upper non-rew mode dev-lower
129 20 - 8 7 6 5 4 0
131 The non-rewind bit is always bit 7 (the uppermost bit in the lowermost
132 byte). The bits defining the mode are below the non-rewind bit. The
143 and non-rewind entries for each mode. The names are stxy and nstxy, where x
149 default_density defined dev device driver. The file 'defined' contains 1
150 if the mode is defined and zero if not defined. The files 'default_*' contain
151 the defaults set by the user. The value -1 means the default is not set. The
161 directory corresponding to the mode 0 auto-rewind device (e.g., st0).
174 regular expression "^st[0-9]+$"
186 - The number of I/Os currently outstanding to this device.
188 - The amount of time spent waiting (in nanoseconds) for all I/O
193 - The number of I/Os issued to the tape drive other than read or
195 following calculation io_ms-read_ms-write_ms.
197 - The number of bytes read from the tape drive.
199 - The number of read requests issued to the tape drive.
201 - The amount of time (in nanoseconds) spent waiting for read
204 - The number of bytes written to the tape drive.
206 - The number of write requests issued to the tape drive.
208 - The amount of time (in nanoseconds) spent waiting for write
211 - The number of times during a read or write we found
212 the residual amount to be non-zero. This should mean that a program
239 The user can choose between these two behaviours of the tape driver by
251 The driver tries to do transfers directly to/from user space. If this
252 is not possible, a driver buffer allocated at run-time is used. If
257 - one or more pages are at addresses not reachable by the HBA
258 - the number of pages in the transfer exceeds the number of
260 - one or more pages can't be locked into memory (should not happen in
264 block mode, the minimum buffer size is defined (in 1024 byte units) by
268 allowed if ST_BUFFER_WRITES is non-zero and direct i/o is not used.
275 -b option) may have had good throughput but this is not true any more with
277 is to use bigger write() byte counts (e.g., tar -b 64).
286 tape after the early-warning mark to flush the driver buffer.
289 attempted even if the user does not want to get all of the data at
293 Scatter/gather buffers (buffers that consist of chunks non-contiguous
312 are used to extend the buffer at run-time if this is necessary. The
325 returns -1 and errno is set to ENOSPC. To enable writing a trailer,
327 bytes is returned. After this, -1 and the number of bytes are
343 try_direct_io=x try direct transfer between user buffer and
344 tape drive if this is non-zero
348 set, the write threshold is set to the new buffer size - 2 kB.
363 the driver as module. If several parameters are set, the keyword-value
376 - aa is the buffer size for fixed block mode in 1024 byte units
377 - bb is the write threshold in 1024 byte units
378 - dd is the maximum number of scatter/gather segments
385 defined in mtio.h The tape control program 'mt' uses these ioctls. Try
388 (look for a package mt-st* from the Linux ftp sites; the GNU mt does
426 Re-tension tape.
434 Seek to tape block count. Uses Tandberg-compatible seek (QFA)
435 for SCSI-1 drives and SCSI-2 seek for SCSI-2 drives. The file and
469 partitions (argument non-zero). If the argument is positive,
475 LTO drives from LTO-5 upwards. The drive has to support partitions
519 the MTSEEK and MTIOCPOS for SCSI-2 drives instead of
560 contains the new default. If the bits 8-15 are set to a
561 non-zero number, and this number is not 0xff, the number is
581 cleaning. The bits are device-dependent. The driver is
583 bits of the argument; must be >= 18 (values 1 - 17
585 a mask to select the relevant bits (the bits 9-16), and the
586 bit pattern (bits 17-23). If the bit pattern is zero, one
588 the pattern is non-zero, the pattern must match the masked
599 Tandberg-compatible QFA for SCSI-1 drives and the SCSI-2
600 command for the SCSI-2 drives.
607 block is -1 when it can't be determined (e.g., after MTBSF).
623 is defined.
630 defining ST_NOWAIT. If this is defined, the user should take care that
638 correct. The user can request using direct spacing to EOD by setting
645 within file can be obtained if ST_IN_FILE_POS is defined at compile
648 user does not request data that far.)
663 the driver is waiting. With the command 'ps -l' you can see the state