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[SCSI] st: add MTWEOFI to write filemarks without flushing drive buffer

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This patch adds a new MTIOCTOP operation MTWEOFI that writes filemarks with
immediate bit set. This means that the drive does not flush its buffer and the
next file can be started immediately. This speeds up writing in applications
that have to write multiple small files.

Signed-off-by: Kai Makisara <kai.makisara@kolumbus.fi>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Kai Makisara
2010-10-09 00:17:56 +03:00
committed by James Bottomley
parent 56dd2c0691
commit 3e51d3c924
3 changed files with 24 additions and 7 deletions
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include/linux/mtio.h
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@ -63,6 +63,7 @@ struct mtop {
#define MTCOMPRESSION 32/* control compression with SCSI mode page 15 */
#define MTSETPART 33 /* Change the active tape partition */
#define MTMKPART 34 /* Format the tape with one or two partitions */
#define MTWEOFI 35 /* write an end-of-file record (mark) in immediate mode */
/* structure for MTIOCGET - mag tape get status command */