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authorKai Makisara <Kai.Makisara@kolumbus.fi>2010-10-09 00:17:56 +0300
committerJames Bottomley <James.Bottomley@suse.de>2010-10-08 17:16:22 -0500
commit3e51d3c924aea8a1f1372e6c615b0a37b528121d (patch)
tree16cdd955fc95e4e1ca28faaac6524e51e0c271d4 /drivers/scsi/st.c
parent56dd2c0691a5a387b7b05835fe547dc6fade9407 (diff)
downloadop-kernel-dev-3e51d3c924aea8a1f1372e6c615b0a37b528121d.zip
op-kernel-dev-3e51d3c924aea8a1f1372e6c615b0a37b528121d.tar.gz
[SCSI] st: add MTWEOFI to write filemarks without flushing drive buffer
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>
Diffstat (limited to 'drivers/scsi/st.c')
-rw-r--r--drivers/scsi/st.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 24211d0..9e2c3a7 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -9,7 +9,7 @@
Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
Michael Schaefer, J"org Weule, and Eric Youngdale.
- Copyright 1992 - 2008 Kai Makisara
+ Copyright 1992 - 2010 Kai Makisara
email Kai.Makisara@kolumbus.fi
Some small formal changes - aeb, 950809
@@ -17,7 +17,7 @@
Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*/
-static const char *verstr = "20081215";
+static const char *verstr = "20100829";
#include <linux/module.h>
@@ -2696,18 +2696,21 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
}
break;
case MTWEOF:
+ case MTWEOFI:
case MTWSM:
if (STp->write_prot)
return (-EACCES);
cmd[0] = WRITE_FILEMARKS;
if (cmd_in == MTWSM)
cmd[1] = 2;
+ if (cmd_in == MTWEOFI)
+ cmd[1] |= 1;
cmd[2] = (arg >> 16);
cmd[3] = (arg >> 8);
cmd[4] = arg;
timeout = STp->device->request_queue->rq_timeout;
DEBC(
- if (cmd_in == MTWEOF)
+ if (cmd_in != MTWSM)
printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
else
@@ -2883,8 +2886,8 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
else if (chg_eof)
STps->eof = ST_NOEOF;
- if (cmd_in == MTWEOF)
- STps->rw = ST_IDLE;
+ if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
+ STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
} else { /* SCSI command was not completely successful. Don't return
from this block without releasing the SCSI command block! */
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
@@ -2901,7 +2904,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
else
undone = 0;
- if (cmd_in == MTWEOF &&
+ if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
cmdstatp->have_sense &&
(cmdstatp->flags & SENSE_EOM)) {
if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
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