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cciss: add cciss_tape_cmds module paramter

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This is to allow number of commands reserved for use by SCSI tape drives
and medium changers to be adjusted at driver load time via the kernel
parameter cciss_tape_cmds, with a default value of 6, and a range
of 2 - 16 inclusive.  Previously, the driver limited the number of
commands which could be queued to the SCSI half of the the driver
to only 2.  This is to fix the problem that if you had more than
two tape drives, you couldn't, for example, erase or rewind them all
at the same time.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Stephen M. Cameron
2011-05-03 14:54:12 -05:00
committed by Jens Axboe
parent 063d2cf72a
commit 8a4ec67bd5
4 changed files with 48 additions and 23 deletions
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drivers/block/cciss_scsi.h
-4
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@@ -36,13 +36,9 @@
addressible natively, and may in fact turn
out to be not scsi at all. */
#define SCSI_CCISS_CAN_QUEUE 2
/*
Note, cmd_per_lun could give us some trouble, so I'm setting it very low.
Likewise, SCSI_CCISS_CAN_QUEUE is set very conservatively.
If the upper scsi layer tries to track how many commands we have
outstanding, it will be operating under the misapprehension that it is
the only one sending us requests. We also have the block interface,