From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Sat, 4 Oct 2008 18:11:35 +0000 (-0400)
Subject: [SCSI] export busy state via q->lld_busy_fn()
X-Git-Tag: v2.6.28-rc1~11^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c5121b78ba5c70a9990e2af6cb4d6bbffe0d4d8;p=pandora-kernel.git

[SCSI] export busy state via q->lld_busy_fn()

This patch implements q->lld_busy_fn() for scsi mid layer to export
its busy state for request stacking drivers.

For efficiency, no lock is taken to check the busy state of
shost/starget/sdev, since the returned value is not guaranteed and
may be changed after request stacking drivers call the function,
regardless of taking lock or not.

When scsi can't dispatch I/Os anymore and needs to kill I/Os
(e.g. !sdev), scsi needs to return 'not busy'.
Otherwise, request stacking drivers may hold requests forever.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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