bde7a88707
rescan-scsi-bus: sgdevice26: do not traverse sg class if scsi_device isnot added, which would speed up the rescan flow. rescan-scsi-bus.sh: add option --no-lip-scan, which would make FC can rescan device with specific channel and target Signed-off-by: Wenchao Hao <haowenchao@huawei.com>
58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
From 4ea97e60c544ad44ee7396c815064d87f0d25874 Mon Sep 17 00:00:00 2001
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From: Douglas Gilbert <dgilbert@interlog.com>
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Date: Sun, 7 Aug 2022 02:49:03 +0000
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Subject: [PATCH] rescan-scsi-bus: sgdevice26: do not traverse sg class if
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scsi_device isnot added
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For system which has a massive number of scsi_devices, it would takes a long time to
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traverse /sys/class/scsi_generic to find a related sg. If the scsi_device of specific
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scsiid host:channel:target:lun did not added, the traverse would find no sg neither.
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Signed-off-by: Wenchao Hao <haowenchao@huawei.com>
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From: https://github.com/doug-gilbert/sg3_utils/pull/21
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git-svn-id: https://svn.bingwo.ca/repos/sg3_utils/trunk@965 6180dd3e-e324-4e3e-922d-17de1ae2f315
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---
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scripts/rescan-scsi-bus.sh | 19 +++++++++++--------
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1 file changed, 11 insertions(+), 8 deletions(-)
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diff --git a/scripts/rescan-scsi-bus.sh b/scripts/rescan-scsi-bus.sh
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index 0c33384..f3e3b2c 100755
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--- a/scripts/rescan-scsi-bus.sh
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+++ b/scripts/rescan-scsi-bus.sh
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@@ -184,18 +184,21 @@ sgdevice26 ()
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{
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local gendev
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+ # if the scsi device has not been added, then there would not
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+ # a related sgdev. So it's pointless to scan all sgs to find
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+ # a related sg.
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+ scsidev=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}
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+ if [ ! -e "$scsidev" ]; then
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+ SGDEV=""
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+ return
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+ fi
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+
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gendev=/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/generic
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if [ -e "$gendev" ] ; then
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SGDEV=$(basename "$(readlink "$gendev")")
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- else
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- for SGDEV in /sys/class/scsi_generic/sg*; do
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- DEV=$(readlink "$SGDEV/device")
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- if [ "${DEV##*/}" = "$host:$channel:$id:$lun" ] ; then
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- SGDEV=$(basename "$SGDEV"); return
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- fi
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- done
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- SGDEV=""
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+ return
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fi
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+ SGDEV=""
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}
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# Find sg device with 2.4 report-devs extensions
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--
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2.27.0
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