Attachment 146233 Details for Bug 212265 – Fix obvious minor bugs and improve performance

Fix obvious minor bugs and improve performance

iscsi-deactivate-lvs (text/plain), 3.27 KB, created by Dave Wysochanski on 2007-01-22 21:33:04 UTC

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Creator: Dave Wysochanski

Created: 2007-01-22 21:33:04 UTC

Size: 3.27 KB

patch

obsolete

>#!/bin/sh
>#
># Flush iscsi-based Logical Volumes
>#
># FIXME: Does not handle iscsi root
>#
>
>#
># Put this operation here so we only do it 1x.
># The reason is that "iscsi-ls -l" is expensive (calls scsi_id to get inquiry
># data)
>#
>iscsi_dev_sds="`iscsi-ls -l | grep Device | awk '{print $2}'| sed -e 's%/dev/%%'`"
>
>
>#
># Description: Determine whether passed in device is an iscsi or is part of
>#              a dm device that has an iscsi device at a leaf node in the
>#              dm tree
>#
># Parameters:
>#   $1 - device in question, in the following format: "major:minor"
>#
># Return Values:
>#   1 - is an iSCSI device, or is part of dm map that has iscsi devices
>#   0 - not an iSCSI device, and not part of a dm map with iscsi devices
>#
>is_iscsi_map()
>{
>	dev=$1
>	#
>	# First, check to see if this is a dm-device.  If it is, we need
>	# to go through the tree to a leaf node
>	#
>	major=`echo $1 | awk -F ":" '{ print $1 }'`
>	minor=`echo $1 | awk -F ":" '{ print $2 }'`
>	dmcmd=`dmsetup deps -j $major -m $minor >& /dev/null`
>	#
>	# FIXME: Catch potential infinite recursion
>	#
>	# one danger here would be infinite recursion if, for some reason,
>	# the above dmsetup cmd would always return success...
>	# For this reason, we might want to consider a max depth variable
>	# or some other infinite recursion technique
>	#
>	if [ $? -eq 0 ]; then
>		# dm device
>		# echo "DBG: Is a dm device: $1"
>		# dependencies line looks like this:
>		# # dmsetup deps iscsi--vg0-iscsi--stripe--lv0
>		# 3 dependencies  : (253, 2) (253, 3) (253, 4)
>		deps=`dmsetup deps -j $major -m $minor | perl -ne 'if (/^\d+\s*dependencies\s*:\s*(.*)/) { $x = $1; $x =~ tr/[(,)]/[ , ]/; $x =~ s/,\s+/:/g; print $x; }'`
>		for dep in $deps; do
>			# echo "DBG: One dep is: $dep"
>			# need recursion here
>			is_iscsi_map $dep
>			if [ $? -eq 1 ]; then
>				return 1
>			fi
>		done
>		# if we get here, then we know we are not an iscsi device or dm
>		# device with iscsi dependencies
>		return 0
>	fi
>
>	# echo "DBG: Not a dm device: $1"
>	#
>	# Ok, leaf node, so check to see if it's iscsi
>	#
>        for dev_sd in $iscsi_dev_sds; do
>		# check to see if major/minor matches
>		# for list, we can use: "cat /sys/block/$dev_sd/dev"
>		cur_dev=`cat /sys/block/$dev_sd/dev`
>		#echo "DBG: dev_sd: $dev_sd"
>		#echo "DBG: current dev: $cur_dev"
>		#echo "DBG: dev: $dev"
>		if [ $cur_dev == $dev ]; then
>			# echo "DBG: Found iscsi device map: $dev"
>			return 1
>		fi
>	done
>	# no match found - maybe this is a dm device?
>	# use recursion here...
>	#echo "DBG: Not an iscsi device map: $dev"
>	return 0
>}
>
>
>#
># Description: Find the iSCSI-based LVs and deactivate them.  An iSCSI based
>#              LV is one which any iSCSI device is at the bottom of the dm
>#              device tree for that device.
>#
># FIXME: Won't work with snapshots - need to filter these out and only deactivate
># origins
>#
># FIXME: Won't work with more complex mappings (mirror on linear)
># 
>deactivate_iscsi_lvs()
>{
>	lvpaths=`lvs --noheadings -ovg_name,lv_name 2>/dev/null | awk '{ print $1 "/" $2 }'`
>	for onelv in $lvpaths; do
>		onedev=`lvs --noheadings -okernel_major,kernel_minor $onelv 2>/dev/null | awk '{ print $1 ":" $2 }'`
>		is_iscsi_map $onedev
>		if [ $? -eq 1 ]; then
>			echo "$onelv iSCSI based LV, deactivating"
>			lvchange -an $onelv
>		else
>			echo "$onelv not iSCSI based LV, not deactivating"
>		fi
>	done
>}
>
>deactivate_iscsi_lvs

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Attachments on bug 212265: 139412 | 139417 | 139418 | 139480 | 145748 | 145749 | 146233 | 146264 | 146457 | 411163 | 411399