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|
#!/bin/bash
cmd=
glpath=
vgname=
lvname=
offset=
suffix=
sanlvmd=
host_id=0
lock_mode=
no_active=
active_mode=
# sanlvmd is only needed when lv activation locks are used.
# It is not needed for the vglk, which protects vg metadata
# by serializing commands changing the vg.
#
# sanlvmd is a process that sanlock views as owning the lv
# activation leases. When a vg disappears/fails, sanlock
# will notify the owner of the leases in that vg; in this
# case, it sends SIGTERM to sanlvmd. When sanlvmd gets
# this SIGTERM, it knows that its leases will be disappearing
# soon, and that another host would be able to acquire them.
# So, it needs to force the local host to stop using the
# lv's it has locked, since they won't be locked much longer.
#
# To do this, it could:
# - forcibly deactivate the sanlvm lvs in the failed vgs
# - suspend the lv's in the failed vgs
# - or suspend lv's, replace with the error target and resume
# and once done, it can release the leases on those lvs.
#
# (If the sanlock watchdog is enabled, it will fire to reset
# the host if sanlvmd is not able to release the leases
# before another host could acquire them.)
#
# If the lv's are suspended, sanlvmd could monitor and wait
# for the vg to reappear. When it does, it could reacquire
# the leases for the suspended lv's and then resume the lv's.
# (Unless the leases have been acquired by another host since
# they were released, in which case they cannot be reacquired
# by the oringal host, and the lv's will not be resumed.)
help() {
vg="\$vg"
host_id="\$host_id"
echo ""
echo "/etc/sanlvm.conf"
echo " must contain unique host_id definition from 1 to 2000, e.g."
echo " host_id 1"
echo ""
echo "sanlvm vgcreate [options] $vg <devs>"
echo " create vg, create and initialize storage in $vg for sanlock to use"
echo ""
echo "sanlvm start"
echo " start lockspaces for sanlvm vgs, created above"
echo ""
echo "sanlvm <lvmcmd> ..."
echo " lvm commands within $vg are serialized by sanlock"
echo ""
echo "sanlvm [--na] lvcreate ..."
echo " create an lv with or without (--na) an associated lv"
echo " activation lease. without an activation lease, the"
echo " the activation state among hosts is ignored."
echo ""
echo "sanlvm --sh|ex lvchange -ay ..."
echo " acquire a shared or exclusive lease, then activate the lv."
echo " an exclusive lease prevents more than one host from activating"
echo " the lv at once, a shared lease allows multiple hosts to"
echo " activate the lv at once, and prevents any from activating"
echo " it exclusively."
echo ""
echo "sanlvm lvchange -an ..."
echo " deactivate the lv, then release its lease"
echo ""
exit 0
}
# vg name is the arg preceding the first pv path arg,
# or the last arg when no pv paths exist
# e.g. vgcreate, vgchange, vgextend, lvcreate
get_vg_name() {
prev=$2
for i in $get_args
do
first=`expr substr $i 1 1`
if [[ "$first" == "/" ]]; then
vgname=$prev
return
fi
prev=$i
done
for i in $get_args
do
vgname=$i
done
}
# lv name follows -n or --name arg
# FIXME: this doesn't work without a space, i.e. -nfoo
get_lv_name() {
save_next=0
for i in $get_args
do
if [[ $save_next == 1 ]]; then
lvname=$i
return
fi
if [[ "$i" == "-n" ]] || [[ "$i" == "--name" ]]; then
save_next=1
continue
fi
done
}
# vg name is part of an lv path, e.g. lvextend, lvremove
# first arg containing '/'
get_vg_lv_name() {
for i in $get_args
do
ind=`expr index $i /`
if [ $ind -gt 0 ]; then
lvname=`basename $i`
dir=`dirname $i`
vgname=`basename $dir`
return
fi
done
}
get_host_id() {
host_id=`awk '/^host_id/ { print $2 }' < /etc/sanlvm.conf`
if [[ $? -ne 0 ]]; then
echo "no host_id found in /etc/sanlvm.conf"
exit 1
fi
}
get_gl_path() {
glpath=`awk '/^global_lease_path/ { print $2 }' < /etc/sanlvm.conf`
if [[ $? -ne 0 ]]; then
echo "no global_lease_path found in /etc/sanlvm.conf"
fi
}
# search lvchange/vgchange args for -a, ---available
# if there's a "y" anywhere after the option, then active_mode="y"
# if there's a "n" anywhere after the option, then active_mode="n"
get_active_mode() {
for i in $get_args
do
if [[ "$i" == "-ay" ]] || [[ "$i" == "-aly" ]] || [[ "$i" == "-aey" ]]; then
active_mode="y"
return
fi
if [[ "$i" == "-an" ]] || [[ "$i" == "-aln" ]] || [[ "$i" == "-aen" ]]; then
active_mode="n"
return
fi
if [[ "$i" == "-a" ]] || [[ "$i" == "--available" ]]; then
check_next=1
continue
fi
if [[ $check_next == 1 ]]; then
ind=`expr index $i y`
if [ "$ind" -gt 0 ]; then
active_mode="y"
else
active_mode="n"
fi
return
fi
done
}
# get the offset value from the @sanlvm_offset_xyz tag on the lv
get_lease_offset() {
tags=`lvs --noheadings -o lv_name,lv_tags $vgname | grep $lvname | grep sanlvm_offset_ | awk '{print $2}'`
if [[ "$tags" == "" ]]; then
return
fi
# FIXME: handle case where the lv has tags in addition to ours
offset=`echo $tags | cut --delimiter=_ --fields=3`
}
check_vg_start() {
sanlock client status | grep 's $vgname'
if [[ $? -eq 0 ]]; then
# FIXME: just start the lockspace here?
echo "lockspace for $vgname must be started"
exit 1
fi
}
vgcreate() {
lvm $get_args
if [[ $? -ne 0 ]]; then
exit 1
fi
lvm lvcreate -n leases -L 1G $vgname
if [[ $? -ne 0 ]]; then
exit 1
fi
sanlock direct init -s $vgname:0:/dev/$vgname/leases:0
if [[ $? -ne 0 ]]; then
exit 1
fi
sanlock direct init -r $vgname:vglk:/dev/$vgname/leases:1048576
if [[ $? -ne 0 ]]; then
exit 1
fi
lvm vgchange --addtag @sanlvm $vgname
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
}
lvchange() {
if [[ "$active_mode" == "y" ]]; then
sanlock client acquire -r $vgname:$lvname:/dev/$vgname/leases:$offset$suffix -p $sanlvmd
if [[ $? -ne 0 ]]; then
echo "lv lock failed for $vgname/$lvname, may be active on another host"
return
fi
lvm lvchange -ay $vgname/$lvname
else
lvm lvchange -an $vgname/$lvname
if [[ $? -ne 0 ]]; then
echo "deactivate failed for $vgname/$lvname, may be open"
return
fi
sanlock client release -r $vgname:$lvname:/dev/$vgname/leases:$offset -p $sanlvmd
fi
}
if [[ $# == 0 ]]; then
help
fi
arg1=$1
if [[ "$arg1" == "help" ]]; then
help
fi
if [[ "$arg1" == "--ex" ]] || [[ "$arg1" == "--sh" ]]; then
lock_mode=$arg1
cmd=$2
elif [[ "$arg1" == "--na" ]]; then
no_active=$arg1
cmd=$2
else
cmd=$1
fi
if [[ "$cmd" == "vgcreate" ]] || [[ "$cmd" == "vgremove" ]] || [[ "$cmd" == "vgextend" ]]; then
get_gl_path
if [[ "$glpath" == "" ]]; then
echo "Warning: no global_lease_path found in /etc/sanlvm.conf"
echo "Concurrent vgcreate, vgremove, and vgextend commands"
echo "will not be properly synchronized among hosts."
echo "(Concurrent vgextend of the same vg will be proteted,"
echo "and operations within a vg will be protected.)"
fi
fi
if [[ "$cmd" == "global_init" ]] || [[ "$cmd" == "global_init_force" ]]; then
get_gl_path
if [[ "$glpath" == "" ]]; then
echo "no global_lease_path found in /etc/sanlvm.conf"
exit 1
fi
sanlock client status | grep 's sanlvm_global'
if [[ $? -eq 0 ]]; then
echo "$glpath already initialized and in use."
exit 1
fi
sanlock direct read_id -s sanlvm_global:1:$glpath:0
if [[ $? -eq 0 ]] && [[ "$cmd" == "global_init" ]]; then
echo "$glpath already initialized and may be in use."
echo "use sanlvm global_init_force to override."
exit 1
fi
sanlock direct init -s sanlvm_global:0:$glpath:0
if [[ $? -ne 0 ]]; then
exit 1
fi
sanlock direct init -r sanlvm_global:lease:$glpath:1048576
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "_start" ]]; then
# wrapped by shared sanlvm_global:lease
vgname=$SANLVM_VGNAME
host_id=$SANLVM_HOST_ID
# Parallel starts among hosts with SH lease are ok.
# We don't want to start the vg/lockspace while another
# host is removing it with vgremove.
#
# vgcreate/vgremove/vgextend use the exclusive mode.
# We want to serialize this start with vgremove; vgremove
# holds the ex global lease and checks that the lockspace/vg
# is not added/in-use on any other hosts.
lvm lvchange -a y /dev/$vgname/leases
if [[ $? -ne 0 ]]; then
echo "failed to activate /dev/$vgname/leases"
exit 1
fi
echo "adding lockspace $vgname, this may take minutes..."
sanlock add_lockspace -s $vgname:$host_id:/dev/$vgname/leases:0
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "start" ]]; then
get_gl_path
get_host_id
if [[ "$glpath" != "" ]]; then
sanlock client status | grep 's sanlvm_global'
if [[ $? -eq 1 ]]; then
echo "starting lockspace sanlvm_global, this may take minutes..."
lvm lvchange -a y $glpath
sanlock add_lockspace -s sanlvm_global:$host_id:$glpath:0
fi
fi
for vgname in `vgs @sanlvm --noheadings -o vg_name`; do
sanlock client status | grep 's $vgname'
if [[ $? -eq 0 ]]; then
continue
fi
# FIXME: do something to prevent sanlvm lv's from
# automatically being activated by the system at
# startup; then this vgchange -an is not needed.
vgchange -an $vgname
if [[ "$glpath" == "" ]]; then
echo "no global lock"
lvm lvchange -a y /dev/$vgname/leases
echo "starting lockspace $vgname, this may take minutes..."
sanlock add_lockspace -s $vgname:$host_id:/dev/$vgname/leases:0
else
export SANLVM_VGNAME=$vgname
export SANLVM_HOST_ID=$host_id
sanlock command -r sanlvm_global:lease:$glpath:1048576:SH -c ./sanlvm _start "$@"
fi
done
exit 0
elif [[ "$cmd" == "stop" ]]; then
get_gl_path
get_host_id
# rem_lockspace will fail if any locks exist in it, i.e.
# if vglk is being used, or any lv's are activated with a lock
for vgname in `vgs @sanlvm --noheadings -o vg_name`; do
sanlock rem_lockspace -s $vgname:$host_id:/dev/$vgname/leases:0
if [[ $? -eq 0 ]]; then
lvm lvchange -an $vgname/leases
else
echo "cannot stop lockspace $vgname"
fi
done
sanlock rem_lockspace -s sanlvm_global:$host_id:$glpath:0
exit 0
elif [[ "$cmd" == "_vgcreate" ]]; then
# wrapped by sanlvm_global:lease
shift
get_args=$*
vgname=$SANLVM_VGNAME
vgcreate
elif [[ "$cmd" == "vgcreate" ]]; then
get_args=$*
get_vg_name
if [[ "$glpath" == "" ]]; then
echo "no global lock"
vgcreate
else
export SANLVM_VGNAME=$vgname
sanlock command -r sanlvm_global:lease:$glpath:1048576 -c ./sanlvm _vgcreate "$@"
fi
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "_vgremove" ]]; then
# wrapped by sanlvm_global:lease
shift
vgname=$SANLVM_VGNAME
get_host_id
others=`sanlock client host_status -s $vgname | egrep -v -e ^$host_id -e 'timestamp 0'`
# NB this check can be inaccurate for a short time.
# after another host stops, it takes until our next
# renewal for us to notice and show timestamp 0.
if [[ $? -eq 0 ]]; then
echo "cannot remove vg, other hosts using vg $vgname require sanlvm stop:"
echo "$others"
exit 1
fi
sanlock rem_lockspace -s $vgname:$host_id:/dev/$vgname/leases:0
lvm lvchange -an $vgname/leases
lvm lvremove $vgname/leases
# vgremove
lvm "$@"
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "vgremove" ]]; then
get_args=$*
get_vg_name
check_vg_start
if [[ "$glpath" == "" ]]; then
echo "no global lock"
lvm "$@"
else
export SANLVM_VGNAME=$vgname
sanlock command -r sanlvm_global:lease:$glpath:1048576 -c ./sanlvm _vgremove "$@"
fi
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "vgextend" ]]; then
get_args=$*
get_vg_name
check_vg_start
if [[ "$glpath" == "" ]]; then
echo "no global lock"
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm "$@"
else
sanlock command -r sanlvm_global:lease:$glpath:1048576 -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm "$@"
fi
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "_lvcreate" ]]; then
# wrapped by vglk
shift
get_args=$*
get_vg_name
get_lv_name
offset=`sanlock direct next_free /dev/$vgname/leases`
if [[ $? -ne 0 ]]; then
echo "no space for new lease on /dev/$vgname/leases"
exit 1
fi
# FIXME: if we use recent lvcreate arg to disable activation,
# on creation, then we can remove the lvchange -an that follows.
# lvcreate
lvm "$@"
if [[ $? -ne 0 ]]; then
exit 1
fi
lvm lvchange -an $vgname/$lvname
if [[ $? -ne 0 ]]; then
exit 1
fi
lvm lvchange --addtag @sanlvm_offset_$offset $vgname/$lvname
if [[ $? -ne 0 ]]; then
exit 1
fi
sanlock direct init -r $vgname:$lvname:/dev/$vgname/leases:$offset
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "lvcreate" ]]; then
get_args=$*
get_vg_name
check_vg_start
if [[ "$no_active" == "--na" ]]; then
echo "creating lv without activation lock"
shift
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm "$@"
else
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c ./sanlvm _lvcreate "$@"
fi
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "_lvremove" ]]; then
# wrapped by vglk
shift
vgname=$SANLVM_VGNAME
lvname=$SANLVM_LVNAME
offset=$SANLVM_OFFSET
sanlvmd=`pidof sanlvmd`
if [[ $? -ne 0 ]]; then
echo "sanlvmd not found, required for lv locks"
exit 1
fi
# refuse to remove the lv if the local host has the lv activated
status=`sanlock client status | grep "r $vgname:$lvname"`
if [[ "$status" != "" ]]; then
echo "lv must be be deactivated before remove"
exit 1
fi
# acquire ex activation lock on the lv so we know that no hosts have it active
sanlock client acquire -r $vgname:$lvname:/dev/$vgname/leases:$offset -p $sanlvmd
if [[ $? -ne 0 ]]; then
echo "lv lock failed, may be active on another host"
exit 1
fi
# lvremove
lvm "$@"
sanlock client release -r $vgname:$lvname:/dev/$vgname/leases:$offset -p $sanlvmd
# clear the lease area that was used for the lv activation lease at offset
dd if=/dev/zero of=/dev/$vgname/leases seek=`expr $offset / 512` bs=512 count=2048
exit 0
elif [[ "$cmd" == "lvremove" ]]; then
get_args=$*
get_vg_lv_name
get_lease_offset
check_vg_start
if [[ "$offset" == "" ]]; then
echo "no lv activation lock for $vgname/$lvname, only protecting vg"
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm "$@"
else
export SANLVM_VGNAME=$vgname
export SANLVM_LVNAME=$lvname
export SANLVM_OFFSET=$offset
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c ./sanlvm _lvremove "$@"
fi
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "_lvextend" ]] || [[ "$cmd" == "_lvreduce" ]] || [[ "$cmd" == "_lvconvert" ]] || [[ "$cmd" == "_lvresize" ]]; then
# wrapped by vglk
shift
vgname=$SANLVM_VGNAME
lvname=$SANLVM_LVNAME
offset=$SANLVM_OFFSET
sanlvmd=`pidof sanlvmd`
if [[ $? -ne 0 ]]; then
echo "sanlvmd not found, required for lv locks"
exit 1
fi
# refuse to extend/reduce/convert the lv if the local host has the lv activate
# FIXME: allow extend of active lv, not reduce
status=`sanlock client status | grep "r $vgname:$lvname"`
if [[ "$status" != "" ]]; then
echo "lv must be be deactivated before extend/reduce/convert/resize"
exit 1
fi
# acquire ex activation lock on the lv so we know that no hosts have it active
sanlock client acquire -r $vgname:$lvname:/dev/$vgname/leases:$offset -p $sanlvmd
if [[ $? -ne 0 ]]; then
echo "lv lock failed, may be active on another host"
exit 1
fi
# lvextend/lvreduce/lvconvert/lvresize
lvm "$@"
sanlock client release -r $vgname:$lvname:/dev/$vgname/leases:$offset -p $sanlvmd
exit 0
elif [[ "$cmd" == "lvextend" ]] || [[ "$cmd" == "lvreduce" ]] || [[ "$cmd" == "lvconvert" ]] || [[ "$cmd" == "lvresize" ]]; then
get_args=$*
get_vg_lv_name
get_lease_offset
check_vg_start
if [[ "$offset" == "" ]]; then
echo "no lv activation lock for $vgname/$lvname, only protecting vg"
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm "$@"
else
export SANLVM_VGNAME=$vgname
export SANLVM_LVNAME=$lvname
export SANLVM_OFFSET=$offset
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm _$cmd "$@"
fi
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "lvchange" ]]; then
get_args=$*
get_vg_lv_name
get_active_mode
get_lease_offset
check_vg_start
if [[ "$active_mode" != "y" ]] && [[ "$active_mode" != "n" ]]; then
# non-activation related change to vg
# are there other vg changes that would require vglk?
echo "no locks needed for this command, use lvchange directly"
exit 1
fi
if [[ "$active_mode" == "y" ]] && [[ "$lock_mode" == "" ]]; then
echo "lock mode required, use sanlvm --ex|sh for vg/lv activation"
exit 1
fi
if [[ "$active_mode" == "y" ]] && [[ "$lock_mode" != "--sh" ]] && [[ "$lock_mode" != "--ex" ]]; then
echo "invalid lock mode, use sanlvm --ex|sh for vg/lv activation"
exit 1
fi
if [[ "$active_mode" == "n" ]] && [[ "$lock_mode" != "" ]]; then
echo "no lock mode required for vg/lv deactivation"
exit 1
fi
if [[ "$lock_mode" == "--sh" ]]; then
suffix=":SH"
fi
sanlvmd=`pidof sanlvmd`
if [[ $? -ne 0 ]]; then
echo "sanlvmd not found, required for lv locks"
exit 1
fi
if [[ "$offset" == "" ]]; then
echo "no lv activation lock for $vgname/$lvname, use lvchange directly"
exit 1
fi
lvchange
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
elif [[ "$cmd" == "vgchange" ]]; then
get_args=$*
get_vg_name
get_active_mode
check_vg_start
if [[ "$active_mode" != "y" ]] && [[ "$active_mode" != "n" ]]; then
# non-activation related change to vg
# are there other vg changes that would require vglk?
echo "no locks needed for this command, use vgchange directly"
exit 1
fi
if [[ "$active_mode" == "y" ]] && [[ "$lock_mode" == "" ]]; then
echo "lock mode required, use sanlvm --ex|sh for vg/lv activation"
exit 1
fi
if [[ "$active_mode" == "y" ]] && [[ "$lock_mode" != "--sh" ]] && [[ "$lock_mode" != "--ex" ]]; then
echo "invalid lock mode, use sanlvm --ex|sh for vg/lv activation"
exit 1
fi
if [[ "$active_mode" == "n" ]] && [[ "$lock_mode" != "" ]]; then
echo "no lock mode required for vg/lv deactivation"
exit 1
fi
if [[ "$lock_mode" == "--sh" ]]; then
suffix=":SH"
fi
sanlvmd=`pidof sanlvmd`
if [[ $? -ne 0 ]]; then
echo "sanlvmd not found, required for lv locks"
exit 1
fi
for lvname in `lvs $vgname --noheadings -o lv_name`; do
if [[ "$lvname" == "leases" ]]; then
continue
fi
get_lease_offset
if [[ "$offset" == "" ]]; then
echo "no lv activation lock for $vgname/$lvname, use lvchange directly"
continue
fi
lvchange
done
exit 0
elif [[ "$cmd" == "vgmerge" ]] || [[ "$cmd" == "vgsplit" ]] || [[ "$cmd" == "vgrename" ]] || [[ "$cmd" == "lvrename" ]]; then
# FIXME: the vg commands could be implemented by combining
# a global lease and vglk's
echo "command not supported with sanlvm"
exit 1
else
if [[ $# -lt 2 ]]; then
echo vg name required
exit 1
fi
get_args=$*
get_vg_name
sanlock command -r $vgname:vglk:/dev/$vgname/leases:1048576 -c /sbin/lvm "$@"
if [[ $? -ne 0 ]]; then
exit 1
fi
exit 0
fi
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