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btrfs: add functions to get and put a device for replace target

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For the replace tests we need a device as a spare device,
here functions _spare_dev_get() and _spare_dev_put()
will get it from the SCRATCH_DEV_POOL_SAVED, which is set
when _scratch_dev_pool_get() is called, and is based on how
many has already been assigned to SCRATCH_DEV_POOL.

 usage:
   _scratch_dev_pool_get 3
   _spare_dev_get

      SPARE_DEV will have a device set which can be
      used as the replace target device.

   _spare_dev_put
   _scratch_dev_pool_put

_spare_dev_get() will pick the next device after SCRATCH_DEV_POOL
devices, from the SCRATCH_DEV_POOL_SAVED, and assigns it to
SPARE_DEV. _spare_dev_put() will set to SPARE_DEV to null.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Anand Jain
2016-06-23 21:28:13 +08:00
committed by Eryu Guan
parent 3dc4411e64
commit 030c355ea0
1 changed files with 59 additions and 0 deletions
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common/rc
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@@ -802,6 +802,65 @@ _scratch_mkfs()
esac
}
# Helper function to get a spare or replace-target device from
# configured SCRATCH_DEV_POLL, must call _scratch_dev_pool_get()
# before _spare_dev_get(). Replace-target-device/Spare-device will
# be assigned to SPARE_DEV.
# As of now only one replace-target-device/spare-device can be
# assigned.
#
# Usage:
# _scratch_dev_pool_get() <ndevs>
# _spare_dev_get()
# :: do stuff
# _spare_dev_put()
# _scratch_dev_pool_put()
#
_spare_dev_get()
{
typeset -p SCRATCH_DEV_POOL_SAVED >/dev/null 2>&1
if [ $? -ne 0 ]; then
_fail "Bug: unset val, must call _scratch_dev_pool_get before _spare_dev_get"
fi
if [ -z "$SCRATCH_DEV_POOL_SAVED" ]; then
_fail "Bug: str empty, must call _scratch_dev_pool_get before _spare_dev_get"
fi
# Check if the spare is already assigned
typeset -p SPARE_DEV >/dev/null 2>&1
if [ $? -eq 0 ]; then
if [ ! -z "$SPARE_DEV" ]; then
_fail "Bug: SPARE_DEV = $SPARE_DEV already assigned"
fi
fi
local ndevs=`echo $SCRATCH_DEV_POOL| wc -w`
local config_ndevs=`echo $SCRATCH_DEV_POOL_SAVED| wc -w`
if [ $ndevs -eq $config_ndevs ]; then
_notrun "All devs used no spare"
fi
# Get a dev that is not used
local devs[]="( $SCRATCH_DEV_POOL_SAVED )"
SPARE_DEV=${devs[@]:$ndevs:1}
export SPARE_DEV
}
_spare_dev_put()
{
typeset -p SPARE_DEV >/dev/null 2>&1
if [ $? -ne 0 ]; then
_fail "Bug: unset val, must call _spare_dev_get before its put"
fi
if [ -z "$SPARE_DEV" ]; then
_fail "Bug: str empty, must call _spare_dev_get before its put"
fi
export SPARE_DEV=""
}
#
# Generally test cases will have..
# _require_scratch_dev_pool X