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btrfs: add functions to set and reset required number of SCRATCH_DEV_POOL

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This patch provides functions
 _scratch_dev_pool_get()
 _scratch_dev_pool_put()

Which will help to set/reset SCRATCH_DEV_POOL with the required
number of devices. SCRATCH_DEV_POOL_SAVED will hold all the devices.

Usage:
  _scratch_dev_pool_get() <ndevs>
  :: do stuff

  _scratch_dev_pool_put()

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 21:25:39 +08:00
committed by Eryu Guan
parent 9490edd677
commit 3dc4411e64
1 changed files with 55 additions and 0 deletions
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common/rc
+55
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@@ -802,6 +802,61 @@ _scratch_mkfs()
esac
}
#
# Generally test cases will have..
# _require_scratch_dev_pool X
# to make sure it has the enough scratch devices including
# replace-target and spare device. Now arg1 here is the
# required number of scratch devices by a-test-case excluding
# the replace-target and spare device. So this function will
# set SCRATCH_DEV_POOL to the specified number of devices.
#
# Usage:
# _scratch_dev_pool_get() <ndevs>
# :: do stuff
#
# _scratch_dev_pool_put()
#
_scratch_dev_pool_get()
{
if [ $# -ne 1 ]; then
_fail "Usage: _scratch_dev_pool_get ndevs"
fi
local test_ndevs=$1
local config_ndevs=`echo $SCRATCH_DEV_POOL| wc -w`
local devs[]="( $SCRATCH_DEV_POOL )"
typeset -p config_ndevs >/dev/null 2>&1
if [ $? -ne 0 ]; then
_fail "Bug: cant find SCRATCH_DEV_POOL ndevs"
fi
if [ $config_ndevs -lt $test_ndevs ]; then
_notrun "Need at least test requested number of ndevs $test_ndevs"
fi
SCRATCH_DEV_POOL_SAVED=${SCRATCH_DEV_POOL}
export SCRATCH_DEV_POOL_SAVED
SCRATCH_DEV_POOL=${devs[@]:0:$test_ndevs}
export SCRATCH_DEV_POOL
}
_scratch_dev_pool_put()
{
typeset -p SCRATCH_DEV_POOL_SAVED >/dev/null 2>&1
if [ $? -ne 0 ]; then
_fail "Bug: unset val, must call _scratch_dev_pool_get before _scratch_dev_pool_put"
fi
if [ -z "$SCRATCH_DEV_POOL_SAVED" ]; then
_fail "Bug: str empty, must call _scratch_dev_pool_get before _scratch_dev_pool_put"
fi
export SCRATCH_DEV_POOL=$SCRATCH_DEV_POOL_SAVED
export SCRATCH_DEV_POOL_SAVED=""
}
_scratch_pool_mkfs()
{
case $FSTYP in