[LU-12055] lod: ignore root layout if parent's one includes pool

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0
• Severity: 3
• Assignee: Vladimir Saveliev
• Reporter: Vladimir Saveliev

Description

When parent directory provides striping information which includes a pool, missing layout components should not be taken from root directory striping (in lod_ah_init()). Otherwise, pool configuration and root layout mismatch leads to create failure.
Test to illustrate the issue:

test_27H() {
	local POOL=${POOL:-testpool}
        local ostrange="1 1 1"
 
        $SETSTRIPE -c 2 -i 0 $MOUNT
        pool_add $POOL || error "pool_add failed"
        pool_add_targets $POOL $ostrange || "pool_add_targets failed"
        test_mkdir $DIR/$tdir
	$SETSTRIPE -p $POOL $DIR/$tdir
        $MULTIOP $DIR/$tdir/$tfile Oc || error "multiop failed"
        $GETSTRIPE $DIR/$tdir/$tfile
}
run_test 27H "check that root dir striping does not break parent dir one"

The test's output:

== sanity test 27H: check that root dir striping does not break parent dir one ======================= 09:28:20 (1552199300)
Creating new pool
Pool lustre.testpool created
Adding targets to pool
OST lustre-OST0001_UUID added to pool lustre.testpool
open(O_RDWR|O_CREAT): Invalid argument
 sanity test_27H: @@@@@@ FAIL: multiop failed