[LU-6479] sub object held by master object will stop it to be released

• Type: Bug
• Resolution: Not a Bug
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.7.0
• Severity: 3
• Assignee: Di Wang
• Reporter: Di Wang

Description

Sub stripe object will be holded by master object until the master object is freed. (lod_object_free()->lod_object_free_striping()

void lod_object_free_striping(const struct lu_env *env, struct lod_object *lo)
{
        int i; 
         
        if (lo->ldo_dir_stripe != NULL) {
                OBD_FREE_PTR(lo->ldo_dir_stripe);
                lo->ldo_dir_stripe = NULL;
        }
        
        if (lo->ldo_stripe) {
                LASSERT(lo->ldo_stripes_allocated > 0);

                for (i = 0; i < lo->ldo_stripenr; i++) {
                        if (lo->ldo_stripe[i])
                                lu_object_put(env, &lo->ldo_stripe[i]->do_lu);
                }

                i = sizeof(struct dt_object *) * lo->ldo_stripes_allocated;
                OBD_FREE(lo->ldo_stripe, i);
                lo->ldo_stripe = NULL;
                lo->ldo_stripes_allocated = 0;
        }
        ............

So the master object (of striped directory) should be freed immediately once the ref count reach to 0.