ceph_pagelist_reserve
err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
err = ceph_pagelist_reserve(pagelist, total_len);
err = ceph_pagelist_reserve(pagelist,
err = ceph_pagelist_reserve(pagelist, need);
err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
err = ceph_pagelist_reserve(pagelist,
extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
EXPORT_SYMBOL(ceph_pagelist_reserve);