[LU-6995] incorrect use of bvec_iter_page in dio_complete_routine

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Frank Zago (Inactive)

Description

bvec_iter_page is expecting a biovecs list as a first argument, not a biovec. That works as long as there is only one biovec in the bio. If there is more than one, then invalid memory is dereferences since bvl is a single vector, not a list. This only affect 3.14+ kernels, where HAVE_BVEC_ITER is true. Don't use bvec_iter_page, but create the right macro to simply return the vector's bv_page. Bug introduced in commit 833b670a.