[LU-1693] filter_do_bio() and osd_do_bio() should set bi_rw before calling bio_add_page()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.3.0, Lustre 2.4.0, Lustre 2.1.4
• Affects Version/s: Lustre 2.1.0, Lustre 2.2.0, Lustre 2.3.0
• Labels: obdfilter osd-ldiskfs patch
• Severity: 3
• Assignee: WC Triage
• Reporter: John Hammond

Description

filter_do_bio() calls bio_add_page() without setting the direction of the bio. In bio_add_page() the direction is passed on to the merge_bvec_fn() if defined. raid5_mergeable_bvec() does check the direction and setting it correctly improves write bandwidth by allowing for full stripe writes.

I assume that this is equally true of osd_do_bio().