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These tests are intended to make sure that NFS's use of the b_{valid,dirty}{off,end} fields of struct buf is consistent with the VM system's use of the underlying VM pages. Test1: Open the file and write into the file, creating a buf with a valid range and a dirty range Fsync, flushing the dirty range Mmap and read the whole page. Since only part of the page is valid, the VM system must re-read the invalid parts of the page. Test2: This is the same as test1 without the fsync. The VM system should first write out the dirty range and then read the rest of the page. This is currently broken since the vnode_pager doesn't use the original buf for its i/o and therefore the information in b_dirtyoff, b_dirtyend is not avalable.