1*8ce070c1SUlrich Spörlein$FreeBSD$ 26527fda5SDoug RabsonThese tests are intended to make sure that NFS's use of the 36527fda5SDoug Rabsonb_{valid,dirty}{off,end} fields of struct buf is consistent with the 46527fda5SDoug RabsonVM system's use of the underlying VM pages. 56527fda5SDoug Rabson 66527fda5SDoug RabsonTest1: 76527fda5SDoug Rabson Open the file and write into the file, creating a buf 86527fda5SDoug Rabson with a valid range and a dirty range 96527fda5SDoug Rabson 106527fda5SDoug Rabson Fsync, flushing the dirty range 116527fda5SDoug Rabson 126527fda5SDoug Rabson Mmap and read the whole page. Since only part of the page is 136527fda5SDoug Rabson valid, the VM system must re-read the invalid parts of the 146527fda5SDoug Rabson page. 156527fda5SDoug Rabson 166527fda5SDoug RabsonTest2: 176527fda5SDoug Rabson This is the same as test1 without the fsync. The VM system 186527fda5SDoug Rabson should first write out the dirty range and then read the rest 196527fda5SDoug Rabson of the page. This is currently broken since the vnode_pager 206527fda5SDoug Rabson doesn't use the original buf for its i/o and therefore the 21*8ce070c1SUlrich Spörlein information in b_dirtyoff, b_dirtyend is not available. 22