Comment 214 for bug 1470250

I have a test kernel with commit cd4842f4(1c8349a17 in mainline) reverted. It can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1470250/reverts/commit-cd4842f4-reverted/

Like I mentioned in the last comment, there is a later xfs commit which depended on commit 1c8349a17 for set_page_writeback_keepwrite(). That xfs commit is:
0d085a5 xfs: ensure WB_SYNC_ALL writeback handles partial pages correctly

I also reverted that xfs commit in this test kernel. I'm going to test this kernel to see if it exhibits the bug and if commit 1c8349a17 is the culprit.