tree 0c4112f87ca3d6b7669aa0d4b3913cd97f84a8ce
parent de0e8c20ba3a65b0f15040aabbefdc1999876e6b
author Dave Chinner <dchinner@redhat.com> 1424688294 +1100
committer Dave Chinner <david@fromorbit.com> 1424688294 +1100

xfs: use i_mmaplock on write faults

Take the i_mmaplock over write page faults. These come through the
->page_mkwrite callout, so we need to wrap that calls with the
i_mmaplock.

This gives us a lock order of mmap_sem -> i_mmaplock -> page_lock
-> i_lock.

Also, move the page_mkwrite wrapper to the same region of xfs_file.c
as the read fault wrappers and add a tracepoint.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>