More fixes for 6.3-rc3:

 * Fix the new allocator tracepoints because git am mismerged the
   changes such that the trace_XXX got rebased to be in function YYY
   instead of XXX.
 * Ensure that the perag AGFL_RESET state is consistent with whatever
   we've just read off the disk.
 * Fix a bug where we used the wrong iext cursor during a write begin.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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