xfs: add tracepoints and error injection for deferred extent freeing
Add a couple of tracepoints for the deferred extent free operation and a site for injecting errors while finishing the operation. This makes it easier to debug deferred ops and test log redo. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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Dave Chinner

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@@ -596,6 +596,8 @@ xfs_bmap_add_free(
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new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
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new->xefi_startblock = bno;
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new->xefi_blockcount = (xfs_extlen_t)len;
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trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0,
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XFS_FSB_TO_AGBNO(mp, bno), len);
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xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list);
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}
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