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Brian Atkinson
345196be18
In order to reduce contention on the vq_lock, optional skip sectors for Raidz writes can be placed into a single IO request. This is done by padding out the linear ABD for a parity column to contain the skip sector and by creating gang ABD to contain the data and skip sector for data columns. The vdev_raidz_map_alloc() function now contains specific functions for both reads and write to allocate the ABD's that will be issued down to the VDEV chldren. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-By: Mark Maybee <mark.maybee@delphix.com> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes #12333