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Why does ZIO_REWRITE_PIPELINE have ZIO_STAGE_WRITE_COMPRESS and ZIO_STAGE_WRITE_BP_INIT stages?
Looking at zio_write_compress and zio_write_bp_init functions which implement the corresponding stages, they seem to just do nothing for non-allocating zio-s. Where IO_IS_ALLOCATING checks for presence of ZIO_STAGE_DVA_ALLOCATE stage which ZIO_REWRITE_PIPELINE doesn't include.
It doesn't look like ZIO_STAGE_DVA_ALLOCATE could be mixed in later.
So what's the point?
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Why does
ZIO_REWRITE_PIPELINEhaveZIO_STAGE_WRITE_COMPRESSandZIO_STAGE_WRITE_BP_INITstages?Looking at
zio_write_compressandzio_write_bp_initfunctions which implement the corresponding stages, they seem to just do nothing for non-allocating zio-s. WhereIO_IS_ALLOCATINGchecks for presence ofZIO_STAGE_DVA_ALLOCATEstage whichZIO_REWRITE_PIPELINEdoesn't include.It doesn't look like
ZIO_STAGE_DVA_ALLOCATEcould be mixed in later.So what's the point?
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