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[SCSI] scsi_debug: prepare to enable clustering
Currently, clustering support for scsi_debug is disabled. This is because there are for_each_sg() loops which assume that each sg list element is consisted with a single page. But enabling clustering support, each sg list element for scsi commands can be consisted with multiple pages. This replaces these for_each_sg() loops with sg mapping iterator which is capable of handling each sg list element is consisted with multiple pages. Signed-off-by: Akinobu Mita <[email protected]> Reviewed-by: Douglas Gilbert <[email protected]> Reviewed-by: Martin K. Petersen <[email protected]> Signed-off-by: James Bottomley <[email protected]>
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