SG_GET_SG_TABLESIZE
The Linux SCSI Generic (sg) HOWTO
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8.17. SG_GET_SG_TABLESIZE

SG_GET_SG_TABLESIZE 0x227F. Assumes 3rd argument points to an int and places the maximum number of scatter gather elements supported by the host adapter associated with the current SCSI device. 0 indicates that the adapter does support scatter gather.

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