Sg ioctls removed in version 3

The Linux SCSI Generic (sg) HOWTO
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# 8.22. Sg ioctls removed in version 3

Some seldom used ioctl()s introduced in the sg 2.x series drivers have been withdrawn. They are:

- SG_SET_UNDERRUN_FLAG (and _GET_) [use 'resid' in this new interface]

- SG_SET_MERGE_FD (and _GET) [added complexity with little benefit]

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