184 lines
2.7 KiB
HTML
184 lines
2.7 KiB
HTML
<HTML
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>cmd_len</TITLE
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TITLE="The Linux SCSI Generic (sg) HOWTO"
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TITLE="The sg_io_hdr_t structure in detail"
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>The Linux SCSI Generic (sg) HOWTO</TH
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>Chapter 6. The sg_io_hdr_t structure in detail</TD
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><A
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NAME="AEN184">6.3. cmd_len</H1
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><P
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> This is the length in bytes of the SCSI command that 'cmdp' points
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to. As a SCSI command is expected an EMSGSIZE error number is
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produced if the value is less than 6 or greater than 16. Further,
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if the SCSI mid level has a further limit then EMSGSIZE is produced
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in this case as well.
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<A
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NAME="AEN187"
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HREF="#FTN.AEN187"
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>[1]</A
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>
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The type of cmd_len is unsigned char.</P
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></DIV
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><H3
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>Notes</H3
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>[1]</A
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ALIGN="LEFT"
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VALIGN="TOP"
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WIDTH="95%"
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><P
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>Linux kernel prior to 2.4.15 limited SCSI commands to a length of 12
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bytes. In lk 2.4.15 this was raised to 16 bytes. However unless lower
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level drivers (e.g. aic7xxx) indicate that they can handle 16 byte
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commands (and few currently do) then the command is aborted with a
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DID_ABORT host status.</P
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