Improve camcontrol(8) handling of drive defect data.

This includes a new summary mode (-s) for camcontrol defects that
quickly tells the user the most important thing: how many defects
are in the requested list.  The actual location of the defects is
less important.

Modern drives frequently have more than the 8191 defects that can
be reported by the READ DEFECT DATA (10) command.  If they don't
have that many grown defects, they certainly have more than 8191
defects in the primary (i.e. factory) defect list.

The READ DEFECT DATA (12) command allows for longer parameter
lists, as well as indexing into the list of defects, and so allows
reporting many more defects.

This has been tested with HGST drives and Seagate drives, but
does not fully work with Seagate drives.  Once I have a Seagate
spec I may be able to determine whether it is possible to make it
work with Seagate drives.

scsi_da.h:	Add a definition for the new long block defect
		format.

		Add bit and mask definitions for the new extended
		physical sector and bytes from index defect
		formats.

		Add a prototype for the new scsi_read_defects() CDB
		building function.

scsi_da.c:	Add a new scsi_read_defects() CDB building function.
		camcontrol(8) was previously composing CDBs manually.
		This is long overdue.

camcontrol.c:	Revamp the camcontrol defects subcommand.  We now
		go through multiple stages in trying to get defect
		data off the drive while avoiding various drive
		firmware quirks.

		We start off by requesting the defect header with
		the 10 byte command.  If we're in summary mode (-s)
		and the drive reports fewer defects than can be
		represented in the 10 byte header, we're done.
		Otherwise, we know that we need to issue the
		12 byte command if the drive reports the maximum
		number of defects.

		If we're in summary mode, we're done if we get a
		good response back when asking for the 12 byte header.

		If the user has asked for the full list, then we
		use the address descriptor index field in the 12
		byte CDB to step through the list in 64K chunks.
		64K is small enough to work with most any ancient
		or modern SCSI controller.

		Add support for printing the new long block defect
		format, as well as the extended physical sector and
		bytes from index formats.  I don't have any drives
		that support the new formats.

		Add a hexadecimal output format that can be turned
		on with -X.

		Add a quiet mode (-q) that can be turned on with
		the summary mode (-s) to just print out a number.

		Revamp the error detection and recovery code for
		the defects command to work with HGST drives.

		Call the new scsi_read_defects() CDB building
		function instead of rolling the CDB ourselves.

		Pay attention to the residual from the defect list
		request when printing it out, so we don't run off
		the end of the list.

		Use the new scsi_nv library routines to convert
		from strings to numbers and back.

camcontrol.8:	Document the new defect formats (longblock, extbfi,
		extphys) and command line options (-q, -s, -S and
		-X) for the defects subcommand.

		Explain a little more about what drives generally
		do and don't support.

Sponsored by:	Spectra Logic
MFC after:	1 week

sbin/camcontrol/camcontrol.8

@@ -110,6 +110,10 @@
 .Aq Fl f Ar format
 .Op Fl P
 .Op Fl G
+.Op Fl q
+.Op Fl s
+.Op Fl S Ar offset
+.Op Fl X
 .Nm
 .Ic modepage
 .Op device id
@@ -513,18 +517,16 @@ connecting to that device.
 Note that this can have a destructive impact
 on the system.
 .It Ic defects
-Send the SCSI READ DEFECT DATA (10) command (0x37) to the given device, and
+Send the
+.Tn SCSI
+READ DEFECT DATA (10) command (0x37) or the 
+.Tn SCSI
+READ DEFECT DATA (12) command (0xB7) to the given device, and
 print out any combination of: the total number of defects, the primary
 defect list (PLIST), and the grown defect list (GLIST).
 .Bl -tag -width 11n
 .It Fl f Ar format
-The three format options are:
-.Em block ,
-to print out the list as logical blocks,
-.Em bfi ,
-to print out the list in bytes from index format, and
-.Em phys ,
-to print out the list in physical sector format.
+Specify the requested format of the defect list.
 The format argument is
 required.
 Most drives support the physical sector format.
@@ -541,12 +543,52 @@ If the drive uses a non-standard sense code to report that it does not
 support the requested format,
 .Nm
 will probably see the error as a failure to complete the request.
+.Pp
+The format options are:
+.Bl -tag -width 9n
+.It block
+Print out the list as logical blocks.
+This is limited to 32-bit block sizes, and isn't supported by many modern
+drives.
+.It longblock
+Print out the list as logical blocks.
+This option uses a 64-bit block size.
+.It bfi 
+Print out the list in bytes from index format.
+.It extbfi
+Print out the list in extended bytes from index format.
+The extended format allows for ranges of blocks to be printed.
+.It phys 
+Print out the list in physical sector format.
+Most drives support this format.
+.It extphys
+Print out the list in extended physical sector format.
+The extended format allows for ranges of blocks to be printed.
+.El
+.Pp
 .It Fl G
 Print out the grown defect list.
 This is a list of bad blocks that have
 been remapped since the disk left the factory.
 .It Fl P
 Print out the primary defect list.
+This is the list of defects that were present in the factory.
+.It Fl q
+When printing status information with
+.Fl s ,
+only print the number of defects.
+.It Fl s
+Just print the number of defects, not the list of defects.
+.It Fl S Ar offset
+Specify the starting offset into the defect list.
+This implies using the
+.Tn SCSI
+READ DEFECT DATA (12) command, as the 10 byte version of the command
+doesn't support the address descriptor index field.
+Not all drives support the 12 byte command, and some drives that support
+the 12 byte command don't support the address descriptor index field.
+.It Fl X
+Print out defects in hexadecimal (base 16) form instead of base 10 form.
 .El
 .Pp
 If neither