Add support for reading MAM attributes to camcontrol(8) and libcam(3).

MAM is Medium Auxiliary Memory and is most commonly found as flash
chips on tapes.

This includes support for reading attributes and decoding most
known attributes, but does not yet include support for writing
attributes or reporting attributes in XML format.

libsbuf/Makefile:
	Add subr_prf.c for the new sbuf_hexdump() function.  This
	function is essentially the same function.

libsbuf/Symbol.map:
	Add a new shared library minor version, and include the
	sbuf_hexdump() function.

libsbuf/Version.def:
	Add version 1.4 of the libsbuf library.

libutil/hexdump.3:
	Document sbuf_hexdump() alongside hexdump(3), since it is
	essentially the same function.

camcontrol/Makefile:
	Add attrib.c.

camcontrol/attrib.c:
	Implementation of READ ATTRIBUTE support for camcontrol(8).

camcontrol/camcontrol.8:
	Document the new 'camcontrol attrib' subcommand.

camcontrol/camcontrol.c:
	Add the new 'camcontrol attrib' subcommand.

camcontrol/camcontrol.h:
	Add a function prototype for scsiattrib().

share/man/man9/sbuf.9:
	Document the existence of sbuf_hexdump() and point users to
	the hexdump(3) man page for more details.

sys/cam/scsi/scsi_all.c:
	Add a table of known attributes, text descriptions and
	handler functions.

	Add a new scsi_attrib_sbuf() function along with a number
	of other related functions that help decode attributes.

	scsi_attrib_ascii_sbuf() decodes ASCII format attributes.

	scsi_attrib_int_sbuf() decodes binary format attributes, and
	will pass them off to scsi_attrib_hexdump_sbuf() if they're
	bigger than 8 bytes.

	scsi_attrib_vendser_sbuf() decodes the vendor and drive
	serial number attribute.

	scsi_attrib_volcoh_sbuf() decodes the Volume Coherency
	Information attribute that LTFS writes out.

sys/cam/scsi/scsi_all.h:
	Add a number of attribute-related structure definitions and
	other defines.

	Add function prototypes for all of the functions added in
	scsi_all.c.

sys/kern/subr_prf.c:
	Add a new function, sbuf_hexdump().  This is the same as
	the existing hexdump(9) function, except that it puts the
	result in an sbuf.

	This also changes subr_prf.c so that it can be compiled in
	userland for includsion in libsbuf.

	We should work to change this so that the kernel hexdump
	implementation is a wrapper around sbuf_hexdump() with a
	statically allocated sbuf with a drain.  That will require
	a drain function that goes to the kernel printf() buffer
	that can take a non-NUL terminated string as input.
	That is because an sbuf isn't NUL-terminated until it is
	finished, and we don't want to finish it while we're still
	using it.

	We should also work to consolidate the userland hexdump and
	kernel hexdump implemenatations, which are currently
	separate.  This would also mean making applications that
	currently link in libutil link in libsbuf.

sys/sys/sbuf.h:
	Add the prototype for sbuf_hexdump(), and add another copy
	of the hexdump flag values if they aren't already defined.

	Ideally the flags should be defined in one place but the
	implemenation makes it difficult to do properly.  (See
	above.)

Sponsored by:	Spectra Logic Corporation
MFC after:	1 week

3 files changed, 8 insertions, 1 deletions

diff --git a/lib/libsbuf/Makefile b/lib/libsbuf/Makefile
index 79d3fe9..98ceeb6 100644
--- a/lib/libsbuf/Makefile
+++ b/lib/libsbuf/Makefile
@@ -2,7 +2,7 @@
 
 LIB=		sbuf
 SHLIBDIR?= 	/lib
-SRCS=		subr_sbuf.c 
+SRCS=		subr_prf.c subr_sbuf.c
 
 SHLIB_MAJOR	= 6
 
diff --git a/lib/libsbuf/Symbol.map b/lib/libsbuf/Symbol.map
index cf2508f..164b8f3 100644
--- a/lib/libsbuf/Symbol.map
+++ b/lib/libsbuf/Symbol.map
@@ -27,3 +27,7 @@ FBSD_1.3 {
 	sbuf_start_section;
 	sbuf_end_section;
 };
+
+FBSD_1.4 {
+	sbuf_hexdump;
+};
diff --git a/lib/libsbuf/Version.def b/lib/libsbuf/Version.def
index fb0b3f6..fd5c6be 100644
--- a/lib/libsbuf/Version.def
+++ b/lib/libsbuf/Version.def
@@ -5,3 +5,6 @@ FBSD_1.2 {
 
 FBSD_1.3 {
 } FBSD_1.2;
+
+FBSD_1.4 {
+} FBSD_1.3;