Eliminate duplicated code and struct member definitions in the handoff

of args data between gptboot/zfsboot and loader(8).

Despite what seems like a lot of changes here, there are no actual
changes in behavior, or in the data layout in the structures involved.
This is just eliminating identical code pasted into multiple locations.

In detail, the changes are...

- Move struct zfs_boot_args definition from libsa/zfs/libzfs.h to
  i386/common/bootargs.h because it is specific to x86 booting and the
  handoff between zfsboot and loader, and has no relation to the zfs
  library code in general.

- The geli_boot_args and zfs_boot_args structs both contain an identical
  set of member variables containing geli information.  Extract this out
  to a new geli_boot_data struct, and embed it in the arg-passing structs.

- Provide new routines geli_import_boot_data() and geli_export_boot_data()
  that can be shared between gptboot, zfsboot, and loader instead of
  pasting identical code into several different .c files.

- Remove some checks for a NULL pointer that can never be true because the
  pointer being tested was set using pointer math (kargs + 1) and that can
  never result in NULL in this code.

1 files changed, 1 insertions, 7 deletions

diff --git a/stand/i386/gptboot/gptboot.c b/stand/i386/gptboot/gptboot.c
index 04212be0786d..9c52de7cb941 100644
--- a/stand/i386/gptboot/gptboot.c
+++ b/stand/i386/gptboot/gptboot.c
@@ -114,7 +114,6 @@ static int vdev_read(void *vdev __unused, void *priv, off_t off, void *buf,
 #ifdef LOADER_GELI_SUPPORT
 #include "geliboot.h"
 static char gelipw[GELI_PW_MAXLEN];
-static struct keybuf *gelibuf;
 #endif
 
 struct gptdsk {
@@ -480,12 +479,7 @@ load(void)
 #ifdef LOADER_GELI_SUPPORT
 	geliargs.size = sizeof(geliargs);
 	explicit_bzero(gelipw, sizeof(gelipw));
-	gelibuf = malloc(sizeof(struct keybuf) +
-	    (GELI_MAX_KEYS * sizeof(struct keybuf_ent)));
-	geli_export_key_buffer(gelibuf);
-	geliargs.notapw = '\0';
-	geliargs.keybuf_sentinel = KEYBUF_SENTINEL;
-	geliargs.keybuf = gelibuf;
+	export_geli_boot_data(&geliargs.gelidata);
 #endif
 	/*
 	 * Note that the geliargs struct is passed by value, not by pointer.