Add linux user disk support

This topic branch contains all the changes needed to integrate the user
side zfs tools with Linux style devices.  Primarily this includes fixing
up the Solaris libefi library to be Linux friendly, and integrating with
the libblkid library which is provided by e2fsprogs.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

module/zfs/sa.c

@@ -1436,6 +1436,7 @@ sa_lookup(sa_handle_t *hdl, sa_attr_type_t attr, void *buf, uint32_t buflen)
 int
 sa_lookup_uio(sa_handle_t *hdl, sa_attr_type_t attr, uio_t *uio)
 {
+#ifdef HAVE_ZPL
 	int error;
 	sa_bulk_attr_t bulk;
 
@@ -1452,7 +1453,9 @@ sa_lookup_uio(sa_handle_t *hdl, sa_attr_type_t attr, uio_t *uio)
 	}
 	mutex_exit(&hdl->sa_lock);
 	return (error);
-
+#else
+	return ENOSYS;
+#endif /* HAVE_ZPL */
 }
 #endif
 

module/zfs/zfs_sa.c

@@ -67,7 +67,7 @@ sa_attr_reg_t zfs_attr_table[ZPL_END+1] = {
 };
 
 #ifdef _KERNEL
-
+#ifdef HAVE_ZPL
 int
 zfs_sa_readlink(znode_t *zp, uio_t *uio)
 {
@@ -331,4 +331,5 @@ zfs_sa_upgrade_txholds(dmu_tx_t *tx, znode_t *zp)
 	}
 }
 
+#endif /* HAVE_ZPL */
 #endif