mkdumprd: omit dracut modules in case of network dumping

In case of only network target, we can clearly and safely
remove more unnecessary modules to reduce initramfs size,
and to enhance stability.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>

mkdumprd

@@ -385,12 +385,13 @@ crypt_exists=0
 omit_dracut_modules()
 {
     local target majmin
-    local dm_exists
+    local dm_exists network_only
 
     # Skip fadump case
     is_fadump_capable && return
 
     dm_exists=0
+    network_only=1
 
     for target in $(get_kdump_targets); do
         if [ -b "$target" ]; then
@@ -398,6 +399,9 @@ omit_dracut_modules()
             # Check "dm"
             check_block_and_slaves is_dm $majmin && dm_exists=1
         fi
+
+        # Check nfs/ssh dumping
+        [[ "$target" != "nfs" && "$target" != "ssh" ]] && network_only=0
     done
 
     # Omit "crypt", BZ1451717
@@ -410,6 +414,12 @@ omit_dracut_modules()
         # "dm_exists=0" implies "crypt_exists=0"
         add_dracut_arg "--omit" "lvm dm multipath dmraid"
     fi
+
+    # Further omit more modules in case of nfs/ssh dumping
+    if [ "$network_only" == "1" ]; then
+        # "network_only=1" implies "dm_exists=0"
+        add_dracut_arg "--omit" "iscsi fcoe fcoe-uefi"
+    fi
 }
 
 if ! check_resettable; then