introduce several basic utility function

These utility function will be shared by several files, they are all
operation related to mount stuff.

Meantime define DEFAULT_PATH="/var/crash".

v5-> v6:
    Since in rhel7 nfs4 becomes default nfs version, and its fstype is
nfs4. So change the implementation of get_fs_type_from_target(),
whatever fstype returned from findmount, just echo nfs as fstype for all
nfs version.

v6->v7:
    Introduce is_fs_type_nfs to check if fstype is nfs or nfs4 per Vivek's
idea.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

kdump-lib.sh

@@ -3,6 +3,7 @@
 # Kdump common variables and functions
 #
 
+DEFAULT_PATH="/var/crash/"
 FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
 FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
 
@@ -21,6 +22,13 @@ is_raw_dump_target()
     grep -q "^raw" /etc/kdump.conf
 }
 
+is_fs_type_nfs()
+{
+    local _fstype=$1
+    [ $_fstype = "nfs" ] || [ $_fstype = "nfs4" ] && return 0
+    return 1
+}
+
 strip_comments()
 {
     echo $@ | sed -e 's/\(.*\)#.*/\1/'
@@ -82,6 +90,26 @@ get_root_fs_device()
     return
 }
 
+get_mntpoint_from_path() 
+{
+    echo $(df $1 | tail -1 |  awk '{print $NF}')
+}
+
+get_target_from_path()
+{
+    echo $(df $1 | tail -1 |  awk '{print $1}')
+}
+
+get_fs_type_from_target() 
+{
+    echo $(findmnt -k -f -n -r -o FSTYPE $1)
+}
+
+get_mntpoint_from_target()
+{
+    echo $(findmnt -k -f -n -r -o TARGET $1)
+}
+
 # get_option_value <option_name>
 # retrieves value of option defined in kdump.conf
 get_option_value() {

mkdumprd

@@ -12,7 +12,7 @@ export IN_KDUMP=1
 conf_file="/etc/kdump.conf"
 SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
 SAVE_PATH=$(grep ^path $conf_file| cut -d' '  -f2)
-[ -z "$SAVE_PATH" ] && SAVE_PATH="/var/crash"
+[ -z "$SAVE_PATH" ] && SAVE_PATH=$DEFAULT_PATH
 extra_modules=""
 dracut_args=("--hostonly" "-o" "plymouth dash resume")
 OVERRIDE_RESETTABLE=0