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virtiofs support for kexec-tools

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This patch add virtiofs support for kexec-tools by introducing a new option
for /etc/kdump.conf:

virtiofs myfs

Where myfs is a variable tag name specified in qemu cmdline
"-device vhost-user-fs-pci,tag=myfs".

The patch covers the following cases:
1) Dumping VM's vmcore to a virtiofs shared directory;
2) When the VM's rootfs is a virtiofs shared directory and dumping the
   VM's vmcore to its subdirectory, such as /var/crash;
3) The combination of case 1 & 2: The VM's rootfs is a virtiofs shared
   directory and dumping the VM's vmcore to another virtiofs shared
   directory.

Case 2 & 3 need dracut >= 057, otherwise VM cannot boot from virtiofs
shared rootfs. But it is not the issue of kexec-tools.

Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Tao Liu <ltao@redhat.com>
This commit is contained in:
Tao Liu 2022-09-23 18:13:11 +08:00 committed by Coiby Xu
parent d905d49c08
commit c743881ae6
7 changed files with 46 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
dracut-kdump.sh
View File

@ -519,7 +519,7 @@ read_kdump_confs()
DUMP_INSTRUCTION="dump_fs $config_val"
fi
;;
ext[234] | xfs | btrfs | minix | nfs)
ext[234] | xfs | btrfs | minix | nfs | virtiofs)
config_val=$(get_mntpoint_from_target "$config_val")
DUMP_INSTRUCTION="dump_fs $config_val"
;;

2
dracut-module-setup.sh
View File

@ -673,7 +673,7 @@ kdump_install_conf() {
_pdev=$(persistent_policy="by-id" kdump_get_persistent_dev "$_val")
sed -i -e "s#^${_opt}[[:space:]]\+$_val#$_opt $_pdev#" "${initdir}/tmp/$$-kdump.conf"
;;
ext[234] | xfs | btrfs | minix)
ext[234] | xfs | btrfs | minix | virtiofs)
_pdev=$(kdump_get_persistent_dev "$_val")
sed -i -e "s#^${_opt}[[:space:]]\+$_val#$_opt $_pdev#" "${initdir}/tmp/$$-kdump.conf"
;;

24
kdump-lib-initramfs.sh
View File

@ -55,6 +55,11 @@ is_fs_type_nfs()
[ "$1" = "nfs" ] || [ "$1" = "nfs4" ]
}
is_fs_type_virtiofs()
{
[ "$1" = "virtiofs" ]
}
# If $1 contains dracut_args "--mount", return <filesystem type>
get_dracut_args_fstype()
{
@ -110,6 +115,23 @@ is_raw_dump_target()
[ -n "$(kdump_get_conf_val raw)" ]
}
is_virtiofs_dump_target()
{
if [ -n "$(kdump_get_conf_val virtiofs)" ]; then
return 0
fi
if is_fs_type_virtiofs "$(get_dracut_args_fstype "$(kdump_get_conf_val dracut_args)")"; then
return 0
fi
if is_fs_type_virtiofs "$(get_fs_type_from_target "$(get_target_from_path "$(get_save_path)")")"; then
return 0
fi
return 1
}
is_nfs_dump_target()
{
if [ -n "$(kdump_get_conf_val nfs)" ]; then
@ -129,5 +151,5 @@ is_nfs_dump_target()
is_fs_dump_target()
{
[ -n "$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix")" ]
[ -n "$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|virtiofs")" ]
}

33
kdump-lib.sh
View File

@ -81,35 +81,31 @@ to_dev_name()
is_user_configured_dump_target()
{
[[ $(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw\|nfs\|ssh") ]] || is_mount_in_dracut_args
}
get_user_configured_dump_disk()
{
local _target
_target=$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw")
[[ -n $_target ]] && echo "$_target" && return
_target=$(get_dracut_args_target "$(kdump_get_conf_val "dracut_args")")
[[ -b $_target ]] && echo "$_target"
[[ $(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw\|nfs\|ssh\|virtiofs") ]] || is_mount_in_dracut_args
}
get_block_dump_target()
{
local _target _path
local _target _fstype
if is_ssh_dump_target || is_nfs_dump_target; then
return
fi
_target=$(get_user_configured_dump_disk)
_target=$(kdump_get_conf_val "ext[234]\|xfs\|btrfs\|minix\|raw\|virtiofs")
[[ -n $_target ]] && to_dev_name "$_target" && return
# Get block device name from local save path
_path=$(get_save_path)
_target=$(get_target_from_path "$_path")
[[ -b $_target ]] && to_dev_name "$_target"
_target=$(get_dracut_args_target "$(kdump_get_conf_val "dracut_args")")
[[ -b $_target ]] && to_dev_name "$_target" && return
_fstype=$(get_dracut_args_fstype "$(kdump_get_conf_val "dracut_args")")
is_fs_type_virtiofs "$_fstype" && echo "$_target" && return
_target=$(get_target_from_path "$(get_save_path)")
[[ -b $_target ]] && to_dev_name "$_target" && return
_fstype=$(get_fs_type_from_target "$_target")
is_fs_type_virtiofs "$_fstype" && echo "$_target" && return
}
is_dump_to_rootfs()
@ -125,6 +121,7 @@ get_failure_action_target()
# Get rootfs device name
_target=$(get_root_fs_device)
[[ -b $_target ]] && to_dev_name "$_target" && return
is_fs_type_virtiofs "$(get_fs_type_from_target "$_target")" && echo "$_target" && return
# Then, must be nfs root
echo "nfs"
fi

2
kdump.conf
View File

@ -43,6 +43,7 @@
# It's recommended to use persistent device names
# such as /dev/vg/<devname>.
# Otherwise it's suggested to use label or uuid.
# Supported fs types: ext[234], xfs, btrfs, minix, virtiofs
#
# path <path>
# - "path" represents the file system path in which vmcore
@ -171,6 +172,7 @@
#ext4 /dev/vg/lv_kdump
#ext4 LABEL=/boot
#ext4 UUID=03138356-5e61-4ab3-b58e-27507ac41937
#virtiofs myfs
#nfs my.server.com:/export/tmp
#nfs [2001:db8::1:2:3:4]:/export/tmp
#ssh user@my.server.com

6
kdumpctl
View File

@ -239,7 +239,7 @@ parse_config()
_set_config _fstype "$config_opt" || return 1
config_opt=_target
;;
ext[234] | minix | btrfs | xfs | nfs | ssh)
ext[234] | minix | btrfs | xfs | nfs | ssh | virtiofs)
_set_config _fstype "$config_opt" || return 1
config_opt=_target
;;
@ -478,8 +478,8 @@ check_fs_modified()
fi
# No need to check in case of raw target.
# Currently we do not check also if ssh/nfs target is specified
if is_ssh_dump_target || is_nfs_dump_target || is_raw_dump_target; then
# Currently we do not check also if ssh/nfs/virtiofs target is specified
if is_ssh_dump_target || is_nfs_dump_target || is_raw_dump_target || is_virtiofs_dump_target; then
return 0
fi

2
mkdumprd
View File

@ -391,7 +391,7 @@ while read -r config_opt config_val; do
extra_modules)
extra_modules="$extra_modules $config_val"
;;
ext[234] | xfs | btrfs | minix | nfs)
ext[234] | xfs | btrfs | minix | nfs | virtiofs)
check_user_configured_target "$config_val" "$config_opt"
add_mount "$config_val" "$config_opt"
;;