Xen project Mailing List

On Mon, Aug 15, 2016 at 6:50 PM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:

Blktap2 is effectively dead code for a few years.

Notable changes in this patch:

0. Unhook blktap2 from build system
1. Now libxl no longer supports TAP ask backend, appropriate assertions

s/ask/disk/

are added and some code paths now return ERROR_FAIL
2. Tap is no longer a supported backend in doc
3. Remove relevant entries in MAINTAINERS

A patch to actually remove blktap2 directory will come later.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Compile-test only at this stage.

Ross, do you have any objection for this? I haven't seen update from the
joint blktap2 maintenance for a few months.

Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Shriram Rajagopalan <rshriram@xxxxxxxxx>
Cc: Yang Hongyang <imhy.yang@xxxxxxxxx>
Cc: Ross Philipson <ross.philipson@xxxxxxxxx>
Cc: Lars Kurth <lars.kurth@xxxxxxxxxx>
---
.gitignore | 14 ------
INSTALL | 4 --
MAINTAINERS | 2 -
config/Tools.mk.in | 1 -
docs/misc/xl-disk-configuration.txt | 2 +-
tools/Makefile | 1 -
tools/Rules.mk | 17 +------
tools/config.h.in | 6 ---
tools/configure | 83 --------------------------------
tools/configure.ac | 22 ---------
tools/libxl/Makefile | 8 +---
tools/libxl/check-xl-disk-parse | 2 +-
tools/libxl/libxl.c | 25 ++--------
tools/libxl/libxl_blktap2.c | 94 -------------------------------------
tools/libxl/libxl_device.c | 32 ++-----------
tools/libxl/libxl_dm.c | 17 ++-----
tools/libxl/libxl_internal.h | 19 --------
tools/libxl/libxl_noblktap2.c | 42 -----------------
tools/xenstore/hashtable.c | 5 --
tools/xenstore/hashtable.h | 5 --
tools/xenstore/hashtable_private.h | 5 --
21 files changed, 13 insertions(+), 393 deletions(-)
delete mode 100644 tools/libxl/libxl_blktap2.c
delete mode 100644 tools/libxl/libxl_noblktap2.c

diff --git a/.gitignore b/.gitignore
index d193820..ea27777 100644
--- a/.gitignore
+++ b/.gitignore
@@ -97,19 +97,6 @@ tools/libs/evtchn/headers.chk
tools/libs/gnttab/headers.chk
tools/libs/call/headers.chk
tools/libs/foreignmemory/headers.chk
-tools/blktap2/daemon/blktapctrl
-tools/blktap2/drivers/img2qcow
-tools/blktap2/drivers/lock-util
-tools/blktap2/drivers/qcow-create
-tools/blktap2/drivers/qcow2raw
-tools/blktap2/drivers/tapdisk
-tools/blktap2/drivers/tapdisk-client
-tools/blktap2/drivers/tapdisk-diff
-tools/blktap2/drivers/tapdisk-stream
-tools/blktap2/drivers/tapdisk2
-tools/blktap2/drivers/td-util
-tools/blktap2/vhd/vhd-update
-tools/blktap2/vhd/vhd-util
tools/console/xenconsole
tools/console/xenconsoled
tools/console/client/_paths.h
@@ -327,7 +314,6 @@ tools/libxl/*.pyc
tools/libxl/libxl-save-helper
tools/libxl/test_timedereg
tools/libxl/test_fdderegrace
-tools/blktap2/control/tap-ctl
tools/firmware/etherboot/eb-roms.h
tools/firmware/etherboot/gpxe-git-snapshot.tar.gz
tools/misc/xenwatchdogd
diff --git a/INSTALL b/INSTALL
index 9759354..3b255c7 100644
--- a/INSTALL
+++ b/INSTALL
@@ -144,10 +144,6 @@ this detection and the sysv runlevel scripts have to be used.
--with-systemd=DIR
--with-systemd-modules-load=DIR

-The old backend drivers are disabled because qdisk is now the default.
-This option can be used to build them anyway.
- --enable-blktap2
-
Build various stubom components, some are only example code. Its usually
enough to specify just --enable-stubdom and leave these options alone.
--enable-ioemu-stubdom
diff --git a/MAINTAINERS b/MAINTAINERS
index 97720a8..d54795b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -322,8 +322,6 @@ M: Shriram Rajagopalan <rshriram@xxxxxxxxx>
M: Yang Hongyang <imhy.yang@xxxxxxxxx>
S: Maintained
F: docs/README.remus
-F: tools/blktap2/drivers/block-remus.c
-F: tools/blktap2/drivers/hashtable*
F: tools/libxl/libxl_remus_*
F: tools/libxl/libxl_netbuffer.c
F: tools/libxl/libxl_nonetbuffer.c
diff --git a/config/Tools.mk.in b/config/Tools.mk.in
index 0f79f4e..511406c 100644
--- a/config/Tools.mk.in
+++ b/config/Tools.mk.in
@@ -56,7 +56,6 @@ CONFIG_ROMBIOS := @rombios@
CONFIG_SEABIOS := @seabios@
CONFIG_QEMU_TRAD := @qemu_traditional@
CONFIG_QEMU_XEN := @qemu_xen@
-CONFIG_BLKTAP2 := @blktap2@
CONFIG_QEMUU_EXTRA_ARGS:= @EXTRA_QEMUU_CONFIGURE_ARGS@
CONFIG_LIBNL := @libnl@

diff --git a/docs/misc/xl-disk-configuration.txt b/docs/misc/xl-disk-configuration.txt
index b3402bc..2e9345c 100644
--- a/docs/misc/xl-disk-configuration.txt
+++ b/docs/misc/xl-disk-configuration.txt
@@ -155,7 +155,7 @@ backendtype=<backend-type>
--------------------------

Description: Specifies the backend implementation to use
-Supported values: phy, tap, qdisk
+Supported values: phy, qdisk
Mandatory: No
Default value: Automatically determine which backend to use.

diff --git a/tools/Makefile b/tools/Makefile
index 71515b4..b8fe2ce 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -17,7 +17,6 @@ SUBDIRS-y += console
SUBDIRS-y += xenmon
SUBDIRS-y += xenstat
SUBDIRS-$(CONFIG_Linux) += memshr
-SUBDIRS-$(CONFIG_BLKTAP2) += blktap2
SUBDIRS-$(CONFIG_NetBSD) += xenbackendd
SUBDIRS-y += libfsimage
SUBDIRS-$(CONFIG_Linux) += libvchan
diff --git a/tools/Rules.mk b/tools/Rules.mk
index 5a80fec..bbeef14 100644
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -19,7 +19,6 @@ XEN_LIBXC = $(XEN_ROOT)/tools/libxc
XEN_XENLIGHT = $(XEN_ROOT)/tools/libxl
XEN_XENSTORE = $(XEN_ROOT)/tools/xenstore
XEN_LIBXENSTAT = $(XEN_ROOT)/tools/xenstat/libxenstat/src
-XEN_BLKTAP2 = $(XEN_ROOT)/tools/blktap2
XEN_LIBVCHAN = $(XEN_ROOT)/tools/libvchan

CFLAGS_xeninclude = -I$(XEN_INCLUDE)
@@ -143,22 +142,8 @@ CFLAGS += -O0 -g3
PY_CFLAGS += $(PY_NOOPT_CFLAGS)
endif

-LIBXL_BLKTAP ?= $(CONFIG_BLKTAP2)
-
-ifeq ($(LIBXL_BLKTAP),y)
-CFLAGS_libblktapctl = -I$(XEN_BLKTAP2)/control -I$(XEN_BLKTAP2)/include $(CFLAGS_xeninclude)
-SHDEPS_libblktapctl =
-LDLIBS_libblktapctl = $(SHDEPS_libblktapctl) $(XEN_BLKTAP2)/control/libblktapctl$(libextension)
-SHLIB_libblktapctl = $(SHDEPS_libblktapctl) -Wl,-rpath-link=$(XEN_BLKTAP2)/control
-else
-CFLAGS_libblktapctl =
-SHDEPS_libblktapctl =
-LDLIBS_libblktapctl =
-SHLIB_libblktapctl =
-endif
-
CFLAGS_libxenlight = -I$(XEN_XENLIGHT) $(CFLAGS_libxenctrl) $(CFLAGS_xeninclude)
-SHDEPS_libxenlight = $(SHLIB_libxenctrl) $(SHLIB_libxenstore) $(SHLIB_libblktapctl)
+SHDEPS_libxenlight = $(SHLIB_libxenctrl) $(SHLIB_libxenstore)
LDLIBS_libxenlight = $(SHDEPS_libxenlight) $(XEN_XENLIGHT)/libxenlight$(libextension)
SHLIB_libxenlight = $(SHDEPS_libxenlight) -Wl,-rpath-link=$(XEN_XENLIGHT)

diff --git a/tools/config.h.in b/tools/config.h.in
index 478a2cc..1b2df2e 100644
--- a/tools/config.h.in
+++ b/tools/config.h.in
@@ -3,9 +3,6 @@
/* Enabling support partial device tree in libxl */
#undef ENABLE_PARTIAL_DEVICE_TREE

-/* Blktap2 enabled */
-#undef HAVE_BLKTAP2
-
/* Define to 1 if you have the declaration of `fdt_first_subnode', and to 0 if
you don't. */
#undef HAVE_DECL_FDT_FIRST_SUBNODE
@@ -27,9 +24,6 @@
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H

-/* Define to 1 if you have the `aio' library (-laio). */
-#undef HAVE_LIBAIO
-
/* Define to 1 if you have the `crypto' library (-lcrypto). */
#undef HAVE_LIBCRYPTO

diff --git a/tools/configure b/tools/configure
index 51f16c5..53b9a33 100755
--- a/tools/configure
+++ b/tools/configure
@@ -705,7 +705,6 @@ BCC
LD86
AS86
qemu_traditional
-blktap2
LINUX_BACKEND_MODULES
seabios
ovmf
@@ -804,7 +803,6 @@ enable_xsmpolicy
enable_ovmf
enable_seabios
with_linux_backend_modules
-enable_blktap2
enable_qemu_traditional
enable_rombios
with_system_qemu
@@ -1477,8 +1475,6 @@ Optional Features:
--disable-xsmpolicy Disable XSM policy compilation (default is ENABLED)
--enable-ovmf Enable OVMF (default is DISABLED)
--disable-seabios Disable SeaBIOS (default is ENABLED)
- --enable-blktap2 Enable blktap2, (DEFAULT is on for Linux, otherwise
- off)
--enable-qemu-traditional
Enable qemu traditional device model, (DEFAULT is on
for Linux or NetBSD x86, otherwise off)
@@ -4161,7 +4157,6 @@ xen-scsibk
usbbk
pciback
xen-acpi-processor
-blktap2
"
;;
*)
@@ -4173,33 +4168,6 @@ fi
LINUX_BACKEND_MODULES="`eval echo $LINUX_BACKEND_MODULES`"

-# Check whether --enable-blktap2 was given.
-if test "${enable_blktap2+set}" = set; then :
- enableval=$enable_blktap2;
-else
-
- case "$host_os" in
- linux*)
- enable_blktap2="yes";;
- *) enable_blktap2="no";;
- esac
-
-fi
-
-if test "x$enable_blktap2" = "xyes"; then :
-
-
-$as_echo "#define HAVE_BLKTAP2 1" >>confdefs.h
-
- blktap2=y
-else
-
- blktap2=n
-
-fi
-
-
-
# Check whether --enable-qemu-traditional was given.
if test "${enable_qemu_traditional+set}" = set; then :
enableval=$enable_qemu_traditional;
@@ -8290,57 +8258,6 @@ fi

-if test "x$enable_blktap2" = "xyes"; then :
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for io_setup in -laio" >&5
-$as_echo_n "checking for io_setup in -laio... " >&6; }
-if ${ac_cv_lib_aio_io_setup+:} false; then :
- $as_echo_n "(cached) " >&6
-else
- ac_check_lib_save_LIBS=$LIBS
-LIBS="-laio $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
-
-/* Override any GCC internal prototype to avoid an error.
- Use char because int might match the return type of a GCC
- builtin and then its argument prototype would still apply. */
-#ifdef __cplusplus
-extern "C"
-#endif
-char io_setup ();
-int
-main ()
-{
-return io_setup ();
- ;
- return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
- ac_cv_lib_aio_io_setup=yes
-else
- ac_cv_lib_aio_io_setup=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
- conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_aio_io_setup" >&5
-$as_echo "$ac_cv_lib_aio_io_setup" >&6; }
-if test "x$ac_cv_lib_aio_io_setup" = xyes; then :
- cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBAIO 1
-_ACEOF
-
- LIBS="-laio $LIBS"
-
-else
- as_fn_error $? "Could not find libaio" "$LINENO" 5
-fi
-
-
-fi

{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for MD5 in -lcrypto" >&5
$as_echo_n "checking for MD5 in -lcrypto... " >&6; }
diff --git a/tools/configure.ac b/tools/configure.ac
index 3a4abb5..1cfbcaf 100644
--- a/tools/configure.ac
+++ b/tools/configure.ac
@@ -108,7 +108,6 @@ xen-scsibk
usbbk
pciback
xen-acpi-processor
-blktap2
"
;;
*)
@@ -118,24 +117,6 @@ esac])
LINUX_BACKEND_MODULES="`eval echo $LINUX_BACKEND_MODULES`"
AC_SUBST(LINUX_BACKEND_MODULES)

-dnl Enable blktap2 on Linux only.
-AC_ARG_ENABLE([blktap2],
- AS_HELP_STRING([--enable-blktap2],
- [Enable blktap2, (DEFAULT is on for Linux, otherwise off)]),,[
- case "$host_os" in
- linux*)
- enable_blktap2="yes";;
- *) enable_blktap2="no";;
- esac
-])
-AS_IF([test "x$enable_blktap2" = "xyes"], [
-AC_DEFINE([HAVE_BLKTAP2], [1], [Blktap2 enabled])
- blktap2=y],[
- blktap2=n
-])
-AC_SUBST(blktap2)
-
-
AC_ARG_ENABLE([qemu-traditional],
AS_HELP_STRING([--enable-qemu-traditional],
[Enable qemu traditional device model, (DEFAULT is on for Linux or NetBSD x86, otherwise off)]),,[
@@ -357,9 +338,6 @@ AC_CHECK_HEADER([lzo/lzo1x.h], [
AC_CHECK_LIB([lzo2], [lzo1x_decompress], [zlib="$zlib -DHAVE_LZO1X -llzo2"])
])
AC_SUBST(zlib)
-AS_IF([test "x$enable_blktap2" = "xyes"], [
-AC_CHECK_LIB([aio], [io_setup], [], [AC_MSG_ERROR([Could not find libaio])])
-])
AC_SUBST(system_aio)
AC_CHECK_LIB([crypto], [MD5], [], [AC_MSG_ERROR([Could not find libcrypto])])
AX_CHECK_EXTFS
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 14a1a8e..6994c58 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -20,7 +20,7 @@ LIBUUID_LIBS += -luuid
endif

LIBXL_LIBS =
-LIBXL_LIBS = $(LDLIBS_libxentoollog) $(LDLIBS_libxenevtchn) $(LDLIBS_libxenctrl) $(LDLIBS_libxenguest) $(LDLIBS_libxenstore) $(LDLIBS_libblktapctl) $(PTYFUNCS_LIBS) $(LIBUUID_LIBS)
+LIBXL_LIBS = $(LDLIBS_libxentoollog) $(LDLIBS_libxenevtchn) $(LDLIBS_libxenctrl) $(LDLIBS_libxenguest) $(LDLIBS_libxenstore) $(PTYFUNCS_LIBS) $(LIBUUID_LIBS)
ifeq ($(CONFIG_LIBNL),y)
LIBXL_LIBS += $(LIBNL3_LIBS)
endif
@@ -30,7 +30,6 @@ CFLAGS_LIBXL += $(CFLAGS_libxenevtchn)
CFLAGS_LIBXL += $(CFLAGS_libxenctrl)
CFLAGS_LIBXL += $(CFLAGS_libxenguest)
CFLAGS_LIBXL += $(CFLAGS_libxenstore)
-CFLAGS_LIBXL += $(CFLAGS_libblktapctl)
ifeq ($(CONFIG_LIBNL),y)
CFLAGS_LIBXL += $(LIBNL3_CFLAGS)
endif
@@ -46,11 +45,6 @@ LIBXL_LIBS += $(LIBXL_LIBS-y)
LIBXLU_LIBS = $(LDLIBS_libxenlight)

LIBXL_OBJS-y = osdeps.o libxl_paths.o libxl_bootloader.o flexarray.o
-ifeq ($(LIBXL_BLKTAP),y)
-LIBXL_OBJS-y += libxl_blktap2.o
-else
-LIBXL_OBJS-y += libxl_noblktap2.o
-endif

ifeq ($(CONFIG_LIBNL),y)
LIBXL_OBJS-y += libxl_netbuffer.o
diff --git a/tools/libxl/check-xl-disk-parse b/tools/libxl/check-xl-disk-parse
index 03572e4..643f4f4 100755
--- a/tools/libxl/check-xl-disk-parse
+++ b/tools/libxl/check-xl-disk-parse
@@ -3,7 +3,7 @@
set -e

if [ -x ./xl ] ; then
- export LD_LIBRARY_PATH=.:../libxc:../xenstore:../blktap2/control
+ export LD_LIBRARY_PATH=.:../libxc:../xenstore
XL=./xl
else
XL=xl
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 6a50e49..577ed35 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -2218,7 +2218,6 @@ static void device_disk_add(libxl__egc *egc, uint32_t domid,
case LIBXL_DISK_BACKEND_PHY:
dev = disk->pdev_path;

- do_backend_phy:
flexarray_append(back, "params");
flexarray_append(back, dev);

@@ -2230,27 +2229,9 @@ static void device_disk_add(libxl__egc *egc, uint32_t domid,
break;

case LIBXL_DISK_BACKEND_TAP:
- if (dev == NULL) {
- dev = libxl__blktap_devpath(gc, disk->pdev_path,
- disk->format);
- if (!dev) {
- LOG(ERROR, "failed to get blktap devpath for %p",
- disk->pdev_path);
- rc = ERROR_FAIL;
- goto out;
- }
- }
- flexarray_append(back, "tapdisk-params");
- flexarray_append(back, GCSPRINTF("%s:%s",
- libxl__device_disk_string_of_format(disk->format),
- disk->pdev_path));
-
- /* tap backends with scripts are rejected by
- * libxl__device_disk_set_backend */
- assert(!disk->script);
-
- /* now create a phy device to export the device to the guest */
- goto do_backend_phy;
+ LOG(ERROR, "blktap is not supported");
+ rc = ERROR_FAIL;
+ goto out;
case LIBXL_DISK_BACKEND_QDISK:
flexarray_append(back, "params");
flexarray_append(back, GCSPRINTF("%s:%s",
diff --git a/tools/libxl/libxl_blktap2.c b/tools/libxl/libxl_blktap2.c
deleted file mode 100644
index 5c9a0a2..0000000
--- a/tools/libxl/libxl_blktap2.c
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Copyright (C) 2010 Advanced Micro Devices
- * Author Christoph Egger <Christoph.Egger@xxxxxxx>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; version 2.1 only.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- */
-
-#include "libxl_osdeps.h" /* must come before any other headers */
-#include "libxl_internal.h"
-
-#include "tap-ctl.h"
-
-int libxl__blktap_enabled(libxl__gc *gc)
-{
- const char *msg;
- return !tap_ctl_check(&msg);
-}
-
-char *libxl__blktap_devpath(libxl__gc *gc,
- const char *disk,
- libxl_disk_format format)
-{
- const char *type;
- char *params, *devname = NULL;
- tap_list_t tap;
- int err;
-
- type = libxl__device_disk_string_of_format(format);
- err = tap_ctl_find(type, disk, &tap);
- if (err == 0) {
- devname = GCSPRINTF("/dev/xen/blktap-2/tapdev%d", tap.minor);
- if (devname)
- return devname;
- }
-
- params = GCSPRINTF("%s:%s", type, disk);
- err = tap_ctl_create(params, &devname);
- if (!err) {
- libxl__ptr_add(gc, devname);
- return devname;
- }
-
- free(devname);
- return NULL;
-}
-
-
-int libxl__device_destroy_tapdisk(libxl__gc *gc, const char *params)
-{
- char *type, *disk;
- int err;
- tap_list_t tap;
-
- type = libxl__strdup(gc, params);
-
- disk = strchr(type, ':');
- if (!disk) {
- LOG(ERROR, "Unable to parse params %s", params);
- return ERROR_INVAL;
- }
-
- *disk++ = '\0';
-
- err = tap_ctl_find(type, disk, &tap);
- if (err < 0) {
- /* returns -errno */
- LOGEV(ERROR, -err, "Unable to find type %s disk %s", type, disk);
- return ERROR_FAIL;
- }
-
- err = tap_ctl_destroy(tap.id, tap.minor);
- if (err < 0) {
- LOGEV(ERROR, -err, "Failed to destroy tap device id %d minor %d",
- tap.id, tap.minor);
- return ERROR_FAIL;
- }
-
- return 0;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index dbf157d..9c77b62 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -271,26 +271,9 @@ static int disk_try_backend(disk_try_backend_args *a,
return 0;

case LIBXL_DISK_BACKEND_TAP:
- if (a->disk->script) goto bad_script;
-
- if (libxl_defbool_val(a->disk->colo_enable))
- goto bad_colo;
-
- if (a->disk->is_cdrom) {
- LOG(DEBUG, "Disk vdev=%s, backend tap unsuitable for cdroms",
- a->disk->vdev);
- return 0;
- }
- if (!libxl__blktap_enabled(a->gc)) {
- LOG(DEBUG, "Disk vdev=%s, backend tap unsuitable because blktap "
- "not available", a->disk->vdev);
- return 0;
- }
- if (!(a->disk->format == LIBXL_DISK_FORMAT_RAW ||
- a->disk->format == LIBXL_DISK_FORMAT_VHD)) {
- goto bad_format;
- }
- return backend;
+ LOG(DEBUG, "Disk vdev=%s, backend tap unsuitable because blktap "
+ "not supported", a->disk->vdev);
+ return 0;

case LIBXL_DISK_BACKEND_QDISK:
if (a->disk->script) goto bad_script;
@@ -682,8 +665,6 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device *dev)
const char *be_path = libxl__device_backend_path(gc, dev);
const char *fe_path = libxl__device_frontend_path(gc, dev);
const char *libxl_path = libxl__device_libxl_path(gc, dev);
- const char *tapdisk_path = GCSPRINTF("%s/%s", be_path, "tapdisk-params");
- const char *tapdisk_params;
xs_transaction_t t = 0;
int rc;
uint32_t domid;
@@ -695,10 +676,6 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device *dev)
rc = libxl__xs_transaction_start(gc, &t);
if (rc) goto out;

- /* May not exist if this is not a tap device */
- rc = libxl__xs_read_checked(gc, t, tapdisk_path, &tapdisk_params);
- if (rc) goto out;
-
if (domid == LIBXL_TOOLSTACK_DOMID) {
/*
* The toolstack domain is in charge of removing the
@@ -720,9 +697,6 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device *dev)
if (rc < 0) goto out;
}

- if (tapdisk_params)
- rc = libxl__device_destroy_tapdisk(gc, tapdisk_params);
-
out:
libxl__xs_transaction_abort(gc, &t);
return rc;
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index e3bf28f..1da956e 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1362,20 +1362,9 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
continue;
}

- /*
- * We can't call libxl__blktap_devpath from
- * libxl__device_disk_find_local_path for now because
- * the bootloader is called before the disks are set
- * up, so this function would set up a blktap node,
- * but there's no TAP tear-down on error conditions in
- * the bootloader path.
- */
- if (disks[i].backend == LIBXL_DISK_BACKEND_TAP)
- target_path = libxl__blktap_devpath(gc, disks[i].pdev_path,
- disks[i].format);
- else
- target_path = libxl__device_disk_find_local_path(gc,
- guest_domid, &disks[i], true);
+ assert(disks[i].backend != LIBXL_DISK_BACKEND_TAP);
+ target_path = libxl__device_disk_find_local_path(gc,
+ guest_domid, &disks[i], true);

if (!target_path) {
LOG(WARN, "No way to get local access disk to image: %s\n"
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 1222ffa..51d505f 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1705,25 +1705,6 @@ struct libxl__cpuid_policy {
char *policy[4];
};

-/*
- * blktap2 support
- */
-
-/* libxl__blktap_enabled:
- * return true if blktap/blktap2 support is available.
- */
-_hidden int libxl__blktap_enabled(libxl__gc *gc);
-
-/* libxl__blktap_devpath:
- * Argument: path and disk image as specified in config file.
- * The type specifies whether this is aio, qcow, qcow2, etc.
- * returns device path xenstore wants to have. returns NULL
- * if no device corresponds to the disk.
- */
-_hidden char *libxl__blktap_devpath(libxl__gc *gc,
- const char *disk,
- libxl_disk_format format);
-
/* libxl__device_destroy_tapdisk:
* Destroys any tapdisk process associated with the backend represented
* by be_path.
diff --git a/tools/libxl/libxl_noblktap2.c b/tools/libxl/libxl_noblktap2.c
deleted file mode 100644
index 5a86ed1..0000000
--- a/tools/libxl/libxl_noblktap2.c
+++ /dev/null
@@ -1,42 +0,0 @@
-/*
- * Copyright (C) 2010 Advanced Micro Devices
- * Author Christoph Egger <Christoph.Egger@xxxxxxx>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; version 2.1 only.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- */
-
-#include "libxl_osdeps.h" /* must come before any other headers */
-
-#include "libxl_internal.h"
-
-int libxl__blktap_enabled(libxl__gc *gc)
-{
- return 0;
-}
-
-char *libxl__blktap_devpath(libxl__gc *gc,
- const char *disk,
- libxl_disk_format format)
-{
- return NULL;
-}
-
-int libxl__device_destroy_tapdisk(libxl__gc *gc, const char *params)
-{
- return 0;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/tools/xenstore/hashtable.c b/tools/xenstore/hashtable.c
index 0ba1d55..394b1cf 100644
--- a/tools/xenstore/hashtable.c
+++ b/tools/xenstore/hashtable.c
@@ -1,10 +1,5 @@
/* Copyright (C) 2004 Christopher Clark <firstname.lastname@xxxxxxxxx.uk> */

-/*
- * There are duplicates of this code in:
- * - tools/blktap2/drivers/hashtable.c
- */
-
#include "hashtable.h"
#include "hashtable_private.h"
#include <stdlib.h>
diff --git a/tools/xenstore/hashtable.h b/tools/xenstore/hashtable.h
index 4d68223..b90781a 100644
--- a/tools/xenstore/hashtable.h
+++ b/tools/xenstore/hashtable.h
@@ -1,10 +1,5 @@
/* Copyright (C) 2002 Christopher Clark <firstname.lastname@xxxxxxxxx.uk> */

-/*
- * There are duplicates of this code in:
- * - tools/blktap2/drivers/hashtable.h
- */
-
#ifndef __HASHTABLE_CWC22_H__
#define __HASHTABLE_CWC22_H__

diff --git a/tools/xenstore/hashtable_private.h b/tools/xenstore/hashtable_private.h
index a08559d..3e95f60 100644
--- a/tools/xenstore/hashtable_private.h
+++ b/tools/xenstore/hashtable_private.h
@@ -1,10 +1,5 @@
/* Copyright (C) 2002, 2004 Christopher Clark <firstname.lastname@xxxxxxxxx.uk> */

-/*
- * There are duplicates of this code in:
- * - tools/blktap2/drivers/hashtable_private.h
- */
-
#ifndef __HASHTABLE_PRIVATE_CWC22_H__
#define __HASHTABLE_PRIVATE_CWC22_H__

--
2.1.4

Thanks,

Yang

Re: [Xen-devel] [RFC PATCH] tools: remove blktap2 related code and documentation