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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 04/10] libxl: convert libxl_device_disk_add to an asyn op
This patch converts libxl_device_disk_add to an ao operation that
waits for device backend to reach state XenbusStateInitWait and then
marks the operation as completed. This is not really useful now, but
will be used by latter patches that will launch hotplug scripts after
we reached the desired xenbus state.
As usual, libxl_device_disk_add callers have been modified, and the
internal function libxl__device_disk_add has been used if the call was
inside an already running ao.
Changes since v2:
* Remove state read from libxl__initiate_device_add
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxx>
---
tools/libxl/Makefile | 2 +-
tools/libxl/libxl.c | 50 ++++++++++++++++++++++++++--------
tools/libxl/libxl.h | 4 ++-
tools/libxl/libxl_create.c | 41 ++++++++++++++++++++++------
tools/libxl/libxl_device.c | 48 +++++++++++++++++++++++++++++++++
tools/libxl/libxl_dm.c | 61 +++++++++++++++++++++++++++++++----------
tools/libxl/libxl_internal.h | 26 ++++++++++++++++++
tools/libxl/xl_cmdimpl.c | 2 +-
8 files changed, 195 insertions(+), 39 deletions(-)
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 5d9227e..81b467e 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -13,7 +13,7 @@ XLUMINOR = 0
CFLAGS += -Werror -Wno-format-zero-length -Wmissing-declarations \
-Wno-declaration-after-statement -Wformat-nonliteral
-CFLAGS += -I. -fPIC
+CFLAGS += -I. -fPIC -O0
ifeq ($(CONFIG_Linux),y)
LIBUUID_LIBS += -luuid
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 0b3eb48..7147869 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1540,13 +1540,31 @@ static int libxl__device_from_disk(libxl__gc *gc,
uint32_t domid,
return 0;
}
-int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid, libxl_device_disk
*disk)
+int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid,
+ libxl_device_disk *disk,
+ const libxl_asyncop_how *ao_how)
{
- GC_INIT(ctx);
+ AO_CREATE(ctx, domid, ao_how);
+ libxl__ao_device *device;
+
+ GCNEW(device);
+ libxl__prepare_ao_device(device, ao, NULL);
+ device->callback = device_addrm_aocomplete;
+ libxl__device_disk_add(egc, domid, disk, device);
+
+ return AO_INPROGRESS;
+}
+
+void libxl__device_disk_add(libxl__egc *egc, uint32_t domid,
+ libxl_device_disk *disk,
+ libxl__ao_device *aodev)
+{
+ STATE_AO_GC(aodev->ao);
+ libxl_ctx *ctx = CTX;
flexarray_t *front;
flexarray_t *back;
char *dev;
- libxl__device device;
+ libxl__device *device;
int major, minor, rc;
rc = libxl__device_disk_setdefault(gc, disk);
@@ -1570,7 +1588,8 @@ int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid,
libxl_device_disk *dis
goto out_free;
}
- rc = libxl__device_from_disk(gc, domid, disk, &device);
+ GCNEW(device);
+ rc = libxl__device_from_disk(gc, domid, disk, device);
if (rc != 0) {
LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "Invalid or unsupported"
" virtual disk identifier %s", disk->vdev);
@@ -1588,7 +1607,7 @@ int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid,
libxl_device_disk *dis
flexarray_append(back, "params");
flexarray_append(back, dev);
- assert(device.backend_kind == LIBXL__DEVICE_KIND_VBD);
+ assert(device->backend_kind == LIBXL__DEVICE_KIND_VBD);
break;
case LIBXL_DISK_BACKEND_TAP:
dev = libxl__blktap_devpath(gc, disk->pdev_path, disk->format);
@@ -1609,7 +1628,7 @@ int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid,
libxl_device_disk *dis
flexarray_append(back, "params");
flexarray_append(back, libxl__sprintf(gc, "%s:%s",
libxl__device_disk_string_of_format(disk->format),
disk->pdev_path));
- assert(device.backend_kind == LIBXL__DEVICE_KIND_QDISK);
+ assert(device->backend_kind == LIBXL__DEVICE_KIND_QDISK);
break;
default:
LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "unrecognized disk backend type:
%d\n", disk->backend);
@@ -1641,22 +1660,27 @@ int libxl_device_disk_add(libxl_ctx *ctx, uint32_t
domid, libxl_device_disk *dis
flexarray_append(front, "state");
flexarray_append(front, libxl__sprintf(gc, "%d", 1));
flexarray_append(front, "virtual-device");
- flexarray_append(front, libxl__sprintf(gc, "%d", device.devid));
+ flexarray_append(front, libxl__sprintf(gc, "%d", device->devid));
flexarray_append(front, "device-type");
flexarray_append(front, disk->is_cdrom ? "cdrom" : "disk");
- libxl__device_generic_add(gc, &device,
+ libxl__device_generic_add(gc, device,
libxl__xs_kvs_of_flexarray(gc, back, back->count),
libxl__xs_kvs_of_flexarray(gc, front,
front->count));
+ aodev->dev = device;
+ aodev->action = DEVICE_CONNECT;
+ libxl__initiate_device_add(egc, aodev);
+
rc = 0;
out_free:
flexarray_free(back);
flexarray_free(front);
out:
- GC_FREE;
- return rc;
+ aodev->rc = rc;
+ if (rc) aodev->callback(egc, aodev);
+ return;
}
static void libxl__device_disk_from_xs_be(libxl__gc *gc,
@@ -1859,11 +1883,13 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid,
libxl_device_disk *disk)
ret = 0;
libxl_device_disk_remove(ctx, domid, disks + i, 0);
- libxl_device_disk_add(ctx, domid, disk);
+ /* fixme-ao */
+ libxl_device_disk_add(ctx, domid, disk, 0);
stubdomid = libxl_get_stubdom_id(ctx, domid);
if (stubdomid) {
libxl_device_disk_remove(ctx, stubdomid, disks + i, 0);
- libxl_device_disk_add(ctx, stubdomid, disk);
+ /* fixme-ao */
+ libxl_device_disk_add(ctx, stubdomid, disk, 0);
}
out:
for (i = 0; i < num; i++)
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 7933809..44c3949 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -670,7 +670,9 @@ void libxl_vminfo_list_free(libxl_vminfo *list, int nr);
*/
/* Disks */
-int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid, libxl_device_disk
*disk);
+int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid,
+ libxl_device_disk *disk,
+ const libxl_asyncop_how *ao_how);
int libxl_device_disk_remove(libxl_ctx *ctx, uint32_t domid,
libxl_device_disk *disk,
const libxl_asyncop_how *ao_how);
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 4e88551..d1a4016 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -575,6 +575,8 @@ static void domcreate_bootloader_done(libxl__egc *egc,
libxl__bootloader_state *bl,
int rc);
+static void domcreate_disk_connected(libxl__egc *egc, libxl__ao_device *aodev);
+
static void domcreate_console_available(libxl__egc *egc,
libxl__domain_create_state *dcs);
@@ -670,7 +672,6 @@ static void domcreate_bootloader_done(libxl__egc *egc,
{
libxl__domain_create_state *dcs = CONTAINER_OF(bl, *dcs, bl);
STATE_AO_GC(bl->ao);
- int i;
/* convenience aliases */
const uint32_t domid = dcs->guest_domid;
@@ -704,15 +705,37 @@ static void domcreate_bootloader_done(libxl__egc *egc,
store_libxl_entry(gc, domid, &d_config->b_info);
- for (i = 0; i < d_config->num_disks; i++) {
- ret = libxl_device_disk_add(ctx, domid, &d_config->disks[i]);
- if (ret) {
- LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
- "cannot add disk %d to domain: %d", i, ret);
- ret = ERROR_FAIL;
- goto error_out;
- }
+ dcs->num_devices = d_config->num_disks;
+ libxl__add_disks(egc, ao, domid, d_config, &dcs->devices,
+ domcreate_disk_connected);
+
+ return;
+
+ error_out:
+ assert(ret);
+ domcreate_complete(egc, dcs, ret);
+}
+
+static void domcreate_disk_connected(libxl__egc *egc, libxl__ao_device *aodev)
+{
+ STATE_AO_GC(aodev->ao);
+ libxl__domain_create_state *dcs = CONTAINER_OF(aodev->base, *dcs, devices);
+ int i, ret = 0;
+
+ /* convenience aliases */
+ const uint32_t domid = dcs->guest_domid;
+ libxl_domain_config *const d_config = dcs->guest_config;
+ libxl__domain_build_state *const state = &dcs->build_state;
+ libxl_ctx *const ctx = CTX;
+
+ ret = libxl__ao_device_check_last(gc, aodev, dcs->devices,
+ dcs->num_devices);
+ if (ret > 0) return;
+ if (ret) {
+ LOG(ERROR, "error connecting disk devices");
+ goto error_out;
}
+
for (i = 0; i < d_config->num_vifs; i++) {
ret = libxl_device_nic_add(ctx, domid, &d_config->vifs[i]);
if (ret) {
diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 413b98f..6c9bbc2 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -426,6 +426,24 @@ int libxl__ao_device_check_last(libxl__gc *gc,
libxl__ao_device *device,
return pending == 0 ? error : 1;
}
+void libxl__add_disks(libxl__egc *egc, libxl__ao *ao, uint32_t domid,
+ libxl_domain_config *d_config,
+ libxl__ao_device **devices,
+ libxl__device_callback callback)
+{
+ AO_GC;
+ GCNEW_ARRAY(*devices, d_config->num_disks);
+ libxl__ao_device *aodev = *devices;
+ int i;
+
+ for (i = 0; i < d_config->num_disks; i++) {
+ libxl__prepare_ao_device(&aodev[i], ao, devices);
+ aodev[i].callback = callback;
+ libxl__device_disk_add(egc, domid, &d_config->disks[i],
+ &aodev[i]);
+ }
+}
+
int libxl__device_destroy(libxl__gc *gc, libxl__device *dev)
{
libxl_ctx *ctx = libxl__gc_owner(gc);
@@ -533,6 +551,36 @@ static void device_backend_callback(libxl__egc *egc,
libxl__ev_devstate *ds,
static void device_backend_cleanup(libxl__gc *gc,
libxl__ao_device *aodev);
+void libxl__initiate_device_add(libxl__egc *egc, libxl__ao_device *aodev)
+{
+ STATE_AO_GC(aodev->ao);
+ char *be_path = libxl__device_backend_path(gc, aodev->dev);
+ char *state_path = libxl__sprintf(gc, "%s/state", be_path);
+ int rc = 0;
+
+ if (aodev->dev->backend_kind == LIBXL__DEVICE_KIND_QDISK) {
+ aodev->callback(egc, aodev);
+ return;
+ }
+
+ libxl__ev_devstate_init(&aodev->ds);
+ rc = libxl__ev_devstate_wait(gc, &aodev->ds, device_backend_callback,
+ state_path, XenbusStateInitWait,
+ LIBXL_INIT_TIMEOUT * 1000);
+ if (rc) {
+ LOGE(ERROR, "unable to initialize device %s", be_path);
+ goto out_fail;
+ }
+
+ return;
+
+out_fail:
+ assert(rc);
+ aodev->rc = rc;
+ aodev->callback(egc, aodev);
+ return;
+}
+
void libxl__initiate_device_remove(libxl__egc *egc,
libxl__ao_device *aodev)
{
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index a403b4c..9903fb7 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -673,6 +673,8 @@ static void spawn_stubdom_pvqemu_cb(libxl__egc *egc,
libxl__dm_spawn_state *stubdom_dmss,
int rc);
+static void spawn_stub_disk_connected(libxl__egc *egc, libxl__ao_device
*aodev);
+
static void spaw_stubdom_pvqemu_destroy_cb(libxl__egc *egc,
libxl__destroy_domid_state *dis,
int rc);
@@ -681,8 +683,7 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
{
STATE_AO_GC(sdss->dm.spawn.ao);
libxl_ctx *ctx = libxl__gc_owner(gc);
- int i, num_console = STUBDOM_SPECIAL_CONSOLES, ret;
- libxl__device_console *console;
+ int ret;
libxl_device_vfb vfb;
libxl_device_vkb vkb;
char **args;
@@ -800,22 +801,55 @@ retry_transaction:
if (errno == EAGAIN)
goto retry_transaction;
- for (i = 0; i < dm_config->num_disks; i++) {
- ret = libxl_device_disk_add(ctx, dm_domid, &dm_config->disks[i]);
- if (ret)
- goto out_free;
- }
+ sdss->num_devices = dm_config->num_disks;
+ libxl__add_disks(egc, ao, dm_domid, dm_config, &sdss->devices,
+ spawn_stub_disk_connected);
+
+ free(args);
+ return;
+
+out_free:
+ free(args);
+out:
+ assert(ret);
+ spawn_stubdom_pvqemu_cb(egc, &sdss->pvqemu, ret);
+}
+
+static void spawn_stub_disk_connected(libxl__egc *egc, libxl__ao_device *aodev)
+{
+ STATE_AO_GC(aodev->ao);
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ libxl__stub_dm_spawn_state *sdss = CONTAINER_OF(aodev->base, *sdss,
devices);
+ int i, num_console = STUBDOM_SPECIAL_CONSOLES, ret = 0;
+ libxl__device_console *console;
+
+ /* convenience aliases */
+ libxl_domain_config *const dm_config = &sdss->dm_config;
+ libxl_domain_config *const guest_config = sdss->dm.guest_config;
+ const int guest_domid = sdss->dm.guest_domid;
+ libxl__domain_build_state *const d_state = sdss->dm.build_state;
+ libxl__domain_build_state *const stubdom_state = &sdss->dm_state;
+ uint32_t dm_domid = sdss->pvqemu.guest_domid;
+
+ ret = libxl__ao_device_check_last(gc, aodev, sdss->devices,
+ sdss->num_devices);
+ if (ret > 0) return;
+ if (ret) {
+ LOG(ERROR, "error connecting disk devices");
+ goto out;
+ }
+
for (i = 0; i < dm_config->num_vifs; i++) {
ret = libxl_device_nic_add(ctx, dm_domid, &dm_config->vifs[i]);
if (ret)
- goto out_free;
+ goto out;
}
ret = libxl_device_vfb_add(ctx, dm_domid, &dm_config->vfbs[0]);
if (ret)
- goto out_free;
+ goto out;
ret = libxl_device_vkb_add(ctx, dm_domid, &dm_config->vkbs[0]);
if (ret)
- goto out_free;
+ goto out;
if (guest_config->b_info.u.hvm.serial)
num_console++;
@@ -823,7 +857,7 @@ retry_transaction:
console = libxl__calloc(gc, num_console, sizeof(libxl__device_console));
if (!console) {
ret = ERROR_NOMEM;
- goto out_free;
+ goto out;
}
for (i = 0; i < num_console; i++) {
@@ -859,7 +893,7 @@ retry_transaction:
ret = libxl__device_console_add(gc, dm_domid, &console[i],
i == STUBDOM_CONSOLE_LOGGING ? stubdom_state : NULL);
if (ret)
- goto out_free;
+ goto out;
}
sdss->pvqemu.spawn.ao = ao;
@@ -870,11 +904,8 @@ retry_transaction:
libxl__spawn_local_dm(egc, &sdss->pvqemu);
- free(args);
return;
-out_free:
- free(args);
out:
assert(ret);
spawn_stubdom_pvqemu_cb(egc, &sdss->pvqemu, ret);
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 9003583..963e734 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -70,6 +70,7 @@
#include "_libxl_types_internal.h"
#include "_libxl_types_internal_json.h"
+#define LIBXL_INIT_TIMEOUT 10
#define LIBXL_DESTROY_TIMEOUT 10
#define LIBXL_DEVICE_MODEL_START_TIMEOUT 10
#define LIBXL_XENCONSOLE_LIMIT 1048576
@@ -1812,6 +1813,19 @@ struct libxl__ao_device {
void *base;
};
+/* Internal AO operation to connect a disk device */
+_hidden void libxl__device_disk_add(libxl__egc *egc, uint32_t domid,
+ libxl_device_disk *disk,
+ libxl__ao_device *aodev);
+
+/* Arranges that dev will be added to the guest, and the
+ * hotplug scripts will be executed (if necessary). When
+ * this is done (or an error happens), the callback in
+ * aodev->callback will be called.
+ */
+_hidden void libxl__initiate_device_add(libxl__egc*, libxl__ao_device *aodev);
+
+
/* Arranges that dev will be removed to the guest, and the
* hotplug scripts will be executed (if necessary). When
* this is done (or an error happens), the callback in
@@ -1901,6 +1915,12 @@ _hidden void libxl__destroy_domid(libxl__egc *egc,
_hidden void libxl__devices_destroy(libxl__egc *egc,
libxl__devices_remove_state *drs);
+/* Helper function to add a bunch of disks */
+void libxl__add_disks(libxl__egc *egc, libxl__ao *ao, uint32_t domid,
+ libxl_domain_config *d_config,
+ libxl__ao_device **devices,
+ libxl__device_callback callback);
+
/*----- device model creation -----*/
/* First layer; wraps libxl__spawn_spawn. */
@@ -1935,6 +1955,9 @@ typedef struct {
libxl__domain_build_state dm_state;
libxl__dm_spawn_state pvqemu;
libxl__destroy_domid_state dis;
+ /* used to store the state of devices being connected */
+ libxl__ao_device *devices;
+ int num_devices;
} libxl__stub_dm_spawn_state;
_hidden void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state*);
@@ -1963,6 +1986,9 @@ struct libxl__domain_create_state {
* for the non-stubdom device model. */
/* necessary if the domain creation failed and we have to destroy it */
libxl__domain_destroy_state dds;
+ /* used to store the state of devices being connected */
+ libxl__ao_device *devices;
+ int num_devices;
};
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index ecd7222..5f15b4c 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5334,7 +5334,7 @@ int main_blockattach(int argc, char **argv)
return 0;
}
- if (libxl_device_disk_add(ctx, fe_domid, &disk)) {
+ if (libxl_device_disk_add(ctx, fe_domid, &disk, 0)) {
fprintf(stderr, "libxl_device_disk_add failed.\n");
}
return 0;
--
1.7.7.5 (Apple Git-26)
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