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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 06/12] libxl: carve out disk specific functions from libxl.c
libxl.c has grown to an uncomfortable size. Carve out the disk
related functions to libxl_disk.c.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
tools/libxl/Makefile | 2 +-
tools/libxl/libxl.c | 1233 ---------------------------------------------
tools/libxl/libxl_disk.c | 1258 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1259 insertions(+), 1234 deletions(-)
create mode 100644 tools/libxl/libxl_disk.c
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 7514cc2..baf591d 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -136,7 +136,7 @@ LIBXL_OBJS = flexarray.o libxl.o libxl_create.o libxl_dm.o
libxl_pci.o \
libxl_save_callout.o _libxl_save_msgs_callout.o \
libxl_qmp.o libxl_event.o libxl_fork.o \
libxl_dom_suspend.o libxl_dom_save.o libxl_usb.o \
- libxl_vtpm.o libxl_nic.o \
+ libxl_vtpm.o libxl_nic.o libxl_disk.o \
libxl_cpupool.o libxl_sched.o \
$(LIBXL_OBJS-y)
LIBXL_OBJS += libxl_genid.o
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index ae6c7d4..3f8f16e 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -18,7 +18,6 @@
#include "libxl_arch.h"
#define PAGE_TO_MEMKB(pages) ((pages) * 4)
-#define BACKEND_STRING_SIZE 5
int libxl_ctx_alloc(libxl_ctx **pctx, int version,
unsigned flags, xentoollog_logger * lg)
@@ -1197,140 +1196,6 @@ void libxl_evdisable_domain_death(libxl_ctx *ctx,
GC_FREE;
}
-static void disk_eject_xswatch_callback(libxl__egc *egc, libxl__ev_xswatch *w,
- const char *wpath, const char *epath) {
- EGC_GC;
- libxl_evgen_disk_eject *evg = (void*)w;
- const char *backend;
- char *value;
- char backend_type[BACKEND_STRING_SIZE+1];
- int rc;
-
- value = libxl__xs_read(gc, XBT_NULL, wpath);
-
- if (!value || strcmp(value, "eject"))
- return;
-
- if (libxl__xs_printf(gc, XBT_NULL, wpath, "")) {
- LIBXL__EVENT_DISASTER(egc, "xs_write failed acknowledging eject",
- errno, LIBXL_EVENT_TYPE_DISK_EJECT);
- return;
- }
-
- libxl_event *ev = NEW_EVENT(egc, DISK_EJECT, evg->domid, evg->user);
- libxl_device_disk *disk = &ev->u.disk_eject.disk;
-
- rc = libxl__xs_read_checked(gc, XBT_NULL, evg->be_ptr_path, &backend);
- if (rc) {
- LIBXL__EVENT_DISASTER(egc, "xs_read failed reading be_ptr_path",
- errno, LIBXL_EVENT_TYPE_DISK_EJECT);
- return;
- }
- if (!backend) {
- /* device has been removed, not simply ejected */
- return;
- }
-
- sscanf(backend,
- "/local/domain/%d/backend/%" TOSTRING(BACKEND_STRING_SIZE)
- "[a-z]/%*d/%*d",
- &disk->backend_domid, backend_type);
- if (!strcmp(backend_type, "tap") || !strcmp(backend_type, "vbd")) {
- disk->backend = LIBXL_DISK_BACKEND_TAP;
- } else if (!strcmp(backend_type, "qdisk")) {
- disk->backend = LIBXL_DISK_BACKEND_QDISK;
- } else {
- disk->backend = LIBXL_DISK_BACKEND_UNKNOWN;
- }
-
- disk->pdev_path = strdup(""); /* xxx fixme malloc failure */
- disk->format = LIBXL_DISK_FORMAT_EMPTY;
- /* this value is returned to the user: do not free right away */
- disk->vdev = libxl__strdup(NOGC, evg->vdev);
- disk->removable = 1;
- disk->readwrite = 0;
- disk->is_cdrom = 1;
-
- libxl__event_occurred(egc, ev);
-}
-
-int libxl_evenable_disk_eject(libxl_ctx *ctx, uint32_t guest_domid,
- const char *vdev, libxl_ev_user user,
- libxl_evgen_disk_eject **evgen_out) {
- GC_INIT(ctx);
- CTX_LOCK;
- int rc;
- char *path;
- libxl_evgen_disk_eject *evg = NULL;
-
- evg = malloc(sizeof(*evg)); if (!evg) { rc = ERROR_NOMEM; goto out; }
- memset(evg, 0, sizeof(*evg));
- evg->user = user;
- evg->domid = guest_domid;
- LIBXL_LIST_INSERT_HEAD(&CTX->disk_eject_evgens, evg, entry);
-
- uint32_t domid = libxl_get_stubdom_id(ctx, guest_domid);
-
- if (!domid)
- domid = guest_domid;
-
- int devid = libxl__device_disk_dev_number(vdev, NULL, NULL);
-
- path = GCSPRINTF("%s/device/vbd/%d/eject",
- libxl__xs_get_dompath(gc, domid),
- devid);
- if (!path) { rc = ERROR_NOMEM; goto out; }
-
- const char *libxl_path = GCSPRINTF("%s/device/vbd/%d",
- libxl__xs_libxl_path(gc, domid),
- devid);
- evg->be_ptr_path = libxl__sprintf(NOGC, "%s/backend", libxl_path);
-
- const char *configured_vdev;
- rc = libxl__xs_read_checked(gc, XBT_NULL,
- GCSPRINTF("%s/dev", libxl_path), &configured_vdev);
- if (rc) goto out;
-
- evg->vdev = libxl__strdup(NOGC, configured_vdev);
-
- rc = libxl__ev_xswatch_register(gc, &evg->watch,
- disk_eject_xswatch_callback, path);
- if (rc) goto out;
-
- *evgen_out = evg;
- CTX_UNLOCK;
- GC_FREE;
- return 0;
-
- out:
- if (evg)
- libxl__evdisable_disk_eject(gc, evg);
- CTX_UNLOCK;
- GC_FREE;
- return rc;
-}
-
-void libxl__evdisable_disk_eject(libxl__gc *gc, libxl_evgen_disk_eject *evg) {
- CTX_LOCK;
-
- LIBXL_LIST_REMOVE(evg, entry);
-
- if (libxl__ev_xswatch_isregistered(&evg->watch))
- libxl__ev_xswatch_deregister(gc, &evg->watch);
-
- free(evg->vdev);
- free(evg->be_ptr_path);
- free(evg);
-
- CTX_UNLOCK;
-}
-
-void libxl_evdisable_disk_eject(libxl_ctx *ctx, libxl_evgen_disk_eject *evg) {
- GC_INIT(ctx);
- libxl__evdisable_disk_eject(gc, evg);
- GC_FREE;
-}
-
/* Callbacks for libxl_domain_destroy */
static void domain_destroy_cb(libxl__egc *egc, libxl__domain_destroy_state
*dds,
@@ -1948,1044 +1813,6 @@ int libxl__resolve_domid(libxl__gc *gc, const char
*name, uint32_t *domid)
}
/******************************************************************************/
-
-int libxl__device_disk_setdefault(libxl__gc *gc, libxl_device_disk *disk,
- uint32_t domid)
-{
- int rc;
-
- libxl_defbool_setdefault(&disk->discard_enable, !!disk->readwrite);
- libxl_defbool_setdefault(&disk->colo_enable, false);
- libxl_defbool_setdefault(&disk->colo_restore_enable, false);
-
- rc = libxl__resolve_domid(gc, disk->backend_domname, &disk->backend_domid);
- if (rc < 0) return rc;
-
- /* Force Qdisk backend for CDROM devices of guests with a device model. */
- if (disk->is_cdrom != 0 &&
- libxl__domain_type(gc, domid) == LIBXL_DOMAIN_TYPE_HVM &&
- libxl__device_model_version_running(gc, domid) !=
- LIBXL_DEVICE_MODEL_VERSION_NONE) {
- if (!(disk->backend == LIBXL_DISK_BACKEND_QDISK ||
- disk->backend == LIBXL_DISK_BACKEND_UNKNOWN)) {
- LOGD(ERROR, domid, "Backend for CD devices on HVM guests must be
Qdisk");
- return ERROR_FAIL;
- }
- disk->backend = LIBXL_DISK_BACKEND_QDISK;
- }
-
- rc = libxl__device_disk_set_backend(gc, disk);
- return rc;
-}
-
-int libxl__device_from_disk(libxl__gc *gc, uint32_t domid,
- const libxl_device_disk *disk,
- libxl__device *device)
-{
- int devid;
-
- devid = libxl__device_disk_dev_number(disk->vdev, NULL, NULL);
- if (devid==-1) {
- LOGD(ERROR, domid, "Invalid or unsupported"" virtual disk identifier
%s",
- disk->vdev);
- return ERROR_INVAL;
- }
-
- device->backend_domid = disk->backend_domid;
- device->backend_devid = devid;
-
- switch (disk->backend) {
- case LIBXL_DISK_BACKEND_PHY:
- device->backend_kind = LIBXL__DEVICE_KIND_VBD;
- break;
- case LIBXL_DISK_BACKEND_TAP:
- device->backend_kind = LIBXL__DEVICE_KIND_VBD;
- break;
- case LIBXL_DISK_BACKEND_QDISK:
- device->backend_kind = LIBXL__DEVICE_KIND_QDISK;
- break;
- default:
- LOGD(ERROR, domid, "Unrecognized disk backend type: %d",
- disk->backend);
- return ERROR_INVAL;
- }
-
- device->domid = domid;
- device->devid = devid;
- device->kind = LIBXL__DEVICE_KIND_VBD;
-
- return 0;
-}
-
-/* Specific function called directly only by local disk attach,
- * all other users should instead use the regular
- * libxl__device_disk_add wrapper
- *
- * The (optionally) passed function get_vdev will be used to
- * set the vdev the disk should be attached to. When it is set the caller
- * must also pass get_vdev_user, which will be passed to get_vdev.
- *
- * The passed get_vdev function is also in charge of printing
- * the corresponding error message when appropiate.
- */
-static void device_disk_add(libxl__egc *egc, uint32_t domid,
- libxl_device_disk *disk,
- libxl__ao_device *aodev,
- char *get_vdev(libxl__gc *, void *,
- xs_transaction_t),
- void *get_vdev_user)
-{
- STATE_AO_GC(aodev->ao);
- flexarray_t *front = NULL;
- flexarray_t *back = NULL;
- char *dev = NULL, *script;
- libxl__device *device;
- int rc;
- libxl_ctx *ctx = gc->owner;
- xs_transaction_t t = XBT_NULL;
- libxl_domain_config d_config;
- libxl_device_disk disk_saved;
- libxl__domain_userdata_lock *lock = NULL;
-
- libxl_domain_config_init(&d_config);
- libxl_device_disk_init(&disk_saved);
- libxl_device_disk_copy(ctx, &disk_saved, disk);
-
- libxl_domain_type type = libxl__domain_type(gc, domid);
- if (type == LIBXL_DOMAIN_TYPE_INVALID) {
- rc = ERROR_FAIL;
- goto out;
- }
-
- /*
- * get_vdev != NULL -> local attach
- * get_vdev == NULL -> block attach
- *
- * We don't care about local attach state because it's only
- * intermediate state.
- */
- if (!get_vdev && aodev->update_json) {
- lock = libxl__lock_domain_userdata(gc, domid);
- if (!lock) {
- rc = ERROR_LOCK_FAIL;
- goto out;
- }
-
- rc = libxl__get_domain_configuration(gc, domid, &d_config);
- if (rc) goto out;
-
- DEVICE_ADD(disk, disks, domid, &disk_saved, COMPARE_DISK, &d_config);
-
- rc = libxl__dm_check_start(gc, &d_config, domid);
- if (rc) goto out;
- }
-
- for (;;) {
- rc = libxl__xs_transaction_start(gc, &t);
- if (rc) goto out;
-
- if (get_vdev) {
- assert(get_vdev_user);
- disk->vdev = get_vdev(gc, get_vdev_user, t);
- if (disk->vdev == NULL) {
- rc = ERROR_FAIL;
- goto out;
- }
- }
-
- rc = libxl__device_disk_setdefault(gc, disk, domid);
- if (rc) goto out;
-
- front = flexarray_make(gc, 16, 1);
- back = flexarray_make(gc, 16, 1);
-
- GCNEW(device);
- rc = libxl__device_from_disk(gc, domid, disk, device);
- if (rc != 0) {
- LOGD(ERROR, domid, "Invalid or unsupported"" virtual disk
identifier %s",
- disk->vdev);
- goto out;
- }
-
- rc = libxl__device_exists(gc, t, device);
- if (rc < 0) goto out;
- if (rc == 1) { /* already exists in xenstore */
- LOGD(ERROR, domid, "device already exists in xenstore");
- aodev->action = LIBXL__DEVICE_ACTION_ADD; /* for error message */
- rc = ERROR_DEVICE_EXISTS;
- goto out;
- }
-
- switch (disk->backend) {
- case LIBXL_DISK_BACKEND_PHY:
- dev = disk->pdev_path;
-
- do_backend_phy:
- flexarray_append(back, "params");
- flexarray_append(back, dev);
-
- script = libxl__abs_path(gc, disk->script?: "block",
- libxl__xen_script_dir_path());
- flexarray_append_pair(back, "script", script);
-
- assert(device->backend_kind == LIBXL__DEVICE_KIND_VBD);
- break;
-
- case LIBXL_DISK_BACKEND_TAP:
- if (dev == NULL) {
- dev = libxl__blktap_devpath(gc, disk->pdev_path,
- disk->format);
- if (!dev) {
- LOGD(ERROR, domid, "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;
- case LIBXL_DISK_BACKEND_QDISK:
- flexarray_append(back, "params");
- flexarray_append(back, GCSPRINTF("%s:%s",
-
libxl__device_disk_string_of_format(disk->format), disk->pdev_path));
- if (libxl_defbool_val(disk->colo_enable)) {
- flexarray_append(back, "colo-host");
- flexarray_append(back, libxl__sprintf(gc, "%s",
disk->colo_host));
- flexarray_append(back, "colo-port");
- flexarray_append(back, libxl__sprintf(gc, "%d",
disk->colo_port));
- flexarray_append(back, "colo-export");
- flexarray_append(back, libxl__sprintf(gc, "%s",
disk->colo_export));
- flexarray_append(back, "active-disk");
- flexarray_append(back, libxl__sprintf(gc, "%s",
disk->active_disk));
- flexarray_append(back, "hidden-disk");
- flexarray_append(back, libxl__sprintf(gc, "%s",
disk->hidden_disk));
- }
- assert(device->backend_kind == LIBXL__DEVICE_KIND_QDISK);
- break;
- default:
- LOGD(ERROR, domid, "Unrecognized disk backend type: %d",
- disk->backend);
- rc = ERROR_INVAL;
- goto out;
- }
-
- flexarray_append(back, "frontend-id");
- flexarray_append(back, GCSPRINTF("%d", domid));
- flexarray_append(back, "online");
- flexarray_append(back, "1");
- flexarray_append(back, "removable");
- flexarray_append(back, GCSPRINTF("%d", (disk->removable) ? 1 : 0));
- flexarray_append(back, "bootable");
- flexarray_append(back, GCSPRINTF("%d", 1));
- flexarray_append(back, "state");
- flexarray_append(back, GCSPRINTF("%d", XenbusStateInitialising));
- flexarray_append(back, "dev");
- flexarray_append(back, disk->vdev);
- flexarray_append(back, "type");
- flexarray_append(back,
libxl__device_disk_string_of_backend(disk->backend));
- flexarray_append(back, "mode");
- flexarray_append(back, disk->readwrite ? "w" : "r");
- flexarray_append(back, "device-type");
- flexarray_append(back, disk->is_cdrom ? "cdrom" : "disk");
- if (disk->direct_io_safe) {
- flexarray_append(back, "direct-io-safe");
- flexarray_append(back, "1");
- }
- flexarray_append_pair(back, "discard-enable",
- libxl_defbool_val(disk->discard_enable) ?
- "1" : "0");
-
- flexarray_append(front, "backend-id");
- flexarray_append(front, GCSPRINTF("%d", disk->backend_domid));
- flexarray_append(front, "state");
- flexarray_append(front, GCSPRINTF("%d", XenbusStateInitialising));
- flexarray_append(front, "virtual-device");
- flexarray_append(front, GCSPRINTF("%d", device->devid));
- flexarray_append(front, "device-type");
- flexarray_append(front, disk->is_cdrom ? "cdrom" : "disk");
-
- /*
- * Old PV kernel disk frontends before 2.6.26 rely on tool stack to
- * write disk native protocol to frontend node. Xend does this, port
- * this behaviour to xl.
- *
- * New kernels write this node themselves. In that case it just
- * overwrites an existing node which is OK.
- */
- if (type == LIBXL_DOMAIN_TYPE_PV) {
- const char *protocol =
- xc_domain_get_native_protocol(ctx->xch, domid);
- if (protocol) {
- flexarray_append(front, "protocol");
- flexarray_append(front, libxl__strdup(gc, protocol));
- }
- }
-
- if (!get_vdev && aodev->update_json) {
- rc = libxl__set_domain_configuration(gc, domid, &d_config);
- if (rc) goto out;
- }
-
- libxl__device_generic_add(gc, t, device,
- libxl__xs_kvs_of_flexarray(gc, back),
- libxl__xs_kvs_of_flexarray(gc, front),
- NULL);
-
- rc = libxl__xs_transaction_commit(gc, &t);
- if (!rc) break;
- if (rc < 0) goto out;
- }
-
- aodev->dev = device;
- aodev->action = LIBXL__DEVICE_ACTION_ADD;
- libxl__wait_device_connection(egc, aodev);
-
- rc = 0;
-
-out:
- libxl__xs_transaction_abort(gc, &t);
- if (lock) libxl__unlock_domain_userdata(lock);
- libxl_device_disk_dispose(&disk_saved);
- libxl_domain_config_dispose(&d_config);
- aodev->rc = rc;
- if (rc) aodev->callback(egc, aodev);
- return;
-}
-
-static void libxl__device_disk_add(libxl__egc *egc, uint32_t domid,
- libxl_device_disk *disk,
- libxl__ao_device *aodev)
-{
- device_disk_add(egc, domid, disk, aodev, NULL, NULL);
-}
-
-static int libxl__device_disk_from_xenstore(libxl__gc *gc,
- const char *libxl_path,
- libxl_device_disk *disk)
-{
- libxl_ctx *ctx = libxl__gc_owner(gc);
- unsigned int len;
- char *tmp;
- int rc;
-
- libxl_device_disk_init(disk);
-
- const char *backend_path;
- rc = libxl__xs_read_checked(gc, XBT_NULL,
- GCSPRINTF("%s/backend", libxl_path),
- &backend_path);
- if (rc) goto out;
-
- if (!backend_path) {
- LOG(ERROR, "disk %s does not exist (no backend path", libxl_path);
- rc = ERROR_FAIL;
- goto out;
- }
-
- rc = libxl__backendpath_parse_domid(gc, backend_path,
&disk->backend_domid);
- if (rc) {
- LOG(ERROR, "Unable to fetch device backend domid from %s",
backend_path);
- goto out;
- }
-
- /*
- * "params" may not be present; but everything else must be.
- * colo releated entries(colo-host, colo-port, colo-export,
- * active-disk and hidden-disk) are present only if colo is
- * enabled.
- */
- tmp = xs_read(ctx->xsh, XBT_NULL,
- GCSPRINTF("%s/params", libxl_path), &len);
- if (tmp && strchr(tmp, ':')) {
- disk->pdev_path = strdup(strchr(tmp, ':') + 1);
- free(tmp);
- } else {
- disk->pdev_path = tmp;
- }
-
- tmp = xs_read(ctx->xsh, XBT_NULL,
- GCSPRINTF("%s/colo-host", libxl_path), &len);
- if (tmp) {
- libxl_defbool_set(&disk->colo_enable, true);
- disk->colo_host = tmp;
-
- tmp = xs_read(ctx->xsh, XBT_NULL,
- GCSPRINTF("%s/colo-port", libxl_path), &len);
- if (!tmp) {
- LOG(ERROR, "Missing xenstore node %s/colo-port", libxl_path);
- goto cleanup;
- }
- disk->colo_port = atoi(tmp);
-
-#define XS_READ_COLO(param, item) do { \
- tmp = xs_read(ctx->xsh, XBT_NULL, \
- GCSPRINTF("%s/"#param"", libxl_path), &len); \
- if (!tmp) { \
- LOG(ERROR, "Missing xenstore node %s/"#param"", libxl_path); \
- goto cleanup; \
- } \
- disk->item = tmp; \
-} while (0)
- XS_READ_COLO(colo-export, colo_export);
- XS_READ_COLO(active-disk, active_disk);
- XS_READ_COLO(hidden-disk, hidden_disk);
-#undef XS_READ_COLO
- } else {
- libxl_defbool_set(&disk->colo_enable, false);
- }
-
- tmp = libxl__xs_read(gc, XBT_NULL,
- GCSPRINTF("%s/type", libxl_path));
- if (!tmp) {
- LOG(ERROR, "Missing xenstore node %s/type", libxl_path);
- goto cleanup;
- }
- libxl_string_to_backend(ctx, tmp, &(disk->backend));
-
- disk->vdev = xs_read(ctx->xsh, XBT_NULL,
- GCSPRINTF("%s/dev", libxl_path), &len);
- if (!disk->vdev) {
- LOG(ERROR, "Missing xenstore node %s/dev", libxl_path);
- goto cleanup;
- }
-
- tmp = libxl__xs_read(gc, XBT_NULL, libxl__sprintf
- (gc, "%s/removable", libxl_path));
- if (!tmp) {
- LOG(ERROR, "Missing xenstore node %s/removable", libxl_path);
- goto cleanup;
- }
- disk->removable = atoi(tmp);
-
- tmp = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/mode", libxl_path));
- if (!tmp) {
- LOG(ERROR, "Missing xenstore node %s/mode", libxl_path);
- goto cleanup;
- }
- if (!strcmp(tmp, "w"))
- disk->readwrite = 1;
- else
- disk->readwrite = 0;
-
- tmp = libxl__xs_read(gc, XBT_NULL,
- GCSPRINTF("%s/device-type", libxl_path));
- if (!tmp) {
- LOG(ERROR, "Missing xenstore node %s/device-type", libxl_path);
- goto cleanup;
- }
- disk->is_cdrom = !strcmp(tmp, "cdrom");
-
- disk->format = LIBXL_DISK_FORMAT_UNKNOWN;
-
- return 0;
-cleanup:
- rc = ERROR_FAIL;
- out:
- libxl_device_disk_dispose(disk);
- return rc;
-}
-
-int libxl_vdev_to_device_disk(libxl_ctx *ctx, uint32_t domid,
- const char *vdev, libxl_device_disk *disk)
-{
- GC_INIT(ctx);
- char *dom_xl_path, *libxl_path;
- int devid = libxl__device_disk_dev_number(vdev, NULL, NULL);
- int rc = ERROR_FAIL;
-
- if (devid < 0)
- return ERROR_INVAL;
-
- libxl_device_disk_init(disk);
-
- dom_xl_path = libxl__xs_libxl_path(gc, domid);
- if (!dom_xl_path) {
- goto out;
- }
- libxl_path = GCSPRINTF("%s/device/vbd/%d", dom_xl_path, devid);
-
- rc = libxl__device_disk_from_xenstore(gc, libxl_path, disk);
-out:
- GC_FREE;
- return rc;
-}
-
-static int libxl__append_disk_list(libxl__gc *gc,
- uint32_t domid,
- libxl_device_disk **disks,
- int *ndisks)
-{
- char *libxl_dir_path = NULL;
- char **dir = NULL;
- unsigned int n = 0;
- libxl_device_disk *pdisk = NULL, *pdisk_end = NULL;
- int rc=0;
- int initial_disks = *ndisks;
-
- libxl_dir_path = GCSPRINTF("%s/device/vbd",
- libxl__xs_libxl_path(gc, domid));
- dir = libxl__xs_directory(gc, XBT_NULL, libxl_dir_path, &n);
- if (dir && n) {
- libxl_device_disk *tmp;
- tmp = realloc(*disks, sizeof (libxl_device_disk) * (*ndisks + n));
- if (tmp == NULL)
- return ERROR_NOMEM;
- *disks = tmp;
- pdisk = *disks + initial_disks;
- pdisk_end = *disks + initial_disks + n;
- for (; pdisk < pdisk_end; pdisk++, dir++) {
- const char *p;
- p = GCSPRINTF("%s/%s", libxl_dir_path, *dir);
- if ((rc=libxl__device_disk_from_xenstore(gc, p, pdisk)))
- goto out;
- *ndisks += 1;
- }
- }
-out:
- return rc;
-}
-
-libxl_device_disk *libxl_device_disk_list(libxl_ctx *ctx, uint32_t domid, int
*num)
-{
- GC_INIT(ctx);
- libxl_device_disk *disks = NULL;
- int rc;
-
- *num = 0;
-
- rc = libxl__append_disk_list(gc, domid, &disks, num);
- if (rc) goto out_err;
-
- GC_FREE;
- return disks;
-
-out_err:
- LOG(ERROR, "Unable to list disks");
- while (disks && *num) {
- (*num)--;
- libxl_device_disk_dispose(&disks[*num]);
- }
- free(disks);
- return NULL;
-}
-
-int libxl_device_disk_getinfo(libxl_ctx *ctx, uint32_t domid,
- libxl_device_disk *disk, libxl_diskinfo
*diskinfo)
-{
- GC_INIT(ctx);
- char *dompath, *fe_path, *libxl_path;
- char *val;
- int rc;
-
- diskinfo->backend = NULL;
-
- dompath = libxl__xs_get_dompath(gc, domid);
- diskinfo->devid = libxl__device_disk_dev_number(disk->vdev, NULL, NULL);
-
- /* tap devices entries in xenstore are written as vbd devices. */
- fe_path = GCSPRINTF("%s/device/vbd/%d", dompath, diskinfo->devid);
- libxl_path = GCSPRINTF("%s/device/vbd/%d",
- libxl__xs_libxl_path(gc, domid), diskinfo->devid);
- diskinfo->backend = xs_read(ctx->xsh, XBT_NULL,
- GCSPRINTF("%s/backend", libxl_path), NULL);
- if (!diskinfo->backend) {
- GC_FREE;
- return ERROR_FAIL;
- }
- rc = libxl__backendpath_parse_domid(gc, diskinfo->backend,
- &diskinfo->backend_id);
- if (rc) goto out;
-
- val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/state", fe_path));
- diskinfo->state = val ? strtoul(val, NULL, 10) : -1;
- val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/event-channel", fe_path));
- diskinfo->evtch = val ? strtoul(val, NULL, 10) : -1;
- val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/ring-ref", fe_path));
- diskinfo->rref = val ? strtoul(val, NULL, 10) : -1;
- diskinfo->frontend = xs_read(ctx->xsh, XBT_NULL,
- GCSPRINTF("%s/frontend", libxl_path), NULL);
- diskinfo->frontend_id = domid;
-
- GC_FREE;
- return 0;
-
- out:
- free(diskinfo->backend);
- return rc;
-}
-
-int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
- const libxl_asyncop_how *ao_how)
-{
- AO_CREATE(ctx, domid, ao_how);
- int num = 0, i;
- libxl_device_disk *disks = NULL, disk_saved, disk_empty;
- libxl_domain_config d_config;
- int rc, dm_ver;
- libxl__device device;
- const char *be_path, *libxl_path;
- char * tmp;
- libxl__domain_userdata_lock *lock = NULL;
- xs_transaction_t t = XBT_NULL;
- flexarray_t *insert = NULL, *empty = NULL;
-
- libxl_domain_config_init(&d_config);
- libxl_device_disk_init(&disk_empty);
- libxl_device_disk_init(&disk_saved);
- libxl_device_disk_copy(ctx, &disk_saved, disk);
-
- disk_empty.format = LIBXL_DISK_FORMAT_EMPTY;
- disk_empty.vdev = libxl__strdup(NOGC, disk->vdev);
- disk_empty.pdev_path = libxl__strdup(NOGC, "");
- disk_empty.is_cdrom = 1;
- libxl__device_disk_setdefault(gc, &disk_empty, domid);
-
- libxl_domain_type type = libxl__domain_type(gc, domid);
- if (type == LIBXL_DOMAIN_TYPE_INVALID) {
- rc = ERROR_FAIL;
- goto out;
- }
- if (type != LIBXL_DOMAIN_TYPE_HVM) {
- LOGD(ERROR, domid, "cdrom-insert requires an HVM domain");
- rc = ERROR_INVAL;
- goto out;
- }
-
- if (libxl_get_stubdom_id(ctx, domid) != 0) {
- LOGD(ERROR, domid, "cdrom-insert doesn't work for stub domains");
- rc = ERROR_INVAL;
- goto out;
- }
-
- dm_ver = libxl__device_model_version_running(gc, domid);
- if (dm_ver == -1) {
- LOGD(ERROR, domid, "Cannot determine device model version");
- rc = ERROR_FAIL;
- goto out;
- }
-
- if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_NONE) {
- LOGD(ERROR, domid, "Guests without a device model cannot use
cd-insert");
- rc = ERROR_FAIL;
- goto out;
- }
-
- disks = libxl_device_disk_list(ctx, domid, &num);
- for (i = 0; i < num; i++) {
- if (disks[i].is_cdrom && !strcmp(disk->vdev, disks[i].vdev))
- {
- /* Found. Set backend type appropriately. */
- disk->backend=disks[i].backend;
- break;
- }
- }
- if (i == num) {
- LOGD(ERROR, domid, "Virtual device not found");
- rc = ERROR_FAIL;
- goto out;
- }
-
- rc = libxl__device_disk_setdefault(gc, disk, domid);
- if (rc) goto out;
-
- if (!disk->pdev_path) {
- disk->pdev_path = libxl__strdup(NOGC, "");
- disk->format = LIBXL_DISK_FORMAT_EMPTY;
- }
-
- rc = libxl__device_from_disk(gc, domid, disk, &device);
- if (rc) goto out;
-
- be_path = libxl__device_backend_path(gc, &device);
- libxl_path = libxl__device_libxl_path(gc, &device);
-
- insert = flexarray_make(gc, 4, 1);
-
- flexarray_append_pair(insert, "type",
- libxl__device_disk_string_of_backend(disk->backend));
- if (disk->format != LIBXL_DISK_FORMAT_EMPTY)
- flexarray_append_pair(insert, "params",
- GCSPRINTF("%s:%s",
- libxl__device_disk_string_of_format(disk->format),
- disk->pdev_path));
- else
- flexarray_append_pair(insert, "params", "");
-
- empty = flexarray_make(gc, 4, 1);
- flexarray_append_pair(empty, "type",
- libxl__device_disk_string_of_backend(disk->backend));
- flexarray_append_pair(empty, "params", "");
-
- /* Note: CTX lock is already held at this point so lock hierarchy
- * is maintained.
- */
- lock = libxl__lock_domain_userdata(gc, domid);
- if (!lock) {
- rc = ERROR_LOCK_FAIL;
- goto out;
- }
-
- /* We need to eject the original image first. This is implemented
- * by inserting empty media. JSON is not updated.
- */
- if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
- rc = libxl__qmp_insert_cdrom(gc, domid, &disk_empty);
- if (rc) goto out;
- }
-
- for (;;) {
- rc = libxl__xs_transaction_start(gc, &t);
- if (rc) goto out;
- /* Sanity check: make sure the device exists before writing here */
- tmp = libxl__xs_read(gc, t, GCSPRINTF("%s/frontend", libxl_path));
- if (!tmp)
- {
- LOGD(ERROR, domid, "Internal error: %s does not exist",
- GCSPRINTF("%s/frontend", libxl_path));
- rc = ERROR_FAIL;
- goto out;
- }
-
- char **kvs = libxl__xs_kvs_of_flexarray(gc, empty);
-
- rc = libxl__xs_writev(gc, t, be_path, kvs);
- if (rc) goto out;
-
- rc = libxl__xs_writev(gc, t, libxl_path, kvs);
- if (rc) goto out;
-
- rc = libxl__xs_transaction_commit(gc, &t);
- if (!rc) break;
- if (rc < 0) goto out;
- }
-
- rc = libxl__get_domain_configuration(gc, domid, &d_config);
- if (rc) goto out;
-
- DEVICE_ADD(disk, disks, domid, &disk_saved, COMPARE_DISK, &d_config);
-
- rc = libxl__dm_check_start(gc, &d_config, domid);
- if (rc) goto out;
-
- if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
- rc = libxl__qmp_insert_cdrom(gc, domid, disk);
- if (rc) goto out;
- }
-
- for (;;) {
- rc = libxl__xs_transaction_start(gc, &t);
- if (rc) goto out;
- /* Sanity check: make sure the device exists before writing here */
- tmp = libxl__xs_read(gc, t, GCSPRINTF("%s/frontend", libxl_path));
- if (!tmp)
- {
- LOGD(ERROR, domid, "Internal error: %s does not exist",
- GCSPRINTF("%s/frontend", libxl_path));
- rc = ERROR_FAIL;
- goto out;
- }
-
- rc = libxl__set_domain_configuration(gc, domid, &d_config);
- if (rc) goto out;
-
- char **kvs = libxl__xs_kvs_of_flexarray(gc, insert);
-
- rc = libxl__xs_writev(gc, t, be_path, kvs);
- if (rc) goto out;
-
- rc = libxl__xs_writev(gc, t, libxl_path, kvs);
- if (rc) goto out;
-
- rc = libxl__xs_transaction_commit(gc, &t);
- if (!rc) break;
- if (rc < 0) goto out;
- }
-
- /* success, no actual async */
- libxl__ao_complete(egc, ao, 0);
-
- rc = 0;
-
-out:
- libxl__xs_transaction_abort(gc, &t);
- for (i = 0; i < num; i++)
- libxl_device_disk_dispose(&disks[i]);
- free(disks);
- libxl_device_disk_dispose(&disk_empty);
- libxl_device_disk_dispose(&disk_saved);
- libxl_domain_config_dispose(&d_config);
-
- if (lock) libxl__unlock_domain_userdata(lock);
-
- if (rc) return AO_CREATE_FAIL(rc);
- return AO_INPROGRESS;
-}
-
-/* libxl__alloc_vdev only works on the local domain, that is the domain
- * where the toolstack is running */
-static char * libxl__alloc_vdev(libxl__gc *gc, void *get_vdev_user,
- xs_transaction_t t)
-{
- const char *blkdev_start = (const char *) get_vdev_user;
- int devid = 0, disk = 0, part = 0;
- char *libxl_dom_path = libxl__xs_libxl_path(gc, LIBXL_TOOLSTACK_DOMID);
-
- libxl__device_disk_dev_number(blkdev_start, &disk, &part);
- if (part != 0) {
- LOG(ERROR, "blkdev_start is invalid");
- return NULL;
- }
-
- do {
- devid = libxl__device_disk_dev_number(GCSPRINTF("d%dp0", disk),
- NULL, NULL);
- if (devid < 0)
- return NULL;
- if (libxl__xs_read(gc, t,
- GCSPRINTF("%s/device/vbd/%d/backend",
- libxl_dom_path, devid)) == NULL) {
- if (errno == ENOENT)
- return libxl__devid_to_vdev(gc, devid);
- else
- return NULL;
- }
- disk++;
- } while (1);
- return NULL;
-}
-
-/* Callbacks */
-
-char *libxl__device_disk_find_local_path(libxl__gc *gc,
- libxl_domid guest_domid,
- const libxl_device_disk *disk,
- bool qdisk_direct)
-{
- char *path = NULL;
-
- /* No local paths for driver domains */
- if (disk->backend_domname != NULL) {
- LOG(DEBUG, "Non-local backend, can't access locally.\n");
- goto out;
- }
-
- /*
- * If this is in raw format, and we're not using a script or a
- * driver domain, we can access the target path directly.
- */
- if (disk->format == LIBXL_DISK_FORMAT_RAW
- && disk->script == NULL) {
- path = libxl__strdup(gc, disk->pdev_path);
- LOG(DEBUG, "Directly accessing local RAW disk %s", path);
- goto out;
- }
-
- /*
- * If we're being called for a qemu path, we can pass the target
- * string directly as well
- */
- if (qdisk_direct && disk->backend == LIBXL_DISK_BACKEND_QDISK) {
- path = libxl__strdup(gc, disk->pdev_path);
- LOG(DEBUG, "Directly accessing local QDISK target %s", path);
- goto out;
- }
-
- /*
- * If the format isn't raw and / or we're using a script, then see
- * if the script has written a path to the "cooked" node
- */
- if (disk->script && guest_domid != INVALID_DOMID) {
- libxl__device device;
- char *be_path, *pdpath;
- int rc;
-
- LOGD(DEBUG, guest_domid,
- "Run from a script; checking for physical-device-path (vdev %s)",
- disk->vdev);
-
- rc = libxl__device_from_disk(gc, guest_domid, disk, &device);
- if (rc < 0)
- goto out;
-
- be_path = libxl__device_backend_path(gc, &device);
-
- pdpath = libxl__sprintf(gc, "%s/physical-device-path", be_path);
-
- LOGD(DEBUG, guest_domid, "Attempting to read node %s", pdpath);
- path = libxl__xs_read(gc, XBT_NULL, pdpath);
-
- if (path)
- LOGD(DEBUG, guest_domid, "Accessing cooked block device %s", path);
- else
- LOGD(DEBUG, guest_domid, "No physical-device-path, can't access
locally.");
-
- goto out;
- }
-
- out:
- return path;
-}
-
-static void local_device_attach_cb(libxl__egc *egc, libxl__ao_device *aodev);
-
-void libxl__device_disk_local_initiate_attach(libxl__egc *egc,
- libxl__disk_local_state *dls)
-{
- STATE_AO_GC(dls->ao);
- int rc;
- const libxl_device_disk *in_disk = dls->in_disk;
- libxl_device_disk *disk = &dls->disk;
- const char *blkdev_start = dls->blkdev_start;
-
- assert(in_disk->pdev_path);
-
- disk->vdev = NULL;
-
- if (dls->diskpath)
- LOG(DEBUG, "Strange, dls->diskpath already set: %s", dls->diskpath);
-
- LOG(DEBUG, "Trying to find local path");
-
- dls->diskpath = libxl__device_disk_find_local_path(gc, INVALID_DOMID,
- in_disk, false);
- if (dls->diskpath) {
- LOG(DEBUG, "Local path found, executing callback.");
- dls->callback(egc, dls, 0);
- } else {
- LOG(DEBUG, "Local path not found, initiating attach.");
-
- memcpy(disk, in_disk, sizeof(libxl_device_disk));
- disk->pdev_path = libxl__strdup(gc, in_disk->pdev_path);
- if (in_disk->script != NULL)
- disk->script = libxl__strdup(gc, in_disk->script);
- disk->vdev = NULL;
-
- rc = libxl__device_disk_setdefault(gc, disk, LIBXL_TOOLSTACK_DOMID);
- if (rc) goto out;
-
- libxl__prepare_ao_device(ao, &dls->aodev);
- dls->aodev.callback = local_device_attach_cb;
- device_disk_add(egc, LIBXL_TOOLSTACK_DOMID, disk, &dls->aodev,
- libxl__alloc_vdev, (void *) blkdev_start);
- }
-
- return;
-
- out:
- assert(rc);
- dls->rc = rc;
- libxl__device_disk_local_initiate_detach(egc, dls);
- dls->callback(egc, dls, rc);
-}
-
-static void local_device_attach_cb(libxl__egc *egc, libxl__ao_device *aodev)
-{
- STATE_AO_GC(aodev->ao);
- libxl__disk_local_state *dls = CONTAINER_OF(aodev, *dls, aodev);
- char *be_path = NULL;
- int rc;
- libxl__device device;
- libxl_device_disk *disk = &dls->disk;
-
- rc = aodev->rc;
- if (rc) {
- LOGE(ERROR, "unable locally attach device: %s", disk->pdev_path);
- goto out;
- }
-
- rc = libxl__device_from_disk(gc, LIBXL_TOOLSTACK_DOMID, disk, &device);
- if (rc < 0)
- goto out;
- be_path = libxl__device_backend_path(gc, &device);
- rc = libxl__wait_for_backend(gc, be_path, GCSPRINTF("%d",
XenbusStateConnected));
- if (rc < 0)
- goto out;
-
- dls->diskpath = GCSPRINTF("/dev/%s",
- libxl__devid_to_localdev(gc, device.devid));
- LOG(DEBUG, "locally attached disk %s", dls->diskpath);
-
- dls->callback(egc, dls, 0);
- return;
-
- out:
- assert(rc);
- dls->rc = rc;
- libxl__device_disk_local_initiate_detach(egc, dls);
- return;
-}
-
-/* Callbacks for local detach */
-
-static void local_device_detach_cb(libxl__egc *egc, libxl__ao_device *aodev);
-
-void libxl__device_disk_local_initiate_detach(libxl__egc *egc,
- libxl__disk_local_state *dls)
-{
- STATE_AO_GC(dls->ao);
- int rc = 0;
- libxl_device_disk *disk = &dls->disk;
- libxl__device *device;
- libxl__ao_device *aodev = &dls->aodev;
- libxl__prepare_ao_device(ao, aodev);
-
- if (!dls->diskpath) goto out;
-
- if (disk->vdev != NULL) {
- GCNEW(device);
- rc = libxl__device_from_disk(gc, LIBXL_TOOLSTACK_DOMID,
- disk, device);
- if (rc != 0) goto out;
-
- aodev->action = LIBXL__DEVICE_ACTION_REMOVE;
- aodev->dev = device;
- aodev->callback = local_device_detach_cb;
- aodev->force = 0;
- libxl__initiate_device_generic_remove(egc, aodev);
- return;
- }
-
-out:
- aodev->rc = rc;
- local_device_detach_cb(egc, aodev);
- return;
-}
-
-static void local_device_detach_cb(libxl__egc *egc, libxl__ao_device *aodev)
-{
- STATE_AO_GC(aodev->ao);
- libxl__disk_local_state *dls = CONTAINER_OF(aodev, *dls, aodev);
- int rc;
-
- if (aodev->rc) {
- LOGED(ERROR, aodev->dev->domid, "Unable to %s %s with id %u",
- libxl__device_action_to_string(aodev->action),
- libxl__device_kind_to_string(aodev->dev->kind),
- aodev->dev->devid);
- goto out;
- }
-
-out:
- /*
- * If there was an error in dls->rc, it means we have been called from
- * a failed execution of libxl__device_disk_local_initiate_attach,
- * so return the original error.
- */
- rc = dls->rc ? dls->rc : aodev->rc;
- dls->callback(egc, dls, rc);
- return;
-}
-
-/******************************************************************************/
int libxl__device_console_add(libxl__gc *gc, uint32_t domid,
libxl__device_console *console,
libxl__domain_build_state *state,
@@ -3520,10 +2347,6 @@ out:
/******************************************************************************/
/* The following functions are defined:
- * libxl_device_disk_add
- * libxl__add_disks
- * libxl_device_disk_remove
- * libxl_device_disk_destroy
* libxl_device_vkb_remove
* libxl_device_vkb_destroy
* libxl_device_vfb_remove
@@ -3534,11 +2357,6 @@ out:
* 1. add support for secondary consoles to xenconsoled
* 2. dynamically add/remove qemu chardevs via qmp messages. */
-/* disk */
-LIBXL_DEFINE_DEVICE_ADD(disk)
-LIBXL_DEFINE_DEVICES_ADD(disk)
-LIBXL_DEFINE_DEVICE_REMOVE(disk)
-
/* vkb */
LIBXL_DEFINE_DEVICE_REMOVE(vkb)
@@ -5644,57 +4462,6 @@ out:
return rc;
}
-static int libxl_device_disk_compare(libxl_device_disk *d1,
- libxl_device_disk *d2)
-{
- return COMPARE_DISK(d1, d2);
-}
-
-/* Take care of removable device. We maintain invariant in the
- * insert / remove operation so that:
- * 1. if xenstore is "empty" while JSON is not, the result
- * is "empty"
- * 2. if xenstore has a different media than JSON, use the
- * one in JSON
- * 3. if xenstore and JSON have the same media, well, you
- * know the answer :-)
- *
- * Currently there is only one removable device -- CDROM.
- * Look for libxl_cdrom_insert for reference.
- */
-static void libxl_device_disk_merge(libxl_ctx *ctx, void *d1, void *d2)
-{
- GC_INIT(ctx);
- libxl_device_disk *src = d1;
- libxl_device_disk *dst = d2;
-
- if (src->removable) {
- if (!src->pdev_path || *src->pdev_path == '\0') {
- /* 1, no media in drive */
- free(dst->pdev_path);
- dst->pdev_path = libxl__strdup(NOGC, "");
- dst->format = LIBXL_DISK_FORMAT_EMPTY;
- } else {
- /* 2 and 3, use JSON, no need to touch anything */
- ;
- }
- }
-}
-
-static int libxl_device_disk_dm_needed(void *e, unsigned domid)
-{
- libxl_device_disk *elem = e;
-
- return elem->backend == LIBXL_DISK_BACKEND_QDISK &&
- elem->backend_domid == domid;
-}
-
-DEFINE_DEVICE_TYPE_STRUCT(disk,
- .merge = libxl_device_disk_merge,
- .dm_needed = libxl_device_disk_dm_needed,
- .skip_attach = 1
-);
-
/*
* Local variables:
* mode: C
diff --git a/tools/libxl/libxl_disk.c b/tools/libxl/libxl_disk.c
new file mode 100644
index 0000000..ac49df2
--- /dev/null
+++ b/tools/libxl/libxl_disk.c
@@ -0,0 +1,1258 @@
+/*
+ * Copyright 2009-2017 Citrix Ltd and other contributors
+ *
+ * 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. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * 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"
+
+#include "libxl_internal.h"
+
+#define BACKEND_STRING_SIZE 5
+
+static void disk_eject_xswatch_callback(libxl__egc *egc, libxl__ev_xswatch *w,
+ const char *wpath, const char *epath) {
+ EGC_GC;
+ libxl_evgen_disk_eject *evg = (void*)w;
+ const char *backend;
+ char *value;
+ char backend_type[BACKEND_STRING_SIZE+1];
+ int rc;
+
+ value = libxl__xs_read(gc, XBT_NULL, wpath);
+
+ if (!value || strcmp(value, "eject"))
+ return;
+
+ if (libxl__xs_printf(gc, XBT_NULL, wpath, "")) {
+ LIBXL__EVENT_DISASTER(egc, "xs_write failed acknowledging eject",
+ errno, LIBXL_EVENT_TYPE_DISK_EJECT);
+ return;
+ }
+
+ libxl_event *ev = NEW_EVENT(egc, DISK_EJECT, evg->domid, evg->user);
+ libxl_device_disk *disk = &ev->u.disk_eject.disk;
+
+ rc = libxl__xs_read_checked(gc, XBT_NULL, evg->be_ptr_path, &backend);
+ if (rc) {
+ LIBXL__EVENT_DISASTER(egc, "xs_read failed reading be_ptr_path",
+ errno, LIBXL_EVENT_TYPE_DISK_EJECT);
+ return;
+ }
+ if (!backend) {
+ /* device has been removed, not simply ejected */
+ return;
+ }
+
+ sscanf(backend,
+ "/local/domain/%d/backend/%" TOSTRING(BACKEND_STRING_SIZE)
+ "[a-z]/%*d/%*d",
+ &disk->backend_domid, backend_type);
+ if (!strcmp(backend_type, "tap") || !strcmp(backend_type, "vbd")) {
+ disk->backend = LIBXL_DISK_BACKEND_TAP;
+ } else if (!strcmp(backend_type, "qdisk")) {
+ disk->backend = LIBXL_DISK_BACKEND_QDISK;
+ } else {
+ disk->backend = LIBXL_DISK_BACKEND_UNKNOWN;
+ }
+
+ disk->pdev_path = strdup(""); /* xxx fixme malloc failure */
+ disk->format = LIBXL_DISK_FORMAT_EMPTY;
+ /* this value is returned to the user: do not free right away */
+ disk->vdev = libxl__strdup(NOGC, evg->vdev);
+ disk->removable = 1;
+ disk->readwrite = 0;
+ disk->is_cdrom = 1;
+
+ libxl__event_occurred(egc, ev);
+}
+
+int libxl_evenable_disk_eject(libxl_ctx *ctx, uint32_t guest_domid,
+ const char *vdev, libxl_ev_user user,
+ libxl_evgen_disk_eject **evgen_out) {
+ GC_INIT(ctx);
+ CTX_LOCK;
+ int rc;
+ char *path;
+ libxl_evgen_disk_eject *evg = NULL;
+
+ evg = malloc(sizeof(*evg)); if (!evg) { rc = ERROR_NOMEM; goto out; }
+ memset(evg, 0, sizeof(*evg));
+ evg->user = user;
+ evg->domid = guest_domid;
+ LIBXL_LIST_INSERT_HEAD(&CTX->disk_eject_evgens, evg, entry);
+
+ uint32_t domid = libxl_get_stubdom_id(ctx, guest_domid);
+
+ if (!domid)
+ domid = guest_domid;
+
+ int devid = libxl__device_disk_dev_number(vdev, NULL, NULL);
+
+ path = GCSPRINTF("%s/device/vbd/%d/eject",
+ libxl__xs_get_dompath(gc, domid),
+ devid);
+ if (!path) { rc = ERROR_NOMEM; goto out; }
+
+ const char *libxl_path = GCSPRINTF("%s/device/vbd/%d",
+ libxl__xs_libxl_path(gc, domid),
+ devid);
+ evg->be_ptr_path = libxl__sprintf(NOGC, "%s/backend", libxl_path);
+
+ const char *configured_vdev;
+ rc = libxl__xs_read_checked(gc, XBT_NULL,
+ GCSPRINTF("%s/dev", libxl_path), &configured_vdev);
+ if (rc) goto out;
+
+ evg->vdev = libxl__strdup(NOGC, configured_vdev);
+
+ rc = libxl__ev_xswatch_register(gc, &evg->watch,
+ disk_eject_xswatch_callback, path);
+ if (rc) goto out;
+
+ *evgen_out = evg;
+ CTX_UNLOCK;
+ GC_FREE;
+ return 0;
+
+ out:
+ if (evg)
+ libxl__evdisable_disk_eject(gc, evg);
+ CTX_UNLOCK;
+ GC_FREE;
+ return rc;
+}
+
+void libxl__evdisable_disk_eject(libxl__gc *gc, libxl_evgen_disk_eject *evg) {
+ CTX_LOCK;
+
+ LIBXL_LIST_REMOVE(evg, entry);
+
+ if (libxl__ev_xswatch_isregistered(&evg->watch))
+ libxl__ev_xswatch_deregister(gc, &evg->watch);
+
+ free(evg->vdev);
+ free(evg->be_ptr_path);
+ free(evg);
+
+ CTX_UNLOCK;
+}
+
+void libxl_evdisable_disk_eject(libxl_ctx *ctx, libxl_evgen_disk_eject *evg) {
+ GC_INIT(ctx);
+ libxl__evdisable_disk_eject(gc, evg);
+ GC_FREE;
+}
+
+int libxl__device_disk_setdefault(libxl__gc *gc, libxl_device_disk *disk,
+ uint32_t domid)
+{
+ int rc;
+
+ libxl_defbool_setdefault(&disk->discard_enable, !!disk->readwrite);
+ libxl_defbool_setdefault(&disk->colo_enable, false);
+ libxl_defbool_setdefault(&disk->colo_restore_enable, false);
+
+ rc = libxl__resolve_domid(gc, disk->backend_domname, &disk->backend_domid);
+ if (rc < 0) return rc;
+
+ /* Force Qdisk backend for CDROM devices of guests with a device model. */
+ if (disk->is_cdrom != 0 &&
+ libxl__domain_type(gc, domid) == LIBXL_DOMAIN_TYPE_HVM &&
+ libxl__device_model_version_running(gc, domid) !=
+ LIBXL_DEVICE_MODEL_VERSION_NONE) {
+ if (!(disk->backend == LIBXL_DISK_BACKEND_QDISK ||
+ disk->backend == LIBXL_DISK_BACKEND_UNKNOWN)) {
+ LOGD(ERROR, domid, "Backend for CD devices on HVM guests must be
Qdisk");
+ return ERROR_FAIL;
+ }
+ disk->backend = LIBXL_DISK_BACKEND_QDISK;
+ }
+
+ rc = libxl__device_disk_set_backend(gc, disk);
+ return rc;
+}
+
+int libxl__device_from_disk(libxl__gc *gc, uint32_t domid,
+ const libxl_device_disk *disk,
+ libxl__device *device)
+{
+ int devid;
+
+ devid = libxl__device_disk_dev_number(disk->vdev, NULL, NULL);
+ if (devid==-1) {
+ LOGD(ERROR, domid, "Invalid or unsupported"" virtual disk identifier
%s",
+ disk->vdev);
+ return ERROR_INVAL;
+ }
+
+ device->backend_domid = disk->backend_domid;
+ device->backend_devid = devid;
+
+ switch (disk->backend) {
+ case LIBXL_DISK_BACKEND_PHY:
+ device->backend_kind = LIBXL__DEVICE_KIND_VBD;
+ break;
+ case LIBXL_DISK_BACKEND_TAP:
+ device->backend_kind = LIBXL__DEVICE_KIND_VBD;
+ break;
+ case LIBXL_DISK_BACKEND_QDISK:
+ device->backend_kind = LIBXL__DEVICE_KIND_QDISK;
+ break;
+ default:
+ LOGD(ERROR, domid, "Unrecognized disk backend type: %d",
+ disk->backend);
+ return ERROR_INVAL;
+ }
+
+ device->domid = domid;
+ device->devid = devid;
+ device->kind = LIBXL__DEVICE_KIND_VBD;
+
+ return 0;
+}
+
+/* Specific function called directly only by local disk attach,
+ * all other users should instead use the regular
+ * libxl__device_disk_add wrapper
+ *
+ * The (optionally) passed function get_vdev will be used to
+ * set the vdev the disk should be attached to. When it is set the caller
+ * must also pass get_vdev_user, which will be passed to get_vdev.
+ *
+ * The passed get_vdev function is also in charge of printing
+ * the corresponding error message when appropiate.
+ */
+static void device_disk_add(libxl__egc *egc, uint32_t domid,
+ libxl_device_disk *disk,
+ libxl__ao_device *aodev,
+ char *get_vdev(libxl__gc *, void *,
+ xs_transaction_t),
+ void *get_vdev_user)
+{
+ STATE_AO_GC(aodev->ao);
+ flexarray_t *front = NULL;
+ flexarray_t *back = NULL;
+ char *dev = NULL, *script;
+ libxl__device *device;
+ int rc;
+ libxl_ctx *ctx = gc->owner;
+ xs_transaction_t t = XBT_NULL;
+ libxl_domain_config d_config;
+ libxl_device_disk disk_saved;
+ libxl__domain_userdata_lock *lock = NULL;
+
+ libxl_domain_config_init(&d_config);
+ libxl_device_disk_init(&disk_saved);
+ libxl_device_disk_copy(ctx, &disk_saved, disk);
+
+ libxl_domain_type type = libxl__domain_type(gc, domid);
+ if (type == LIBXL_DOMAIN_TYPE_INVALID) {
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ /*
+ * get_vdev != NULL -> local attach
+ * get_vdev == NULL -> block attach
+ *
+ * We don't care about local attach state because it's only
+ * intermediate state.
+ */
+ if (!get_vdev && aodev->update_json) {
+ lock = libxl__lock_domain_userdata(gc, domid);
+ if (!lock) {
+ rc = ERROR_LOCK_FAIL;
+ goto out;
+ }
+
+ rc = libxl__get_domain_configuration(gc, domid, &d_config);
+ if (rc) goto out;
+
+ DEVICE_ADD(disk, disks, domid, &disk_saved, COMPARE_DISK, &d_config);
+
+ rc = libxl__dm_check_start(gc, &d_config, domid);
+ if (rc) goto out;
+ }
+
+ for (;;) {
+ rc = libxl__xs_transaction_start(gc, &t);
+ if (rc) goto out;
+
+ if (get_vdev) {
+ assert(get_vdev_user);
+ disk->vdev = get_vdev(gc, get_vdev_user, t);
+ if (disk->vdev == NULL) {
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ }
+
+ rc = libxl__device_disk_setdefault(gc, disk, domid);
+ if (rc) goto out;
+
+ front = flexarray_make(gc, 16, 1);
+ back = flexarray_make(gc, 16, 1);
+
+ GCNEW(device);
+ rc = libxl__device_from_disk(gc, domid, disk, device);
+ if (rc != 0) {
+ LOGD(ERROR, domid, "Invalid or unsupported"" virtual disk
identifier %s",
+ disk->vdev);
+ goto out;
+ }
+
+ rc = libxl__device_exists(gc, t, device);
+ if (rc < 0) goto out;
+ if (rc == 1) { /* already exists in xenstore */
+ LOGD(ERROR, domid, "device already exists in xenstore");
+ aodev->action = LIBXL__DEVICE_ACTION_ADD; /* for error message */
+ rc = ERROR_DEVICE_EXISTS;
+ goto out;
+ }
+
+ switch (disk->backend) {
+ case LIBXL_DISK_BACKEND_PHY:
+ dev = disk->pdev_path;
+
+ do_backend_phy:
+ flexarray_append(back, "params");
+ flexarray_append(back, dev);
+
+ script = libxl__abs_path(gc, disk->script?: "block",
+ libxl__xen_script_dir_path());
+ flexarray_append_pair(back, "script", script);
+
+ assert(device->backend_kind == LIBXL__DEVICE_KIND_VBD);
+ break;
+
+ case LIBXL_DISK_BACKEND_TAP:
+ if (dev == NULL) {
+ dev = libxl__blktap_devpath(gc, disk->pdev_path,
+ disk->format);
+ if (!dev) {
+ LOGD(ERROR, domid, "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;
+ case LIBXL_DISK_BACKEND_QDISK:
+ flexarray_append(back, "params");
+ flexarray_append(back, GCSPRINTF("%s:%s",
+
libxl__device_disk_string_of_format(disk->format), disk->pdev_path));
+ if (libxl_defbool_val(disk->colo_enable)) {
+ flexarray_append(back, "colo-host");
+ flexarray_append(back, libxl__sprintf(gc, "%s",
disk->colo_host));
+ flexarray_append(back, "colo-port");
+ flexarray_append(back, libxl__sprintf(gc, "%d",
disk->colo_port));
+ flexarray_append(back, "colo-export");
+ flexarray_append(back, libxl__sprintf(gc, "%s",
disk->colo_export));
+ flexarray_append(back, "active-disk");
+ flexarray_append(back, libxl__sprintf(gc, "%s",
disk->active_disk));
+ flexarray_append(back, "hidden-disk");
+ flexarray_append(back, libxl__sprintf(gc, "%s",
disk->hidden_disk));
+ }
+ assert(device->backend_kind == LIBXL__DEVICE_KIND_QDISK);
+ break;
+ default:
+ LOGD(ERROR, domid, "Unrecognized disk backend type: %d",
+ disk->backend);
+ rc = ERROR_INVAL;
+ goto out;
+ }
+
+ flexarray_append(back, "frontend-id");
+ flexarray_append(back, GCSPRINTF("%d", domid));
+ flexarray_append(back, "online");
+ flexarray_append(back, "1");
+ flexarray_append(back, "removable");
+ flexarray_append(back, GCSPRINTF("%d", (disk->removable) ? 1 : 0));
+ flexarray_append(back, "bootable");
+ flexarray_append(back, GCSPRINTF("%d", 1));
+ flexarray_append(back, "state");
+ flexarray_append(back, GCSPRINTF("%d", XenbusStateInitialising));
+ flexarray_append(back, "dev");
+ flexarray_append(back, disk->vdev);
+ flexarray_append(back, "type");
+ flexarray_append(back,
libxl__device_disk_string_of_backend(disk->backend));
+ flexarray_append(back, "mode");
+ flexarray_append(back, disk->readwrite ? "w" : "r");
+ flexarray_append(back, "device-type");
+ flexarray_append(back, disk->is_cdrom ? "cdrom" : "disk");
+ if (disk->direct_io_safe) {
+ flexarray_append(back, "direct-io-safe");
+ flexarray_append(back, "1");
+ }
+ flexarray_append_pair(back, "discard-enable",
+ libxl_defbool_val(disk->discard_enable) ?
+ "1" : "0");
+
+ flexarray_append(front, "backend-id");
+ flexarray_append(front, GCSPRINTF("%d", disk->backend_domid));
+ flexarray_append(front, "state");
+ flexarray_append(front, GCSPRINTF("%d", XenbusStateInitialising));
+ flexarray_append(front, "virtual-device");
+ flexarray_append(front, GCSPRINTF("%d", device->devid));
+ flexarray_append(front, "device-type");
+ flexarray_append(front, disk->is_cdrom ? "cdrom" : "disk");
+
+ /*
+ * Old PV kernel disk frontends before 2.6.26 rely on tool stack to
+ * write disk native protocol to frontend node. Xend does this, port
+ * this behaviour to xl.
+ *
+ * New kernels write this node themselves. In that case it just
+ * overwrites an existing node which is OK.
+ */
+ if (type == LIBXL_DOMAIN_TYPE_PV) {
+ const char *protocol =
+ xc_domain_get_native_protocol(ctx->xch, domid);
+ if (protocol) {
+ flexarray_append(front, "protocol");
+ flexarray_append(front, libxl__strdup(gc, protocol));
+ }
+ }
+
+ if (!get_vdev && aodev->update_json) {
+ rc = libxl__set_domain_configuration(gc, domid, &d_config);
+ if (rc) goto out;
+ }
+
+ libxl__device_generic_add(gc, t, device,
+ libxl__xs_kvs_of_flexarray(gc, back),
+ libxl__xs_kvs_of_flexarray(gc, front),
+ NULL);
+
+ rc = libxl__xs_transaction_commit(gc, &t);
+ if (!rc) break;
+ if (rc < 0) goto out;
+ }
+
+ aodev->dev = device;
+ aodev->action = LIBXL__DEVICE_ACTION_ADD;
+ libxl__wait_device_connection(egc, aodev);
+
+ rc = 0;
+
+out:
+ libxl__xs_transaction_abort(gc, &t);
+ if (lock) libxl__unlock_domain_userdata(lock);
+ libxl_device_disk_dispose(&disk_saved);
+ libxl_domain_config_dispose(&d_config);
+ aodev->rc = rc;
+ if (rc) aodev->callback(egc, aodev);
+ return;
+}
+
+static void libxl__device_disk_add(libxl__egc *egc, uint32_t domid,
+ libxl_device_disk *disk,
+ libxl__ao_device *aodev)
+{
+ device_disk_add(egc, domid, disk, aodev, NULL, NULL);
+}
+
+static int libxl__device_disk_from_xenstore(libxl__gc *gc,
+ const char *libxl_path,
+ libxl_device_disk *disk)
+{
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ unsigned int len;
+ char *tmp;
+ int rc;
+
+ libxl_device_disk_init(disk);
+
+ const char *backend_path;
+ rc = libxl__xs_read_checked(gc, XBT_NULL,
+ GCSPRINTF("%s/backend", libxl_path),
+ &backend_path);
+ if (rc) goto out;
+
+ if (!backend_path) {
+ LOG(ERROR, "disk %s does not exist (no backend path", libxl_path);
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ rc = libxl__backendpath_parse_domid(gc, backend_path,
&disk->backend_domid);
+ if (rc) {
+ LOG(ERROR, "Unable to fetch device backend domid from %s",
backend_path);
+ goto out;
+ }
+
+ /*
+ * "params" may not be present; but everything else must be.
+ * colo releated entries(colo-host, colo-port, colo-export,
+ * active-disk and hidden-disk) are present only if colo is
+ * enabled.
+ */
+ tmp = xs_read(ctx->xsh, XBT_NULL,
+ GCSPRINTF("%s/params", libxl_path), &len);
+ if (tmp && strchr(tmp, ':')) {
+ disk->pdev_path = strdup(strchr(tmp, ':') + 1);
+ free(tmp);
+ } else {
+ disk->pdev_path = tmp;
+ }
+
+ tmp = xs_read(ctx->xsh, XBT_NULL,
+ GCSPRINTF("%s/colo-host", libxl_path), &len);
+ if (tmp) {
+ libxl_defbool_set(&disk->colo_enable, true);
+ disk->colo_host = tmp;
+
+ tmp = xs_read(ctx->xsh, XBT_NULL,
+ GCSPRINTF("%s/colo-port", libxl_path), &len);
+ if (!tmp) {
+ LOG(ERROR, "Missing xenstore node %s/colo-port", libxl_path);
+ goto cleanup;
+ }
+ disk->colo_port = atoi(tmp);
+
+#define XS_READ_COLO(param, item) do { \
+ tmp = xs_read(ctx->xsh, XBT_NULL, \
+ GCSPRINTF("%s/"#param"", libxl_path), &len); \
+ if (!tmp) { \
+ LOG(ERROR, "Missing xenstore node %s/"#param"", libxl_path); \
+ goto cleanup; \
+ } \
+ disk->item = tmp; \
+} while (0)
+ XS_READ_COLO(colo-export, colo_export);
+ XS_READ_COLO(active-disk, active_disk);
+ XS_READ_COLO(hidden-disk, hidden_disk);
+#undef XS_READ_COLO
+ } else {
+ libxl_defbool_set(&disk->colo_enable, false);
+ }
+
+ tmp = libxl__xs_read(gc, XBT_NULL,
+ GCSPRINTF("%s/type", libxl_path));
+ if (!tmp) {
+ LOG(ERROR, "Missing xenstore node %s/type", libxl_path);
+ goto cleanup;
+ }
+ libxl_string_to_backend(ctx, tmp, &(disk->backend));
+
+ disk->vdev = xs_read(ctx->xsh, XBT_NULL,
+ GCSPRINTF("%s/dev", libxl_path), &len);
+ if (!disk->vdev) {
+ LOG(ERROR, "Missing xenstore node %s/dev", libxl_path);
+ goto cleanup;
+ }
+
+ tmp = libxl__xs_read(gc, XBT_NULL, libxl__sprintf
+ (gc, "%s/removable", libxl_path));
+ if (!tmp) {
+ LOG(ERROR, "Missing xenstore node %s/removable", libxl_path);
+ goto cleanup;
+ }
+ disk->removable = atoi(tmp);
+
+ tmp = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/mode", libxl_path));
+ if (!tmp) {
+ LOG(ERROR, "Missing xenstore node %s/mode", libxl_path);
+ goto cleanup;
+ }
+ if (!strcmp(tmp, "w"))
+ disk->readwrite = 1;
+ else
+ disk->readwrite = 0;
+
+ tmp = libxl__xs_read(gc, XBT_NULL,
+ GCSPRINTF("%s/device-type", libxl_path));
+ if (!tmp) {
+ LOG(ERROR, "Missing xenstore node %s/device-type", libxl_path);
+ goto cleanup;
+ }
+ disk->is_cdrom = !strcmp(tmp, "cdrom");
+
+ disk->format = LIBXL_DISK_FORMAT_UNKNOWN;
+
+ return 0;
+cleanup:
+ rc = ERROR_FAIL;
+ out:
+ libxl_device_disk_dispose(disk);
+ return rc;
+}
+
+int libxl_vdev_to_device_disk(libxl_ctx *ctx, uint32_t domid,
+ const char *vdev, libxl_device_disk *disk)
+{
+ GC_INIT(ctx);
+ char *dom_xl_path, *libxl_path;
+ int devid = libxl__device_disk_dev_number(vdev, NULL, NULL);
+ int rc = ERROR_FAIL;
+
+ if (devid < 0)
+ return ERROR_INVAL;
+
+ libxl_device_disk_init(disk);
+
+ dom_xl_path = libxl__xs_libxl_path(gc, domid);
+ if (!dom_xl_path) {
+ goto out;
+ }
+ libxl_path = GCSPRINTF("%s/device/vbd/%d", dom_xl_path, devid);
+
+ rc = libxl__device_disk_from_xenstore(gc, libxl_path, disk);
+out:
+ GC_FREE;
+ return rc;
+}
+
+static int libxl__append_disk_list(libxl__gc *gc,
+ uint32_t domid,
+ libxl_device_disk **disks,
+ int *ndisks)
+{
+ char *libxl_dir_path = NULL;
+ char **dir = NULL;
+ unsigned int n = 0;
+ libxl_device_disk *pdisk = NULL, *pdisk_end = NULL;
+ int rc=0;
+ int initial_disks = *ndisks;
+
+ libxl_dir_path = GCSPRINTF("%s/device/vbd",
+ libxl__xs_libxl_path(gc, domid));
+ dir = libxl__xs_directory(gc, XBT_NULL, libxl_dir_path, &n);
+ if (dir && n) {
+ libxl_device_disk *tmp;
+ tmp = realloc(*disks, sizeof (libxl_device_disk) * (*ndisks + n));
+ if (tmp == NULL)
+ return ERROR_NOMEM;
+ *disks = tmp;
+ pdisk = *disks + initial_disks;
+ pdisk_end = *disks + initial_disks + n;
+ for (; pdisk < pdisk_end; pdisk++, dir++) {
+ const char *p;
+ p = GCSPRINTF("%s/%s", libxl_dir_path, *dir);
+ if ((rc=libxl__device_disk_from_xenstore(gc, p, pdisk)))
+ goto out;
+ *ndisks += 1;
+ }
+ }
+out:
+ return rc;
+}
+
+libxl_device_disk *libxl_device_disk_list(libxl_ctx *ctx, uint32_t domid, int
*num)
+{
+ GC_INIT(ctx);
+ libxl_device_disk *disks = NULL;
+ int rc;
+
+ *num = 0;
+
+ rc = libxl__append_disk_list(gc, domid, &disks, num);
+ if (rc) goto out_err;
+
+ GC_FREE;
+ return disks;
+
+out_err:
+ LOG(ERROR, "Unable to list disks");
+ while (disks && *num) {
+ (*num)--;
+ libxl_device_disk_dispose(&disks[*num]);
+ }
+ free(disks);
+ return NULL;
+}
+
+int libxl_device_disk_getinfo(libxl_ctx *ctx, uint32_t domid,
+ libxl_device_disk *disk, libxl_diskinfo
*diskinfo)
+{
+ GC_INIT(ctx);
+ char *dompath, *fe_path, *libxl_path;
+ char *val;
+ int rc;
+
+ diskinfo->backend = NULL;
+
+ dompath = libxl__xs_get_dompath(gc, domid);
+ diskinfo->devid = libxl__device_disk_dev_number(disk->vdev, NULL, NULL);
+
+ /* tap devices entries in xenstore are written as vbd devices. */
+ fe_path = GCSPRINTF("%s/device/vbd/%d", dompath, diskinfo->devid);
+ libxl_path = GCSPRINTF("%s/device/vbd/%d",
+ libxl__xs_libxl_path(gc, domid), diskinfo->devid);
+ diskinfo->backend = xs_read(ctx->xsh, XBT_NULL,
+ GCSPRINTF("%s/backend", libxl_path), NULL);
+ if (!diskinfo->backend) {
+ GC_FREE;
+ return ERROR_FAIL;
+ }
+ rc = libxl__backendpath_parse_domid(gc, diskinfo->backend,
+ &diskinfo->backend_id);
+ if (rc) goto out;
+
+ val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/state", fe_path));
+ diskinfo->state = val ? strtoul(val, NULL, 10) : -1;
+ val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/event-channel", fe_path));
+ diskinfo->evtch = val ? strtoul(val, NULL, 10) : -1;
+ val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/ring-ref", fe_path));
+ diskinfo->rref = val ? strtoul(val, NULL, 10) : -1;
+ diskinfo->frontend = xs_read(ctx->xsh, XBT_NULL,
+ GCSPRINTF("%s/frontend", libxl_path), NULL);
+ diskinfo->frontend_id = domid;
+
+ GC_FREE;
+ return 0;
+
+ out:
+ free(diskinfo->backend);
+ return rc;
+}
+
+int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
+ const libxl_asyncop_how *ao_how)
+{
+ AO_CREATE(ctx, domid, ao_how);
+ int num = 0, i;
+ libxl_device_disk *disks = NULL, disk_saved, disk_empty;
+ libxl_domain_config d_config;
+ int rc, dm_ver;
+ libxl__device device;
+ const char *be_path, *libxl_path;
+ char * tmp;
+ libxl__domain_userdata_lock *lock = NULL;
+ xs_transaction_t t = XBT_NULL;
+ flexarray_t *insert = NULL, *empty = NULL;
+
+ libxl_domain_config_init(&d_config);
+ libxl_device_disk_init(&disk_empty);
+ libxl_device_disk_init(&disk_saved);
+ libxl_device_disk_copy(ctx, &disk_saved, disk);
+
+ disk_empty.format = LIBXL_DISK_FORMAT_EMPTY;
+ disk_empty.vdev = libxl__strdup(NOGC, disk->vdev);
+ disk_empty.pdev_path = libxl__strdup(NOGC, "");
+ disk_empty.is_cdrom = 1;
+ libxl__device_disk_setdefault(gc, &disk_empty, domid);
+
+ libxl_domain_type type = libxl__domain_type(gc, domid);
+ if (type == LIBXL_DOMAIN_TYPE_INVALID) {
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ if (type != LIBXL_DOMAIN_TYPE_HVM) {
+ LOGD(ERROR, domid, "cdrom-insert requires an HVM domain");
+ rc = ERROR_INVAL;
+ goto out;
+ }
+
+ if (libxl_get_stubdom_id(ctx, domid) != 0) {
+ LOGD(ERROR, domid, "cdrom-insert doesn't work for stub domains");
+ rc = ERROR_INVAL;
+ goto out;
+ }
+
+ dm_ver = libxl__device_model_version_running(gc, domid);
+ if (dm_ver == -1) {
+ LOGD(ERROR, domid, "Cannot determine device model version");
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_NONE) {
+ LOGD(ERROR, domid, "Guests without a device model cannot use
cd-insert");
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ disks = libxl_device_disk_list(ctx, domid, &num);
+ for (i = 0; i < num; i++) {
+ if (disks[i].is_cdrom && !strcmp(disk->vdev, disks[i].vdev))
+ {
+ /* Found. Set backend type appropriately. */
+ disk->backend=disks[i].backend;
+ break;
+ }
+ }
+ if (i == num) {
+ LOGD(ERROR, domid, "Virtual device not found");
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ rc = libxl__device_disk_setdefault(gc, disk, domid);
+ if (rc) goto out;
+
+ if (!disk->pdev_path) {
+ disk->pdev_path = libxl__strdup(NOGC, "");
+ disk->format = LIBXL_DISK_FORMAT_EMPTY;
+ }
+
+ rc = libxl__device_from_disk(gc, domid, disk, &device);
+ if (rc) goto out;
+
+ be_path = libxl__device_backend_path(gc, &device);
+ libxl_path = libxl__device_libxl_path(gc, &device);
+
+ insert = flexarray_make(gc, 4, 1);
+
+ flexarray_append_pair(insert, "type",
+ libxl__device_disk_string_of_backend(disk->backend));
+ if (disk->format != LIBXL_DISK_FORMAT_EMPTY)
+ flexarray_append_pair(insert, "params",
+ GCSPRINTF("%s:%s",
+ libxl__device_disk_string_of_format(disk->format),
+ disk->pdev_path));
+ else
+ flexarray_append_pair(insert, "params", "");
+
+ empty = flexarray_make(gc, 4, 1);
+ flexarray_append_pair(empty, "type",
+ libxl__device_disk_string_of_backend(disk->backend));
+ flexarray_append_pair(empty, "params", "");
+
+ /* Note: CTX lock is already held at this point so lock hierarchy
+ * is maintained.
+ */
+ lock = libxl__lock_domain_userdata(gc, domid);
+ if (!lock) {
+ rc = ERROR_LOCK_FAIL;
+ goto out;
+ }
+
+ /* We need to eject the original image first. This is implemented
+ * by inserting empty media. JSON is not updated.
+ */
+ if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
+ rc = libxl__qmp_insert_cdrom(gc, domid, &disk_empty);
+ if (rc) goto out;
+ }
+
+ for (;;) {
+ rc = libxl__xs_transaction_start(gc, &t);
+ if (rc) goto out;
+ /* Sanity check: make sure the device exists before writing here */
+ tmp = libxl__xs_read(gc, t, GCSPRINTF("%s/frontend", libxl_path));
+ if (!tmp)
+ {
+ LOGD(ERROR, domid, "Internal error: %s does not exist",
+ GCSPRINTF("%s/frontend", libxl_path));
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ char **kvs = libxl__xs_kvs_of_flexarray(gc, empty);
+
+ rc = libxl__xs_writev(gc, t, be_path, kvs);
+ if (rc) goto out;
+
+ rc = libxl__xs_writev(gc, t, libxl_path, kvs);
+ if (rc) goto out;
+
+ rc = libxl__xs_transaction_commit(gc, &t);
+ if (!rc) break;
+ if (rc < 0) goto out;
+ }
+
+ rc = libxl__get_domain_configuration(gc, domid, &d_config);
+ if (rc) goto out;
+
+ DEVICE_ADD(disk, disks, domid, &disk_saved, COMPARE_DISK, &d_config);
+
+ rc = libxl__dm_check_start(gc, &d_config, domid);
+ if (rc) goto out;
+
+ if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
+ rc = libxl__qmp_insert_cdrom(gc, domid, disk);
+ if (rc) goto out;
+ }
+
+ for (;;) {
+ rc = libxl__xs_transaction_start(gc, &t);
+ if (rc) goto out;
+ /* Sanity check: make sure the device exists before writing here */
+ tmp = libxl__xs_read(gc, t, GCSPRINTF("%s/frontend", libxl_path));
+ if (!tmp)
+ {
+ LOGD(ERROR, domid, "Internal error: %s does not exist",
+ GCSPRINTF("%s/frontend", libxl_path));
+ rc = ERROR_FAIL;
+ goto out;
+ }
+
+ rc = libxl__set_domain_configuration(gc, domid, &d_config);
+ if (rc) goto out;
+
+ char **kvs = libxl__xs_kvs_of_flexarray(gc, insert);
+
+ rc = libxl__xs_writev(gc, t, be_path, kvs);
+ if (rc) goto out;
+
+ rc = libxl__xs_writev(gc, t, libxl_path, kvs);
+ if (rc) goto out;
+
+ rc = libxl__xs_transaction_commit(gc, &t);
+ if (!rc) break;
+ if (rc < 0) goto out;
+ }
+
+ /* success, no actual async */
+ libxl__ao_complete(egc, ao, 0);
+
+ rc = 0;
+
+out:
+ libxl__xs_transaction_abort(gc, &t);
+ for (i = 0; i < num; i++)
+ libxl_device_disk_dispose(&disks[i]);
+ free(disks);
+ libxl_device_disk_dispose(&disk_empty);
+ libxl_device_disk_dispose(&disk_saved);
+ libxl_domain_config_dispose(&d_config);
+
+ if (lock) libxl__unlock_domain_userdata(lock);
+
+ if (rc) return AO_CREATE_FAIL(rc);
+ return AO_INPROGRESS;
+}
+
+/* libxl__alloc_vdev only works on the local domain, that is the domain
+ * where the toolstack is running */
+static char * libxl__alloc_vdev(libxl__gc *gc, void *get_vdev_user,
+ xs_transaction_t t)
+{
+ const char *blkdev_start = (const char *) get_vdev_user;
+ int devid = 0, disk = 0, part = 0;
+ char *libxl_dom_path = libxl__xs_libxl_path(gc, LIBXL_TOOLSTACK_DOMID);
+
+ libxl__device_disk_dev_number(blkdev_start, &disk, &part);
+ if (part != 0) {
+ LOG(ERROR, "blkdev_start is invalid");
+ return NULL;
+ }
+
+ do {
+ devid = libxl__device_disk_dev_number(GCSPRINTF("d%dp0", disk),
+ NULL, NULL);
+ if (devid < 0)
+ return NULL;
+ if (libxl__xs_read(gc, t,
+ GCSPRINTF("%s/device/vbd/%d/backend",
+ libxl_dom_path, devid)) == NULL) {
+ if (errno == ENOENT)
+ return libxl__devid_to_vdev(gc, devid);
+ else
+ return NULL;
+ }
+ disk++;
+ } while (1);
+ return NULL;
+}
+
+/* Callbacks */
+
+char *libxl__device_disk_find_local_path(libxl__gc *gc,
+ libxl_domid guest_domid,
+ const libxl_device_disk *disk,
+ bool qdisk_direct)
+{
+ char *path = NULL;
+
+ /* No local paths for driver domains */
+ if (disk->backend_domname != NULL) {
+ LOG(DEBUG, "Non-local backend, can't access locally.\n");
+ goto out;
+ }
+
+ /*
+ * If this is in raw format, and we're not using a script or a
+ * driver domain, we can access the target path directly.
+ */
+ if (disk->format == LIBXL_DISK_FORMAT_RAW
+ && disk->script == NULL) {
+ path = libxl__strdup(gc, disk->pdev_path);
+ LOG(DEBUG, "Directly accessing local RAW disk %s", path);
+ goto out;
+ }
+
+ /*
+ * If we're being called for a qemu path, we can pass the target
+ * string directly as well
+ */
+ if (qdisk_direct && disk->backend == LIBXL_DISK_BACKEND_QDISK) {
+ path = libxl__strdup(gc, disk->pdev_path);
+ LOG(DEBUG, "Directly accessing local QDISK target %s", path);
+ goto out;
+ }
+
+ /*
+ * If the format isn't raw and / or we're using a script, then see
+ * if the script has written a path to the "cooked" node
+ */
+ if (disk->script && guest_domid != INVALID_DOMID) {
+ libxl__device device;
+ char *be_path, *pdpath;
+ int rc;
+
+ LOGD(DEBUG, guest_domid,
+ "Run from a script; checking for physical-device-path (vdev %s)",
+ disk->vdev);
+
+ rc = libxl__device_from_disk(gc, guest_domid, disk, &device);
+ if (rc < 0)
+ goto out;
+
+ be_path = libxl__device_backend_path(gc, &device);
+
+ pdpath = libxl__sprintf(gc, "%s/physical-device-path", be_path);
+
+ LOGD(DEBUG, guest_domid, "Attempting to read node %s", pdpath);
+ path = libxl__xs_read(gc, XBT_NULL, pdpath);
+
+ if (path)
+ LOGD(DEBUG, guest_domid, "Accessing cooked block device %s", path);
+ else
+ LOGD(DEBUG, guest_domid, "No physical-device-path, can't access
locally.");
+
+ goto out;
+ }
+
+ out:
+ return path;
+}
+
+static void local_device_attach_cb(libxl__egc *egc, libxl__ao_device *aodev);
+
+void libxl__device_disk_local_initiate_attach(libxl__egc *egc,
+ libxl__disk_local_state *dls)
+{
+ STATE_AO_GC(dls->ao);
+ int rc;
+ const libxl_device_disk *in_disk = dls->in_disk;
+ libxl_device_disk *disk = &dls->disk;
+ const char *blkdev_start = dls->blkdev_start;
+
+ assert(in_disk->pdev_path);
+
+ disk->vdev = NULL;
+
+ if (dls->diskpath)
+ LOG(DEBUG, "Strange, dls->diskpath already set: %s", dls->diskpath);
+
+ LOG(DEBUG, "Trying to find local path");
+
+ dls->diskpath = libxl__device_disk_find_local_path(gc, INVALID_DOMID,
+ in_disk, false);
+ if (dls->diskpath) {
+ LOG(DEBUG, "Local path found, executing callback.");
+ dls->callback(egc, dls, 0);
+ } else {
+ LOG(DEBUG, "Local path not found, initiating attach.");
+
+ memcpy(disk, in_disk, sizeof(libxl_device_disk));
+ disk->pdev_path = libxl__strdup(gc, in_disk->pdev_path);
+ if (in_disk->script != NULL)
+ disk->script = libxl__strdup(gc, in_disk->script);
+ disk->vdev = NULL;
+
+ rc = libxl__device_disk_setdefault(gc, disk, LIBXL_TOOLSTACK_DOMID);
+ if (rc) goto out;
+
+ libxl__prepare_ao_device(ao, &dls->aodev);
+ dls->aodev.callback = local_device_attach_cb;
+ device_disk_add(egc, LIBXL_TOOLSTACK_DOMID, disk, &dls->aodev,
+ libxl__alloc_vdev, (void *) blkdev_start);
+ }
+
+ return;
+
+ out:
+ assert(rc);
+ dls->rc = rc;
+ libxl__device_disk_local_initiate_detach(egc, dls);
+ dls->callback(egc, dls, rc);
+}
+
+static void local_device_attach_cb(libxl__egc *egc, libxl__ao_device *aodev)
+{
+ STATE_AO_GC(aodev->ao);
+ libxl__disk_local_state *dls = CONTAINER_OF(aodev, *dls, aodev);
+ char *be_path = NULL;
+ int rc;
+ libxl__device device;
+ libxl_device_disk *disk = &dls->disk;
+
+ rc = aodev->rc;
+ if (rc) {
+ LOGE(ERROR, "unable locally attach device: %s", disk->pdev_path);
+ goto out;
+ }
+
+ rc = libxl__device_from_disk(gc, LIBXL_TOOLSTACK_DOMID, disk, &device);
+ if (rc < 0)
+ goto out;
+ be_path = libxl__device_backend_path(gc, &device);
+ rc = libxl__wait_for_backend(gc, be_path, GCSPRINTF("%d",
XenbusStateConnected));
+ if (rc < 0)
+ goto out;
+
+ dls->diskpath = GCSPRINTF("/dev/%s",
+ libxl__devid_to_localdev(gc, device.devid));
+ LOG(DEBUG, "locally attached disk %s", dls->diskpath);
+
+ dls->callback(egc, dls, 0);
+ return;
+
+ out:
+ assert(rc);
+ dls->rc = rc;
+ libxl__device_disk_local_initiate_detach(egc, dls);
+ return;
+}
+
+/* Callbacks for local detach */
+
+static void local_device_detach_cb(libxl__egc *egc, libxl__ao_device *aodev);
+
+void libxl__device_disk_local_initiate_detach(libxl__egc *egc,
+ libxl__disk_local_state *dls)
+{
+ STATE_AO_GC(dls->ao);
+ int rc = 0;
+ libxl_device_disk *disk = &dls->disk;
+ libxl__device *device;
+ libxl__ao_device *aodev = &dls->aodev;
+ libxl__prepare_ao_device(ao, aodev);
+
+ if (!dls->diskpath) goto out;
+
+ if (disk->vdev != NULL) {
+ GCNEW(device);
+ rc = libxl__device_from_disk(gc, LIBXL_TOOLSTACK_DOMID,
+ disk, device);
+ if (rc != 0) goto out;
+
+ aodev->action = LIBXL__DEVICE_ACTION_REMOVE;
+ aodev->dev = device;
+ aodev->callback = local_device_detach_cb;
+ aodev->force = 0;
+ libxl__initiate_device_generic_remove(egc, aodev);
+ return;
+ }
+
+out:
+ aodev->rc = rc;
+ local_device_detach_cb(egc, aodev);
+ return;
+}
+
+static void local_device_detach_cb(libxl__egc *egc, libxl__ao_device *aodev)
+{
+ STATE_AO_GC(aodev->ao);
+ libxl__disk_local_state *dls = CONTAINER_OF(aodev, *dls, aodev);
+ int rc;
+
+ if (aodev->rc) {
+ LOGED(ERROR, aodev->dev->domid, "Unable to %s %s with id %u",
+ libxl__device_action_to_string(aodev->action),
+ libxl__device_kind_to_string(aodev->dev->kind),
+ aodev->dev->devid);
+ goto out;
+ }
+
+out:
+ /*
+ * If there was an error in dls->rc, it means we have been called from
+ * a failed execution of libxl__device_disk_local_initiate_attach,
+ * so return the original error.
+ */
+ rc = dls->rc ? dls->rc : aodev->rc;
+ dls->callback(egc, dls, rc);
+ return;
+}
+
+/* The following functions are defined:
+ * libxl_device_disk_add
+ * libxl__add_disks
+ * libxl_device_disk_remove
+ * libxl_device_disk_destroy
+ */
+LIBXL_DEFINE_DEVICE_ADD(disk)
+LIBXL_DEFINE_DEVICES_ADD(disk)
+LIBXL_DEFINE_DEVICE_REMOVE(disk)
+
+static int libxl_device_disk_compare(libxl_device_disk *d1,
+ libxl_device_disk *d2)
+{
+ return COMPARE_DISK(d1, d2);
+}
+
+/* Take care of removable device. We maintain invariant in the
+ * insert / remove operation so that:
+ * 1. if xenstore is "empty" while JSON is not, the result
+ * is "empty"
+ * 2. if xenstore has a different media than JSON, use the
+ * one in JSON
+ * 3. if xenstore and JSON have the same media, well, you
+ * know the answer :-)
+ *
+ * Currently there is only one removable device -- CDROM.
+ * Look for libxl_cdrom_insert for reference.
+ */
+static void libxl_device_disk_merge(libxl_ctx *ctx, void *d1, void *d2)
+{
+ GC_INIT(ctx);
+ libxl_device_disk *src = d1;
+ libxl_device_disk *dst = d2;
+
+ if (src->removable) {
+ if (!src->pdev_path || *src->pdev_path == '\0') {
+ /* 1, no media in drive */
+ free(dst->pdev_path);
+ dst->pdev_path = libxl__strdup(NOGC, "");
+ dst->format = LIBXL_DISK_FORMAT_EMPTY;
+ } else {
+ /* 2 and 3, use JSON, no need to touch anything */
+ ;
+ }
+ }
+}
+
+static int libxl_device_disk_dm_needed(void *e, unsigned domid)
+{
+ libxl_device_disk *elem = e;
+
+ return elem->backend == LIBXL_DISK_BACKEND_QDISK &&
+ elem->backend_domid == domid;
+}
+
+DEFINE_DEVICE_TYPE_STRUCT(disk,
+ .merge = libxl_device_disk_merge,
+ .dm_needed = libxl_device_disk_dm_needed,
+ .skip_attach = 1
+);
+
+/*
+ * Local variables:
+ * mode: C
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.10.2
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