# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1280246842 -3600
# Node ID cb3b15c1a8e6fa56f3da0b33819341e00b3e2858
# Parent bc93d6455f5f9771c7e3dac15e5b1d8d241a4f86
libxl: add libxl_domain_preserve
This method is intended to preserve an existing (but shut down) domain
(for debugging purposes) in such a way that the domain can also be
restarted.
There is likely to be more required to achieve this aim than the
function currently does.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
tools/libxl/libxl.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/libxl/libxl.h | 1
2 files changed, 56 insertions(+)
diff -r bc93d6455f5f -r cb3b15c1a8e6 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c Tue Jul 27 17:06:14 2010 +0100
+++ b/tools/libxl/libxl.c Tue Jul 27 17:07:22 2010 +0100
@@ -399,6 +399,61 @@ int libxl_domain_resume(struct libxl_ctx
domid);
return ERROR_FAIL;
}
+ return 0;
+}
+
+/*
+ * Preserves a domain but rewrites xenstore etc to make it unique so
+ * that the domain can be restarted.
+ *
+ * Does not modify info so that it may be reused.
+ */
+int libxl_domain_preserve(struct libxl_ctx *ctx, uint32_t domid,
+ libxl_domain_create_info *info, const char
*name_suffix, uint8_t new_uuid[16])
+{
+ struct xs_permissions roperm[2];
+ xs_transaction_t t;
+ char *preserved_name;
+ char *uuid_string;
+ char *vm_path;
+ char *dom_path;
+
+ int rc;
+
+ preserved_name = libxl_sprintf(ctx, "%s%s", info->name, name_suffix);
+ if (!preserved_name) return ERROR_NOMEM;
+
+ uuid_string = libxl_uuid2string(ctx, new_uuid);
+ if (!uuid_string) return ERROR_NOMEM;
+
+ dom_path = libxl_xs_get_dompath(ctx, domid);
+ if (!dom_path) return ERROR_FAIL;
+
+ vm_path = libxl_sprintf(ctx, "/vm/%s", uuid_string);
+ if (!vm_path) return ERROR_FAIL;
+
+ roperm[0].id = 0;
+ roperm[0].perms = XS_PERM_NONE;
+ roperm[1].id = domid;
+ roperm[1].perms = XS_PERM_READ;
+
+ retry_transaction:
+ t = xs_transaction_start(ctx->xsh);
+
+ xs_rm(ctx->xsh, t, vm_path);
+ xs_mkdir(ctx->xsh, t, vm_path);
+ xs_set_permissions(ctx->xsh, t, vm_path, roperm, ARRAY_SIZE(roperm));
+
+ xs_write(ctx->xsh, t, libxl_sprintf(ctx, "%s/vm", dom_path), vm_path,
strlen(vm_path));
+ rc = libxl_domain_rename(ctx, domid, info->name, preserved_name, t);
+ if (rc) return rc;
+
+ xs_write(ctx->xsh, t, libxl_sprintf(ctx, "%s/uuid", vm_path), uuid_string,
strlen(uuid_string));
+
+ if (!xs_transaction_end(ctx->xsh, t, 0))
+ if (errno == EAGAIN)
+ goto retry_transaction;
+
return 0;
}
diff -r bc93d6455f5f -r cb3b15c1a8e6 tools/libxl/libxl.h
--- a/tools/libxl/libxl.h Tue Jul 27 17:06:14 2010 +0100
+++ b/tools/libxl/libxl.h Tue Jul 27 17:07:22 2010 +0100
@@ -338,6 +338,7 @@ int libxl_domain_resume(struct libxl_ctx
int libxl_domain_resume(struct libxl_ctx *ctx, uint32_t domid);
int libxl_domain_shutdown(struct libxl_ctx *ctx, uint32_t domid, int req);
int libxl_domain_destroy(struct libxl_ctx *ctx, uint32_t domid, int force);
+int libxl_domain_preserve(struct libxl_ctx *ctx, uint32_t domid,
libxl_domain_create_info *info, const char *name_suffix, uint8_t new_uuid[16]);
int libxl_file_reference_map(struct libxl_ctx *ctx, libxl_file_reference *f);
int libxl_file_reference_unmap(struct libxl_ctx *ctx, libxl_file_reference *f);
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