Support renaming of cpupools

Add a new library function libxl_cpupool_rename() and a new xl command
xl cpupool-rename to support renaming of cpupools.

Signed-off-by: juergen.gross@ts.fujitsu.com
Signed-off-by: Ian Jackson <ian.jackson.citrix.com>

6 files changed, 93 insertions, 2 deletions

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 6436ada8f2..68889b9aa2 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3885,6 +3885,49 @@ out:
     return rc;
 }
 
+int libxl_cpupool_rename(libxl_ctx *ctx, const char *name, uint32_t poolid)
+{
+    libxl__gc gc = LIBXL_INIT_GC(ctx);
+    xs_transaction_t t;
+    xc_cpupoolinfo_t *info;
+    int rc;
+
+    info = xc_cpupool_getinfo(ctx->xch, poolid);
+    if (info == NULL) {
+        libxl__free_all(&gc);
+        return ERROR_NOMEM;
+    }
+
+    rc = ERROR_INVAL;
+    if (info->cpupool_id != poolid)
+        goto out;
+
+    rc = 0;
+
+    for (;;) {
+        t = xs_transaction_start(ctx->xsh);
+
+        libxl__xs_write(&gc, t,
+                        libxl__sprintf(&gc, "/local/pool/%d/name", poolid),
+                        "%s", name);
+
+        if (xs_transaction_end(ctx->xsh, t, 0))
+            break;
+
+        if (errno == EAGAIN)
+            continue;
+
+        rc = ERROR_FAIL;
+        break;
+    }
+
+out:
+    xc_cpupool_infofree(ctx->xch, info);
+    libxl__free_all(&gc);
+
+    return rc;
+}
+
 int libxl_cpupool_cpuadd(libxl_ctx *ctx, uint32_t poolid, int cpu)
 {
     int rc;
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index e763665c8a..6e141a779e 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -528,6 +528,7 @@ int libxl_create_cpupool(libxl_ctx *ctx, const char *name, int schedid,
                          libxl_cpumap cpumap, libxl_uuid *uuid,
                          uint32_t *poolid);
 int libxl_destroy_cpupool(libxl_ctx *ctx, uint32_t poolid);
+int libxl_cpupool_rename(libxl_ctx *ctx, const char *name, uint32_t poolid);
 int libxl_cpupool_cpuadd(libxl_ctx *ctx, uint32_t poolid, int cpu);
 int libxl_cpupool_cpuadd_node(libxl_ctx *ctx, uint32_t poolid, int node, int *cpus);
 int libxl_cpupool_cpuremove(libxl_ctx *ctx, uint32_t poolid, int cpu);
diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c
index 40c73d4610..413768d758 100644
--- a/tools/libxl/libxl_utils.c
+++ b/tools/libxl/libxl_utils.c
@@ -107,10 +107,10 @@ char *libxl_cpupoolid_to_name(libxl_ctx *ctx, uint32_t poolid)
     char path[strlen("/local/pool") + 12];
     char *s;
 
-    if (poolid == 0)
-        return strdup("Pool-0");
     snprintf(path, sizeof(path), "/local/pool/%d/name", poolid);
     s = xs_read(ctx->xsh, XBT_NULL, path, &len);
+    if (!s && (poolid == 0))
+        return strdup("Pool-0");
     return s;
 }
 
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index 69eb9dfc88..64133e4187 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -82,6 +82,7 @@ int main_network2detach(int argc, char **argv);
 int main_cpupoolcreate(int argc, char **argv);
 int main_cpupoollist(int argc, char **argv);
 int main_cpupooldestroy(int argc, char **argv);
+int main_cpupoolrename(int argc, char **argv);
 int main_cpupoolcpuadd(int argc, char **argv);
 int main_cpupoolcpuremove(int argc, char **argv);
 int main_cpupoolmigrate(int argc, char **argv);
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 9c14d60438..cc5de43773 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5729,6 +5729,47 @@ int main_cpupooldestroy(int argc, char **argv)
     return -libxl_destroy_cpupool(&ctx, poolid);
 }
 
+int main_cpupoolrename(int argc, char **argv)
+{
+    int opt;
+    const char *pool;
+    const char *new_name;
+    uint32_t poolid;
+
+    while ((opt = getopt(argc, argv, "h")) != -1) {
+        switch (opt) {
+        case 'h':
+            help("cpupool-rename");
+            return 0;
+        default:
+            fprintf(stderr, "option `%c' not supported.\n", opt);
+            break;
+        }
+    }
+
+    pool = argv[optind++];
+    if (!pool || !argv[optind]) {
+        fprintf(stderr, "'xl cpupool-rename' requires 2 arguments.\n\n");
+        help("cpupool-rename");
+        return 1;
+    }
+
+    if (cpupool_qualifier_to_cpupoolid(pool, &poolid, NULL) ||
+        !libxl_cpupoolid_to_name(&ctx, poolid)) {
+        fprintf(stderr, "unknown cpupool \'%s\'\n", pool);
+        return -ERROR_FAIL;
+    }
+
+    new_name = argv[optind];
+
+    if (libxl_cpupool_rename(&ctx, new_name, poolid)) {
+        fprintf(stderr, "Can't rename cpupool '%s'.\n", pool);
+        return 1;
+    }
+
+    return 0;
+}
+
 int main_cpupoolcpuadd(int argc, char **argv)
 {
     int opt;
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
index 0da6077bec..854f7da96a 100644
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -358,6 +358,11 @@ struct cmd_spec cmd_table[] = {
       "Deactivates a CPU pool",
       "<CPU Pool>",
     },
+    { "cpupool-rename",
+      &main_cpupoolrename,
+      "Renames a CPU pool",
+      "<CPU Pool> <new name>",
+    },
     { "cpupool-cpu-add",
       &main_cpupoolcpuadd,
       "Adds a CPU to a CPU pool",