[PATCH v4 31/32] libxl_disk: Cut libxl_cdrom_insert into step

[Anthony PERARD <anthony.perard@citrix.com>]

This is to prepare libxl_cdrom_insert to be able to send commands to
QEMU via the libxl__ev_qmp. The next patch is going to make use of it.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 tools/libxl/libxl_disk.c | 194 +++++++++++++++++++++++++++------------
 1 file changed, 137 insertions(+), 57 deletions(-)

diff --git a/tools/libxl/libxl_disk.c b/tools/libxl/libxl_disk.c
index e9eceb65e3..c759179628 100644
--- a/tools/libxl/libxl_disk.c
+++ b/tools/libxl/libxl_disk.c
@@ -661,31 +661,55 @@ int libxl_device_disk_getinfo(libxl_ctx *ctx, uint32_t domid,
     return rc;
 }
 
+typedef struct {
+    libxl__ao *ao;
+    libxl_domain_config d_config;
+    const char *be_path;
+    const char *libxl_path;
+    libxl_device_disk *disk;
+    libxl_device_disk disk_empty;
+    libxl_device_disk disk_saved;
+    int dm_ver;
+    int domid;
+    libxl__domain_userdata_lock *lock;
+} libxl__cdrom_insert_state;
+static void cdrom_insert_ejected(libxl__egc *egc,
+                                 libxl__cdrom_insert_state *cis);
+static void cdrom_insert_inserted(libxl__egc *egc,
+                                  libxl__cdrom_insert_state *cis);
+static void cdrom_insert_done(libxl__egc *egc,
+                              libxl__cdrom_insert_state *cis,
+                              int 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_disk *disks = NULL, *disk_saved, *disk_empty;
+    int rc;
     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__cdrom_insert_state *cis;
 
-    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);
+    GCNEW(cis);
+    cis->ao = ao;
+    cis->domid = domid;
+    cis->disk = 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, domid, &disk_empty, false);
+    disk_empty = &cis->disk_empty;
+    disk_saved = &cis->disk_saved;
+
+
+    libxl_domain_config_init(&cis->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, domid, disk_empty, false);
 
     libxl_domain_type type = libxl__domain_type(gc, domid);
     if (type == LIBXL_DOMAIN_TYPE_INVALID) {
@@ -704,8 +728,8 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
         goto out;
     }
 
-    dm_ver = libxl__device_model_version_running(gc, domid);
-    if (dm_ver == -1) {
+    cis->dm_ver = libxl__device_model_version_running(gc, domid);
+    if (cis->dm_ver == -1) {
         LOGD(ERROR, domid, "Cannot determine device model version");
         rc = ERROR_FAIL;
         goto out;
@@ -737,31 +761,14 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
     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", "");
+    cis->be_path = libxl__device_backend_path(gc, &device);
+    cis->libxl_path = libxl__device_libxl_path(gc, &device);
 
     /* Note: CTX lock is already held at this point so lock hierarchy
      * is maintained.
      */
-    lock = libxl__lock_domain_userdata(gc, domid);
-    if (!lock) {
+    cis->lock = libxl__lock_domain_userdata(gc, domid);
+    if (!cis->lock) {
         rc = ERROR_LOCK_FAIL;
         goto out;
     }
@@ -769,11 +776,46 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
     /* 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 (cis->dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
+        rc = libxl__qmp_insert_cdrom(gc, domid, disk_empty);
         if (rc) goto out;
     }
 
+    cdrom_insert_ejected(egc, cis);
+
+    return AO_INPROGRESS;
+
+out:
+    libxl__device_list_free(&libxl__disk_devtype, disks, num);
+    cdrom_insert_done(egc, cis, rc);
+
+    if (rc) return AO_CREATE_FAIL(rc);
+    return AO_INPROGRESS;
+}
+
+static void cdrom_insert_ejected(libxl__egc *egc,
+                                 libxl__cdrom_insert_state *cis)
+{
+    STATE_AO_GC(cis->ao);
+    uint32_t domid = cis->domid;
+    int rc;
+    const char *be_path, *libxl_path;
+    char * tmp;
+    xs_transaction_t t = XBT_NULL;
+    flexarray_t *empty;
+
+    libxl_domain_config *d_config = &cis->d_config;
+    libxl_device_disk *disk = cis->disk;
+    libxl_device_disk *disk_saved = &cis->disk_saved;
+
+    be_path = cis->be_path;
+    libxl_path = cis->libxl_path;
+
+    empty = flexarray_make(gc, 4, 1);
+    flexarray_append_pair(empty, "type",
+                          libxl__device_disk_string_of_backend(disk->backend));
+    flexarray_append_pair(empty, "params", "");
+
     for (;;) {
         rc = libxl__xs_transaction_start(gc, &t);
         if (rc) goto out;
@@ -800,19 +842,55 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
         if (rc < 0) goto out;
     }
 
-    rc = libxl__get_domain_configuration(gc, domid, &d_config);
+    rc = libxl__get_domain_configuration(gc, domid, d_config);
     if (rc) goto out;
 
-    device_add_domain_config(gc, &d_config, &libxl__disk_devtype, &disk_saved);
+    device_add_domain_config(gc, d_config, &libxl__disk_devtype, disk_saved);
 
-    rc = libxl__dm_check_start(gc, &d_config, domid);
+    rc = libxl__dm_check_start(gc, d_config, domid);
     if (rc) goto out;
 
-    if (dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
+    if (cis->dm_ver == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
         rc = libxl__qmp_insert_cdrom(gc, domid, disk);
         if (rc) goto out;
     }
 
+    cdrom_insert_inserted(egc, cis);
+
+    return;
+
+out:
+    libxl__xs_transaction_abort(gc, &t);
+    cdrom_insert_done(egc, cis, rc);
+}
+
+static void cdrom_insert_inserted(libxl__egc *egc,
+                                  libxl__cdrom_insert_state *cis)
+{
+    STATE_AO_GC(cis->ao);
+    uint32_t domid = cis->domid;
+    int rc;
+    const char *be_path, *libxl_path;
+    char * tmp;
+    xs_transaction_t t = XBT_NULL;
+    flexarray_t *insert;
+
+    libxl_device_disk *disk = cis->disk;
+    libxl_domain_config *d_config = &cis->d_config;
+    be_path = cis->be_path;
+    libxl_path = cis->libxl_path;
+
+    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", "");
+
     for (;;) {
         rc = libxl__xs_transaction_start(gc, &t);
         if (rc) goto out;
@@ -826,7 +904,7 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
             goto out;
         }
 
-        rc = libxl__set_domain_configuration(gc, domid, &d_config);
+        rc = libxl__set_domain_configuration(gc, domid, d_config);
         if (rc) goto out;
 
         char **kvs = libxl__xs_kvs_of_flexarray(gc, insert);
@@ -842,22 +920,24 @@ int libxl_cdrom_insert(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *disk,
         if (rc < 0) goto out;
     }
 
-    /* success, no actual async */
-    libxl__ao_complete(egc, ao, 0);
-
     rc = 0;
 
 out:
     libxl__xs_transaction_abort(gc, &t);
-    libxl__device_list_free(&libxl__disk_devtype, disks, num);
-    libxl_device_disk_dispose(&disk_empty);
-    libxl_device_disk_dispose(&disk_saved);
-    libxl_domain_config_dispose(&d_config);
+    cdrom_insert_done(egc, cis, rc);
+}
 
-    if (lock) libxl__unlock_domain_userdata(lock);
+static void cdrom_insert_done(libxl__egc *egc,
+                              libxl__cdrom_insert_state *cis,
+                              int rc)
+{
+    STATE_AO_GC(cis->ao);
 
-    if (rc) return AO_CREATE_FAIL(rc);
-    return AO_INPROGRESS;
+    libxl_domain_config_dispose(&cis->d_config);
+    libxl_device_disk_dispose(&cis->disk_empty);
+    libxl_device_disk_dispose(&cis->disk_saved);
+    if (cis->lock) libxl__unlock_domain_userdata(cis->lock);
+    libxl__ao_complete(egc, ao, rc);
 }
 
 /* libxl__alloc_vdev only works on the local domain, that is the domain
-- 
Anthony PERARD


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