int
tapdisk_image_open_chain(const char *desc, int flags, int prt_devnum,
struct list_head *head)
{
const char *name;
int type, err;
type = tapdisk_disktype_parse_params(desc, &name);
if (type >= 0)
return __tapdisk_image_open_chain(type, name, flags, head,
prt_devnum);
err = type;
if (err == -ENOENT && strlen(desc) >= 3) {
switch (desc[2]) {
case 'c':
if (!strncmp(desc, "x-chain", strlen("x-chain")))
err = tapdisk_image_open_x_chain(name, head);
break;
}
}
return err;
}
int
tapdisk_parse_disk_type(const char *params, const char **_path, int *_type)
{
int type;
type = tapdisk_disktype_parse_params(params, _path);
if (type < 0)
return type;
*_type = type;
return 0;
}
int
tapdisk_vbd_add_secondary(td_vbd_t *vbd)
{
td_image_t *leaf, *second = NULL;
const char *path;
int type, err;
DPRINTF("Adding secondary image: %s\n", vbd->secondary_name);
type = tapdisk_disktype_parse_params(vbd->secondary_name, &path);
if (type < 0)
return type;
leaf = tapdisk_vbd_first_image(vbd);
if (!leaf) {
err = -EINVAL;
goto fail;
}
err = tapdisk_image_open(type, path, leaf->flags, &second);
if (err)
goto fail;
if (second->info.size != leaf->info.size) {
EPRINTF("Secondary image size %"PRIu64" != image size %"PRIu64"\n",
second->info.size, leaf->info.size);
err = -EINVAL;
goto fail;
}
vbd->secondary = second;
leaf->flags |= TD_IGNORE_ENOSPC;
if (td_flag_test(vbd->flags, TD_OPEN_STANDBY)) {
DPRINTF("In standby mode\n");
vbd->secondary_mode = TD_VBD_SECONDARY_STANDBY;
} else {
DPRINTF("In mirror mode\n");
vbd->secondary_mode = TD_VBD_SECONDARY_MIRROR;
/* we actually need this image to also be part of the chain,
* since it may already contain data */
list_add(&second->next, &leaf->next);
}
DPRINTF("Added secondary image\n");
return 0;
fail:
if (second)
tapdisk_image_close(second);
return err;
}
