Beispiel #1
0
/**
 * fdisk_context_assign_device:
 * @fname: path to the device to be handled
 * @readonly: how to open the device
 *
 * If the @readonly flag is set to false, fdisk will attempt to open
 * the device with read-write mode and will fallback to read-only if
 * unsuccessful.
 *
 * Returns: 0 on success, < 0 on error.
 */
int fdisk_context_assign_device(struct fdisk_context *cxt,
				const char *fname, int readonly)
{
	int fd;

	DBG(CONTEXT, dbgprint("assigning device %s", fname));
	assert(cxt);

	reset_context(cxt);

	if (readonly == 1 || (fd = open(fname, O_RDWR|O_CLOEXEC)) < 0) {
		if ((fd = open(fname, O_RDONLY|O_CLOEXEC)) < 0)
			return -errno;
		readonly = 1;
	}

	cxt->dev_fd = fd;
	cxt->dev_path = strdup(fname);
	if (!cxt->dev_path)
		goto fail;

	fdisk_discover_topology(cxt);
	fdisk_discover_geometry(cxt);

	if (fdisk_read_firstsector(cxt) < 0)
		goto fail;

	/* detect labels and apply labes specific stuff (e.g geomery)
	 * to the context */
	fdisk_probe_labels(cxt);

	/* let's apply user geometry *after* label prober
	 * to make it possible to override in-label setting */
	fdisk_apply_user_device_properties(cxt);

	/* warn about obsolete stuff on the device if we aren't in
	 * list-only mode and there is not PT yet */
	if (!fdisk_context_listonly(cxt) && !fdisk_dev_has_disklabel(cxt))
		warn_wipe(cxt);

	DBG(CONTEXT, dbgprint("context %p initialized for %s [%s]",
			      cxt, fname,
			      readonly ? "READ-ONLY" : "READ-WRITE"));
	return 0;
fail:
	DBG(CONTEXT, dbgprint("failed to assign device"));
	return -errno;
}
Beispiel #2
0
/**
 * fdisk_assign_device:
 * @cxt: context
 * @fname: path to the device to be handled
 * @readonly: how to open the device
 *
 * Open the device, discovery topology, geometry, detect disklabel and switch
 * the current label driver to reflect the probing result.
 *
 * Note that this function resets all generic setting in context. If the @cxt
 * is nested context then the device is assigned to the parental context and
 * necessary properties are copied to the @cxt. The change is propagated in
 * child->parent direction only. It's impossible to use a different device for
 * primary and nested contexts.
 *
 * Returns: 0 on success, < 0 on error.
 */
int fdisk_assign_device(struct fdisk_context *cxt,
			const char *fname, int readonly)
{
	int fd;

	DBG(CXT, ul_debugobj(cxt, "assigning device %s", fname));
	assert(cxt);

	/* redirect request to parent */
	if (cxt->parent) {
		int rc, org = fdisk_is_listonly(cxt->parent);

		/* assign_device() is sensitive to "listonly" mode, so let's
		 * follow the current context setting for the parent to avoid 
		 * unwanted extra warnings. */
		fdisk_enable_listonly(cxt->parent, fdisk_is_listonly(cxt));

		rc = fdisk_assign_device(cxt->parent, fname, readonly);
		fdisk_enable_listonly(cxt->parent, org);

		if (!rc)
			rc = init_nested_from_parent(cxt, 0);
		if (!rc)
			fdisk_probe_labels(cxt);
		return rc;
	}

	reset_context(cxt);

	fd = open(fname, (readonly ? O_RDONLY : O_RDWR ) | O_CLOEXEC);
	if (fd < 0)
		return -errno;

	cxt->readonly = readonly;
	cxt->dev_fd = fd;
	cxt->dev_path = strdup(fname);
	if (!cxt->dev_path)
		goto fail;

	fdisk_discover_topology(cxt);
	fdisk_discover_geometry(cxt);

	if (fdisk_read_firstsector(cxt) < 0)
		goto fail;

	/* detect labels and apply labes specific stuff (e.g geomery)
	 * to the context */
	fdisk_probe_labels(cxt);

	/* let's apply user geometry *after* label prober
	 * to make it possible to override in-label setting */
	fdisk_apply_user_device_properties(cxt);

	/* warn about obsolete stuff on the device if we aren't in
	 * list-only mode and there is not PT yet */
	if (!fdisk_is_listonly(cxt) && !fdisk_has_label(cxt))
		warn_wipe(cxt);

	DBG(CXT, ul_debugobj(cxt, "initialized for %s [%s]",
			      fname, readonly ? "READ-ONLY" : "READ-WRITE"));
	return 0;
fail:
	DBG(CXT, ul_debugobj(cxt, "failed to assign device"));
	return -errno;
}