Example #1
0
/**
 * mnt_context_prepare_umount:
 * @cxt: mount context
 *
 * Prepare context for umounting, unnecessary for mnt_context_umount().
 *
 * Returns: 0 on success, and negative number in case of error.
 */
int mnt_context_prepare_umount(struct libmnt_context *cxt)
{
	int rc;

	assert(cxt);
	assert(cxt->fs);
	assert(cxt->helper_exec_status == 1);
	assert(cxt->syscall_status == 1);

	if (!cxt || !cxt->fs || mnt_fs_is_swaparea(cxt->fs))
		return -EINVAL;
	if (!mnt_context_get_source(cxt) && !mnt_context_get_target(cxt))
		return -EINVAL;
	if (cxt->flags & MNT_FL_PREPARED)
		return 0;

	free(cxt->helper);	/* be paranoid */
	cxt->helper = NULL;
	cxt->action = MNT_ACT_UMOUNT;

	rc = lookup_umount_fs(cxt);
	if (!rc)
		rc = mnt_context_merge_mflags(cxt);
	if (!rc)
		rc = evaluate_permissions(cxt);

	if (!rc && !cxt->helper) {

		if (cxt->user_mountflags & MNT_MS_HELPER)
			/* on helper= mount option based helper */
			rc = prepare_helper_from_options(cxt, "helper");

		if (!rc && !cxt->helper)
			/* on fstype based helper */
			rc = mnt_context_prepare_helper(cxt, "umount", NULL);
	}

	if (!rc && (cxt->user_mountflags & MNT_MS_LOOP))
		/* loop option explicitly specified in mtab, detach this loop */
		mnt_context_enable_loopdel(cxt, TRUE);

	if (!rc && mnt_context_is_loopdel(cxt) && cxt->fs) {
		const char *src = mnt_fs_get_srcpath(cxt->fs);

		if (src && (!is_loopdev(src) || loopdev_is_autoclear(src)))
			mnt_context_enable_loopdel(cxt, FALSE);
	}

	if (rc) {
		DBG(CXT, mnt_debug_h(cxt, "umount: preparing failed"));
		return rc;
	}
	cxt->flags |= MNT_FL_PREPARED;
	return rc;
}
Example #2
0
/**
 * mnt_context_prepare_mount:
 * @cxt: context
 *
 * Prepare context for mounting, unnecessary for mnt_context_mount().
 *
 * Returns: negative number on error, zero on success
 */
int mnt_context_prepare_mount(struct libmnt_context *cxt)
{
	int rc = -EINVAL;

	assert(cxt);
	assert(cxt->fs);
	assert(cxt->helper_exec_status == 1);
	assert(cxt->syscall_status == 1);

	if (!cxt || !cxt->fs || mnt_fs_is_swaparea(cxt->fs))
		return -EINVAL;
	if (!mnt_fs_get_source(cxt->fs) && !mnt_fs_get_target(cxt->fs))
		return -EINVAL;
	if (cxt->flags & MNT_FL_PREPARED)
		return 0;

	cxt->action = MNT_ACT_MOUNT;

	DBG(CXT, mnt_debug_h(cxt, "mount: preparing"));

	/* TODO: fstab is unnecessary for MS_{MOVE,BIND,STARED,...} */
	rc = mnt_context_apply_fstab(cxt);
	if (!rc)
		rc = mnt_context_merge_mflags(cxt);
	if (!rc)
		rc = evaluate_permissions(cxt);
	if (!rc)
		rc = fix_optstr(cxt);
	if (!rc)
		rc = mnt_context_prepare_srcpath(cxt);
	if (!rc)
		rc = mnt_context_prepare_target(cxt);
	if (!rc)
		rc = mnt_context_guess_fstype(cxt);
	if (!rc)
		rc = mnt_context_prepare_helper(cxt, "mount", NULL);
	if (rc) {
		DBG(CXT, mnt_debug_h(cxt, "mount: preparing failed"));
		return rc;
	}
	cxt->flags |= MNT_FL_PREPARED;
	return rc;
}