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	then the special file is made available as a piece of swap			then the special file is made available as a piece of swap
	space by the			space by the
	.Xr swapon 8			.Xr swapon 8
	command at the end of the system reboot procedure.			command at the end of the system reboot procedure.
	For swap devices, the keyword			For swap devices, the keyword
	.Dq trimonce			.Dq trimonce
	triggers the delivery of a			triggers the delivery of a
	.Dv BIO_DELETE			.Dv BIO_DELETE
	command to the device to mark			command to the device.
	all blocks as unused.			This command marks the device's blocks as unused, except those that
				might store a disk label.
				This marking can erase a crash dump.
				To delay
				.Nm swapon
				for a device until after
				.Nm savecore
				has copied the crash dump to another location, use the
				.Dq late
				option.
	For vnode-backed swap spaces,			For vnode-backed swap spaces,
	.Dq file			.Dq file
	is supported in the			is supported in the
	.Fa fs_mntops			.Fa fs_mntops
	field.			field.
	When			When
	.Fa fs_spec			.Fa fs_spec
	is an			is an
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