D31604.id93898.diff
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	Index: lib/libc/sys/fspacectl.2
	===================================================================
	--- lib/libc/sys/fspacectl.2
	+++ lib/libc/sys/fspacectl.2
	@@ -27,7 +27,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd August 4, 2021
	+.Dd August 18, 2021
	.Dt FSPACECTL 2
	.Os
	.Sh NAME
	@@ -67,6 +67,12 @@
	.Fa spacectl_range
	structure it points to is updated to contain the unprocessed operation range
	after the system call returns.
	+If
	+.Fa "rmsr->r_len"
	+is zero after the system call returns success,
	+.Fa "rmsr->r_offset"
	+should be ignored.
	+The file descriptor's file offset is not used or modified by the system call.
	Both
	.Fa rqsr
	and
	@@ -92,9 +98,9 @@
	.Fa rqsr
	argument.
	The
	-.Va "rqsr->r_offset"
	+.Fa "rqsr->r_offset"
	has to be a value greater than or equal to 0, and the
	-.Va "rqsr->r_len"
	+.Fa "rqsr->r_len"
	has to be a value greater than 0.
	.Pp
	If the file system supports hole-punching,
	@@ -137,6 +143,12 @@
	.Fa "range->r_len"
	argument was less than or equal to zero.
	.It Bq Er EINVAL
	+The value of
	+.Fa "range->r_offset" +
	+.Fa "range->r_len"
	+is greater than
	+.Dv OFF_MAX .
	+.It Bq Er EINVAL
	An invalid or unsupported flag is included in
	.Fa flags .
	.It Bq Er EINVAL
	Index: sys/kern/vfs_default.c
	===================================================================
	--- sys/kern/vfs_default.c
	+++ sys/kern/vfs_default.c
	@@ -1186,7 +1186,8 @@
	break;
	}
	out:
	- *ap->a_offset = offset;
	+ if (error != 0 \|\| len != 0)
	+ *ap->a_offset = offset;
	*ap->a_len = len;
	return (error);
	}