D53537.1775086449.diff
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	diff --git a/lib/libsys/posix_fallocate.2 b/lib/libsys/posix_fallocate.2
	--- a/lib/libsys/posix_fallocate.2
	+++ b/lib/libsys/posix_fallocate.2
	@@ -25,7 +25,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd March 30, 2020
	+.Dd November 2, 2025
	.Dt POSIX_FALLOCATE 2
	.Os
	.Sh NAME
	@@ -105,8 +105,7 @@
	.Fa len
	argument was less than or equal to zero, the
	.Fa offset
	-argument was less than zero,
	-or the operation is not supported by the file system.
	+argument was less than zero.
	.It Bq Er EIO
	An I/O error occurred while reading from or writing to a file system.
	.It Bq Er EINTEGRITY
	@@ -123,6 +122,8 @@
	The file descriptor
	.Fa fd
	has insufficient rights.
	+.It Bq Er EOPNOTSUPP
	+The operation is not supported by the file system.
	.It Bq Er ESPIPE
	The
	.Fa fd
	@@ -137,12 +138,29 @@
	The
	.Fn posix_fallocate
	system call conforms to
	-.St -p1003.1-2004 .
	+.St -p1003.1-2024 .
	.Sh HISTORY
	The
	.Fn posix_fallocate
	function appeared in
	.Fx 9.0 .
	+.Pp
	+Previous versions of
	+.Nm
	+used
	+.Er EINVAL
	+to indicate that the operation is not supported by the file system, as specified
	+in
	+.St -p1003.1
	+Base Specifications, Issue 7.
	+.St -p1003.1
	+Base Specifications, Issue 8 switched to requiring
	+.Er EOPNOTSUPP
	+for this error case.
	+ZFS adopted the latter convention in
	+.Fx 15.0 ,
	+and the remaining filesystems in base adopted it in
	+.Fx 15.1 .
	.Sh AUTHORS
	.Fn posix_fallocate
	and this manual page were initially written by