[PATCH xfsprogs 6.12] man: document the -n parent mkfs option

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Document the -n parent option to mkfs.xfs so that users will actually
know how to turn on directory parent pointers.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
This fell out at some point when hch and I were refactoring parent
pointers; can this be included in 6.12?
---
 man/man8/mkfs.xfs.8.in |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/man/man8/mkfs.xfs.8.in b/man/man8/mkfs.xfs.8.in
index a854b0e87cb1a2..95b3d42700cf0e 100644
--- a/man/man8/mkfs.xfs.8.in
+++ b/man/man8/mkfs.xfs.8.in
@@ -900,8 +900,20 @@ .SH OPTIONS
 
 When CRCs are enabled (the default), the ftype functionality is always
 enabled, and cannot be turned off.
 .IP
 In other words, this option is only tunable on the deprecated V4 format.
+.TP
+.BI parent= value
+This feature creates back references from child files to parent directories
+so that online repair can reconstruct broken directory files.
+The value is either 0 to disable the feature, or 1 to create parent pointers.
+
+By default,
+.B mkfs.xfs
+will not create parent pointers.
+This feature is only available for filesystems created with the (default)
+.B \-m crc=1
+option set.
 .RE
 .PP
 .PD 0