Correct fsck journal-recovery code to update a cylinder-group

check-hash after making changes to the cylinder group. The problem
was that the journal-recovery code was calling the libufs bwrite()
function instead of the cgput() function. The cgput() function updates
the cylinder-group check-hash before writing the cylinder group.

This change required the additions of the cgget() and cgput() functions
to the libufs API to avoid a gratuitous bcopy of every cylinder group
to be read or written. These new functions have been added to the
libufs manual pages. This was the first opportunity that I have had
to use and document the use of the EDOOFUS error code.

Reviewed by: kib
Reported by: emaste and others

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/libufs/libufs.3 b/lib/libufs/libufs.3
index 5b5dd9b1c898..595df91e0e95 100644
--- a/lib/libufs/libufs.3
+++ b/lib/libufs/libufs.3
@@ -7,7 +7,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 4, 2003
+.Dd January 19, 2018
 .Dt LIBUFS 3
 .Os
 .Sh NAME
@@ -55,8 +55,11 @@ to a string describing the error.
 .Sh SEE ALSO
 .Xr bread 3 ,
 .Xr bwrite 3 ,
+.Xr cgget 3 ,
+.Xr cgput 3 ,
 .Xr cgread 3 ,
 .Xr cgread1 3 ,
+.Xr cgwrite 3 ,
 .Xr cgwrite1 3 ,
 .Xr sbread 3 ,
 .Xr sbwrite 3 ,