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+.\" Author:	Juli Mallett <jmallett@FreeBSD.org>
+.\" Date:	June 04, 2003
+.\" Description:
+.\" 	Manual page for libufs functions:
+.\"		sbread(3)
+.\"		sbwrite(3)
+.\"
+.\" This file is in the public domain.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 4, 2003
+.Dt SBREAD 3
+.Os
+.Sh NAME
+.Nm sbread , sbwrite
+.Nd read and write superblocks of a UFS file system
+.Sh LIBRARY
+.Lb libufs
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.In ufs/ufs/ufsmount.h
+.In ufs/ufs/dinode.h
+.In ufs/ffs/fs.h
+.In libufs.h
+.Ft int
+.Fn sbread "struct uufsd *disk"
+.Ft int
+.Fn sbwrite "struct uufsd *disk" "int all"
+.Sh DESCRIPTION
+The
+.Fn sbread
+and
+.Fn sbwrite
+functions provide superblock reads and writes for
+.Xr libufs 3
+consumers.
+The
+.Fn sbread
+and
+.Fn sbwrite
+functions operate on the superblock field,
+.Va d_sb ,
+associated with a given userland UFS disk structure.
+Additionally, the
+.Fn sbwrite
+function will write to all superblock locations if the
+.Fa all
+value is non-zero.
+.Sh RETURN VALUES
+.Rv -std sbread sbwrite
+.Sh ERRORS
+The function
+.Fn sbread
+may fail and set
+.Va errno
+for any of the errors specified for the library function
+.Xr bread 3 .
+Additionally, it may follow the
+.Xr libufs 3
+error methodologies in situations where no usable superblock could be
+found.
+.Pp
+The function
+.Fn sbwrite
+may fail and set
+.Va errno
+for any of the errors specified for the library function
+.Xr bwrite 3 .
+.Sh SEE ALSO
+.Xr bread 3 ,
+.Xr bwrite 3 ,
+.Xr libufs 3
+.Sh HISTORY
+These functions first appeared as part of
+.Xr libufs 3
+in
+.Fx 5.0 .
+.Sh AUTHORS
+.An Juli Mallett Aq jmallett@FreeBSD.org