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: head/lib/libufs/sbread.3 131468 2004-07-02 18:00:03Z ru $

.Dd June 4, 2003 .Dt SBREAD 3 .Os .Sh NAME .Nm sbread , sbwrite .Nd read and write superblocks of a UFS filesystem .Sh LIBRARY .Lb libufs .Sh SYNOPSIS n sys/param.h n sys/mount.h n ufs/ufs/ufsmount.h n ufs/ufs/dinode.h n ufs/ffs/fs.h n 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, .Fa 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.

p The .Fn sbread and .Fn sbwrite functions return 0 on success or -1 on error. .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.

p 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