mirror of
https://github.com/freebsd/freebsd-src
synced 2024-11-05 18:22:52 +00:00
129 lines
2.7 KiB
Groff
129 lines
2.7 KiB
Groff
.\" Author: Marshall Kirk McKusick <mckusick@freebsd.org>
|
|
.\" Date: January 19, 2018
|
|
.\" Description:
|
|
.\" Manual page for libufs functions:
|
|
.\" getinode(3)
|
|
.\" putinode(3)
|
|
.\"
|
|
.\" This file is in the public domain.
|
|
.\"
|
|
.Dd September 2, 2020
|
|
.Dt GETINODE 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getinode , putinode
|
|
.Nd fetch and store inodes on a UFS file system
|
|
.Sh LIBRARY
|
|
.Lb libufs
|
|
.Sh SYNOPSIS
|
|
.In ufs/ufs/dinode.h
|
|
.In ufs/ffs/fs.h
|
|
.In libufs.h
|
|
.Ft int
|
|
.Fn getinode "struct uufsd *disk" "union dinodep *dp" "ino_t inumber"
|
|
.Ft int
|
|
.Fn putinode "struct uufsd *disk"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn getinode
|
|
and
|
|
.Fn putinode
|
|
functions provide an inode fetch and store API for
|
|
.Xr libufs 3
|
|
consumers.
|
|
They operate on a userland UFS disk structure.
|
|
The
|
|
.Fn getinode
|
|
function fetches the specified inode from the filesystem.
|
|
The
|
|
.Fn putinode
|
|
function stores the most recently fetched inode to the filesystem.
|
|
.Pp
|
|
The
|
|
.Va dinodep
|
|
union is defined as:
|
|
.Bd -literal -offset indent
|
|
union dinodep {
|
|
struct ufs1_dinode *dp1;
|
|
struct ufs2_dinode *dp2;
|
|
};
|
|
.Ed
|
|
.Pp
|
|
Sample code to clear write permissions for inode number
|
|
.Fa inumber
|
|
stored on the filesystem described by
|
|
.Fa diskp .
|
|
.Bd -literal -offset indent
|
|
#include <sys/stat.h>
|
|
#include <err.h>
|
|
|
|
#include <ufs/ufs/dinode.h>
|
|
#include <ufs/ffs/fs.h>
|
|
#include <libufs.h>
|
|
|
|
void
|
|
clearwrite(struct uufsd *diskp, ino_t inumber)
|
|
{
|
|
union dinodep dp;
|
|
|
|
if (getinode(diskp, &dp, inumber) == -1)
|
|
err(1, "getinode: %s", diskp->d_error);
|
|
switch (diskp->d_ufs) {
|
|
case 1: /* UFS 1 filesystem */
|
|
dp.dp1->di_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
|
|
break;
|
|
case 2: /* UFS 2 filesystem */
|
|
dp.dp2->di_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
|
|
break;
|
|
default:
|
|
errx(1, "unknown filesystem type");
|
|
}
|
|
if (putinode(diskp) == -1)
|
|
err(1, "putinode: %s", diskp->d_error);
|
|
}
|
|
.Ed
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn getinode
|
|
and
|
|
.Fn putinode
|
|
functions return 0 on success, or \-1 in case of any error.
|
|
A string describing the error is stored in
|
|
.Fa diskp->d_error .
|
|
The global
|
|
.Fa errno
|
|
often provides additional information.
|
|
.Sh ERRORS
|
|
The function
|
|
.Fn getinode
|
|
may fail and set
|
|
.Va errno
|
|
for any of the errors specified for the library function
|
|
.Xr pread 2 .
|
|
It can also fail if the inode number is out of the range of inodes
|
|
in the filesystem.
|
|
.Pp
|
|
The function
|
|
.Fn putinode
|
|
may fail and set
|
|
.Va errno
|
|
for any of the errors specified for the library functions
|
|
.Xr ufs_disk_write 3
|
|
or
|
|
.Xr pwrite 2 .
|
|
.Pp
|
|
Additionally both functions may follow the
|
|
.Xr libufs 3
|
|
error methodologies in case of a device error.
|
|
.Sh SEE ALSO
|
|
.Xr pread 2 ,
|
|
.Xr pwrite 2 ,
|
|
.Xr libufs 3 ,
|
|
.Xr ufs_disk_write 3
|
|
.Sh HISTORY
|
|
These functions first appeared as part of
|
|
.Xr libufs 3
|
|
in
|
|
.Fx 13.0 .
|
|
.Sh AUTHORS
|
|
.An Marshall Kirk McKusick Aq Mt mckusick@FreeBSD.org
|