162 lines
4.3 KiB
Groff
162 lines
4.3 KiB
Groff
.\" -*- nroff -*-
|
|
.\"
|
|
.\" Copyright (c) 1996 Doug Rabson
|
|
.\"
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This program is free software.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 24, 1996
|
|
.Os
|
|
.Dt VOP_CREATE 9
|
|
.Sh NAME
|
|
.Nm VOP_CREATE ,
|
|
.Nm VOP_MKNOD ,
|
|
.Nm VOP_MKDIR ,
|
|
.Nm VOP_SYMLINK
|
|
.Nd create a file, socket, fifo, device, directory or symlink
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In sys/vnode.h
|
|
.In sys/namei.h
|
|
.Ft int
|
|
.Fn VOP_CREATE "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap"
|
|
.Ft int
|
|
.Fn VOP_MKNOD "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap"
|
|
.Ft int
|
|
.Fn VOP_MKDIR "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap"
|
|
.Ft int
|
|
.Fn VOP_SYMLINK "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap" "char *target"
|
|
.Sh DESCRIPTION
|
|
These entry points create a new file, socket, fifo, device, directory or symlink
|
|
in a given directory.
|
|
.Pp
|
|
The arguments are:
|
|
.Bl -tag -width target
|
|
.It Fa dvp
|
|
The locked vnode of the directory.
|
|
.It Fa vpp
|
|
The address of a variable where the resulting locked vnode should be stored.
|
|
.It Fa cnp
|
|
The pathname component created.
|
|
.It Fa vap
|
|
The attributes that the new object should be created with.
|
|
.It Fa target
|
|
The pathname of the target of the symlink.
|
|
.El
|
|
.Pp
|
|
These entry points are called after
|
|
.Xr VOP_LOOKUP 9
|
|
when an object is being created.
|
|
.Sh LOCKS
|
|
The directory,
|
|
.Fa dvp
|
|
will be locked on entry and must remain locked on return.
|
|
If the call is successful, the new object will be returned locked.
|
|
.Sh RETURN VALUES
|
|
If successful, the vnode for the new object is placed in
|
|
.Fa *vpp
|
|
and zero is returned.
|
|
Otherwise, an appropriate error is returned.
|
|
.Sh PSEUDOCODE
|
|
.Bd -literal
|
|
int
|
|
vop_create(struct vnode *dvp,
|
|
struct vnode **vpp,
|
|
struct componentname *cnp
|
|
struct vattr *vap)
|
|
{
|
|
int mode = MAKEIMODE(vap->va_type, vap->va_mode);
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
*vpp = NULL;
|
|
if ((mode & IFMT) == 0)
|
|
mode |= IFREG;
|
|
|
|
error = SOMEFS_VALLOC(dvp, mode, cnp->cn_cred, &vp);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Update the permissions for the new vnode, including
|
|
* copying the group from the directory.
|
|
*/
|
|
...;
|
|
|
|
#ifdef QUOTA
|
|
/*
|
|
* Possibly check quota information.
|
|
*/
|
|
...;
|
|
#endif
|
|
|
|
/*
|
|
* Enter new vnode in directory, taking care that the vnode
|
|
* hits the disk before the directory contents are changed.
|
|
*/
|
|
error = ...;
|
|
|
|
if (error)
|
|
goto bad;
|
|
|
|
*vpp = vp;
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
/*
|
|
* Write error occurred trying to update the inode
|
|
* or the directory so must deallocate the inode.
|
|
*/
|
|
vput(vp);
|
|
|
|
/*
|
|
* Deallocate file system resources for vp.
|
|
*/
|
|
...;
|
|
|
|
return error;
|
|
}
|
|
.Ed
|
|
.Sh ERRORS
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOSPC
|
|
The file system is full.
|
|
.It Bq Er EDQUOT
|
|
The user's file system space or inode quota would be exceeded.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr vnode 9 ,
|
|
.Xr VOP_LOOKUP 9
|
|
.Sh HISTORY
|
|
The function
|
|
.Nm
|
|
appeared in
|
|
.Bx 4.3 .
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Doug Rabson .
|