7f67dadf9f
Basically the advice on freeing the componentname buffers is no longer correct. Update the example code.
163 lines
4.3 KiB
Groff
163 lines
4.3 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1996 Doug Rabson
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 24, 1996
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.Os
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.Dt VOP_CREATE 9
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.Sh NAME
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.Nm VOP_CREATE ,
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.Nm VOP_MKNOD ,
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.Nm VOP_MKDIR ,
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.Nm VOP_SYMLINK
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.Nd create a file, socket, fifo, device, directory or symlink
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.In sys/namei.h
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.Ft int
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.Fn VOP_CREATE "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap"
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.Ft int
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.Fn VOP_MKNOD "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap"
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.Ft int
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.Fn VOP_MKDIR "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap"
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.Ft int
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.Fn VOP_SYMLINK "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap" "char *target"
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.Sh DESCRIPTION
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These entry points create a new file, socket, fifo, device, directory or symlink
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in a given directory.
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.Pp
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The arguments are:
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.Bl -tag -width target
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.It Fa dvp
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the locked vnode of the directory
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.It Fa vpp
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the address of a variable where the resulting locked vnode should be stored
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.It Fa cnp
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the pathname component created
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.It Fa vap
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the attributes that the new object should be created with
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.It Fa target
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the pathname of the target of the symlink
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.El
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.Pp
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These entry points are called after
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.Xr VOP_LOOKUP 9
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when an object is being created.
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.Sh LOCKS
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The directory,
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.Fa dvp
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will be locked on entry and must remain locked on return.
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If the call is successful, the new object will be returned locked.
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.Sh RETURN VALUES
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If successful, the vnode for the new object is placed in
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.Fa *vpp
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and zero is returned.
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Otherwise, an appropriate error is returned.
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.Sh PSEUDOCODE
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.Bd -literal
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int
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vop_create(struct vnode *dvp,
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struct vnode **vpp,
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struct componentname *cnp
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struct vattr *vap)
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{
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int mode = MAKEIMODE(vap->va_type, vap->va_mode);
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struct vnode *vp;
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int error;
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*vpp = NULL;
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if ((mode & IFMT) == 0)
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mode |= IFREG;
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error = SOMEFS_VALLOC(dvp, mode, cnp->cn_cred, &vp);
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if (error)
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return error;
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/*
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* Update the permissions for the new vnode, including
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* copying the group from the directory.
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*/
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...;
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#ifdef QUOTA
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/*
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* Possibly check quota information.
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*/
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...;
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#endif
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/*
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* Enter new vnode in directory, taking care that the vnode
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* hits the disk before the directory contents are changed.
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*/
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error = ...;
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if (error)
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goto bad;
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*vpp = vp;
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return 0;
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bad:
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/*
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* Write error occurred trying to update the inode
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* or the directory so must deallocate the inode.
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*/
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vput(vp);
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/*
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* Deallocate file system resources for vp.
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*/
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...;
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return error;
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}
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.Ed
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er ENOSPC
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The file system is full.
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.It Bq Er EDQUOT
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The user's file system space or inode quota would be exceeded.
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.El
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.Sh SEE ALSO
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.Xr VOP_LOOKUP 9
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.Sh HISTORY
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The function
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.Nm
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appeared in
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.Bx 4.3 .
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.Sh SEE ALSO
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.Xr vnode 9
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.Sh AUTHORS
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This man page was written by
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.An Doug Rabson .
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