1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 1996 Doug Rabson 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd July 24, 1996 32.Os 33.Dt VOP_CREATE 9 34.Sh NAME 35.Nm VOP_CREATE , 36.Nm VOP_MKNOD , 37.Nm VOP_MKDIR , 38.Nm VOP_SYMLINK 39.Nd create a file, socket, fifo, device, directory or symlink 40.Sh SYNOPSIS 41.In sys/param.h 42.In sys/vnode.h 43.In sys/namei.h 44.Ft int 45.Fn VOP_CREATE "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap" 46.Ft int 47.Fn VOP_MKNOD "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap" 48.Ft int 49.Fn VOP_MKDIR "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap" 50.Ft int 51.Fn VOP_SYMLINK "struct vnode *dvp" "struct vnode **vpp" "struct componentname *cnp" "struct vattr *vap" "char *target" 52.Sh DESCRIPTION 53These entry points create a new file, socket, fifo, device, directory or symlink 54in a given directory. 55.Pp 56The arguments are: 57.Bl -tag -width target 58.It Fa dvp 59the locked vnode of the directory 60.It Fa vpp 61the address of a variable where the resulting locked vnode should be stored 62.It Fa cnp 63the pathname component created 64.It Fa vap 65the attributes that the new object should be created with 66.It Fa target 67the pathname of the target of the symlink 68.El 69.Pp 70These entry points are called after 71.Xr VOP_LOOKUP 9 72when an object is being created. 73.Sh LOCKS 74The directory, 75.Fa dvp 76will be locked on entry and must remain locked on return. 77If the call is successful, the new object will be returned locked. 78.Sh RETURN VALUES 79If successful, the vnode for the new object is placed in 80.Fa *vpp 81and zero is returned. 82Otherwise, an appropriate error is returned. 83.Sh PSEUDOCODE 84.Bd -literal 85int 86vop_create(struct vnode *dvp, 87 struct vnode **vpp, 88 struct componentname *cnp 89 struct vattr *vap) 90{ 91 int mode = MAKEIMODE(vap->va_type, vap->va_mode); 92 struct vnode *vp; 93 int error; 94 95 *vpp = NULL; 96 if ((mode & IFMT) == 0) 97 mode |= IFREG; 98 99 error = SOMEFS_VALLOC(dvp, mode, cnp->cn_cred, &vp); 100 if (error) 101 return error; 102 103 /* 104 * Update the permissions for the new vnode, including 105 * copying the group from the directory. 106 */ 107 ...; 108 109#ifdef QUOTA 110 /* 111 * Possibly check quota information. 112 */ 113 ...; 114#endif 115 116 /* 117 * Enter new vnode in directory, taking care that the vnode 118 * hits the disk before the directory contents are changed. 119 */ 120 error = ...; 121 122 if (error) 123 goto bad; 124 125 *vpp = vp; 126 127 return 0; 128 129bad: 130 /* 131 * Write error occurred trying to update the inode 132 * or the directory so must deallocate the inode. 133 */ 134 vput(vp); 135 136 /* 137 * Deallocate file system resources for vp. 138 */ 139 ...; 140 141 return error; 142} 143.Ed 144.Sh ERRORS 145.Bl -tag -width Er 146.It Bq Er ENOSPC 147The file system is full. 148.It Bq Er EDQUOT 149The user's file system space or inode quota would be exceeded. 150.El 151.Sh SEE ALSO 152.Xr VOP_LOOKUP 9 153.Sh HISTORY 154The function 155.Nm 156appeared in 157.Bx 4.3 . 158.Sh SEE ALSO 159.Xr vnode 9 160.Sh AUTHORS 161This man page was written by 162.An Doug Rabson . 163