124 lines
4.8 KiB
Groff
124 lines
4.8 KiB
Groff
.\" $NetBSD: vattr.9,v 1.2 2001/10/22 08:21:33 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Gregory McGarry.
|
|
.\"
|
|
.\" 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.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``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 FOUNDATION OR CONTRIBUTORS
|
|
.\" 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.
|
|
.\"
|
|
.Dd October 21, 2001
|
|
.Dt VATTR 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm vattr ,
|
|
.Nm vattr_null ,
|
|
.Nm VATTR_NULL
|
|
.Nd vnode attributes
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/param.h>
|
|
.Fd #include <sys/vnode.h>
|
|
.Ft void
|
|
.Fn vattr_null "struct vattr *vap"
|
|
.Ft void
|
|
.Fn VATTR_NULL "struct vattr *vap"
|
|
.Sh DESCRIPTION
|
|
Vnode attributes describe attributes of a file or directory including
|
|
file permissions, owner, group, size, access time and modication time.
|
|
.Pp
|
|
A vnode attribute has the following structure:
|
|
.Pp
|
|
.Bd -literal
|
|
struct vattr {
|
|
enum vtype va_type; /* vnode type (for create) */
|
|
mode_t va_mode; /* files access mode and type */
|
|
nlink_t va_nlink; /* number of references to file */
|
|
uid_t va_uid; /* owner user id */
|
|
gid_t va_gid; /* owner group id */
|
|
long va_fsid; /* file system id (dev for now) */
|
|
long va_fileid; /* file id */
|
|
u_quad_t va_size; /* file size in bytes */
|
|
long va_blocksize; /* blocksize preferred for i/o */
|
|
struct timespec va_atime; /* time of last access */
|
|
struct timespec va_mtime; /* time of last modification */
|
|
struct timespec va_ctime; /* time file changed */
|
|
u_long va_gen; /* generation number of file */
|
|
u_long va_flags; /* flags defined for file */
|
|
dev_t va_rdev; /* device the special file represents */
|
|
u_quad_t va_bytes; /* bytes of disk space held by file */
|
|
u_quad_t va_filerev; /* file modification number */
|
|
u_int va_vaflags; /* operations flags, see below */
|
|
long va_spare; /* remain quad aligned */
|
|
};
|
|
.Ed
|
|
.Pp
|
|
A field value of VNOVAL represents a field whose value is unavailable
|
|
or which is not to be changed. Valid flag values for
|
|
.Em va_flags
|
|
are:
|
|
.Pp
|
|
.Bl -tag -offset indent -width VA_UTIMES_NULL -compact
|
|
.It VA_UTIMES_NULL
|
|
utimes argument was NULL
|
|
.It VA_EXCLUSIVE
|
|
exclusive create request
|
|
.El
|
|
.Pp
|
|
Vnode attributes for a file are set by the vnode operation
|
|
.Xr VOP_SETATTR 9 .
|
|
Vnode attributes for a file are retrieved by the vnode operation
|
|
.Xr VOP_GETATTR 9 .
|
|
For more information on vnode operations see
|
|
.Xr vnodeops 9 .
|
|
.Sh FUNCTIONS
|
|
.Bl -tag -width compact
|
|
.It Fn vattr_null "vap"
|
|
Set vnode attributes in
|
|
.Fa vap
|
|
to VNOVAL.
|
|
.It Fn VATTR_NULL "vap"
|
|
This function is an alias for
|
|
.Fn vattr_null .
|
|
.El
|
|
.Sh CODE REFERENCES
|
|
This section describes places within the
|
|
.Nx
|
|
source tree where actual code implementing or utilising the vnode
|
|
attributes can be found. All pathnames are relative to
|
|
.Pa /usr/src .
|
|
.Pp
|
|
The vnode attributes ares implemented within the file
|
|
.Pa sys/kern/vfs_subr.c .
|
|
.Sh SEE ALSO
|
|
.Xr intro 9 ,
|
|
.Xr vfs 9 ,
|
|
.Xr vnode 9 ,
|
|
.Xr vnodeops 9
|