.\"     $NetBSD: vattr.9,v 1.15 2010/12/02 12:54:13 wiz Exp $
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Gregory McGarry.
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.Dd January 8, 2010
.Dt VATTR 9
.Os
.Sh NAME
.Nm vattr ,
.Nm vattr_null
.Nd vnode attributes
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.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 modification 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 */
        dev_t           va_fsid;        /* file system id (dev for now) */
        ino_t           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 */
        struct timespec va_birthtime;   /* time file created */
        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.
.El
.Sh CODE REFERENCES
.Fn vattr_null
is implemented in
.Pa sys/kern/vfs_subr.c .
.Sh SEE ALSO
.Xr intro 9 ,
.Xr vfs 9 ,
.Xr vnode 9 ,
.Xr vnodeops 9