Manual browser: vattr(9)

VATTR(9) Kernel Developer's Manual VATTR(9)


vattr, vattr_nullvnode attributes


#include <sys/param.h>
#include <sys/vnode.h>

vattr_null(struct vattr *vap);


Vnode attributes describe attributes of a file or directory including file permissions, owner, group, size, access time and modification time.

A vnode attribute has the following structure:

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 */ 

A field value of VNOVAL represents a field whose value is unavailable or which is not to be changed. Valid flag values for va_flags are:

utimes argument was NULL
exclusive create request

Vnode attributes for a file are set by the vnode operation VOP_SETATTR(9). Vnode attributes for a file are retrieved by the vnode operation VOP_GETATTR(9). For more information on vnode operations see vnodeops(9).


Set vnode attributes in vap to VNOVAL.


vattr_null() is implemented in sys/kern/vfs_subr.c.
January 8, 2010 NetBSD 7.0