NAME

     VOP_GETATTR, VOP_SETATTR — get and set attributes on a file or directory

SYNOPSIS

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

     int
     VOP_GETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred);

     int
     VOP_SETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred);

DESCRIPTION

     These entry points manipulate various attributes of a file or directory, including file
     permissions, owner, group, size, access time and modification time.

     The arguments are:

     vp    The vnode of the file.

     vap   The attributes of the file.

     cred  The user credentials of the calling process.

     Attributes which are not being modified by VOP_SETATTR() should be set to the value VNOVAL;
     VATTR_NULL() may be used to clear all the values, and should generally be used to reset the
     contents of *vap prior to setting specific values.

LOCKS

     VOP_GETATTR() expects the vnode to be locked on entry and will leave the vnode locked on
     return.  The lock type can be either shared or exclusive.

     VOP_SETATTR() expects the vnode to be locked on entry and will leave the vnode locked on
     return.  The lock type must be exclusive.

RETURN VALUES

     VOP_GETATTR() returns 0 if it was able to retrieve the attribute data via *vap, otherwise an
     appropriate error is returned.  VOP_SETATTR() returns zero if the attributes were changed
     successfully, otherwise an appropriate error is returned.

ERRORS

     [EPERM]            The file is immutable.

     [EACCES]           The caller does not have permission to modify the file or directory
                        attributes.

     [EROFS]            The file system is read-only.

SEE ALSO

     VFS(9), vnode(9), VOP_ACCESS(9)

AUTHORS

     This manual page was written by Doug Rabson.