NAME
uvn_attach,
uvm_vnp_setsize,
uvm_vnp_sync,
uvm_vnp_terminate,
uvm_vnp_uncache —
memory mapping files and
devices
SYNOPSIS
#include
<sys/param.h>
#include <uvm/uvm.h>
struct uvm_object *
uvn_attach(struct
vnode *vp, vm_prot_t
accessprot);
void
uvm_vnp_setsize(struct
vnode *vp, voff_t
newsize);
void
uvm_vnp_sync(struct
mount *mp);
void
uvm_vnp_terminate(struct
vnode *vp);
boolean_t
uvm_vnp_uncache(struct
vnode *vp);
DESCRIPTION
The
uvn_attach()
function attaches a UVM object to vnode vp, creating
the object if necessary. The object is returned.
The
uvm_vnp_setsize()
function sets the size of vnode vp to
newsize. Caller must hold a reference to the vnode. If
the vnode shrinks, pages no longer used are discarded. This function will be
removed when the file system and VM buffer caches are merged.
The
uvm_vnp_sync()
function flushes dirty vnodes from either the mount point passed in
mp, or all dirty vnodes if mp is
NULL. This function will be removed when the file
system and VM buffer caches are merged.
The
uvm_vnp_terminate()
function frees all VM resources allocated to vnode vp.
If the vnode still has references, it will not be destroyed; however all
future operations using this vnode will fail. This function will be removed
when the file system and VM buffer caches are merged.
The
uvm_vnp_uncache()
function disables vnode vp from persisting when all
references are freed. This function will be removed when the file system and
UVM caches are unified. Returns true if there is no active vnode.