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Describe UFP_DIRTYONLY and UFP_BACKWARD flags to uvn_findpages.

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PR kern/49335
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riastradh 2015-03-23 08:00:33 +00:00
parent d32bef14a2
commit e3235bfa54
1 changed files with 19 additions and 1 deletions
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20
share/man/man9/uvm.9
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@ -1,4 +1,4 @@
.\" $NetBSD: uvm.9,v 1.107 2012/07/02 21:10:31 jym Exp $
.\" $NetBSD: uvm.9,v 1.108 2015/03/23 08:00:33 riastradh Exp $
.\"
.\" Copyright (c) 1998 Matthew R. Green
.\" All rights reserved.
@ -466,6 +466,8 @@ The flags can be
#define UFP_NOALLOC 0x02 /* don't allocate new pages */
#define UFP_NOCACHE 0x04 /* don't return pages which already exist */
#define UFP_NORDONLY 0x08 /* don't return PG_READONLY pages */
#define UFP_DIRTYONLY 0x10 /* stop at first clean pg, clean dirty pgs */
#define UFP_BACKWARD 0x20 /* find pages in reverse order */
.Ed
.Pp
.Dv UFP_ALL
@ -478,6 +480,22 @@ causes any pages which do not already exist to be skipped.
causes any pages which do already exist to be skipped.
.Dv UFP_NORDONLY
causes any pages which are marked PG_READONLY to be skipped.
.Dv UFP_DIRTYONLY
causes
.Fn uvn_findpages
to stop early at the first clean page, and as a side effect to mark
each dirty page as clean.
It is the caller's responsibility to write the pages back to permanent
storage before unbusying them.
.Dv UFP_BACKWARD
causes
.Fn uvn_findpages
to traverse the array of pages in reverse order, starting at the end.
If
.Fn uvn_findpages
returns early in this case, it will have filled
.Li * Ns Fa npagesp
entries at the end rather than beginning of the page array.
.Pp
.Fn uvm_vnp_setsize
sets the size of vnode