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Added "flags" argument to msync, and implemented MS_ASYNC and MS_INVALIDATE.

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The MS_ASYNC flag doesn't current work, and MS_INVALIDATE will only toss out
the pages in the address space (not all pages in the shadow chain).
This commit is contained in:
David Greenman 1995-03-25 16:55:46 +00:00
parent bc4c84cf7e
commit e6c6af1149
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=7360
1 changed files with 11 additions and 14 deletions
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25
sys/vm/vm_mmap.c
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@ -38,7 +38,7 @@
* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
*
* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
* $Id: vm_mmap.c,v 1.17 1995/03/21 10:15:52 davidg Exp $
* $Id: vm_mmap.c,v 1.18 1995/03/22 05:08:41 davidg Exp $
*/
/*
@ -304,6 +304,7 @@ ommap(p, uap, retval)
struct msync_args {
caddr_t addr;
int len;
int flags;
};
int
msync(p, uap, retval)
@ -313,9 +314,9 @@ msync(p, uap, retval)
{
vm_offset_t addr;
vm_size_t size;
int flags;
vm_map_t map;
int rv;
boolean_t syncio, invalidate;
#ifdef DEBUG
if (mmapdebug & (MDB_FOLLOW | MDB_SYNC))
@ -327,6 +328,8 @@ msync(p, uap, retval)
map = &p->p_vmspace->vm_map;
addr = (vm_offset_t) uap->addr;
size = (vm_size_t) uap->len;
flags = uap->flags;
/*
* XXX Gak! If size is zero we are supposed to sync "all modified
* pages with the region containing addr". Unfortunately, we don't
@ -345,26 +348,19 @@ msync(p, uap, retval)
addr = entry->start;
size = entry->end - entry->start;
}
#ifdef DEBUG
if (mmapdebug & MDB_SYNC)
printf("msync: cleaning/flushing address range [%x-%x)\n",
addr, addr + size);
#endif
/*
* Could pass this in as a third flag argument to implement Sun's
* MS_ASYNC.
*/
syncio = TRUE;
/*
* XXX bummer, gotta flush all cached pages to ensure consistency with
* the file system cache. Otherwise, we could pass this in to
* implement Sun's MS_INVALIDATE.
*/
invalidate = TRUE;
/*
* Clean the pages and interpret the return value.
*/
rv = vm_map_clean(map, addr, addr + size, syncio, invalidate);
rv = vm_map_clean(map, addr, addr + size, (flags & MS_ASYNC) != 0,
(flags & MS_INVALIDATE) != 0);
switch (rv) {
case KERN_SUCCESS:
break;
@ -375,6 +371,7 @@ msync(p, uap, retval)
default:
return (EINVAL);
}
return (0);
}