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MFS: rev 1.187.2.27 through 1.187.2.29, fix MS_INVALIDATE semantics but

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provide a sysctl knob for reverting to old ones.
This commit is contained in:
Dag-Erling Smørgrav 2004-05-25 16:31:49 +00:00
parent 841caa96b4
commit 9507605f93
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=129725
1 changed files with 8 additions and 1 deletions
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9
sys/vm/vm_map.c
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@ -78,6 +78,8 @@ __FBSDID("$FreeBSD$");
#include <sys/file.h>
#include <sys/sysent.h>
#include <sys/shm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
@ -148,6 +150,10 @@ static void vm_map_zdtor(void *mem, int size, void *arg);
static void vmspace_zdtor(void *mem, int size, void *arg);
#endif
static int old_msync;
SYSCTL_INT(_vm, OID_AUTO, old_msync, CTLFLAG_RW, &old_msync, 0,
"Use old (insecure) msync behavior");
void
vm_map_startup(void)
{
@ -2086,7 +2092,8 @@ vm_map_entry_delete(vm_map_t map, vm_map_entry_t entry)
object == kernel_object || object == kmem_object) &&
(object->type == OBJT_DEFAULT || object->type == OBJT_SWAP)) {
vm_object_collapse(object);
vm_object_page_remove(object, offidxstart, offidxend, FALSE);
vm_object_page_remove(object, offidxstart, offidxend,
old_msync ? FALSE : TRUE);
if (object->type == OBJT_SWAP)
swap_pager_freespace(object, offidxstart, count);
if (offidxend >= object->size &&