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Fixed problem with msync causing a panic.

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Submitted by:	John Dyson
This commit is contained in:
David Greenman 1995-02-14 04:00:17 +00:00
parent 522bab9535
commit bf4bd9bd9b
1 changed files with 19 additions and 17 deletions
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36
sys/vm/vm_map.c
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@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_map.c,v 1.12 1995/01/24 10:13:02 davidg Exp $
* $Id: vm_map.c,v 1.13 1995/02/02 09:08:40 davidg Exp $
*/
/*
@ -1315,7 +1315,7 @@ vm_map_pageable(map, start, end, new_pageable)
* point to sharing maps, because we won't
* hold the lock on the sharing map.
*/
if (!entry->is_a_map) {
if (!entry->is_a_map && !entry->is_sub_map) {
if (entry->needs_copy &&
((entry->protection & VM_PROT_WRITE) != 0)) {
@ -1473,7 +1473,7 @@ vm_map_clean(map, start, end, syncio, invalidate)
for (current = entry; current->start < end; current = current->next) {
offset = current->offset + (start - current->start);
size = (end <= current->end ? end : current->end) - start;
if (current->is_a_map) {
if (current->is_a_map || current->is_sub_map) {
register vm_map_t smap;
vm_map_entry_t tentry;
vm_size_t tsize;
@ -1486,26 +1486,28 @@ vm_map_clean(map, start, end, syncio, invalidate)
size = tsize;
object = tentry->object.vm_object;
offset = tentry->offset + (offset - tentry->start);
vm_object_lock(object);
vm_map_unlock_read(smap);
} else {
object = current->object.vm_object;
}
if (object && (object->pager != NULL) &&
(object->pager->pg_type == PG_VNODE)) {
vm_object_lock(object);
}
/*
* Flush pages if writing is allowed. XXX should we continue
* on an error?
*/
if ((current->protection & VM_PROT_WRITE) &&
!vm_object_page_clean(object, offset, offset + size,
syncio, FALSE)) {
/*
* Flush pages if writing is allowed. XXX should we continue
* on an error?
*/
if ((current->protection & VM_PROT_WRITE) &&
!vm_object_page_clean(object, offset, offset + size,
syncio, FALSE)) {
vm_object_unlock(object);
vm_map_unlock_read(map);
return (KERN_FAILURE);
}
if (invalidate)
vm_object_page_remove(object, offset, offset + size);
vm_object_unlock(object);
vm_map_unlock_read(map);
return (KERN_FAILURE);
}
if (invalidate)
vm_object_page_remove(object, offset, offset + size);
vm_object_unlock(object);
start += size;
}