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Fixed a really bogus problem with msync ripping pages away from

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objects before they were written.  Also, don't allow processes
without write access to remove pages from vm_objects.
This commit is contained in:
John Dyson 1996-02-11 22:03:49 +00:00
parent 73d54b16b8
commit a02051c37a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=14036
1 changed files with 9 additions and 8 deletions
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17
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 1.31 1996/01/04 21:13:17 wollman Exp $
* $Id: vm_map.c,v 1.32 1996/01/19 03:59:52 dyson Exp $
*/
/*
@ -1529,16 +1529,17 @@ vm_map_clean(map, start, end, syncio, invalidate)
* the object before it completes is probably a very bad
* idea.
*/
if (current->protection & VM_PROT_WRITE)
if (current->protection & VM_PROT_WRITE) {
vm_object_page_clean(object,
OFF_TO_IDX(offset),
OFF_TO_IDX(offset + size),
syncio, TRUE);
if (invalidate)
vm_object_page_remove(object,
OFF_TO_IDX(offset),
OFF_TO_IDX(offset + size),
FALSE);
(syncio||invalidate)?1:0, TRUE);
if (invalidate)
vm_object_page_remove(object,
OFF_TO_IDX(offset),
OFF_TO_IDX(offset + size),
FALSE);
}
}
start += size;
}