Author: kib
Date: Thu Jul 11 05:36:26 2013
New Revision: 253187
URL: http://svnweb.freebsd.org/changeset/base/253187
Log:
Do not invalidate page of the B_NOCACHE buffer or buffer after an I/O
error if any user wired mappings exist. Doing the invalidation
destroys the user wiring.
The change is the temporal measure to close the bug, the more proper
fix is to delegate the invalidation of the page to upper layers
always.
Reported and tested by: pho
Reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Modified:
head/sys/kern/vfs_bio.c
Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c Thu Jul 11 05:15:30 2013 (r253186)
+++ head/sys/kern/vfs_bio.c Thu Jul 11 05:36:26 2013 (r253187)
@@ -1692,7 +1692,8 @@ brelse(struct buf *bp)
KASSERT(presid >= 0, ("brelse: extra page"));
VM_OBJECT_WLOCK(obj);
- vm_page_set_invalid(m, poffset, presid);
+ if (pmap_page_wired_mappings(m) == 0)
+ vm_page_set_invalid(m, poffset, presid);
VM_OBJECT_WUNLOCK(obj);
if (had_bogus)
printf("avoided corruption bug in
bogus_page/brelse code\n");
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
