svn commit: r254086 - stable/9/sys/kern

[Konstantin Belousov]

Author: kib
Date: Thu Aug  8 06:00:42 2013
New Revision: 254086
URL: http://svnweb.freebsd.org/changeset/base/254086

Log:
  MFC r253187:
  Do not invalidate page of the B_NOCACHE buffer or buffer after an I/O
  error if any user wired mappings exist.

Modified:
  stable/9/sys/kern/vfs_bio.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/vfs_bio.c
==============================================================================
--- stable/9/sys/kern/vfs_bio.c	Thu Aug  8 05:52:41 2013	(r254085)
+++ stable/9/sys/kern/vfs_bio.c	Thu Aug  8 06:00:42 2013	(r254086)
@@ -1614,7 +1614,8 @@ brelse(struct buf *bp)
 					(PAGE_SIZE - poffset) : resid;
 
 				KASSERT(presid >= 0, ("brelse: extra page"));
-				vm_page_set_invalid(m, poffset, presid);
+				if (pmap_page_wired_mappings(m) == 0)
+					vm_page_set_invalid(m, poffset, presid);
 				if (had_bogus)
 					printf("avoided corruption bug in bogus_page/brelse code\n");
 			}