Author: rmacklem
Date: Sun May 15 00:45:17 2016
New Revision: 299816
URL: https://svnweb.freebsd.org/changeset/base/299816

Log:
  Fix fuse so that stale buffer cache data isn't read.
  
  When I/O on a file under fuse is switched from buffered to DIRECT_IO,
  it was possible to read stale (before a recent modification) data from
  the buffer cache. This patch invalidates the buffer cache for the
  file to fix this.
  
  PR:           194293
  MFC after:    2 weeks

Modified:
  head/sys/fs/fuse/fuse_node.c

Modified: head/sys/fs/fuse/fuse_node.c
==============================================================================
--- head/sys/fs/fuse/fuse_node.c        Sun May 15 00:42:18 2016        
(r299815)
+++ head/sys/fs/fuse/fuse_node.c        Sun May 15 00:45:17 2016        
(r299816)
@@ -289,7 +289,9 @@ fuse_vnode_open(struct vnode *vp, int32_
         * XXXIP: Handle fd based DIRECT_IO
         */
        if (fuse_open_flags & FOPEN_DIRECT_IO) {
+               ASSERT_VOP_ELOCKED(vp, __func__);
                VTOFUD(vp)->flag |= FN_DIRECTIO;
+               fuse_io_invalbuf(vp, td);
        } else {
                VTOFUD(vp)->flag &= ~FN_DIRECTIO;
        }
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