[src/netbsd-1-5]: src/sys/ufs/ffs Apply patch (requested by fvdl):

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7629a2e42b82
branches:  netbsd-1-5
changeset: 492884:7629a2e42b82
user:      he <he%NetBSD.org@localhost>
date:      Tue Feb 26 21:13:18 2002 +0000

description:
Apply patch (requested by fvdl):
  Fix a panic in the FFS sofdep code on an NFS server triggered by
  an excerciser program run on an NFS client.

diffstat:

 sys/ufs/ffs/ffs_inode.c |  18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)

diffs (32 lines):

diff -r 36281a6b7682 -r 7629a2e42b82 sys/ufs/ffs/ffs_inode.c
--- a/sys/ufs/ffs/ffs_inode.c   Tue Feb 26 21:07:56 2002 +0000
+++ b/sys/ufs/ffs/ffs_inode.c   Tue Feb 26 21:13:18 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ffs_inode.c,v 1.35.2.2 2001/09/30 13:17:24 he Exp $    */
+/*     $NetBSD: ffs_inode.c,v 1.35.2.3 2002/02/26 21:13:18 he Exp $    */
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -291,6 +291,22 @@
                error = VOP_BALLOC(ovp, length - 1, 1, ap->a_cred, aflags, &bp);
                if (error)
                        return (error);
+               /*
+                * When we are doing soft updates and the VOP_BALLOC
+                * above fills in a direct block hole with a full sized
+                * block that will be truncated down to a fragment below,
+                * we must flush out the block dependency with an FSYNC
+                * so that we do not get a soft updates inconsistency
+                * when we create the fragment below.
+                */
+               if (DOINGSOFTDEP(ovp) && lbn < NDADDR &&
+                   fragroundup(fs, blkoff(fs, length)) < fs->fs_bsize) {
+                       error = VOP_FSYNC(ovp, ap->a_cred, FSYNC_WAIT, 0, 0,
+                           ap->a_p);
+                       if (error != 0)
+                               return error;
+               }
+
                oip->i_ffs_size = length;
                size = blksize(fs, oip, lbn);
                (void) uvm_vnp_uncache(ovp);