git: NFS - Properly handle NFSv3 EOF short-reads

[Antonio Huete Jimenez]

This was originally reported by Thomas Nikolajsen on issue 844
(http://bugs.dragonflybsd.org/issue844)

2009/8/25 Matthew Dillon <dillon at crater.dragonflybsd.org>:
>
> commit 28953d39b23eec3fbd96a46ca2c4946bfe8d1a61
> Author: Matthew Dillon <dillon at apollo.backplane.com>
> Date:   Mon Aug 24 15:41:42 2009 -0700
>
>    NFS - Properly handle NFSv3 EOF short-reads
>
>    * Short reads were not causing the remainder of the buffer to be
>      zero'd out in all cases, causing the fsx filesystem test to fail.
>
>    * An EOF condition was sometimes improperly reporting a non-zero
>      bp->b_resid.  Race against the server where the client's idea of
>      the file size differs from the server could result in a non-zero
>      bp->b_resid after a BIO.
>
>      Zero out the remaining space and and set bp->b_resid to 0.  The
>      NFS client code always specifies buffers within the bounds of
>      the file.
>
>    Reported-by: Antonio Huete Jimenez <tuxillo at quantumachine.net>
>
> Summary of changes:
>  sys/vfs/nfs/nfs_bio.c   |  136 ++++++++++++++++++++++------------------------
>  sys/vfs/nfs/nfs_vnops.c |   31 ++++++++---
>  2 files changed, 89 insertions(+), 78 deletions(-)
>
> http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/28953d39b23eec3fbd96a46ca2c4946bfe8d1a61
>
>
> --
> DragonFly BSD source repository
>