[Dovecot] Fix? available for mmap on FreeBSD zfs (corrupted index files)

[Adam McDougall]

Ugh, I forgot a step you might need.  Due to the patching,
/usr/src/sys/cddl/compat/opensolaris/sys/acl.h and 
/usr/src/sys/cddl/compat/opensolaris/sys/callb.h become empty
and if they exist, should be deleted before compiling because
they will cause the compile to fail.  

On Mon, Jul 28, 2008 at 10:29:05PM -0400, Adam McDougall wrote:

  Just as a heads up since some dovecot users do use ZFS, pjd recently 
  posted a patch to upgrade ZFS in 8-current from v6 to v11 (latest from
  opensolaris).  Its reported to fix a number of problems, and add new 
  features.  The patch does not apply to 7, that won't be available for
  a while apparently, but they are looking for feedback on the fs or current
  mailing lists to encourage sooner integration (possibly by 7.1).  
  
  Quick instructions:
  fetch http://people.freebsd.org/~pjd/patches/zfs_20080727.patch.bz2
  bunzip2 zfs_20080727.patch.bz2
  cd /usr/src/
  patch -p0 < /path/to/zfs_20080727.patch
  do a FULL upgrade of world/kernel.
  
  kmem tweaks may still be needed but its a little more resilient than
  before, also 8-current now lets you configure a larger kmem than the 
  previous ~1.8G limit.  It is recommended to remove other tweaks from
  loader.conf such as zil_disable, etc and see how it does.  
  
  I've upgraded my laptop and so far so good, but I don't have dovecot 
  on any systems with ZFS so I can't test that aspect.
  
  On Fri, Apr 04, 2008 at 02:06:40PM -0400, Dillon Kass wrote:
  
    Hi, I've applied this patch to my 7-STABLE box and it doesn't help with 
    the corrupted dovecot index files.
    
    Anyone using dovecot with ZFS on FreeBSD should use mmap_disable = yes 
    in their dovecot.conf
    
    Cheers,
    Dillon
    
    Adam McDougall wrote:
    > Saw this just come through for 8-current,  7-stable ought to have it 
    > in a week or so.  I have not encountered the problem so I would not be 
    > able to judge if this fixes it.
    > Patch here: 
    > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c.diff?r1=1.27;r2=1.28 
    >
    >
    >
    > pjd         2008-03-15 23:23:04 UTC
    >
    >  FreeBSD src repository
    >
    >  Modified files:
    >    sys/contrib/opensolaris/uts/common/fs/zfs zfs_vnops.c  Log:
    >  Fix mmap(2) on ZFS after some changes in VM subsystem.
    >  
    >  Submitted by:   alc
    >  Reported by:    kris (originally) and many others
    >  Tested with:    fsx
    >  MFC after:      1 week
    >  
    >  Revision  Changes    Path
    >  1.28      +4 -0      
    > src/sys/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
    >