Re: [PATCH 0/7 V4] The NFSv4 only mounting daemon.

[Steve Dickson <SteveD@RedHat.com>]

On 3/3/21 10:23 AM, J. Bruce Fields wrote:
> On Tue, Mar 02, 2021 at 05:33:23PM -0500, Steve Dickson wrote:
>>
>>
>> On 2/24/21 3:30 PM, J. Bruce Fields wrote:
>>> On Fri, Feb 19, 2021 at 03:08:08PM -0500, Steve Dickson wrote:
>>>> nfsv4.exportd is a daemon that will listen for only v4 mount upcalls.
>>>> The idea is to allow distros to build a v4 only package
>>>> which will have a much smaller footprint than the
>>>> entire nfs-utils package.
>>>>
>>>> exportd uses no RPC code, which means none of the 
>>>> code or arguments that deal with v3 was ported, 
>>>> this again, makes the footprint much smaller. 
>>>
>>> How much smaller?
>> Will a bit smaller... but a number of daemons like nfsd[cld,clddb,cldnts]
>> need to also come a long. 
> 
> Could we get some numbers?
> 
> Looks like nfs-utils in F33 is about 1.2M:
> 
> $ rpm -qi nfs-utils|grep ^Size
> Size        : 1243512
Here are the numbers. Remember things are still in development so
these may not be the final numbers

For the v4 only client
rpm -qi nfsv4-client-utils-2* | grep ^Size
Size        : 374573

for the v4only server:
rpm -qi nfsv4-utils-2* | grep ^Size
Size        : 942088
> 
> $ strip utils/mountd/mountd
> $ ls -lh utils/mountd/mountd
> -rwxrwxr-x. 1 bfields bfields 128K Mar  3 10:12 utils/mountd/mountd
> $ strip utils/exportd/exportd
> $ ls -lh utils/exportd/exportd
> -rwxrwxr-x. 1 bfields bfields 106K Mar  3 10:12 utils/exportd/exportd
> 
> So replacing mountd by exportd saves us about 20K out of 1.2M.  Is it
> worth it?
Looking at the numbers above... I think it is.

steved. 

> 
>>>> The following options were ported:
>>>>     * multiple threads
>>>>     * state-directory-path option
>>>>     * junction support (not tested)
>>>>
>>>> The rest of the mountd options were v3 only options.
>>>
>>> There's also --manage-gids.
>> Right... a patch was posted... 
>>
>>>
>>> If you want nfsv4-only at runtime, you can always run rpc.mountd with
>>> -N2 -N3 to turn off the MOUNT protocol support.
>> The end game is not to run mountd at all... 
>>
>>>
>>> If you don't even want v2/f3 code on your system, then you may have to
>>> do something like this, but why is that important?
>> Container friendly... Not bring in all the extra daemons v3
>> needs is a good thing... esp rpcbind. 
> 
> Looking at the output of
> $ for f in $(rpm -ql nfs-utils); do if [ -f $f ]; then ls -ls $f; fi; done|sort -n
> 
> It looks like removing statd, sm-notify, showount and their man pages
> would free about another 170K.
> 
> I think that's about how much we'd save by seperating out a separate
> documentation package.
> 
> I don't know, what sort of gains are container folks asking for?
> 
> --b.
> 
>>
>> steved.
>>
>>>
>>> --b.
>>>
>>>>
>>>> V2:
>>>>   * Added two systemd services: nfsv4-exportd and nfsv4-server
>>>>   * nfsv4-server starts rpc.nfsd -N 3, so nfs.conf mod not needed.
>>>>
>>>> V3: Changed the name from exportd to nfsv4.exportd
>>>>
>>>> V4: Added compile flag that will compile in the NFSv4 only server
>>>>
>>>> Steve Dickson (7):
>>>>   exportd: the initial shell of the v4 export support
>>>>   exportd: Moved cache upcalls routines into libexport.a
>>>>   exportd: multiple threads
>>>>   exportd/exportfs: Add the state-directory-path option
>>>>   exportd: Enabled junction support
>>>>   exportd: systemd unit files
>>>>   exportd: Added config variable to compile in the NFSv4 only server.
>>>>
>>>>  .gitignore                                |   1 +
>>>>  configure.ac                              |  14 ++
>>>>  nfs.conf                                  |   4 +
>>>>  support/export/Makefile.am                |   3 +-
>>>>  {utils/mountd => support/export}/auth.c   |   4 +-
>>>>  {utils/mountd => support/export}/cache.c  |  46 +++-
>>>>  support/export/export.h                   |  34 +++
>>>>  {utils/mountd => support/export}/fsloc.c  |   0
>>>>  {utils/mountd => support/export}/v4root.c |   0
>>>>  {utils/mountd => support/include}/fsloc.h |   0
>>>>  systemd/Makefile.am                       |   6 +
>>>>  systemd/nfs.conf.man                      |  10 +
>>>>  systemd/nfsv4-exportd.service             |  12 +
>>>>  systemd/nfsv4-server.service              |  31 +++
>>>>  utils/Makefile.am                         |   4 +
>>>>  utils/exportd/Makefile.am                 |  65 +++++
>>>>  utils/exportd/exportd.c                   | 276 ++++++++++++++++++++++
>>>>  utils/exportd/exportd.man                 |  81 +++++++
>>>>  utils/exportfs/exportfs.c                 |  21 +-
>>>>  utils/exportfs/exportfs.man               |   7 +-
>>>>  utils/mountd/Makefile.am                  |   5 +-
>>>>  21 files changed, 606 insertions(+), 18 deletions(-)
>>>>  rename {utils/mountd => support/export}/auth.c (99%)
>>>>  rename {utils/mountd => support/export}/cache.c (98%)
>>>>  create mode 100644 support/export/export.h
>>>>  rename {utils/mountd => support/export}/fsloc.c (100%)
>>>>  rename {utils/mountd => support/export}/v4root.c (100%)
>>>>  rename {utils/mountd => support/include}/fsloc.h (100%)
>>>>  create mode 100644 systemd/nfsv4-exportd.service
>>>>  create mode 100644 systemd/nfsv4-server.service
>>>>  create mode 100644 utils/exportd/Makefile.am
>>>>  create mode 100644 utils/exportd/exportd.c
>>>>  create mode 100644 utils/exportd/exportd.man
>>>>
>>>> -- 
>>>> 2.29.2
>>>
>