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* [9fans] cfs
@ 2021-01-19 22:50 Steve Simon
  2021-01-20 16:52 ` [9fans] cfs Anthony Martin
  0 siblings, 1 reply; 3+ messages in thread
From: Steve Simon @ 2021-01-19 22:50 UTC (permalink / raw)
  To: 9fans

Hi all,

I am playing with cfs(4). It works nicely dialing to my fileserver but
fails if I try to use the existing /srv/boot channel.

failed with /srv/boot:

        sceolan% 5.out -d -n -F /srv/boot  -f $cfs -S /n/cache
        <-client: Tversion tag 65535 msize 8216 version '9P2000'
        ->server: Tversion tag 65535 msize 8216 version '9P2000'
        5.out: write failed, inappropriate use of fd

works using dial:

        sceolan% 5.out -d -F /srv/boot  -f $cfs -S /n/cache
        <-client: Tversion tag 65535 msize 8216 version '9P2000'
        ->server: Tversion tag 65535 msize 8216 version '9P2000'
        <-server: Rversion tag 65535 msize 8216 version '9P2000'
        ->client: Rversion tag 65535 msize 8216 version '9P2000'
        <-client: Tauth tag 13 afid 402 uname steve aname 
        ->server: Tauth tag 13 afid 402 uname steve aname 
        <-server: Rauth tag 13 qid (0000000000000192 0 A)
        ->client: Rauth tag 13 qid (0000000000000192 0 A)
        <-client: Tread tag 13 fid 402 offset 0 count 2048

Note: using -n or not makes no differnce to the failed version,
though I would expect to need -n with /srv/boot.

The error occurs on the first write to /srv/boot.

I can mount /srv/boot with mount(1) without problems.

What have I missed?

-Steve

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* [9fans] Re: cfs
  2021-01-19 22:50 [9fans] cfs Steve Simon
@ 2021-01-20 16:52 ` Anthony Martin
  2021-01-20 17:25   ` Richard Miller
  0 siblings, 1 reply; 3+ messages in thread
From: Anthony Martin @ 2021-01-20 16:52 UTC (permalink / raw)
  To: 9fans

Steve Simon <steve@quintile.net> once said:
> The error occurs on the first write to /srv/boot.
>
> I can mount /srv/boot with mount(1) without problems.
>
> What have I missed?

The kernel doesn't allow you to explicitly read from
or write to a channel that the mount driver is using.

Cheers,
  Anthony

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* Re: [9fans] Re: cfs
  2021-01-20 16:52 ` [9fans] cfs Anthony Martin
@ 2021-01-20 17:25   ` Richard Miller
  0 siblings, 0 replies; 3+ messages in thread
From: Richard Miller @ 2021-01-20 17:25 UTC (permalink / raw)
  To: 9fans

> The kernel doesn't allow you to explicitly read from
> or write to a channel that the mount driver is using.

Correct, and one way around the obstacle is to include cfs
in the bootdir section of the kernel config file, and
optionally cfs=<partition> in plan9.ini or config.txt,
so the boot process will start cfs on /srv/boot before
mounting it.


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end of thread, other threads:[~2021-01-20 17:25 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-01-19 22:50 [9fans] cfs Steve Simon
2021-01-20 16:52 ` [9fans] cfs Anthony Martin
2021-01-20 17:25   ` Richard Miller

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