[9fans] p9p vs. linux 9fs mount

[9fans] p9p vs. linux 9fs mount

[dexen deVries]

p9p/linux question.

i can't get seem to get write access to acme's files as mounted via linux 9p 
driver (v9fs). read works OK, but writes are rejected.


# mount -t 9p '/tmp/ns.root.localhost:13/acme' /mnt/acme -o 
'trans=unix,uname=root'
# ls /mnt/acme
1/  2/  3/  4/  acme/  cons  consctl  draw/  editout  index  label  new/
# echo delete > /mnt/acme/1/ctl 
-bash: /mnt/acme/1/ctl: Permission denied


when mounted with debug=0x04, i see in dmesg that TRSTAT gets passed 
`uname=root', but TWSTAT gets `uname=(null)'.


what am i doing wrong?


tested with linux kernel version 3.9.0-rc3 and 3.5.0 and with recent p9p 
version.

-- 
dexen deVries

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Re: [9fans] p9p vs. linux 9fs mount

[Alexander Sychev]

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Hi,

On Thu, Apr 4, 2013 at 5:59 PM, dexen deVries <dexen.devries@gmail.com>wrote:

> p9p/linux question.
>
> i can't get seem to get write access to acme's files as mounted via linux
> 9p
> driver (v9fs). read works OK, but writes are rejected.
>

I understand my next question is not quite related, but do you need just to
mount Acme's file system  or to mount the file system via v9fs?
Acme has an experimental feature to mount the file system via FUSE, and
this solution works almost without troubles, you need just to specify a
mount point with flag '-m'.

--
Best regards,
  santucco

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Re: [9fans] p9p vs. linux 9fs mount

[erik quanstrom]

> > p9p/linux question.
> >
> > i can't get seem to get write access to acme's files as mounted via linux
> > 9p
> > driver (v9fs). read works OK, but writes are rejected.
> >
>
> I understand my next question is not quite related, but do you need just to
> mount Acme's file system  or to mount the file system via v9fs?
> Acme has an experimental feature to mount the file system via FUSE, and
> this solution works almost without troubles, you need just to specify a
> mount point with flag '-m'.

guess.  try >> instead of >.  > may try to remove the file first.

- erik

Re: [9fans] p9p vs. linux 9fs mount

[dexen deVries]

On Thursday 04 of April 2013 11:19:53 erik quanstrom wrote:
> 
> guess.  try >> instead of >.  > may try to remove the file first.

...

how do i send you cookies? ;-)


 # strace for `>'
open("/mnt/acme/2/ctl", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = -1 
EACCES (Permission denied)

 # strace for `>>'
open("/mnt/acme/2/ctl", O_WRONLY|O_CREAT|O_APPEND|O_LARGEFILE, 0666) = 3

with the difference being `O_TRUNC'.


cheers,
-- 
dexen deVries

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