Re: [9fans] 9pfuse and O_APPEND

[Roman Shaposhnik <rvs@sun.com>]

On Dec 19, 2008, at 12:23 AM, Russ Cox wrote:
> Append-only and exclusive-use are properties of files
> and need to be enforced uniformly across all clients
> to be meaningful.  They must be per-file, not per-fd.


Two questions:
    1. But before I ask this one: I don't deny that per-file append-only
     is *extremely* useful. My question is a different one: what is
     the danger of N clients accesing the file X in append-only mode
     and M clients accesing it in random access mode? Could you,
     please, give a concrete scenario?

     2. Could you, please, answer the question in the original email
     of whether the kind of trivial patch (for the real thing you also
need
     to handle O_APPEND in the fusecreate)  I provided would be
acceptable
     for the inclusion into Hg? I have no problem maintaining the
extra code
     on the side, but if the change is deemed *not*
     to be acceptable that translates into it being dangerous or not
good
     enough. And if that's the case I'd really appreciate an
explanation to
     be given.

Thanks,
Roman.