Re: [9fans] wstat and atomic directory change

[Giacomo Tesio <giacomo@tesio.it>]

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And unfortunately I cannot figure out any alternative, either. :-(

An interesting point is: why directory entries can be read but cannot be
written? I mean we use Tcreate to create a new file in a dir, while to be
uniform with files, we should use a Twrite, appending a corresponding stat
structure at the end of a directory entry.

However this solution probably has not been adopted to enable safe
concurrency in the file creation and removal.

However this asymmetry shows that directories cannot be (pratically)
handled in the same way of files.


Giacomo


2015-02-04 15:06 GMT+01:00 erik quanstrom <quanstro@quanstro.net>:

> > You are right.
> > But since protocol customizations goes against that same ideal, what's
> the
> > plan9 way of dealing with a feature X (in this specific case atomic file
> > moves)?
> >
> >
> > > this requires delving into the namespace to tell that the directories
> are
> > > still under the
> > > same mount, and some non-uniform operations.
> > >
> >
> > Good point. But thus, what are the alternatives?
>
> i wasn't holding out.  i don't have any suggestions.
>
> - erik
>
>

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