Re: [RFC] atomic create+open

[Trond Myklebust <trond.myklebust@fys.uio.no>]

on den 12.10.2005 Klokka 13:01 (+0200) skreiv Miklos Szeredi:

> However I don't really like that the filesystem is reentered from
> lookup_instantiate_filp() via __dentry_open() and ->open().  Is this
> necessary?

If filesystems need to be able to change the value of f_mapping, then
yes, however if none of the potential users of lookup_instantiate_filp()
care about doing so, then we can get rid of it.
I don't care either way since we will not be supporting non-intent based
opens for NFSv4.

> I see you've fixed the O_TRUNC problem.  The accmode==3 case is still
> slightly broken, since now the file is being opened in read-write mode
> instead of no-read-no-write mode.  This probably won't break anything
> too badly though.

It is non-portable and it was never supported on NFSv4 anyway. If
someone cares, they can fix it, but I don't see much need.

> Equivalent and simpler:
> 
>      flags = nd->intent.open.flags - 1;
> 
> Note, that the access bits of intent.open.flags will never both be
> zero, so this is safe.

Agreed.

Cheers,
  Trond