lkml.org 
[lkml]   [2005]   [Oct]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] atomic create+open
From
Date
> The reason why we do it as a lookup intent is because this has to be
> atomic lookup+create+open in order to be at all useful to NFS.
>
> Just doing create+open atomically is worthless since it leaves you with
> a bunch of races where someone on the server can create, say, a symlink
> between the RPC call to lookup and the RPC call that creates the file.

That's easy to solve: filesystem returns -EAGAIN, namei_open() redoes
the lookup and continues with the resolving. There would have to be
some safeguard counter to avoid infinite loops.

Filesystem could even populate the dentry with the symlink in
->open_create() to optimize away the relookup.

Do you see a problem with that?

Miklos
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-10-06 19:08    [W:0.069 / U:0.436 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site