lkml.org 
[lkml]   [2007]   [Jan]   [15]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateMon, 15 Jan 2007 13:11:21 +0100
FromHelge Hafting <>
SubjectRe: O_DIRECT question
Michael Tokarev wrote:
> Chris Mason wrote:> []> >> I recently spent some time trying to integrate O_DIRECT locking with
>> page cache locking.  The basic theory is that instead of using
>> semaphores for solving O_DIRECT vs buffered races, you put something
>> into the radix tree (I call it a placeholder) to keep the page cache
>> users out, and lock any existing pages that are present.
>> >> But seriously - what about just disallowing non-O_DIRECT opens together
> with O_DIRECT ones ?> 
Please do not create a new local DOS attack.
I open some important file, say /etc/resolv.conf
with O_DIRECT and just sit on the open handle.
Now nobody else can open that file because
it is "busy" with O_DIRECT ?

Helge Hafting
-
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: 2007-01-15 12:39    [from the cache]
©2003-2008