lkml.org 
[lkml]   [2005]   [Oct]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Use of getblk differs between locations


On Thu, 13 Oct 2005, Jamie Lokier wrote:

> Mikulas Patocka wrote:
>> But discarding data sometimes on USB unplug is even worse than discarding
>> data always --- users will by experimenting learn that linux doesn't
>> discard write-cached data and reminds them to replug the device --- and
>> one day, randomly, they lose their data because of some memory management
>> condition...
>
> It should not happen provided the total amount of dirty data for
> detachable devices is restricted to allow enough room for opening a
> dialog.

That is possible ... you must also make sure that you do not hold an
important semaphore while waiting for some removable device (auditing VFS
for this will be a bit harder...)

Mikulas

> That's no different, in principle, than the restrictions that are used
> to ensure some types of kernel memory allocation always succeed.
>
> There's no exact calculation, just a notion of "this many megabytes
> should be enough for a dialog".
>
> -- Jamie
>
-
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: 2005-10-13 02:25    [W:0.188 / U:22.832 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site