lkml.org 
[lkml]   [2003]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Race between vmtruncate and mapped areas?
Dave McCracken <dmccr@us.ibm.com> wrote:
>
> Actually it does fix it. I added code in vmtruncate_list() to do a
> down_write(&vma->vm_mm->mmap_sem) around the zap_page_range(), and the
> problem went away. It serializes against any outstanding page faults on a
> particular page table. New faults will see that the page is no longer in
> the file and fail with SIGBUS. Andrew's test case stopped failing.
>
> I've attached the patch so you can see what I did.
>
> Can anyone think of any gotchas to this solution?

mmap_sem nests outside i_shared_sem.
-
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: 2005-03-22 13:35    [from the cache]
©2003-2011 Jasper Spaans