lkml.org 
[lkml]   [2006]   [Dec]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [PATCH] mm: fix page_mkclean_one (was: 2.6.19 file content corruption on ext3)
From
Date
On Fri, 2006-12-22 at 13:59 +0100, Martin Michlmayr wrote:
> * Martin Michlmayr <tbm@cyrius.com> [2006-12-22 13:32]:
> > I've completed one installation with Linus' patch plus the two from
> > Andrew successfully, but I'm currently trying again...
>
> .... and it failed.

Since you are on ARM you might want to try with the page_mkclean_one
cleanup patch too.

Arjan agreed that the loop is not needed; we clear the pte, flush on all
CPUs and then re-establish the pte. Any race will fault and be
serialised on the pte lock.

FWIW - with todays -git and Andrews second cancel_dirty_page() patch:
http://lkml.org/lkml/2006/12/22/49
I am unable to trigger any corruption - I could again earlier by raising
the number of seeds from 3 to 6. (am currently at 10 seeds)




From: Peter Zijlstra <a.p.zijlstra@chello.nl>

fix page_mkclean_one()

- add flush_cache_page() for all those virtual indexed cache
architectures.

- handle s390.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
mm/rmap.c | 38 +++++++++++++++++++++++++-------------
1 file changed, 25 insertions(+), 13 deletions(-)
Index: linux-2.6/mm/rmap.c
===================================================================
--- linux-2.6.orig/mm/rmap.c
+++ linux-2.6/mm/rmap.c
@@ -432,7 +432,7 @@ static int page_mkclean_one(struct page
{
struct mm_struct *mm = vma->vm_mm;
unsigned long address;
- pte_t *pte, entry;
+ pte_t *pte;
spinlock_t *ptl;
int ret = 0;

@@ -444,17 +444,18 @@ static int page_mkclean_one(struct page
if (!pte)
goto out;

- if (!pte_dirty(*pte) && !pte_write(*pte))
- goto unlock;
+ if (pte_dirty(*pte) || pte_write(*pte)) {
+ pte_t entry;

- entry = ptep_get_and_clear(mm, address, pte);
- entry = pte_mkclean(entry);
- entry = pte_wrprotect(entry);
- ptep_establish(vma, address, pte, entry);
- lazy_mmu_prot_update(entry);
- ret = 1;
+ flush_cache_page(vma, address, pte_pfn(*pte));
+ entry = ptep_clear_flush(vma, address, pte);
+ entry = pte_wrprotect(entry);
+ entry = pte_mkclean(entry);
+ set_pte_at(vma, address, pte, entry);
+ lazy_mmu_prot_update(entry);
+ ret = 1;
+ }

-unlock:
pte_unmap_unlock(pte, ptl);
out:
return ret;
@@ -489,6 +490,8 @@ int page_mkclean(struct page *page)
if (mapping)
ret = page_mkclean_file(mapping, page);
}
+ if (page_test_and_clear_dirty(page))
+ ret = 1;

return ret;
}



-
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: 2006-12-22 14:33    [from the cache]
©2003-2011 Jasper Spaans