Re: [PATCH 6.1.y 6.6.y 0/3] mm/filemap: fix page cache corruption with large folios

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Oct 02, 2024 at 05:06:22AM +0800, Kairui Song wrote:
> From: Kairui Song <kasong@tencent.com>
> 
> This series fixes the page cache corruption issue reported by Christian
> Theune [1]. The issue was reported affects kernels back to 5.19.
> Current maintained effected branches includes 6.1 and 6.6 and the fix
> was included in 6.10 already.
> 
> This series can be applied for both 6.1 and 6.6.
> 
> Patch 3/3 is the fixing patch. It was initially submitted and merge as
> an optimization but found to have fixed the corruption by handling race
> correctly.
> 
> Patch 1/3 and 2/3 is required for 3/3.
> 
> Patch 3/3 included some unit test code, making the LOC of the backport a
> bit higher, but should be OK to be kept, since they are just test code.
> 
> Note there seems still some unresolved problem in Link [1] but that
> should be a different issue, and the commits being backported have been
> well tested, they fix the corruption issue just fine.
> 
> Link: https://lore.kernel.org/linux-mm/A5A976CB-DB57-4513-A700-656580488AB6@flyingcircus.io/ [1]
> 
> Kairui Song (3):
>   mm/filemap: return early if failed to allocate memory for split
>   lib/xarray: introduce a new helper xas_get_order
>   mm/filemap: optimize filemap folio adding
> 
>  include/linux/xarray.h |  6 +++
>  lib/test_xarray.c      | 93 ++++++++++++++++++++++++++++++++++++++++++
>  lib/xarray.c           | 49 ++++++++++++++--------
>  mm/filemap.c           | 50 ++++++++++++++++++-----
>  4 files changed, 169 insertions(+), 29 deletions(-)
> 
> -- 
> 2.46.1
> 
> 

All now queued up, thanks.

greg k-h