Re: [PATCH] fsdax: force clear dirty mark if CoW

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On Mon, 27 Mar 2023 11:19:01 +0800 Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> wrote:

> 
> 
> 在 2023/3/25 3:42, Andrew Morton 写道:
> > On Fri, 24 Mar 2023 10:28:00 +0000 Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx> wrote:
> > 
> >> XFS allows CoW on non-shared extents to combat fragmentation[1].  The
> >> old non-shared extent could be mwrited before, its dax entry is marked
> >> dirty.  To be able to delete this entry, clear its dirty mark before
> >> invalidate_inode_pages2_range().
> > 
> > What are the user-visible runtime effects of this flaw?
> 
> This bug won't leak or mess up the data of filesystem.  In dmesg it will 
> show like this:
> 
> [   28.512349] ------------[ cut here ]------------
> [   28.512622] WARNING: CPU: 2 PID: 5255 at fs/dax.c:390 
> dax_insert_entry+0x342/0x390
> 
> ...
>
>  >
>  > Are we able to identify a Fixes: target for this?  Perhaps
>  > f80e1668888f3 ("fsdax: invalidate pages when CoW")?
>  >
> 
> Yes, it is to fix this commit.

OK, thanks.  I added the extra changelog info, added the Fixes and a
cc:stable.

Some review from other fsdax developers would be helpful, please.




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