linux-ext4 - Re: [PATCH 2/6] mm: Invalidate DAX radix tree entries only if appropriate

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Message-ID: <20161129221757.GA16608@linux.intel.com>
Date:   Tue, 29 Nov 2016 15:17:57 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-ext4@...r.kernel.org, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org, Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 2/6] mm: Invalidate DAX radix tree entries only if
 appropriate

On Thu, Nov 24, 2016 at 10:46:32AM +0100, Jan Kara wrote:
> Currently invalidate_inode_pages2_range() and invalidate_mapping_pages()
> just delete all exceptional radix tree entries they find. For DAX this
> is not desirable as we track cache dirtiness in these entries and when
> they are evicted, we may not flush caches although it is necessary. This
> can for example manifest when we write to the same block both via mmap
> and via write(2) (to different offsets) and fsync(2) then does not
> properly flush CPU caches when modification via write(2) was the last
> one.
> 
> Create appropriate DAX functions to handle invalidation of DAX entries
> for invalidate_inode_pages2_range() and invalidate_mapping_pages() and
> wire them up into the corresponding mm functions.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

For the DAX bits:
Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
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