linux-kernel - Re: [PATCH 1/4] Squashfs: Refactor decompressor interface and code (V3)

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Date:	Tue, 19 Nov 2013 17:07:33 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Phillip Lougher <phillip@...ashfs.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Squashfs: Refactor decompressor interface and code
 (V3)

On Thu, Nov 14, 2013 at 05:14:16AM +0000, Phillip Lougher wrote:
> The decompressor interface and code was written from
> the point of view of single-threaded operation.  In doing
> so it mixed a lot of single-threaded implementation specific
> aspects into the decompressor code and elsewhere which makes it
> difficult to seamlessly support multiple different decompressor
> implementations.
> 
> This patch does the following:
> 
> 1.  It removes compressor_options parsing from the decompressor
>     init() function.  This allows the decompressor init() function
>     to be dynamically called to instantiate multiple decompressors,
>     without the compressor options needing to be read and parsed each
>     time.
> 
> 2.  It moves threading and all sleeping operations out of the
>     decompressors.  In doing so, it makes the decompressors
>     non-blocking wrappers which only deal with interfacing with
>     the decompressor implementation.
> 
> 3. It splits decompressor.[ch] into decompressor generic functions
>    in decompressor.[ch], and moves the single threaded
>    decompressor implementation into decompressor_single.c.
> 
> The result of this patch is Squashfs should now be able to
> support multiple decompressors by adding new decompressor_xxx.c
> files with specialised implementations of the functions in
> decompressor_single.c
> 
> V3:
>   * decompressor_single.c: Remove kfree(comp_opts) in error path
>   * of squashfs_decompressor_create()
>   * Double free of comp_opts found by static analysis, reported by
>   * Dan Carpenter
> 
> Signed-off-by: Phillip Lougher <phillip@...ashfs.org.uk>
Reviewed-by: Minchan Kim <minchan@...nel.org>

-- 
Kind regards,
Minchan Kim
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