linux-kernel - Re: [PATCH 2/3] fs/pstore: fs/squashfs: Change lz4 compressor functions to work with new version

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Date:   Thu, 22 Dec 2016 22:27:51 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>
Cc:     akpm@...ux-foundation.org, bongkyu.kim@....com,
        sergey.senozhatsky@...il.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 2/3] fs/pstore: fs/squashfs: Change lz4 compressor
 functions to work with new version

Cc Anton, Colin, Kees, Tony on this

https://marc.info/?l=linux-kernel&m=148226086323932

On (12/20/16 19:53), Sven Schmidt wrote:
> 
> This patch updates the fs/pstore and fs/squashfs to work with the
> new LZ4 kernel module version.
> 
> Signed-off-by: Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>
> ---
>  fs/pstore/platform.c      | 11 +++++------
>  fs/squashfs/lz4_wrapper.c |  3 +--
>  2 files changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
> index 729677e..037dc07 100644
> --- a/fs/pstore/platform.c
> +++ b/fs/pstore/platform.c
> @@ -342,7 +342,7 @@ static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)
>  {
>  	int ret;
>  
> -	ret = lz4_compress(in, inlen, out, &outlen, workspace);
> +	ret = LZ4_compress_default(in, out, inlen, outlen, workspace);
>  	if (ret) {
>  		pr_err("lz4_compress error, ret = %d!\n", ret);
>  		return -EIO;
> @@ -355,7 +355,7 @@ static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
>  {
>  	int ret;
>  
> -	ret = lz4_decompress_unknownoutputsize(in, inlen, out, &outlen);
> +	ret = LZ4_decompress_safe(in, out, inlen, outlen);
>  	if (ret) {
>  		pr_err("lz4_decompress error, ret = %d!\n", ret);
>  		return -EIO;
> @@ -366,7 +366,7 @@ static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
>  
>  static void allocate_lz4(void)
>  {
> -	big_oops_buf_sz = lz4_compressbound(psinfo->bufsize);
> +	big_oops_buf_sz = LZ4_compressBound(psinfo->bufsize);
>  	big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
>  	if (big_oops_buf) {
>  		workspace = kmalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
> @@ -493,7 +493,6 @@ static void pstore_dump(struct kmsg_dumper *dumper,
>  		if (!is_locked) {
>  			pr_err("pstore dump routine blocked in %s path, may corrupt error record\n"
>  				       , in_nmi() ? "NMI" : why);
> -			return;
>  		}
>  	} else {
>  		spin_lock_irqsave(&psinfo->buf_lock, flags);
> @@ -585,8 +584,8 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
>  		} else {
>  			spin_lock_irqsave(&psinfo->buf_lock, flags);
>  		}
> -		psinfo->write_buf(PSTORE_TYPE_CONSOLE, 0, &id, 0,
> -				  s, 0, c, psinfo);
> +		memcpy(psinfo->buf, s, c);
> +		psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, 0, c, psinfo);
>  		spin_unlock_irqrestore(&psinfo->buf_lock, flags);
>  		s += c;
>  		c = e - s;
> diff --git a/fs/squashfs/lz4_wrapper.c b/fs/squashfs/lz4_wrapper.c
> index ff4468b..c087a63 100644
> --- a/fs/squashfs/lz4_wrapper.c
> +++ b/fs/squashfs/lz4_wrapper.c
> @@ -108,8 +108,7 @@ static int lz4_uncompress(struct squashfs_sb_info *msblk, void *strm,
>  		put_bh(bh[i]);
>  	}
>  
> -	res = lz4_decompress_unknownoutputsize(stream->input, length,
> -					stream->output, &dest_len);
> +	res = LZ4_decompress_safe(stream->input, stream->output, length, (int)dest_len);
>  	if (res)
>  		return -EIO;
>  
> -- 
> 2.1.4
>