linux-kernel - Re: [PATCH] fs: f2fs: Use kmemdup

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Date:	Thu, 28 Mar 2013 08:24:13 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Alexandru Gheorghiu <gheorghiuandru@...il.com>
Cc:	Jaegeuk Kim <jaegeuk.kim@...sung.com>,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: f2fs: Use kmemdup

2013/3/28, Alexandru Gheorghiu <gheorghiuandru@...il.com>:
> Used kmemdup instead of kzalloc followed by memcpy.
> Patch found using coccinelle.
>
> Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@...il.com>
> ---
>  fs/f2fs/segment.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 777f17e..1758149 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1403,10 +1403,9 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
>  	bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
>  	src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
>
> -	dst_bitmap = kzalloc(bitmap_size, GFP_KERNEL);
> +	dst_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
>  	if (!dst_bitmap)
>  		return -ENOMEM;
> -	memcpy(dst_bitmap, src_bitmap, bitmap_size);
>
>  	/* init SIT information */
>  	sit_i->s_ops = &default_salloc_ops;
> --
> 1.7.9.5
Hi Alexandru.

There is another point to change kmemdup.
------------------------------------------------------------------------------------------------------
-       nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
-       nm_i->init_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
-       nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
+        nm_i->init_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
+        nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
+        nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
+        version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
+        if (!version_bitmap)
+                return -EFAULT;

-       nm_i->nat_bitmap = kzalloc(nm_i->bitmap_size, GFP_KERNEL);
-       if (!nm_i->nat_bitmap)
-               return -ENOMEM;
-       version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
-       if (!version_bitmap)
-               return -EFAULT;
+        nm_i->nat_bitmap = kmemdup(version_bitmap, nm_i->bitmap_size,
GFP_KERNEL);
+        if (!nm_i->nat_bitmap)
+                return -ENOMEM;

-       /* copy version bitmap */
-       memcpy(nm_i->nat_bitmap, version_bitmap, nm_i->bitmap_size);
-----------------------------------------------------------------------------------------------------

If you agree, Could you send the patch include the above one again ?

Thanks.
>
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