linux-kernel - Re: [PATCH] f2fs: enhance lookup xattr

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Date:   Sun, 29 Jan 2017 12:58:31 +0900
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH] f2fs: enhance lookup xattr

Hi Chao,

On 01/24, Chao Yu wrote:

...

>  
> -	error = read_all_xattrs(inode, ipage, &base_addr);
> +	error = lookup_all_xattrs(inode, ipage, index, len, name,
> +				&entry, &base_addr);
>  	if (error)
>  		return error;
>  
> -	entry = __find_xattr(base_addr, index, len, name);
> -	if (IS_XATTR_LAST_ENTRY(entry)) {
> -		error = -ENODATA;
> -		goto cleanup;
> -	}
> -
> -	size = le16_to_cpu(entry->e_value_size);
> +	size = __le16_to_cpu(entry->e_value_size);

Looks good to me, except __le16_to_cpu() here.
Do we need to use this instead of le16_to_cpu()?

Thanks,

>  
>  	if (buffer && size > buffer_size) {
>  		error = -ERANGE;
> -		goto cleanup;
> +		goto out;
>  	}
>  
> +	pval = entry->e_name + entry->e_name_len;
> +
>  	if (buffer) {
>  		char *pval = entry->e_name + entry->e_name_len;
>  		memcpy(buffer, pval, size);
>  	}
>  	error = size;
> -
> -cleanup:
> +out:
>  	kzfree(base_addr);
>  	return error;
>  }
> diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h
> index f990de20cdcd..d5a94928c116 100644
> --- a/fs/f2fs/xattr.h
> +++ b/fs/f2fs/xattr.h
> @@ -72,9 +72,10 @@ struct f2fs_xattr_entry {
>  		for (entry = XATTR_FIRST_ENTRY(addr);\
>  				!IS_XATTR_LAST_ENTRY(entry);\
>  				entry = XATTR_NEXT_ENTRY(entry))
> -
> -#define MIN_OFFSET(i)	XATTR_ALIGN(inline_xattr_size(i) + PAGE_SIZE -	\
> -				sizeof(struct node_footer) - sizeof(__u32))
> +#define MAX_XATTR_BLOCK_SIZE	(PAGE_SIZE - sizeof(struct node_footer))
> +#define VALID_XATTR_BLOCK_SIZE	(MAX_XATTR_BLOCK_SIZE - sizeof(__u32))
> +#define MIN_OFFSET(i)		XATTR_ALIGN(inline_xattr_size(i) +	\
> +						VALID_XATTR_BLOCK_SIZE)
>  
>  #define MAX_VALUE_LEN(i)	(MIN_OFFSET(i) -			\
>  				sizeof(struct f2fs_xattr_header) -	\
> -- 
> 2.8.2.295.g3f1c1d0