linux-ext4 - Re: [PATCH V4 01/22] ext4: Move extra inode read to a new function.

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Message-Id: <77C00684-DB5E-4BDC-A500-9128D8BD0BC3@dilger.ca>
Date:	Mon, 20 Feb 2012 23:51:14 -0700
From:	Andreas Dilger <aedilger@...il.com>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH V4 01/22] ext4: Move extra inode read to a new function.

On 2012-02-20, at 12:01 AM, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
> 
> Currently, in ext4_iget we do a simple check to see whether
> there does exist some information starting from the end
> of i_extra_size. With inline data added, this procedure
> is more complicated. So move it to a new function named
> ext4_iget_extra_inode.
> 
> Signed-off-by: Tao Ma <boyu.mt@...bao.com>
> ---
> fs/ext4/inode.c |   19 ++++++++++++-------
> 1 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index feaa82f..0b2d6c1 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3610,6 +3610,16 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
> 	}
> }
> 
> +static inline void ext4_iget_extra_inode(struct inode *inode,
> +					 struct ext4_inode *raw_inode,
> +					 struct ext4_inode_info *ei)
> +{
> +	__le32 *magic = (void *)raw_inode +
> +			EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize;
> +	if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC))
> +		ext4_set_inode_state(inode, EXT4_STATE_XATTR);
> +}

The patch looks fine, and is a nice little cleanup, but...

> struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> {
> 	struct ext4_iloc iloc;
> @@ -3720,13 +3730,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> 			/* The extra space is currently unused. Use it. */
> 			ei->i_extra_isize = sizeof(struct ext4_inode) -
> 					    EXT4_GOOD_OLD_INODE_SIZE;
> -		} else {
> -			__le32 *magic = (void *)raw_inode +
> -					EXT4_GOOD_OLD_INODE_SIZE +
> -					ei->i_extra_isize;
> -			if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC))
> -				ext4_set_inode_state(inode, EXT4_STATE_XATTR);
> -		}
> +		} else
> +			ext4_iget_extra_inode(inode, raw_inode, ei);

This does not follow Documentation/CodingStyle - there should be braces around
the "else" clause if it is needed for the "if" clause.  The below code could be
fixed at the same time.

> 	} else
> 		ei->i_extra_isize = 0;
> 
> -- 
> 1.7.0.4
> 
> --
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Cheers, Andreas





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