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Date:	Tue, 19 Aug 2008 11:29:18 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Code cleanups


在 2008-08-19二的 12:18 +0530,Aneesh Kumar K.V写道:
> a) rename num to nrblocks to clearly indicate we expecting block count as argument.
> b) renmae ext4_writepages_trans_blocks to ext4_da_writepages_trans_blocks to
> indicate it is the delayed allocation writepages transaction credit.
> c) Add some comments. remove some stale comments.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Acked-by: Mingming Cao <cmm@...ibm.com>
> ---
>  fs/ext4/extents.c |    8 ++++----
>  fs/ext4/inode.c   |   14 ++++++++------
>  2 files changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 73bb308..bf612a7 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -1893,7 +1893,7 @@ static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
>   * When pass the actual path, the caller should calculate credits
>   * under i_data_sem.
>   */
> -int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int num,
> +int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks,
>  						struct ext4_ext_path *path)
>  {
>  	if (path) {
> @@ -1912,12 +1912,12 @@ int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int num,
>  			 *  and other metadat blocks still need to be
>  			 *  accounted.
>  			 */
> -			/* 1 one bitmap, 1 block group descriptor */
> +			/* 1 bitmap, 1 block group descriptor */
>  			ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb);
>  		}
>  	}
> 
> -	return ext4_chunk_trans_blocks(inode, num);
> +	return ext4_chunk_trans_blocks(inode, nrblocks);
>  }
> 
>  /*
> @@ -1931,7 +1931,7 @@ int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int num,
>   * If the nrblocks are discontiguous, they could cause
>   * the whole tree split more than once, but this is really rare.
>   */
> -int ext4_ext_index_trans_blocks(struct inode *inode, int num, int chunk)
> +int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk)
>  {
>  	int index;
>  	int depth = ext_depth(inode);
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index a10f8e5..b32a723 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2321,16 +2321,18 @@ static int ext4_da_writepage(struct page *page,
>   * a single extent allocation into a single transaction,
>   * ext4_da_writpeages() will loop calling this before
>   * the block allocation.
> - *
> - * The page vector size limited the max number of pages could
> - * be writeout at a time. Based on this, the max blocks to pass to
> - * get_block is calculated
>   */
> 
> -static int ext4_writepages_trans_blocks(struct inode *inode)
> +static int ext4_da_writepages_trans_blocks(struct inode *inode)
>  {
>  	int max_blocks = EXT4_I(inode)->i_reserved_data_blocks;
> 
> +	/*
> +	 * With noextent format the journal credit needed to
> +	 * insert nrblocks contiguous block is dependent on
> +	 * number of contiguous block. So we will limit
> +	 * number of contiguous block to a sane value
> +	 */
>  	if (!(inode->i_flags & EXT4_EXTENTS_FL) &&
>  	    (max_blocks > EXT4_MAX_TRANS_DATA))
>  		max_blocks = EXT4_MAX_TRANS_DATA;
> @@ -2387,7 +2389,7 @@ static int ext4_da_writepages(struct address_space *mapping,
>  		 * by delalloc
>  		 */
>  		BUG_ON(ext4_should_journal_data(inode));
> -		needed_blocks = ext4_writepages_trans_blocks(inode);
> +		needed_blocks = ext4_da_writepages_trans_blocks(inode);
> 
>  		/* start a new transaction*/
>  		handle = ext4_journal_start(inode, needed_blocks);

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