linux-ext4 - Re: [PATCH 1/2] merge ext4_claim_free_blocks & ext4_has_free

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Message-Id: <1224881138.6379.5.camel@mingming-laptop>
Date:	Fri, 24 Oct 2008 13:45:38 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH 1/2] merge ext4_claim_free_blocks & ext4_has_free_blocks


在 2008-10-24五的 15:27 -0500，Eric Sandeen写道：
> Mingming pointed out that ext4_claim_free_blocks & ext4_has_free_blocks
> are largely cut & pasted; they can be collapsed/merged as follows.
> 
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>
> ---
> 

Reviewed-by: Mingming Cao <cmm@...ibm.com>

> Index: linux-2.6/fs/ext4/balloc.c
> ===================================================================
> --- linux-2.6.orig/fs/ext4/balloc.c	2008-10-24 15:04:51.672001367 -0500
> +++ linux-2.6/fs/ext4/balloc.c	2008-10-24 15:07:28.369001684 -0500
> @@ -589,8 +589,15 @@ void ext4_free_blocks(handle_t *handle, 
>  	return;
>  }
> 
> -int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> -						s64 nblocks)
> +/**
> + * ext4_has_free_blocks()
> + * @sbi:	in-core super block structure.
> + * @nblocks:	number of needed blocks
> + *
> + * Check if filesystem has nblocks free & available for allocation.
> + * On success return 1, return 0 on failure.
> + */
> +int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
>  {
>  	s64 free_blocks, dirty_blocks;
>  	s64 root_blocks = 0;
> @@ -620,53 +627,21 @@ int ext4_claim_free_blocks(struct ext4_s
>  	 */
>  	if (free_blocks < ((root_blocks + nblocks) + dirty_blocks))
>  		/* we don't have free space */
> -		return -ENOSPC;
> +		return 0;
> 
> -	/* Add the blocks to nblocks */
> -	percpu_counter_add(dbc, nblocks);
> -	return 0;
> +	return 1;
>  }
> 
> -/**
> - * ext4_has_free_blocks()
> - * @sbi:	in-core super block structure.
> - * @nblocks:	number of neeed blocks
> - *
> - * Check if filesystem has free blocks available for allocation.
> - * Return the number of blocks avaible for allocation for this request
> - * On success, return nblocks
> - */
> -ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> +int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
>  						s64 nblocks)
>  {
> -	s64 free_blocks, dirty_blocks;
> -	s64 root_blocks = 0;
> -	struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
> -	struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
> -
> -	free_blocks  = percpu_counter_read_positive(fbc);
> -	dirty_blocks = percpu_counter_read_positive(dbc);
> -
> -	if (!capable(CAP_SYS_RESOURCE) &&
> -		sbi->s_resuid != current->fsuid &&
> -		(sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
> -		root_blocks = ext4_r_blocks_count(sbi->s_es);
> -
> -	if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
> -						EXT4_FREEBLOCKS_WATERMARK) {
> -		free_blocks  = percpu_counter_sum(fbc);
> -		dirty_blocks = percpu_counter_sum(dbc);
> -	}
> -	if (free_blocks <= (root_blocks + dirty_blocks))
> -		/* we don't have free space */
> +	if (ext4_has_free_blocks(sbi, nblocks)) {
> +		percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks);
>  		return 0;
> -
> -	if (free_blocks - (root_blocks + dirty_blocks) < nblocks)
> -		return free_blocks - (root_blocks + dirty_blocks);
> -	return nblocks;
> +	} else
> +		return -ENOSPC;
>  }
> 
> -
>  /**
>   * ext4_should_retry_alloc()
>   * @sb:			super block
> Index: linux-2.6/fs/ext4/ext4.h
> ===================================================================
> --- linux-2.6.orig/fs/ext4/ext4.h	2008-10-24 14:45:07.000000000 -0500
> +++ linux-2.6/fs/ext4/ext4.h	2008-10-24 15:05:22.227064688 -0500
> @@ -1003,8 +1003,7 @@ extern ext4_fsblk_t ext4_new_blocks(hand
>  					ext4_lblk_t iblock, ext4_fsblk_t goal,
>  					unsigned long *count, int *errp);
>  extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
> -extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> -					 s64 nblocks);
> +extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
>  extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
>  			ext4_fsblk_t block, unsigned long count, int metadata);
>  extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
> 
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