linux-ext4 - Re: [PATCH] ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc

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Date:	Thu, 04 Dec 2008 10:19:29 -0800
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: Fix s_dirty_blocks_counter if block allocation
	failed with nodelalloc


在 2008-12-04四的 19:34 +0530，Aneesh Kumar K.V写道：
> With nodelalloc option we need to update the dirty block counter on
> block allocation failure. This is needed because we increment the
> dirty block counter early in the block allocation phase. Without
> the patch s_dirty_blocks_counter goes wrong so that filesystem's
> free blocks decreases incorrectly.
> 

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

> Tested-by: Akira Fujita <a-fujita@...jp.nec.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  fs/ext4/mballoc.c |    9 ++++++++-
>  1 files changed, 8 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index bacc2f4..22d31c3 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -4550,7 +4550,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
>  	}
>  	if (ar->len == 0) {
>  		*errp = -EDQUOT;
> -		return 0;
> +		goto out3;
>  	}
>  	inquota = ar->len;
> 
> @@ -4623,6 +4623,13 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
>  out1:
>  	if (ar->len < inquota)
>  		DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
> +out3:
> +	if (!ar->len) {
> +		if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag)
> +			/* release all the reserved blocks if non delalloc */
> +			percpu_counter_sub(&sbi->s_dirtyblocks_counter,
> +						reserv_blks);
> +	}
> 
>  	return block;
>  }

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