linux-ext4 - Re: [PATCH] ext4: Remove blocks from inode prealloc list on failure

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Date:	Fri, 4 Dec 2009 15:16:55 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Curt Wohlgemuth <curtw@...gle.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: Remove blocks from inode prealloc list on failure

On Tue, Dec 01, 2009 at 10:17:02AM -0800, Curt Wohlgemuth wrote:
> This fixes a leak of blocks in an inode prealloc list if device failures
> cause ext4_mb_mark_diskspace_used() to fail.
> 
> Signed-off-by: Curt Wohlgemuth <curtw@...gle.com>
> ---
> diff -uprN orig/fs/ext4/mballoc.c new/fs/ext4/mballoc.c
> --- orig/fs/ext4/mballoc.c	2009-12-01 09:27:25.000000000 -0800
> +++ new/fs/ext4/mballoc.c	2009-12-01 09:28:38.000000000 -0800
> @@ -3011,6 +3011,22 @@ static void ext4_mb_collect_stats(struct
>  }
> 
>  /*
> + * Called on failure; free up any blocks from the inode PA for this
> + * context.
> + */
> +static void ext4_discard_inode_pa(struct ext4_allocation_context *ac)
> +{
> +	struct ext4_prealloc_space *pa = ac->ac_pa;
> +	int len;
> +
> +	if (pa && pa->pa_type == MB_INODE_PA) {
> +		len = ac->ac_b_ex.fe_len;
> +		pa->pa_free += len;
> +	}
> +
> +}

Can you name it as discard allocated blocks and add a comment saying why
we don't need it for MB_GROUP_PA ? Otherwise

Acked-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>


> +
> +/*
>   * use blocks preallocated to inode
>   */
>  static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
> @@ -4295,6 +4311,7 @@ repeat:
>  			ac->ac_status = AC_STATUS_CONTINUE;
>  			goto repeat;
>  		} else if (*errp) {
> +			ext4_discard_inode_pa(ac);
>  			ac->ac_b_ex.fe_len = 0;
>  			ar->len = 0;
>  			ext4_mb_show_ac(ac);
> --
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