linux-kernel - Re: [PATCH 1/2] befs: add flags field to validate superblock state

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Date:	Tue, 9 Aug 2016 16:29:13 +0100
From:	Luis de Bethencourt <luisbg@....samsung.com>
To:	Salah Triki <salah.triki@...il.com>, akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] befs: add flags field to validate superblock state

On 09/08/16 14:46, Salah Triki wrote:
> For validating superblock state, add flags field to befs_sb_info, read the state from the disk
> and check if it is equal to BEFS_DIRTY.
> 
> Signed-off-by: Salah Triki <salah.triki@...il.com>
> ---
>  fs/befs/befs.h  | 3 +++
>  fs/befs/super.c | 4 +++-
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/befs/befs.h b/fs/befs/befs.h
> index e0f59263a..511d16d 100644
> --- a/fs/befs/befs.h
> +++ b/fs/befs/befs.h
> @@ -43,6 +43,9 @@ struct befs_sb_info {
>  	u32 ag_shift;
>  	u32 num_ags;
>  
> +	/* State of the superblock */
> +	u32 flags;
> +
>  	/* jornal log entry */
>  	befs_block_run log_blocks;
>  	befs_off_t log_start;
> diff --git a/fs/befs/super.c b/fs/befs/super.c
> index aeafc4d..79be409 100644
> --- a/fs/befs/super.c
> +++ b/fs/befs/super.c
> @@ -45,6 +45,8 @@ befs_load_sb(struct super_block *sb, befs_super_block * disk_sb)
>  	befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
>  	befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);
>  
> +	befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags);
> +
>  	befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
>  	befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
>  	befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
> @@ -101,7 +103,7 @@ befs_check_sb(struct super_block *sb)
>  		return BEFS_ERR;
>  	}
>  
> -	if (befs_sb->log_start != befs_sb->log_end) {
> +	if (befs_sb->log_start != befs_sb->log_end || befs_sb->flags == BEFS_DIRTY) {
>  		befs_error(sb, "Filesystem not clean! There are blocks in the "
>  			   "journal. You must boot into BeOS and mount this volume "
>  			   "to make it clean.");
> 

Good catch.

Funny how the flags element had been added to the befs_super_block, but not to
befs_sb_info.

Thanks :)
Luis

Signed-off-by: Luis de Bethencourt <luisbg@....samsung.com>