linux-kernel - RE: [f2fs-dev] [PATCH 1/2] f2fs: handle error cases in move_encrypted

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Date:	Wed, 15 Jul 2015 09:39:47 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [f2fs-dev] [PATCH 1/2] f2fs: handle error cases in
	move_encrypted_block

Hi Jaegeuk,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Wednesday, July 15, 2015 3:18 AM
> To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> linux-f2fs-devel@...ts.sourceforge.net
> Cc: Jaegeuk Kim
> Subject: [f2fs-dev] [PATCH 1/2] f2fs: handle error cases in move_encrypted_block
> 
> This patch fixes some missing error handlers.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/gc.c | 25 ++++++++++++++++---------
>  1 file changed, 16 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 11046db..db11861 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -556,27 +556,34 @@ static void move_encrypted_block(struct inode *inode, block_t bidx)
>  	if (!fio.encrypted_page)
>  		goto put_out;
> 
> -	f2fs_submit_page_bio(&fio);
> -
> -	/* allocate block address */
> -	f2fs_wait_on_page_writeback(dn.node_page, NODE);
> -
> -	allocate_data_block(fio.sbi, NULL, fio.blk_addr,
> -					&fio.blk_addr, &sum, CURSEG_COLD_DATA);
> -	dn.data_blkaddr = fio.blk_addr;
> +	err = f2fs_submit_page_bio(&fio);
> +	if (err)
> +		goto put_page_out;

f2fs_submit_page_bio will put the page when failed.

So goto put_out is enough?

> 
>  	/* write page */
>  	lock_page(fio.encrypted_page);
> +
> +	if (unlikely(!PageUptodate(fio.encrypted_page)))
> +		goto put_page_out;
> +	if (unlikely(fio.encrypted_page->mapping != META_MAPPING(fio.sbi)))
> +		goto put_page_out;
> +
>  	set_page_writeback(fio.encrypted_page);
>  	fio.rw = WRITE_SYNC;
>  	f2fs_submit_page_mbio(&fio);
> 
> +	/* allocate block address */
> +	f2fs_wait_on_page_writeback(dn.node_page, NODE);
> +	allocate_data_block(fio.sbi, NULL, fio.blk_addr,
> +					&fio.blk_addr, &sum, CURSEG_COLD_DATA);

move above f2fs_submit_page_mbio(&fio) to here?

Thanks,

> +	dn.data_blkaddr = fio.blk_addr;
> +
>  	set_data_blkaddr(&dn);
>  	f2fs_update_extent_cache(&dn);
>  	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
>  	if (page->index == 0)
>  		set_inode_flag(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
> -
> +put_page_out:
>  	f2fs_put_page(fio.encrypted_page, 1);
>  put_out:
>  	f2fs_put_dnode(&dn);
> --
> 2.1.1
> 
> 
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