linux-kernel - RE: [f2fs-dev] [PATCH 2/6] f2fs: convert inline_data for punch

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Date:	Tue, 31 Dec 2013 14:08:24 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Jaegeuk Kim' <jaegeuk.kim@...sung.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [f2fs-dev] [PATCH 2/6] f2fs: convert inline_data for punch_hole

Hi,

One comment as following.

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk.kim@...sung.com]
> Sent: Friday, December 27, 2013 12:00 PM
> Cc: linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org; linux-f2fs-devel@...ts.sourceforge.net
> Subject: [f2fs-dev] [PATCH 2/6] f2fs: convert inline_data for punch_hole
> 
> In the punch_hole(), let's convert inline_data all the time for simplicity and
> to avoid potential deadlock conditions.
> It is pretty much not a big deal to do this.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>

Reviewed-by: Chao Yu <chao2.yu@...sung.com>

> ---
>  fs/f2fs/file.c | 22 +++-------------------
>  1 file changed, 3 insertions(+), 19 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 7ef2d6a..f64a1c8 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -462,25 +462,9 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
>  	loff_t off_start, off_end;
>  	int ret = 0;
> 
> -	if (f2fs_has_inline_data(inode)) {
> -		struct page *page;
> -		unsigned flags = AOP_FLAG_NOFS;
> -		page = grab_cache_page_write_begin(inode->i_mapping, 0, flags);
> -		if (IS_ERR(page))
> -			return PTR_ERR(page);

We use following code because grab_cache_page_write_begin only use
NULL value as its error number.

	if (!page)
		return -ENOMEM;

> -		if (offset + len > MAX_INLINE_DATA) {
> -			ret = f2fs_convert_inline_data(inode, page, flags);
> -			f2fs_put_page(page, 1);
> -			if (ret)
> -				return ret;
> -		} else {
> -			zero_user_segment(page, offset, offset + len);
> -			SetPageUptodate(page);
> -			set_page_dirty(page);
> -			f2fs_put_page(page, 1);
> -			return ret;
> -		}
> -	}
> +	ret = f2fs_convert_inline_data(inode, NULL, AOP_FLAG_NOFS);
> +	if (ret)
> +		return ret;
> 
>  	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
>  	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
> --
> 1.8.4.474.g128a96c
> 
> 
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