Re: [PATCH 3.15 2/2] f2fs: check bdi->dirty_exceeded when trying to skip data writes

[Greg KH <greg@kroah.com>]

On Mon, Jul 14, 2014 at 07:52:51AM -0700, Jaegeuk Kim wrote:
> commit dd6b9bf5883c3ca9c17bac80ccd8615fe5a452a3 upstream.

You mean 2743f865543c0c4a5e12fc13edb2bf89a6e9687c, right?

thanks,

greg k-h

> 
> If we don't check the current backing device status, balance_dirty_pages can
> fall into infinite pausing routine.
> 
> This can be occurred when a lot of directories make a small number of dirty
> dentry pages including files.
> 
> Reported-by: Brian Chadwick <brianchad@westnet.com.au>
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
>  fs/f2fs/node.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index a9c0495..5696bde 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -42,6 +42,8 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
>  		mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >> 12;
>  		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
>  	} else if (type == DIRTY_DENTS) {
> +		if (sbi->sb->s_bdi->dirty_exceeded)
> +			return false;
>  		mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
>  		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 1);
>  	}
> -- 
> 2.0.1.472.g6f92e5f
> 
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