From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] add -o flush for fat
Date: Mon, 7 Aug 2006 16:58:20 -0700
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Cc: linux-fsdevel@vger.kernel.org,
	OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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To: Chris Mason <mason@suse.com>
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On Mon, 7 Aug 2006 16:23:55 -0400
Chris Mason <mason@suse.com> wrote:

> Fat is commonly used on removable media. Mounting with -o flush tells the
> FS to write things to disk as quickly as possible.  It is like -o sync, but
> much faster (and not as safe).
> 

OK, so it's now fat-specific.  That makes it easier, and still useful.

> @@ -112,6 +113,16 @@ int fat_generic_ioctl(struct inode *inod
>  	}
>  }
>  
> +static int fat_file_release(struct inode *inode, struct file *filp)
> +{
> +	if ((filp->f_mode & FMODE_WRITE) &&
> +	     MSDOS_SB(inode->i_sb)->options.flush) {
> +		fat_flush_inodes(inode->i_sb, inode, NULL);
> +		blk_congestion_wait(WRITE, HZ/10);
> +	}
> +	return 0;
> +}

What's the blk_congestion_wait() for?