linux-kernel - Re: [PATCH v2 4/5] fat: fallback to buffered write in case of fallocatded region on direct IO

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Date:	Sun, 01 Dec 2013 21:50:03 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v2 4/5] fat: fallback to buffered write in case of fallocatded region on direct IO

Namjae Jeon <linkinjeon@...il.com> writes:

> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index 12a37a9..c9fb9b6 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -217,6 +217,14 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
>  		loff_t size = offset + iov_iter_count(iter);
>  		if (MSDOS_I(inode)->mmu_private < size)
>  			return 0;
> +
> +		/*
> +		 * In case of writing in fallocated region, return 0 and
> +		 * fallback to buffered write.
> +		 */
> +		if (MSDOS_I(inode)->i_disksize >
> +		    round_up(i_size_read(inode), inode->i_sb->s_blocksize))
> +			return 0;

->mmu_private works instead of i_size?
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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