linux-kernel - Re: [PATCH V4 2/2] fs/ext4/fsync.c: generic_file

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Date:	Mon, 12 May 2014 11:24:26 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, jack <jack@...e.cz>,
	hch <hch@...radead.org>, Viro <viro@...iv.linux.org.uk>,
	tytso <tytso@....edu>, akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH V4 2/2] fs/ext4/fsync.c: generic_file_fsync call based on
 barrier flag

On Sun, May 11, 2014 at 1:06 AM, Fabian Frederick <fabf@...net.be> wrote:
> generic_file_fsync has been updated to issue a flush for
> older filesystems.
>
> This patch tests for barrier flag in ext4 mount flags
> and calls the right function.
>
> Suggested-by: Jan Kara <jack@...e.cz>
> Suggested-by: Christoph Hellwig <hch@...radead.org>
> Cc: Jan Kara <jack@...e.cz>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: "Theodore Ts'o" <tytso@....edu>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  fs/ext4/fsync.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
> index a8bc47f..fa82c0a 100644
> --- a/fs/ext4/fsync.c
> +++ b/fs/ext4/fsync.c
> @@ -108,6 +108,10 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
>
>         if (!journal) {
>                 ret = generic_file_fsync(file, start, end, datasync);

Forget to remove above line?

> +               if (test_opt(inode->i_sb, BARRIER))
> +                       ret = generic_file_fsync(file, start, end, datasync);
> +               else
> +                       ret = __generic_file_fsync(file, start, end, datasync);
>                 if (!ret && !hlist_empty(&inode->i_dentry))
>                         ret = ext4_sync_parent(inode);
>                 goto out;



Thanks,
-- 
Ming Lei
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