linux-ext4 - Re: [PATCH -v2] ext4: respect the nobarrier mount option in nojournal mode

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Date:	Thu, 16 Jun 2016 20:07:37 +0200
From:	Jan Kara <jack@...e.cz>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH -v2] ext4: respect the nobarrier mount option in
 nojournal mode

On Fri 10-06-16 14:44:50, Ted Tso wrote:
> Also, if we are going to issue the barrier, we should do this after we
> write out the parent directories if necessary.
> 
> Signed-off-by: Theodore Ts'o <tytso@....edu>

The patch looks good. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/fsync.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
> index 8850254..5c43725 100644
> --- a/fs/ext4/fsync.c
> +++ b/fs/ext4/fsync.c
> @@ -106,9 +106,11 @@ 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);
> +		ret = __generic_file_fsync(file, start, end, datasync);
>  		if (!ret && !hlist_empty(&inode->i_dentry))
>  			ret = ext4_sync_parent(inode);
> +		if (test_opt(inode->i_sb, BARRIER))
> +			goto issue_flush;
>  		goto out;
>  	}
>  
> @@ -140,6 +142,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
>  		needs_barrier = true;
>  	ret = jbd2_complete_transaction(journal, commit_tid);
>  	if (needs_barrier) {
> +	issue_flush:
>  		err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
>  		if (!ret)
>  			ret = err;
> -- 
> 2.5.0
> 
> --
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-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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