Re: [PATCH 13/19] gfs2: Convert to new freezing mechanism

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

On Thu, 2012-03-29 at 01:43 +0200, Jan Kara wrote:
> It is enough to update gfs2_page_mkwrite() to use new freeze protection.
> Rest is handled by the generic code.
> 
> CC: cluster-devel@redhat.com
> CC: Steven Whitehouse <swhiteho@redhat.com>
> Signed-off-by: Jan Kara <jack@suse.cz>

I think that looks ok to me...

Acked-by: Steven Whitehouse <swhiteho@redhat.com>

Steve.

> ---
>  fs/gfs2/file.c |   15 +++------------
>  1 files changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
> index 1f03531..806b7a4 100644
> --- a/fs/gfs2/file.c
> +++ b/fs/gfs2/file.c
> @@ -369,11 +369,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
>  	loff_t size;
>  	int ret;
>  
> -	/* Wait if fs is frozen. This is racy so we check again later on
> -	 * and retry if the fs has been frozen after the page lock has
> -	 * been acquired
> -	 */
> -	vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
> +	sb_start_pagefault(inode->i_sb);
>  
>  	/* Update file times before taking page lock */
>  	file_update_time(vma->vm_file);
> @@ -457,14 +453,9 @@ out:
>  	gfs2_holder_uninit(&gh);
>  	if (ret == 0) {
>  		set_page_dirty(page);
> -		/* This check must be post dropping of transaction lock */
> -		if (inode->i_sb->s_frozen == SB_UNFROZEN) {
> -			wait_on_page_writeback(page);
> -		} else {
> -			ret = -EAGAIN;
> -			unlock_page(page);
> -		}
> +		wait_on_page_writeback(page);
>  	}
> +	sb_end_pagefault(inode->i_sb);
>  	return block_page_mkwrite_return(ret);
>  }
>