[Cluster-devel] [GFS2 PATCH] GFS2: Change truncate page allocation to be GFP_NOFS

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

Now in the -nmw tree, just making the merge window this time,

Steve.

On Mon, 2012-03-19 at 15:25 -0400, Bob Peterson wrote:
> Hi,
> 
> This patch changes the page allocation in gfs2_block_truncate_page
> and two others to GFP_NOFS to avoid deadlock in low-memory conditions.
> 
> Regards,
> 
> Bob Peterson
> Red Hat File Systems
> 
> Signed-off-by: Bob Peterson <rpeterso@redhat.com> 
> --
> diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
> index 14a7040..197c5c4 100644
> --- a/fs/gfs2/bmap.c
> +++ b/fs/gfs2/bmap.c
> @@ -60,7 +60,7 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
>  	int release = 0;
>  
>  	if (!page || page->index) {
> -		page = grab_cache_page(inode->i_mapping, 0);
> +		page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
>  		if (!page)
>  			return -ENOMEM;
>  		release = 1;
> @@ -930,7 +930,7 @@ static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
>  	struct page *page;
>  	int err;
>  
> -	page = grab_cache_page(mapping, index);
> +	page = find_or_create_page(mapping, index, GFP_NOFS);
>  	if (!page)
>  		return 0;
>  
> diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
> index a45b21b..4856c66 100644
> --- a/fs/gfs2/quota.c
> +++ b/fs/gfs2/quota.c
> @@ -681,7 +681,7 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
>  	ptr = qp;
>  	nbytes = sizeof(struct gfs2_quota);
>  get_a_page:
> -	page = grab_cache_page(mapping, index);
> +	page = find_or_create_page(mapping, index, GFP_NOFS);
>  	if (!page)
>  		return -ENOMEM;
>  
>