[Cluster-devel] [GFS2 PATCH] GFS2: Get a block reservation before resizing a file

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

Now in the -nmw tree. Thanks,

Steve.

On Fri, 2013-02-01 at 12:03 -0500, Bob Peterson wrote:
> Hi,
> 
> This patch allocates a block reservation structure before growing 
> or shrinking a file. Without this structure, the grow or shink code
> can reference the bad pointer.
> 
> Regards,
> 
> Bob Peterson
> Red Hat File Systems
> 
> Signed-off-by: Bob Peterson <rpeterso@redhat.com> 
> ---
>  fs/gfs2/bmap.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
> index d29d779..df686d1 100644
> --- a/fs/gfs2/bmap.c
> +++ b/fs/gfs2/bmap.c
> @@ -1288,6 +1288,10 @@ int gfs2_setattr_size(struct inode *inode, u64 newsize)
>  
>  	inode_dio_wait(inode);
>  
> +	ret = gfs2_rs_alloc(GFS2_I(inode));
> +	if (ret)
> +		return ret;
> +
>  	oldsize = inode->i_size;
>  	if (newsize >= oldsize)
>  		return do_grow(inode, newsize);
>