[Cluster-devel] [PATCH] GFS2: fix recursive locking during rindex truncates

[Steven Whitehouse]

Hi,

Now in the -nmw git tree. Thanks,

Steve.

On Tue, 2010-11-23 at 23:52 -0600, Benjamin Marzinski wrote:
> When you truncate the rindex file, you need to avoid calling gfs2_rindex_hold,
> since you already hold it.  However, if you haven't already read in the
> resource groups, you need to do that.
> 
> Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
> ---
>  fs/gfs2/bmap.c |    9 +++++++--
>  fs/gfs2/rgrp.c |    2 +-
>  fs/gfs2/rgrp.h |    1 +
>  3 files changed, 9 insertions(+), 3 deletions(-)
> 
> Index: gfs2-2.6-nmw/fs/gfs2/bmap.c
> ===================================================================
> --- gfs2-2.6-nmw.orig/fs/gfs2/bmap.c
> +++ gfs2-2.6-nmw/fs/gfs2/bmap.c
> @@ -780,7 +780,11 @@ static int do_strip(struct gfs2_inode *i
>  	if (metadata)
>  		revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
>  
> -	error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
> +	if (ip != GFS2_I(sdp->sd_rindex))
> +		error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
> +	else if (!sdp->sd_rgrps)
> +		error = gfs2_ri_update(ip);
> +
>  	if (error)
>  		return error;
>  
> @@ -879,7 +883,8 @@ out_rg_gunlock:
>  out_rlist:
>  	gfs2_rlist_free(&rlist);
>  out:
> -	gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
> +	if (ip != GFS2_I(sdp->sd_rindex))
> +		gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
>  	return error;
>  }
>  
> Index: gfs2-2.6-nmw/fs/gfs2/rgrp.c
> ===================================================================
> --- gfs2-2.6-nmw.orig/fs/gfs2/rgrp.c
> +++ gfs2-2.6-nmw/fs/gfs2/rgrp.c
> @@ -583,7 +583,7 @@ static int read_rindex_entry(struct gfs2
>   * Returns: 0 on successful update, error code otherwise
>   */
>  
> -static int gfs2_ri_update(struct gfs2_inode *ip)
> +int gfs2_ri_update(struct gfs2_inode *ip)
>  {
>  	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
>  	struct inode *inode = &ip->i_inode;
> Index: gfs2-2.6-nmw/fs/gfs2/rgrp.h
> ===================================================================
> --- gfs2-2.6-nmw.orig/fs/gfs2/rgrp.h
> +++ gfs2-2.6-nmw/fs/gfs2/rgrp.h
> @@ -46,6 +46,7 @@ gfs2_inplace_reserve_i((ip), __FILE__, _
>  
>  extern void gfs2_inplace_release(struct gfs2_inode *ip);
>  
> +extern int gfs2_ri_update(struct gfs2_inode *ip);
>  extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n);
>  extern int gfs2_alloc_di(struct gfs2_inode *ip, u64 *bn, u64 *generation);
>  
>