[Cluster-devel] [GFS2 PATCH] gfs2: fix bad inode i_goal values during block allocation

[Steven Whitehouse]

Hi,

Now in the -nmw git tree. Thanks,

Steve.

On 19/09/14 03:40, Abhi Das wrote:
> This patch checks if i_goal is either zero or if doesn't exist
> within any rgrp (i.e gfs2_blk2rgrpd() returns NULL). If so, it
> assigns the ip->i_no_addr block as the i_goal.
>
> There are two scenarios where a bad i_goal can result in a
> -EBADSLT error.
>
> 1. Attempting to allocate to an existing inode:
> Control reaches gfs2_inplace_reserve() and ip->i_goal is bad.
> We need to fix i_goal here.
>
> 2. A new inode is created in a directory whose i_goal is hosed:
> In this case, the parent dir's i_goal is copied onto the new
> inode. Since the new inode is not yet created, the ip->i_no_addr
> field is invalid and so, the fix in gfs2_inplace_reserve() as per
> 1) won't work in this scenario. We need to catch and fix it sooner
> in the parent dir itself (gfs2_create_inode()), before it is
> copied to the new inode.
>
> Signed-off-by: Abhi Das <adas at redhat.com>
> ---
>   fs/gfs2/inode.c | 1 +
>   fs/gfs2/rgrp.c  | 8 ++++++++
>   fs/gfs2/rgrp.h  | 1 +
>   3 files changed, 10 insertions(+)
>
> diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
> index fc8ac2e..9516f5c 100644
> --- a/fs/gfs2/inode.c
> +++ b/fs/gfs2/inode.c
> @@ -672,6 +672,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
>   	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
>   	gfs2_set_inode_blocks(inode, 1);
>   	munge_mode_uid_gid(dip, inode);
> +	check_and_update_goal(dip);
>   	ip->i_goal = dip->i_goal;
>   	ip->i_diskflags = 0;
>   	ip->i_eattr = 0;
> diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
> index f4cb9c0..55ef72d 100644
> --- a/fs/gfs2/rgrp.c
> +++ b/fs/gfs2/rgrp.c
> @@ -577,6 +577,13 @@ struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
>   	return rgd;
>   }
>   
> +void check_and_update_goal(struct gfs2_inode *ip)
> +{
> +	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
> +	if (!ip->i_goal || gfs2_blk2rgrpd(sdp, ip->i_goal, 1) == NULL)
> +		ip->i_goal = ip->i_no_addr;
> +}
> +
>   void gfs2_free_clones(struct gfs2_rgrpd *rgd)
>   {
>   	int x;
> @@ -1910,6 +1917,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *a
>   	} else if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal)) {
>   		rs->rs_rbm.rgd = begin = ip->i_rgd;
>   	} else {
> +		check_and_update_goal(ip);
>   		rs->rs_rbm.rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
>   	}
>   	if (S_ISDIR(ip->i_inode.i_mode) && (ap->aflags & GFS2_AF_ORLOV))
> diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
> index 463ab2e..5d8f085 100644
> --- a/fs/gfs2/rgrp.h
> +++ b/fs/gfs2/rgrp.h
> @@ -80,4 +80,5 @@ static inline bool gfs2_rs_active(struct gfs2_blkreserv *rs)
>   	return rs && !RB_EMPTY_NODE(&rs->rs_node);
>   }
>   
> +extern void check_and_update_goal(struct gfs2_inode *ip);
>   #endif /* __RGRP_DOT_H__ */