[Ocfs2-devel] [PATCH 1/3] ocfs2:freeze-thaw: add freeze cluster lock

[Sunil Mushran <sunil.mushran@oracle.com>]

Wengang Wang wrote:
> add cluster lock for freeze/thaw.
> change dlm version from 1.0 to 1.1
>
> Authored-by: Tiger Yang <tiger.yang@oracle.com>
> Authored-by: Wengang Wang <wen.gang.wang@oracle.com>
> Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
>   

Removed Authored by tags. Just note that these patches
were originally authored by Tiger.

> diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
> index 0334000..6e8bcb6 100644
> --- a/fs/ocfs2/dlm/dlmdomain.c
> +++ b/fs/ocfs2/dlm/dlmdomain.c
> @@ -128,10 +128,14 @@ static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
>   * will have a negotiated version with the same major number and a minor
>   * number equal or smaller.  The dlm_ctxt->dlm_locking_proto field should
>   * be used to determine what a running domain is actually using.
> + *
> + * dlm protocal history:
> + * 1.0:	base
> + * 1.1:	freeze lock support added
>   */
>  static const struct dlm_protocol_version dlm_protocol = {
>  	.pv_major = 1,
> -	.pv_minor = 0,
> +	.pv_minor = 1,
>  };
>   

Sorry. I told you to change the dlm protocol. But it should
be the fs protocol as we are adding a new lock type. We would
change the dlm protocol if were were adding a new dlm message
type, etc.

Same change. Up the minor by one.

>  
>  #define DLM_DOMAIN_BACKOFF_MS 200
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index c5e4a49..0caa69e 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -2894,6 +2894,34 @@ static const struct file_operations ocfs2_dlm_debug_fops = {
>  	.llseek =	seq_lseek,
>  };
>  
> +int ocfs2_freeze_lock(struct ocfs2_super *osb, int ex)
> +{
> +	int ret;
> +	int level = ex ? LKM_EXMODE : LKM_PRMODE;
> +	struct ocfs2_lock_res *lockres = &osb->osb_freeze_lockres;
> +
> +	if (ocfs2_is_hard_readonly(osb))
> +		return -EROFS;
> +
> +	if (ocfs2_mount_local(osb))
> +		return 0;
> +
> +	ret = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
> +	if (ret < 0)
> +		mlog_errno(ret);
> +
> +	return ret;
> +}
> +
> +void ocfs2_freeze_unlock(struct ocfs2_super *osb, int ex)
> +{
> +	int level = ex ? LKM_EXMODE : LKM_PRMODE;
> +	struct ocfs2_lock_res *lockres = &osb->osb_freeze_lockres;
> +
> +	if (!ocfs2_mount_local(osb))
> +		ocfs2_cluster_unlock(osb, lockres, level);
> +}
> +
>  static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
>  {
>  	int ret = 0;
> diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
> index d1ce48e..8687b81 100644
> --- a/fs/ocfs2/dlmglue.h
> +++ b/fs/ocfs2/dlmglue.h
> @@ -155,6 +155,8 @@ struct ocfs2_refcount_tree;
>  int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
>  void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
>  
> +int ocfs2_freeze_lock(struct ocfs2_super *osb, int ex);
> +void ocfs2_freeze_unlock(struct ocfs2_super *osb, int ex);
>  
>  void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
>  void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
> diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
> index d963d86..bf66978 100644
> --- a/fs/ocfs2/ocfs2.h
> +++ b/fs/ocfs2/ocfs2.h
> @@ -355,6 +355,7 @@ struct ocfs2_super
>  	struct ocfs2_lock_res osb_super_lockres;
>  	struct ocfs2_lock_res osb_rename_lockres;
>  	struct ocfs2_lock_res osb_nfs_sync_lockres;
> +	struct ocfs2_lock_res osb_freeze_lockres;
>  	struct ocfs2_dlm_debug *osb_dlm_debug;
>  
>  	struct dentry *osb_debug_root;
> diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
> index d277aab..3c29924 100644
> --- a/fs/ocfs2/ocfs2_lockid.h
> +++ b/fs/ocfs2/ocfs2_lockid.h
> @@ -50,6 +50,7 @@ enum ocfs2_lock_type {
>  	OCFS2_LOCK_TYPE_NFS_SYNC,
>  	OCFS2_LOCK_TYPE_ORPHAN_SCAN,
>  	OCFS2_LOCK_TYPE_REFCOUNT,
> +	OCFS2_LOCK_TYPE_FREEZE,
>  	OCFS2_NUM_LOCK_TYPES
>  };
>   

OCFS2_LOCK_TYPE_FREEZEFS sounds better.

> @@ -93,6 +94,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
>  		case OCFS2_LOCK_TYPE_REFCOUNT:
>  			c = 'T';
>  			break;
> +		case OCFS2_LOCK_TYPE_FREEZE:
> +			c = 'Z';
> +			break;
>  		default:
>  			c = '\0';
>  	}
> @@ -115,6 +119,7 @@ static char *ocfs2_lock_type_strings[] = {
>  	[OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
>  	[OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
>  	[OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
> +	[OCFS2_LOCK_TYPE_FREEZE] = "Freeze",
>  };
>  
>  static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
>