[Ocfs2-devel] [PATCH 7/7] Don't allow cluster_stack changes if FS are mounted
Joel Becker
jlbec at evilplan.org
Fri Sep 27 12:04:14 PDT 2013
I thought we already prevented this. Why a new mechanism?
Joel
On Fri, Sep 27, 2013 at 12:10:11PM -0500, Goldwyn Rodrigues wrote:
> ---
> fs/ocfs2/dlmglue.c | 3 ++-
> fs/ocfs2/stackglue.c | 18 ++++++++++++++++++
> fs/ocfs2/stackglue.h | 3 +++
> 3 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index f2d48c8..65b4280 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -3023,7 +3023,7 @@ local:
> ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb);
>
> osb->cconn = conn;
> -
> + ocfs2_inc_mount_count();
> status = 0;
> bail:
> if (status < 0) {
> @@ -3058,6 +3058,7 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
>
> ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
> osb->cconn = NULL;
> + ocfs2_dec_mount_count();
>
> ocfs2_dlm_shutdown_debug(osb);
> }
> diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
> index 4dd732b..e352a2e 100644
> --- a/fs/ocfs2/stackglue.c
> +++ b/fs/ocfs2/stackglue.c
> @@ -41,6 +41,7 @@ static DEFINE_SPINLOCK(ocfs2_stack_lock);
> static LIST_HEAD(ocfs2_stack_list);
> static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
> static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
> +static atomic_t mount_count = ATOMIC_INIT(0);
>
> /*
> * The stack currently in use. If not null, active_stack->sp_count > 0,
> @@ -417,6 +418,18 @@ int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
> }
> EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect);
>
> +void ocfs2_inc_mount_count()
> +{
> + atomic_inc(&mount_count);
> +}
> +EXPORT_SYMBOL_GPL(ocfs2_inc_mount_count);
> +
> +void ocfs2_dec_mount_count()
> +{
> + atomic_dec(&mount_count);
> +}
> +EXPORT_SYMBOL_GPL(ocfs2_dec_mount_count);
> +
> /*
> * Leave the group for this filesystem. This is executed by a userspace
> * program (stored in ocfs2_hb_ctl_path).
> @@ -569,6 +582,11 @@ static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj,
> size_t len = count;
> ssize_t ret;
>
> + if (atomic_read(&mount_count) > 0) {
> + printk(KERN_NOTICE "ocfs2_stackglue: Cannot set cluster_stack when filesystems are mounted.\n");
> + return -EINVAL;
> + }
> +
> if (len == 0)
> return len;
>
> diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h
> index d3a54df..da4a913 100644
> --- a/fs/ocfs2/stackglue.h
> +++ b/fs/ocfs2/stackglue.h
> @@ -293,6 +293,9 @@ int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
>
> void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto);
>
> +void ocfs2_inc_mount_count(void);
> +void ocfs2_dec_mount_count(void);
> +
>
> /* Used by stack plugins */
> int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin);
> --
> 1.8.1.4
>
>
> --
> Goldwyn
>
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> Ocfs2-devel at oss.oracle.com
> https://oss.oracle.com/mailman/listinfo/ocfs2-devel
--
"To fall in love is to create a religion that has a fallible god."
-Jorge Luis Borges
http://www.jlbec.org/
jlbec at evilplan.org
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