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ocfs2: Break out stackglue into modules.

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We define the ocfs2_stack_plugin structure to represent a stack driver.
The o2cb stack code is split into stack_o2cb.c.  This becomes the
ocfs2_stack_o2cb.ko module.

The stackglue generic functions are similarly split into the
ocfs2_stackglue.ko module.  This module now provides an interface to
register drivers.  The ocfs2_stack_o2cb driver registers itself.  As
part of this interface, ocfs2_stackglue can load drivers on demand.
This is accomplished in ocfs2_cluster_connect().

ocfs2_cluster_disconnect() is now notified when a _hangup() is pending.
If a hangup is pending, it will not release the driver module and will
let _hangup() do that.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Joel Becker
2008-02-01 15:03:57 -08:00
committed by Mark Fasheh
parent e3dad42bf9
commit 286eaa95c5
7 changed files with 299 additions and 52 deletions
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41
fs/ocfs2/stack_o2cb.c
View File

@@ -18,7 +18,7 @@
*/
#include <linux/crc32.h>
#include <linux/kmod.h>
#include <linux/module.h>
/* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
#include <linux/fs.h>
@@ -33,6 +33,8 @@ struct o2dlm_private {
struct dlm_eviction_cb op_eviction_cb;
};
static struct ocfs2_stack_plugin o2cb_stack;
/* These should be identical */
#if (DLM_LOCK_IV != LKM_IVMODE)
# error Lock modes do not match
@@ -158,23 +160,23 @@ static int dlm_status_to_errno(enum dlm_status status)
static void o2dlm_lock_ast_wrapper(void *astarg)
{
BUG_ON(stack_glue_lproto == NULL);
BUG_ON(o2cb_stack.sp_proto == NULL);
stack_glue_lproto->lp_lock_ast(astarg);
o2cb_stack.sp_proto->lp_lock_ast(astarg);
}
static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
{
BUG_ON(stack_glue_lproto == NULL);
BUG_ON(o2cb_stack.sp_proto == NULL);
stack_glue_lproto->lp_blocking_ast(astarg, level);
o2cb_stack.sp_proto->lp_blocking_ast(astarg, level);
}
static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
{
int error = dlm_status_to_errno(status);
BUG_ON(stack_glue_lproto == NULL);
BUG_ON(o2cb_stack.sp_proto == NULL);
/*
* In o2dlm, you can get both the lock_ast() for the lock being
@@ -190,7 +192,7 @@ static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
if (status == DLM_CANCELGRANT)
return;
stack_glue_lproto->lp_unlock_ast(astarg, error);
o2cb_stack.sp_proto->lp_unlock_ast(astarg, error);
}
static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
@@ -267,6 +269,7 @@ static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
struct dlm_protocol_version dlm_version;
BUG_ON(conn == NULL);
BUG_ON(o2cb_stack.sp_proto == NULL);
/* for now we only have one cluster/node, make sure we see it
* in the heartbeat universe */
@@ -314,7 +317,8 @@ out:
return rc;
}
static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn)
static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn,
int hangup_pending)
{
struct dlm_ctxt *dlm = conn->cc_lockspace;
struct o2dlm_private *priv = conn->cc_private;
@@ -393,3 +397,24 @@ struct ocfs2_stack_operations o2cb_stack_ops = {
.dump_lksb = o2cb_dump_lksb,
};
static struct ocfs2_stack_plugin o2cb_stack = {
.sp_name = "o2cb",
.sp_ops = &o2cb_stack_ops,
.sp_owner = THIS_MODULE,
};
static int __init o2cb_stack_init(void)
{
return ocfs2_stack_glue_register(&o2cb_stack);
}
static void __exit o2cb_stack_exit(void)
{
ocfs2_stack_glue_unregister(&o2cb_stack);
}
MODULE_AUTHOR("Oracle");
MODULE_DESCRIPTION("ocfs2 driver for the classic o2cb stack");
MODULE_LICENSE("GPL");
module_init(o2cb_stack_init);
module_exit(o2cb_stack_exit);