stack_o2cb.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0-only
/*
 * stack_o2cb.c
 *
 * Code which interfaces ocfs2 with the o2cb stack.
 *
 * Copyright (C) 2007 Oracle.  All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/crc32.h>
#include <linux/slab.h>
#include <linux/module.h>

/* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
#include <linux/fs.h>

#include "cluster/masklog.h"
#include "cluster/nodemanager.h"
#include "cluster/heartbeat.h"
#include "cluster/tcp.h"

#include "stackglue.h"

struct o2dlm_private { … };

static struct ocfs2_stack_plugin o2cb_stack;

/* These should be identical */
#if (DLM_LOCK_IV != LKM_IVMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_NL != LKM_NLMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_CR != LKM_CRMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_CW != LKM_CWMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_PR != LKM_PRMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_PW != LKM_PWMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_EX != LKM_EXMODE)
# error Lock modes do not match
#endif
static inline int mode_to_o2dlm(int mode)
{ … }

static int flags_to_o2dlm(u32 flags)
{ … }

/*
 * Map an o2dlm status to standard errno values.
 *
 * o2dlm only uses a handful of these, and returns even fewer to the
 * caller. Still, we try to assign sane values to each error.
 *
 * The following value pairs have special meanings to dlmglue, thus
 * the right hand side needs to stay unique - never duplicate the
 * mapping elsewhere in the table!
 *
 * DLM_NORMAL:		0
 * DLM_NOTQUEUED:	-EAGAIN
 * DLM_CANCELGRANT:	-EBUSY
 * DLM_CANCEL:		-DLM_ECANCEL
 */
/* Keep in sync with dlmapi.h */
static int status_map[] = …;

static int dlm_status_to_errno(enum dlm_status status)
{ … }

static void o2dlm_lock_ast_wrapper(void *astarg)
{ … }

static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
{ … }

static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
{ … }

static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
			 int mode,
			 struct ocfs2_dlm_lksb *lksb,
			 u32 flags,
			 void *name,
			 unsigned int namelen)
{ … }

static int o2cb_dlm_unlock(struct ocfs2_cluster_connection *conn,
			   struct ocfs2_dlm_lksb *lksb,
			   u32 flags)
{ … }

static int o2cb_dlm_lock_status(struct ocfs2_dlm_lksb *lksb)
{ … }

/*
 * o2dlm aways has a "valid" LVB. If the dlm loses track of the LVB
 * contents, it will zero out the LVB.  Thus the caller can always trust
 * the contents.
 */
static int o2cb_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb)
{ … }

static void *o2cb_dlm_lvb(struct ocfs2_dlm_lksb *lksb)
{ … }

static void o2cb_dump_lksb(struct ocfs2_dlm_lksb *lksb)
{ … }

/*
 * Check if this node is heartbeating and is connected to all other
 * heartbeating nodes.
 */
static int o2cb_cluster_check(void)
{ … }

/*
 * Called from the dlm when it's about to evict a node. This is how the
 * classic stack signals node death.
 */
static void o2dlm_eviction_cb(int node_num, void *data)
{ … }

static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
{ … }

static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn)
{ … }

static int o2cb_cluster_this_node(struct ocfs2_cluster_connection *conn,
				  unsigned int *node)
{ … }

static const struct ocfs2_stack_operations o2cb_stack_ops = …;

static struct ocfs2_stack_plugin o2cb_stack = …;

static int __init o2cb_stack_init(void)
{ … }

static void __exit o2cb_stack_exit(void)
{ … }

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
module_init(…) …;
module_exit(o2cb_stack_exit);
linux/fs/ocfs2/stack_o2cb.c
