294 lines
8.7 KiB
C
294 lines
8.7 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
|
/*
|
||
|
|
* stackglue.h
|
||
|
|
*
|
||
|
|
* Glue to the underlying cluster stack.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef STACKGLUE_H
|
||
|
|
#define STACKGLUE_H
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/list.h>
|
||
|
|
#include <linux/dlmconstants.h>
|
||
|
|
|
||
|
|
#include "dlm/dlmapi.h"
|
||
|
|
#include <linux/dlm.h>
|
||
|
|
|
||
|
|
/* Needed for plock-related prototypes */
|
||
|
|
struct file;
|
||
|
|
struct file_lock;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dlmconstants.h does not have a LOCAL flag. We hope to remove it
|
||
|
|
* some day, but right now we need it. Let's fake it. This value is larger
|
||
|
|
* than any flag in dlmconstants.h.
|
||
|
|
*/
|
||
|
|
#define DLM_LKF_LOCAL 0x00100000
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This shadows DLM_LOCKSPACE_LEN in fs/dlm/dlm_internal.h. That probably
|
||
|
|
* wants to be in a public header.
|
||
|
|
*/
|
||
|
|
#define GROUP_NAME_MAX 64
|
||
|
|
|
||
|
|
/* This shadows OCFS2_CLUSTER_NAME_LEN */
|
||
|
|
#define CLUSTER_NAME_MAX 16
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ocfs2_protocol_version changes when ocfs2 does something different in
|
||
|
|
* its inter-node behavior. See dlmglue.c for more information.
|
||
|
|
*/
|
||
|
|
struct ocfs2_protocol_version {
|
||
|
|
u8 pv_major;
|
||
|
|
u8 pv_minor;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The dlm_lockstatus struct includes lvb space, but the dlm_lksb struct only
|
||
|
|
* has a pointer to separately allocated lvb space. This struct exists only to
|
||
|
|
* include in the lksb union to make space for a combined dlm_lksb and lvb.
|
||
|
|
*/
|
||
|
|
struct fsdlm_lksb_plus_lvb {
|
||
|
|
struct dlm_lksb lksb;
|
||
|
|
char lvb[DLM_LVB_LEN];
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* A union of all lock status structures. We define it here so that the
|
||
|
|
* size of the union is known. Lock status structures are embedded in
|
||
|
|
* ocfs2 inodes.
|
||
|
|
*/
|
||
|
|
struct ocfs2_cluster_connection;
|
||
|
|
struct ocfs2_dlm_lksb {
|
||
|
|
union {
|
||
|
|
struct dlm_lockstatus lksb_o2dlm;
|
||
|
|
struct dlm_lksb lksb_fsdlm;
|
||
|
|
struct fsdlm_lksb_plus_lvb padding;
|
||
|
|
};
|
||
|
|
struct ocfs2_cluster_connection *lksb_conn;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The ocfs2_locking_protocol defines the handlers called on ocfs2's behalf.
|
||
|
|
*/
|
||
|
|
struct ocfs2_locking_protocol {
|
||
|
|
struct ocfs2_protocol_version lp_max_version;
|
||
|
|
void (*lp_lock_ast)(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
void (*lp_blocking_ast)(struct ocfs2_dlm_lksb *lksb, int level);
|
||
|
|
void (*lp_unlock_ast)(struct ocfs2_dlm_lksb *lksb, int error);
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* A cluster connection. Mostly opaque to ocfs2, the connection holds
|
||
|
|
* state for the underlying stack. ocfs2 does use cc_version to determine
|
||
|
|
* locking compatibility.
|
||
|
|
*/
|
||
|
|
struct ocfs2_cluster_connection {
|
||
|
|
char cc_name[GROUP_NAME_MAX + 1];
|
||
|
|
int cc_namelen;
|
||
|
|
char cc_cluster_name[CLUSTER_NAME_MAX + 1];
|
||
|
|
int cc_cluster_name_len;
|
||
|
|
struct ocfs2_protocol_version cc_version;
|
||
|
|
struct ocfs2_locking_protocol *cc_proto;
|
||
|
|
void (*cc_recovery_handler)(int node_num, void *recovery_data);
|
||
|
|
void *cc_recovery_data;
|
||
|
|
void *cc_lockspace;
|
||
|
|
void *cc_private;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Each cluster stack implements the stack operations structure. Not used
|
||
|
|
* in the ocfs2 code, the stackglue code translates generic cluster calls
|
||
|
|
* into stack operations.
|
||
|
|
*/
|
||
|
|
struct ocfs2_stack_operations {
|
||
|
|
/*
|
||
|
|
* The fs code calls ocfs2_cluster_connect() to attach a new
|
||
|
|
* filesystem to the cluster stack. The ->connect() op is passed
|
||
|
|
* an ocfs2_cluster_connection with the name and recovery field
|
||
|
|
* filled in.
|
||
|
|
*
|
||
|
|
* The stack must set up any notification mechanisms and create
|
||
|
|
* the filesystem lockspace in the DLM. The lockspace should be
|
||
|
|
* stored on cc_lockspace. Any other information can be stored on
|
||
|
|
* cc_private.
|
||
|
|
*
|
||
|
|
* ->connect() must not return until it is guaranteed that
|
||
|
|
*
|
||
|
|
* - Node down notifications for the filesystem will be received
|
||
|
|
* and passed to conn->cc_recovery_handler().
|
||
|
|
* - Locking requests for the filesystem will be processed.
|
||
|
|
*/
|
||
|
|
int (*connect)(struct ocfs2_cluster_connection *conn);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The fs code calls ocfs2_cluster_disconnect() when a filesystem
|
||
|
|
* no longer needs cluster services. All DLM locks have been
|
||
|
|
* dropped, and recovery notification is being ignored by the
|
||
|
|
* fs code. The stack must disengage from the DLM and discontinue
|
||
|
|
* recovery notification.
|
||
|
|
*
|
||
|
|
* Once ->disconnect() has returned, the connection structure will
|
||
|
|
* be freed. Thus, a stack must not return from ->disconnect()
|
||
|
|
* until it will no longer reference the conn pointer.
|
||
|
|
*
|
||
|
|
* Once this call returns, the stack glue will be dropping this
|
||
|
|
* connection's reference on the module.
|
||
|
|
*/
|
||
|
|
int (*disconnect)(struct ocfs2_cluster_connection *conn);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* ->this_node() returns the cluster's unique identifier for the
|
||
|
|
* local node.
|
||
|
|
*/
|
||
|
|
int (*this_node)(struct ocfs2_cluster_connection *conn,
|
||
|
|
unsigned int *node);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Call the underlying dlm lock function. The ->dlm_lock()
|
||
|
|
* callback should convert the flags and mode as appropriate.
|
||
|
|
*
|
||
|
|
* ast and bast functions are not part of the call because the
|
||
|
|
* stack will likely want to wrap ast and bast calls before passing
|
||
|
|
* them to stack->sp_proto. There is no astarg. The lksb will
|
||
|
|
* be passed back to the ast and bast functions. The caller can
|
||
|
|
* use this to find their object.
|
||
|
|
*/
|
||
|
|
int (*dlm_lock)(struct ocfs2_cluster_connection *conn,
|
||
|
|
int mode,
|
||
|
|
struct ocfs2_dlm_lksb *lksb,
|
||
|
|
u32 flags,
|
||
|
|
void *name,
|
||
|
|
unsigned int namelen);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Call the underlying dlm unlock function. The ->dlm_unlock()
|
||
|
|
* function should convert the flags as appropriate.
|
||
|
|
*
|
||
|
|
* The unlock ast is not passed, as the stack will want to wrap
|
||
|
|
* it before calling stack->sp_proto->lp_unlock_ast(). There is
|
||
|
|
* no astarg. The lksb will be passed back to the unlock ast
|
||
|
|
* function. The caller can use this to find their object.
|
||
|
|
*/
|
||
|
|
int (*dlm_unlock)(struct ocfs2_cluster_connection *conn,
|
||
|
|
struct ocfs2_dlm_lksb *lksb,
|
||
|
|
u32 flags);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Return the status of the current lock status block. The fs
|
||
|
|
* code should never dereference the union. The ->lock_status()
|
||
|
|
* callback pulls out the stack-specific lksb, converts the status
|
||
|
|
* to a proper errno, and returns it.
|
||
|
|
*/
|
||
|
|
int (*lock_status)(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Return non-zero if the LVB is valid.
|
||
|
|
*/
|
||
|
|
int (*lvb_valid)(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Pull the lvb pointer off of the stack-specific lksb.
|
||
|
|
*/
|
||
|
|
void *(*lock_lvb)(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Cluster-aware posix locks
|
||
|
|
*
|
||
|
|
* This is NULL for stacks which do not support posix locks.
|
||
|
|
*/
|
||
|
|
int (*plock)(struct ocfs2_cluster_connection *conn,
|
||
|
|
u64 ino,
|
||
|
|
struct file *file,
|
||
|
|
int cmd,
|
||
|
|
struct file_lock *fl);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is an optoinal debugging hook. If provided, the
|
||
|
|
* stack can dump debugging information about this lock.
|
||
|
|
*/
|
||
|
|
void (*dump_lksb)(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Each stack plugin must describe itself by registering a
|
||
|
|
* ocfs2_stack_plugin structure. This is only seen by stackglue and the
|
||
|
|
* stack driver.
|
||
|
|
*/
|
||
|
|
struct ocfs2_stack_plugin {
|
||
|
|
char *sp_name;
|
||
|
|
struct ocfs2_stack_operations *sp_ops;
|
||
|
|
struct module *sp_owner;
|
||
|
|
|
||
|
|
/* These are managed by the stackglue code. */
|
||
|
|
struct list_head sp_list;
|
||
|
|
unsigned int sp_count;
|
||
|
|
struct ocfs2_protocol_version sp_max_proto;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/* Used by the filesystem */
|
||
|
|
int ocfs2_cluster_connect(const char *stack_name,
|
||
|
|
const char *cluster_name,
|
||
|
|
int cluster_name_len,
|
||
|
|
const char *group,
|
||
|
|
int grouplen,
|
||
|
|
struct ocfs2_locking_protocol *lproto,
|
||
|
|
void (*recovery_handler)(int node_num,
|
||
|
|
void *recovery_data),
|
||
|
|
void *recovery_data,
|
||
|
|
struct ocfs2_cluster_connection **conn);
|
||
|
|
/*
|
||
|
|
* Used by callers that don't store their stack name. They must ensure
|
||
|
|
* all nodes have the same stack.
|
||
|
|
*/
|
||
|
|
int ocfs2_cluster_connect_agnostic(const char *group,
|
||
|
|
int grouplen,
|
||
|
|
struct ocfs2_locking_protocol *lproto,
|
||
|
|
void (*recovery_handler)(int node_num,
|
||
|
|
void *recovery_data),
|
||
|
|
void *recovery_data,
|
||
|
|
struct ocfs2_cluster_connection **conn);
|
||
|
|
int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
|
||
|
|
int hangup_pending);
|
||
|
|
void ocfs2_cluster_hangup(const char *group, int grouplen);
|
||
|
|
int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn,
|
||
|
|
unsigned int *node);
|
||
|
|
|
||
|
|
struct ocfs2_lock_res;
|
||
|
|
int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
|
||
|
|
int mode,
|
||
|
|
struct ocfs2_dlm_lksb *lksb,
|
||
|
|
u32 flags,
|
||
|
|
void *name,
|
||
|
|
unsigned int namelen);
|
||
|
|
int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
|
||
|
|
struct ocfs2_dlm_lksb *lksb,
|
||
|
|
u32 flags);
|
||
|
|
|
||
|
|
int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb);
|
||
|
|
|
||
|
|
int ocfs2_stack_supports_plocks(void);
|
||
|
|
int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
|
||
|
|
struct file *file, int cmd, struct file_lock *fl);
|
||
|
|
|
||
|
|
void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto);
|
||
|
|
|
||
|
|
|
||
|
|
/* Used by stack plugins */
|
||
|
|
int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin);
|
||
|
|
void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin);
|
||
|
|
|
||
|
|
extern struct kset *ocfs2_kset;
|
||
|
|
|
||
|
|
#endif /* STACKGLUE_H */
|