linux/fs/dlm/dlm_internal.h
David Teigland 38aa8b0c59 [DLM] fix old rcom messages
A reply to a recovery message will often be received after the relevant
recovery sequence has aborted and the next recovery sequence has begun.
We need to ignore replies to these old messages from the previous
recovery.  There's already a way to do this for synchronous recovery
requests using the rc_id number, but not for async.

Each recovery sequence already has a locally unique sequence number
associated with it.  This patch adds a field to the rcom (recovery
message) structure where this recovery sequence number can be placed,
rc_seq.  When a node sends a reply to a recovery request, it copies the
rc_seq number it received into rc_seq_reply.  When the first node receives
the reply to its recovery message, it will check whether rc_seq_reply
matches the current recovery sequence number, ls_recover_seq, and if not
then it ignores the old reply.

An old, inadequate approach to filtering out old replies (checking if the
current stage of recovery has moved back to the start) has been removed
from two spots.

The protocol version number is changed to reflect the different rcom
structures.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-02-05 13:35:50 -05:00

548 lines
14 KiB
C

/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
** of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#ifndef __DLM_INTERNAL_DOT_H__
#define __DLM_INTERNAL_DOT_H__
/*
* This is the main header file to be included in each DLM source file.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/delay.h>
#include <linux/socket.h>
#include <linux/kthread.h>
#include <linux/kobject.h>
#include <linux/kref.h>
#include <linux/kernel.h>
#include <linux/jhash.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <linux/dlm.h>
#define DLM_LOCKSPACE_LEN 64
/* Size of the temp buffer midcomms allocates on the stack.
We try to make this large enough so most messages fit.
FIXME: should sctp make this unnecessary? */
#define DLM_INBUF_LEN 148
struct dlm_ls;
struct dlm_lkb;
struct dlm_rsb;
struct dlm_member;
struct dlm_lkbtable;
struct dlm_rsbtable;
struct dlm_dirtable;
struct dlm_direntry;
struct dlm_recover;
struct dlm_header;
struct dlm_message;
struct dlm_rcom;
struct dlm_mhandle;
#define log_print(fmt, args...) \
printk(KERN_ERR "dlm: "fmt"\n" , ##args)
#define log_error(ls, fmt, args...) \
printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
#define DLM_LOG_DEBUG
#ifdef DLM_LOG_DEBUG
#define log_debug(ls, fmt, args...) log_error(ls, fmt, ##args)
#else
#define log_debug(ls, fmt, args...)
#endif
#define DLM_ASSERT(x, do) \
{ \
if (!(x)) \
{ \
printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
"DLM: assertion: \"%s\"\n" \
"DLM: time = %lu\n", \
__LINE__, __FILE__, #x, jiffies); \
{do} \
printk("\n"); \
BUG(); \
panic("DLM: Record message above and reboot.\n"); \
} \
}
#define DLM_FAKE_USER_AST ERR_PTR(-EINVAL)
struct dlm_direntry {
struct list_head list;
uint32_t master_nodeid;
uint16_t length;
char name[1];
};
struct dlm_dirtable {
struct list_head list;
rwlock_t lock;
};
struct dlm_rsbtable {
struct list_head list;
struct list_head toss;
rwlock_t lock;
};
struct dlm_lkbtable {
struct list_head list;
rwlock_t lock;
uint16_t counter;
};
/*
* Lockspace member (per node in a ls)
*/
struct dlm_member {
struct list_head list;
int nodeid;
int weight;
};
/*
* Save and manage recovery state for a lockspace.
*/
struct dlm_recover {
struct list_head list;
int *nodeids;
int node_count;
uint64_t seq;
};
/*
* Pass input args to second stage locking function.
*/
struct dlm_args {
uint32_t flags;
void *astaddr;
long astparam;
void *bastaddr;
int mode;
struct dlm_lksb *lksb;
};
/*
* Lock block
*
* A lock can be one of three types:
*
* local copy lock is mastered locally
* (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
* process copy lock is mastered on a remote node
* (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
* master copy master node's copy of a lock owned by remote node
* (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
*
* lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
* dlm_unlock. The dlm does not modify these or use any private flags in
* this field; it only contains DLM_LKF_ flags from dlm.h. These flags
* are sent as-is to the remote master when the lock is remote.
*
* lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
* Some internal flags are shared between the master and process nodes;
* these shared flags are kept in the lower two bytes. One of these
* flags set on the master copy will be propagated to the process copy
* and v.v. Other internal flags are private to the master or process
* node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
*
* lkb_sbflags: status block flags. These flags are copied directly into
* the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
* ast. All defined in dlm.h with DLM_SBF_ prefix.
*
* lkb_status: the lock status indicates which rsb queue the lock is
* on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
*
* lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
* reply is needed. Only set when the lkb is on the lockspace waiters
* list awaiting a reply from a remote node.
*
* lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
* is a master copy, nodeid specifies the remote lock holder, when the
* lkb is a process copy, the nodeid specifies the lock master.
*/
/* lkb_ast_type */
#define AST_COMP 1
#define AST_BAST 2
/* lkb_status */
#define DLM_LKSTS_WAITING 1
#define DLM_LKSTS_GRANTED 2
#define DLM_LKSTS_CONVERT 3
/* lkb_flags */
#define DLM_IFL_MSTCPY 0x00010000
#define DLM_IFL_RESEND 0x00020000
#define DLM_IFL_DEAD 0x00040000
#define DLM_IFL_USER 0x00000001
#define DLM_IFL_ORPHAN 0x00000002
struct dlm_lkb {
struct dlm_rsb *lkb_resource; /* the rsb */
struct kref lkb_ref;
int lkb_nodeid; /* copied from rsb */
int lkb_ownpid; /* pid of lock owner */
uint32_t lkb_id; /* our lock ID */
uint32_t lkb_remid; /* lock ID on remote partner */
uint32_t lkb_exflags; /* external flags from caller */
uint32_t lkb_sbflags; /* lksb flags */
uint32_t lkb_flags; /* internal flags */
uint32_t lkb_lvbseq; /* lvb sequence number */
int8_t lkb_status; /* granted, waiting, convert */
int8_t lkb_rqmode; /* requested lock mode */
int8_t lkb_grmode; /* granted lock mode */
int8_t lkb_bastmode; /* requested mode */
int8_t lkb_highbast; /* highest mode bast sent for */
int8_t lkb_wait_type; /* type of reply waiting for */
int8_t lkb_ast_type; /* type of ast queued for */
struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
struct list_head lkb_statequeue; /* rsb g/c/w list */
struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
struct list_head lkb_wait_reply; /* waiting for remote reply */
struct list_head lkb_astqueue; /* need ast to be sent */
struct list_head lkb_ownqueue; /* list of locks for a process */
char *lkb_lvbptr;
struct dlm_lksb *lkb_lksb; /* caller's status block */
void *lkb_astaddr; /* caller's ast function */
void *lkb_bastaddr; /* caller's bast function */
long lkb_astparam; /* caller's ast arg */
};
struct dlm_rsb {
struct dlm_ls *res_ls; /* the lockspace */
struct kref res_ref;
struct mutex res_mutex;
unsigned long res_flags;
int res_length; /* length of rsb name */
int res_nodeid;
uint32_t res_lvbseq;
uint32_t res_hash;
uint32_t res_bucket; /* rsbtbl */
unsigned long res_toss_time;
uint32_t res_first_lkid;
struct list_head res_lookup; /* lkbs waiting on first */
struct list_head res_hashchain; /* rsbtbl */
struct list_head res_grantqueue;
struct list_head res_convertqueue;
struct list_head res_waitqueue;
struct list_head res_root_list; /* used for recovery */
struct list_head res_recover_list; /* used for recovery */
int res_recover_locks_count;
char *res_lvbptr;
char res_name[1];
};
/* find_rsb() flags */
#define R_MASTER 1 /* only return rsb if it's a master */
#define R_CREATE 2 /* create/add rsb if not found */
/* rsb_flags */
enum rsb_flags {
RSB_MASTER_UNCERTAIN,
RSB_VALNOTVALID,
RSB_VALNOTVALID_PREV,
RSB_NEW_MASTER,
RSB_NEW_MASTER2,
RSB_RECOVER_CONVERT,
RSB_LOCKS_PURGED,
};
static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
{
__set_bit(flag, &r->res_flags);
}
static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
{
__clear_bit(flag, &r->res_flags);
}
static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
{
return test_bit(flag, &r->res_flags);
}
/* dlm_header is first element of all structs sent between nodes */
#define DLM_HEADER_MAJOR 0x00030000
#define DLM_HEADER_MINOR 0x00000000
#define DLM_MSG 1
#define DLM_RCOM 2
struct dlm_header {
uint32_t h_version;
uint32_t h_lockspace;
uint32_t h_nodeid; /* nodeid of sender */
uint16_t h_length;
uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
uint8_t h_pad;
};
#define DLM_MSG_REQUEST 1
#define DLM_MSG_CONVERT 2
#define DLM_MSG_UNLOCK 3
#define DLM_MSG_CANCEL 4
#define DLM_MSG_REQUEST_REPLY 5
#define DLM_MSG_CONVERT_REPLY 6
#define DLM_MSG_UNLOCK_REPLY 7
#define DLM_MSG_CANCEL_REPLY 8
#define DLM_MSG_GRANT 9
#define DLM_MSG_BAST 10
#define DLM_MSG_LOOKUP 11
#define DLM_MSG_REMOVE 12
#define DLM_MSG_LOOKUP_REPLY 13
struct dlm_message {
struct dlm_header m_header;
uint32_t m_type; /* DLM_MSG_ */
uint32_t m_nodeid;
uint32_t m_pid;
uint32_t m_lkid; /* lkid on sender */
uint32_t m_remid; /* lkid on receiver */
uint32_t m_parent_lkid;
uint32_t m_parent_remid;
uint32_t m_exflags;
uint32_t m_sbflags;
uint32_t m_flags;
uint32_t m_lvbseq;
uint32_t m_hash;
int m_status;
int m_grmode;
int m_rqmode;
int m_bastmode;
int m_asts;
int m_result; /* 0 or -EXXX */
char m_extra[0]; /* name or lvb */
};
#define DLM_RS_NODES 0x00000001
#define DLM_RS_NODES_ALL 0x00000002
#define DLM_RS_DIR 0x00000004
#define DLM_RS_DIR_ALL 0x00000008
#define DLM_RS_LOCKS 0x00000010
#define DLM_RS_LOCKS_ALL 0x00000020
#define DLM_RS_DONE 0x00000040
#define DLM_RS_DONE_ALL 0x00000080
#define DLM_RCOM_STATUS 1
#define DLM_RCOM_NAMES 2
#define DLM_RCOM_LOOKUP 3
#define DLM_RCOM_LOCK 4
#define DLM_RCOM_STATUS_REPLY 5
#define DLM_RCOM_NAMES_REPLY 6
#define DLM_RCOM_LOOKUP_REPLY 7
#define DLM_RCOM_LOCK_REPLY 8
struct dlm_rcom {
struct dlm_header rc_header;
uint32_t rc_type; /* DLM_RCOM_ */
int rc_result; /* multi-purpose */
uint64_t rc_id; /* match reply with request */
uint64_t rc_seq; /* sender's ls_recover_seq */
uint64_t rc_seq_reply; /* remote ls_recover_seq */
char rc_buf[0];
};
struct rcom_config {
uint32_t rf_lvblen;
uint32_t rf_lsflags;
uint64_t rf_unused;
};
struct rcom_lock {
uint32_t rl_ownpid;
uint32_t rl_lkid;
uint32_t rl_remid;
uint32_t rl_parent_lkid;
uint32_t rl_parent_remid;
uint32_t rl_exflags;
uint32_t rl_flags;
uint32_t rl_lvbseq;
int rl_result;
int8_t rl_rqmode;
int8_t rl_grmode;
int8_t rl_status;
int8_t rl_asts;
uint16_t rl_wait_type;
uint16_t rl_namelen;
char rl_name[DLM_RESNAME_MAXLEN];
char rl_lvb[0];
};
struct dlm_ls {
struct list_head ls_list; /* list of lockspaces */
dlm_lockspace_t *ls_local_handle;
uint32_t ls_global_id; /* global unique lockspace ID */
uint32_t ls_exflags;
int ls_lvblen;
int ls_count; /* reference count */
unsigned long ls_flags; /* LSFL_ */
struct kobject ls_kobj;
struct dlm_rsbtable *ls_rsbtbl;
uint32_t ls_rsbtbl_size;
struct dlm_lkbtable *ls_lkbtbl;
uint32_t ls_lkbtbl_size;
struct dlm_dirtable *ls_dirtbl;
uint32_t ls_dirtbl_size;
struct mutex ls_waiters_mutex;
struct list_head ls_waiters; /* lkbs needing a reply */
struct list_head ls_nodes; /* current nodes in ls */
struct list_head ls_nodes_gone; /* dead node list, recovery */
int ls_num_nodes; /* number of nodes in ls */
int ls_low_nodeid;
int ls_total_weight;
int *ls_node_array;
struct dlm_rsb ls_stub_rsb; /* for returning errors */
struct dlm_lkb ls_stub_lkb; /* for returning errors */
struct dlm_message ls_stub_ms; /* for faking a reply */
struct dentry *ls_debug_rsb_dentry; /* debugfs */
struct dentry *ls_debug_waiters_dentry; /* debugfs */
wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
int ls_uevent_result;
struct miscdevice ls_device;
/* recovery related */
struct timer_list ls_timer;
struct task_struct *ls_recoverd_task;
struct mutex ls_recoverd_active;
spinlock_t ls_recover_lock;
uint32_t ls_recover_status; /* DLM_RS_ */
uint64_t ls_recover_seq;
struct dlm_recover *ls_recover_args;
struct rw_semaphore ls_in_recovery; /* block local requests */
struct list_head ls_requestqueue;/* queue remote requests */
struct mutex ls_requestqueue_mutex;
char *ls_recover_buf;
int ls_recover_nodeid; /* for debugging */
uint64_t ls_rcom_seq;
spinlock_t ls_rcom_spin;
struct list_head ls_recover_list;
spinlock_t ls_recover_list_lock;
int ls_recover_list_count;
wait_queue_head_t ls_wait_general;
struct mutex ls_clear_proc_locks;
struct list_head ls_root_list; /* root resources */
struct rw_semaphore ls_root_sem; /* protect root_list */
int ls_namelen;
char ls_name[1];
};
#define LSFL_WORK 0
#define LSFL_RUNNING 1
#define LSFL_RECOVERY_STOP 2
#define LSFL_RCOM_READY 3
#define LSFL_RCOM_WAIT 4
#define LSFL_UEVENT_WAIT 5
/* much of this is just saving user space pointers associated with the
lock that we pass back to the user lib with an ast */
struct dlm_user_args {
struct dlm_user_proc *proc; /* each process that opens the lockspace
device has private data
(dlm_user_proc) on the struct file,
the process's locks point back to it*/
struct dlm_lksb lksb;
int old_mode;
int update_user_lvb;
struct dlm_lksb __user *user_lksb;
void __user *castparam;
void __user *castaddr;
void __user *bastparam;
void __user *bastaddr;
};
#define DLM_PROC_FLAGS_CLOSING 1
#define DLM_PROC_FLAGS_COMPAT 2
/* locks list is kept so we can remove all a process's locks when it
exits (or orphan those that are persistent) */
struct dlm_user_proc {
dlm_lockspace_t *lockspace;
unsigned long flags; /* DLM_PROC_FLAGS */
struct list_head asts;
spinlock_t asts_spin;
struct list_head locks;
spinlock_t locks_spin;
wait_queue_head_t wait;
};
static inline int dlm_locking_stopped(struct dlm_ls *ls)
{
return !test_bit(LSFL_RUNNING, &ls->ls_flags);
}
static inline int dlm_recovery_stopped(struct dlm_ls *ls)
{
return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
}
static inline int dlm_no_directory(struct dlm_ls *ls)
{
return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0;
}
#endif /* __DLM_INTERNAL_DOT_H__ */