599 lines
16 KiB
C
599 lines
16 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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** of the GNU General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
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#ifndef __DLM_INTERNAL_DOT_H__
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#define __DLM_INTERNAL_DOT_H__
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/*
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* This is the main header file to be included in each DLM source file.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/ctype.h>
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#include <linux/spinlock.h>
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#include <linux/vmalloc.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/random.h>
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#include <linux/delay.h>
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#include <linux/socket.h>
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#include <linux/kthread.h>
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#include <linux/kobject.h>
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#include <linux/kref.h>
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#include <linux/kernel.h>
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#include <linux/jhash.h>
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#include <linux/miscdevice.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <linux/dlm.h>
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#include "config.h"
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/* Size of the temp buffer midcomms allocates on the stack.
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We try to make this large enough so most messages fit.
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FIXME: should sctp make this unnecessary? */
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#define DLM_INBUF_LEN 148
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struct dlm_ls;
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struct dlm_lkb;
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struct dlm_rsb;
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struct dlm_member;
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struct dlm_lkbtable;
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struct dlm_rsbtable;
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struct dlm_dirtable;
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struct dlm_direntry;
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struct dlm_recover;
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struct dlm_header;
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struct dlm_message;
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struct dlm_rcom;
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struct dlm_mhandle;
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#define log_print(fmt, args...) \
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printk(KERN_ERR "dlm: "fmt"\n" , ##args)
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#define log_error(ls, fmt, args...) \
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printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
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#define log_debug(ls, fmt, args...) \
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do { \
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if (dlm_config.ci_log_debug) \
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printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
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(ls)->ls_name , ##args); \
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} while (0)
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#define DLM_ASSERT(x, do) \
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{ \
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if (!(x)) \
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{ \
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printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \
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"DLM: assertion: \"%s\"\n" \
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"DLM: time = %lu\n", \
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__LINE__, __FILE__, #x, jiffies); \
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{do} \
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printk("\n"); \
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BUG(); \
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panic("DLM: Record message above and reboot.\n"); \
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} \
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}
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struct dlm_direntry {
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struct list_head list;
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uint32_t master_nodeid;
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uint16_t length;
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char name[1];
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};
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struct dlm_dirtable {
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struct list_head list;
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rwlock_t lock;
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};
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struct dlm_rsbtable {
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struct list_head list;
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struct list_head toss;
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rwlock_t lock;
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};
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struct dlm_lkbtable {
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struct list_head list;
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rwlock_t lock;
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uint16_t counter;
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};
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/*
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* Lockspace member (per node in a ls)
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*/
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struct dlm_member {
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struct list_head list;
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int nodeid;
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int weight;
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};
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/*
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* Save and manage recovery state for a lockspace.
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*/
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struct dlm_recover {
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struct list_head list;
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int *nodeids; /* nodeids of all members */
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int node_count;
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int *new; /* nodeids of new members */
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int new_count;
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uint64_t seq;
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};
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/*
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* Pass input args to second stage locking function.
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*/
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struct dlm_args {
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uint32_t flags;
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void (*astfn) (void *astparam);
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void *astparam;
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void (*bastfn) (void *astparam, int mode);
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int mode;
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struct dlm_lksb *lksb;
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unsigned long timeout;
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};
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/*
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* Lock block
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*
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* A lock can be one of three types:
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*
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* local copy lock is mastered locally
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* (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
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* process copy lock is mastered on a remote node
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* (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
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* master copy master node's copy of a lock owned by remote node
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* (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
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*
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* lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
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* dlm_unlock. The dlm does not modify these or use any private flags in
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* this field; it only contains DLM_LKF_ flags from dlm.h. These flags
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* are sent as-is to the remote master when the lock is remote.
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*
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* lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
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* Some internal flags are shared between the master and process nodes;
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* these shared flags are kept in the lower two bytes. One of these
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* flags set on the master copy will be propagated to the process copy
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* and v.v. Other internal flags are private to the master or process
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* node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes.
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*
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* lkb_sbflags: status block flags. These flags are copied directly into
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* the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
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* ast. All defined in dlm.h with DLM_SBF_ prefix.
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*
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* lkb_status: the lock status indicates which rsb queue the lock is
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* on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT
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*
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* lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
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* reply is needed. Only set when the lkb is on the lockspace waiters
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* list awaiting a reply from a remote node.
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*
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* lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
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* is a master copy, nodeid specifies the remote lock holder, when the
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* lkb is a process copy, the nodeid specifies the lock master.
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*/
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/* lkb_ast_type */
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#define AST_COMP 1
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#define AST_BAST 2
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/* lkb_status */
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#define DLM_LKSTS_WAITING 1
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#define DLM_LKSTS_GRANTED 2
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#define DLM_LKSTS_CONVERT 3
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/* lkb_flags */
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#define DLM_IFL_MSTCPY 0x00010000
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#define DLM_IFL_RESEND 0x00020000
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#define DLM_IFL_DEAD 0x00040000
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#define DLM_IFL_OVERLAP_UNLOCK 0x00080000
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#define DLM_IFL_OVERLAP_CANCEL 0x00100000
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#define DLM_IFL_ENDOFLIFE 0x00200000
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#define DLM_IFL_WATCH_TIMEWARN 0x00400000
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#define DLM_IFL_TIMEOUT_CANCEL 0x00800000
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#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
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#define DLM_IFL_USER 0x00000001
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#define DLM_IFL_ORPHAN 0x00000002
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struct dlm_lkb {
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struct dlm_rsb *lkb_resource; /* the rsb */
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struct kref lkb_ref;
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int lkb_nodeid; /* copied from rsb */
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int lkb_ownpid; /* pid of lock owner */
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uint32_t lkb_id; /* our lock ID */
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uint32_t lkb_remid; /* lock ID on remote partner */
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uint32_t lkb_exflags; /* external flags from caller */
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uint32_t lkb_sbflags; /* lksb flags */
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uint32_t lkb_flags; /* internal flags */
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uint32_t lkb_lvbseq; /* lvb sequence number */
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int8_t lkb_status; /* granted, waiting, convert */
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int8_t lkb_rqmode; /* requested lock mode */
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int8_t lkb_grmode; /* granted lock mode */
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int8_t lkb_bastmode; /* requested mode */
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int8_t lkb_highbast; /* highest mode bast sent for */
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int8_t lkb_wait_type; /* type of reply waiting for */
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int8_t lkb_wait_count;
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int8_t lkb_ast_type; /* type of ast queued for */
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struct list_head lkb_idtbl_list; /* lockspace lkbtbl */
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struct list_head lkb_statequeue; /* rsb g/c/w list */
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struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */
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struct list_head lkb_wait_reply; /* waiting for remote reply */
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struct list_head lkb_astqueue; /* need ast to be sent */
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struct list_head lkb_ownqueue; /* list of locks for a process */
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struct list_head lkb_time_list;
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unsigned long lkb_timestamp;
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unsigned long lkb_timeout_cs;
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char *lkb_lvbptr;
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struct dlm_lksb *lkb_lksb; /* caller's status block */
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void (*lkb_astfn) (void *astparam);
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void (*lkb_bastfn) (void *astparam, int mode);
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union {
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void *lkb_astparam; /* caller's ast arg */
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struct dlm_user_args *lkb_ua;
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};
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};
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struct dlm_rsb {
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struct dlm_ls *res_ls; /* the lockspace */
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struct kref res_ref;
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struct mutex res_mutex;
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unsigned long res_flags;
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int res_length; /* length of rsb name */
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int res_nodeid;
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uint32_t res_lvbseq;
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uint32_t res_hash;
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uint32_t res_bucket; /* rsbtbl */
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unsigned long res_toss_time;
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uint32_t res_first_lkid;
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struct list_head res_lookup; /* lkbs waiting on first */
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struct list_head res_hashchain; /* rsbtbl */
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struct list_head res_grantqueue;
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struct list_head res_convertqueue;
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struct list_head res_waitqueue;
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struct list_head res_root_list; /* used for recovery */
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struct list_head res_recover_list; /* used for recovery */
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int res_recover_locks_count;
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char *res_lvbptr;
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char res_name[1];
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};
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/* find_rsb() flags */
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#define R_MASTER 1 /* only return rsb if it's a master */
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#define R_CREATE 2 /* create/add rsb if not found */
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/* rsb_flags */
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enum rsb_flags {
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RSB_MASTER_UNCERTAIN,
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RSB_VALNOTVALID,
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RSB_VALNOTVALID_PREV,
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RSB_NEW_MASTER,
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RSB_NEW_MASTER2,
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RSB_RECOVER_CONVERT,
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RSB_LOCKS_PURGED,
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};
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static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
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{
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__set_bit(flag, &r->res_flags);
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}
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static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
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{
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__clear_bit(flag, &r->res_flags);
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}
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static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
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{
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return test_bit(flag, &r->res_flags);
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}
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/* dlm_header is first element of all structs sent between nodes */
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#define DLM_HEADER_MAJOR 0x00030000
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#define DLM_HEADER_MINOR 0x00000000
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#define DLM_MSG 1
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#define DLM_RCOM 2
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struct dlm_header {
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uint32_t h_version;
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uint32_t h_lockspace;
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uint32_t h_nodeid; /* nodeid of sender */
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uint16_t h_length;
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uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */
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uint8_t h_pad;
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};
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#define DLM_MSG_REQUEST 1
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#define DLM_MSG_CONVERT 2
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#define DLM_MSG_UNLOCK 3
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#define DLM_MSG_CANCEL 4
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#define DLM_MSG_REQUEST_REPLY 5
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#define DLM_MSG_CONVERT_REPLY 6
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#define DLM_MSG_UNLOCK_REPLY 7
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#define DLM_MSG_CANCEL_REPLY 8
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#define DLM_MSG_GRANT 9
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#define DLM_MSG_BAST 10
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#define DLM_MSG_LOOKUP 11
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#define DLM_MSG_REMOVE 12
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#define DLM_MSG_LOOKUP_REPLY 13
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#define DLM_MSG_PURGE 14
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struct dlm_message {
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struct dlm_header m_header;
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uint32_t m_type; /* DLM_MSG_ */
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uint32_t m_nodeid;
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uint32_t m_pid;
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uint32_t m_lkid; /* lkid on sender */
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uint32_t m_remid; /* lkid on receiver */
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uint32_t m_parent_lkid;
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uint32_t m_parent_remid;
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uint32_t m_exflags;
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uint32_t m_sbflags;
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uint32_t m_flags;
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uint32_t m_lvbseq;
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uint32_t m_hash;
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int m_status;
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int m_grmode;
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int m_rqmode;
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int m_bastmode;
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int m_asts;
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int m_result; /* 0 or -EXXX */
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char m_extra[0]; /* name or lvb */
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};
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#define DLM_RS_NODES 0x00000001
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#define DLM_RS_NODES_ALL 0x00000002
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#define DLM_RS_DIR 0x00000004
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#define DLM_RS_DIR_ALL 0x00000008
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#define DLM_RS_LOCKS 0x00000010
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#define DLM_RS_LOCKS_ALL 0x00000020
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#define DLM_RS_DONE 0x00000040
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#define DLM_RS_DONE_ALL 0x00000080
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#define DLM_RCOM_STATUS 1
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#define DLM_RCOM_NAMES 2
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#define DLM_RCOM_LOOKUP 3
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#define DLM_RCOM_LOCK 4
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#define DLM_RCOM_STATUS_REPLY 5
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#define DLM_RCOM_NAMES_REPLY 6
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#define DLM_RCOM_LOOKUP_REPLY 7
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#define DLM_RCOM_LOCK_REPLY 8
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struct dlm_rcom {
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struct dlm_header rc_header;
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uint32_t rc_type; /* DLM_RCOM_ */
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int rc_result; /* multi-purpose */
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uint64_t rc_id; /* match reply with request */
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uint64_t rc_seq; /* sender's ls_recover_seq */
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uint64_t rc_seq_reply; /* remote ls_recover_seq */
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char rc_buf[0];
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};
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union dlm_packet {
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struct dlm_header header; /* common to other two */
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struct dlm_message message;
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struct dlm_rcom rcom;
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};
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struct rcom_config {
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__le32 rf_lvblen;
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__le32 rf_lsflags;
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__le64 rf_unused;
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};
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struct rcom_lock {
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__le32 rl_ownpid;
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__le32 rl_lkid;
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__le32 rl_remid;
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__le32 rl_parent_lkid;
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__le32 rl_parent_remid;
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__le32 rl_exflags;
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__le32 rl_flags;
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__le32 rl_lvbseq;
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__le32 rl_result;
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int8_t rl_rqmode;
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int8_t rl_grmode;
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int8_t rl_status;
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int8_t rl_asts;
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__le16 rl_wait_type;
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__le16 rl_namelen;
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char rl_name[DLM_RESNAME_MAXLEN];
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char rl_lvb[0];
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};
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struct dlm_ls {
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struct list_head ls_list; /* list of lockspaces */
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dlm_lockspace_t *ls_local_handle;
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uint32_t ls_global_id; /* global unique lockspace ID */
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uint32_t ls_exflags;
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int ls_lvblen;
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int ls_count; /* reference count */
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unsigned long ls_flags; /* LSFL_ */
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struct kobject ls_kobj;
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struct dlm_rsbtable *ls_rsbtbl;
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uint32_t ls_rsbtbl_size;
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struct dlm_lkbtable *ls_lkbtbl;
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uint32_t ls_lkbtbl_size;
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struct dlm_dirtable *ls_dirtbl;
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uint32_t ls_dirtbl_size;
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struct mutex ls_waiters_mutex;
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struct list_head ls_waiters; /* lkbs needing a reply */
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struct mutex ls_orphans_mutex;
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struct list_head ls_orphans;
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struct mutex ls_timeout_mutex;
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struct list_head ls_timeout;
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struct list_head ls_nodes; /* current nodes in ls */
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struct list_head ls_nodes_gone; /* dead node list, recovery */
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int ls_num_nodes; /* number of nodes in ls */
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int ls_low_nodeid;
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int ls_total_weight;
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int *ls_node_array;
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gfp_t ls_allocation;
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struct dlm_rsb ls_stub_rsb; /* for returning errors */
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struct dlm_lkb ls_stub_lkb; /* for returning errors */
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struct dlm_message ls_stub_ms; /* for faking a reply */
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struct dentry *ls_debug_rsb_dentry; /* debugfs */
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struct dentry *ls_debug_waiters_dentry; /* debugfs */
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struct dentry *ls_debug_locks_dentry; /* debugfs */
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wait_queue_head_t ls_uevent_wait; /* user part of join/leave */
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int ls_uevent_result;
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struct completion ls_members_done;
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int ls_members_result;
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struct miscdevice ls_device;
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/* recovery related */
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struct timer_list ls_timer;
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struct task_struct *ls_recoverd_task;
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struct mutex ls_recoverd_active;
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spinlock_t ls_recover_lock;
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unsigned long ls_recover_begin; /* jiffies timestamp */
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uint32_t ls_recover_status; /* DLM_RS_ */
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uint64_t ls_recover_seq;
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struct dlm_recover *ls_recover_args;
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struct rw_semaphore ls_in_recovery; /* block local requests */
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struct rw_semaphore ls_recv_active; /* block dlm_recv */
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struct list_head ls_requestqueue;/* queue remote requests */
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struct mutex ls_requestqueue_mutex;
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struct dlm_rcom *ls_recover_buf;
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int ls_recover_nodeid; /* for debugging */
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uint64_t ls_rcom_seq;
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spinlock_t ls_rcom_spin;
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struct list_head ls_recover_list;
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spinlock_t ls_recover_list_lock;
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int ls_recover_list_count;
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wait_queue_head_t ls_wait_general;
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struct mutex ls_clear_proc_locks;
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|
|
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struct list_head ls_root_list; /* root resources */
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struct rw_semaphore ls_root_sem; /* protect root_list */
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|
|
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int ls_namelen;
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char ls_name[1];
|
|
};
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|
|
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#define LSFL_WORK 0
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#define LSFL_RUNNING 1
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#define LSFL_RECOVERY_STOP 2
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|
#define LSFL_RCOM_READY 3
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|
#define LSFL_RCOM_WAIT 4
|
|
#define LSFL_UEVENT_WAIT 5
|
|
#define LSFL_TIMEWARN 6
|
|
|
|
/* 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;
|
|
uint64_t xid;
|
|
};
|
|
|
|
#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;
|
|
struct list_head unlocking;
|
|
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;
|
|
}
|
|
|
|
int dlm_netlink_init(void);
|
|
void dlm_netlink_exit(void);
|
|
void dlm_timeout_warn(struct dlm_lkb *lkb);
|
|
int dlm_plock_init(void);
|
|
void dlm_plock_exit(void);
|
|
|
|
#ifdef CONFIG_DLM_DEBUG
|
|
int dlm_register_debugfs(void);
|
|
void dlm_unregister_debugfs(void);
|
|
int dlm_create_debug_file(struct dlm_ls *ls);
|
|
void dlm_delete_debug_file(struct dlm_ls *ls);
|
|
#else
|
|
static inline int dlm_register_debugfs(void) { return 0; }
|
|
static inline void dlm_unregister_debugfs(void) { }
|
|
static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
|
|
static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
|
|
#endif
|
|
|
|
#endif /* __DLM_INTERNAL_DOT_H__ */
|
|
|