189 lines
5.1 KiB
C
189 lines
5.1 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2005 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 version 2.
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*/
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#ifndef LOCK_DLM_DOT_H
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#define LOCK_DLM_DOT_H
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/socket.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <linux/kobject.h>
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#include <linux/fcntl.h>
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#include <linux/wait.h>
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#include <net/sock.h>
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#include <linux/dlm.h>
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#include <linux/lm_interface.h>
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/*
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* Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
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* prefix of lock_dlm_ gets awkward. Externally, GFS refers to this module
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* as "lock_dlm".
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*/
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#define GDLM_STRNAME_BYTES 24
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#define GDLM_LVB_SIZE 32
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#define GDLM_DROP_COUNT 0
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#define GDLM_DROP_PERIOD 60
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#define GDLM_NAME_LEN 128
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/* GFS uses 12 bytes to identify a resource (32 bit type + 64 bit number).
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We sprintf these numbers into a 24 byte string of hex values to make them
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human-readable (to make debugging simpler.) */
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struct gdlm_strname {
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unsigned char name[GDLM_STRNAME_BYTES];
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unsigned short namelen;
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};
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enum {
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DFL_BLOCK_LOCKS = 0,
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DFL_SPECTATOR = 1,
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DFL_WITHDRAW = 2,
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};
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struct gdlm_ls {
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u32 id;
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int jid;
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int first;
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int first_done;
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unsigned long flags;
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struct kobject kobj;
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char clustername[GDLM_NAME_LEN];
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char fsname[GDLM_NAME_LEN];
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int fsflags;
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dlm_lockspace_t *dlm_lockspace;
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lm_callback_t fscb;
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struct gfs2_sbd *sdp;
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int recover_jid;
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int recover_jid_done;
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int recover_jid_status;
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spinlock_t async_lock;
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struct list_head complete;
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struct list_head blocking;
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struct list_head delayed;
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struct list_head submit;
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struct list_head all_locks;
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u32 all_locks_count;
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wait_queue_head_t wait_control;
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struct task_struct *thread1;
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struct task_struct *thread2;
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wait_queue_head_t thread_wait;
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unsigned long drop_time;
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int drop_locks_count;
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int drop_locks_period;
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};
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enum {
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LFL_NOBLOCK = 0,
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LFL_NOCACHE = 1,
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LFL_DLM_UNLOCK = 2,
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LFL_DLM_CANCEL = 3,
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LFL_SYNC_LVB = 4,
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LFL_FORCE_PROMOTE = 5,
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LFL_REREQUEST = 6,
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LFL_ACTIVE = 7,
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LFL_INLOCK = 8,
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LFL_CANCEL = 9,
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LFL_NOBAST = 10,
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LFL_HEADQUE = 11,
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LFL_UNLOCK_DELETE = 12,
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LFL_AST_WAIT = 13,
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};
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struct gdlm_lock {
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struct gdlm_ls *ls;
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struct lm_lockname lockname;
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struct gdlm_strname strname;
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char *lvb;
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struct dlm_lksb lksb;
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s16 cur;
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s16 req;
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s16 prev_req;
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u32 lkf; /* dlm flags DLM_LKF_ */
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unsigned long flags; /* lock_dlm flags LFL_ */
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int bast_mode; /* protected by async_lock */
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struct list_head clist; /* complete */
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struct list_head blist; /* blocking */
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struct list_head delay_list; /* delayed */
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struct list_head all_list; /* all locks for the fs */
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struct gdlm_lock *hold_null; /* NL lock for hold_lvb */
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};
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#define gdlm_assert(assertion, fmt, args...) \
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do { \
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if (unlikely(!(assertion))) { \
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printk(KERN_EMERG "lock_dlm: fatal assertion failed \"%s\"\n" \
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"lock_dlm: " fmt "\n", \
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#assertion, ##args); \
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BUG(); \
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} \
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} while (0)
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#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "\n" , ## arg)
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#define log_info(fmt, arg...) log_print(KERN_INFO , fmt , ## arg)
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#define log_error(fmt, arg...) log_print(KERN_ERR , fmt , ## arg)
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#ifdef LOCK_DLM_LOG_DEBUG
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#define log_debug(fmt, arg...) log_print(KERN_DEBUG , fmt , ## arg)
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#else
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#define log_debug(fmt, arg...)
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#endif
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/* sysfs.c */
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int gdlm_sysfs_init(void);
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void gdlm_sysfs_exit(void);
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int gdlm_kobject_setup(struct gdlm_ls *, struct kobject *);
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void gdlm_kobject_release(struct gdlm_ls *);
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/* thread.c */
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int gdlm_init_threads(struct gdlm_ls *);
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void gdlm_release_threads(struct gdlm_ls *);
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/* lock.c */
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s16 gdlm_make_lmstate(s16);
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void gdlm_queue_delayed(struct gdlm_lock *);
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void gdlm_submit_delayed(struct gdlm_ls *);
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int gdlm_release_all_locks(struct gdlm_ls *);
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void gdlm_delete_lp(struct gdlm_lock *);
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unsigned int gdlm_do_lock(struct gdlm_lock *);
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int gdlm_get_lock(void *, struct lm_lockname *, void **);
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void gdlm_put_lock(void *);
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unsigned int gdlm_lock(void *, unsigned int, unsigned int, unsigned int);
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unsigned int gdlm_unlock(void *, unsigned int);
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void gdlm_cancel(void *);
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int gdlm_hold_lvb(void *, char **);
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void gdlm_unhold_lvb(void *, char *);
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/* plock.c */
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int gdlm_plock_init(void);
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void gdlm_plock_exit(void);
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int gdlm_plock(void *, struct lm_lockname *, struct file *, int,
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struct file_lock *);
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int gdlm_plock_get(void *, struct lm_lockname *, struct file *,
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struct file_lock *);
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int gdlm_punlock(void *, struct lm_lockname *, struct file *,
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struct file_lock *);
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#endif
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