267 lines
7.2 KiB
C
267 lines
7.2 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 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 version 2.
|
|
*/
|
|
|
|
#ifndef __GLOCK_DOT_H__
|
|
#define __GLOCK_DOT_H__
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/parser.h>
|
|
#include "incore.h"
|
|
|
|
/* Options for hostdata parser */
|
|
|
|
enum {
|
|
Opt_jid,
|
|
Opt_id,
|
|
Opt_first,
|
|
Opt_nodir,
|
|
Opt_err,
|
|
};
|
|
|
|
/*
|
|
* lm_lockname types
|
|
*/
|
|
|
|
#define LM_TYPE_RESERVED 0x00
|
|
#define LM_TYPE_NONDISK 0x01
|
|
#define LM_TYPE_INODE 0x02
|
|
#define LM_TYPE_RGRP 0x03
|
|
#define LM_TYPE_META 0x04
|
|
#define LM_TYPE_IOPEN 0x05
|
|
#define LM_TYPE_FLOCK 0x06
|
|
#define LM_TYPE_PLOCK 0x07
|
|
#define LM_TYPE_QUOTA 0x08
|
|
#define LM_TYPE_JOURNAL 0x09
|
|
|
|
/*
|
|
* lm_lock() states
|
|
*
|
|
* SHARED is compatible with SHARED, not with DEFERRED or EX.
|
|
* DEFERRED is compatible with DEFERRED, not with SHARED or EX.
|
|
*/
|
|
|
|
#define LM_ST_UNLOCKED 0
|
|
#define LM_ST_EXCLUSIVE 1
|
|
#define LM_ST_DEFERRED 2
|
|
#define LM_ST_SHARED 3
|
|
|
|
/*
|
|
* lm_lock() flags
|
|
*
|
|
* LM_FLAG_TRY
|
|
* Don't wait to acquire the lock if it can't be granted immediately.
|
|
*
|
|
* LM_FLAG_TRY_1CB
|
|
* Send one blocking callback if TRY is set and the lock is not granted.
|
|
*
|
|
* LM_FLAG_NOEXP
|
|
* GFS sets this flag on lock requests it makes while doing journal recovery.
|
|
* These special requests should not be blocked due to the recovery like
|
|
* ordinary locks would be.
|
|
*
|
|
* LM_FLAG_ANY
|
|
* A SHARED request may also be granted in DEFERRED, or a DEFERRED request may
|
|
* also be granted in SHARED. The preferred state is whichever is compatible
|
|
* with other granted locks, or the specified state if no other locks exist.
|
|
*
|
|
* LM_FLAG_PRIORITY
|
|
* Override fairness considerations. Suppose a lock is held in a shared state
|
|
* and there is a pending request for the deferred state. A shared lock
|
|
* request with the priority flag would be allowed to bypass the deferred
|
|
* request and directly join the other shared lock. A shared lock request
|
|
* without the priority flag might be forced to wait until the deferred
|
|
* requested had acquired and released the lock.
|
|
*/
|
|
|
|
#define LM_FLAG_TRY 0x00000001
|
|
#define LM_FLAG_TRY_1CB 0x00000002
|
|
#define LM_FLAG_NOEXP 0x00000004
|
|
#define LM_FLAG_ANY 0x00000008
|
|
#define LM_FLAG_PRIORITY 0x00000010
|
|
#define GL_ASYNC 0x00000040
|
|
#define GL_EXACT 0x00000080
|
|
#define GL_SKIP 0x00000100
|
|
#define GL_ATIME 0x00000200
|
|
#define GL_NOCACHE 0x00000400
|
|
|
|
/*
|
|
* lm_lock() and lm_async_cb return flags
|
|
*
|
|
* LM_OUT_ST_MASK
|
|
* Masks the lower two bits of lock state in the returned value.
|
|
*
|
|
* LM_OUT_CANCELED
|
|
* The lock request was canceled.
|
|
*
|
|
* LM_OUT_ASYNC
|
|
* The result of the request will be returned in an LM_CB_ASYNC callback.
|
|
*
|
|
*/
|
|
|
|
#define LM_OUT_ST_MASK 0x00000003
|
|
#define LM_OUT_CANCELED 0x00000008
|
|
#define LM_OUT_ASYNC 0x00000080
|
|
#define LM_OUT_ERROR 0x00000100
|
|
|
|
/*
|
|
* lm_recovery_done() messages
|
|
*/
|
|
|
|
#define LM_RD_GAVEUP 308
|
|
#define LM_RD_SUCCESS 309
|
|
|
|
#define GLR_TRYFAILED 13
|
|
|
|
struct lm_lockops {
|
|
const char *lm_proto_name;
|
|
int (*lm_mount) (struct gfs2_sbd *sdp, const char *fsname);
|
|
void (*lm_unmount) (struct gfs2_sbd *sdp);
|
|
void (*lm_withdraw) (struct gfs2_sbd *sdp);
|
|
void (*lm_put_lock) (struct kmem_cache *cachep, void *gl);
|
|
unsigned int (*lm_lock) (struct gfs2_glock *gl,
|
|
unsigned int req_state, unsigned int flags);
|
|
void (*lm_cancel) (struct gfs2_glock *gl);
|
|
const match_table_t *lm_tokens;
|
|
};
|
|
|
|
#define LM_FLAG_TRY 0x00000001
|
|
#define LM_FLAG_TRY_1CB 0x00000002
|
|
#define LM_FLAG_NOEXP 0x00000004
|
|
#define LM_FLAG_ANY 0x00000008
|
|
#define LM_FLAG_PRIORITY 0x00000010
|
|
|
|
#define GL_ASYNC 0x00000040
|
|
#define GL_EXACT 0x00000080
|
|
#define GL_SKIP 0x00000100
|
|
#define GL_NOCACHE 0x00000400
|
|
|
|
#define GLR_TRYFAILED 13
|
|
|
|
extern struct workqueue_struct *gfs2_delete_workqueue;
|
|
static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
|
|
{
|
|
struct gfs2_holder *gh;
|
|
struct pid *pid;
|
|
|
|
/* Look in glock's list of holders for one with current task as owner */
|
|
spin_lock(&gl->gl_spin);
|
|
pid = task_pid(current);
|
|
list_for_each_entry(gh, &gl->gl_holders, gh_list) {
|
|
if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
|
|
break;
|
|
if (gh->gh_owner_pid == pid)
|
|
goto out;
|
|
}
|
|
gh = NULL;
|
|
out:
|
|
spin_unlock(&gl->gl_spin);
|
|
|
|
return gh;
|
|
}
|
|
|
|
static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
|
|
{
|
|
return gl->gl_state == LM_ST_EXCLUSIVE;
|
|
}
|
|
|
|
static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
|
|
{
|
|
return gl->gl_state == LM_ST_DEFERRED;
|
|
}
|
|
|
|
static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
|
|
{
|
|
return gl->gl_state == LM_ST_SHARED;
|
|
}
|
|
|
|
static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
|
|
{
|
|
int ret;
|
|
spin_lock(&gl->gl_spin);
|
|
ret = test_bit(GLF_DEMOTE, &gl->gl_flags);
|
|
spin_unlock(&gl->gl_spin);
|
|
return ret;
|
|
}
|
|
|
|
int gfs2_glock_get(struct gfs2_sbd *sdp,
|
|
u64 number, const struct gfs2_glock_operations *glops,
|
|
int create, struct gfs2_glock **glp);
|
|
void gfs2_glock_hold(struct gfs2_glock *gl);
|
|
void gfs2_glock_put_nolock(struct gfs2_glock *gl);
|
|
int gfs2_glock_put(struct gfs2_glock *gl);
|
|
void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
|
|
struct gfs2_holder *gh);
|
|
void gfs2_holder_reinit(unsigned int state, unsigned flags,
|
|
struct gfs2_holder *gh);
|
|
void gfs2_holder_uninit(struct gfs2_holder *gh);
|
|
int gfs2_glock_nq(struct gfs2_holder *gh);
|
|
int gfs2_glock_poll(struct gfs2_holder *gh);
|
|
int gfs2_glock_wait(struct gfs2_holder *gh);
|
|
void gfs2_glock_dq(struct gfs2_holder *gh);
|
|
void gfs2_glock_dq_wait(struct gfs2_holder *gh);
|
|
|
|
void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
|
|
int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
|
|
u64 number, const struct gfs2_glock_operations *glops,
|
|
unsigned int state, int flags, struct gfs2_holder *gh);
|
|
|
|
int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
|
|
void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
|
|
void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
|
|
void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
|
|
|
|
/**
|
|
* gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
|
|
* @gl: the glock
|
|
* @state: the state we're requesting
|
|
* @flags: the modifier flags
|
|
* @gh: the holder structure
|
|
*
|
|
* Returns: 0, GLR_*, or errno
|
|
*/
|
|
|
|
static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
|
|
unsigned int state, int flags,
|
|
struct gfs2_holder *gh)
|
|
{
|
|
int error;
|
|
|
|
gfs2_holder_init(gl, state, flags, gh);
|
|
|
|
error = gfs2_glock_nq(gh);
|
|
if (error)
|
|
gfs2_holder_uninit(gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* Lock Value Block functions */
|
|
|
|
int gfs2_lvb_hold(struct gfs2_glock *gl);
|
|
void gfs2_lvb_unhold(struct gfs2_glock *gl);
|
|
|
|
void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
|
|
void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
|
|
void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
|
|
void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
|
|
void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
|
|
void gfs2_glock_thaw(struct gfs2_sbd *sdp);
|
|
|
|
int __init gfs2_glock_init(void);
|
|
void gfs2_glock_exit(void);
|
|
|
|
int gfs2_create_debugfs_file(struct gfs2_sbd *sdp);
|
|
void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp);
|
|
int gfs2_register_debugfs(void);
|
|
void gfs2_unregister_debugfs(void);
|
|
|
|
extern const struct lm_lockops gfs2_dlm_ops;
|
|
|
|
#endif /* __GLOCK_DOT_H__ */
|