mirror of https://gitee.com/openkylin/linux.git
145 lines
4.0 KiB
C
145 lines
4.0 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 "incore.h"
|
|
|
|
/* Flags for lock requests; used in gfs2_holder gh_flag field.
|
|
From lm_interface.h:
|
|
#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
|
|
|
|
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);
|
|
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(void *cb_data, unsigned int type, void *data);
|
|
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);
|
|
|
|
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);
|
|
|
|
#endif /* __GLOCK_DOT_H__ */
|