[people/ms/linux.git] / fs / gfs2 / glock.h

/*
 * 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 "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_LOCAL_EXCL		0x00000020
#define GL_ASYNC		0x00000040
#define GL_EXACT		0x00000080
#define GL_SKIP			0x00000100
#define GL_ATIME		0x00000200
#define GL_NOCACHE		0x00000400
#define GL_NOCANCEL		0x00001000
#define GL_AOP			0x00004000
#define GL_DUMP			0x00008000

#define GLR_TRYFAILED		13
#define GLR_CANCELED		14

static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
{
	struct gfs2_holder *gh;
	int locked = 0;

	/* Look in glock's list of holders for one with current task as owner */
	spin_lock(&gl->gl_spin);
	list_for_each_entry(gh, &gl->gl_holders, gh_list) {
		if (gh->gh_owner == current) {
			locked = 1;
			break;
		}
	}
	spin_unlock(&gl->gl_spin);

	return locked;
}

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 = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
	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);
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);

void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
void gfs2_glock_drop_th(struct gfs2_glock *gl);

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);

int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);

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_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number,
			     const struct gfs2_glock_operations *glops,
			     unsigned int state, int flags);
void gfs2_glock_inode_squish(struct inode *inode);

/**
 * 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(lm_fsdata_t *fsdata, unsigned int type, void *data);

void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);

void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
void gfs2_reclaim_glock(struct gfs2_sbd *sdp);

void gfs2_scand_internal(struct gfs2_sbd *sdp);
void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);

#endif /* __GLOCK_DOT_H__ */
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
	9
	10	#ifndef __GLOCK_DOT_H__
	11	#define __GLOCK_DOT_H__
	12
f2f7ba52 SW	13	#include "incore.h"
f2f7ba52 SW	14
b3b94faa DT	15	/* Flags for lock requests; used in gfs2_holder gh_flag field.
	16	From lm_interface.h:
	17	#define LM_FLAG_TRY 0x00000001
	18	#define LM_FLAG_TRY_1CB 0x00000002
	19	#define LM_FLAG_NOEXP 0x00000004
	20	#define LM_FLAG_ANY 0x00000008
	21	#define LM_FLAG_PRIORITY 0x00000010 */
	22
	23	#define GL_LOCAL_EXCL 0x00000020
	24	#define GL_ASYNC 0x00000040
	25	#define GL_EXACT 0x00000080
	26	#define GL_SKIP 0x00000100
	27	#define GL_ATIME 0x00000200
	28	#define GL_NOCACHE 0x00000400
b3b94faa	29	#define GL_NOCANCEL 0x00001000
fe1bdedc	30	#define GL_AOP 0x00004000
320dd101	31	#define GL_DUMP 0x00008000
b3b94faa DT	32
	33	#define GLR_TRYFAILED 13
	34	#define GLR_CANCELED 14
	35
	36	static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
	37	{
	38	struct gfs2_holder *gh;
	39	int locked = 0;
	40
	41	/* Look in glock's list of holders for one with current task as owner */
	42	spin_lock(&gl->gl_spin);
	43	list_for_each_entry(gh, &gl->gl_holders, gh_list) {
	44	if (gh->gh_owner == current) {
	45	locked = 1;
	46	break;
	47	}
	48	}
	49	spin_unlock(&gl->gl_spin);
	50
	51	return locked;
	52	}
	53
	54	static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
	55	{
50299965	56	return gl->gl_state == LM_ST_EXCLUSIVE;
b3b94faa DT	57	}
	58
	59	static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
	60	{
50299965	61	return gl->gl_state == LM_ST_DEFERRED;
b3b94faa DT	62	}
	63
	64	static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
	65	{
50299965	66	return gl->gl_state == LM_ST_SHARED;
b3b94faa DT	67	}
	68
	69	static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
	70	{
	71	int ret;
	72	spin_lock(&gl->gl_spin);
	73	ret = !list_empty(&gl->gl_waiters2) \|\| !list_empty(&gl->gl_waiters3);
	74	spin_unlock(&gl->gl_spin);
	75	return ret;
	76	}
	77
b3b94faa	78	int gfs2_glock_get(struct gfs2_sbd *sdp,
cd915493	79	u64 number, const struct gfs2_glock_operations *glops,
b3b94faa DT	80	int create, struct gfs2_glock **glp);
	81	void gfs2_glock_hold(struct gfs2_glock *gl);
	82	int gfs2_glock_put(struct gfs2_glock *gl);
190562bd	83	void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
b3b94faa	84	struct gfs2_holder *gh);
190562bd SW	85	void gfs2_holder_reinit(unsigned int state, unsigned flags,
190562bd SW	86	struct gfs2_holder *gh);
b3b94faa	87	void gfs2_holder_uninit(struct gfs2_holder *gh);
b3b94faa DT	88
	89	void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
	90	void gfs2_glock_drop_th(struct gfs2_glock *gl);
	91
b3b94faa DT	92	int gfs2_glock_nq(struct gfs2_holder *gh);
	93	int gfs2_glock_poll(struct gfs2_holder *gh);
	94	int gfs2_glock_wait(struct gfs2_holder *gh);
	95	void gfs2_glock_dq(struct gfs2_holder *gh);
	96
b3b94faa DT	97	int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
b3b94faa DT	98
b3b94faa DT	99	void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
b3b94faa DT	100	int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
cd915493	101	u64 number, const struct gfs2_glock_operations *glops,
b3b94faa DT	102	unsigned int state, int flags, struct gfs2_holder *gh);
	103
	104	int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
	105	void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
	106	void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
	107
cd915493	108	void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number,
8fb4b536	109	const struct gfs2_glock_operations *glops,
b3b94faa	110	unsigned int state, int flags);
feaa7bba	111	void gfs2_glock_inode_squish(struct inode *inode);
b3b94faa	112
d0dc80db SW	113	/**
	114	* gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
	115	* @gl: the glock
	116	* @state: the state we're requesting
	117	* @flags: the modifier flags
	118	* @gh: the holder structure
	119	*
	120	* Returns: 0, GLR_*, or errno
	121	*/
	122
	123	static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
	124	unsigned int state, int flags,
	125	struct gfs2_holder *gh)
	126	{
	127	int error;
	128
	129	gfs2_holder_init(gl, state, flags, gh);
	130
	131	error = gfs2_glock_nq(gh);
	132	if (error)
	133	gfs2_holder_uninit(gh);
	134
	135	return error;
	136	}
	137
b3b94faa DT	138	/* Lock Value Block functions */
	139
	140	int gfs2_lvb_hold(struct gfs2_glock *gl);
	141	void gfs2_lvb_unhold(struct gfs2_glock *gl);
b3b94faa DT	142
	143	void gfs2_glock_cb(lm_fsdata_t fsdata, unsigned int type, void data);
	144
b3b94faa DT	145	void gfs2_iopen_go_callback(struct gfs2_glock *gl, unsigned int state);
	146
	147	void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
	148	void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
	149
	150	void gfs2_scand_internal(struct gfs2_sbd *sdp);
	151	void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
	152
b3b94faa	153	#endif /* __GLOCK_DOT_H__ */