[deliverable/linux.git] / fs / gfs2 / lm.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2005 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 v.2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/delay.h>
#include <linux/gfs2_ondisk.h>
#include <asm/semaphore.h>

#include "gfs2.h"
#include "lm_interface.h"
#include "incore.h"
#include "glock.h"
#include "lm.h"
#include "super.h"
#include "util.h"
#include "lvb.h"

/**
 * gfs2_lm_mount - mount a locking protocol
 * @sdp: the filesystem
 * @args: mount arguements
 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 *
 * Returns: errno
 */

int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
{
	char *proto = sdp->sd_proto_name;
	char *table = sdp->sd_table_name;
	int flags = 0;
	int error;

	if (sdp->sd_args.ar_spectator)
		flags |= LM_MFLAG_SPECTATOR;

	fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);

	error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
				     gfs2_glock_cb, sdp,
				     GFS2_MIN_LVB_SIZE, flags,
				     &sdp->sd_lockstruct, &sdp->sd_kobj);
	if (error) {
		fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
			proto, table, sdp->sd_args.ar_hostdata);
		goto out;
	}

	if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lockspace) ||
	    gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
	    gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
				  GFS2_MIN_LVB_SIZE)) {
		gfs2_unmount_lockproto(&sdp->sd_lockstruct);
		goto out;
	}

	if (sdp->sd_args.ar_spectator)
		snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
	else
		snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
			 sdp->sd_lockstruct.ls_jid);

	fs_info(sdp, "Joined cluster. Now mounting FS...\n");

	if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
	    !sdp->sd_args.ar_ignore_local_fs) {
		sdp->sd_args.ar_localflocks = 1;
		sdp->sd_args.ar_localcaching = 1;
	}

 out:
	return error;
}

void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
					sdp->sd_lockstruct.ls_lockspace);
}

void gfs2_lm_unmount(struct gfs2_sbd *sdp)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		gfs2_unmount_lockproto(&sdp->sd_lockstruct);
}

int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
{
	va_list args;

	if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
		return 0;

	va_start(args, fmt);
	vprintk(fmt, args);
	va_end(args);

	fs_err(sdp, "about to withdraw from the cluster\n");
	BUG_ON(sdp->sd_args.ar_debug);
	

	fs_err(sdp, "waiting for outstanding I/O\n");

	/* FIXME: suspend dm device so oustanding bio's complete
	   and all further io requests fail */

	fs_err(sdp, "telling LM to withdraw\n");
	gfs2_withdraw_lockproto(&sdp->sd_lockstruct);
	fs_err(sdp, "withdrawn\n");
	dump_stack();

	return -1;
}

int gfs2_lm_get_lock(struct gfs2_sbd *sdp, struct lm_lockname *name,
		     lm_lock_t **lockp)
{
	int error;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		error = -EIO;
	else
		error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
				sdp->sd_lockstruct.ls_lockspace, name, lockp);
	return error;
}

void gfs2_lm_put_lock(struct gfs2_sbd *sdp, lm_lock_t *lock)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		sdp->sd_lockstruct.ls_ops->lm_put_lock(lock);
}

unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, lm_lock_t *lock,
			  unsigned int cur_state, unsigned int req_state,
			  unsigned int flags)
{
	int ret;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		ret = 0;
	else
		ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
							 cur_state,
							 req_state, flags);
	return ret;
}

unsigned int gfs2_lm_unlock(struct gfs2_sbd *sdp, lm_lock_t *lock,
			    unsigned int cur_state)
{
	int ret;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		ret = 0;
	else
		ret =  sdp->sd_lockstruct.ls_ops->lm_unlock(lock, cur_state);
	return ret;
}

void gfs2_lm_cancel(struct gfs2_sbd *sdp, lm_lock_t *lock)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		sdp->sd_lockstruct.ls_ops->lm_cancel(lock);
}

int gfs2_lm_hold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char **lvbp)
{
	int error;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		error = -EIO;
	else
		error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
	return error;
}

void gfs2_lm_unhold_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(lock, lvb);
}

void gfs2_lm_sync_lvb(struct gfs2_sbd *sdp, lm_lock_t *lock, char *lvb)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		sdp->sd_lockstruct.ls_ops->lm_sync_lvb(lock, lvb);
}

int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
		      struct file *file, struct file_lock *fl)
{
	int error;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		error = -EIO;
	else
		error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
			sdp->sd_lockstruct.ls_lockspace,
			name, file, fl);
	return error;
}

int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
		  struct file *file, int cmd, struct file_lock *fl)
{
	int error;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		error = -EIO;
	else
		error = sdp->sd_lockstruct.ls_ops->lm_plock(
			sdp->sd_lockstruct.ls_lockspace,
			name, file, cmd, fl);
	return error;
}

int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
		    struct file *file, struct file_lock *fl)
{
	int error;
	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		error = -EIO;
	else
		error = sdp->sd_lockstruct.ls_ops->lm_punlock(
			sdp->sd_lockstruct.ls_lockspace,
			name, file, fl);
	return error;
}

void gfs2_lm_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
			   unsigned int message)
{
	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
		sdp->sd_lockstruct.ls_ops->lm_recovery_done(
			sdp->sd_lockstruct.ls_lockspace, jid, message);
}
Commit	Line	Data
b3b94faa DT	1	/*
	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	3	* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
	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
	7	* of the GNU General Public License v.2.
	8	*/
	9
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/completion.h>
	14	#include <linux/buffer_head.h>
	15	#include <linux/delay.h>
5c676f6d	16	#include <linux/gfs2_ondisk.h>
b3b94faa DT	17	#include <asm/semaphore.h>
	18
	19	#include "gfs2.h"
5c676f6d SW	20	#include "lm_interface.h"
5c676f6d SW	21	#include "incore.h"
b3b94faa DT	22	#include "glock.h"
	23	#include "lm.h"
	24	#include "super.h"
5c676f6d SW	25	#include "util.h"
5c676f6d SW	26	#include "lvb.h"
b3b94faa DT	27
	28	/**
	29	* gfs2_lm_mount - mount a locking protocol
	30	* @sdp: the filesystem
	31	* @args: mount arguements
	32	* @silent: if 1, don't complain if the FS isn't a GFS2 fs
	33	*
	34	* Returns: errno
	35	*/
	36
	37	int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
	38	{
	39	char *proto = sdp->sd_proto_name;
	40	char *table = sdp->sd_table_name;
	41	int flags = 0;
	42	int error;
	43
	44	if (sdp->sd_args.ar_spectator)
	45	flags \|= LM_MFLAG_SPECTATOR;
	46
	47	fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
	48
	49	error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
	50	gfs2_glock_cb, sdp,
	51	GFS2_MIN_LVB_SIZE, flags,
	52	&sdp->sd_lockstruct, &sdp->sd_kobj);
	53	if (error) {
	54	fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
	55	proto, table, sdp->sd_args.ar_hostdata);
	56	goto out;
	57	}
	58
	59	if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lockspace) \|\|
	60	gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) \|\|
	61	gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
	62	GFS2_MIN_LVB_SIZE)) {
	63	gfs2_unmount_lockproto(&sdp->sd_lockstruct);
	64	goto out;
	65	}
	66
	67	if (sdp->sd_args.ar_spectator)
	68	snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
	69	else
	70	snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
	71	sdp->sd_lockstruct.ls_jid);
	72
	73	fs_info(sdp, "Joined cluster. Now mounting FS...\n");
	74
	75	if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
	76	!sdp->sd_args.ar_ignore_local_fs) {
	77	sdp->sd_args.ar_localflocks = 1;
	78	sdp->sd_args.ar_localcaching = 1;
	79	}
	80
	81	out:
	82	return error;
	83	}
	84
	85	void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
	86	{
	87	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
568f4c96 SW	88	sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
568f4c96 SW	89	sdp->sd_lockstruct.ls_lockspace);
b3b94faa DT	90	}
	91
	92	void gfs2_lm_unmount(struct gfs2_sbd *sdp)
	93	{
	94	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	95	gfs2_unmount_lockproto(&sdp->sd_lockstruct);
	96	}
	97
	98	int gfs2_lm_withdraw(struct gfs2_sbd sdp, char fmt, ...)
	99	{
	100	va_list args;
	101
	102	if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
	103	return 0;
	104
	105	va_start(args, fmt);
	106	vprintk(fmt, args);
	107	va_end(args);
	108
	109	fs_err(sdp, "about to withdraw from the cluster\n");
3a8fe9be SW	110	BUG_ON(sdp->sd_args.ar_debug);
3a8fe9be SW	111
b3b94faa DT	112
	113	fs_err(sdp, "waiting for outstanding I/O\n");
	114
	115	/* FIXME: suspend dm device so oustanding bio's complete
	116	and all further io requests fail */
	117
	118	fs_err(sdp, "telling LM to withdraw\n");
	119	gfs2_withdraw_lockproto(&sdp->sd_lockstruct);
	120	fs_err(sdp, "withdrawn\n");
	121	dump_stack();
	122
	123	return -1;
	124	}
	125
	126	int gfs2_lm_get_lock(struct gfs2_sbd sdp, struct lm_lockname name,
	127	lm_lock_t **lockp)
	128	{
	129	int error;
	130	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	131	error = -EIO;
	132	else
568f4c96 SW	133	error = sdp->sd_lockstruct.ls_ops->lm_get_lock(
568f4c96 SW	134	sdp->sd_lockstruct.ls_lockspace, name, lockp);
b3b94faa DT	135	return error;
	136	}
	137
	138	void gfs2_lm_put_lock(struct gfs2_sbd sdp, lm_lock_t lock)
	139	{
	140	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	141	sdp->sd_lockstruct.ls_ops->lm_put_lock(lock);
	142	}
	143
	144	unsigned int gfs2_lm_lock(struct gfs2_sbd sdp, lm_lock_t lock,
	145	unsigned int cur_state, unsigned int req_state,
	146	unsigned int flags)
	147	{
	148	int ret;
	149	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	150	ret = 0;
	151	else
	152	ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
	153	cur_state,
	154	req_state, flags);
	155	return ret;
	156	}
	157
	158	unsigned int gfs2_lm_unlock(struct gfs2_sbd sdp, lm_lock_t lock,
	159	unsigned int cur_state)
	160	{
	161	int ret;
	162	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	163	ret = 0;
	164	else
	165	ret = sdp->sd_lockstruct.ls_ops->lm_unlock(lock, cur_state);
	166	return ret;
	167	}
	168
	169	void gfs2_lm_cancel(struct gfs2_sbd sdp, lm_lock_t lock)
	170	{
	171	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	172	sdp->sd_lockstruct.ls_ops->lm_cancel(lock);
	173	}
	174
	175	int gfs2_lm_hold_lvb(struct gfs2_sbd sdp, lm_lock_t lock, char **lvbp)
	176	{
	177	int error;
	178	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	179	error = -EIO;
	180	else
	181	error = sdp->sd_lockstruct.ls_ops->lm_hold_lvb(lock, lvbp);
	182	return error;
	183	}
	184
	185	void gfs2_lm_unhold_lvb(struct gfs2_sbd sdp, lm_lock_t lock, char *lvb)
	186	{
	187	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	188	sdp->sd_lockstruct.ls_ops->lm_unhold_lvb(lock, lvb);
	189	}
	190
	191	void gfs2_lm_sync_lvb(struct gfs2_sbd sdp, lm_lock_t lock, char *lvb)
	192	{
	193	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
	194	sdp->sd_lockstruct.ls_ops->lm_sync_lvb(lock, lvb);
	195	}
	196
	197	int gfs2_lm_plock_get(struct gfs2_sbd sdp, struct lm_lockname name,
	198	struct file file, struct file_lock fl)
199	{
200	int error;
201	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
202	error = -EIO;
203	else
204	error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
205	sdp->sd_lockstruct.ls_lockspace,
206	name, file, fl);
207	return error;
208	}
209
210	int gfs2_lm_plock(struct gfs2_sbd sdp, struct lm_lockname name,
211	struct file file, int cmd, struct file_lock fl)
212	{
213	int error;
214	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
215	error = -EIO;
216	else
217	error = sdp->sd_lockstruct.ls_ops->lm_plock(
218	sdp->sd_lockstruct.ls_lockspace,
219	name, file, cmd, fl);
220	return error;
221	}
222
223	int gfs2_lm_punlock(struct gfs2_sbd sdp, struct lm_lockname name,
224	struct file file, struct file_lock fl)
225	{
226	int error;
227	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
228	error = -EIO;
229	else
230	error = sdp->sd_lockstruct.ls_ops->lm_punlock(
231	sdp->sd_lockstruct.ls_lockspace,
232	name, file, fl);
233	return error;
234	}
235
236	void gfs2_lm_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
237	unsigned int message)
238	{
239	if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
568f4c96 SW	240	sdp->sd_lockstruct.ls_ops->lm_recovery_done(
568f4c96 SW	241	sdp->sd_lockstruct.ls_lockspace, jid, message);
b3b94faa DT	242	}
b3b94faa DT	243