[deliverable/linux.git] / fs / dlm / rcom.c

/******************************************************************************
*******************************************************************************
**
**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
**  Copyright (C) 2005-2008 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 "dlm_internal.h"
#include "lockspace.h"
#include "member.h"
#include "lowcomms.h"
#include "midcomms.h"
#include "rcom.h"
#include "recover.h"
#include "dir.h"
#include "config.h"
#include "memory.h"
#include "lock.h"
#include "util.h"


static int rcom_response(struct dlm_ls *ls)
{
	return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
}

static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
		       struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	char *mb;
	int mb_len = sizeof(struct dlm_rcom) + len;

	mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
	if (!mh) {
		log_print("create_rcom to %d type %d len %d ENOBUFS",
			  to_nodeid, type, len);
		return -ENOBUFS;
	}
	memset(mb, 0, mb_len);

	rc = (struct dlm_rcom *) mb;

	rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
	rc->rc_header.h_lockspace = ls->ls_global_id;
	rc->rc_header.h_nodeid = dlm_our_nodeid();
	rc->rc_header.h_length = mb_len;
	rc->rc_header.h_cmd = DLM_RCOM;

	rc->rc_type = type;

	spin_lock(&ls->ls_recover_lock);
	rc->rc_seq = ls->ls_recover_seq;
	spin_unlock(&ls->ls_recover_lock);

	*mh_ret = mh;
	*rc_ret = rc;
	return 0;
}

static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
		      struct dlm_rcom *rc)
{
	dlm_rcom_out(rc);
	dlm_lowcomms_commit_buffer(mh);
}

/* When replying to a status request, a node also sends back its
   configuration values.  The requesting node then checks that the remote
   node is configured the same way as itself. */

static void make_config(struct dlm_ls *ls, struct rcom_config *rf)
{
	rf->rf_lvblen = ls->ls_lvblen;
	rf->rf_lsflags = ls->ls_exflags;
}

static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
{
	struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;

	if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
		log_error(ls, "version mismatch: %x nodeid %d: %x",
			  DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
			  rc->rc_header.h_version);
		return -EPROTO;
	}

	if (rf->rf_lvblen != ls->ls_lvblen ||
	    rf->rf_lsflags != ls->ls_exflags) {
		log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
			  ls->ls_lvblen, ls->ls_exflags,
			  nodeid, rf->rf_lvblen, rf->rf_lsflags);
		return -EPROTO;
	}
	return 0;
}

static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq)
{
	spin_lock(&ls->ls_rcom_spin);
	*new_seq = ++ls->ls_rcom_seq;
	set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
	spin_unlock(&ls->ls_rcom_spin);
}

static void disallow_sync_reply(struct dlm_ls *ls)
{
	spin_lock(&ls->ls_rcom_spin);
	clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
	clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
	spin_unlock(&ls->ls_rcom_spin);
}

int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	int error = 0;

	ls->ls_recover_nodeid = nodeid;

	if (nodeid == dlm_our_nodeid()) {
		rc = (struct dlm_rcom *) ls->ls_recover_buf;
		rc->rc_result = dlm_recover_status(ls);
		goto out;
	}

	error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, 0, &rc, &mh);
	if (error)
		goto out;

	allow_sync_reply(ls, &rc->rc_id);
	memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);

	send_rcom(ls, mh, rc);

	error = dlm_wait_function(ls, &rcom_response);
	disallow_sync_reply(ls);
	if (error)
		goto out;

	rc = (struct dlm_rcom *) ls->ls_recover_buf;

	if (rc->rc_result == -ESRCH) {
		/* we pretend the remote lockspace exists with 0 status */
		log_debug(ls, "remote node %d not ready", nodeid);
		rc->rc_result = 0;
	} else
		error = check_config(ls, rc, nodeid);
	/* the caller looks at rc_result for the remote recovery status */
 out:
	return error;
}

static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	int error, nodeid = rc_in->rc_header.h_nodeid;

	error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
			    sizeof(struct rcom_config), &rc, &mh);
	if (error)
		return;
	rc->rc_id = rc_in->rc_id;
	rc->rc_seq_reply = rc_in->rc_seq;
	rc->rc_result = dlm_recover_status(ls);
	make_config(ls, (struct rcom_config *) rc->rc_buf);

	send_rcom(ls, mh, rc);
}

static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
	spin_lock(&ls->ls_rcom_spin);
	if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
	    rc_in->rc_id != ls->ls_rcom_seq) {
		log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
			  rc_in->rc_type, rc_in->rc_header.h_nodeid,
			  (unsigned long long)rc_in->rc_id,
			  (unsigned long long)ls->ls_rcom_seq);
		goto out;
	}
	memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
	set_bit(LSFL_RCOM_READY, &ls->ls_flags);
	clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
	wake_up(&ls->ls_wait_general);
 out:
	spin_unlock(&ls->ls_rcom_spin);
}

int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	int error = 0, len = sizeof(struct dlm_rcom);

	ls->ls_recover_nodeid = nodeid;

	if (nodeid == dlm_our_nodeid()) {
		dlm_copy_master_names(ls, last_name, last_len,
		                      ls->ls_recover_buf + len,
		                      dlm_config.ci_buffer_size - len, nodeid);
		goto out;
	}

	error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
	if (error)
		goto out;
	memcpy(rc->rc_buf, last_name, last_len);

	allow_sync_reply(ls, &rc->rc_id);
	memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);

	send_rcom(ls, mh, rc);

	error = dlm_wait_function(ls, &rcom_response);
	disallow_sync_reply(ls);
 out:
	return error;
}

static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	int error, inlen, outlen, nodeid;

	nodeid = rc_in->rc_header.h_nodeid;
	inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
	outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);

	error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
	if (error)
		return;
	rc->rc_id = rc_in->rc_id;
	rc->rc_seq_reply = rc_in->rc_seq;

	dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
			      nodeid);
	send_rcom(ls, mh, rc);
}

int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	struct dlm_ls *ls = r->res_ls;
	int error;

	error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
			    &rc, &mh);
	if (error)
		goto out;
	memcpy(rc->rc_buf, r->res_name, r->res_length);
	rc->rc_id = (unsigned long) r;

	send_rcom(ls, mh, rc);
 out:
	return error;
}

static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
	int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);

	error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
	if (error)
		return;

	error = dlm_dir_lookup(ls, nodeid, rc_in->rc_buf, len, &ret_nodeid);
	if (error)
		ret_nodeid = error;
	rc->rc_result = ret_nodeid;
	rc->rc_id = rc_in->rc_id;
	rc->rc_seq_reply = rc_in->rc_seq;

	send_rcom(ls, mh, rc);
}

static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
	dlm_recover_master_reply(ls, rc_in);
}

static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
			   struct rcom_lock *rl)
{
	memset(rl, 0, sizeof(*rl));

	rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
	rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
	rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
	rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
	rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
	rl->rl_rqmode = lkb->lkb_rqmode;
	rl->rl_grmode = lkb->lkb_grmode;
	rl->rl_status = lkb->lkb_status;
	rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);

	if (lkb->lkb_bastaddr)
		rl->rl_asts |= AST_BAST;
	if (lkb->lkb_astaddr)
		rl->rl_asts |= AST_COMP;

	rl->rl_namelen = cpu_to_le16(r->res_length);
	memcpy(rl->rl_name, r->res_name, r->res_length);

	/* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
	   If so, receive_rcom_lock_args() won't take this copy. */

	if (lkb->lkb_lvbptr)
		memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
}

int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
{
	struct dlm_ls *ls = r->res_ls;
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	struct rcom_lock *rl;
	int error, len = sizeof(struct rcom_lock);

	if (lkb->lkb_lvbptr)
		len += ls->ls_lvblen;

	error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
	if (error)
		goto out;

	rl = (struct rcom_lock *) rc->rc_buf;
	pack_rcom_lock(r, lkb, rl);
	rc->rc_id = (unsigned long) r;

	send_rcom(ls, mh, rc);
 out:
	return error;
}

static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
	struct dlm_rcom *rc;
	struct dlm_mhandle *mh;
	int error, nodeid = rc_in->rc_header.h_nodeid;

	dlm_recover_master_copy(ls, rc_in);

	error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
			    sizeof(struct rcom_lock), &rc, &mh);
	if (error)
		return;

	/* We send back the same rcom_lock struct we received, but
	   dlm_recover_master_copy() has filled in rl_remid and rl_result */

	memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
	rc->rc_id = rc_in->rc_id;
	rc->rc_seq_reply = rc_in->rc_seq;

	send_rcom(ls, mh, rc);
}

/* If the lockspace doesn't exist then still send a status message
   back; it's possible that it just doesn't have its global_id yet. */

int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
{
	struct dlm_rcom *rc;
	struct rcom_config *rf;
	struct dlm_mhandle *mh;
	char *mb;
	int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);

	mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb);
	if (!mh)
		return -ENOBUFS;
	memset(mb, 0, mb_len);

	rc = (struct dlm_rcom *) mb;

	rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
	rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace;
	rc->rc_header.h_nodeid = dlm_our_nodeid();
	rc->rc_header.h_length = mb_len;
	rc->rc_header.h_cmd = DLM_RCOM;

	rc->rc_type = DLM_RCOM_STATUS_REPLY;
	rc->rc_id = rc_in->rc_id;
	rc->rc_seq_reply = rc_in->rc_seq;
	rc->rc_result = -ESRCH;

	rf = (struct rcom_config *) rc->rc_buf;
	rf->rf_lvblen = -1;

	dlm_rcom_out(rc);
	dlm_lowcomms_commit_buffer(mh);

	return 0;
}

static int is_old_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
{
	uint64_t seq;
	int rv = 0;

	switch (rc->rc_type) {
	case DLM_RCOM_STATUS_REPLY:
	case DLM_RCOM_NAMES_REPLY:
	case DLM_RCOM_LOOKUP_REPLY:
	case DLM_RCOM_LOCK_REPLY:
		spin_lock(&ls->ls_recover_lock);
		seq = ls->ls_recover_seq;
		spin_unlock(&ls->ls_recover_lock);
		if (rc->rc_seq_reply != seq) {
			log_debug(ls, "ignoring old reply %x from %d "
				      "seq_reply %llx expect %llx",
				      rc->rc_type, rc->rc_header.h_nodeid,
				      (unsigned long long)rc->rc_seq_reply,
				      (unsigned long long)seq);
			rv = 1;
		}
	}
	return rv;
}

/* Called by dlm_recv; corresponds to dlm_receive_message() but special
   recovery-only comms are sent through here. */

void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
{
	if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
		log_debug(ls, "ignoring recovery message %x from %d",
			  rc->rc_type, nodeid);
		goto out;
	}

	if (is_old_reply(ls, rc))
		goto out;

	switch (rc->rc_type) {
	case DLM_RCOM_STATUS:
		receive_rcom_status(ls, rc);
		break;

	case DLM_RCOM_NAMES:
		receive_rcom_names(ls, rc);
		break;

	case DLM_RCOM_LOOKUP:
		receive_rcom_lookup(ls, rc);
		break;

	case DLM_RCOM_LOCK:
		receive_rcom_lock(ls, rc);
		break;

	case DLM_RCOM_STATUS_REPLY:
		receive_sync_reply(ls, rc);
		break;

	case DLM_RCOM_NAMES_REPLY:
		receive_sync_reply(ls, rc);
		break;

	case DLM_RCOM_LOOKUP_REPLY:
		receive_rcom_lookup_reply(ls, rc);
		break;

	case DLM_RCOM_LOCK_REPLY:
		dlm_recover_process_copy(ls, rc);
		break;

	default:
		log_error(ls, "receive_rcom bad type %d", rc->rc_type);
	}
 out:
	return;
}
Commit	Line	Data
e7fd4179 DT	1	/******************************************************************************
	2	*******************************************************************************
	3	**
	4	** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
dbcfc347	5	** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved.
e7fd4179 DT	6	**
	7	** This copyrighted material is made available to anyone wishing to use,
	8	** modify, copy, or redistribute it subject to the terms and conditions
	9	** of the GNU General Public License v.2.
	10	**
	11	*******************************************************************************
	12	******************************************************************************/
	13
	14	#include "dlm_internal.h"
	15	#include "lockspace.h"
	16	#include "member.h"
	17	#include "lowcomms.h"
	18	#include "midcomms.h"
	19	#include "rcom.h"
	20	#include "recover.h"
	21	#include "dir.h"
	22	#include "config.h"
	23	#include "memory.h"
	24	#include "lock.h"
	25	#include "util.h"
	26
	27
	28	static int rcom_response(struct dlm_ls *ls)
	29	{
	30	return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
	31	}
	32
	33	static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
	34	struct dlm_rcom rc_ret, struct dlm_mhandle mh_ret)
	35	{
	36	struct dlm_rcom *rc;
	37	struct dlm_mhandle *mh;
	38	char *mb;
	39	int mb_len = sizeof(struct dlm_rcom) + len;
	40
44f487a5	41	mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
e7fd4179 DT	42	if (!mh) {
	43	log_print("create_rcom to %d type %d len %d ENOBUFS",
	44	to_nodeid, type, len);
	45	return -ENOBUFS;
	46	}
	47	memset(mb, 0, mb_len);
	48
	49	rc = (struct dlm_rcom *) mb;
	50
	51	rc->rc_header.h_version = (DLM_HEADER_MAJOR \| DLM_HEADER_MINOR);
	52	rc->rc_header.h_lockspace = ls->ls_global_id;
	53	rc->rc_header.h_nodeid = dlm_our_nodeid();
	54	rc->rc_header.h_length = mb_len;
	55	rc->rc_header.h_cmd = DLM_RCOM;
	56
	57	rc->rc_type = type;
	58
38aa8b0c DT	59	spin_lock(&ls->ls_recover_lock);
	60	rc->rc_seq = ls->ls_recover_seq;
	61	spin_unlock(&ls->ls_recover_lock);
	62
e7fd4179 DT	63	*mh_ret = mh;
	64	*rc_ret = rc;
	65	return 0;
	66	}
	67
	68	static void send_rcom(struct dlm_ls ls, struct dlm_mhandle mh,
	69	struct dlm_rcom *rc)
	70	{
	71	dlm_rcom_out(rc);
	72	dlm_lowcomms_commit_buffer(mh);
	73	}
	74
	75	/* When replying to a status request, a node also sends back its
	76	configuration values. The requesting node then checks that the remote
	77	node is configured the same way as itself. */
	78
	79	static void make_config(struct dlm_ls ls, struct rcom_config rf)
	80	{
	81	rf->rf_lvblen = ls->ls_lvblen;
	82	rf->rf_lsflags = ls->ls_exflags;
	83	}
	84
9e971b71	85	static int check_config(struct dlm_ls ls, struct dlm_rcom rc, int nodeid)
e7fd4179	86	{
9e971b71 DT	87	struct rcom_config rf = (struct rcom_config ) rc->rc_buf;
	88
	89	if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
	90	log_error(ls, "version mismatch: %x nodeid %d: %x",
	91	DLM_HEADER_MAJOR \| DLM_HEADER_MINOR, nodeid,
	92	rc->rc_header.h_version);
8b0e7b2c	93	return -EPROTO;
9e971b71 DT	94	}
9e971b71 DT	95
e7fd4179 DT	96	if (rf->rf_lvblen != ls->ls_lvblen \|\|
	97	rf->rf_lsflags != ls->ls_exflags) {
	98	log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
	99	ls->ls_lvblen, ls->ls_exflags,
	100	nodeid, rf->rf_lvblen, rf->rf_lsflags);
8b0e7b2c	101	return -EPROTO;
e7fd4179 DT	102	}
	103	return 0;
	104	}
	105
98f176fb DT	106	static void allow_sync_reply(struct dlm_ls ls, uint64_t new_seq)
	107	{
	108	spin_lock(&ls->ls_rcom_spin);
	109	*new_seq = ++ls->ls_rcom_seq;
	110	set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
	111	spin_unlock(&ls->ls_rcom_spin);
	112	}
	113
	114	static void disallow_sync_reply(struct dlm_ls *ls)
	115	{
	116	spin_lock(&ls->ls_rcom_spin);
	117	clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
	118	clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
	119	spin_unlock(&ls->ls_rcom_spin);
	120	}
	121
e7fd4179 DT	122	int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
	123	{
	124	struct dlm_rcom *rc;
	125	struct dlm_mhandle *mh;
	126	int error = 0;
	127
faa0f267	128	ls->ls_recover_nodeid = nodeid;
e7fd4179 DT	129
	130	if (nodeid == dlm_our_nodeid()) {
	131	rc = (struct dlm_rcom *) ls->ls_recover_buf;
	132	rc->rc_result = dlm_recover_status(ls);
	133	goto out;
	134	}
	135
	136	error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, 0, &rc, &mh);
	137	if (error)
	138	goto out;
98f176fb DT	139
98f176fb DT	140	allow_sync_reply(ls, &rc->rc_id);
68c817a1	141	memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
e7fd4179 DT	142
	143	send_rcom(ls, mh, rc);
	144
	145	error = dlm_wait_function(ls, &rcom_response);
98f176fb	146	disallow_sync_reply(ls);
e7fd4179 DT	147	if (error)
	148	goto out;
	149
	150	rc = (struct dlm_rcom *) ls->ls_recover_buf;
	151
	152	if (rc->rc_result == -ESRCH) {
	153	/* we pretend the remote lockspace exists with 0 status */
	154	log_debug(ls, "remote node %d not ready", nodeid);
	155	rc->rc_result = 0;
	156	} else
9e971b71	157	error = check_config(ls, rc, nodeid);
e7fd4179 DT	158	/* the caller looks at rc_result for the remote recovery status */
	159	out:
	160	return error;
	161	}
	162
	163	static void receive_rcom_status(struct dlm_ls ls, struct dlm_rcom rc_in)
	164	{
	165	struct dlm_rcom *rc;
	166	struct dlm_mhandle *mh;
	167	int error, nodeid = rc_in->rc_header.h_nodeid;
	168
	169	error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
	170	sizeof(struct rcom_config), &rc, &mh);
	171	if (error)
	172	return;
4a99c3d9	173	rc->rc_id = rc_in->rc_id;
38aa8b0c	174	rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 DT	175	rc->rc_result = dlm_recover_status(ls);
	176	make_config(ls, (struct rcom_config *) rc->rc_buf);
	177
	178	send_rcom(ls, mh, rc);
	179	}
	180
4a99c3d9	181	static void receive_sync_reply(struct dlm_ls ls, struct dlm_rcom rc_in)
e7fd4179	182	{
98f176fb DT	183	spin_lock(&ls->ls_rcom_spin);
	184	if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) \|\|
	185	rc_in->rc_id != ls->ls_rcom_seq) {
	186	log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
	187	rc_in->rc_type, rc_in->rc_header.h_nodeid,
57adf7ee RK	188	(unsigned long long)rc_in->rc_id,
57adf7ee RK	189	(unsigned long long)ls->ls_rcom_seq);
98f176fb	190	goto out;
4a99c3d9	191	}
e7fd4179 DT	192	memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
e7fd4179 DT	193	set_bit(LSFL_RCOM_READY, &ls->ls_flags);
98f176fb	194	clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
e7fd4179	195	wake_up(&ls->ls_wait_general);
98f176fb DT	196	out:
98f176fb DT	197	spin_unlock(&ls->ls_rcom_spin);
e7fd4179 DT	198	}
	199
	200	int dlm_rcom_names(struct dlm_ls ls, int nodeid, char last_name, int last_len)
	201	{
	202	struct dlm_rcom *rc;
	203	struct dlm_mhandle *mh;
	204	int error = 0, len = sizeof(struct dlm_rcom);
	205
faa0f267	206	ls->ls_recover_nodeid = nodeid;
e7fd4179 DT	207
	208	if (nodeid == dlm_our_nodeid()) {
	209	dlm_copy_master_names(ls, last_name, last_len,
	210	ls->ls_recover_buf + len,
68c817a1	211	dlm_config.ci_buffer_size - len, nodeid);
e7fd4179 DT	212	goto out;
	213	}
	214
	215	error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
	216	if (error)
	217	goto out;
	218	memcpy(rc->rc_buf, last_name, last_len);
98f176fb DT	219
98f176fb DT	220	allow_sync_reply(ls, &rc->rc_id);
68c817a1	221	memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
e7fd4179 DT	222
	223	send_rcom(ls, mh, rc);
	224
	225	error = dlm_wait_function(ls, &rcom_response);
98f176fb	226	disallow_sync_reply(ls);
e7fd4179 DT	227	out:
	228	return error;
	229	}
	230
	231	static void receive_rcom_names(struct dlm_ls ls, struct dlm_rcom rc_in)
	232	{
	233	struct dlm_rcom *rc;
	234	struct dlm_mhandle *mh;
38aa8b0c	235	int error, inlen, outlen, nodeid;
e7fd4179 DT	236
	237	nodeid = rc_in->rc_header.h_nodeid;
	238	inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
68c817a1	239	outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
e7fd4179 DT	240
	241	error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
	242	if (error)
	243	return;
4a99c3d9	244	rc->rc_id = rc_in->rc_id;
38aa8b0c	245	rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 DT	246
	247	dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
	248	nodeid);
	249	send_rcom(ls, mh, rc);
	250	}
	251
e7fd4179 DT	252	int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
	253	{
	254	struct dlm_rcom *rc;
	255	struct dlm_mhandle *mh;
	256	struct dlm_ls *ls = r->res_ls;
	257	int error;
	258
	259	error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
	260	&rc, &mh);
	261	if (error)
	262	goto out;
	263	memcpy(rc->rc_buf, r->res_name, r->res_length);
	264	rc->rc_id = (unsigned long) r;
	265
	266	send_rcom(ls, mh, rc);
	267	out:
	268	return error;
	269	}
	270
	271	static void receive_rcom_lookup(struct dlm_ls ls, struct dlm_rcom rc_in)
	272	{
	273	struct dlm_rcom *rc;
	274	struct dlm_mhandle *mh;
	275	int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid;
	276	int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
	277
	278	error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
	279	if (error)
	280	return;
	281
	282	error = dlm_dir_lookup(ls, nodeid, rc_in->rc_buf, len, &ret_nodeid);
	283	if (error)
	284	ret_nodeid = error;
	285	rc->rc_result = ret_nodeid;
	286	rc->rc_id = rc_in->rc_id;
38aa8b0c	287	rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 DT	288
	289	send_rcom(ls, mh, rc);
	290	}
	291
	292	static void receive_rcom_lookup_reply(struct dlm_ls ls, struct dlm_rcom rc_in)
	293	{
	294	dlm_recover_master_reply(ls, rc_in);
	295	}
	296
	297	static void pack_rcom_lock(struct dlm_rsb r, struct dlm_lkb lkb,
	298	struct rcom_lock *rl)
	299	{
	300	memset(rl, 0, sizeof(*rl));
	301
163a1859 AV	302	rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
	303	rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
	304	rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
	305	rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
	306	rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
e7fd4179 DT	307	rl->rl_rqmode = lkb->lkb_rqmode;
	308	rl->rl_grmode = lkb->lkb_grmode;
	309	rl->rl_status = lkb->lkb_status;
163a1859	310	rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
e7fd4179 DT	311
	312	if (lkb->lkb_bastaddr)
	313	rl->rl_asts \|= AST_BAST;
	314	if (lkb->lkb_astaddr)
	315	rl->rl_asts \|= AST_COMP;
	316
163a1859	317	rl->rl_namelen = cpu_to_le16(r->res_length);
e7fd4179 DT	318	memcpy(rl->rl_name, r->res_name, r->res_length);
	319
	320	/* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
	321	If so, receive_rcom_lock_args() won't take this copy. */
	322
	323	if (lkb->lkb_lvbptr)
	324	memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
	325	}
	326
	327	int dlm_send_rcom_lock(struct dlm_rsb r, struct dlm_lkb lkb)
	328	{
	329	struct dlm_ls *ls = r->res_ls;
	330	struct dlm_rcom *rc;
	331	struct dlm_mhandle *mh;
	332	struct rcom_lock *rl;
	333	int error, len = sizeof(struct rcom_lock);
	334
	335	if (lkb->lkb_lvbptr)
	336	len += ls->ls_lvblen;
	337
	338	error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
	339	if (error)
	340	goto out;
	341
	342	rl = (struct rcom_lock *) rc->rc_buf;
	343	pack_rcom_lock(r, lkb, rl);
	344	rc->rc_id = (unsigned long) r;
	345
	346	send_rcom(ls, mh, rc);
	347	out:
	348	return error;
	349	}
	350
	351	static void receive_rcom_lock(struct dlm_ls ls, struct dlm_rcom rc_in)
	352	{
	353	struct dlm_rcom *rc;
	354	struct dlm_mhandle *mh;
	355	int error, nodeid = rc_in->rc_header.h_nodeid;
	356
	357	dlm_recover_master_copy(ls, rc_in);
	358
	359	error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
	360	sizeof(struct rcom_lock), &rc, &mh);
	361	if (error)
	362	return;
	363
	364	/* We send back the same rcom_lock struct we received, but
	365	dlm_recover_master_copy() has filled in rl_remid and rl_result */
	366
	367	memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
	368	rc->rc_id = rc_in->rc_id;
38aa8b0c	369	rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 DT	370
	371	send_rcom(ls, mh, rc);
	372	}
	373
c36258b5 DT	374	/* If the lockspace doesn't exist then still send a status message
	375	back; it's possible that it just doesn't have its global_id yet. */
	376
	377	int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
e7fd4179 DT	378	{
e7fd4179 DT	379	struct dlm_rcom *rc;
1babdb45	380	struct rcom_config *rf;
e7fd4179 DT	381	struct dlm_mhandle *mh;
e7fd4179 DT	382	char *mb;
1babdb45	383	int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
e7fd4179	384
41684f95	385	mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb);
e7fd4179 DT	386	if (!mh)
	387	return -ENOBUFS;
	388	memset(mb, 0, mb_len);
	389
	390	rc = (struct dlm_rcom *) mb;
	391
	392	rc->rc_header.h_version = (DLM_HEADER_MAJOR \| DLM_HEADER_MINOR);
	393	rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace;
	394	rc->rc_header.h_nodeid = dlm_our_nodeid();
	395	rc->rc_header.h_length = mb_len;
	396	rc->rc_header.h_cmd = DLM_RCOM;
	397
	398	rc->rc_type = DLM_RCOM_STATUS_REPLY;
f5888750	399	rc->rc_id = rc_in->rc_id;
38aa8b0c	400	rc->rc_seq_reply = rc_in->rc_seq;
e7fd4179 DT	401	rc->rc_result = -ESRCH;
e7fd4179 DT	402
1babdb45 DT	403	rf = (struct rcom_config *) rc->rc_buf;
	404	rf->rf_lvblen = -1;
	405
e7fd4179 DT	406	dlm_rcom_out(rc);
	407	dlm_lowcomms_commit_buffer(mh);
	408
	409	return 0;
	410	}
	411
38aa8b0c DT	412	static int is_old_reply(struct dlm_ls ls, struct dlm_rcom rc)
	413	{
	414	uint64_t seq;
	415	int rv = 0;
	416
	417	switch (rc->rc_type) {
	418	case DLM_RCOM_STATUS_REPLY:
	419	case DLM_RCOM_NAMES_REPLY:
	420	case DLM_RCOM_LOOKUP_REPLY:
	421	case DLM_RCOM_LOCK_REPLY:
	422	spin_lock(&ls->ls_recover_lock);
	423	seq = ls->ls_recover_seq;
	424	spin_unlock(&ls->ls_recover_lock);
	425	if (rc->rc_seq_reply != seq) {
8ec68867	426	log_debug(ls, "ignoring old reply %x from %d "
38aa8b0c DT	427	"seq_reply %llx expect %llx",
	428	rc->rc_type, rc->rc_header.h_nodeid,
	429	(unsigned long long)rc->rc_seq_reply,
	430	(unsigned long long)seq);
	431	rv = 1;
	432	}
	433	}
	434	return rv;
	435	}
	436
c36258b5	437	/* Called by dlm_recv; corresponds to dlm_receive_message() but special
e7fd4179 DT	438	recovery-only comms are sent through here. */
e7fd4179 DT	439
c36258b5	440	void dlm_receive_rcom(struct dlm_ls ls, struct dlm_rcom rc, int nodeid)
e7fd4179	441	{
e7fd4179	442	if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
8ec68867	443	log_debug(ls, "ignoring recovery message %x from %d",
e7fd4179 DT	444	rc->rc_type, nodeid);
	445	goto out;
	446	}
	447
38aa8b0c DT	448	if (is_old_reply(ls, rc))
	449	goto out;
	450
e7fd4179 DT	451	switch (rc->rc_type) {
	452	case DLM_RCOM_STATUS:
	453	receive_rcom_status(ls, rc);
	454	break;
	455
	456	case DLM_RCOM_NAMES:
	457	receive_rcom_names(ls, rc);
	458	break;
	459
	460	case DLM_RCOM_LOOKUP:
	461	receive_rcom_lookup(ls, rc);
	462	break;
	463
	464	case DLM_RCOM_LOCK:
	465	receive_rcom_lock(ls, rc);
	466	break;
	467
	468	case DLM_RCOM_STATUS_REPLY:
dbcfc347	469	receive_sync_reply(ls, rc);
e7fd4179 DT	470	break;
	471
	472	case DLM_RCOM_NAMES_REPLY:
dbcfc347	473	receive_sync_reply(ls, rc);
e7fd4179 DT	474	break;
	475
	476	case DLM_RCOM_LOOKUP_REPLY:
	477	receive_rcom_lookup_reply(ls, rc);
	478	break;
	479
	480	case DLM_RCOM_LOCK_REPLY:
dbcfc347	481	dlm_recover_process_copy(ls, rc);
e7fd4179 DT	482	break;
	483
	484	default:
dbcfc347	485	log_error(ls, "receive_rcom bad type %d", rc->rc_type);
e7fd4179 DT	486	}
e7fd4179 DT	487	out:
c36258b5	488	return;
e7fd4179 DT	489	}
e7fd4179 DT	490