[net-next-2.6.git] / fs / ocfs2 / dlm / dlmconvert.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * dlmconvert.c
 *
 * underlying calls for lock conversion
 *
 * Copyright (C) 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 *
 */


#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/random.h>
#include <linux/blkdev.h>
#include <linux/socket.h>
#include <linux/inet.h>
#include <linux/spinlock.h>


#include "cluster/heartbeat.h"
#include "cluster/nodemanager.h"
#include "cluster/tcp.h"

#include "dlmapi.h"
#include "dlmcommon.h"

#include "dlmconvert.h"

#define MLOG_MASK_PREFIX ML_DLM
#include "cluster/masklog.h"

/* NOTE: __dlmconvert_master is the only function in here that
 * needs a spinlock held on entry (res->spinlock) and it is the
 * only one that holds a lock on exit (res->spinlock).
 * All other functions in here need no locks and drop all of
 * the locks that they acquire. */
static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
					   struct dlm_lock_resource *res,
					   struct dlm_lock *lock, int flags,
					   int type, int *call_ast,
					   int *kick_thread);
static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
					   struct dlm_lock_resource *res,
					   struct dlm_lock *lock, int flags, int type);

/*
 * this is only called directly by dlmlock(), and only when the
 * local node is the owner of the lockres
 * locking:
 *   caller needs:  none
 *   taken:         takes and drops res->spinlock
 *   held on exit:  none
 * returns: see __dlmconvert_master
 */
enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm,
				  struct dlm_lock_resource *res,
				  struct dlm_lock *lock, int flags, int type)
{
	int call_ast = 0, kick_thread = 0;
	enum dlm_status status;

	spin_lock(&res->spinlock);
	/* we are not in a network handler, this is fine */
	__dlm_wait_on_lockres(res);
	__dlm_lockres_reserve_ast(res);
	res->state |= DLM_LOCK_RES_IN_PROGRESS;

	status = __dlmconvert_master(dlm, res, lock, flags, type,
				     &call_ast, &kick_thread);

	res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
	spin_unlock(&res->spinlock);
	wake_up(&res->wq);
	if (status != DLM_NORMAL && status != DLM_NOTQUEUED)
		dlm_error(status);

	/* either queue the ast or release it */
	if (call_ast)
		dlm_queue_ast(dlm, lock);
	else
		dlm_lockres_release_ast(dlm, res);

	if (kick_thread)
		dlm_kick_thread(dlm, res);

	return status;
}

/* performs lock conversion at the lockres master site
 * locking:
 *   caller needs:  res->spinlock
 *   taken:         takes and drops lock->spinlock
 *   held on exit:  res->spinlock
 * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED
 *   call_ast: whether ast should be called for this lock
 *   kick_thread: whether dlm_kick_thread should be called
 */
static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
					   struct dlm_lock_resource *res,
					   struct dlm_lock *lock, int flags,
					   int type, int *call_ast,
					   int *kick_thread)
{
	enum dlm_status status = DLM_NORMAL;
	struct list_head *iter;
	struct dlm_lock *tmplock=NULL;

	assert_spin_locked(&res->spinlock);

	mlog_entry("type=%d, convert_type=%d, new convert_type=%d\n",
		   lock->ml.type, lock->ml.convert_type, type);

	spin_lock(&lock->spinlock);

	/* already converting? */
	if (lock->ml.convert_type != LKM_IVMODE) {
		mlog(ML_ERROR, "attempted to convert a lock with a lock "
		     "conversion pending\n");
		status = DLM_DENIED;
		goto unlock_exit;
	}

	/* must be on grant queue to convert */
	if (!dlm_lock_on_list(&res->granted, lock)) {
		mlog(ML_ERROR, "attempted to convert a lock not on grant "
		     "queue\n");
		status = DLM_DENIED;
		goto unlock_exit;
	}

	if (flags & LKM_VALBLK) {
		switch (lock->ml.type) {
			case LKM_EXMODE:
				/* EX + LKM_VALBLK + convert == set lvb */
				mlog(0, "will set lvb: converting %s->%s\n",
				     dlm_lock_mode_name(lock->ml.type),
				     dlm_lock_mode_name(type));
				lock->lksb->flags |= DLM_LKSB_PUT_LVB;
				break;
			case LKM_PRMODE:
			case LKM_NLMODE:
				/* refetch if new level is not NL */
				if (type > LKM_NLMODE) {
					mlog(0, "will fetch new value into "
					     "lvb: converting %s->%s\n",
					     dlm_lock_mode_name(lock->ml.type),
					     dlm_lock_mode_name(type));
					lock->lksb->flags |= DLM_LKSB_GET_LVB;
				} else {
					mlog(0, "will NOT fetch new value "
					     "into lvb: converting %s->%s\n",
					     dlm_lock_mode_name(lock->ml.type),
					     dlm_lock_mode_name(type));
					flags &= ~(LKM_VALBLK);
				}
				break;
		}
	}


	/* in-place downconvert? */
	if (type <= lock->ml.type)
		goto grant;

	/* upconvert from here on */
	status = DLM_NORMAL;
	list_for_each(iter, &res->granted) {
		tmplock = list_entry(iter, struct dlm_lock, list);
		if (tmplock == lock)
			continue;
		if (!dlm_lock_compatible(tmplock->ml.type, type))
			goto switch_queues;
	}

	list_for_each(iter, &res->converting) {
		tmplock = list_entry(iter, struct dlm_lock, list);
		if (!dlm_lock_compatible(tmplock->ml.type, type))
			goto switch_queues;
		/* existing conversion requests take precedence */
		if (!dlm_lock_compatible(tmplock->ml.convert_type, type))
			goto switch_queues;
	}

	/* fall thru to grant */

grant:
	mlog(0, "res %.*s, granting %s lock\n", res->lockname.len,
	     res->lockname.name, dlm_lock_mode_name(type));
	/* immediately grant the new lock type */
	lock->lksb->status = DLM_NORMAL;
	if (lock->ml.node == dlm->node_num)
		mlog(0, "doing in-place convert for nonlocal lock\n");
	lock->ml.type = type;
	if (lock->lksb->flags & DLM_LKSB_PUT_LVB)
		memcpy(res->lvb, lock->lksb->lvb, DLM_LVB_LEN);

	status = DLM_NORMAL;
	*call_ast = 1;
	goto unlock_exit;

switch_queues:
	if (flags & LKM_NOQUEUE) {
		mlog(0, "failed to convert NOQUEUE lock %.*s from "
		     "%d to %d...\n", res->lockname.len, res->lockname.name,
		     lock->ml.type, type);
		status = DLM_NOTQUEUED;
		goto unlock_exit;
	}
	mlog(0, "res %.*s, queueing...\n", res->lockname.len,
	     res->lockname.name);

	lock->ml.convert_type = type;
	/* do not alter lock refcount.  switching lists. */
	list_move_tail(&lock->list, &res->converting);

unlock_exit:
	spin_unlock(&lock->spinlock);
	if (status == DLM_DENIED) {
		__dlm_print_one_lock_resource(res);
	}
	if (status == DLM_NORMAL)
		*kick_thread = 1;
	return status;
}

void dlm_revert_pending_convert(struct dlm_lock_resource *res,
				struct dlm_lock *lock)
{
	/* do not alter lock refcount.  switching lists. */
	list_move_tail(&lock->list, &res->granted);
	lock->ml.convert_type = LKM_IVMODE;
	lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
}

/* messages the master site to do lock conversion
 * locking:
 *   caller needs:  none
 *   taken:         takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS
 *   held on exit:  none
 * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node
 */
enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
				  struct dlm_lock_resource *res,
				  struct dlm_lock *lock, int flags, int type)
{
	enum dlm_status status;

	mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type,
	     lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS);

	spin_lock(&res->spinlock);
	if (res->state & DLM_LOCK_RES_RECOVERING) {
		mlog(0, "bailing out early since res is RECOVERING "
		     "on secondary queue\n");
		/* __dlm_print_one_lock_resource(res); */
		status = DLM_RECOVERING;
		goto bail;
	}
	/* will exit this call with spinlock held */
	__dlm_wait_on_lockres(res);

	if (lock->ml.convert_type != LKM_IVMODE) {
		__dlm_print_one_lock_resource(res);
		mlog(ML_ERROR, "converting a remote lock that is already "
		     "converting! (cookie=%u:%llu, conv=%d)\n",
		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
		     lock->ml.convert_type);
		status = DLM_DENIED;
		goto bail;
	}
	res->state |= DLM_LOCK_RES_IN_PROGRESS;
	/* move lock to local convert queue */
	/* do not alter lock refcount.  switching lists. */
	list_move_tail(&lock->list, &res->converting);
	lock->convert_pending = 1;
	lock->ml.convert_type = type;

	if (flags & LKM_VALBLK) {
		if (lock->ml.type == LKM_EXMODE) {
			flags |= LKM_PUT_LVB;
			lock->lksb->flags |= DLM_LKSB_PUT_LVB;
		} else {
			if (lock->ml.convert_type == LKM_NLMODE)
				flags &= ~LKM_VALBLK;
			else {
				flags |= LKM_GET_LVB;
				lock->lksb->flags |= DLM_LKSB_GET_LVB;
			}
		}
	}
	spin_unlock(&res->spinlock);

	/* no locks held here.
	 * need to wait for a reply as to whether it got queued or not. */
	status = dlm_send_remote_convert_request(dlm, res, lock, flags, type);

	spin_lock(&res->spinlock);
	res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
	lock->convert_pending = 0;
	/* if it failed, move it back to granted queue */
	if (status != DLM_NORMAL) {
		if (status != DLM_NOTQUEUED)
			dlm_error(status);
		dlm_revert_pending_convert(res, lock);
	}
bail:
	spin_unlock(&res->spinlock);

	/* TODO: should this be a wake_one? */
	/* wake up any IN_PROGRESS waiters */
	wake_up(&res->wq);

	return status;
}

/* sends DLM_CONVERT_LOCK_MSG to master site
 * locking:
 *   caller needs:  none
 *   taken:         none
 *   held on exit:  none
 * returns: DLM_NOLOCKMGR, status from remote node
 */
static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
					   struct dlm_lock_resource *res,
					   struct dlm_lock *lock, int flags, int type)
{
	struct dlm_convert_lock convert;
	int tmpret;
	enum dlm_status ret;
	int status = 0;
	struct kvec vec[2];
	size_t veclen = 1;

	mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);

	memset(&convert, 0, sizeof(struct dlm_convert_lock));
	convert.node_idx = dlm->node_num;
	convert.requested_type = type;
	convert.cookie = lock->ml.cookie;
	convert.namelen = res->lockname.len;
	convert.flags = cpu_to_be32(flags);
	memcpy(convert.name, res->lockname.name, convert.namelen);

	vec[0].iov_len = sizeof(struct dlm_convert_lock);
	vec[0].iov_base = &convert;

	if (flags & LKM_PUT_LVB) {
		/* extra data to send if we are updating lvb */
		vec[1].iov_len = DLM_LVB_LEN;
		vec[1].iov_base = lock->lksb->lvb;
		veclen++;
	}

	tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key,
					vec, veclen, res->owner, &status);
	if (tmpret >= 0) {
		// successfully sent and received
		ret = status;  // this is already a dlm_status
		if (ret == DLM_RECOVERING) {
			mlog(0, "node %u returned DLM_RECOVERING from convert "
			     "message!\n", res->owner);
		} else if (ret == DLM_MIGRATING) {
			mlog(0, "node %u returned DLM_MIGRATING from convert "
			     "message!\n", res->owner);
		} else if (ret == DLM_FORWARD) {
			mlog(0, "node %u returned DLM_FORWARD from convert "
			     "message!\n", res->owner);
		} else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED)
			dlm_error(ret);
	} else {
		mlog_errno(tmpret);
		if (dlm_is_host_down(tmpret)) {
			/* instead of logging the same network error over
			 * and over, sleep here and wait for the heartbeat
			 * to notice the node is dead.  times out after 5s. */
			dlm_wait_for_node_death(dlm, res->owner,
						DLM_NODE_DEATH_WAIT_MAX);
			ret = DLM_RECOVERING;
			mlog(0, "node %u died so returning DLM_RECOVERING "
			     "from convert message!\n", res->owner);
		} else {
			ret = dlm_err_to_dlm_status(tmpret);
		}
	}

	return ret;
}

/* handler for DLM_CONVERT_LOCK_MSG on master site
 * locking:
 *   caller needs:  none
 *   taken:         takes and drop res->spinlock
 *   held on exit:  none
 * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS,
 *          status from __dlmconvert_master
 */
int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
			     void **ret_data)
{
	struct dlm_ctxt *dlm = data;
	struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf;
	struct dlm_lock_resource *res = NULL;
	struct list_head *iter;
	struct dlm_lock *lock = NULL;
	struct dlm_lockstatus *lksb;
	enum dlm_status status = DLM_NORMAL;
	u32 flags;
	int call_ast = 0, kick_thread = 0, ast_reserved = 0, wake = 0;

	if (!dlm_grab(dlm)) {
		dlm_error(DLM_REJECTED);
		return DLM_REJECTED;
	}

	mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
			"Domain %s not fully joined!\n", dlm->name);

	if (cnv->namelen > DLM_LOCKID_NAME_MAX) {
		status = DLM_IVBUFLEN;
		dlm_error(status);
		goto leave;
	}

	flags = be32_to_cpu(cnv->flags);

	if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
	     (LKM_PUT_LVB|LKM_GET_LVB)) {
		mlog(ML_ERROR, "both PUT and GET lvb specified\n");
		status = DLM_BADARGS;
		goto leave;
	}

	mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
	     (flags & LKM_GET_LVB ? "get lvb" : "none"));

	status = DLM_IVLOCKID;
	res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen);
	if (!res) {
		dlm_error(status);
		goto leave;
	}

	spin_lock(&res->spinlock);
	status = __dlm_lockres_state_to_status(res);
	if (status != DLM_NORMAL) {
		spin_unlock(&res->spinlock);
		dlm_error(status);
		goto leave;
	}
	list_for_each(iter, &res->granted) {
		lock = list_entry(iter, struct dlm_lock, list);
		if (lock->ml.cookie == cnv->cookie &&
		    lock->ml.node == cnv->node_idx) {
			dlm_lock_get(lock);
			break;
		}
		lock = NULL;
	}
	spin_unlock(&res->spinlock);
	if (!lock) {
		status = DLM_IVLOCKID;
		mlog(ML_ERROR, "did not find lock to convert on grant queue! "
			       "cookie=%u:%llu\n",
		     dlm_get_lock_cookie_node(be64_to_cpu(cnv->cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(cnv->cookie)));
		dlm_print_one_lock_resource(res);
		goto leave;
	}

	/* found the lock */
	lksb = lock->lksb;

	/* see if caller needed to get/put lvb */
	if (flags & LKM_PUT_LVB) {
		BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
		lksb->flags |= DLM_LKSB_PUT_LVB;
		memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN);
	} else if (flags & LKM_GET_LVB) {
		BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
		lksb->flags |= DLM_LKSB_GET_LVB;
	}

	spin_lock(&res->spinlock);
	status = __dlm_lockres_state_to_status(res);
	if (status == DLM_NORMAL) {
		__dlm_lockres_reserve_ast(res);
		ast_reserved = 1;
		res->state |= DLM_LOCK_RES_IN_PROGRESS;
		status = __dlmconvert_master(dlm, res, lock, flags,
					     cnv->requested_type,
					     &call_ast, &kick_thread);
		res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
		wake = 1;
	}
	spin_unlock(&res->spinlock);
	if (wake)
		wake_up(&res->wq);

	if (status != DLM_NORMAL) {
		if (status != DLM_NOTQUEUED)
			dlm_error(status);
		lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
	}

leave:
	if (lock)
		dlm_lock_put(lock);

	/* either queue the ast or release it, if reserved */
	if (call_ast)
		dlm_queue_ast(dlm, lock);
	else if (ast_reserved)
		dlm_lockres_release_ast(dlm, res);

	if (kick_thread)
		dlm_kick_thread(dlm, res);

	if (res)
		dlm_lockres_put(res);

	dlm_put(dlm);

	return status;
}
Commit	Line	Data
6714d8e8 KH	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* dlmconvert.c
	5	*
	6	* underlying calls for lock conversion
	7	*
	8	* Copyright (C) 2004 Oracle. All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public
	12	* License as published by the Free Software Foundation; either
	13	* version 2 of the License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public
	21	* License along with this program; if not, write to the
	22	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	23	* Boston, MA 021110-1307, USA.
	24	*
	25	*/
	26
	27
	28	#include <linux/module.h>
	29	#include <linux/fs.h>
	30	#include <linux/types.h>
6714d8e8	31	#include <linux/highmem.h>
6714d8e8 KH	32	#include <linux/init.h>
	33	#include <linux/sysctl.h>
	34	#include <linux/random.h>
	35	#include <linux/blkdev.h>
	36	#include <linux/socket.h>
	37	#include <linux/inet.h>
	38	#include <linux/spinlock.h>
	39
	40
	41	#include "cluster/heartbeat.h"
	42	#include "cluster/nodemanager.h"
	43	#include "cluster/tcp.h"
	44
	45	#include "dlmapi.h"
	46	#include "dlmcommon.h"
	47
	48	#include "dlmconvert.h"
	49
	50	#define MLOG_MASK_PREFIX ML_DLM
	51	#include "cluster/masklog.h"
	52
	53	/* NOTE: __dlmconvert_master is the only function in here that
	54	* needs a spinlock held on entry (res->spinlock) and it is the
	55	* only one that holds a lock on exit (res->spinlock).
	56	* All other functions in here need no locks and drop all of
	57	* the locks that they acquire. */
	58	static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
	59	struct dlm_lock_resource *res,
	60	struct dlm_lock *lock, int flags,
	61	int type, int *call_ast,
	62	int *kick_thread);
	63	static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
	64	struct dlm_lock_resource *res,
	65	struct dlm_lock *lock, int flags, int type);
	66
	67	/*
	68	* this is only called directly by dlmlock(), and only when the
	69	* local node is the owner of the lockres
	70	* locking:
	71	* caller needs: none
	72	* taken: takes and drops res->spinlock
	73	* held on exit: none
	74	* returns: see __dlmconvert_master
	75	*/
	76	enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm,
	77	struct dlm_lock_resource *res,
	78	struct dlm_lock *lock, int flags, int type)
	79	{
	80	int call_ast = 0, kick_thread = 0;
	81	enum dlm_status status;
	82
	83	spin_lock(&res->spinlock);
	84	/* we are not in a network handler, this is fine */
	85	__dlm_wait_on_lockres(res);
	86	__dlm_lockres_reserve_ast(res);
	87	res->state \|= DLM_LOCK_RES_IN_PROGRESS;
	88
	89	status = __dlmconvert_master(dlm, res, lock, flags, type,
	90	&call_ast, &kick_thread);
	91
	92	res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
	93	spin_unlock(&res->spinlock);
	94	wake_up(&res->wq);
	95	if (status != DLM_NORMAL && status != DLM_NOTQUEUED)
96	dlm_error(status);
97
98	/* either queue the ast or release it */
99	if (call_ast)
100	dlm_queue_ast(dlm, lock);
101	else
102	dlm_lockres_release_ast(dlm, res);
103
104	if (kick_thread)
105	dlm_kick_thread(dlm, res);
106
107	return status;
108	}
109
110	/* performs lock conversion at the lockres master site
111	* locking:
112	* caller needs: res->spinlock
113	* taken: takes and drops lock->spinlock
114	* held on exit: res->spinlock
115	* returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED
116	* call_ast: whether ast should be called for this lock
117	* kick_thread: whether dlm_kick_thread should be called
118	*/
119	static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
120	struct dlm_lock_resource *res,
121	struct dlm_lock *lock, int flags,
122	int type, int *call_ast,
123	int *kick_thread)
124	{
125	enum dlm_status status = DLM_NORMAL;
126	struct list_head *iter;
127	struct dlm_lock *tmplock=NULL;
128
129	assert_spin_locked(&res->spinlock);
130
131	mlog_entry("type=%d, convert_type=%d, new convert_type=%d\n",
132	lock->ml.type, lock->ml.convert_type, type);
133
134	spin_lock(&lock->spinlock);
135
136	/* already converting? */
137	if (lock->ml.convert_type != LKM_IVMODE) {
138	mlog(ML_ERROR, "attempted to convert a lock with a lock "
139	"conversion pending\n");
140	status = DLM_DENIED;
141	goto unlock_exit;
142	}
143
144	/* must be on grant queue to convert */
145	if (!dlm_lock_on_list(&res->granted, lock)) {
146	mlog(ML_ERROR, "attempted to convert a lock not on grant "
147	"queue\n");
148	status = DLM_DENIED;
149	goto unlock_exit;
150	}
151
152	if (flags & LKM_VALBLK) {
153	switch (lock->ml.type) {
154	case LKM_EXMODE:
155	/* EX + LKM_VALBLK + convert == set lvb */
156	mlog(0, "will set lvb: converting %s->%s\n",
157	dlm_lock_mode_name(lock->ml.type),
158	dlm_lock_mode_name(type));
159	lock->lksb->flags \|= DLM_LKSB_PUT_LVB;
160	break;
161	case LKM_PRMODE:
162	case LKM_NLMODE:
163	/* refetch if new level is not NL */
164	if (type > LKM_NLMODE) {
165	mlog(0, "will fetch new value into "
166	"lvb: converting %s->%s\n",
167	dlm_lock_mode_name(lock->ml.type),
168	dlm_lock_mode_name(type));
169	lock->lksb->flags \|= DLM_LKSB_GET_LVB;
170	} else {
171	mlog(0, "will NOT fetch new value "
172	"into lvb: converting %s->%s\n",
173	dlm_lock_mode_name(lock->ml.type),
174	dlm_lock_mode_name(type));
175	flags &= ~(LKM_VALBLK);
176	}
177	break;
178	}
179	}
180
181
182	/* in-place downconvert? */
183	if (type <= lock->ml.type)
184	goto grant;
185
186	/* upconvert from here on */
187	status = DLM_NORMAL;
188	list_for_each(iter, &res->granted) {
189	tmplock = list_entry(iter, struct dlm_lock, list);
190	if (tmplock == lock)
191	continue;
192	if (!dlm_lock_compatible(tmplock->ml.type, type))
193	goto switch_queues;
194	}
195
196	list_for_each(iter, &res->converting) {
197	tmplock = list_entry(iter, struct dlm_lock, list);
198	if (!dlm_lock_compatible(tmplock->ml.type, type))
199	goto switch_queues;
200	/* existing conversion requests take precedence */
201	if (!dlm_lock_compatible(tmplock->ml.convert_type, type))
202	goto switch_queues;
203	}
204
205	/* fall thru to grant */
206
207	grant:
208	mlog(0, "res %.*s, granting %s lock\n", res->lockname.len,
209	res->lockname.name, dlm_lock_mode_name(type));
210	/* immediately grant the new lock type */
211	lock->lksb->status = DLM_NORMAL;
212	if (lock->ml.node == dlm->node_num)
213	mlog(0, "doing in-place convert for nonlocal lock\n");
214	lock->ml.type = type;
c0a8520c MF	215	if (lock->lksb->flags & DLM_LKSB_PUT_LVB)
	216	memcpy(res->lvb, lock->lksb->lvb, DLM_LVB_LEN);
	217
6714d8e8 KH	218	status = DLM_NORMAL;
	219	*call_ast = 1;
	220	goto unlock_exit;
	221
	222	switch_queues:
	223	if (flags & LKM_NOQUEUE) {
	224	mlog(0, "failed to convert NOQUEUE lock %.*s from "
	225	"%d to %d...\n", res->lockname.len, res->lockname.name,
	226	lock->ml.type, type);
	227	status = DLM_NOTQUEUED;
	228	goto unlock_exit;
	229	}
	230	mlog(0, "res %.*s, queueing...\n", res->lockname.len,
	231	res->lockname.name);
	232
	233	lock->ml.convert_type = type;
	234	/* do not alter lock refcount. switching lists. */
f116629d	235	list_move_tail(&lock->list, &res->converting);
6714d8e8 KH	236
	237	unlock_exit:
	238	spin_unlock(&lock->spinlock);
	239	if (status == DLM_DENIED) {
	240	__dlm_print_one_lock_resource(res);
	241	}
	242	if (status == DLM_NORMAL)
	243	*kick_thread = 1;
	244	return status;
	245	}
	246
	247	void dlm_revert_pending_convert(struct dlm_lock_resource *res,
	248	struct dlm_lock *lock)
	249	{
	250	/* do not alter lock refcount. switching lists. */
f116629d	251	list_move_tail(&lock->list, &res->granted);
6714d8e8 KH	252	lock->ml.convert_type = LKM_IVMODE;
	253	lock->lksb->flags &= ~(DLM_LKSB_GET_LVB\|DLM_LKSB_PUT_LVB);
	254	}
	255
	256	/* messages the master site to do lock conversion
	257	* locking:
	258	* caller needs: none
	259	* taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS
	260	* held on exit: none
	261	* returns: DLM_NORMAL, DLM_RECOVERING, status from remote node
	262	*/
	263	enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
	264	struct dlm_lock_resource *res,
	265	struct dlm_lock *lock, int flags, int type)
	266	{
	267	enum dlm_status status;
	268
	269	mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type,
	270	lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS);
	271
	272	spin_lock(&res->spinlock);
	273	if (res->state & DLM_LOCK_RES_RECOVERING) {
	274	mlog(0, "bailing out early since res is RECOVERING "
	275	"on secondary queue\n");
	276	/* __dlm_print_one_lock_resource(res); */
	277	status = DLM_RECOVERING;
	278	goto bail;
	279	}
	280	/* will exit this call with spinlock held */
	281	__dlm_wait_on_lockres(res);
	282
	283	if (lock->ml.convert_type != LKM_IVMODE) {
	284	__dlm_print_one_lock_resource(res);
	285	mlog(ML_ERROR, "converting a remote lock that is already "
29004858	286	"converting! (cookie=%u:%llu, conv=%d)\n",
74aa2585 KH	287	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
74aa2585 KH	288	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
29004858	289	lock->ml.convert_type);
6714d8e8 KH	290	status = DLM_DENIED;
	291	goto bail;
	292	}
	293	res->state \|= DLM_LOCK_RES_IN_PROGRESS;
	294	/* move lock to local convert queue */
	295	/* do not alter lock refcount. switching lists. */
f116629d	296	list_move_tail(&lock->list, &res->converting);
6714d8e8 KH	297	lock->convert_pending = 1;
	298	lock->ml.convert_type = type;
	299
	300	if (flags & LKM_VALBLK) {
	301	if (lock->ml.type == LKM_EXMODE) {
	302	flags \|= LKM_PUT_LVB;
	303	lock->lksb->flags \|= DLM_LKSB_PUT_LVB;
	304	} else {
	305	if (lock->ml.convert_type == LKM_NLMODE)
	306	flags &= ~LKM_VALBLK;
	307	else {
	308	flags \|= LKM_GET_LVB;
	309	lock->lksb->flags \|= DLM_LKSB_GET_LVB;
	310	}
	311	}
	312	}
	313	spin_unlock(&res->spinlock);
	314
	315	/* no locks held here.
	316	* need to wait for a reply as to whether it got queued or not. */
	317	status = dlm_send_remote_convert_request(dlm, res, lock, flags, type);
	318
	319	spin_lock(&res->spinlock);
	320	res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
	321	lock->convert_pending = 0;
	322	/* if it failed, move it back to granted queue */
	323	if (status != DLM_NORMAL) {
	324	if (status != DLM_NOTQUEUED)
	325	dlm_error(status);
	326	dlm_revert_pending_convert(res, lock);
	327	}
	328	bail:
	329	spin_unlock(&res->spinlock);
	330
	331	/* TODO: should this be a wake_one? */
	332	/* wake up any IN_PROGRESS waiters */
	333	wake_up(&res->wq);
	334
	335	return status;
	336	}
	337
	338	/* sends DLM_CONVERT_LOCK_MSG to master site
	339	* locking:
	340	* caller needs: none
	341	* taken: none
	342	* held on exit: none
	343	* returns: DLM_NOLOCKMGR, status from remote node
	344	*/
	345	static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
	346	struct dlm_lock_resource *res,
	347	struct dlm_lock *lock, int flags, int type)
	348	{
	349	struct dlm_convert_lock convert;
	350	int tmpret;
	351	enum dlm_status ret;
	352	int status = 0;
	353	struct kvec vec[2];
	354	size_t veclen = 1;
	355
	356	mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
	357
	358	memset(&convert, 0, sizeof(struct dlm_convert_lock));
	359	convert.node_idx = dlm->node_num;
	360	convert.requested_type = type;
361	convert.cookie = lock->ml.cookie;
362	convert.namelen = res->lockname.len;
363	convert.flags = cpu_to_be32(flags);
364	memcpy(convert.name, res->lockname.name, convert.namelen);
365
366	vec[0].iov_len = sizeof(struct dlm_convert_lock);
367	vec[0].iov_base = &convert;
368
369	if (flags & LKM_PUT_LVB) {
370	/* extra data to send if we are updating lvb */
371	vec[1].iov_len = DLM_LVB_LEN;
372	vec[1].iov_base = lock->lksb->lvb;
373	veclen++;
374	}
375
376	tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key,
377	vec, veclen, res->owner, &status);
378	if (tmpret >= 0) {
379	// successfully sent and received
380	ret = status; // this is already a dlm_status
381	if (ret == DLM_RECOVERING) {
382	mlog(0, "node %u returned DLM_RECOVERING from convert "
383	"message!\n", res->owner);
384	} else if (ret == DLM_MIGRATING) {
385	mlog(0, "node %u returned DLM_MIGRATING from convert "
386	"message!\n", res->owner);
387	} else if (ret == DLM_FORWARD) {
388	mlog(0, "node %u returned DLM_FORWARD from convert "
389	"message!\n", res->owner);
390	} else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED)
391	dlm_error(ret);
392	} else {
393	mlog_errno(tmpret);
394	if (dlm_is_host_down(tmpret)) {
44465a7d KH	395	/* instead of logging the same network error over
	396	* and over, sleep here and wait for the heartbeat
	397	* to notice the node is dead. times out after 5s. */
2bd63216	398	dlm_wait_for_node_death(dlm, res->owner,
44465a7d	399	DLM_NODE_DEATH_WAIT_MAX);
6714d8e8 KH	400	ret = DLM_RECOVERING;
	401	mlog(0, "node %u died so returning DLM_RECOVERING "
	402	"from convert message!\n", res->owner);
	403	} else {
	404	ret = dlm_err_to_dlm_status(tmpret);
	405	}
	406	}
	407
	408	return ret;
	409	}
	410
	411	/* handler for DLM_CONVERT_LOCK_MSG on master site
	412	* locking:
	413	* caller needs: none
	414	* taken: takes and drop res->spinlock
	415	* held on exit: none
	416	* returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS,
	417	* status from __dlmconvert_master
	418	*/
d74c9803 KH	419	int dlm_convert_lock_handler(struct o2net_msg msg, u32 len, void data,
d74c9803 KH	420	void **ret_data)
6714d8e8 KH	421	{
	422	struct dlm_ctxt *dlm = data;
	423	struct dlm_convert_lock cnv = (struct dlm_convert_lock )msg->buf;
	424	struct dlm_lock_resource *res = NULL;
	425	struct list_head *iter;
	426	struct dlm_lock *lock = NULL;
	427	struct dlm_lockstatus *lksb;
	428	enum dlm_status status = DLM_NORMAL;
	429	u32 flags;
a6fa3640	430	int call_ast = 0, kick_thread = 0, ast_reserved = 0, wake = 0;
6714d8e8 KH	431
	432	if (!dlm_grab(dlm)) {
	433	dlm_error(DLM_REJECTED);
	434	return DLM_REJECTED;
	435	}
	436
	437	mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
	438	"Domain %s not fully joined!\n", dlm->name);
	439
	440	if (cnv->namelen > DLM_LOCKID_NAME_MAX) {
	441	status = DLM_IVBUFLEN;
	442	dlm_error(status);
	443	goto leave;
	444	}
	445
	446	flags = be32_to_cpu(cnv->flags);
	447
	448	if ((flags & (LKM_PUT_LVB\|LKM_GET_LVB)) ==
	449	(LKM_PUT_LVB\|LKM_GET_LVB)) {
	450	mlog(ML_ERROR, "both PUT and GET lvb specified\n");
	451	status = DLM_BADARGS;
	452	goto leave;
	453	}
	454
	455	mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
	456	(flags & LKM_GET_LVB ? "get lvb" : "none"));
	457
	458	status = DLM_IVLOCKID;
	459	res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen);
	460	if (!res) {
	461	dlm_error(status);
	462	goto leave;
	463	}
	464
	465	spin_lock(&res->spinlock);
b220532a KH	466	status = __dlm_lockres_state_to_status(res);
	467	if (status != DLM_NORMAL) {
	468	spin_unlock(&res->spinlock);
	469	dlm_error(status);
	470	goto leave;
	471	}
6714d8e8 KH	472	list_for_each(iter, &res->granted) {
	473	lock = list_entry(iter, struct dlm_lock, list);
	474	if (lock->ml.cookie == cnv->cookie &&
	475	lock->ml.node == cnv->node_idx) {
	476	dlm_lock_get(lock);
	477	break;
	478	}
	479	lock = NULL;
	480	}
	481	spin_unlock(&res->spinlock);
	482	if (!lock) {
	483	status = DLM_IVLOCKID;
90aaaf1c KH	484	mlog(ML_ERROR, "did not find lock to convert on grant queue! "
90aaaf1c KH	485	"cookie=%u:%llu\n",
74aa2585 KH	486	dlm_get_lock_cookie_node(be64_to_cpu(cnv->cookie)),
74aa2585 KH	487	dlm_get_lock_cookie_seq(be64_to_cpu(cnv->cookie)));
2af37ce8	488	dlm_print_one_lock_resource(res);
6714d8e8 KH	489	goto leave;
	490	}
	491
	492	/* found the lock */
	493	lksb = lock->lksb;
	494
	495	/* see if caller needed to get/put lvb */
	496	if (flags & LKM_PUT_LVB) {
	497	BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB\|DLM_LKSB_GET_LVB));
	498	lksb->flags \|= DLM_LKSB_PUT_LVB;
	499	memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN);
	500	} else if (flags & LKM_GET_LVB) {
	501	BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB\|DLM_LKSB_GET_LVB));
	502	lksb->flags \|= DLM_LKSB_GET_LVB;
	503	}
	504
	505	spin_lock(&res->spinlock);
	506	status = __dlm_lockres_state_to_status(res);
	507	if (status == DLM_NORMAL) {
	508	__dlm_lockres_reserve_ast(res);
e2b5e450	509	ast_reserved = 1;
6714d8e8 KH	510	res->state \|= DLM_LOCK_RES_IN_PROGRESS;
	511	status = __dlmconvert_master(dlm, res, lock, flags,
	512	cnv->requested_type,
	513	&call_ast, &kick_thread);
	514	res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
a6fa3640	515	wake = 1;
6714d8e8 KH	516	}
6714d8e8 KH	517	spin_unlock(&res->spinlock);
a6fa3640 KH	518	if (wake)
a6fa3640 KH	519	wake_up(&res->wq);
6714d8e8 KH	520
	521	if (status != DLM_NORMAL) {
	522	if (status != DLM_NOTQUEUED)
	523	dlm_error(status);
	524	lksb->flags &= ~(DLM_LKSB_GET_LVB\|DLM_LKSB_PUT_LVB);
	525	}
	526
	527	leave:
90aaaf1c	528	if (lock)
6714d8e8 KH	529	dlm_lock_put(lock);
6714d8e8 KH	530
e2b5e450	531	/* either queue the ast or release it, if reserved */
6714d8e8 KH	532	if (call_ast)
6714d8e8 KH	533	dlm_queue_ast(dlm, lock);
e2b5e450	534	else if (ast_reserved)
6714d8e8 KH	535	dlm_lockres_release_ast(dlm, res);
	536
	537	if (kick_thread)
	538	dlm_kick_thread(dlm, res);
	539
	540	if (res)
	541	dlm_lockres_put(res);
	542
	543	dlm_put(dlm);
	544
	545	return status;
	546	}