[linux-block.git] / fs / ocfs2 / dlm / dlmast.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * dlmast.c
 *
 * AST and BAST functionality for local and remote nodes
 *
 * Copyright (C) 2004 Oracle.  All rights reserved.
 */


#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"

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

static void dlm_update_lvb(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
			   struct dlm_lock *lock);
static int dlm_should_cancel_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);

/* Should be called as an ast gets queued to see if the new
 * lock level will obsolete a pending bast.
 * For example, if dlm_thread queued a bast for an EX lock that
 * was blocking another EX, but before sending the bast the
 * lock owner downconverted to NL, the bast is now obsolete.
 * Only the ast should be sent.
 * This is needed because the lock and convert paths can queue
 * asts out-of-band (not waiting for dlm_thread) in order to
 * allow for LKM_NOQUEUE to get immediate responses. */
static int dlm_should_cancel_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
{
	assert_spin_locked(&dlm->ast_lock);
	assert_spin_locked(&lock->spinlock);

	if (lock->ml.highest_blocked == LKM_IVMODE)
		return 0;
	BUG_ON(lock->ml.highest_blocked == LKM_NLMODE);

	if (lock->bast_pending &&
	    list_empty(&lock->bast_list))
		/* old bast already sent, ok */
		return 0;

	if (lock->ml.type == LKM_EXMODE)
		/* EX blocks anything left, any bast still valid */
		return 0;
	else if (lock->ml.type == LKM_NLMODE)
		/* NL blocks nothing, no reason to send any bast, cancel it */
		return 1;
	else if (lock->ml.highest_blocked != LKM_EXMODE)
		/* PR only blocks EX */
		return 1;

	return 0;
}

void __dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
{
	struct dlm_lock_resource *res;

	BUG_ON(!dlm);
	BUG_ON(!lock);

	res = lock->lockres;

	assert_spin_locked(&dlm->ast_lock);

	if (!list_empty(&lock->ast_list)) {
		mlog(ML_ERROR, "%s: res %.*s, lock %u:%llu, "
		     "AST list not empty, pending %d, newlevel %d\n",
		     dlm->name, res->lockname.len, res->lockname.name,
		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
		     lock->ast_pending, lock->ml.type);
		BUG();
	}
	if (lock->ast_pending)
		mlog(0, "%s: res %.*s, lock %u:%llu, AST getting flushed\n",
		     dlm->name, res->lockname.len, res->lockname.name,
		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));

	/* putting lock on list, add a ref */
	dlm_lock_get(lock);
	spin_lock(&lock->spinlock);

	/* check to see if this ast obsoletes the bast */
	if (dlm_should_cancel_bast(dlm, lock)) {
		mlog(0, "%s: res %.*s, lock %u:%llu, Cancelling BAST\n",
		     dlm->name, res->lockname.len, res->lockname.name,
		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));
		lock->bast_pending = 0;
		list_del_init(&lock->bast_list);
		lock->ml.highest_blocked = LKM_IVMODE;
		/* removing lock from list, remove a ref.  guaranteed
		 * this won't be the last ref because of the get above,
		 * so res->spinlock will not be taken here */
		dlm_lock_put(lock);
		/* free up the reserved bast that we are cancelling.
		 * guaranteed that this will not be the last reserved
		 * ast because *both* an ast and a bast were reserved
		 * to get to this point.  the res->spinlock will not be
		 * taken here */
		dlm_lockres_release_ast(dlm, res);
	}
	list_add_tail(&lock->ast_list, &dlm->pending_asts);
	lock->ast_pending = 1;
	spin_unlock(&lock->spinlock);
}

void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
{
	BUG_ON(!dlm);
	BUG_ON(!lock);

	spin_lock(&dlm->ast_lock);
	__dlm_queue_ast(dlm, lock);
	spin_unlock(&dlm->ast_lock);
}


void __dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
{
	struct dlm_lock_resource *res;

	BUG_ON(!dlm);
	BUG_ON(!lock);

	assert_spin_locked(&dlm->ast_lock);

	res = lock->lockres;

	BUG_ON(!list_empty(&lock->bast_list));
	if (lock->bast_pending)
		mlog(0, "%s: res %.*s, lock %u:%llu, BAST getting flushed\n",
		     dlm->name, res->lockname.len, res->lockname.name,
		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));

	/* putting lock on list, add a ref */
	dlm_lock_get(lock);
	spin_lock(&lock->spinlock);
	list_add_tail(&lock->bast_list, &dlm->pending_basts);
	lock->bast_pending = 1;
	spin_unlock(&lock->spinlock);
}

void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
{
	BUG_ON(!dlm);
	BUG_ON(!lock);

	spin_lock(&dlm->ast_lock);
	__dlm_queue_bast(dlm, lock);
	spin_unlock(&dlm->ast_lock);
}

static void dlm_update_lvb(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
			   struct dlm_lock *lock)
{
	struct dlm_lockstatus *lksb = lock->lksb;
	BUG_ON(!lksb);

	/* only updates if this node masters the lockres */
	spin_lock(&res->spinlock);
	if (res->owner == dlm->node_num) {
		/* check the lksb flags for the direction */
		if (lksb->flags & DLM_LKSB_GET_LVB) {
			mlog(0, "getting lvb from lockres for %s node\n",
				  lock->ml.node == dlm->node_num ? "master" :
				  "remote");
			memcpy(lksb->lvb, res->lvb, DLM_LVB_LEN);
		}
		/* Do nothing for lvb put requests - they should be done in
 		 * place when the lock is downconverted - otherwise we risk
 		 * racing gets and puts which could result in old lvb data
 		 * being propagated. We leave the put flag set and clear it
 		 * here. In the future we might want to clear it at the time
 		 * the put is actually done.
		 */
	}
	spin_unlock(&res->spinlock);

	/* reset any lvb flags on the lksb */
	lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB);
}

void dlm_do_local_ast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
		      struct dlm_lock *lock)
{
	dlm_astlockfunc_t *fn;

	mlog(0, "%s: res %.*s, lock %u:%llu, Local AST\n", dlm->name,
	     res->lockname.len, res->lockname.name,
	     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));

	fn = lock->ast;
	BUG_ON(lock->ml.node != dlm->node_num);

	dlm_update_lvb(dlm, res, lock);
	(*fn)(lock->astdata);
}


int dlm_do_remote_ast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
		      struct dlm_lock *lock)
{
	int ret;
	struct dlm_lockstatus *lksb;
	int lksbflags;

	mlog(0, "%s: res %.*s, lock %u:%llu, Remote AST\n", dlm->name,
	     res->lockname.len, res->lockname.name,
	     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));

	lksb = lock->lksb;
	BUG_ON(lock->ml.node == dlm->node_num);

	lksbflags = lksb->flags;
	dlm_update_lvb(dlm, res, lock);

	/* lock request came from another node
	 * go do the ast over there */
	ret = dlm_send_proxy_ast(dlm, res, lock, lksbflags);
	return ret;
}

void dlm_do_local_bast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
		       struct dlm_lock *lock, int blocked_type)
{
	dlm_bastlockfunc_t *fn = lock->bast;

	BUG_ON(lock->ml.node != dlm->node_num);

	mlog(0, "%s: res %.*s, lock %u:%llu, Local BAST, blocked %d\n",
	     dlm->name, res->lockname.len, res->lockname.name,
	     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
	     blocked_type);

	(*fn)(lock->astdata, blocked_type);
}


int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
			  void **ret_data)
{
	int ret;
	unsigned int locklen;
	struct dlm_ctxt *dlm = data;
	struct dlm_lock_resource *res = NULL;
	struct dlm_lock *lock = NULL;
	struct dlm_proxy_ast *past = (struct dlm_proxy_ast *) msg->buf;
	char *name;
	struct list_head *head = NULL;
	__be64 cookie;
	u32 flags;
	u8 node;

	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);

	name = past->name;
	locklen = past->namelen;
	cookie = past->cookie;
	flags = be32_to_cpu(past->flags);
	node = past->node_idx;

	if (locklen > DLM_LOCKID_NAME_MAX) {
		ret = DLM_IVBUFLEN;
		mlog(ML_ERROR, "Invalid name length (%d) in proxy ast "
		     "handler!\n", locklen);
		goto leave;
	}

	if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
	     (LKM_PUT_LVB|LKM_GET_LVB)) {
		mlog(ML_ERROR, "Both PUT and GET lvb specified, (0x%x)\n",
		     flags);
		ret = DLM_BADARGS;
		goto leave;
	}

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

	mlog(0, "type=%d, blocked_type=%d\n", past->type, past->blocked_type);

	if (past->type != DLM_AST &&
	    past->type != DLM_BAST) {
		mlog(ML_ERROR, "Unknown ast type! %d, cookie=%u:%llu"
		     "name=%.*s, node=%u\n", past->type,
		     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
		     locklen, name, node);
		ret = DLM_IVLOCKID;
		goto leave;
	}

	res = dlm_lookup_lockres(dlm, name, locklen);
	if (!res) {
		mlog(0, "Got %sast for unknown lockres! cookie=%u:%llu, "
		     "name=%.*s, node=%u\n", (past->type == DLM_AST ? "" : "b"),
		     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
		     locklen, name, node);
		ret = DLM_IVLOCKID;
		goto leave;
	}

	/* cannot get a proxy ast message if this node owns it */
	BUG_ON(res->owner == dlm->node_num);

	mlog(0, "%s: res %.*s\n", dlm->name, res->lockname.len,
	     res->lockname.name);

	spin_lock(&res->spinlock);
	if (res->state & DLM_LOCK_RES_RECOVERING) {
		mlog(0, "Responding with DLM_RECOVERING!\n");
		ret = DLM_RECOVERING;
		goto unlock_out;
	}
	if (res->state & DLM_LOCK_RES_MIGRATING) {
		mlog(0, "Responding with DLM_MIGRATING!\n");
		ret = DLM_MIGRATING;
		goto unlock_out;
	}
	/* try convert queue for both ast/bast */
	head = &res->converting;
	lock = NULL;
	list_for_each_entry(lock, head, list) {
		if (lock->ml.cookie == cookie)
			goto do_ast;
	}

	/* if not on convert, try blocked for ast, granted for bast */
	if (past->type == DLM_AST)
		head = &res->blocked;
	else
		head = &res->granted;

	list_for_each_entry(lock, head, list) {
		/* if lock is found but unlock is pending ignore the bast */
		if (lock->ml.cookie == cookie) {
			if (lock->unlock_pending)
				break;
			goto do_ast;
		}
	}

	mlog(0, "Got %sast for unknown lock! cookie=%u:%llu, name=%.*s, "
	     "node=%u\n", past->type == DLM_AST ? "" : "b",
	     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
	     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
	     locklen, name, node);

	ret = DLM_NORMAL;
unlock_out:
	spin_unlock(&res->spinlock);
	goto leave;

do_ast:
	ret = DLM_NORMAL;
	if (past->type == DLM_AST) {
		/* do not alter lock refcount.  switching lists. */
		list_move_tail(&lock->list, &res->granted);
		mlog(0, "%s: res %.*s, lock %u:%llu, Granted type %d => %d\n",
		     dlm->name, res->lockname.len, res->lockname.name,
		     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
		     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
		     lock->ml.type, lock->ml.convert_type);

		if (lock->ml.convert_type != LKM_IVMODE) {
			lock->ml.type = lock->ml.convert_type;
			lock->ml.convert_type = LKM_IVMODE;
		} else {
			// should already be there....
		}

		lock->lksb->status = DLM_NORMAL;

		/* if we requested the lvb, fetch it into our lksb now */
		if (flags & LKM_GET_LVB) {
			BUG_ON(!(lock->lksb->flags & DLM_LKSB_GET_LVB));
			memcpy(lock->lksb->lvb, past->lvb, DLM_LVB_LEN);
		}
	}
	spin_unlock(&res->spinlock);

	if (past->type == DLM_AST)
		dlm_do_local_ast(dlm, res, lock);
	else
		dlm_do_local_bast(dlm, res, lock, past->blocked_type);

leave:
	if (res)
		dlm_lockres_put(res);

	dlm_put(dlm);
	return ret;
}


int dlm_send_proxy_ast_msg(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
			   struct dlm_lock *lock, int msg_type,
			   int blocked_type, int flags)
{
	int ret = 0;
	struct dlm_proxy_ast past;
	struct kvec vec[2];
	size_t veclen = 1;
	int status;

	mlog(0, "%s: res %.*s, to %u, type %d, blocked_type %d\n", dlm->name,
	     res->lockname.len, res->lockname.name, lock->ml.node, msg_type,
	     blocked_type);

	memset(&past, 0, sizeof(struct dlm_proxy_ast));
	past.node_idx = dlm->node_num;
	past.type = msg_type;
	past.blocked_type = blocked_type;
	past.namelen = res->lockname.len;
	memcpy(past.name, res->lockname.name, past.namelen);
	past.cookie = lock->ml.cookie;

	vec[0].iov_len = sizeof(struct dlm_proxy_ast);
	vec[0].iov_base = &past;
	if (flags & DLM_LKSB_GET_LVB) {
		be32_add_cpu(&past.flags, LKM_GET_LVB);
		vec[1].iov_len = DLM_LVB_LEN;
		vec[1].iov_base = lock->lksb->lvb;
		veclen++;
	}

	ret = o2net_send_message_vec(DLM_PROXY_AST_MSG, dlm->key, vec, veclen,
				     lock->ml.node, &status);
	if (ret < 0)
		mlog(ML_ERROR, "%s: res %.*s, error %d send AST to node %u\n",
		     dlm->name, res->lockname.len, res->lockname.name, ret,
		     lock->ml.node);
	else {
		if (status == DLM_RECOVERING) {
			mlog(ML_ERROR, "sent AST to node %u, it thinks this "
			     "node is dead!\n", lock->ml.node);
			BUG();
		} else if (status == DLM_MIGRATING) {
			mlog(ML_ERROR, "sent AST to node %u, it returned "
			     "DLM_MIGRATING!\n", lock->ml.node);
			BUG();
		} else if (status != DLM_NORMAL && status != DLM_IVLOCKID) {
			mlog(ML_ERROR, "AST to node %u returned %d!\n",
			     lock->ml.node, status);
			/* ignore it */
		}
		ret = 0;
	}
	return ret;
}
Commit	Line	Data
328970de	1	// SPDX-License-Identifier: GPL-2.0-or-later
6714d8e8 KH	2	/* -- mode: c; c-basic-offset: 8; --
	3	* vim: noexpandtab sw=8 ts=8 sts=0:
	4	*
	5	* dlmast.c
	6	*
	7	* AST and BAST functionality for local and remote nodes
	8	*
	9	* Copyright (C) 2004 Oracle. All rights reserved.
6714d8e8 KH	10	*/
	11
	12
	13	#include <linux/module.h>
	14	#include <linux/fs.h>
	15	#include <linux/types.h>
6714d8e8	16	#include <linux/highmem.h>
6714d8e8 KH	17	#include <linux/init.h>
	18	#include <linux/sysctl.h>
	19	#include <linux/random.h>
	20	#include <linux/blkdev.h>
	21	#include <linux/socket.h>
	22	#include <linux/inet.h>
	23	#include <linux/spinlock.h>
	24
	25
	26	#include "cluster/heartbeat.h"
	27	#include "cluster/nodemanager.h"
	28	#include "cluster/tcp.h"
6714d8e8 KH	29
	30	#include "dlmapi.h"
	31	#include "dlmcommon.h"
	32
	33	#define MLOG_MASK_PREFIX ML_DLM
	34	#include "cluster/masklog.h"
	35
	36	static void dlm_update_lvb(struct dlm_ctxt dlm, struct dlm_lock_resource res,
	37	struct dlm_lock *lock);
	38	static int dlm_should_cancel_bast(struct dlm_ctxt dlm, struct dlm_lock lock);
	39
	40	/* Should be called as an ast gets queued to see if the new
	41	* lock level will obsolete a pending bast.
	42	* For example, if dlm_thread queued a bast for an EX lock that
	43	* was blocking another EX, but before sending the bast the
	44	* lock owner downconverted to NL, the bast is now obsolete.
	45	* Only the ast should be sent.
	46	* This is needed because the lock and convert paths can queue
	47	* asts out-of-band (not waiting for dlm_thread) in order to
	48	* allow for LKM_NOQUEUE to get immediate responses. */
	49	static int dlm_should_cancel_bast(struct dlm_ctxt dlm, struct dlm_lock lock)
	50	{
	51	assert_spin_locked(&dlm->ast_lock);
	52	assert_spin_locked(&lock->spinlock);
	53
	54	if (lock->ml.highest_blocked == LKM_IVMODE)
	55	return 0;
	56	BUG_ON(lock->ml.highest_blocked == LKM_NLMODE);
	57
	58	if (lock->bast_pending &&
	59	list_empty(&lock->bast_list))
	60	/* old bast already sent, ok */
	61	return 0;
	62
	63	if (lock->ml.type == LKM_EXMODE)
	64	/* EX blocks anything left, any bast still valid */
	65	return 0;
	66	else if (lock->ml.type == LKM_NLMODE)
	67	/* NL blocks nothing, no reason to send any bast, cancel it */
	68	return 1;
	69	else if (lock->ml.highest_blocked != LKM_EXMODE)
	70	/* PR only blocks EX */
	71	return 1;
	72
	73	return 0;
	74	}
	75
d9ef7522	76	void __dlm_queue_ast(struct dlm_ctxt dlm, struct dlm_lock lock)
6714d8e8	77	{
8e17d16f	78	struct dlm_lock_resource *res;
6714d8e8 KH	79
	80	BUG_ON(!dlm);
	81	BUG_ON(!lock);
	82
8e17d16f SM	83	res = lock->lockres;
8e17d16f SM	84
6714d8e8	85	assert_spin_locked(&dlm->ast_lock);
8e17d16f	86
6714d8e8	87	if (!list_empty(&lock->ast_list)) {
8e17d16f SM	88	mlog(ML_ERROR, "%s: res %.*s, lock %u:%llu, "
	89	"AST list not empty, pending %d, newlevel %d\n",
	90	dlm->name, res->lockname.len, res->lockname.name,
	91	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	92	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
6714d8e8 KH	93	lock->ast_pending, lock->ml.type);
	94	BUG();
	95	}
6714d8e8	96	if (lock->ast_pending)
8e17d16f SM	97	mlog(0, "%s: res %.*s, lock %u:%llu, AST getting flushed\n",
	98	dlm->name, res->lockname.len, res->lockname.name,
	99	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	100	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));
6714d8e8 KH	101
	102	/* putting lock on list, add a ref */
	103	dlm_lock_get(lock);
	104	spin_lock(&lock->spinlock);
	105
	106	/* check to see if this ast obsoletes the bast */
	107	if (dlm_should_cancel_bast(dlm, lock)) {
8e17d16f SM	108	mlog(0, "%s: res %.*s, lock %u:%llu, Cancelling BAST\n",
	109	dlm->name, res->lockname.len, res->lockname.name,
	110	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	111	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));
6714d8e8 KH	112	lock->bast_pending = 0;
	113	list_del_init(&lock->bast_list);
	114	lock->ml.highest_blocked = LKM_IVMODE;
	115	/* removing lock from list, remove a ref. guaranteed
	116	* this won't be the last ref because of the get above,
	117	* so res->spinlock will not be taken here */
	118	dlm_lock_put(lock);
	119	/* free up the reserved bast that we are cancelling.
	120	* guaranteed that this will not be the last reserved
2bd63216	121	* ast because both an ast and a bast were reserved
6714d8e8 KH	122	* to get to this point. the res->spinlock will not be
	123	* taken here */
	124	dlm_lockres_release_ast(dlm, res);
	125	}
	126	list_add_tail(&lock->ast_list, &dlm->pending_asts);
	127	lock->ast_pending = 1;
	128	spin_unlock(&lock->spinlock);
	129	}
	130
	131	void dlm_queue_ast(struct dlm_ctxt dlm, struct dlm_lock lock)
	132	{
6714d8e8 KH	133	BUG_ON(!dlm);
	134	BUG_ON(!lock);
	135
	136	spin_lock(&dlm->ast_lock);
	137	__dlm_queue_ast(dlm, lock);
	138	spin_unlock(&dlm->ast_lock);
	139	}
	140
	141
d9ef7522	142	void __dlm_queue_bast(struct dlm_ctxt dlm, struct dlm_lock lock)
6714d8e8	143	{
8e17d16f	144	struct dlm_lock_resource *res;
6714d8e8 KH	145
	146	BUG_ON(!dlm);
	147	BUG_ON(!lock);
8e17d16f	148
6714d8e8 KH	149	assert_spin_locked(&dlm->ast_lock);
6714d8e8 KH	150
8e17d16f SM	151	res = lock->lockres;
8e17d16f SM	152
6714d8e8 KH	153	BUG_ON(!list_empty(&lock->bast_list));
6714d8e8 KH	154	if (lock->bast_pending)
8e17d16f SM	155	mlog(0, "%s: res %.*s, lock %u:%llu, BAST getting flushed\n",
	156	dlm->name, res->lockname.len, res->lockname.name,
	157	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	158	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));
6714d8e8 KH	159
	160	/* putting lock on list, add a ref */
	161	dlm_lock_get(lock);
	162	spin_lock(&lock->spinlock);
	163	list_add_tail(&lock->bast_list, &dlm->pending_basts);
	164	lock->bast_pending = 1;
	165	spin_unlock(&lock->spinlock);
	166	}
	167
	168	void dlm_queue_bast(struct dlm_ctxt dlm, struct dlm_lock lock)
	169	{
6714d8e8 KH	170	BUG_ON(!dlm);
	171	BUG_ON(!lock);
	172
	173	spin_lock(&dlm->ast_lock);
	174	__dlm_queue_bast(dlm, lock);
	175	spin_unlock(&dlm->ast_lock);
	176	}
	177
	178	static void dlm_update_lvb(struct dlm_ctxt dlm, struct dlm_lock_resource res,
	179	struct dlm_lock *lock)
	180	{
	181	struct dlm_lockstatus *lksb = lock->lksb;
	182	BUG_ON(!lksb);
	183
	184	/* only updates if this node masters the lockres */
428257f8	185	spin_lock(&res->spinlock);
6714d8e8	186	if (res->owner == dlm->node_num) {
6714d8e8 KH	187	/* check the lksb flags for the direction */
	188	if (lksb->flags & DLM_LKSB_GET_LVB) {
	189	mlog(0, "getting lvb from lockres for %s node\n",
	190	lock->ml.node == dlm->node_num ? "master" :
	191	"remote");
	192	memcpy(lksb->lvb, res->lvb, DLM_LVB_LEN);
6714d8e8	193	}
c0a8520c MF	194	/* Do nothing for lvb put requests - they should be done in
	195	* place when the lock is downconverted - otherwise we risk
	196	* racing gets and puts which could result in old lvb data
	197	* being propagated. We leave the put flag set and clear it
	198	* here. In the future we might want to clear it at the time
	199	* the put is actually done.
	200	*/
6714d8e8	201	}
428257f8	202	spin_unlock(&res->spinlock);
6714d8e8 KH	203
	204	/* reset any lvb flags on the lksb */
	205	lksb->flags &= ~(DLM_LKSB_PUT_LVB\|DLM_LKSB_GET_LVB);
	206	}
	207
	208	void dlm_do_local_ast(struct dlm_ctxt dlm, struct dlm_lock_resource res,
	209	struct dlm_lock *lock)
	210	{
	211	dlm_astlockfunc_t *fn;
6714d8e8	212
8e17d16f SM	213	mlog(0, "%s: res %.*s, lock %u:%llu, Local AST\n", dlm->name,
	214	res->lockname.len, res->lockname.name,
	215	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	216	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));
6714d8e8	217
6714d8e8 KH	218	fn = lock->ast;
	219	BUG_ON(lock->ml.node != dlm->node_num);
	220
	221	dlm_update_lvb(dlm, res, lock);
	222	(*fn)(lock->astdata);
	223	}
	224
	225
	226	int dlm_do_remote_ast(struct dlm_ctxt dlm, struct dlm_lock_resource res,
	227	struct dlm_lock *lock)
	228	{
	229	int ret;
	230	struct dlm_lockstatus *lksb;
	231	int lksbflags;
	232
8e17d16f SM	233	mlog(0, "%s: res %.*s, lock %u:%llu, Remote AST\n", dlm->name,
	234	res->lockname.len, res->lockname.name,
	235	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	236	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)));
6714d8e8 KH	237
	238	lksb = lock->lksb;
	239	BUG_ON(lock->ml.node == dlm->node_num);
	240
	241	lksbflags = lksb->flags;
	242	dlm_update_lvb(dlm, res, lock);
	243
	244	/* lock request came from another node
	245	* go do the ast over there */
	246	ret = dlm_send_proxy_ast(dlm, res, lock, lksbflags);
	247	return ret;
	248	}
	249
	250	void dlm_do_local_bast(struct dlm_ctxt dlm, struct dlm_lock_resource res,
	251	struct dlm_lock *lock, int blocked_type)
	252	{
	253	dlm_bastlockfunc_t *fn = lock->bast;
	254
6714d8e8 KH	255	BUG_ON(lock->ml.node != dlm->node_num);
6714d8e8 KH	256
8e17d16f SM	257	mlog(0, "%s: res %.*s, lock %u:%llu, Local BAST, blocked %d\n",
	258	dlm->name, res->lockname.len, res->lockname.name,
	259	dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	260	dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
	261	blocked_type);
	262
6714d8e8 KH	263	(*fn)(lock->astdata, blocked_type);
	264	}
	265
	266
	267
d74c9803 KH	268	int dlm_proxy_ast_handler(struct o2net_msg msg, u32 len, void data,
d74c9803 KH	269	void **ret_data)
6714d8e8 KH	270	{
	271	int ret;
	272	unsigned int locklen;
	273	struct dlm_ctxt *dlm = data;
	274	struct dlm_lock_resource *res = NULL;
	275	struct dlm_lock *lock = NULL;
	276	struct dlm_proxy_ast past = (struct dlm_proxy_ast ) msg->buf;
	277	char *name;
df53cd3b	278	struct list_head *head = NULL;
85158410	279	__be64 cookie;
6714d8e8	280	u32 flags;
57dff267	281	u8 node;
6714d8e8 KH	282
	283	if (!dlm_grab(dlm)) {
	284	dlm_error(DLM_REJECTED);
	285	return DLM_REJECTED;
	286	}
	287
	288	mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
	289	"Domain %s not fully joined!\n", dlm->name);
	290
	291	name = past->name;
	292	locklen = past->namelen;
57dff267	293	cookie = past->cookie;
6714d8e8	294	flags = be32_to_cpu(past->flags);
57dff267	295	node = past->node_idx;
6714d8e8 KH	296
	297	if (locklen > DLM_LOCKID_NAME_MAX) {
	298	ret = DLM_IVBUFLEN;
57dff267 SM	299	mlog(ML_ERROR, "Invalid name length (%d) in proxy ast "
57dff267 SM	300	"handler!\n", locklen);
6714d8e8 KH	301	goto leave;
	302	}
	303
	304	if ((flags & (LKM_PUT_LVB\|LKM_GET_LVB)) ==
	305	(LKM_PUT_LVB\|LKM_GET_LVB)) {
57dff267 SM	306	mlog(ML_ERROR, "Both PUT and GET lvb specified, (0x%x)\n",
57dff267 SM	307	flags);
6714d8e8 KH	308	ret = DLM_BADARGS;
	309	goto leave;
	310	}
	311
	312	mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
	313	(flags & LKM_GET_LVB ? "get lvb" : "none"));
	314
	315	mlog(0, "type=%d, blocked_type=%d\n", past->type, past->blocked_type);
	316
	317	if (past->type != DLM_AST &&
	318	past->type != DLM_BAST) {
29004858	319	mlog(ML_ERROR, "Unknown ast type! %d, cookie=%u:%llu"
57dff267 SM	320	"name=%.*s, node=%u\n", past->type,
	321	dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
	322	dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
	323	locklen, name, node);
6714d8e8 KH	324	ret = DLM_IVLOCKID;
	325	goto leave;
	326	}
	327
	328	res = dlm_lookup_lockres(dlm, name, locklen);
	329	if (!res) {
57dff267 SM	330	mlog(0, "Got %sast for unknown lockres! cookie=%u:%llu, "
	331	"name=%.*s, node=%u\n", (past->type == DLM_AST ? "" : "b"),
	332	dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
	333	dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
	334	locklen, name, node);
6714d8e8 KH	335	ret = DLM_IVLOCKID;
	336	goto leave;
	337	}
	338
	339	/* cannot get a proxy ast message if this node owns it */
	340	BUG_ON(res->owner == dlm->node_num);
	341
8e17d16f SM	342	mlog(0, "%s: res %.*s\n", dlm->name, res->lockname.len,
8e17d16f SM	343	res->lockname.name);
6714d8e8 KH	344
	345	spin_lock(&res->spinlock);
	346	if (res->state & DLM_LOCK_RES_RECOVERING) {
57dff267	347	mlog(0, "Responding with DLM_RECOVERING!\n");
6714d8e8 KH	348	ret = DLM_RECOVERING;
	349	goto unlock_out;
	350	}
	351	if (res->state & DLM_LOCK_RES_MIGRATING) {
57dff267	352	mlog(0, "Responding with DLM_MIGRATING!\n");
6714d8e8 KH	353	ret = DLM_MIGRATING;
	354	goto unlock_out;
	355	}
	356	/* try convert queue for both ast/bast */
	357	head = &res->converting;
	358	lock = NULL;
df53cd3b	359	list_for_each_entry(lock, head, list) {
57dff267	360	if (lock->ml.cookie == cookie)
6714d8e8 KH	361	goto do_ast;
	362	}
	363
	364	/* if not on convert, try blocked for ast, granted for bast */
	365	if (past->type == DLM_AST)
	366	head = &res->blocked;
	367	else
	368	head = &res->granted;
	369
df53cd3b	370	list_for_each_entry(lock, head, list) {
99b8874e SE	371	/* if lock is found but unlock is pending ignore the bast */
	372	if (lock->ml.cookie == cookie) {
	373	if (lock->unlock_pending)
	374	break;
6714d8e8	375	goto do_ast;
99b8874e	376	}
6714d8e8 KH	377	}
6714d8e8 KH	378
57dff267 SM	379	mlog(0, "Got %sast for unknown lock! cookie=%u:%llu, name=%.*s, "
	380	"node=%u\n", past->type == DLM_AST ? "" : "b",
	381	dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
	382	dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
	383	locklen, name, node);
6714d8e8 KH	384
	385	ret = DLM_NORMAL;
	386	unlock_out:
	387	spin_unlock(&res->spinlock);
	388	goto leave;
	389
	390	do_ast:
	391	ret = DLM_NORMAL;
	392	if (past->type == DLM_AST) {
	393	/* do not alter lock refcount. switching lists. */
f116629d	394	list_move_tail(&lock->list, &res->granted);
8e17d16f SM	395	mlog(0, "%s: res %.*s, lock %u:%llu, Granted type %d => %d\n",
	396	dlm->name, res->lockname.len, res->lockname.name,
	397	dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
	398	dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
	399	lock->ml.type, lock->ml.convert_type);
	400
6714d8e8 KH	401	if (lock->ml.convert_type != LKM_IVMODE) {
	402	lock->ml.type = lock->ml.convert_type;
	403	lock->ml.convert_type = LKM_IVMODE;
	404	} else {
	405	// should already be there....
	406	}
	407
	408	lock->lksb->status = DLM_NORMAL;
	409
	410	/* if we requested the lvb, fetch it into our lksb now */
	411	if (flags & LKM_GET_LVB) {
	412	BUG_ON(!(lock->lksb->flags & DLM_LKSB_GET_LVB));
	413	memcpy(lock->lksb->lvb, past->lvb, DLM_LVB_LEN);
	414	}
	415	}
	416	spin_unlock(&res->spinlock);
	417
	418	if (past->type == DLM_AST)
	419	dlm_do_local_ast(dlm, res, lock);
	420	else
	421	dlm_do_local_bast(dlm, res, lock, past->blocked_type);
	422
	423	leave:
6714d8e8 KH	424	if (res)
	425	dlm_lockres_put(res);
	426
	427	dlm_put(dlm);
	428	return ret;
	429	}
	430
	431
	432
	433	int dlm_send_proxy_ast_msg(struct dlm_ctxt dlm, struct dlm_lock_resource res,
	434	struct dlm_lock *lock, int msg_type,
	435	int blocked_type, int flags)
	436	{
	437	int ret = 0;
	438	struct dlm_proxy_ast past;
	439	struct kvec vec[2];
	440	size_t veclen = 1;
	441	int status;
	442
8e17d16f SM	443	mlog(0, "%s: res %.*s, to %u, type %d, blocked_type %d\n", dlm->name,
	444	res->lockname.len, res->lockname.name, lock->ml.node, msg_type,
	445	blocked_type);
6714d8e8 KH	446
	447	memset(&past, 0, sizeof(struct dlm_proxy_ast));
	448	past.node_idx = dlm->node_num;
	449	past.type = msg_type;
	450	past.blocked_type = blocked_type;
	451	past.namelen = res->lockname.len;
	452	memcpy(past.name, res->lockname.name, past.namelen);
	453	past.cookie = lock->ml.cookie;
	454
	455	vec[0].iov_len = sizeof(struct dlm_proxy_ast);
	456	vec[0].iov_base = &past;
	457	if (flags & DLM_LKSB_GET_LVB) {
6714d8e8 KH	458	be32_add_cpu(&past.flags, LKM_GET_LVB);
	459	vec[1].iov_len = DLM_LVB_LEN;
	460	vec[1].iov_base = lock->lksb->lvb;
	461	veclen++;
	462	}
	463
	464	ret = o2net_send_message_vec(DLM_PROXY_AST_MSG, dlm->key, vec, veclen,
	465	lock->ml.node, &status);
	466	if (ret < 0)
8e17d16f SM	467	mlog(ML_ERROR, "%s: res %.*s, error %d send AST to node %u\n",
8e17d16f SM	468	dlm->name, res->lockname.len, res->lockname.name, ret,
a5196ec5	469	lock->ml.node);
6714d8e8 KH	470	else {
	471	if (status == DLM_RECOVERING) {
	472	mlog(ML_ERROR, "sent AST to node %u, it thinks this "
	473	"node is dead!\n", lock->ml.node);
	474	BUG();
	475	} else if (status == DLM_MIGRATING) {
	476	mlog(ML_ERROR, "sent AST to node %u, it returned "
	477	"DLM_MIGRATING!\n", lock->ml.node);
	478	BUG();
e2c73698	479	} else if (status != DLM_NORMAL && status != DLM_IVLOCKID) {
6714d8e8 KH	480	mlog(ML_ERROR, "AST to node %u returned %d!\n",
	481	lock->ml.node, status);
	482	/* ignore it */
	483	}
	484	ret = 0;
	485	}
	486	return ret;
	487	}