From 6714d8e86bf443f6f7af50f9d432025649f091f5 Mon Sep 17 00:00:00 2001 From: Kurt Hackel Date: Thu, 15 Dec 2005 14:31:23 -0800 Subject: [PATCH] OCFS2: The Second Oracle Cluster Filesystem A distributed lock manager built with the cluster file system use case in mind. The OCFS2 dlm exposes a VMS style API, though things have been simplified internally. The only lock levels implemented currently are NLMODE, PRMODE and EXMODE. Signed-off-by: Mark Fasheh Signed-off-by: Kurt Hackel --- fs/ocfs2/dlm/dlmconvert.c | 530 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 530 insertions(+) create mode 100644 fs/ocfs2/dlm/dlmconvert.c (limited to 'fs/ocfs2/dlm/dlmconvert.c') diff --git a/fs/ocfs2/dlm/dlmconvert.c b/fs/ocfs2/dlm/dlmconvert.c new file mode 100644 index 00000000000000..6001b22a997d81 --- /dev/null +++ b/fs/ocfs2/dlm/dlmconvert.c @@ -0,0 +1,530 @@ +/* -*- 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#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; + 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_del_init(&lock->list); + list_add_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_del_init(&lock->list); + list_add_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=%"MLFu64", conv=%d)\n", + 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_del_init(&lock->list); + list_add_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)) { + 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) +{ + 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; + + 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); + 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; + dlm_error(status); + 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); + 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; + } + spin_unlock(&res->spinlock); + + if (status != DLM_NORMAL) { + if (status != DLM_NOTQUEUED) + dlm_error(status); + lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); + } + +leave: + if (!lock) + mlog(ML_ERROR, "did not find lock to convert on grant queue! " + "cookie=%"MLFu64"\n", + cnv->cookie); + else + dlm_lock_put(lock); + + /* 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); + + if (res) + dlm_lockres_put(res); + + dlm_put(dlm); + + return status; +} -- cgit 1.2.3-korg