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- /* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * dlmlock.c
- *
- * underlying calls for lock creation
- *
- * 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/slab.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 <linux/delay.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"
- static struct kmem_cache *dlm_lock_cache;
- static DEFINE_SPINLOCK(dlm_cookie_lock);
- static u64 dlm_next_cookie = 1;
- static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
- struct dlm_lock_resource *res,
- struct dlm_lock *lock, int flags);
- static void dlm_init_lock(struct dlm_lock *newlock, int type,
- u8 node, u64 cookie);
- static void dlm_lock_release(struct kref *kref);
- static void dlm_lock_detach_lockres(struct dlm_lock *lock);
- int dlm_init_lock_cache(void)
- {
- dlm_lock_cache = kmem_cache_create("o2dlm_lock",
- sizeof(struct dlm_lock),
- 0, SLAB_HWCACHE_ALIGN, NULL);
- if (dlm_lock_cache == NULL)
- return -ENOMEM;
- return 0;
- }
- void dlm_destroy_lock_cache(void)
- {
- if (dlm_lock_cache)
- kmem_cache_destroy(dlm_lock_cache);
- }
- /* Tell us whether we can grant a new lock request.
- * locking:
- * caller needs: res->spinlock
- * taken: none
- * held on exit: none
- * returns: 1 if the lock can be granted, 0 otherwise.
- */
- static int dlm_can_grant_new_lock(struct dlm_lock_resource *res,
- struct dlm_lock *lock)
- {
- struct dlm_lock *tmplock;
- list_for_each_entry(tmplock, &res->granted, list) {
- if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
- return 0;
- }
- list_for_each_entry(tmplock, &res->converting, list) {
- if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
- return 0;
- if (!dlm_lock_compatible(tmplock->ml.convert_type,
- lock->ml.type))
- return 0;
- }
- return 1;
- }
- /* performs lock creation at the lockres master site
- * locking:
- * caller needs: none
- * taken: takes and drops res->spinlock
- * held on exit: none
- * returns: DLM_NORMAL, DLM_NOTQUEUED
- */
- static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
- struct dlm_lock_resource *res,
- struct dlm_lock *lock, int flags)
- {
- int call_ast = 0, kick_thread = 0;
- enum dlm_status status = DLM_NORMAL;
- mlog(0, "type=%d\n", lock->ml.type);
- spin_lock(&res->spinlock);
- /* if called from dlm_create_lock_handler, need to
- * ensure it will not sleep in dlm_wait_on_lockres */
- status = __dlm_lockres_state_to_status(res);
- if (status != DLM_NORMAL &&
- lock->ml.node != dlm->node_num) {
- /* erf. state changed after lock was dropped. */
- spin_unlock(&res->spinlock);
- dlm_error(status);
- return status;
- }
- __dlm_wait_on_lockres(res);
- __dlm_lockres_reserve_ast(res);
- if (dlm_can_grant_new_lock(res, lock)) {
- mlog(0, "I can grant this lock right away\n");
- /* got it right away */
- lock->lksb->status = DLM_NORMAL;
- status = DLM_NORMAL;
- dlm_lock_get(lock);
- list_add_tail(&lock->list, &res->granted);
- /* for the recovery lock, we can't allow the ast
- * to be queued since the dlmthread is already
- * frozen. but the recovery lock is always locked
- * with LKM_NOQUEUE so we do not need the ast in
- * this special case */
- if (!dlm_is_recovery_lock(res->lockname.name,
- res->lockname.len)) {
- kick_thread = 1;
- call_ast = 1;
- } else {
- mlog(0, "%s: returning DLM_NORMAL to "
- "node %u for reco lock\n", dlm->name,
- lock->ml.node);
- }
- } else {
- /* for NOQUEUE request, unless we get the
- * lock right away, return DLM_NOTQUEUED */
- if (flags & LKM_NOQUEUE) {
- status = DLM_NOTQUEUED;
- if (dlm_is_recovery_lock(res->lockname.name,
- res->lockname.len)) {
- mlog(0, "%s: returning NOTQUEUED to "
- "node %u for reco lock\n", dlm->name,
- lock->ml.node);
- }
- } else {
- status = DLM_NORMAL;
- dlm_lock_get(lock);
- list_add_tail(&lock->list, &res->blocked);
- kick_thread = 1;
- }
- }
- spin_unlock(&res->spinlock);
- wake_up(&res->wq);
- /* either queue the ast or release it */
- if (call_ast)
- dlm_queue_ast(dlm, lock);
- else
- dlm_lockres_release_ast(dlm, res);
- dlm_lockres_calc_usage(dlm, res);
- if (kick_thread)
- dlm_kick_thread(dlm, res);
- return status;
- }
- void dlm_revert_pending_lock(struct dlm_lock_resource *res,
- struct dlm_lock *lock)
- {
- /* remove from local queue if it failed */
- list_del_init(&lock->list);
- lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
- }
- /*
- * locking:
- * caller needs: none
- * taken: takes and drops res->spinlock
- * held on exit: none
- * returns: DLM_DENIED, DLM_RECOVERING, or net status
- */
- static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm,
- struct dlm_lock_resource *res,
- struct dlm_lock *lock, int flags)
- {
- enum dlm_status status = DLM_DENIED;
- int lockres_changed = 1;
- mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n",
- lock->ml.type, res->lockname.len,
- res->lockname.name, flags);
- /*
- * Wait if resource is getting recovered, remastered, etc.
- * If the resource was remastered and new owner is self, then exit.
- */
- spin_lock(&res->spinlock);
- __dlm_wait_on_lockres(res);
- if (res->owner == dlm->node_num) {
- spin_unlock(&res->spinlock);
- return DLM_RECOVERING;
- }
- res->state |= DLM_LOCK_RES_IN_PROGRESS;
- /* add lock to local (secondary) queue */
- dlm_lock_get(lock);
- list_add_tail(&lock->list, &res->blocked);
- lock->lock_pending = 1;
- spin_unlock(&res->spinlock);
- /* spec seems to say that you will get DLM_NORMAL when the lock
- * has been queued, meaning we need to wait for a reply here. */
- status = dlm_send_remote_lock_request(dlm, res, lock, flags);
- spin_lock(&res->spinlock);
- res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
- lock->lock_pending = 0;
- if (status != DLM_NORMAL) {
- if (status == DLM_RECOVERING &&
- dlm_is_recovery_lock(res->lockname.name,
- res->lockname.len)) {
- /* recovery lock was mastered by dead node.
- * we need to have calc_usage shoot down this
- * lockres and completely remaster it. */
- mlog(0, "%s: recovery lock was owned by "
- "dead node %u, remaster it now.\n",
- dlm->name, res->owner);
- } else if (status != DLM_NOTQUEUED) {
- /*
- * DO NOT call calc_usage, as this would unhash
- * the remote lockres before we ever get to use
- * it. treat as if we never made any change to
- * the lockres.
- */
- lockres_changed = 0;
- dlm_error(status);
- }
- dlm_revert_pending_lock(res, lock);
- dlm_lock_put(lock);
- } else if (dlm_is_recovery_lock(res->lockname.name,
- res->lockname.len)) {
- /* special case for the $RECOVERY lock.
- * there will never be an AST delivered to put
- * this lock on the proper secondary queue
- * (granted), so do it manually. */
- mlog(0, "%s: $RECOVERY lock for this node (%u) is "
- "mastered by %u; got lock, manually granting (no ast)\n",
- dlm->name, dlm->node_num, res->owner);
- list_move_tail(&lock->list, &res->granted);
- }
- spin_unlock(&res->spinlock);
- if (lockres_changed)
- dlm_lockres_calc_usage(dlm, res);
- wake_up(&res->wq);
- return status;
- }
- /* for remote lock creation.
- * locking:
- * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS
- * taken: none
- * held on exit: none
- * returns: DLM_NOLOCKMGR, or net status
- */
- static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
- struct dlm_lock_resource *res,
- struct dlm_lock *lock, int flags)
- {
- struct dlm_create_lock create;
- int tmpret, status = 0;
- enum dlm_status ret;
- memset(&create, 0, sizeof(create));
- create.node_idx = dlm->node_num;
- create.requested_type = lock->ml.type;
- create.cookie = lock->ml.cookie;
- create.namelen = res->lockname.len;
- create.flags = cpu_to_be32(flags);
- memcpy(create.name, res->lockname.name, create.namelen);
- tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create,
- sizeof(create), res->owner, &status);
- if (tmpret >= 0) {
- ret = status;
- if (ret == DLM_REJECTED) {
- mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer "
- "owned by node %u. That node is coming back up "
- "currently.\n", dlm->name, create.namelen,
- create.name, res->owner);
- dlm_print_one_lock_resource(res);
- BUG();
- }
- } else {
- mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to "
- "node %u\n", dlm->name, create.namelen, create.name,
- tmpret, res->owner);
- if (dlm_is_host_down(tmpret))
- ret = DLM_RECOVERING;
- else
- ret = dlm_err_to_dlm_status(tmpret);
- }
- return ret;
- }
- void dlm_lock_get(struct dlm_lock *lock)
- {
- kref_get(&lock->lock_refs);
- }
- void dlm_lock_put(struct dlm_lock *lock)
- {
- kref_put(&lock->lock_refs, dlm_lock_release);
- }
- static void dlm_lock_release(struct kref *kref)
- {
- struct dlm_lock *lock;
- lock = container_of(kref, struct dlm_lock, lock_refs);
- BUG_ON(!list_empty(&lock->list));
- BUG_ON(!list_empty(&lock->ast_list));
- BUG_ON(!list_empty(&lock->bast_list));
- BUG_ON(lock->ast_pending);
- BUG_ON(lock->bast_pending);
- dlm_lock_detach_lockres(lock);
- if (lock->lksb_kernel_allocated) {
- mlog(0, "freeing kernel-allocated lksb\n");
- kfree(lock->lksb);
- }
- kmem_cache_free(dlm_lock_cache, lock);
- }
- /* associate a lock with it's lockres, getting a ref on the lockres */
- void dlm_lock_attach_lockres(struct dlm_lock *lock,
- struct dlm_lock_resource *res)
- {
- dlm_lockres_get(res);
- lock->lockres = res;
- }
- /* drop ref on lockres, if there is still one associated with lock */
- static void dlm_lock_detach_lockres(struct dlm_lock *lock)
- {
- struct dlm_lock_resource *res;
- res = lock->lockres;
- if (res) {
- lock->lockres = NULL;
- mlog(0, "removing lock's lockres reference\n");
- dlm_lockres_put(res);
- }
- }
- static void dlm_init_lock(struct dlm_lock *newlock, int type,
- u8 node, u64 cookie)
- {
- INIT_LIST_HEAD(&newlock->list);
- INIT_LIST_HEAD(&newlock->ast_list);
- INIT_LIST_HEAD(&newlock->bast_list);
- spin_lock_init(&newlock->spinlock);
- newlock->ml.type = type;
- newlock->ml.convert_type = LKM_IVMODE;
- newlock->ml.highest_blocked = LKM_IVMODE;
- newlock->ml.node = node;
- newlock->ml.pad1 = 0;
- newlock->ml.list = 0;
- newlock->ml.flags = 0;
- newlock->ast = NULL;
- newlock->bast = NULL;
- newlock->astdata = NULL;
- newlock->ml.cookie = cpu_to_be64(cookie);
- newlock->ast_pending = 0;
- newlock->bast_pending = 0;
- newlock->convert_pending = 0;
- newlock->lock_pending = 0;
- newlock->unlock_pending = 0;
- newlock->cancel_pending = 0;
- newlock->lksb_kernel_allocated = 0;
- kref_init(&newlock->lock_refs);
- }
- struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
- struct dlm_lockstatus *lksb)
- {
- struct dlm_lock *lock;
- int kernel_allocated = 0;
- lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS);
- if (!lock)
- return NULL;
- if (!lksb) {
- /* zero memory only if kernel-allocated */
- lksb = kzalloc(sizeof(*lksb), GFP_NOFS);
- if (!lksb) {
- kmem_cache_free(dlm_lock_cache, lock);
- return NULL;
- }
- kernel_allocated = 1;
- }
- dlm_init_lock(lock, type, node, cookie);
- if (kernel_allocated)
- lock->lksb_kernel_allocated = 1;
- lock->lksb = lksb;
- lksb->lockid = lock;
- return lock;
- }
- /* handler for lock creation net message
- * locking:
- * caller needs: none
- * taken: takes and drops res->spinlock
- * held on exit: none
- * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED
- */
- int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
- void **ret_data)
- {
- struct dlm_ctxt *dlm = data;
- struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf;
- struct dlm_lock_resource *res = NULL;
- struct dlm_lock *newlock = NULL;
- struct dlm_lockstatus *lksb = NULL;
- enum dlm_status status = DLM_NORMAL;
- char *name;
- unsigned int namelen;
- BUG_ON(!dlm);
- if (!dlm_grab(dlm))
- return DLM_REJECTED;
- name = create->name;
- namelen = create->namelen;
- status = DLM_REJECTED;
- if (!dlm_domain_fully_joined(dlm)) {
- mlog(ML_ERROR, "Domain %s not fully joined, but node %u is "
- "sending a create_lock message for lock %.*s!\n",
- dlm->name, create->node_idx, namelen, name);
- dlm_error(status);
- goto leave;
- }
- status = DLM_IVBUFLEN;
- if (namelen > DLM_LOCKID_NAME_MAX) {
- dlm_error(status);
- goto leave;
- }
- status = DLM_SYSERR;
- newlock = dlm_new_lock(create->requested_type,
- create->node_idx,
- be64_to_cpu(create->cookie), NULL);
- if (!newlock) {
- dlm_error(status);
- goto leave;
- }
- lksb = newlock->lksb;
- if (be32_to_cpu(create->flags) & LKM_GET_LVB) {
- lksb->flags |= DLM_LKSB_GET_LVB;
- mlog(0, "set DLM_LKSB_GET_LVB flag\n");
- }
- status = DLM_IVLOCKID;
- res = dlm_lookup_lockres(dlm, name, namelen);
- if (!res) {
- dlm_error(status);
- goto leave;
- }
- spin_lock(&res->spinlock);
- status = __dlm_lockres_state_to_status(res);
- spin_unlock(&res->spinlock);
- if (status != DLM_NORMAL) {
- mlog(0, "lockres recovering/migrating/in-progress\n");
- goto leave;
- }
- dlm_lock_attach_lockres(newlock, res);
- status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags));
- leave:
- if (status != DLM_NORMAL)
- if (newlock)
- dlm_lock_put(newlock);
- if (res)
- dlm_lockres_put(res);
- dlm_put(dlm);
- return status;
- }
- /* fetch next node-local (u8 nodenum + u56 cookie) into u64 */
- static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie)
- {
- u64 tmpnode = node_num;
- /* shift single byte of node num into top 8 bits */
- tmpnode <<= 56;
- spin_lock(&dlm_cookie_lock);
- *cookie = (dlm_next_cookie | tmpnode);
- if (++dlm_next_cookie & 0xff00000000000000ull) {
- mlog(0, "This node's cookie will now wrap!\n");
- dlm_next_cookie = 1;
- }
- spin_unlock(&dlm_cookie_lock);
- }
- enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
- struct dlm_lockstatus *lksb, int flags,
- const char *name, int namelen, dlm_astlockfunc_t *ast,
- void *data, dlm_bastlockfunc_t *bast)
- {
- enum dlm_status status;
- struct dlm_lock_resource *res = NULL;
- struct dlm_lock *lock = NULL;
- int convert = 0, recovery = 0;
- /* yes this function is a mess.
- * TODO: clean this up. lots of common code in the
- * lock and convert paths, especially in the retry blocks */
- if (!lksb) {
- dlm_error(DLM_BADARGS);
- return DLM_BADARGS;
- }
- status = DLM_BADPARAM;
- if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) {
- dlm_error(status);
- goto error;
- }
- if (flags & ~LKM_VALID_FLAGS) {
- dlm_error(status);
- goto error;
- }
- convert = (flags & LKM_CONVERT);
- recovery = (flags & LKM_RECOVERY);
- if (recovery &&
- (!dlm_is_recovery_lock(name, namelen) || convert) ) {
- dlm_error(status);
- goto error;
- }
- if (convert && (flags & LKM_LOCAL)) {
- mlog(ML_ERROR, "strange LOCAL convert request!\n");
- goto error;
- }
- if (convert) {
- /* CONVERT request */
- /* if converting, must pass in a valid dlm_lock */
- lock = lksb->lockid;
- if (!lock) {
- mlog(ML_ERROR, "NULL lock pointer in convert "
- "request\n");
- goto error;
- }
- res = lock->lockres;
- if (!res) {
- mlog(ML_ERROR, "NULL lockres pointer in convert "
- "request\n");
- goto error;
- }
- dlm_lockres_get(res);
- /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are
- * static after the original lock call. convert requests will
- * ensure that everything is the same, or return DLM_BADARGS.
- * this means that DLM_DENIED_NOASTS will never be returned.
- */
- if (lock->lksb != lksb || lock->ast != ast ||
- lock->bast != bast || lock->astdata != data) {
- status = DLM_BADARGS;
- mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, "
- "astdata=%p\n", lksb, ast, bast, data);
- mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, "
- "astdata=%p\n", lock->lksb, lock->ast,
- lock->bast, lock->astdata);
- goto error;
- }
- retry_convert:
- dlm_wait_for_recovery(dlm);
- if (res->owner == dlm->node_num)
- status = dlmconvert_master(dlm, res, lock, flags, mode);
- else
- status = dlmconvert_remote(dlm, res, lock, flags, mode);
- if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
- status == DLM_FORWARD) {
- /* for now, see how this works without sleeping
- * and just retry right away. I suspect the reco
- * or migration will complete fast enough that
- * no waiting will be necessary */
- mlog(0, "retrying convert with migration/recovery/"
- "in-progress\n");
- msleep(100);
- goto retry_convert;
- }
- } else {
- u64 tmpcookie;
- /* LOCK request */
- status = DLM_BADARGS;
- if (!name) {
- dlm_error(status);
- goto error;
- }
- status = DLM_IVBUFLEN;
- if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) {
- dlm_error(status);
- goto error;
- }
- dlm_get_next_cookie(dlm->node_num, &tmpcookie);
- lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb);
- if (!lock) {
- dlm_error(status);
- goto error;
- }
- if (!recovery)
- dlm_wait_for_recovery(dlm);
- /* find or create the lock resource */
- res = dlm_get_lock_resource(dlm, name, namelen, flags);
- if (!res) {
- status = DLM_IVLOCKID;
- dlm_error(status);
- goto error;
- }
- mlog(0, "type=%d, flags = 0x%x\n", mode, flags);
- mlog(0, "creating lock: lock=%p res=%p\n", lock, res);
- dlm_lock_attach_lockres(lock, res);
- lock->ast = ast;
- lock->bast = bast;
- lock->astdata = data;
- retry_lock:
- if (flags & LKM_VALBLK) {
- mlog(0, "LKM_VALBLK passed by caller\n");
- /* LVB requests for non PR, PW or EX locks are
- * ignored. */
- if (mode < LKM_PRMODE)
- flags &= ~LKM_VALBLK;
- else {
- flags |= LKM_GET_LVB;
- lock->lksb->flags |= DLM_LKSB_GET_LVB;
- }
- }
- if (res->owner == dlm->node_num)
- status = dlmlock_master(dlm, res, lock, flags);
- else
- status = dlmlock_remote(dlm, res, lock, flags);
- if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
- status == DLM_FORWARD) {
- msleep(100);
- if (recovery) {
- if (status != DLM_RECOVERING)
- goto retry_lock;
- /* wait to see the node go down, then
- * drop down and allow the lockres to
- * get cleaned up. need to remaster. */
- dlm_wait_for_node_death(dlm, res->owner,
- DLM_NODE_DEATH_WAIT_MAX);
- } else {
- dlm_wait_for_recovery(dlm);
- goto retry_lock;
- }
- }
- /* Inflight taken in dlm_get_lock_resource() is dropped here */
- spin_lock(&res->spinlock);
- dlm_lockres_drop_inflight_ref(dlm, res);
- spin_unlock(&res->spinlock);
- dlm_lockres_calc_usage(dlm, res);
- dlm_kick_thread(dlm, res);
- if (status != DLM_NORMAL) {
- lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
- if (status != DLM_NOTQUEUED)
- dlm_error(status);
- goto error;
- }
- }
- error:
- if (status != DLM_NORMAL) {
- if (lock && !convert)
- dlm_lock_put(lock);
- // this is kind of unnecessary
- lksb->status = status;
- }
- /* put lockres ref from the convert path
- * or from dlm_get_lock_resource */
- if (res)
- dlm_lockres_put(res);
- return status;
- }
- EXPORT_SYMBOL_GPL(dlmlock);
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