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658 lines
16 KiB
658 lines
16 KiB
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* userdlm.c
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*
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* Code which implements the kernel side of a minimal userspace
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* interface to our DLM.
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*
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* Many of the functions here are pared down versions of dlmglue.c
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* functions.
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*
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* Copyright (C) 2003, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/signal.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/crc32.h>
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#include "cluster/nodemanager.h"
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#include "cluster/heartbeat.h"
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#include "cluster/tcp.h"
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#include "dlmapi.h"
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#include "userdlm.h"
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#define MLOG_MASK_PREFIX ML_DLMFS
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#include "cluster/masklog.h"
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static inline int user_check_wait_flag(struct user_lock_res *lockres,
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int flag)
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{
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int ret;
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spin_lock(&lockres->l_lock);
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ret = lockres->l_flags & flag;
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spin_unlock(&lockres->l_lock);
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return ret;
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}
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static inline void user_wait_on_busy_lock(struct user_lock_res *lockres)
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{
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wait_event(lockres->l_event,
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!user_check_wait_flag(lockres, USER_LOCK_BUSY));
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}
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static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres)
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{
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wait_event(lockres->l_event,
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!user_check_wait_flag(lockres, USER_LOCK_BLOCKED));
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}
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/* I heart container_of... */
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static inline struct dlm_ctxt *
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dlm_ctxt_from_user_lockres(struct user_lock_res *lockres)
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{
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struct dlmfs_inode_private *ip;
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ip = container_of(lockres,
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struct dlmfs_inode_private,
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ip_lockres);
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return ip->ip_dlm;
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}
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static struct inode *
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user_dlm_inode_from_user_lockres(struct user_lock_res *lockres)
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{
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struct dlmfs_inode_private *ip;
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ip = container_of(lockres,
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struct dlmfs_inode_private,
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ip_lockres);
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return &ip->ip_vfs_inode;
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}
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static inline void user_recover_from_dlm_error(struct user_lock_res *lockres)
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{
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spin_lock(&lockres->l_lock);
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lockres->l_flags &= ~USER_LOCK_BUSY;
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spin_unlock(&lockres->l_lock);
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}
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#define user_log_dlm_error(_func, _stat, _lockres) do { \
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mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
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"resource %s: %s\n", dlm_errname(_stat), _func, \
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_lockres->l_name, dlm_errmsg(_stat)); \
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} while (0)
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/* WARNING: This function lives in a world where the only three lock
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* levels are EX, PR, and NL. It *will* have to be adjusted when more
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* lock types are added. */
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static inline int user_highest_compat_lock_level(int level)
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{
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int new_level = LKM_EXMODE;
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if (level == LKM_EXMODE)
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new_level = LKM_NLMODE;
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else if (level == LKM_PRMODE)
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new_level = LKM_PRMODE;
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return new_level;
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}
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static void user_ast(void *opaque)
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{
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struct user_lock_res *lockres = opaque;
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struct dlm_lockstatus *lksb;
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mlog(0, "AST fired for lockres %s\n", lockres->l_name);
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spin_lock(&lockres->l_lock);
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lksb = &(lockres->l_lksb);
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if (lksb->status != DLM_NORMAL) {
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mlog(ML_ERROR, "lksb status value of %u on lockres %s\n",
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lksb->status, lockres->l_name);
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spin_unlock(&lockres->l_lock);
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return;
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}
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/* we're downconverting. */
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if (lockres->l_requested < lockres->l_level) {
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if (lockres->l_requested <=
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user_highest_compat_lock_level(lockres->l_blocking)) {
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lockres->l_blocking = LKM_NLMODE;
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lockres->l_flags &= ~USER_LOCK_BLOCKED;
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}
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}
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lockres->l_level = lockres->l_requested;
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lockres->l_requested = LKM_IVMODE;
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lockres->l_flags |= USER_LOCK_ATTACHED;
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lockres->l_flags &= ~USER_LOCK_BUSY;
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spin_unlock(&lockres->l_lock);
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wake_up(&lockres->l_event);
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}
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static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres)
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{
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struct inode *inode;
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inode = user_dlm_inode_from_user_lockres(lockres);
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if (!igrab(inode))
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BUG();
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}
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static void user_dlm_unblock_lock(void *opaque);
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static void __user_dlm_queue_lockres(struct user_lock_res *lockres)
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{
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if (!(lockres->l_flags & USER_LOCK_QUEUED)) {
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user_dlm_grab_inode_ref(lockres);
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INIT_WORK(&lockres->l_work, user_dlm_unblock_lock,
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lockres);
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queue_work(user_dlm_worker, &lockres->l_work);
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lockres->l_flags |= USER_LOCK_QUEUED;
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}
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}
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static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres)
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{
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int queue = 0;
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if (!(lockres->l_flags & USER_LOCK_BLOCKED))
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return;
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switch (lockres->l_blocking) {
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case LKM_EXMODE:
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if (!lockres->l_ex_holders && !lockres->l_ro_holders)
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queue = 1;
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break;
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case LKM_PRMODE:
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if (!lockres->l_ex_holders)
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queue = 1;
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break;
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default:
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BUG();
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}
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if (queue)
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__user_dlm_queue_lockres(lockres);
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}
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static void user_bast(void *opaque, int level)
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{
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struct user_lock_res *lockres = opaque;
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mlog(0, "Blocking AST fired for lockres %s. Blocking level %d\n",
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lockres->l_name, level);
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spin_lock(&lockres->l_lock);
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lockres->l_flags |= USER_LOCK_BLOCKED;
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if (level > lockres->l_blocking)
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lockres->l_blocking = level;
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__user_dlm_queue_lockres(lockres);
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spin_unlock(&lockres->l_lock);
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wake_up(&lockres->l_event);
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}
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static void user_unlock_ast(void *opaque, enum dlm_status status)
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{
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struct user_lock_res *lockres = opaque;
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mlog(0, "UNLOCK AST called on lock %s\n", lockres->l_name);
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if (status != DLM_NORMAL)
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mlog(ML_ERROR, "Dlm returns status %d\n", status);
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spin_lock(&lockres->l_lock);
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if (lockres->l_flags & USER_LOCK_IN_TEARDOWN)
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lockres->l_level = LKM_IVMODE;
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else {
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lockres->l_requested = LKM_IVMODE; /* cancel an
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* upconvert
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* request. */
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lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
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/* we want the unblock thread to look at it again
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* now. */
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__user_dlm_queue_lockres(lockres);
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}
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lockres->l_flags &= ~USER_LOCK_BUSY;
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spin_unlock(&lockres->l_lock);
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wake_up(&lockres->l_event);
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}
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static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres)
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{
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struct inode *inode;
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inode = user_dlm_inode_from_user_lockres(lockres);
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iput(inode);
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}
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static void user_dlm_unblock_lock(void *opaque)
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{
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int new_level, status;
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struct user_lock_res *lockres = (struct user_lock_res *) opaque;
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struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
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mlog(0, "processing lockres %s\n", lockres->l_name);
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spin_lock(&lockres->l_lock);
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BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
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BUG_ON(!(lockres->l_flags & USER_LOCK_QUEUED));
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/* notice that we don't clear USER_LOCK_BLOCKED here. That's
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* for user_ast to do. */
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lockres->l_flags &= ~USER_LOCK_QUEUED;
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if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) {
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mlog(0, "lock is in teardown so we do nothing\n");
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spin_unlock(&lockres->l_lock);
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goto drop_ref;
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}
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if (lockres->l_flags & USER_LOCK_BUSY) {
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mlog(0, "BUSY flag detected...\n");
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if (lockres->l_flags & USER_LOCK_IN_CANCEL) {
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spin_unlock(&lockres->l_lock);
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goto drop_ref;
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}
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lockres->l_flags |= USER_LOCK_IN_CANCEL;
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spin_unlock(&lockres->l_lock);
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status = dlmunlock(dlm,
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&lockres->l_lksb,
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LKM_CANCEL,
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user_unlock_ast,
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lockres);
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if (status == DLM_CANCELGRANT) {
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/* If we got this, then the ast was fired
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* before we could cancel. We cleanup our
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* state, and restart the function. */
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spin_lock(&lockres->l_lock);
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lockres->l_flags &= ~USER_LOCK_IN_CANCEL;
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spin_unlock(&lockres->l_lock);
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} else if (status != DLM_NORMAL)
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user_log_dlm_error("dlmunlock", status, lockres);
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goto drop_ref;
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}
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/* If there are still incompat holders, we can exit safely
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* without worrying about re-queueing this lock as that will
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* happen on the last call to user_cluster_unlock. */
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if ((lockres->l_blocking == LKM_EXMODE)
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&& (lockres->l_ex_holders || lockres->l_ro_holders)) {
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spin_unlock(&lockres->l_lock);
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mlog(0, "can't downconvert for ex: ro = %u, ex = %u\n",
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lockres->l_ro_holders, lockres->l_ex_holders);
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goto drop_ref;
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}
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if ((lockres->l_blocking == LKM_PRMODE)
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&& lockres->l_ex_holders) {
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spin_unlock(&lockres->l_lock);
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mlog(0, "can't downconvert for pr: ex = %u\n",
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lockres->l_ex_holders);
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goto drop_ref;
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}
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/* yay, we can downconvert now. */
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new_level = user_highest_compat_lock_level(lockres->l_blocking);
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lockres->l_requested = new_level;
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lockres->l_flags |= USER_LOCK_BUSY;
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mlog(0, "Downconvert lock from %d to %d\n",
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lockres->l_level, new_level);
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spin_unlock(&lockres->l_lock);
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/* need lock downconvert request now... */
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status = dlmlock(dlm,
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new_level,
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&lockres->l_lksb,
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LKM_CONVERT|LKM_VALBLK,
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lockres->l_name,
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user_ast,
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lockres,
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user_bast);
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if (status != DLM_NORMAL) {
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user_log_dlm_error("dlmlock", status, lockres);
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user_recover_from_dlm_error(lockres);
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}
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drop_ref:
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user_dlm_drop_inode_ref(lockres);
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}
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static inline void user_dlm_inc_holders(struct user_lock_res *lockres,
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int level)
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{
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switch(level) {
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case LKM_EXMODE:
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lockres->l_ex_holders++;
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break;
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case LKM_PRMODE:
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lockres->l_ro_holders++;
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break;
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default:
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BUG();
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}
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}
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/* predict what lock level we'll be dropping down to on behalf
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* of another node, and return true if the currently wanted
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* level will be compatible with it. */
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static inline int
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user_may_continue_on_blocked_lock(struct user_lock_res *lockres,
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int wanted)
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{
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BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED));
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return wanted <= user_highest_compat_lock_level(lockres->l_blocking);
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}
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int user_dlm_cluster_lock(struct user_lock_res *lockres,
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int level,
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int lkm_flags)
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{
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int status, local_flags;
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struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
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if (level != LKM_EXMODE &&
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level != LKM_PRMODE) {
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mlog(ML_ERROR, "lockres %s: invalid request!\n",
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lockres->l_name);
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status = -EINVAL;
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goto bail;
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}
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mlog(0, "lockres %s: asking for %s lock, passed flags = 0x%x\n",
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lockres->l_name,
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(level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE",
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lkm_flags);
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again:
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if (signal_pending(current)) {
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status = -ERESTARTSYS;
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goto bail;
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}
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spin_lock(&lockres->l_lock);
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/* We only compare against the currently granted level
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* here. If the lock is blocked waiting on a downconvert,
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* we'll get caught below. */
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if ((lockres->l_flags & USER_LOCK_BUSY) &&
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(level > lockres->l_level)) {
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/* is someone sitting in dlm_lock? If so, wait on
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* them. */
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spin_unlock(&lockres->l_lock);
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user_wait_on_busy_lock(lockres);
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goto again;
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}
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if ((lockres->l_flags & USER_LOCK_BLOCKED) &&
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(!user_may_continue_on_blocked_lock(lockres, level))) {
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/* is the lock is currently blocked on behalf of
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* another node */
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spin_unlock(&lockres->l_lock);
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user_wait_on_blocked_lock(lockres);
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goto again;
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}
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if (level > lockres->l_level) {
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local_flags = lkm_flags | LKM_VALBLK;
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if (lockres->l_level != LKM_IVMODE)
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local_flags |= LKM_CONVERT;
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lockres->l_requested = level;
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lockres->l_flags |= USER_LOCK_BUSY;
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spin_unlock(&lockres->l_lock);
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BUG_ON(level == LKM_IVMODE);
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BUG_ON(level == LKM_NLMODE);
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mlog(0, "lock %s, get lock from %d to level = %d\n",
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lockres->l_name, lockres->l_level, level);
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/* call dlm_lock to upgrade lock now */
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status = dlmlock(dlm,
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level,
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&lockres->l_lksb,
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local_flags,
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lockres->l_name,
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user_ast,
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lockres,
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user_bast);
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if (status != DLM_NORMAL) {
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if ((lkm_flags & LKM_NOQUEUE) &&
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(status == DLM_NOTQUEUED))
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status = -EAGAIN;
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else {
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user_log_dlm_error("dlmlock", status, lockres);
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status = -EINVAL;
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}
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user_recover_from_dlm_error(lockres);
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goto bail;
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}
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|
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mlog(0, "lock %s, successfull return from dlmlock\n",
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lockres->l_name);
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user_wait_on_busy_lock(lockres);
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goto again;
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}
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user_dlm_inc_holders(lockres, level);
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spin_unlock(&lockres->l_lock);
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mlog(0, "lockres %s: Got %s lock!\n", lockres->l_name,
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(level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE");
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status = 0;
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bail:
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return status;
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}
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|
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static inline void user_dlm_dec_holders(struct user_lock_res *lockres,
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int level)
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{
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switch(level) {
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case LKM_EXMODE:
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BUG_ON(!lockres->l_ex_holders);
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lockres->l_ex_holders--;
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break;
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case LKM_PRMODE:
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BUG_ON(!lockres->l_ro_holders);
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lockres->l_ro_holders--;
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break;
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default:
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BUG();
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}
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}
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|
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void user_dlm_cluster_unlock(struct user_lock_res *lockres,
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int level)
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{
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if (level != LKM_EXMODE &&
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level != LKM_PRMODE) {
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mlog(ML_ERROR, "lockres %s: invalid request!\n", lockres->l_name);
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return;
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}
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|
|
mlog(0, "lockres %s: dropping %s lock\n", lockres->l_name,
|
|
(level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE");
|
|
|
|
spin_lock(&lockres->l_lock);
|
|
user_dlm_dec_holders(lockres, level);
|
|
__user_dlm_cond_queue_lockres(lockres);
|
|
spin_unlock(&lockres->l_lock);
|
|
}
|
|
|
|
void user_dlm_write_lvb(struct inode *inode,
|
|
const char *val,
|
|
unsigned int len)
|
|
{
|
|
struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
|
|
char *lvb = lockres->l_lksb.lvb;
|
|
|
|
BUG_ON(len > DLM_LVB_LEN);
|
|
|
|
spin_lock(&lockres->l_lock);
|
|
|
|
BUG_ON(lockres->l_level < LKM_EXMODE);
|
|
memcpy(lvb, val, len);
|
|
|
|
spin_unlock(&lockres->l_lock);
|
|
}
|
|
|
|
void user_dlm_read_lvb(struct inode *inode,
|
|
char *val,
|
|
unsigned int len)
|
|
{
|
|
struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres;
|
|
char *lvb = lockres->l_lksb.lvb;
|
|
|
|
BUG_ON(len > DLM_LVB_LEN);
|
|
|
|
spin_lock(&lockres->l_lock);
|
|
|
|
BUG_ON(lockres->l_level < LKM_PRMODE);
|
|
memcpy(val, lvb, len);
|
|
|
|
spin_unlock(&lockres->l_lock);
|
|
}
|
|
|
|
void user_dlm_lock_res_init(struct user_lock_res *lockres,
|
|
struct dentry *dentry)
|
|
{
|
|
memset(lockres, 0, sizeof(*lockres));
|
|
|
|
spin_lock_init(&lockres->l_lock);
|
|
init_waitqueue_head(&lockres->l_event);
|
|
lockres->l_level = LKM_IVMODE;
|
|
lockres->l_requested = LKM_IVMODE;
|
|
lockres->l_blocking = LKM_IVMODE;
|
|
|
|
/* should have been checked before getting here. */
|
|
BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN);
|
|
|
|
memcpy(lockres->l_name,
|
|
dentry->d_name.name,
|
|
dentry->d_name.len);
|
|
}
|
|
|
|
int user_dlm_destroy_lock(struct user_lock_res *lockres)
|
|
{
|
|
int status = -EBUSY;
|
|
struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres);
|
|
|
|
mlog(0, "asked to destroy %s\n", lockres->l_name);
|
|
|
|
spin_lock(&lockres->l_lock);
|
|
while (lockres->l_flags & USER_LOCK_BUSY) {
|
|
spin_unlock(&lockres->l_lock);
|
|
|
|
mlog(0, "lock %s is busy\n", lockres->l_name);
|
|
|
|
user_wait_on_busy_lock(lockres);
|
|
|
|
spin_lock(&lockres->l_lock);
|
|
}
|
|
|
|
if (lockres->l_ro_holders || lockres->l_ex_holders) {
|
|
spin_unlock(&lockres->l_lock);
|
|
mlog(0, "lock %s has holders\n", lockres->l_name);
|
|
goto bail;
|
|
}
|
|
|
|
status = 0;
|
|
if (!(lockres->l_flags & USER_LOCK_ATTACHED)) {
|
|
spin_unlock(&lockres->l_lock);
|
|
mlog(0, "lock %s is not attached\n", lockres->l_name);
|
|
goto bail;
|
|
}
|
|
|
|
lockres->l_flags &= ~USER_LOCK_ATTACHED;
|
|
lockres->l_flags |= USER_LOCK_BUSY;
|
|
lockres->l_flags |= USER_LOCK_IN_TEARDOWN;
|
|
spin_unlock(&lockres->l_lock);
|
|
|
|
mlog(0, "unlocking lockres %s\n", lockres->l_name);
|
|
status = dlmunlock(dlm,
|
|
&lockres->l_lksb,
|
|
LKM_VALBLK,
|
|
user_unlock_ast,
|
|
lockres);
|
|
if (status != DLM_NORMAL) {
|
|
user_log_dlm_error("dlmunlock", status, lockres);
|
|
status = -EINVAL;
|
|
goto bail;
|
|
}
|
|
|
|
user_wait_on_busy_lock(lockres);
|
|
|
|
status = 0;
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
struct dlm_ctxt *user_dlm_register_context(struct qstr *name)
|
|
{
|
|
struct dlm_ctxt *dlm;
|
|
u32 dlm_key;
|
|
char *domain;
|
|
|
|
domain = kmalloc(name->len + 1, GFP_KERNEL);
|
|
if (!domain) {
|
|
mlog_errno(-ENOMEM);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
dlm_key = crc32_le(0, name->name, name->len);
|
|
|
|
snprintf(domain, name->len + 1, "%.*s", name->len, name->name);
|
|
|
|
dlm = dlm_register_domain(domain, dlm_key);
|
|
if (IS_ERR(dlm))
|
|
mlog_errno(PTR_ERR(dlm));
|
|
|
|
kfree(domain);
|
|
return dlm;
|
|
}
|
|
|
|
void user_dlm_unregister_context(struct dlm_ctxt *dlm)
|
|
{
|
|
dlm_unregister_domain(dlm);
|
|
}
|
|
|