2008-01-29 18:37:32 -07:00
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/* -*- 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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* stackglue.c
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*
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* Code which implements an OCFS2 specific interface to underlying
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* cluster stacks.
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*
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* Copyright (C) 2007 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, version 2.
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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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2008-02-01 15:39:35 -07:00
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#include <linux/slab.h>
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#include <linux/crc32.h>
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/* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
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#include <linux/fs.h>
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2008-02-01 13:15:37 -07:00
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#include "cluster/masklog.h"
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2008-01-29 18:37:32 -07:00
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#include "stackglue.h"
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static struct ocfs2_locking_protocol *lproto;
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2008-02-01 15:39:35 -07:00
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struct o2dlm_private {
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struct dlm_eviction_cb op_eviction_cb;
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};
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2008-02-01 13:14:57 -07:00
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/* These should be identical */
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#if (DLM_LOCK_IV != LKM_IVMODE)
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# error Lock modes do not match
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#endif
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#if (DLM_LOCK_NL != LKM_NLMODE)
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# error Lock modes do not match
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#endif
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#if (DLM_LOCK_CR != LKM_CRMODE)
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# error Lock modes do not match
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#endif
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#if (DLM_LOCK_CW != LKM_CWMODE)
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# error Lock modes do not match
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#endif
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#if (DLM_LOCK_PR != LKM_PRMODE)
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# error Lock modes do not match
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#endif
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#if (DLM_LOCK_PW != LKM_PWMODE)
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# error Lock modes do not match
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#endif
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#if (DLM_LOCK_EX != LKM_EXMODE)
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# error Lock modes do not match
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#endif
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static inline int mode_to_o2dlm(int mode)
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{
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BUG_ON(mode > LKM_MAXMODE);
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return mode;
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}
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#define map_flag(_generic, _o2dlm) \
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if (flags & (_generic)) { \
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flags &= ~(_generic); \
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o2dlm_flags |= (_o2dlm); \
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}
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static int flags_to_o2dlm(u32 flags)
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{
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int o2dlm_flags = 0;
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map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE);
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map_flag(DLM_LKF_CANCEL, LKM_CANCEL);
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map_flag(DLM_LKF_CONVERT, LKM_CONVERT);
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map_flag(DLM_LKF_VALBLK, LKM_VALBLK);
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map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK);
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map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN);
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map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE);
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map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT);
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map_flag(DLM_LKF_LOCAL, LKM_LOCAL);
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/* map_flag() should have cleared every flag passed in */
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BUG_ON(flags != 0);
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return o2dlm_flags;
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}
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#undef map_flag
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2008-02-01 13:15:37 -07:00
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/*
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* Map an o2dlm status to standard errno values.
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*
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* o2dlm only uses a handful of these, and returns even fewer to the
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* caller. Still, we try to assign sane values to each error.
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*
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* The following value pairs have special meanings to dlmglue, thus
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* the right hand side needs to stay unique - never duplicate the
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* mapping elsewhere in the table!
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*
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* DLM_NORMAL: 0
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* DLM_NOTQUEUED: -EAGAIN
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* DLM_CANCELGRANT: -DLM_ECANCEL
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* DLM_CANCEL: -DLM_EUNLOCK
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*/
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/* Keep in sync with dlmapi.h */
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static int status_map[] = {
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[DLM_NORMAL] = 0, /* Success */
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[DLM_GRANTED] = -EINVAL,
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[DLM_DENIED] = -EACCES,
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[DLM_DENIED_NOLOCKS] = -EACCES,
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[DLM_WORKING] = -EBUSY,
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[DLM_BLOCKED] = -EINVAL,
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[DLM_BLOCKED_ORPHAN] = -EINVAL,
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[DLM_DENIED_GRACE_PERIOD] = -EACCES,
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[DLM_SYSERR] = -ENOMEM, /* It is what it is */
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[DLM_NOSUPPORT] = -EPROTO,
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[DLM_CANCELGRANT] = -DLM_ECANCEL, /* Cancel after grant */
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[DLM_IVLOCKID] = -EINVAL,
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[DLM_SYNC] = -EINVAL,
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[DLM_BADTYPE] = -EINVAL,
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[DLM_BADRESOURCE] = -EINVAL,
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[DLM_MAXHANDLES] = -ENOMEM,
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[DLM_NOCLINFO] = -EINVAL,
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[DLM_NOLOCKMGR] = -EINVAL,
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[DLM_NOPURGED] = -EINVAL,
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[DLM_BADARGS] = -EINVAL,
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[DLM_VOID] = -EINVAL,
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[DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */
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[DLM_IVBUFLEN] = -EINVAL,
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[DLM_CVTUNGRANT] = -EPERM,
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[DLM_BADPARAM] = -EINVAL,
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[DLM_VALNOTVALID] = -EINVAL,
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[DLM_REJECTED] = -EPERM,
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[DLM_ABORT] = -EINVAL,
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[DLM_CANCEL] = -DLM_EUNLOCK, /* Successful cancel */
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[DLM_IVRESHANDLE] = -EINVAL,
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[DLM_DEADLOCK] = -EDEADLK,
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[DLM_DENIED_NOASTS] = -EINVAL,
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[DLM_FORWARD] = -EINVAL,
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[DLM_TIMEOUT] = -ETIMEDOUT,
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[DLM_IVGROUPID] = -EINVAL,
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[DLM_VERS_CONFLICT] = -EOPNOTSUPP,
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[DLM_BAD_DEVICE_PATH] = -ENOENT,
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[DLM_NO_DEVICE_PERMISSION] = -EPERM,
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[DLM_NO_CONTROL_DEVICE] = -ENOENT,
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[DLM_RECOVERING] = -ENOTCONN,
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[DLM_MIGRATING] = -ERESTART,
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[DLM_MAXSTATS] = -EINVAL,
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};
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static int dlm_status_to_errno(enum dlm_status status)
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{
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BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0])));
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return status_map[status];
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}
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static void o2dlm_lock_ast_wrapper(void *astarg)
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{
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BUG_ON(lproto == NULL);
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lproto->lp_lock_ast(astarg);
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}
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static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
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{
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BUG_ON(lproto == NULL);
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lproto->lp_blocking_ast(astarg, level);
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}
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static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
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{
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int error;
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BUG_ON(lproto == NULL);
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/*
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* XXX: CANCEL values are sketchy.
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*
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* Currently we have preserved the o2dlm paradigm. You can get
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* unlock_ast() whether the cancel succeded or not.
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*
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* First, we're going to pass DLM_EUNLOCK just like fs/dlm does for
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* successful unlocks. That is a clean behavior.
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*
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* In o2dlm, you can get both the lock_ast() for the lock being
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* granted and the unlock_ast() for the CANCEL failing. A
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* successful cancel sends DLM_NORMAL here. If the
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* lock grant happened before the cancel arrived, you get
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* DLM_CANCELGRANT. For now, we'll use DLM_ECANCEL to signify
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* CANCELGRANT - the CANCEL was supposed to happen but didn't. We
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* can then use DLM_EUNLOCK to signify a successful CANCEL -
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* effectively, the CANCEL caused the lock to roll back.
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*
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* In the future, we will likely move the o2dlm to send only one
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* ast - either unlock_ast() for a successful CANCEL or lock_ast()
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* when the grant succeeds. At that point, we'll send DLM_ECANCEL
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* for all cancel results (CANCELGRANT will no longer exist).
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*/
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error = dlm_status_to_errno(status);
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/* Successful unlock is DLM_EUNLOCK */
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if (!error)
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error = -DLM_EUNLOCK;
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lproto->lp_unlock_ast(astarg, error);
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}
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2008-02-01 15:39:35 -07:00
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int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
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2008-01-29 18:37:32 -07:00
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int mode,
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2008-02-01 13:16:57 -07:00
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union ocfs2_dlm_lksb *lksb,
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2008-01-29 18:37:32 -07:00
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u32 flags,
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void *name,
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unsigned int namelen,
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void *astarg)
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{
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2008-02-01 13:15:37 -07:00
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enum dlm_status status;
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2008-02-01 13:14:57 -07:00
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int o2dlm_mode = mode_to_o2dlm(mode);
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int o2dlm_flags = flags_to_o2dlm(flags);
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2008-02-01 13:15:37 -07:00
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int ret;
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2008-02-01 13:14:57 -07:00
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2008-01-29 18:37:32 -07:00
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BUG_ON(lproto == NULL);
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2008-02-01 13:14:57 -07:00
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2008-02-01 15:39:35 -07:00
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status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm,
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o2dlm_flags, name, namelen,
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2008-02-01 13:16:57 -07:00
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o2dlm_lock_ast_wrapper, astarg,
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o2dlm_blocking_ast_wrapper);
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2008-02-01 13:15:37 -07:00
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ret = dlm_status_to_errno(status);
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return ret;
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2008-01-29 18:37:32 -07:00
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}
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2008-02-01 15:39:35 -07:00
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int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
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2008-02-01 13:16:57 -07:00
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union ocfs2_dlm_lksb *lksb,
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2008-01-29 18:37:32 -07:00
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u32 flags,
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void *astarg)
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{
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2008-02-01 13:15:37 -07:00
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enum dlm_status status;
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2008-02-01 13:14:57 -07:00
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int o2dlm_flags = flags_to_o2dlm(flags);
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2008-02-01 13:15:37 -07:00
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int ret;
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2008-02-01 13:14:57 -07:00
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2008-01-29 18:37:32 -07:00
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BUG_ON(lproto == NULL);
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2008-02-01 15:39:35 -07:00
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status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm,
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o2dlm_flags, o2dlm_unlock_ast_wrapper, astarg);
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2008-02-01 13:15:37 -07:00
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ret = dlm_status_to_errno(status);
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return ret;
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2008-01-29 18:37:32 -07:00
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}
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2008-02-01 13:16:57 -07:00
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int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb)
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{
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return dlm_status_to_errno(lksb->lksb_o2dlm.status);
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}
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/*
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* Why don't we cast to ocfs2_meta_lvb? The "clean" answer is that we
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* don't cast at the glue level. The real answer is that the header
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* ordering is nigh impossible.
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*/
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void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb)
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{
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return (void *)(lksb->lksb_o2dlm.lvb);
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}
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2008-01-29 18:37:32 -07:00
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2008-02-01 15:39:35 -07:00
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/*
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* Called from the dlm when it's about to evict a node. This is how the
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* classic stack signals node death.
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*/
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static void o2dlm_eviction_cb(int node_num, void *data)
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{
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struct ocfs2_cluster_connection *conn = data;
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mlog(ML_NOTICE, "o2dlm has evicted node %d from group %.*s\n",
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node_num, conn->cc_namelen, conn->cc_name);
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conn->cc_recovery_handler(node_num, conn->cc_recovery_data);
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}
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int ocfs2_cluster_connect(const char *group,
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int grouplen,
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void (*recovery_handler)(int node_num,
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|
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void *recovery_data),
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void *recovery_data,
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|
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struct ocfs2_cluster_connection **conn)
|
|
|
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{
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|
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int rc = 0;
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|
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struct ocfs2_cluster_connection *new_conn;
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|
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u32 dlm_key;
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|
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struct dlm_ctxt *dlm;
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|
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struct o2dlm_private *priv;
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|
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struct dlm_protocol_version dlm_version;
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BUG_ON(group == NULL);
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BUG_ON(conn == NULL);
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BUG_ON(recovery_handler == NULL);
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if (grouplen > GROUP_NAME_MAX) {
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rc = -EINVAL;
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goto out;
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}
|
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|
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new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection),
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|
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GFP_KERNEL);
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if (!new_conn) {
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rc = -ENOMEM;
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goto out;
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}
|
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memcpy(new_conn->cc_name, group, grouplen);
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new_conn->cc_namelen = grouplen;
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new_conn->cc_recovery_handler = recovery_handler;
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new_conn->cc_recovery_data = recovery_data;
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/* Start the new connection at our maximum compatibility level */
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|
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new_conn->cc_version = lproto->lp_max_version;
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|
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priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL);
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if (!priv) {
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|
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rc = -ENOMEM;
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|
|
goto out_free;
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|
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}
|
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|
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|
|
/* This just fills the structure in. It is safe to use new_conn. */
|
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|
|
dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb,
|
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|
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new_conn);
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new_conn->cc_private = priv;
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|
|
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|
|
/* used by the dlm code to make message headers unique, each
|
|
|
|
* node in this domain must agree on this. */
|
|
|
|
dlm_key = crc32_le(0, group, grouplen);
|
|
|
|
dlm_version.pv_major = new_conn->cc_version.pv_major;
|
|
|
|
dlm_version.pv_minor = new_conn->cc_version.pv_minor;
|
|
|
|
|
|
|
|
dlm = dlm_register_domain(group, dlm_key, &dlm_version);
|
|
|
|
if (IS_ERR(dlm)) {
|
|
|
|
rc = PTR_ERR(dlm);
|
|
|
|
mlog_errno(rc);
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
|
|
|
|
new_conn->cc_version.pv_major = dlm_version.pv_major;
|
|
|
|
new_conn->cc_version.pv_minor = dlm_version.pv_minor;
|
|
|
|
new_conn->cc_lockspace = dlm;
|
|
|
|
|
|
|
|
dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
|
|
|
|
|
|
|
|
*conn = new_conn;
|
|
|
|
|
|
|
|
out_free:
|
|
|
|
if (rc) {
|
|
|
|
kfree(new_conn->cc_private);
|
|
|
|
kfree(new_conn);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn)
|
|
|
|
{
|
|
|
|
struct dlm_ctxt *dlm = conn->cc_lockspace;
|
|
|
|
struct o2dlm_private *priv = conn->cc_private;
|
|
|
|
|
|
|
|
dlm_unregister_eviction_cb(&priv->op_eviction_cb);
|
|
|
|
dlm_unregister_domain(dlm);
|
|
|
|
|
|
|
|
kfree(priv);
|
|
|
|
kfree(conn);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-29 18:37:32 -07:00
|
|
|
void o2cb_get_stack(struct ocfs2_locking_protocol *proto)
|
|
|
|
{
|
|
|
|
BUG_ON(proto == NULL);
|
|
|
|
|
|
|
|
lproto = proto;
|
|
|
|
}
|
|
|
|
|
|
|
|
void o2cb_put_stack(void)
|
|
|
|
{
|
|
|
|
lproto = NULL;
|
|
|
|
}
|