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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* stackglue.c
*
* Code which implements an OCFS2 specific interface to underlying
* cluster stacks.
*
* Copyright (C) 2007 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, version 2.
*
* 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.
*/
#include "stackglue.h"
static struct ocfs2_locking_protocol *lproto;
/* These should be identical */
#if (DLM_LOCK_IV != LKM_IVMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_NL != LKM_NLMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_CR != LKM_CRMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_CW != LKM_CWMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_PR != LKM_PRMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_PW != LKM_PWMODE)
# error Lock modes do not match
#endif
#if (DLM_LOCK_EX != LKM_EXMODE)
# error Lock modes do not match
#endif
static inline int mode_to_o2dlm(int mode)
{
BUG_ON(mode > LKM_MAXMODE);
return mode;
}
#define map_flag(_generic, _o2dlm) \
if (flags & (_generic)) { \
flags &= ~(_generic); \
o2dlm_flags |= (_o2dlm); \
}
static int flags_to_o2dlm(u32 flags)
{
int o2dlm_flags = 0;
map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE);
map_flag(DLM_LKF_CANCEL, LKM_CANCEL);
map_flag(DLM_LKF_CONVERT, LKM_CONVERT);
map_flag(DLM_LKF_VALBLK, LKM_VALBLK);
map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK);
map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN);
map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE);
map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT);
map_flag(DLM_LKF_LOCAL, LKM_LOCAL);
/* map_flag() should have cleared every flag passed in */
BUG_ON(flags != 0);
return o2dlm_flags;
}
#undef map_flag
enum dlm_status ocfs2_dlm_lock(struct dlm_ctxt *dlm,
int mode,
struct dlm_lockstatus *lksb,
u32 flags,
void *name,
unsigned int namelen,
void *astarg)
{
int o2dlm_mode = mode_to_o2dlm(mode);
int o2dlm_flags = flags_to_o2dlm(flags);
BUG_ON(lproto == NULL);
return dlmlock(dlm, o2dlm_mode, lksb, o2dlm_flags, name, namelen,
lproto->lp_lock_ast, astarg,
lproto->lp_blocking_ast);
}
enum dlm_status ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
struct dlm_lockstatus *lksb,
u32 flags,
void *astarg)
{
int o2dlm_flags = flags_to_o2dlm(flags);
BUG_ON(lproto == NULL);
return dlmunlock(dlm, lksb, o2dlm_flags,
lproto->lp_unlock_ast, astarg);
}
void o2cb_get_stack(struct ocfs2_locking_protocol *proto)
{
BUG_ON(proto == NULL);
lproto = proto;
}
void o2cb_put_stack(void)
{
lproto = NULL;
}
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