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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 "cluster/masklog.h"
#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
/*
* Map an o2dlm status to standard errno values.
*
* o2dlm only uses a handful of these, and returns even fewer to the
* caller. Still, we try to assign sane values to each error.
*
* The following value pairs have special meanings to dlmglue, thus
* the right hand side needs to stay unique - never duplicate the
* mapping elsewhere in the table!
*
* DLM_NORMAL: 0
* DLM_NOTQUEUED: -EAGAIN
* DLM_CANCELGRANT: -DLM_ECANCEL
* DLM_CANCEL: -DLM_EUNLOCK
*/
/* Keep in sync with dlmapi.h */
static int status_map[] = {
[DLM_NORMAL] = 0, /* Success */
[DLM_GRANTED] = -EINVAL,
[DLM_DENIED] = -EACCES,
[DLM_DENIED_NOLOCKS] = -EACCES,
[DLM_WORKING] = -EBUSY,
[DLM_BLOCKED] = -EINVAL,
[DLM_BLOCKED_ORPHAN] = -EINVAL,
[DLM_DENIED_GRACE_PERIOD] = -EACCES,
[DLM_SYSERR] = -ENOMEM, /* It is what it is */
[DLM_NOSUPPORT] = -EPROTO,
[DLM_CANCELGRANT] = -DLM_ECANCEL, /* Cancel after grant */
[DLM_IVLOCKID] = -EINVAL,
[DLM_SYNC] = -EINVAL,
[DLM_BADTYPE] = -EINVAL,
[DLM_BADRESOURCE] = -EINVAL,
[DLM_MAXHANDLES] = -ENOMEM,
[DLM_NOCLINFO] = -EINVAL,
[DLM_NOLOCKMGR] = -EINVAL,
[DLM_NOPURGED] = -EINVAL,
[DLM_BADARGS] = -EINVAL,
[DLM_VOID] = -EINVAL,
[DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */
[DLM_IVBUFLEN] = -EINVAL,
[DLM_CVTUNGRANT] = -EPERM,
[DLM_BADPARAM] = -EINVAL,
[DLM_VALNOTVALID] = -EINVAL,
[DLM_REJECTED] = -EPERM,
[DLM_ABORT] = -EINVAL,
[DLM_CANCEL] = -DLM_EUNLOCK, /* Successful cancel */
[DLM_IVRESHANDLE] = -EINVAL,
[DLM_DEADLOCK] = -EDEADLK,
[DLM_DENIED_NOASTS] = -EINVAL,
[DLM_FORWARD] = -EINVAL,
[DLM_TIMEOUT] = -ETIMEDOUT,
[DLM_IVGROUPID] = -EINVAL,
[DLM_VERS_CONFLICT] = -EOPNOTSUPP,
[DLM_BAD_DEVICE_PATH] = -ENOENT,
[DLM_NO_DEVICE_PERMISSION] = -EPERM,
[DLM_NO_CONTROL_DEVICE] = -ENOENT,
[DLM_RECOVERING] = -ENOTCONN,
[DLM_MIGRATING] = -ERESTART,
[DLM_MAXSTATS] = -EINVAL,
};
static int dlm_status_to_errno(enum dlm_status status)
{
BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0])));
return status_map[status];
}
static void o2dlm_lock_ast_wrapper(void *astarg)
{
BUG_ON(lproto == NULL);
lproto->lp_lock_ast(astarg);
}
static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
{
BUG_ON(lproto == NULL);
lproto->lp_blocking_ast(astarg, level);
}
static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
{
int error;
BUG_ON(lproto == NULL);
/*
* XXX: CANCEL values are sketchy.
*
* Currently we have preserved the o2dlm paradigm. You can get
* unlock_ast() whether the cancel succeded or not.
*
* First, we're going to pass DLM_EUNLOCK just like fs/dlm does for
* successful unlocks. That is a clean behavior.
*
* In o2dlm, you can get both the lock_ast() for the lock being
* granted and the unlock_ast() for the CANCEL failing. A
* successful cancel sends DLM_NORMAL here. If the
* lock grant happened before the cancel arrived, you get
* DLM_CANCELGRANT. For now, we'll use DLM_ECANCEL to signify
* CANCELGRANT - the CANCEL was supposed to happen but didn't. We
* can then use DLM_EUNLOCK to signify a successful CANCEL -
* effectively, the CANCEL caused the lock to roll back.
*
* In the future, we will likely move the o2dlm to send only one
* ast - either unlock_ast() for a successful CANCEL or lock_ast()
* when the grant succeeds. At that point, we'll send DLM_ECANCEL
* for all cancel results (CANCELGRANT will no longer exist).
*/
error = dlm_status_to_errno(status);
/* Successful unlock is DLM_EUNLOCK */
if (!error)
error = -DLM_EUNLOCK;
lproto->lp_unlock_ast(astarg, error);
}
int ocfs2_dlm_lock(struct dlm_ctxt *dlm,
int mode,
struct dlm_lockstatus *lksb,
u32 flags,
void *name,
unsigned int namelen,
void *astarg)
{
enum dlm_status status;
int o2dlm_mode = mode_to_o2dlm(mode);
int o2dlm_flags = flags_to_o2dlm(flags);
int ret;
BUG_ON(lproto == NULL);
status = dlmlock(dlm, o2dlm_mode, lksb, o2dlm_flags, name, namelen,
o2dlm_lock_ast_wrapper, astarg,
o2dlm_blocking_ast_wrapper);
ret = dlm_status_to_errno(status);
return ret;
}
int ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
struct dlm_lockstatus *lksb,
u32 flags,
void *astarg)
{
enum dlm_status status;
int o2dlm_flags = flags_to_o2dlm(flags);
int ret;
BUG_ON(lproto == NULL);
status = dlmunlock(dlm, lksb, o2dlm_flags,
o2dlm_unlock_ast_wrapper, astarg);
ret = dlm_status_to_errno(status);
return ret;
}
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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