mirror of https://gitee.com/openkylin/linux.git
266 lines
7.0 KiB
C
266 lines
7.0 KiB
C
/* -*- 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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#include "cluster/masklog.h"
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#include "stackglue.h"
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static struct ocfs2_locking_protocol *lproto;
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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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/*
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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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int ocfs2_dlm_lock(struct dlm_ctxt *dlm,
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int mode,
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union ocfs2_dlm_lksb *lksb,
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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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enum dlm_status status;
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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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int ret;
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BUG_ON(lproto == NULL);
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status = dlmlock(dlm, o2dlm_mode, &lksb->lksb_o2dlm, o2dlm_flags,
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name, namelen,
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o2dlm_lock_ast_wrapper, astarg,
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o2dlm_blocking_ast_wrapper);
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ret = dlm_status_to_errno(status);
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return ret;
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}
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int ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
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union ocfs2_dlm_lksb *lksb,
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u32 flags,
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void *astarg)
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{
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enum dlm_status status;
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int o2dlm_flags = flags_to_o2dlm(flags);
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int ret;
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BUG_ON(lproto == NULL);
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status = dlmunlock(dlm, &lksb->lksb_o2dlm, o2dlm_flags,
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o2dlm_unlock_ast_wrapper, astarg);
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ret = dlm_status_to_errno(status);
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return ret;
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}
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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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void o2cb_get_stack(struct ocfs2_locking_protocol *proto)
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{
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BUG_ON(proto == NULL);
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lproto = proto;
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}
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void o2cb_put_stack(void)
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{
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lproto = NULL;
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}
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