421 lines
11 KiB
C
421 lines
11 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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* stack_o2cb.c
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*
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* Code which interfaces ocfs2 with the o2cb stack.
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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 <linux/crc32.h>
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#include <linux/module.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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#include "cluster/masklog.h"
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#include "cluster/nodemanager.h"
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#include "cluster/heartbeat.h"
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#include "stackglue.h"
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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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static struct ocfs2_stack_plugin o2cb_stack;
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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: -EBUSY
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* DLM_CANCEL: -DLM_ECANCEL
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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] = -EACCES,
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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] = -EBUSY, /* 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_ECANCEL, /* 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(o2cb_stack.sp_proto == NULL);
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o2cb_stack.sp_proto->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(o2cb_stack.sp_proto == NULL);
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o2cb_stack.sp_proto->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 = dlm_status_to_errno(status);
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BUG_ON(o2cb_stack.sp_proto == NULL);
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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.
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*
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* There's no need for the double-ast. If we see DLM_CANCELGRANT,
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* we just ignore it. We expect the lock_ast() to handle the
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* granted lock.
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*/
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if (status == DLM_CANCELGRANT)
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return;
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o2cb_stack.sp_proto->lp_unlock_ast(astarg, error);
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}
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static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
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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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status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm,
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o2dlm_flags, 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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static int o2cb_dlm_unlock(struct ocfs2_cluster_connection *conn,
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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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status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm,
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o2dlm_flags, 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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static int o2cb_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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static void *o2cb_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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static void o2cb_dump_lksb(union ocfs2_dlm_lksb *lksb)
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{
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dlm_print_one_lock(lksb->lksb_o2dlm.lockid);
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}
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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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static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
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{
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int rc = 0;
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u32 dlm_key;
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struct dlm_ctxt *dlm;
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struct o2dlm_private *priv;
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struct dlm_protocol_version dlm_version;
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BUG_ON(conn == NULL);
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BUG_ON(o2cb_stack.sp_proto == NULL);
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/* for now we only have one cluster/node, make sure we see it
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* in the heartbeat universe */
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if (!o2hb_check_local_node_heartbeating()) {
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rc = -EINVAL;
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goto out;
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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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rc = -ENOMEM;
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goto out_free;
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}
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/* This just fills the structure in. It is safe to pass conn. */
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dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb,
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conn);
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conn->cc_private = priv;
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/* used by the dlm code to make message headers unique, each
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* node in this domain must agree on this. */
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dlm_key = crc32_le(0, conn->cc_name, conn->cc_namelen);
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dlm_version.pv_major = conn->cc_version.pv_major;
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dlm_version.pv_minor = conn->cc_version.pv_minor;
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dlm = dlm_register_domain(conn->cc_name, dlm_key, &dlm_version);
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if (IS_ERR(dlm)) {
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rc = PTR_ERR(dlm);
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mlog_errno(rc);
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goto out_free;
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}
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conn->cc_version.pv_major = dlm_version.pv_major;
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conn->cc_version.pv_minor = dlm_version.pv_minor;
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conn->cc_lockspace = dlm;
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dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
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out_free:
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if (rc && conn->cc_private)
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kfree(conn->cc_private);
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out:
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return rc;
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}
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static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn,
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int hangup_pending)
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{
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struct dlm_ctxt *dlm = conn->cc_lockspace;
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struct o2dlm_private *priv = conn->cc_private;
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dlm_unregister_eviction_cb(&priv->op_eviction_cb);
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conn->cc_private = NULL;
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kfree(priv);
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dlm_unregister_domain(dlm);
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conn->cc_lockspace = NULL;
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return 0;
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}
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static void o2hb_stop(const char *group)
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{
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int ret;
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char *argv[5], *envp[3];
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argv[0] = (char *)o2nm_get_hb_ctl_path();
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argv[1] = "-K";
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argv[2] = "-u";
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argv[3] = (char *)group;
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argv[4] = NULL;
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mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
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/* minimal command environment taken from cpu_run_sbin_hotplug */
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envp[0] = "HOME=/";
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envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
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envp[2] = NULL;
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ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
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if (ret < 0)
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mlog_errno(ret);
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}
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/*
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* Hangup is a hack for tools compatibility. Older ocfs2-tools software
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* expects the filesystem to call "ocfs2_hb_ctl" during unmount. This
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* happens regardless of whether the DLM got started, so we can't do it
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* in ocfs2_cluster_disconnect(). We bring the o2hb_stop() function into
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* the glue and provide a "hangup" API for super.c to call.
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*
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* Other stacks will eventually provide a NULL ->hangup() pointer.
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*/
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static void o2cb_cluster_hangup(const char *group, int grouplen)
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{
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o2hb_stop(group);
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}
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static int o2cb_cluster_this_node(unsigned int *node)
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{
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int node_num;
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node_num = o2nm_this_node();
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if (node_num == O2NM_INVALID_NODE_NUM)
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return -ENOENT;
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if (node_num >= O2NM_MAX_NODES)
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return -EOVERFLOW;
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*node = node_num;
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return 0;
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}
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static struct ocfs2_stack_operations o2cb_stack_ops = {
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.connect = o2cb_cluster_connect,
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.disconnect = o2cb_cluster_disconnect,
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.hangup = o2cb_cluster_hangup,
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.this_node = o2cb_cluster_this_node,
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.dlm_lock = o2cb_dlm_lock,
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.dlm_unlock = o2cb_dlm_unlock,
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.lock_status = o2cb_dlm_lock_status,
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.lock_lvb = o2cb_dlm_lvb,
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.dump_lksb = o2cb_dump_lksb,
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};
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static struct ocfs2_stack_plugin o2cb_stack = {
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.sp_name = "o2cb",
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.sp_ops = &o2cb_stack_ops,
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.sp_owner = THIS_MODULE,
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};
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static int __init o2cb_stack_init(void)
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{
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return ocfs2_stack_glue_register(&o2cb_stack);
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}
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static void __exit o2cb_stack_exit(void)
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{
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ocfs2_stack_glue_unregister(&o2cb_stack);
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}
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MODULE_AUTHOR("Oracle");
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MODULE_DESCRIPTION("ocfs2 driver for the classic o2cb stack");
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MODULE_LICENSE("GPL");
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module_init(o2cb_stack_init);
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module_exit(o2cb_stack_exit);
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