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Date: Tue, 23 Dec 2008 10:58:39 -0600
From: David Teigland <teigland@...hat.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 06/10] dlm: improve how bast mode handling
The lkb bastmode value is set in the context of processing the
lock, and read by the dlm_astd thread. Because it's accessed
in these two separate contexts, the writing/reading ought to
be done under a lock. This is simple to do by setting it and
reading it when the lkb is added to and removed from dlm_astd's
callback list which is properly locked.
Signed-off-by: David Teigland <teigland@...hat.com>
---
fs/dlm/ast.c | 14 ++++++++------
fs/dlm/ast.h | 4 ++--
fs/dlm/lock.c | 8 +++-----
fs/dlm/user.c | 4 +++-
fs/dlm/user.h | 2 +-
5 files changed, 17 insertions(+), 15 deletions(-)
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index 09b167d..fbe840d 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -33,10 +33,10 @@ void dlm_del_ast(struct dlm_lkb *lkb)
spin_unlock(&ast_queue_lock);
}
-void dlm_add_ast(struct dlm_lkb *lkb, int type)
+void dlm_add_ast(struct dlm_lkb *lkb, int type, int bastmode)
{
if (lkb->lkb_flags & DLM_IFL_USER) {
- dlm_user_add_ast(lkb, type);
+ dlm_user_add_ast(lkb, type, bastmode);
return;
}
@@ -46,6 +46,8 @@ void dlm_add_ast(struct dlm_lkb *lkb, int type)
list_add_tail(&lkb->lkb_astqueue, &ast_queue);
}
lkb->lkb_ast_type |= type;
+ if (bastmode)
+ lkb->lkb_bastmode = bastmode;
spin_unlock(&ast_queue_lock);
set_bit(WAKE_ASTS, &astd_wakeflags);
@@ -59,7 +61,7 @@ static void process_asts(void)
struct dlm_lkb *lkb;
void (*cast) (void *astparam);
void (*bast) (void *astparam, int mode);
- int type = 0, found, bmode;
+ int type = 0, found, bastmode;
for (;;) {
found = 0;
@@ -74,6 +76,7 @@ static void process_asts(void)
list_del(&lkb->lkb_astqueue);
type = lkb->lkb_ast_type;
lkb->lkb_ast_type = 0;
+ bastmode = lkb->lkb_bastmode;
found = 1;
break;
}
@@ -84,13 +87,12 @@ static void process_asts(void)
cast = lkb->lkb_astfn;
bast = lkb->lkb_bastfn;
- bmode = lkb->lkb_bastmode;
if ((type & AST_COMP) && cast)
cast(lkb->lkb_astparam);
if ((type & AST_BAST) && bast)
- bast(lkb->lkb_astparam, bmode);
+ bast(lkb->lkb_astparam, bastmode);
/* this removes the reference added by dlm_add_ast
and may result in the lkb being freed */
diff --git a/fs/dlm/ast.h b/fs/dlm/ast.h
index 6ee276c..1b5fc5f 100644
--- a/fs/dlm/ast.h
+++ b/fs/dlm/ast.h
@@ -1,7 +1,7 @@
/******************************************************************************
*******************************************************************************
**
-** Copyright (C) 2005 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -13,7 +13,7 @@
#ifndef __ASTD_DOT_H__
#define __ASTD_DOT_H__
-void dlm_add_ast(struct dlm_lkb *lkb, int type);
+void dlm_add_ast(struct dlm_lkb *lkb, int type, int bastmode);
void dlm_del_ast(struct dlm_lkb *lkb);
void dlm_astd_wake(void);
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 724ddac..7b758da 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -307,7 +307,7 @@ static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
lkb->lkb_lksb->sb_status = rv;
lkb->lkb_lksb->sb_flags = lkb->lkb_sbflags;
- dlm_add_ast(lkb, AST_COMP);
+ dlm_add_ast(lkb, AST_COMP, 0);
}
static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb)
@@ -320,10 +320,8 @@ static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode)
{
if (is_master_copy(lkb))
send_bast(r, lkb, rqmode);
- else {
- lkb->lkb_bastmode = rqmode;
- dlm_add_ast(lkb, AST_BAST);
- }
+ else
+ dlm_add_ast(lkb, AST_BAST, rqmode);
}
/*
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index b3832c6..065149e 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -175,7 +175,7 @@ static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type)
/* we could possibly check if the cancel of an orphan has resulted in the lkb
being removed and then remove that lkb from the orphans list and free it */
-void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
+void dlm_user_add_ast(struct dlm_lkb *lkb, int type, int bastmode)
{
struct dlm_ls *ls;
struct dlm_user_args *ua;
@@ -208,6 +208,8 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
ast_type = lkb->lkb_ast_type;
lkb->lkb_ast_type |= type;
+ if (bastmode)
+ lkb->lkb_bastmode = bastmode;
if (!ast_type) {
kref_get(&lkb->lkb_ref);
diff --git a/fs/dlm/user.h b/fs/dlm/user.h
index 35eb6a1..1c96864 100644
--- a/fs/dlm/user.h
+++ b/fs/dlm/user.h
@@ -9,7 +9,7 @@
#ifndef __USER_DOT_H__
#define __USER_DOT_H__
-void dlm_user_add_ast(struct dlm_lkb *lkb, int type);
+void dlm_user_add_ast(struct dlm_lkb *lkb, int type, int bastmode);
int dlm_user_init(void);
void dlm_user_exit(void);
int dlm_device_deregister(struct dlm_ls *ls);
--
1.5.5.1
--
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