From fd22a51bcc0b7b76fc729b02316214fd979f9fe1 Mon Sep 17 00:00:00 2001 From: David Teigland Date: Tue, 9 Dec 2008 11:55:46 -0600 Subject: 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 --- 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(-) (limited to 'fs') 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); -- cgit v1.1