c36258b592
Introduce a per-lockspace rwsem that's held in read mode by dlm_recv threads while working in the dlm. This allows dlm_recv activity to be suspended when the lockspace transitions to, from and between recovery cycles. The specific bug prompting this change is one where an in-progress recovery cycle is aborted by a new recovery cycle. While dlm_recv was processing a recovery message, the recovery cycle was aborted and dlm_recoverd began cleaning up. dlm_recv decremented recover_locks_count on an rsb after dlm_recoverd had reset it to zero. This is fixed by suspending dlm_recv (taking write lock on the rwsem) before aborting the current recovery. The transitions to/from normal and recovery modes are simplified by using this new ability to block dlm_recv. The switch from normal to recovery mode means dlm_recv goes from processing locking messages, to saving them for later, and vice versa. Races are avoided by blocking dlm_recv when setting the flag that switches between modes. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
25 lines
1.1 KiB
C
25 lines
1.1 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2005-2007 Red Hat, Inc. All rights reserved.
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**
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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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** of the GNU General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
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#ifndef __RCOM_DOT_H__
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#define __RCOM_DOT_H__
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int dlm_rcom_status(struct dlm_ls *ls, int nodeid);
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int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name,int last_len);
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int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid);
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int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
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void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid);
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int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in);
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#endif
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