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| author | David Teigland <teigland@redhat.com> | 2007-09-27 15:53:38 -0500 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2007-10-10 08:56:38 +0100 |
| commit | c36258b5925e6cf6bf72904635100593573bfcff (patch) | |
| tree | 565f1ce29a7f8a2cd1c25f2d36c932727adbdbc2 /fs/dlm/rcom.h | |
| parent | b434eda6fda5bcdcc2dd918e5ffbf7184f2d4e17 (diff) | |
| download | linux-stable-c36258b5925e6cf6bf72904635100593573bfcff.tar.gz linux-stable-c36258b5925e6cf6bf72904635100593573bfcff.tar.bz2 linux-stable-c36258b5925e6cf6bf72904635100593573bfcff.zip | |
[DLM] block dlm_recv in recovery transition
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>
Diffstat (limited to 'fs/dlm/rcom.h')
| -rw-r--r-- | fs/dlm/rcom.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/dlm/rcom.h b/fs/dlm/rcom.h index d7984321ff41..b09abd29ba38 100644 --- a/fs/dlm/rcom.h +++ b/fs/dlm/rcom.h @@ -2,7 +2,7 @@ ******************************************************************************* ** ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. -** Copyright (C) 2005 Red Hat, Inc. All rights reserved. +** Copyright (C) 2005-2007 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 @@ -18,7 +18,8 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid); int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name,int last_len); int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid); int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); -void dlm_receive_rcom(struct dlm_header *hd, int nodeid); +void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid); +int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in); #endif |