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authorDavid Teigland <teigland@redhat.com>2006-10-31 11:56:08 -0600
committerSteven Whitehouse <swhiteho@redhat.com>2006-11-30 10:35:16 -0500
commit2cdc98aaf072d573df10c503d3b3b0b74e2a6d06 (patch)
treec8f0ed478c6384da504026ce2668ed916b01a6af /fs/dlm
parent91c0dc93a1a6bbdd79707ed311e48b4397df177f (diff)
downloadop-kernel-dev-2cdc98aaf072d573df10c503d3b3b0b74e2a6d06.zip
op-kernel-dev-2cdc98aaf072d573df10c503d3b3b0b74e2a6d06.tar.gz
[DLM] fix stopping unstarted recovery
Red Hat BZ 211914 When many nodes are joining a lockspace simultaneously, the dlm gets a quick sequence of stop/start events, a pair for adding each node. dlm_controld in user space sends dlm_recoverd in the kernel each stop and start event. dlm_controld will sometimes send the stop before dlm_recoverd has had a chance to take up the previously queued start. The stop aborts the processing of the previous start by setting the RECOVERY_STOP flag. dlm_recoverd is erroneously clearing this flag and ignoring the stop/abort if it happens to take up the start after the stop meant to abort it. The fix is to check the sequence number that's incremented for each stop/start before clearing the flag. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/recoverd.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c
index 4a1d602..6e4ee94 100644
--- a/fs/dlm/recoverd.c
+++ b/fs/dlm/recoverd.c
@@ -219,6 +219,10 @@ static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv)
return error;
}
+/* The dlm_ls_start() that created the rv we take here may already have been
+ stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP
+ flag set. */
+
static void do_ls_recovery(struct dlm_ls *ls)
{
struct dlm_recover *rv = NULL;
@@ -226,7 +230,8 @@ static void do_ls_recovery(struct dlm_ls *ls)
spin_lock(&ls->ls_recover_lock);
rv = ls->ls_recover_args;
ls->ls_recover_args = NULL;
- clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
+ if (rv && ls->ls_recover_seq == rv->seq)
+ clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
spin_unlock(&ls->ls_recover_lock);
if (rv) {
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