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ocfs2/dlm: do not insert a new mle when another process is already migrating

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When two processes are migrating the same lockres,
dlm_add_migration_mle() return -EEXIST, but insert a new mle in hash
list.  dlm_migrate_lockres() will detach the old mle and free the new
one which is already in hash list, that will destroy the list.

Signed-off-by: Jiufei Xue <xuejiufei@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
xuejiufei 2016-01-14 15:17:41 -08:00 committed by Linus Torvalds
parent bef5502de0
commit 32e493265b
1 changed files with 3 additions and 2 deletions
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5
fs/ocfs2/dlm/dlmmaster.c
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@ -2549,7 +2549,7 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
}
fail:
if (oldmle) {
if (ret != -EEXIST && oldmle) {
/* master is known, detach if not already detached */
dlm_mle_detach_hb_events(dlm, oldmle);
dlm_put_mle(oldmle);
@ -3136,7 +3136,8 @@ static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
mlog(0, "tried to migrate %.*s, but some "
"process beat me to it\n",
namelen, name);
ret = -EEXIST;
spin_unlock(&tmp->spinlock);
return -EEXIST;
} else {
/* bad. 2 NODES are trying to migrate! */
mlog(ML_ERROR, "migration error mle: "