From: xuejiufei Date: Tue, 15 Mar 2016 21:53:17 +0000 (-0700) Subject: ocfs2/dlm: return EINVAL when the lockres on migration target is in DROPPING_REF state X-Git-Tag: v4.6-rc1~137^2~109 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d277f33eda000ca03b1497fcf1c9e2ec33adf4c6;p=linux.git ocfs2/dlm: return EINVAL when the lockres on migration target is in DROPPING_REF state If master migrate this lock resource to node when it happened to purge it, a new lock resource will be created and inserted into hash list. If then master goes down, the lock resource being purged is recovered, so there exist two lock resource with different owner. So return error to master if the lock resource is in DROPPING state, master will retry to migrate this lock resource. Signed-off-by: xuejiufei Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Reviewed-by: Joseph Qi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c index 1eee96e25565..213279db3f28 100644 --- a/fs/ocfs2/dlm/dlmrecovery.c +++ b/fs/ocfs2/dlm/dlmrecovery.c @@ -1403,12 +1403,24 @@ int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data, * and RECOVERY flag changed when it completes. */ hash = dlm_lockid_hash(mres->lockname, mres->lockname_len); spin_lock(&dlm->spinlock); - res = __dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len, + res = __dlm_lookup_lockres_full(dlm, mres->lockname, mres->lockname_len, hash); if (res) { /* this will get a ref on res */ /* mark it as recovering/migrating and hash it */ spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_DROPPING_REF) { + mlog(0, "%s: node is attempting to migrate " + "lockres %.*s, but marked as dropping " + " ref!\n", dlm->name, + mres->lockname_len, mres->lockname); + ret = -EINVAL; + spin_unlock(&res->spinlock); + spin_unlock(&dlm->spinlock); + dlm_lockres_put(res); + goto leave; + } + if (mres->flags & DLM_MRES_RECOVERY) { res->state |= DLM_LOCK_RES_RECOVERING; } else {