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ocfs2/dlm: Take inflight reference count for remotely mastered resources too

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The inflight reference count, in the lock resource, is taken to pin the resource
in memory. We take it when a new resource is created and release it after a
lock is attached to it. We do this to prevent the resource from getting purged
prematurely.

Earlier this reference count was being taken for locally mastered resources
only. This patch extends the same functionality for remotely mastered ones.

We are doing this because the same premature purging could occur for remotely
mastered resources if the remote node were to die before completion of the
create lock.

Fix for Oracle bug#12405575.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
This commit is contained in:
Sunil Mushran
2011-07-24 10:29:54 -07:00
förälder ed8625c6fb
incheckning ff0a522e7d
3 ändrade filer med 34 tillägg och 41 borttagningar
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51
fs/ocfs2/dlm/dlmmaster.c
Visa fil

@@ -659,11 +659,8 @@ void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
{
assert_spin_locked(&res->spinlock);
if (!test_bit(dlm->node_num, res->refmap)) {
BUG_ON(res->inflight_locks != 0);
dlm_lockres_set_refmap_bit(dlm, res, dlm->node_num);
}
res->inflight_locks++;
mlog(0, "%s: res %.*s, inflight++: now %u, %ps()\n", dlm->name,
res->lockname.len, res->lockname.name, res->inflight_locks,
__builtin_return_address(0));
@@ -677,12 +674,11 @@ void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
BUG_ON(res->inflight_locks == 0);
res->inflight_locks--;
mlog(0, "%s: res %.*s, inflight--: now %u, %ps()\n", dlm->name,
res->lockname.len, res->lockname.name, res->inflight_locks,
__builtin_return_address(0));
if (res->inflight_locks == 0)
dlm_lockres_clear_refmap_bit(dlm, res, dlm->node_num);
wake_up(&res->wq);
}
@@ -716,7 +712,6 @@ struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
unsigned int hash;
int tries = 0;
int bit, wait_on_recovery = 0;
int drop_inflight_if_nonlocal = 0;
BUG_ON(!lockid);
@@ -728,36 +723,33 @@ lookup:
spin_lock(&dlm->spinlock);
tmpres = __dlm_lookup_lockres_full(dlm, lockid, namelen, hash);
if (tmpres) {
int dropping_ref = 0;
spin_unlock(&dlm->spinlock);
spin_lock(&tmpres->spinlock);
/* We wait for the other thread that is mastering the resource */
/* Wait on the thread that is mastering the resource */
if (tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
__dlm_wait_on_lockres(tmpres);
BUG_ON(tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN);
}
if (tmpres->owner == dlm->node_num) {
BUG_ON(tmpres->state & DLM_LOCK_RES_DROPPING_REF);
dlm_lockres_grab_inflight_ref(dlm, tmpres);
} else if (tmpres->state & DLM_LOCK_RES_DROPPING_REF)
dropping_ref = 1;
spin_unlock(&tmpres->spinlock);
/* wait until done messaging the master, drop our ref to allow
* the lockres to be purged, start over. */
if (dropping_ref) {
spin_lock(&tmpres->spinlock);
__dlm_wait_on_lockres_flags(tmpres, DLM_LOCK_RES_DROPPING_REF);
spin_unlock(&tmpres->spinlock);
dlm_lockres_put(tmpres);
tmpres = NULL;
goto lookup;
}
mlog(0, "found in hash!\n");
/* Wait on the resource purge to complete before continuing */
if (tmpres->state & DLM_LOCK_RES_DROPPING_REF) {
BUG_ON(tmpres->owner == dlm->node_num);
__dlm_wait_on_lockres_flags(tmpres,
DLM_LOCK_RES_DROPPING_REF);
spin_unlock(&tmpres->spinlock);
dlm_lockres_put(tmpres);
tmpres = NULL;
goto lookup;
}
/* Grab inflight ref to pin the resource */
dlm_lockres_grab_inflight_ref(dlm, tmpres);
spin_unlock(&tmpres->spinlock);
if (res)
dlm_lockres_put(res);
res = tmpres;
@@ -863,14 +855,11 @@ lookup:
/* finally add the lockres to its hash bucket */
__dlm_insert_lockres(dlm, res);
/* Grab inflight ref to pin the resource */
spin_lock(&res->spinlock);
dlm_lockres_grab_inflight_ref(dlm, res);
spin_unlock(&res->spinlock);
/* if this node does not become the master make sure to drop
* this inflight reference below */
drop_inflight_if_nonlocal = 1;
/* get an extra ref on the mle in case this is a BLOCK
* if so, the creator of the BLOCK may try to put the last
* ref at this time in the assert master handler, so we
@@ -973,8 +962,6 @@ wait:
wake_waiters:
spin_lock(&res->spinlock);
if (res->owner != dlm->node_num && drop_inflight_if_nonlocal)
dlm_lockres_drop_inflight_ref(dlm, res);
res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
spin_unlock(&res->spinlock);
wake_up(&res->wq);