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ocfs2_dlm: Fixes race between migrate and dirty

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dlmthread was removing lockres' from the dirty list
and resetting the dirty flag before shuffling the list.
This patch retains the dirty state flag until the lists
are shuffled.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Sunil Mushran <Sunil.Mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Kurt Hackel 2007-01-05 15:00:17 -08:00 committed by Mark Fasheh
parent faf0ec9f13
commit ddc09c8dda
3 changed files with 33 additions and 14 deletions
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1
fs/ocfs2/dlm/dlmcommon.h
View File

@ -223,6 +223,7 @@ static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
#define DLM_LOCK_RES_IN_PROGRESS 0x00000010
#define DLM_LOCK_RES_MIGRATING 0x00000020
#define DLM_LOCK_RES_DROPPING_REF 0x00000040
#define DLM_LOCK_RES_BLOCK_DIRTY 0x00001000
/* max milliseconds to wait to sync up a network failure with a node death */
#define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)

16
fs/ocfs2/dlm/dlmmaster.c
View File

@ -2707,8 +2707,15 @@ static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm,
__dlm_lockres_reserve_ast(res);
spin_unlock(&res->spinlock);
/* now flush all the pending asts.. hang out for a bit */
/* now flush all the pending asts */
dlm_kick_thread(dlm, res);
/* before waiting on DIRTY, block processes which may
* try to dirty the lockres before MIGRATING is set */
spin_lock(&res->spinlock);
BUG_ON(res->state & DLM_LOCK_RES_BLOCK_DIRTY);
res->state |= DLM_LOCK_RES_BLOCK_DIRTY;
spin_unlock(&res->spinlock);
/* now wait on any pending asts and the DIRTY state */
wait_event(dlm->ast_wq, !dlm_lockres_is_dirty(dlm, res));
dlm_lockres_release_ast(dlm, res);
@ -2734,6 +2741,13 @@ again:
mlog(0, "trying again...\n");
goto again;
}
/* now that we are sure the MIGRATING state is there, drop
* the unneded state which blocked threads trying to DIRTY */
spin_lock(&res->spinlock);
BUG_ON(!(res->state & DLM_LOCK_RES_BLOCK_DIRTY));
BUG_ON(!(res->state & DLM_LOCK_RES_MIGRATING));
res->state &= ~DLM_LOCK_RES_BLOCK_DIRTY;
spin_unlock(&res->spinlock);
/* did the target go down or die? */
spin_lock(&dlm->spinlock);

30
fs/ocfs2/dlm/dlmthread.c
View File

@ -95,7 +95,7 @@ int __dlm_lockres_has_locks(struct dlm_lock_resource *res)
int __dlm_lockres_unused(struct dlm_lock_resource *res)
{
if (!__dlm_lockres_has_locks(res) &&
list_empty(&res->dirty)) {
(list_empty(&res->dirty) && !(res->state & DLM_LOCK_RES_DIRTY))) {
/* try not to scan the bitmap unless the first two
* conditions are already true */
int bit = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
@ -455,12 +455,17 @@ void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
assert_spin_locked(&res->spinlock);
/* don't shuffle secondary queues */
if ((res->owner == dlm->node_num) &&
!(res->state & DLM_LOCK_RES_DIRTY)) {
/* ref for dirty_list */
dlm_lockres_get(res);
list_add_tail(&res->dirty, &dlm->dirty_list);
res->state |= DLM_LOCK_RES_DIRTY;
if ((res->owner == dlm->node_num)) {
if (res->state & (DLM_LOCK_RES_MIGRATING |
DLM_LOCK_RES_BLOCK_DIRTY))
return;
if (list_empty(&res->dirty)) {
/* ref for dirty_list */
dlm_lockres_get(res);
list_add_tail(&res->dirty, &dlm->dirty_list);
res->state |= DLM_LOCK_RES_DIRTY;
}
}
}
@ -639,7 +644,7 @@ static int dlm_thread(void *data)
dlm_lockres_get(res);
spin_lock(&res->spinlock);
res->state &= ~DLM_LOCK_RES_DIRTY;
/* We clear the DLM_LOCK_RES_DIRTY state once we shuffle lists below */
list_del_init(&res->dirty);
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
@ -663,10 +668,11 @@ static int dlm_thread(void *data)
/* it is now ok to move lockreses in these states
* to the dirty list, assuming that they will only be
* dirty for a short while. */
BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
if (res->state & (DLM_LOCK_RES_IN_PROGRESS |
DLM_LOCK_RES_MIGRATING |
DLM_LOCK_RES_RECOVERING)) {
/* move it to the tail and keep going */
res->state &= ~DLM_LOCK_RES_DIRTY;
spin_unlock(&res->spinlock);
mlog(0, "delaying list shuffling for in-"
"progress lockres %.*s, state=%d\n",
@ -687,6 +693,7 @@ static int dlm_thread(void *data)
/* called while holding lockres lock */
dlm_shuffle_lists(dlm, res);
res->state &= ~DLM_LOCK_RES_DIRTY;
spin_unlock(&res->spinlock);
dlm_lockres_calc_usage(dlm, res);
@ -697,11 +704,8 @@ in_progress:
/* if the lock was in-progress, stick
* it on the back of the list */
if (delay) {
/* ref for dirty_list */
dlm_lockres_get(res);
spin_lock(&res->spinlock);
list_add_tail(&res->dirty, &dlm->dirty_list);
res->state |= DLM_LOCK_RES_DIRTY;
__dlm_dirty_lockres(dlm, res);
spin_unlock(&res->spinlock);
}
dlm_lockres_put(res);