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ocfs2: pending mastery asserts and migrations should block each other 

Use the existing structure for blocking migrations when ASTs are pending to
achieve the same result. If we can catch the assert before it goes on the
wire, just cancel it and let the migration continue.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Kurt Hackel 2006-05-01 13:32:27 -07:00 committed by Mark Fasheh
parent c87a9ae705
commit 36407488b1
1 changed files with 21 additions and 0 deletions
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21
fs/ocfs2/dlm/dlmmaster.c
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@ -2000,6 +2000,23 @@ static void dlm_assert_master_worker(struct dlm_work_item *item, void *data)
}
}
/*
* If we're migrating this lock to someone else, we are no
* longer allowed to assert out own mastery. OTOH, we need to
* prevent migration from starting while we're still asserting
* our dominance. The reserved ast delays migration.
*/
spin_lock(&res->spinlock);
if (res->state & DLM_LOCK_RES_MIGRATING) {
mlog(0, "Someone asked us to assert mastery, but we're "
"in the middle of migration. Skipping assert, "
"the new master will handle that.\n");
spin_unlock(&res->spinlock);
goto put;
} else
__dlm_lockres_reserve_ast(res);
spin_unlock(&res->spinlock);
/* this call now finishes out the nodemap
* even if one or more nodes die */
mlog(0, "worker about to master %.*s here, this=%u\n",
@ -2012,6 +2029,10 @@ static void dlm_assert_master_worker(struct dlm_work_item *item, void *data)
mlog_errno(ret);
}
/* Ok, we've asserted ourselves. Let's let migration start. */
dlm_lockres_release_ast(dlm, res);
put:
dlm_lockres_put(res);
mlog(0, "finished with dlm_assert_master_worker\n");