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author | Sunil Mushran <sunil.mushran@oracle.com> | 2007-03-22 17:08:32 -0700 |
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committer | Mark Fasheh <mark.fasheh@oracle.com> | 2007-03-26 16:51:15 -0700 |
commit | 2f5bf1f2d061dea5146aa283685ce2b00cea2f3d (patch) | |
tree | c957d5e3567146470e1b439dd56ca87b74624424 /fs/ocfs2/dlm | |
parent | 78062cb2e54ffe0df811dce5e68b54da9b8c9025 (diff) | |
download | op-kernel-dev-2f5bf1f2d061dea5146aa283685ce2b00cea2f3d.zip op-kernel-dev-2f5bf1f2d061dea5146aa283685ce2b00cea2f3d.tar.gz |
ocfs2_dlm: Check for migrateable lockres in dlm_empty_lockres()
In dlm_migrate_lockres(), we check upfront whether the lockres is a
candidate for migration. This patch encapsulates that code in a separate
function so that dlm_empty_lockres() can also use it during umount. This
patch addresses the umount process spinning problem.
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/dlm')
-rw-r--r-- | fs/ocfs2/dlm/dlmdomain.c | 2 | ||||
-rw-r--r-- | fs/ocfs2/dlm/dlmmaster.c | 99 |
2 files changed, 67 insertions, 34 deletions
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c index dbbac18..c558442 100644 --- a/fs/ocfs2/dlm/dlmdomain.c +++ b/fs/ocfs2/dlm/dlmdomain.c @@ -657,6 +657,8 @@ void dlm_unregister_domain(struct dlm_ctxt *dlm) dlm_kick_thread(dlm, NULL); while (dlm_migrate_all_locks(dlm)) { + /* Give dlm_thread time to purge the lockres' */ + msleep(500); mlog(0, "%s: more migration to do\n", dlm->name); } dlm_mark_domain_leaving(dlm); diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c index 9229e04..6edffca 100644 --- a/fs/ocfs2/dlm/dlmmaster.c +++ b/fs/ocfs2/dlm/dlmmaster.c @@ -2424,6 +2424,57 @@ static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data) dlm_lockres_put(res); } +/* Checks whether the lockres can be migrated. Returns 0 if yes, < 0 + * if not. If 0, numlocks is set to the number of locks in the lockres. + */ +static int dlm_is_lockres_migrateable(struct dlm_ctxt *dlm, + struct dlm_lock_resource *res, + int *numlocks) +{ + int ret; + int i; + int count = 0; + struct list_head *queue, *iter; + struct dlm_lock *lock; + + assert_spin_locked(&res->spinlock); + + ret = -EINVAL; + if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { + mlog(0, "cannot migrate lockres with unknown owner!\n"); + goto leave; + } + + if (res->owner != dlm->node_num) { + mlog(0, "cannot migrate lockres this node doesn't own!\n"); + goto leave; + } + + ret = 0; + queue = &res->granted; + for (i = 0; i < 3; i++) { + list_for_each(iter, queue) { + lock = list_entry(iter, struct dlm_lock, list); + ++count; + if (lock->ml.node == dlm->node_num) { + mlog(0, "found a lock owned by this node still " + "on the %s queue! will not migrate this " + "lockres\n", (i == 0 ? "granted" : + (i == 1 ? "converting" : + "blocked"))); + ret = -ENOTEMPTY; + goto leave; + } + } + queue++; + } + + *numlocks = count; + mlog(0, "migrateable lockres having %d locks\n", *numlocks); + +leave: + return ret; +} /* * DLM_MIGRATE_LOCKRES @@ -2437,14 +2488,12 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle = NULL; struct dlm_master_list_entry *oldmle = NULL; struct dlm_migratable_lockres *mres = NULL; - int ret = -EINVAL; + int ret = 0; const char *name; unsigned int namelen; int mle_added = 0; - struct list_head *queue, *iter; - int i; - struct dlm_lock *lock; - int empty = 1, wake = 0; + int numlocks; + int wake = 0; if (!dlm_grab(dlm)) return -EINVAL; @@ -2458,42 +2507,16 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm, * ensure this lockres is a proper candidate for migration */ spin_lock(&res->spinlock); - if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) { - mlog(0, "cannot migrate lockres with unknown owner!\n"); - spin_unlock(&res->spinlock); - goto leave; - } - if (res->owner != dlm->node_num) { - mlog(0, "cannot migrate lockres this node doesn't own!\n"); + ret = dlm_is_lockres_migrateable(dlm, res, &numlocks); + if (ret < 0) { spin_unlock(&res->spinlock); goto leave; } - mlog(0, "checking queues...\n"); - queue = &res->granted; - for (i=0; i<3; i++) { - list_for_each(iter, queue) { - lock = list_entry (iter, struct dlm_lock, list); - empty = 0; - if (lock->ml.node == dlm->node_num) { - mlog(0, "found a lock owned by this node " - "still on the %s queue! will not " - "migrate this lockres\n", - i==0 ? "granted" : - (i==1 ? "converting" : "blocked")); - spin_unlock(&res->spinlock); - ret = -ENOTEMPTY; - goto leave; - } - } - queue++; - } - mlog(0, "all locks on this lockres are nonlocal. continuing\n"); spin_unlock(&res->spinlock); /* no work to do */ - if (empty) { + if (numlocks == 0) { mlog(0, "no locks were found on this lockres! done!\n"); - ret = 0; goto leave; } @@ -2729,6 +2752,7 @@ int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) { int ret; int lock_dropped = 0; + int numlocks; spin_lock(&res->spinlock); if (res->owner != dlm->node_num) { @@ -2740,6 +2764,13 @@ int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) spin_unlock(&res->spinlock); goto leave; } + + /* No need to migrate a lockres having no locks */ + ret = dlm_is_lockres_migrateable(dlm, res, &numlocks); + if (ret >= 0 && numlocks == 0) { + spin_unlock(&res->spinlock); + goto leave; + } spin_unlock(&res->spinlock); /* Wheee! Migrate lockres here! Will sleep so drop spinlock. */ |